Release 2.12.7.5

Final cleanup for the calc version 2.12.7.5 release.
Fixed 0^(0) and 0^(6-6) to return 1
2025-08-19 01:13:27 +03:00 · 2021-02-03 03:24:47 -08:00 · 2021-02-03 01:44:17 -08:00 · 2021-02-03 00:51:56 -08:00 · 2021-02-02 23:45:34 -08:00 · 2021-02-02 23:42:05 -08:00
79 changed files with 1451 additions and 570 deletions
--- a/48
+++ b/48
@@ -80,6 +80,54 @@ Known bugs:
    The output of the alg_config.cal resource file is bogus.
    We would welcome a replacement for this code.

+    Calc shell scripts do not read from stdin properly,
+    we all as a number of the cscript examples.
+
+    The argv() function is behaving differently
+    when run in calc shell script mode:
+
+	When calc is run as:
+
+	    calc -s a bb ccc
+
+        and given this input on the command prompt:
+
+	    print "config(\"program\")=", config("program");
+	    print "argv()=", argv();
+	    argc = argv();
+	    for (i=0; i < argc; ++i) {
+		print "argv(":i:")=", argv(i);
+	    }
+
+	calc prints:
+
+	    config("program")= calc
+	    argv()= 3
+	    argv(0)= a
+	    argv(1)= bb
+	    argv(2)= ccc
+
+	but when it is run as a script called ./simple:
+
+	    #!/usr/local/bin/calc -q -s -f
+	    print "config(\"program\")=", config("program");
+	    print "argv()=", argv();
+	    argc = argv();
+	    for (i=0; i < argc; ++i) {
+		print "argv(":i:")=", argv(i);
+	    }
+
+	under Linux prints:
+
+	    config("program")= /usr/bin/calc
+	    argv()= 4
+	    argv(0)= ./simple
+	    argv(1)= a
+	    argv(2)= bb
+	    argv(3)= ccc
+
+	and under macOS simply enters into interactive mode.
+
    We are sure some more bugs exist.  When you find them, please let
    us know!  See the above for details on how to report and were to
    EMail your bug reports and hopefully patches to fix them.
--- a/207
+++ b/207
@@ -1,4 +1,209 @@
-The following are the changes from calc version 2.12.6.1 to date:
+The following are the changes from calc version 2.12.7.1 to date:
+
+    Corrected CHANGES notes that were mixed up for TAB, VT, CR &
+    NL.  The code in 2.12.7.0 is correct.  The CHANGE notes should
+    have read:
+
+	The following is a partial list of escape sequences recognized
+	in strings and in printf formats:
+
+	    \a	audible bell	byte 0x07 in ASCII encoding
+	    \b	backspace	byte 0x08 in ASCII encoding
+	    \f	form feed	byte 0x0c in ASCII encoding
+	    \n	newline		byte 0x0a in ASCII encoding
+	    \r	return		byte 0x0d in ASCII encoding
+	    \t	tab		byte 0x09 in ASCII encoding
+	    \v	vertical tab	byte 0x0b in ASCII encoding
+
+    Fixed a segfault when getpwuid() returned NULL during initialization.
+    Thanks goes to baratharon GitHub user for reporting this issue.
+
+    Requiring calc shell scripts to use -s -f at the end of the
+    initial #! line.
+
+    Fixed /tmp/mersenne example in calc(1) man page.
+
+    Added make variable ${ARCH_CFLAGS}.  The ${ARCH_CFLAGS} is
+    added after ${CCMISC} and before ${EXTRA_CFLAGS} when building
+    the ${CFLAGS} for compiling C code.  are ${CC} when compiling
+    C files.  The default value is:
+
+	ARCH_CFLAGS= -march=native
+
+    which directs C compiler to compile for the native machine.
+    To disable use of '-march=native', set ARCH_CFLAGS to the empty
+    string as in:
+
+	make all ARCH_CFLAGS=
+
+    To make calc RPMs more portable, they are compiled with an
+    empty ARCH_CFLAGS.
+
+    Fixed issues relating to compiling on macOS.  Fixed issues
+    where <unistd.h> is needed.
+
+    Fixed typos in help/intro and README.md. <<GitHub guilhermgonzaga>>
+
+    Copied missing description lines from help/intro to README.md
+    "What is calc?" section.  <<GitHub guilhermgonzaga>>
+
+    GCC 7 added a warning on fall throughs in case statements.  It's
+    enabled by -Wextra and treated as an error due to -Wall so it
+    breaks compilation.  See -Wimplicit-fallthrough in the GCC
+    manual.  The default value is 3, which means a comment matching
+    some specific regexes is enough to disable the warning.
+    Fixed spaces vs tabs and use FALLTHRU as it's used elsewhere.
+    Fixed one FALLTHRU comment that was inconsistent with others.
+    <<thanks jcul>>
+
+    Fixed minor typo on help/power. <<GitHub thegithubr>>
+
+    By default, the calc history file is located in ~/.calc_history.
+    Now, if the environment variable $CALCHISTFILE is defined
+    and is non-empty, then calc history file will be defined
+    by the $CALCHISTFILE environment variable.
+
+    Calc as defined 0^0 as 1.  However in the past, 0 raised to
+    an expression that evaluted to zero returned 1.  The result
+    was that 0^0 was different than 0^(6-6) or even 0^(0).
+    Now, calc will return 1 for 0^(0) and 0^zero when zero == 0.
+
+
+The following are the changes from calc version 2.12.6.10: to 2.12.7.0:
+
+    Added a patch to replaces the manual search for include files
+    in $(INCDIR) in the have_*.h targets with compiler invocations.
+    Thanks goes to Helmut Grohne (helmut at subdivi dot de) who
+    implemented the patch and posted it to the Debian bug tracker
+    and Martin Buck (m at rtin-buck dor de) for forwarding it to us.
+
+    The check_include make rule was fixed to not assume /usr/include.
+
+    The qprintnum() function now takes outdigits as a 3rd argument.
+    Most of the time, this 3rd argument is just conf->outdigits.
+    But when it comes to the experimental '%g', this value can
+    change.  This avoids having to modify conf->outdigits.
+
+    Fixed a problem where gcc complains about E_FUNC not being defined
+    for Linux systems as reported by Martin Buck (m at rtin-buck dor de).
+
+    Updated the help files help/config, help/display, help/epsilon,
+    help/fprint, help/printf, and help/strprintf to give more
+    examples of how display digits and epsilon precision interact
+    with displaying values.
+
+    Added more information about %g in the help file help/printf.
+
+    The '\a' is now recognized in a printf format string as the
+    single byte audible bell character (byte 0x07 in ASCII encoding).
+
+    The following is a partial list of escape sequences recognized
+    in strings and in printf formats:
+
+	\a	audible bell	byte 0x07 in ASCII encoding
+	\b	backspace	byte 0x08 in ASCII encoding
+	\f	form feed	byte 0x0c in ASCII encoding
+	\n	newline		byte 0x0a in ASCII encoding
+	\r	return		byte 0x0d in ASCII encoding
+	\t	tab		byte 0x09 in ASCII encoding
+	\v	vertical tab	byte 0x0b in ASCII encoding
+
+
+The following are the changes from calc version 2.12.6.9 to 2.12.6.9:
+
+    Fixed a number of core dump bugs related to the calculation of
+    tan(), cot(), sec(), csc(), tanh(), coth(), sech(), and csch(),
+    asin(), acos(), asinh(), acosh(), where when a call to an
+    underlying function produced an invalid value.  Thanks goes to
+    github user wuxiuheng for reporting this problem.
+
+    A number of trigonometric and hyperbolic functions that incorrectly
+    returned E_LOGINF, now return a new error code that is more
+    specific to the trigonometric or hyperbolic function.  The
+    following is a list of these new error codes: E_TAN3 E_TAN4
+    E_COT3 E_COT4 E_SEC3 E_CSC3 E_TANH3 E_TANH4 E_COTH3 E_COTH4
+    E_SECH3 E_CSCH3 E_ASIN3 E_ACOS3 E_ASINH3 E_ACOSH3 E_ATAN3 E_ACOT3
+    E_ASEC3 E_ACSC3 E_ATANH3 E_ACOTH3 E_ASECH3 E_ACSCH3.
+
+    Added regression tests 3729 thru 3732 to test E_TAN3, E_COT3,
+    E_SEC3 and E_CSC3 respectively.
+
+    Added experimential %g printf (and strprintf) format implementation
+    based on pull request from github user 10110111.
+
+    Made exterimental changes to macOS builds to not require use of
+    /usr/include.  The INCDIR for macOS uses:
+
+	INCDIR= $(shell xcrun --show-sdk-path --sdk macosx)/usr/include
+
+    to determine the upper path of the /usr/include directory for macOS.
+    In some rare cases, the Darwin target seems to not automatically detected.
+    If you are running under macOS, and that happens, you can force
+    the target to be Darwin:
+
+	# for macOS users only, force the target to be darwin
+	#
+	make target=Darwin clobber
+	make target=Darwin all
+	make target=Darwin chk
+	make target=Darwin install
+
+
+The following are the changes from calc version 2.12.6.6 to 2.12.6.8:
+
+    For historical purposes, in lucas.cal, gen_v1(1, n) always returns 4.
+
+    Fixed some compiler warnings, thanks to a report by Mike
+    <michael dot d dot ince at gmail dot com>.
+
+    Added work around for a gcc warning bug, thanks to a report by Mike
+    <michael dot d dot ince at gmail dot com>.
+
+    Fixed errors in various help files such as:
+
+	mat randbit seed srandom types
+
+    Removed the MAXSTRING symbol because it was no longer used by calc.
+
+    Increased HIST_SIZE (depth of the history stack) from 10k to 32k.
+
+    Increased TTYSIZE (reallocation size for terminal buffers) from 100 to 8191.
+
+    Increased MAXDEPTH (maximum depth of input stack) from 10 to 255.
+
+    Increased interactive input buffer size from 1024 to 256k.  This has the
+    effect of increasing the maximum length of an input line from a tty.
+    This helps with an interactive bug that was reported by Ruslan Kabatsayev
+    (b7 dot 10110111 at gmail dot com).
+
+    The calc man page indicates that -d also disables the printing of the
+    leading tilde.
+
+    Added information to "help command" about how to silence messages
+    while reading calc resource files.
+
+    Fixed an error message buffer overflow thanks to a report by
+    Frank Peters <nlp at northernlightsphoto dot biz>.
+
+    Replaced all use of the C funcion sprintf() with snprintf().
+    Replaced all use of the C funcion vsprintf() with vsnprintf().
+    Replaced all DONT_HAVE_VSPRINTF with DONT_HAVE_VSNPRINTF.
+    Replaced all Makefile var ${HAVE_VSPRINTF} with ${HAVE_VSNPRINTF}.
+
+
+The following are the changes from calc version 2.12.6.4 to 2.12.6.5:
+
+    Fixed warning about undefined operations involving the qlink(q)
+    macro by replacing that macro with an inline-function.  Thanks goes
+    to David Haller <dnh at opensuse dot org> for this fix.
+
+    NOTE for Windows 10 users: Pavel Nemec <pane at seznam dot cz>
+    reported that calc version 2.12.6.4 has been successfully
+    compiled, installed and running on Windows 10.  See README.WINDOWS
+    for more details.
+
+
+The following are the changes from calc version 2.12.6.1 to 2.12.6.3:

    Improved gen_v1(h,n) in lucas.cal to use an even faster search method.

--- a/HOWTO.INSTALL
+++ b/HOWTO.INSTALL
@@ -32,6 +32,16 @@ Installing calc from the bzip2-ed tarball in 4 easy steps:
 	targets, the default make is sufficent.  On FreeBSD for example,
 	one must use gmake instead of make.

+	Some report that under macOS, one has to declare the target
+	to be darwin.  So for macOS, one might have to do:
+
+	    # for macOS users only, force the target to be darwin
+	    #
+	    make target=Darwin clobber
+	    make target=Darwin all
+	    make target=Darwin chk
+	    make target=Darwin install
+
 	If your target system does not have GNU Make (or equivalent), then
 	you should try using the Makefile.simple and custom/Makefile.simple
 	files:
--- a/27
+++ b/27
@@ -207,30 +207,9 @@ all: fix_version check_include
 	${V} echo '=-=-=-=-= private Makefile $@ rule end =-=-=-=-='

 check_include:
-	$(Q) if [ ! -d /usr/include ]; then \
-	    echo "ERROR: critical directory missing: /usr/include" 1>&2; \
-	    echo "Without this critical directory, we cannot compile." 1>&2; \
-	    echo 1>&2; \
-	    echo "Perhaps your system isn't setup to compile C source?" 1>&2; \
-	    echo "For example, Apple OS X / darwin requres that XCode" 1>&2; \
-	    echo "must be installed and that you run the command:" 1>&2; \
-	    echo 1>&2; \
-	    echo "    xcode-select --install" 1>&2; \
-	    echo 1>&2; \
-	    exit 1; \
-	fi
-	$(Q) if [ ! -f /usr/include/stdio.h ]; then \
-	    echo "ERROR: critical include files are missing" 1>&2; \
-	    echo "Without this critical directory, we cannot compile." 1>&2; \
-	    echo 1>&2; \
-	    echo "Perhaps your system isn't setup to compile C source?" 1>&2; \
-	    echo "For example, Apple OS X / darwin requres that XCode" 1>&2; \
-	    echo "must be installed and that you run the command:" 1>&2; \
-	    echo 1>&2; \
-	    echo "    xcode-select --install" 1>&2; \
-	    echo 1>&2; \
-	    exit 1; \
-	fi
+	${V} echo '=-=-=-=-= private Makefile $@ rule start =-=-=-=-='
+	${Q} ${MAKE} ${XARG} -f ${MAKE_FILE} $@ ${XVAR}
+	${V} echo '=-=-=-=-= private Makefile $@ rule end =-=-=-=-='

 calc-dynamic-only:
 	${V} echo '=-=-=-=-= private Makefile $@ rule start =-=-=-=-='
--- a/Makefile.ship
+++ b/Makefile.ship
@@ -90,29 +90,29 @@ TERMCONTROL=
 #TERMCONTROL= -DUSE_SGTTY
 #TERMCONTROL= -DUSE_WIN32

-# If your system does not have a vsprintf() function, you could be in trouble.
+# If your system does not have a vsnprintf() function, you could be in trouble.
 #
-#	vsprintf(string, format, ap)
+#	vsnprintf(string, size, format, ap)
 #
-# This function works like sprintf except that the 3rd arg is a va_list
-# strarg (or varargs) list.  Some old systems do not have vsprintf().
-# If you do not have vsprintf(), then calc will try sprintf() and hope
+# This function works like spnrintf except that the 4th arg is a va_list
+# strarg (or varargs) list.  Some old systems do not have vsnprintf().
+# If you do not have vsnprintf(), then calc will try snprintf() and hope
 # for the best.
 #
 # A similar problem occurs if your system does not have a vsnprintf()
-# function.  This function is like the vsprintf() function except that
+# function.  This function is like the vsnprintf() function except that
 # there is an extra second argument that controls the maximum size
 # string that is produced.
 #
-# If HAVE_VSPRINTF is empty, this Makefile will run the have_stdvs.c and/or
-# have_varvs.c program to determine if vsprintf() is supported.  If
-# HAVE_VSPRINTF is set to -DDONT_HAVE_VSPRINTF then calc will hope that
-# sprintf() will work.
+# If HAVE_VSNPRINTF is empty, this Makefile will run the have_stdvs.c and/or
+# have_varvs.c program to determine if vsnprintf() is supported.  If
+# HAVE_VSNPRINTF is set to -DDONT_HAVE_VSNPRINTF then calc will hope that
+# snprintf() will work.
 #
-# If in doubt, leave HAVE_VSPRINTF empty.
+# If in doubt, leave HAVE_VSNPRINTF empty.
 #
-HAVE_VSPRINTF=
-#HAVE_VSPRINTF= -DDONT_HAVE_VSPRINTF
+HAVE_VSNPRINTF=
+#HAVE_VSNPRINTF= -DDONT_HAVE_VSNPRINTF

 # Determine the byte order of your machine
 #
@@ -575,7 +575,7 @@ HAVE_UNUSED=
 ifeq ($(target),Darwin)

 # default INCDIR for macOS
-INCDIR= /usr/local/include
+INCDIR= $(shell xcrun --show-sdk-path --sdk macosx)/usr/include

 else
 #endif	/* end of skip for non-Gnu makefiles */
@@ -1054,7 +1054,7 @@ EXT=

 # The default calc versions
 #
-VERSION= 2.12.6.4
+VERSION= 2.12.7.5

 # Names of shared libraries with versions
 #
@@ -1116,16 +1116,26 @@ STRIP= strip
 EXTRA_CFLAGS=
 EXTRA_LDFLAGS=

+# Architecture compile flags
+#
+# The ARCH_CFLAGS are ${CC} when compiling C files. They follow
+# CCMISC and preceed EXTRA_CFLAGS.
+#
+ARCH_CFLAGS= -march=native
+#ARCH_CFLAGS=
+
 # COMMON_CFLAGS are the common ${CC} flags used for all programs, both
 #	    intermediate and final calc and calc related programs
 #
 #if 0	/* start of skip for non-Gnu makefiles */
 ifdef ALLOW_CUSTOM
 #endif	/* end of skip for non-Gnu makefiles */
-COMMON_CFLAGS= -DCALC_SRC ${ALLOW_CUSTOM} ${CCWARN} ${CCMISC} ${EXTRA_CFLAGS}
+COMMON_CFLAGS= -DCALC_SRC ${ALLOW_CUSTOM} ${CCWARN} \
+    ${CCMISC} ${ARCH_CFLAGS} ${EXTRA_CFLAGS}
 #if 0	/* start of skip for non-Gnu makefiles */
 else
-COMMON_CFLAGS= -DCALC_SRC -UCUSTOM ${CCWARN} ${CCMISC} ${EXTRA_CFLAGS}
+COMMON_CFLAGS= -DCALC_SRC -UCUSTOM ${CCWARN} \
+    ${CCMISC} ${ARCH_CFLAGS} ${EXTRA_CFLAGS}
 endif
 #endif	/* end of skip for non-Gnu makefiles */

@@ -1900,6 +1910,7 @@ SAMPLE_OBJ= sample_many.o sample_rand.o
 CUSTOM_PASSDOWN=  \
    ALLOW_CUSTOM="${ALLOW_CUSTOM}" \
    AR=${AR} \
+    ARCH_CFLAGS=${ARCH_CFLAGS} \
    AWK=${AWK} \
    BINDIR="${BINDIR}" \
    BLD_TYPE="${BLD_TYPE}" \
@@ -2179,25 +2190,15 @@ TARGETS= ${EARLY_TARGETS} ${BLD_TYPE} ${LATE_TARGETS}
 all: check_include ${BLD_TYPE} CHANGES

 check_include:
-	$(Q) if [ ! -d /usr/include ]; then \
-	    echo "ERROR: critical directory missing: /usr/include" 1>&2; \
-	    echo "Without this critical directory, we cannot compile." 1>&2; \
-	    echo 1>&2; \
+	$(Q) if ! echo '#include <stdio.h>' | ${CC} -E - >/dev/null 2>&1; then \
+	    echo "ERROR: Missing critical <stdio.h> include file." 1>&2; \
+	    echo "Without critical include files, we cannot compile." 1>&2; \
 	    echo "Perhaps your system isn't setup to compile C source?" 1>&2; \
-	    echo "For example, Apple OS X / darwin requres that XCode" 1>&2; \
-	    echo "must be installed and that you run the command:" 1>&2; \
 	    echo 1>&2; \
-	    echo "    xcode-select --install" 1>&2; \
+	    echo "For example, Apple macOS / Darwin requres that XCode" 1>&2; \
+	    echo "must be installed." 1>&2; \
 	    echo 1>&2; \
-	    exit 1; \
-	fi
-	$(Q) if [ ! -f /usr/include/stdio.h ]; then \
-	    echo "ERROR: critical include files are missing" 1>&2; \
-	    echo "Without this critical directory, we cannot compile." 1>&2; \
-	    echo 1>&2; \
-	    echo "Perhaps your system isn't setup to compile C source?" 1>&2; \
-	    echo "For example, Apple OS X / darwin requres that XCode" 1>&2; \
-	    echo "must be installed and that you run the command:" 1>&2; \
+	    echo "Also macOS users might later to run this command:" 1>&2; \
 	    echo 1>&2; \
 	    echo "    xcode-select --install" 1>&2; \
 	    echo 1>&2; \
@@ -2477,22 +2478,15 @@ endian_calc.h: endian${EXT} ${MAKE_FILE}
 	${Q} echo '' >> endian_calc.h
 	${Q} echo '/* what byte order are we? */' >> endian_calc.h
 	-${Q} if [ X"${CALC_BYTE_ORDER}" = X ]; then \
-	    if [ -f ${INCDIR}/endian.h ]; then \
+	    if echo '#include <endian.h>' | ${CC} -E - >/dev/null 2>&1; then \
 		echo '#include <endian.h>' >> endian_calc.h; \
 		echo '#define CALC_BYTE_ORDER BYTE_ORDER' >> endian_calc.h; \
-	    elif [ -f ${INCDIR}/machine/endian.h ]; then \
+	    elif echo '#include <machine/endian.h>' | \
+		 ${CC} -E - >/dev/null 2>&1; then \
 		echo '#include <machine/endian.h>' >> endian_calc.h; \
 		echo '#define CALC_BYTE_ORDER BYTE_ORDER' >> endian_calc.h; \
-	    elif [ -f ${INCDIR}/sys/endian.h ]; then \
-		echo '#include <sys/endian.h>' >> endian_calc.h; \
-		echo '#define CALC_BYTE_ORDER BYTE_ORDER' >> endian_calc.h; \
-	    elif [ -f /usr/include/endian.h ]; then \
-		echo '#include <endian.h>' >> endian_calc.h; \
-		echo '#define CALC_BYTE_ORDER BYTE_ORDER' >> endian_calc.h; \
-	    elif [ -f /usr/include/machine/endian.h ]; then \
-		echo '#include <machine/endian.h>' >> endian_calc.h; \
-		echo '#define CALC_BYTE_ORDER BYTE_ORDER' >> endian_calc.h; \
-	    elif [ -f /usr/include/sys/endian.h ]; then \
+	    elif echo '#include <sys/endian.h>' | \
+		 ${CC} -E- >/dev/null 2>&1; then \
 		echo '#include <sys/endian.h>' >> endian_calc.h; \
 		echo '#define CALC_BYTE_ORDER BYTE_ORDER' >> endian_calc.h; \
 	    else \
@@ -2559,9 +2553,7 @@ have_times.h: ${MAKE_FILE}
 	    echo '#define HAVE_TIMES_H	/* yes */' >> have_times.h; \
 	elif [ X"${HAVE_TIMES_H}" = X"NO" ]; then \
 	    echo '#undef HAVE_TIMES_H  /* no */' >> have_times.h; \
-	elif [ -f ${INCDIR}/times.h ]; then \
-	    echo '#define HAVE_TIMES_H	/* yes */' >> have_times.h; \
-	elif [ -f /usr/include/times.h ]; then \
+	elif echo '#include <times.h>' | ${CC} -E - >/dev/null 2>&1; then \
 	    echo '#define HAVE_TIMES_H	/* yes */' >> have_times.h; \
 	else \
 	    echo '#undef HAVE_TIMES_H  /* no */' >> have_times.h; \
@@ -2570,9 +2562,7 @@ have_times.h: ${MAKE_FILE}
 	    echo '#define HAVE_SYS_TIMES_H	/* yes */' >> have_times.h; \
 	elif [ X"${HAVE_SYS_TIMES_H}" = X"NO" ]; then \
 	    echo '#undef HAVE_SYS_TIMES_H  /* no */' >> have_times.h; \
-	elif [ -f ${INCDIR}/sys/times.h ]; then \
-	    echo '#define HAVE_SYS_TIMES_H  /* yes */' >> have_times.h; \
-	elif [ -f /usr/include/sys/times.h ]; then \
+	elif echo '#include <sys/times.h>' | ${CC} -E - >/dev/null 2>&1; then \
 	    echo '#define HAVE_SYS_TIMES_H  /* yes */' >> have_times.h; \
 	else \
 	    echo '#undef HAVE_SYS_TIMES_H  /* no */' >> have_times.h; \
@@ -2581,9 +2571,7 @@ have_times.h: ${MAKE_FILE}
 	    echo '#define HAVE_TIME_H	/* yes */' >> have_times.h; \
 	elif [ X"${HAVE_TIME_H}" = X"NO" ]; then \
 	    echo '#undef HAVE_TIME_H  /* no */' >> have_times.h; \
-	elif [ -f ${INCDIR}/time.h ]; then \
-	    echo '#define HAVE_TIME_H  /* yes */' >> have_times.h; \
-	elif [ -f /usr/include/time.h ]; then \
+	elif echo '#include <time.h>' | ${CC} -E - >/dev/null 2>&1; then \
 	    echo '#define HAVE_TIME_H  /* yes */' >> have_times.h; \
 	else \
 	    echo '#undef HAVE_TIME_H  /* no */' >> have_times.h; \
@@ -2592,9 +2580,7 @@ have_times.h: ${MAKE_FILE}
 	    echo '#define HAVE_SYS_TIME_H	/* yes */' >> have_times.h; \
 	elif [ X"${HAVE_SYS_TIME_H}" = X"NO" ]; then \
 	    echo '#undef HAVE_SYS_TIME_H  /* no */' >> have_times.h; \
-	elif [ -f ${INCDIR}/sys/time.h ]; then \
-	    echo '#define HAVE_SYS_TIME_H  /* yes */' >> have_times.h; \
-	elif [ -f /usr/include/sys/time.h ]; then \
+	elif echo '#include <sys/time.h>' | ${CC} -E - >/dev/null 2>&1; then \
 	    echo '#define HAVE_SYS_TIME_H  /* yes */' >> have_times.h; \
 	else \
 	    echo '#undef HAVE_SYS_TIME_H  /* no */' >> have_times.h; \
@@ -2630,9 +2616,7 @@ have_stdlib.h: ${MAKE_FILE}
 	    echo '#define HAVE_STDLIB_H	/* yes */' >> have_stdlib.h; \
 	elif [ X"${HAVE_STDLIB_H}" = X"NO" ]; then \
 	    echo '#undef HAVE_STDLIB_H  /* no */' >> have_stdlib.h; \
-	elif [ -f ${INCDIR}/stdlib.h ]; then \
-	    echo '#define HAVE_STDLIB_H	 /* yes */' >> have_stdlib.h; \
-	elif [ -f /usr/include/stdlib.h ]; then \
+	elif echo '#include <stdlib.h>' | ${CC} -E - >/dev/null 2>&1; then \
 	    echo '#define HAVE_STDLIB_H	 /* yes */' >> have_stdlib.h; \
 	else \
 	    echo '#undef HAVE_STDLIB_H	/* no */' >> have_stdlib.h; \
@@ -2668,9 +2652,7 @@ have_unistd.h: ${MAKE_FILE}
 	    echo '#define HAVE_UNISTD_H	/* yes */' >> have_unistd.h; \
 	elif [ X"${HAVE_UNISTD_H}" = X"NO" ]; then \
 	    echo '#undef HAVE_UNISTD_H  /* no */' >> have_unistd.h; \
-	elif [ -f ${INCDIR}/unistd.h ]; then \
-	    echo '#define HAVE_UNISTD_H	 /* yes */' >> have_unistd.h; \
-	elif [ -f /usr/include/unistd.h ]; then \
+	elif echo '#include <unistd.h>' | ${CC} -E - >/dev/null 2>&1; then \
 	    echo '#define HAVE_UNISTD_H	 /* yes */' >> have_unistd.h; \
 	else \
 	    echo '#undef HAVE_UNISTD_H	/* no */' >> have_unistd.h; \
@@ -2706,9 +2688,7 @@ have_string.h: ${MAKE_FILE}
 	    echo '#define HAVE_STRING_H	/* yes */' >> have_string.h; \
 	elif [ X"${HAVE_STRING_H}" = X"NO" ]; then \
 	    echo '#undef HAVE_STRING_H  /* no */' >> have_string.h; \
-	elif [ -f ${INCDIR}/string.h ]; then \
-	    echo '#define HAVE_STRING_H	 /* yes */' >> have_string.h; \
-	elif [ -f /usr/include/string.h ]; then \
+	elif echo '#include <string.h>' | ${CC} -E - >/dev/null 2>&1; then \
 	    echo '#define HAVE_STRING_H	 /* yes */' >> have_string.h; \
 	else \
 	    echo '#undef HAVE_STRING_H	/* no */' >> have_string.h; \
@@ -2748,22 +2728,12 @@ terminal.h: ${MAKE_FILE}
 	    echo '#undef USE_TERMIOS   /* <termios.h> */' >> terminal.h; \
 	    echo '#undef USE_TERMIO    /* <termio.h> */' >> terminal.h; \
 	    echo '#undef USE_SGTTY     /* <sys/ioctl.h> */' >> terminal.h; \
-	elif [ -f ${INCDIR}/termios.h ]; then \
+	elif echo '#include <termios.h>' | ${CC} -E - >/dev/null 2>&1; then \
 	    echo '/* use termios */' >> terminal.h; \
 	    echo '#define USE_TERMIOS  /* <termios.h> */' >> terminal.h; \
 	    echo '#undef USE_TERMIO    /* <termio.h> */' >> terminal.h; \
 	    echo '#undef USE_SGTTY     /* <sys/ioctl.h> */' >> terminal.h; \
-	elif [ -f ${INCDIR}/termio.h ]; then \
-	    echo '/* use termio */' >> terminal.h; \
-	    echo '#undef USE_TERMIOS   /* <termios.h> */' >> terminal.h; \
-	    echo '#define USE_TERMIO   /* <termio.h> */' >> terminal.h; \
-	    echo '#undef USE_SGTTY     /* <sys/ioctl.h> */' >> terminal.h; \
-	elif [ -f /usr/include/termios.h ]; then \
-	    echo '/* use termios */' >> terminal.h; \
-	    echo '#define USE_TERMIOS  /* <termios.h> */' >> terminal.h; \
-	    echo '#undef USE_TERMIO    /* <termio.h> */' >> terminal.h; \
-	    echo '#undef USE_SGTTY     /* <sys/ioctl.h> */' >> terminal.h; \
-	elif [ -f /usr/include/termio.h ]; then \
+	elif echo '#include <termio.h>' | ${CC} -E - >/dev/null 2>&1; then \
 	    echo '/* use termio */' >> terminal.h; \
 	    echo '#undef USE_TERMIOS   /* <termios.h> */' >> terminal.h; \
 	    echo '#define USE_TERMIO   /* <termio.h> */' >> terminal.h; \
@@ -2955,7 +2925,7 @@ have_const.h: have_const.c ${MAKE_FILE}
 	    ${TRUE}; \
 	fi

-have_offscl.h: have_offscl.c ${MAKE_FILE}
+have_offscl.h: have_offscl.c have_unistd.h ${MAKE_FILE}
 	${Q} ${RM} -f offscl_tmp have_offscl.h
 	${Q} echo 'forming have_offscl.h'
 	${Q} echo '/*' > have_offscl.h
@@ -2995,7 +2965,7 @@ have_offscl.h: have_offscl.c ${MAKE_FILE}
 	    ${TRUE}; \
 	fi

-have_posscl.h: have_posscl.c have_fpos.h ${MAKE_FILE}
+have_posscl.h: have_posscl.c have_fpos.h have_unistd.h ${MAKE_FILE}
 	${Q} ${RM} -f have_posscl have_posscl.o posscl_tmp have_posscl.h
 	${Q} echo 'forming have_posscl.h'
 	${Q} echo '/*' > have_posscl.h
@@ -3251,7 +3221,7 @@ have_ustat.h: have_ustat.c ${MAKE_FILE}
 	    ${TRUE}; \
 	fi

-have_getsid.h: have_getsid.c ${MAKE_FILE}
+have_getsid.h: have_getsid.c have_unistd.h ${MAKE_FILE}
 	${Q} ${RM} -f getsid_tmp have_getsid.h
 	${Q} echo 'forming have_getsid.h'
 	${Q} echo '/*' > have_getsid.h
@@ -3291,7 +3261,7 @@ have_getsid.h: have_getsid.c ${MAKE_FILE}
 	    ${TRUE}; \
 	fi

-have_getpgid.h: have_getpgid.c ${MAKE_FILE}
+have_getpgid.h: have_getpgid.c have_unistd.h ${MAKE_FILE}
 	${Q} ${RM} -f getpgid_tmp have_getpgid.h
 	${Q} echo 'forming have_getpgid.h'
 	${Q} echo '/*' > have_getpgid.h
@@ -3373,7 +3343,7 @@ have_gettime.h: have_gettime.c ${MAKE_FILE}
 	    ${TRUE}; \
 	fi

-have_getprid.h: have_getprid.c ${MAKE_FILE}
+have_getprid.h: have_getprid.c have_unistd.h ${MAKE_FILE}
 	${Q} ${RM} -f getprid_tmp have_getprid.h
 	${Q} echo 'forming have_getprid.h'
 	${Q} echo '/*' > have_getprid.h
@@ -3545,7 +3515,7 @@ args.h: have_stdvs.c have_varvs.c have_string.h have_unistd.h have_string.h
 	${Q} echo '' >> args.h
 	${Q} echo '' >> args.h
 	${Q} ${RM} -f have_stdvs.o have_stdvs${EXT}
-	-${Q} ${LCC} ${ICFLAGS} ${HAVE_VSPRINTF} have_stdvs.c -c \
+	-${Q} ${LCC} ${ICFLAGS} ${HAVE_VSNPRINTF} have_stdvs.c -c \
 		>/dev/null 2>&1; ${TRUE}
 	-${Q} ${LCC} ${ILDFLAGS} have_stdvs.o -o have_stdvs${EXT} \
 	    >/dev/null 2>&1; ${TRUE}
@@ -3554,10 +3524,10 @@ args.h: have_stdvs.c have_varvs.c have_string.h have_unistd.h have_string.h
 	else \
 	    ${TRUE}; \
 	fi
-	-${Q} if [ ! -f have_args.sh ] && [ X"${HAVE_VSPRINTF}" = X ]; then \
+	-${Q} if [ ! -f have_args.sh ] && [ X"${HAVE_VSNPRINTF}" = X ]; then \
 	    ${RM} -f have_stdvs.o have_stdvs${EXT} have_varvs.o; \
 	    ${RM} -f have_varvs${EXT}; \
-	    ${LCC} ${ICFLAGS} ${HAVE_VSPRINTF} have_varvs.c -c \
+	    ${LCC} ${ICFLAGS} ${HAVE_VSNPRINTF} have_varvs.c -c \
 		    2>/dev/null; \
 	    ${LCC} ${ILDFLAGS} have_varvs.o -o have_varvs${EXT} 2>/dev/null; \
 	    if ./have_varvs${EXT} >>args.h 2>/dev/null; then \
@@ -3573,8 +3543,8 @@ args.h: have_stdvs.c have_varvs.c have_string.h have_unistd.h have_string.h
 	else \
 	    echo 'exit 1' > have_args.sh; \
 	    echo "Unable to determine what type of variable args and"; \
-	    echo "what type of vsprintf() should be used.  Set or change"; \
-	    echo "the Makefile variable HAVE_VSPRINTF."; \
+	    echo "what type of vsnprintf() should be used.  Set or change"; \
+	    echo "the Makefile variable HAVE_VSNPRINTF."; \
 	fi
 	${Q} sh ./have_args.sh
 	${Q} echo '' >> args.h
@@ -4082,6 +4052,7 @@ env:
 	@echo 'ALIGN32=${ALIGN32}'; echo ''
 	@echo 'ALLOW_CUSTOM=${ALLOW_CUSTOM}'; echo ''
 	@echo 'AR=${AR}'; echo ''
+	@echo 'ARCH_CFLAGS=${ARCH_CFLAGS}'; echo ''
 	@echo 'AWK=${AWK}'; echo ''
 	@echo 'BINDIR=${BINDIR}'; echo ''
 	@echo 'BLD_TYPE=${BLD_TYPE}'; echo ''
@@ -4160,7 +4131,7 @@ env:
 	@echo 'HAVE_UNUSED=${HAVE_UNUSED}'; echo ''
 	@echo 'HAVE_URANDOM_H=${HAVE_URANDOM_H}'; echo ''
 	@echo 'HAVE_USTAT=${HAVE_USTAT}'; echo ''
-	@echo 'HAVE_VSPRINTF=${HAVE_VSPRINTF}'; echo ''
+	@echo 'HAVE_VSNPRINTF=${HAVE_VSNPRINTF}'; echo ''
 	@echo 'HELPDIR=${HELPDIR}'; echo ''
 	@echo 'HELP_PASSDOWN=${HELP_PASSDOWN}'; echo ''
 	@echo 'H_SRC=${H_SRC}'; echo ''
@@ -5504,6 +5475,7 @@ hist.o: have_unistd.h
 hist.o: have_unused.h
 hist.o: hist.c
 hist.o: hist.h
+hist.o: lib_calc.h
 hist.o: longbits.h
 hist.o: nametype.h
 hist.o: qmath.h
--- a/README.WINDOWS
+++ b/README.WINDOWS
@@ -10,6 +10,21 @@ NOTE: The main developers do not have access to a Windoz based platform.
      Of course you are welcome to send us any patches that fix your
      Windoz build environment.

+
+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
+=-= compiling with Windows Subsystem for Linux (WSL) =-Cygwin =-=
+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
+
+It has been reported that calc version 2.12.6.4 has been successfully
+compiled, installed and running on Windows 10 on 2018 Jan 21.
+
+We were told:
+
+  "The Windows Subsystem for Linux (WSL) is a new Windows 10 feature that
+   enables you to run native Linux command-line tools directly on Windows"
+
+   https://docs.microsoft.com/cs-cz/windows/wsl/about
+
 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=
 =-= compiling with Cygwin =-=
 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=
--- a/README.md
+++ b/README.md
@@ -1,6 +1,9 @@
 # What is calc?

 Calc is an interactive calculator which provides for easy large
+numeric calculations, but which also can be easily programmed
+for difficult or long calculations.	 It can accept a command line
+argument, in which case it executes that single command and exits.
 Otherwise, it enters interactive mode.  In this mode, it accepts
 commands one at a time, processes them, and displays the answers.
 In the simplest case, commands are simply expressions which are
@@ -16,7 +19,7 @@ and the calculator will print:
 15
 ```

-Calc as the usual collection of arithmetic operators +, -, /, * as
+Calc has the usual collection of arithmetic operators +, -, /, * as
 well as ^ (exponentiation), % (modulus) and // (integer divide).
 For example:

--- a/cal/lucas.cal
+++ b/cal/lucas.cal
@@ -1,7 +1,7 @@
 /*
 * lucas - perform a Lucas primality test on h*2^n-1
 *
- * Copyright (C) 1999,2017  Landon Curt Noll
+ * Copyright (C) 1999,2017,2018  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -373,41 +373,53 @@ lucas(h, n)
 		return 1;		/* 239 is prime */
 	}

+	/*
+	 * Verify that h*2^n-1 is not a multiple of 3
+	 *
+	 * The case for h*2^n-1 == 3 is handled above.
+	 */
+	if (((h % 3 == 1) && (n % 2 == 0)) || ((h % 3 == 2) && (n % 2 == 1))) {
+		/* no need to test h*2^n-1, it is a multiple of 3 */
+		ldebug("lucas","not-prime: != 3 and is a multiple of 3");
+		return 0;
+	}
+
 	/*
 	 * Avoid any numbers divisible by small primes
 	 */
 	/*
-	 * check for 3 <= prime factors < 29
-	 * pfact(28)/2 = 111546435
+	 * check for 5 <= prime factors < 31
+	 * pfact(30)/6 = 1078282205
 	 */
 	testval = h*2^n - 1;
-	if (gcd(testval, 111546435) > 1) {
-		/* a small 3 <= prime < 29 divides h*2^n-1 */
-		ldebug("lucas","not-prime: 3<=prime<29 divides h*2^n-1");
+	if (gcd(testval, 1078282205) > 1) {
+		/* a small 5 <= prime < 31 divides h*2^n-1 */
+		ldebug("lucas",\
+		    "not-prime: a small 5<=prime<31 divides h*2^n-1");
 		return 0;
 	}
 	/*
-	 * check for 29 <= prime factors < 47
-	 * pfact(46)/pfact(28) = 5864229
+	 * check for 31 <= prime factors < 53
+	 * pfact(52)/pfact(30) = 95041567
 	 */
-	if (gcd(testval, 58642669) > 1) {
-		/* a small 29 <= prime < 47 divides h*2^n-1 */
-		ldebug("lucas","not-prime: 29<=prime<47 divides h*2^n-1");
+	if (gcd(testval, 95041567) > 1) {
+		/* a small 31 <= prime < 53 divides h*2^n-1 */
+		ldebug("lucas","not-prime: 31<=prime<53 divides h*2^n-1");
 		return 0;
 	}
 	/*
-	 * check for prime 47 <= factors < 257, if h*2^n-1 is large
-	 * 2^282 > pfact(256)/pfact(46) > 2^281
+	 * check for prime 53 <= factors < 257, if h*2^n-1 is large
+	 * 2^276 > pfact(256)/pfact(52) > 2^275
 	 */
 	bits = highbit(testval);
-	if (bits >= 281) {
+	if (bits >= 275) {
 		if (pprod256 <= 0) {
-			pprod256 = pfact(256)/pfact(46);
+			pprod256 = pfact(256)/pfact(52);
 		}
 		if (gcd(testval, pprod256) > 1) {
-			/* a small 47 <= prime < 257 divides h*2^n-1 */
+			/* a small 53 <= prime < 257 divides h*2^n-1 */
 			ldebug("lucas",\
-			    "not-prime: 47<=prime<257 divides h*2^n-1");
+			    "not-prime: 53<=prime<257 divides h*2^n-1");
 			return 0;
 		}
 	}
@@ -423,7 +435,9 @@ lucas(h, n)
 	 * generate a test for h*2^n-1.	 The legacy function,
 	 * legacy_gen_v1() used by the Amdahl 6 could have returned
 	 * -1. The new gen_v1() based on the method outlined in Ref4
-	 * will never return -1.
+	 * will never return -1 if h*2^n-1 is not a multiple of 3.
+	 * Because the "multiple of 3" case is handled above, the
+	 * call below to gen_v1() will never return -1.
 	 */
 	v1 = gen_v1(h, n);
 	if (v1 < 0) {
@@ -1172,6 +1186,26 @@ gen_v1(h, n)
 		return -1;
 	}

+	/*
+	 * Common Mersenne number case:
+	 *
+	 * For Mersenne numbers:
+	 *
+	 *	2^n-1
+	 *
+	 * we can use, 40% of the time, v(1) == 3.  However nearly all code that
+	 * implements the Lucas-Lehmer test uses v(1) == 4.  Whenever for
+	 * h != 0 mod 3, and particular the Mersenne number case of when h == 1:
+	 *
+	 *	1*2^n-1
+	 *
+	 * v(1) == 4 always works.  For this reason, we return 4 when h == 1.
+	 */
+	if (h == 1) {
+		/* v(1) == 4 always works for the Mersenne number case */
+		return 4;
+	}
+
 	/*
 	 * check for Case 1:      (h mod 3 != 0)
 	 */
--- a/cal/regress.cal
+++ b/cal/regress.cal
@@ -3227,9 +3227,9 @@ define test_error()

 	print '3600: Beginning test_error';

-	/* bump ecnt up by 148 */
-	ecnt += 148;
-	print				'3601: ecnt += 148';
+	/* bump ecnt up by 156 */
+	ecnt += 156;
+	print				'3601: ecnt += 156';

 	strx = "x";
 	print				'3602: strx = "x"';
@@ -3418,11 +3418,15 @@ define test_error()
 	n = 8191;
 	print				'3727: n = 8191';
 	/* test 3728 removed due to non-portable strerror() output */
+	vrfy(tan(2e9i) == error(10435),	'3729: tan(2e9i) == error(10435)');
+	vrfy(cot(2e9i) == error(10437),	'3730: cot(2e9i) == error(10437)');
+	vrfy(sec(2e9i) == error(10439),	'3731: sec(2e9i) == error(10439)');
+	vrfy(csc(2e9i) == error(10440),	'3732: csc(2e9i) == error(10440)');

 	/* errmax and errcount should be bumped up the 148 errors above */
-	vrfy(errcount() == ecnt,	'3729: errcount() == ecnt');
+	vrfy(errcount() == ecnt,	'3733: errcount() == ecnt');

-	print '3730: Ending test_error';
+	print '3734: Ending test_error';
 }
 print '054: parsed test_error()';

@@ -4102,38 +4106,46 @@ define test_strprintf()
 			'4821: strprintf("%b", 27/29) == "0b11011/0b11101"');
 	vrfy(strprintf("%e", 12345) == "~1.23e4",
 			'4822: strprintf("%e", 12345) == "~1.23e4"');
+	vrfy(strprintf("%g", .385) == "~.38",
+			'4823: strprintf("%g", .385) == "~.38"');
+	vrfy(strprintf("%g", 385) == "~3.8e2",
+			'4824: strprintf("%g", 385) == "~3.8e2"');

 	/* mode tests with tilde == 0 */
 	c = config("tilde", 0);
-	print		'4823: c = config("tilde", 0)';
+	print		'4825: c = config("tilde", 0)';
 	vrfy(strprintf("%e", 12345) == "1.23e4",
-			'4824: strprintf("%e", 12345) == "1.23e4"');
+			'4826: strprintf("%e", 12345) == "1.23e4"');
 	vrfy(strprintf("%.3e", 12345) == "1.234e4",
-			'4825: strprintf("%.3e", 12345) == "1.234e4"');
+			'4827: strprintf("%.3e", 12345) == "1.234e4"');
 	vrfy(strprintf("%e", .00012345) == "1.23e-4",
-			'4826: strprintf("%e", .00012345) == "1.23e-4"');
+			'4828: strprintf("%e", .00012345) == "1.23e-4"');
 	vrfy(strprintf("%d %d", 27) == "27 ",
-			'4827: strprintf("%d %d", 27) == "27 "');
+			'4829: strprintf("%d %d", 27) == "27 "');
 	vrfy(strprintf("%d", 27, 29) == "27",
-			'4828: strprintf("%d", 27, 29) == "27"');
+			'4830: strprintf("%d", 27, 29) == "27"');
 	vrfy(strprintf("%r = %f", 27/29, 27/29) == "27/29 = .93",
-		'4829: strprintf("%r = %f", 27/29, 27/29) == "27/29 = .93"');
+		'4831: strprintf("%r = %f", 27/29, 27/29) == "27/29 = .93"');
 	vrfy(strprintf("%s", "abc") == "abc",
-		'4830: strprintf("%s", "abc") == "abc"');
+		'4832: strprintf("%s", "abc") == "abc"');
 	vrfy(strprintf("%f", "abc") == "abc",
-		'4831: strprintf("%f", "abc") == "abc"');
+		'4833: strprintf("%f", "abc") == "abc"');
 	vrfy(strprintf("%e", "abc") == "abc",
-		'4832: strprintf("%e", "abc") == "abc"');
+		'4834: strprintf("%e", "abc") == "abc"');
 	vrfy(strprintf("%5s", "abc") == "  abc",
-		'4833: strprintf("%5s", "abc") == "  abc"');
+		'4835: strprintf("%5s", "abc") == "  abc"');
 	vrfy(strprintf("%-5s", "abc") == "abc  ",
-		'4834: strprintf("%-5s", "abc") == "abc	 "');
+		'4836: strprintf("%-5s", "abc") == "abc	 "');
+	vrfy(strprintf("%g", .385) == ".38",
+			'4837: strprintf("%g", .385) == ".38"');
+	vrfy(strprintf("%g", 385) == "3.8e2",
+			'4838: strprintf("%g", 385) == "3.8e2"');

 	/* restore config */
 	c = config("all", callcfg);
-	print				    '4835: c = config("all", callcfg)';
+	print				    '4839: c = config("all", callcfg)';

-	print '4836: Ending test_strprintf';
+	print '4840: Ending test_strprintf';
 }
 print '088: parsed test_fileop()';

@@ -7932,8 +7944,8 @@ print '8901: read -once "test8900"';
 read -once "test8900";
 print '8902: about to run test8900(1,,8903)';
 testnum = test8900(1,,8903);
-print '8999: ecnt = 203;'
-ecnt = 203;
+print '8999: ecnt = 211;'
+ecnt = 211;
 /* 89xx: test calc resource functions by Christoph Zurnieden */


--- a/cal/test8900.cal
+++ b/cal/test8900.cal
@@ -2057,7 +2057,12 @@ define t010()
 	epsilon(eps);
 	return 5;
    }
-    if ((stirling2(10, 5) - (42525)) != 0) {
+    /*
+     * Once, when an expression such as 0^(6-6) returned 0,
+     * then stirling2(10, 5) == 42525.  However when we made9
+     * 0^(6-6) == 0^0 == 1, then stirling2(10, 5) == 5102999/120.
+     */
+    if ((stirling2(10, 5) - (5102999/120)) != 0) {
 	epsilon(eps);
 	return 6;
    }
--- a/calc.c
+++ b/calc.c
@@ -104,6 +104,8 @@ main(int argc, char **argv)
 	int c;			/* option */
 	int index;
 	int maxindex;
+	/* fix gcc warning bug */
+	int unusedint = 0;
 	char *cp;
 	char *endcp;
 	char *bp;
@@ -278,7 +280,9 @@ main(int argc, char **argv)
 						    exit(6);
 						}
 						calc_debug = cp;
-						(void) strtol(cp, &endcp, 10);
+						/* fix gcc warning bug */
+						unusedint =
+						    strtol(cp, &endcp, 10);
 						cp = endcp;
 						if (*cp != '\0' &&
 						    *cp != ' ' && *cp != ':') {
@@ -310,7 +314,9 @@ main(int argc, char **argv)
 						    exit(9);
 						}
 						resource_debug = cp;
-						(void) strtol(cp, &endcp, 10);
+						/* fix gcc warning bug */
+						unusedint =
+						    strtol(cp, &endcp, 10);
 						cp = endcp;
 						if (*cp != '\0' &&
 						    *cp != ' ' && *cp != ':') {
@@ -340,7 +346,8 @@ main(int argc, char **argv)
 					    exit(12);
 					}
 					user_debug = cp;
-					(void) strtol(cp, &endcp, 10);
+					/* unusedint avoids gcc warning bug */
+					unusedint = strtol(cp, &endcp, 10);
 					cp = endcp;
 					if (*cp != '\0' && *cp != ' ') {
 						fprintf(stderr, "Bad syntax in"
@@ -442,7 +449,7 @@ main(int argc, char **argv)
 		"\t[-O] [-p] [-q] [-s] [-u] [-v] "
 		"[--] [calc_cmd ...]\n"
 		"usage: %s ... -f filename\n"
-		"1st cscript line: #/path/to/calc ... -f\n",
+		"1st cscript line: #/path/to/calc ... -s -f\n",
 		program, program);
 					exit(20);
 			}
@@ -721,8 +728,10 @@ main(int argc, char **argv)
 		printf("main: run_state = %s\n", run_state_name(run_state));

 	/*
-	 * all done
+	 * All done! - Jessica Noll, Age 2
 	 */
+	/* fix gcc warning bug */
+	unusedint++;
 	libcalc_call_me_last();
 	return (run_state == RUN_EXIT_WITH_ERROR ||
 		run_state == RUN_ZERO) ? 1 : 0;
@@ -766,7 +775,7 @@ calc_interrupt(char *fmt, ...)
 	va_start(ap, fmt);
 	vsnprintf(calc_err_msg, MAXERROR, fmt, ap);
 	va_end(ap);
-	calc_err_msg[MAXERROR] = '\0';
+	calc_err_msg[MAXERROR] = '\0';	/* paranoia */
 	fprintf(stderr, "%s\n\n", calc_err_msg);
 	funcname = NULL;
 	if (calc_use_scanerr_jmpbuf != 0) {
--- a/calc.h
+++ b/calc.h
@@ -48,6 +48,7 @@
 #define HOME		"HOME"		/* environment variable for home dir */
 #define PAGER		"PAGER"		/* environment variable for help */
 #define SHELL		"SHELL"		/* environment variable for shell */
+#define CALCHISTFILE	"CALCHISTFILE"	/* history file environment variable */
 #define DEFAULTCALCBINDINGS "bindings"	/* default calc bindings file */
 #define DEFAULTCALCHELP "help"		/* help file that -h prints */
 #define DEFAULTSHELL	"sh"		/* default shell to use */
@@ -65,7 +66,6 @@

 #define SYMBOLSIZE	256	/* maximum symbol name size */
 #define MAXLABELS	100	/* maximum number of user labels in function */
-#define MAXSTRING	1024	/* maximum size of string constant */
 #define MAXSTACK	2048	/* maximum depth of evaluation stack */
 #define MAXFILES	20	/* maximum number of opened files */
 #define PROMPT1		"> "	/* default normal prompt*/
--- a/calc.man
+++ b/calc.man
@@ -1,5 +1,5 @@
 .\"
-.\" Copyright (C) 1999-2007,2014	Landon Curt Noll
+.\" Copyright (C) 1999-2007,2014,2018,2021	Landon Curt Noll
 .\"
 .\" Calc is open software; you can redistribute it and/or modify it under
 .\" the terms of the version 2.1 of the GNU Lesser General Public License
@@ -50,7 +50,7 @@ calc \- arbitrary precision calculator
 .RB [ [\-\-]\ calc_cmd\ \&.\|.\|. ]
 .in -5n
 .sp
-\fI#!${BINDIR}/calc\fP\ [other_flags\ \&...] \fB\-f\fP
+\fI#!${BINDIR}/calc\fP\ [other_flags\ \&...] \fB\-s\fP \fB\-f\fP
 .SH DESCRIPTION
 \&
 .br
@@ -138,7 +138,7 @@ calc -d "read qtime; qtime(2)"
 .fi
 .in -5n
 .sp 1
-will just say:
+will just print:
 .sp 1
 .in +5n
 .nf
@@ -148,6 +148,41 @@ It's nearly ten past six.
 .sp 1
 This flag disables the reporting of missing calc
 startup resource files.
+.sp 1
+
+This flag also disables the printing the leading tilde. For example:
+.sp 1
+.in +5n
+.nf
+calc 2/3
+.fi
+.in -5n
+.sp 1
+will print:
+.sp 1
+.in +5n
+.nf
+~0.66666666666666666667
+.fi
+.in -5n
+.sp 1
+.sp 1
+whereas:
+.sp 1
+.in +5n
+.nf
+calc -d 2/3
+.fi
+.in -5n
+.sp 1
+will just print:
+.sp 1
+.in +5n
+.nf
+0.66666666666666666667
+.fi
+.in -5n
+.sp 1

 .TP
 .BR -D " calc_debug[:resource_debug[:user_debug]]"
@@ -184,24 +219,29 @@ The getenv() builtin will still return values, however.

 .TP
 .B \-f
+This flag is normally only with calc shell scripts.
+.sp 1
 This flag is required when using calc in
 .BR "shell script mode" .
 It must be at the end of the initial
 .B #!
-line of the script.
+line of the script
+and must be immedately preceeded by the
+.B \-s
+flag.
 .sp 1
-This flag is normally only at the end of a calc shell script.
 If the first line of an executable file begins
 .B #!
 followed by the absolute pathname of the
 .B calc
-program and the flag
+program and if the first line ends with the two flags
+.B \-s
 .B \-f
 as in:
 .sp 1
 .in +5n
 .nf
-\fI#!${BINDIR}/calc\fP\ [other_flags\ \&...] \fB\-f\fP
+\fI#!${BINDIR}/calc\fP\ [other_flags\ \&...] \fB\-s\fP \fB\-f\fP
 .fi
 .in -5n
 .sp 1
@@ -235,7 +275,7 @@ on the command line:
 .sp 1
 .in +5n
 .nf
-\fIcalc\fP\ [other_flags\ \&...] \fB\-f\fP filename
+\fIcalc\fP\ [other_flags\ \&...] \fB\-s\fP \fB\-f\fP filename
 .fi
 .in -5n
 .sp 1
@@ -248,6 +288,16 @@ Use of
 .B \-f
 implies
 .BR \-s .
+However in a calc shell script,
+one must include
+.B \-f
+before
+.B \-s
+on the initial
+.B #!
+line.
+
+.sp 1
 In addition,
 .B \-d
 and
@@ -718,25 +768,28 @@ If the first line of an executable file begins
 .B #!
 followed by the absolute pathname of the
 .B calc
-program and the flag
+program and the first line ends with the two flags
+.B \-s
 .B \-f
 as in:
 .sp 1
 .in +5n
 .nf
-\fI#!${BINDIR}/calc\fP\ [other_flags\ \&...] \fB\-f\fP
+\fI#!${BINDIR}/calc\fP\ [other_flags\ \&...] \fB\-s\fP \fB\-f\fP
 .fi
 .in -5n
 .sp 1
 the rest of the file will be processed in
 .BR "shell script mode" .
 Note that
+.B \-s
 .B \-f
 must at the end of the initial ``#!'' line.
 Any other optional
 .B "other_flags"
 must come before
 the
+.B \-s
 .BR \-f .
 .sp 1
 In
@@ -768,18 +821,26 @@ the file
 .sp 1
 .in +5n
 .nf
-\fI#!${BINDIR}/calc\fP\ \&\fB\-q\fP \fB\-f\fP
-#
-# mersenne - an example of a calc \fBshell script file\fP
+\fI#!${BINDIR}/calc\fP\ \&\fB\-q\fP \&\fB\-s\fP \fB\-f\fP
+
+/* setup */
+argc = argv();
+program = argv(0);
+stderr = files(2);

 /* parse args */
-if (argv() != 1) {
-    fprintf(files(2), "usage: %s exp\\n", config("program"));
+if (argc != 2) {
+    fprintf(stderr, "usage: %s exp\n", program);
+    abort "must give one exponent arg";
+}
+exp = eval(argv(1));
+if (!isint(exp) || exp < 0) {
+    fprintf(stderr, "%s: exp must be non-negative integer\n", program);
    abort "must give one exponent arg";
 }

 /* print the mersenne number */
-print "2^": argv(0) : "-1 =", 2^eval(argv(0))-1;
+print "2^": exp : "-1 =", 2^exp-1;
 .fi
 .in -5n
 .sp 1
@@ -809,9 +870,9 @@ will print:
 .sp 1
 Note that because
 .B \-s
-is assumed in
+is required in
 .B "shell script mode"
-and non-dashed args are made available as
+non-dashed args are made available as
 strings via the
 .BR argv ()
 builtin function.
@@ -819,16 +880,16 @@ Therefore:
 .sp 1
 .in +5n
 .nf
-2^eval(argv(0))-1
+2^eval(argv(1))-1
 .fi
 .in -5n
 .sp 1
 will print the decimal value of 2^n-1
-but
+whereas
 .sp 1
 .in +5n
 .nf
-2^argv(0)-1
+2^argv(1)-1
 .fi
 .in -5n
 .sp 1
@@ -1042,6 +1103,14 @@ Default value: binding
 This variable is not used if calc was compiled with GNU-readline support.
 In that case, the standard readline mechanisms (see readline(3)) are used.
 .sp
+.TP 5
+CALCHISTFILE
+Location of the calc history file.
+.sp
+Default value: ~/.calc_history
+.sp
+This variable is not used if calc was compiled with GNU-readline support.
+.sp
 .SH CREDIT
 \&
 .br
--- a/calc.spec.in
+++ b/calc.spec.in
@@ -32,7 +32,7 @@
 Summary: Arbitrary precision calculator.
 Name: calc
 Version: <<<PROJECT_VERSION>>>
-Release: 12
+Release: 13
 License: LGPL
 Group: Applications/Engineering
 Source: http://www.isthe.com/chongo/src/calc/%{name}-%{version}.tar.bz2
@@ -76,48 +76,48 @@ For the latest calc release, see the project home page:

 %build
 echo '-=- calc.spec beginning make clobber -=-'
-make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} \
+make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} ARCH_CFLAGS= \
     CALC_SHAREDIR=%{_datadir}/%{name} CALC_INCDIR=%{_includedir}/calc \
     MANDIR=%{_mandir}/man1 EXT= V=@ clobber
 echo '-=- calc.spec ending make clobber -=-'
 echo '-=- calc.spec beginning make calc-static-only -=-'
-make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} \
+make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} ARCH_CFLAGS= \
     CALC_SHAREDIR=%{_datadir}/%{name} CALC_INCDIR=%{_includedir}/calc \
     MANDIR=%{_mandir}/man1 EXT= V=@ calc-static-only BLD_TYPE=calc-static-only
 echo '-=- calc.spec ending make calc-static-only -=-'
 echo '-=- calc.spec beginning make rpm-hide-static -=-'
-make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} \
+make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} ARCH_CFLAGS= \
     CALC_SHAREDIR=%{_datadir}/%{name} CALC_INCDIR=%{_includedir}/calc \
     MANDIR=%{_mandir}/man1 EXT= V=@ rpm-hide-static
 echo '-=- calc.spec ending make rpm-hide-static -=-'
 echo '-=- calc.spec beginning make clobber (again) -=-'
-make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} \
+make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} ARCH_CFLAGS= \
     CALC_SHAREDIR=%{_datadir}/%{name} CALC_INCDIR=%{_includedir}/calc \
     MANDIR=%{_mandir}/man1 EXT= V=@ clobber
 echo '-=- calc.spec ending make clobber (again) -=-'
 echo '-=- calc.spec beginning make calc-dynamic-only -=-'
-make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} \
+make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} ARCH_CFLAGS= \
     CALC_SHAREDIR=%{_datadir}/%{name} CALC_INCDIR=%{_includedir}/calc \
     MANDIR=%{_mandir}/man1 EXT= V=@ calc-dynamic-only \
     BLD_TYPE=calc-dynamic-only LD_SHARE=
 echo '-=- calc.spec ending make calc-dynamic-only -=-'
 echo '-=- calc.spec beginning make chk -=-'
-make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} \
+make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} ARCH_CFLAGS= \
     CALC_SHAREDIR=%{_datadir}/%{name} CALC_INCDIR=%{_includedir}/calc \
     MANDIR=%{_mandir}/man1 EXT= V=@ chk
 echo '-=- calc.spec ending make chk -=-'
 echo '-=- calc.spec beginning make rpm-unhide-static -=-'
-make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} \
+make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} ARCH_CFLAGS= \
     CALC_SHAREDIR=%{_datadir}/%{name} CALC_INCDIR=%{_includedir}/calc \
     MANDIR=%{_mandir}/man1 EXT= V=@ rpm-unhide-static
 echo '-=- calc.spec ending make rpm-unhide-static -=-'
 echo '-=- calc.spec beginning make rpm-clean-static -=-'
-make -j1 BINDIR=%{_bindir} LIBDIR=%{_libdir} \
+make -j1 BINDIR=%{_bindir} LIBDIR=%{_libdir} ARCH_CFLAGS= \
     CALC_SHAREDIR=%{_datadir}/%{name} CALC_INCDIR=%{_includedir}/calc \
     MANDIR=%{_mandir}/man1 EXT= V=@ rpm-clean-static
 echo '-=- calc.spec ending make rpm-clean-static -=-'
 echo '-=- calc.spec beginning make rpm-chk-static -=-'
-make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} \
+make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} ARCH_CFLAGS= \
     CALC_SHAREDIR=%{_datadir}/%{name} CALC_INCDIR=%{_includedir}/calc \
     MANDIR=%{_mandir}/man1 EXT= V=@ rpm-chk-static
 echo '-=- calc.spec ending make rpm-chk-static -=-'
@@ -125,7 +125,7 @@ echo '-=- calc.spec ending make rpm-chk-static -=-'
 %install
 echo '-=- calc.spec beginning make install -=-'
 mkdir -p %{_buildroot}
-make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} \
+make -j1 T=%{_buildroot} BINDIR=%{_bindir} LIBDIR=%{_libdir} ARCH_CFLAGS= \
     CALC_SHAREDIR=%{_datadir}/%{name} CALC_INCDIR=%{_includedir}/calc \
     MANDIR=%{_mandir}/man1 EXT= V=@ install
 echo '-=- calc.spec ending make install -=-'
@@ -165,6 +165,12 @@ echo '-=- calc.spec beginning make clean -=-'
 %attr(644, root, root) %{_libdir}/libcustcalc.a

 %changelog
+* Sun Mar 24 2019 cLandon Curt Noll http://www.isthe.com/chongo
+- Release: 13
+- Disable compiling with the default ARCH_CFLAGS= -march=native
+  by clearking the ARCH_CFLAGS value in order to maximize
+  the RPM binary protability.
+
 * Mon Sep 01 2014 Landon Curt Noll http://www.isthe.com/chongo
 - Release: 12
 - Removed use of %{?_smp_mflags}.  On Ubuntu 14.04, the -j2
--- a/calcerr.tbl
+++ b/calcerr.tbl
@@ -451,6 +451,7 @@ E_FPATHOPEN1	Non-string arguments for fpathopen
 E_FPATHOPEN2	Unrecognized mode for fpathopen
 E_LOG1		Bad epsilon argument for log
 E_LOG2		Non-numeric first argument for log
+E_LOG3		Cannot calculate log for this value
 E_FGETFILE1	Non-file argument for fgetfile
 E_FGETFILE2	File argument for fgetfile not open for reading
 E_FGETFILE3	Unable to set file position in fgetfile
@@ -471,3 +472,27 @@ E_ISSPACE	Bad argument for isspace
 E_ISXDIGIT	Bad argument for isxdigit
 E_STRTOUPPER    Bad argument type for strtoupper
 E_STRTOLOWER    Bad argument type for strtolower
+E_TAN3		Invalid value for calculating the sin numerator for tan
+E_TAN4		Invalid value for calculating the cos denominator for tan
+E_COT3		Invalid value for calculating the sin numerator for cot
+E_COT4		Invalid value for calculating the cos denominator for cot
+E_SEC3		Invalid value for calculating the cos reciprocal for sec
+E_CSC3		Invalid value for calculating the sin reciprocal for csc
+E_TANH3		Invalid value for calculating the sinh numerator for tanh
+E_TANH4		Invalid value for calculating the cosh denominator for tanh
+E_COTH3		Invalid value for calculating the sinh numerator for coth
+E_COTH4		Invalid value for calculating the cosh denominator for coth
+E_SECH3		Invalid value for calculating the cosh reciprocal for sech
+E_CSCH3		Invalid value for calculating the sinh reciprocal for csch
+E_ASIN3		Invalid value for calculating asin
+E_ACOS3		Invalid value for calculating acos
+E_ASINH3	Invalid value for calculating asinh
+E_ACOSH3	Invalid value for calculating acosn
+E_ATAN3		Invalid value for calculating atan
+E_ACOT3		Invalid value for calculating acot
+E_ASEC3		Invalid value for calculating asec
+E_ACSC3		Invalid value for calculating acsc
+E_ATANH3	Invalid value for calculating atan
+E_ACOTH3	Invalid value for calculating acot
+E_ASECH3	Invalid value for calculating asec
+E_ACSCH3	Invalid value for calculating acsc
--- a/codegen.c
+++ b/codegen.c
@@ -1021,7 +1021,7 @@ getstatement(LABEL *contlabel, LABEL *breaklabel,
 			return;
 		}
 		reread();
-		/* fall into default case */
+		/*FALLTHRU*/

 	default:
 		rescantoken();
@@ -1384,6 +1384,7 @@ creatematrix(void)
 		switch (gettoken()) {
 		case T_RIGHTBRACKET:
 			rescantoken();
+			/*FALLTHRU*/
 		case T_COMMA:
 			addop(OP_ONE);
 			addop(OP_SUB);
@@ -1394,6 +1395,7 @@ creatematrix(void)
 			switch(gettoken()) {
 			case T_RIGHTBRACKET:
 				rescantoken();
+				/*FALLTHRU*/
 			case T_COMMA:
 				continue;
 			}
@@ -2211,6 +2213,7 @@ getterm(void)
 				scanerror(T_NULL,
 					  "Function calls not allowed "
 					  "as expressions");
+				/*FALLTHRU*/
 			default:
 				rescantoken();
 			return type;
@@ -2248,7 +2251,7 @@ getidexpr(BOOL okmat, int autodef)
 		if (autodef != T_GLOBAL && autodef != T_LOCAL &&
 				autodef != T_STATIC)
 			autodef = 1;
-		/* fall into default case */
+		/*FALLTHRU*/
 	default:
 		rescantoken();
 		usesymbol(name, autodef);
@@ -2277,6 +2280,7 @@ getidexpr(BOOL okmat, int autodef)
 			scanerror(T_NULL,
 				  "Function calls not allowed "
 				  "as expressions");
+			/*FALLTHRU*/
 		default:
 			rescantoken();
 			return type;
--- a/comfunc.c
+++ b/comfunc.c
@@ -1182,7 +1182,7 @@ comprint(COMPLEX *c)
 		return;
 	}
 	if (!qiszero(c->real) || qiszero(c->imag))
-		qprintnum(c->real, MODE_DEFAULT);
+		qprintnum(c->real, MODE_DEFAULT, conf->outdigits);
 	qtmp = c->imag[0];
 	if (qiszero(&qtmp))
 		return;
@@ -1192,7 +1192,7 @@ comprint(COMPLEX *c)
 		math_chr('-');
 		qtmp.num.sign = 0;
 	}
-	qprintnum(&qtmp, MODE_DEFAULT);
+	qprintnum(&qtmp, MODE_DEFAULT, conf->outdigits);
 	math_chr('i');
 }

--- a/config.c
+++ b/config.c
@@ -274,6 +274,7 @@ STATIC NAMETYPE modes[] = {
 	{"oct",		MODE_OCTAL},
 	{"binary",	MODE_BINARY},
 	{"bin",		MODE_BINARY},
+	{"float-auto",	MODE_REAL_AUTO},
 	{"off",		MODE2_OFF},
 	{NULL,		0}
 };
@@ -908,34 +909,42 @@ setconfig(int type, VALUE *vp)
 	case CONFIG_PROGRAM:
 		math_error("The program config parameter is read-only");
 		/*NOTREACHED*/
+		abort();

 	case CONFIG_BASENAME:
 		math_error("The basename config parameter is read-only");
 		/*NOTREACHED*/
+		abort();

 	case CONFIG_WINDOWS:
 		math_error("The windows config parameter is read-only");
 		/*NOTREACHED*/
+		abort();

 	case CONFIG_CYGWIN:
 		math_error("The cygwin config parameter is read-only");
 		/*NOTREACHED*/
+		abort();

 	case CONFIG_COMPILE_CUSTOM:
 		math_error("The custom config parameter is read-only");
 		/*NOTREACHED*/
+		abort();

 	case CONFIG_ALLOW_CUSTOM:
 		math_error("The allow_custom config parameter is read-only");
 		/*NOTREACHED*/
+		abort();

 	case CONFIG_VERSION:
 		math_error("The version config parameter is read-only");
 		/*NOTREACHED*/
+		abort();

 	case CONFIG_BASEB:
 		math_error("The baseb config parameter is read-only");
 		/*NOTREACHED*/
+		abort();

 	case CONFIG_REDECL_WARN:
 		if (vp->v_type == V_NUM) {
@@ -970,10 +979,12 @@ setconfig(int type, VALUE *vp)
 	case CONFIG_HZ:
 		math_error("The clock tick rate config parameter is read-only");
 		/*NOTREACHED*/
+		abort();

 	default:
 		math_error("Setting illegal config parameter");
 		/*NOTREACHED*/
+		abort();
 	}
 }

--- a/cscript/4dsphere.calc
+++ b/cscript/4dsphere.calc
@@ -10,7 +10,7 @@
 *	...		...
 *      x5 y5 z5 w5	point 5 in R^4
 *
- * Copyright (C) 2001,2014  Landon Curt Noll
+ * Copyright (C) 2001,2014,2019  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -37,9 +37,11 @@
 * parse args
 */
 argc = argv();
-if (argc != 25) {
-    fprintf(files(2), "usage: %s x0 y0 z0 w0 x1 y1 z1 w1 ... x5 y5 z5 w5\n",
-	argv(0));
+stderr = files(2);
+program = argv(0);
+if (argc != 24) {
+    fprintf(stderr, "usage: %s x0 y0 z0 w0 x1 y1 z1 w1 ... x5 y5 z5 w5\n",
+		    program);
    exit;
 }
 x0 = eval(argv(1));
--- a/cscript/Makefile
+++ b/cscript/Makefile
@@ -199,7 +199,7 @@ SCRIPT= 4dsphere fproduct mersenne piforever plus powerterm \
 	simple square

 SCRIPT_SRC= 4dsphere.calc fproduct.calc mersenne.calc \
-	piforever.calc plus.calc powerterm.calc simple.calc square.calc
+	piforever.calc plus.calc powerterm.calc simple.calc

 # These files are found (but not built) in the distribution
 #
--- a/cscript/fproduct.calc
+++ b/cscript/fproduct.calc
@@ -8,7 +8,7 @@
 *	filename	where to write the product, use - for stdout
 *	term ...	terms to multiply
 *
- * Copyright (C) 2001,2014  Landon Curt Noll
+ * Copyright (C) 2001,2014,2019  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -35,8 +35,10 @@
 * parse args
 */
 argc = argv();
+stderr = files(2);
+program = argv(0);
 if (argc < 2) {
-    fprintf(files(2), "usage: %s term [term ...]\n", argv(0));
+    fprintf(stderr, "usage: %s term [term ...]\n", program);
    exit;
 }
 filename = argv(1);
--- a/cscript/mersenne.calc
+++ b/cscript/mersenne.calc
@@ -2,7 +2,7 @@
 /*
 * mersenne - print the value of a mersenne number
 *
- * Copyright (C) 1999-2007,2014  Landon Curt Noll
+ * Copyright (C) 1999-2007,2014,2019  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -32,16 +32,19 @@
 /*
 * parse args
 */
-if (argv() != 2) {
-	/* we include the name of this script in the error message */
-	fprintf(files(2), "usage: %s exp\n", config("program"));
-	abort "wrong number of args";
+argc = argv();
+stderr = files(2);
+program = argv(0);
+if (argc != 2) {
+    /* we include the name of this script in the error message */
+    fprintf(stderr, "usage: %s exp\n", program);
+    abort "wrong number of args";
 }

-global n = eval(argv(1));
+n = eval(argv(1));

 if (!isint(n) || n <= 0) {
-	quit "Argument to be a positive integer";
+    quit "Argument to be a positive integer";
 }

 /*
--- a/cscript/piforever.calc
+++ b/cscript/piforever.calc
@@ -1,8 +1,8 @@
-#!/usr/local/src/bin/calc/calc -q -f
+#!/usr/local/src/bin/calc/calc -q -s -f
 /*
 * piforever - print digits of pi forever (or as long as your mem/cpu allow)
 *
- * Copyright (C) 1999-2007,2014  Landon Curt Noll
+ * Copyright (C) 1999-2007,2014,2019  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
--- a/cscript/plus.calc
+++ b/cscript/plus.calc
@@ -1,8 +1,8 @@
-#!/usr/local/src/bin/calc/calc -q -f
+#!/usr/local/src/bin/calc/calc -q -s -f
 /*
 * plus - add two or more arguments together
 *
- * Copyright (C) 1999-2007,2014  Landon Curt Noll
+ * Copyright (C) 1999-2007,2014,2019  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -32,10 +32,13 @@
 /*
 * parse args
 */
-if (argv() < 2) {
-	/* we include the name of this script in the error message */
-	fprintf(files(2), "usage: %s value ...\n", config("program"));
-	abort "not enough args";
+argc = argv();
+stderr = files(2);
+program = argv(0);
+if (argc < 2) {
+    /* we include the name of this script in the error message */
+    fprintf(stderr, "usage: %s value ...\n", program);
+    abort "not enough args";
 }

 /*
@@ -45,6 +48,6 @@ if (argv() < 2) {
 */
 sum = 0;
 for (i=1; i < argv(); ++i) {
-	sum += eval(argv(i));
+    sum += eval(argv(i));
 }
 print sum;
--- a/cscript/powerterm.calc
+++ b/cscript/powerterm.calc
@@ -8,7 +8,7 @@
 *	base_limit	largest base we will consider (def: 10000)
 *      value		value to convert into sums of powers of integers
 *
- * Copyright (C) 2001,2014  Landon Curt Noll
+ * Copyright (C) 2001,2014,2019  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the powerterm of the version 2.1 of the GNU Lesser General Public License
@@ -35,28 +35,31 @@
 /*
 * parse args
 */
+argc = argv();
+stderr = files(2);
+program = argv(0);
 config("verbose_quit", 0),;
 base_lim = 10000;		/* default: highest base we will consider */
-if (argv() < 2 || argv() > 3) {
-    fprintf(files(2), "usage: %s [base_limit] value\n", argv(0));
+if (argc < 2 || argc > 3) {
+    fprintf(stderr, "usage: %s [base_limit] value\n", program);
    exit;
 }
-if (argv() == 3) {
+if (argc == 3) {
    x = eval(argv(2));
    base_lim = eval(argv(1));
 } else {
    x = eval(argv(1));
 }
 if (! isint(x)) {
-    fprintf(files(2), "%s: value must be an integer\n");
+    fprintf(stderr, "%s: value must be an integer\n", program);
    exit;
 }
 if (! isint(base_lim)) {
-    fprintf(files(2), "%s: base limit must be an integer\n");
+    fprintf(stderr, "%s: base limit must be an integer\n", program);
    exit;
 }
 if (base_lim <= 1) {
-    fprintf(files(2), "%s: base limit is too small\n");
+    fprintf(stderr, "%s: base limit is too small\n", program);
    exit;
 }
 ++base_lim;
--- a/cscript/simple.calc
+++ b/cscript/simple.calc
@@ -1,8 +1,8 @@
-#!/usr/local/src/bin/calc/calc -q -f
+#!/usr/local/src/bin/calc/calc -q -s -f
 /*
 * simple - an example of a simple calc shell script
 *
- * Copyright (C) 1999-2007,2014  Landon Curt Noll
+ * Copyright (C) 1999-2007,2014,2019  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -30,3 +30,9 @@
 * This is an example of a simple calc shell script.
 */
 print "This simple calc shell script works!"
+print "config(\"program\")=", config("program");
+print "argv()=", argv();
+argc = argv();
+for (i=0; i < argc; ++i) {
+    print "argv(":i:")=", argv(i);
+}
--- a/cscript/square.calc
+++ b/cscript/square.calc
@@ -1,8 +1,8 @@
-#!/usr/local/src/bin/calc/calc -q -f
+#!/usr/local/src/bin/calc/calc -q -s -f
 /*
 * sqaure - print the squares of input values
 *
- * Copyright (C) 2000-2007,2014  Ernest Bowen
+ * Copyright (C) 2000-2007,2014,2019  Ernest Bowen
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -33,10 +33,6 @@
 *               cat file | ./square
 *               echo "123" | ./square
 *
- *       Within calc:
- *
- *               > read square
- *
 *  With input from a terminal, there is no prompt but each non-empty
 *  line of input is evaluated as a calc expression and if it can be
 *  calculated, the square of the value of that expression is displayed.
@@ -59,6 +55,6 @@
 */


-global s;
-while ((s = prompt("")))
+while (s = fgetline(files(0))) {
 	print "\t":eval(s)^2;
+}
--- a/custom.c
+++ b/custom.c
@@ -1,7 +1,7 @@
 /*
 * custom - interface for custom software and hardware interfaces
 *
- * Copyright (C) 1999-2006  Landon Curt Noll
+ * Copyright (C) 1999-2006,2018  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -180,6 +180,7 @@ customhelp(char *name)
 #if defined(CUSTOM)

 	char *customname;	/* a string of the form: custom/name */
+	size_t snprintf_len;	/* malloced snprintf buffer length */

 	/*
 	 * firewall
@@ -191,12 +192,14 @@ customhelp(char *name)
 	/*
 	 * form the custom help name
 	 */
-	customname = (char *)malloc(sizeof("custhelp")+1+strlen(name)+1);
+	snprintf_len = sizeof("custhelp")+1+strlen(name)+1;
+	customname = (char *)malloc(snprintf_len+1);
 	if (customname == NULL) {
 		math_error("bad malloc of customname");
 		/*NOTREACHED*/
 	}
-	sprintf(customname, "custhelp/%s", name);
+	snprintf(customname, snprintf_len, "custhelp/%s", name);
+	customname[snprintf_len] = '\0';	/* paranoia */

 	/*
 	 * give help directly to the custom file
--- a/custom/Makefile
+++ b/custom/Makefile
@@ -2,7 +2,7 @@
 #
 # custom - makefile for calc custom routines
 #
-# Copyright (C) 1999-2006,2014,2017  Landon Curt Noll
+# Copyright (C) 1999-2006,2014,2017-2018  Landon Curt Noll
 #
 # Calc is open software; you can redistribute it and/or modify it under
 # the terms of the version 2.1 of the GNU Lesser General Public License
@@ -348,7 +348,7 @@ EXT=

 # The default calc versions
 #
-VERSION= 2.12.6.4
+VERSION= 2.12.7.5

 # Names of shared libraries with versions
 #
--- a/custom/Makefile.head
+++ b/custom/Makefile.head
@@ -2,7 +2,7 @@
 #
 # custom - makefile for calc custom routines
 #
-# Copyright (C) 1999-2006,2014,2017  Landon Curt Noll
+# Copyright (C) 1999-2006,2014,2017-2018  Landon Curt Noll
 #
 # Calc is open software; you can redistribute it and/or modify it under
 # the terms of the version 2.1 of the GNU Lesser General Public License
@@ -348,7 +348,7 @@ EXT=

 # The default calc versions
 #
-VERSION= 2.12.6.4
+VERSION= 2.12.7.5

 # Names of shared libraries with versions
 #
--- a/custom/c_sysinfo.c
+++ b/custom/c_sysinfo.c
@@ -173,8 +173,6 @@ STATIC struct infoname sys_info[] = {
     (FULL)MAXSCANCOUNT},
    {"MAXSTACK", "max depth of evaluation stack", NULL,
     (FULL)MAXSTACK},
-    {"MAXSTRING", "max size of string constant", NULL,
-     (FULL)MAXSTRING},
    {"MAXUFULL", "largest FULL value", NULL,
     (FULL)MAXUFULL},
    {"MAXULONG", "largest unsigned long val", NULL,
--- a/file.c
+++ b/file.c
@@ -1,7 +1,7 @@
 /*
 * file - file I/O routines callable by users
 *
- * Copyright (C) 1999-2007  David I. Bell and Landon Curt Noll
+ * Copyright (C) 1999-2007,2018  David I. Bell and Landon Curt Noll
 *
 * Primary author:  David I. Bell
 *
@@ -143,6 +143,7 @@ file_init(void)
 		 * stat the descriptor to see what we have
 		 */
 		if (fstat(i, &sbuf) >= 0) {
+			size_t snprintf_len;	/* malloced snprintf length */
 			fp = (FILE *) fdopen(i,"r+");	/*guess mode*/
 			if (fp) {
 				strcpy(files[idnum].mode, "r+");
@@ -161,12 +162,15 @@ file_init(void)
 						continue;
 				}
 			}
-			tname = (char *)malloc(sizeof("descriptor[19]"));
+			snprintf_len =
+			  sizeof("descriptor[12345678901234567890]") + 1;
+			tname = (char *)malloc(snprintf_len+1);
 			if (tname == NULL) {
 				math_error("Out of memory for init_file");
 				/*NOTREACHED*/
 			}
-			sprintf(tname, "descriptor[%d]", i);
+			snprintf(tname, snprintf_len, "descriptor[%d]", i);
+			tname[snprintf_len] = '\0';	/* paranoia */
 			files[idnum].name = tname;
 			files[idnum].id = idnum;
 			files[idnum].fp = fp;
@@ -1017,6 +1021,7 @@ idprintf(FILEID id, char *fmt, int count, VALUE **vals)
 		switch (ch) {
 		case 's':
 			printstring = TRUE;
+			/*FALLTHRU*/
 		case 'c':
 			printchar = TRUE;
 		case 'd':
@@ -1027,6 +1032,9 @@ idprintf(FILEID id, char *fmt, int count, VALUE **vals)
 		case 'e':
 			newmode = MODE_EXP;
 			break;
+		case 'g':
+			newmode = MODE_REAL_AUTO;
+			break;
 		case 'r':
 			newmode = MODE_FRAC;
 			break;
--- a/fposval.c
+++ b/fposval.c
@@ -125,7 +125,8 @@ main(int argc, char **argv)
 	 * systems a FILEPOS is not a scalar hince we must memcpy.
 	 */
 	printf("#define SWAP_HALF_IN_FILEPOS(dest, src)\t%s\n",
-	    "memcpy((void *)(dest), (void *)(src), sizeof(FPOS_POS_LEN))");
+	    "\\\n\tmemcpy((void *)(dest), (void *)(src), "
+	    "sizeof(FPOS_POS_LEN))");
 #endif /* HAVE_FILEPOS_SCALAR */
 #endif /* CALC_BYTE_ORDER == BIG_ENDIAN */
 	putchar('\n');
--- a/func.c
+++ b/func.c
@@ -1,7 +1,7 @@
 /*
 * func - built-in functions implemented here
 *
- * Copyright (C) 1999-2007  David I. Bell, Landon Curt Noll and Ernest Bowen
+ * Copyright (C) 1999-2007,2018  David I. Bell, Landon Curt Noll & Ernest Bowen
 *
 * Primary author:  David I. Bell
 *
@@ -335,7 +335,7 @@ f_str(VALUE *vp)
 		break;
 	case V_NUM:
 		math_divertio();
-		qprintnum(vp->v_num, MODE_DEFAULT);
+		qprintnum(vp->v_num, MODE_DEFAULT, conf->outdigits);
 		cp = math_getdivertedio();
 		result.v_str = makestring(cp);
 		break;
@@ -2122,6 +2122,9 @@ f_log(int count, VALUE **vals)
 		default:
 			return error_value(E_LOG2);
 	}
+	if (c == NULL) {
+		return error_value(E_LOG3);
+	}
 	result.v_type = V_COM;
 	result.v_com = c;
 	if (cisreal(c)) {
@@ -2239,8 +2242,15 @@ f_tan(int count, VALUE **vals)
 		case V_COM:
 			tmp1.v_type = V_COM;
 			tmp1.v_com = c_sin(vals[0]->v_com, err);
+			if (tmp1.v_com == NULL) {
+				return error_value(E_TAN3);
+			}
 			tmp2.v_type = V_COM;
 			tmp2.v_com = c_cos(vals[0]->v_com, err);
+			if (tmp2.v_com == NULL) {
+				comfree(tmp1.v_com);
+				return error_value(E_TAN4);
+			}
 			divvalue(&tmp1, &tmp2, &result);
 			comfree(tmp1.v_com);
 			comfree(tmp2.v_com);
@@ -2276,6 +2286,9 @@ f_sec(int count, VALUE **vals)
 		case V_COM:
 			tmp.v_type = V_COM;
 			tmp.v_com = c_cos(vals[0]->v_com, err);
+			if (tmp.v_com == NULL) {
+				return error_value(E_SEC3);
+			}
 			invertvalue(&tmp, &result);
 			comfree(tmp.v_com);
 			break;
@@ -2314,8 +2327,15 @@ f_cot(int count, VALUE **vals)
 		case V_COM:
 			tmp1.v_type = V_COM;
 			tmp1.v_com = c_cos(vals[0]->v_com, err);
+			if (tmp1.v_com == NULL) {
+				return error_value(E_COT3);
+			}
 			tmp2.v_type = V_COM;
 			tmp2.v_com = c_sin(vals[0]->v_com, err);
+			if (tmp2.v_com == NULL) {
+				comfree(tmp1.v_com);
+				return error_value(E_COT4);
+			}
 			divvalue(&tmp1, &tmp2, &result);
 			comfree(tmp1.v_com);
 			comfree(tmp2.v_com);
@@ -2354,6 +2374,9 @@ f_csc(int count, VALUE **vals)
 		case V_COM:
 			tmp.v_type = V_COM;
 			tmp.v_com = c_sin(vals[0]->v_com, err);
+			if (tmp.v_com == NULL) {
+				return error_value(E_CSC3);
+			}
 			invertvalue(&tmp, &result);
 			comfree(tmp.v_com);
 			break;
@@ -2476,8 +2499,15 @@ f_tanh(int count, VALUE **vals)
 		case V_COM:
 			tmp1.v_type = V_COM;
 			tmp1.v_com = c_sinh(vals[0]->v_com, err);
+			if (tmp1.v_com == NULL) {
+				return error_value(E_TANH3);
+			}
 			tmp2.v_type = V_COM;
 			tmp2.v_com = c_cosh(vals[0]->v_com, err);
+			if (tmp2.v_com == NULL) {
+				comfree(tmp1.v_com);
+				return error_value(E_TANH4);
+			}
 			divvalue(&tmp1, &tmp2, &result);
 			comfree(tmp1.v_com);
 			comfree(tmp2.v_com);
@@ -2517,8 +2547,15 @@ f_coth(int count, VALUE **vals)
 		case V_COM:
 			tmp1.v_type = V_COM;
 			tmp1.v_com = c_cosh(vals[0]->v_com, err);
+			if (tmp1.v_com == NULL) {
+				return error_value(E_COTH3);
+			}
 			tmp2.v_type = V_COM;
 			tmp2.v_com = c_sinh(vals[0]->v_com, err);
+			if (tmp2.v_com == NULL) {
+				comfree(tmp1.v_com);
+				return error_value(E_COTH4);
+			}
 			divvalue(&tmp1, &tmp2, &result);
 			comfree(tmp1.v_com);
 			comfree(tmp2.v_com);
@@ -2555,6 +2592,9 @@ f_sech(int count, VALUE **vals)
 		case V_COM:
 			tmp.v_type = V_COM;
 			tmp.v_com = c_cosh(vals[0]->v_com, err);
+			if (tmp.v_com == NULL) {
+				return error_value(E_SECH3);
+			}
 			invertvalue(&tmp, &result);
 			comfree(tmp.v_com);
 			break;
@@ -2592,6 +2632,9 @@ f_csch(int count, VALUE **vals)
 		case V_COM:
 			tmp.v_type = V_COM;
 			tmp.v_com = c_sinh(vals[0]->v_com, err);
+			if (tmp.v_com == NULL) {
+				return error_value(E_CSCH3);
+			}
 			invertvalue(&tmp, &result);
 			comfree(tmp.v_com);
 			break;
@@ -2626,7 +2669,7 @@ f_atan(int count, VALUE **vals)
 		case V_COM:
 			tmp = c_atan(vals[0]->v_com, err);
 			if (tmp == NULL)
-				return error_value(E_LOGINF);
+				return error_value(E_ATAN3);
 			result.v_type = V_COM;
 			result.v_com = tmp;
 			if (cisreal(tmp)) {
@@ -2666,7 +2709,7 @@ f_acot(int count, VALUE **vals)
 		case V_COM:
 			tmp = c_acot(vals[0]->v_com, err);
 			if (tmp == NULL)
-				return error_value(E_LOGINF);
+				return error_value(E_ACOT3);
 			result.v_type = V_COM;
 			result.v_com = tmp;
 			if (cisreal(tmp)) {
@@ -2718,6 +2761,9 @@ f_asin(int count, VALUE **vals)
 		default:
 			return error_value(E_ASIN2);
 	}
+	if (result.v_com == NULL) {
+		return error_value(E_ASIN3);
+	}
 	if (result.v_type == V_COM && cisreal(result.v_com)) {
 		q = qlink(result.v_com->real);
 		comfree(result.v_com);
@@ -2764,6 +2810,9 @@ f_acos(int count, VALUE **vals)
 		default:
 			return error_value(E_ACOS2);
 	}
+	if (result.v_com == NULL) {
+		return error_value(E_ACOS3);
+	}
 	if (result.v_type == V_COM && cisreal(result.v_com)) {
 		q = qlink(result.v_com->real);
 		comfree(result.v_com);
@@ -2794,7 +2843,7 @@ f_asec(int count, VALUE **vals)
 	switch (vals[0]->v_type) {
 		case V_NUM:
 			if (qiszero(vals[0]->v_num))
-				return error_value(E_LOGINF);
+				return error_value(E_ASEC3);
 			result.v_num = qasec(vals[0]->v_num, err);
 			result.v_type = V_NUM;
 			if (result.v_num == NULL) {
@@ -2813,9 +2862,10 @@ f_asec(int count, VALUE **vals)
 		default:
 			return error_value(E_ASEC2);
 	}
+	if (result.v_com == NULL) {
+		return error_value(E_ASEC3);
+	}
 	if (result.v_type == V_COM) {
-		if (result.v_com == NULL)
-			return error_value(E_LOGINF);
 		if (cisreal(result.v_com)) {
 			q = qlink(result.v_com->real);
 			comfree(result.v_com);
@@ -2847,7 +2897,7 @@ f_acsc(int count, VALUE **vals)
 	switch (vals[0]->v_type) {
 		case V_NUM:
 			if (qiszero(vals[0]->v_num))
-				return error_value(E_LOGINF);
+				return error_value(E_ACSC3);
 			result.v_num = qacsc(vals[0]->v_num, err);
 			result.v_type = V_NUM;
 			if (result.v_num == NULL) {
@@ -2866,9 +2916,10 @@ f_acsc(int count, VALUE **vals)
 		default:
 			return error_value(E_ACSC2);
 	}
+	if (result.v_com == NULL) {
+		return error_value(E_ACSC3);
+	}
 	if (result.v_type == V_COM) {
-		if (result.v_com == NULL)
-			return error_value(E_LOGINF);
 		if (cisreal(result.v_com)) {
 			q = qlink(result.v_com->real);
 			comfree(result.v_com);
@@ -2903,6 +2954,9 @@ f_asinh(int count, VALUE **vals)
 			break;
 		case V_COM:
 			tmp = c_asinh(vals[0]->v_com, err);
+			if (tmp == NULL) {
+				return error_value(E_ASINH3);
+			}
 			result.v_type = V_COM;
 			result.v_com = tmp;
 			if (cisreal(tmp)) {
@@ -2955,6 +3009,9 @@ f_acosh(int count, VALUE **vals)
 		default:
 			return error_value(E_ACOSH2);
 	}
+	if (result.v_com == NULL) {
+		return error_value(E_ACOSH3);
+	}
 	if (result.v_type == V_COM && cisreal(result.v_com)) {
 		q = qlink(result.v_com->real);
 		comfree(result.v_com);
@@ -3002,9 +3059,10 @@ f_atanh(int count, VALUE **vals)
 		default:
 			return error_value(E_ATANH2);
 	}
+	if (result.v_com == NULL) {
+		return error_value(E_ATANH3);
+	}
 	if (result.v_type == V_COM) {
-		if (result.v_com == NULL)
-			return error_value(E_LOGINF);
 		if (cisreal(result.v_com)) {
 			q = qlink(result.v_com->real);
 			comfree(result.v_com);
@@ -3053,9 +3111,10 @@ f_acoth(int count, VALUE **vals)
 		default:
 			return error_value(E_ACOTH2);
 	}
+	if (result.v_com == NULL) {
+		return error_value(E_ACOTH3);
+	}
 	if (result.v_type == V_COM) {
-		if (result.v_com == NULL)
-			return error_value(E_LOGINF);
 		if (cisreal(result.v_com)) {
 			q = qlink(result.v_com->real);
 			comfree(result.v_com);
@@ -3087,7 +3146,7 @@ f_asech(int count, VALUE **vals)
 	switch (vals[0]->v_type) {
 		case V_NUM:
 			if (qiszero(vals[0]->v_num))
-				return error_value(E_LOGINF);
+				return error_value(E_ASECH3);
 			result.v_num = qasech(vals[0]->v_num, err);
 			result.v_type = V_NUM;
 			if (result.v_num == NULL) {
@@ -3106,9 +3165,10 @@ f_asech(int count, VALUE **vals)
 		default:
 			return error_value(E_ASECH2);
 	}
+	if (result.v_com == NULL) {
+		return error_value(E_ASECH3);
+	}
 	if (result.v_type == V_COM) {
-		if (result.v_com == NULL)
-			return error_value(E_LOGINF);
 		if (cisreal(result.v_com)) {
 			q = qlink(result.v_com->real);
 			comfree(result.v_com);
@@ -3140,7 +3200,7 @@ f_acsch(int count, VALUE **vals)
 	switch (vals[0]->v_type) {
 		case V_NUM:
 			if (qiszero(vals[0]->v_num))
-				return error_value(E_LOGINF);
+				return error_value(E_ACSCH3);
 			result.v_num = qacsch(vals[0]->v_num, err);
 			result.v_type = V_NUM;
 			if (result.v_num == NULL) {
@@ -3159,9 +3219,10 @@ f_acsch(int count, VALUE **vals)
 		default:
 			return error_value(E_ACSCH2);
 	}
+	if (result.v_com == NULL) {
+		return error_value(E_ACSCH3);
+	}
 	if (result.v_type == V_COM) {
-		if (result.v_com == NULL)
-			return error_value(E_LOGINF);
 		if (cisreal(result.v_com)) {
 			q = qlink(result.v_com->real);
 			comfree(result.v_com);
@@ -3260,7 +3321,7 @@ f_agd(int count, VALUE **vals)
 			return error_value(E_AGD2);
 	}
 	if (result.v_com == NULL)
-			return error_value(E_AGD3);
+		return error_value(E_AGD3);
 	if (cisreal(result.v_com)) {
 		q = qlink(result.v_com->real);
 		comfree(result.v_com);
@@ -6022,12 +6083,15 @@ f_strerror(int count, VALUE **vals)
 	/* firewall - return generic error string if it is not assigned */
 	if (i >= nexterrnum || (i > E__HIGHEST && i < E_USERDEF)
 			|| (i < E__BASE && strerror(i) == NULL)) {
-		cp = (char *) malloc(sizeof("Error 1234567890")+1);
+		size_t snprintf_len;	/* malloced snprintf buffer length */
+		snprintf_len = sizeof("Unknown error 12345678901234567890")+1;
+		cp = (char *) malloc(snprintf_len+1);
 		if (cp == NULL) {
 			math_error("Out of memory for strerror");
 			/*NOTREACHED*/
 		}
-		sprintf(cp, "Unknown error %ld", i);
+		snprintf(cp, snprintf_len, "Unknown error %ld", i);
+		cp[snprintf_len] = '\0';	/* paranoia */
 		result.v_str = makestring(cp);
 		return result;
 	}
@@ -7550,6 +7614,8 @@ f_putenv(int count, VALUE **vals)
 	 * parse args
 	 */
 	if (count == 2) {
+		size_t snprintf_len;	/* malloced snprintf buffer length */
+
 		/* firewall */
 		if (vals[0]->v_type != V_STR || vals[1]->v_type != V_STR) {
 			math_error("Non-string argument for putenv");
@@ -7557,14 +7623,17 @@ f_putenv(int count, VALUE **vals)
 		}

 		/* convert putenv("foo","bar") into putenv("foo=bar") */
-		putenv_str = (char *)malloc(vals[0]->v_str->s_len + 1 +
-			    vals[1]->v_str->s_len + 1);
+		snprintf_len = vals[0]->v_str->s_len + 1 +
+                               vals[1]->v_str->s_len + 1;
+		putenv_str = (char *)malloc(snprintf_len+1);
 		if (putenv_str == NULL) {
 			math_error("Cannot allocate string in putenv");
 			/*NOTREACHED*/
 		}
-		sprintf(putenv_str, "%s=%s", vals[0]->v_str->s_str,
+		snprintf(putenv_str, snprintf_len,
+			"%s=%s", vals[0]->v_str->s_str,
 			vals[1]->v_str->s_str);
+		putenv_str[snprintf_len] = '\0';	/* paranoia */


 	} else {
--- a/have_getpgid.c
+++ b/have_getpgid.c
@@ -1,7 +1,7 @@
 /*
 * have_getpgid - determine if we have getpgid()
 *
- * Copyright (C) 1999  Landon Curt Noll
+ * Copyright (C) 1999,2021  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -39,7 +39,10 @@
 */

 #include <sys/types.h>
+#include "have_unistd.h"
+#if defined(HAVE_UNISTD_H)
 #include <unistd.h>
+#endif

 int
 main(void)
--- a/have_getprid.c
+++ b/have_getprid.c
@@ -1,7 +1,7 @@
 /*
 * have_getprid - determine if we have getprid()
 *
- * Copyright (C) 1999  Landon Curt Noll
+ * Copyright (C) 1999,2021  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -40,7 +40,10 @@


 #include <sys/types.h>
+#include "have_unistd.h"
+#if defined(HAVE_UNISTD_H)
 #include <unistd.h>
+#endif

 int
 main(void)
--- a/have_getsid.c
+++ b/have_getsid.c
@@ -1,7 +1,7 @@
 /*
 * have_getsid - determine if we have getsid()
 *
- * Copyright (C) 1999  Landon Curt Noll
+ * Copyright (C) 1999,2021  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -40,6 +40,10 @@


 #include <sys/types.h>
+#include "have_unistd.h"
+#if defined(HAVE_UNISTD_H)
+#include <unistd.h>
+#endif

 int
 main(void)
--- a/have_memmv.c
+++ b/have_memmv.c
@@ -1,7 +1,7 @@
 /*
 * have_memmv - Determine if we have memmove()
 *
- * Copyright (C) 1999  Landon Curt Noll
+ * Copyright (C) 1999,2021  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -40,6 +40,7 @@


 #include <stdio.h>
+#include <string.h>

 #define MOVELEN 3

--- a/have_newstr.c
+++ b/have_newstr.c
@@ -1,7 +1,7 @@
 /*
 * have_newstr - Determine if we have a system without ANSI C string functions
 *
- * Copyright (C) 1999  Landon Curt Noll
+ * Copyright (C) 1999,2021  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -42,6 +42,7 @@


 #include <stdio.h>
+#include <string.h>

 #define MOVELEN 3

--- a/have_offscl.c
+++ b/have_offscl.c
@@ -1,7 +1,7 @@
 /*
 * have_offscl - determine if we have a scalar off_t element
 *
- * Copyright (C) 1999  Landon Curt Noll
+ * Copyright (C) 1999,2021  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -46,6 +46,10 @@
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include "have_unistd.h"
+#if defined(HAVE_UNISTD_H)
+#include <unistd.h>
+#endif

 int
 main(void)
--- a/have_posscl.c
+++ b/have_posscl.c
@@ -1,7 +1,7 @@
 /*
 * have_posscl - determine if we have a scalar FILEPOS element
 *
- * Copyright (C) 1999  Landon Curt Noll
+ * Copyright (C) 1999,2021  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -45,6 +45,10 @@
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include "have_unistd.h"
+#if defined(HAVE_UNISTD_H)
+#include <unistd.h>
+#endif
 #include "have_fpos.h"

 int
--- a/have_stdvs.c
+++ b/have_stdvs.c
@@ -1,7 +1,7 @@
 /*
- * have_stdvs - try <stdarg.h> to see if it really works with vsprintf()
+ * have_stdvs - try <stdarg.h> to see if it really works with vsnprintf()
 *
- * Copyright (C) 1999,2014  Landon Curt Noll
+ * Copyright (C) 1999,2014,2018  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -25,16 +25,16 @@
 */

 /*
- * On some systems that have both <stdarg.h> and <varargs.h>, vsprintf()
+ * On some systems that have both <stdarg.h> and <varargs.h>, vsnprintf()
 * does not work well under one type of include file.
 *
 * Some systems (such as UMIPS) have bugs in the <stdarg.h> implementation
- * that show up in vsprintf(), so we may have to try to use sprintf()
- * as if it were vsprintf() and hope for the best.
+ * that show up in vsnprintf(), so we may have to try to use snprintf()
+ * as if it were vsnprintf() and hope for the best.
 *
- * This program will output #defines and exits 0 if vsprintf() (or sprintf())
- * produces the results that we expect.	 This program exits 1 if vsprintf()
- * (or sprintf()) produces unexpected results while using the <stdarg.h>
+ * This program will output #defines and exits 0 if vsnprintf() (or snprintf())
+ * produces the results that we expect.	 This program exits 1 if vsnprintf()
+ * (or snprintf()) produces unexpected results while using the <stdarg.h>
 * include file.
 */

@@ -57,39 +57,24 @@
 # include <stdlib.h>
 #endif

-#undef VSPRINTF_SIZE_T
+#undef VSNPRINTF_SIZE_T
 #if defined(FORCE_STDC) || (defined(__STDC__) && __STDC__ != 0) || \
    defined(__cplusplus)
-# define VSPRINTF_SIZE_T size_t
+# define VSNPRINTF_SIZE_T size_t
 #else
-# define VSPRINTF_SIZE_T long
+# define VSNPRINTF_SIZE_T long
 #endif

-char buf[BUFSIZ];
+char buf[BUFSIZ+1];


 void
-try_this(char *fmt, ...)
-{
-	va_list ap;
-
-	va_start(ap, fmt);
-#if !defined(DONT_HAVE_VSPRINTF)
-	vsprintf(buf, fmt, ap);
-#else
-	sprintf(buf, fmt, ap);
-#endif
-	va_end(ap);
-}
-
-
-void
-try_nthis(char *fmt, VSPRINTF_SIZE_T size, ...)
+try_nthis(char *fmt, VSNPRINTF_SIZE_T size, ...)
 {
 	va_list ap;

 	va_start(ap, size);
-#if !defined(DONT_HAVE_VSPRINTF)
+#if !defined(DONT_HAVE_VSNPRINTF)
 	vsnprintf(buf, size, fmt, ap);
 #else
 	snprintf(buf, size, fmt, ap);
@@ -106,36 +91,12 @@ main(void)
 	 */
 	buf[0] = '\0';

-	/*
-	 * test variable args and vsprintf/sprintf
-	 */
-	try_this("@%d:%s:%d@", 1, "hi", 2);
-	if (strcmp(buf, "@1:hi:2@") != 0) {
-#if !defined(DONT_HAVE_VSPRINTF)
-	    /* <stdarg.h> with vsprintf() didn't work */
-#else
-	    /* <stdarg.h> with sprintf() simulating vsprintf() didn't work */
-#endif
-	    exit(1);
-	}
-	try_this("%s %d%s%d%d %s",
-	    "Landon Noll 1st coproved that", 2, "^", 21701, -1, "was prime");
-	if (strcmp(buf,
-		   "Landon Noll 1st coproved that 2^21701-1 was prime") != 0) {
-#if !defined(DONT_HAVE_VSPRINTF)
-	    /* <stdarg.h> with vsprintf() didn't work */
-#else
-	    /* <stdarg.h> with sprintf() simulating vsprintf() didn't work */
-#endif
-	    exit(1);
-	}
-
 	/*
 	 * test variable args and vsnprintf/snprintf
 	 */
 	try_nthis("@%d:%s:%d@", sizeof(buf)-1, 1, "hello", 5);
 	if (strcmp(buf, "@1:hello:5@") != 0) {
-#if !defined(DONT_HAVE_VSPRINTF)
+#if !defined(DONT_HAVE_VSNPRINTF)
 	    /* <stdarg.h> with vsnprintf() didn't work */
 #else
 	    /* <stdarg.h> with snprintf() simulating vsnprintf() didn't work */
@@ -146,7 +107,7 @@ main(void)
 	    "Landon Noll 1st proved that", 2, "^", 23209, -1, "was prime");
 	if (strcmp(buf,
 		   "Landon Noll 1st proved that 2^23209-1 was prime") != 0) {
-#if !defined(DONT_HAVE_VSPRINTF)
+#if !defined(DONT_HAVE_VSNPRINTF)
 	    /* <stdarg.h> with vsnprintf() didn't work */
 #else
 	    /* <stdarg.h> with snprintf() simulating vsnprintf() didn't work */
@@ -158,7 +119,7 @@ main(void)
 	 * report the result
 	 */
 	puts("/* what type of variable args do we have? */");
-#if defined(DONT_HAVE_VSPRINTF)
+#if defined(DONT_HAVE_VSNPRINTF)
 	puts("/*");
 	puts(" * SIMULATE_STDARG");
 	puts(" *");
@@ -179,22 +140,21 @@ main(void)
 	puts("#define STDARG /* use <stdarg.h> */");
 	puts("#include <stdarg.h>");
 #endif
-	puts("\n/* should we use vsprintf() and vsnprintf()? */");
-#if !defined(DONT_HAVE_VSPRINTF)
-	puts("#define HAVE_VSPRINTF /* yes */");
+	puts("\n/* should we use vsnprintf() and vsnprintf()? */");
+#if !defined(DONT_HAVE_VSNPRINTF)
+	puts("#define HAVE_VSNPRINTF /* yes */");
 #else
 	puts("/*");
 	puts(" * Hack aleart!!!");
 	puts(" *");
-	puts(" * Systems that do not have vsprintf() need something.  In some");
-	puts(" * cases the sprintf function will deal correctly with the");
-	puts(" * va_alist 3rd arg.  Same gors for a lack of an vsnprintf()");
+	puts(" * Systems that do not have vsnprintf() need something. In some");
+	puts(" * cases the snprintf function will deal correctly with the");
+	puts(" * va_alist 4th arg.  Same gors for a lack of an vsnprintf()");
 	puts(" * function.  In either case we use the #defines below and");
 	puts(" * hope for the best!");
 	puts(" */");
-	puts("#define vsprintf sprintf");
 	puts("#define vsnprintf snprintf");
-	puts("#undef HAVE_VSPRINTF");
+	puts("#undef HAVE_VSNPRINTF");
 #endif
 	/* exit(0); */
 	return 0;
--- a/have_varvs.c
+++ b/have_varvs.c
@@ -1,7 +1,7 @@
 /*
- * have_varvs - try <varargs.h> to see if it really works with vsprintf()
+ * have_varvs - try <varargs.h> to see if it really works with vsnprintf()
 *
- * Copyright (C) 1999  Landon Curt Noll
+ * Copyright (C) 1999,2018  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -26,12 +26,12 @@

 /*
 * Some systems have bugs in the <varargs.h> implementation that show up in
- * vsprintf(), so we may have to try to use sprintf() as if it were vsprintf()
- * and hope for the best.
+ * vsnprintf(), so we may have to try to use snprintf() as if it were
+ * vsnprintf() and hope for the best.
 *
- * This program will output #defines and exits 0 if vsprintf() (or sprintf())
- * produces the results that we expect.	 This program exits 1 if vsprintf()
- * (or sprintf()) produces unexpected results while using the <stdarg.h>
+ * This program will output #defines and exits 0 if vsnprintf() (or snprintf())
+ * produces the results that we expect.	 This program exits 1 if vsnprintf()
+ * (or snprintf()) produces unexpected results while using the <stdarg.h>
 * include file.
 */

@@ -48,43 +48,27 @@
 # include <string.h>
 #endif

-#undef VSPRINTF_SIZE_T
+#undef VSNPRINTF_SIZE_T
 #if defined(FORCE_STDC) || (defined(__STDC__) && __STDC__ != 0) || \
    defined(__cplusplus)
-# define VSPRINTF_SIZE_T size_t
+# define VSNPRINTF_SIZE_T size_t
 #else
-# define VSPRINTF_SIZE_T long
+# define VSNPRINTF_SIZE_T long
 #endif

-char buf[BUFSIZ];
+char buf[BUFSIZ+1];

 #if !defined(STDARG) && !defined(SIMULATE_STDARG)
 #include <varargs.h>

 void
-try_this(char *fmt, ...)
+try_nthis(char *fmt, VSNPRINTF_SIZE_T size, ...)
 {
    va_list ap;

    va_start(ap);

-#if !defined(DONT_HAVE_VSPRINTF)
-    vsprintf(buf, fmt, ap);
-#else
-    sprintf(buf, fmt, ap);
-#endif
-
-    va_end(ap);
-}
-
-void
-try_nthis(char *fmt, VSPRINTF_SIZE_T size, ...)
-{
-    va_list ap;
-
-    va_start(ap);
-
-#if !defined(DONT_HAVE_VSPRINTF)
+#if !defined(DONT_HAVE_VSNPRINTF)
    vsnprintf(buf, size, fmt, ap);
 #else
    snprintf(buf, size, fmt, ap);
@@ -96,13 +80,7 @@ try_nthis(char *fmt, VSPRINTF_SIZE_T size, ...)
 #else

 void
-try_this(char *a, int b, char *c, int d)
-{
-    return;
-}
-
-void
-try_nthis(char *a, VSPRINTF_SIZE_T size, int b, char *c, int d)
+try_nthis(char *a, VSNPRINTF_SIZE_T size, int b, char *c, int d)
 {
    return;
 }
@@ -118,36 +96,12 @@ main(void)
 	 */
 	buf[0] = '\0';

-	/*
-	 * test variable args and vsprintf/sprintf
-	 */
-	try_this("@%d:%s:%d@", 1, "hi", 2);
-	if (strcmp(buf, "@1:hi:2@") != 0) {
-#if !defined(DONT_HAVE_VSPRINTF)
-	    /* <varargs.h> with vsprintf() didn't work */
-#else
-	    /* <varargs.h> with sprintf() simulating vsprintf() didn't work */
-#endif
-	    exit(1);
-	}
-	try_this("%s %d%s%d%d %s",
-	    "Landon Noll 1st proved that", 2, "^", 23209, -1, "was prime");
-	if (strcmp(buf,
-		   "Landon Noll 1st proved that 2^23209-1 was prime") != 0) {
-#if !defined(DONT_HAVE_VSPRINTF)
-	    /* <varargs.h> with vsprintf() didn't work */
-#else
-	    /* <varargs.h> with sprintf() simulating vsprintf() didn't work */
-#endif
-	    exit(1);
-	}
-
 	/*
 	 * test variable args and vsnprintf/snprintf
 	 */
 	try_nthis("@%d:%s:%d@", sizeof(buf)-1, 1, "hello", 5);
 	if (strcmp(buf, "@1:hello:5@") != 0) {
-#if !defined(DONT_HAVE_VSPRINTF)
+#if !defined(DONT_HAVE_VSNPRINTF)
 	    /* <varargs.h> with vsnprintf() didn't work */
 #else
 	    /* <varargs.h> with snprintf() simulating vsnprintf() didn't work */
@@ -158,7 +112,7 @@ main(void)
 	    "Landon Noll 1st proved that", 2, "^", 23209, -1, "was prime");
 	if (strcmp(buf,
 		   "Landon Noll 1st proved that 2^23209-1 was prime") != 0) {
-#if !defined(DONT_HAVE_VSPRINTF)
+#if !defined(DONT_HAVE_VSNPRINTF)
 	    /* <varargs.h> with vsnprintf() didn't work */
 #else
 	    /* <varargs.h> with snprintf() simulating vsnprintf() didn't work */
@@ -172,22 +126,21 @@ main(void)
 	puts("/* what type of variable args do we have? */");
 	puts("#define VARARGS /* use <varargs.h> */");
 	puts("#include <varargs.h>");
-	puts("\n/* should we use vsprintf() and vsnprintf()? */");
-#if !defined(DONT_HAVE_VSPRINTF)
-	puts("#define HAVE_VSPRINTF /* yes */");
+	puts("\n/* should we use vsnprintf() and vsnprintf()? */");
+#if !defined(DONT_HAVE_VSNPRINTF)
+	puts("#define HAVE_VSNPRINTF /* yes */");
 #else
 	puts("/*");
 	puts(" * Hack aleart!!!");
 	puts(" *");
-	puts(" * Systems that do not have vsprintf() need something.  In some");
-	puts(" * cases the sprintf function will deal correctly with the");
-	puts(" * va_alist 3rd arg.  Same gors for a lack of an vsnprintf()");
+	puts(" * Systems that do not have vsnprintf() need something. In some");
+	puts(" * cases the snprintf() function will deal correctly with the");
+	puts(" * va_alist 4th arg.  Same gors for a lack of an vsnprintf()");
 	puts(" * function.  In either case we use the #defines below and");
 	puts(" * hope for the best!");
 	puts(" */");
-	puts("#define vsprintf sprintf");
 	puts("#define vsnprintf snprintf");
-	puts("#undef HAVE_VSPRINTF");
+	puts("#undef HAVE_VSNPRINTF");
 #endif
 	/* exit(0); */
 	return 0;
--- a/help.c
+++ b/help.c
@@ -1,7 +1,7 @@
 /*
 * help - display help for calc
 *
- * Copyright (C) 1999-2007,2014  Landon Curt Noll
+ * Copyright (C) 1999-2007,2014,2018  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -183,6 +183,7 @@ givehelp(char *type)
 	FILE *stream;		/* help file stream */
 	char *helppath;		/* path to the help file */
 	char *c;
+	size_t snprintf_len;	/* malloced snprintf buffer length */

 	/*
 	 * check permissions to see if we are allowed to help
@@ -247,18 +248,21 @@ givehelp(char *type)
 	 */
 #if defined(CUSTOM)
 	if (sizeof(CUSTOMHELPDIR) > sizeof(HELPDIR)) {
-		helppath = (char *)malloc(sizeof(CUSTOMHELPDIR)+1+strlen(type));
+		snprintf_len = sizeof(CUSTOMHELPDIR)+1+strlen(type) + 1;
 	} else {
-		helppath = (char *)malloc(sizeof(HELPDIR)+1+strlen(type));
+		snprintf_len = sizeof(HELPDIR)+1+strlen(type) + 1;
 	}
+	helppath = (char *)malloc(snprintf_len+1);
 #else /* CUSTOM */
-	helppath = (char *)malloc(sizeof(HELPDIR)+1+strlen(type));
+	snprintf_len = sizeof(HELPDIR)+1+strlen(type) + 1;
+	helppath = (char *)malloc(snprintf_len+1);
 #endif /* CUSTOM */
 	if (helppath == NULL) {
 		fprintf(stderr, "malloc failure in givehelp()\n");
 		return;
 	}
-	sprintf(helppath, "%s/%s", HELPDIR, type);
+	snprintf(helppath, snprintf_len, "%s/%s", HELPDIR, type);
+	helppath[snprintf_len] = '\0';	/* paranoia */
 	stream = fopen(helppath, "r");
 	if (stream != NULL) {

@@ -274,7 +278,8 @@ givehelp(char *type)
 	 */
 	} else {

-		sprintf(helppath, "%s/%s", CUSTOMHELPDIR, type);
+		snprintf(helppath, snprintf_len, "%s/%s", CUSTOMHELPDIR, type);
+		helppath[snprintf_len] = '\0';	/* paranoia */
 		stream = fopen(helppath, "r");
 		if (stream == NULL) {

--- a/help/command
+++ b/help/command
@@ -88,6 +88,31 @@ Command sequence
 	If the -m mode disallows opening of files for reading,
 	this command will be disabled.

+	To read a calc resource file without printing various
+	messages about defined functions, the "resource_debug"
+	config should be set to zero.  For example:
+
+	    read lucas;
+
+	will, by default, print messages such as:
+
+	    lucas(h,n) defined
+	    gen_u2(h,n,v1) defined
+	    gen_u0(h,n,v1) defined
+	    rodseth_xhn(x,h,n) defined
+	    gen_v1(h,n) defined
+	    ldebug(funct,str) defined
+	    legacy_gen_v1(h,n) defined
+
+        When "resource_debug" is zero, such messages are silenced.
+
+	    config("resource_debug", 0),;
+	    read lucas;
+
+	To silence such messages on the calc command line, try:
+
+	    calc -p -D :0 'read -once lucas; lucas(1, 23209);'
+

    write calc commands
    -------------------
@@ -350,7 +375,7 @@ Command sequence
 	statement   flow control and declaration statements
 	usage	    how to invoke the calc command and calc -options

-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2018  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/help/config
+++ b/help/config
@@ -949,6 +949,48 @@ EXAMPLE
    ; display()
 	50

+    ; /*
+       * NOTE: When displaying many digits after the decimal point
+       *       be sure to set display(digits) (see 'help display') to
+       *       large enough AND to set epsilon(eps) (see 'help epsilon')
+       *       small enough (or if the function has a esp argument,
+       *       give a eps argument that is small enough) to display
+       *       the value correctly.
+       */
+    ; config("tilde", 1),;
+
+    ; /* NOTE: display has too few digits and epsilon is not small enough */
+    ; config("display", 12),;		/* or display(12),; */
+    ; printf("%f\n", pi(1e-10));
+    3.1415926536
+    ; config("epsilon", 1e-10),;	/* or epsilon(1e-10),; */
+    ; printf("%f\n", pi());
+    3.1415926536
+
+    ; /* NOTE: display has too few digits yet epsilon is small enough */
+    ; config("display", 12),;		/* or display(12),; */
+    ; printf("%f\n", pi(1e-72));
+    ~3.141592653590
+    ; config("epsilon", 1e-72),;	/* or epsilon(1e-72),; */
+    ; printf("%f\n", pi());
+    ~3.141592653590
+
+    ; /* NOTE: display has enough digits but epsilon is not small enough */
+    ; config("display", 72),;		/* or display(72),; */
+    ; printf("%f\n", pi(1e-10));
+    3.1415926536
+    ; config("epsilon", 1e-10),;	/* or epsilon(1e-10),; */
+    ; printf("%f\n", pi());
+    3.1415926536
+
+    /* NOTE: display has enough digits and epsilon is small enough */
+    ; config("display", 72),;		/* or display(72),; */
+    ; printf("%f\n", pi(1e-72));
+    3.141592653589793238462643383279502884197169399375105820974944592307816406
+    ; config("epsilon", 1e-72),;	/* or epsilon(1e-72),; */
+    ; printf("%f\n", pi());
+    3.141592653589793238462643383279502884197169399375105820974944592307816406
+
 LIMITS
    none

@@ -956,9 +998,9 @@ LINK LIBRARY
     n/a

 SEE ALSO
-     usage, custom, custom_cal, usage, epsilon, display
+     custom, custom_cal, display, epsilon, fprintf, printf, strprintf, usage

-## Copyright (C) 1999-2007  Landon Curt Noll
+## Copyright (C) 1999-2007,2018  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/help/display
+++ b/help/display
@@ -45,6 +45,48 @@ EXAMPLE
    ; print display(5), 2/3
    40 ~0.66667

+    ; /*
+       * NOTE: When displaying many digits after the decimal point
+       *       be sure to set display(digits) (see 'help display') to
+       *       large enough AND to set epsilon(eps) (see 'help epsilon')
+       *       small enough (or if the function has a esp argument,
+       *       give a eps argument that is small enough) to display
+       *       the value correctly.
+       */
+    ; config("tilde", 1),;
+
+    ; /* NOTE: display has too few digits and epsilon is not small enough */
+    ; display(12),;
+    ; printf("%f\n", pi(1e-10));
+    3.1415926536
+    ; epsilon(1e-10),;
+    ; printf("%f\n", pi());
+    3.1415926536
+
+    ; /* NOTE: display has too few digits yet epsilon is small enough */
+    ; display(12),;
+    ; printf("%f\n", pi(1e-72));
+    ~3.141592653590
+    ; epsilon(1e-72),;
+    ; printf("%f\n", pi());
+    ~3.141592653590
+
+    ; /* NOTE: display has enough digits but epsilon is not small enough */
+    ; display(72),;
+    ; printf("%f\n", pi(1e-10));
+    3.1415926536
+    ; epsilon(1e-10),;
+    ; printf("%f\n", pi());
+    3.1415926536
+
+    /* NOTE: display has enough digits and epsilon is small enough */
+    ; display(72),;
+    ; printf("%f\n", pi(1e-72));
+    3.141592653589793238462643383279502884197169399375105820974944592307816406
+    ; epsilon(1e-72),;
+    ; printf("%f\n", pi());
+    3.141592653589793238462643383279502884197169399375105820974944592307816406
+
 LIMITS
    d >= 0

@@ -52,9 +94,9 @@ LINK LIBRARY
    none

 SEE ALSO
-    config
+    config, epsilon, fprintf, printf, strprintf

-## Copyright (C) 2004  Landon Curt Noll
+## Copyright (C) 2004,2018  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/help/environment
+++ b/help/environment
@@ -7,7 +7,8 @@ Environment variables

 		/	./	../	~

-	If this variable does not exist, a compiled value
+	If this variable does not exist, or if this
+	variable is an empty string, a compiled value
 	is used.  Typically compiled in value is:

 		    .:./cal:~/cal:${CALC_SHAREDIR}:${CUSTOMCALDIR}
@@ -27,7 +28,8 @@ Environment variables
 	line), calc searches for files along the :-separated
 	$CALCRC environment variable.

-	If this variable does not exist, a compiled value
+	If this variable does not exist, or if this
+        variable is an empty string, a compiled value
 	is used.  Typically compiled in value is:

 		    ${CALC_SHAREDIR}/startup:~/.calcrc:./.calcinit
@@ -66,7 +68,8 @@ Environment variables
 	This value is taken to be the home directory of the
 	current user.  It is used when files begin with '~/'.

-	If this variable does not exist, the home directory password
+	If this variable does not exist, or if this
+	variable is an empty string, the home directory password
 	entry of the current user is used.  If that information
 	is not available, '.' is used.

@@ -75,7 +78,8 @@ Environment variables
 	When invoking help, this environment variable is used
 	to display a help file.

-	If this variable does not exist, a compiled value
+	If this variable does not exist, or if this
+	variable is an empty string, a compiled value
 	is used.  Typically compiled in value is something
 	such as 'more', 'less', 'pg' or 'cat'.

@@ -84,11 +88,20 @@ Environment variables
 	When a !-command is used, the program indicated by
 	this environment variable is used.

-	If this variable does not exist, a compiled value
+	If this variable does not exist, or if this
+	variable is an empty string, a compiled value
 	is used.  Typically compiled in value is something
 	such as 'sh' is used.

-## Copyright (C) 1999  Landon Curt Noll
+    CALCHISTFILE
+
+	This value is taken to be the calc history file.
+
+	If this variable does not exist, or if this
+	variable is an empty string, then ~/.calc_history
+	is used.
+
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/help/epsilon
+++ b/help/epsilon
@@ -16,13 +16,57 @@ DESCRIPTION
    and sets the stored epsilon value to eps.

    The stored epsilon value is used as default value for eps in
-    the functions appr(x, eps, rnd), sqrt(x, eps, rnd), etc.
+    many functions such as appr(x, eps, rnd), sqrt(x, eps, rnd),
+    pi(eps), sin(x, eps), tanh(x, eps), etc.

 EXAMPLE
+    ; epsilon(1e-20),;
    ; oldeps = epsilon(1e-6)
    ; print epsilon(), sqrt(2), epsilon(1e-4), sqrt(2), epsilon(oldeps)
    ; .000001 1.414214 .000001 1.4142 .0001

+    ; /*
+       * NOTE: When displaying many digits after the decimal point
+       *       be sure to set display(digits) (see 'help display') to
+       *       large enough AND to set epsilon(eps) (see 'help epsilon')
+       *       small enough (or if the function has a esp argument,
+       *       give a eps argument that is small enough) to display
+       *       the value correctly.
+       */
+    ; config("tilde", 1),;
+
+    ; /* NOTE: display has too few digits and epsilon is not small enough */
+    ; display(12),;
+    ; printf("%f\n", pi(1e-10));
+    3.1415926536
+    ; epsilon(1e-10),;
+    ; printf("%f\n", pi());
+    3.1415926536
+
+    ; /* NOTE: display has too few digits yet epsilon is small enough */
+    ; display(12),;
+    ; printf("%f\n", pi(1e-72));
+    ~3.141592653590
+    ; epsilon(1e-72),;
+    ; printf("%f\n", pi());
+    ~3.141592653590
+
+    ; /* NOTE: display has enough digits but epsilon is not small enough */
+    ; display(72),;
+    ; printf("%f\n", pi(1e-10));
+    3.1415926536
+    ; epsilon(1e-10),;
+    ; printf("%f\n", pi());
+    3.1415926536
+
+    /* NOTE: display has enough digits and epsilon is small enough */
+    ; display(72),;
+    ; printf("%f\n", pi(1e-72));
+    3.141592653589793238462643383279502884197169399375105820974944592307816406
+    ; epsilon(1e-72),;
+    ; printf("%f\n", pi());
+    3.141592653589793238462643383279502884197169399375105820974944592307816406
+
 LIMITS
    none

@@ -31,9 +75,9 @@ LINK LIBRARY
    NUMBER *_epsilon_

 SEE ALSO
-    config
+    config, display, fprintf, printf, strprintf

-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2018  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/help/fprintf
+++ b/help/fprintf
@@ -45,6 +45,48 @@ EXAMPLE
      [2] = "undefined"
      [3] = NULL

+    ; /*
+       * NOTE: When displaying many digits after the decimal point
+       *       be sure to set display(digits) (see 'help display') to
+       *       large enough AND to set epsilon(eps) (see 'help epsilon')
+       *       small enough (or if the function has a esp argument,
+       *       give a eps argument that is small enough) to display
+       *       the value correctly.
+       */
+    ; config("tilde", 1),;
+
+    ; /* NOTE: display has too few digits and epsilon is not small enough */
+    ; display(12),;
+    ; fprintf(files(1), "%f\n", pi(1e-10));
+    3.1415926536
+    ; epsilon(1e-10),;
+    ; fprintf(files(1), "%f\n", pi());
+    3.1415926536
+
+    ; /* NOTE: display has too few digits yet epsilon is small enough */
+    ; display(12),;
+    ; fprintf(files(1), "%f\n", pi(1e-72));
+    ~3.141592653590
+    ; epsilon(1e-72),;
+    ; fprintf(files(1), "%f\n", pi());
+    ~3.141592653590
+
+    ; /* NOTE: display has enough digits but epsilon is not small enough */
+    ; display(72),;
+    ; fprintf(files(1), "%f\n", pi(1e-10));
+    3.1415926536
+    ; epsilon(1e-10),;
+    ; fprintf(files(1), "%f\n", pi());
+    3.1415926536
+
+    /* NOTE: display has enough digits and epsilon is small enough */
+    ; display(72),;
+    ; fprintf(files(1), "%f\n", pi(1e-72));
+    3.141592653589793238462643383279502884197169399375105820974944592307816406
+    ; epsilon(1e-72),;
+    ; fprintf(files(1), "%f\n", pi());
+    3.141592653589793238462643383279502884197169399375105820974944592307816406
+
 LIMITS
    The number of arguments of fprintf() is not to exceed 1024.

@@ -52,9 +94,9 @@ LINK LIBRARY
    none

 SEE ALSO
-    printf, strprintf, print
+    config, display, epsilon, printf, strprintf

-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2018  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/help/intro
+++ b/help/intro
@@ -15,7 +15,7 @@ What is calc?

    	    15

-    Calc as the usual collection of arithmetic operators +, -, /, *
+    Calc has the usual collection of arithmetic operators +, -, /, *
    as well as ^ (exponentiation), % (modulus) and // (integer divide).
    For example:

@@ -137,7 +137,7 @@ What is calc?

 	    f2(79)

-    will produce;
+    will produce:

 	    1009847364737869270905302433221592504062302663202724609375

@@ -150,7 +150,7 @@ What is calc?

 	    sc(31, 61)

-    will produce;
+    will produce:

 	    256772

--- a/help/mat
+++ b/help/mat
@@ -54,13 +54,13 @@ DESCRIPTION
    The elements of the matrix are stored internally as a linear array
    in which locations are arranged in order of increasing indices.
    For example, in order of location, the six element of A = mat [2,3]
-    are
+    are:

-	A[0,0], A[0,1], A[0,2], A[1,0], A[1,,1], A[1,2].
+	A[0,0], A[0,1], A[0,2], A[1,0], A[1,1], and A[1,2].

    These elements may also be specified using the double-bracket operator
    with a single integer index as in A[[0]], A[[1]], ..., A[[5]].
-    If p is assigned the value &A[0.0], the address of A[[i]] for 0 <= i < 6
+    If p is assigned the value &A[0,0], the address of A[[i]] for 0 <= i < 6
    is p + i as long as A exists and a new value is not assigned to A.

    When a matrix is created, each element is initially assigned the
@@ -414,7 +414,7 @@ SEE ALSO
    det, inverse, isident, test, config, search, rsearch, reverse, copy,
    blkcpy, dp, cp, randperm, sort

-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2018  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/help/power
+++ b/help/power
@@ -6,7 +6,7 @@ SYNOPSIS

 TYPES
    x		number
-    x		number
+    y		number
    eps		nonzero real, defaults to epsilon()

    return	number
--- a/help/printf
+++ b/help/printf
@@ -28,7 +28,7 @@ DESCRIPTION
 	    zero or more decimal digits
 	    an optional '. followed by zero or more decimal deigits
 	    an optional 'l'
-	    one of the letters: d, s, c, f, e, r, o, x, b,
+	    one of the letters: d, s, c, f, e, g, r, o, x, b,

    If any other character is read, the '%' and any characters
    between '%' and the character are ignored and no specifier is
@@ -51,26 +51,39 @@ DESCRIPTION
 	    d, s, c		current config("mode")
 	    f		real (decimal, floating point)
 	    e		exponential
+	    g		general format (real or exponential)
 	    r		fractional
 	    o		octal
 	    x		hexadecimal
 	    b		binary

-    If the number of arguments after fmt is less than the
-    number of format specifiers in fmt, the "missing" arguments
-    may be taken to be null values - these contribute nothing to the
-    output; if a positive width w has been specified, the effect is
-    to produce w spaces, e.g. printf("abc%6dxyz") prints "abc	   xyz".
+    If the number of arguments after fmt is less than the number
+    of format specifiers in fmt, the "missing" arguments may be
+    taken to be null values - these contribute nothing to the output;
+    if a positive width w has been specified, the effect is to
+    produce w spaces, e.g., printf("abc%6dxyz") prints "abc      xyz".

-    If i <= the number of specifiers in fmt, the value of argument x_i
-    is printed in the format specified by the i-th specifier.
-    If a positive width w has been specified and normal printing of x_i
-    does not include a '\n' character, what is printed will if necessary
-    be padded with spaces so that the length of the printed output
-    is at least the w.	Note that control
-    characters like '\t', '\b' each count as one character.  If
-    the 'right-pad' flag has been set, the padding is on the right;
-    otherwise it is on the left.
+    Control charters may be given in fmt by escaping them with
+    the \ character.  The following control charter escape
+    sequences are recognized:
+
+	\a	audible bell	byte 0x07 in ASCII encoding
+	\b	backspace	byte 0x08 in ASCII encoding
+	\f	form feed	byte 0x0c in ASCII encoding
+	\n	newline		byte 0x0b in ASCII encoding
+	\r	return		byte 0x0a in ASCII encoding
+	\t	tab		byte 0x0d in ASCII encoding
+	\v	vertical tab	byte 0x09 in ASCII encoding
+
+    If i <= the number of specifiers in fmt, the value of argument
+    x_i is printed in the format specified by the i-th specifier.
+    If a positive width w has been specified and normal printing
+    of x_i does not include a '\n' character, what is printed will
+    if necessary be padded with spaces so that the length of the
+    printed output is at least the w.  Note that control characters
+    (e.g., '\a', '\b', '\f', '\n', '\r', '\t', '\n') count as one
+    character.  If the 'right-pad' flag has been set, the padding
+    is on the right; otherwise it is on the left.

    If i > the number of specifiers in fmt, the value of argument x_i
    does not contribute to the printing.  However, as all arguments
@@ -83,22 +96,38 @@ DESCRIPTION
    specified precision will be ignored except for floating-point
    mode.

-    In the case of floating-point (f) format the precision determines
-    the maximum number of decimal places to be
-    displayed.	Other aspects of this printing may be affected by the
-    configuration parameters "outround", "tilde", "fullzero", "leadzero".
+    The (g) general format will print the as real (f) (decimal or
+    floating point) or as an exponential (e) depending on the
+    configuration parameter "display".
+
+    In the case of floating-point (f) format, and the (g) general
+    format, the precision determines the maximum number of decimal
+    places to be displayed.  Other aspects of this printing may be
+    affected by the configuration parameters "outround", "tilde",
+    "fullzero", "leadzero".

 EXAMPLE
-    ; c = config("epsilon", 1e-6); c = config("display", 6);
-    ; c = config("tilde", 1); c = config("outround", 0);
-    ; c = config("fullzero", 0);
+    ; config("epsilon", 1e-6),;
+    : config("display", 6),;
+    ; config("tilde", 1),;
+    ; config("outround", 0),;
+    ; config("fullzero", 0),;
    ; fmt = "%f,%10f,%-10f,%10.4f,%.4f,%.f.\n";
    ; a = sqrt(3);
    ; printf(fmt,a,a,a,a,a,a);
    1.732051,  1.732051,1.732051  ,   ~1.7320,~1.7320,~1.

-    ; c = config("tilde", 0); c = config("outround",24);
-    ; c = config("fullzero", 1);
+    ; config("display", 5),;
+    : config("tilde", 0),;
+    ; printf("%f\n", pi());
+    3.1416
+    ; config("display", 10),;
+    ; printf("%f\n", pi());
+    3.141592654
+
+    ; config("tilde", 0),;
+    : config("outround",24),;
+    ; config("fullzero", 1),;
    ; printf(fmt,a,a,a,a,a,a);
    1.732051,  1.732051,1.732051  ,    1.7321,1.7321,2.

@@ -116,6 +145,82 @@ EXAMPLE
      [2] = "undefined"
      [3] = NULL

+    ; config("display", 50),;
+    ; printf("%g %g\n%g %g\n", 1e5, 1e49, 1e50, 1e500);
+    100000 100000000000000000000000000000000000000000000000000
+    1e50 1e500
+
+    ; config("display", 10),;
+    : config("tilde", 0),;
+    ; printf("%f %f %f\n%f %f %f\n",
+             exp(1), exp(2), exp(3), exp(4), exp(5), exp(6));
+    2.7182818285 7.3890560989 20.0855369232
+    54.5981500331 148.4131591026 403.4287934927
+    ; printf("%e %e %e\n%e %e %e\n",
+             exp(1), exp(2), exp(3), exp(4), exp(5), exp(6));
+    2.7182818285 7.3890560989 2.0085536923e1
+    5.4598150033e1 1.4841315910e2 4.0342879349e2
+    ; printf("%g %g %g\n%g %g %g\n",
+             exp(1), exp(2), exp(3), exp(4), exp(5), exp(6));
+    2.718281828 7.389056099 20.08553692
+    54.59815003 148.4131591 403.4287935
+
+    ; config("display", 10),;
+    ; config("tilde", 0),;
+    ; printf("%f %f %f\n%f %f %f\n",
+             exp(20), exp(21), exp(22), exp(23), exp(24), exp(25));
+    485165195.4097902780 1318815734.4832146972 3584912846.1315915617
+    9744803446.2489026000 26489122129.8434722941 72004899337.3858725242`
+    ; printf("%e %e %e\n%e %e %e\n",
+             exp(20), exp(21), exp(22), exp(23), exp(24), exp(25));
+    4.8516519541e8 1.3188157345e9 3.5849128461e9
+    9.7448034462e9 2.6489122130e10 7.2004899337e10
+    ; printf("%g %g %g\n%g %g %g\n",
+             exp(20), exp(21), exp(22), exp(23), exp(24), exp(25));
+    485165195.4 1318815734 3584912846
+    9744803446 2.648912213e10 7.200489934e10
+
+    ; /*
+       * NOTE: When displaying many digits after the decimal point
+       *       be sure to set display(digits) (see 'help display') to
+       *       large enough AND to set epsilon(eps) (see 'help epsilon')
+       *       small enough (or if the function has a esp argument,
+       *       give a eps argument that is small enough) to display
+       *       the value correctly.
+       */
+    ; config("tilde", 1),;
+
+    ; /* NOTE: display has too few digits and epsilon is not small enough */
+    ; display(12),;
+    ; printf("%f\n", pi(1e-10));
+    3.1415926536
+    ; epsilon(1e-10),;
+    ; printf("%f\n", pi());
+    3.1415926536
+
+    ; /* NOTE: display has too few digits yet epsilon is small enough */
+    ; display(12),;
+    ; printf("%f\n", pi(1e-72));
+    ~3.141592653590
+    ; epsilon(1e-72),;
+    ; printf("%f\n", pi());
+    ~3.141592653590
+
+    ; /* NOTE: display has enough digits but epsilon is not small enough */
+    ; display(72),;
+    ; printf("%f\n", pi(1e-10));
+    3.1415926536
+    ; epsilon(1e-10),;
+    ; printf("%f\n", pi());
+    3.1415926536
+
+    /* NOTE: display has enough digits and epsilon is small enough */
+    ; display(72),;
+    ; printf("%f\n", pi(1e-72));
+    3.141592653589793238462643383279502884197169399375105820974944592307816406
+    ; epsilon(1e-72),;
+    ; printf("%f\n", pi());
+    3.141592653589793238462643383279502884197169399375105820974944592307816406

 LIMITS
    The number of arguments of printf() is not to exceed 1024.
@@ -124,9 +229,9 @@ LINK LIBRARY
    none

 SEE ALSO
-    fprintf, strprintf, print
+    config, display, epsilon, fprintf, strprintf

-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2018  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/help/randbit
+++ b/help/randbit
@@ -1,5 +1,5 @@
 NAME
-    randbit - additive 55 shuffle pseudo-random number generator
+    randbit - subtractive 100 shuffle pseudo-random number generator

 SYNOPSIS
    randbit([x])
@@ -42,7 +42,7 @@ LINK LIBRARY
 SEE ALSO
    seed, srand, randbit, isrand, random, srandom, israndom

-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2018  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/help/seed
+++ b/help/seed
@@ -18,14 +18,7 @@ DESCRIPTION
 	It should be pointed out that the information collected by seed
 	is almost certainly non-chaotic.  This function is likely not
 	suitable for applications (such as cryptographic applications)
-	where the unpredictability of seeds is critical.  For such critical
-	applications, LavaRnd should be used.	See the URL:
-
-		http://www.LavaRnd.org/
-
-	for information about seeding a pseudo-random number generator
-	(such as rand() or random()) with the cryptographic hash of the
-	digitization of chaotic system.
+	where the unpredictability of seeds is critical.

    Given the above warning, this builtin function produces a seed that is
    suitable for most applications that desire a different pseudo-random
@@ -51,7 +44,7 @@ LINK LIBRARY
 SEE ALSO
    seed, srand, randbit, isrand, rand, random, srandom, israndom

-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2018  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/help/srandom
+++ b/help/srandom
@@ -332,13 +332,13 @@ LIMITS
    iq >= 2^16

 LINK LIBRARY
-    RAND *zsrandom(ZVALUE *pseed, MATRIX *pmat55)
-    RAND *zsetrandom(RAND *state)
+    RANDOM *zsrandom(ZVALUE *pseed, MATRIX *pmat55)
+    RANDOM *zsetrandom(RAND *state)

 SEE ALSO
    seed, srand, randbit, isrand, random, srandom, israndom

-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2018  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/help/str
+++ b/help/str
@@ -37,7 +37,7 @@ LIMITS

 LINK LIBRARY
    void math_divertio();
-    qprintnum(NUMBER *x, int outmode);
+    qprintnum(NUMBER *x, int outmode, LEN outdigits);
    char *math_getdivertedio();

    math_divertio();
@@ -47,7 +47,7 @@ LINK LIBRARY
 SEE ALSO
    base, base2, config

-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2018  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/help/strprintf
+++ b/help/strprintf
@@ -18,15 +18,68 @@ EXAMPLE
    ; strprintf("h=%d, i=%d", 2, 3);
 	    "h=2, i=3"

-    ; c = config("epsilon", 1e-6); c = config("display", 6);
-    ; c = config("tilde", 1); c = config("outround", 0);
-    ; c = config("fullzero", 0);
+    ; config("epsilon", 1e-6),;
+    ; config("display", 6),;
+    ; config("tilde", 1),;
+    ; config("outround", 0),;
+    ; config("fullzero", 0),;
    ; fmt = "%f,%10f,%-10f,%10.4f,%.4f,%.f.\n";
    ; a = sqrt(3);
    ; strprintf(fmt,a,a,a,a,a,a);
 	    "1.732051,	1.732051,1.732051  ,   ~1.7320,~1.7320,~1.
    "

+    ; config("display", 50),;
+    ; fmt2 = "%g %g\n%g %g\n"
+    ; strprintf(fmt2, 1e5, 1e49, 1e50, 1e500);
+	    "100000 100000000000000000000000000000000000000000000000000
+    1e50 1e500
+    "
+
+    ; /*
+       * NOTE: When displaying many digits after the decimal point
+       *       be sure to set display(digits) (see 'help display') to
+       *       large enough AND to set epsilon(eps) (see 'help epsilon')
+       *       small enough (or if the function has a esp argument,
+       *       give a eps argument that is small enough) to display
+       *       the value correctly.
+       */
+    ; config("tilde", 1),;
+    ; config("tab", 0),;
+    ; fmt1 = "%f";
+
+    ; /* NOTE: display has too few digits and epsilon is not small enough */
+    ; display(12),;
+    ; strprintf(fmt1, pi(1e-10));
+    "3.1415926536"
+    ; epsilon(1e-10),;
+    ; strprintf(fmt1, pi());
+    "3.1415926536"
+
+    ; /* NOTE: display has too few digits yet epsilon is small enough */
+    ; display(12),;
+    ; strprintf(fmt1, pi(1e-72));
+    "~3.141592653590"
+    ; epsilon(1e-72),;
+    ; strprintf(fmt1, pi());
+    ~3.141592653590
+
+    ; /* NOTE: display has enough digits but epsilon is not small enough */
+    ; display(72),;
+    ; strprintf(fmt1, pi(1e-10));
+    "3.1415926536"
+    ; epsilon(1e-10),;
+    ; strprintf(fmt1, pi());
+    "3.1415926536"
+
+    /* NOTE: display has enough digits and epsilon is small enough */
+    ; display(72),;
+    ; strprintf(fmt1, pi(1e-72));
+    "3.141592653589793238462643383279502884197169399375105820974944592307816406"
+    ; epsilon(1e-72),;
+    ; strprintf(fmt1, pi());
+    "3.141592653589793238462643383279502884197169399375105820974944592307816406"
+
 LIMITS
    The number of arguments of strprintf() is not to exceed 1024.

@@ -34,12 +87,11 @@ LINK LIBRARY
    none

 SEE ALSO
-    strcat, strcpy, strerror, strlen, strncmp, strncpy, strpos,
-    strscan, strscanf, substr,
+    config, display, epsilon, fprintf, strcat, strcpy, strerror,
+    strlen, strncmp, strncpy, strpos, strscan, strscanf, substr,
+    printf

-    printf, fprintf, print
-
-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2018  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/help/types
+++ b/help/types
@@ -1,6 +1,6 @@
 Builtin types

-    The calculator has the following built-in types.
+    The calculator has the following built-in types:

    null value
 	    This is the undefined value type.  The function 'null'
@@ -101,7 +101,20 @@ Builtin types
 	    using the result of the 'files' function.  Such copies are
 	    indistinguishable from each other.

-## Copyright (C) 1999  Landon Curt Noll
+    The calculator also has a number of special types that as used
+    by some special builtin functions:
+
+    rand
+	    A subtractive 100 shuffle pseudo-random number generator
+	    state.  This state is used by functions such as isrand()
+	    and srand().
+
+    random
+	    A Blum-Blum-Shub pseudo-random number generator state.
+	    This state is used by functions such as israndom() and
+	    srandom().
+
+## Copyright (C) 1999,2018  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/hist.c
+++ b/hist.c
@@ -51,6 +51,7 @@
 #endif

 #include "calc.h"
+#include "lib_calc.h"
 #include "hist.h"
 #include "have_string.h"

@@ -1461,9 +1462,6 @@ quit_calc(void)
 */


-/* name of history file */
-char *my_calc_history = NULL;
-
 size_t
 hist_getline(char *prompt, char *buf, size_t len)
 {
@@ -1504,8 +1502,8 @@ my_stifle_history (void)
 	/* only save last number of entries */
 	stifle_history(HISTORY_LEN);

-	if (my_calc_history)
-		write_history(my_calc_history);
+	if (calc_history)
+		write_history(calc_history);
 }


@@ -1519,10 +1517,12 @@ hist_init(char UNUSED *filename)
 	using_history();

 	/* name of history file */
-	my_calc_history = tilde_expand("~/.calc_history");
+	if (calc_history == NULL) {
+		calc_history = tilde_expand("~/.calc_history");
+	}

 	/* read previous history */
-	read_history(my_calc_history);
+	read_history(calc_history);

 	atexit(my_stifle_history);

--- a/hist.h
+++ b/hist.h
@@ -36,7 +36,7 @@
 #endif

 #ifndef HIST_SIZE
-#define HIST_SIZE		(1024*10)
+#define HIST_SIZE		(1024*32)
 #endif


--- a/input.c
+++ b/input.c
@@ -1,7 +1,7 @@
 /*
 * input - nested input source file reader
 *
- * Copyright (C) 1999-2007,2014  David I. Bell
+ * Copyright (C) 1999-2007,2014,2018  David I. Bell
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -59,8 +59,8 @@ E_FUNC FILE *f_open(char *name, char *mode);
 E_FUNC FILE *curstream(void);


-#define TTYSIZE		100	/* reallocation size for terminal buffers */
-#define MAXDEPTH		10	/* maximum depth of input */
+#define TTYSIZE		8191	/* reallocation size for terminal buffers */
+#define MAXDEPTH	255	/* maximum depth of input */
 #define IS_READ		1	/* reading normally */
 #define IS_REREAD	2	/* reread current character */
 #define chartoint(ch)	((ch) & 0xff)	/* make sure char is not negative */
@@ -410,6 +410,7 @@ homeexpand(char *name)
 	char *after;		/* after the ~user or ~ */
 	char *username;		/* extracted username */
 	size_t fullpath_len;	/* length of fullpath */
+	size_t snprintf_len;	/* malloced snprintf buffer length */

 	/* firewall */
 	if (name[0] != HOMECHAR)
@@ -466,11 +467,13 @@ homeexpand(char *name)
 	/*
 	 * build the fullpath given the home directory
 	 */
-	fullpath = (char *)malloc(strlen(home2)+strlen(after)+1);
+	snprintf_len = strlen(home2)+strlen(after) + 1;
+	fullpath = (char *)malloc(snprintf_len+1);
 	if (fullpath == NULL) {
 		return NULL;
 	}
-	sprintf(fullpath, "%s%s", home2, after);
+	snprintf(fullpath, snprintf_len, "%s%s", home2, after);
+	fullpath[snprintf_len] = '\0';	/* paranoia */
 	return fullpath;
 #endif /* Windoz free systems */
 }
@@ -789,7 +792,7 @@ ttychar(void)
 {
 	int ch;			/* current char */
 	int len;		/* length of current command */
-	STATIC char charbuf[1024];
+	STATIC char charbuf[256*1024];

 	/*
 	 * If we have more to read from the saved command line, then do that.
--- a/lib_calc.c
+++ b/lib_calc.c
@@ -1,7 +1,7 @@
 /*
 * lib_calc - calc link library initialization and shutdown routines
 *
- * Copyright (C) 1999-2007  Landon Curt Noll
+ * Copyright (C) 1999-2007,2018  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -145,6 +145,7 @@ char *calcbindings = NULL;	/* $CALCBINDINGS or default */
 char *home = NULL;		/* $HOME or default */
 char *pager = NULL;		/* $PAGER or default */
 char *shell = NULL;		/* $SHELL or default */
+char *calc_history = NULL;	/* $CALCHISTFILE or ~/.calc_history */
 int stdin_tty = FALSE;		/* TRUE if stdin is a tty */
 int havecommands = FALSE;	/* TRUE if have one or more cmd args */
 long stoponerror = 0;		/* >0 => stop, <0 => continue, ==0 => use -c */
@@ -504,22 +505,36 @@ initenv(void)
 	home = (c ? strdup(c) : NULL);
 #if defined(_WIN32)
 	if (home == NULL || home[0] == '\0') {
+		/* free home if it was previously allocated, but empty */
+		if (home != NULL) {
+			free(home);
+		}
 		/* just assume . is home if all else fails */
-		home = ".";
+		home = strdup(".");
 	}
 #else /* Windoz free systems */
 	if (home == NULL || home[0] == '\0') {
-		size_t pw_dir_len;
-		ent = (struct passwd *)getpwuid(geteuid());
-		if (ent == NULL) {
-			/* just assume . is home if all else fails */
-			home = ".";
+		/* free home if it was previously allocated, but empty */
+		if (home != NULL) {
+			free(home);
+		}
+		/* try using the home directory of current effective UID */
+		ent = (struct passwd *)getpwuid(geteuid());
+		if (ent == NULL || ent->pw_dir == NULL ||
+		    ent->pw_dir[0] == '\0') {
+			/* just assume . is home if all else fails */
+			home = strdup(".");
+		} else {
+			/* use home directory of current effective UID */
+			home = strdup(ent->pw_dir);
 		}
-		pw_dir_len = strlen(ent->pw_dir);
-		home = (char *)malloc(pw_dir_len+1);
-		strncpy(home, ent->pw_dir, pw_dir_len+1);
 	}
 #endif /* Windoz free systems */
+	/* paranoia */
+	if (home == NULL) {
+		math_error("Unable to allocate string for $HOME");
+		/*NOTREACHED*/
+	}

 	/* determine the $PAGER value */
 	c = (no_env ? NULL : getenv(PAGER));
@@ -532,6 +547,12 @@ initenv(void)
 	shell = (c ? strdup(c) : NULL);
 	if (shell == NULL || *shell == '\0')
 		shell = DEFAULTSHELL;
+
+	/* determine the $CALCHISTFILE value */
+	c = (no_env ? NULL : getenv(CALCHISTFILE));
+	calc_history = (c ? strdup(c) : NULL);
+	if (calc_history == NULL || *calc_history == '\0')
+		calc_history = NULL;	/* will use ~/.calc_history */
 }


--- a/lib_calc.h
+++ b/lib_calc.h
@@ -74,4 +74,9 @@ EXTERN int calc_print_scanwarn_msg;
 /* number of parse/scan warnings found */
 EXTERN unsigned long calc_warn_cnt;

+/*
+ * calc history file
+ */
+EXTERN char *calc_history;
+
 #endif /* !INCLUDE_MATH_ERROR_H */
--- a/longbits.c
+++ b/longbits.c
@@ -92,12 +92,6 @@
 # include <stdlib.h>
 #endif

-#if defined(__linux)
-# if !defined(isascii)
-   E_FUNC int isascii(int c);
-# endif /* !isascii */
-#endif /* __linux */
-
 char *program;		/* our name */

 int
--- a/math_error.c
+++ b/math_error.c
@@ -83,7 +83,7 @@ math_error(char *fmt, ...)
 #endif
 	vsnprintf(calc_err_msg, MAXERROR, fmt, ap);
 	va_end(ap);
-	calc_err_msg[MAXERROR] = '\0';
+	calc_err_msg[MAXERROR] = '\0';	/* paranoia */

 	/*
 	 * if we should longjmp, so do
--- a/opcodes.c
+++ b/opcodes.c
@@ -4104,6 +4104,7 @@ freenumbers(FUNC *fp)
 			case OP_QUIT:
 				freestringconstant(
 				    (long)fp->f_opcodes[pc]);
+				break;
 			}
 			/*FALLTHRU*/
 		case OPLOC:
--- a/qio.c
+++ b/qio.c
@@ -62,12 +62,13 @@ qprintf(char *fmt, ...)
 			if (ch == '\\') {
 				ch = *fmt++;
 				switch (ch) {
+				case 'a': ch = '\a'; break;
+				case 'b': ch = '\b'; break;
+				case 'f': ch = '\f'; break;
 				case 'n': ch = '\n'; break;
 				case 'r': ch = '\r'; break;
 				case 't': ch = '\t'; break;
-				case 'f': ch = '\f'; break;
 				case 'v': ch = '\v'; break;
-				case 'b': ch = '\b'; break;
 				case 0:
 					va_end(ap);
 					return;
@@ -97,6 +98,15 @@ qprintf(char *fmt, ...)
 			q = va_arg(ap, NUMBER *);
 			qprintfe(q, width, precision);
 			break;
+		case 'g':
+			q = va_arg(ap, NUMBER *);
+			/* XXX - we need a qprintfg function */
+#if 0	/* XXX - we need a qprintfg() function */
+			qprintfg(q, width, precision);
+#else	/* XXX - use qprintfe until we have a qprintfg() function */
+			qprintfe(q, width, precision);
+#endif	/* XXX - we need a qprintfg() function */
+			break;
 		case 'r':
 		case 'R':
 			q = va_arg(ap, NUMBER *);
@@ -134,6 +144,7 @@ qprintf(char *fmt, ...)
 		case '-':
 			sign = -1;
 			ch = *fmt++;
+			/*FALLTHRU*/
 		default:
 			if (('0' <= ch && ch <= '9') ||
 			    ch == '.' || ch == '*') {
@@ -174,7 +185,7 @@ qprintf(char *fmt, ...)
 * Integers are always printed as themselves.
 */
 void
-qprintnum(NUMBER *q, int outmode)
+qprintnum(NUMBER *q, int outmode, LEN outdigits)
 {
 	NUMBER tmpval;
 	long prec, exp;
@@ -193,13 +204,13 @@ qprintnum(NUMBER *q, int outmode)

 	case MODE_REAL:
 		prec = qdecplaces(q);
-		if ((prec < 0) || (prec > conf->outdigits)) {
+		if ((prec < 0) || (prec > outdigits)) {
 			if (conf->tilde_ok)
 			    PUTCHAR('~');
 		}
 		if (conf->fullzero || (prec < 0) ||
-		    (prec > conf->outdigits))
-			prec = conf->outdigits;
+		    (prec > outdigits))
+			prec = outdigits;
 		qprintff(q, 0L, prec);
 		break;

@@ -216,7 +227,7 @@ qprintnum(NUMBER *q, int outmode)
 		tmpval.num.sign = 0;
 		exp = qilog10(&tmpval);
 		if (exp == 0) {		/* in range to output as real */
-			qprintnum(q, MODE_REAL);
+			qprintnum(q, MODE_REAL, outdigits);
 			return;
 		}
 		tmpval.num = _one_;
@@ -228,11 +239,25 @@ qprintnum(NUMBER *q, int outmode)
 		q = qmul(q, &tmpval);
 		zfree(tmpval.num);
 		zfree(tmpval.den);
-		qprintnum(q, MODE_REAL);
+		qprintnum(q, MODE_REAL, outdigits);
 		qfree(q);
 		PRINTF1("e%ld", exp);
 		break;

+	case MODE_REAL_AUTO:
+	{
+		const int P = conf->outdigits ? conf->outdigits : 1;
+		tmpval = *q;
+		tmpval.num.sign = 0;
+		exp = qilog10(&tmpval);
+		if (P > exp && exp >= -P) {
+			qprintnum(q, MODE_REAL, P - 1 - exp);
+		} else {
+			qprintnum(q, MODE_EXP, P - 1);
+		}
+		break;
+	}
+
 	case MODE_HEX:
 		qprintfx(q, 0L);
 		break;
@@ -252,7 +277,7 @@ qprintnum(NUMBER *q, int outmode)

 	if (outmode2 != MODE2_OFF) {
 		PUTSTR(" /* ");
-		qprintnum(q, outmode2);
+		qprintnum(q, outmode2, outdigits);
 		PUTSTR(" */");
 	}
 }
--- a/qmath.h
+++ b/qmath.h
@@ -67,7 +67,7 @@ E_FUNC FULL qtou(NUMBER *q);
 E_FUNC SFULL qtos(NUMBER *q);
 E_FUNC long qparse(char *str, int flags);
 E_FUNC void qfreenum(NUMBER *q);
-E_FUNC void qprintnum(NUMBER *q, int mode);
+E_FUNC void qprintnum(NUMBER *q, int mode, LEN outdigits);
 E_FUNC void qprintff(NUMBER *q, long width, long precision);
 E_FUNC void qprintfe(NUMBER *q, long width, long precision);
 E_FUNC void qprintfr(NUMBER *q, long width, BOOL force);
@@ -254,7 +254,9 @@ E_FUNC NUMBER *swap_HALF_in_NUMBER(NUMBER *dest, NUMBER *src, BOOL all);
 #define qhighbit(q)	(zhighbit((q)->num))
 #define qlowbit(q)	(zlowbit((q)->num))
 #define qdivcount(q1, q2)	(zdivcount((q1)->num, (q2)->num))
-#define qlink(q)	((q)->links++, (q))
+/* operation on #q may be undefined, so replace with an inline-function */
+/* was: #define qlink(q)	((q)->links++, (q)) */
+static inline NUMBER* qlink(NUMBER* q) { if(q) { (q)->links++; } return q; }

 #define qfree(q)	{if (--((q)->links) <= 0) qfreenum(q);}

--- a/qmod.c
+++ b/qmod.c
@@ -404,7 +404,7 @@ showredcdata(void)
 	for (i = 0, rcp = redc_cache; i < MAXREDC; i++, rcp++) {
 		if (rcp->age > 0) {
 			printf("%-8ld%-8ld", i, rcp->age);
-			qprintnum(rcp->rnum, 0);
+			qprintnum(rcp->rnum, 0, conf->outdigits);
 			printf("\n");
 		}
 	}
--- a/sha1.c
+++ b/sha1.c
@@ -684,7 +684,7 @@ sha1_print(HASH *state)
 		 *	 the last full update or finalization.	Thus it
 		 *	 may NOT be the actual hash value.
 		 */
-		sprintf(buf,
+		snprintf(buf, DEBUG_SIZE,
 			"sha1: 0x%08x%08x%08x%08x%08x data: %d octets",
 			(int)state->h_union.h_sha1.digest[0],
 			(int)state->h_union.h_sha1.digest[1],
@@ -692,6 +692,7 @@ sha1_print(HASH *state)
 			(int)state->h_union.h_sha1.digest[3],
 			(int)state->h_union.h_sha1.digest[4],
 			(int)state->h_union.h_sha1.datalen);
+		buf[DEBUG_SIZE] = '\0';	/* paranoia */
 		math_str(buf);
 	} else {
 		math_str("sha1 hash state");
--- a/str.c
+++ b/str.c
@@ -1380,17 +1380,17 @@ printechar(char *c)
 	math_chr('\\');
 	ech = 0;
 	switch (ch) {
+	case '\a': ech = 'a'; break;
+	case '\b': ech = 'b'; break;
+	case '\f': ech = 'f'; break;
 	case '\n': ech = 'n'; break;
 	case '\r': ech = 'r'; break;
 	case '\t': ech = 't'; break;
-	case '\b': ech = 'b'; break;
-	case '\f': ech = 'f'; break;
 	case '\v': ech = 'v'; break;
 	case '\\': ech = '\\'; break;
 	case '\"': ech = '\"'; break;
 	case '\'': ech = '\''; break;
 	case 0: ech = '0'; break;
-	case 7: ech = 'a'; break;
 	case 27: ech = 'e'; break;
 	}
 	if (ech == '0') {
@@ -1438,8 +1438,17 @@ fitstring(char *str, long len, long width)
 			continue;
 		n++;
 		switch (ch) {
-		case '\n': case '\r': case '\t': case '\b': case '\f':
-		case '\v': case '\\': case '\"': case 7: case 27:
+		case '\a':
+		case '\b':
+		case '\f':
+		case '\n':
+		case '\r':
+		case '\t':
+		case '\v':
+		case '\\':
+		case '\"':
+		case '\'':
+		case 27:
 			continue;
 		}
 		if (ch >= 64 || (nch >= '0' && nch <= '7')) {
--- a/token.c
+++ b/token.c
@@ -183,10 +183,12 @@ gettoken(void)
 		}
 		switch (ch) {
 		case ' ':
-		case '\t':
-		case '\r':
-		case '\v':
+		case '\a':
+		case '\b':
 		case '\f':
+		case '\r':
+		case '\t':
+		case '\v':
 		case '\0':
 			break;
 		case '\n':
@@ -445,6 +447,7 @@ eatstring(int quotechar)
 		case '\n':
 			if (!newlines)
 				break;
+			/*FALLTHRU*/
 		case EOF:
 			reread();
 			scanerror(T_NULL,
@@ -718,7 +721,7 @@ scanerror(int skip, char *fmt, ...)
 	if (name) {
 		snprintf(calc_err_msg, MAXERROR, "\"%s\", line %ld: ",
 			 name, linenumber());
-		calc_err_msg[MAXERROR] = '\0';	/* firewall */
+		calc_err_msg[MAXERROR] = '\0';	/* paranoia */
 		len = strlen(calc_err_msg);
 		if (len < MAXERROR) {
 			vsnprintf(calc_err_msg+len, MAXERROR-len, fmt, ap);
@@ -727,7 +730,7 @@ scanerror(int skip, char *fmt, ...)
 		vsnprintf(calc_err_msg, MAXERROR, fmt, ap);
 	}
 	va_end(ap);
-	calc_err_msg[MAXERROR] = '\0';
+	calc_err_msg[MAXERROR] = '\0';	/* paranoia */

 	/* print error message if allowed */
 	if (calc_print_scanerr_msg != 0) {
@@ -782,7 +785,7 @@ scanerror(int skip, char *fmt, ...)
 	default:
 		snprintf(calc_err_msg, MAXERROR,
 			 "Unknown skip token for scanerror\n");
-		calc_err_msg[MAXERROR] = '\0';
+		calc_err_msg[MAXERROR] = '\0';	/* paranoia */
 		if (calc_print_scanerr_msg != 0) {
 			fprintf(stderr, "%s\n\n", calc_err_msg);
 		}
@@ -823,7 +826,7 @@ warning(char *fmt, ...)
 	if (name) {
 		snprintf(calc_warn_msg, MAXERROR, "\"%s\", line %ld: ",
 			 name, linenumber());
-		calc_warn_msg[MAXERROR] = '\0';	/* firewall */
+		calc_warn_msg[MAXERROR] = '\0';	/* paranoia */
 		len = strlen(calc_warn_msg);
 		if (len < MAXERROR) {
 			vsnprintf(calc_warn_msg+len, MAXERROR-len, fmt, ap);
@@ -832,7 +835,7 @@ warning(char *fmt, ...)
 		vsnprintf(calc_warn_msg, MAXERROR, fmt, ap);
 	}
 	va_end(ap);
-	calc_warn_msg[MAXERROR] = '\0';
+	calc_warn_msg[MAXERROR] = '\0';	/* paranoia */

 	/* print the warning if allowed */
 	if (calc_print_scanwarn_msg != 0) {
--- a/value.c
+++ b/value.c
@@ -1879,9 +1879,9 @@ powvalue(VALUE *v1, VALUE *v2, VALUE *vres)
 					*vres = error_value(E_1OVER0);
 					break;
 				}
-				/* 0 ^ non-neg is zero, including 0^0 */
+				/* 0 ^ non-neg is 1, including 0^0 */
 				vres->v_type = V_NUM;
-				vres->v_num = qlink(&_qzero_);
+				vres->v_num = qlink(&_qone_);
 			} else if (qisint(real_v2)) {
 				vres->v_num = qpowi(v1->v_num, real_v2);
 			} else {
@@ -2774,7 +2774,7 @@ printvalue(VALUE *vp, int flags)
 	}
 	switch (type) {
 	case V_NUM:
-		qprintnum(vp->v_num, MODE_DEFAULT);
+		qprintnum(vp->v_num, MODE_DEFAULT, conf->outdigits);
 		if (conf->traceflags & TRACE_LINKS)
 			math_fmt("#%ld", vp->v_num->links);
 		break;
@@ -2835,7 +2835,7 @@ printvalue(VALUE *vp, int flags)
 		if (userfunc("octet_print", vp))
 			break;
 		qtemp = itoq((long) *vp->v_octet);
-		qprintnum(qtemp, MODE_DEFAULT);
+		qprintnum(qtemp, MODE_DEFAULT, conf->outdigits);
 		qfree(qtemp);
 		break;
 	case V_OPTR:
@@ -2888,7 +2888,7 @@ printestr(VALUE *vp)
 			math_chr('"');
 			return;
 		case V_NUM:
-			qprintnum(vp->v_num, MODE_FRAC);
+			qprintnum(vp->v_num, MODE_FRAC, conf->outdigits);
 			return;
 		case V_COM:
 			mode = math_setmode(MODE_FRAC);
@@ -2944,7 +2944,7 @@ printestr(VALUE *vp)
 				bp = vp->v_nblock->blk;
 			}
 			i = bp->datalen;
-			math_fmt("%ld,%d)", i, bp->blkchunk);
+			math_fmt("%ld,%d)", i, (int) bp->blkchunk);
 			cp = bp->data;
 			if (i > 0) {
 				math_str("={");
--- a/version.c
+++ b/version.c
@@ -1,7 +1,7 @@
 /*
 * version - determine the version of calc
 *
- * Copyright (C) 1999-2017  David I. Bell and Landon Curt Noll
+ * Copyright (C) 1999-2021  David I. Bell and Landon Curt Noll
 *
 * Primary author:  David I. Bell
 *
@@ -44,8 +44,8 @@ static char *program;

 #define MAJOR_VER	2	/* major library version */
 #define MINOR_VER	12	/* minor library version */
-#define MAJOR_PATCH	6	/* major software level under library version */
-#define MINOR_PATCH	4	/* minor software level or 0 if not patched */
+#define MAJOR_PATCH	7	/* major software level under library version */
+#define MINOR_PATCH	5	/* minor software level or 0 if not patched */


 /*
@@ -69,7 +69,7 @@ STATIC char *stored_version = NULL;	/* version formed if != NULL */
 char *Copyright = "\n"
  "calc - arbitrary precision calculator\n"
  "\n"
-  "Copyright (C) 1999-2017  David I. Bell, Landon Curt Noll "
+  "Copyright (C) 1999-2021  David I. Bell, Landon Curt Noll "
  					   "and Ernest Bowen\n"
  "\n"
  "Initial author:  David I. Bell\n"
@@ -120,6 +120,7 @@ version(void)
 	snprintf(verbuf, BUFSIZ,
 	    "%d.%d.%d.%d", calc_major_ver, calc_minor_ver,
 	     calc_major_patch, calc_minor_patch);
+	verbuf[BUFSIZ] = '\0';	/* paranoia */

 	/*
 	 * save the versions string into a newly malloced buffer
--- a/win32.mkdef
+++ b/win32.mkdef
@@ -1,5 +1,5 @@
 TERMCONTROL=-DUSE_WIN32
-HAVE_VSPRINTF=-UDONT_HAVE_VSPRINTF
+HAVE_VSNPRINTF=-UDONT_HAVE_VSNPRINTF
 BYTE_ORDER=-DLITTLE_ENDIAN
 LONG_BITS=32
 HAVE_FPOS=-DHAVE_NO_FPOS
--- a/zio.c
+++ b/zio.c
@@ -177,7 +177,7 @@ math_fmt(char *fmt, ...)
 	va_start(ap, fmt);
 	vsnprintf(buf, BUFSIZ, fmt, ap);
 	va_end(ap);
-	buf[BUFSIZ] = '\0';
+	buf[BUFSIZ] = '\0';	/* paranoia */
 	math_str(buf);
 }

--- a/zmath.h
+++ b/zmath.h
@@ -579,10 +579,16 @@ E_FUNC void zredcpower(REDC *rp, ZVALUE z1, ZVALUE z2, ZVALUE *res);
 #define MODE_HEX	5
 #define MODE_OCTAL	6
 #define MODE_BINARY	7
-#define MODE_MAX	7
+#define MODE_REAL_AUTO	8
+#define MODE_MAX	8
 #define MODE2_OFF	(MODE_MAX+1)

+/* XXX - perhaps we need the MODE_REAL_AUTO vs MODE_REAL as a config mode? */
+#if 0 	/* XXX - can we safely set MODE_INITIAL to MODE_REAL_AUTO ?? */
+#define MODE_INITIAL	MODE_REAL_AUTO
+#else
 #define MODE_INITIAL	MODE_REAL
+#endif
 #define MODE2_INITIAL	MODE2_OFF
Author	SHA1	Message	Date
Landon Curt Noll	ae3a6129b2	Release 2.12.7.5 Final cleanup for the calc version 2.12.7.5 release.	2021-02-03 03:24:47 -08:00
Landon Curt Noll	2c72570b8d	Fixed 0^(0) and 0^(6-6) to return 1 Calc as defined 0^0 as 1. However in the past, 0 raised to an expression that evaluted to zero returned 1. The result was that 0^0 was different than 0^(6-6) or even 0^(0). Now, calc will return 1 for 0^(0) and 0^zero when zero == 0.	2021-02-03 01:44:17 -08:00
Landon Curt Noll	41803b878e	Added use of $CALCHISTFILE and start of 2.12.7.5 By default, the calc history file is located in ~/.calc_history. Now, if the environment variable $CALCHISTFILE is defined and is non-empty, then calc history file will be defined by the $CALCHISTFILE environment variable.	2021-02-03 00:51:56 -08:00
Landon Curt Noll	a8be58becb	Merge pull request #8 from jcul/master Fix compilation with GCC 7+	2021-02-02 23:45:34 -08:00
Landon Curt Noll	067afc140a	Merge pull request #7 from thegithubr/patch-1 Little fix	2021-02-02 23:42:05 -08:00
Landon Curt Noll	41128fada9	Merge pull request #12 from guilhermgonzaga/master Fix typos; Insert missing lines in README.md	2021-02-02 23:41:22 -08:00
Landon Curt Noll	f5fae012f9	Release 2.12.7.4	2021-02-02 23:03:37 -08:00
Landon Curt Noll	3d25fb30cb	Release 2.12.7.4	2021-02-02 23:03:10 -08:00
Landon Curt Noll	8374586275	Merge branch 'master' of https://github.com/lcn2/calc	2021-02-02 23:02:24 -08:00
Landon Curt Noll	68c2edf610	Release 2.12.7.4 These changes are per calc version 2.12.7.3: Requiring calc shell scripts to use -s -f at the end of the initial #! line. Fixed /tmp/mersenne example in calc(1) man page. Added make variable ${ARCH_CFLAGS}. The ${ARCH_CFLAGS} is added after ${CCMISC} and before ${EXTRA_CFLAGS} when building the ${CFLAGS} for compiling C code. are ${CC} when compiling C files. The default value is: ARCH_CFLAGS= -march=native which directs C compiler to compile for the native machine. To disable use of '-march=native', set ARCH_CFLAGS to the empty string as in: make all ARCH_CFLAGS= To make calc RPMs more portable, they are compiled with an empty ARCH_CFLAGS. These changes are per calc version 2.12.7.4: Fixed issues relating to compiling on macOS. Fixed issues where <unistd.h> is needed.	2021-02-02 23:01:11 -08:00
Landon Curt Noll	d58a55a1ed	Release 2.12.7.3 Requiring calc shell scripts to use -s -f at the end of the initial #! line. Fixed /tmp/mersenne example in calc(1) man page. Added make variable ${ARCH_CFLAGS}. The ${ARCH_CFLAGS} is added after ${CCMISC} and before ${EXTRA_CFLAGS} when building the ${CFLAGS} for compiling C code. are ${CC} when compiling C files. The default value is: ARCH_CFLAGS= -march=native which directs C compiler to compile for the native machine. To disable use of '-march=native', set ARCH_CFLAGS to the empty string as in: make all ARCH_CFLAGS= To make calc RPMs more portable, they are compiled with an empty ARCH_CFLAGS. Fixed issues relating to compiling on macOS. Fixed issues where <unistd.h> is needed.	2021-02-02 22:54:51 -08:00
Landon Curt Noll	ccfa797b68	Changes as per calc 2.12.7.3	2021-02-02 20:33:59 -08:00
Guilherme Gonzaga de Andrade	0f030f0759	Fix typos; Insert missing lines in README.md Fixed typos in help/intro and README.md; Copied missing description lines from help/intro to README.md "What is calc?" section.	2020-03-03 11:27:23 -04:00
Jack Culhane	af59b9dab2	One FALLTHRU comment was inconsistent with others	2019-05-17 17:31:02 +01:00
Jack Culhane	fa173cd9aa	Fix spaces vs tabs and use FALLTHRU as it's used elsewhere	2019-05-17 17:18:07 +01:00
Jack Culhane	1f8269c0e2	Comment fallthrough case statements so compilation succeeds with GCC 7. GCC 7 Added a warning for implicit fallthroughs in switch cases. It's enabled by -Wextra, and treated as an error due to -Werror so compilation fails on GCC 7 and higher. See -Wimplicit-fallthrough in the GCC manual.	2019-05-17 17:00:48 +01:00
thegithubr	51462b8612	Little fix A little fix	2019-02-22 13:49:25 +01:00
Landon Curt Noll	9b69648921	Fix long lines in lib_calc.c	2018-11-28 12:33:10 -08:00
Landon Curt Noll	c5e416c41f	Release calc 2.12.7.2 Fixed a segfault when getpwuid() returned NULL during initialization. Thanks goes to baratharon GitHub user for reporting this issue.	2018-11-28 12:27:04 -08:00
Landon Curt Noll	37ad43c7fd	Release calc 2.12.7.1 Corrected CHANGES notes that were mixed up for TAB, VT, CR & NL. The code in 2.12.7.0 is correct. The CHANGE notes should have read: The following is a partial list of escape sequences recognized in strings and in printf formats: \a audible bell byte 0x07 in ASCII encoding \b backspace byte 0x08 in ASCII encoding \f form feed byte 0x0c in ASCII encoding \n newline byte 0x0a in ASCII encoding \r return byte 0x0d in ASCII encoding \t tab byte 0x09 in ASCII encoding \v vertical tab byte 0x0b in ASCII encoding Sorry!	2018-11-05 08:02:09 -08:00
Landon Curt Noll	a877cb52c0	Corrected CHANGES notes Corrected CHANGES notes that were mixed up for TAB, VT, CR & NL. The core in 2.12.7.0 is correct. The CHANGE notes were mixed up. Sorry!	2018-11-05 07:33:40 -08:00
Landon Curt Noll	4bec694df3	Release calc version 2.12.7.0 The following are the changes from calc version 2.12.7.0 to date: Added a patch to replaces the manual search for include files in $(INCDIR) in the have_*.h targets with compiler invocations. Thanks goes to Helmut Grohne (helmut at subdivi dot de) who implemented the patch and posted it to the Debian bug tracker and Martin Buck (m at rtin-buck dor de) for forwarding it to us. The check_include make rule was fixed to not assume /usr/include. The qprintnum() function now takes outdigits as a 3rd argument. Most of the time, this 3rd argument is just conf->outdigits. But when it comes to the experimental '%g', this value can change. This avoids having to modify conf->outdigits. Fixed a problem where gcc complains about E_FUNC not being defined for Linux systems as reported by Martin Buck (m at rtin-buck dor de). Updated the help files help/config, help/display, help/epsilon, help/fprint, help/printf, and help/strprintf to give more examples of how display digits and epsilon precision interact with displaying values. Added more information about %g in the help file help/printf. The '\a' is now recognized in a printf format string as the single byte audible bell character (byte 0x07 in ASCII encoding). The following is a partial list of escape sequences recognized in strings and in printf formats: \a audible bell byte 0x07 in ASCII encoding \b backspace byte 0x08 in ASCII encoding \f form feed byte 0x0c in ASCII encoding \n newline byte 0x0b in ASCII encoding \r return byte 0x0a in ASCII encoding \t tab byte 0x0d in ASCII encoding \v vertical tab byte 0x09 in ASCII encoding	2018-11-04 17:11:31 -08:00
Landon Curt Noll	4870a7a164	Sync check_include rule with Makefile.ship	2018-11-04 17:10:46 -08:00
Landon Curt Noll	84ccb37bc3	Regualrize escape characters Regularized the case statements in qio.c, str.c, and token.c that relate to escape characters. The '\a' is now recognized in a printf format string as the single byte audible bell character (byte 0x07 in ASCII encoding). The following is a partial list of escape sequences recognized in strings and in printf formats: \a audible bell byte 0x07 in ASCII encoding \b backspace byte 0x08 in ASCII encoding \f form feed byte 0x0c in ASCII encoding \n newline byte 0x0b in ASCII encoding \r return byte 0x0a in ASCII encoding \t tab byte 0x0d in ASCII encoding \v vertical tab byte 0x09 in ASCII encoding	2018-11-04 17:08:11 -08:00
Landon Curt Noll	29c6e9325f	Fix issue with E_FUNC under linux Fixed a problem where gcc complains about E_FUNC not being defined for Linux systems as reported by Martin Buck (m at rtin-buck dor de).	2018-11-04 17:01:24 -08:00
Landon Curt Noll	81a4a4f828	Improve string and printing documentation Updated the help files help/config, help/display, help/epsilon, help/fprint, help/printf, and help/strprintf to give more examples of how display digits and epsilon precision interact with displaying values. Added more information about %g in the help file help/printf. The '\a' is now recognized in a printf format string as the single byte audible bell character (byte 0x07 in ASCII encoding). The following is a partial list of escape sequences recognized in strings and in printf formats: \a audible bell byte 0x07 in ASCII encoding \b backspace byte 0x08 in ASCII encoding \f form feed byte 0x0c in ASCII encoding \n newline byte 0x0b in ASCII encoding \r return byte 0x0a in ASCII encoding \t tab byte 0x0d in ASCII encoding \v vertical tab byte 0x09 in ASCII encoding	2018-11-04 17:00:15 -08:00
Landon Curt Noll	1cdb5172d8	Fix Makefile lines that picky complains about	2018-10-19 19:41:58 -07:00
Landon Curt Noll	54a7a3f7bc	Release 2.12.6.10 Added a patch to replaces the manual search for include files in $(INCDIR) in the have_*.h targets with compiler invocations. Thanks goes to Helmut Grohne <helmut at subdivi dot de> who implemented the patch and posted it to the Debian bug tracker and Martin Buck (m at rtin-buck dor de) for forwarding it to us. The check_include make rule was fixed to not assume /usr/include. The qprintnum() function now takes outdigits as a 3rd argument. Most of the time, this 3rd argument is just conf->outdigits. But when it comes to the experimental '%g', this value can change. This avoids having to modify conf->outdigits.	2018-10-19 19:33:57 -07:00
Landon Curt Noll	2ea77e6151	Release 2.12.6.9 Experimental changes for macOS builds.	2018-10-15 19:37:48 -07:00
Landon Curt Noll	5cfa6199e5	Merge branch '10110111-master'	2018-09-30 16:11:23 -07:00
Landon Curt Noll	da6ccc146f	Improvements to %g pull request This code %g is preliminary. Fixed some code style issues to match the current code style. Added regression tests and help file updates to printf and strprintf. Fixed use of magic number -4: using -P instead. Noted two problem areas with XXX comments in qio.c: 1) need a qprintfg function 2) re-write to not modify conf->outdigits	2018-09-30 16:06:28 -07:00
Landon Curt Noll	fcfe237375	Merge branch 'master' of https://github.com/10110111/calc into 10110111-master	2018-09-30 14:22:41 -07:00
Landon Curt Noll	5fb3db4558	Fixed trigonometric and hyperbolic core dumps	2018-09-30 14:08:20 -07:00
Landon Curt Noll	c8705c1198	Release calc 2.12.6.8 The following are the changes in this release: For historical purposes, in lucas.cal, gen_v1(1, n) always returns 4. Fixed some compiler warnings, thanks to a report by Mike <michael dot d dot ince at gmail dot com>. Added work around for a gcc warning bug, thanks to a report by Mike <michael dot d dot ince at gmail dot com>. Fixed errors in various help files such as: mat randbit seed srandom types Removed the MAXSTRING symbol because it was no longer used by calc. Increased HIST_SIZE (depth of the history stack) from 10k to 32k. Increased TTYSIZE (reallocation size for terminal buffers) from 100 to 8191. Increased MAXDEPTH (maximum depth of input stack) from 10 to 255. Increased interactive input buffer size from 1024 to 256k. This has the effect of increasing the maximum length of an input line from a tty. This helps with an interactive bug that was reported by Ruslan Kabatsayev (b7 dot 10110111 at gmail dot com). The calc man page indicates that -d also disables the printing of the leading tilde. Added information to "help command" about how to silence messages while reading calc resource files. Fixed an error message buffer overflow thanks to a report by Frank Peters <nlp at northernlightsphoto dot biz>. Replaced all use of the C funcion sprintf() with snprintf(). Replaced all use of the C funcion vsprintf() with vsnprintf(). Replaced all DONT_HAVE_VSPRINTF with DONT_HAVE_VSNPRINTF. Replaced all Makefile var ${HAVE_VSPRINTF} with ${HAVE_VSNPRINTF}.	2018-09-30 10:25:18 -07:00
Ruslan Kabatsayev	0558bafcb6	Use MODE_REAL_AUTO by default instead of MODE_REAL This will save the user from embarrassment due to getting ~0.00000000000000000000 as the result instead of e.g. 1.23e-53.	2018-06-30 18:44:14 +03:00
Ruslan Kabatsayev	f58277f53d	Implement %g format for printf	2018-06-30 18:35:35 +03:00
Landon Curt Noll	e555a718c0	Released calc 2.12.6.7 with help and input fixes Fixed errors in various help files such as: mat randbit seed srandom types Removed the MAXSTRING symbol because it was no longer used by calc. Increased HIST_SIZE (depth of the history stack) from 10k to 32k. Increased TTYSIZE (reallocation size for terminal buffers) from 100 to 8191. Increased MAXDEPTH (maximum depth of input stack) from 10 to 255. Increased interactive input buffer size from 1024 to 256k. This has the effect of increasing the maximum length of an input line from a tty. This helps with an interactive bug that was reported by Ruslan Kabatsayev (b7 dot 10110111 at gmail dot com). k	2018-03-04 11:09:09 -08:00
Landon Curt Noll	b29fcf2dd5	Fixed errors in various help files	2018-02-27 18:21:46 -08:00
Landon Curt Noll	4f86703843	Fix long lines	2018-02-27 16:16:06 -08:00
Landon Curt Noll	07d8bf0f3e	Version 2.12.6.6	2018-02-21 12:38:39 -08:00
Landon Curt Noll	b4cd692bae	Fixed compiler warnings Fixed some compiler warnings. Added work around for a gcc warning bug.	2018-02-21 12:37:46 -08:00
Landon Curt Noll	83c898cc2b	Improved how lucas.cal pre-verifies numbers	2018-02-21 12:36:21 -08:00
Landon Curt Noll	c585d7aa78	Release calc version 2.12.6.5	2018-01-28 18:26:08 -08:00