diff --git a/CHANGES b/CHANGES
index 1ed789d..9ae2457 100644
--- a/CHANGES
+++ b/CHANGES
@@ -839,7 +839,7 @@ The following are the changes from calc version 2.12.5.4 to 2.12.5.6:
     Rewrote gen_v1() in the lucas.cal resource file using the method
     based on a paper:
 
- 	"A note on primality tests for N = h*2^n-1", by Oystein J. Rodseth,
+	"A note on primality tests for N = h*2^n-1", by Oystein J. Rodseth,
 	Department of Mathematics, University of Bergen, BIT Numerical
 	Mathematics. 34 (3): pp 451-454.
 
@@ -898,13 +898,13 @@ The following are the changes from calc version 2.12.5.3 to 2.12.5.3:
     macOS (Darwin) users who installed calc version 2.12.5.2
     should, after installing version 2.12.5.3:
 
-    	rm -rf /opt/calc
+	rm -rf /opt/calc
 
 
 The following are the changes from calc version 2.12.5.1 to 2.12.5.2:
 
     NOTE: calc version 2.12.5.2, for macOS (Darwin) users,
-    	  installed under /opt/calc.  We neglected to mention this
+	  installed under /opt/calc.  We neglected to mention this
 	  AND /usr/local would have been a better choice.  Sorry!
 	  Fixed in calc version 2.12.5.3.
 
@@ -977,7 +977,7 @@ The following are the changes from calc version 2.12.4.14 to 2.12.5.0:
 
     For Apple OS X / Darwin target:
 
-    	MACOSX_DEPLOYMENT_TARGET is no longer defined
+	MACOSX_DEPLOYMENT_TARGET is no longer defined
 	using clang compiler
 
 	By default, -install-name is used when forming shared libs.
@@ -1021,9 +1021,9 @@ The following are the changes from calc version 2.12.4.14 to 2.12.5.0:
     for mul2, sq2, and pow2.  However, it has been shown that this
     code is not correct.  Suggestions for a replacement are welcome!
 
-   	calc -u 'read alg_config; config("user_debug", 2),; best_mul2();'
-   	calc -u 'read alg_config; config("user_debug", 2),; best_sq2();'
-   	calc -u 'read alg_config; config("user_debug", 2),; best_pow2();'
+	calc -u 'read alg_config; config("user_debug", 2),; best_mul2();'
+	calc -u 'read alg_config; config("user_debug", 2),; best_sq2();'
+	calc -u 'read alg_config; config("user_debug", 2),; best_pow2();'
 
     Fixed a number of pedantic compiler warnings.
 
@@ -1190,7 +1190,7 @@ The following are the changes from calc version 2.12.4.6 to version 2.12.4.10:
     With the exception of 3 source files, we became "picky" about
     line lengths and other issues reported by the picky tool:
 
-    	cal/test8900.cal
+	cal/test8900.cal
 	cal/set8700.line
 	help/errorcodes.sed
 
@@ -1246,7 +1246,7 @@ The following are the changes from calc version 2.12.4.0 to 2.12.4.2:
     Added prep makefile rule to make is easier to compile calc without
     an optimizer.  By doing:
 
-    	make clobber prep
+	make clobber prep
 
     one may build a calc binary that is easier to debug.
 
@@ -1403,7 +1403,7 @@ The following are the changes from calc version 2.12.1.1 to 2.12.2.2:
     what was calc-something.tar.gz is now calc-something.tar.bz2.
     To "uncompress" use:
 
-    	bunzip2 calc-something.tar.bz2
+	bunzip2 calc-something.tar.bz2
 
     On some systems, one may untar directly by:
 
@@ -1468,7 +1468,7 @@ The following are the changes from calc version 2.12.1.10 to 2.12.2:
     Renamed the following variables related to calc error processing:
 
 	int calc_jmp		==>    int calc_use_matherr_jmpbuf
-    	jmp_buf calc_jmp_buf	==>    jmp_buf calc_matherr_jmpbuf
+	jmp_buf calc_jmp_buf	==>    jmp_buf calc_matherr_jmpbuf
 
 	int post_init		==>    int calc_use_scanerr_jmpbuf
 	jmp_buf jmpbuf		==>    jmpbuf calc_scanerr_jmpbuf
@@ -1483,7 +1483,7 @@ The following are the changes from calc version 2.12.1.10 to 2.12.2:
     Parse/scan errors will not be printed if calc_print_scanerr_msg
     is zero.  By default:
 
-    	int calc_print_scanerr_msg = 1;
+	int calc_print_scanerr_msg = 1;
 
     This variable is declared in the lib_calc.h include file.  Storage
     comes from libcalc.
@@ -1491,7 +1491,7 @@ The following are the changes from calc version 2.12.1.10 to 2.12.2:
     Parse/scan warnings will not be printed if calc_print_scanwarn_msg
     is zero.  By default:
 
-    	int calc_print_scanwarn_msg = 1;
+	int calc_print_scanwarn_msg = 1;
 
     This variable is declared in the lib_calc.h include file.  Storage
     comes from libcalc.
@@ -1527,13 +1527,13 @@ The following are the changes from calc version 2.12.1.10 to 2.12.2:
     Replaced the concept of compiler sets in the Makefile with
     host target section in the Makefile.  Initial host targets are:
 
-    	Linux
+	Linux
 	Darwin
 	FreeBSD
 	(default)	<<== Target does not match any previous target name
 	Simple
 
-    	NOTE: If your target is not supported below and the default target
+	NOTE: If your target is not supported below and the default target
 	      is not suitable for your needs, please send to the:
 
 	      	calc-contrib at asthe dot com
@@ -1681,7 +1681,7 @@ The following are the changes from calc version 2.12.1.8 to 2.12.1.9:
     comments.  Improved calc comment documentation in "help unexpected"
     to help other avoid similar mistakes.  Calc comments are of the form:
 
-    	/* c style comments */
+	/* c style comments */
 	/*
 	 * multi-line
 	 * comments
@@ -1695,7 +1695,7 @@ The following are the changes from calc version 2.12.1.8 to 2.12.1.9:
 
     Documented these help commands in "help help":
 
-    	help ->
+	help ->
 	help *
 	help .
 	help %
@@ -1876,7 +1876,7 @@ The following are the changes from calc version 2.12.0 to 2.12.0.8:
     Added the builtin function fpathopen() to open a file while
     searching along a path:
 
-    	; fd2 = fpathopen("tmp/date", "r", ".:~:~sc:/tmp:/var/tmp:/var")
+	; fd2 = fpathopen("tmp/date", "r", ".:~:~sc:/tmp:/var/tmp:/var")
 	; print fd2
 	"/var/tmp/date"
 
@@ -1926,12 +1926,12 @@ The following are the changes from calc version 2.12.0 to 2.12.0.8:
     level.  When comparing with older source, one may use the -b argument
     of the diff command to ignore changes in amount of white space:
 
-    	diff -b -r -u calc-2.11.11 calc-2.12.0
+	diff -b -r -u calc-2.11.11 calc-2.12.0
 
     The read, write, and help commands use the value of global string
     variable if the symbol name starts with a $.  For example:
 
-    	global x = "lucas.cal";
+	global x = "lucas.cal";
 	read $x;	/* same as read lucas.cal or read "lucas.cal" */
 
     Added dotest.cal resource.  Based on a design by Ernest Bowen
@@ -2041,7 +2041,7 @@ The following are the changes from calc version 2.12.0 to 2.12.0.8:
 
     Changed the default values for the following config() parameters:
 
-    	config("mul2") == 1780
+	config("mul2") == 1780
 	config("sq2") == 3388
 	config("pow2") == 176
 
@@ -2136,10 +2136,10 @@ The following are the changes from calc version 2.12.0 to 2.12.0.8:
     value is TRUE by default.  Examples of variable name collisions
     include when:
 
-    	* both local and static variables have the same name
-    	* both local and global variables have the same name
-    	* both function parameter and local variables have the same name
-    	* both function parameter and global variables have the same name
+	* both local and static variables have the same name
+	* both local and global variables have the same name
+	* both function parameter and local variables have the same name
+	* both function parameter and global variables have the same name
 
     Fix of a bug which causes some static variables not to be correctly
     unscoped when their identifiers are used in a global declaration.
@@ -2159,7 +2159,7 @@ The following are the changes from calc version 2.12.0 to 2.12.0.8:
     Changed the definition of the function ssq() to enable list arguments
     to be processed in the same way as in sum().  For example:
 
-    	ssq(1,2, list(3,4,list(5,6)), list(), 7, 8)
+	ssq(1,2, list(3,4,list(5,6)), list(), 7, 8)
 
     returns the value of 1^2 + 2^2 + ... + 8^2 == 204.
 
@@ -2167,7 +2167,7 @@ The following are the changes from calc version 2.12.0 to 2.12.0.8:
     various ways of evaluating sums, sums of squares, etc, for large
     lists and matrices.  For example:
 
-    	read sumtimes
+	read sumtimes
 	doalltimes(1e6)
 
     Calc now ignores carriage returns (\r), vertical tabs (\v), and
@@ -2206,7 +2206,7 @@ The following are the changes from calc version 2.11.10.1 to 2.11.11:
 
     Fixed a bug reported by the sourceforge user: cedars where:
 
-    	ln(exp(6)) == 3		/* WRONG!!! */
+	ln(exp(6)) == 3		/* WRONG!!! */
 
     incorrectly returned 1.  This bug was fixed by Ernest Bowen
     <ebowen at une dot edu dot au>.  The regression test
@@ -2311,7 +2311,7 @@ The following are the changes from calc version 2.11.10 to 2.11.10:
 
     Fixed -d so that:
 
-    	calc -d 2/3
+	calc -d 2/3
 
     will print 0.66666666666666666667 without the leading tilde as
     advertised in the man page.
@@ -2331,7 +2331,7 @@ The following are the changes from calc version 2.11.10 to 2.11.10:
 
     Added custom function:
 
-    	custom("pmodm127", q)
+	custom("pmodm127", q)
 
     to compute 2^(2^127-1) mod q.  While currently slower than just
     doing pmod(2,2^127-1,q), it is added to give an example of a
@@ -2422,7 +2422,7 @@ The following are the changes from calc version 2.11.8.0 to 2.11.8.1:
     configuration (calc -n or config("all", "newstd")) is now the default
     calc configuration.  The flag:
 
-    	calc -O
+	calc -O
 
     was added to get the old classic calc configuration.  The flag command
     line flag, -n, now does nothing.  Use of -n is deprecated and may go
@@ -2599,16 +2599,16 @@ The following are the changes from calc version 2.11.5.5 to 2.11.5.9:
 
     Now using version numbers of one of these forms:
 
-    	x.y.z.w
-    	x.y.z
-    	x.y
+	x.y.z.w
+	x.y.z
+	x.y
 
     Changed the READLINE_LIB Makefile variable to not link with -lreadline
     by default.  If you do have readline, we recommend that you use it.
     If you can install the GNU readline:
 
 	http://freshmeat.net/projects/gnureadline/
-    	http://cnswww.cns.cwru.edu/php/chet/readline/rltop.html
+	http://cnswww.cns.cwru.edu/php/chet/readline/rltop.html
 
     we recommend it.  But if not, you should set the USE_READLINE,
     READLINE_LIB, and READLINE_INCLUDE Makefile variables to empty.
@@ -2680,7 +2680,7 @@ The following are the changes from calc version 2.11.5t4.1 to 2.11.5t4.4:
     Added subject requirements for the calc-tester-request and
     calc-bugs-mail Email aliases.  See:
 
-    	http://www.isthe.com/chongo/tech/comp/calc/email.html
+	http://www.isthe.com/chongo/tech/comp/calc/email.html
 
     for details.
 
@@ -2847,7 +2847,7 @@ The following are the changes from calc version 2.11.5t2 to 2.11.5t2.1:
     Applied a bug fix from Ernest Bowen <ernie at turing dot une dot
     edu dot au> dealing with one-line "static" declaration like:
 
-    	static a = 1, b;
+	static a = 1, b;
 
     Added regression test 8310 to test for the static bug fix.
 
@@ -2960,7 +2960,7 @@ The following are the changes from calc version 2.11.5t0 to 2.11.5t1.1:
     Configuration values that used to return "true" or "false" now return
     1 (a true value) or 0 (a false value).  Thus one can do:
 
-    	if (config("tab")) { ... } else { ... }
+	if (config("tab")) { ... } else { ... }
 
     The configuration values that now return 1 or 0 are:
 
diff --git a/cal/README b/cal/README
index a86e7dd..0968f35 100644
--- a/cal/README
+++ b/cal/README
@@ -186,7 +186,7 @@ bernoulli.cal
     Calculate the nth Bernoulli number.
 
     NOTE: There is now a bernoulli() builtin function.  This file is
-    	  left here for backward compatibility and now simply returns
+	  left here for backward compatibility and now simply returns
 	  the builtin function.
 
 
@@ -767,7 +767,7 @@ lucas.cal
     prove that h*2^n-1 is prime or not prime.
 
     NOTE: Some call this term u(0).  The function gen_u0(h, n, v1)
-    	  simply calls gen_u2(h, n, v1) for such people.  :-)
+	  simply calls gen_u2(h, n, v1) for such people.  :-)
 
     gen_v1(h, v)
 
@@ -1467,7 +1467,7 @@ sumtimes.cal
     the list or matrix to use.  The doalltimes() function will run
     all of the sumtimes tests.  For example:
 
-    	doalltimes(1e6);
+	doalltimes(1e6);
 
 
 surd.cal
diff --git a/cal/alg_config.cal b/cal/alg_config.cal
index 2801755..e17a326 100644
--- a/cal/alg_config.cal
+++ b/cal/alg_config.cal
@@ -474,7 +474,7 @@ define best_mul2()
      */
     while (low+1 < high) {
 
-    	/* try the mid-point */
+	/* try the mid-point */
 	mid = int((low+high)/2);
 	if (config("user_debug") > 0) {
 	    printf("testing multiply alg1/alg2 ratio for len = %d\n", mid);
@@ -956,7 +956,7 @@ define best_sq2()
      */
     while (low+1 < high) {
 
-    	/* try the mid-point */
+	/* try the mid-point */
 	mid = int((low+high)/2);
 	if (config("user_debug") > 0) {
 	    printf("testing square alg1/alg2 ratio for len = %d\n", mid);
@@ -1455,7 +1455,7 @@ define best_pow2()
      */
     while (low+1 < high) {
 
-    	/* try the mid-point */
+	/* try the mid-point */
 	mid = int((low+high)/2);
 	if (config("user_debug") > 0) {
 	    printf("testing pow2 alg1/alg2 ratio for len = %d\n", mid);
diff --git a/cal/chi.cal b/cal/chi.cal
index 72a80b3..b854d25 100644
--- a/cal/chi.cal
+++ b/cal/chi.cal
@@ -40,7 +40,7 @@ define Z(x, eps_term)
 
     /* obtain the error term */
     if (isnull(eps_term)) {
-    	eps = epsilon();
+	eps = epsilon();
     } else {
 	eps = eps_term;
     }
@@ -81,7 +81,7 @@ define P(x, eps_term)
 
     /* obtain the error term */
     if (isnull(eps_term)) {
-    	eps = epsilon();
+	eps = epsilon();
     } else {
 	eps = eps_term;
     }
diff --git a/cal/dms.cal b/cal/dms.cal
index c6984eb..696087a 100644
--- a/cal/dms.cal
+++ b/cal/dms.cal
@@ -188,7 +188,7 @@ define dms_abs(a)
 
     /* firewall - just absolute value non dms objects */
     if (! istype(a, ans)) {
-    	return abs(a);
+	return abs(a);
     }
 
     /* compute degrees */
diff --git a/cal/dotest.cal b/cal/dotest.cal
index 04f9e93..523ef98 100644
--- a/cal/dotest.cal
+++ b/cal/dotest.cal
@@ -157,7 +157,7 @@ define dotest(dotest_file, dotest_code = 0, dotest_maxcond = -1)
      * test the close of the line file
      */
     printf("%d-: detected %d error condition(s), many of which may be OK\n",
-    	   dotest_code, dotest_old_errcount-dotest_errcnt);
+	   dotest_code, dotest_old_errcount-dotest_errcnt);
     printf("%d-: closing line file: %d\n", dotest_code, dotest_file);
     fclose(dotest_f_file);
 
diff --git a/cal/factorial2.cal b/cal/factorial2.cal
index bac739e..94f60da 100644
--- a/cal/factorial2.cal
+++ b/cal/factorial2.cal
@@ -56,7 +56,7 @@ define __CZ__factor_factorial(n,start){
   if(start){
     if(!isint(start) && start < 0 && start > n)
       return newerror("__CZ__factor_factorial(n,start): value of "
-      		      "parameter 'start' out of range");
+		      "parameter 'start' out of range");
     if(start == n && isprime(n)){
       prime_list = mat[1 , 2];
       prime_list[0,0] = n;
@@ -64,7 +64,7 @@ define __CZ__factor_factorial(n,start){
     }
     else if(!isprime(start) && nextprime(start) >n)
       return newerror("__CZ__factor_factorial(n,start): value of parameter "
-      		      "'start' out of range");
+		      "'start' out of range");
     else{
       if(!isprime(start))  prime = nextprime(start);
       else prime = start;
@@ -225,11 +225,11 @@ define __CZ__multiply_factored_factorial(matrix,stop){
 
   if(!ismat(matrix))
    return newerror("__CZ__multiply_factored_factorial(matrix): "
-   		   "argument matrix not a matrix ");
+		   "argument matrix not a matrix ");
   if(!matrix[0,0])
     return
       newerror("__CZ__multiply_factored_factorial(matrix): "
-      	       "matrix[0,0] is null/0");
+	       "matrix[0,0] is null/0");
 
   if(!isnull(stop))
     pix = stop;
@@ -376,7 +376,7 @@ define bigcatalan(n){
 
 /*
   df(-111) = -1/3472059605858239446587523014902616804783337112829102414124928
-  		7753332469144201839599609375
+		7753332469144201839599609375
 
  df(-3+1i) = 0.12532538977287649201-0.0502372106177184607i
  df(2n + 1) = (2*n)!/(n!*2^n)
@@ -427,7 +427,7 @@ define doublefactorial(n){
         */
        eps=epsilon(epsilon()*1e-2);
        ret =  2^(n/2-1/4 * cos(pi()* n)+1/4) * pi()^(1/4 *
-       	      cos(pi()* n)-1/4)* gamma(n/2+1);
+	      cos(pi()* n)-1/4)* gamma(n/2+1);
        epsilon(eps);
        return ret;
     }
diff --git a/cal/hms.cal b/cal/hms.cal
index 0da195e..2596f93 100644
--- a/cal/hms.cal
+++ b/cal/hms.cal
@@ -188,7 +188,7 @@ define hms_abs(a)
 
     /* firewall - just absolute value non hms objects */
     if (! istype(a, ans)) {
-    	return abs(a);
+	return abs(a);
     }
 
     /* compute hours */
diff --git a/cal/intfile.cal b/cal/intfile.cal
index 14da608..93772af 100644
--- a/cal/intfile.cal
+++ b/cal/intfile.cal
@@ -156,7 +156,7 @@ define be2file(v, filename)
      */
     octlen = int((highbit(v)+8) / 8);
     for (i=octlen-1; i >= 0; --i) {
-    	fputc(fd, char(v >> (i*8)));
+	fputc(fd, char(v >> (i*8)));
     }
 
     /*
diff --git a/cal/lucas.cal b/cal/lucas.cal
index d9ade2f..5868411 100644
--- a/cal/lucas.cal
+++ b/cal/lucas.cal
@@ -731,7 +731,7 @@ rodseth_xhn(x, h, n)
 		return 0;
 	}
 
- 	/*
+	/*
 	 * Check for jacobi(x-2, h*2^n-1) == 1	(Ref4, condition 1) part 1
 	 */
 	testval = h*2^n-1;
@@ -739,7 +739,7 @@ rodseth_xhn(x, h, n)
 		return 0;
 	}
 
- 	/*
+	/*
 	 * Check for jacobi(x+2, h*2^n-1) == -1	(Ref4, condition 1) part 2
 	 */
 	if (jacobi(x+2, testval) != -1) {
diff --git a/cal/toomcook.cal b/cal/toomcook.cal
index 97867bb..06530c5 100644
--- a/cal/toomcook.cal
+++ b/cal/toomcook.cal
@@ -336,7 +336,7 @@ define __CZ__produce_long_random_number(n)
   ret = 1;
   if(!isint(n) || n<1)
     return newerror("__CZ__produce_long_random_number(n): "
-    		    "n is not an integer >=1");
+		    "n is not an integer >=1");
   for(k=0;k<n;k++){
     ret += random();
     ret  = toomcook4square(ret);
diff --git a/cal/zeta2.cal b/cal/zeta2.cal
index 47547d3..171f6ad 100644
--- a/cal/zeta2.cal
+++ b/cal/zeta2.cal
@@ -72,7 +72,7 @@ define hurwitzzeta(s,a){
   limit=(precision*ln(10)-re((s-.5)*result)+(1.*realpart_a)*ln(2.*pi()))/2;
   limit=max(2,ceil(max(limit,abs(s*1.)/2)));
   limit_function=ceil(sqrt((limit+realpart_a/2-.25)^2+(imagpart_s*1.)^2/4)/
-  		      pi());
+		      pi());
   if (config("user_debug") > 0) {
      print "limit_function = " limit_function;
      print "limit = " limit;
diff --git a/custom/HOW_TO_ADD b/custom/HOW_TO_ADD
index 988c1c7..d1f885b 100644
--- a/custom/HOW_TO_ADD
+++ b/custom/HOW_TO_ADD
@@ -374,12 +374,12 @@ Step 5: Write your custom function
 
     One is able to set bit 8 by way of the calc command line:
 
-    	calc -D 128
+	calc -D 128
 
     See the calc man page for details.  One may also set that bit
     while running calc by way of the config() builtin function:
 
-    	config("calc_debug", 128);
+	config("calc_debug", 128);
 
     See the help/config file for details on calc_debug.
 
diff --git a/custom/pmodm127 b/custom/pmodm127
index 35fb68a..0017118 100644
--- a/custom/pmodm127
+++ b/custom/pmodm127
@@ -13,7 +13,7 @@ DESCRIPTION
 
     This custom function will return the value:
 
-    	q mod 2^(2^127-1)
+	q mod 2^(2^127-1)
 
     This custom function serves as a demonstration of how to write
     a custom function.  It performs the equivalent of:
diff --git a/help/base2 b/help/base2
index e64aa53..96987d7 100644
--- a/help/base2
+++ b/help/base2
@@ -79,7 +79,7 @@ EXAMPLE
     10 /* 012 */
     ; base2(16),
     ; 131072
-    	131072 /* 0x20000 */
+	131072 /* 0x20000 */
     ; 2345
 	2345 /* 0x929 */
 
@@ -96,7 +96,7 @@ LINK LIBRARY
 SEE ALSO
     base, config, str
 
-## Copyright (C) 2002  Landon Curt Noll
+## Copyright (C) 2002,2021  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
diff --git a/help/config b/help/config
index 4f10398..ea959d8 100644
--- a/help/config
+++ b/help/config
@@ -866,10 +866,10 @@ DESCRIPTION
     when a variable name collides with an exist name of a higher scope.
     Examples of collisions are when:
 
-    	* both local and static variables have the same name
-    	* both local and global variables have the same name
-    	* both function parameter and local variables have the same name
-    	* both function parameter and global variables have the same name
+	* both local and static variables have the same name
+	* both local and global variables have the same name
+	* both function parameter and local variables have the same name
+	* both function parameter and global variables have the same name
 
     The initial "redecl_warn" value is 1.
 
@@ -895,7 +895,7 @@ EXAMPLE
 	1
 
     ; config("version")
-    		"2.12.0"
+		"2.12.0"
 
     ; config("all")
 	mode            "real"
diff --git a/help/d2dm b/help/d2dm
index 7cf48c8..3829d6e 100644
--- a/help/d2dm
+++ b/help/d2dm
@@ -31,7 +31,7 @@ DESCRIPTION
 
     The value d will be set as if the following were used:
 
-    	d = int(return_value);
+	d = int(return_value);
 
     For some rounding modes, d will be an integer in the interval [0, 360).
     For other rounding modes, d will be an integer in the interval (-360, 0].
@@ -52,7 +52,7 @@ DESCRIPTION
     The following shows relationship between the return value and the resulting
     d, and m values:
 
-    	return_value == d + m/60;
+	return_value == d + m/60;
 
 
 EXAMPLE
diff --git a/help/d2dms b/help/d2dms
index d48a403..20566b7 100644
--- a/help/d2dms
+++ b/help/d2dms
@@ -32,7 +32,7 @@ DESCRIPTION
 
     The value d will be set as if the following were used:
 
-    	d = int(return_value);
+	d = int(return_value);
 
     For some rounding modes, d will be an integer in the interval [0, 360).
     For other rounding modes, d will be an integer in the interval (-360, 0].
@@ -67,7 +67,7 @@ DESCRIPTION
     The following shows relationship between the return value and the resulting
     d, m, and s values:
 
-    	return_value == d + m/60 + s/3600;
+	return_value == d + m/60 + s/3600;
 
 
 EXAMPLE
diff --git a/help/digit b/help/digit
index 465b584..6c93b16 100644
--- a/help/digit
+++ b/help/digit
@@ -73,8 +73,8 @@ EXAMPLE
 	; for (n = 6; n >= -6; n--) print digit(a, n, 256),; print
 	0 0 0 0 1 226 64 201 251 231 108 139 67
 
-  	; for (n = 1; n >= -12; n++) print digit(10/7, n),; print
-    	; 0 1 4 2 8 5 7 1 4 2 8 5 7 1
+	; for (n = 1; n >= -12; n++) print digit(10/7, n),; print
+	; 0 1 4 2 8 5 7 1 4 2 8 5 7 1
 
 	; print digit(10/7, -7e1000, 1e6)
 	428571
@@ -92,7 +92,7 @@ LINK LIBRARY
 SEE ALSO
     bit
 
-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2021  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
diff --git a/help/display b/help/display
index f8ef8a3..7aea68d 100644
--- a/help/display
+++ b/help/display
@@ -21,7 +21,7 @@ DESCRIPTION
 
     The builtin function:
 
-    	display(d)
+	display(d)
 	display()
 
     is an alias for:
@@ -96,7 +96,7 @@ LINK LIBRARY
 SEE ALSO
     config, epsilon, fprintf, printf, strprintf
 
-## Copyright (C) 2004,2018  Landon Curt Noll
+## Copyright (C) 2004,2018,2021  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
diff --git a/help/fopen b/help/fopen
index 5d75036..7d0daab 100644
--- a/help/fopen
+++ b/help/fopen
@@ -38,7 +38,7 @@ DESCRIPTION
 
     (*) NOTE on 'b' / binary/text mode:
 
-    	The 'b' or fopen binary mode has no effect on POSIX / Linux
+	The 'b' or fopen binary mode has no effect on POSIX / Linux
 	/ Un*x-like systems.  On those systems a text file is the
 	same as a binary file (as it should be for any modern-day
 	operating system).  Adding 'b' to an fopen has no effect
@@ -107,7 +107,7 @@ SEE ALSO
     fprintf, fputc, fputs, fseek, fsize, ftell, isfile, printf, prompt,
     fpathopen, strerror
 
-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2021  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
diff --git a/help/fpathopen b/help/fpathopen
index c28f8f4..91ec1d3 100644
--- a/help/fpathopen
+++ b/help/fpathopen
@@ -21,7 +21,7 @@ DESCRIPTION
     Absolute filenames, and filenames with an implied path are files
     that begin with:
 
-    	/	# absolute path
+	/	# absolute path
 	./	# implied path through the current working directory
 	../	# implied path through the current working directory parent
 	~	# absolute path going through a home directory
@@ -29,12 +29,12 @@ DESCRIPTION
     A search path is a :-separated list of directories used to search for
     a filename.  For example:
 
-    	fpathopen("whey", "r", ".:/tmp:/var/tmp:~chongo/pub:~/tmp");
+	fpathopen("whey", "r", ".:/tmp:/var/tmp:~chongo/pub:~/tmp");
 
     will cause this function to open the first readable file it
     files while searching through these paths in order:
 
-    	./whey
+	./whey
 	/tmp/whey
 	/var/tmp/whey
 	~chongo/pub/whey
@@ -55,7 +55,7 @@ DESCRIPTION
     the file "/tmp/log" assuming that the user is not allowed to
     create files in the previous system directories:
 
-    	fpathopen("log", "a", "/:/etc:/bin:/usr/bin:/tmp");
+	fpathopen("log", "a", "/:/etc:/bin:/usr/bin:/tmp");
 
     The CALCPATH search path is taken from the $CALCPATH environment
     variable or if no such variable exists, a compiled in default search
@@ -92,7 +92,7 @@ DESCRIPTION
 
     (*) NOTE on 'b' / binary/text mode:
 
-    	The 'b' or fopen binary mode has no effect on POSIX / Linux
+	The 'b' or fopen binary mode has no effect on POSIX / Linux
 	/ Un*x-like systems.  On those systems a text file is the
 	same as a binary file (as it should be for any modern-day
 	operating system).  Adding 'b' to an fopen has no effect
@@ -180,7 +180,7 @@ SEE ALSO
     fprintf, fputc, fputs, fseek, fsize, ftell, isfile, printf, prompt,
     environment, calcpath
 
-## Copyright (C) 2006  Landon Curt Noll
+## Copyright (C) 2006,2021  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
diff --git a/help/g2gm b/help/g2gm
index b2a4d24..66020ab 100644
--- a/help/g2gm
+++ b/help/g2gm
@@ -31,7 +31,7 @@ DESCRIPTION
 
     The value g will be set as if the following were used:
 
-    	g = int(return_value);
+	g = int(return_value);
 
     For some rounding modes, g will be an integer in the interval [0, 400).
     For other rounding modes, g will be an integer in the interval (-400, 0].
@@ -52,7 +52,7 @@ DESCRIPTION
     The following shows relationship between the return value and the resulting
     g, and m values:
 
-    	return_value == g + m/60;
+	return_value == g + m/60;
 
 
 EXAMPLE
diff --git a/help/g2gms b/help/g2gms
index 8409e42..563f5af 100644
--- a/help/g2gms
+++ b/help/g2gms
@@ -32,7 +32,7 @@ DESCRIPTION
 
     The value g will be set as if the following were used:
 
-    	g = int(return_value);
+	g = int(return_value);
 
     For some rounding modes, g will be an integer in the interval [0, 400).
     For other rounding modes, g will be an integer in the interval (-400, 0].
@@ -67,7 +67,7 @@ DESCRIPTION
     The following shows relationship between the return value and the resulting
     g, m, and s values:
 
-    	return_value == g + m/60 + s/3600;
+	return_value == g + m/60 + s/3600;
 
 
 EXAMPLE
diff --git a/help/h2hm b/help/h2hm
index bcfe54a..f77d0ac 100644
--- a/help/h2hm
+++ b/help/h2hm
@@ -31,7 +31,7 @@ DESCRIPTION
 
     The value h will be set as if the following were used:
 
-    	h = int(return_value);
+	h = int(return_value);
 
     For some rounding modes, h will be an integer in the interval [0, 24).
     For other rounding modes, h will be an integer in the interval (-24, 0].
@@ -52,7 +52,7 @@ DESCRIPTION
     The following shows relationship between the return value and the resulting
     h, and m values:
 
-    	return_value == h + m/60;
+	return_value == h + m/60;
 
 
 EXAMPLE
diff --git a/help/h2hms b/help/h2hms
index 8173d10..1323b93 100644
--- a/help/h2hms
+++ b/help/h2hms
@@ -32,7 +32,7 @@ DESCRIPTION
 
     The value h will be set as if the following were used:
 
-    	h = int(return_value);
+	h = int(return_value);
 
     For some rounding modes, h will be an integer in the interval [0, 24).
     For other rounding modes, h will be an integer in the interval (-24, 0].
@@ -67,7 +67,7 @@ DESCRIPTION
     The following shows relationship between the return value and the resulting
     h, m, and s values:
 
-    	return_value == h + m/60 + s/3600;
+	return_value == h + m/60 + s/3600;
 
 
 EXAMPLE
diff --git a/help/hash b/help/hash
index ccefbab..2c7311d 100644
--- a/help/hash
+++ b/help/hash
@@ -18,7 +18,7 @@ DESCRIPTION
     takes into account more abstract concepts such as data types.
 
     WARNING: Use of FNV-0 is NOT recommended for general purposes.
-    	     Calc uses FNV-0 for internal objects such as associative
+	     Calc uses FNV-0 for internal objects such as associative
 	     arrays as well as other internal processes.  Calc
 	     maintains the use of FNV-0 for backwards compatibility.
 
@@ -47,7 +47,7 @@ LINK LIBRARY
 SEE ALSO
     ishash, fnv, sha1
 
-## Copyright (C) 1999-2007,2014  Landon Curt Noll
+## Copyright (C) 1999-2007,2014,2021  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
diff --git a/help/intro b/help/intro
index 7a6410f..effb24c 100644
--- a/help/intro
+++ b/help/intro
@@ -13,7 +13,7 @@ What is calc?
 
     and the calculator will print:
 
-    	    15
+	    15
 
     Calc has the usual collection of arithmetic operators +, -, /, *
     as well as ^ (exponentiation), % (modulus) and // (integer divide).
@@ -27,7 +27,7 @@ What is calc?
 
     Notice that calc values can be very large.  For example:
 
-    	    2^23209-1
+	    2^23209-1
 
     will print:
 
@@ -60,7 +60,7 @@ What is calc?
 
     and the calculator prints:
 
-    	    13763753091226345046315979581580902400000000
+	    13763753091226345046315979581580902400000000
 
     The calculator also knows about complex numbers, so that typing:
 
@@ -69,7 +69,7 @@ What is calc?
 
     will print:
 
-    	    17+6i
+	    17+6i
 	    -55.50474777265624667147+193.9265235748927986537i
 
     The calculator can calculate transcendental functions, and accept and
@@ -81,19 +81,19 @@ What is calc?
 
     prints:
 
-    	0.8414709848078965066525023216302989996225630607983710656727517099919104
+	0.8414709848078965066525023216302989996225630607983710656727517099919104
 
     Calc can output values in terms of fractions, octal or hexadecimal.
     For example:
 
-    	    config("mode", "fraction"),
+	    config("mode", "fraction"),
 	    (17/19)^23
 	    base(16),
 	    (19/17)^29
 
      will print:
 
-     	    19967568900859523802559065713/257829627945307727248226067259
+	    19967568900859523802559065713/257829627945307727248226067259
 	    0x9201e65bdbb801eaf403f657efcf863/0x5cd2e2a01291ffd73bee6aa7dcf7d1
 
     All numbers are represented as fractions with arbitrarily large
diff --git a/help/issq b/help/issq
index 4874ffa..aee795d 100644
--- a/help/issq
+++ b/help/issq
@@ -18,12 +18,12 @@ DESCRIPTION
 
     Note that issq() works on rational values, so:
 
-    	issq(25/16) == 1
+	issq(25/16) == 1
 
     If you want to test for prefect square integers, you need to exclude
     non-integer values before you test:
 
-    	isint(curds) && issq(curds)
+	isint(curds) && issq(curds)
 
 EXAMPLE
     ; print issq(25), issq(3), issq(0)
@@ -45,7 +45,7 @@ SEE ALSO
     isobjtype, isodd, isprime, isrand, israndom, isreal, isrel,
     issimple, isstr, istype
 
-## 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
diff --git a/help/jacobi b/help/jacobi
index 44dc846..9261bf5 100644
--- a/help/jacobi
+++ b/help/jacobi
@@ -17,8 +17,8 @@ DESCRIPTION
     If y is an odd prime, then the Legendre symbol (x/y) returns:
 
 	(x/y) == 0	x is divisible by y (0 == x % y)
-    	(x/y) == 1	if x is a quadratic residue modulo y
-    	(x/y) == -1	if x is not a quadratic residue modulo y
+	(x/y) == 1	if x is a quadratic residue modulo y
+	(x/y) == -1	if x is not a quadratic residue modulo y
 
     Legendre symbol often denoted as (x/y) as if x/y were a fraction.
 
diff --git a/help/mod b/help/mod
index 7c3adbd..33ae81c 100644
--- a/help/mod
+++ b/help/mod
@@ -25,11 +25,11 @@ TYPES
 DESCRIPTION
     The expression:
 
-    	x % y
+	x % y
 
     is equivalent to call:
 
-    	mod(x, y)
+	mod(x, y)
 
     The function:
 
@@ -37,7 +37,7 @@ DESCRIPTION
 
     is equivalent to:
 
-    	config("mod", rnd), x % y
+	config("mod", rnd), x % y
 
     except that the global config("mod") value does not change.
 
@@ -137,7 +137,7 @@ LINK LIBRARY
 SEE ALSO
     quo, quomod, //, %
 
-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2021  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
diff --git a/help/overview b/help/overview
index a89b353..5fc064b 100644
--- a/help/overview
+++ b/help/overview
@@ -85,7 +85,7 @@
 
     The man command is an alias for the help command.  Try:
 
-    	    man jacobi
+	    man jacobi
 
     Only calc help files may be displayed by the help and man commands.
 
diff --git a/help/pound b/help/pound
index b9ae52d..afa9255 100644
--- a/help/pound
+++ b/help/pound
@@ -18,7 +18,7 @@ DESCRIPTION
 
     As a unary operator:
 
-    	# value
+	# value
 
     returns the number of 1 bits, or pop-count of the absolute value of
     the numerator (abs(num(value))).  Therefore when x is a non-negative
@@ -52,7 +52,7 @@ DESCRIPTION
 
     For example, of an executable file contains:
 
-    	#!/usr/local/src/bin/calc/calc -q -f
+	#!/usr/local/src/bin/calc/calc -q -f
 	/* NOTE: The #! above must start in column 1 of the 1st line */
 	/* 	 The 1st line must end with -f */
 	## Single # shell comments don't work, use two or more
diff --git a/help/rand b/help/rand
index ccf884f..699fb41 100644
--- a/help/rand
+++ b/help/rand
@@ -14,7 +14,7 @@ DESCRIPTION
     Generate a pseudo-random number using an subtractive 100 shuffle generator.
     We return a pseudo-random number over the half closed interval:
 
-    	[min,beyond)	((min <= return < beyond))
+	[min,beyond)	((min <= return < beyond))
 
     By default, min is 0 and beyond is 2^64.
 
diff --git a/help/random b/help/random
index 1f667c1..9960881 100644
--- a/help/random
+++ b/help/random
@@ -14,7 +14,7 @@ DESCRIPTION
     Generate a pseudo-random number using a Blum-Blum-Shub generator.
     We return a pseudo-random number over the half closed interval:
 
-    	[min,beyond)	((min <= return < beyond))
+	[min,beyond)	((min <= return < beyond))
 
     By default, min is 0 and beyond is 2^64.
 
@@ -159,7 +159,7 @@ LINK LIBRARY
 SEE ALSO
     seed, srand, randbit, isrand, rand, srandom, israndom
 
-## Copyright (C) 1999-2007  Landon Curt Noll
+## Copyright (C) 1999-2007,2021  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
diff --git a/help/statement b/help/statement
index 76b0157..4a98ad6 100644
--- a/help/statement
+++ b/help/statement
@@ -302,7 +302,7 @@ Statements
 	    help round
 
     See:
-    	    help builtin
+	    help builtin
 
     for a list of builtin functions.
 
@@ -321,11 +321,11 @@ Statements
 
     The man command is an alias for the help command.  For example:
 
-    	    man jacobi
+	    man jacobi
 
     Only calc help files may be displayed by the help and man commands.
 
-## Copyright (C) 1999-2007,2017  Landon Curt Noll
+## Copyright (C) 1999-2007,2017,2021  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
diff --git a/help/stoponerror b/help/stoponerror
index 0c3b5ae..a3dc3c4 100644
--- a/help/stoponerror
+++ b/help/stoponerror
@@ -14,7 +14,7 @@ DESCRIPTION
     The stoponerror controls when or if calc stops based on the
     number of errors:
 
-    	n == -1		do not stop
+	n == -1		do not stop
 	n == 0		stop on error unless calc was invoked with -c
 	n > 0		stop when n errors are encountered
 
@@ -35,7 +35,7 @@ LINK LIBRARY
 SEE ALSO
     errcount, errmax, errorcodes, iserror, errno, strerror, newerror
 
-## Copyright (C) 2006  Landon Curt Noll
+## Copyright (C) 2006,2021  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
diff --git a/help/strtolower b/help/strtolower
index 61698ff..caed821 100644
--- a/help/strtolower
+++ b/help/strtolower
@@ -18,7 +18,7 @@ DESCRIPTION
 
 EXAMPLE
     ; strtolower(" GNU Lesser General Public License");
-    	" gnu lesser general public license"
+	" gnu lesser general public license"
 
 LIMITS
     none.
diff --git a/help/strtoupper b/help/strtoupper
index 8ae5646..852bede 100644
--- a/help/strtoupper
+++ b/help/strtoupper
@@ -18,7 +18,7 @@ DESCRIPTION
 
 EXAMPLE
     ; strtoupper(" GNU Lesser General Public License");
-    	" GNU LESSER GENERAL PUBLIC LICENSE"
+	" GNU LESSER GENERAL PUBLIC LICENSE"
 
 LIMITS
     none.
diff --git a/help/unexpected b/help/unexpected
index 6a1b547..244649f 100644
--- a/help/unexpected
+++ b/help/unexpected
@@ -73,11 +73,11 @@ Unexpected
 
     Be careful about the precedence of operators.  Note that:
 
-    	-1 ^ 0.5 == -1
+	-1 ^ 0.5 == -1
 
     whereas:
 
-    	(-1) ^ 0.5 == 1i
+	(-1) ^ 0.5 == 1i
 
     because the above expression in parsed as:
 
@@ -85,7 +85,7 @@ Unexpected
 
     whereas:
 
-    	(-1) ^ 0.5 == 1i
+	(-1) ^ 0.5 == 1i
 
 
     op= operators associate left to right
@@ -277,7 +277,7 @@ Unexpected
     A single # is an calc operator, not a comment.  However two or more
     ##'s in a row is a comment.  See "help pound" for more information.
 
-    	#!/usr/local/src/bin/calc/calc -q -f
+	#!/usr/local/src/bin/calc/calc -q -f
 
 	/* a correct comment */
 	## another correct comment
@@ -289,7 +289,7 @@ Unexpected
 
     This next example is WRONG:
 
-    	#!/usr/local/src/bin/calc/calc -q -f
+	#!/usr/local/src/bin/calc/calc -q -f
 
 	# This is not a calc calc comment because it has only a single #
 	# You must to start comments with ## or /*
@@ -350,7 +350,7 @@ Unexpected
 
     In most interactive shells:
 
-    	calc 2 * 3
+	calc 2 * 3
 
     will frequently produce a "Missing operator" error because the '*' is
     evaluated as a "shell glob".  To avoid this you must quote or escape
@@ -358,11 +358,11 @@ Unexpected
 
     For example, bash / ksh / sh shell users should use:
 
-    	calc '2 * 3'
+	calc '2 * 3'
 
     or:
 
-    	calc 2 \* 3
+	calc 2 \* 3
 
     or some other form of shell meta-character escaping.
 
@@ -393,7 +393,7 @@ Unexpected
 
     To avoid this problem, use:
 
-    	seq 5 | while read i; do calc "($i+3)^2" </dev/null; done
+	seq 5 | while read i; do calc "($i+3)^2" </dev/null; done
 
     which produces the expected results:
 
diff --git a/help/version b/help/version
index bcb5948..55bc533 100644
--- a/help/version
+++ b/help/version
@@ -12,16 +12,16 @@ DESCRIPTION
 
     Calc version strings can be of the form:
 
-    	x.y.z.w
-    	x.y.z
-    	x.y
+	x.y.z.w
+	x.y.z
+	x.y
 
     where x, y, z, w, v are integers (without leading 0's) and,
     t is the literal character 't'.
 
 EXAMPLE
     ; version()
-    	    "2.11.5.4"
+	    "2.11.5.4"
 
 LIMITS
     none
diff --git a/input.c b/input.c
index 61d9c67..a6a1a47 100644
--- a/input.c
+++ b/input.c
@@ -1127,7 +1127,7 @@ addreadset(char *name, char *path, struct stat *sbuf)
 	 * like UNIX inodes. _fullpath also allocated the memory for
 	 * this new longer path name.
 	 */
- 	 {
+	 {
 		readset[ret].path = _fullpath(NULL, path, MSDOS_MAX_PATH);
 		if (readset[ret].path == NULL) {
 			return -1;
diff --git a/qfunc.c b/qfunc.c
index 46ef72c..bd03ba4 100644
--- a/qfunc.c
+++ b/qfunc.c
@@ -673,7 +673,7 @@ qdigit(NUMBER *q, ZVALUE dpos, ZVALUE base)
 	/*
 	 * In the first stage, q is expressed as base^k * N/D where
 	 *	gcd(D, base) = 1
-  	 * K is k as a ZVALUE
+	 * K is k as a ZVALUE
 	 */
 	base.sign = 0;
 	if (ziszero(base) || zisunit(base))
diff --git a/str.c b/str.c
index ad351b9..3470e35 100644
--- a/str.c
+++ b/str.c
@@ -939,9 +939,9 @@ stringcaserel(STRING *s1, STRING *s2)
 		c2++;
 	}
 	if ( (tolower(*c1)) > (tolower(*c2)))
-        	return 1;
+		return 1;
 	if ( (tolower(*c1)) <  (tolower(*c2)))
-        	return -1;
+		return -1;
 	if (i1 < i2) return -1;
 	return (i1 > i2);
 }
diff --git a/version.c b/version.c
index e21fa7d..e5e416b 100644
--- a/version.c
+++ b/version.c
@@ -79,7 +79,7 @@ char *Copyright = "\n"
   "calc - arbitrary precision calculator\n"
   "\n"
   "Copyright (C) 1999-2021  David I. Bell, Landon Curt Noll "
-  					   "and Ernest Bowen\n"
+					   "and Ernest Bowen\n"
   "\n"
   "Initial author:  David I. Bell\n"
   "\n"