mirror of
https://github.com/lcn2/calc.git
synced 2025-08-16 01:03:29 +03:00
ac0d84eef8
Added notes to help/unexpected about:
display() will limit the number of digits printed after decimal point
%d will format after the decimal point for non-integer numeric values
%x will format as fractions for non-integer numeric values
fprintf(fd, "%d\n", huge_value) may need fflush(fd) to finish
Fixed Makefile dependencies for the args.h rule.
Fixed Makefile cases where echo with -n is used. On some systems,
/bin/sh does not use -n, so we must call /bin/echo -n instead
via the ${ECHON} Makefile variable.
Add missing standard tools to sub-Makefiles to make them
easier to invoke directly.
Sort lists of standard tool Makefile variables and remove duplicates.
Declare the SHELL at the top of Makefiles.
Fixed the depend rule in the custom Makefile.
Improved the messages produced by the depend in the Makefiles.
Changed the UNUSED define in have_unused.h to be a macro with
a parameter. Changed all use of UNUSED in *.c to be UNUSED(x).
Removed need for HAVE_UNUSED in building the have_unused.h file.
CCBAN is given to ${CC} in order to control if banned.h is in effect.
The banned.h attempts to ban the use of certain dangerous functions
that, if improperly used, could compromise the computational integrity
if calculations.
In the case of calc, we are motivated in part by the desire for calc
to correctly calculate: even during extremely long calculations.
If UNBAN is NOT defined, then calling certain functions
will result in a call to a non-existent function (link error).
While we do NOT encourage defining UNBAN, there may be
a system / compiler environment where re-defining a
function may lead to a fatal compiler complication.
If that happens, consider compiling as:
make clobber all chk CCBAN=-DUNBAN
as see if this is a work-a-round.
If YOU discover a need for the -DUNBAN work-a-round, PLEASE tell us!
Please send us a bug report. See the file:
BUGS
or the URL:
http://www.isthe.com/chongo/tech/comp/calc/calc-bugrept.html
for how to send us such a bug report.
Added the building of have_ban_pragma.h, which will determine
if "#pragma GCC poison func_name" is supported. If it is not,
or of HAVE_PRAGMA_GCC_POSION=-DHAVE_NO_PRAGMA_GCC_POSION, then
banned.h will have no effect.
Fixed building of the have_getpgid.h file.
Fixed building of the have_getprid.h file.
Fixed building of the have_getsid.h file.
Fixed building of the have_gettime.h file.
Fixed building of the have_strdup.h file.
Fixed building of the have_ustat.h file.
Fixed building of the have_rusage.h file.
Added HAVE_NO_STRLCPY to control if we want to test if
the system has a strlcpy() function. This in turn produces
the have_strlcpy.h file wherein the symbol HAVE_STRLCPY will
be defined, or not depending if the system comes with a
strlcpy() function.
If the system does not have a strlcpy() function, we
compile our own strlcpy() function. See strl.c for details.
Added HAVE_NO_STRLCAT to control if we want to test if
the system has a strlcat() function. This in turn produces
the have_strlcat.h file wherein the symbol HAVE_STRLCAT will
be defined, or not depending if the system comes with a
strlcat() function.
If the system does not have a strlcat() function, we
compile our own strlcat() function. See strl.c for details.
Fixed places were <string.h>, using #ifdef HAVE_STRING_H
for legacy systems that do not have that include file.
Added ${H} Makefile symbol to control the announcement
of forming and having formed hsrc related files. By default
H=@ (announce hsrc file formation) vs. H=@: to silence hsrc
related file formation.
Explicitly turn off quiet mode (set Makefile variable ${Q} to
be empty) when building rpms.
Improved and fixed the hsrc build process.
Forming rpms is performed in verbose mode to assist debugging
to the rpm build process.
Compile custom code, if needed, after main code is compiled.
181 lines
5.0 KiB
C
181 lines
5.0 KiB
C
/*
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* banned - optionally ban dqngerious functions
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*
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* Unless UNBAN is defined, this file will turn the use
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* of certain dangerous functions into syntax errors.
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*
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* In the case of calc, we are motivated in part by the desire for
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* calc to correctly calculate: even durings extremely long calculations.
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*
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* If UNBAN is NOT defined, then calling certain functions
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* will result in a syntaxc error.
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*
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* If we define UNBAN, then the effect of this file is disabled.
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*
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* The banned.h attempts to ban the use of certain dangerous functions
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* that, if improperly used, could compromise the computational integrity
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* if calculations.
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*
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* In the case of calc, we are motivated in part by the desire for calc
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* to correctly calculate: even durings extremely long calculations.
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*
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* If UNBAN is NOT defined, then calling certain functions
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* will result in a call to a non-existent function (link error).
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*
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* While we do NOT encourage defining UNBAN, there may be
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* a system / compiler environment where re-defining a
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* function may lead to a fatal compiler complication.
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* If that happens, consider compiling as:
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*
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* make clobber all chk CCBAN=-DUNBAN
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*
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* as see if this is a work-a-round.
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*
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* If YOU discover a need for the -DUNBAN work-a-round, PLEASE tell us!
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* Please send us a bug report. See the file:
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*
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* BUGS
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*
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* or the URL:
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*
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* http://www.isthe.com/chongo/tech/comp/calc/calc-bugrept.html
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*
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* for how to send us such a bug report.
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*
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* Copyright (C) 2021 Landon Curt Noll
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*
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* Calc is open software; you can redistribute it and/or modify it under
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* the terms of the version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* Calc is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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* Public License for more details.
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*
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* A copy of version 2.1 of the GNU Lesser General Public License is
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* distributed with calc under the filename COPYING-LGPL. You should have
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* received a copy with calc; if not, write to Free Software Foundation, Inc.
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Under source code control: 2021/03/06 21:07:31
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* File existed as early as: 2021
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*
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* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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*/
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#if !defined(PRE_HAVE_BAN_PRAGMA_H)
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#include "have_ban_pragma.h"
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#endif /* ! PRE_HAVE_BAN_PRAGMA_H */
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#if !defined(INCLUDE_BANNED_H)
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#define INCLUDE_BANNED_H
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/*
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* If we define UNBAN, then the effect of this file is disabled.
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*/
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#if !defined(UNBAN)
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/*
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* In the spirit of:
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*
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* https://github.com/git/git/blob/master/banned.h
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*
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* we will ban the use of certain unsafe functions by turning
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* then into function calls that do not exist.
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*
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* In the case of calc, we are motivated in part by the desire
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* for calc to correctly calculate: even durings extremely long
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* calculations.
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*
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* If UNBAN is NOT defined, then calling certain functions
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* will result in a syntaxc error.
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*
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* Unlike the above URL, we suggest an alternative function.
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* In many cases, additional logic is required to use the
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* alternative function, we cannot simply replace one function
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* with another.
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*/
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/*
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* If one is not careful, strcpy() can lead to buffer overflows.
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* Use strlcpy() instead.
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*/
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#if defined(HAVE_PRAGMA_GCC_POSION)
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#undef strcpy
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#pragma GCC poison strcpy
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#endif /* HAVE_PRAGMA_GCC_POSION */
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/*
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* If one is not careful, strcat() can lead to buffer overflows.
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* Use strlcat() instead.
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*/
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#if defined(HAVE_PRAGMA_GCC_POSION)
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#undef strcat
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#pragma GCC poison strcat
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#endif /* HAVE_PRAGMA_GCC_POSION */
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/*
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* If one is not careful, strncpy() can lead to buffer overflows.
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* Use memccpy() instead.
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*/
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#if defined(HAVE_PRAGMA_GCC_POSION)
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#undef strncpy
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#pragma GCC poison strncpy
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#endif /* HAVE_PRAGMA_GCC_POSION */
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/*
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* If one is not careful, strncat() can lead to buffer overflows.
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* Use memccpy() instead.
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*/
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#if defined(HAVE_PRAGMA_GCC_POSION)
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#undef strncat
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#pragma GCC poison strncat
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#endif /* HAVE_PRAGMA_GCC_POSION */
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/*
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* If one is not careful, sprintf() can lead to buffer overflows.
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* Use snprintf() instead.
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*/
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#if defined(HAVE_PRAGMA_GCC_POSION)
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#undef sprintf
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#pragma GCC poison sprintf
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#endif /* HAVE_PRAGMA_GCC_POSION */
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/*
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* If one is not careful, vsprintf() can lead to buffer overflows.
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* Use vsnprintf() instead.
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*/
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#if defined(HAVE_PRAGMA_GCC_POSION)
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#undef vsprintf
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#pragma GCC poison vsprintf
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#endif /* HAVE_PRAGMA_GCC_POSION */
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/*
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* XXX - As of 2021, functions such as:
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*
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* gmtime_s
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* localtime_s
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* ctime_s
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* asctime_s
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*
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* are not universal. We cannot yet ban the following
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* functions because we do not have a portable AND
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* widely available alternative. Therefore we just
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* have to be extra careful when using:
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*
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* gmtime
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* localtime
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* ctime
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* ctime_r
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* asctime
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* asctime_r
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*/
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#endif /* !UNBAN */
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#endif /* !INCLUDE_BANNED_H */
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