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154 lines
4.3 KiB
C
154 lines
4.3 KiB
C
/*
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* have_varvs - try <varargs.h> to see if it really works with vsnprintf()
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*
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* Copyright (C) 1999,2018,2021 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: 1995/09/09 22:41:10
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* File existed as early as: 1995
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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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/*
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* Some systems have bugs in the <varargs.h> implementation that show up in
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* vsnprintf(), so we may have to try to use snprintf() as if it were
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* vsnprintf() and hope for the best.
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*
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* This program will output #defines and exits 0 if vsnprintf() (or snprintf())
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* produces the results that we expect. This program exits 1 if vsnprintf()
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* (or snprintf()) produces unexpected results while using the <stdarg.h>
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* include file.
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*/
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#include <stdio.h>
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#include "have_unistd.h"
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#if defined(HAVE_UNISTD_H)
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#include <unistd.h>
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#endif
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#include "have_string.h"
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#undef VSNPRINTF_SIZE_T
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#if defined(FORCE_STDC) || (defined(__STDC__) && __STDC__ != 0) || \
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defined(__cplusplus)
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# define VSNPRINTF_SIZE_T size_t
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#else
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# define VSNPRINTF_SIZE_T long
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#endif
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#if !defined(STDARG) && !defined(SIMULATE_STDARG)
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#include <varargs.h>
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#endif
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#include "banned.h" /* include after system header <> includes */
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char buf[BUFSIZ+1];
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#if !defined(STDARG) && !defined(SIMULATE_STDARG)
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void
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try_nthis(char *fmt, VSNPRINTF_SIZE_T size, ...)
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{
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va_list ap;
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va_start(ap);
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#if !defined(DONT_HAVE_VSNPRINTF)
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vsnprintf(buf, size, fmt, ap);
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#else
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snprintf(buf, size, fmt, ap);
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#endif
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va_end(ap);
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}
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#else
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void
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try_nthis(char *a, VSNPRINTF_SIZE_T size, int b, char *c, int d)
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{
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return;
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}
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#endif
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int
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main(void)
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{
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/*
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* setup
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*/
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buf[0] = '\0';
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/*
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* test variable args and vsnprintf/snprintf
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*/
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try_nthis("@%d:%s:%d@", sizeof(buf)-1, 1, "hello", 5);
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if (strcmp(buf, "@1:hello:5@") != 0) {
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#if !defined(DONT_HAVE_VSNPRINTF)
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/* <varargs.h> with vsnprintf() didn't work */
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#else
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/* <varargs.h> with snprintf() simulating vsnprintf() didn't work */
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#endif
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exit(1);
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}
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try_nthis("%s %d%s%d%d %s", sizeof(buf)-1,
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"Landon Noll 1st proved that", 2, "^", 23209, -1, "was prime");
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if (strcmp(buf,
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"Landon Noll 1st proved that 2^23209-1 was prime") != 0) {
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#if !defined(DONT_HAVE_VSNPRINTF)
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/* <varargs.h> with vsnprintf() didn't work */
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#else
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/* <varargs.h> with snprintf() simulating vsnprintf() didn't work */
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#endif
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exit(1);
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}
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/*
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* report the result
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*/
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puts("/* what type of variable args do we have? */");
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puts("#define VARARGS /* use <varargs.h> */");
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puts("#include <varargs.h>");
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puts("\n/* should we use vsnprintf() and vsnprintf()? */");
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#if !defined(DONT_HAVE_VSNPRINTF)
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puts("#define HAVE_VSNPRINTF /* yes */");
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#else
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puts("/*");
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puts(" * Hack aleart!!!");
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puts(" *");
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puts(" * Systems that do not have vsnprintf() need something. In some");
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puts(" * cases the snprintf() function will deal correctly with the");
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puts(" * va_alist 4th arg. Same goes for a lack of an vsnprintf()");
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puts(" * function. In either case we use the #defines below and");
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puts(" * hope for the best!");
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puts(" */");
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puts("#define vsnprintf snprintf");
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puts("#undef HAVE_VSNPRINTF");
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#endif
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/* exit(0); */
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return 0;
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}
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