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/*
* have_varvs - try <varargs.h> to see if it really works with vsprintf()
*
* Copyright (C) 1999 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
* as published by the Free Software Foundation.
*
* Calc is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
* Public License for more details.
*
* A copy of version 2.1 of the GNU Lesser General Public License is
* distributed with calc under the filename COPYING-LGPL. You should have
* received a copy with calc; if not, write to Free Software Foundation, Inc.
* 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
* @(#) $Revision: 29.2 $
* @(#) $Id: have_varvs.c,v 29.2 2000/06/07 14:02:13 chongo Exp $
* @(#) $Source: /usr/local/src/cmd/calc/RCS/have_varvs.c,v $
*
* Under source code control: 1995/09/09 22:41:10
* File existed as early as: 1995
*
* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
*/
/*
* 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.
*
* 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>
* include file.
*/
#include <stdio.h>
#include "have_unistd.h"
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#include "have_string.h"
#ifdef HAVE_STRING_H
# include <string.h>
#endif
char buf[BUFSIZ];
#if !defined(STDARG) && !defined(SIMULATE_STDARG)
#include <varargs.h>
void
try_this(char *fmt, ...)
{
va_list ap;
va_start(ap);
#if !defined(DONT_HAVE_VSPRINTF)
vsprintf(buf, fmt, ap);
#else
sprintf(buf, fmt, ap);
#endif
va_end(ap);
}
#else
void
try_this(char *a, int b, char *c, int d)
{
return;
}
#endif
int
main(void)
{
/*
* setup
*/
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)
/* <stdarg.h> with vsprintf() didn't work */
#else
/* <stdarg.h> with sprintf() simulating vsprintf() didn't work */
#endif
exit(1);
}
/*
* report the result
*/
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()? */");
#if !defined(DONT_HAVE_VSPRINTF)
puts("#define HAVE_VS /* 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. Hope for the best!");
puts(" */");
puts("#define vsprintf sprintf");
puts("#undef HAVE_VS");
#endif
/* exit(0); */
return 0;
}
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