dockapps/wmweather+/b0rken/vsnprintf.c

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#include "config.h"
/* Copyright (C) 2002 Brad Jorsch <anomie@users.sourceforge.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef vsnprintf
# undef vsnprintf
#endif
#include <stdio.h>
#include <stdarg.h>
#if defined(HAVE_WORKING_VSNPRINTF)
/* vsnprintf works, nothing to do */
#elif !defined(VSNPRINTF_BOGUS_RETVAL)
/* vsnprintf is b0rken, but the return value is ok (thus, the only problem is
* NULL) */
int rpl_vsnprintf(char *str, size_t size, const char *format, va_list ap){
if(str==NULL || size==0){{
char foo[3];
return vsnprintf(foo, 3, format, ap);
}} else {
return vsnprintf(str, size, format, ap);
}
}
#elif !defined(VSNPRINTF_IS_VSPRINTF) && defined(HAVE_VPRINTF)
/* vsnprintf's retval is bogus, so we compensate. */
static FILE *devnull;
#ifndef va_copy
# ifdef __va_copy
# define va_copy(dest, src) __va_copy(dest, src)
# else
# include <string.h>
# define va_copy(dest, src) memcpy(&dest, &src, sizeof(va_list))
# endif
#endif
int rpl_vsnprintf(char *str, size_t size, const char *format, va_list ap){
va_list ap2;
int r;
va_copy(ap2, ap);
#ifdef VSNPRINTF_NULL_OK
vsnprintf(str, size, format, ap);
#else
if(str==NULL || size==0){{
char foo[3];
vsnprintf(foo, 3, format, ap);
}} else {
vsnprintf(str, size, format, ap);
}
#endif
if(devnull==NULL){
if((devnull=fopen("/dev/null", "w"))==NULL){
perror("Couldn't open /dev/null for writing");
exit(72);
}
}
r=vfprintf(devnull, format, ap2);
va_end(ap2);
return r;
}
#else
/* OK, we're screwed */
# error "vsnprintf is so broken we can't compensate. Sorry."
#endif