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/*
* "$Id: vsnprintf.c,v 1.1 1998/11/05 16:07:45 mike Exp $"
*
* vsnprintf() function for the Fast Light Tool Kit (FLTK).
*
* Emulates this call on systems that lack it (pretty much everything
* except glibc systems).
*
* KNOWN BUGS:
*
* Field width & Precision is ignored for %%, %c, and %s.
*
* A malicious user who manages to create a %-fmt string that prints
* more than 99 characters can still overflow the temporary buffer.
* For instance %110f will overflow.
*
* Only handles formats that are both documented in the glibc man page
* for printf and also handled by your system's sprintf().
*
* Copyright 1998 by Bill Spitzak and others.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA.
*
* Please report all bugs and problems to "fltk-bugs@easysw.com".
*/
#include <stdio.h>
#include <stdarg.h>
#include <config.h>
#if !HAVE_VSNPRINTF
int vsnprintf(char* str, size_t size, const char* fmt, va_list ap) {
const char* e = str+size-1;
char* p = str;
char copy[20];
char* copy_p;
char sprintf_out[100];
while (*fmt && p < e) {
if (*fmt != '%') {
*p++ = *fmt++;
} else {
fmt++;
copy[0] = '%';
for (copy_p = copy+1; copy_p < copy+19;) {
switch ((*copy_p++ = *fmt++)) {
case 0:
fmt--; goto CONTINUE;
case '%':
*p++ = '%'; goto CONTINUE;
case 'c':
*p++ = va_arg(ap, int);
goto CONTINUE;
case 'd':
case 'i':
case 'o':
case 'u':
case 'x':
case 'X':
*copy_p = 0;
sprintf(sprintf_out, copy, va_arg(ap, int));
copy_p = sprintf_out;
goto DUP;
case 'e':
case 'E':
case 'f':
case 'g':
*copy_p = 0;
sprintf(sprintf_out, copy, va_arg(ap, double));
copy_p = sprintf_out;
goto DUP;
case 'p':
*copy_p = 0;
sprintf(sprintf_out, copy, va_arg(ap, void*));
copy_p = sprintf_out;
goto DUP;
case 'n':
*(va_arg(ap, int*)) = p-str;
goto CONTINUE;
case 's':
copy_p = va_arg(ap, char*);
if (!copy_p) copy_p = "NULL";
DUP:
while (*copy_p && p < e) *p++ = *copy_p++;
goto CONTINUE;
}
}
}
CONTINUE:;
}
*p = 0;
if (*fmt) return -1;
return p-str;
}
#endif
#if !HAVE_SNPRINTF
int snprintf(char* str, size_t size, const char* fmt, ...) {
int ret;
va_list ap;
va_start(ap, fmt);
ret = vsnprintf(str, size, fmt, ap);
va_end(ap);
return ret;
}
#endif
/*
* End of "$Id: vsnprintf.c,v 1.1 1998/11/05 16:07:45 mike Exp $".
*/
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