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/*
* Schism Tracker - a cross-platform Impulse Tracker clone
* copyright (c) 2003-2005 Storlek <storlek@rigelseven.com>
* copyright (c) 2005-2008 Mrs. Brisby <mrs.brisby@nimh.org>
* copyright (c) 2009 Storlek & Mrs. Brisby
* copyright (c) 2010-2012 Storlek
* URL: http://schismtracker.org/
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "headers.h"
// An implementation of the C99 vsnprintf() function that only uses
// functions required by C89. It's kind of bloat-y, but I don't see
// any other way of doing this besides using tmpfile()
int vsnprintf(char *buffer, size_t count, const char *fmt, va_list ap)
{
FILE *f;
int x;
// Add a NUL terminator to the buffer before anything else,
// as to prevent cases where this function fails and the
// surrounding code always expects the result to be a valid
// C string.
if (count > 0)
buffer[0] = '\0';
f = tmpfile();
if (!f)
return -1;
x = vfprintf(f, fmt, ap);
if (x < 0) {
// that's a wrap!
fclose(f);
return -1;
}
if (count > 0) {
count = CLAMP(x, 0, count - 1);
// Now read back the file into our buffer
if (fseek(f, 0, SEEK_SET)) {
fclose(f);
return -1;
}
if (fread(buffer, 1, count, f) != count) {
fclose(f);
buffer[count] = '\0'; // WUH?
return -1;
}
// Force NUL terminate
buffer[count] = '\0';
}
fclose(f);
return x;
}
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