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/* sprintf_alloc.c -- like sprintf with memory allocation
Copyright (C) 2010 Ubiq Technologies <graham.gower@gmail.com>
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, 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.
*/
#include <stdarg.h>
#include "sprintf_alloc.h"
#include "libbb/libbb.h"
void
sprintf_alloc(char **str, const char *fmt, ...)
{
va_list ap;
int n;
unsigned int size = 0;
*str = NULL;
for (;;) {
va_start(ap, fmt);
n = vsnprintf (*str, size, fmt, ap);
va_end(ap);
if (n < 0) {
fprintf(stderr, "%s: encountered an output or encoding"
" error during vsnprintf.\n",
__FUNCTION__);
exit(EXIT_FAILURE);
}
if (n < size)
break;
/* Truncated, try again with more space. */
size = n+1;
*str = xrealloc(*str, size);
}
}
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