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/* $Id: asprintf.c,v 1.4 2008-09-26 06:45:28 nicm Exp $ */
/*
* Copyright (c) 2006 Nicholas Marriott <nicm@users.sourceforge.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdarg.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include "tmux.h"
int
asprintf(char **ret, const char *format, ...)
{
va_list ap;
int n;
va_start(ap, format);
n = vasprintf(ret, format, ap);
va_end(ap);
return (n);
}
#ifndef BROKEN_VSNPRINTF
int
vasprintf(char **ret, const char *format, va_list ap)
{
int n;
if ((n = vsnprintf(NULL, 0, format, ap)) < 0)
goto error;
*ret = xmalloc(n + 1);
if ((n = vsnprintf(*ret, n + 1, format, ap)) < 0) {
xfree(*ret);
goto error;
}
return (n);
error:
*ret = NULL;
return (-1);
}
#else
int
vasprintf(char **ret, const char *fmt, va_list ap)
{
va_list aq;
size_t len;
char *buf;
int n;
len = 64;
buf = xmalloc(len);
for (;;) {
va_copy(aq, ap);
n = vsnprintf(buf, len, fmt, aq);
va_end(aq);
if (n != -1) {
*ret = buf;
return (n);
}
if (len > SIZE_MAX / 2) {
xfree(buf);
return (-1);
}
len *= 2;
}
}
#endif
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