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/* nbdkit
* Copyright Red Hat
*
* This is based on code from util-linux/lib/blkdev.c which is
* distributed under a compatible license.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Red Hat nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include "nbdkit-string.h"
ssize_t
string_append_format (string *s, const char *fs, ...)
{
char *s2;
va_list ap;
size_t len;
ssize_t need;
int r;
va_start (ap, fs);
r = vasprintf (&s2, fs, ap);
va_end (ap);
if (r == -1) return -1;
/* Make sure the string is always \0-terminated by ensuring the
* reservation is 1 byte longer than we need.
*/
len = strlen (s2);
need = s->len + len + 1 - s->cap;
if (need > 0 && string_reserve (s, need) == -1) {
free (s2);
return -1;
}
string_append_array (s, s2, len);
free (s2);
/* Make sure the string is \0-terminated in the byte of space
* reserved after the string.
*/
s->ptr[s->len] = '\0';
return s->len;
}
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