stdio/FreeBSD/vasprintf.c

   1 /*      $OpenBSD: vasprintf.c,v 1.4 1998/06/21 22:13:47 millert Exp $   */
   2
   3 /*
   4  * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  19  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  20  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
  21  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  24  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  25  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  27  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD: src/lib/libc/stdio/vasprintf.c,v 1.19 2008/04/17 22:17:54 jhb Exp $");
  32
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <errno.h>
  36 #include "local.h"
  37
  38 int
  39 vasprintf(str, fmt, ap)
  40         char **str;
  41         const char *fmt;
  42         __va_list ap;
  43 {
  44         int ret;
  45         FILE f;
  46
  47         f._file = -1;
  48         f._flags = __SWR | __SSTR | __SALC;
  49         f._bf._base = f._p = (unsigned char *)malloc(128);
  50         if (f._bf._base == NULL) {
  51                 *str = NULL;
  52                 errno = ENOMEM;
  53                 return (-1);
  54         }
  55         f._bf._size = f._w = 127;               /* Leave room for the NUL */
  56         f._orientation = 0;
  57         memset(&f._mbstate, 0, sizeof(mbstate_t));
  58         ret = __vfprintf(&f, fmt, ap);
  59         if (ret < 0) {
  60                 free(f._bf._base);
  61                 *str = NULL;
  62                 errno = ENOMEM;
  63                 return (-1);
  64         }
  65         *f._p = '\0';
  66         *str = (char *)f._bf._base;
  67         return (ret);
  68 }