stdio/FreeBSD/asprintf.c

   1 /*      $OpenBSD: asprintf.c,v 1.8 2002/02/19 19:39:36 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/asprintf.c,v 1.13 2002/09/26 13:09:48 tjr Exp $");
  32
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <errno.h>
  36 #include <stdarg.h>
  37
  38 #include "local.h"
  39
  40 int
  41 asprintf(char **str, char const *fmt, ...)
  42 {
  43         int ret;
  44         va_list ap;
  45         FILE f;
  46         struct __sFILEX ext;
  47
  48         f._file = -1;
  49         f._flags = __SWR | __SSTR | __SALC;
  50         f._bf._base = f._p = (unsigned char *)malloc(128);
  51         if (f._bf._base == NULL) {
  52                 *str = NULL;
  53                 errno = ENOMEM;
  54                 return (-1);
  55         }
  56         f._bf._size = f._w = 127;               /* Leave room for the NUL */
  57         f._extra = &ext;
  58         INITEXTRA(&f);
  59         va_start(ap, fmt);
  60         ret = __vfprintf(&f, fmt, ap);          /* Use unlocked __vfprintf */
  61         va_end(ap);
  62         if (ret < 0) {
  63                 free(f._bf._base);
  64                 *str = NULL;
  65                 errno = ENOMEM;
  66                 return (-1);
  67         }
  68         *f._p = '\0';
  69         *str = (char *)f._bf._base;
  70         return (ret);
  71 }