StdLib/LibC/Stdio/vasprintf.c

   1 /*  $NetBSD: vasprintf.c,v 1.10 2005/02/09 21:35:47 kleink 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 #include  <LibConfig.h>
  30 #include <sys/EfiCdefs.h>
  31 #if defined(LIBC_SCCS) && !defined(lint)
  32 __RCSID("$NetBSD: vasprintf.c,v 1.10 2005/02/09 21:35:47 kleink Exp $");
  33 #endif /* LIBC_SCCS and not lint */
  34
  35 #include <assert.h>
  36 #include <errno.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include "reentrant.h"
  40 #include "local.h"
  41
  42 int
  43 vasprintf(str, fmt, ap)
  44   char **str;
  45   const char *fmt;
  46   _BSD_VA_LIST_ ap;
  47 {
  48   int ret;
  49   FILE f;
  50   struct __sfileext fext;
  51   unsigned char *_base;
  52
  53   _DIAGASSERT(str != NULL);
  54   _DIAGASSERT(fmt != NULL);
  55
  56   _FILEEXT_SETUP(&f, &fext);
  57   f._file = -1;
  58   f._flags = __SWR | __SSTR | __SALC;
  59   f._bf._base = f._p = (unsigned char *)malloc(128);
  60   if (f._bf._base == NULL)
  61     goto err;
  62   f._bf._size = f._w = 127;   /* Leave room for the NUL */
  63   ret = __vfprintf_unlocked(&f, fmt, ap);
  64   if (ret == -1)
  65     goto err;
  66   *f._p = '\0';
  67   _base = realloc(f._bf._base, (size_t)(ret + 1));
  68   if (_base == NULL)
  69     goto err;
  70   *str = (char *)_base;
  71   return (ret);
  72
  73 err:
  74   if (f._bf._base)
  75     free(f._bf._base);
  76   *str = NULL;
  77   errno = ENOMEM;
  78   return (-1);
  79 }