StdLib/LibC/Stdio/vasprintf.c

/*  $NetBSD: vasprintf.c,v 1.10 2005/02/09 21:35:47 kleink Exp $  */

/*
 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``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
 * THE AUTHOR 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  <LibConfig.h>
#include <sys/EfiCdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: vasprintf.c,v 1.10 2005/02/09 21:35:47 kleink Exp $");
#endif /* LIBC_SCCS and not lint */

#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "reentrant.h"
#include "local.h"

int
vasprintf(str, fmt, ap)
  char **str;
  const char *fmt;
  _BSD_VA_LIST_ ap;
{
  int ret;
  FILE f;
  struct __sfileext fext;
  unsigned char *_base;

  _DIAGASSERT(str != NULL);
  _DIAGASSERT(fmt != NULL);

  _FILEEXT_SETUP(&f, &fext);
  f._file = -1;
  f._flags = __SWR | __SSTR | __SALC;
  f._bf._base = f._p = (unsigned char *)malloc(128);
  if (f._bf._base == NULL)
    goto err;
  f._bf._size = f._w = 127;   /* Leave room for the NUL */
  ret = __vfprintf_unlocked(&f, fmt, ap);
  if (ret == -1)
    goto err;
  *f._p = '\0';
  _base = realloc(f._bf._base, (size_t)(ret + 1));
  if (_base == NULL)
    goto err;
  *str = (char *)_base;
  return (ret);

err:
  if (f._bf._base)
    free(f._bf._base);
  *str = NULL;
  errno = ENOMEM;
  return (-1);
}