text: /*	$OpenBSD: asprintf.c,v 1.18 2009/11/09 00:18:27 kurt Exp $	*/
  
  /*
   * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <errno.h>
  #include <stdarg.h>
  #include "local.h"
  
  int
  asprintf(char **str, const char *fmt, ...)
  {
  	int ret;
  	va_list ap;
  	FILE f;
  	struct __sfileext fext;
  	unsigned char *_base;
  
  	_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 */
  	va_start(ap, fmt);
  	ret = __vfprintf(&f, fmt, ap);
  	va_end(ap);
  	if (ret == -1)
  		goto err;
  	*f._p = '\0';
  	_base = realloc(f._bf._base, ret + 1);
  	if (_base == NULL)
  		goto err;
  	*str = (char *)_base;
  	return (ret);
  
  err:
  	if (f._bf._base) {
  		free(f._bf._base);
  		f._bf._base = NULL;
  	}
  	*str = NULL;
  	errno = ENOMEM;
  	return (-1);
  }
  