asprintf.c

/*
 * Copyright (c) 2007, The xFTPd Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *     * 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.
 *
 *     * Neither the name of the xFTPd Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 *     * Redistributions of this project or parts of this project in any form
 *       must retain the following aknowledgment:
 *       "This product includes software developed by the xFTPd Project.
 *        http://www.xftpd.com/ - http://www.xftpd.org/"
 *
 * THIS SOFTWARE IS PROVIDED BY THE xFTPd PROJECT ``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 xFTPd PROJECT 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.
 */

/* MinGW lacks asprintf */

#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>

int vasprintf(char **strp, const char *fmt, va_list ap)
{
  FILE *dev_null;
  int arg_len;
  
  dev_null = fopen("nul", "w");
  arg_len = vfprintf(dev_null, fmt, ap);
  if(arg_len != -1) {
    *strp = (char *)malloc((size_t)arg_len + 1);
    arg_len = vsprintf(*strp, fmt, ap);
  } else *strp = NULL;
  fclose(dev_null);
  return arg_len;
}

int asprintf(char **strp, const char *fmt, ...)
{
  int result;
    
  va_list args;
  va_start(args, fmt);
  result = vasprintf(strp, fmt, args);
  va_end(args);
  return result;
}