curl/src/tool_strdup.c

/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2015, 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at https://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ***************************************************************************/
#include "tool_strdup.h"

#ifndef HAVE_STRDUP
char *strdup(const char *str)
{
  size_t len;
  char *newstr;

  if(!str)
    return (char *)NULL;

  len = strlen(str);

  if(len >= ((size_t)-1) / sizeof(char))
    return (char *)NULL;

  newstr = malloc((len + 1)*sizeof(char));
  if(!newstr)
    return (char *)NULL;

  memcpy(newstr, str, (len + 1)*sizeof(char));

  return newstr;

}
#endif