/* Copyright 1998 by the Massachusetts Institute of Technology.

 *

 * Permission to use, copy, modify, and distribute this

 * software and its documentation for any purpose and without

 * fee is hereby granted, provided that the above copyright

 * notice appear in all copies and that both that copyright

 * notice and this permission notice appear in supporting

 * documentation, and that the name of M.I.T. not be used in

 * advertising or publicity pertaining to distribution of the

 * software without specific, written prior permission.

 * M.I.T. makes no representations about the suitability of

 * this software for any purpose.  It is provided "as is"

 * without express or implied warranty.

 */

#include "ares_setup.h"

#include "ares_strdup.h"

#include "ares.h"

#include "ares_private.h"

char *ares_strdup(const char *s1)

{

#ifdef HAVE_STRDUP

  if (ares_malloc == malloc)

    return strdup(s1);

  else

#endif

  {

    size_t sz;

    char * s2;

    if(s1) {

      sz = strlen(s1);

      if(sz < (size_t)-1) {

        sz++;

        if(sz < ((size_t)-1) / sizeof(char)) {

          s2 = ares_malloc(sz * sizeof(char));

          if(s2) {

            memcpy(s2, s1, sz * sizeof(char));

            return s2;

          }

        }

      }

    }

    return (char *)NULL;

  }

}