compat/strndup.c

   1 /*      $OpenBSD: strndup.c,v 1.2 2015/08/31 02:53:57 guenther Exp $    */
   2
   3 /*
   4  * Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include <sys/types.h>
  20
  21 #include <stddef.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 char *
  26 strndup(const char *str, size_t maxlen)
  27 {
  28         char *copy;
  29         size_t len;
  30
  31         len = strnlen(str, maxlen);
  32         copy = malloc(len + 1);
  33         if (copy != NULL) {
  34                 (void)memcpy(copy, str, len);
  35                 copy[len] = '\0';
  36         }
  37
  38         return copy;
  39 }