compat_strndup.c

   1 /*      $Id: compat_strndup.c,v 1.3 2020/06/15 20:19:39 schwarze Exp $  */
   2 /*      $OpenBSD: strndup.c,v 1.3 2019/01/25 00:19:25 millert Exp $     */
   3
   4 /*
   5  * Copyright (c) 2010 Todd C. Miller <millert@openbsd.org>
   6  *
   7  * Permission to use, copy, modify, and distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19 #include "config.h"
  20
  21 #include <sys/types.h>
  22
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 char *
  27 strndup(const char *str, size_t maxlen)
  28 {
  29         char *copy;
  30         size_t len;
  31
  32         for (len = 0; len < maxlen && str[len] != '\0'; len++)
  33                 continue;
  34
  35         copy = malloc(len + 1);
  36         if (copy != NULL) {
  37                 (void)memcpy(copy, str, len);
  38                 copy[len] = '\0';
  39         }
  40
  41         return copy;
  42 }