1 /* Copyright (C) 1996-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #ifdef HAVE_CONFIG_H
19 # include "config.h"
20 #endif
21
22 #include <stdio.h>
23 #include <sys/types.h>
24
25 #if defined _LIBC || defined STDC_HEADERS
26 # include <stdlib.h>
27 # include <string.h>
28 #else
29 char *malloc ();
30 #endif
31
32 #undef __strndup
33 #undef strndup
34
35 #ifndef weak_alias
36 # define __strndup strndup
37 #endif
38
39 char *
__strndup(const char * s,size_t n)40 __strndup (const char *s, size_t n)
41 {
42 size_t len = __strnlen (s, n);
43 char *new = (char *) malloc (len + 1);
44
45 if (new == NULL)
46 return NULL;
47
48 new[len] = '\0';
49 return (char *) memcpy (new, s, len);
50 }
51 #ifdef libc_hidden_def
52 libc_hidden_def (__strndup)
53 #endif
54 #ifdef weak_alias
55 weak_alias (__strndup, strndup)
56 #endif
57