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1 | /* Find the length of STRING, but scan at most MAXLEN characters. | |
2 | Copyright (C) 1996, 1997, 1998, 2000-2003 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #if HAVE_CONFIG_H | |
21 | # include <config.h> | |
22 | #endif | |
23 | #undef strnlen | |
24 | ||
25 | #if HAVE_STRING_H | |
26 | # if !STDC_HEADERS && HAVE_MEMORY_H | |
27 | # include <memory.h> | |
28 | # endif | |
29 | # include <string.h> | |
30 | #else | |
31 | # include <strings.h> | |
32 | #endif | |
33 | ||
34 | #ifndef HAVE_DECL_MEMCHR | |
35 | "this configure-time declaration test was not run" | |
36 | #endif | |
37 | #if !HAVE_DECL_MEMCHR | |
38 | char *memchr (); | |
39 | #endif | |
40 | ||
41 | #undef __strnlen | |
42 | #undef strnlen | |
43 | ||
44 | #ifndef _LIBC | |
45 | # define strnlen rpl_strnlen | |
46 | #endif | |
47 | ||
48 | #ifndef weak_alias | |
49 | # define __strnlen strnlen | |
50 | #endif | |
51 | ||
52 | /* Find the length of STRING, but scan at most MAXLEN characters. | |
53 | If no '\0' terminator is found in that many characters, return MAXLEN. */ | |
54 | ||
55 | size_t | |
56 | __strnlen (const char *string, size_t maxlen) | |
57 | { | |
58 | const char *end = memchr (string, '\0', maxlen); | |
59 | return end ? (size_t) (end - string) : maxlen; | |
60 | } | |
61 | #ifdef weak_alias | |
62 | weak_alias (__strnlen, strnlen) | |
63 | #endif |