strnlen.c

00001 /* Find the length of STRING, but scan at most MAXLEN characters.
00002    Copyright (C) 1996, 1997, 1998, 2000-2003 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    This program is free software; you can redistribute it and/or modify
00006    it under the terms of the GNU Lesser General Public License as published by
00007    the Free Software Foundation; either version 2.1, or (at your option)
00008    any later version.
00009 
00010    This program is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013    GNU Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public License along
00016    with this program; if not, write to the Free Software Foundation,
00017    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
00018 
00019 #ifdef HAVE_CONFIG_H
00020 # include <config.h>
00021 #endif
00022 #undef strnlen
00023 
00024 #include <string.h>
00025 
00026 #undef __strnlen
00027 #undef strnlen
00028 
00029 #ifndef _LIBC
00030 # define strnlen rpl_strnlen
00031 #endif
00032 
00033 #ifndef weak_alias
00034 # define __strnlen strnlen
00035 #endif
00036 
00037 /* Find the length of STRING, but scan at most MAXLEN characters.
00038    If no '\0' terminator is found in that many characters, return MAXLEN.  */
00039 
00040 size_t
00041 __strnlen (const char *string, size_t maxlen)
00042 {
00043   const char *end = memchr (string, '\0', maxlen);
00044   return end ? (size_t) (end - string) : maxlen;
00045 }
00046 #ifdef weak_alias
00047 weak_alias (__strnlen, strnlen)
00048 #endif

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