strnlen.h

00001 /*
00002  * Orca-Robotics Project: Components for robotics 
00003  *               http://orca-robotics.sf.net/
00004  * Copyright (c) 2004-2009 Alex Brooks, Christopher Brooks
00005  *
00006  * This distribution is licensed to you under the terms described in
00007  * the LICENSE file included in this distribution.
00008  *
00009  */
00010 #ifndef HYDRO_PORTABILITY_STRNLEN_H
00011 #define HYDRO_PORTABILITY_STRNLEN_H
00012 
00013 // this defines HAVE_STRNLEN
00014 // #include <config.h>
00015 
00016 // eg. Solaris doesn't define strnlen in string.h, so define it here.
00017 #if !HAVE_STRNLEN
00018 
00019 #include <cstring>
00020 
00021 // inline the fucker to guard against multiple inclusion, without the
00022 // hassle of a special lib.
00023 inline size_t strnlen(const char *s, size_t maxlen) 
00024 {
00025     char *p;
00026     if (s == NULL) {
00027         return maxlen;
00028     }
00029     p = (char *)memchr(s, 0, maxlen);
00030     if (p == NULL) {
00031         return maxlen;
00032     }
00033     return ((p - s) + 1);
00034 }
00035 #endif
00036 
00037 #endif