common/lib/libc/string/strnlen.c

   1 /*      $NetBSD: strnlen.c,v 1.2 2014/01/09 11:25:11 apb Exp $  */
   2
   3 /*-
   4  * Copyright (c) 2009 David Schultz <das@FreeBSD.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #if HAVE_NBTOOL_CONFIG_H
  30 #include "nbtool_config.h"
  31 #endif
  32
  33 #include <sys/cdefs.h>
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 __RCSID("$NetBSD: strnlen.c,v 1.2 2014/01/09 11:25:11 apb Exp $");
  36 #endif /* LIBC_SCCS and not lint */
  37 /* FreeBSD: src/lib/libc/string/strnlen.c,v 1.1 2009/02/28 06:00:58 das Exp */
  38
  39 #if !defined(_KERNEL) && !defined(_STANDALONE)
  40 #include <string.h>
  41 #else
  42 #include <lib/libkern/libkern.h>
  43 #endif
  44
  45 #if !HAVE_STRNLEN
  46 size_t
  47 strnlen(const char *s, size_t maxlen)
  48 {
  49         size_t len;
  50
  51         for (len = 0; len < maxlen; len++, s++) {
  52                 if (!*s)
  53                         break;
  54         }
  55         return (len);
  56 }
  57 #endif /* !HAVE_STRNLEN */