nuttx/libs/libc/string/lib_strnlen.c

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/****************************************************************************
* libs/libc/string/lib_strnlen.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <string.h>
#include "libc.h"
/****************************************************************************
* Public Functions
****************************************************************************/
#if !defined(CONFIG_LIBC_ARCH_STRNLEN) && defined(LIBC_BUILD_STRING)
size_t strnlen(const char *s, size_t maxlen)
{
const char *sc;
for (sc = s; maxlen != 0 && *sc != '\0'; maxlen--, ++sc);
return sc - s;
}
#endif