56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/****************************************************************************
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* libs/libc/string/lib_bstrnlen.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdlib.h>
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#if !defined(CONFIG_ENDIAN_BIG) && CHAR_BIT != 8
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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size_t bstrnlen(FAR const char *src, size_t maxlen)
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{
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size_t len = 0;
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while (1)
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{
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int i;
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for (i = 0; i < CHAR_BIT; i += 8, len++)
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{
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if (maxlen-- == 0 || ((*src >> i) & 0xff) == 0)
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{
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return len;
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}
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}
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src++;
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}
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}
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#endif
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