60 lines
2.3 KiB
C
60 lines
2.3 KiB
C
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/****************************************************************************
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* libs/libc/string/lib_rawmemchr.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 <string.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: rawmemchr
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*
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* Description:
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* The rawmemchr() function is similar to memchr(), it assumes (i.e., the
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* programmer knows for certain) that an instance of c lies somewhere in
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* the memory area starting at the location pointed to by s,and so performs
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* an optimized search for c (i.e., no use of a count argument to limit the
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* range of the search). If an instance of c is not found, the results are
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* unpredictable.The following call is a fast means of locating a string's
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* terminating null byte.
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*
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* Returned Value:
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* The rawmemchr() function returns a pointer to the located byte, or a
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* null pointer if the byte does not occur in the object.
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*
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****************************************************************************/
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FAR void *rawmemchr(FAR const void *s, int c)
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{
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if (c != '\0')
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{
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return memchr(s, c, SSIZE_MAX);
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}
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return (FAR char *)s + strlen(s);
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}
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