69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/****************************************************************************
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* libs/libc/string/lib_strchr.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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#include "libc.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: strchr
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*
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* Description:
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* The strchr() function locates the first occurrence of 'c' (converted to
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* a char) in the string pointed to by 's'. The terminating null byte is
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* considered to be part of the string.
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*
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* Returned Value:
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* Upon completion, strchr() returns a pointer to the byte, or a null
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* pointer if the byte was not found.
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*
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****************************************************************************/
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#if !defined(CONFIG_LIBC_ARCH_STRCHR) && defined(LIBC_BUILD_STRING)
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#undef strchr /* See mm/README.txt */
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FAR char *strchr(FAR const char *s, int c)
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{
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for (; ; s++)
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{
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if (*s == c)
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{
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return (FAR char *)s;
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}
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if (*s == '\0')
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{
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break;
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}
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}
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return NULL;
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}
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#endif
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