62 lines
2.4 KiB
C
62 lines
2.4 KiB
C
/****************************************************************************
|
|
* libs/libc/string/lib_rawmemchr.c
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* 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 <string.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: rawmemchr
|
|
*
|
|
* Description:
|
|
* The rawmemchr() function is similar to memchr(), it assumes (i.e., the
|
|
* programmer knows for certain) that an instance of c lies somewhere in
|
|
* the memory area starting at the location pointed to by s,and so performs
|
|
* an optimized search for c (i.e., no use of a count argument to limit the
|
|
* range of the search). If an instance of c is not found, the results are
|
|
* unpredictable.The following call is a fast means of locating a string's
|
|
* terminating null byte.
|
|
*
|
|
* Returned Value:
|
|
* The rawmemchr() function returns a pointer to the located byte, or a
|
|
* null pointer if the byte does not occur in the object.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR void *rawmemchr(FAR const void *s, int c)
|
|
{
|
|
if (c != '\0')
|
|
{
|
|
return memchr(s, c, SSIZE_MAX);
|
|
}
|
|
|
|
return (FAR char *)s + strlen(s);
|
|
}
|