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libc/string: add lib_strchrnul.

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Change-Id: I25e2424e91b833815680d2e417f4384ed9062660
Signed-off-by: pengyiqiang <pengyiqiang@xiaomi.com>
This commit is contained in:
pengyiqiang
2021-08-20 16:08:04 +08:00
parent 6eb29f9715
commit 57e4394dbd
2 changed files with 59 additions and 1 deletions
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libs/libc/string/Make.defs
+1 -1
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@@ -25,7 +25,7 @@ CSRCS += lib_flsll.c lib_isbasedigit.c
CSRCS += lib_memccpy.c lib_memcmp.c lib_memrchr.c
CSRCS += lib_popcount.c lib_popcountl.c lib_popcountll.c
CSRCS += lib_skipspace.c lib_stpcpy.c lib_stpncpy.c lib_strcasecmp.c
CSRCS += lib_strcat.c lib_strchr.c lib_strcspn.c
CSRCS += lib_strcat.c lib_strchr.c lib_strchrnul.c lib_strcspn.c
CSRCS += lib_strdup.c lib_strerror.c lib_strnlen.c
CSRCS += lib_strncasecmp.c lib_strncat.c lib_strncmp.c lib_strncpy.c
CSRCS += lib_strndup.c lib_strcasestr.c lib_strpbrk.c lib_strrchr.c
libs/libc/string/lib_strchrnul.c
+58
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@@ -0,0 +1,58 @@
/****************************************************************************
* libs/libc/string/lib_strchrnul.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 <string.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: strchrnul
*
* Description:
* The strchrnul() function locates the first occurrence of 'c' (converted
* to a char) in the string pointed to by 's'. The terminating null byte is
* considered to be part of the string.
*
* Returned Value:
* Upon completion, strchrnull() returns a pointer to the byte, or a
* pointer to null if the byte was not found.
*
****************************************************************************/
FAR char *strchrnul(FAR const char *s, int c)
{
if (s)
{
while (*s && *s != c)
{
s++;
}
}
return s;
}