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anjiahao
7c96537a58
This allows the compiler to automatically identify which string functions can be compiled into libraries, and the compiler's internal implementation is faster than libc functions. Signed-off-by: anjiahao <anjiahao@xiaomi.com>
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/****************************************************************************
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* libs/libc/string/lib_bsdstrrchr.c
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*
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* Copyright (c) 1994-2009 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the BSD License. This program is distributed in the hope that
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* it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
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* including the implied warranties of MERCHANTABILITY or FITNESS FOR
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* A PARTICULAR PURPOSE. A copy of this license is available at
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* http://www.opensource.org/licenses. Any Red Hat trademarks that are
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* incorporated in the source code or documentation are not subject to
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* the BSD License and may only be used or replicated with the express
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* permission of Red Hat, Inc.
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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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/* The strrchr() function returns a pointer to the last
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* occurrence of the character c in the string s.
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*/
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#if !defined(CONFIG_LIBC_ARCH_STRRCHR) && defined(LIBC_BUILD_STRRCHR)
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#undef strrchr
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no_builtin("strrchr")
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FAR char *strrchr(FAR const char *s, int c)
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{
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FAR const char *last = NULL;
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if (c)
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{
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while ((s = strchr(s, c)))
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{
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last = s;
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s++;
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}
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}
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else
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{
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last = strchr(s, c);
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}
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return (FAR char *)last;
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}
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#endif
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