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48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
/* memrchr.c - libc replacement function
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* Copyright (C) 2005 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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memrchr() is a GNU function that might not be available everywhere.
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It's basically the inverse of memchr() - search backwards in a
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memory block for a particular character.
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*/
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#include <config.h>
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#include <string.h>
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/* There are many ways to optimize this, but this is a simple
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unoptimized implementation. */
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void *
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memrchr(const void *s, int c, size_t n)
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{
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const unsigned char *start=s,*end=s;
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end+=n-1;
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while(end>=start)
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{
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if(*end==c)
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return (void *)end;
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else
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end--;
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}
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return NULL;
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}
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