mirror of
git://git.gnupg.org/gnupg.git
synced 2024-12-23 10:29:58 +01:00
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
/* memrchr.c - libc replacement function
|
|
* Copyright (C) 2005 Free Software Foundation, Inc.
|
|
*
|
|
* This file is part of GnuPG.
|
|
*
|
|
* GnuPG is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GnuPG is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/*
|
|
memrchr() is a GNU function that might not be available everywhere.
|
|
It's basically the inverse of memchr() - search backwards in a
|
|
memory block for a particular character.
|
|
*/
|
|
|
|
#include <config.h>
|
|
#include <string.h>
|
|
|
|
/* There are many ways to optimize this, but this is a simple
|
|
unoptimized implementation. */
|
|
void *
|
|
memrchr(const void *s, int c, size_t n)
|
|
{
|
|
const unsigned char *start=s,*end=s;
|
|
|
|
end+=n-1;
|
|
|
|
while(end>=start)
|
|
{
|
|
if(*end==c)
|
|
return (void *)end;
|
|
else
|
|
end--;
|
|
}
|
|
|
|
return NULL;
|
|
}
|