From a89864a20b818621a1da10e88fda815334062f9f Mon Sep 17 00:00:00 2001 From: Elliott Hughes Date: Mon, 1 Oct 2012 17:35:49 -0700 Subject: Move non-upstream code into the libc/bionic directory. I'll need at least one more pass, because there's some upstream code lurking in libc/bionic, but this is still a step in the right direction. Change-Id: I55927315972da8327ae01c5240ed587db17e8462 --- libc/bionic/memcmp.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 libc/bionic/memcmp.c (limited to 'libc/bionic/memcmp.c') diff --git a/libc/bionic/memcmp.c b/libc/bionic/memcmp.c new file mode 100644 index 0000000..8640954 --- /dev/null +++ b/libc/bionic/memcmp.c @@ -0,0 +1,51 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ +#include + +int memcmp(const void *s1, const void *s2, size_t n) +{ + const unsigned char* p1 = s1; + const unsigned char* end1 = p1 + n; + const unsigned char* p2 = s2; + int d = 0; + + for (;;) { + if (d || p1 >= end1) break; + d = (int)*p1++ - (int)*p2++; + + if (d || p1 >= end1) break; + d = (int)*p1++ - (int)*p2++; + + if (d || p1 >= end1) break; + d = (int)*p1++ - (int)*p2++; + + if (d || p1 >= end1) break; + d = (int)*p1++ - (int)*p2++; + } + return d; +} -- cgit v1.1