From ff2f219b6ff621c84bb57f350e73364ca5d878e6 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Tue, 1 Sep 2015 17:29:24 +0200 Subject: add memfrob MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- src/string/memfrob.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 src/string/memfrob.c (limited to 'src/string') diff --git a/src/string/memfrob.c b/src/string/memfrob.c new file mode 100644 index 0000000..e43496a --- /dev/null +++ b/src/string/memfrob.c @@ -0,0 +1,39 @@ +/** + * slibc — Yet another C library + * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org) + * + * This program 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. + * + * This program 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 . + */ +#include +#include + + + +/** + * Performs an inplace bitwise XOR:ing of + * a memory segment. The pattern is 00101010. + * + * This is a GNU extension. + * + * @param segment The memory segment. + * @param size The size of the memory segment. + * @return `segment` is returned + */ +char* memfrob(char* segment, size_t size) +{ + while (--size) + segment[size] ^= 0x2A; + return segment; +} + -- cgit v1.2.3-70-g09d2