From 16ae5ca1c6b411bcbd2d9a1cd79db1e66ed1cfaa Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Sun, 30 Aug 2015 14:47:16 +0200 Subject: add bzero and explicit_bzero MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- src/strings/bzero.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 src/strings/bzero.c (limited to 'src') diff --git a/src/strings/bzero.c b/src/strings/bzero.c new file mode 100644 index 0000000..ab7a5f8 --- /dev/null +++ b/src/strings/bzero.c @@ -0,0 +1,55 @@ +/** + * 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 + + + +/** + * `memset`, except calls to it cannot be removed by the compiler. + */ +void* (volatile *__slibc_explicit_memset)(void*, int, size_t) = memset; + + + +/** + * Override a memory segment with zeroes. + * + * @param segment The memory segment to override. + * @param size The size of the memory segment. + */ +void bzero(void* segment, size_t size) +{ + memset(segment, 0, size); +} + + +/** + * Override a memory segment with zeroes. + * + * Unlike `bzero` and `memset`, calls to this function + * cannot be removed, as an optimisation, by the compiler. + * + * @param segment The memory segment to override. + * @param size The size of the memory segment. + */ +void explicit_bzero(void* segment, size_t size) +{ + __slibc_explicit_memset(segment, 0, size); +} + -- cgit v1.2.3-70-g09d2