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Add explicit_bzero(3).

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Jonas 'Sortie' Termansen 2014-06-20 18:29:15 +02:00
parent 4ee15987fa
commit 95fcb94648
3 changed files with 36 additions and 0 deletions
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1
libc/Makefile
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@ -184,6 +184,7 @@ stdlib/strtoull.o \
stdlib/strtoul.o \
stdlib/wcstombs.o \
stdlib/wctomb.o \
string/explicit_bzero.o \
string/ffsll.o \
string/ffsl.o \
string/ffs.o \

1
libc/include/string.h
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@ -124,6 +124,7 @@ size_t strxfrm_l(char* __restrict, const char* __restrict, size_t, locale_t);
/* Functions copied from elsewhere. */
#if __USE_SORTIX
void explicit_bzero(void*, size_t);
int ffsl(long int);
void* memrchr(const void*, int, size_t);
/* TODO: strcasecmp_l */

34
libc/string/explicit_bzero.cpp Normal file
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@ -0,0 +1,34 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2014.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
string/explicit_bzero.cpp
Initializes a region of memory to a byte value in a manner that is not
optimized away by the compiler.
*******************************************************************************/
#include <string.h>
// TODO: Employ special compiler support to ensure this is not optimized away.
extern "C" void explicit_bzero(void* dest_ptr, size_t size)
{
volatile unsigned char* dest = (volatile unsigned char*) dest_ptr;
for ( size_t i = 0; i < size; i++ )
dest[i] = 0;
}