diff options
| -rw-r--r-- | include/string.h | 1 | ||||
| -rw-r--r-- | libc/string/explicit_bzero.c | 30 |
2 files changed, 31 insertions, 0 deletions
diff --git a/include/string.h b/include/string.h index 5ffd97150..1dc994df7 100644 --- a/include/string.h +++ b/include/string.h @@ -344,6 +344,7 @@ extern void __bzero (void *__s, size_t __n) __THROW __nonnull ((1)); #endif #ifdef __USE_BSD +extern void explicit_bzero (void *__d, size_t __n); # ifdef __UCLIBC_SUSV3_LEGACY__ /* Copy N bytes of SRC to DEST (like memmove, but args reversed). */ extern void bcopy (const void *__src, void *__dest, size_t __n) diff --git a/libc/string/explicit_bzero.c b/libc/string/explicit_bzero.c new file mode 100644 index 000000000..b09e4c1f4 --- /dev/null +++ b/libc/string/explicit_bzero.c @@ -0,0 +1,30 @@ +/* +Copyright © 2005-2020 Rich Felker, et al. + +Permission is hereby granted, free of charge, to any person obtaining +a copy of this software and associated documentation files (the +"Software"), to deal in the Software without restriction, including +without limitation the rights to use, copy, modify, merge, publish, +distribute, sublicense, and/or sell copies of the Software, and to +permit persons to whom the Software is furnished to do so, subject to +the following conditions: + +The above copyright notice and this permission notice shall be +included in all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. +IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY +CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, +TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE +SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +*/ +#define _BSD_SOURCE +#include <string.h> + +void explicit_bzero(void *d, size_t n) +{ + d = memset(d, 0, n); + __asm__ __volatile__ ("" : : "r"(d) : "memory"); +} |