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libc/lib_bzero:Add bzero prototype.

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Implement the bzero function as an alternative to macro expansion.

and support gcc FORTIFY_SOURCE features for nuttx libc

This function will use gcc's function
__builtin_dynamic_object_size and __builtin_object_size

Its function is to obtain the size of the object through compilation,
so as to judge whether there are out-of-bounds operations in commonly used functions.
It should be noted that the option -O2 and above is required to enable this function

Signed-off-by: zhanghongyu <zhanghongyu@xiaomi.com>
This commit is contained in:
zhanghongyu
2024-05-07 15:06:07 +08:00
committed by Alin Jerpelea
parent 4ffad2656e
commit 908814a575
3 changed files with 44 additions and 6 deletions
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libs/libc/string/Make.defs
+1 -1
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@@ -30,7 +30,7 @@ CSRCS += lib_strndup.c lib_strcasestr.c lib_strpbrk.c lib_strrchr.c
CSRCS += lib_strspn.c lib_strstr.c lib_strtok.c lib_strtokr.c
CSRCS += lib_strsep.c lib_strerrorr.c lib_explicit_bzero.c lib_strsignal.c
CSRCS += lib_index.c lib_rindex.c lib_timingsafe_bcmp.c lib_strverscmp.c
CSRCS += lib_mempcpy.c lib_rawmemchr.c
CSRCS += lib_mempcpy.c lib_rawmemchr.c lib_bzero.c
CSRCS += lib_memchr.c lib_memcmp.c lib_memmove.c lib_memset.c
CSRCS += lib_strchr.c lib_strcmp.c lib_strcpy.c lib_strlcat.c
libs/libc/string/lib_bzero.c
+40
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@@ -0,0 +1,40 @@
/****************************************************************************
* libs/libc/string/lib_bzero.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <strings.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: bzero
****************************************************************************/
void bzero(FAR void *s, size_t n)
{
memset(s, 0, n);
}