lib/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2025-07-29 11:41:21 +03:00
Code Activity

Implement strlcpy and strlcat [BZ #178]

Browse Source 
These functions are about to be added to POSIX, under Austin Group
issue 986.

The fortified strlcat implementation does not raise SIGABRT if the
destination buffer does not contain a null terminator, it just
inherits the non-failing regular strlcat behavior.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Florian Weimer
2023-06-14 18:10:08 +02:00
parent 7ba426a111
commit 454a20c875
50 changed files with 560 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
string/strlcpy.c Normal file
View File

@ -0,0 +1,46 @@
/* Copy a null-terminated string to a fixed-size buffer, with length checking.
Copyright (C) 2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU 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 2.1 of the License, or (at your option) any later version.
The GNU 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 GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <string.h>
size_t
__strlcpy (char *__restrict dest, const char *__restrict src, size_t size)
{
size_t src_length = strlen (src);
if (__glibc_unlikely (src_length >= size))
{
if (size > 0)
{
/* Copy the leading portion of the string. The last
character is subsequently overwritten with the NUL
terminator, but the destination size is usually a
multiple of a small power of two, so writing it twice
should be more efficient than copying an odd number of
bytes. */
memcpy (dest, src, size);
dest[size - 1] = '\0';
}
}
else
/* Copy the string and its terminating NUL character. */
memcpy (dest, src, src_length + 1);
return src_length;
}
libc_hidden_def (__strlcpy)
weak_alias (__strlcpy, strlcpy)