mirror of git://gcc.gnu.org/git/gcc.git
114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/* Checking strncat.
|
|
Copyright (C) 1991-2019 Free Software Foundation, Inc.
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC 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, or (at your option) any later
|
|
version.
|
|
|
|
In addition to the permissions in the GNU General Public License, the
|
|
Free Software Foundation gives you unlimited permission to link the
|
|
compiled version of this file into combinations with other programs,
|
|
and to distribute those combinations without any restriction coming
|
|
from the use of this file. (The General Public License restrictions
|
|
do apply in other respects; for example, they cover modification of
|
|
the file, and distribution when not linked into a combine
|
|
executable.)
|
|
|
|
GCC 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.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
|
|
#include "config.h"
|
|
#include <ssp/ssp.h>
|
|
#ifdef HAVE_STRING_H
|
|
# include <string.h>
|
|
#endif
|
|
|
|
extern void __chk_fail (void) __attribute__((__noreturn__));
|
|
|
|
char *
|
|
__strncat_chk (char *__restrict__ dest, const char *__restrict__ src,
|
|
size_t n, size_t slen)
|
|
{
|
|
char c;
|
|
char *s = dest;
|
|
|
|
do
|
|
{
|
|
if (slen-- == 0)
|
|
__chk_fail ();
|
|
c = *dest++;
|
|
}
|
|
while (c != '\0');
|
|
|
|
++slen;
|
|
dest -= 2;
|
|
|
|
if (n >= 4)
|
|
{
|
|
size_t n4 = n >> 2;
|
|
do
|
|
{
|
|
if (slen-- == 0)
|
|
__chk_fail ();
|
|
c = *src++;
|
|
*++dest = c;
|
|
if (c == '\0')
|
|
return s;
|
|
if (slen-- == 0)
|
|
__chk_fail ();
|
|
c = *src++;
|
|
*++dest = c;
|
|
if (c == '\0')
|
|
return s;
|
|
if (slen-- == 0)
|
|
__chk_fail ();
|
|
c = *src++;
|
|
*++dest = c;
|
|
if (c == '\0')
|
|
return s;
|
|
if (slen-- == 0)
|
|
__chk_fail ();
|
|
c = *src++;
|
|
*++dest = c;
|
|
if (c == '\0')
|
|
return s;
|
|
} while (--n4 > 0);
|
|
n &= 3;
|
|
}
|
|
|
|
while (n > 0)
|
|
{
|
|
if (slen-- == 0)
|
|
__chk_fail ();
|
|
c = *src++;
|
|
*++dest = c;
|
|
if (c == '\0')
|
|
return s;
|
|
n--;
|
|
}
|
|
|
|
if (c != '\0')
|
|
{
|
|
if (slen-- == 0)
|
|
__chk_fail ();
|
|
*++dest = '\0';
|
|
}
|
|
|
|
return s;
|
|
}
|