mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 09:30:06 +00:00
90 lines
1.7 KiB
C
90 lines
1.7 KiB
C
/* Copyright (C) 1991, 1997, 2003, 2004 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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <string.h>
|
|
#include <memcopy.h>
|
|
|
|
|
|
char *
|
|
__strncpy_chk (s1, s2, n, s1len)
|
|
char *s1;
|
|
const char *s2;
|
|
size_t n;
|
|
size_t s1len;
|
|
{
|
|
reg_char c;
|
|
char *s = s1;
|
|
|
|
if (__builtin_expect (s1len < n, 0))
|
|
__chk_fail ();
|
|
|
|
--s1;
|
|
|
|
if (n >= 4)
|
|
{
|
|
size_t n4 = n >> 2;
|
|
|
|
for (;;)
|
|
{
|
|
c = *s2++;
|
|
*++s1 = c;
|
|
if (c == '\0')
|
|
break;
|
|
c = *s2++;
|
|
*++s1 = c;
|
|
if (c == '\0')
|
|
break;
|
|
c = *s2++;
|
|
*++s1 = c;
|
|
if (c == '\0')
|
|
break;
|
|
c = *s2++;
|
|
*++s1 = c;
|
|
if (c == '\0')
|
|
break;
|
|
if (--n4 == 0)
|
|
goto last_chars;
|
|
}
|
|
n = n - (s1 - s) - 1;
|
|
if (n == 0)
|
|
return s;
|
|
goto zero_fill;
|
|
}
|
|
|
|
last_chars:
|
|
n &= 3;
|
|
if (n == 0)
|
|
return s;
|
|
|
|
do
|
|
{
|
|
c = *s2++;
|
|
*++s1 = c;
|
|
if (--n == 0)
|
|
return s;
|
|
}
|
|
while (c != '\0');
|
|
|
|
zero_fill:
|
|
do
|
|
*++s1 = '\0';
|
|
while (--n > 0);
|
|
|
|
return s;
|
|
}
|