86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
/* Copyright (C) 1993,1995,1996,1997,2002,2005 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. */
|
|
|
|
/* This is almost copied from strncpy.c, written by Torbjorn Granlund. */
|
|
|
|
#include <string.h>
|
|
|
|
|
|
/* Copy no more than N characters of SRC to DEST, returning the address of
|
|
the terminating '\0' in DEST, if any, or else DEST + N. */
|
|
char *
|
|
__stpncpy_chk (char *dest, const char *src, size_t n, size_t destlen)
|
|
{
|
|
char c;
|
|
char *s = dest;
|
|
|
|
if (__builtin_expect (destlen < n, 0))
|
|
__chk_fail ();
|
|
|
|
if (n >= 4)
|
|
{
|
|
size_t n4 = n >> 2;
|
|
|
|
for (;;)
|
|
{
|
|
c = *src++;
|
|
*dest++ = c;
|
|
if (c == '\0')
|
|
break;
|
|
c = *src++;
|
|
*dest++ = c;
|
|
if (c == '\0')
|
|
break;
|
|
c = *src++;
|
|
*dest++ = c;
|
|
if (c == '\0')
|
|
break;
|
|
c = *src++;
|
|
*dest++ = c;
|
|
if (c == '\0')
|
|
break;
|
|
if (--n4 == 0)
|
|
goto last_chars;
|
|
}
|
|
n -= dest - s;
|
|
goto zero_fill;
|
|
}
|
|
|
|
last_chars:
|
|
n &= 3;
|
|
if (n == 0)
|
|
return dest;
|
|
|
|
for (;;)
|
|
{
|
|
c = *src++;
|
|
--n;
|
|
*dest++ = c;
|
|
if (c == '\0')
|
|
break;
|
|
if (n == 0)
|
|
return dest;
|
|
}
|
|
|
|
zero_fill:
|
|
while (n-- > 0)
|
|
dest[n] = '\0';
|
|
|
|
return dest - 1;
|
|
}
|