102 lines
2.1 KiB
C
102 lines
2.1 KiB
C
/* Copyright (C) 1993, 1995, 1996, 1997 Free Software Foundation, Inc.
|
|
|
|
NOTE: The canonical source of this file is maintained with the GNU C Library.
|
|
Bugs can be reported to bug-glibc@prep.ai.mit.edu.
|
|
|
|
This program 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 2, or (at your option) any
|
|
later version.
|
|
|
|
This program 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.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; 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. */
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#ifdef _LIBC
|
|
# include <string.h>
|
|
#else
|
|
# include <sys/types.h>
|
|
#endif
|
|
|
|
#ifndef weak_alias
|
|
# define __stpncpy stpncpy
|
|
#endif
|
|
|
|
/* 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 (dest, src, n)
|
|
char *dest;
|
|
const char *src;
|
|
size_t n;
|
|
{
|
|
char c;
|
|
char *s = dest;
|
|
|
|
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;
|
|
}
|
|
#ifdef weak_alias
|
|
weak_alias (__stpncpy, stpncpy)
|
|
#endif
|