/* Copyright (C) 1991 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 General Public License as published by
the Free Software Foundation; either version 1, 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with the GNU C Library; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include
#include
#include
char *
DEFUN(strncat, (s1, s2, n), char *s1 AND CONST char *s2 AND size_t n)
{
reg_char c;
char *s = s1;
/* Find the end of S1. */
do
c = *s1++;
while (c != '\0');
/* Make S1 point before next character, so we can increment
it while memory is read (wins on pipelined cpus). */
s1 -= 2;
if (n >= 4)
{
size_t n4 = n >> 2;
do
{
c = *s2++;
*++s1 = c;
if (c == '\0')
return s;
c = *s2++;
*++s1 = c;
if (c == '\0')
return s;
c = *s2++;
*++s1 = c;
if (c == '\0')
return s;
c = *s2++;
*++s1 = c;
if (c == '\0')
return s;
} while (--n4 > 0);
n &= 3;
}
while (n > 0)
{
c = *s2++;
*++s1 = c;
if (c == '\0')
return s;
n--;
}
if (c != '\0')
*++s1 = '\0';
return s;
}