mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-18 02:50:09 +00:00
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
|
/* 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 Library General Public License as
|
||
|
|
published by the Free Software Foundation; either version 2 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
|
||
|
|
Library General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Library General Public
|
||
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
||
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
||
|
|
Cambridge, MA 02139, USA. */
|
||
|
|
|
||
|
|
#include <ansidecl.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <memcopy.h>
|
||
|
|
|
||
|
|
/* Compare no more than N characters of S1 and S2,
|
||
|
|
returning less than, equal to or greater than zero
|
||
|
|
if S1 is lexiographically less than, equal to or
|
||
|
|
greater than S2. */
|
||
|
|
int
|
||
|
|
DEFUN(strncmp, (s1, s2, n),
|
||
|
|
CONST char *s1 AND CONST char *s2 AND size_t n)
|
||
|
|
{
|
||
|
|
unsigned reg_char c1 = '\0';
|
||
|
|
unsigned reg_char c2 = '\0';
|
||
|
|
|
||
|
|
if (n >= 4)
|
||
|
|
{
|
||
|
|
size_t n4 = n >> 2;
|
||
|
|
do
|
||
|
|
{
|
||
|
|
c1 = (unsigned char) *s1++;
|
||
|
|
c2 = (unsigned char) *s2++;
|
||
|
|
if (c1 == '\0' || c1 != c2)
|
||
|
|
return c1 - c2;
|
||
|
|
c1 = (unsigned char) *s1++;
|
||
|
|
c2 = (unsigned char) *s2++;
|
||
|
|
if (c1 == '\0' || c1 != c2)
|
||
|
|
return c1 - c2;
|
||
|
|
c1 = (unsigned char) *s1++;
|
||
|
|
c2 = (unsigned char) *s2++;
|
||
|
|
if (c1 == '\0' || c1 != c2)
|
||
|
|
return c1 - c2;
|
||
|
|
c1 = (unsigned char) *s1++;
|
||
|
|
c2 = (unsigned char) *s2++;
|
||
|
|
if (c1 == '\0' || c1 != c2)
|
||
|
|
return c1 - c2;
|
||
|
|
} while (--n4 > 0);
|
||
|
|
n &= 3;
|
||
|
|
}
|
||
|
|
|
||
|
|
while (n > 0)
|
||
|
|
{
|
||
|
|
c1 = (unsigned char) *s1++;
|
||
|
|
c2 = (unsigned char) *s2++;
|
||
|
|
if (c1 == '\0' || c1 != c2)
|
||
|
|
return c1 - c2;
|
||
|
|
n--;
|
||
|
|
}
|
||
|
|
|
||
|
|
return c1 - c2;
|
||
|
|
}
|