1 /* Copyright (C) 1991, 1996, 1997, 2003 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18 #include <string.h>
19
20 #include "memcopy.h"
21
22 /* Compare S1 and S2, returning less than, equal to or
23 greater than zero if S1 is lexicographically less than,
24 equal to or greater than S2. */
strcmp(const char * p1,const char * p2)25 int strcmp (const char *p1, const char *p2)
26 {
27 register const unsigned char *s1 = (const unsigned char *) p1;
28 register const unsigned char *s2 = (const unsigned char *) p2;
29 unsigned reg_char c1, c2;
30
31 do
32 {
33 c1 = (unsigned char) *s1++;
34 c2 = (unsigned char) *s2++;
35 if (c1 == '\0')
36 return c1 - c2;
37 }
38 while (c1 == c2);
39
40 return c1 - c2;
41 }
42 libc_hidden_weak(strcmp)
43
44 #ifndef __UCLIBC_HAS_LOCALE__
45 strong_alias(strcmp,strcoll)
46 libc_hidden_def(strcoll)
47 #endif
48