1/* Copyright (C) 1991-2022 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 <https://www.gnu.org/licenses/>. */
17
18#include <string.h>
19
20#undef strcmp
21
22#ifndef STRCMP
23# define STRCMP strcmp
24#endif
25
26/* Compare S1 and S2, returning less than, equal to or
27 greater than zero if S1 is lexicographically less than,
28 equal to or greater than S2. */
29int
30STRCMP (const char *p1, const char *p2)
31{
32 const unsigned char *s1 = (const unsigned char *) p1;
33 const unsigned char *s2 = (const unsigned char *) p2;
34 unsigned char c1, c2;
35
36 do
37 {
38 c1 = (unsigned char) *s1++;
39 c2 = (unsigned char) *s2++;
40 if (c1 == '\0')
41 return c1 - c2;
42 }
43 while (c1 == c2);
44
45 return c1 - c2;
46}
47libc_hidden_builtin_def (strcmp)
48

source code of glibc/string/strcmp.c