.
[glibc/history.git] / string / strcmp.c
blobbd53c05c6e21130b091bd75c3fc93872dd71fe4b
1 /* Copyright (C) 1991, 1996, 1997, 2003 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
19 #include <string.h>
20 #include <memcopy.h>
22 #undef strcmp
24 /* Compare S1 and S2, returning less than, equal to or
25 greater than zero if S1 is lexicographically less than,
26 equal to or greater than S2. */
27 int
28 strcmp (p1, p2)
29 const char *p1;
30 const char *p2;
32 register const unsigned char *s1 = (const unsigned char *) p1;
33 register const unsigned char *s2 = (const unsigned char *) p2;
34 unsigned reg_char c1, c2;
38 c1 = (unsigned char) *s1++;
39 c2 = (unsigned char) *s2++;
40 if (c1 == '\0')
41 return c1 - c2;
43 while (c1 == c2);
45 return c1 - c2;
47 libc_hidden_builtin_def (strcmp)