1 /* Copyright (C) 1991-2013 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, see
16 <http://www.gnu.org/licenses/>. */
24 #define STRNCMP strncmp
27 /* Compare no more than N characters of S1 and S2,
28 returning less than, equal to or greater than zero
29 if S1 is lexicographically less than, equal to or
32 STRNCMP (const char *s1, const char *s2, size_t n)
34 unsigned char c1 = '\0';
35 unsigned char c2 = '\0';
42 c1 = (unsigned char) *s1++;
43 c2 = (unsigned char) *s2++;
44 if (c1 == '\0' || c1 != c2)
46 c1 = (unsigned char) *s1++;
47 c2 = (unsigned char) *s2++;
48 if (c1 == '\0' || c1 != c2)
50 c1 = (unsigned char) *s1++;
51 c2 = (unsigned char) *s2++;
52 if (c1 == '\0' || c1 != c2)
54 c1 = (unsigned char) *s1++;
55 c2 = (unsigned char) *s2++;
56 if (c1 == '\0' || c1 != c2)
64 c1 = (unsigned char) *s1++;
65 c2 = (unsigned char) *s2++;
66 if (c1 == '\0' || c1 != c2)
74 libc_hidden_builtin_def (STRNCMP)