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, see
16 <http://www.gnu.org/licenses/>. */
21 /* Compare no more than N characters of S1 and S2,
22 returning less than, equal to or greater than zero
23 if S1 is lexicographically less than, equal to or
25 int strncmp (const char *s1, const char *s2, size_t n)
27 unsigned reg_char c1 = '\0';
28 unsigned reg_char c2 = '\0';
35 c1 = (unsigned char) *s1++;
36 c2 = (unsigned char) *s2++;
37 if (c1 == '\0' || c1 != c2)
39 c1 = (unsigned char) *s1++;
40 c2 = (unsigned char) *s2++;
41 if (c1 == '\0' || c1 != c2)
43 c1 = (unsigned char) *s1++;
44 c2 = (unsigned char) *s2++;
45 if (c1 == '\0' || c1 != c2)
47 c1 = (unsigned char) *s1++;
48 c2 = (unsigned char) *s2++;
49 if (c1 == '\0' || c1 != c2)
57 c1 = (unsigned char) *s1++;
58 c2 = (unsigned char) *s2++;
59 if (c1 == '\0' || c1 != c2)
66 libc_hidden_weak(strncmp)