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authorThomas Guyot-Sionnest <dermoth@aei.ca>2014-01-29 03:04:05 -0500
committerThomas Guyot-Sionnest <dermoth@aei.ca>2014-01-29 03:04:05 -0500
commit55f97c2021bf920b62148ea31fdf56d95572d944 (patch)
tree065722942d1281bf87cec98bf487f72645d9349e /gl/strncasecmp.c
parentfc9fbe1e89ac7b8349f65f1953a5e432f0cc3846 (diff)
downloadmonitoring-plugins-55f97c2021bf920b62148ea31fdf56d95572d944.tar.gz
Add strcase gnulib module
Diffstat (limited to 'gl/strncasecmp.c')
-rw-r--r--gl/strncasecmp.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/gl/strncasecmp.c b/gl/strncasecmp.c
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1/* strncasecmp.c -- case insensitive string comparator
2 Copyright (C) 1998-1999, 2005-2007, 2009-2013 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3, or (at your option)
7 any later version.
8
9 This program 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
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, see <http://www.gnu.org/licenses/>. */
16
17#include <config.h>
18
19/* Specification. */
20#include <string.h>
21
22#include <ctype.h>
23#include <limits.h>
24
25#define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
26
27/* Compare no more than N bytes of strings S1 and S2, ignoring case,
28 returning less than, equal to or greater than zero if S1 is
29 lexicographically less than, equal to or greater than S2.
30 Note: This function cannot work correctly in multibyte locales. */
31
32int
33strncasecmp (const char *s1, const char *s2, size_t n)
34{
35 register const unsigned char *p1 = (const unsigned char *) s1;
36 register const unsigned char *p2 = (const unsigned char *) s2;
37 unsigned char c1, c2;
38
39 if (p1 == p2 || n == 0)
40 return 0;
41
42 do
43 {
44 c1 = TOLOWER (*p1);
45 c2 = TOLOWER (*p2);
46
47 if (--n == 0 || c1 == '\0')
48 break;
49
50 ++p1;
51 ++p2;
52 }
53 while (c1 == c2);
54
55 if (UCHAR_MAX <= INT_MAX)
56 return c1 - c2;
57 else
58 /* On machines where 'char' and 'int' are types of the same size, the
59 difference of two 'unsigned char' values - including the sign bit -
60 doesn't fit in an 'int'. */
61 return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0);
62}