1*75f6d617Schristos /* $NetBSD: strcasecmp.c,v 1.1.1.1 2016/01/13 03:15:30 christos Exp $ */
2*75f6d617Schristos
3*75f6d617Schristos /* strcasecmp.c -- case insensitive string comparator
4*75f6d617Schristos Copyright (C) 1998, 1999 Free Software Foundation, Inc.
5*75f6d617Schristos
6*75f6d617Schristos This program is free software; you can redistribute it and/or modify
7*75f6d617Schristos it under the terms of the GNU General Public License as published by
8*75f6d617Schristos the Free Software Foundation; either version 2, or (at your option)
9*75f6d617Schristos any later version.
10*75f6d617Schristos
11*75f6d617Schristos This program is distributed in the hope that it will be useful,
12*75f6d617Schristos but WITHOUT ANY WARRANTY; without even the implied warranty of
13*75f6d617Schristos MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14*75f6d617Schristos GNU General Public License for more details.
15*75f6d617Schristos
16*75f6d617Schristos You should have received a copy of the GNU General Public License
17*75f6d617Schristos along with this program; if not, write to the Free Software Foundation,
18*75f6d617Schristos Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19*75f6d617Schristos
20*75f6d617Schristos #if HAVE_CONFIG_H
21*75f6d617Schristos # include <config.h>
22*75f6d617Schristos #endif
23*75f6d617Schristos
24*75f6d617Schristos #ifdef LENGTH_LIMIT
25*75f6d617Schristos # define STRXCASECMP_FUNCTION strncasecmp
26*75f6d617Schristos # define STRXCASECMP_DECLARE_N , size_t n
27*75f6d617Schristos # define LENGTH_LIMIT_EXPR(Expr) Expr
28*75f6d617Schristos #else
29*75f6d617Schristos # define STRXCASECMP_FUNCTION strcasecmp
30*75f6d617Schristos # define STRXCASECMP_DECLARE_N /* empty */
31*75f6d617Schristos # define LENGTH_LIMIT_EXPR(Expr) 0
32*75f6d617Schristos #endif
33*75f6d617Schristos
34*75f6d617Schristos #include <sys/types.h>
35*75f6d617Schristos #include <ctype.h>
36*75f6d617Schristos
37*75f6d617Schristos #define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
38*75f6d617Schristos
39*75f6d617Schristos /* Compare {{no more than N characters of }}strings S1 and S2,
40*75f6d617Schristos ignoring case, returning less than, equal to or
41*75f6d617Schristos greater than zero if S1 is lexicographically less
42*75f6d617Schristos than, equal to or greater than S2. */
43*75f6d617Schristos
44*75f6d617Schristos int
STRXCASECMP_FUNCTION(const char * s1,const char * s2 STRXCASECMP_DECLARE_N)45*75f6d617Schristos STRXCASECMP_FUNCTION (const char *s1, const char *s2 STRXCASECMP_DECLARE_N)
46*75f6d617Schristos {
47*75f6d617Schristos register const unsigned char *p1 = (const unsigned char *) s1;
48*75f6d617Schristos register const unsigned char *p2 = (const unsigned char *) s2;
49*75f6d617Schristos unsigned char c1, c2;
50*75f6d617Schristos
51*75f6d617Schristos if (p1 == p2 || LENGTH_LIMIT_EXPR (n == 0))
52*75f6d617Schristos return 0;
53*75f6d617Schristos
54*75f6d617Schristos do
55*75f6d617Schristos {
56*75f6d617Schristos c1 = TOLOWER (*p1);
57*75f6d617Schristos c2 = TOLOWER (*p2);
58*75f6d617Schristos
59*75f6d617Schristos if (LENGTH_LIMIT_EXPR (--n == 0) || c1 == '\0')
60*75f6d617Schristos break;
61*75f6d617Schristos
62*75f6d617Schristos ++p1;
63*75f6d617Schristos ++p2;
64*75f6d617Schristos }
65*75f6d617Schristos while (c1 == c2);
66*75f6d617Schristos
67*75f6d617Schristos return c1 - c2;
68*75f6d617Schristos }
69