Merge branch 'vendor/FILE'
[dragonfly.git] / contrib / tcp_wrappers / strcasecmp.c
CommitLineData
984263bc
MD
1/*
2 * Copyright (c) 1987 Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms are permitted
6 * provided that the above copyright notice and this paragraph are
7 * duplicated in all such forms and that any documentation,
8 * advertising materials, and other materials related to such
9 * distribution and use acknowledge that the software was developed
10 * by the University of California, Berkeley. The name of the
11 * University may not be used to endorse or promote products derived
12 * from this software without specific prior written permission.
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16 */
17
18#if defined(LIBC_SCCS) && !defined(lint)
19static char sccsid[] = "@(#)strcasecmp.c 5.6 (Berkeley) 6/27/88";
20#endif /* LIBC_SCCS and not lint */
21
22/* Some environments don't define u_char -- WZV */
23#if 0
24#include <sys/types.h>
25#else
26typedef unsigned char u_char;
27#endif
28
29/*
30 * This array is designed for mapping upper and lower case letter
31 * together for a case independent comparison. The mappings are
32 * based upon ascii character sequences.
33 */
34static u_char charmap[] = {
35 '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
36 '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
37 '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
38 '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
39 '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
40 '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
41 '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
42 '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
43 '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
44 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
45 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
46 '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
47 '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
48 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
49 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
50 '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
51 '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
52 '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
53 '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
54 '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
55 '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
56 '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
57 '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
58 '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
59 '\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
60 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
61 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
62 '\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337',
63 '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
64 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
65 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
66 '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
67};
68
69strcasecmp(s1, s2)
70 char *s1, *s2;
71{
72 register u_char *cm = charmap,
73 *us1 = (u_char *)s1,
74 *us2 = (u_char *)s2;
75
76 while (cm[*us1] == cm[*us2++])
77 if (*us1++ == '\0')
78 return(0);
79 return(cm[*us1] - cm[*--us2]);
80}
81
82strncasecmp(s1, s2, n)
83 char *s1, *s2;
84 register int n;
85{
86 register u_char *cm = charmap,
87 *us1 = (u_char *)s1,
88 *us2 = (u_char *)s2;
89
90 while (--n >= 0 && cm[*us1] == cm[*us2++])
91 if (*us1++ == '\0')
92 return(0);
93 return(n < 0 ? 0 : cm[*us1] - cm[*--us2]);
94}