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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 this notice is preserved and that due credit is given
7 * to the University of California at Berkeley. The name of the University
8 * may not be used to endorse or promote products derived from this
9 * software without specific written prior permission. This software
10 * is provided ``as is'' without express or implied warranty.
11 */
12
13 #if defined(LIBC_SCCS) && !defined(lint)
14 static const char sccsid[] = "@(#)strcasecmp.c 5.5 (Berkeley) 11/24/87";
15 #endif /* LIBC_SCCS and not lint */
16
17 #ifdef HAVE_CONFIG_H
18 #include "config.h"
19 #endif
20
21 #include <sys/types.h>
22
23 #include "interface.h"
24
25 /*
26 * This array is designed for mapping upper and lower case letter
27 * together for a case independent comparison. The mappings are
28 * based upon ascii character sequences.
29 */
30 static u_char charmap[] = {
31 '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
32 '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
33 '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
34 '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
35 '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
36 '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
37 '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
38 '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
39 '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
40 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
41 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
42 '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
43 '\140', '\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', '\173', '\174', '\175', '\176', '\177',
47 '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
48 '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
49 '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
50 '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
51 '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
52 '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
53 '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
54 '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
55 '\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
56 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
57 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
58 '\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337',
59 '\340', '\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', '\373', '\374', '\375', '\376', '\377',
63 };
64
65 int
66 strcasecmp(s1, s2)
67 const char *s1, *s2;
68 {
69 register u_char *cm = charmap,
70 *us1 = (u_char *)s1,
71 *us2 = (u_char *)s2;
72
73 while (cm[*us1] == cm[*us2++])
74 if (*us1++ == '\0')
75 return(0);
76 return(cm[*us1] - cm[*--us2]);
77 }
78
79 int
80 strncasecmp(s1, s2, n)
81 const char *s1, *s2;
82 register int n;
83 {
84 register u_char *cm = charmap,
85 *us1 = (u_char *)s1,
86 *us2 = (u_char *)s2;
87
88 while (--n >= 0 && cm[*us1] == cm[*us2++])
89 if (*us1++ == '\0')
90 return(0);
91 return(n < 0 ? 0 : cm[*us1] - cm[*--us2]);
92 }