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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 typedef unsigned char u_char;
14
15 /*
16 * This array is designed for mapping upper and lower case letter
17 * together for a case independent comparison. The mappings are
18 * based upon ascii character sequences.
19 */
20 static const u_char charmap[] = {
21 '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
22 '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
23 '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
24 '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
25 '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
26 '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
27 '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
28 '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
29 '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
30 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
31 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
32 '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
33 '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
34 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
35 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
36 '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
37 '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
38 '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
39 '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
40 '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
41 '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
42 '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
43 '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
44 '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
45 '\300', '\301', '\302', '\303', '\304', '\305', '\306', '\307',
46 '\310', '\311', '\312', '\313', '\314', '\315', '\316', '\317',
47 '\320', '\321', '\322', '\323', '\324', '\325', '\326', '\327',
48 '\330', '\331', '\332', '\333', '\334', '\335', '\336', '\337',
49 '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
50 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
51 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
52 '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
53 };
54
55 int
56 strcasecmp(s1, s2)
57 const char *s1, *s2;
58 {
59 register const u_char *cm = charmap,
60 *us1 = (const u_char *)s1,
61 *us2 = (const u_char *)s2;
62
63 while (cm[*us1] == cm[*us2++])
64 if (*us1++ == '\0')
65 return (0);
66 return (cm[*us1] - cm[*--us2]);
67 }
68
69 int
70 strncasecmp(s1, s2, n)
71 const char *s1, *s2;
72 register n;
73 {
74 if (n != 0) {
75 register const u_char *cm = charmap,
76 *us1 = (const u_char *)s1,
77 *us2 = (const u_char *)s2;
78
79 do {
80 if (cm[*us1] != cm[*us2++])
81 return (cm[*us1] - cm[*--us2]);
82 if (*us1++ == '\0')
83 break;
84 } while (--n != 0);
85 }
86 return (0);
87 }