2 * Copyright (c) 1987 Regents of the University of California.
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.
15 @deftypefn Supplemental int strncasecmp (const char *@var{s1}, const char *@var{s2})
17 A case-insensitive @code{strncmp}.
23 #if defined(LIBC_SCCS) && !defined(lint)
24 static char sccsid
[] = "@(#)strcasecmp.c 5.5 (Berkeley) 11/24/87";
25 #endif /* LIBC_SCCS and not lint */
31 * This array is designed for mapping upper and lower case letter
32 * together for a case independent comparison. The mappings are
33 * based upon ascii character sequences.
35 static const unsigned char charmap
[] = {
36 '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
37 '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
38 '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
39 '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
40 '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
41 '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
42 '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
43 '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
44 '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
45 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
46 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
47 '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
48 '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
49 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
50 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
51 '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
52 '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
53 '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
54 '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
55 '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
56 '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
57 '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
58 '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
59 '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
60 '\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
61 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
62 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
63 '\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337',
64 '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
65 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
66 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
67 '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
71 strncasecmp(const char *s1
, const char *s2
, register size_t n
)
73 register unsigned char u1
, u2
;
76 u1
= (unsigned char) *s1
++;
77 u2
= (unsigned char) *s2
++;
78 if (charmap
[u1
] != charmap
[u2
]) {
79 return charmap
[u1
] - charmap
[u2
];
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