Mercurial > hg > CbC > CbC_gcc
comparison libiberty/strncasecmp.c @ 0:a06113de4d67
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author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
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-1:000000000000 | 0:a06113de4d67 |
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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 /* | |
14 | |
15 @deftypefn Supplemental int strncasecmp (const char *@var{s1}, const char *@var{s2}) | |
16 | |
17 A case-insensitive @code{strncmp}. | |
18 | |
19 @end deftypefn | |
20 | |
21 */ | |
22 | |
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 */ | |
26 | |
27 #include <ansidecl.h> | |
28 #include <stddef.h> | |
29 | |
30 /* | |
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. | |
34 */ | |
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', | |
68 }; | |
69 | |
70 int | |
71 strncasecmp(const char *s1, const char *s2, register size_t n) | |
72 { | |
73 register unsigned char u1, u2; | |
74 | |
75 for (; n != 0; --n) { | |
76 u1 = (unsigned char) *s1++; | |
77 u2 = (unsigned char) *s2++; | |
78 if (charmap[u1] != charmap[u2]) { | |
79 return charmap[u1] - charmap[u2]; | |
80 } | |
81 if (u1 == '\0') { | |
82 return 0; | |
83 } | |
84 } | |
85 return 0; | |
86 } |