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[binutils.git] / libiberty / strncasecmp.c
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1 /*
2 * Copyright (c) 1987 Regents of the University of California.
3 * All rights reserved.
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}.
19 @end deftypefn
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 */
27 #include <ansidecl.h>
28 #ifdef ANSI_PROTOTYPES
29 #include <stddef.h>
30 #else
31 #define size_t unsigned long
32 #endif
35 * This array is designed for mapping upper and lower case letter
36 * together for a case independent comparison. The mappings are
37 * based upon ascii character sequences.
39 static const unsigned char charmap[] = {
40 '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
41 '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
42 '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
43 '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
44 '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
45 '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
46 '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
47 '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
48 '\100', '\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', '\133', '\134', '\135', '\136', '\137',
52 '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
53 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
54 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
55 '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
56 '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
57 '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
58 '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
59 '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
60 '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
61 '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
62 '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
63 '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
64 '\300', '\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', '\333', '\334', '\335', '\336', '\337',
68 '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
69 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
70 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
71 '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
74 int
75 strncasecmp(s1, s2, n)
76 const char *s1, *s2;
77 register size_t n;
79 register unsigned char u1, u2;
81 for (; n != 0; --n) {
82 u1 = (unsigned char) *s1++;
83 u2 = (unsigned char) *s2++;
84 if (charmap[u1] != charmap[u2]) {
85 return charmap[u1] - charmap[u2];
87 if (u1 == '\0') {
88 return 0;
91 return 0;