| 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 the above copyright notice and this paragraph are |
| 7 | * duplicated in all such forms and that any documentation, |
| 8 | * advertising materials, and other materials related to such |
| 9 | * distribution and use acknowledge that the software was developed |
| 10 | * by the University of California, Berkeley. The name of the |
| 11 | * University may not be used to endorse or promote products derived |
| 12 | * from this software without specific prior written permission. |
| 13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
| 14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
| 15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 16 | */ |
| 17 | |
| 18 | #if defined(LIBC_SCCS) && !defined(lint) |
| 19 | static char sccsid[] = "@(#)strcasecmp.c 5.6 (Berkeley) 6/27/88"; |
| 20 | #endif /* LIBC_SCCS and not lint */ |
| 21 | |
| 22 | /* Some environments don't define u_char -- WZV */ |
| 23 | #if 0 |
| 24 | #include <sys/types.h> |
| 25 | #else |
| 26 | typedef unsigned char u_char; |
| 27 | #endif |
| 28 | |
| 29 | /* |
| 30 | * This array is designed for mapping upper and lower case letter |
| 31 | * together for a case independent comparison. The mappings are |
| 32 | * based upon ascii character sequences. |
| 33 | */ |
| 34 | static u_char charmap[] = { |
| 35 | '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007', |
| 36 | '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017', |
| 37 | '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027', |
| 38 | '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037', |
| 39 | '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047', |
| 40 | '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057', |
| 41 | '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067', |
| 42 | '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077', |
| 43 | '\100', '\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', '\133', '\134', '\135', '\136', '\137', |
| 47 | '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147', |
| 48 | '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157', |
| 49 | '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167', |
| 50 | '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177', |
| 51 | '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207', |
| 52 | '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217', |
| 53 | '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227', |
| 54 | '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237', |
| 55 | '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247', |
| 56 | '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257', |
| 57 | '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267', |
| 58 | '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277', |
| 59 | '\300', '\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', '\333', '\334', '\335', '\336', '\337', |
| 63 | '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347', |
| 64 | '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357', |
| 65 | '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367', |
| 66 | '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377', |
| 67 | }; |
| 68 | |
| 69 | strcasecmp(s1, s2) |
| 70 | char *s1, *s2; |
| 71 | { |
| 72 | register u_char *cm = charmap, |
| 73 | *us1 = (u_char *)s1, |
| 74 | *us2 = (u_char *)s2; |
| 75 | |
| 76 | while (cm[*us1] == cm[*us2++]) |
| 77 | if (*us1++ == '\0') |
| 78 | return(0); |
| 79 | return(cm[*us1] - cm[*--us2]); |
| 80 | } |
| 81 | |
| 82 | strncasecmp(s1, s2, n) |
| 83 | char *s1, *s2; |
| 84 | register int n; |
| 85 | { |
| 86 | register u_char *cm = charmap, |
| 87 | *us1 = (u_char *)s1, |
| 88 | *us2 = (u_char *)s2; |
| 89 | |
| 90 | while (--n >= 0 && cm[*us1] == cm[*us2++]) |
| 91 | if (*us1++ == '\0') |
| 92 | return(0); |
| 93 | return(n < 0 ? 0 : cm[*us1] - cm[*--us2]); |
| 94 | } |