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 #if defined(LIBC_SCCS) && !defined(lint) 14 static char sccsid[] = "@(#)strcasecmp.c 5.5 (Berkeley) 11/24/87"; 15 #endif /* LIBC_SCCS and not lint */ 16 17 #include <sys/types.h> 18 19 /* 20 * This array is designed for mapping upper and lower case letter 21 * together for a case independent comparison. The mappings are 22 * based upon ascii character sequences. 23 */ 24 static u_char charmap[] = { 25 '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007', 26 '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017', 27 '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027', 28 '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037', 29 '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047', 30 '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057', 31 '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067', 32 '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077', 33 '\100', '\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', '\133', '\134', '\135', '\136', '\137', 37 '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147', 38 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157', 39 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167', 40 '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177', 41 '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207', 42 '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217', 43 '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227', 44 '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237', 45 '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247', 46 '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257', 47 '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267', 48 '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277', 49 '\300', '\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', '\333', '\334', '\335', '\336', '\337', 53 '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347', 54 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357', 55 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367', 56 '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377', 57 }; 58 59 strcasecmp(s1, s2) 60 char *s1, *s2; 61 { 62 register u_char *cm = charmap, 63 *us1 = (u_char *)s1, 64 *us2 = (u_char *)s2; 65 66 while (cm[*us1] == cm[*us2++]) 67 if (*us1++ == '\0') 68 return(0); 69 return(cm[*us1] - cm[*--us2]); 70 } 71 72 strncasecmp(s1, s2, n) 73 char *s1, *s2; 74 register int n; 75 { 76 register u_char *cm = charmap, 77 *us1 = (u_char *)s1, 78 *us2 = (u_char *)s2; 79 80 while (--n >= 0 && cm[*us1] == cm[*us2++]) 81 if (*us1++ == '\0') 82 return(0); 83 return(n < 0 ? 0 : cm[*us1] - cm[*--us2]); 84 } 85