1 /* 2 * Copyright (c) 1987 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 */ 6 7 #if defined(LIBC_SCCS) && !defined(lint) 8 static char sccsid[] = "@(#)strcasecmp.c 5.2 (Berkeley) 07/02/87"; 9 #endif LIBC_SCCS and not lint 10 11 /* 12 * This array is designed for mapping upper and lower case letter 13 * together for a case independent comparison. The mappings are 14 * based upon ascii character sequences. 15 */ 16 static char charmap[] = { 17 '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007', 18 '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017', 19 '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027', 20 '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037', 21 '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047', 22 '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057', 23 '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067', 24 '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077', 25 '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147', 26 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157', 27 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167', 28 '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137', 29 '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147', 30 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157', 31 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167', 32 '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177', 33 '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207', 34 '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217', 35 '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227', 36 '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237', 37 '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247', 38 '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257', 39 '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267', 40 '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277', 41 '\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347', 42 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357', 43 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367', 44 '\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337', 45 '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347', 46 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357', 47 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367', 48 '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377', 49 }; 50 51 strcasecmp(s1, s2) 52 register char *s1, *s2; 53 { 54 register char *cm = charmap; 55 56 while (cm[*s1] == cm[*s2++]) 57 if (*s1++ == '\0') 58 return(0); 59 return(cm[*s1] - cm[*--s2]); 60 } 61 62 strcasencmp(s1, s2, n) 63 register char *s1, *s2; 64 register int n; 65 { 66 register char *cm = charmap; 67 68 while (--n >= 0 && cm[*s1] == cm[*s2++]) 69 if (*s1++ == '\0') 70 return(0); 71 return(n < 0 ? 0 : cm[*s1] - cm[*--s2]); 72 } 73