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 5.4 (Berkeley) 11/23/87"; 9 #endif /* LIBC_SCCS and not lint */ 10 11 #include <sys/types.h> 12 13 /* 14 * This array is designed for mapping upper and lower case letter 15 * together for a case independent comparison. The mappings are 16 * based upon ascii character sequences. 17 */ 18 static u_char charmap[] = { 19 '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007', 20 '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017', 21 '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027', 22 '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037', 23 '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047', 24 '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057', 25 '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067', 26 '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077', 27 '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147', 28 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157', 29 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167', 30 '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137', 31 '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147', 32 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157', 33 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167', 34 '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177', 35 '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207', 36 '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217', 37 '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227', 38 '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237', 39 '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247', 40 '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257', 41 '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267', 42 '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277', 43 '\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347', 44 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357', 45 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367', 46 '\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337', 47 '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347', 48 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357', 49 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367', 50 '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377', 51 }; 52 53 strcasecmp(s1, s2) 54 char *s1, *s2; 55 { 56 register u_char *cm = charmap, 57 *us1 = (u_char *)s1, 58 *us2 = (u_char *)s2; 59 60 while (cm[*us1] == cm[*us2++]) 61 if (*us1++ == '\0') 62 return(0); 63 return(cm[*us1] - cm[*--us2]); 64 } 65 66 strncasecmp(s1, s2, n) 67 char *s1, *s2; 68 register int n; 69 { 70 register u_char *cm = charmap, 71 *us1 = (u_char *)s1, 72 *us2 = (u_char *)s2; 73 74 while (--n >= 0 && cm[*us1] == cm[*us2++]) 75 if (*us1++ == '\0') 76 return(0); 77 return(n < 0 ? 0 : cm[*us1] - cm[*--us2]); 78 } 79