1 /* 2 * Copyright (c) 1987 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #include <sys/stdc.h> 9 #include <string.h> 10 11 #if defined(LIBC_SCCS) && !defined(lint) 12 static const char sccsid[] = "@(#)strcasecmp.c 5.9 (Berkeley) 06/01/90"; 13 #endif /* LIBC_SCCS and not lint */ 14 15 typedef unsigned char u_char; 16 17 /* 18 * This array is designed for mapping upper and lower case letter 19 * together for a case independent comparison. The mappings are 20 * based upon ascii character sequences. 21 */ 22 static const u_char charmap[] = { 23 '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007', 24 '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017', 25 '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027', 26 '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037', 27 '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047', 28 '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057', 29 '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067', 30 '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077', 31 '\100', '\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', '\133', '\134', '\135', '\136', '\137', 35 '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147', 36 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157', 37 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167', 38 '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177', 39 '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207', 40 '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217', 41 '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227', 42 '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237', 43 '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247', 44 '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257', 45 '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267', 46 '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277', 47 '\300', '\301', '\302', '\303', '\304', '\305', '\306', '\307', 48 '\310', '\311', '\312', '\313', '\314', '\315', '\316', '\317', 49 '\320', '\321', '\322', '\323', '\324', '\325', '\326', '\327', 50 '\330', '\331', '\332', '\333', '\334', '\335', '\336', '\337', 51 '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347', 52 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357', 53 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367', 54 '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377', 55 }; 56 57 int 58 strcasecmp(s1, s2) 59 const char *s1, *s2; 60 { 61 register const u_char *cm = charmap, 62 *us1 = (const u_char *)s1, 63 *us2 = (const u_char *)s2; 64 65 while (cm[*us1] == cm[*us2++]) 66 if (*us1++ == '\0') 67 return (0); 68 return (cm[*us1] - cm[*--us2]); 69 } 70 71 int 72 strncasecmp(s1, s2, n) 73 const char *s1, *s2; 74 register size_t n; 75 { 76 if (n != 0) { 77 register const u_char *cm = charmap, 78 *us1 = (const u_char *)s1, 79 *us2 = (const u_char *)s2; 80 81 do { 82 if (cm[*us1] != cm[*us2++]) 83 return (cm[*us1] - cm[*--us2]); 84 if (*us1++ == '\0') 85 break; 86 } while (--n != 0); 87 } 88 return (0); 89 } 90