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 MERCHANTABILITY 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 } 95