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 MERCHANTIBILITY 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: }