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 this notice is preserved and that due credit is given 7 * to the University of California at Berkeley. The name of the University 8 * may not be used to endorse or promote products derived from this 9 * software without specific written prior permission. This software 10 * is provided ``as is'' without express or implied warranty. 11 */ 12 13 #ifdef HAVE_CONFIG_H 14 #include "config.h" 15 #endif 16 17 #ifndef lint 18 static const char rcsid[] _U_ = 19 "@(#) $Header: /tcpdump/master/tcpdump/strcasecmp.c,v 1.6 2003-11-16 09:36:43 guy Exp $"; 20 #endif 21 22 #include <tcpdump-stdinc.h> 23 24 #include "interface.h" 25 26 /* 27 * This array is designed for mapping upper and lower case letter 28 * together for a case independent comparison. The mappings are 29 * based upon ascii character sequences. 30 */ 31 static const u_char charmap[] = { 32 '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007', 33 '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017', 34 '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027', 35 '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037', 36 '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047', 37 '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057', 38 '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067', 39 '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077', 40 '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147', 41 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157', 42 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167', 43 '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137', 44 '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147', 45 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157', 46 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167', 47 '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177', 48 '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207', 49 '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217', 50 '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227', 51 '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237', 52 '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247', 53 '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257', 54 '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267', 55 '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277', 56 '\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347', 57 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357', 58 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367', 59 '\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337', 60 '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347', 61 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357', 62 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367', 63 '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377', 64 }; 65 66 int 67 strcasecmp(s1, s2) 68 const char *s1, *s2; 69 { 70 register const u_char *cm = charmap, 71 *us1 = (u_char *)s1, 72 *us2 = (u_char *)s2; 73 74 while (cm[*us1] == cm[*us2++]) 75 if (*us1++ == '\0') 76 return(0); 77 return(cm[*us1] - cm[*--us2]); 78 } 79 80 int 81 strncasecmp(s1, s2, n) 82 const char *s1, *s2; 83 register int n; 84 { 85 register const u_char *cm = charmap, 86 *us1 = (u_char *)s1, 87 *us2 = (u_char *)s2; 88 89 while (--n >= 0 && cm[*us1] == cm[*us2++]) 90 if (*us1++ == '\0') 91 return(0); 92 return(n < 0 ? 0 : cm[*us1] - cm[*--us2]); 93 } 94
