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#include <sys/cdefs.h> 18#ifndef lint 19#if 0 20static const char rcsid[] _U_ = 21 "@(#) Header: /tcpdump/master/tcpdump/strcasecmp.c,v 1.6 2003-11-16 09:36:43 guy Exp"; 22#else 23__RCSID("$NetBSD$"); 24#endif 25#endif 26 27#include <tcpdump-stdinc.h> 28 29#include "interface.h" 30 31/* 32 * This array is designed for mapping upper and lower case letter 33 * together for a case independent comparison. The mappings are 34 * based upon ascii character sequences. 35 */ 36static const u_char charmap[] = { 37 '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007', 38 '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017', 39 '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027', 40 '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037', 41 '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047', 42 '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057', 43 '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067', 44 '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077', 45 '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147', 46 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157', 47 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167', 48 '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137', 49 '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147', 50 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157', 51 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167', 52 '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177', 53 '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207', 54 '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217', 55 '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227', 56 '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237', 57 '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247', 58 '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257', 59 '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267', 60 '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277', 61 '\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347', 62 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357', 63 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367', 64 '\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337', 65 '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347', 66 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357', 67 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367', 68 '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377', 69}; 70 71int 72strcasecmp(s1, s2) 73 const char *s1, *s2; 74{ 75 register const u_char *cm = charmap, 76 *us1 = (u_char *)s1, 77 *us2 = (u_char *)s2; 78 79 while (cm[*us1] == cm[*us2++]) 80 if (*us1++ == '\0') 81 return(0); 82 return(cm[*us1] - cm[*--us2]); 83} 84 85int 86strncasecmp(s1, s2, n) 87 const char *s1, *s2; 88 register int n; 89{ 90 register const u_char *cm = charmap, 91 *us1 = (u_char *)s1, 92 *us2 = (u_char *)s2; 93 94 while (--n >= 0 && cm[*us1] == cm[*us2++]) 95 if (*us1++ == '\0') 96 return(0); 97 return(n < 0 ? 0 : cm[*us1] - cm[*--us2]); 98} 99