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      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 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 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 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