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