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: strcasecmp.c,v 1.2 2010/12/05 05:11:31 christos Exp $");
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