1/*	$NetBSD: subr.c,v 1.1.1.1 2009/04/12 15:33:59 christos Exp $	*/
2
3/*
4 * Copyright (C) 2009  Internet Systems Consortium, Inc. ("ISC")
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
11 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
12 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
13 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
14 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
15 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
16 * PERFORMANCE OF THIS SOFTWARE.
17 */
18
19/*
20 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
21 *
22 * Permission to use, copy, modify, and distribute this software for any
23 * purpose with or without fee is hereby granted, provided that the above
24 * copyright notice and this permission notice appear in all copies, and that
25 * the name of Digital Equipment Corporation not be used in advertising or
26 * publicity pertaining to distribution of the document or software without
27 * specific, written prior permission.
28 *
29 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
30 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
31 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
32 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
33 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
34 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
35 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
36 * SOFTWARE.
37 */
38
39#ifndef lint
40static const char sccsid[] = "@(#)subr.c	5.24 (Berkeley) 3/2/91";
41static const char rcsid[] = "Id: subr.c,v 1.3 2009/03/03 23:49:07 tbox Exp";
42#endif /* not lint */
43
44/*
45 *******************************************************************************
46 *
47 *  subr.c --
48 *
49 *	Miscellaneous subroutines for the name server
50 *	lookup program.
51 *
52 *	Copyright (c) 1985
53 *	Andrew Cherenson
54 *	U.C. Berkeley
55 *	CS298-26  Fall 1985
56 *
57 *******************************************************************************
58 */
59
60#include "port_before.h"
61
62#include <sys/types.h>
63#include <sys/param.h>
64#include <sys/socket.h>
65
66#include <netinet/in.h>
67#include <arpa/nameser.h>
68#include <arpa/inet.h>
69
70#include <ctype.h>
71#include <netdb.h>
72#include <setjmp.h>
73#include <signal.h>
74#include <stdio.h>
75#include <stdlib.h>
76#include <string.h>
77
78#include "port_after.h"
79
80#include "resolv.h"
81#include "res.h"
82
83
84/*
85 *******************************************************************************
86 *
87 *  StringToClass --
88 *
89 *	Converts a string form of a query class name to its
90 *	corresponding integer value.
91 *
92 *******************************************************************************
93 */
94int
95StringToClass(class, dflt, errorfile)
96    char *class;
97    int dflt;
98    FILE *errorfile;
99{
100	int result, success;
101
102	result = sym_ston(__p_class_syms, class, &success);
103	if (success)
104		return result;
105
106	if (errorfile)
107		fprintf(errorfile, "unknown query class: %s\n", class);
108	return(dflt);
109}
110
111
112/*
113 *******************************************************************************
114 *
115 *  StringToType --
116 *
117 *	Converts a string form of a query type name to its
118 *	corresponding integer value.
119 *
120 *******************************************************************************
121 */
122
123int
124StringToType(type, dflt, errorfile)
125    char *type;
126    int dflt;
127    FILE *errorfile;
128{
129	int result, success;
130
131	result = sym_ston(__p_type_syms, type, &success);
132	if (success)
133		return (result);
134
135	if (errorfile)
136		fprintf(errorfile, "unknown query type: %s\n", type);
137	return (dflt);
138}
139
140/*
141 * Skip over leading white space in SRC and then copy the next sequence of
142 * non-whitespace characters into DEST. No more than (DEST_SIZE - 1)
143 * characters are copied. DEST is always null-terminated. Returns 0 if no
144 * characters could be copied into DEST. Returns the number of characters
145 * in SRC that were processed (i.e. the count of characters in the leading
146 * white space and the first non-whitespace sequence).
147 *
148 * 	int i;
149 * 	char *p = "  foo bar ", *q;
150 * 	char buf[100];
151 *
152 * 	q = p + pickString(p, buf, sizeof buff);
153 * 	assert (strcmp (q, " bar ") == 0) ;
154 *
155 */
156
157int
158pickString(const char *src, char *dest, size_t dest_size) {
159	const char *start;
160	const char *end ;
161	size_t sublen ;
162
163	if (dest_size == 0 || dest == NULL || src == NULL)
164		return 0;
165
166	for (start = src ; isspace((unsigned char)*start) ; start++)
167		/* nada */ ;
168
169        for (end = start ; *end != '\0' && !isspace((unsigned char)*end) ; end++)
170		/* nada */ ;
171
172	sublen = end - start ;
173
174	if (sublen == 0 || sublen > (dest_size - 1))
175		return 0;
176
177	strncpy (dest, start, sublen);
178
179	dest[sublen] = '\0' ;
180
181	return (end - src);
182}
183
184
185
186
187/*
188 * match the string FORMAT against the string SRC. Leading whitespace in
189 * FORMAT will match any amount of (including no) leading whitespace in
190 * SRC. Any amount of whitespace inside FORMAT matches any non-zero amount
191 * of whitespace in SRC. Value returned is 0 if match didn't occur, or the
192 * amount of characters in SRC that did match
193 *
194 * 	int i ;
195 *
196 * 	i = matchString(" a    b c", "a b c") ;
197 * 	assert (i == 5) ;
198 * 	i = matchString("a b c", "  a b c");
199 * 	assert (i == 0) ;    becasue no leading white space in format
200 * 	i = matchString(" a b c", " a   b     c");
201 * 	assert(i == 12);
202 * 	i = matchString("aa bb ", "aa      bb      ddd sd");
203 * 	assert(i == 16);
204 */
205int
206matchString (const char *format, const char *src) {
207	const char *f = format;
208	const char *s = src;
209
210	if (f == NULL || s == NULL)
211		goto notfound;
212
213	if (isspace((unsigned char)*f)) {
214		while (isspace((unsigned char)*f))
215			f++ ;
216		while (isspace((unsigned char)*s))
217			s++ ;
218	}
219
220	while (1) {
221		if (isspace((unsigned char)*f)) {
222			if (!isspace((unsigned char)*s))
223				goto notfound;
224			while(isspace((unsigned char)*s))
225				s++;
226			/* any amount of whitespace in the format string
227			   will match any amount of space in the source
228			   string. */
229			while (isspace((unsigned char)*f))
230				f++;
231		} else if (*f == '\0') {
232			return (s - src);
233		} else if (*f != *s) {
234			goto notfound;
235		} else {
236			s++ ;
237			f++ ;
238		}
239	}
240 notfound:
241	return 0 ;
242}
243