1/*	$NetBSD: only.c,v 1.2 2013/02/05 00:59:03 christos Exp $	*/
2
3/*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of The NetBSD Foundation nor the names of its
19 *    contributors may be used to endorse or promote products derived
20 *    from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
25 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 */
34#if HAVE_NBTOOL_CONFIG_H
35#include "nbtool_config.h"
36#endif
37
38#include <sys/cdefs.h>
39
40#if defined(__RCSID) && !defined(lint)
41__RCSID("$NetBSD: only.c,v 1.2 2013/02/05 00:59:03 christos Exp $");
42#endif
43
44#include <sys/param.h>
45
46#include <stdio.h>
47#include <stdlib.h>
48#include <string.h>
49#include <stdbool.h>
50#include <time.h>
51#include <err.h>
52#include <util.h>
53
54#include "extern.h"
55
56struct hentry {
57	char *str;
58	uint32_t hash;
59	struct hentry *next;
60};
61
62static struct hentry *table[1024];
63static bool loaded;
64
65static uint32_t
66hash_str(const char *str)
67{
68	const uint8_t *s = (const uint8_t *)str;
69	uint8_t c;
70	uint32_t hash = 0;
71	while ((c = *s++) != '\0')
72		hash = hash * 33 + c;           /* "perl": k=33, r=r+r/32 */
73	return hash + (hash >> 5);
74}
75
76static bool
77hash_find(const char *str, uint32_t *h)
78{
79	struct hentry *e;
80	*h = hash_str(str) % __arraycount(table);
81
82	for (e = table[*h]; e; e = e->next)
83		if (e->hash == *h && strcmp(e->str, str) == 0)
84			return true;
85	return false;
86}
87
88static void
89hash_insert(char *str, uint32_t h)
90{
91	struct hentry *e;
92
93	if ((e = malloc(sizeof(*e))) == NULL)
94		mtree_err("memory allocation error");
95
96	e->str = str;
97	e->hash = h;
98	e->next = table[h];
99	table[h] = e;
100}
101
102static void
103fill(char *str)
104{
105	uint32_t h;
106	char *ptr = strrchr(str, '/');
107
108	if (ptr == NULL)
109		return;
110
111	*ptr = '\0';
112	if (!hash_find(str, &h)) {
113		char *x = strdup(str);
114		if (x == NULL)
115			mtree_err("memory allocation error");
116		hash_insert(x, h);
117		fill(str);
118	}
119	*ptr = '/';
120}
121
122void
123load_only(const char *fname)
124{
125	FILE *fp;
126	char *line;
127	size_t len, lineno;
128
129	if ((fp = fopen(fname, "r")) == NULL)
130		err(1, "Cannot open `%s'", fname);
131
132	while ((line = fparseln(fp, &len, &lineno, NULL, FPARSELN_UNESCALL))) {
133		uint32_t h;
134		if (hash_find(line, &h))
135			err(1, "Duplicate entry %s", line);
136		hash_insert(line, h);
137		fill(line);
138	}
139
140	fclose(fp);
141	loaded = true;
142}
143
144bool
145find_only(const char *path)
146{
147	uint32_t h;
148
149	if (!loaded)
150		return true;
151	return hash_find(path, &h);
152}
153