1/*	Id: dba_array.c,v 1.1 2016/07/19 21:31:55 schwarze Exp  */
2/*
3 * Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 *
17 * Allocation-based arrays for the mandoc database, for read-write access.
18 * The interface is defined in "dba_array.h".
19 */
20#include <assert.h>
21#include <stdint.h>
22#include <stdlib.h>
23#include <string.h>
24
25#include "mandoc_aux.h"
26#include "dba_write.h"
27#include "dba_array.h"
28
29struct dba_array {
30	void	**ep;	/* Array of entries. */
31	int32_t	 *em;	/* Array of map positions. */
32	int	  flags;
33	int32_t	  ea;	/* Entries allocated. */
34	int32_t	  eu;	/* Entries used (including deleted). */
35	int32_t	  ed;	/* Entries deleted. */
36	int32_t	  ec;	/* Currently active entry. */
37	int32_t	  pos;  /* Map position of this array. */
38};
39
40
41struct dba_array *
42dba_array_new(int32_t ea, int flags)
43{
44	struct dba_array	*array;
45
46	assert(ea > 0);
47	array = mandoc_malloc(sizeof(*array));
48	array->ep = mandoc_reallocarray(NULL, ea, sizeof(*array->ep));
49	array->em = mandoc_reallocarray(NULL, ea, sizeof(*array->em));
50	array->ea = ea;
51	array->eu = 0;
52	array->ed = 0;
53	array->ec = 0;
54	array->flags = flags;
55	array->pos = 0;
56	return array;
57}
58
59void
60dba_array_free(struct dba_array *array)
61{
62	int32_t	 ie;
63
64	if (array == NULL)
65		return;
66	if (array->flags & DBA_STR)
67		for (ie = 0; ie < array->eu; ie++)
68			free(array->ep[ie]);
69	free(array->ep);
70	free(array->em);
71	free(array);
72}
73
74void
75dba_array_set(struct dba_array *array, int32_t ie, void *entry)
76{
77	assert(ie >= 0);
78	assert(ie < array->ea);
79	assert(ie <= array->eu);
80	if (ie == array->eu)
81		array->eu++;
82	if (array->flags & DBA_STR)
83		entry = mandoc_strdup(entry);
84	array->ep[ie] = entry;
85	array->em[ie] = 0;
86}
87
88void
89dba_array_add(struct dba_array *array, void *entry)
90{
91	if (array->eu == array->ea) {
92		assert(array->flags & DBA_GROW);
93		array->ep = mandoc_reallocarray(array->ep,
94		    2, sizeof(*array->ep) * array->ea);
95		array->em = mandoc_reallocarray(array->em,
96		    2, sizeof(*array->em) * array->ea);
97		array->ea *= 2;
98	}
99	dba_array_set(array, array->eu, entry);
100}
101
102void *
103dba_array_get(struct dba_array *array, int32_t ie)
104{
105	if (ie < 0 || ie >= array->eu || array->em[ie] == -1)
106		return NULL;
107	return array->ep[ie];
108}
109
110void
111dba_array_start(struct dba_array *array)
112{
113	array->ec = array->eu;
114}
115
116void *
117dba_array_next(struct dba_array *array)
118{
119	if (array->ec < array->eu)
120		array->ec++;
121	else
122		array->ec = 0;
123	while (array->ec < array->eu && array->em[array->ec] == -1)
124		array->ec++;
125	return array->ec < array->eu ? array->ep[array->ec] : NULL;
126}
127
128void
129dba_array_del(struct dba_array *array)
130{
131	if (array->ec < array->eu && array->em[array->ec] != -1) {
132		array->em[array->ec] = -1;
133		array->ed++;
134	}
135}
136
137void
138dba_array_undel(struct dba_array *array)
139{
140	memset(array->em, 0, sizeof(*array->em) * array->eu);
141}
142
143void
144dba_array_setpos(struct dba_array *array, int32_t ie, int32_t pos)
145{
146	array->em[ie] = pos;
147}
148
149int32_t
150dba_array_getpos(struct dba_array *array)
151{
152	return array->pos;
153}
154
155void
156dba_array_sort(struct dba_array *array, dba_compare_func func)
157{
158	assert(array->ed == 0);
159	qsort(array->ep, array->eu, sizeof(*array->ep), func);
160}
161
162int32_t
163dba_array_writelen(struct dba_array *array, int32_t nmemb)
164{
165	dba_int_write(array->eu - array->ed);
166	return dba_skip(nmemb, array->eu - array->ed);
167}
168
169void
170dba_array_writepos(struct dba_array *array)
171{
172	int32_t	 ie;
173
174	array->pos = dba_tell();
175	for (ie = 0; ie < array->eu; ie++)
176		if (array->em[ie] != -1)
177			dba_int_write(array->em[ie]);
178}
179
180void
181dba_array_writelst(struct dba_array *array)
182{
183	const char	*str;
184
185	dba_array_FOREACH(array, str)
186		dba_str_write(str);
187	dba_char_write('\0');
188}
189