1 /* $Id: dba_array.c,v 1.2 2020/06/22 19:20:40 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 "config.h"
21
22 #include <assert.h>
23 #include <stdint.h>
24 #include <stdlib.h>
25 #include <string.h>
26
27 #include "mandoc_aux.h"
28 #include "dba_write.h"
29 #include "dba_array.h"
30
31 struct dba_array {
32 void **ep; /* Array of entries. */
33 int32_t *em; /* Array of map positions. */
34 int flags;
35 int32_t ea; /* Entries allocated. */
36 int32_t eu; /* Entries used (including deleted). */
37 int32_t ed; /* Entries deleted. */
38 int32_t ec; /* Currently active entry. */
39 int32_t pos; /* Map position of this array. */
40 };
41
42
43 struct dba_array *
dba_array_new(int32_t ea,int flags)44 dba_array_new(int32_t ea, int flags)
45 {
46 struct dba_array *array;
47
48 assert(ea > 0);
49 array = mandoc_malloc(sizeof(*array));
50 array->ep = mandoc_reallocarray(NULL, ea, sizeof(*array->ep));
51 array->em = mandoc_reallocarray(NULL, ea, sizeof(*array->em));
52 array->ea = ea;
53 array->eu = 0;
54 array->ed = 0;
55 array->ec = 0;
56 array->flags = flags;
57 array->pos = 0;
58 return array;
59 }
60
61 void
dba_array_free(struct dba_array * array)62 dba_array_free(struct dba_array *array)
63 {
64 int32_t ie;
65
66 if (array == NULL)
67 return;
68 if (array->flags & DBA_STR)
69 for (ie = 0; ie < array->eu; ie++)
70 free(array->ep[ie]);
71 free(array->ep);
72 free(array->em);
73 free(array);
74 }
75
76 void
dba_array_set(struct dba_array * array,int32_t ie,void * entry)77 dba_array_set(struct dba_array *array, int32_t ie, void *entry)
78 {
79 assert(ie >= 0);
80 assert(ie < array->ea);
81 assert(ie <= array->eu);
82 if (ie == array->eu)
83 array->eu++;
84 if (array->flags & DBA_STR)
85 entry = mandoc_strdup(entry);
86 array->ep[ie] = entry;
87 array->em[ie] = 0;
88 }
89
90 void
dba_array_add(struct dba_array * array,void * entry)91 dba_array_add(struct dba_array *array, void *entry)
92 {
93 if (array->eu == array->ea) {
94 assert(array->flags & DBA_GROW);
95 array->ep = mandoc_reallocarray(array->ep,
96 2, sizeof(*array->ep) * array->ea);
97 array->em = mandoc_reallocarray(array->em,
98 2, sizeof(*array->em) * array->ea);
99 array->ea *= 2;
100 }
101 dba_array_set(array, array->eu, entry);
102 }
103
104 void *
dba_array_get(struct dba_array * array,int32_t ie)105 dba_array_get(struct dba_array *array, int32_t ie)
106 {
107 if (ie < 0 || ie >= array->eu || array->em[ie] == -1)
108 return NULL;
109 return array->ep[ie];
110 }
111
112 void
dba_array_start(struct dba_array * array)113 dba_array_start(struct dba_array *array)
114 {
115 array->ec = array->eu;
116 }
117
118 void *
dba_array_next(struct dba_array * array)119 dba_array_next(struct dba_array *array)
120 {
121 if (array->ec < array->eu)
122 array->ec++;
123 else
124 array->ec = 0;
125 while (array->ec < array->eu && array->em[array->ec] == -1)
126 array->ec++;
127 return array->ec < array->eu ? array->ep[array->ec] : NULL;
128 }
129
130 void
dba_array_del(struct dba_array * array)131 dba_array_del(struct dba_array *array)
132 {
133 if (array->ec < array->eu && array->em[array->ec] != -1) {
134 array->em[array->ec] = -1;
135 array->ed++;
136 }
137 }
138
139 void
dba_array_undel(struct dba_array * array)140 dba_array_undel(struct dba_array *array)
141 {
142 memset(array->em, 0, sizeof(*array->em) * array->eu);
143 }
144
145 void
dba_array_setpos(struct dba_array * array,int32_t ie,int32_t pos)146 dba_array_setpos(struct dba_array *array, int32_t ie, int32_t pos)
147 {
148 array->em[ie] = pos;
149 }
150
151 int32_t
dba_array_getpos(struct dba_array * array)152 dba_array_getpos(struct dba_array *array)
153 {
154 return array->pos;
155 }
156
157 void
dba_array_sort(struct dba_array * array,dba_compare_func func)158 dba_array_sort(struct dba_array *array, dba_compare_func func)
159 {
160 assert(array->ed == 0);
161 qsort(array->ep, array->eu, sizeof(*array->ep), func);
162 }
163
164 int32_t
dba_array_writelen(struct dba_array * array,int32_t nmemb)165 dba_array_writelen(struct dba_array *array, int32_t nmemb)
166 {
167 dba_int_write(array->eu - array->ed);
168 return dba_skip(nmemb, array->eu - array->ed);
169 }
170
171 void
dba_array_writepos(struct dba_array * array)172 dba_array_writepos(struct dba_array *array)
173 {
174 int32_t ie;
175
176 array->pos = dba_tell();
177 for (ie = 0; ie < array->eu; ie++)
178 if (array->em[ie] != -1)
179 dba_int_write(array->em[ie]);
180 }
181
182 void
dba_array_writelst(struct dba_array * array)183 dba_array_writelst(struct dba_array *array)
184 {
185 const char *str;
186
187 dba_array_FOREACH(array, str)
188 dba_str_write(str);
189 dba_char_write('\0');
190 }
191