bin/mandoc/dba_array.c

   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
  29 struct 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
  41 struct dba_array *
  42 dba_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
  59 void
  60 dba_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
  74 void
  75 dba_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
  88 void
  89 dba_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
 102 void *
 103 dba_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
 110 void
 111 dba_array_start(struct dba_array *array)
 112 {
 113         array->ec = array->eu;
 114 }
 115
 116 void *
 117 dba_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
 128 void
 129 dba_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
 137 void
 138 dba_array_undel(struct dba_array *array)
 139 {
 140         memset(array->em, 0, sizeof(*array->em) * array->eu);
 141 }
 142
 143 void
 144 dba_array_setpos(struct dba_array *array, int32_t ie, int32_t pos)
 145 {
 146         array->em[ie] = pos;
 147 }
 148
 149 int32_t
 150 dba_array_getpos(struct dba_array *array)
 151 {
 152         return array->pos;
 153 }
 154
 155 void
 156 dba_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
 162 int32_t
 163 dba_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
 169 void
 170 dba_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
 180 void
 181 dba_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 }