GRASS GIS 8 Programmer's Manual  8.5.0dev(2024)-fd508b23e3
vector/diglib/list.c
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1 /*****************************************************************************
2  *
3  * MODULE: Vector library
4  *
5  * AUTHOR(S): Original author CERL, probably Dave Gerdes.
6  * Update to GRASS 5.7 Radim Blazek.
7  *
8  * PURPOSE: Lower level functions for reading/writing/manipulating vectors.
9  *
10  * COPYRIGHT: (C) 2001 by the GRASS Development Team
11  *
12  * This program is free software under the GNU General Public
13  * License (>=v2). Read the file COPYING that comes with GRASS
14  * for details.
15  *
16  *****************************************************************************/
17 
18 #include <stdlib.h>
19 #include <grass/vector.h>
20 
21 /* Init box list */
22 int dig_init_boxlist(struct boxlist *list, int have_boxes)
23 {
24  list->id = NULL;
25  list->box = NULL;
26  list->have_boxes = have_boxes != 0;
27  list->n_values = 0;
28  list->alloc_values = 0;
29 
30  return 1;
31 }
32 
33 /* Add item to box list, does not check for duplicates */
34 int dig_boxlist_add(struct boxlist *list, int id, const struct bound_box *box)
35 {
36  if (list->n_values == list->alloc_values) {
37  size_t size = (list->n_values + 1000) * sizeof(int);
38  void *p = G_realloc((void *)list->id, size);
39 
40  if (p == NULL)
41  return 0;
42  list->id = (int *)p;
43 
44  if (list->have_boxes) {
45  size = (list->n_values + 1000) * sizeof(struct bound_box);
46  p = G_realloc((void *)list->box, size);
47 
48  if (p == NULL)
49  return 0;
50  list->box = (struct bound_box *)p;
51  }
52 
53  list->alloc_values = list->n_values + 1000;
54  }
55 
56  list->id[list->n_values] = id;
57  if (list->have_boxes)
58  list->box[list->n_values] = *box;
59  list->n_values++;
60 
61  return 1;
62 }
#define NULL
Definition: ccmath.h:32
#define G_realloc(p, n)
Definition: defs/gis.h:96
Bounding box.
Definition: dig_structs.h:64
List of bounding boxes with id.
Definition: dig_structs.h:1723
Definition: manage.h:4
int dig_init_boxlist(struct boxlist *list, int have_boxes)
int dig_boxlist_add(struct boxlist *list, int id, const struct bound_box *box)