struct_alloc.c

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/*
 ****************************************************************************
 *
 * MODULE:       Vector library 
 *              
 * AUTHOR(S):    Dave Gerdes, CERL.
 *               Update to GRASS 5.7 Radim Blazek.
 *
 * PURPOSE:      Lower level functions for reading/writing/manipulating vectors.
 *
 * COPYRIGHT:    (C) 2001 by the GRASS Development Team
 *
 *               This program is free software under the GNU General Public
 *              License (>=v2). Read the file COPYING that comes with GRASS
 *              for details.
 *
 *****************************************************************************/

#include <stdlib.h>
#include <grass/Vect.h>

/*  These routines all eventually call calloc() to allocate and zero
 **  the new space.  BUT It is not neccessarily safe to assume that
 **  the memory will be zero.  The next memory location asked for could
 **  have been previously used and not zeroed.  (e.g. compress())
 */

/* alloc_node (map, add)
 ** alloc_line (map, add)
 ** alloc_area (map, add)
 ** alloc_points (map, num)
 ** node_alloc_line (node, add)
 ** area_alloc_line (node, add)
 **
 ** Allocate array space to add 'add' elements
 */


/* allocate new node structure */
P_NODE *dig_alloc_node()
{
    P_NODE *Node;

    Node = (P_NODE *) G_malloc(sizeof(P_NODE));
    if (Node == NULL)
        return NULL;

    Node->n_lines = 0;
    Node->alloc_lines = 0;
    Node->lines = NULL;
    Node->angles = NULL;

    return (Node);
}

/* dig_node_alloc_line (node, add)
 **     allocate space in  P_node,  lines and angles arrays to add 'add' more
 **     lines
 **
 **  Returns   0 ok    or    -1 on error
 */

int dig_node_alloc_line(P_NODE * node, int add)
{
    int num;
    char *p;

    G_debug(3, "dig_node_alloc_line(): add = %d", add);

    num = node->n_lines + add;

    p = G_realloc(node->lines, num * sizeof(plus_t));
    if (p == NULL)
        return -1;
    node->lines = (plus_t *) p;

    p = G_realloc(node->angles, num * sizeof(float));
    if (p == NULL)
        return -1;
    node->angles = (float *)p;

    node->alloc_lines = num;
    return (0);
}


/* Reallocate array of pointers to nodes.
 *  Space for 'add' number of nodes is added.
 * 
 *  Returns: 0 success
 *          -1 error
 */
int dig_alloc_nodes(struct Plus_head *Plus, int add)
{
    int size;
    char *p;

    size = Plus->alloc_nodes + 1 + add;
    p = G_realloc(Plus->Node, size * sizeof(P_NODE *));
    if (p == NULL)
        return -1;

    Plus->Node = (P_NODE **) p;
    Plus->alloc_nodes = size - 1;

    return (0);
}

/* allocate new line structure */
P_LINE *dig_alloc_line()
{
    P_LINE *Line;

    Line = (P_LINE *) G_malloc(sizeof(P_LINE));
    if (Line == NULL)
        return NULL;

    return (Line);
}

/* Reallocate array of pointers to lines.
 *  Space for 'add' number of lines is added.
 * 
 *  Returns: 0 success
 *          -1 error
 */
int dig_alloc_lines(struct Plus_head *Plus, int add)
{
    int size;
    char *p;

    size = Plus->alloc_lines + 1 + add;
    p = G_realloc(Plus->Line, size * sizeof(P_LINE *));
    if (p == NULL)
        return -1;

    Plus->Line = (P_LINE **) p;
    Plus->alloc_lines = size - 1;

    return (0);
}

/* Reallocate array of pointers to areas.
 *  Space for 'add' number of areas is added.
 * 
 *  Returns: 0 success
 *          -1 error
 */
int dig_alloc_areas(struct Plus_head *Plus, int add)
{
    int size;
    char *p;

    size = Plus->alloc_areas + 1 + add;
    p = G_realloc(Plus->Area, size * sizeof(P_AREA *));
    if (p == NULL)
        return -1;

    Plus->Area = (P_AREA **) p;
    Plus->alloc_areas = size - 1;

    return (0);
}

/* Reallocate array of pointers to isles.
 *  Space for 'add' number of isles is added.
 * 
 *  Returns: 0 success
 *          -1 error
 */
int dig_alloc_isles(struct Plus_head *Plus, int add)
{
    int size;
    char *p;

    G_debug(3, "dig_alloc_isle():");
    size = Plus->alloc_isles + 1 + add;
    p = G_realloc(Plus->Isle, size * sizeof(P_ISLE *));
    if (p == NULL)
        return -1;

    Plus->Isle = (P_ISLE **) p;
    Plus->alloc_isles = size - 1;

    return (0);
}

/* allocate new area structure */
P_AREA *dig_alloc_area()
{
    P_AREA *Area;

    Area = (P_AREA *) G_malloc(sizeof(P_AREA));
    if (Area == NULL)
        return NULL;

    Area->n_lines = 0;
    Area->alloc_lines = 0;
    Area->lines = NULL;

    Area->alloc_isles = 0;
    Area->n_isles = 0;
    Area->isles = NULL;

    Area->centroid = 0;

    return (Area);
}

/* alloc new isle structure */
P_ISLE *dig_alloc_isle()
{
    P_ISLE *Isle;

    Isle = (P_ISLE *) G_malloc(sizeof(P_ISLE));
    if (Isle == NULL)
        return NULL;

    Isle->n_lines = 0;
    Isle->alloc_lines = 0;
    Isle->lines = NULL;

    Isle->area = 0;

    return (Isle);
}


/* allocate room for  'num'   X and Y  arrays in struct line_pnts 
 **   returns -1 on out of memory 
 */
int dig_alloc_points(struct line_pnts *points, int num)
{
    int alloced;
    char *p;

    alloced = points->alloc_points;
    /* alloc_space will just return if no space is needed */
    if (!(p =
          dig__alloc_space(num, &alloced, 50, (char *)points->x,
                           sizeof(double)))) {
        return (dig_out_of_memory());
    }
    points->x = (double *)p;

    alloced = points->alloc_points;
    /* alloc_space will just return if no space is needed */
    if (!(p =
          dig__alloc_space(num, &alloced, 50, (char *)points->y,
                           sizeof(double)))) {
        return (dig_out_of_memory());
    }
    points->y = (double *)p;

    alloced = points->alloc_points;
    /* alloc_space will just return if no space is needed */
    if (!(p =
          dig__alloc_space(num, &alloced, 50, (char *)points->z,
                           sizeof(double)))) {
        return (dig_out_of_memory());
    }
    points->z = (double *)p;

    points->alloc_points = alloced;
    return (0);
}

/* allocate room for  'num'  fields and category arrays 
 ** in struct line_cats 
 **   returns -1 on out of memory 
 */
int dig_alloc_cats(struct line_cats *cats, int num)
{
    int alloced;
    char *p;

    /* alloc_space will just return if no space is needed */
    alloced = cats->alloc_cats;
    if (!(p =
          dig__alloc_space(num, &alloced, 1, (int *)cats->field,
                           sizeof(int)))) {
        return (dig_out_of_memory());
    }
    cats->field = (int *)p;

    alloced = cats->alloc_cats;
    if (!(p =
          dig__alloc_space(num, &alloced, 1, (int *)cats->cat,
                           sizeof(int)))) {
        return (dig_out_of_memory());
    }
    cats->cat = (int *)p;

    cats->alloc_cats = alloced;
    return (0);
}

/* area_alloc_line (area, add)
 **     allocate space in  P_area for add new lines
 **
 **  Returns   0 ok    or    -1 on error
 */
int dig_area_alloc_line(P_AREA * area, int add)
{
    int num;
    char *p;

    num = area->alloc_lines + add;

    p = G_realloc(area->lines, num * sizeof(plus_t));
    if (p == NULL)
        return -1;
    area->lines = (plus_t *) p;

    area->alloc_lines = num;

    return (0);
}

/* area_alloc_isle (area, add)
 **     allocate space in  P_area for add new isles
 **
 **  Returns   0 ok    or    -1 on error
 */
int dig_area_alloc_isle(P_AREA * area, int add)
{
    int num;
    char *p;

    G_debug(5, "dig_area_alloc_isle(): add = %d", add);
    num = area->alloc_isles + add;

    p = G_realloc(area->isles, num * sizeof(plus_t));
    if (p == NULL)
        return -1;
    area->isles = (plus_t *) p;

    area->alloc_isles = num;
    return (0);
}

/* dig_isle_alloc_line (isle, add)
 **     allocate space in  P_isle for add new lines
 **
 **  Returns   0 ok    or    -1 on error
 */

int dig_isle_alloc_line(P_ISLE * isle, int add)
{
    int num;
    char *p;

    G_debug(3, "dig_isle_alloc_line():");
    num = isle->alloc_lines + add;

    p = G_realloc(isle->lines, num * sizeof(plus_t));
    if (p == NULL)
        return -1;
    isle->lines = (plus_t *) p;

    isle->alloc_lines = num;

    return (0);
}



/* for now just print message and return error code */
int dig_out_of_memory()
{
    fprintf(stderr, "OUT OF MEMORY!\n");
    return (-1);
}