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86 lines
1.7 KiB
C
86 lines
1.7 KiB
C
/*
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* array.c - Growable baseless 2D array
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*
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* Written 2010 by Werner Almesberger
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* Copyright 2010 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdlib.h>
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#include "util.h"
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#include "array.h"
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static void resize(struct array *a,
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int nx0, int nx1, int ny0, int ny1)
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{
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int ox, oy, nx, ny;
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int n, x, y;
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int *tmp;
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ox = a->max_x-a->min_x;
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oy = a->max_y-a->min_y;
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nx = nx1-nx0;
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ny = ny1-ny0;
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if (ox == nx && oy == ny)
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return;
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n = (nx+1)*(ny+1);
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tmp = alloc_size(n*sizeof(int));
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for (x = 0; x != n; x++)
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tmp[x] = UNDEF;
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for (x = a->min_x; x <= a->max_x; x++)
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for (y = a->min_y; y <= a->max_y; y++)
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tmp[x-nx0+(nx+1)*(y-ny0)] =
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a->data[x-a->min_x+(ox+1)*(y-a->min_y)];
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free(a->data);
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a->data = tmp;
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a->min_x = nx0;
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a->max_x = nx1;
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a->min_y = ny0;
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a->max_y = ny1;
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}
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struct array *new_array(void)
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{
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struct array *a;
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a = alloc_type(struct array);
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a->data = NULL;
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return a;
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}
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void free_array(struct array *a)
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{
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free(a->data);
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free(a);
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}
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void set(struct array *a, int x, int y, int z)
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{
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if (!a->data) {
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a->min_x = a->max_x = x;
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a->min_y = a->max_y = y;
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a->min_z = a->max_z = z;
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a->data = alloc_type(int);
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*a->data = z;
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} else {
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resize(a,
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x < a->min_x ? x : a->min_x, x > a->max_x ? x : a->max_x,
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y < a->min_y ? y : a->min_y, y > a->max_y ? y : a->max_y);
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if (z < a->min_z)
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a->min_z = z;
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if (z > a->max_z)
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a->max_z = z;
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a->data[x-a->min_x+(a->max_x-a->min_x+1)*(y-a->min_y)] = z;
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}
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}
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