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53 lines
1.0 KiB
C
53 lines
1.0 KiB
C
/*
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* array.h - 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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#ifndef ARRAY_H
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#define ARRAY_H
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#include <limits.h>
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#define UNDEF INT_MAX
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struct array {
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int min_x, max_x;
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int min_y, max_y;
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int min_z, max_z;
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int *data; /* NULL if there are no points */
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};
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struct array *new_array(void);
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void free_array(struct array *a);
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void set(struct array *a, int x, int y, int z);
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static inline int get(const struct array *a, int x, int y)
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{
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return a->data[(x)-a->min_x+(a->max_x-a->min_x+1)*((y)-a->min_y)];
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}
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static inline int get_bounded(const struct array *a, int x, int y)
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{
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if (x < a->min_x || x > a->max_x)
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return UNDEF;
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if (y < a->min_y || y > a->max_y)
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return UNDEF;
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return get(a, x, y);
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}
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#endif /* !ARRAY_H */
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