💾 Archived View for thrig.me › blog › 2024 › 03 › 19 › grid-factory.c captured on 2024-03-21 at 15:41:14.
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#include <stdio.h>
#include <stdlib.h>
int **
make(size_t x, size_t y)
{
int **map;
if (!(map = malloc(x * sizeof(int *)))) abort();
if (!(map[0] = calloc((size_t) x * y, sizeof(int)))) abort();
for (size_t i = 1; i < x; i++)
map[i] = map[0] + i * y;
return map;
}
void
set(int **gp, size_t rows, size_t cols)
{
int i = 1;
for (size_t r = 0; r < rows; ++r)
for (size_t c = 0; c < cols; ++c)
gp[r][c] = i++;
}
void
show(int **gp, size_t rows, size_t cols)
{
for (size_t r = 0; r < rows; ++r) {
for (size_t c = 0; c < cols; ++c) {
printf("%d", gp[r][c]);
}
putchar('\n');
}
}
int
main(int argc, char *argv[])
{
int **blah = make(3, 3);
set(blah, 3, 3);
show(blah, 3, 3);
}