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grid: swap_row: drop requirement that row indices be positive

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Daniel Eklöf 2019-07-10 19:17:53 +02:00
parent 4ffd93ca4c
commit 379f7cf646
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1 changed files with 3 additions and 2 deletions
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5
grid.c
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@ -12,12 +12,13 @@ grid_swap_row(struct grid *grid, int row_a, int row_b)
{
assert(grid->offset >= 0);
assert(row_a != row_b);
assert(row_a >= 0);
assert(row_b >= 0);
int real_a = (grid->offset + row_a + grid->num_rows) % grid->num_rows;
int real_b = (grid->offset + row_b + grid->num_rows) % grid->num_rows;
assert(real_a >= 0);
assert(real_b >= 0);
struct row *tmp = grid->rows[real_a];
grid->rows[real_a] = grid->rows[real_b];
grid->rows[real_b] = tmp;