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box-drawing: {h,v}line() + rect(): ensure *end* row/col is >= 0

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Daniel Eklöf 2021-01-08 10:26:26 +01:00
parent c009150ec0
commit 4bb056bb4b
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GPG key ID: 5BBD4992C116573F
1 changed files with 3 additions and 3 deletions
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6
box-drawing.c
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@ -37,7 +37,7 @@ _hline(struct buf *buf, int x1, int x2, int y, int thick)
x1 = min(max(x1, 0), buf->width);
x2 = min(max(x2, 0), buf->width);
for (size_t row = max(y, 0); row < min(y + thick, buf->height); row++) {
for (size_t row = max(y, 0); row < max(min(y + thick, buf->height), 0); row++) {
for (size_t col = x1; col < x2; col++) {
size_t idx = col / 8;
size_t bit_no = col % 8;
@ -55,7 +55,7 @@ _vline(struct buf *buf, int y1, int y2, int x, int thick)
y2 = min(max(y2, 0), buf->height);
for (size_t row = y1; row < y2; row++) {
for (size_t col = max(x, 0); col < min(x + thick, buf->width); col++) {
for (size_t col = max(x, 0); col < max(min(x + thick, buf->width), 0); col++) {
size_t idx = col / 8;
size_t bit_no = col % 8;
buf->data[row * buf->stride + idx] |= 1 << bit_no;
@ -69,7 +69,7 @@ static void NOINLINE
_rect(struct buf *buf, int x1, int y1, int x2, int y2)
{
for (size_t row = max(y1, 0); row < min(y2, buf->height); row++) {
for (size_t col = max(x1, 0); col < min(x2, buf->width); col++) {
for (size_t col = max(x1, 0); col < max(min(x2, buf->width), 0); col++) {
size_t idx = col / 8;
size_t bit_no = col % 8;
buf->data[row * buf->stride + idx] |= 1 << bit_no;