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csi: ignore invalid scrolling regions

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There must be at least one scrolling row. I.e. the bottom margin must
be larger than the top margin.

Note that trying to set an invalid region really will
be *ignored*. I.e. we *don't* reset the scrolling region.

This conforms to xterm's behavior.
This commit is contained in:
Daniel Eklöf 2019-09-29 14:58:02 +02:00
parent 5a0bb292ee
commit 4594899114
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GPG key ID: 5BBD4992C116573F
1 changed files with 10 additions and 7 deletions
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17
csi.c
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@ -617,15 +617,18 @@ csi_dispatch(struct terminal *term, uint8_t final)
int start = vt_param_get(term, 0, 1);
int end = min(vt_param_get(term, 1, term->rows), term->rows);
/* 1-based */
term->scroll_region.start = start - 1;
term->scroll_region.end = end;
if (end > start) {
term_cursor_to(term, start - 1, 0);
/* 1-based */
term->scroll_region.start = start - 1;
term->scroll_region.end = end;
LOG_DBG("scroll region: %d-%d",
term->scroll_region.start,
term->scroll_region.end);
term_cursor_to(term, start - 1, 0);
LOG_DBG("scroll region: %d-%d",
term->scroll_region.start,
term->scroll_region.end);
}
break;
}