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scrollback: don't scroll past scrollback history

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Daniel Eklöf 2019-07-10 09:29:36 +02:00
parent b058e6384a
commit 1d338f8477
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GPG key ID: 5BBD4992C116573F
1 changed files with 33 additions and 6 deletions
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39
commands.c
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@ -8,6 +8,7 @@
#include "grid.h"
#define max(x, y) ((x) > (y) ? (x) : (y))
#define min(x, y) ((x) < (y) ? (x) : (y))
void
cmd_scrollback_up(struct terminal *term, int rows)
@ -15,10 +16,12 @@ cmd_scrollback_up(struct terminal *term, int rows)
if (term->grid == &term->alt)
return;
assert(term->grid->offset >= 0);
int new_view = (term->grid->view + term->grid->num_rows - rows) % term->grid->num_rows;
rows = min(rows, term->grid->num_rows - term->rows);
LOG_WARN("%d" ,new_view);
assert(term->grid->offset >= 0);
assert(rows <= term->rows);
int new_view = (term->grid->view + term->grid->num_rows - rows) % term->grid->num_rows;
assert(new_view >= 0);
assert(new_view < term->grid->num_rows);
@ -26,6 +29,17 @@ cmd_scrollback_up(struct terminal *term, int rows)
while (!term->grid->rows[new_view]->initialized)
new_view = (new_view + 1) % term->grid->num_rows;
/* Don't scroll past scrollback history */
int end = (term->grid->offset + term->rows) % term->grid->num_rows;
if (end >= term->grid->offset) {
/* Not wrapped */
if (new_view >= term->grid->offset && new_view < end)
new_view = end;
} else {
if (new_view >= term->grid->offset || new_view < end)
new_view = end;
}
LOG_DBG("scrollback UP: %d -> %d (offset = %d, rows = %d)",
term->grid->view, new_view, term->grid->offset, term->grid->num_rows);
term->grid->view = new_view;
@ -43,10 +57,11 @@ cmd_scrollback_down(struct terminal *term, int rows)
if (term->grid == &term->alt)
return;
assert(term->grid->offset >= 0);
int new_view = (term->grid->view + rows) % term->grid->num_rows;
rows = min(rows, term->grid->num_rows - term->rows);
LOG_WARN("%d" ,new_view);
assert(term->grid->offset >= 0);
int new_view = (term->grid->view + rows) % term->grid->num_rows;
assert(new_view >= 0);
assert(new_view < term->grid->num_rows);
@ -65,6 +80,18 @@ cmd_scrollback_down(struct terminal *term, int rows)
}
} while (!all_initialized);
/* Don't scroll past scrollback history */
int end = (term->grid->offset + term->rows) % term->grid->num_rows;
if (end >= term->grid->offset) {
/* Not wrapped */
if (new_view >= term->grid->offset && new_view < end)
new_view = term->grid->offset;
} else {
if (new_view >= term->grid->offset || new_view < end)
new_view = term->grid->offset;
}
LOG_DBG("scrollback DOWN: %d -> %d (offset = %d, rows = %d)",
term->grid->view, new_view, term->grid->offset, term->grid->num_rows);
term->grid->view = new_view;