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authorJesse Luehrs <doy@tozt.net>2015-08-20 01:07:56 -0400
committerJesse Luehrs <doy@tozt.net>2015-08-20 01:07:56 -0400
commit7a8324949027d7ece88af525f8ae7fe67b379e72 (patch)
treea46f20eb7e8bff3468b097fc49998d8c4233585f
parentc396fa054186763feeae3bb0de0ab82dde53e40f (diff)
downloadlibvt100-7a8324949027d7ece88af525f8ae7fe67b379e72.tar.gz
libvt100-7a8324949027d7ece88af525f8ae7fe67b379e72.zip
keep track of scrollback when scrolling
-rw-r--r--src/screen.c33
1 files changed, 28 insertions, 5 deletions
diff --git a/src/screen.c b/src/screen.c
index 8da88d6..336f2f1 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -531,11 +531,34 @@ void vt100_screen_scroll_down(VT100Screen *vt, int count)
}
}
else {
- for (i = 0; i < bottom - top + 1; ++i) {
- row = vt100_screen_row_at(vt, top + i);
- memset(
- row->cells, 0, vt->grid->max.col * sizeof(struct vt100_cell));
- row->wrapped = 0;
+ int scrollback = vt->scrollback_length;
+
+ if (vt->grid->row_count + count > scrollback) {
+ int overflow = vt->grid->row_count + count - scrollback;
+
+ vt100_screen_ensure_capacity(vt, scrollback);
+ for (i = 0; i < overflow; ++i) {
+ free(vt->grid->rows[i].cells);
+ }
+ memmove(
+ &vt->grid->rows[0], &vt->grid->rows[overflow],
+ (scrollback - overflow) * sizeof(struct vt100_row));
+ for (i = scrollback - count; i < scrollback; ++i) {
+ vt->grid->rows[i].cells = calloc(
+ vt->grid->max.col, sizeof(struct vt100_cell));
+ }
+ vt->grid->row_count = scrollback;
+ vt->grid->row_top = scrollback - vt->grid->max.row;
+ }
+ else {
+ vt100_screen_ensure_capacity(vt, vt->grid->row_count + count);
+ for (i = 0; i < count; ++i) {
+ row = vt100_screen_row_at(vt, i + vt->grid->max.row);
+ row->cells = calloc(
+ vt->grid->max.col, sizeof(struct vt100_cell));
+ }
+ vt->grid->row_count += count;
+ vt->grid->row_top += count;
}
}