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Fix cursor position after zero width space, GitHub issue 3469.

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This commit is contained in:
nicm 2023-02-10 14:01:43 +00:00
parent 1262e685b8
commit 907f58cc3c
1 changed files with 21 additions and 13 deletions
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34
screen-write.c
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@ -34,7 +34,7 @@ static void screen_write_collect_flush(struct screen_write_ctx *, int,
static int screen_write_overwrite(struct screen_write_ctx *,
struct grid_cell *, u_int);
static const struct grid_cell *screen_write_combine(struct screen_write_ctx *,
const struct utf8_data *, u_int *);
const struct utf8_data *, u_int *, u_int *);
struct screen_write_citem {
u_int x;
@ -1820,7 +1820,7 @@ screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
struct grid_cell tmp_gc, now_gc;
struct tty_ctx ttyctx;
u_int sx = screen_size_x(s), sy = screen_size_y(s);
u_int width = gc->data.width, xx, last, cy;
u_int width = gc->data.width, xx, last, cx, cy;
int selected, skip = 1;
/* Ignore padding cells. */
@ -1847,18 +1847,18 @@ screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
*/
if (ctx->flags & SCREEN_WRITE_ZWJ) {
screen_write_collect_flush(ctx, 0, __func__);
screen_write_combine(ctx, &zwj, &xx);
screen_write_combine(ctx, &zwj, &xx, &cx);
}
if (width == 0 || (ctx->flags & SCREEN_WRITE_ZWJ)) {
ctx->flags &= ~SCREEN_WRITE_ZWJ;
screen_write_collect_flush(ctx, 0, __func__);
if ((gc = screen_write_combine(ctx, ud, &xx)) != NULL) {
if ((gc = screen_write_combine(ctx, ud, &xx, &cx)) != NULL) {
cy = s->cy;
screen_write_set_cursor(ctx, xx, s->cy);
screen_write_initctx(ctx, &ttyctx, 0);
ttyctx.cell = gc;
tty_write(tty_cmd_cell, &ttyctx);
s->cx = xx + 1 + gc->data.width; s->cy = cy;
s->cx = cx; s->cy = cy;
}
return;
}
@ -1980,16 +1980,19 @@ screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
/* Combine a UTF-8 zero-width character onto the previous. */
static const struct grid_cell *
screen_write_combine(struct screen_write_ctx *ctx, const struct utf8_data *ud,
u_int *xx)
u_int *xx, u_int *cx)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
static struct grid_cell gc;
u_int n;
u_int n, width;
/* Can't combine if at 0. */
if (s->cx == 0)
if (s->cx == 0) {
*xx = 0;
return (NULL);
}
*xx = s->cx;
/* Empty data is out. */
if (ud->size == 0)
@ -2003,30 +2006,35 @@ screen_write_combine(struct screen_write_ctx *ctx, const struct utf8_data *ud,
}
if (n > s->cx)
return (NULL);
*xx = s->cx - n;
/* Check there is enough space. */
if (gc.data.size + ud->size > sizeof gc.data.data)
return (NULL);
(*xx) -= n;
log_debug("%s: %.*s onto %.*s at %u,%u", __func__, (int)ud->size,
ud->data, (int)gc.data.size, gc.data.data, *xx, s->cy);
log_debug("%s: %.*s onto %.*s at %u,%u (width %u)", __func__,
(int)ud->size, ud->data, (int)gc.data.size, gc.data.data, *xx,
s->cy, gc.data.width);
/* Append the data. */
memcpy(gc.data.data + gc.data.size, ud->data, ud->size);
gc.data.size += ud->size;
width = gc.data.width;
/* If this is U+FE0F VARIATION SELECTOR-16, force the width to 2. */
if (gc.data.width == 1 &&
ud->size == 3 &&
memcmp(ud->data, "\357\270\217", 3) == 0) {
ud->size == 3 &&
memcmp(ud->data, "\357\270\217", 3) == 0) {
grid_view_set_padding(gd, (*xx) + 1, s->cy);
gc.data.width = 2;
width += 2;
}
/* Set the new cell. */
grid_view_set_cell(gd, *xx, s->cy, &gc);
*cx = (*xx) + width;
log_debug("%s: character at %u; cursor at %u", __func__, *xx, *cx);
return (&gc);
}