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David Nickerson reports that it's possible to lay a line over a 'no

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line here' cross mark by dragging, and furthermore, that doing so puts
that grid edge into a stuck state that no UI action short of undo can
get it back out of. Fix drags to stop at crosses, and fix execute_move
to fault any move string that nonetheless somehow managed to try to
set a line over a cross without explicitly tagging it 'R'.

[originally from svn r9400]
This commit is contained in:
Simon Tatham
2012-02-02 07:18:14 +00:00
parent ed63f9c50e
commit 340c300c1d
1 changed files with 18 additions and 3 deletions
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21
pearl.c
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@ -1836,7 +1836,15 @@ static void update_ui_drag(game_state *state, game_ui *ui, int gx, int gy)
if (ox == gx || oy == gy) {
int dx = (gx < ox ? -1 : gx > ox ? +1 : 0);
int dy = (gy < oy ? -1 : gy > oy ? +1 : 0);
int dir = (dy>0 ? D : dy<0 ? U : dx>0 ? R : L);
while (ox != gx || oy != gy) {
/*
* If the drag attempts to cross a 'no line here' mark,
* stop there. We physically don't allow the user to drag
* over those marks.
*/
if (state->marks[oy*w+ox] & dir)
break;
ox += dx;
oy += dy;
ui->dragcoords[ui->ndragcoords++] = oy * w + ox;
@ -2037,9 +2045,6 @@ static game_state *execute_move(game_state *state, char *move)
if (!INGRID(state, x, y)) goto badmove;
if (l < 0 || l > 15) goto badmove;
/* TODO trying to set a line over a no-line mark should be
* a failed move? */
if (c == 'L')
ret->lines[y*w + x] |= (char)l;
else if (c == 'N')
@ -2052,6 +2057,16 @@ static game_state *execute_move(game_state *state, char *move)
else if (c == 'M')
ret->marks[y*w + x] ^= (char)l;
/*
* If we ended up trying to lay a line _over_ a mark,
* that's a failed move: interpret_move() should have
* ensured we never received a move string like that in
* the first place.
*/
if ((ret->lines[y*w + x] & (char)l) &&
(ret->marks[y*w + x] & (char)l))
goto badmove;
move += n;
} else if (strcmp(move, "H") == 0) {
pearl_solve(ret->shared->w, ret->shared->h,