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New name UI_UPDATE for interpret_move's return "".

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Now midend.c directly tests the returned pointer for equality to this
value, instead of checking whether it's the empty string.

A minor effect of this is that games may now return a dynamically
allocated empty string from interpret_move() and treat it as just
another legal move description. But I don't expect anyone to be
perverse enough to actually do that! The main purpose is that it
avoids returning a string literal from a function whose return type is
a pointer to _non-const_ char, i.e. we are now one step closer to
being able to make this code base clean under -Wwrite-strings.
This commit is contained in:
Simon Tatham
2017-10-01 12:52:12 +01:00
parent edcf839d4c
commit eeb2db283d
41 changed files with 217 additions and 201 deletions
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4
flip.c
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@ -951,7 +951,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
tx = ui->cx; ty = ui->cy;
ui->cdraw = 1;
}
nullret = "";
nullret = UI_UPDATE;
if (tx >= 0 && tx < w && ty >= 0 && ty < h) {
/*
@ -985,7 +985,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
ui->cx = min(max(ui->cx, 0), state->w - 1);
ui->cy = min(max(ui->cy, 0), state->h - 1);
ui->cdraw = 1;
nullret = "";
nullret = UI_UPDATE;
}
return nullret;