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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
net.c
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@ -2096,7 +2096,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
if (ui->cur_visible) {
ui->cur_visible = FALSE;
nullret = "";
nullret = UI_UPDATE;
}
/*
@ -2336,7 +2336,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
OFFSET(ui->cur_x, ui->cur_y, ui->cur_x, ui->cur_y, dir, state);
ui->cur_visible = TRUE;
}
return "";
return UI_UPDATE;
} else {
return NULL;
}