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James Harvey points out that entering an invalid game ID can affect

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the current midend state even if you don't subsequently enter a
valid one. Reorganise midend_game_id_int() so that (just like
midend_deserialise()) it does all its error checking before altering
anything in the midend's persistent data, so that it either succeeds
completely or fails before doing anything at all.

[originally from svn r6045]
This commit is contained in:
Simon Tatham
2005-07-01 16:50:49 +00:00
parent 091fe57e0f
commit 8dd7ee3007
1 changed files with 54 additions and 16 deletions
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70
midend.c
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@ -855,6 +855,8 @@ config_item *midend_get_config(midend_data *me, int which, char **wintitle)
static char *midend_game_id_int(midend_data *me, char *id, int defmode) static char *midend_game_id_int(midend_data *me, char *id, int defmode)
{ {
char *error, *par, *desc, *seed; char *error, *par, *desc, *seed;
game_params *newcurparams, *newparams, *oldparams1, *oldparams2;
int free_params;
seed = strchr(id, '#'); seed = strchr(id, '#');
desc = strchr(id, ':'); desc = strchr(id, ':');
@ -894,18 +896,24 @@ static char *midend_game_id_int(midend_data *me, char *id, int defmode)
} }
} }
/*
* We must be reasonably careful here not to modify anything in
* `me' until we have finished validating things. This function
* must either return an error and do nothing to the midend, or
* return success and do everything; nothing in between is
* acceptable.
*/
newcurparams = newparams = oldparams1 = oldparams2 = NULL;
if (par) { if (par) {
game_params *tmpparams; newcurparams = me->ourgame->dup_params(me->params);
tmpparams = me->ourgame->dup_params(me->params); me->ourgame->decode_params(newcurparams, par);
me->ourgame->decode_params(tmpparams, par); error = me->ourgame->validate_params(newcurparams);
error = me->ourgame->validate_params(tmpparams);
if (error) { if (error) {
me->ourgame->free_params(tmpparams); me->ourgame->free_params(newcurparams);
return error; return error;
} }
if (me->curparams) oldparams1 = me->curparams;
me->ourgame->free_params(me->curparams);
me->curparams = tmpparams;
/* /*
* Now filter only the persistent parts of this state into * Now filter only the persistent parts of this state into
@ -913,16 +921,50 @@ static char *midend_game_id_int(midend_data *me, char *id, int defmode)
* received a params string in which case the whole lot is * received a params string in which case the whole lot is
* persistent. * persistent.
*/ */
oldparams2 = me->params;
if (seed || desc) { if (seed || desc) {
char *tmpstr = me->ourgame->encode_params(tmpparams, FALSE); char *tmpstr;
me->ourgame->decode_params(me->params, tmpstr);
newparams = me->ourgame->dup_params(me->params);
tmpstr = me->ourgame->encode_params(newcurparams, FALSE);
me->ourgame->decode_params(newparams, tmpstr);
sfree(tmpstr); sfree(tmpstr);
} else { } else {
me->ourgame->free_params(me->params); newparams = me->ourgame->dup_params(newcurparams);
me->params = me->ourgame->dup_params(tmpparams); }
free_params = TRUE;
} else {
newcurparams = me->curparams;
newparams = me->params;
free_params = FALSE;
}
if (desc) {
error = me->ourgame->validate_desc(newparams, desc);
if (error) {
if (free_params) {
if (newcurparams)
me->ourgame->free_params(newcurparams);
if (newparams)
me->ourgame->free_params(newparams);
}
return error;
} }
} }
/*
* Now we've got past all possible error points. Update the
* midend itself.
*/
me->params = newparams;
me->curparams = newcurparams;
if (oldparams1)
me->ourgame->free_params(oldparams1);
if (oldparams2)
me->ourgame->free_params(oldparams2);
sfree(me->desc); sfree(me->desc);
sfree(me->privdesc); sfree(me->privdesc);
me->desc = me->privdesc = NULL; me->desc = me->privdesc = NULL;
@ -930,10 +972,6 @@ static char *midend_game_id_int(midend_data *me, char *id, int defmode)
me->seedstr = NULL; me->seedstr = NULL;
if (desc) { if (desc) {
error = me->ourgame->validate_desc(me->params, desc);
if (error)
return error;
me->desc = dupstr(desc); me->desc = dupstr(desc);
me->genmode = GOT_DESC; me->genmode = GOT_DESC;
sfree(me->aux_info); sfree(me->aux_info);