static void
convert_options(const struct config_parser *parser,
struct group *parent, unsigned parent_index,
struct group **next_group,
void ***next_input_slot)
{
const struct config_parser **children = parser->children;
struct group *group = (*next_group)++;
group->parser = parser;
group->parent = parent;
group->parent_index = parent_index;
if (!children)
group->state.child_inputs = NULL;
else
{
size_t num_children;
size_t i;
for (num_children = 0; children[num_children]; num_children++)
;
group->state.child_inputs = *next_input_slot;
*next_input_slot += num_children;
for (i = 0; i < num_children; i++)
convert_options(children[i], group, i, next_group, next_input_slot);
}
}
/* Initialize GROUP from ARGP. If CVT->SHORT_END is non-NULL, short
* options are recorded in the short options string. Returns the next
* unused group entry. CVT holds state used during the conversion. */
static struct group *
convert_options (const struct argp *argp, struct group *parent,
unsigned parent_index, struct group *group,
struct parser_convert_state *cvt)
{
const struct argp_option *opt = argp->options;
const struct argp_child *children = argp->children;
if (opt || argp->parser) {
/* This parser needs a group. */
if (cvt->short_end) {
/* Record any short options. */
for (; !__option_is_end(opt); opt++) {
if (opt && __option_is_short(opt)) {
*cvt->short_end++ = (char)opt->key;
}
}
}
group->parser = argp->parser;
group->argp = argp;
group->args_processed = 0;
group->parent = parent;
group->parent_index = parent_index;
group->input = 0;
group->hook = 0;
group->child_inputs = 0;
if (children)
/* Assign GROUP's CHILD_INPUTS field some space from
CVT->child_inputs_end.*/
{
unsigned num_children = 0;
while (children[num_children].argp)
num_children++;
group->child_inputs = cvt->child_inputs_end;
cvt->child_inputs_end += num_children;
}
parent = group++;
} else {
parent = 0;
}
if (children) {
unsigned local_index = 0;
while (children->argp) {
group = convert_options(children++->argp, parent, local_index++,
group, cvt);
}
}
return group;
}
/* Allocate and initialize the group structures, so that they are
ordered as if by traversing the corresponding argp parser tree in
pre-order. Also build the list of short options, if that is needed. */
static void
parser_convert (struct parser *parser, const struct argp *argp)
{
struct parser_convert_state cvt;
cvt.parser = parser;
cvt.short_end = parser->short_opts;
cvt.child_inputs_end = parser->child_inputs;
parser->argp = argp;
if (argp)
parser->egroup = convert_options (argp, 0, 0, parser->groups, &cvt);
else
parser->egroup = parser->groups; /* No parsers at all! */
if (parser->short_opts)
*cvt.short_end ='\0';
}
static int
parser_init(struct parser_state *state,
const struct config_parser *parser,
void *input)
{
struct parser_sizes szs;
size_t group_alloc;
size_t input_alloc;
void **next_input_slot;
struct group *group;
/* Allocate and initialize group structures */
init_sizes(&szs);
calc_sizes(parser, &szs);
group_alloc = sizeof(*state->groups) * szs.num_groups;
input_alloc = sizeof(*state->child_inputs) * szs.num_child_inputs;
state->storage = malloc(group_alloc + input_alloc);
if (!state->storage)
return ENOMEM;
state->groups = state->storage;
state->egroup = state->groups + szs.num_groups;
if (szs.num_child_inputs > 0)
{
state->child_inputs = (void *) ((char *) state->storage + group_alloc);
memset(state->child_inputs, 0, input_alloc);
}
else
state->child_inputs = NULL;
group = state->groups;
next_input_slot = state->child_inputs;
convert_options(parser, NULL, 0, &group, &next_input_slot);
assert(group == state->egroup);
assert(next_input_slot == state->child_inputs + szs.num_child_inputs);
/* Call with CONFIG_KEY_INIT, for propagation of child inputs */
state->groups[0].state.input = input;
for (group = state->groups; group < state->egroup; group++)
{
int err;
if (group->parent)
group->state.input = group->parent->state.child_inputs[group->parent_index];
err = group->parser->handler(CONFIG_PARSE_KEY_INIT, 0, NULL, &group->state);
if (err && err != EINVAL)
{
/* Abort initialization */
free(state->storage);
state->storage = NULL;
return err;
}
}
return 0;
}