static int
hwdb_add_property (sd_hwdb * hwdb, const char *key, const char *value)
{
int r;
assert (hwdb);
assert (key);
assert (value);
/*
* Silently ignore all properties which do not start with a
* space; future extensions might use additional prefixes.
*/
if (key[0] != ' ')
return 0;
key++;
r = ordered_hashmap_ensure_allocated (&hwdb->properties, &string_hash_ops);
if (r < 0)
return r;
r = ordered_hashmap_replace (hwdb->properties, key, (char *) value);
if (r < 0)
return r;
hwdb->properties_modified = true;
return 0;
}
static int hwdb_add_property(sd_hwdb *hwdb, const struct trie_value_entry_f *entry) {
const char *key;
int r;
assert(hwdb);
key = trie_string(hwdb, entry->key_off);
/*
* Silently ignore all properties which do not start with a
* space; future extensions might use additional prefixes.
*/
if (key[0] != ' ')
return 0;
key++;
if (le64toh(hwdb->head->value_entry_size) >= sizeof(struct trie_value_entry2_f)) {
const struct trie_value_entry2_f *old, *entry2;
entry2 = (const struct trie_value_entry2_f *)entry;
old = ordered_hashmap_get(hwdb->properties, key);
if (old) {
/* On duplicates, we order by filename priority and line-number.
*
* v2 of the format had 64 bits for the line number.
* v3 reuses top 32 bits of line_number to store the priority.
* We check the top bits — if they are zero we have v2 format.
* This means that v2 clients will print wrong line numbers with
* v3 data.
*
* For v3 data: we compare the priority (of the source file)
* and the line number.
*
* For v2 data: we rely on the fact that the filenames in the hwdb
* are added in the order of priority (higher later), because they
* are *processed* in the order of priority. So we compare the
* indices to determine which file had higher priority. Comparing
* the strings alphabetically would be useless, because those are
* full paths, and e.g. /usr/lib would sort after /etc, even
* though it has lower priority. This is not reliable because of
* suffix compression, but should work for the most common case of
* /usr/lib/udev/hwbd.d and /etc/udev/hwdb.d, and is better than
* not doing the comparison at all.
*/
bool lower;
if (entry2->file_priority == 0)
lower = entry2->filename_off < old->filename_off ||
(entry2->filename_off == old->filename_off && entry2->line_number < old->line_number);
else
lower = entry2->file_priority < old->file_priority ||
(entry2->file_priority == old->file_priority && entry2->line_number < old->line_number);
if (lower)
return 0;
}
}
r = ordered_hashmap_ensure_allocated(&hwdb->properties, &string_hash_ops);
if (r < 0)
return r;
r = ordered_hashmap_replace(hwdb->properties, key, (void *)entry);
if (r < 0)
return r;
hwdb->properties_modified = true;
return 0;
}
