Function gb_intern

src/graph_buffer/graph_buffer.c:134–145

Intern a repetitive string into the buffer's pool: identical content collapses * to a single heap copy owned by the pool. NULL maps to "{}" (matches * heap_strdup). The returned pointer is stable for the buffer's lifetime and * must never be freed or mutated by callers. Returns NULL only on OOM. */

 * heap_strdup). The returned pointer is stable for the buffer's lifetime and
 * must never be freed or mutated by callers. Returns NULL only on OOM. */
static const char *gb_intern(cbm_gbuf_t *gb, const char *s) {
    const char *key = s ? s : "{}";
    const char *found = cbm_ht_get(gb->intern_pool, key);
    if (found) {
        return found;
    }
    char *copy = strdup(key);
    if (copy) {
        cbm_ht_set(gb->intern_pool, copy, copy); /* key == value == owned copy */
    }
    return copy;
}

static void make_id_key(char *buf, size_t bufsz, int64_t id) {
    snprintf(buf, bufsz, "%lld", (long long)id);