Function hashTypeDelete

src/t_hash.cpp:282–311

Delete an element from a hash. * Return 1 on deleted and 0 on not found. */

/* Delete an element from a hash.
 * Return 1 on deleted and 0 on not found. */
int hashTypeDelete(robj *o, sds field) {
    int deleted = 0;

    if (o->encoding == OBJ_ENCODING_ZIPLIST) {
        unsigned char *zl, *fptr;

        zl = (unsigned char*)ptrFromObj(o);
        fptr = ziplistIndex(zl, ZIPLIST_HEAD);
        if (fptr != NULL) {
            fptr = ziplistFind(zl, fptr, (unsigned char*)field, sdslen(field), 1);
            if (fptr != NULL) {
                zl = ziplistDelete(zl,&fptr); /* Delete the key. */
                zl = ziplistDelete(zl,&fptr); /* Delete the value. */
                o->m_ptr = zl;
                deleted = 1;
            }
        }
    } else if (o->encoding == OBJ_ENCODING_HT) {
        if (dictDelete((dict*)ptrFromObj(o), field) == C_OK) {
            deleted = 1;

            /* Always check if the dictionary needs a resize after a delete. */
            if (htNeedsResize((dict*)ptrFromObj(o))) dictResize((dict*)ptrFromObj(o));
        }

    } else {
        serverPanic("Unknown hash encoding");
    }
    return deleted;
}

/* Return the number of elements in a hash. */
unsigned long hashTypeLength(robj_roptr o) {