Function hashTypeNext

src/t_hash.cpp:351–384

Move to the next entry in the hash. Return C_OK when the next entry * could be found and C_ERR when the iterator reaches the end. */

/* Move to the next entry in the hash. Return C_OK when the next entry
 * could be found and C_ERR when the iterator reaches the end. */
int hashTypeNext(hashTypeIterator *hi) {
    if (hi->encoding == OBJ_ENCODING_ZIPLIST) {
        unsigned char *zl;
        unsigned char *fptr, *vptr;

        zl = (unsigned char*)hi->subject->m_ptr;
        fptr = hi->fptr;
        vptr = hi->vptr;

        if (fptr == NULL) {
            /* Initialize cursor */
            serverAssert(vptr == NULL);
            fptr = ziplistIndex(zl, 0);
        } else {
            /* Advance cursor */
            serverAssert(vptr != NULL);
            fptr = ziplistNext(zl, vptr);
        }
        if (fptr == NULL) return C_ERR;

        /* Grab pointer to the value (fptr points to the field) */
        vptr = ziplistNext(zl, fptr);
        serverAssert(vptr != NULL);

        /* fptr, vptr now point to the first or next pair */
        hi->fptr = fptr;
        hi->vptr = vptr;
    } else if (hi->encoding == OBJ_ENCODING_HT) {
        if ((hi->de = dictNext(hi->di)) == NULL) return C_ERR;
    } else {
        serverPanic("Unknown hash encoding");
    }
    return C_OK;
}

/* Get the field or value at iterator cursor, for an iterator on a hash value
 * encoded as a ziplist. Prototype is similar to `hashTypeGetFromZiplist`. */