=> R0 = file handle from Gdbm_Openor Gdbm_OpenIn
R1 = pointer to last keyword
R2 = length of keyword
R3 = pointer to buffer
R4 = length of buffer
<= R0 = length of keyword, or -1 if no keywords exist
Returns the next keyword from the database.
NOTE: Keywords are ordered in a hash table order. This is not necessarily alphabetic, and should not be relied on if Gdbm_Delete is called in the midst of a NextKey loop.
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