* Parse a single register field from a .ref line. * Handles "????", "HHHH", "??HH" (lo only), "HH??" (hi only). * Returns pointer past the field (always consumes exactly 4 chars + leading ws). * *out : parsed value; 0 if lo-only (high byte unknown), val<<8 if hi-only. * REF_DONTCARE if "????". * *care_mask is 1 for low byte OR'd 2 for high byte a number (not ?) */
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