uint8_t GBIORead()

in cores/gba/src/gb/io.c [523:621]
97 lines of code
71 McCabe index (conditional complexity)

uint8_t GBIORead(struct GB* gb, unsigned address) {
	switch (address) {
	case REG_JOYP:
		return _readKeys(gb);
	case REG_IE:
		return gb->memory.ie;
	case REG_WAVE_0:
	case REG_WAVE_1:
	case REG_WAVE_2:
	case REG_WAVE_3:
	case REG_WAVE_4:
	case REG_WAVE_5:
	case REG_WAVE_6:
	case REG_WAVE_7:
	case REG_WAVE_8:
	case REG_WAVE_9:
	case REG_WAVE_A:
	case REG_WAVE_B:
	case REG_WAVE_C:
	case REG_WAVE_D:
	case REG_WAVE_E:
	case REG_WAVE_F:
		if (gb->audio.playingCh3) {
			if (gb->audio.ch3.readable || gb->audio.style != GB_AUDIO_DMG) {
				return gb->audio.ch3.wavedata8[gb->audio.ch3.window >> 1];
			} else {
				return 0xFF;
			}
		} else {
			return gb->audio.ch3.wavedata8[address - REG_WAVE_0];
		}
		break;
	case REG_SB:
	case REG_SC:
	case REG_IF:
	case REG_NR10:
	case REG_NR11:
	case REG_NR12:
	case REG_NR14:
	case REG_NR21:
	case REG_NR22:
	case REG_NR24:
	case REG_NR30:
	case REG_NR32:
	case REG_NR34:
	case REG_NR41:
	case REG_NR42:
	case REG_NR43:
	case REG_NR44:
	case REG_NR50:
	case REG_NR51:
	case REG_NR52:
	case REG_DIV:
	case REG_TIMA:
	case REG_TMA:
	case REG_TAC:
	case REG_STAT:
	case REG_LCDC:
	case REG_SCY:
	case REG_SCX:
	case REG_LY:
	case REG_LYC:
	case REG_BGP:
	case REG_OBP0:
	case REG_OBP1:
	case REG_WY:
	case REG_WX:
		// Handled transparently by the registers
		break;
	default:
		if (gb->model >= GB_MODEL_CGB) {
			switch (address) {
			case REG_KEY1:
			case REG_VBK:
			case REG_HDMA1:
			case REG_HDMA2:
			case REG_HDMA3:
			case REG_HDMA4:
			case REG_HDMA5:
			case REG_BCPS:
			case REG_BCPD:
			case REG_OCPS:
			case REG_OCPD:
			case REG_SVBK:
				// Handled transparently by the registers
				goto success;
			case REG_DMA:
				mLOG(GB_IO, STUB, "Reading from unknown register FF%02X", address);
				return 0;
			default:
				break;
			}
		}
		mLOG(GB_IO, STUB, "Reading from unknown register FF%02X", address);
		return 0xFF;
	}
	success:
	return gb->memory.io[address] | _registerMask[address];
}