static inline int handle_lcd_special_code()

in charlcd.c [195:363]

• 140 lines of code
• 44 McCabe index (conditional complexity)

static inline int handle_lcd_special_code(struct charlcd *lcd)
{
	struct charlcd_priv *priv = charlcd_to_priv(lcd);

	/* LCD special codes */

	int processed = 0;

	char *esc = priv->esc_seq.buf + 2;
	int oldflags = priv->flags;

	/* check for display mode flags */
	switch (*esc) {
	case 'D':	/* Display ON */
		priv->flags |= LCD_FLAG_D;
		if (priv->flags != oldflags)
			lcd->ops->display(lcd, CHARLCD_ON);

		processed = 1;
		break;
	case 'd':	/* Display OFF */
		priv->flags &= ~LCD_FLAG_D;
		if (priv->flags != oldflags)
			lcd->ops->display(lcd, CHARLCD_OFF);

		processed = 1;
		break;
	case 'C':	/* Cursor ON */
		priv->flags |= LCD_FLAG_C;
		if (priv->flags != oldflags)
			lcd->ops->cursor(lcd, CHARLCD_ON);

		processed = 1;
		break;
	case 'c':	/* Cursor OFF */
		priv->flags &= ~LCD_FLAG_C;
		if (priv->flags != oldflags)
			lcd->ops->cursor(lcd, CHARLCD_OFF);

		processed = 1;
		break;
	case 'B':	/* Blink ON */
		priv->flags |= LCD_FLAG_B;
		if (priv->flags != oldflags)
			lcd->ops->blink(lcd, CHARLCD_ON);

		processed = 1;
		break;
	case 'b':	/* Blink OFF */
		priv->flags &= ~LCD_FLAG_B;
		if (priv->flags != oldflags)
			lcd->ops->blink(lcd, CHARLCD_OFF);

		processed = 1;
		break;
	case '+':	/* Back light ON */
		priv->flags |= LCD_FLAG_L;
		if (priv->flags != oldflags)
			charlcd_backlight(lcd, CHARLCD_ON);

		processed = 1;
		break;
	case '-':	/* Back light OFF */
		priv->flags &= ~LCD_FLAG_L;
		if (priv->flags != oldflags)
			charlcd_backlight(lcd, CHARLCD_OFF);

		processed = 1;
		break;
	case '*':	/* Flash back light */
		charlcd_poke(lcd);
		processed = 1;
		break;
	case 'f':	/* Small Font */
		priv->flags &= ~LCD_FLAG_F;
		if (priv->flags != oldflags)
			lcd->ops->fontsize(lcd, CHARLCD_FONTSIZE_SMALL);

		processed = 1;
		break;
	case 'F':	/* Large Font */
		priv->flags |= LCD_FLAG_F;
		if (priv->flags != oldflags)
			lcd->ops->fontsize(lcd, CHARLCD_FONTSIZE_LARGE);

		processed = 1;
		break;
	case 'n':	/* One Line */
		priv->flags &= ~LCD_FLAG_N;
		if (priv->flags != oldflags)
			lcd->ops->lines(lcd, CHARLCD_LINES_1);

		processed = 1;
		break;
	case 'N':	/* Two Lines */
		priv->flags |= LCD_FLAG_N;
		if (priv->flags != oldflags)
			lcd->ops->lines(lcd, CHARLCD_LINES_2);

		processed = 1;
		break;
	case 'l':	/* Shift Cursor Left */
		if (lcd->addr.x > 0) {
			if (!lcd->ops->shift_cursor(lcd, CHARLCD_SHIFT_LEFT))
				lcd->addr.x--;
		}

		processed = 1;
		break;
	case 'r':	/* shift cursor right */
		if (lcd->addr.x < lcd->width) {
			if (!lcd->ops->shift_cursor(lcd, CHARLCD_SHIFT_RIGHT))
				lcd->addr.x++;
		}

		processed = 1;
		break;
	case 'L':	/* shift display left */
		lcd->ops->shift_display(lcd, CHARLCD_SHIFT_LEFT);
		processed = 1;
		break;
	case 'R':	/* shift display right */
		lcd->ops->shift_display(lcd, CHARLCD_SHIFT_RIGHT);
		processed = 1;
		break;
	case 'k': {	/* kill end of line */
		int x, xs, ys;

		xs = lcd->addr.x;
		ys = lcd->addr.y;
		for (x = lcd->addr.x; x < lcd->width; x++)
			lcd->ops->print(lcd, ' ');

		/* restore cursor position */
		lcd->addr.x = xs;
		lcd->addr.y = ys;
		lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);
		processed = 1;
		break;
	}
	case 'I':	/* reinitialize display */
		lcd->ops->init_display(lcd);
		priv->flags = ((lcd->height > 1) ? LCD_FLAG_N : 0) | LCD_FLAG_D |
			LCD_FLAG_C | LCD_FLAG_B;
		processed = 1;
		break;
	case 'G':
		if (lcd->ops->redefine_char)
			processed = lcd->ops->redefine_char(lcd, esc);
		else
			processed = 1;
		break;

	case 'x':	/* gotoxy : LxXXX[yYYY]; */
	case 'y':	/* gotoxy : LyYYY[xXXX]; */
		if (priv->esc_seq.buf[priv->esc_seq.len - 1] != ';')
			break;

		/* If the command is valid, move to the new address */
		if (parse_xy(esc, &lcd->addr.x, &lcd->addr.y))
			lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);

		/* Regardless of its validity, mark as processed */
		processed = 1;
		break;
	}

	return processed;
}