static int mbfl_filt_ident_jis()

in libmbfl/filters/mbfilter_jis.c [489:585]

• 79 lines of code
• 30 McCabe index (conditional complexity)

static int mbfl_filt_ident_jis(int c, mbfl_identify_filter *filter)
{
retry:
	switch (filter->status & 0xf) {
/*	case 0x00:	 ASCII */
/*	case 0x10:	 X 0201 latin */
/*	case 0x20:	 X 0201 kana */
/*	case 0x80:	 X 0208 */
/*	case 0x90:	 X 0212 */
	case 0:
		if (c == 0x1b) {
			filter->status += 2;
		} else if (c == 0x0e) {			/* "kana in" */
			filter->status = 0x20;
		} else if (c == 0x0f) {			/* "kana out" */
			filter->status = 0;
		} else if ((filter->status == 0x80 || filter->status == 0x90) && c > 0x20 && c < 0x7f) {		/* kanji first char */
			filter->status += 1;
		} else if (c >= 0 && c < 0x80) {		/* latin, CTLs */
			;
		} else {
			filter->flag = 1;	/* bad */
		}
		break;

/*	case 0x81:	 X 0208 second char */
/*	case 0x91:	 X 0212 second char */
	case 1:
		filter->status &= ~0xf;
		if (c == 0x1b) {
			goto retry;
		} else if (c < 0x21 || c > 0x7e) {		/* bad */
			filter->flag = 1;
		}
		break;

	/* ESC */
	case 2:
		if (c == 0x24) {		/* '$' */
			filter->status++;
		} else if (c == 0x28) {		/* '(' */
			filter->status += 3;
		} else {
			filter->flag = 1;	/* bad */
			filter->status &= ~0xf;
			goto retry;
		}
		break;

	/* ESC $ */
	case 3:
		if (c == 0x40 || c == 0x42) {		/* '@' or 'B' */
			filter->status = 0x80;
		} else if (c == 0x28) {		/* '(' */
			filter->status++;
		} else {
			filter->flag = 1;	/* bad */
			filter->status &= ~0xf;
			goto retry;
		}
		break;

	/* ESC $ ( */
	case 4:
		if (c == 0x40 || c == 0x42) {		/* '@' or 'B' */
			filter->status = 0x80;
		} else if (c == 0x44) {		/* 'D' */
			filter->status = 0x90;
		} else {
			filter->flag = 1;	/* bad */
			filter->status &= ~0xf;
			goto retry;
		}
		break;

	/* ESC ( */
	case 5:
		if (c == 0x42 || c == 0x48) {		/* 'B' or 'H' */
			filter->status = 0;
		} else if (c == 0x4a) {		/* 'J' */
			filter->status = 0x10;
		} else if (c == 0x49) {		/* 'I' */
			filter->status = 0x20;
		} else {
			filter->flag = 1;	/* bad */
			filter->status &= ~0xf;
			goto retry;
		}
		break;

	default:
		filter->status = 0;
		break;
	}

	return c;
}