Function pg_wcswidth

src/fe_utils/mbprint.c:176–198

* pg_wcswidth is the dumb display-width function. * It assumes that everything will appear on one line. * OTOH it is easier to use than pg_wcssize if this applies to you. */

 * OTOH it is easier to use than pg_wcssize if this applies to you.
 */
int
pg_wcswidth(const char *pwcs, size_t len, int encoding)
{
	int			width = 0;

	while (len > 0)
	{
		int			chlen,
					chwidth;

		chlen = PQmblen(pwcs, encoding);
		if (len < (size_t) chlen)
			break;				/* Invalid string */

		chwidth = PQdsplen(pwcs, encoding);
		if (chwidth > 0)
			width += chwidth;

		pwcs += chlen;
		len -= chlen;
	}
	return width;
}

/*
 * pg_wcssize takes the given string in the given encoding and returns three