Obscure code.

[jerry waldorf]

	I am porting some code from a sun to hp and ran across
this:

static int scanit(str, fmt, args)
register char *str;
char *fmt;
char **args;
{
	FILE _strbuf;

	_strbuf._flag = _IOREAD | _IOSTRG;
	_strbuf._ptr = _strbuf._base = (unsigned char *) str;
	_strbuf._cnt = 0;
	while(*str++)
		_strbuf._cnt++;
	_strbuf._bufsiz = _strbuf._cnt;
	return(_doscan(&_strbuf, fmt, args));
}

	What exactly does this do and where do I find _doscan?

	Any hints would be greatly appreciated.  I am trying to
make this code portable.  Thanks in advance.