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Path: utzoo!watmath!wateng!broehl
From: broehl@wateng.UUCP (Bernie Roehl)
Newsgroups: net.micro.pc
Subject: Re: WANTED -- DeSmet C Help.
Message-ID: <1148@wateng.UUCP>
Date: Fri, 29-Jun-84 09:35:03 EDT
Article-I.D.: wateng.1148
Posted: Fri Jun 29 09:35:03 1984
Date-Received: Sun, 1-Jul-84 01:54:28 EDT
References: <1338@ucf-cs.UUCP>
Organization: U of Waterloo, Ontario
Lines: 47

Yes, you can do the equivalent of a stat() on files from DeSmet.
There are various approaches, depending on what information you need.

The following is one possible approach:
		struct
			{
			char reserved[21];
			char attr;
			unsigned ftime;
			unsigned fdate;
			long fsize;
			char fname[13];
			} dta;

		_os(0x1A, dta);	/* set up the disk transfer area */
		_os(0x4E, "frodo.txt");

The second _os() call does a "Find First", which fills the dta with infor-
mation about the first file matching the pattern given by the string.
(Yes, you can use wildcard characters).  Subsequent _os() calls using 4F
instead of 4E will return info about additional files matching the pattern.

HOWEVER, the use of _os() for this is tricky, since the DOS 2.00 manual says
(on page D-49, under the 0x4E call description) that CX contains an attribute
byte, and that only files mathcing that attribute will be found.  Thus a
safer way of doing it is to replace the second _os() call above with the
following:

		_rax = 0x4F00;
		_rcx = 0x0010;/* the 1-bit indicates directories are ok too */
		_rdx = "frodo.txt";
		_rds = _showds();
		_doint(0x21);	/* invoke DOS */

This requires (a) that you have release 2.3 (2.2?) or above of DeSmet (i.e.
that you have the _doint() function, and (b) that you have previously
declared the following:

		extern unsigned _rax, _rcx, _rdx, _rds;

The variable _carryf can be used to determine if there were any problems.
Have fun!
			

-- 
        -Bernie Roehl    (University of Waterloo)
	...decvax!allegra!watmath!watrose!wateng!broehl