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From: tjones@killer.UUCP (Tim Jones)
Newsgroups: comp.lang.c
Subject: Volume labels again
Message-ID: <1325@killer.UUCP>
Date: Tue, 11-Aug-87 22:45:31 EDT
Article-I.D.: killer.1325
Posted: Tue Aug 11 22:45:31 1987
Date-Received: Sat, 15-Aug-87 03:28:07 EDT
Organization: The Unix(tm) Connection, Dallas, Texas
Lines: 17

Well, I received a request for the solution I discovered about reading volume
labels from C/Assembly, so here it is:

Set the DTA to a 64 byte buffer.

Define an XFCB in the sequence as follows:
     0ffh     ;sifnifies XFCB
     5 zeroes(0)     ;reserved space
     8     ;attribute for volume label
     0     ;default drive
     11 question marks (?)    ;wildcard filename/extension
     25 zeros(0)    ;space not used

Call interrupt function 11h - if al = offh, no label, else the 64 byte buffer
contains the name in bytes 8h-12h

By the way, the preceding came from Advanced MS-DOS from Microsoft Press.