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Microsoft OS/2 SDK 03-01-1988

/***
 *	Example of DosQFSInfo and DosSetFSInfo. Also DosError.
 *
 *	First do a DosQFSInfo level 1 to get the A drive
 *	parameters, then a DosQFSInfo level 2 to check the volume
 *	label of the A drive. Next do a DosSetFSInfo to
 *	change the volume label to FSIDEMO, and lastly another
 *	DosQFSInfo level 2 to verify the set.
 *
 *	Created by Microsoft Corp. 1988
 */

#define INCL_DOSFILEMGR
#define INCL_DOSMISC

#include <os2def.h>
#include <bse.h>

#define FSIBUF	40

USHORT drive;			/* drive number */
unsigned retcode;		/* return code from call */
unsigned testbufsiz;		/* length of volume label to set */
int *date_time;			/* date and time returned by level 2 query */
char setlabel[] = "\007FSIDEMO";    /* buffer for DosSetFSInfo */
				    /* starts with byte of string length */

/* FSInfoBuf level 1 */
FSALLOCATE fsinfobuf;

/*	the level 2 FSInfoBuf buffer contains
 *		2 bytes - volume label date of creation
 *		2 bytes - volume label time of creation
 *		1 byte - length of volume label
 *		'n' bytes - the volume label string
 */

char buffer[FSIBUF];		/* buffer for DosQFSInfo, level 2 */

main()
{
	USHORT level;
	drive = 1;			/* A drive */

	/* turn off hard errors so we see if user has drive A open */
	DosError(0);

	/* check the parameters of the A drive using DosQFSInfo level 1 */
	level = 1;
	retcode = DosQFSInfo( drive, level, (PBYTE)&fsinfobuf, FSIBUF);

	if ( retcode )
		printf("Received error %d from DosQFSInfo\n", retcode);
	else {
		printf("DosQFSInfo provided the following information:\n");
		printf("   File System ID - %ld\n", fsinfobuf.idFileSystem);
		printf("   Sectors per allocation unit - %ld\n",
		    fsinfobuf.cSectorUnit);
		printf("   Number of allocation units - %ld\n",
		    fsinfobuf.cUnit);
		printf("   Available allocation units - %ld\n",
		    fsinfobuf.cUnitAvail);
		printf("   Bytes per sector - %d\n\n",
		    fsinfobuf.cbSector);
	}

	/* check for a volume label on the A drive using DosQFSInfo
	 * level 2.  Access the data in the buffer as follows:
	 *	time - first pair of bytes in the buffer (date_time[0])
	 *	date - second pair of bytes in the buffer (date_time[1])
	 *	label length - resides at buffer[4], 4 bytes into buffer
	 *	label - string starts at the fifth byte of the buffer
	 */

	level = 2;
	retcode = DosQFSInfo( drive, level, (PBYTE)buffer, FSIBUF);

	date_time = (int *)buffer;	/* pointer into time/date info */
	if ( !retcode ) {		/* got volume label */
		printf("DosQFSInfo found volume label %s on drive %d\n",
		    buffer+5, drive );
		printf("   label length %d, date 0x%x, time 0x%x\n\n", 
		    buffer[4], date_time[0], date_time[1] );
	}
	else if ( retcode == 125 )
		printf("No volume label found by DosQFSInfo on drive %d\n\n",
		    drive );
	else
		printf("DosQFSInfo call failed with error %d\n\n", retcode );

	/* do a DosSetFSInfo, changing the volume label to FSIDEMO  */
	testbufsiz = strlen( setlabel );

	retcode = DosSetFSInfo( drive, level, setlabel, testbufsiz);

	if ( retcode )
		printf("Error %d setting volume label to %s on drive %d\n\n", 
		       retcode, setlabel, drive);
	else {
		printf("DosSetFSInfo set volume label %s\n", setlabel+1);

		/* do a DosQFSInfo to verify the set */
		DosQFSInfo( drive, level, (PBYTE)buffer, FSIBUF);
		printf("DosQFSInfo found label %s\n", buffer+5);
	}
}

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