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DISK_SN.C
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C/C++ Source or Header
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1996-11-24
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/* +++Date last modified: 28-Sep-1996 */
/*
** DISK_SN.C - Retrieve a disk serial number
**
** public domain demo by Paul Schlyter and Bob Stout
** OS/2 compatibility added by Mark Kimes
*/
#include <stdio.h>
#ifdef OS2
#define INCL_DOS
#include <os2.h>
#include <stdlib.h>
#else
#include <dos.h>
#endif
#include "extkword.h"
#include "disk_sn.h"
#include "mk_fp.h"
/*
** Arguments: 1 - Drive (0 = default, 1 = A:, 2 = B:, etc.)
**
** Returns: Static string containing the disk serial number, or
** an empty string if no serial number is available,
**
** Notes: Drive errors result in an empty string returned, this function
** does not invoke the critical error handler.
*/
char *get_disk_id(int drive)
{
static char serial_no[10];
#ifndef OS2
union REGS r;
struct SREGS s;
unsigned sno1, sno2;
r.x.ax = 0x6900;
r.h.bl = drive;
segread(&s);
intdosx(&r, &r, &s);
if (r.x.cflag)
*serial_no = '\0';
else
{
sno2 = *((unsigned FAR *)MK_FP(s.ds, r.x.dx+2));
sno1 = *((unsigned FAR *)MK_FP(s.ds, r.x.dx+4));
sprintf(serial_no, "%04X-%04X\n", sno1, sno2);
}
#else
struct {
ULONG serial;
char volumelength;
char volumelabel[CCHMAXPATH];
} volser;
DosError(FERR_DISABLEHARDERR);
if(0 == DosQueryFSInfo(drive, FSIL_VOLSER, &volser, sizeof(volser)))
sprintf(serial_no, "%04X-%04X", HIUSHORT(volser.serial),
LOUSHORT(volser.serial));
else *serial_no = 0;
#endif
return serial_no;
}
#ifdef TEST
#include <ctype.h>
main(int argc, char *argv[])
{
char *sn;
if (2 > argc)
{
puts("Usage: DISK_SN drive_letter [...drive_letter]");
return -1;
}
while (--argc)
{
int drive;
drive = toupper(**++argv);
sn = get_disk_id(drive - '@');
printf("The serial number of %c: is %s\n", drive, sn);
}
return 0;
}
#endif /* TEST */