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/*
** DRVS.C - public domain by David Gersic, DeKalb, Il 1993
**
** Routine checks how many valid disk drives are available on machine,
** both physical and logical drives.
**
** Includes drive letters assigned with DOS SUBST command and network
** drives for Novell Netware (and probably other networks).
**
** Compiled Under MSC 6 LARGE memory Model
** Should be compatible with other DOS compilers
**
*/
#include <stdio.h>
#include <dos.h>
#include <stdlib.h>
main()
{
union REGS in, out;
int i;
/* Novell's shell TSRs allow up to 32 drive 'letters' to be created */
char drives[]={' ','a','b','c','d','e','f','g','h','i','j',
'k','l','m','n','o','p','q','r','s','t','u',
'v','w','x','y','z','[','\\',']','^','_','`'};
in.x.ax=0x4409; /* IOCTL function - Check if block device remote */
for(i = 1; i < 32; i++)
{
in.h.bl=(unsigned char)i; /* 1==a:, 2==b:, etc. */
intdos(&in,&out);
if(!out.x.cflag) /* carry flag set on error */
{ /* bit 15 == subst, bit 12 == 'remote'*/
printf("drive %c: is %s\n",
drives[i],out.x.dx & 1<<15 ? "subst" :
out.x.dx & 1<<12 ? "network" : "local");
}
}
return(0);
}
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