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From: ted@arsocomvax.socom.mil (Ted Nolan)
Newsgroups: comp.os.msdos.programmer
Subject: Re: Number of drives on system, how do you find out the ...
Keywords: MS-DOS, drives
Message-ID: <1990Oct22.152951.24125@usasoc.soc.mil>
Date: 22 Oct 90 15:29:51 GMT
References: <1085@duteca4.UUCP> <25000@uflorida.cis.ufl.EDU>
Reply-To: ted@usasoc.soc.mil (Ted Nolan)
Distribution: usa
Organization: SRI International
Lines: 42

Here's a little program we use from batch files to see if a drive is
valid; with a little modification, it should do what you want.  It
works with MIX C, and presumably with turbo and msc.  It stats a file on
a disk and sees if you would have gotten "abort,retry,ignore".


				Ted Nolan
				ted@usasoc.soc.mil

---------------------------------------CUT HERE-------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <dos.h>
#include <sys\stat.h>

int dstatus = 0;

main(int argc, char **argv)
{
	int harderror(int error, int ax, int bp, int si);
	char path[15];
	struct stat statbuf;

	if( argc != 2) {
		fprintf(stderr,"Usage %s  d\n",argv[0]);
		fprintf(stderr,"Where d is a drive letter\n");
		exit(1);
	}

	sprintf(path,"%s:\\foo\\bar",argv[1]);

	harderr(harderror);
	(void) stat(path,&statbuf);

	exit(dstatus);
}

int harderror(int error, int ax, int bp, int si)
{
	dstatus = 1;
	hardresume(0);
}