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From: TEMARI%ECAMV1.dnet.ge.com@vm1.nodak.edu
Newsgroups: comp.os.minix
Subject: (none)
Message-ID: <45311@nigel.ee.udel.edu>
Date: 21 Feb 91 01:32:19 GMT
Sender: mmdf@ee.udel.edu
Lines: 129

Here are two programs that I wrote a while back for reading and writing of
files to disk drives directly.  They were compiled with turboC.
I have no utilities with we right now so they are not encoded.
They work by reading(rdisk) or writing(wdisk) from/to disk to/from
file.  They do this by calling the bios to read/write a sector at a time.
I wrote these quickly when I had to convert 1.2 floppys to 1.44.
They could be changed to write by tracks but there are some problems
to overcome with other bios.



WARNING: wdisk only allows you to write to drive 0 (A:) and if changed
         to allow writing anywhere be cautious when using your hard
         drives (drive 128) because the program will write over them.


Hope these help


Michael Temari                temari@ecamv1.dnet.get.com
-----------------------------------------------------------------------------
/* wdisk.c by Michael Temari    temari@ecamv1.dnet.ge.com */

#include <stdio.h>
#include <stdlib.h>
#include <bios.h>

void    main(argc,argv)
int     argc;
char    *argv[];
{
FILE    *fpin;
char    buffer[512];
int     drive,spt,tracks,sector,track,side,status,i;

        if(argc!=5) {
                printf("usage is: %s in_file drive sec/trac tracks\n",argv[0]);
                exit(1);
        }
        if((fpin=fopen(argv[1],"rb")) == NULL) {
                printf("error: could not open %s\n",argv[1]);
                exit(1);
        }
        drive = atoi(argv[2]);
        if(drive!=0) {
                printf("\nDrive 0 is the only valid drive!\n");
                exit(1);
        }
        spt = atoi(argv[3]);
        tracks = atoi(argv[4]);
        printf("Drive:%d\nSectors per Track:%d\nTracks:%d\n",drive,spt,tracks);
        for(track=0;track<tracks;track++)
           for(side=0;side<2;side++)
              for(sector=1;sector<=spt;sector++) {
                printf("Side:%d Track:%2d Sector: %2d",side,track,sector);
                for(i=0;i<27;i++)
                        printf("\x8");
                if(fread(buffer,1,512,fpin)!=512) {
                        printf("\n\nerror: reading from file %s\n",argv[1]);
                        exit(1);
                        }
                status = biosdisk(3,drive,side,track,sector,1,&buffer);
                if(status!=0) {
                        printf("\nError Writing Sector!!!  Status:
 %d\n\n",status);
                        exit(1);
                }
              }
        printf("\n\n");
        if(fclose(fpin)) {
                printf("error: could not close %s\n",argv[2]);
                exit(1);
        }
}
------------------------------------------------------------------------------
/* rdisk.c by Michael Temari    temari@ecamv1.dnet.ge.com */

#include <stdio.h>
#include <stdlib.h>
#include <bios.h>

void    main(argc,argv)
int     argc;
char    *argv[];
{
FILE    *fpout;
char    buffer[512];
int     drive,spt,tracks,sides,sector,track,side,status,i;

        if((argc!=5)&&(argc!=6)) {
                printf("usage is: %s out_file drive sec/trac tracks
 [sides]\n",argv[0]);
                exit(1);
        }
        if((fpout=fopen(argv[1],"wb")) == NULL) {
                printf("error: could not open %s\n",argv[1]);
                exit(1);
        }
        drive = atoi(argv[2]);
        spt = atoi(argv[3]);
        tracks = atoi(argv[4]);
        if(argc==5)
                sides=2;
        else
                sides=atoi(argv[5]);
        printf("Drive:%d\nSectors per Track:%d\nTracks:%d\n",drive,spt,tracks);
        for(track=0;track<tracks;track++)
           for(side=0;side<sides;side++)
              for(sector=1;sector<=spt;sector++) {
                printf("Side:%d Track:%2d Sector: %2d",side,track,sector);
                for(i=0;i<27;i++)
                        printf("\x8");
                status = biosdisk(2,drive,side,track,sector,1,&buffer);
                if(status!=0)
                        printf("\nError Reading Sector!!!  Status:
 %d\n\n",status);
                else
                        if(fwrite(buffer,1,512,fpout)!=512) {
                                printf("error: writing to file %s\n",argv[1]);
                                exit(1);
                        }
              }
        printf("\n\n");
        if(fclose(fpout)) {
                printf("error: could not close %s\n",argv[2]);
                exit(1);
        }
}
-----------------------------------------------------------------------------