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/* savetab.c: saving and restoring the partition table
*
* Copyright (C) 1995-97 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
* 1996-97 Michael Schlueter <schlue00@marvin.informatik.uni-dortmund.de>
*
* This program is free software. You can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation: either version 2 or
* (at your option) any later version.
*
*/
/* $Id: savetab.c,v 1.3 1997/06/22 10:30:57 rnhodek Exp $
*
* $Log: savetab.c,v $
* Revision 1.3 1997/06/22 10:30:57 rnhodek
* Add __attribute__((unused)) to cvid
*
* Revision 1.2 1997/06/21 20:47:50 rnhodek
* Added RCS keywords
*
* Revision 1.1 1997/06/11 14:36:36 rnhodek
* Initial revision
*
* Revision 1.1.1.1 1997/06/11 14:36:36 rnhodek
* Started using CVS for atafdisk
*
*/
#ifndef lint
static char vcid[] __attribute__ ((unused)) =
"$Id: savetab.c,v 1.3 1997/06/22 10:30:57 rnhodek Exp $";
#endif /* lint */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include "fdisk.h"
#include "disk.h"
#include "writepart.h"
/***************************** Prototypes *****************************/
static void ulong_to_chars( unsigned long u, char *uu );
static unsigned long chars_to_ulong( unsigned char *uu );
static int save_one_sector( unsigned long secnum, int fdout );
/************************* End of Prototypes **************************/
static void ulong_to_chars( unsigned long u, char *uu )
{
int i;
for( i = 0; i < 4; i++ ) {
uu[i] = (u & 0xff);
u >>= 8;
}
}
static unsigned long chars_to_ulong( unsigned char *uu )
{
int i;
unsigned long u = 0;
for( i=3; i >= 0; i-- )
u = (u << 8) | uu[i];
return u;
}
static int save_one_sector( unsigned long secnum, int fdout )
{
char ss[516];
ulong_to_chars( secnum, ss );
if (!sseek( fd, secnum ))
return 0;
if (read( fd, ss+4, SECTOR_SIZE) != SECTOR_SIZE) {
perror("read");
fprintf( stderr, "read error on sector %lu\n", secnum );
return 0;
}
if (write( fdout, ss, sizeof(ss)) != sizeof(ss)) {
perror("write");
fprintf( stderr, "write error on %s\n", save_sector_file );
return 0;
}
return 1;
}
int save_sectors( void )
{
int fdout, i;
fdout = open(save_sector_file, O_WRONLY | O_CREAT, 0444);
if (fdout < 0) {
perror(save_sector_file);
fprintf( stderr, "cannot open partition sector save file (%s)\n",
save_sector_file );
return 0;
}
/* sector 0 always contains precious data */
if (!save_one_sector( 0, fdout )) goto err;
for( i = 0; i < partitions; ++i ) {
if (IS_EXTENDED(part_table[i]))
if (!save_one_sector( part_table[i].rootsec, fdout ))
goto err;
}
close( fdout );
return 1;
err:
close( fdout );
fprintf( stderr, "saving failed!\n" );
return 0;
}
int restore_sectors( const char *dev )
{
int fdin, fdout, ct;
struct stat statbuf;
char *ss0, *ss;
unsigned long sno;
if (stat( restore_sector_file, &statbuf ) < 0) {
perror( restore_sector_file );
fprintf( stderr, "cannot stat partition restore file (%s)\n",
restore_sector_file );
return 0;
}
if (statbuf.st_size % 516) {
fprintf( stderr, "partition restore file has wrong size - "
"not restoring\n" );
return 0;
}
if (!(ss = (char *)malloc( statbuf.st_size ))) {
fprintf( stderr, "out of memory?\n" );
return 0;
}
if ((fdin = open( restore_sector_file, O_RDONLY )) < 0) {
perror( restore_sector_file );
fprintf( stderr, "cannot open partition restore file (%s)\n",
restore_sector_file );
return 0;
}
if (read( fdin, ss, statbuf.st_size ) != statbuf.st_size) {
perror( "read" );
fprintf( stderr, "error reading %s\n", restore_sector_file );
return 0;
}
close( fdin );
fdout = open( dev, O_WRONLY );
if (fdout < 0) {
perror( dev );
fprintf( stderr, "cannot open device %s for writing\n", dev );
return 0;
}
ss0 = ss;
ct = statbuf.st_size/516;
while( ct-- ) {
sno = chars_to_ulong( ss );
if (!dangerous_write( fdout, ss+4, sno )) {
perror( dev );
fprintf( stderr, "error writing sector %lu on %s\n", sno, dev );
return 0;
}
ss += 516;
}
free(ss0);
reread_disk_partition( fdout );
close( fdout );
return 1;
}
/* Local Variables: */
/* tab-width: 8 */
/* End: */
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