File: savetab.c

package info (click to toggle)
atari-fdisk 0.7.1-1
  • links: PTS
  • area: main
  • in suites: slink
  • size: 236 kB
  • ctags: 225
  • sloc: ansic: 2,946; makefile: 136; sh: 23
file content (189 lines) | stat: -rw-r--r-- 4,484 bytes parent folder | download | duplicates (7)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
/* 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:             */