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
|
/* vi: set sw=4 ts=4: */
/*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "busybox.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mtio.h>
#include <fcntl.h>
struct mt_opcodes {
char *name;
short value;
};
/* missing: eod/seod, stoptions, stwrthreshold, densities */
static const struct mt_opcodes opcodes[] = {
{"bsf", MTBSF},
{"bsfm", MTBSFM},
{"bsr", MTBSR},
{"bss", MTBSS},
{"datacompression", MTCOMPRESSION},
{"eom", MTEOM},
{"erase", MTERASE},
{"fsf", MTFSF},
{"fsfm", MTFSFM},
{"fsr", MTFSR},
{"fss", MTFSS},
{"load", MTLOAD},
{"lock", MTLOCK},
{"mkpart", MTMKPART},
{"nop", MTNOP},
{"offline", MTOFFL},
{"rewoffline", MTOFFL},
{"ras1", MTRAS1},
{"ras2", MTRAS2},
{"ras3", MTRAS3},
{"reset", MTRESET},
{"retension", MTRETEN},
{"rewind", MTREW},
{"seek", MTSEEK},
{"setblk", MTSETBLK},
{"setdensity", MTSETDENSITY},
{"drvbuffer", MTSETDRVBUFFER},
{"setpart", MTSETPART},
{"tell", MTTELL},
{"wset", MTWSM},
{"unload", MTUNLOAD},
{"unlock", MTUNLOCK},
{"eof", MTWEOF},
{"weof", MTWEOF},
{0, 0}
};
int mt_main(int argc, char **argv)
{
const char *file = "/dev/tape";
const struct mt_opcodes *code = opcodes;
struct mtop op;
struct mtpos position;
int fd, mode;
if (argc < 2) {
bb_show_usage();
}
if (strcmp(argv[1], "-f") == 0) {
if (argc < 4) {
bb_show_usage();
}
file = argv[2];
argv += 2;
argc -= 2;
}
while (code->name != 0) {
if (strcmp(code->name, argv[1]) == 0)
break;
code++;
}
if (code->name == 0) {
bb_error_msg("unrecognized opcode %s.", argv[1]);
return EXIT_FAILURE;
}
op.mt_op = code->value;
if (argc >= 3)
op.mt_count = atoi(argv[2]);
else
op.mt_count = 1; /* One, not zero, right? */
switch (code->value) {
case MTWEOF:
case MTERASE:
case MTWSM:
case MTSETDRVBUFFER:
mode = O_WRONLY;
break;
default:
mode = O_RDONLY;
break;
}
fd = bb_xopen3(file, mode, 0);
switch (code->value) {
case MTTELL:
if (ioctl(fd, MTIOCPOS, &position) < 0)
bb_perror_msg_and_die("%s", file);
printf ("At block %d.\n", (int) position.mt_blkno);
break;
default:
if (ioctl(fd, MTIOCTOP, &op) != 0)
bb_perror_msg_and_die("%s", file);
break;
}
return EXIT_SUCCESS;
}
|
