-#include "internal.h"
-#include <stdio.h>
-#include <sys/mtio.h>
-#include <sys/fcntl.h>
+/* vi: set sw=4 ts=4: */
+/*
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+//config:config MT
+//config: bool "mt (2.6 kb)"
+//config: default y
+//config: help
+//config: mt is used to control tape devices. You can use the mt utility
+//config: to advance or rewind a tape past a specified number of archive
+//config: files on the tape.
-static const char mt_usage[] = "mt [-f device] opcode value\n";
+//applet:IF_MT(APPLET(mt, BB_DIR_BIN, BB_SUID_DROP))
-struct mt_opcodes {
- char * name;
- short value;
-};
+//kbuild:lib-$(CONFIG_MT) += mt.o
+
+//usage:#define mt_trivial_usage
+//usage: "[-f device] opcode value"
+//usage:#define mt_full_usage "\n\n"
+//usage: "Control magnetic tape drive operation\n"
+//usage: "\n"
+//usage: "Available Opcodes:\n"
+//usage: "\n"
+//usage: "bsf bsfm bsr bss datacompression drvbuffer eof eom erase\n"
+//usage: "fsf fsfm fsr fss load lock mkpart nop offline ras1 ras2\n"
+//usage: "ras3 reset retension rewind rewoffline seek setblk setdensity\n"
+//usage: "setpart tell unload unlock weof wset"
+
+#include "libbb.h"
+#include <sys/mtio.h>
/* 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 },
- { "rew", 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 }
+static const short opcode_value[] = {
+ MTBSF,
+ MTBSFM,
+ MTBSR,
+ MTBSS,
+ MTCOMPRESSION,
+ MTEOM,
+ MTERASE,
+ MTFSF,
+ MTFSFM,
+ MTFSR,
+ MTFSS,
+ MTLOAD,
+ MTLOCK,
+ MTMKPART,
+ MTNOP,
+ MTOFFL,
+ MTOFFL,
+ MTRAS1,
+ MTRAS2,
+ MTRAS3,
+ MTRESET,
+ MTRETEN,
+ MTREW,
+ MTSEEK,
+ MTSETBLK,
+ MTSETDENSITY,
+ MTSETDRVBUFFER,
+ MTSETPART,
+ MTTELL,
+ MTWSM,
+ MTUNLOAD,
+ MTUNLOCK,
+ MTWEOF,
+ MTWEOF
};
-extern int
-mt_main(int argc, char** argv)
+static const char opcode_name[] ALIGN1 =
+ "bsf" "\0"
+ "bsfm" "\0"
+ "bsr" "\0"
+ "bss" "\0"
+ "datacompression" "\0"
+ "eom" "\0"
+ "erase" "\0"
+ "fsf" "\0"
+ "fsfm" "\0"
+ "fsr" "\0"
+ "fss" "\0"
+ "load" "\0"
+ "lock" "\0"
+ "mkpart" "\0"
+ "nop" "\0"
+ "offline" "\0"
+ "rewoffline" "\0"
+ "ras1" "\0"
+ "ras2" "\0"
+ "ras3" "\0"
+ "reset" "\0"
+ "retension" "\0"
+ "rewind" "\0"
+ "seek" "\0"
+ "setblk" "\0"
+ "setdensity" "\0"
+ "drvbuffer" "\0"
+ "setpart" "\0"
+ "tell" "\0"
+ "wset" "\0"
+ "unload" "\0"
+ "unlock" "\0"
+ "eof" "\0"
+ "weof" "\0";
+
+int mt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int mt_main(int argc UNUSED_PARAM, char **argv)
{
- const char * file = "/dev/tape";
- const struct mt_opcodes * code = opcodes;
- struct mtop op;
- int fd;
-
- if ( strcmp(argv[1], "-f") == 0 ) {
- if ( argc < 4 ) {
- usage (mt_usage);
- }
+ const char *file = "/dev/tape";
+ struct mtop op;
+ struct mtpos position;
+ int fd, mode, idx;
+
+ if (!argv[1]) {
+ bb_show_usage();
+ }
+
+ if (strcmp(argv[1], "-f") == 0) {
+ if (!argv[2] || !argv[3])
+ bb_show_usage();
file = argv[2];
argv += 2;
- argc -= 2;
}
- while ( code->name != 0 ) {
- if ( strcmp(code->name, argv[1]) == 0 )
- break;
- code++;
- }
+ idx = index_in_strings(opcode_name, argv[1]);
- if ( code->name == 0 ) {
- fprintf(stderr, "mt: unrecognized opcode %s.\n", argv[1]);
- return( FALSE);
- }
+ if (idx < 0)
+ bb_error_msg_and_die("unrecognized opcode %s", argv[1]);
- op.mt_op = code->value;
- if ( argc >= 3 )
- op.mt_count = atoi(argv[2]);
+ op.mt_op = opcode_value[idx];
+ if (argv[2])
+ op.mt_count = xatoi_positive(argv[2]);
else
- op.mt_count = 1; /* One, not zero, right? */
+ op.mt_count = 1; /* One, not zero, right? */
- if ( (fd = open(file, O_RDONLY, 0)) < 0 ) {
- perror(file);
- return( FALSE);
+ switch (opcode_value[idx]) {
+ case MTWEOF:
+ case MTERASE:
+ case MTWSM:
+ case MTSETDRVBUFFER:
+ mode = O_WRONLY;
+ break;
+
+ default:
+ mode = O_RDONLY;
+ break;
}
- if ( ioctl(fd, MTIOCTOP, &op) != 0 ) {
- perror(file);
- return( FALSE);
+ fd = xopen(file, mode);
+
+ switch (opcode_value[idx]) {
+ case MTTELL:
+ ioctl_or_perror_and_die(fd, MTIOCPOS, &position, "%s", file);
+ printf("At block %d\n", (int) position.mt_blkno);
+ break;
+
+ default:
+ ioctl_or_perror_and_die(fd, MTIOCTOP, &op, "%s", file);
+ break;
}
- return( TRUE);
+ return EXIT_SUCCESS;
}
projects / oweals / busybox.git / blobdiff