1 files changed, 140 insertions, 0 deletions
diff --git a/miscutils/mt.c b/miscutils/mt.c
new file mode 100644
index 0000000..586373d
--- /dev/null
+++ b/miscutils/mt.c
@@ -0,0 +1,140 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+#include <sys/mtio.h>
+
+/* missing: eod/seod, stoptions, stwrthreshold, densities */
+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
+};
+
+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";
+	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;
+	}
+
+	idx = index_in_strings(opcode_name, argv[1]);
+
+	if (idx < 0)
+		bb_error_msg_and_die("unrecognized opcode %s", argv[1]);
+
+	op.mt_op = opcode_value[idx];
+	if (argv[2])
+		op.mt_count = xatoi_u(argv[2]);
+	else
+		op.mt_count = 1;		/* One, not zero, right? */
+
+	switch (opcode_value[idx]) {
+		case MTWEOF:
+		case MTERASE:
+		case MTWSM:
+		case MTSETDRVBUFFER:
+			mode = O_WRONLY;
+			break;
+
+		default:
+			mode = O_RDONLY;
+			break;
+	}
+
+	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 EXIT_SUCCESS;
+}