X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=miscutils%2Fmt.c;h=2720f7eab8057cd8434e076c87a006c78118f0f8;hb=eea561871b45a2335ab6a09f14dad627ffcdc1cd;hp=cf20d1711bbf11d695cc31bfeadaf4cc66b81d1e;hpb=5e1189e187f6a7957dadb8eda2c271c4a0777a23;p=oweals%2Fbusybox.git

diff --git a/miscutils/mt.c b/miscutils/mt.c
index cf20d1711..2720f7eab 100644
--- a/miscutils/mt.c
+++ b/miscutils/mt.c
@@ -1,11 +1,14 @@
 /* vi: set sw=4 ts=4: */
-#include "internal.h"
+/*
+ * 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 <sys/fcntl.h>
-
-static const char mt_usage[] = "mt [-f device] opcode value\n\n"
-			"Control magnetic tape drive operation\n";
+#include <fcntl.h>
 
 struct mt_opcodes {
 	char *name;
@@ -36,7 +39,7 @@ static const struct mt_opcodes opcodes[] = {
 	{"ras3", MTRAS3},
 	{"reset", MTRESET},
 	{"retension", MTRETEN},
-	{"rew", MTREW},
+	{"rewind", MTREW},
 	{"seek", MTSEEK},
 	{"setblk", MTSETBLK},
 	{"setdensity", MTSETDENSITY},
@@ -51,20 +54,21 @@ static const struct mt_opcodes opcodes[] = {
 	{0, 0}
 };
 
-extern int mt_main(int argc, char **argv)
+int mt_main(int argc, char **argv)
 {
 	const char *file = "/dev/tape";
 	const struct mt_opcodes *code = opcodes;
 	struct mtop op;
-	int fd;
-	
-	if ((argc != 2 && argc != 3) || **(argv + 1) == '-') {
-		usage(mt_usage);
+	struct mtpos position;
+	int fd, mode;
+
+	if (argc < 2) {
+		bb_show_usage();
 	}
 
 	if (strcmp(argv[1], "-f") == 0) {
 		if (argc < 4) {
-			usage(mt_usage);
+			bb_show_usage();
 		}
 		file = argv[2];
 		argv += 2;
@@ -78,8 +82,8 @@ extern int mt_main(int argc, char **argv)
 	}
 
 	if (code->name == 0) {
-		fprintf(stderr, "mt: unrecognized opcode %s.\n", argv[1]);
-		exit (FALSE);
+		bb_error_msg("unrecognized opcode %s.", argv[1]);
+		return EXIT_FAILURE;
 	}
 
 	op.mt_op = code->value;
@@ -88,15 +92,33 @@ extern int mt_main(int argc, char **argv)
 	else
 		op.mt_count = 1;		/* One, not zero, right? */
 
-	if ((fd = open(file, O_RDONLY, 0)) < 0) {
-		perror(file);
-		exit (FALSE);
+	switch (code->value) {
+		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);
-		exit (FALSE);
+	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;
 	}
 
-	exit (TRUE);
+	return EXIT_SUCCESS;
 }