X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=miscutils%2Fmt.c;h=fad656e956b448e89c1ed04950ae050dedca0699;hb=d72e804e6db1bd6eb2417961004b4fe33aba9384;hp=f4a3be739d3a4ca0c27e516a70f812c78ecc2e49;hpb=64d7e93081141cb6f1668436a5629a2304047f38;p=oweals%2Fbusybox.git

diff --git a/miscutils/mt.c b/miscutils/mt.c
index f4a3be739..fad656e95 100644
--- a/miscutils/mt.c
+++ b/miscutils/mt.c
@@ -1,94 +1,139 @@
 /* vi: set sw=4 ts=4: */
 /*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * 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.
 
-#include "busybox.h"
-#include <sys/mtio.h>
+//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},
-	{"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}
+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
 };
 
-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;
 	struct mtpos position;
-	int fd, mode;
+	int fd, mode, idx;
 
-	if (argc < 2) {
+	if (!argv[1]) {
 		bb_show_usage();
 	}
 
 	if (strcmp(argv[1], "-f") == 0) {
-		if (argc < 4) {
+		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) {
-		bb_error_msg("unrecognized opcode %s.", argv[1]);
-		return EXIT_FAILURE;
-	}
+	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? */
 
-	switch (code->value) {
+	switch (opcode_value[idx]) {
 		case MTWEOF:
 		case MTERASE:
 		case MTWSM:
@@ -103,16 +148,14 @@ int mt_main(int argc, char **argv)
 
 	fd = xopen(file, mode);
 
-	switch (code->value) {
+	switch (opcode_value[idx]) {
 		case MTTELL:
-			if (ioctl(fd, MTIOCPOS, &position) < 0)
-				bb_perror_msg_and_die("%s", file);
-			printf ("At block %d.\n", (int) position.mt_blkno);
+			ioctl_or_perror_and_die(fd, MTIOCPOS, &position, "%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);
+			ioctl_or_perror_and_die(fd, MTIOCTOP, &op, "%s", file);
 			break;
 	}