hush/miscutils/mt.c
Bernhard Reutner-Fischer 64d7e93081 - convert a few xopen3(,,0) into xopen(,). Also peruse the fact that xopen defaults to 0777 on it's own, so we don't need to xopen3(,,0777).
Saves a few bytes:
$ size busybox.old busybox                                text    data     bss     dec     hex filename
 839676    8780  243592 1092048  10a9d0 busybox.old
 839660    8780  243592 1092032  10a9c0 busybox
$ make CC=gcc-4.2-HEAD bloatcheck
function                                             old     new   delta
static.vconfig_main                                  281     279      -2
static.rx_main                                      1076    1074      -2
static.mt_main                                       294     292      -2
static.gzip_main                                     753     751      -2
static.mkfs_minix_main                              4034    4030      -4
static.unzip_main                                   1771    1766      -5
static.crontab_main                                 1513    1507      -6
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/7 up/down: 0/-23)             Total: -23 bytes
2006-09-11 16:01:40 +00:00

121 lines
2.1 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "busybox.h"
#include <sys/mtio.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 = xopen(file, mode);
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;
}