mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-11-24 04:09:43 +00:00
64d7e93081
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
121 lines
2.1 KiB
C
121 lines
2.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "busybox.h"
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#include <sys/mtio.h>
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struct mt_opcodes {
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char *name;
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short value;
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};
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/* missing: eod/seod, stoptions, stwrthreshold, densities */
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static const struct mt_opcodes opcodes[] = {
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{"bsf", MTBSF},
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{"bsfm", MTBSFM},
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{"bsr", MTBSR},
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{"bss", MTBSS},
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{"datacompression", MTCOMPRESSION},
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{"eom", MTEOM},
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{"erase", MTERASE},
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{"fsf", MTFSF},
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{"fsfm", MTFSFM},
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{"fsr", MTFSR},
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{"fss", MTFSS},
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{"load", MTLOAD},
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{"lock", MTLOCK},
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{"mkpart", MTMKPART},
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{"nop", MTNOP},
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{"offline", MTOFFL},
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{"rewoffline", MTOFFL},
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{"ras1", MTRAS1},
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{"ras2", MTRAS2},
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{"ras3", MTRAS3},
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{"reset", MTRESET},
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{"retension", MTRETEN},
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{"rewind", MTREW},
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{"seek", MTSEEK},
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{"setblk", MTSETBLK},
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{"setdensity", MTSETDENSITY},
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{"drvbuffer", MTSETDRVBUFFER},
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{"setpart", MTSETPART},
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{"tell", MTTELL},
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{"wset", MTWSM},
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{"unload", MTUNLOAD},
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{"unlock", MTUNLOCK},
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{"eof", MTWEOF},
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{"weof", MTWEOF},
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{0, 0}
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};
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int mt_main(int argc, char **argv)
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{
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const char *file = "/dev/tape";
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const struct mt_opcodes *code = opcodes;
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struct mtop op;
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struct mtpos position;
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int fd, mode;
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if (argc < 2) {
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bb_show_usage();
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}
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if (strcmp(argv[1], "-f") == 0) {
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if (argc < 4) {
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bb_show_usage();
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}
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file = argv[2];
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argv += 2;
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argc -= 2;
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}
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while (code->name != 0) {
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if (strcmp(code->name, argv[1]) == 0)
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break;
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code++;
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}
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if (code->name == 0) {
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bb_error_msg("unrecognized opcode %s.", argv[1]);
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return EXIT_FAILURE;
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}
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op.mt_op = code->value;
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if (argc >= 3)
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op.mt_count = atoi(argv[2]);
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else
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op.mt_count = 1; /* One, not zero, right? */
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switch (code->value) {
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case MTWEOF:
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case MTERASE:
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case MTWSM:
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case MTSETDRVBUFFER:
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mode = O_WRONLY;
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break;
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default:
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mode = O_RDONLY;
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break;
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}
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fd = xopen(file, mode);
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switch (code->value) {
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case MTTELL:
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if (ioctl(fd, MTIOCPOS, &position) < 0)
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bb_perror_msg_and_die("%s", file);
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printf ("At block %d.\n", (int) position.mt_blkno);
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break;
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default:
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if (ioctl(fd, MTIOCTOP, &op) != 0)
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bb_perror_msg_and_die("%s", file);
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break;
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}
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return EXIT_SUCCESS;
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}
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