diff options
| -rw-r--r-- | miscutils/mt.c | 135 |
1 files changed, 79 insertions, 56 deletions
diff --git a/miscutils/mt.c b/miscutils/mt.c index be1f21a12..c16073c61 100644 --- a/miscutils/mt.c +++ b/miscutils/mt.c @@ -6,58 +6,87 @@ #include "libbb.h" #include <sys/mtio.h> -struct mt_opcodes { - const 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} +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, 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) { bb_show_usage(); @@ -72,24 +101,18 @@ int mt_main(int argc, char **argv) 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; + op.mt_op = opcode_value[idx]; if (argc >= 3) op.mt_count = xatoi_u(argv[2]); else op.mt_count = 1; /* One, not zero, right? */ - switch (code->value) { + switch (opcode_value[idx]) { case MTWEOF: case MTERASE: case MTWSM: @@ -104,10 +127,10 @@ int mt_main(int argc, char **argv) fd = xopen(file, mode); - switch (code->value) { + 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); + printf("At block %d\n", (int) position.mt_blkno); break; default: |