diff options
Diffstat (limited to 'coreutils/dd.c')
| -rw-r--r-- | coreutils/dd.c | 146 |
1 files changed, 86 insertions, 60 deletions
diff --git a/coreutils/dd.c b/coreutils/dd.c index f3330e6..e172b0c 100644 --- a/coreutils/dd.c +++ b/coreutils/dd.c @@ -79,23 +79,31 @@ static bool write_and_stats(const void *buf, size_t len, size_t obs, #endif int dd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; -int dd_main(int argc, char **argv) +int dd_main(int argc ATTRIBUTE_UNUSED, char **argv) { enum { - FLAG_SYNC = 1 << 0, - FLAG_NOERROR = 1 << 1, - FLAG_NOTRUNC = 1 << 2, - FLAG_TWOBUFS = 1 << 3, - FLAG_COUNT = 1 << 4, + /* Must be in the same order as OP_conv_XXX! */ + /* (see "flags |= (1 << what)" below) */ + FLAG_NOTRUNC = 1 << 0, + FLAG_SYNC = 1 << 1, + FLAG_NOERROR = 1 << 2, + FLAG_FSYNC = 1 << 3, + /* end of conv flags */ + FLAG_TWOBUFS = 1 << 4, + FLAG_COUNT = 1 << 5, }; static const char keywords[] ALIGN1 = "bs=\0""count=\0""seek=\0""skip=\0""if=\0""of=\0" #if ENABLE_FEATURE_DD_IBS_OBS - "ibs=\0""obs=\0""conv=\0""notrunc\0""sync\0""noerror\0" + "ibs=\0""obs=\0""conv=\0" #endif ; +#if ENABLE_FEATURE_DD_IBS_OBS + static const char conv_words[] ALIGN1 = + "notrunc\0""sync\0""noerror\0""fsync\0"; +#endif enum { - OP_bs = 1, + OP_bs = 0, OP_count, OP_seek, OP_skip, @@ -105,9 +113,23 @@ int dd_main(int argc, char **argv) OP_ibs, OP_obs, OP_conv, - OP_conv_notrunc, + /* Must be in the same order as FLAG_XXX! */ + OP_conv_notrunc = 0, OP_conv_sync, OP_conv_noerror, + OP_conv_fsync, + /* Unimplemented conv=XXX: */ + //nocreat do not create the output file + //excl fail if the output file already exists + //fdatasync physically write output file data before finishing + //swab swap every pair of input bytes + //lcase change upper case to lower case + //ucase change lower case to upper case + //block pad newline-terminated records with spaces to cbs-size + //unblock replace trailing spaces in cbs-size records with newline + //ascii from EBCDIC to ASCII + //ebcdic from ASCII to EBCDIC + //ibm from ASCII to alternate EBCDIC #endif }; int exitcode = EXIT_FAILURE; @@ -138,85 +160,85 @@ int dd_main(int argc, char **argv) signal_SA_RESTART_empty_mask(SIGUSR1, dd_output_status); #endif - for (n = 1; n < argc; n++) { - smalluint key_len; - smalluint what; - char *key; + for (n = 1; argv[n]; n++) { + int what; + char *val; char *arg = argv[n]; -//XXX:FIXME: we reject plain "dd --" This would cost ~20 bytes, so.. -//if (*arg == '-' && *++arg == '-' && !*++arg) continue; - key = strstr(arg, "="); - if (key == NULL) +#if ENABLE_DESKTOP + /* "dd --". NB: coreutils 6.9 will complain if they see + * more than one of them. We wouldn't. */ + if (arg[0] == '-' && arg[1] == '-' && arg[2] == '\0') + continue; +#endif + val = strchr(arg, '='); + if (val == NULL) bb_show_usage(); - key_len = key - arg + 1; - key = xstrndup(arg, key_len); - what = index_in_strings(keywords, key) + 1; - if (ENABLE_FEATURE_CLEAN_UP) - free(key); - if (what == 0) + *val = '\0'; + what = index_in_strings(keywords, arg); + if (what < 0) bb_show_usage(); - arg += key_len; + /* *val = '='; - to preserve ps listing? */ + val++; #if ENABLE_FEATURE_DD_IBS_OBS if (what == OP_ibs) { /* Must fit into positive ssize_t */ - ibs = xatoul_range_sfx(arg, 1, ((size_t)-1L)/2, dd_suffixes); - continue; + ibs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, dd_suffixes); + /*continue;*/ } if (what == OP_obs) { - obs = xatoul_range_sfx(arg, 1, ((size_t)-1L)/2, dd_suffixes); - continue; + obs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, dd_suffixes); + /*continue;*/ } if (what == OP_conv) { while (1) { - /* find ',', replace them with NUL so we can use arg for + /* find ',', replace them with NUL so we can use val for * index_in_strings() without copying. - * We rely on arg being non-null, else strchr would fault. + * We rely on val being non-null, else strchr would fault. */ - key = strchr(arg, ','); - if (key) - *key = '\0'; - what = index_in_strings(keywords, arg) + 1; - if (what < OP_conv_notrunc) - bb_error_msg_and_die(bb_msg_invalid_arg, arg, "conv"); - if (what == OP_conv_notrunc) - flags |= FLAG_NOTRUNC; - if (what == OP_conv_sync) - flags |= FLAG_SYNC; - if (what == OP_conv_noerror) - flags |= FLAG_NOERROR; - if (!key) /* no ',' left, so this was the last specifier */ + arg = strchr(val, ','); + if (arg) + *arg = '\0'; + what = index_in_strings(conv_words, val); + if (what < 0) + bb_error_msg_and_die(bb_msg_invalid_arg, val, "conv"); + flags |= (1 << what); + if (!arg) /* no ',' left, so this was the last specifier */ break; - arg = key + 1; /* skip this keyword and ',' */ + /* *arg = ','; - to preserve ps listing? */ + val = arg + 1; /* skip this keyword and ',' */ } - continue; + continue; /* we trashed 'what', can't fall through */ } #endif if (what == OP_bs) { - ibs = obs = xatoul_range_sfx(arg, 1, ((size_t)-1L)/2, dd_suffixes); - continue; + ibs = obs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, dd_suffixes); + /*continue;*/ } /* These can be large: */ if (what == OP_count) { flags |= FLAG_COUNT; - count = XATOU_SFX(arg, dd_suffixes); - continue; + count = XATOU_SFX(val, dd_suffixes); + /*continue;*/ } if (what == OP_seek) { - seek = XATOU_SFX(arg, dd_suffixes); - continue; + seek = XATOU_SFX(val, dd_suffixes); + /*continue;*/ } if (what == OP_skip) { - skip = XATOU_SFX(arg, dd_suffixes); - continue; + skip = XATOU_SFX(val, dd_suffixes); + /*continue;*/ } if (what == OP_if) { - infile = arg; - continue; + infile = val; + /*continue;*/ } - if (what == OP_of) - outfile = arg; - } + if (what == OP_of) { + outfile = val; + /*continue;*/ + } + } /* end of "for (argv[n])" */ + //XXX:FIXME for huge ibs or obs, malloc'ing them isn't the brightest idea ever ibuf = obuf = xmalloc(ibs); if (ibs != obs) { @@ -304,13 +326,17 @@ int dd_main(int argc, char **argv) } } else if (write_and_stats(ibuf, n, obs, outfile)) goto out_status; + + if (flags & FLAG_FSYNC) { + if (fsync(ofd) < 0) + goto die_outfile; + } } if (ENABLE_FEATURE_DD_IBS_OBS && oc) { w = full_write_or_warn(obuf, oc, outfile); if (w < 0) goto out_status; - if (w > 0) - G.out_part++; + if (w > 0) G.out_part++; } if (close(ifd) < 0) { die_infile: |