diff options
Diffstat (limited to 'coreutils')
| -rw-r--r-- | coreutils/dd.c | 119 |
1 files changed, 69 insertions, 50 deletions
diff --git a/coreutils/dd.c b/coreutils/dd.c index 78d8315..c0df0b7 100644 --- a/coreutils/dd.c +++ b/coreutils/dd.c @@ -35,15 +35,26 @@ static void dd_output_status(int ATTRIBUTE_UNUSED cur_signal) out_full, out_part); } +static ssize_t full_write_or_warn(int fd, const void *buf, size_t len, + const char* filename) +{ + ssize_t n = full_write(fd, buf, len); + if (n < 0) + bb_perror_msg("writing '%s'", filename); + return n; +} + int dd_main(int argc, char **argv) { -#define sync_flag (1<<0) -#define noerror (1<<1) -#define trunc_flag (1<<2) -#define twobufs_flag (1<<3) + enum { + sync_flag = 1 << 0, + noerror = 1 << 1, + trunc_flag = 1 << 2, + twobufs_flag = 1 << 3, + }; int flags = trunc_flag; size_t oc = 0, ibs = 512, obs = 512; - ssize_t n; + ssize_t n, w; off_t seek = 0, skip = 0, count = OFF_T_MAX; int oflag, ifd, ofd; const char *infile = NULL, *outfile = NULL; @@ -60,52 +71,53 @@ int dd_main(int argc, char **argv) } for (n = 1; n < argc; n++) { + char *arg = argv[n]; + /* Must fit into positive ssize_t */ + if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("ibs=", arg, 4)) + ibs = xatoul_range_sfx(arg+4, 0, ((size_t)-1L)/2, dd_suffixes); + else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("obs=", arg, 4)) + obs = xatoul_range_sfx(arg+4, 0, ((size_t)-1L)/2, dd_suffixes); + else if (!strncmp("bs=", arg, 3)) + ibs = obs = xatoul_range_sfx(arg+3, 0, ((size_t)-1L)/2, dd_suffixes); // FIXME: make them capable of eating LARGE numbers - if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("ibs=", argv[n], 4)) { - ibs = xatoul_sfx(argv[n]+4, dd_suffixes); - flags |= twobufs_flag; - } else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("obs=", argv[n], 4)) { - obs = xatoul_sfx(argv[n]+4, dd_suffixes); - flags |= twobufs_flag; - } else if (!strncmp("bs=", argv[n], 3)) - ibs = obs = xatoul_sfx(argv[n]+3, dd_suffixes); - else if (!strncmp("count=", argv[n], 6)) - count = xatoul_sfx(argv[n]+6, dd_suffixes); - else if (!strncmp("seek=", argv[n], 5)) - seek = xatoul_sfx(argv[n]+5, dd_suffixes); - else if (!strncmp("skip=", argv[n], 5)) - skip = xatoul_sfx(argv[n]+5, dd_suffixes); - else if (!strncmp("if=", argv[n], 3)) - infile = argv[n]+3; - else if (!strncmp("of=", argv[n], 3)) - outfile = argv[n]+3; - else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("conv=", argv[n], 5)) { - ibuf = argv[n]+5; + else if (!strncmp("count=", arg, 6)) + count = xatoul_sfx(arg+6, dd_suffixes); + else if (!strncmp("seek=", arg, 5)) + seek = xatoul_sfx(arg+5, dd_suffixes); + else if (!strncmp("skip=", arg, 5)) + skip = xatoul_sfx(arg+5, dd_suffixes); + + else if (!strncmp("if=", arg, 3)) + infile = arg+3; + else if (!strncmp("of=", arg, 3)) + outfile = arg+3; + else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("conv=", arg, 5)) { + arg += 5; while (1) { - if (!strncmp("notrunc", ibuf, 7)) { + if (!strncmp("notrunc", arg, 7)) { flags &= ~trunc_flag; - ibuf += 7; - } else if (!strncmp("sync", ibuf, 4)) { + arg += 7; + } else if (!strncmp("sync", arg, 4)) { flags |= sync_flag; - ibuf += 4; - } else if (!strncmp("noerror", ibuf, 7)) { + arg += 4; + } else if (!strncmp("noerror", arg, 7)) { flags |= noerror; - ibuf += 7; + arg += 7; } else { - bb_error_msg_and_die(bb_msg_invalid_arg, argv[n]+5, "conv"); + bb_error_msg_and_die(bb_msg_invalid_arg, arg, "conv"); } - if (ibuf[0] == '\0') break; - if (ibuf[0] == ',') ibuf++; + if (arg[0] == '\0') break; + if (*arg++ != ',') bb_show_usage(); } } else bb_show_usage(); } - ibuf = xmalloc(ibs); - if (flags & twobufs_flag) + ibuf = obuf = xmalloc(ibs); + if (ibs != obs) { + flags |= twobufs_flag; obuf = xmalloc(obs); - else - obuf = ibuf; + } if (infile != NULL) ifd = xopen(infile, O_RDONLY); @@ -173,7 +185,7 @@ int dd_main(int argc, char **argv) in_full++; else { in_part++; - if (sync_flag) { + if (flags & sync_flag) { memset(ibuf + n, '\0', ibs - n); n = ibs; } @@ -190,33 +202,40 @@ int dd_main(int argc, char **argv) tmp += d; oc += d; if (oc == obs) { - xwrite(ofd, obuf, obs); - out_full++; + w = full_write_or_warn(ofd, obuf, obs, outfile); + if (w < 0) goto out_status; + if (w == obs) + out_full++; + else if (w > 0) + out_part++; oc = 0; } } } else { - xwrite(ofd, ibuf, n); - if (n == ibs) + w = full_write_or_warn(ofd, ibuf, n, outfile); + if (w < 0) goto out_status; + if (w == obs) out_full++; - else + else if (w > 0) out_part++; } } if (ENABLE_FEATURE_DD_IBS_OBS && oc) { - xwrite(ofd, obuf, oc); - out_part++; + w = full_write_or_warn(ofd, obuf, oc, outfile); + if (w < 0) goto out_status; + if (w > 0) + out_part++; } - if (close (ifd) < 0) { + if (close(ifd) < 0) { bb_perror_msg_and_die("%s", infile); } - if (close (ofd) < 0) { -die_outfile: + if (close(ofd) < 0) { + die_outfile: bb_perror_msg_and_die("%s", outfile); } - + out_status: dd_output_status(0); return EXIT_SUCCESS; |