diff options
Diffstat (limited to 'src/od.c')
| -rw-r--r-- | src/od.c | 86 |
1 files changed, 73 insertions, 13 deletions
@@ -307,15 +307,75 @@ static struct option const long_options[] = }; static void -usage () +usage (status) + int status; { - fprintf (stderr, "\ -Usage: %s [-abcdfhiloxv] [-s[bytes]] [-w[bytes]] [-A radix] [-j bytes]\n\ - [-N bytes] [-t type] [--skip-bytes=bytes] [--address-radix=radix]\n\ - [--read-bytes=bytes] [--format=type] [--output-duplicates]\n\ - [--strings[=bytes]] [--width[=bytes]] [--help] [--version] [file...]\n", - program_name); - exit (1); + if (status != 0) + fprintf (stderr, "Try `%s --help' for more information.\n", + program_name); + else + { + printf ("\ +Usage: %s [OPTION]... [FILE]...\n\ + or: %s -C [FILE] [[+]OFFSET [[+]LABEL]]\n\ +", + program_name, program_name); + printf ("\ +\n\ + -A, --address-radix RADIX decide how file offsets are printed\n\ + -C, --compatible trigger older syntax\n\ + -N, --read-bytes BYTES limit dump to BYTES input bytes per file\n\ + -j, --skip-bytes BYTES skip BYTES input bytes first on each file\n\ + -s, --strings [BYTES] output strings of at least BYTES graphic chars\n\ + -t, --format TYPE select output format or formats\n\ + -v, --output-duplicates do not use * to mark line suppression\n\ + -w, --width [BYTES] output BYTES bytes per output line\n\ + --help display this help and exit\n\ + --version output version information and exit\n\ +\n\ +Pre-POSIX format specifications may be intermixed, they accumulate:\n\ + -a same as -t a, select named characters\n\ + -b same as -t oC, select octal bytes\n\ + -c same as -t c, select ASCII characters or backslash escapes\n\ + -d same as -t u2, select unsigned decimal shorts\n\ + -f same as -t fF, select floats\n\ + -h same as -t x2, select hexadecimal shorts\n\ + -i same as -t d2, select decimal shorts\n\ + -l same as -t d4, select decimal longs\n\ + -o same as -t o2, select octal shorts\n\ + -x same as -t x2, select hexadecimal shorts\n\ +"); + printf ("\ +\n\ +For older syntax (second call format), OFFSET means -j OFFSET. LABEL\n\ +is the pseudo-address at first byte printed, incremented when dump is\n\ +progressing. For OFFSET and LABEL, a 0x or 0X prefix indicates\n\ +hexadecimal, suffixes maybe . for octal and b multiply by 512.\n\ +\n\ +TYPE is made up of one or more of these specifications:\n\ +\n\ + a named character\n\ + c ASCII character or backslash escape\n\ + d[SIZE] signed decimal, SIZE bytes per integer\n\ + f[SIZE] floating point, SIZE bytes per integer\n\ + o[SIZE] octal, SIZE bytes per integer\n\ + u[SIZE] unsigned decimal, SIZE bytes per integer\n\ + x[SIZE] hexadecimal, SIZE bytes per integer\n\ +\n\ +SIZE is a number. For TYPE in doux, SIZE may also be C for\n\ +sizeof(char), S for sizeof(short), I for sizeof(int) or L for\n\ +sizeof(long). If TYPE is f, SIZE may also be F for sizeof(float), D\n\ +for sizeof(double) or L for sizeof(long double).\n\ +\n\ +RADIX is d for decimal, o for octal, x for hexadecimal or n for none.\n\ +BYTES is hexadecimal with 0x or 0X prefix, it is multiplied by 512\n\ +with b suffix, by 1024 with k and by 1048576 with m. -s without a\n\ +number implies 3. -w without a number implies 32. By default, od\n\ +uses -A o -t d2 -w 16. With no FILE, or when FILE is -, read standard\n\ +input.\n\ +"); + } + exit (status); } /* Compute the greatest common denominator of U and V @@ -1795,7 +1855,7 @@ main (argc, argv) break; default: - usage (); + usage (1); break; } } @@ -1807,7 +1867,7 @@ main (argc, argv) } if (show_help) - usage (); + usage (0); if (flag_dump_strings && n_specs > 0) error (2, 0, "no type may be specified when dumping strings"); @@ -1856,7 +1916,7 @@ main (argc, argv) error (0, 0, "invalid second operand in compatibility mode `%s'", argv[optind + 1]); - usage (); + usage (1); } } else if (n_files == 3) @@ -1876,14 +1936,14 @@ main (argc, argv) { error (0, 0, "in compatibility mode the last 2 arguments must be offsets"); - usage (); + usage (1); } } else { error (0, 0, "in compatibility mode there may be no more than 3 arguments"); - usage (); + usage (1); } if (flag_pseudo_start) |