| /* od -- dump files in octal and other formats |
| Copyright (C) 92, 1995-2004 Free Software Foundation, Inc. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software Foundation, |
| Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| |
| /* Written by Jim Meyering. */ |
| |
| /* Busyboxed by Denys Vlasenko |
| |
| Based on od.c from coreutils-5.2.1 |
| Top bloat sources: |
| |
| 00000073 t parse_old_offset |
| 0000007b t get_lcm |
| 00000090 r long_options |
| 00000092 t print_named_ascii |
| 000000bf t print_ascii |
| 00000168 t write_block |
| 00000366 t decode_format_string |
| 00000a71 T od_main |
| |
| Tested for compat with coreutils 6.3 |
| using this script. Minor differences fixed. |
| |
| #!/bin/sh |
| echo STD |
| time /path/to/coreutils/od \ |
| ...params... \ |
| >std |
| echo Exit code $? |
| echo BBOX |
| time ./busybox od \ |
| ...params... \ |
| >bbox |
| echo Exit code $? |
| diff -u -a std bbox >bbox.diff || { echo Different!; sleep 1; } |
| |
| */ |
| |
| #include "libbb.h" |
| |
| #define assert(a) ((void)0) |
| |
| /* Check for 0x7f is a coreutils 6.3 addition */ |
| #define ISPRINT(c) (((c)>=' ') && (c) != 0x7f) |
| |
| typedef long double longdouble_t; |
| typedef unsigned long long ulonglong_t; |
| typedef long long llong; |
| |
| #if ENABLE_LFS |
| # define xstrtooff_sfx xstrtoull_sfx |
| #else |
| # define xstrtooff_sfx xstrtoul_sfx |
| #endif |
| |
| /* The default number of input bytes per output line. */ |
| #define DEFAULT_BYTES_PER_BLOCK 16 |
| |
| /* The number of decimal digits of precision in a float. */ |
| #ifndef FLT_DIG |
| # define FLT_DIG 7 |
| #endif |
| |
| /* The number of decimal digits of precision in a double. */ |
| #ifndef DBL_DIG |
| # define DBL_DIG 15 |
| #endif |
| |
| /* The number of decimal digits of precision in a long double. */ |
| #ifndef LDBL_DIG |
| # define LDBL_DIG DBL_DIG |
| #endif |
| |
| enum size_spec { |
| NO_SIZE, |
| CHAR, |
| SHORT, |
| INT, |
| LONG, |
| LONG_LONG, |
| FLOAT_SINGLE, |
| FLOAT_DOUBLE, |
| FLOAT_LONG_DOUBLE, |
| N_SIZE_SPECS |
| }; |
| |
| enum output_format { |
| SIGNED_DECIMAL, |
| UNSIGNED_DECIMAL, |
| OCTAL, |
| HEXADECIMAL, |
| FLOATING_POINT, |
| NAMED_CHARACTER, |
| CHARACTER |
| }; |
| |
| /* Each output format specification (from '-t spec' or from |
| old-style options) is represented by one of these structures. */ |
| struct tspec { |
| enum output_format fmt; |
| enum size_spec size; |
| void (*print_function) (size_t, const char *, const char *); |
| char *fmt_string; |
| int hexl_mode_trailer; |
| int field_width; |
| }; |
| |
| /* Convert the number of 8-bit bytes of a binary representation to |
| the number of characters (digits + sign if the type is signed) |
| required to represent the same quantity in the specified base/type. |
| For example, a 32-bit (4-byte) quantity may require a field width |
| as wide as the following for these types: |
| 11 unsigned octal |
| 11 signed decimal |
| 10 unsigned decimal |
| 8 unsigned hexadecimal */ |
| |
| static const uint8_t bytes_to_oct_digits[] ALIGN1 = |
| {0, 3, 6, 8, 11, 14, 16, 19, 22, 25, 27, 30, 32, 35, 38, 41, 43}; |
| |
| static const uint8_t bytes_to_signed_dec_digits[] ALIGN1 = |
| {1, 4, 6, 8, 11, 13, 16, 18, 20, 23, 25, 28, 30, 33, 35, 37, 40}; |
| |
| static const uint8_t bytes_to_unsigned_dec_digits[] ALIGN1 = |
| {0, 3, 5, 8, 10, 13, 15, 17, 20, 22, 25, 27, 29, 32, 34, 37, 39}; |
| |
| static const uint8_t bytes_to_hex_digits[] ALIGN1 = |
| {0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32}; |
| |
| /* Convert enum size_spec to the size of the named type. */ |
| static const signed char width_bytes[] ALIGN1 = { |
| -1, |
| sizeof(char), |
| sizeof(short), |
| sizeof(int), |
| sizeof(long), |
| sizeof(ulonglong_t), |
| sizeof(float), |
| sizeof(double), |
| sizeof(longdouble_t) |
| }; |
| /* Ensure that for each member of 'enum size_spec' there is an |
| initializer in the width_bytes array. */ |
| struct ERR_width_bytes_has_bad_size { |
| char ERR_width_bytes_has_bad_size[ARRAY_SIZE(width_bytes) == N_SIZE_SPECS ? 1 : -1]; |
| }; |
| |
| static smallint flag_dump_strings; |
| /* Non-zero if an old-style 'pseudo-address' was specified. */ |
| static smallint flag_pseudo_start; |
| static smallint limit_bytes_to_format; |
| /* When zero and two or more consecutive blocks are equal, format |
| only the first block and output an asterisk alone on the following |
| line to indicate that identical blocks have been elided. */ |
| static smallint verbose; |
| static smallint ioerror; |
| |
| static size_t string_min; |
| |
| /* An array of specs describing how to format each input block. */ |
| static size_t n_specs; |
| static struct tspec *spec; |
| |
| /* Function that accepts an address and an optional following char, |
| and prints the address and char to stdout. */ |
| static void (*format_address)(off_t, char); |
| /* The difference between the old-style pseudo starting address and |
| the number of bytes to skip. */ |
| static off_t pseudo_offset; |
| /* When zero, MAX_BYTES_TO_FORMAT and END_OFFSET are ignored, and all |
| input is formatted. */ |
| |
| /* The number of input bytes formatted per output line. It must be |
| a multiple of the least common multiple of the sizes associated with |
| the specified output types. It should be as large as possible, but |
| no larger than 16 -- unless specified with the -w option. */ |
| static unsigned bytes_per_block = 32; /* have to use unsigned, not size_t */ |
| |
| /* A NULL-terminated list of the file-arguments from the command line. */ |
| static const char *const *file_list; |
| |
| /* The input stream associated with the current file. */ |
| static FILE *in_stream; |
| |
| #define MAX_INTEGRAL_TYPE_SIZE sizeof(ulonglong_t) |
| static const unsigned char integral_type_size[MAX_INTEGRAL_TYPE_SIZE + 1] ALIGN1 = { |
| [sizeof(char)] = CHAR, |
| #if USHRT_MAX != UCHAR_MAX |
| [sizeof(short)] = SHORT, |
| #endif |
| #if UINT_MAX != USHRT_MAX |
| [sizeof(int)] = INT, |
| #endif |
| #if ULONG_MAX != UINT_MAX |
| [sizeof(long)] = LONG, |
| #endif |
| #if ULLONG_MAX != ULONG_MAX |
| [sizeof(ulonglong_t)] = LONG_LONG, |
| #endif |
| }; |
| |
| #define MAX_FP_TYPE_SIZE sizeof(longdouble_t) |
| static const unsigned char fp_type_size[MAX_FP_TYPE_SIZE + 1] ALIGN1 = { |
| /* gcc seems to allow repeated indexes. Last one stays */ |
| [sizeof(longdouble_t)] = FLOAT_LONG_DOUBLE, |
| [sizeof(double)] = FLOAT_DOUBLE, |
| [sizeof(float)] = FLOAT_SINGLE |
| }; |
| |
| |
| static unsigned |
| gcd(unsigned u, unsigned v) |
| { |
| unsigned t; |
| while (v != 0) { |
| t = u % v; |
| u = v; |
| v = t; |
| } |
| return u; |
| } |
| |
| /* Compute the least common multiple of U and V. */ |
| static unsigned |
| lcm(unsigned u, unsigned v) { |
| unsigned t = gcd(u, v); |
| if (t == 0) |
| return 0; |
| return u * v / t; |
| } |
| |
| static void |
| print_s_char(size_t n_bytes, const char *block, const char *fmt_string) |
| { |
| while (n_bytes--) { |
| int tmp = *(signed char *) block; |
| printf(fmt_string, tmp); |
| block += sizeof(unsigned char); |
| } |
| } |
| |
| static void |
| print_char(size_t n_bytes, const char *block, const char *fmt_string) |
| { |
| while (n_bytes--) { |
| unsigned tmp = *(unsigned char *) block; |
| printf(fmt_string, tmp); |
| block += sizeof(unsigned char); |
| } |
| } |
| |
| static void |
| print_s_short(size_t n_bytes, const char *block, const char *fmt_string) |
| { |
| n_bytes /= sizeof(signed short); |
| while (n_bytes--) { |
| int tmp = *(signed short *) block; |
| printf(fmt_string, tmp); |
| block += sizeof(unsigned short); |
| } |
| } |
| |
| static void |
| print_short(size_t n_bytes, const char *block, const char *fmt_string) |
| { |
| n_bytes /= sizeof(unsigned short); |
| while (n_bytes--) { |
| unsigned tmp = *(unsigned short *) block; |
| printf(fmt_string, tmp); |
| block += sizeof(unsigned short); |
| } |
| } |
| |
| static void |
| print_int(size_t n_bytes, const char *block, const char *fmt_string) |
| { |
| n_bytes /= sizeof(unsigned); |
| while (n_bytes--) { |
| unsigned tmp = *(unsigned *) block; |
| printf(fmt_string, tmp); |
| block += sizeof(unsigned); |
| } |
| } |
| |
| #if UINT_MAX == ULONG_MAX |
| # define print_long print_int |
| #else |
| static void |
| print_long(size_t n_bytes, const char *block, const char *fmt_string) |
| { |
| n_bytes /= sizeof(unsigned long); |
| while (n_bytes--) { |
| unsigned long tmp = *(unsigned long *) block; |
| printf(fmt_string, tmp); |
| block += sizeof(unsigned long); |
| } |
| } |
| #endif |
| |
| #if ULONG_MAX == ULLONG_MAX |
| # define print_long_long print_long |
| #else |
| static void |
| print_long_long(size_t n_bytes, const char *block, const char *fmt_string) |
| { |
| n_bytes /= sizeof(ulonglong_t); |
| while (n_bytes--) { |
| ulonglong_t tmp = *(ulonglong_t *) block; |
| printf(fmt_string, tmp); |
| block += sizeof(ulonglong_t); |
| } |
| } |
| #endif |
| |
| static void |
| print_float(size_t n_bytes, const char *block, const char *fmt_string) |
| { |
| n_bytes /= sizeof(float); |
| while (n_bytes--) { |
| float tmp = *(float *) block; |
| printf(fmt_string, tmp); |
| block += sizeof(float); |
| } |
| } |
| |
| static void |
| print_double(size_t n_bytes, const char *block, const char *fmt_string) |
| { |
| n_bytes /= sizeof(double); |
| while (n_bytes--) { |
| double tmp = *(double *) block; |
| printf(fmt_string, tmp); |
| block += sizeof(double); |
| } |
| } |
| |
| static void |
| print_long_double(size_t n_bytes, const char *block, const char *fmt_string) |
| { |
| n_bytes /= sizeof(longdouble_t); |
| while (n_bytes--) { |
| longdouble_t tmp = *(longdouble_t *) block; |
| printf(fmt_string, tmp); |
| block += sizeof(longdouble_t); |
| } |
| } |
| |
| /* print_[named]_ascii are optimized for speed. |
| * Remember, someday you may want to pump gigabytes through this thing. |
| * Saving a dozen of .text bytes here is counter-productive */ |
| |
| static void |
| print_named_ascii(size_t n_bytes, const char *block, |
| const char *unused_fmt_string UNUSED_PARAM) |
| { |
| /* Names for some non-printing characters. */ |
| static const char charname[33][3] ALIGN1 = { |
| "nul", "soh", "stx", "etx", "eot", "enq", "ack", "bel", |
| " bs", " ht", " nl", " vt", " ff", " cr", " so", " si", |
| "dle", "dc1", "dc2", "dc3", "dc4", "nak", "syn", "etb", |
| "can", " em", "sub", "esc", " fs", " gs", " rs", " us", |
| " sp" |
| }; |
| // buf[N] pos: 01234 56789 |
| char buf[12] = " x\0 0xx\0"; |
| // actually " x\0 xxx\0", but I want to share the string with below. |
| // [12] because we take three 32bit stack slots anyway, and |
| // gcc is too dumb to initialize with constant stores, |
| // it copies initializer from rodata. Oh well. |
| |
| while (n_bytes--) { |
| unsigned masked_c = *(unsigned char *) block++; |
| |
| masked_c &= 0x7f; |
| if (masked_c == 0x7f) { |
| fputs(" del", stdout); |
| continue; |
| } |
| if (masked_c > ' ') { |
| buf[3] = masked_c; |
| fputs(buf, stdout); |
| continue; |
| } |
| /* Why? Because printf(" %3.3s") is much slower... */ |
| buf[6] = charname[masked_c][0]; |
| buf[7] = charname[masked_c][1]; |
| buf[8] = charname[masked_c][2]; |
| fputs(buf+5, stdout); |
| } |
| } |
| |
| static void |
| print_ascii(size_t n_bytes, const char *block, |
| const char *unused_fmt_string UNUSED_PARAM) |
| { |
| // buf[N] pos: 01234 56789 |
| char buf[12] = " x\0 0xx\0"; |
| |
| while (n_bytes--) { |
| const char *s; |
| unsigned c = *(unsigned char *) block++; |
| |
| if (ISPRINT(c)) { |
| buf[3] = c; |
| fputs(buf, stdout); |
| continue; |
| } |
| switch (c) { |
| case '\0': |
| s = " \\0"; |
| break; |
| case '\007': |
| s = " \\a"; |
| break; |
| case '\b': |
| s = " \\b"; |
| break; |
| case '\f': |
| s = " \\f"; |
| break; |
| case '\n': |
| s = " \\n"; |
| break; |
| case '\r': |
| s = " \\r"; |
| break; |
| case '\t': |
| s = " \\t"; |
| break; |
| case '\v': |
| s = " \\v"; |
| break; |
| case '\x7f': |
| s = " 177"; |
| break; |
| default: /* c is never larger than 040 */ |
| buf[7] = (c >> 3) + '0'; |
| buf[8] = (c & 7) + '0'; |
| s = buf + 5; |
| } |
| fputs(s, stdout); |
| } |
| } |
| |
| /* Given a list of one or more input filenames FILE_LIST, set the global |
| file pointer IN_STREAM and the global string INPUT_FILENAME to the |
| first one that can be successfully opened. Modify FILE_LIST to |
| reference the next filename in the list. A file name of "-" is |
| interpreted as standard input. If any file open fails, give an error |
| message and return nonzero. */ |
| |
| static void |
| open_next_file(void) |
| { |
| while (1) { |
| if (!*file_list) |
| return; |
| in_stream = fopen_or_warn_stdin(*file_list++); |
| if (in_stream) { |
| break; |
| } |
| ioerror = 1; |
| } |
| |
| if (limit_bytes_to_format && !flag_dump_strings) |
| setbuf(in_stream, NULL); |
| } |
| |
| /* Test whether there have been errors on in_stream, and close it if |
| it is not standard input. Return nonzero if there has been an error |
| on in_stream or stdout; return zero otherwise. This function will |
| report more than one error only if both a read and a write error |
| have occurred. IN_ERRNO, if nonzero, is the error number |
| corresponding to the most recent action for IN_STREAM. */ |
| |
| static void |
| check_and_close(void) |
| { |
| if (in_stream) { |
| if (ferror(in_stream)) { |
| bb_error_msg("%s: read error", (in_stream == stdin) |
| ? bb_msg_standard_input |
| : file_list[-1] |
| ); |
| ioerror = 1; |
| } |
| fclose_if_not_stdin(in_stream); |
| in_stream = NULL; |
| } |
| |
| if (ferror(stdout)) { |
| bb_error_msg("write error"); |
| ioerror = 1; |
| } |
| } |
| |
| /* If S points to a single valid modern od format string, put |
| a description of that format in *TSPEC, return pointer to |
| character following the just-decoded format. |
| For example, if S were "d4afL", we will return a rtp to "afL" |
| and *TSPEC would be |
| { |
| fmt = SIGNED_DECIMAL; |
| size = INT or LONG; (whichever integral_type_size[4] resolves to) |
| print_function = print_int; (assuming size == INT) |
| fmt_string = "%011d%c"; |
| } |
| S_ORIG is solely for reporting errors. It should be the full format |
| string argument. */ |
| |
| static const char * |
| decode_one_format(const char *s_orig, const char *s, struct tspec *tspec) |
| { |
| enum size_spec size_spec; |
| unsigned size; |
| enum output_format fmt; |
| const char *p; |
| char *end; |
| char *fmt_string = NULL; |
| void (*print_function) (size_t, const char *, const char *); |
| unsigned c; |
| unsigned field_width = 0; |
| int pos; |
| |
| |
| switch (*s) { |
| case 'd': |
| case 'o': |
| case 'u': |
| case 'x': { |
| static const char CSIL[] ALIGN1 = "CSIL"; |
| |
| c = *s++; |
| p = strchr(CSIL, *s); |
| if (!p) { |
| size = sizeof(int); |
| if (isdigit(s[0])) { |
| size = bb_strtou(s, &end, 0); |
| if (errno == ERANGE |
| || MAX_INTEGRAL_TYPE_SIZE < size |
| || integral_type_size[size] == NO_SIZE |
| ) { |
| bb_error_msg_and_die("invalid type string '%s'; " |
| "%u-byte %s type is not supported", |
| s_orig, size, "integral"); |
| } |
| s = end; |
| } |
| } else { |
| static const uint8_t CSIL_sizeof[4] = { |
| sizeof(char), |
| sizeof(short), |
| sizeof(int), |
| sizeof(long), |
| }; |
| size = CSIL_sizeof[p - CSIL]; |
| s++; /* skip C/S/I/L */ |
| } |
| |
| #define ISPEC_TO_FORMAT(Spec, Min_format, Long_format, Max_format) \ |
| ((Spec) == LONG_LONG ? (Max_format) \ |
| : ((Spec) == LONG ? (Long_format) : (Min_format))) |
| |
| #define FMT_BYTES_ALLOCATED 9 |
| size_spec = integral_type_size[size]; |
| |
| { |
| static const char doux[] ALIGN1 = "doux"; |
| static const char doux_fmt_letter[][4] = { |
| "lld", "llo", "llu", "llx" |
| }; |
| static const enum output_format doux_fmt[] = { |
| SIGNED_DECIMAL, |
| OCTAL, |
| UNSIGNED_DECIMAL, |
| HEXADECIMAL, |
| }; |
| static const uint8_t *const doux_bytes_to_XXX[] = { |
| bytes_to_signed_dec_digits, |
| bytes_to_oct_digits, |
| bytes_to_unsigned_dec_digits, |
| bytes_to_hex_digits, |
| }; |
| static const char doux_fmtstring[][sizeof(" %%0%u%s")] = { |
| " %%%u%s", |
| " %%0%u%s", |
| " %%%u%s", |
| " %%0%u%s", |
| }; |
| |
| pos = strchr(doux, c) - doux; |
| fmt = doux_fmt[pos]; |
| field_width = doux_bytes_to_XXX[pos][size]; |
| p = doux_fmt_letter[pos] + 2; |
| if (size_spec == LONG) p--; |
| if (size_spec == LONG_LONG) p -= 2; |
| fmt_string = xasprintf(doux_fmtstring[pos], field_width, p); |
| } |
| |
| switch (size_spec) { |
| case CHAR: |
| print_function = (fmt == SIGNED_DECIMAL |
| ? print_s_char |
| : print_char); |
| break; |
| case SHORT: |
| print_function = (fmt == SIGNED_DECIMAL |
| ? print_s_short |
| : print_short); |
| break; |
| case INT: |
| print_function = print_int; |
| break; |
| case LONG: |
| print_function = print_long; |
| break; |
| default: /* case LONG_LONG: */ |
| print_function = print_long_long; |
| break; |
| } |
| break; |
| } |
| |
| case 'f': { |
| static const char FDL[] ALIGN1 = "FDL"; |
| |
| fmt = FLOATING_POINT; |
| ++s; |
| p = strchr(FDL, *s); |
| if (!p) { |
| size = sizeof(double); |
| if (isdigit(s[0])) { |
| size = bb_strtou(s, &end, 0); |
| if (errno == ERANGE || size > MAX_FP_TYPE_SIZE |
| || fp_type_size[size] == NO_SIZE |
| ) { |
| bb_error_msg_and_die("invalid type string '%s'; " |
| "%u-byte %s type is not supported", |
| s_orig, size, "floating point"); |
| } |
| s = end; |
| } |
| } else { |
| static const uint8_t FDL_sizeof[] = { |
| sizeof(float), |
| sizeof(double), |
| sizeof(longdouble_t), |
| }; |
| |
| size = FDL_sizeof[p - FDL]; |
| } |
| |
| size_spec = fp_type_size[size]; |
| |
| switch (size_spec) { |
| case FLOAT_SINGLE: |
| print_function = print_float; |
| field_width = FLT_DIG + 8; |
| /* Don't use %#e; not all systems support it. */ |
| fmt_string = xasprintf(" %%%d.%de", field_width, FLT_DIG); |
| break; |
| case FLOAT_DOUBLE: |
| print_function = print_double; |
| field_width = DBL_DIG + 8; |
| fmt_string = xasprintf(" %%%d.%de", field_width, DBL_DIG); |
| break; |
| default: /* case FLOAT_LONG_DOUBLE: */ |
| print_function = print_long_double; |
| field_width = LDBL_DIG + 8; |
| fmt_string = xasprintf(" %%%d.%dLe", field_width, LDBL_DIG); |
| break; |
| } |
| break; |
| } |
| |
| case 'a': |
| ++s; |
| fmt = NAMED_CHARACTER; |
| size_spec = CHAR; |
| print_function = print_named_ascii; |
| field_width = 3; |
| break; |
| case 'c': |
| ++s; |
| fmt = CHARACTER; |
| size_spec = CHAR; |
| print_function = print_ascii; |
| field_width = 3; |
| break; |
| default: |
| bb_error_msg_and_die("invalid character '%c' " |
| "in type string '%s'", *s, s_orig); |
| } |
| |
| tspec->size = size_spec; |
| tspec->fmt = fmt; |
| tspec->print_function = print_function; |
| tspec->fmt_string = fmt_string; |
| |
| tspec->field_width = field_width; |
| tspec->hexl_mode_trailer = (*s == 'z'); |
| if (tspec->hexl_mode_trailer) |
| s++; |
| |
| return s; |
| } |
| |
| /* Decode the modern od format string S. Append the decoded |
| representation to the global array SPEC, reallocating SPEC if |
| necessary. */ |
| |
| static void |
| decode_format_string(const char *s) |
| { |
| const char *s_orig = s; |
| |
| while (*s != '\0') { |
| struct tspec tspec; |
| const char *next; |
| |
| next = decode_one_format(s_orig, s, &tspec); |
| |
| assert(s != next); |
| s = next; |
| spec = xrealloc_vector(spec, 4, n_specs); |
| memcpy(&spec[n_specs], &tspec, sizeof(spec[0])); |
| n_specs++; |
| } |
| } |
| |
| /* Given a list of one or more input filenames FILE_LIST, set the global |
| file pointer IN_STREAM to position N_SKIP in the concatenation of |
| those files. If any file operation fails or if there are fewer than |
| N_SKIP bytes in the combined input, give an error message and return |
| nonzero. When possible, use seek rather than read operations to |
| advance IN_STREAM. */ |
| |
| static void |
| skip(off_t n_skip) |
| { |
| if (n_skip == 0) |
| return; |
| |
| while (in_stream) { /* !EOF */ |
| struct stat file_stats; |
| |
| /* First try seeking. For large offsets, this extra work is |
| worthwhile. If the offset is below some threshold it may be |
| more efficient to move the pointer by reading. There are two |
| issues when trying to seek: |
| - the file must be seekable. |
| - before seeking to the specified position, make sure |
| that the new position is in the current file. |
| Try to do that by getting file's size using fstat. |
| But that will work only for regular files. */ |
| |
| /* The st_size field is valid only for regular files |
| (and for symbolic links, which cannot occur here). |
| If the number of bytes left to skip is at least |
| as large as the size of the current file, we can |
| decrement n_skip and go on to the next file. */ |
| if (fstat(fileno(in_stream), &file_stats) == 0 |
| && S_ISREG(file_stats.st_mode) && file_stats.st_size > 0 |
| ) { |
| if (file_stats.st_size < n_skip) { |
| n_skip -= file_stats.st_size; |
| /* take "check & close / open_next" route */ |
| } else { |
| if (fseeko(in_stream, n_skip, SEEK_CUR) != 0) |
| ioerror = 1; |
| return; |
| } |
| } else { |
| /* If it's not a regular file with positive size, |
| position the file pointer by reading. */ |
| char buf[1024]; |
| size_t n_bytes_to_read = 1024; |
| size_t n_bytes_read; |
| |
| while (n_skip > 0) { |
| if (n_skip < n_bytes_to_read) |
| n_bytes_to_read = n_skip; |
| n_bytes_read = fread(buf, 1, n_bytes_to_read, in_stream); |
| n_skip -= n_bytes_read; |
| if (n_bytes_read != n_bytes_to_read) |
| break; /* EOF on this file or error */ |
| } |
| } |
| if (n_skip == 0) |
| return; |
| |
| check_and_close(); |
| open_next_file(); |
| } |
| |
| if (n_skip) |
| bb_error_msg_and_die("can't skip past end of combined input"); |
| } |
| |
| |
| typedef void FN_format_address(off_t address, char c); |
| |
| static void |
| format_address_none(off_t address UNUSED_PARAM, char c UNUSED_PARAM) |
| { |
| } |
| |
| static char address_fmt[] ALIGN1 = "%0n"OFF_FMT"xc"; |
| /* Corresponds to 'x' above */ |
| #define address_base_char address_fmt[sizeof(address_fmt)-3] |
| /* Corresponds to 'n' above */ |
| #define address_pad_len_char address_fmt[2] |
| |
| static void |
| format_address_std(off_t address, char c) |
| { |
| /* Corresponds to 'c' */ |
| address_fmt[sizeof(address_fmt)-2] = c; |
| printf(address_fmt, address); |
| } |
| |
| #if ENABLE_LONG_OPTS |
| /* only used with --traditional */ |
| static void |
| format_address_paren(off_t address, char c) |
| { |
| putchar('('); |
| format_address_std(address, ')'); |
| if (c) putchar(c); |
| } |
| |
| static void |
| format_address_label(off_t address, char c) |
| { |
| format_address_std(address, ' '); |
| format_address_paren(address + pseudo_offset, c); |
| } |
| #endif |
| |
| static void |
| dump_hexl_mode_trailer(size_t n_bytes, const char *block) |
| { |
| fputs(" >", stdout); |
| while (n_bytes--) { |
| unsigned c = *(unsigned char *) block++; |
| c = (ISPRINT(c) ? c : '.'); |
| putchar(c); |
| } |
| putchar('<'); |
| } |
| |
| /* Write N_BYTES bytes from CURR_BLOCK to standard output once for each |
| of the N_SPEC format specs. CURRENT_OFFSET is the byte address of |
| CURR_BLOCK in the concatenation of input files, and it is printed |
| (optionally) only before the output line associated with the first |
| format spec. When duplicate blocks are being abbreviated, the output |
| for a sequence of identical input blocks is the output for the first |
| block followed by an asterisk alone on a line. It is valid to compare |
| the blocks PREV_BLOCK and CURR_BLOCK only when N_BYTES == BYTES_PER_BLOCK. |
| That condition may be false only for the last input block -- and then |
| only when it has not been padded to length BYTES_PER_BLOCK. */ |
| |
| static void |
| write_block(off_t current_offset, size_t n_bytes, |
| const char *prev_block, const char *curr_block) |
| { |
| static char first = 1; |
| static char prev_pair_equal = 0; |
| size_t i; |
| |
| if (!verbose && !first |
| && n_bytes == bytes_per_block |
| && memcmp(prev_block, curr_block, bytes_per_block) == 0 |
| ) { |
| if (prev_pair_equal) { |
| /* The two preceding blocks were equal, and the current |
| block is the same as the last one, so print nothing. */ |
| } else { |
| puts("*"); |
| prev_pair_equal = 1; |
| } |
| } else { |
| first = 0; |
| prev_pair_equal = 0; |
| for (i = 0; i < n_specs; i++) { |
| if (i == 0) |
| format_address(current_offset, '\0'); |
| else |
| printf("%*s", address_pad_len_char - '0', ""); |
| (*spec[i].print_function) (n_bytes, curr_block, spec[i].fmt_string); |
| if (spec[i].hexl_mode_trailer) { |
| /* space-pad out to full line width, then dump the trailer */ |
| int datum_width = width_bytes[spec[i].size]; |
| int blank_fields = (bytes_per_block - n_bytes) / datum_width; |
| int field_width = spec[i].field_width + 1; |
| printf("%*s", blank_fields * field_width, ""); |
| dump_hexl_mode_trailer(n_bytes, curr_block); |
| } |
| putchar('\n'); |
| } |
| } |
| } |
| |
| static void |
| read_block(size_t n, char *block, size_t *n_bytes_in_buffer) |
| { |
| assert(0 < n && n <= bytes_per_block); |
| |
| *n_bytes_in_buffer = 0; |
| |
| if (n == 0) |
| return; |
| |
| while (in_stream != NULL) { /* EOF. */ |
| size_t n_needed; |
| size_t n_read; |
| |
| n_needed = n - *n_bytes_in_buffer; |
| n_read = fread(block + *n_bytes_in_buffer, 1, n_needed, in_stream); |
| *n_bytes_in_buffer += n_read; |
| if (n_read == n_needed) |
| break; |
| /* error check is done in check_and_close */ |
| check_and_close(); |
| open_next_file(); |
| } |
| } |
| |
| /* Return the least common multiple of the sizes associated |
| with the format specs. */ |
| |
| static int |
| get_lcm(void) |
| { |
| size_t i; |
| int l_c_m = 1; |
| |
| for (i = 0; i < n_specs; i++) |
| l_c_m = lcm(l_c_m, width_bytes[(int) spec[i].size]); |
| return l_c_m; |
| } |
| |
| #if ENABLE_LONG_OPTS |
| /* If S is a valid traditional offset specification with an optional |
| leading '+' return nonzero and set *OFFSET to the offset it denotes. */ |
| |
| static int |
| parse_old_offset(const char *s, off_t *offset) |
| { |
| static const struct suffix_mult Bb[] = { |
| { "B", 1024 }, |
| { "b", 512 }, |
| { "", 0 } |
| }; |
| char *p; |
| int radix; |
| |
| /* Skip over any leading '+'. */ |
| if (s[0] == '+') ++s; |
| |
| /* Determine the radix we'll use to interpret S. If there is a '.', |
| * it's decimal, otherwise, if the string begins with '0X'or '0x', |
| * it's hexadecimal, else octal. */ |
| p = strchr(s, '.'); |
| radix = 8; |
| if (p) { |
| p[0] = '\0'; /* cheating */ |
| radix = 10; |
| } else if (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')) |
| radix = 16; |
| |
| *offset = xstrtooff_sfx(s, radix, Bb); |
| if (p) p[0] = '.'; |
| |
| return (*offset >= 0); |
| } |
| #endif |
| |
| /* Read a chunk of size BYTES_PER_BLOCK from the input files, write the |
| formatted block to standard output, and repeat until the specified |
| maximum number of bytes has been read or until all input has been |
| processed. If the last block read is smaller than BYTES_PER_BLOCK |
| and its size is not a multiple of the size associated with a format |
| spec, extend the input block with zero bytes until its length is a |
| multiple of all format spec sizes. Write the final block. Finally, |
| write on a line by itself the offset of the byte after the last byte |
| read. */ |
| |
| static void |
| dump(off_t current_offset, off_t end_offset) |
| { |
| char *block[2]; |
| int idx; |
| size_t n_bytes_read; |
| |
| block[0] = xmalloc(2*bytes_per_block); |
| block[1] = block[0] + bytes_per_block; |
| |
| idx = 0; |
| if (limit_bytes_to_format) { |
| while (1) { |
| size_t n_needed; |
| if (current_offset >= end_offset) { |
| n_bytes_read = 0; |
| break; |
| } |
| n_needed = MIN(end_offset - current_offset, |
| (off_t) bytes_per_block); |
| read_block(n_needed, block[idx], &n_bytes_read); |
| if (n_bytes_read < bytes_per_block) |
| break; |
| assert(n_bytes_read == bytes_per_block); |
| write_block(current_offset, n_bytes_read, |
| block[!idx], block[idx]); |
| current_offset += n_bytes_read; |
| idx = !idx; |
| } |
| } else { |
| while (1) { |
| read_block(bytes_per_block, block[idx], &n_bytes_read); |
| if (n_bytes_read < bytes_per_block) |
| break; |
| assert(n_bytes_read == bytes_per_block); |
| write_block(current_offset, n_bytes_read, |
| block[!idx], block[idx]); |
| current_offset += n_bytes_read; |
| idx = !idx; |
| } |
| } |
| |
| if (n_bytes_read > 0) { |
| int l_c_m; |
| size_t bytes_to_write; |
| |
| l_c_m = get_lcm(); |
| |
| /* Make bytes_to_write the smallest multiple of l_c_m that |
| is at least as large as n_bytes_read. */ |
| bytes_to_write = l_c_m * ((n_bytes_read + l_c_m - 1) / l_c_m); |
| |
| memset(block[idx] + n_bytes_read, 0, bytes_to_write - n_bytes_read); |
| write_block(current_offset, bytes_to_write, |
| block[!idx], block[idx]); |
| current_offset += n_bytes_read; |
| } |
| |
| format_address(current_offset, '\n'); |
| |
| if (limit_bytes_to_format && current_offset >= end_offset) |
| check_and_close(); |
| |
| free(block[0]); |
| } |
| |
| /* Read a single byte into *C from the concatenation of the input files |
| named in the global array FILE_LIST. On the first call to this |
| function, the global variable IN_STREAM is expected to be an open |
| stream associated with the input file INPUT_FILENAME. If IN_STREAM |
| is at end-of-file, close it and update the global variables IN_STREAM |
| and INPUT_FILENAME so they correspond to the next file in the list. |
| Then try to read a byte from the newly opened file. Repeat if |
| necessary until EOF is reached for the last file in FILE_LIST, then |
| set *C to EOF and return. Subsequent calls do likewise. */ |
| |
| static void |
| read_char(int *c) |
| { |
| while (in_stream) { /* !EOF */ |
| *c = fgetc(in_stream); |
| if (*c != EOF) |
| return; |
| check_and_close(); |
| open_next_file(); |
| } |
| *c = EOF; |
| } |
| |
| /* Read N bytes into BLOCK from the concatenation of the input files |
| named in the global array FILE_LIST. On the first call to this |
| function, the global variable IN_STREAM is expected to be an open |
| stream associated with the input file INPUT_FILENAME. If all N |
| bytes cannot be read from IN_STREAM, close IN_STREAM and update |
| the global variables IN_STREAM and INPUT_FILENAME. Then try to |
| read the remaining bytes from the newly opened file. Repeat if |
| necessary until EOF is reached for the last file in FILE_LIST. |
| On subsequent calls, don't modify BLOCK and return zero. Set |
| *N_BYTES_IN_BUFFER to the number of bytes read. If an error occurs, |
| it will be detected through ferror when the stream is about to be |
| closed. If there is an error, give a message but continue reading |
| as usual and return nonzero. Otherwise return zero. */ |
| |
| /* STRINGS mode. Find each "string constant" in the input. |
| A string constant is a run of at least 'string_min' ASCII |
| graphic (or formatting) characters terminated by a null. |
| Based on a function written by Richard Stallman for a |
| traditional version of od. */ |
| |
| static void |
| dump_strings(off_t address, off_t end_offset) |
| { |
| size_t bufsize = MAX(100, string_min); |
| char *buf = xmalloc(bufsize); |
| |
| while (1) { |
| size_t i; |
| int c; |
| |
| /* See if the next 'string_min' chars are all printing chars. */ |
| tryline: |
| if (limit_bytes_to_format && (end_offset - string_min <= address)) |
| break; |
| i = 0; |
| while (!limit_bytes_to_format || address < end_offset) { |
| if (i == bufsize) { |
| bufsize += bufsize/8; |
| buf = xrealloc(buf, bufsize); |
| } |
| read_char(&c); |
| if (c < 0) { /* EOF */ |
| free(buf); |
| return; |
| } |
| address++; |
| if (!c) |
| break; |
| if (!ISPRINT(c)) |
| goto tryline; /* It isn't; give up on this string. */ |
| buf[i++] = c; /* String continues; store it all. */ |
| } |
| |
| if (i < string_min) /* Too short! */ |
| goto tryline; |
| |
| /* If we get here, the string is all printable and NUL-terminated, |
| * so print it. It is all in 'buf' and 'i' is its length. */ |
| buf[i] = 0; |
| format_address(address - i - 1, ' '); |
| |
| for (i = 0; (c = buf[i]); i++) { |
| switch (c) { |
| case '\007': fputs("\\a", stdout); break; |
| case '\b': fputs("\\b", stdout); break; |
| case '\f': fputs("\\f", stdout); break; |
| case '\n': fputs("\\n", stdout); break; |
| case '\r': fputs("\\r", stdout); break; |
| case '\t': fputs("\\t", stdout); break; |
| case '\v': fputs("\\v", stdout); break; |
| default: putchar(c); |
| } |
| } |
| putchar('\n'); |
| } |
| |
| /* We reach this point only if we search through |
| (max_bytes_to_format - string_min) bytes before reaching EOF. */ |
| free(buf); |
| |
| check_and_close(); |
| } |
| |
| int od_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int od_main(int argc, char **argv) |
| { |
| static const struct suffix_mult bkm[] = { |
| { "b", 512 }, |
| { "k", 1024 }, |
| { "m", 1024*1024 }, |
| { "", 0 } |
| }; |
| enum { |
| OPT_A = 1 << 0, |
| OPT_N = 1 << 1, |
| OPT_a = 1 << 2, |
| OPT_b = 1 << 3, |
| OPT_c = 1 << 4, |
| OPT_d = 1 << 5, |
| OPT_f = 1 << 6, |
| OPT_h = 1 << 7, |
| OPT_i = 1 << 8, |
| OPT_j = 1 << 9, |
| OPT_l = 1 << 10, |
| OPT_o = 1 << 11, |
| OPT_t = 1 << 12, |
| OPT_v = 1 << 13, |
| OPT_x = 1 << 14, |
| OPT_s = 1 << 15, |
| OPT_S = 1 << 16, |
| OPT_w = 1 << 17, |
| OPT_traditional = (1 << 18) * ENABLE_LONG_OPTS, |
| }; |
| #if ENABLE_LONG_OPTS |
| static const char od_longopts[] ALIGN1 = |
| "skip-bytes\0" Required_argument "j" |
| "address-radix\0" Required_argument "A" |
| "read-bytes\0" Required_argument "N" |
| "format\0" Required_argument "t" |
| "output-duplicates\0" No_argument "v" |
| "strings\0" Optional_argument "S" |
| "width\0" Optional_argument "w" |
| "traditional\0" No_argument "\xff" |
| ; |
| #endif |
| char *str_A, *str_N, *str_j, *str_S; |
| llist_t *lst_t = NULL; |
| unsigned opt; |
| int l_c_m; |
| /* The old-style 'pseudo starting address' to be printed in parentheses |
| after any true address. */ |
| off_t pseudo_start = pseudo_start; // for gcc |
| /* The number of input bytes to skip before formatting and writing. */ |
| off_t n_bytes_to_skip = 0; |
| /* The offset of the first byte after the last byte to be formatted. */ |
| off_t end_offset = 0; |
| /* The maximum number of bytes that will be formatted. */ |
| off_t max_bytes_to_format = 0; |
| |
| spec = NULL; |
| format_address = format_address_std; |
| address_base_char = 'o'; |
| address_pad_len_char = '7'; |
| /* flag_dump_strings = 0; - already is */ |
| |
| /* Parse command line */ |
| opt_complementary = "w+:t::"; /* -w N, -t is a list */ |
| #if ENABLE_LONG_OPTS |
| applet_long_options = od_longopts; |
| #endif |
| opt = getopt32(argv, "A:N:abcdfhij:lot:vxsS:" |
| "w::", // -w with optional param |
| // -S was -s and also had optional parameter |
| // but in coreutils 6.3 it was renamed and now has |
| // _mandatory_ parameter |
| &str_A, &str_N, &str_j, &lst_t, &str_S, &bytes_per_block); |
| argc -= optind; |
| argv += optind; |
| if (opt & OPT_A) { |
| static const char doxn[] ALIGN1 = "doxn"; |
| static const char doxn_address_base_char[] ALIGN1 = { |
| 'u', 'o', 'x', /* '?' fourth one is not important */ |
| }; |
| static const uint8_t doxn_address_pad_len_char[] ALIGN1 = { |
| '7', '7', '6', /* '?' */ |
| }; |
| char *p; |
| int pos; |
| p = strchr(doxn, str_A[0]); |
| if (!p) |
| bb_error_msg_and_die("bad output address radix " |
| "'%c' (must be [doxn])", str_A[0]); |
| pos = p - doxn; |
| if (pos == 3) format_address = format_address_none; |
| address_base_char = doxn_address_base_char[pos]; |
| address_pad_len_char = doxn_address_pad_len_char[pos]; |
| } |
| if (opt & OPT_N) { |
| limit_bytes_to_format = 1; |
| max_bytes_to_format = xstrtooff_sfx(str_N, 0, bkm); |
| } |
| if (opt & OPT_a) decode_format_string("a"); |
| if (opt & OPT_b) decode_format_string("oC"); |
| if (opt & OPT_c) decode_format_string("c"); |
| if (opt & OPT_d) decode_format_string("u2"); |
| if (opt & OPT_f) decode_format_string("fF"); |
| if (opt & OPT_h) decode_format_string("x2"); |
| if (opt & OPT_i) decode_format_string("d2"); |
| if (opt & OPT_j) n_bytes_to_skip = xstrtooff_sfx(str_j, 0, bkm); |
| if (opt & OPT_l) decode_format_string("d4"); |
| if (opt & OPT_o) decode_format_string("o2"); |
| //if (opt & OPT_t)... |
| while (lst_t) { |
| decode_format_string(llist_pop(&lst_t)); |
| } |
| if (opt & OPT_v) verbose = 1; |
| if (opt & OPT_x) decode_format_string("x2"); |
| if (opt & OPT_s) decode_format_string("d2"); |
| if (opt & OPT_S) { |
| string_min = 3; |
| string_min = xstrtou_sfx(str_S, 0, bkm); |
| flag_dump_strings = 1; |
| } |
| //if (opt & OPT_w)... |
| //if (opt & OPT_traditional)... |
| |
| if (flag_dump_strings && n_specs > 0) |
| bb_error_msg_and_die("no type may be specified when dumping strings"); |
| |
| /* If the --traditional option is used, there may be from |
| * 0 to 3 remaining command line arguments; handle each case |
| * separately. |
| * od [file] [[+]offset[.][b] [[+]label[.][b]]] |
| * The offset and pseudo_start have the same syntax. |
| * |
| * FIXME: POSIX 1003.1-2001 with XSI requires support for the |
| * traditional syntax even if --traditional is not given. */ |
| |
| #if ENABLE_LONG_OPTS |
| if (opt & OPT_traditional) { |
| off_t o1, o2; |
| |
| if (argc == 1) { |
| if (parse_old_offset(argv[0], &o1)) { |
| n_bytes_to_skip = o1; |
| --argc; |
| ++argv; |
| } |
| } else if (argc == 2) { |
| if (parse_old_offset(argv[0], &o1) |
| && parse_old_offset(argv[1], &o2) |
| ) { |
| n_bytes_to_skip = o1; |
| flag_pseudo_start = 1; |
| pseudo_start = o2; |
| argv += 2; |
| argc -= 2; |
| } else if (parse_old_offset(argv[1], &o2)) { |
| n_bytes_to_skip = o2; |
| --argc; |
| argv[1] = argv[0]; |
| ++argv; |
| } else { |
| bb_error_msg_and_die("invalid second operand " |
| "in compatibility mode '%s'", argv[1]); |
| } |
| } else if (argc == 3) { |
| if (parse_old_offset(argv[1], &o1) |
| && parse_old_offset(argv[2], &o2) |
| ) { |
| n_bytes_to_skip = o1; |
| flag_pseudo_start = 1; |
| pseudo_start = o2; |
| argv[2] = argv[0]; |
| argv += 2; |
| argc -= 2; |
| } else { |
| bb_error_msg_and_die("in compatibility mode " |
| "the last two arguments must be offsets"); |
| } |
| } else if (argc > 3) { |
| bb_error_msg_and_die("compatibility mode supports " |
| "at most three arguments"); |
| } |
| |
| if (flag_pseudo_start) { |
| if (format_address == format_address_none) { |
| address_base_char = 'o'; |
| address_pad_len_char = '7'; |
| format_address = format_address_paren; |
| } else |
| format_address = format_address_label; |
| } |
| } |
| #endif |
| |
| if (limit_bytes_to_format) { |
| end_offset = n_bytes_to_skip + max_bytes_to_format; |
| if (end_offset < n_bytes_to_skip) |
| bb_error_msg_and_die("skip-bytes + read-bytes is too large"); |
| } |
| |
| if (n_specs == 0) { |
| decode_format_string("o2"); |
| n_specs = 1; |
| } |
| |
| /* If no files were listed on the command line, |
| set the global pointer FILE_LIST so that it |
| references the null-terminated list of one name: "-". */ |
| file_list = bb_argv_dash; |
| if (argc > 0) { |
| /* Set the global pointer FILE_LIST so that it |
| references the first file-argument on the command-line. */ |
| file_list = (char const *const *) argv; |
| } |
| |
| /* open the first input file */ |
| open_next_file(); |
| /* skip over any unwanted header bytes */ |
| skip(n_bytes_to_skip); |
| if (!in_stream) |
| return EXIT_FAILURE; |
| |
| pseudo_offset = (flag_pseudo_start ? pseudo_start - n_bytes_to_skip : 0); |
| |
| /* Compute output block length. */ |
| l_c_m = get_lcm(); |
| |
| if (opt & OPT_w) { /* -w: width */ |
| if (!bytes_per_block || bytes_per_block % l_c_m != 0) { |
| bb_error_msg("warning: invalid width %u; using %d instead", |
| (unsigned)bytes_per_block, l_c_m); |
| bytes_per_block = l_c_m; |
| } |
| } else { |
| bytes_per_block = l_c_m; |
| if (l_c_m < DEFAULT_BYTES_PER_BLOCK) |
| bytes_per_block *= DEFAULT_BYTES_PER_BLOCK / l_c_m; |
| } |
| |
| #ifdef DEBUG |
| for (i = 0; i < n_specs; i++) { |
| printf("%d: fmt=\"%s\" width=%d\n", |
| i, spec[i].fmt_string, width_bytes[spec[i].size]); |
| } |
| #endif |
| |
| if (flag_dump_strings) |
| dump_strings(n_bytes_to_skip, end_offset); |
| else |
| dump(n_bytes_to_skip, end_offset); |
| |
| if (fclose(stdin) == EOF) |
| bb_perror_msg_and_die(bb_msg_standard_input); |
| |
| return ioerror; |
| } |