/* 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 */ /* #include "libbb.h" - done in od.c */ #define assert(a) ((void)0) //usage:#if ENABLE_DESKTOP //usage:#define od_trivial_usage //usage: "[-abcdfhilovxs] [-t TYPE] [-A RADIX] [-N SIZE] [-j SKIP] [-S MINSTR] [-w WIDTH] [FILE]..." // We don't support: // ... [FILE] [[+]OFFSET[.][b]] // Support is buggy for: // od --traditional [OPTION]... [FILE] [[+]OFFSET[.][b] [+][LABEL][.][b]] //usage:#define od_full_usage "\n\n" //usage: "Print FILEs (or stdin) unambiguously, as octal bytes by default" //usage:#endif 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, /* 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: */ 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, }; #define OD_GETOPT32() 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) /* 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 exit_code; static unsigned 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. */ #if ENABLE_LONG_OPTS static off_t pseudo_offset; #else enum { pseudo_offset = 0 }; #endif /* 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 wins */ [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 want to share string with print_ascii. // [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; } exit_code = 1; } if ((option_mask32 & (OPT_N|OPT_S)) == OPT_N) 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] ); exit_code = 1; } fclose_if_not_stdin(in_stream); in_stream = NULL; } if (ferror(stdout)) { bb_error_msg_and_die(bb_msg_write_error); } } /* 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 NOINLINE 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 *s == NUL, p != NULL! Testcase: "od -tx" */ if (!p || *p == '\0') { 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) exit_code = 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 (!(option_mask32 & OPT_v) && !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 */ unsigned datum_width = width_bytes[spec[i].size]; unsigned blank_fields = (bytes_per_block - n_bytes) / datum_width; unsigned 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; } /* 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 (option_mask32 & OPT_N) { 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 ^ 1], block[idx]); current_offset += n_bytes_read; idx ^= 1; } } 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 ^ 1], block[idx]); current_offset += n_bytes_read; idx ^= 1; } } 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 ^ 1], block[idx]); current_offset += n_bytes_read; } format_address(current_offset, '\n'); if ((option_mask32 & OPT_N) && current_offset >= end_offset) check_and_close(); free(block[0]); } /* 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) { unsigned bufsize = MAX(100, string_min); unsigned char *buf = xmalloc(bufsize); while (1) { size_t i; int c; /* See if the next 'string_min' chars are all printing chars. */ tryline: if ((option_mask32 & OPT_N) && (end_offset - string_min <= address)) break; i = 0; while (!(option_mask32 & OPT_N) || address < end_offset) { if (i == bufsize) { bufsize += bufsize/8; buf = xrealloc(buf, bufsize); } while (in_stream) { /* !EOF */ c = fgetc(in_stream); if (c != EOF) goto got_char; check_and_close(); open_next_file(); } /* EOF */ goto ret; got_char: 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 */ 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. */ check_and_close(); ret: free(buf); } #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; if (!isdigit(s[0])) return 0; /* not a number */ /* 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 int od_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int od_main(int argc UNUSED_PARAM, char **argv) { #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" /* Yes, it's true: -S NUM, but --strings[=NUM]! * that is, NUM is mandatory for -S but optional for --strings! */ "strings\0" Optional_argument "S" "width\0" Optional_argument "w" "traditional\0" No_argument "\xff" ; #endif const char *str_A, *str_N, *str_j, *str_S = "3"; llist_t *lst_t = NULL; unsigned opt; int l_c_m; /* 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'; /* Parse command line */ opt_complementary = "w+:t::"; /* -w N, -t is a list */ #if ENABLE_LONG_OPTS applet_long_options = od_longopts; #endif opt = OD_GETOPT32(); 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) { max_bytes_to_format = xstrtooff_sfx(str_N, 0, bkm_suffixes); } 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_suffixes); if (opt & OPT_l) decode_format_string("d4"); if (opt & OPT_o) decode_format_string("o2"); while (lst_t) { decode_format_string(llist_pop(&lst_t)); } if (opt & OPT_x) decode_format_string("x2"); if (opt & OPT_s) decode_format_string("d2"); if (opt & OPT_S) { string_min = xstrtou_sfx(str_S, 0, bkm_suffixes); } // Bloat: //if ((option_mask32 & OPT_S) && 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) { if (argv[0]) { off_t pseudo_start = -1; off_t o1, o2; if (!argv[1]) { /* one arg */ if (parse_old_offset(argv[0], &o1)) { /* od --traditional OFFSET */ n_bytes_to_skip = o1; argv++; } /* od --traditional FILE */ } else if (!argv[2]) { /* two args */ if (parse_old_offset(argv[0], &o1) && parse_old_offset(argv[1], &o2) ) { /* od --traditional OFFSET LABEL */ n_bytes_to_skip = o1; pseudo_start = o2; argv += 2; } else if (parse_old_offset(argv[1], &o2)) { /* od --traditional FILE OFFSET */ n_bytes_to_skip = o2; argv[1] = NULL; } else { bb_error_msg_and_die("invalid second argument '%s'", argv[1]); } } else if (!argv[3]) { /* three args */ if (parse_old_offset(argv[1], &o1) && parse_old_offset(argv[2], &o2) ) { /* od --traditional FILE OFFSET LABEL */ n_bytes_to_skip = o1; pseudo_start = o2; argv[1] = NULL; } else { bb_error_msg_and_die("the last two arguments must be offsets"); } } else { /* >3 args */ bb_error_msg_and_die("too many arguments"); } if (pseudo_start >= 0) { 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; } pseudo_offset = pseudo_start - n_bytes_to_skip; } } /* else: od --traditional (without args) */ } #endif if (option_mask32 & OPT_N) { end_offset = n_bytes_to_skip + max_bytes_to_format; if (end_offset < n_bytes_to_skip) bb_error_msg_and_die("SKIP + SIZE is too large"); } if (n_specs == 0) { decode_format_string("o2"); /*n_specs = 1; - done by decode_format_string */ } /* 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 (argv[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; /* 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 (option_mask32 & OPT_S) dump_strings(n_bytes_to_skip, end_offset); else dump(n_bytes_to_skip, end_offset); if (fclose(stdin)) bb_perror_msg_and_die(bb_msg_standard_input); return exit_code; }