/* od -- dump files in octal and other formats
Copyright (C) 1992-2014 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 3 of the License, 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, see . */
/* Written by Jim Meyering. */
#include
#include
#include
#include
#include
#include "system.h"
#include "argmatch.h"
#include "error.h"
#include "ftoastr.h"
#include "quote.h"
#include "xfreopen.h"
#include "xprintf.h"
#include "xstrtol.h"
/* The official name of this program (e.g., no 'g' prefix). */
#define PROGRAM_NAME "od"
#define AUTHORS proper_name ("Jim Meyering")
/* The default number of input bytes per output line. */
#define DEFAULT_BYTES_PER_BLOCK 16
#if HAVE_UNSIGNED_LONG_LONG_INT
typedef unsigned long long int unsigned_long_long_int;
#else
/* This is just a place-holder to avoid a few '#if' directives.
In this case, the type isn't actually used. */
typedef unsigned long int unsigned_long_long_int;
#endif
enum size_spec
{
NO_SIZE,
CHAR,
SHORT,
INT,
LONG,
LONG_LONG,
/* FIXME: add INTMAX support, too */
FLOAT_SINGLE,
FLOAT_DOUBLE,
FLOAT_LONG_DOUBLE,
N_SIZE_SPECS
};
enum output_format
{
SIGNED_DECIMAL,
UNSIGNED_DECIMAL,
OCTAL,
HEXADECIMAL,
FLOATING_POINT,
NAMED_CHARACTER,
CHARACTER
};
#define MAX_INTEGRAL_TYPE_SIZE sizeof (unsigned_long_long_int)
/* The maximum number of bytes needed for a format string, including
the trailing nul. Each format string expects a variable amount of
padding (guaranteed to be at least 1 plus the field width), then an
element that will be formatted in the field. */
enum
{
FMT_BYTES_ALLOCATED =
(sizeof "%*.99" - 1
+ MAX (sizeof "ld",
MAX (sizeof PRIdMAX,
MAX (sizeof PRIoMAX,
MAX (sizeof PRIuMAX,
sizeof PRIxMAX)))))
};
/* Ensure that our choice for FMT_BYTES_ALLOCATED is reasonable. */
verify (MAX_INTEGRAL_TYPE_SIZE * CHAR_BIT / 3 <= 99);
/* 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; /* Type of input object. */
/* FIELDS is the number of fields per line, BLANK is the number of
fields to leave blank. WIDTH is width of one field, excluding
leading space, and PAD is total pad to divide among FIELDS.
PAD is at least as large as FIELDS. */
void (*print_function) (size_t fields, size_t blank, void const *data,
char const *fmt, int width, int pad);
char fmt_string[FMT_BYTES_ALLOCATED]; /* Of the style "%*d". */
bool hexl_mode_trailer;
int field_width; /* Minimum width of a field, excluding leading space. */
int pad_width; /* Total padding to be divided among fields. */
};
/* 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 unsigned int const bytes_to_oct_digits[] =
{0, 3, 6, 8, 11, 14, 16, 19, 22, 25, 27, 30, 32, 35, 38, 41, 43};
static unsigned int const bytes_to_signed_dec_digits[] =
{1, 4, 6, 8, 11, 13, 16, 18, 20, 23, 25, 28, 30, 33, 35, 37, 40};
static unsigned int const bytes_to_unsigned_dec_digits[] =
{0, 3, 5, 8, 10, 13, 15, 17, 20, 22, 25, 27, 29, 32, 34, 37, 39};
static unsigned int const bytes_to_hex_digits[] =
{0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32};
/* It'll be a while before we see integral types wider than 16 bytes,
but if/when it happens, this check will catch it. Without this check,
a wider type would provoke a buffer overrun. */
verify (MAX_INTEGRAL_TYPE_SIZE < ARRAY_CARDINALITY (bytes_to_hex_digits));
/* Make sure the other arrays have the same length. */
verify (sizeof bytes_to_oct_digits == sizeof bytes_to_signed_dec_digits);
verify (sizeof bytes_to_oct_digits == sizeof bytes_to_unsigned_dec_digits);
verify (sizeof bytes_to_oct_digits == sizeof bytes_to_hex_digits);
/* Convert enum size_spec to the size of the named type. */
static const int width_bytes[] =
{
-1,
sizeof (char),
sizeof (short int),
sizeof (int),
sizeof (long int),
sizeof (unsigned_long_long_int),
sizeof (float),
sizeof (double),
sizeof (long double)
};
/* Ensure that for each member of 'enum size_spec' there is an
initializer in the width_bytes array. */
verify (ARRAY_CARDINALITY (width_bytes) == N_SIZE_SPECS);
/* Names for some non-printing characters. */
static char const charname[33][4] =
{
"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"
};
/* Address base (8, 10 or 16). */
static int address_base;
/* The number of octal digits required to represent the largest
address value. */
#define MAX_ADDRESS_LENGTH \
((sizeof (uintmax_t) * CHAR_BIT + CHAR_BIT - 1) / 3)
/* Width of a normal address. */
static int address_pad_len;
/* Minimum length when detecting --strings. */
static size_t string_min;
/* True when in --strings mode. */
static bool flag_dump_strings;
/* True if we should recognize the older non-option arguments
that specified at most one file and optional arguments specifying
offset and pseudo-start address. */
static bool traditional;
/* True if an old-style 'pseudo-address' was specified. */
static bool flag_pseudo_start;
/* The difference between the old-style pseudo starting address and
the number of bytes to skip. */
static uintmax_t pseudo_offset;
/* Function that accepts an address and an optional following char,
and prints the address and char to stdout. */
static void (*format_address) (uintmax_t, char);
/* The number of input bytes to skip before formatting and writing. */
static uintmax_t n_bytes_to_skip = 0;
/* When false, MAX_BYTES_TO_FORMAT and END_OFFSET are ignored, and all
input is formatted. */
static bool limit_bytes_to_format = false;
/* The maximum number of bytes that will be formatted. */
static uintmax_t max_bytes_to_format;
/* The offset of the first byte after the last byte to be formatted. */
static uintmax_t end_offset;
/* When true 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 bool abbreviate_duplicate_blocks = true;
/* An array of specs describing how to format each input block. */
static struct tspec *spec;
/* The number of format specs. */
static size_t n_specs;
/* The allocated length of SPEC. */
static size_t n_specs_allocated;
/* 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 size_t bytes_per_block;
/* Human-readable representation of *file_list (for error messages).
It differs from file_list[-1] only when file_list[-1] is "-". */
static char const *input_filename;
/* A NULL-terminated list of the file-arguments from the command line. */
static char const *const *file_list;
/* Initializer for file_list if no file-arguments
were specified on the command line. */
static char const *const default_file_list[] = {"-", NULL};
/* The input stream associated with the current file. */
static FILE *in_stream;
/* If true, at least one of the files we read was standard input. */
static bool have_read_stdin;
/* Map the size in bytes to a type identifier. */
static enum size_spec integral_type_size[MAX_INTEGRAL_TYPE_SIZE + 1];
#define MAX_FP_TYPE_SIZE sizeof (long double)
static enum size_spec fp_type_size[MAX_FP_TYPE_SIZE + 1];
#ifndef WORDS_BIGENDIAN
# define WORDS_BIGENDIAN 0
#endif
/* Use native endianess by default. */
static bool input_swap;
static char const short_options[] = "A:aBbcDdeFfHhIij:LlN:OoS:st:vw::Xx";
/* For long options that have no equivalent short option, use a
non-character as a pseudo short option, starting with CHAR_MAX + 1. */
enum
{
TRADITIONAL_OPTION = CHAR_MAX + 1,
ENDIAN_OPTION,
};
enum endian_type
{
endian_little,
endian_big
};
static char const *const endian_args[] =
{
"little", "big", NULL
};
static enum endian_type const endian_types[] =
{
endian_little, endian_big
};
static struct option const long_options[] =
{
{"skip-bytes", required_argument, NULL, 'j'},
{"address-radix", required_argument, NULL, 'A'},
{"read-bytes", required_argument, NULL, 'N'},
{"format", required_argument, NULL, 't'},
{"output-duplicates", no_argument, NULL, 'v'},
{"strings", optional_argument, NULL, 'S'},
{"traditional", no_argument, NULL, TRADITIONAL_OPTION},
{"width", optional_argument, NULL, 'w'},
{"endian", required_argument, NULL, ENDIAN_OPTION },
{GETOPT_HELP_OPTION_DECL},
{GETOPT_VERSION_OPTION_DECL},
{NULL, 0, NULL, 0}
};
void
usage (int status)
{
if (status != EXIT_SUCCESS)
emit_try_help ();
else
{
printf (_("\
Usage: %s [OPTION]... [FILE]...\n\
or: %s [-abcdfilosx]... [FILE] [[+]OFFSET[.][b]]\n\
or: %s --traditional [OPTION]... [FILE] [[+]OFFSET[.][b] [+][LABEL][.][b]]\n\
"),
program_name, program_name, program_name);
fputs (_("\n\
Write an unambiguous representation, octal bytes by default,\n\
of FILE to standard output. With more than one FILE argument,\n\
concatenate them in the listed order to form the input.\n\
With no FILE, or when FILE is -, read standard input.\n\
\n\
"), stdout);
fputs (_("\
If first and second call formats both apply, the second format is assumed\n\
if the last operand begins with + or (if there are 2 operands) a digit.\n\
An OFFSET operand means -j OFFSET. LABEL is the pseudo-address\n\
at first byte printed, incremented when dump is progressing.\n\
For OFFSET and LABEL, a 0x or 0X prefix indicates hexadecimal;\n\
suffixes may be . for octal and b for multiply by 512.\n\
"), stdout);
emit_mandatory_arg_note ();
fputs (_("\
-A, --address-radix=RADIX output format for file offsets; RADIX is one\n\
of [doxn], for Decimal, Octal, Hex or None\n\
--endian={big|little} swap input bytes according the specified order\n\
-j, --skip-bytes=BYTES skip BYTES input bytes first\n\
"), stdout);
fputs (_("\
-N, --read-bytes=BYTES limit dump to BYTES input bytes\n\
-S BYTES, --strings[=BYTES] output strings of at least BYTES graphic chars;\
\n\
3 is implied when BYTES is not specified\n\
-t, --format=TYPE select output format or formats\n\
-v, --output-duplicates do not use * to mark line suppression\n\
-w[BYTES], --width[=BYTES] output BYTES bytes per output line;\n\
32 is implied when BYTES is not specified\n\
--traditional accept arguments in third form above\n\
"), stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
fputs (_("\
\n\
\n\
Traditional format specifications may be intermixed; they accumulate:\n\
-a same as -t a, select named characters, ignoring high-order bit\n\
-b same as -t o1, select octal bytes\n\
-c same as -t c, select printable characters or backslash escapes\n\
-d same as -t u2, select unsigned decimal 2-byte units\n\
"), stdout);
fputs (_("\
-f same as -t fF, select floats\n\
-i same as -t dI, select decimal ints\n\
-l same as -t dL, select decimal longs\n\
-o same as -t o2, select octal 2-byte units\n\
-s same as -t d2, select decimal 2-byte units\n\
-x same as -t x2, select hexadecimal 2-byte units\n\
"), stdout);
fputs (_("\
\n\
\n\
TYPE is made up of one or more of these specifications:\n\
a named character, ignoring high-order bit\n\
c printable character or backslash escape\n\
"), stdout);
fputs (_("\
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\
"), stdout);
fputs (_("\
\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\
"), stdout);
fputs (_("\
\n\
Adding a z suffix to any type displays printable characters at the end of\n\
each output line.\n\
"), stdout);
fputs (_("\
\n\
\n\
BYTES is hex with 0x or 0X prefix, and may have a multiplier suffix:\n\
b 512\n\
KB 1000\n\
K 1024\n\
MB 1000*1000\n\
M 1024*1024\n\
and so on for G, T, P, E, Z, Y.\n\
"), stdout);
emit_ancillary_info (PROGRAM_NAME);
}
exit (status);
}
/* Define the print functions. */
#define PRINT_FIELDS(N, T, FMT_STRING, ACTION) \
static void \
N (size_t fields, size_t blank, void const *block, \
char const *FMT_STRING, int width, int pad) \
{ \
T const *p = block; \
uintmax_t i; \
int pad_remaining = pad; \
for (i = fields; blank < i; i--) \
{ \
int next_pad = pad * (i - 1) / fields; \
int adjusted_width = pad_remaining - next_pad + width; \
T x; \
if (input_swap && sizeof (T) > 1) \
{ \
size_t j; \
union { \
T x; \
char b[sizeof (T)]; \
} u; \
for (j = 0; j < sizeof (T); j++) \
u.b[j] = ((const char *) p)[sizeof (T) - 1 - j]; \
x = u.x; \
} \
else \
x = *p; \
p++; \
ACTION; \
pad_remaining = next_pad; \
} \
}
#define PRINT_TYPE(N, T) \
PRINT_FIELDS (N, T, fmt_string, xprintf (fmt_string, adjusted_width, x))
#define PRINT_FLOATTYPE(N, T, FTOASTR, BUFSIZE) \
PRINT_FIELDS (N, T, fmt_string _GL_UNUSED, \
char buf[BUFSIZE]; \
FTOASTR (buf, sizeof buf, 0, 0, x); \
xprintf ("%*s", adjusted_width, buf))
PRINT_TYPE (print_s_char, signed char)
PRINT_TYPE (print_char, unsigned char)
PRINT_TYPE (print_s_short, short int)
PRINT_TYPE (print_short, unsigned short int)
PRINT_TYPE (print_int, unsigned int)
PRINT_TYPE (print_long, unsigned long int)
PRINT_TYPE (print_long_long, unsigned_long_long_int)
PRINT_FLOATTYPE (print_float, float, ftoastr, FLT_BUFSIZE_BOUND)
PRINT_FLOATTYPE (print_double, double, dtoastr, DBL_BUFSIZE_BOUND)
PRINT_FLOATTYPE (print_long_double, long double, ldtoastr, LDBL_BUFSIZE_BOUND)
#undef PRINT_TYPE
#undef PRINT_FLOATTYPE
static void
dump_hexl_mode_trailer (size_t n_bytes, const char *block)
{
size_t i;
fputs (" >", stdout);
for (i = n_bytes; i > 0; i--)
{
unsigned char c = *block++;
unsigned char c2 = (isprint (c) ? c : '.');
putchar (c2);
}
putchar ('<');
}
static void
print_named_ascii (size_t fields, size_t blank, void const *block,
const char *unused_fmt_string _GL_UNUSED,
int width, int pad)
{
unsigned char const *p = block;
uintmax_t i;
int pad_remaining = pad;
for (i = fields; blank < i; i--)
{
int next_pad = pad * (i - 1) / fields;
int masked_c = *p++ & 0x7f;
const char *s;
char buf[2];
if (masked_c == 127)
s = "del";
else if (masked_c <= 040)
s = charname[masked_c];
else
{
buf[0] = masked_c;
buf[1] = 0;
s = buf;
}
xprintf ("%*s", pad_remaining - next_pad + width, s);
pad_remaining = next_pad;
}
}
static void
print_ascii (size_t fields, size_t blank, void const *block,
const char *unused_fmt_string _GL_UNUSED, int width,
int pad)
{
unsigned char const *p = block;
uintmax_t i;
int pad_remaining = pad;
for (i = fields; blank < i; i--)
{
int next_pad = pad * (i - 1) / fields;
unsigned char c = *p++;
const char *s;
char buf[4];
switch (c)
{
case '\0':
s = "\\0";
break;
case '\a':
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;
default:
sprintf (buf, (isprint (c) ? "%c" : "%03o"), c);
s = buf;
}
xprintf ("%*s", pad_remaining - next_pad + width, s);
pad_remaining = next_pad;
}
}
/* Convert a null-terminated (possibly zero-length) string S to an
unsigned long integer value. If S points to a non-digit set *P to S,
*VAL to 0, and return true. Otherwise, accumulate the integer value of
the string of digits. If the string of digits represents a value
larger than ULONG_MAX, don't modify *VAL or *P and return false.
Otherwise, advance *P to the first non-digit after S, set *VAL to
the result of the conversion and return true. */
static bool
simple_strtoul (const char *s, const char **p, unsigned long int *val)
{
unsigned long int sum;
sum = 0;
while (ISDIGIT (*s))
{
int c = *s++ - '0';
if (sum > (ULONG_MAX - c) / 10)
return false;
sum = sum * 10 + c;
}
*p = s;
*val = sum;
return true;
}
/* If S points to a single valid modern od format string, put
a description of that format in *TSPEC, make *NEXT point at the
character following the just-decoded format (if *NEXT is non-NULL),
and return true. If S is not valid, don't modify *NEXT or *TSPEC,
give a diagnostic, and return false. For example, if S were
"d4afL" *NEXT would be set 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)
field_width = 11;
fmt_string = "%*d";
}
pad_width is determined later, but is at least as large as the
number of fields printed per row.
S_ORIG is solely for reporting errors. It should be the full format
string argument.
*/
static bool
decode_one_format (const char *s_orig, const char *s, const char **next,
struct tspec *tspec)
{
enum size_spec size_spec;
unsigned long int size;
enum output_format fmt;
void (*print_function) (size_t, size_t, void const *, char const *,
int, int);
const char *p;
char c;
int field_width;
assert (tspec != NULL);
switch (*s)
{
case 'd':
case 'o':
case 'u':
case 'x':
c = *s;
++s;
switch (*s)
{
case 'C':
++s;
size = sizeof (char);
break;
case 'S':
++s;
size = sizeof (short int);
break;
case 'I':
++s;
size = sizeof (int);
break;
case 'L':
++s;
size = sizeof (long int);
break;
default:
if (! simple_strtoul (s, &p, &size))
{
/* The integer at P in S would overflow an unsigned long int.
A digit string that long is sufficiently odd looking
that the following diagnostic is sufficient. */
error (0, 0, _("invalid type string %s"), quote (s_orig));
return false;
}
if (p == s)
size = sizeof (int);
else
{
if (MAX_INTEGRAL_TYPE_SIZE < size
|| integral_type_size[size] == NO_SIZE)
{
error (0, 0, _("invalid type string %s;\nthis system"
" doesn't provide a %lu-byte integral type"),
quote (s_orig), size);
return false;
}
s = p;
}
break;
}
#define ISPEC_TO_FORMAT(Spec, Min_format, Long_format, Max_format) \
((Spec) == LONG_LONG ? (Max_format) \
: ((Spec) == LONG ? (Long_format) \
: (Min_format))) \
size_spec = integral_type_size[size];
switch (c)
{
case 'd':
fmt = SIGNED_DECIMAL;
field_width = bytes_to_signed_dec_digits[size];
sprintf (tspec->fmt_string, "%%*%s",
ISPEC_TO_FORMAT (size_spec, "d", "ld", PRIdMAX));
break;
case 'o':
fmt = OCTAL;
sprintf (tspec->fmt_string, "%%*.%d%s",
(field_width = bytes_to_oct_digits[size]),
ISPEC_TO_FORMAT (size_spec, "o", "lo", PRIoMAX));
break;
case 'u':
fmt = UNSIGNED_DECIMAL;
field_width = bytes_to_unsigned_dec_digits[size];
sprintf (tspec->fmt_string, "%%*%s",
ISPEC_TO_FORMAT (size_spec, "u", "lu", PRIuMAX));
break;
case 'x':
fmt = HEXADECIMAL;
sprintf (tspec->fmt_string, "%%*.%d%s",
(field_width = bytes_to_hex_digits[size]),
ISPEC_TO_FORMAT (size_spec, "x", "lx", PRIxMAX));
break;
default:
abort ();
}
assert (strlen (tspec->fmt_string) < FMT_BYTES_ALLOCATED);
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;
case LONG_LONG:
print_function = print_long_long;
break;
default:
abort ();
}
break;
case 'f':
fmt = FLOATING_POINT;
++s;
switch (*s)
{
case 'F':
++s;
size = sizeof (float);
break;
case 'D':
++s;
size = sizeof (double);
break;
case 'L':
++s;
size = sizeof (long double);
break;
default:
if (! simple_strtoul (s, &p, &size))
{
/* The integer at P in S would overflow an unsigned long int.
A digit string that long is sufficiently odd looking
that the following diagnostic is sufficient. */
error (0, 0, _("invalid type string %s"), quote (s_orig));
return false;
}
if (p == s)
size = sizeof (double);
else
{
if (size > MAX_FP_TYPE_SIZE
|| fp_type_size[size] == NO_SIZE)
{
error (0, 0,
_("invalid type string %s;\n"
"this system doesn't provide a %lu-byte"
" floating point type"),
quote (s_orig), size);
return false;
}
s = p;
}
break;
}
size_spec = fp_type_size[size];
{
struct lconv const *locale = localeconv ();
size_t decimal_point_len =
(locale->decimal_point[0] ? strlen (locale->decimal_point) : 1);
switch (size_spec)
{
case FLOAT_SINGLE:
print_function = print_float;
field_width = FLT_STRLEN_BOUND_L (decimal_point_len);
break;
case FLOAT_DOUBLE:
print_function = print_double;
field_width = DBL_STRLEN_BOUND_L (decimal_point_len);
break;
case FLOAT_LONG_DOUBLE:
print_function = print_long_double;
field_width = LDBL_STRLEN_BOUND_L (decimal_point_len);
break;
default:
abort ();
}
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:
error (0, 0, _("invalid character '%c' in type string %s"),
*s, quote (s_orig));
return false;
}
tspec->size = size_spec;
tspec->fmt = fmt;
tspec->print_function = print_function;
tspec->field_width = field_width;
tspec->hexl_mode_trailer = (*s == 'z');
if (tspec->hexl_mode_trailer)
s++;
if (next != NULL)
*next = s;
return true;
}
/* 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 false. */
static bool
open_next_file (void)
{
bool ok = true;
do
{
input_filename = *file_list;
if (input_filename == NULL)
return ok;
++file_list;
if (STREQ (input_filename, "-"))
{
input_filename = _("standard input");
in_stream = stdin;
have_read_stdin = true;
if (O_BINARY && ! isatty (STDIN_FILENO))
xfreopen (NULL, "rb", stdin);
}
else
{
in_stream = fopen (input_filename, (O_BINARY ? "rb" : "r"));
if (in_stream == NULL)
{
error (0, errno, "%s", input_filename);
ok = false;
}
}
}
while (in_stream == NULL);
if (limit_bytes_to_format && !flag_dump_strings)
setvbuf (in_stream, NULL, _IONBF, 0);
return ok;
}
/* Test whether there have been errors on in_stream, and close it if
it is not standard input. Return false if there has been an error
on in_stream or stdout; return true 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 bool
check_and_close (int in_errno)
{
bool ok = true;
if (in_stream != NULL)
{
if (ferror (in_stream))
{
error (0, in_errno, _("%s: read error"), input_filename);
if (! STREQ (file_list[-1], "-"))
fclose (in_stream);
ok = false;
}
else if (! STREQ (file_list[-1], "-") && fclose (in_stream) != 0)
{
error (0, errno, "%s", input_filename);
ok = false;
}
in_stream = NULL;
}
if (ferror (stdout))
{
error (0, 0, _("write error"));
ok = false;
}
return ok;
}
/* Decode the modern od format string S. Append the decoded
representation to the global array SPEC, reallocating SPEC if
necessary. Return true if S is valid. */
static bool
decode_format_string (const char *s)
{
const char *s_orig = s;
assert (s != NULL);
while (*s != '\0')
{
const char *next;
if (n_specs_allocated <= n_specs)
spec = X2NREALLOC (spec, &n_specs_allocated);
if (! decode_one_format (s_orig, s, &next, &spec[n_specs]))
return false;
assert (s != next);
s = next;
++n_specs;
}
return true;
}
/* 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
false. When possible, use seek rather than read operations to
advance IN_STREAM. */
static bool
skip (uintmax_t n_skip)
{
bool ok = true;
int in_errno = 0;
if (n_skip == 0)
return true;
while (in_stream != NULL) /* 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. */
if (fstat (fileno (in_stream), &file_stats) == 0)
{
/* The st_size field is valid for regular files.
If the number of bytes left to skip is larger than
the size of the current file, we can decrement n_skip
and go on to the next file. Skip this optimization also
when st_size is 0, because some kernels report that
nonempty files in /proc have st_size == 0. */
if (S_ISREG (file_stats.st_mode) && 0 < file_stats.st_size)
{
if ((uintmax_t) file_stats.st_size < n_skip)
n_skip -= file_stats.st_size;
else
{
if (fseeko (in_stream, n_skip, SEEK_CUR) != 0)
{
in_errno = errno;
ok = false;
}
n_skip = 0;
}
}
/* If it's not a regular file with nonnegative size,
position the file pointer by reading. */
else
{
char buf[BUFSIZ];
size_t n_bytes_read, n_bytes_to_read = BUFSIZ;
while (0 < n_skip)
{
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)
{
in_errno = errno;
ok = false;
n_skip = 0;
break;
}
}
}
if (n_skip == 0)
break;
}
else /* cannot fstat() file */
{
error (0, errno, "%s", input_filename);
ok = false;
}
ok &= check_and_close (in_errno);
ok &= open_next_file ();
}
if (n_skip != 0)
error (EXIT_FAILURE, 0, _("cannot skip past end of combined input"));
return ok;
}
static void
format_address_none (uintmax_t address _GL_UNUSED,
char c _GL_UNUSED)
{
}
static void
format_address_std (uintmax_t address, char c)
{
char buf[MAX_ADDRESS_LENGTH + 2];
char *p = buf + sizeof buf;
char const *pbound;
*--p = '\0';
*--p = c;
pbound = p - address_pad_len;
/* Use a special case of the code for each base. This is measurably
faster than generic code. */
switch (address_base)
{
case 8:
do
*--p = '0' + (address & 7);
while ((address >>= 3) != 0);
break;
case 10:
do
*--p = '0' + (address % 10);
while ((address /= 10) != 0);
break;
case 16:
do
*--p = "0123456789abcdef"[address & 15];
while ((address >>= 4) != 0);
break;
}
while (pbound < p)
*--p = '0';
fputs (p, stdout);
}
static void
format_address_paren (uintmax_t address, char c)
{
putchar ('(');
format_address_std (address, ')');
if (c)
putchar (c);
}
static void
format_address_label (uintmax_t address, char c)
{
format_address_std (address, ' ');
format_address_paren (address + pseudo_offset, c);
}
/* 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. */
static void
write_block (uintmax_t current_offset, size_t n_bytes,
const char *prev_block, const char *curr_block)
{
static bool first = true;
static bool prev_pair_equal = false;
#define EQUAL_BLOCKS(b1, b2) (memcmp (b1, b2, bytes_per_block) == 0)
if (abbreviate_duplicate_blocks
&& !first && n_bytes == bytes_per_block
&& EQUAL_BLOCKS (prev_block, curr_block))
{
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
{
printf ("*\n");
prev_pair_equal = true;
}
}
else
{
size_t i;
prev_pair_equal = false;
for (i = 0; i < n_specs; i++)
{
int datum_width = width_bytes[spec[i].size];
int fields_per_block = bytes_per_block / datum_width;
int blank_fields = (bytes_per_block - n_bytes) / datum_width;
if (i == 0)
format_address (current_offset, '\0');
else
printf ("%*s", address_pad_len, "");
(*spec[i].print_function) (fields_per_block, blank_fields,
curr_block, spec[i].fmt_string,
spec[i].field_width, spec[i].pad_width);
if (spec[i].hexl_mode_trailer)
{
/* space-pad out to full line width, then dump the trailer */
int field_width = spec[i].field_width;
int pad_width = (spec[i].pad_width * blank_fields
/ fields_per_block);
printf ("%*s", blank_fields * field_width + pad_width, "");
dump_hexl_mode_trailer (n_bytes, curr_block);
}
putchar ('\n');
}
}
first = false;
}
/* 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. Return
true if successful. */
static bool
read_char (int *c)
{
bool ok = true;
*c = EOF;
while (in_stream != NULL) /* EOF. */
{
*c = fgetc (in_stream);
if (*c != EOF)
break;
ok &= check_and_close (errno);
ok &= open_next_file ();
}
return ok;
}
/* 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 true. 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 false. Otherwise return true. */
static bool
read_block (size_t n, char *block, size_t *n_bytes_in_buffer)
{
bool ok = true;
assert (0 < n && n <= bytes_per_block);
*n_bytes_in_buffer = 0;
if (n == 0)
return true;
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;
ok &= check_and_close (errno);
ok &= open_next_file ();
}
return ok;
}
/* Return the least common multiple of the sizes associated
with the format specs. */
static int _GL_ATTRIBUTE_PURE
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[spec[i].size]);
return l_c_m;
}
/* If S is a valid traditional offset specification with an optional
leading '+' return true and set *OFFSET to the offset it denotes. */
static bool
parse_old_offset (const char *s, uintmax_t *offset)
{
int radix;
if (*s == '\0')
return false;
/* 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. */
if (strchr (s, '.') != NULL)
radix = 10;
else
{
if (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'))
radix = 16;
else
radix = 8;
}
return xstrtoumax (s, NULL, radix, offset, "Bb") == LONGINT_OK;
}
/* 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. Accumulate return values from calls to read_block and
check_and_close, and if any was false, return false.
Otherwise, return true. */
static bool
dump (void)
{
char *block[2];
uintmax_t current_offset;
bool idx = false;
bool ok = true;
size_t n_bytes_read;
block[0] = xnmalloc (2, bytes_per_block);
block[1] = block[0] + bytes_per_block;
current_offset = n_bytes_to_skip;
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,
(uintmax_t) bytes_per_block);
ok &= 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)
{
ok &= 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 ();
/* Ensure zero-byte padding up to 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, n_bytes_read, block[!idx], block[idx]);
current_offset += n_bytes_read;
}
format_address (current_offset, '\n');
if (limit_bytes_to_format && current_offset >= end_offset)
ok &= check_and_close (0);
free (block[0]);
return ok;
}
/* 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. Return true if successful. */
static bool
dump_strings (void)
{
size_t bufsize = MAX (100, string_min);
char *buf = xmalloc (bufsize);
uintmax_t address = n_bytes_to_skip;
bool ok = true;
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 || end_offset - string_min <= address))
break;
for (i = 0; i < string_min; i++)
{
ok &= read_char (&c);
address++;
if (c < 0)
{
free (buf);
return ok;
}
if (! isprint (c))
/* Found a non-printing. Try again starting with next char. */
goto tryline;
buf[i] = c;
}
/* We found a run of 'string_min' printable characters.
Now see if it is terminated with a null byte. */
while (!limit_bytes_to_format || address < end_offset)
{
if (i == bufsize)
{
buf = X2REALLOC (buf, &bufsize);
}
ok &= read_char (&c);
address++;
if (c < 0)
{
free (buf);
return ok;
}
if (c == '\0')
break; /* It is; print this string. */
if (! isprint (c))
goto tryline; /* It isn't; give up on this string. */
buf[i++] = c; /* String continues; store it all. */
}
/* If we get here, the string is all printable and null-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 '\a':
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:
putc (c, stdout);
}
}
putchar ('\n');
}
/* We reach this point only if we search through
(max_bytes_to_format - string_min) bytes before reaching EOF. */
free (buf);
ok &= check_and_close (0);
return ok;
}
int
main (int argc, char **argv)
{
int n_files;
size_t i;
int l_c_m;
size_t desired_width IF_LINT ( = 0);
bool modern = false;
bool width_specified = false;
bool ok = true;
size_t width_per_block = 0;
static char const multipliers[] = "bEGKkMmPTYZ0";
/* The old-style 'pseudo starting address' to be printed in parentheses
after any true address. */
uintmax_t pseudo_start IF_LINT ( = 0);
initialize_main (&argc, &argv);
set_program_name (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
for (i = 0; i <= MAX_INTEGRAL_TYPE_SIZE; i++)
integral_type_size[i] = NO_SIZE;
integral_type_size[sizeof (char)] = CHAR;
integral_type_size[sizeof (short int)] = SHORT;
integral_type_size[sizeof (int)] = INT;
integral_type_size[sizeof (long int)] = LONG;
#if HAVE_UNSIGNED_LONG_LONG_INT
/* If 'long int' and 'long long int' have the same size, it's fine
to overwrite the entry for 'long' with this one. */
integral_type_size[sizeof (unsigned_long_long_int)] = LONG_LONG;
#endif
for (i = 0; i <= MAX_FP_TYPE_SIZE; i++)
fp_type_size[i] = NO_SIZE;
fp_type_size[sizeof (float)] = FLOAT_SINGLE;
/* The array entry for 'double' is filled in after that for 'long double'
so that if they are the same size, we avoid any overhead of
long double computation in libc. */
fp_type_size[sizeof (long double)] = FLOAT_LONG_DOUBLE;
fp_type_size[sizeof (double)] = FLOAT_DOUBLE;
n_specs = 0;
n_specs_allocated = 0;
spec = NULL;
format_address = format_address_std;
address_base = 8;
address_pad_len = 7;
flag_dump_strings = false;
while (true)
{
uintmax_t tmp;
enum strtol_error s_err;
int oi = -1;
int c = getopt_long (argc, argv, short_options, long_options, &oi);
if (c == -1)
break;
switch (c)
{
case 'A':
modern = true;
switch (optarg[0])
{
case 'd':
format_address = format_address_std;
address_base = 10;
address_pad_len = 7;
break;
case 'o':
format_address = format_address_std;
address_base = 8;
address_pad_len = 7;
break;
case 'x':
format_address = format_address_std;
address_base = 16;
address_pad_len = 6;
break;
case 'n':
format_address = format_address_none;
address_pad_len = 0;
break;
default:
error (EXIT_FAILURE, 0,
_("invalid output address radix '%c';\
it must be one character from [doxn]"),
optarg[0]);
break;
}
break;
case 'j':
modern = true;
s_err = xstrtoumax (optarg, NULL, 0, &n_bytes_to_skip, multipliers);
if (s_err != LONGINT_OK)
xstrtol_fatal (s_err, oi, c, long_options, optarg);
break;
case 'N':
modern = true;
limit_bytes_to_format = true;
s_err = xstrtoumax (optarg, NULL, 0, &max_bytes_to_format,
multipliers);
if (s_err != LONGINT_OK)
xstrtol_fatal (s_err, oi, c, long_options, optarg);
break;
case 'S':
modern = true;
if (optarg == NULL)
string_min = 3;
else
{
s_err = xstrtoumax (optarg, NULL, 0, &tmp, multipliers);
if (s_err != LONGINT_OK)
xstrtol_fatal (s_err, oi, c, long_options, optarg);
/* The minimum string length may be no larger than SIZE_MAX,
since we may allocate a buffer of this size. */
if (SIZE_MAX < tmp)
error (EXIT_FAILURE, 0, _("%s is too large"), optarg);
string_min = tmp;
}
flag_dump_strings = true;
break;
case 't':
modern = true;
ok &= decode_format_string (optarg);
break;
case 'v':
modern = true;
abbreviate_duplicate_blocks = false;
break;
case TRADITIONAL_OPTION:
traditional = true;
break;
case ENDIAN_OPTION:
switch (XARGMATCH ("--endian", optarg, endian_args, endian_types))
{
case endian_big:
input_swap = ! WORDS_BIGENDIAN;
break;
case endian_little:
input_swap = WORDS_BIGENDIAN;
break;
}
break;
/* The next several cases map the traditional format
specification options to the corresponding modern format
specs. GNU od accepts any combination of old- and
new-style options. Format specification options accumulate.
The obsolescent and undocumented formats are compatible
with FreeBSD 4.10 od. */
#define CASE_OLD_ARG(old_char,new_string) \
case old_char: \
ok &= decode_format_string (new_string); \
break
CASE_OLD_ARG ('a', "a");
CASE_OLD_ARG ('b', "o1");
CASE_OLD_ARG ('c', "c");
CASE_OLD_ARG ('D', "u4"); /* obsolescent and undocumented */
CASE_OLD_ARG ('d', "u2");
case 'F': /* obsolescent and undocumented alias */
CASE_OLD_ARG ('e', "fD"); /* obsolescent and undocumented */
CASE_OLD_ARG ('f', "fF");
case 'X': /* obsolescent and undocumented alias */
CASE_OLD_ARG ('H', "x4"); /* obsolescent and undocumented */
CASE_OLD_ARG ('i', "dI");
case 'I': case 'L': /* obsolescent and undocumented aliases */
CASE_OLD_ARG ('l', "dL");
CASE_OLD_ARG ('O', "o4"); /* obsolesent and undocumented */
case 'B': /* obsolescent and undocumented alias */
CASE_OLD_ARG ('o', "o2");
CASE_OLD_ARG ('s', "d2");
case 'h': /* obsolescent and undocumented alias */
CASE_OLD_ARG ('x', "x2");
#undef CASE_OLD_ARG
case 'w':
modern = true;
width_specified = true;
if (optarg == NULL)
{
desired_width = 32;
}
else
{
uintmax_t w_tmp;
s_err = xstrtoumax (optarg, NULL, 10, &w_tmp, "");
if (s_err != LONGINT_OK)
xstrtol_fatal (s_err, oi, c, long_options, optarg);
if (SIZE_MAX < w_tmp)
error (EXIT_FAILURE, 0, _("%s is too large"), optarg);
desired_width = w_tmp;
}
break;
case_GETOPT_HELP_CHAR;
case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
default:
usage (EXIT_FAILURE);
break;
}
}
if (!ok)
return EXIT_FAILURE;
if (flag_dump_strings && n_specs > 0)
error (EXIT_FAILURE, 0,
_("no type may be specified when dumping strings"));
n_files = argc - optind;
/* 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 label have the same syntax.
If --traditional is not given, and if no modern options are
given, and if the offset begins with + or (if there are two
operands) a digit, accept only this form, as per POSIX:
od [file] [[+]offset[.][b]]
*/
if (!modern || traditional)
{
uintmax_t o1;
uintmax_t o2;
switch (n_files)
{
case 1:
if ((traditional || argv[optind][0] == '+')
&& parse_old_offset (argv[optind], &o1))
{
n_bytes_to_skip = o1;
--n_files;
++argv;
}
break;
case 2:
if ((traditional || argv[optind + 1][0] == '+'
|| ISDIGIT (argv[optind + 1][0]))
&& parse_old_offset (argv[optind + 1], &o2))
{
if (traditional && parse_old_offset (argv[optind], &o1))
{
n_bytes_to_skip = o1;
flag_pseudo_start = true;
pseudo_start = o2;
argv += 2;
n_files -= 2;
}
else
{
n_bytes_to_skip = o2;
--n_files;
argv[optind + 1] = argv[optind];
++argv;
}
}
break;
case 3:
if (traditional
&& parse_old_offset (argv[optind + 1], &o1)
&& parse_old_offset (argv[optind + 2], &o2))
{
n_bytes_to_skip = o1;
flag_pseudo_start = true;
pseudo_start = o2;
argv[optind + 2] = argv[optind];
argv += 2;
n_files -= 2;
}
break;
}
if (traditional && 1 < n_files)
{
error (0, 0, _("extra operand %s"), quote (argv[optind + 1]));
error (0, 0, "%s",
_("compatibility mode supports at most one file"));
usage (EXIT_FAILURE);
}
}
if (flag_pseudo_start)
{
if (format_address == format_address_none)
{
address_base = 8;
address_pad_len = 7;
format_address = format_address_paren;
}
else
format_address = format_address_label;
}
if (limit_bytes_to_format)
{
end_offset = n_bytes_to_skip + max_bytes_to_format;
if (end_offset < n_bytes_to_skip)
error (EXIT_FAILURE, 0, _("skip-bytes + read-bytes is too large"));
}
if (n_specs == 0)
decode_format_string ("oS");
if (n_files > 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[optind];
}
else
{
/* 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 = default_file_list;
}
/* open the first input file */
ok = open_next_file ();
if (in_stream == NULL)
goto cleanup;
/* skip over any unwanted header bytes */
ok &= skip (n_bytes_to_skip);
if (in_stream == NULL)
goto cleanup;
pseudo_offset = (flag_pseudo_start ? pseudo_start - n_bytes_to_skip : 0);
/* Compute output block length. */
l_c_m = get_lcm ();
if (width_specified)
{
if (desired_width != 0 && desired_width % l_c_m == 0)
bytes_per_block = desired_width;
else
{
error (0, 0, _("warning: invalid width %lu; using %d instead"),
(unsigned long int) desired_width, l_c_m);
bytes_per_block = l_c_m;
}
}
else
{
if (l_c_m < DEFAULT_BYTES_PER_BLOCK)
bytes_per_block = l_c_m * (DEFAULT_BYTES_PER_BLOCK / l_c_m);
else
bytes_per_block = l_c_m;
}
/* Compute padding necessary to align output block. */
for (i = 0; i < n_specs; i++)
{
int fields_per_block = bytes_per_block / width_bytes[spec[i].size];
int block_width = (spec[i].field_width + 1) * fields_per_block;
if (width_per_block < block_width)
width_per_block = block_width;
}
for (i = 0; i < n_specs; i++)
{
int fields_per_block = bytes_per_block / width_bytes[spec[i].size];
int block_width = spec[i].field_width * fields_per_block;
spec[i].pad_width = width_per_block - block_width;
}
#ifdef DEBUG
printf ("lcm=%d, width_per_block=%zu\n", l_c_m, width_per_block);
for (i = 0; i < n_specs; i++)
{
int fields_per_block = bytes_per_block / width_bytes[spec[i].size];
assert (bytes_per_block % width_bytes[spec[i].size] == 0);
assert (1 <= spec[i].pad_width / fields_per_block);
printf ("%d: fmt=\"%s\" in_width=%d out_width=%d pad=%d\n",
i, spec[i].fmt_string, width_bytes[spec[i].size],
spec[i].field_width, spec[i].pad_width);
}
#endif
ok &= (flag_dump_strings ? dump_strings () : dump ());
cleanup:
if (have_read_stdin && fclose (stdin) == EOF)
error (EXIT_FAILURE, errno, _("standard input"));
return ok ? EXIT_SUCCESS : EXIT_FAILURE;
}