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od_bloaty.c
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/* 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("cannot 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_GETOPT_LONG
/* 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_GETOPT_LONG
/* 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 },
{ }
};
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. */