summaryrefslogtreecommitdiff
path: root/coreutils/od_bloaty.c
blob: 325085626b0ce40d88f628d21026b16b5ca29607 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
/* 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 Denis 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"
#include <getopt.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[] =
{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[] =
{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[] =
{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[] =
{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[] = {
	-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 dummy {
	int assert_width_bytes_matches_size_spec_decl
		[sizeof width_bytes / sizeof width_bytes[0] == N_SIZE_SPECS ? 1 : -1];
};

static size_t string_min;
static int flag_dump_strings;

/* Non-zero if an old-style 'pseudo-address' was specified.  */
static int flag_pseudo_start;

/* The difference between the old-style pseudo starting address and
   the number of bytes to skip.  */
static off_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) (off_t, char);

/* The number of input bytes to skip before formatting and writing.  */
static off_t n_bytes_to_skip; // = 0;

/* When zero, MAX_BYTES_TO_FORMAT and END_OFFSET are ignored, and all
   input is formatted.  */
static int limit_bytes_to_format; // = 0;

/* The maximum number of bytes that will be formatted.  */
static off_t max_bytes_to_format;

/* The offset of the first byte after the last byte to be formatted.  */
static off_t end_offset;

/* When nonzero 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 int abbreviate_duplicate_blocks = 1;

/* An array of specs describing how to format each input block.  */
static size_t n_specs;
static struct tspec *spec;

/* 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 only when *file_list 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;

static int ioerror;

#define MAX_INTEGRAL_TYPE_SIZE sizeof(ulonglong_t)
static unsigned char integral_type_size[MAX_INTEGRAL_TYPE_SIZE + 1] = {
	[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 unsigned char fp_type_size[MAX_FP_TYPE_SIZE + 1] = {
	/* 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 thru 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 ATTRIBUTE_UNUSED)
{
	/* Names for some non-printing characters.  */
	static const char charname[33][3] = {
		"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 ATTRIBUTE_UNUSED)
{
	// 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) {
		input_filename = *file_list;
		if (!input_filename)
			return;
		file_list++;
		in_stream = fopen_or_warn_stdin(input_filename);
		if (in_stream) {
			if (in_stream == stdin)
				input_filename = bb_msg_standard_input;
			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", input_filename);
			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, make *NEXT point at the
   character following the just-decoded format (if *NEXT is non-NULL),
   and return zero.  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)
		fmt_string = "%011d%c";
	}
   S_ORIG is solely for reporting errors.  It should be the full format
   string argument. */

static void
decode_one_format(const char *s_orig, const char *s, const char **next,
					   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;

	assert(tspec != NULL);

	switch (*s) {
	case 'd':
	case 'o':
	case 'u':
	case 'x': {
		static const char CSIL[] = "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[] = {
				sizeof(char),
				sizeof(short),
				sizeof(int),
				sizeof(long),
			};
			size = CSIL_sizeof[p - CSIL];
		}

#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[] = "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[] = "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++;

	if (next != NULL)
		*next = s;
}

/* Decode the modern od format string S.  Append the decoded
   representation to the global array SPEC, reallocating SPEC if
   necessary.  Return zero if S is valid, nonzero otherwise.  */

static void
decode_format_string(const char *s)
{
	const char *s_orig = s;

	while (*s != '\0') {
		struct tspec tspec;
		const char *next;

		decode_one_format(s_orig, s, &next, &tspec);

		assert(s != next);
		s = next;
		n_specs++;
		spec = xrealloc(spec, n_specs * sizeof(*spec));
		memcpy(&spec[n_specs-1], &tspec, sizeof *spec);
	}
}

/* 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 nonnegative size,
			   position the file pointer by reading.  */
			char buf[BUFSIZ];
			size_t n_bytes_read, n_bytes_to_read = BUFSIZ;

			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 ATTRIBUTE_UNUSED, char c ATTRIBUTE_UNUSED)
{
}

static char address_fmt[] = "%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 (abbreviate_duplicate_blocks
	 && !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 },
		{ NULL, 0 }
	};
	char *p;
	int radix;

	/* Skip over any leading '+'. */
	if (s[0] == '+') ++s;

	/* Determine the radix we'll use to interpret S.  If there is a '.',
	 * it's decimal, otherwise, if the string begins with '0X'or '0x',
	 * it's hexadecimal, else octal.  */
	p = strchr(s, '.');
	radix = 8;
	if (p) {
		p[0] = '\0'; /* cheating */
		radix = 10;
	} else if (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'))
		radix = 16;

	*offset = xstrtooff_sfx(s, radix, Bb);
	if (p) p[0] = '.';

	return (*offset >= 0);
}
#endif

/* Read a chunk of size BYTES_PER_BLOCK from the input files, write the
   formatted block to standard output, and repeat until the specified
   maximum number of bytes has been read or until all input has been
   processed.  If the last block read is smaller than BYTES_PER_BLOCK
   and its size is not a multiple of the size associated with a format
   spec, extend the input block with zero bytes until its length is a
   multiple of all format spec sizes.  Write the final block.  Finally,
   write on a line by itself the offset of the byte after the last byte
   read.  Accumulate return values from calls to read_block and
   check_and_close, and if any was nonzero, return nonzero.
   Otherwise, return zero.  */

static void
dump(void)
{
	char *block[2];
	off_t current_offset;
	int idx;
	size_t n_bytes_read;

	block[0] = xmalloc(2*bytes_per_block);
	block[1] = block[0] + bytes_per_block;

	current_offset = n_bytes_to_skip;

	idx = 0;
	if (limit_bytes_to_format) {
		while (1) {
			size_t n_needed;
			if (current_offset >= end_offset) {
				n_bytes_read = 0;
				break;
			}
			n_needed = MIN(end_offset - current_offset,
				(off_t) bytes_per_block);
			read_block(n_needed, block[idx], &n_bytes_read);
			if (n_bytes_read < bytes_per_block)
				break;
			assert(n_bytes_read == bytes_per_block);
			write_block(current_offset, n_bytes_read,
			       block[!idx], block[idx]);
			current_offset += n_bytes_read;
			idx = !idx;
		}
	} else {
		while (1) {
			read_block(bytes_per_block, block[idx], &n_bytes_read);
			if (n_bytes_read < bytes_per_block)
				break;
			assert(n_bytes_read == bytes_per_block);
			write_block(current_offset, n_bytes_read,
			       block[!idx], block[idx]);
			current_offset += n_bytes_read;
			idx = !idx;
		}
	}

	if (n_bytes_read > 0) {
		int l_c_m;
		size_t bytes_to_write;

		l_c_m = get_lcm();

		/* Make bytes_to_write the smallest multiple of l_c_m that
			 is at least as large as n_bytes_read.  */
		bytes_to_write = l_c_m * ((n_bytes_read + l_c_m - 1) / l_c_m);

		memset(block[idx] + n_bytes_read, 0, bytes_to_write - n_bytes_read);
		write_block(current_offset, bytes_to_write,
				   block[!idx], block[idx]);
		current_offset += n_bytes_read;
	}

	format_address(current_offset, '\n');

	if (limit_bytes_to_format && current_offset >= end_offset)
		check_and_close();

	free(block[0]);
}

/* Read a single byte into *C from the concatenation of the input files
   named in the global array FILE_LIST.  On the first call to this
   function, the global variable IN_STREAM is expected to be an open
   stream associated with the input file INPUT_FILENAME.  If IN_STREAM
   is at end-of-file, close it and update the global variables IN_STREAM
   and INPUT_FILENAME so they correspond to the next file in the list.
   Then try to read a byte from the newly opened file.  Repeat if
   necessary until EOF is reached for the last file in FILE_LIST, then
   set *C to EOF and return.  Subsequent calls do likewise.  The return
   value is nonzero if any errors occured, zero otherwise.  */

static void
read_char(int *c)
{
	while (in_stream) { /* !EOF */
		*c = fgetc(in_stream);
		if (*c != EOF)
			return;
		check_and_close();
		open_next_file();
	}
	*c = EOF;
}

/* Read N bytes into BLOCK from the concatenation of the input files
   named in the global array FILE_LIST.  On the first call to this
   function, the global variable IN_STREAM is expected to be an open
   stream associated with the input file INPUT_FILENAME.  If all N
   bytes cannot be read from IN_STREAM, close IN_STREAM and update
   the global variables IN_STREAM and INPUT_FILENAME.  Then try to
   read the remaining bytes from the newly opened file.  Repeat if
   necessary until EOF is reached for the last file in FILE_LIST.
   On subsequent calls, don't modify BLOCK and return zero.  Set
   *N_BYTES_IN_BUFFER to the number of bytes read.  If an error occurs,
   it will be detected through ferror when the stream is about to be
   closed.  If there is an error, give a message but continue reading
   as usual and return nonzero.  Otherwise return zero.  */

/* STRINGS mode.  Find each "string constant" in the input.
   A string constant is a run of at least 'string_min' ASCII
   graphic (or formatting) characters terminated by a null.
   Based on a function written by Richard Stallman for a
   traditional version of od.  Return nonzero if an error
   occurs.  Otherwise, return zero.  */

static void
dump_strings(void)
{
	size_t bufsize = MAX(100, string_min);
	char *buf = xmalloc(bufsize);
	off_t address = n_bytes_to_skip;

	while (1) {
		size_t i;
		int c;

		/* See if the next 'string_min' chars are all printing chars.  */
 tryline:
		if (limit_bytes_to_format && (end_offset - string_min <= address))
			break;
		i = 0;
		while (!limit_bytes_to_format || address < end_offset) {
			if (i == bufsize) {
				bufsize += bufsize/8;
				buf = xrealloc(buf, bufsize);
			}
			read_char(&c);
			if (c < 0) { /* EOF */
				free(buf);
				return;
			}
			address++;
			if (!c)
				break;
			if (!ISPRINT(c))
				goto tryline;	/* It isn't; give up on this string.  */
			buf[i++] = c;		/* String continues; store it all.  */
		}

		if (i < string_min)		/* Too short! */
			goto tryline;

		/* If we get here, the string is all printable and 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 '\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: 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);

	check_and_close();
}

int od_main(int argc, char **argv);
int od_main(int argc, char **argv)
{
	static const struct suffix_mult bkm[] = {
		{ "b", 512 },
		{ "k", 1024 },
		{ "m", 1024*1024 },
		{ NULL, 0 }
	};
	unsigned opt;
	int l_c_m;
	/* The old-style 'pseudo starting address' to be printed in parentheses
	   after any true address.  */
	off_t pseudo_start = 0; // only for gcc
	enum {
		OPT_A = 1 << 0,
		OPT_N = 1 << 1,
		OPT_a = 1 << 2,
		OPT_b = 1 << 3,
		OPT_c = 1 << 4,
		OPT_d = 1 << 5,
		OPT_f = 1 << 6,
		OPT_h = 1 << 7,
		OPT_i = 1 << 8,
		OPT_j = 1 << 9,
		OPT_l = 1 << 10,
		OPT_o = 1 << 11,
		OPT_t = 1 << 12,
		OPT_v = 1 << 13,
		OPT_x = 1 << 14,
		OPT_s = 1 << 15,
		OPT_S = 1 << 16,
		OPT_w = 1 << 17,
		OPT_traditional = (1 << 18) * ENABLE_GETOPT_LONG,
	};
#if ENABLE_GETOPT_LONG
	static const struct option 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' },
		{ "width",         optional_argument, NULL, 'w' },
		{ "traditional",   no_argument,       NULL, 0xff },
		{ NULL, 0, NULL, 0 }
	};
#endif
	char *str_A, *str_N, *str_j, *str_S;
	char *str_w = NULL;
	llist_t *lst_t = NULL;

	spec = NULL;
	format_address = format_address_std;
	address_base_char = 'o';
	address_pad_len_char = '7';
	flag_dump_strings = 0;

	/* Parse command line */
	opt_complementary = "t::"; // list
#if ENABLE_GETOPT_LONG
	applet_long_options = long_options;
#endif
	opt = getopt32(argc, 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, &str_w);
	argc -= optind;
	argv += optind;
	if (opt & OPT_A) {
		static const char doxn[] = "doxn";
		static const char doxn_address_base_char[] = {
			'u', 'o', 'x', /* '?' fourth one is not important */
		};
		static const uint8_t doxn_address_pad_len_char[] = {
			'7', '7', '6', /* '?' */
		};
		char *p;
		int pos;
		p = strchr(doxn, str_A[0]);
		if (!p)
			bb_error_msg_and_die("bad output address radix "
				"'%c' (must be [doxn])", str_A[0]);
		pos = p - doxn;
		if (pos == 3) format_address = format_address_none;
		address_base_char = doxn_address_base_char[pos];
		address_pad_len_char = doxn_address_pad_len_char[pos];
	}
	if (opt & OPT_N) {
		limit_bytes_to_format = 1;
		max_bytes_to_format = xstrtooff_sfx(str_N, 0, bkm);
	}
	if (opt & OPT_a) decode_format_string("a");
	if (opt & OPT_b) decode_format_string("oC");
	if (opt & OPT_c) decode_format_string("c");
	if (opt & OPT_d) decode_format_string("u2");
	if (opt & OPT_f) decode_format_string("fF");
	if (opt & OPT_h) decode_format_string("x2");
	if (opt & OPT_i) decode_format_string("d2");
	if (opt & OPT_j) n_bytes_to_skip = xstrtooff_sfx(str_j, 0, bkm);
	if (opt & OPT_l) decode_format_string("d4");
	if (opt & OPT_o) decode_format_string("o2");
	//if (opt & OPT_t)...
	while (lst_t) {
		decode_format_string(lst_t->data);
		lst_t = lst_t->link;
	}
	if (opt & OPT_v) abbreviate_duplicate_blocks = 0;
	if (opt & OPT_x) decode_format_string("x2");
	if (opt & OPT_s) decode_format_string("d2");
	if (opt & OPT_S) {
		string_min = 3;
		string_min = xstrtou_sfx(str_S, 0, bkm);
		flag_dump_strings = 1;
	}
	//if (opt & OPT_w)...
	//if (opt & OPT_traditional)...

	if (flag_dump_strings && n_specs > 0)
		bb_error_msg_and_die("no type may be specified when dumping strings");

	/* If the --traditional option is used, there may be from
	 * 0 to 3 remaining command line arguments;  handle each case
	 * separately.
	 * od [file] [[+]offset[.][b] [[+]label[.][b]]]
	 * The offset and pseudo_start have the same syntax.
	 *
	 * FIXME: POSIX 1003.1-2001 with XSI requires support for the
	 * traditional syntax even if --traditional is not given.  */

#if ENABLE_GETOPT_LONG
	if (opt & OPT_traditional) {
		off_t o1, o2;

		if (argc == 1) {
			if (parse_old_offset(argv[0], &o1)) {
				n_bytes_to_skip = o1;
				--argc;
				++argv;
			}
		} else if (argc == 2) {
			if (parse_old_offset(argv[0], &o1)
			 && parse_old_offset(argv[1], &o2)
			) {
				n_bytes_to_skip = o1;
				flag_pseudo_start = 1;
				pseudo_start = o2;
				argv += 2;
				argc -= 2;
			} else if (parse_old_offset(argv[1], &o2)) {
				n_bytes_to_skip = o2;
				--argc;
				argv[1] = argv[0];
				++argv;
			} else {
				bb_error_msg_and_die("invalid second operand "
					"in compatibility mode '%s'", argv[1]);
			}
		} else if (argc == 3) {
			if (parse_old_offset(argv[1], &o1)
			 && parse_old_offset(argv[2], &o2)
			) {
				n_bytes_to_skip = o1;
				flag_pseudo_start = 1;
				pseudo_start = o2;
				argv[2] = argv[0];
				argv += 2;
				argc -= 2;
			} else {
				bb_error_msg_and_die("in compatibility mode "
					"the last two arguments must be offsets");
			}
		} else if (argc > 3)	{
			bb_error_msg_and_die("compatibility mode supports "
				"at most three arguments");
		}

		if (flag_pseudo_start) {
			if (format_address == format_address_none) {
				address_base_char = 'o';
				address_pad_len_char = '7';
				format_address = format_address_paren;
			} else
				format_address = format_address_label;
		}
	}
#endif

	if (limit_bytes_to_format) {
		end_offset = n_bytes_to_skip + max_bytes_to_format;
		if (end_offset < n_bytes_to_skip)
			bb_error_msg_and_die("skip-bytes + read-bytes is too large");
	}

	if (n_specs == 0) {
		decode_format_string("o2");
		n_specs = 1;
	}

	/* If no files were listed on the command line,
	   set the global pointer FILE_LIST so that it
	   references the null-terminated list of one name: "-".  */
	file_list = default_file_list;
	if (argc > 0) {
		/* Set the global pointer FILE_LIST so that it
		   references the first file-argument on the command-line.  */
		file_list = (char const *const *) argv;
	}

	/* open the first input file */
	open_next_file();
	/* skip over any unwanted header bytes */
	skip(n_bytes_to_skip);
	if (!in_stream)
		return 1;

	pseudo_offset = (flag_pseudo_start ? pseudo_start - n_bytes_to_skip : 0);

	/* Compute output block length.  */
	l_c_m = get_lcm();

	if (opt & OPT_w) { /* -w: width */
		bytes_per_block = 32;
		if (str_w)
			bytes_per_block = xatou(str_w);
		if (!bytes_per_block || bytes_per_block % l_c_m != 0) {
			bb_error_msg("warning: invalid width %zu; using %d instead",
					bytes_per_block, l_c_m);
			bytes_per_block = l_c_m;
		}
	} else {
		bytes_per_block = l_c_m;
		if (l_c_m < DEFAULT_BYTES_PER_BLOCK)
			bytes_per_block *= DEFAULT_BYTES_PER_BLOCK / l_c_m;
	}

#ifdef DEBUG
	for (i = 0; i < n_specs; i++) {
		printf("%d: fmt=\"%s\" width=%d\n",
			i, spec[i].fmt_string, width_bytes[spec[i].size]);
	}
#endif

	if (flag_dump_strings)
		dump_strings();
	else
		dump();

	if (fclose(stdin) == EOF)
		bb_perror_msg_and_die(bb_msg_standard_input);

	return (ioerror != 0); /* err != 0 - return 1 (failure) */
}