aboutsummaryrefslogtreecommitdiff
path: root/src/xz/args.c
blob: b50e28b7fd9061d55fce27b7e688df9440eb6fa7 (plain) (blame)
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
///////////////////////////////////////////////////////////////////////////////
//
/// \file       args.c
/// \brief      Argument parsing
///
/// \note       Filter-specific options parsing is in options.c.
//
//  Author:     Lasse Collin
//
//  This file has been put into the public domain.
//  You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////

#include "private.h"

#include "getopt.h"
#include <ctype.h>


bool opt_stdout = false;
bool opt_force = false;
bool opt_keep_original = false;

// We don't modify or free() this, but we need to assign it in some
// non-const pointers.
const char *stdin_filename = "(stdin)";


static void
parse_real(args_info *args, int argc, char **argv)
{
	enum {
		OPT_SUBBLOCK = INT_MIN,
		OPT_X86,
		OPT_POWERPC,
		OPT_IA64,
		OPT_ARM,
		OPT_ARMTHUMB,
		OPT_SPARC,
		OPT_DELTA,
		OPT_LZMA1,
		OPT_LZMA2,

		OPT_FILES,
		OPT_FILES0,
	};

	static const char short_opts[]
			= "cC:defF:hHlkM:qQrS:tT:vVz0123456789";

	static const struct option long_opts[] = {
		// Operation mode
		{ "compress",       no_argument,       NULL,  'z' },
		{ "decompress",     no_argument,       NULL,  'd' },
		{ "uncompress",     no_argument,       NULL,  'd' },
		{ "test",           no_argument,       NULL,  't' },
		{ "list",           no_argument,       NULL,  'l' },

		// Operation modifiers
		{ "keep",           no_argument,       NULL,  'k' },
		{ "force",          no_argument,       NULL,  'f' },
		{ "stdout",         no_argument,       NULL,  'c' },
		{ "to-stdout",      no_argument,       NULL,  'c' },
		{ "suffix",         required_argument, NULL,  'S' },
		// { "recursive",      no_argument,       NULL,  'r' }, // TODO
		{ "files",          optional_argument, NULL,  OPT_FILES },
		{ "files0",         optional_argument, NULL,  OPT_FILES0 },

		// Basic compression settings
		{ "format",         required_argument, NULL,  'F' },
		{ "check",          required_argument, NULL,  'C' },
		{ "memory",         required_argument, NULL,  'M' },
		{ "threads",        required_argument, NULL,  'T' },

		{ "extreme",        no_argument,       NULL,  'e' },
		{ "fast",           no_argument,       NULL,  '0' },
		{ "best",           no_argument,       NULL,  '9' },

		// Filters
		{ "lzma1",          optional_argument, NULL,  OPT_LZMA1 },
		{ "lzma2",          optional_argument, NULL,  OPT_LZMA2 },
		{ "x86",            optional_argument, NULL,  OPT_X86 },
		{ "powerpc",        optional_argument, NULL,  OPT_POWERPC },
		{ "ia64",           optional_argument, NULL,  OPT_IA64 },
		{ "arm",            optional_argument, NULL,  OPT_ARM },
		{ "armthumb",       optional_argument, NULL,  OPT_ARMTHUMB },
		{ "sparc",          optional_argument, NULL,  OPT_SPARC },
		{ "delta",          optional_argument, NULL,  OPT_DELTA },
		{ "subblock",       optional_argument, NULL,  OPT_SUBBLOCK },

		// Other options
		{ "quiet",          no_argument,       NULL,  'q' },
		{ "verbose",        no_argument,       NULL,  'v' },
		{ "no-warn",        no_argument,       NULL,  'Q' },
		{ "help",           no_argument,       NULL,  'h' },
		{ "long-help",      no_argument,       NULL,  'H' },
		{ "version",        no_argument,       NULL,  'V' },

		{ NULL,                 0,                 NULL,   0 }
	};

	int c;

	while ((c = getopt_long(argc, argv, short_opts, long_opts, NULL))
			!= -1) {
		switch (c) {
		// Compression preset (also for decompression if --format=raw)
		case '0': case '1': case '2': case '3': case '4':
		case '5': case '6': case '7': case '8': case '9':
			coder_set_preset(c - '0');
			break;

		// --memory
		case 'M': {
			// Support specifying the limit as a percentage of
			// installed physical RAM.
			size_t len = strlen(optarg);
			if (len > 0 && optarg[len - 1] == '%') {
				optarg[len - 1] = '\0';
				hardware_memlimit_set_percentage(
						str_to_uint64(
						"memory%", optarg, 1, 100));
			} else {
				// On 32-bit systems, SIZE_MAX would make more
				// sense than UINT64_MAX. But use UINT64_MAX
				// still so that scripts that assume > 4 GiB
				// values don't break.
				hardware_memlimit_set(str_to_uint64(
						"memory", optarg,
						0, UINT64_MAX));
			}

			break;
		}

		// --suffix
		case 'S':
			suffix_set(optarg);
			break;

		case 'T':
			hardware_threadlimit_set(str_to_uint64(
					"threads", optarg, 0, UINT32_MAX));
			break;

		// --version
		case 'V':
			// This doesn't return.
			message_version();

		// --stdout
		case 'c':
			opt_stdout = true;
			break;

		// --decompress
		case 'd':
			opt_mode = MODE_DECOMPRESS;
			break;

		// --extreme
		case 'e':
			coder_set_extreme();
			break;

		// --force
		case 'f':
			opt_force = true;
			break;

		// --help
		case 'h':
			// This doesn't return.
			message_help(false);

		// --long-help
		case 'H':
			// This doesn't return.
			message_help(true);

		// --list
		case 'l':
			opt_mode = MODE_LIST;
			break;

		// --keep
		case 'k':
			opt_keep_original = true;
			break;

		// --quiet
		case 'q':
			message_verbosity_decrease();
			break;

		case 'Q':
			set_exit_no_warn();
			break;

		case 't':
			opt_mode = MODE_TEST;
			break;

		// --verbose
		case 'v':
			message_verbosity_increase();
			break;

		case 'z':
			opt_mode = MODE_COMPRESS;
			break;

		// Filter setup

		case OPT_SUBBLOCK:
			coder_add_filter(LZMA_FILTER_SUBBLOCK,
					options_subblock(optarg));
			break;

		case OPT_X86:
			coder_add_filter(LZMA_FILTER_X86,
					options_bcj(optarg));
			break;

		case OPT_POWERPC:
			coder_add_filter(LZMA_FILTER_POWERPC,
					options_bcj(optarg));
			break;

		case OPT_IA64:
			coder_add_filter(LZMA_FILTER_IA64,
					options_bcj(optarg));
			break;

		case OPT_ARM:
			coder_add_filter(LZMA_FILTER_ARM,
					options_bcj(optarg));
			break;

		case OPT_ARMTHUMB:
			coder_add_filter(LZMA_FILTER_ARMTHUMB,
					options_bcj(optarg));
			break;

		case OPT_SPARC:
			coder_add_filter(LZMA_FILTER_SPARC,
					options_bcj(optarg));
			break;

		case OPT_DELTA:
			coder_add_filter(LZMA_FILTER_DELTA,
					options_delta(optarg));
			break;

		case OPT_LZMA1:
			coder_add_filter(LZMA_FILTER_LZMA1,
					options_lzma(optarg));
			break;

		case OPT_LZMA2:
			coder_add_filter(LZMA_FILTER_LZMA2,
					options_lzma(optarg));
			break;

		// Other

		// --format
		case 'F': {
			// Just in case, support both "lzma" and "alone" since
			// the latter was used for forward compatibility in
			// LZMA Utils 4.32.x.
			static const struct {
				char str[8];
				enum format_type format;
			} types[] = {
				{ "auto",   FORMAT_AUTO },
				{ "xz",     FORMAT_XZ },
				{ "lzma",   FORMAT_LZMA },
				{ "alone",  FORMAT_LZMA },
				// { "gzip",   FORMAT_GZIP },
				// { "gz",     FORMAT_GZIP },
				{ "raw",    FORMAT_RAW },
			};

			size_t i = 0;
			while (strcmp(types[i].str, optarg) != 0)
				if (++i == ARRAY_SIZE(types))
					message_fatal(_("%s: Unknown file "
							"format type"),
							optarg);

			opt_format = types[i].format;
			break;
		}

		// --check
		case 'C': {
			static const struct {
				char str[8];
				lzma_check check;
			} types[] = {
				{ "none",   LZMA_CHECK_NONE },
				{ "crc32",  LZMA_CHECK_CRC32 },
				{ "crc64",  LZMA_CHECK_CRC64 },
				{ "sha256", LZMA_CHECK_SHA256 },
			};

			size_t i = 0;
			while (strcmp(types[i].str, optarg) != 0) {
				if (++i == ARRAY_SIZE(types))
					message_fatal(_("%s: Unsupported "
							"integrity "
							"check type"), optarg);
			}

			// Use a separate check in case we are using different
			// liblzma than what was used to compile us.
			if (!lzma_check_is_supported(types[i].check))
				message_fatal(_("%s: Unsupported integrity "
						"check type"), optarg);

			coder_set_check(types[i].check);
			break;
		}

		case OPT_FILES:
			args->files_delim = '\n';

		// Fall through

		case OPT_FILES0:
			if (args->files_name != NULL)
				message_fatal(_("Only one file can be "
						"specified with `--files'"
						"or `--files0'."));

			if (optarg == NULL) {
				args->files_name = (char *)stdin_filename;
				args->files_file = stdin;
			} else {
				args->files_name = optarg;
				args->files_file = fopen(optarg,
						c == OPT_FILES ? "r" : "rb");
				if (args->files_file == NULL)
					message_fatal("%s: %s", optarg,
							strerror(errno));
			}

			break;

		default:
			message_try_help();
			my_exit(E_ERROR);
		}
	}

	return;
}


static void
parse_environment(args_info *args, char *argv0)
{
	char *env = getenv("XZ_OPT");
	if (env == NULL)
		return;

	// We modify the string, so make a copy of it.
	env = xstrdup(env);

	// Calculate the number of arguments in env. argc stats at one
	// to include space for the program name.
	int argc = 1;
	bool prev_was_space = true;
	for (size_t i = 0; env[i] != '\0'; ++i) {
		// NOTE: Cast to unsigned char is needed so that correct
		// value gets passed to isspace(), which expects
		// unsigned char cast to int. Casting to int is done
		// automatically due to integer promotion, but we need to
		// force char to unsigned char manually. Otherwise 8-bit
		// characters would get promoted to wrong value if
		// char is signed.
		if (isspace((unsigned char)env[i])) {
			prev_was_space = true;
		} else if (prev_was_space) {
			prev_was_space = false;

			// Keep argc small enough to fit into a singed int
			// and to keep it usable for memory allocation.
			if (++argc == MIN(INT_MAX, SIZE_MAX / sizeof(char *)))
				message_fatal(_("The environment variable "
						"XZ_OPT contains too many "
						"arguments"));
		}
	}

	// Allocate memory to hold pointers to the arguments. Add one to get
	// space for the terminating NULL (if some systems happen to need it).
	char **argv = xmalloc(((size_t)(argc) + 1) * sizeof(char *));
	argv[0] = argv0;
	argv[argc] = NULL;

	// Go through the string again. Split the arguments using '\0'
	// characters and add pointers to the resulting strings to argv.
	argc = 1;
	prev_was_space = true;
	for (size_t i = 0; env[i] != '\0'; ++i) {
		if (isspace((unsigned char)env[i])) {
			prev_was_space = true;
			env[i] = '\0';
		} else if (prev_was_space) {
			prev_was_space = false;
			argv[argc++] = env + i;
		}
	}

	// Parse the argument list we got from the environment. All non-option
	// arguments i.e. filenames are ignored.
	parse_real(args, argc, argv);

	// Reset the state of the getopt_long() so that we can parse the
	// command line options too. There are two incompatible ways to
	// do it.
#ifdef HAVE_OPTRESET
	// BSD
	optind = 1;
	optreset = 1;
#else
	// GNU, Solaris
	optind = 0;
#endif

	// We don't need the argument list from environment anymore.
	free(argv);
	free(env);

	return;
}


extern void
args_parse(args_info *args, int argc, char **argv)
{
	// Initialize those parts of *args that we need later.
	args->files_name = NULL;
	args->files_file = NULL;
	args->files_delim = '\0';

	// Check how we were called.
	{
#ifdef DOSLIKE
		// We adjusted argv[0] in the beginning of main() so we don't
		// need to do anything here.
		const char *name = argv[0];
#else
		// Remove the leading path name, if any.
		const char *name = strrchr(argv[0], '/');
		if (name == NULL)
			name = argv[0];
		else
			++name;
#endif

		// NOTE: It's possible that name[0] is now '\0' if argv[0]
		// is weird, but it doesn't matter here.

		// Look for full command names instead of substrings like
		// "un", "cat", and "lz" to reduce possibility of false
		// positives when the programs have been renamed.
		if (strstr(name, "xzcat") != NULL) {
			opt_mode = MODE_DECOMPRESS;
			opt_stdout = true;
		} else if (strstr(name, "unxz") != NULL) {
			opt_mode = MODE_DECOMPRESS;
		} else if (strstr(name, "lzcat") != NULL) {
			opt_format = FORMAT_LZMA;
			opt_mode = MODE_DECOMPRESS;
			opt_stdout = true;
		} else if (strstr(name, "unlzma") != NULL) {
			opt_format = FORMAT_LZMA;
			opt_mode = MODE_DECOMPRESS;
		} else if (strstr(name, "lzma") != NULL) {
			opt_format = FORMAT_LZMA;
		}
	}

	// First the flags from environment
	parse_environment(args, argv[0]);

	// Then from the command line
	parse_real(args, argc, argv);

	// Never remove the source file when the destination is not on disk.
	// In test mode the data is written nowhere, but setting opt_stdout
	// will make the rest of the code behave well.
	if (opt_stdout || opt_mode == MODE_TEST) {
		opt_keep_original = true;
		opt_stdout = true;
	}

	// When compressing, if no --format flag was used, or it
	// was --format=auto, we compress to the .xz format.
	if (opt_mode == MODE_COMPRESS && opt_format == FORMAT_AUTO)
		opt_format = FORMAT_XZ;

	// Compression settings need to be validated (options themselves and
	// their memory usage) when compressing to any file format. It has to
	// be done also when uncompressing raw data, since for raw decoding
	// the options given on the command line are used to know what kind
	// of raw data we are supposed to decode.
	if (opt_mode == MODE_COMPRESS || opt_format == FORMAT_RAW)
		coder_set_compression_settings();

	// If no filenames are given, use stdin.
	if (argv[optind] == NULL && args->files_name == NULL) {
		// We don't modify or free() the "-" constant. The caller
		// modifies this so don't make the struct itself const.
		static char *names_stdin[2] = { (char *)"-", NULL };
		args->arg_names = names_stdin;
		args->arg_count = 1;
	} else {
		// We got at least one filename from the command line, or
		// --files or --files0 was specified.
		args->arg_names = argv + optind;
		args->arg_count = argc - optind;
	}

	return;
}