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xz-archive/src/xz/args.c

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///////////////////////////////////////////////////////////////////////////////
//
/// \file args.c
/// \brief Argument parsing
///
/// \note Filter-specific options parsing is in options.c.
//
// Author: Lasse Collin
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//
// This file has been put into the public domain.
// You can do whatever you want with this file.
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//
///////////////////////////////////////////////////////////////////////////////
#include "private.h"
#include "getopt.h"
#include <ctype.h>
bool opt_stdout = false;
bool opt_force = false;
bool opt_keep_original = false;
bool opt_robot = false;
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bool opt_ignore_check = false;
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// We don't modify or free() this, but we need to assign it in some
// non-const pointers.
const char stdin_filename[] = "(stdin)";
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/// Parse and set the memory usage limit for compression and/or decompression.
static void
parse_memlimit(const char *name, const char *name_percentage, char *str,
bool set_compress, bool set_decompress)
{
bool is_percentage = false;
uint64_t value;
const size_t len = strlen(str);
if (len > 0 && str[len - 1] == '%') {
str[len - 1] = '\0';
is_percentage = true;
value = str_to_uint64(name_percentage, str, 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.
value = str_to_uint64(name, str, 0, UINT64_MAX);
}
hardware_memlimit_set(
value, set_compress, set_decompress, is_percentage);
return;
}
static void
parse_block_list(char *str)
{
// It must be non-empty and not begin with a comma.
if (str[0] == '\0' || str[0] == ',')
message_fatal(_("%s: Invalid argument to --block-list"), str);
// Count the number of comma-separated strings.
size_t count = 1;
for (size_t i = 0; str[i] != '\0'; ++i)
if (str[i] == ',')
++count;
// Prevent an unlikely integer overflow.
if (count > SIZE_MAX / sizeof(uint64_t) - 1)
message_fatal(_("%s: Too many arguments to --block-list"),
str);
// Allocate memory to hold all the sizes specified.
// If --block-list was specified already, its value is forgotten.
free(opt_block_list);
opt_block_list = xmalloc((count + 1) * sizeof(uint64_t));
for (size_t i = 0; i < count; ++i) {
// Locate the next comma and replace it with \0.
char *p = strchr(str, ',');
if (p != NULL)
*p = '\0';
if (str[0] == '\0') {
// There is no string, that is, a comma follows
// another comma. Use the previous value.
//
// NOTE: We checked earler that the first char
// of the whole list cannot be a comma.
assert(i > 0);
opt_block_list[i] = opt_block_list[i - 1];
} else {
opt_block_list[i] = str_to_uint64("block-list", str,
0, UINT64_MAX);
// Zero indicates no more new Blocks.
if (opt_block_list[i] == 0) {
if (i + 1 != count)
message_fatal(_("0 can only be used "
"as the last element "
"in --block-list"));
opt_block_list[i] = UINT64_MAX;
}
}
str = p + 1;
}
// Terminate the array.
opt_block_list[count] = 0;
return;
}
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static void
parse_real(args_info *args, int argc, char **argv)
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{
enum {
OPT_X86 = INT_MIN,
OPT_POWERPC,
OPT_IA64,
OPT_ARM,
OPT_ARMTHUMB,
OPT_SPARC,
OPT_DELTA,
OPT_LZMA1,
OPT_LZMA2,
OPT_SINGLE_STREAM,
OPT_NO_SPARSE,
OPT_FILES,
OPT_FILES0,
OPT_BLOCK_SIZE,
OPT_BLOCK_LIST,
OPT_MEM_COMPRESS,
OPT_MEM_DECOMPRESS,
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OPT_NO_ADJUST,
OPT_INFO_MEMORY,
OPT_ROBOT,
OPT_FLUSH_TIMEOUT,
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OPT_IGNORE_CHECK,
};
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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' },
{ "single-stream", no_argument, NULL, OPT_SINGLE_STREAM },
{ "no-sparse", no_argument, NULL, OPT_NO_SPARSE },
{ "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' },
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{ "ignore-check", no_argument, NULL, OPT_IGNORE_CHECK },
{ "block-size", required_argument, NULL, OPT_BLOCK_SIZE },
{ "block-list", required_argument, NULL, OPT_BLOCK_LIST },
{ "memlimit-compress", required_argument, NULL, OPT_MEM_COMPRESS },
{ "memlimit-decompress", required_argument, NULL, OPT_MEM_DECOMPRESS },
{ "memlimit", required_argument, NULL, 'M' },
{ "memory", required_argument, NULL, 'M' }, // Old alias
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{ "no-adjust", no_argument, NULL, OPT_NO_ADJUST },
{ "threads", required_argument, NULL, 'T' },
{ "flush-timeout", required_argument, NULL, OPT_FLUSH_TIMEOUT },
{ "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 },
// Other options
{ "quiet", no_argument, NULL, 'q' },
{ "verbose", no_argument, NULL, 'v' },
{ "no-warn", no_argument, NULL, 'Q' },
{ "robot", no_argument, NULL, OPT_ROBOT },
{ "info-memory", no_argument, NULL, OPT_INFO_MEMORY },
{ "help", no_argument, NULL, 'h' },
{ "long-help", no_argument, NULL, 'H' },
{ "version", no_argument, NULL, 'V' },
{ NULL, 0, NULL, 0 }
};
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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':
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case '5': case '6': case '7': case '8': case '9':
coder_set_preset(c - '0');
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break;
// --memlimit-compress
case OPT_MEM_COMPRESS:
parse_memlimit("memlimit-compress",
"memlimit-compress%", optarg,
true, false);
break;
// --memlimit-decompress
case OPT_MEM_DECOMPRESS:
parse_memlimit("memlimit-decompress",
"memlimit-decompress%", optarg,
false, true);
break;
// --memlimit
case 'M':
parse_memlimit("memlimit", "memlimit%", optarg,
true, true);
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break;
// --suffix
case 'S':
suffix_set(optarg);
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break;
case 'T':
// The max is from src/liblzma/common/common.h.
hardware_threads_set(str_to_uint64("threads",
optarg, 0, 16384));
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break;
// --version
case 'V':
// This doesn't return.
message_version();
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// --stdout
case 'c':
opt_stdout = true;
break;
// --decompress
case 'd':
opt_mode = MODE_DECOMPRESS;
break;
// --extreme
case 'e':
coder_set_extreme();
break;
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// --force
case 'f':
opt_force = true;
break;
// --info-memory
case OPT_INFO_MEMORY:
// This doesn't return.
hardware_memlimit_show();
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// --help
case 'h':
// This doesn't return.
message_help(false);
// --long-help
case 'H':
// This doesn't return.
message_help(true);
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// --list
case 'l':
opt_mode = MODE_LIST;
break;
// --keep
case 'k':
opt_keep_original = true;
break;
// --quiet
case 'q':
message_verbosity_decrease();
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break;
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case 'Q':
set_exit_no_warn();
break;
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case 't':
opt_mode = MODE_TEST;
break;
// --verbose
case 'v':
message_verbosity_increase();
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break;
// --robot
case OPT_ROBOT:
opt_robot = true;
// This is to make sure that floating point numbers
// always have a dot as decimal separator.
setlocale(LC_NUMERIC, "C");
break;
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case 'z':
opt_mode = MODE_COMPRESS;
break;
// Filter setup
case OPT_X86:
coder_add_filter(LZMA_FILTER_X86,
options_bcj(optarg));
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break;
case OPT_POWERPC:
coder_add_filter(LZMA_FILTER_POWERPC,
options_bcj(optarg));
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break;
case OPT_IA64:
coder_add_filter(LZMA_FILTER_IA64,
options_bcj(optarg));
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break;
case OPT_ARM:
coder_add_filter(LZMA_FILTER_ARM,
options_bcj(optarg));
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break;
case OPT_ARMTHUMB:
coder_add_filter(LZMA_FILTER_ARMTHUMB,
options_bcj(optarg));
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break;
case OPT_SPARC:
coder_add_filter(LZMA_FILTER_SPARC,
options_bcj(optarg));
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break;
case OPT_DELTA:
coder_add_filter(LZMA_FILTER_DELTA,
options_delta(optarg));
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break;
case OPT_LZMA1:
coder_add_filter(LZMA_FILTER_LZMA1,
options_lzma(optarg));
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break;
case OPT_LZMA2:
coder_add_filter(LZMA_FILTER_LZMA2,
options_lzma(optarg));
break;
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// 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 },
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};
size_t i = 0;
while (strcmp(types[i].str, optarg) != 0)
if (++i == ARRAY_SIZE(types))
message_fatal(_("%s: Unknown file "
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"format type"),
optarg);
opt_format = types[i].format;
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break;
}
// --check
case 'C': {
static const struct {
char str[8];
lzma_check check;
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} 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);
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}
// 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);
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break;
}
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case OPT_IGNORE_CHECK:
opt_ignore_check = true;
break;
case OPT_BLOCK_SIZE:
opt_block_size = str_to_uint64("block-size", optarg,
0, LZMA_VLI_MAX);
break;
case OPT_BLOCK_LIST: {
parse_block_list(optarg);
break;
}
case OPT_SINGLE_STREAM:
opt_single_stream = true;
break;
case OPT_NO_SPARSE:
io_no_sparse();
break;
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case OPT_FILES:
args->files_delim = '\n';
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// Fall through
case OPT_FILES0:
if (args->files_name != NULL)
message_fatal(_("Only one file can be "
"specified with `--files' "
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"or `--files0'."));
if (optarg == NULL) {
args->files_name = (char *)stdin_filename;
args->files_file = stdin;
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} else {
args->files_name = optarg;
args->files_file = fopen(optarg,
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c == OPT_FILES ? "r" : "rb");
if (args->files_file == NULL)
message_fatal("%s: %s", optarg,
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strerror(errno));
}
break;
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case OPT_NO_ADJUST:
opt_auto_adjust = false;
break;
case OPT_FLUSH_TIMEOUT:
opt_flush_timeout = str_to_uint64("flush-timeout",
optarg, 0, UINT64_MAX);
break;
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default:
message_try_help();
tuklib_exit(E_ERROR, E_ERROR, false);
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}
}
return;
}
static void
parse_environment(args_info *args, char *argv0, const char *varname)
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{
char *env = getenv(varname);
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if (env == NULL)
return;
// We modify the string, so make a copy of it.
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env = xstrdup(env);
// Calculate the number of arguments in env. argc stats at one
// to include space for the program name.
int argc = 1;
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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])) {
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prev_was_space = true;
} else if (prev_was_space) {
prev_was_space = false;
// Keep argc small enough to fit into a signed int
// and to keep it usable for memory allocation.
if (++argc == my_min(
INT_MAX, SIZE_MAX / sizeof(char *)))
message_fatal(_("The environment variable "
"%s contains too many "
"arguments"), varname);
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}
}
// 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 *));
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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.
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argc = 1;
prev_was_space = true;
for (size_t i = 0; env[i] != '\0'; ++i) {
if (isspace((unsigned char)env[i])) {
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prev_was_space = true;
env[i] = '\0';
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} 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);
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// 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);
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free(env);
return;
}
extern void
args_parse(args_info *args, int argc, char **argv)
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{
// Initialize those parts of *args that we need later.
args->files_name = NULL;
args->files_file = NULL;
args->files_delim = '\0';
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// Check how we were called.
{
// Remove the leading path name, if any.
const char *name = strrchr(argv[0], '/');
if (name == NULL)
name = argv[0];
else
++name;
// 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;
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}
}
// First the flags from the environment
parse_environment(args, argv[0], "XZ_DEFAULTS");
parse_environment(args, argv[0], "XZ_OPT");
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// Then from the command line
parse_real(args, argc, argv);
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// If encoder or decoder support was omitted at build time,
// show an error now so that the rest of the code can rely on
// that whatever is in opt_mode is also supported.
#ifndef HAVE_ENCODERS
if (opt_mode == MODE_COMPRESS)
message_fatal(_("Compression support was disabled "
"at build time"));
#endif
#ifndef HAVE_DECODERS
// Even MODE_LIST cannot work without decoder support so MODE_COMPRESS
// is the only valid choice.
if (opt_mode != MODE_COMPRESS)
message_fatal(_("Decompression support was disabled "
"at build time"));
#endif
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// 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();
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// 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;
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}
return;
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}
#ifndef NDEBUG
extern void
args_free(void)
{
free(opt_block_list);
return;
}
#endif