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xz-archive/src/xz/main.c
Lasse Collin 88ccf47205 xz: Add incomplete support for --block-list.
It's broken with threads and when also --block-size is used.
2012-07-03 21:16:39 +03:00

307 lines
8.6 KiB
C

///////////////////////////////////////////////////////////////////////////////
//
/// \file main.c
/// \brief main()
//
// 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 <ctype.h>
/// Exit status to use. This can be changed with set_exit_status().
static enum exit_status_type exit_status = E_SUCCESS;
#if defined(_WIN32) && !defined(__CYGWIN__)
/// exit_status has to be protected with a critical section due to
/// how "signal handling" is done on Windows. See signals.c for details.
static CRITICAL_SECTION exit_status_cs;
#endif
/// True if --no-warn is specified. When this is true, we don't set
/// the exit status to E_WARNING when something worth a warning happens.
static bool no_warn = false;
extern void
set_exit_status(enum exit_status_type new_status)
{
assert(new_status == E_WARNING || new_status == E_ERROR);
#if defined(_WIN32) && !defined(__CYGWIN__)
EnterCriticalSection(&exit_status_cs);
#endif
if (exit_status != E_ERROR)
exit_status = new_status;
#if defined(_WIN32) && !defined(__CYGWIN__)
LeaveCriticalSection(&exit_status_cs);
#endif
return;
}
extern void
set_exit_no_warn(void)
{
no_warn = true;
return;
}
static const char *
read_name(const args_info *args)
{
// FIXME: Maybe we should have some kind of memory usage limit here
// like the tool has for the actual compression and decompression.
// Giving some huge text file with --files0 makes us to read the
// whole file in RAM.
static char *name = NULL;
static size_t size = 256;
// Allocate the initial buffer. This is never freed, since after it
// is no longer needed, the program exits very soon. It is safe to
// use xmalloc() and xrealloc() in this function, because while
// executing this function, no files are open for writing, and thus
// there's no need to cleanup anything before exiting.
if (name == NULL)
name = xmalloc(size);
// Write position in name
size_t pos = 0;
// Read one character at a time into name.
while (!user_abort) {
const int c = fgetc(args->files_file);
if (ferror(args->files_file)) {
// Take care of EINTR since we have established
// the signal handlers already.
if (errno == EINTR)
continue;
message_error(_("%s: Error reading filenames: %s"),
args->files_name, strerror(errno));
return NULL;
}
if (feof(args->files_file)) {
if (pos != 0)
message_error(_("%s: Unexpected end of input "
"when reading filenames"),
args->files_name);
return NULL;
}
if (c == args->files_delim) {
// We allow consecutive newline (--files) or '\0'
// characters (--files0), and ignore such empty
// filenames.
if (pos == 0)
continue;
// A non-empty name was read. Terminate it with '\0'
// and return it.
name[pos] = '\0';
return name;
}
if (c == '\0') {
// A null character was found when using --files,
// which expects plain text input separated with
// newlines.
message_error(_("%s: Null character found when "
"reading filenames; maybe you meant "
"to use `--files0' instead "
"of `--files'?"), args->files_name);
return NULL;
}
name[pos++] = c;
// Allocate more memory if needed. There must always be space
// at least for one character to allow terminating the string
// with '\0'.
if (pos == size) {
size *= 2;
name = xrealloc(name, size);
}
}
return NULL;
}
int
main(int argc, char **argv)
{
#if defined(_WIN32) && !defined(__CYGWIN__)
InitializeCriticalSection(&exit_status_cs);
#endif
// Set up the progname variable.
tuklib_progname_init(argv);
// Initialize the file I/O. This makes sure that
// stdin, stdout, and stderr are something valid.
io_init();
// Set up the locale and message translations.
tuklib_gettext_init(PACKAGE, LOCALEDIR);
// Initialize handling of error/warning/other messages.
message_init();
// Set hardware-dependent default values. These can be overriden
// on the command line, thus this must be done before args_parse().
hardware_init();
// Parse the command line arguments and get an array of filenames.
// This doesn't return if something is wrong with the command line
// arguments. If there are no arguments, one filename ("-") is still
// returned to indicate stdin.
args_info args;
args_parse(&args, argc, argv);
if (opt_mode != MODE_LIST && opt_robot)
message_fatal(_("Compression and decompression with --robot "
"are not supported yet."));
// Tell the message handling code how many input files there are if
// we know it. This way the progress indicator can show it.
if (args.files_name != NULL)
message_set_files(0);
else
message_set_files(args.arg_count);
// Refuse to write compressed data to standard output if it is
// a terminal.
if (opt_mode == MODE_COMPRESS) {
if (opt_stdout || (args.arg_count == 1
&& strcmp(args.arg_names[0], "-") == 0)) {
if (is_tty_stdout()) {
message_try_help();
tuklib_exit(E_ERROR, E_ERROR, false);
}
}
}
// Set up the signal handlers. We don't need these before we
// start the actual action and not in --list mode, so this is
// done after parsing the command line arguments.
//
// It's good to keep signal handlers in normal compression and
// decompression modes even when only writing to stdout, because
// we might need to restore O_APPEND flag on stdout before exiting.
// In --test mode, signal handlers aren't really needed, but let's
// keep them there for consistency with normal decompression.
if (opt_mode != MODE_LIST)
signals_init();
// coder_run() handles compression, decompression, and testing.
// list_file() is for --list.
void (*run)(const char *filename) = opt_mode == MODE_LIST
? &list_file : &coder_run;
// Process the files given on the command line. Note that if no names
// were given, args_parse() gave us a fake "-" filename.
for (size_t i = 0; i < args.arg_count && !user_abort; ++i) {
if (strcmp("-", args.arg_names[i]) == 0) {
// Processing from stdin to stdout. Check that we
// aren't writing compressed data to a terminal or
// reading it from a terminal.
if (opt_mode == MODE_COMPRESS) {
if (is_tty_stdout())
continue;
} else if (is_tty_stdin()) {
continue;
}
// It doesn't make sense to compress data from stdin
// if we are supposed to read filenames from stdin
// too (enabled with --files or --files0).
if (args.files_name == stdin_filename) {
message_error(_("Cannot read data from "
"standard input when "
"reading filenames "
"from standard input"));
continue;
}
// Replace the "-" with a special pointer, which is
// recognized by coder_run() and other things.
// This way error messages get a proper filename
// string and the code still knows that it is
// handling the special case of stdin.
args.arg_names[i] = (char *)stdin_filename;
}
// Do the actual compression or decompression.
run(args.arg_names[i]);
}
// If --files or --files0 was used, process the filenames from the
// given file or stdin. Note that here we don't consider "-" to
// indicate stdin like we do with the command line arguments.
if (args.files_name != NULL) {
// read_name() checks for user_abort so we don't need to
// check it as loop termination condition.
while (true) {
const char *name = read_name(&args);
if (name == NULL)
break;
// read_name() doesn't return empty names.
assert(name[0] != '\0');
run(name);
}
if (args.files_name != stdin_filename)
(void)fclose(args.files_file);
}
// All files have now been handled. If in --list mode, display
// the totals before exiting. We don't have signal handlers
// enabled in --list mode, so we don't need to check user_abort.
if (opt_mode == MODE_LIST) {
assert(!user_abort);
list_totals();
}
#ifndef NDEBUG
coder_free();
args_free();
#endif
// If we have got a signal, raise it to kill the program instead
// of calling tuklib_exit().
signals_exit();
// Make a local copy of exit_status to keep the Windows code
// thread safe. At this point it is fine if we miss the user
// pressing C-c and don't set the exit_status to E_ERROR on
// Windows.
#if defined(_WIN32) && !defined(__CYGWIN__)
EnterCriticalSection(&exit_status_cs);
#endif
enum exit_status_type es = exit_status;
#if defined(_WIN32) && !defined(__CYGWIN__)
LeaveCriticalSection(&exit_status_cs);
#endif
// Suppress the exit status indicating a warning if --no-warn
// was specified.
if (es == E_WARNING && no_warn)
es = E_SUCCESS;
tuklib_exit(es, E_ERROR, message_verbosity_get() != V_SILENT);
}