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///////////////////////////////////////////////////////////////////////////////
//
/// \file main.c
/// \brief main()
//
// Copyright (C) 2007 Lasse Collin
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, 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
// Lesser General Public License for more details.
//
///////////////////////////////////////////////////////////////////////////////
#include "private.h"
#include "open_stdxxx.h"
#include <ctype.h>
static sig_atomic_t exit_signal = 0;
static void
signal_handler(int sig)
{
// FIXME Is this thread-safe together with main()?
exit_signal = sig;
user_abort = 1;
return;
}
static void
establish_signal_handlers(void)
{
struct sigaction sa;
sa.sa_handler = &signal_handler;
sigfillset(&sa.sa_mask);
sa.sa_flags = 0;
static const int sigs[] = {
SIGHUP,
SIGINT,
SIGPIPE,
SIGTERM,
SIGXCPU,
SIGXFSZ,
};
for (size_t i = 0; i < sizeof(sigs) / sizeof(sigs[0]); ++i) {
if (sigaction(sigs[i], &sa, NULL)) {
errmsg(V_ERROR, _("Cannot establish signal handlers"));
my_exit(ERROR);
}
}
/*
SIGINFO/SIGUSR1 for status reporting?
*/
}
static bool
is_tty_stdin(void)
{
const bool ret = isatty(STDIN_FILENO);
if (ret) {
// FIXME: Other threads may print between these lines.
// Maybe that should be fixed. Not a big issue in practice.
errmsg(V_ERROR, _("Compressed data not read from "
"a terminal."));
errmsg(V_ERROR, _("Use `--force' to force decompression."));
show_try_help();
}
return ret;
}
static bool
is_tty_stdout(void)
{
const bool ret = isatty(STDOUT_FILENO);
if (ret) {
errmsg(V_ERROR, _("Compressed data not written to "
"a terminal."));
errmsg(V_ERROR, _("Use `--force' to force decompression."));
show_try_help();
}
return ret;
}
static char *
read_name(void)
{
size_t size = 256;
size_t pos = 0;
char *name = malloc(size);
if (name == NULL) {
out_of_memory();
return NULL;
}
while (true) {
const int c = fgetc(opt_files_file);
if (c == EOF) {
free(name);
if (ferror(opt_files_file))
errmsg(V_ERROR, _("%s: Error reading "
"filenames: %s"),
opt_files_name,
strerror(errno));
else if (pos != 0)
errmsg(V_ERROR, _("%s: Unexpected end of "
"input when reading "
"filenames"), opt_files_name);
return NULL;
}
if (c == '\0' || c == opt_files_split)
break;
name[pos++] = c;
if (pos == size) {
size *= 2;
char *tmp = realloc(name, size);
if (tmp == NULL) {
free(name);
out_of_memory();
return NULL;
}
name = tmp;
}
}
if (name != NULL)
name[pos] = '\0';
return name;
}
int
main(int argc, char **argv)
{
// Make sure that stdin, stdout, and and stderr are connected to
// a valid file descriptor. Exit immediatelly with exit code ERROR
// if we cannot make the file descriptors valid. Maybe we should
// print an error message, but our stderr could be screwed anyway.
open_stdxxx(ERROR);
// Set the program invocation name used in various messages.
argv0 = argv[0];
setlocale(LC_ALL, "en_US.UTF-8");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
// Set hardware-dependent default values. These can be overriden
// on the command line, thus this must be done before parse_args().
hardware_init();
char **files = parse_args(argc, argv);
if (opt_mode == MODE_COMPRESS && opt_stdout && is_tty_stdout())
return ERROR;
if (opt_mode == MODE_COMPRESS)
lzma_init_encoder();
else
lzma_init_decoder();
io_init();
process_init();
if (opt_mode == MODE_LIST) {
errmsg(V_ERROR, "--list is not implemented yet.");
my_exit(ERROR);
}
// Hook the signal handlers. We don't need these before we start
// the actual action, so this is done after parsing the command
// line arguments.
establish_signal_handlers();
while (*files != NULL && !user_abort) {
if (strcmp("-", *files) == 0) {
if (!opt_force) {
if (opt_mode == MODE_COMPRESS) {
if (is_tty_stdout()) {
++files;
continue;
}
} else if (is_tty_stdin()) {
++files;
continue;
}
}
if (opt_files_name == stdin_filename) {
errmsg(V_ERROR, _("Cannot read data from "
"standard input when "
"reading filenames "
"from standard input"));
++files;
continue;
}
*files = (char *)stdin_filename;
}
process_file(*files++);
}
if (opt_files_name != NULL) {
while (true) {
char *name = read_name();
if (name == NULL)
break;
if (name[0] != '\0')
process_file(name);
free(name);
}
if (opt_files_name != stdin_filename)
(void)fclose(opt_files_file);
}
io_finish();
if (exit_signal != 0) {
struct sigaction sa;
sa.sa_handler = SIG_DFL;
sigfillset(&sa.sa_mask);
sa.sa_flags = 0;
sigaction(exit_signal, &sa, NULL);
raise(exit_signal);
}
my_exit(exit_status);
}
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