src/main.c

   1 /* Main program for the Midnight Commander
   2    Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
   3    2003, 2004, 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
   4
   5    Written by: 1994, 1995, 1996, 1997 Miguel de Icaza
   6    1994, 1995 Janne Kukonlehto
   7    1997 Norbert Warmuth
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  22
  23 /** \file main.c
  24  *  \brief Source: this is a main module
  25  */
  26
  27 #include <config.h>
  28
  29 #include <ctype.h>
  30 #include <errno.h>
  31 #include <locale.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <fcntl.h>
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 #include <sys/wait.h>
  39 #include <unistd.h>
  40 #include <pwd.h>                /* for username in xterm title */
  41
  42 #include "lib/global.h"
  43
  44 #include "lib/tty/tty.h"
  45 #include "lib/tty/key.h"        /* For init_key() */
  46 #include "lib/tty/win.h"        /* xterm_flag */
  47 #include "lib/skin.h"
  48 #include "lib/filehighlight.h"
  49 #include "lib/fileloc.h"
  50 #include "lib/strutil.h"
  51 #include "lib/util.h"
  52 #include "lib/vfs/mc-vfs/vfs.h" /* vfs_init(), vfs_shut() */
  53
  54 #include "filemanager/midnight.h"       /* current_panel */
  55 #include "filemanager/treestore.h"      /* tree_store_save */
  56 #include "filemanager/layout.h" /* command_prompt */
  57 #include "filemanager/ext.h"    /* flush_extension_file() */
  58 #include "filemanager/command.h"        /* cmdline */
  59
  60 #include "args.h"
  61 #include "subshell.h"
  62 #include "setup.h"              /* load_setup() */
  63
  64 #ifdef HAVE_CHARSET
  65 #include "lib/charsets.h"
  66 #include "selcodepage.h"
  67 #endif /* HAVE_CHARSET */
  68
  69 #include "consaver/cons.saver.h"        /* console_flag */
  70
  71 #include "main.h"
  72
  73 /*** global variables ****************************************************************************/
  74
  75 mc_fhl_t *mc_filehighlight;
  76
  77 /* Set when main loop should be terminated */
  78 int quit = 0;
  79
  80 #ifdef HAVE_CHARSET
  81 /* Numbers of (file I/O) and (input/display) codepages. -1 if not selected */
  82 int source_codepage = -1;
  83 int default_source_codepage = -1;
  84 int display_codepage = -1;
  85 char *autodetect_codeset = NULL;
  86 gboolean is_autodetect_codeset_enabled = FALSE;
  87 #else
  88 /* If true, allow characters in the range 160-255 */
  89 int eight_bit_clean = 1;
  90 /*
  91  * If true, also allow characters in the range 128-159.
  92  * This is reported to break on many terminals (xterm, qansi-m).
  93  */
  94 int full_eight_bits = 0;
  95 #endif /* !HAVE_CHARSET */
  96
  97 /*
  98  * If utf-8 terminal utf8_display = 1
  99  * Display bits set UTF-8
 100  */
 101 int utf8_display = 0;
 102
 103 /* If true use the internal viewer */
 104 int use_internal_view = 1;
 105 /* If set, use the builtin editor */
 106 int use_internal_edit = 1;
 107
 108 mc_run_mode_t mc_run_mode = MC_RUN_FULL;
 109 char *mc_run_param0 = NULL;
 110 char *mc_run_param1 = NULL;
 111
 112 /* Used so that widgets know if they are being destroyed or
 113    shut down */
 114 int midnight_shutdown = 0;
 115
 116 /* The user's shell */
 117 char *shell = NULL;
 118
 119 /* The prompt */
 120 const char *mc_prompt = NULL;
 121
 122 /* mc_sysconfig_dir: Area for default settings from maintainers of distributuves
 123   default is /etc/mc or may be defined by MC_DATADIR
 124   */
 125 char *mc_sysconfig_dir = NULL;
 126
 127 /* mc_share_data_dir: Area for default settings from developers */
 128 char *mc_share_data_dir = NULL;
 129
 130 /* Set to TRUE to suppress printing the last directory */
 131 int print_last_revert = FALSE;
 132
 133 /* If set, then print to the given file the last directory we were at */
 134 char *last_wd_string = NULL;
 135
 136 /*** file scope macro definitions ****************************************************************/
 137
 138 /*** file scope type declarations ****************************************************************/
 139
 140 /*** file scope variables ************************************************************************/
 141
 142 /*** file scope functions ************************************************************************/
 143 /* --------------------------------------------------------------------------------------------- */
 144
 145 static void
 146 check_codeset (void)
 147 {
 148     const char *current_system_codepage = NULL;
 149
 150     current_system_codepage = str_detect_termencoding ();
 151
 152 #ifdef HAVE_CHARSET
 153     {
 154         const char *_display_codepage;
 155
 156         _display_codepage = get_codepage_id (display_codepage);
 157
 158         if (strcmp (_display_codepage, current_system_codepage) != 0)
 159         {
 160             display_codepage = get_codepage_index (current_system_codepage);
 161             if (display_codepage == -1)
 162                 display_codepage = 0;
 163
 164             mc_config_set_string (mc_main_config, "Misc", "display_codepage", cp_display);
 165         }
 166     }
 167 #endif
 168
 169     utf8_display = str_isutf8 (current_system_codepage);
 170 }
 171
 172 /* --------------------------------------------------------------------------------------------- */
 173
 174 /** POSIX version.  The only version we support.  */
 175 static void
 176 OS_Setup (void)
 177 {
 178     const char *shell_env = getenv ("SHELL");
 179     const char *mc_libdir;
 180
 181     if ((shell_env == NULL) || (shell_env[0] == '\0'))
 182     {
 183         struct passwd *pwd;
 184         pwd = getpwuid (geteuid ());
 185         if (pwd != NULL)
 186             shell = g_strdup (pwd->pw_shell);
 187     }
 188     else
 189         shell = g_strdup (shell_env);
 190
 191     if ((shell == NULL) || (shell[0] == '\0'))
 192     {
 193         g_free (shell);
 194         shell = g_strdup ("/bin/sh");
 195     }
 196
 197     /* This is the directory, where MC was installed, on Unix this is DATADIR */
 198     /* and can be overriden by the MC_DATADIR environment variable */
 199     mc_libdir = getenv ("MC_DATADIR");
 200     if (mc_libdir != NULL)
 201     {
 202         mc_sysconfig_dir = g_strdup (mc_libdir);
 203         mc_share_data_dir = g_strdup (SYSCONFDIR);
 204     }
 205     else
 206     {
 207         mc_sysconfig_dir = g_strdup (SYSCONFDIR);
 208         mc_share_data_dir = g_strdup (DATADIR);
 209     }
 210
 211 }
 212
 213 /* --------------------------------------------------------------------------------------------- */
 214
 215 static void
 216 sigchld_handler_no_subshell (int sig)
 217 {
 218 #ifdef __linux__
 219     int pid, status;
 220
 221     if (!console_flag)
 222         return;
 223
 224     /* COMMENT: if it were true that after the call to handle_console(..INIT)
 225        the value of console_flag never changed, we could simply not install
 226        this handler at all if (!console_flag && !use_subshell). */
 227
 228     /* That comment is no longer true.  We need to wait() on a sigchld
 229        handler (that's at least what the tarfs code expects currently). */
 230
 231     pid = waitpid (cons_saver_pid, &status, WUNTRACED | WNOHANG);
 232
 233     if (pid == cons_saver_pid)
 234     {
 235
 236         if (WIFSTOPPED (status))
 237         {
 238             /* Someone has stopped cons.saver - restart it */
 239             kill (pid, SIGCONT);
 240         }
 241         else
 242         {
 243             /* cons.saver has died - disable console saving */
 244             handle_console (CONSOLE_DONE);
 245             console_flag = 0;
 246         }
 247     }
 248     /* If we got here, some other child exited; ignore it */
 249 #endif /* __linux__ */
 250
 251     (void) sig;
 252 }
 253
 254 /* --------------------------------------------------------------------------------------------- */
 255
 256 static void
 257 init_sigchld (void)
 258 {
 259     struct sigaction sigchld_action;
 260
 261     sigchld_action.sa_handler =
 262 #ifdef HAVE_SUBSHELL_SUPPORT
 263         use_subshell ? sigchld_handler :
 264 #endif /* HAVE_SUBSHELL_SUPPORT */
 265         sigchld_handler_no_subshell;
 266
 267     sigemptyset (&sigchld_action.sa_mask);
 268
 269 #ifdef SA_RESTART
 270     sigchld_action.sa_flags = SA_RESTART;
 271 #else
 272     sigchld_action.sa_flags = 0;
 273 #endif /* !SA_RESTART */
 274
 275     if (sigaction (SIGCHLD, &sigchld_action, NULL) == -1)
 276     {
 277 #ifdef HAVE_SUBSHELL_SUPPORT
 278         /*
 279          * This may happen on QNX Neutrino 6, where SA_RESTART
 280          * is defined but not implemented.  Fallback to no subshell.
 281          */
 282         use_subshell = 0;
 283 #endif /* HAVE_SUBSHELL_SUPPORT */
 284     }
 285 }
 286
 287 /* --------------------------------------------------------------------------------------------- */
 288 /*** public functions ****************************************************************************/
 289 /* --------------------------------------------------------------------------------------------- */
 290
 291 /** Define this function for glib-style error handling */
 292 GQuark
 293 mc_main_error_quark (void)
 294 {
 295     return g_quark_from_static_string (PACKAGE);
 296 }
 297
 298 /* --------------------------------------------------------------------------------------------- */
 299
 300 int
 301 do_cd (const char *new_dir, enum cd_enum exact)
 302 {
 303     gboolean res;
 304
 305     res = do_panel_cd (current_panel, new_dir, exact);
 306
 307 #if HAVE_CHARSET
 308     if (res)
 309     {
 310         const char *enc_name;
 311
 312         enc_name = vfs_get_encoding (current_panel->cwd);
 313         if (enc_name != NULL)
 314             current_panel->codepage = get_codepage_index (enc_name);
 315         else
 316             current_panel->codepage = SELECT_CHARSET_NO_TRANSLATE;
 317     }
 318 #endif /* HAVE_CHARSET */
 319
 320     return res ? 1 : 0;
 321 }
 322
 323 /* --------------------------------------------------------------------------------------------- */
 324
 325 #ifdef HAVE_SUBSHELL_SUPPORT
 326 int
 327 load_prompt (int fd, void *unused)
 328 {
 329     (void) fd;
 330     (void) unused;
 331
 332     if (!read_subshell_prompt ())
 333         return 0;
 334
 335     /* Don't actually change the prompt if it's invisible */
 336     if (((Dlg_head *) top_dlg->data == midnight_dlg) && command_prompt)
 337     {
 338         char *tmp_prompt;
 339         int prompt_len;
 340
 341         tmp_prompt = strip_ctrl_codes (subshell_prompt);
 342         prompt_len = str_term_width1 (tmp_prompt);
 343
 344         /* Check for prompts too big */
 345         if (COLS > 8 && prompt_len > COLS - 8)
 346         {
 347             prompt_len = COLS - 8;
 348             tmp_prompt[prompt_len] = '\0';
 349         }
 350         mc_prompt = tmp_prompt;
 351         label_set_text (the_prompt, mc_prompt);
 352         input_set_origin ((WInput *) cmdline, prompt_len, COLS - prompt_len);
 353
 354         /* since the prompt has changed, and we are called from one of the
 355          * tty_get_event channels, the prompt updating does not take place
 356          * automatically: force a cursor update and a screen refresh
 357          */
 358         update_cursor (midnight_dlg);
 359         mc_refresh ();
 360     }
 361     update_subshell_prompt = TRUE;
 362     return 0;
 363 }
 364 #endif /* HAVE_SUBSHELL_SUPPORT */
 365
 366 /* --------------------------------------------------------------------------------------------- */
 367
 368 /** Show current directory in the xterm title */
 369 void
 370 update_xterm_title_path (void)
 371 {
 372     /* TODO: share code with midnight_get_title () */
 373
 374     const char *path;
 375     char host[BUF_TINY];
 376     char *p;
 377     struct passwd *pw = NULL;
 378     char *login = NULL;
 379     int res = 0;
 380
 381     if (xterm_flag && xterm_title)
 382     {
 383         path = strip_home_and_password (current_panel->cwd);
 384         res = gethostname (host, sizeof (host));
 385         if (res)
 386         {                       /* On success, res = 0 */
 387             host[0] = '\0';
 388         }
 389         else
 390         {
 391             host[sizeof (host) - 1] = '\0';
 392         }
 393         pw = getpwuid (getuid ());
 394         if (pw)
 395         {
 396             login = g_strdup_printf ("%s@%s", pw->pw_name, host);
 397         }
 398         else
 399         {
 400             login = g_strdup (host);
 401         }
 402         p = g_strdup_printf ("mc [%s]:%s", login, path);
 403         fprintf (stdout, "\33]0;%s\7", str_term_form (p));
 404         g_free (login);
 405         g_free (p);
 406         if (!alternate_plus_minus)
 407             numeric_keypad_mode ();
 408         fflush (stdout);
 409     }
 410 }
 411
 412 /* --------------------------------------------------------------------------------------------- */
 413
 414 int
 415 main (int argc, char *argv[])
 416 {
 417     GError *error = NULL;
 418     gboolean isInitialized;
 419
 420     /* We had LC_CTYPE before, LC_ALL includs LC_TYPE as well */
 421     setlocale (LC_ALL, "");
 422     bindtextdomain ("mc", LOCALEDIR);
 423     textdomain ("mc");
 424
 425
 426     /* Set up temporary directory */
 427     mc_tmpdir ();
 428
 429     OS_Setup ();
 430
 431     str_init_strings (NULL);
 432
 433     vfs_init ();
 434
 435     if (!mc_args_handle (argc, argv, "mc"))
 436         exit (EXIT_FAILURE);
 437
 438     /* NOTE: This has to be called before tty_init or whatever routine
 439        calls any define_sequence */
 440     init_key ();
 441
 442     /* Must be done before installing the SIGCHLD handler [[FIXME]] */
 443     handle_console (CONSOLE_INIT);
 444
 445 #ifdef HAVE_SUBSHELL_SUPPORT
 446     /* Don't use subshell when invoked as viewer or editor */
 447     if (mc_run_mode != MC_RUN_FULL)
 448         use_subshell = 0;
 449
 450     if (use_subshell)
 451         subshell_get_console_attributes ();
 452 #endif /* HAVE_SUBSHELL_SUPPORT */
 453
 454     /* Install the SIGCHLD handler; must be done before init_subshell() */
 455     init_sigchld ();
 456
 457     /* We need this, since ncurses endwin () doesn't restore the signals */
 458     save_stop_handler ();
 459
 460     /* Initialize and create home directories */
 461     /* do it after the screen library initialization to show the error message */
 462     mc_config_init_config_paths (&error);
 463     if (error == NULL)
 464     {
 465         if (mc_config_deprecated_dir_present ())
 466         {
 467             mc_config_migrate_from_old_place (&error);
 468         }
 469     }
 470
 471     /* Must be done before init_subshell, to set up the terminal size: */
 472     /* FIXME: Should be removed and LINES and COLS computed on subshell */
 473     tty_init ((gboolean) mc_args__slow_terminal, (gboolean) mc_args__ugly_line_drawing);
 474
 475     load_setup ();
 476
 477     /* start check display_codepage and source_codepage */
 478     check_codeset ();
 479
 480     /* Removing this from the X code let's us type C-c */
 481     load_key_defs ();
 482
 483     load_keymap_defs ();
 484
 485     tty_init_colors (mc_args__disable_colors, mc_args__force_colors);
 486
 487     {
 488         GError *error2 = NULL;
 489         isInitialized = mc_skin_init (&error2);
 490         mc_filehighlight = mc_fhl_new (TRUE);
 491         dlg_set_default_colors ();
 492
 493         if (!isInitialized)
 494         {
 495             message (D_ERROR, _("Warning"), "%s", error2->message);
 496             g_error_free (error2);
 497             error2 = NULL;
 498         }
 499     }
 500
 501     if (error != NULL)
 502     {
 503         message (D_ERROR, _("Warning"), "%s", error->message);
 504         g_error_free (error);
 505         error = NULL;
 506     }
 507
 508
 509 #ifdef HAVE_SUBSHELL_SUPPORT
 510     /* Done here to ensure that the subshell doesn't  */
 511     /* inherit the file descriptors opened below, etc */
 512     if (use_subshell)
 513         init_subshell ();
 514
 515 #endif /* HAVE_SUBSHELL_SUPPORT */
 516
 517     /* Also done after init_subshell, to save any shell init file messages */
 518     if (console_flag)
 519         handle_console (CONSOLE_SAVE);
 520
 521     if (alternate_plus_minus)
 522         application_keypad_mode ();
 523
 524 #ifdef HAVE_SUBSHELL_SUPPORT
 525     if (use_subshell)
 526     {
 527         mc_prompt = strip_ctrl_codes (subshell_prompt);
 528         if (mc_prompt == NULL)
 529             mc_prompt = (geteuid () == 0) ? "# " : "$ ";
 530     }
 531     else
 532 #endif /* HAVE_SUBSHELL_SUPPORT */
 533         mc_prompt = (geteuid () == 0) ? "# " : "$ ";
 534
 535     /* Program main loop */
 536     if (!midnight_shutdown)
 537         do_nc ();
 538
 539     /* Save the tree store */
 540     tree_store_save ();
 541
 542     free_keymap_defs ();
 543
 544     /* Virtual File System shutdown */
 545     vfs_shut ();
 546
 547     flush_extension_file ();    /* does only free memory */
 548
 549     mc_fhl_free (&mc_filehighlight);
 550     mc_skin_deinit ();
 551     tty_colors_done ();
 552
 553     tty_shutdown ();
 554
 555     done_setup ();
 556
 557     if (console_flag && (quit & SUBSHELL_EXIT) == 0)
 558         handle_console (CONSOLE_RESTORE);
 559     if (alternate_plus_minus)
 560         numeric_keypad_mode ();
 561
 562     signal (SIGCHLD, SIG_DFL);  /* Disable the SIGCHLD handler */
 563
 564     if (console_flag)
 565         handle_console (CONSOLE_DONE);
 566
 567     if (mc_run_mode == MC_RUN_FULL && mc_args__last_wd_file != NULL
 568         && last_wd_string != NULL && !print_last_revert)
 569     {
 570         int last_wd_fd;
 571
 572         last_wd_fd = open (mc_args__last_wd_file, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL,
 573                            S_IRUSR | S_IWUSR);
 574         if (last_wd_fd != -1)
 575         {
 576             ssize_t ret1;
 577             int ret2;
 578             ret1 = write (last_wd_fd, last_wd_string, strlen (last_wd_string));
 579             ret2 = close (last_wd_fd);
 580         }
 581     }
 582     g_free (last_wd_string);
 583
 584     g_free (mc_share_data_dir);
 585     g_free (mc_sysconfig_dir);
 586     g_free (shell);
 587
 588     done_key ();
 589
 590     str_uninit_strings ();
 591
 592     g_free (mc_run_param0);
 593     g_free (mc_run_param1);
 594
 595     mc_config_deinit_config_paths ();
 596
 597     putchar ('\n');             /* Hack to make shell's prompt start at left of screen */
 598
 599     return 0;
 600 }
 601
 602 /* --------------------------------------------------------------------------------------------- */