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