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 /* macro stuff */
 115 struct macro_action_t record_macro_buf[MAX_MACRO_LENGTH];
 116
 117 GArray *macros_list;
 118
 119 /*** file scope macro definitions ****************************************************************/
 120
 121 /*** file scope type declarations ****************************************************************/
 122
 123 /*** file scope variables ************************************************************************/
 124
 125 /*** file scope functions ************************************************************************/
 126 /* --------------------------------------------------------------------------------------------- */
 127
 128 static void
 129 check_codeset (void)
 130 {
 131     const char *current_system_codepage = NULL;
 132
 133     current_system_codepage = str_detect_termencoding ();
 134
 135 #ifdef HAVE_CHARSET
 136     {
 137         const char *_display_codepage;
 138
 139         _display_codepage = get_codepage_id (mc_global.display_codepage);
 140
 141         if (strcmp (_display_codepage, current_system_codepage) != 0)
 142         {
 143             mc_global.display_codepage = get_codepage_index (current_system_codepage);
 144             if (mc_global.display_codepage == -1)
 145                 mc_global.display_codepage = 0;
 146
 147             mc_config_set_string (mc_main_config, "Misc", "display_codepage", cp_display);
 148         }
 149     }
 150 #endif
 151
 152     mc_global.utf8_display = str_isutf8 (current_system_codepage);
 153 }
 154
 155 /* --------------------------------------------------------------------------------------------- */
 156
 157 /** POSIX version.  The only version we support.  */
 158 static void
 159 OS_Setup (void)
 160 {
 161     const char *shell_env = getenv ("SHELL");
 162
 163     if ((shell_env == NULL) || (shell_env[0] == '\0'))
 164     {
 165         struct passwd *pwd;
 166         pwd = getpwuid (geteuid ());
 167         if (pwd != NULL)
 168             shell = g_strdup (pwd->pw_shell);
 169     }
 170     else
 171         shell = g_strdup (shell_env);
 172
 173     if ((shell == NULL) || (shell[0] == '\0'))
 174     {
 175         g_free (shell);
 176         shell = g_strdup ("/bin/sh");
 177     }
 178 }
 179
 180 /* --------------------------------------------------------------------------------------------- */
 181
 182 static void
 183 sigchld_handler_no_subshell (int sig)
 184 {
 185 #ifdef __linux__
 186     int pid, status;
 187
 188     if (!mc_global.tty.console_flag)
 189         return;
 190
 191     /* COMMENT: if it were true that after the call to handle_console(..INIT)
 192        the value of mc_global.tty.console_flag never changed, we could simply not install
 193        this handler at all if (!mc_global.tty.console_flag && !mc_global.tty.use_subshell). */
 194
 195     /* That comment is no longer true.  We need to wait() on a sigchld
 196        handler (that's at least what the tarfs code expects currently). */
 197
 198     pid = waitpid (cons_saver_pid, &status, WUNTRACED | WNOHANG);
 199
 200     if (pid == cons_saver_pid)
 201     {
 202
 203         if (WIFSTOPPED (status))
 204         {
 205             /* Someone has stopped cons.saver - restart it */
 206             kill (pid, SIGCONT);
 207         }
 208         else
 209         {
 210             /* cons.saver has died - disable console saving */
 211             handle_console (CONSOLE_DONE);
 212             mc_global.tty.console_flag = '\0';
 213         }
 214     }
 215     /* If we got here, some other child exited; ignore it */
 216 #endif /* __linux__ */
 217
 218     (void) sig;
 219 }
 220
 221 /* --------------------------------------------------------------------------------------------- */
 222
 223 static void
 224 init_sigchld (void)
 225 {
 226     struct sigaction sigchld_action;
 227
 228     sigchld_action.sa_handler =
 229 #ifdef HAVE_SUBSHELL_SUPPORT
 230         mc_global.tty.use_subshell ? sigchld_handler :
 231 #endif /* HAVE_SUBSHELL_SUPPORT */
 232         sigchld_handler_no_subshell;
 233
 234     sigemptyset (&sigchld_action.sa_mask);
 235
 236 #ifdef SA_RESTART
 237     sigchld_action.sa_flags = SA_RESTART;
 238 #else
 239     sigchld_action.sa_flags = 0;
 240 #endif /* !SA_RESTART */
 241
 242     if (sigaction (SIGCHLD, &sigchld_action, NULL) == -1)
 243     {
 244 #ifdef HAVE_SUBSHELL_SUPPORT
 245         /*
 246          * This may happen on QNX Neutrino 6, where SA_RESTART
 247          * is defined but not implemented.  Fallback to no subshell.
 248          */
 249         mc_global.tty.use_subshell = FALSE;
 250 #endif /* HAVE_SUBSHELL_SUPPORT */
 251     }
 252 }
 253
 254 /* --------------------------------------------------------------------------------------------- */
 255 /*** public functions ****************************************************************************/
 256 /* --------------------------------------------------------------------------------------------- */
 257
 258 int
 259 do_cd (const char *new_dir, enum cd_enum exact)
 260 {
 261     gboolean res;
 262
 263     res = do_panel_cd (current_panel, new_dir, exact);
 264
 265 #if HAVE_CHARSET
 266     if (res)
 267     {
 268         vfs_path_t *vpath = vfs_path_from_str (current_panel->cwd);
 269         vfs_path_element_t *path_element = vfs_path_get_by_index (vpath, -1);
 270
 271         if (path_element->encoding != NULL)
 272             current_panel->codepage = get_codepage_index (path_element->encoding);
 273         else
 274             current_panel->codepage = SELECT_CHARSET_NO_TRANSLATE;
 275
 276         vfs_path_free (vpath);
 277     }
 278 #endif /* HAVE_CHARSET */
 279
 280     return res ? 1 : 0;
 281 }
 282
 283 /* --------------------------------------------------------------------------------------------- */
 284
 285 #ifdef HAVE_SUBSHELL_SUPPORT
 286 int
 287 load_prompt (int fd, void *unused)
 288 {
 289     (void) fd;
 290     (void) unused;
 291
 292     if (!read_subshell_prompt ())
 293         return 0;
 294
 295     /* Don't actually change the prompt if it's invisible */
 296     if (((Dlg_head *) top_dlg->data == midnight_dlg) && command_prompt)
 297     {
 298         char *tmp_prompt;
 299         int prompt_len;
 300
 301         tmp_prompt = strip_ctrl_codes (subshell_prompt);
 302         prompt_len = str_term_width1 (tmp_prompt);
 303
 304         /* Check for prompts too big */
 305         if (COLS > 8 && prompt_len > COLS - 8)
 306         {
 307             prompt_len = COLS - 8;
 308             tmp_prompt[prompt_len] = '\0';
 309         }
 310         mc_prompt = tmp_prompt;
 311         label_set_text (the_prompt, mc_prompt);
 312         input_set_origin ((WInput *) cmdline, prompt_len, COLS - prompt_len);
 313
 314         /* since the prompt has changed, and we are called from one of the
 315          * tty_get_event channels, the prompt updating does not take place
 316          * automatically: force a cursor update and a screen refresh
 317          */
 318         update_cursor (midnight_dlg);
 319         mc_refresh ();
 320     }
 321     update_subshell_prompt = TRUE;
 322     return 0;
 323 }
 324 #endif /* HAVE_SUBSHELL_SUPPORT */
 325
 326 /* --------------------------------------------------------------------------------------------- */
 327
 328 /** Show current directory in the xterm title */
 329 void
 330 update_xterm_title_path (void)
 331 {
 332     /* TODO: share code with midnight_get_title () */
 333
 334     const char *path;
 335     char host[BUF_TINY];
 336     char *p;
 337     struct passwd *pw = NULL;
 338     char *login = NULL;
 339     int res = 0;
 340
 341     if (xterm_flag && xterm_title)
 342     {
 343         path = strip_home_and_password (current_panel->cwd);
 344         res = gethostname (host, sizeof (host));
 345         if (res)
 346         {                       /* On success, res = 0 */
 347             host[0] = '\0';
 348         }
 349         else
 350         {
 351             host[sizeof (host) - 1] = '\0';
 352         }
 353         pw = getpwuid (getuid ());
 354         if (pw)
 355         {
 356             login = g_strdup_printf ("%s@%s", pw->pw_name, host);
 357         }
 358         else
 359         {
 360             login = g_strdup (host);
 361         }
 362         p = g_strdup_printf ("mc [%s]:%s", login, path);
 363         fprintf (stdout, "\33]0;%s\7", str_term_form (p));
 364         g_free (login);
 365         g_free (p);
 366         if (!alternate_plus_minus)
 367             numeric_keypad_mode ();
 368         fflush (stdout);
 369     }
 370 }
 371
 372 /* --------------------------------------------------------------------------------------------- */
 373
 374 int
 375 main (int argc, char *argv[])
 376 {
 377     GError *error = NULL;
 378     gboolean isInitialized;
 379
 380     /* We had LC_CTYPE before, LC_ALL includs LC_TYPE as well */
 381     setlocale (LC_ALL, "");
 382     bindtextdomain ("mc", LOCALEDIR);
 383     textdomain ("mc");
 384
 385     if (!events_init (&error))
 386     {
 387         fprintf (stderr, _("Failed to run:\n%s\n"), error->message);
 388         g_error_free (error);
 389         (void) mc_event_deinit (NULL);
 390         exit (EXIT_FAILURE);
 391     }
 392
 393     /* Set up temporary directory */
 394     mc_tmpdir ();
 395
 396     OS_Setup ();
 397
 398     str_init_strings (NULL);
 399
 400     /* Initialize and create home directories */
 401     /* do it after the screen library initialization to show the error message */
 402     mc_config_init_config_paths (&error);
 403
 404     if (error == NULL && mc_config_deprecated_dir_present ())
 405         mc_config_migrate_from_old_place (&error);
 406
 407     vfs_init ();
 408     vfs_plugins_init ();
 409     vfs_setup_work_dir ();
 410
 411     if (!mc_args_handle (argc, argv, "mc"))
 412         exit (EXIT_FAILURE);
 413
 414     /* NOTE: This has to be called before tty_init or whatever routine
 415        calls any define_sequence */
 416     init_key ();
 417
 418     /* Must be done before installing the SIGCHLD handler [[FIXME]] */
 419     handle_console (CONSOLE_INIT);
 420
 421 #ifdef HAVE_SUBSHELL_SUPPORT
 422     /* Don't use subshell when invoked as viewer or editor */
 423     if (mc_global.mc_run_mode != MC_RUN_FULL)
 424         mc_global.tty.use_subshell = FALSE;
 425
 426     if (mc_global.tty.use_subshell)
 427         subshell_get_console_attributes ();
 428 #endif /* HAVE_SUBSHELL_SUPPORT */
 429
 430     /* Install the SIGCHLD handler; must be done before init_subshell() */
 431     init_sigchld ();
 432
 433     /* We need this, since ncurses endwin () doesn't restore the signals */
 434     save_stop_handler ();
 435
 436     /* Must be done before init_subshell, to set up the terminal size: */
 437     /* FIXME: Should be removed and LINES and COLS computed on subshell */
 438     tty_init (mc_global.args.slow_terminal, mc_global.args.ugly_line_drawing);
 439
 440     load_setup ();
 441
 442     /* start check mc_global.display_codepage and mc_global.source_codepage */
 443     check_codeset ();
 444
 445     /* Removing this from the X code let's us type C-c */
 446     load_key_defs ();
 447
 448     load_keymap_defs (!mc_args__nokeymap);
 449
 450     macros_list = g_array_new (TRUE, FALSE, sizeof (macros_t));
 451
 452     tty_init_colors (mc_global.args.disable_colors, mc_args__force_colors);
 453
 454     {
 455         GError *error2 = NULL;
 456         isInitialized = mc_skin_init (&error2);
 457         mc_filehighlight = mc_fhl_new (TRUE);
 458         dlg_set_default_colors ();
 459
 460         if (!isInitialized)
 461         {
 462             message (D_ERROR, _("Warning"), "%s", error2->message);
 463             g_error_free (error2);
 464             error2 = NULL;
 465         }
 466     }
 467
 468     if (error != NULL)
 469     {
 470         message (D_ERROR, _("Warning"), "%s", error->message);
 471         g_error_free (error);
 472         error = NULL;
 473     }
 474
 475
 476 #ifdef HAVE_SUBSHELL_SUPPORT
 477     /* Done here to ensure that the subshell doesn't  */
 478     /* inherit the file descriptors opened below, etc */
 479     if (mc_global.tty.use_subshell)
 480         init_subshell ();
 481
 482 #endif /* HAVE_SUBSHELL_SUPPORT */
 483
 484     /* Also done after init_subshell, to save any shell init file messages */
 485     if (mc_global.tty.console_flag)
 486         handle_console (CONSOLE_SAVE);
 487
 488     if (alternate_plus_minus)
 489         application_keypad_mode ();
 490
 491 #ifdef HAVE_SUBSHELL_SUPPORT
 492     if (mc_global.tty.use_subshell)
 493     {
 494         mc_prompt = strip_ctrl_codes (subshell_prompt);
 495         if (mc_prompt == NULL)
 496             mc_prompt = (geteuid () == 0) ? "# " : "$ ";
 497     }
 498     else
 499 #endif /* HAVE_SUBSHELL_SUPPORT */
 500         mc_prompt = (geteuid () == 0) ? "# " : "$ ";
 501
 502     /* Program main loop */
 503     if (!mc_global.widget.midnight_shutdown)
 504         do_nc ();
 505
 506     /* Save the tree store */
 507     tree_store_save ();
 508
 509     free_keymap_defs ();
 510
 511     /* Virtual File System shutdown */
 512     vfs_shut ();
 513
 514     flush_extension_file ();    /* does only free memory */
 515
 516     mc_fhl_free (&mc_filehighlight);
 517     mc_skin_deinit ();
 518     tty_colors_done ();
 519
 520     tty_shutdown ();
 521
 522     done_setup ();
 523
 524     if (mc_global.tty.console_flag && (quit & SUBSHELL_EXIT) == 0)
 525         handle_console (CONSOLE_RESTORE);
 526     if (alternate_plus_minus)
 527         numeric_keypad_mode ();
 528
 529     signal (SIGCHLD, SIG_DFL);  /* Disable the SIGCHLD handler */
 530
 531     if (mc_global.tty.console_flag)
 532         handle_console (CONSOLE_DONE);
 533
 534     if (mc_global.mc_run_mode == MC_RUN_FULL && mc_args__last_wd_file != NULL
 535         && last_wd_string != NULL && !print_last_revert)
 536     {
 537         int last_wd_fd;
 538
 539         last_wd_fd = open (mc_args__last_wd_file, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL,
 540                            S_IRUSR | S_IWUSR);
 541         if (last_wd_fd != -1)
 542         {
 543             ssize_t ret1;
 544             int ret2;
 545             ret1 = write (last_wd_fd, last_wd_string, strlen (last_wd_string));
 546             ret2 = close (last_wd_fd);
 547         }
 548     }
 549     g_free (last_wd_string);
 550
 551     g_free (shell);
 552
 553     done_key ();
 554
 555     if (macros_list != NULL)
 556     {
 557         guint i;
 558         macros_t *macros;
 559         for (i = 0; i < macros_list->len; i++)
 560         {
 561             macros = &g_array_index (macros_list, struct macros_t, i);
 562             if (macros != NULL && macros->macro != NULL)
 563                 g_array_free (macros->macro, FALSE);
 564         }
 565         g_array_free (macros_list, TRUE);
 566     }
 567
 568     str_uninit_strings ();
 569
 570     g_free (mc_run_param0);
 571     g_free (mc_run_param1);
 572
 573     mc_event_deinit (&error);
 574
 575     mc_config_deinit_config_paths ();
 576
 577     if (error != NULL)
 578     {
 579         fprintf (stderr, _("\nFailed while close:\n%s\n"), error->message);
 580         g_error_free (error);
 581         exit (EXIT_FAILURE);
 582     }
 583
 584     putchar ('\n');             /* Hack to make shell's prompt start at left of screen */
 585
 586     return 0;
 587 }
 588
 589 /* --------------------------------------------------------------------------------------------- */