src/viewer/lib.c

   1 /*
   2    Internal file viewer for the Midnight Commander
   3    Common finctions (used from some other mcviewer functions)
   4
   5    Copyright (C) 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003,
   6    2004, 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
   7
   8    Written by: 1994, 1995, 1998 Miguel de Icaza
   9                1994, 1995 Janne Kukonlehto
  10                1995 Jakub Jelinek
  11                1996 Joseph M. Hinkle
  12                1997 Norbert Warmuth
  13                1998 Pavel Machek
  14                2004 Roland Illig <roland.illig@gmx.de>
  15                2005 Roland Illig <roland.illig@gmx.de>
  16                2009 Slava Zanko <slavazanko@google.com>
  17                2009 Andrew Borodin <aborodin@vmail.ru>
  18                2009 Ilia Maslakov <il.smind@gmail.com>
  19
  20    This file is part of the Midnight Commander.
  21
  22    The Midnight Commander is free software; you can redistribute it
  23    and/or modify it under the terms of the GNU General Public License as
  24    published by the Free Software Foundation; either version 2 of the
  25    License, or (at your option) any later version.
  26
  27    The Midnight Commander is distributed in the hope that it will be
  28    useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  29    of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  30    General Public License for more details.
  31
  32    You should have received a copy of the GNU General Public License
  33    along with this program; if not, write to the Free Software
  34    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  35    MA 02110-1301, USA.
  36  */
  37
  38 #include <config.h>
  39
  40 #include <limits.h>
  41
  42 #include "../src/global.h"
  43 #include "../src/wtools.h"
  44 #include "../src/strutil.h"
  45 #include "../src/main.h"
  46 #include "../src/charsets.h"
  47 #include "../src/selcodepage.h"
  48 #include "internal.h"
  49 #include "mcviewer.h"
  50
  51 /*** global variables ****************************************************************************/
  52
  53 #define OFF_T_BITWIDTH (unsigned int) (sizeof (off_t) * CHAR_BIT - 1)
  54 const off_t INVALID_OFFSET = (off_t) - 1;
  55 const off_t OFFSETTYPE_MAX = ((off_t) 1 << (OFF_T_BITWIDTH - 1)) - 1;
  56
  57 /*** file scope macro definitions ****************************************************************/
  58
  59 /*** file scope type declarations ****************************************************************/
  60
  61 /*** file scope variables ************************************************************************/
  62
  63 /*** file scope functions ************************************************************************/
  64
  65 /*** public functions ****************************************************************************/
  66
  67 /* --------------------------------------------------------------------------------------------- */
  68
  69 void
  70 mcview_toggle_magic_mode (mcview_t * view)
  71 {
  72     char *filename, *command;
  73
  74     mcview_altered_magic_flag = 1;
  75     view->magic_mode = !view->magic_mode;
  76     filename = g_strdup (view->filename);
  77     command = g_strdup (view->command);
  78
  79     mcview_done (view);
  80     mcview_load (view, command, filename, 0);
  81     g_free (filename);
  82     g_free (command);
  83     view->dpy_bbar_dirty = TRUE;
  84     view->dirty++;
  85 }
  86
  87 /* --------------------------------------------------------------------------------------------- */
  88
  89 void
  90 mcview_toggle_wrap_mode (mcview_t * view)
  91 {
  92     view->text_wrap_mode = !view->text_wrap_mode;
  93     if (view->text_wrap_mode) {
  94         mcview_scroll_to_cursor (view);
  95     } else {
  96         off_t line;
  97
  98         mcview_offset_to_coord (view, &line, &(view->dpy_text_column), view->dpy_start);
  99         mcview_coord_to_offset (view, &(view->dpy_start), line, 0);
 100     }
 101     view->dpy_bbar_dirty = TRUE;
 102     view->dirty++;
 103 }
 104
 105 /* --------------------------------------------------------------------------------------------- */
 106
 107 void
 108 mcview_toggle_nroff_mode (mcview_t * view)
 109 {
 110     view->text_nroff_mode = !view->text_nroff_mode;
 111     mcview_altered_nroff_flag = 1;
 112     view->dpy_bbar_dirty = TRUE;
 113     view->dirty++;
 114 }
 115
 116 /* --------------------------------------------------------------------------------------------- */
 117
 118 void
 119 mcview_toggle_hex_mode (mcview_t * view)
 120 {
 121     view->hex_mode = !view->hex_mode;
 122
 123     if (view->hex_mode) {
 124         view->hex_cursor = view->dpy_start;
 125         view->dpy_start = mcview_offset_rounddown (view->dpy_start, view->bytes_per_line);
 126         view->widget.options |= W_WANT_CURSOR;
 127     } else {
 128         view->dpy_start = view->hex_cursor;
 129         mcview_moveto_bol (view);
 130         view->widget.options &= ~W_WANT_CURSOR;
 131     }
 132     mcview_altered_hex_mode = 1;
 133     view->dpy_bbar_dirty = TRUE;
 134     view->dirty++;
 135 }
 136
 137 /* --------------------------------------------------------------------------------------------- */
 138
 139 gboolean
 140 mcview_ok_to_quit (mcview_t * view)
 141 {
 142     int r;
 143
 144     if (view->change_list == NULL)
 145         return TRUE;
 146
 147     r = query_dialog (_("Quit"),
 148                       _(" File was modified, Save with exit? "), D_NORMAL, 3,
 149                       _("&Cancel quit"), _("&Yes"), _("&No"));
 150
 151     switch (r) {
 152     case 1:
 153         return mcview_hexedit_save_changes (view);
 154     case 2:
 155         mcview_hexedit_free_change_list (view);
 156         return TRUE;
 157     default:
 158         return FALSE;
 159     }
 160 }
 161
 162 /* --------------------------------------------------------------------------------------------- */
 163
 164 void
 165 mcview_done (mcview_t * view)
 166 {
 167     /* Save current file position */
 168     if (mcview_remember_file_position && view->filename != NULL) {
 169         char *canon_fname;
 170         off_t line, col;
 171
 172         canon_fname = vfs_canon (view->filename);
 173         mcview_offset_to_coord (view, &line, &col, view->dpy_start);
 174         save_file_position (canon_fname, line + 1, col);
 175         g_free (canon_fname);
 176     }
 177
 178     /* Write back the global viewer mode */
 179     mcview_default_hex_mode = view->hex_mode;
 180     mcview_default_nroff_flag = view->text_nroff_mode;
 181     mcview_default_magic_flag = view->magic_mode;
 182     mcview_global_wrap_mode = view->text_wrap_mode;
 183
 184     /* Free memory used by the viewer */
 185
 186     /* view->widget needs no destructor */
 187
 188     g_free (view->filename), view->filename = NULL;
 189     g_free (view->command), view->command = NULL;
 190
 191     mcview_close_datasource (view);
 192     /* the growing buffer is freed with the datasource */
 193
 194     if (view->coord_cache) {
 195         g_array_free (view->coord_cache, TRUE), view->coord_cache = NULL;
 196     }
 197
 198     if (!(view->converter == INVALID_CONV || view->converter != str_cnv_from_term)) {
 199         str_close_conv (view->converter);
 200         view->converter = str_cnv_from_term;
 201     }
 202
 203     mcview_hexedit_free_change_list (view);
 204 }
 205
 206 /* --------------------------------------------------------------------------------------------- */
 207
 208 void
 209 mcview_set_codeset (mcview_t * view)
 210 {
 211 #ifdef HAVE_CHARSET
 212     const char *cp_id = NULL;
 213
 214     view->utf8 = TRUE;
 215     cp_id = get_codepage_id (source_codepage >= 0 ? source_codepage : display_codepage);
 216     if (cp_id != NULL) {
 217         GIConv conv;
 218         conv = str_crt_conv_from (cp_id);
 219         if (conv != INVALID_CONV) {
 220             if (view->converter != str_cnv_from_term)
 221                 str_close_conv (view->converter);
 222             view->converter = conv;
 223         }
 224         view->utf8 = (gboolean) str_isutf8 (cp_id);
 225     }
 226 #else
 227     (void) view;
 228 #endif
 229 }
 230
 231 /* --------------------------------------------------------------------------------------------- */
 232
 233 void
 234 mcview_select_encoding (mcview_t * view)
 235 {
 236 #ifdef HAVE_CHARSET
 237     if (do_select_codepage ()) {
 238         mcview_set_codeset (view);
 239     }
 240 #else
 241     (void) view;
 242 #endif
 243 }
 244
 245 /* --------------------------------------------------------------------------------------------- */
 246
 247 void
 248 mcview_show_error (mcview_t * view, const char *msg)
 249 {
 250     mcview_close_datasource (view);
 251     if (mcview_is_in_panel (view)) {
 252         mcview_set_datasource_string (view, msg);
 253     } else {
 254         message (D_ERROR, MSG_ERROR, "%s", msg);
 255     }
 256 }
 257
 258 /* --------------------------------------------------------------------------------------------- */