src/viewer/plain.c

   1 /*
   2    Internal file viewer for the Midnight Commander
   3    Function for plain view
   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    2010 Andrew Borodin <aborodin@vmail.ru>
  20
  21    This file is part of the Midnight Commander.
  22
  23    The Midnight Commander is free software; you can redistribute it
  24    and/or modify it under the terms of the GNU General Public License as
  25    published by the Free Software Foundation; either version 2 of the
  26    License, or (at your option) any later version.
  27
  28    The Midnight Commander is distributed in the hope that it will be
  29    useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  30    of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  31    General Public License for more details.
  32
  33    You should have received a copy of the GNU General Public License
  34    along with this program; if not, write to the Free Software
  35    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  36    MA 02110-1301, USA.
  37  */
  38
  39 #include <config.h>
  40
  41 #include "lib/global.h"
  42 #include "lib/tty/tty.h"
  43 #include "lib/skin.h"
  44 #include "lib/util.h"           /* is_printable() */
  45 #include "lib/charsets.h"
  46
  47 #include "src/setup.h"          /* option_tab_spacing */
  48
  49 #include "internal.h"
  50 #include "mcviewer.h"           /* mcview_show_eof */
  51
  52 /*** global variables ****************************************************************************/
  53
  54 /*** file scope macro definitions ****************************************************************/
  55
  56 /*** file scope type declarations ****************************************************************/
  57
  58 /*** file scope variables ************************************************************************/
  59
  60 /*** file scope functions ************************************************************************/
  61 /* --------------------------------------------------------------------------------------------- */
  62
  63 /* --------------------------------------------------------------------------------------------- */
  64 /*** public functions ****************************************************************************/
  65 /* --------------------------------------------------------------------------------------------- */
  66
  67 void
  68 mcview_display_text (mcview_t * view)
  69 {
  70     const screen_dimen left = view->data_area.left;
  71     const screen_dimen top = view->data_area.top;
  72     const screen_dimen width = view->data_area.width;
  73     const screen_dimen height = view->data_area.height;
  74     screen_dimen row = 0, col = 0;
  75     off_t from;
  76     int cw = 1;
  77     int c, prev_ch = 0;
  78     gboolean last_row = TRUE;
  79     struct hexedit_change_node *curr = view->change_list;
  80
  81     mcview_display_clean (view);
  82     mcview_display_ruler (view);
  83
  84     /* Find the first displayable changed byte */
  85     from = view->dpy_start;
  86     while ((curr != NULL) && (curr->offset < from))
  87         curr = curr->next;
  88
  89     while (TRUE)
  90     {
  91         tty_setcolor (NORMAL_COLOR);
  92
  93         if (row >= height)
  94             break;
  95
  96 #ifdef HAVE_CHARSET
  97         if (view->utf8)
  98         {
  99             gboolean read_res = TRUE;
 100
 101             c = mcview_get_utf (view, from, &cw, &read_res);
 102             if (!read_res)
 103                 break;
 104         }
 105         else
 106 #endif
 107         if (!mcview_get_byte (view, from, &c))
 108             break;
 109
 110         last_row = FALSE;
 111         from++;
 112         if (cw > 1)
 113             from += cw - 1;
 114
 115         if (c != '\n' && prev_ch == '\r')
 116         {
 117             if (++row >= height)
 118                 break;
 119
 120             col = 0;
 121             /* tty_print_anychar ('\n'); */
 122         }
 123
 124         prev_ch = c;
 125         if (c == '\r')
 126             continue;
 127
 128         if (c == '\n')
 129         {
 130             col = 0;
 131             row++;
 132             continue;
 133         }
 134
 135         if (col >= width && view->text_wrap_mode)
 136         {
 137             col = 0;
 138             if (++row >= height)
 139                 break;
 140         }
 141
 142         if (c == '\t')
 143         {
 144             col += (option_tab_spacing - col % option_tab_spacing);
 145             if (view->text_wrap_mode && col >= width && width != 0)
 146             {
 147                 row += col / width;
 148                 col %= width;
 149             }
 150             continue;
 151         }
 152
 153         if (view->search_start <= from && from < view->search_end)
 154             tty_setcolor (SELECTED_COLOR);
 155
 156         if (((off_t) col >= view->dpy_text_column)
 157             && ((off_t) col - view->dpy_text_column < (off_t) width))
 158         {
 159             widget_move (view, top + row, left + ((off_t) col - view->dpy_text_column));
 160 #ifdef HAVE_CHARSET
 161             if (mc_global.utf8_display)
 162             {
 163                 if (!view->utf8)
 164                     c = convert_from_8bit_to_utf_c ((unsigned char) c, view->converter);
 165                 if (!g_unichar_isprint (c))
 166                     c = '.';
 167             }
 168             else if (view->utf8)
 169                 c = convert_from_utf_to_current_c (c, view->converter);
 170             else
 171 #endif
 172             {
 173                 c = convert_to_display_c (c);
 174
 175                 if (!is_printable (c))
 176                     c = '.';
 177             }
 178
 179             tty_print_anychar (c);
 180         }
 181
 182         col++;
 183
 184 #ifdef HAVE_CHARSET
 185         if (view->utf8)
 186         {
 187             if (g_unichar_iswide (c))
 188                 col++;
 189             else if (g_unichar_iszerowidth (c))
 190                 col--;
 191         }
 192 #endif
 193     }
 194
 195     view->dpy_end = from;
 196     if (mcview_show_eof != NULL && mcview_show_eof[0] != '\0')
 197     {
 198         if (last_row && mcview_get_byte (view, from - 1, &c))
 199             if (c != '\n')
 200                 row--;
 201         while (++row < height)
 202         {
 203             widget_move (view, top + row, left);
 204             tty_print_string (mcview_show_eof);
 205         }
 206     }
 207 }
 208
 209 /* --------------------------------------------------------------------------------------------- */