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/main.h"           /* utf8_display */
  48 #include "src/setup.h"          /* option_tab_spacing */
  49
  50 #include "internal.h"
  51 #include "mcviewer.h"           /* mcview_show_eof */
  52
  53 /*** global variables ****************************************************************************/
  54
  55 /*** file scope macro definitions ****************************************************************/
  56
  57 /*** file scope type declarations ****************************************************************/
  58
  59 /*** file scope variables ************************************************************************/
  60
  61 /*** file scope functions ************************************************************************/
  62 /* --------------------------------------------------------------------------------------------- */
  63
  64 /* --------------------------------------------------------------------------------------------- */
  65 /*** public functions ****************************************************************************/
  66 /* --------------------------------------------------------------------------------------------- */
  67
  68 void
  69 mcview_display_text (mcview_t * view)
  70 {
  71     const screen_dimen left = view->data_area.left;
  72     const screen_dimen top = view->data_area.top;
  73     const screen_dimen width = view->data_area.width;
  74     const screen_dimen height = view->data_area.height;
  75     screen_dimen row = 0, col = 0;
  76     off_t from;
  77     int cw = 1;
  78     int c, prev_ch = 0;
  79     gboolean last_row = TRUE;
  80     struct hexedit_change_node *curr = view->change_list;
  81
  82     mcview_display_clean (view);
  83     mcview_display_ruler (view);
  84
  85     /* Find the first displayable changed byte */
  86     from = view->dpy_start;
  87     while ((curr != NULL) && (curr->offset < from))
  88         curr = curr->next;
  89
  90     while (TRUE)
  91     {
  92         tty_setcolor (NORMAL_COLOR);
  93
  94         if (row >= height)
  95             break;
  96
  97 #ifdef HAVE_CHARSET
  98         if (view->utf8)
  99         {
 100             gboolean read_res = TRUE;
 101
 102             c = mcview_get_utf (view, from, &cw, &read_res);
 103             if (!read_res)
 104                 break;
 105         }
 106         else
 107 #endif
 108         if (!mcview_get_byte (view, from, &c))
 109             break;
 110
 111         last_row = FALSE;
 112         from++;
 113         if (cw > 1)
 114             from += cw - 1;
 115
 116         if (c != '\n' && prev_ch == '\r')
 117         {
 118             if (++row >= height)
 119                 break;
 120
 121             col = 0;
 122             /* tty_print_anychar ('\n'); */
 123         }
 124
 125         prev_ch = c;
 126         if (c == '\r')
 127             continue;
 128
 129         if (c == '\n')
 130         {
 131             col = 0;
 132             row++;
 133             continue;
 134         }
 135
 136         if (col >= width && view->text_wrap_mode)
 137         {
 138             col = 0;
 139             if (++row >= height)
 140                 break;
 141         }
 142
 143         if (c == '\t')
 144         {
 145             col += (option_tab_spacing - col % option_tab_spacing);
 146             if (view->text_wrap_mode && col >= width && width != 0)
 147             {
 148                 row += col / width;
 149                 col %= width;
 150             }
 151             continue;
 152         }
 153
 154         if (view->search_start <= from && from < view->search_end)
 155             tty_setcolor (SELECTED_COLOR);
 156
 157         if (((off_t) col >= view->dpy_text_column)
 158             && ((off_t) col - view->dpy_text_column < (off_t) width))
 159         {
 160             widget_move (view, top + row, left + ((off_t) col - view->dpy_text_column));
 161 #ifdef HAVE_CHARSET
 162             if (utf8_display)
 163             {
 164                 if (!view->utf8)
 165                     c = convert_from_8bit_to_utf_c ((unsigned char) c, view->converter);
 166                 if (!g_unichar_isprint (c))
 167                     c = '.';
 168             }
 169             else if (view->utf8)
 170                 c = convert_from_utf_to_current_c (c, view->converter);
 171             else
 172 #endif
 173             {
 174                 c = convert_to_display_c (c);
 175
 176                 if (!is_printable (c))
 177                     c = '.';
 178             }
 179
 180             tty_print_anychar (c);
 181         }
 182
 183         col++;
 184
 185 #ifdef HAVE_CHARSET
 186         if (view->utf8)
 187         {
 188             if (g_unichar_iswide (c))
 189                 col++;
 190             else if (g_unichar_iszerowidth (c))
 191                 col--;
 192         }
 193 #endif
 194     }
 195
 196     view->dpy_end = from;
 197     if (mcview_show_eof != NULL && mcview_show_eof[0] != '\0')
 198     {
 199         if (last_row && mcview_get_byte (view, from - 1, &c))
 200             if (c != '\n')
 201                 row--;
 202         while (++row < height)
 203         {
 204             widget_move (view, top + row, left);
 205             tty_print_string (mcview_show_eof);
 206         }
 207     }
 208 }
 209
 210 /* --------------------------------------------------------------------------------------------- */