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, 2011
   7    The Free Software Foundation, Inc.
   8
   9    Written by:
  10    Miguel de Icaza, 1994, 1995, 1998
  11    Janne Kukonlehto, 1994, 1995
  12    Jakub Jelinek, 1995
  13    Joseph M. Hinkle, 1996
  14    Norbert Warmuth, 1997
  15    Pavel Machek, 1998
  16    Roland Illig <roland.illig@gmx.de>, 2004, 2005
  17    Slava Zanko <slavazanko@google.com>, 2009
  18    Andrew Borodin <aborodin@vmail.ru>, 2009, 2010
  19    Ilia Maslakov <il.smind@gmail.com>, 2009
  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 3 of the License,
  26    or (at your option) any later version.
  27
  28    The Midnight Commander is distributed in the hope that it will be useful,
  29    but WITHOUT ANY WARRANTY; without even the implied warranty of
  30    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  31    GNU 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, see <http://www.gnu.org/licenses/>.
  35  */
  36
  37 #include <config.h>
  38
  39 #include "lib/global.h"
  40 #include "lib/tty/tty.h"
  41 #include "lib/skin.h"
  42 #include "lib/util.h"           /* is_printable() */
  43 #ifdef HAVE_CHARSET
  44 #include "lib/charsets.h"
  45 #endif
  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 #ifdef HAVE_CHARSET
 174                 c = convert_to_display_c (c);
 175 #endif
 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 /* --------------------------------------------------------------------------------------------- */