src/viewer/plain.c

   1 /*
   2    Internal file viewer for the Midnight Commander
   3    Function for plain view
   4
   5    Copyright (C) 1994-2014
   6    Free Software Foundation, Inc.
   7
   8    Written by:
   9    Miguel de Icaza, 1994, 1995, 1998
  10    Janne Kukonlehto, 1994, 1995
  11    Jakub Jelinek, 1995
  12    Joseph M. Hinkle, 1996
  13    Norbert Warmuth, 1997
  14    Pavel Machek, 1998
  15    Roland Illig <roland.illig@gmx.de>, 2004, 2005
  16    Slava Zanko <slavazanko@google.com>, 2009
  17    Andrew Borodin <aborodin@vmail.ru>, 2009, 2010, 2013
  18    Ilia Maslakov <il.smind@gmail.com>, 2009
  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 3 of the License,
  25    or (at your option) any later version.
  26
  27    The Midnight Commander is distributed in the hope that it will be useful,
  28    but WITHOUT ANY WARRANTY; without even the implied warranty of
  29    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  30    GNU 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, see <http://www.gnu.org/licenses/>.
  34  */
  35
  36 #include <config.h>
  37
  38 #include "lib/global.h"
  39 #include "lib/tty/tty.h"
  40 #include "lib/skin.h"
  41 #include "lib/util.h"           /* is_printable() */
  42 #ifdef HAVE_CHARSET
  43 #include "lib/charsets.h"
  44 #endif
  45
  46 #include "src/setup.h"          /* option_tab_spacing */
  47
  48 #include "internal.h"
  49
  50 /*** global variables ****************************************************************************/
  51
  52 /*** file scope macro definitions ****************************************************************/
  53
  54 /*** file scope type declarations ****************************************************************/
  55
  56 /*** file scope variables ************************************************************************/
  57
  58 /*** file scope functions ************************************************************************/
  59 /* --------------------------------------------------------------------------------------------- */
  60
  61 /* --------------------------------------------------------------------------------------------- */
  62 /*** public functions ****************************************************************************/
  63 /* --------------------------------------------------------------------------------------------- */
  64
  65 void
  66 mcview_display_text (mcview_t * view)
  67 {
  68     const screen_dimen left = view->data_area.left;
  69     const screen_dimen top = view->data_area.top;
  70     const screen_dimen width = view->data_area.width;
  71     const screen_dimen height = view->data_area.height;
  72     screen_dimen row = 0, col = 0;
  73     off_t from;
  74     int cw = 1;
  75     int c, prev_ch = 0;
  76     gboolean last_row = TRUE;
  77     struct hexedit_change_node *curr = view->change_list;
  78
  79     mcview_display_clean (view);
  80     mcview_display_ruler (view);
  81
  82     /* Find the first displayable changed byte */
  83     from = view->dpy_start;
  84     while ((curr != NULL) && (curr->offset < from))
  85         curr = curr->next;
  86
  87     while (TRUE)
  88     {
  89         tty_setcolor (VIEW_NORMAL_COLOR);
  90
  91         if (row >= height)
  92             break;
  93
  94 #ifdef HAVE_CHARSET
  95         if (view->utf8)
  96         {
  97             gboolean read_res = TRUE;
  98
  99             c = mcview_get_utf (view, from, &cw, &read_res);
 100             if (!read_res)
 101                 break;
 102         }
 103         else
 104 #endif
 105         if (!mcview_get_byte (view, from, &c))
 106             break;
 107
 108         last_row = FALSE;
 109         from++;
 110         if (cw > 1)
 111             from += cw - 1;
 112
 113         if (c != '\n' && prev_ch == '\r')
 114         {
 115             if (++row >= height)
 116                 break;
 117
 118             col = 0;
 119             /* tty_print_anychar ('\n'); */
 120         }
 121
 122         prev_ch = c;
 123         if (c == '\r')
 124             continue;
 125
 126         if (c == '\n')
 127         {
 128             col = 0;
 129             row++;
 130             continue;
 131         }
 132
 133         if (col >= width && view->text_wrap_mode)
 134         {
 135             col = 0;
 136             if (++row >= height)
 137                 break;
 138         }
 139
 140         if (c == '\t')
 141         {
 142             col += (option_tab_spacing - col % option_tab_spacing);
 143             if (view->text_wrap_mode && col >= width && width != 0)
 144             {
 145                 row += col / width;
 146                 col %= width;
 147             }
 148             continue;
 149         }
 150
 151         if (view->search_start <= from && from < view->search_end)
 152             tty_setcolor (SELECTED_COLOR);
 153
 154         if (((off_t) col >= view->dpy_text_column)
 155             && ((off_t) col - view->dpy_text_column < (off_t) width))
 156         {
 157             widget_move (view, top + row, left + ((off_t) col - view->dpy_text_column));
 158 #ifdef HAVE_CHARSET
 159             if (mc_global.utf8_display)
 160             {
 161                 if (!view->utf8)
 162                     c = convert_from_8bit_to_utf_c ((unsigned char) c, view->converter);
 163                 if (!g_unichar_isprint (c))
 164                     c = '.';
 165             }
 166             else if (view->utf8)
 167                 c = convert_from_utf_to_current_c (c, view->converter);
 168             else
 169 #endif
 170             {
 171 #ifdef HAVE_CHARSET
 172                 c = convert_to_display_c (c);
 173 #endif
 174                 if (!is_printable (c))
 175                     c = '.';
 176             }
 177
 178             tty_print_anychar (c);
 179         }
 180
 181         col++;
 182
 183 #ifdef HAVE_CHARSET
 184         if (view->utf8)
 185         {
 186             if (g_unichar_iswide (c))
 187                 col++;
 188             else if (g_unichar_iszerowidth (c))
 189                 col--;
 190         }
 191 #endif
 192     }
 193
 194     view->dpy_end = from;
 195     if (mcview_show_eof != NULL && mcview_show_eof[0] != '\0')
 196     {
 197         if (last_row && mcview_get_byte (view, from - 1, &c))
 198             if (c != '\n')
 199                 row--;
 200         while (++row < height)
 201         {
 202             widget_move (view, top + row, left);
 203             tty_print_string (mcview_show_eof);
 204         }
 205     }
 206 }
 207
 208 /* --------------------------------------------------------------------------------------------- */