lib/tty/win.c

   1 /*
   2    Terminal management xterm and rxvt support
   3
   4    Copyright (C) 1995-2016
   5    Free Software Foundation, Inc.
   6
   7    Written by:
   8    Andrew Borodin <aborodin@vmail.ru>, 2009.
   9
  10    This file is part of the Midnight Commander.
  11
  12    The Midnight Commander is free software: you can redistribute it
  13    and/or modify it under the terms of the GNU General Public License as
  14    published by the Free Software Foundation, either version 3 of the License,
  15    or (at your option) any later version.
  16
  17    The Midnight Commander is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24  */
  25
  26 /** \file win.c
  27  *  \brief Source: Terminal management xterm and rxvt support
  28  */
  29
  30 #include <config.h>
  31
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <sys/types.h>
  36 #include <unistd.h>
  37
  38 #include "lib/global.h"
  39 #include "lib/util.h"           /* is_printable() */
  40 #include "tty-internal.h"
  41 #include "tty.h"                /* tty_gotoyx, tty_print_char */
  42 #include "win.h"
  43
  44 /*** global variables ****************************************************************************/
  45
  46 char *smcup = NULL;
  47 char *rmcup = NULL;
  48
  49 /*** file scope macro definitions ****************************************************************/
  50
  51 /*** file scope type declarations ****************************************************************/
  52
  53 /*** file scope variables ************************************************************************/
  54
  55 static gboolean rxvt_extensions = FALSE;
  56
  57 /*** file scope functions ************************************************************************/
  58 /* --------------------------------------------------------------------------------------------- */
  59
  60 /* my own weird protocol base 16 - paul */
  61 static int
  62 rxvt_getc (void)
  63 {
  64     int r;
  65     unsigned char c;
  66
  67     while (read (0, &c, 1) != 1);
  68     if (c == '\n')
  69         return -1;
  70     r = (c - 'A') * 16;
  71     while (read (0, &c, 1) != 1);
  72     r += (c - 'A');
  73     return r;
  74 }
  75
  76 /* --------------------------------------------------------------------------------------------- */
  77
  78 static int
  79 anything_ready (void)
  80 {
  81     fd_set fds;
  82     struct timeval tv;
  83
  84     FD_ZERO (&fds);
  85     FD_SET (0, &fds);
  86     tv.tv_sec = 0;
  87     tv.tv_usec = 0;
  88     return select (1, &fds, 0, 0, &tv);
  89 }
  90
  91 /* --------------------------------------------------------------------------------------------- */
  92 /*** public functions ****************************************************************************/
  93 /* --------------------------------------------------------------------------------------------- */
  94
  95 void
  96 show_rxvt_contents (int starty, unsigned char y1, unsigned char y2)
  97 {
  98     unsigned char *k;
  99     int bytes, i, j, cols = 0;
 100
 101     y1 += (mc_global.keybar_visible != 0);      /* i don't knwo why we need this - paul */
 102     y2 += (mc_global.keybar_visible != 0);
 103     while (anything_ready ())
 104         tty_lowlevel_getch ();
 105
 106     /* my own weird protocol base 26 - paul */
 107     printf (ESC_STR "CL%c%c%c%c\n", (y1 / 26) + 'A', (y1 % 26) + 'A', (y2 / 26) + 'A',
 108             (y2 % 26) + 'A');
 109
 110     bytes = (y2 - y1) * (COLS + 1) + 1; /* *should* be the number of bytes read */
 111     j = 0;
 112     k = g_malloc (bytes);
 113     while (TRUE)
 114     {
 115         int c;
 116
 117         c = rxvt_getc ();
 118         if (c < 0)
 119             break;
 120         if (j < bytes)
 121             k[j++] = c;
 122         for (cols = 1;; cols++)
 123         {
 124             c = rxvt_getc ();
 125             if (c < 0)
 126                 break;
 127             if (j < bytes)
 128                 k[j++] = c;
 129         }
 130     }
 131     for (i = 0; i < j; i++)
 132     {
 133         if ((i % cols) == 0)
 134             tty_gotoyx (starty + (i / cols), 0);
 135         tty_print_char (is_printable (k[i]) ? k[i] : ' ');
 136     }
 137     g_free (k);
 138 }
 139
 140 /* --------------------------------------------------------------------------------------------- */
 141
 142 gboolean
 143 look_for_rxvt_extensions (void)
 144 {
 145     static gboolean been_called = FALSE;
 146
 147     if (!been_called)
 148     {
 149         const char *e = getenv ("RXVT_EXT");
 150         rxvt_extensions = ((e != NULL) && (strcmp (e, "1.0") == 0));
 151         been_called = TRUE;
 152     }
 153
 154     if (rxvt_extensions)
 155         mc_global.tty.console_flag = '\004';
 156
 157     return rxvt_extensions;
 158 }
 159
 160 /* --------------------------------------------------------------------------------------------- */