root/lib/tty/win.c

/*   */

DEFINITIONS

1. rxvt_getc
2. anything_ready
3. show_rxvt_contents
4. look_for_rxvt_extensions

   1 /*
   2    Terminal management xterm and rxvt support
   3 
   4    Copyright (C) 1995-2025
   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 <https://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 #ifdef HAVE_SYS_SELECT_H
  36 #include <sys/select.h>
  37 #else
  38 #include <sys/time.h>
  39 #include <sys/types.h>
  40 #include <unistd.h>
  41 #endif
  42 
  43 #include "lib/global.h"
  44 #include "lib/util.h"  // is_printable()
  45 #include "tty-internal.h"
  46 #include "tty.h"  // tty_gotoyx, tty_print_char
  47 #include "win.h"
  48 
  49 /*** global variables ****************************************************************************/
  50 
  51 char *smcup = NULL;
  52 char *rmcup = NULL;
  53 
  54 /*** file scope macro definitions ****************************************************************/
  55 
  56 /*** file scope type declarations ****************************************************************/
  57 
  58 /*** forward declarations (file scope functions) *************************************************/
  59 
  60 /*** file scope variables ************************************************************************/
  61 
  62 static gboolean rxvt_extensions = FALSE;
  63 
  64 /* --------------------------------------------------------------------------------------------- */
  65 /*** file scope functions ************************************************************************/
  66 /* --------------------------------------------------------------------------------------------- */
  67 
  68 /* my own weird protocol base 16 - paul */
  69 static int
  70 rxvt_getc (void)
     /*   */
  71 {
  72     int r;
  73     unsigned char c;
  74 
  75     while (read (0, &c, 1) != 1)
  76         ;
  77     if (c == '\n')
  78         return -1;
  79     r = (c - 'A') * 16;
  80     while (read (0, &c, 1) != 1)
  81         ;
  82     r += (c - 'A');
  83     return r;
  84 }
  85 
  86 /* --------------------------------------------------------------------------------------------- */
  87 
  88 static int
  89 anything_ready (void)
     /*   */
  90 {
  91     fd_set fds;
  92     struct timeval tv;
  93 
  94     FD_ZERO (&fds);
  95     FD_SET (0, &fds);
  96     tv.tv_sec = 0;
  97     tv.tv_usec = 0;
  98     return select (1, &fds, 0, 0, &tv);
  99 }
 100 
 101 /* --------------------------------------------------------------------------------------------- */
 102 /*** public functions ****************************************************************************/
 103 /* --------------------------------------------------------------------------------------------- */
 104 
 105 void
 106 show_rxvt_contents (int starty, unsigned char y1, unsigned char y2)
     /*   */
 107 {
 108     unsigned char *k;
 109     int bytes, i, j, cols = 0;
 110 
 111     y1 += mc_global.keybar_visible != 0 ? 1 : 0;  // i don't know why we need this - paul
 112     y2 += mc_global.keybar_visible != 0 ? 1 : 0;
 113     while (anything_ready ())
 114         tty_lowlevel_getch ();
 115 
 116     // my own weird protocol base 26 - paul
 117     printf (ESC_STR "CL%c%c%c%c\n", (y1 / 26) + 'A', (y1 % 26) + 'A', (y2 / 26) + 'A',
 118             (y2 % 26) + 'A');
 119 
 120     bytes = (y2 - y1) * (COLS + 1) + 1;  // *should* be the number of bytes read
 121     j = 0;
 122     k = g_malloc (bytes);
 123     while (TRUE)
 124     {
 125         int c;
 126 
 127         c = rxvt_getc ();
 128         if (c < 0)
 129             break;
 130         if (j < bytes)
 131             k[j++] = c;
 132         for (cols = 1;; cols++)
 133         {
 134             c = rxvt_getc ();
 135             if (c < 0)
 136                 break;
 137             if (j < bytes)
 138                 k[j++] = c;
 139         }
 140     }
 141     for (i = 0; i < j; i++)
 142     {
 143         if ((i % cols) == 0)
 144             tty_gotoyx (starty + (i / cols), 0);
 145         tty_print_char (is_printable (k[i]) ? k[i] : ' ');
 146     }
 147     g_free (k);
 148 }
 149 
 150 /* --------------------------------------------------------------------------------------------- */
 151 
 152 gboolean
 153 look_for_rxvt_extensions (void)
     /*   */
 154 {
 155     static gboolean been_called = FALSE;
 156 
 157     if (!been_called)
 158     {
 159         const char *e = getenv ("RXVT_EXT");
 160         rxvt_extensions = ((e != NULL) && (strcmp (e, "1.0") == 0));
 161         been_called = TRUE;
 162     }
 163 
 164     if (rxvt_extensions)
 165         mc_global.tty.console_flag = '\004';
 166 
 167     return rxvt_extensions;
 168 }
 169 
 170 /* --------------------------------------------------------------------------------------------- */

/*   */