lib/tty/win.c

   1 /*
   2    Terminal management xterm and rxvt support
   3
   4    Copyright (C) 1995-2024
   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 #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     if (c == '\n')
  77         return -1;
  78     r = (c - 'A') * 16;
  79     while (read (0, &c, 1) != 1);
  80     r += (c - 'A');
  81     return r;
  82 }
  83
  84 /* --------------------------------------------------------------------------------------------- */
  85
  86 static int
  87 anything_ready (void)
  88 {
  89     fd_set fds;
  90     struct timeval tv;
  91
  92     FD_ZERO (&fds);
  93     FD_SET (0, &fds);
  94     tv.tv_sec = 0;
  95     tv.tv_usec = 0;
  96     return select (1, &fds, 0, 0, &tv);
  97 }
  98
  99 /* --------------------------------------------------------------------------------------------- */
 100 /*** public functions ****************************************************************************/
 101 /* --------------------------------------------------------------------------------------------- */
 102
 103 void
 104 show_rxvt_contents (int starty, unsigned char y1, unsigned char y2)
 105 {
 106     unsigned char *k;
 107     int bytes, i, j, cols = 0;
 108
 109     y1 += mc_global.keybar_visible != 0 ? 1 : 0;        /* i don't know why we need this - paul */
 110     y2 += mc_global.keybar_visible != 0 ? 1 : 0;
 111     while (anything_ready ())
 112         tty_lowlevel_getch ();
 113
 114     /* my own weird protocol base 26 - paul */
 115     printf (ESC_STR "CL%c%c%c%c\n", (y1 / 26) + 'A', (y1 % 26) + 'A', (y2 / 26) + 'A',
 116             (y2 % 26) + 'A');
 117
 118     bytes = (y2 - y1) * (COLS + 1) + 1; /* *should* be the number of bytes read */
 119     j = 0;
 120     k = g_malloc (bytes);
 121     while (TRUE)
 122     {
 123         int c;
 124
 125         c = rxvt_getc ();
 126         if (c < 0)
 127             break;
 128         if (j < bytes)
 129             k[j++] = c;
 130         for (cols = 1;; cols++)
 131         {
 132             c = rxvt_getc ();
 133             if (c < 0)
 134                 break;
 135             if (j < bytes)
 136                 k[j++] = c;
 137         }
 138     }
 139     for (i = 0; i < j; i++)
 140     {
 141         if ((i % cols) == 0)
 142             tty_gotoyx (starty + (i / cols), 0);
 143         tty_print_char (is_printable (k[i]) ? k[i] : ' ');
 144     }
 145     g_free (k);
 146 }
 147
 148 /* --------------------------------------------------------------------------------------------- */
 149
 150 gboolean
 151 look_for_rxvt_extensions (void)
 152 {
 153     static gboolean been_called = FALSE;
 154
 155     if (!been_called)
 156     {
 157         const char *e = getenv ("RXVT_EXT");
 158         rxvt_extensions = ((e != NULL) && (strcmp (e, "1.0") == 0));
 159         been_called = TRUE;
 160     }
 161
 162     if (rxvt_extensions)
 163         mc_global.tty.console_flag = '\004';
 164
 165     return rxvt_extensions;
 166 }
 167
 168 /* --------------------------------------------------------------------------------------------- */