lib/tty/tty.c

   1 /*
   2    Interface to the terminal controlling library.
   3
   4    Copyright (C) 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
   5
   6    Written by:
   7    Roland Illig <roland.illig@gmx.de>, 2005.
   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 2 of the
  15    License, or (at your option) any later version.
  16
  17    The Midnight Commander is distributed in the hope that it will be
  18    useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  19    of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20    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, write to the Free Software
  24    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  25    MA 02110-1301, USA.
  26  */
  27
  28 /** \file tty.c
  29  *  \brief Source: %interface to the terminal controlling library
  30  */
  31
  32 #include <config.h>
  33
  34 #include <signal.h>
  35 #include <stdarg.h>
  36
  37 #include "../../src/global.h"
  38
  39 #include "../../src/tty/tty.h"
  40 #include "../../src/tty/tty-internal.h"
  41
  42 #include "../../src/strutil.h"
  43
  44 /*** global variables **************************************************/
  45
  46 /* If true lines are drown by spaces */
  47 gboolean slow_tty = FALSE;
  48
  49 /* If true use +, -, | for line drawing */
  50 gboolean ugly_line_drawing = FALSE;
  51
  52 int mc_tty_ugly_frm[MC_TTY_FRM_MAX];
  53
  54 /*** file scope macro definitions **************************************/
  55
  56 /*** file scope type declarations **************************************/
  57
  58 /*** file scope variables **********************************************/
  59
  60 static volatile sig_atomic_t got_interrupt = 0;
  61
  62 /*** file scope functions **********************************************/
  63
  64 static void
  65 sigintr_handler (int signo)
  66 {
  67     (void) &signo;
  68     got_interrupt = 1;
  69 }
  70
  71 /*** public functions **************************************************/
  72
  73 extern gboolean
  74 tty_is_slow (void)
  75 {
  76     return slow_tty;
  77 }
  78
  79 extern void
  80 tty_start_interrupt_key (void)
  81 {
  82     struct sigaction act;
  83
  84     act.sa_handler = sigintr_handler;
  85     sigemptyset (&act.sa_mask);
  86     act.sa_flags = SA_RESTART;
  87     sigaction (SIGINT, &act, NULL);
  88 }
  89
  90 extern void
  91 tty_enable_interrupt_key (void)
  92 {
  93     struct sigaction act;
  94
  95     act.sa_handler = sigintr_handler;
  96     sigemptyset (&act.sa_mask);
  97     act.sa_flags = 0;
  98     sigaction (SIGINT, &act, NULL);
  99     got_interrupt = 0;
 100 }
 101
 102 extern void
 103 tty_disable_interrupt_key (void)
 104 {
 105     struct sigaction act;
 106
 107     act.sa_handler = SIG_IGN;
 108     sigemptyset (&act.sa_mask);
 109     act.sa_flags = 0;
 110     sigaction (SIGINT, &act, NULL);
 111 }
 112
 113 extern gboolean
 114 tty_got_interrupt (void)
 115 {
 116     gboolean rv;
 117
 118     rv = (got_interrupt != 0);
 119     got_interrupt = 0;
 120     return rv;
 121 }
 122
 123 void
 124 tty_print_one_hline (void)
 125 {
 126     tty_print_alt_char (mc_tty_ugly_frm[MC_TTY_FRM_thinhoriz]);
 127 }
 128
 129 void
 130 tty_print_one_vline (void)
 131 {
 132     tty_print_alt_char (mc_tty_ugly_frm[MC_TTY_FRM_thinvert]);
 133 }
 134
 135 void
 136 tty_draw_box (int y, int x, int ys, int xs)
 137 {
 138     tty_draw_vline (y, x, mc_tty_ugly_frm[MC_TTY_FRM_vert], ys);
 139     tty_draw_vline (y, x + xs - 1, mc_tty_ugly_frm[MC_TTY_FRM_vert], ys);
 140     tty_draw_hline (y, x, mc_tty_ugly_frm[MC_TTY_FRM_horiz], xs);
 141     tty_draw_hline (y + ys - 1, x, mc_tty_ugly_frm[MC_TTY_FRM_horiz], xs);
 142     tty_gotoyx (y, x);
 143     tty_print_alt_char (mc_tty_ugly_frm[MC_TTY_FRM_lefttop]);
 144     tty_gotoyx (y + ys - 1, x);
 145     tty_print_alt_char (mc_tty_ugly_frm[MC_TTY_FRM_leftbottom]);
 146     tty_gotoyx (y, x + xs - 1);
 147     tty_print_alt_char (mc_tty_ugly_frm[MC_TTY_FRM_righttop]);
 148     tty_gotoyx (y + ys - 1, x + xs - 1);
 149     tty_print_alt_char (mc_tty_ugly_frm[MC_TTY_FRM_rightbottom]);
 150 }
 151
 152 char *
 153 mc_tty_normalize_from_utf8 (const char *str)
 154 {
 155     GIConv conv;
 156     GString *buffer;
 157     const char *_system_codepage = str_detect_termencoding ();
 158
 159     if (str_isutf8 (_system_codepage))
 160         return g_strdup (str);
 161
 162     conv = g_iconv_open (_system_codepage, "UTF-8");
 163     if (conv == INVALID_CONV)
 164         return g_strdup (str);
 165
 166     buffer = g_string_new ("");
 167
 168     if (str_convert (conv, str, buffer) == ESTR_FAILURE) {
 169         g_string_free (buffer, TRUE);
 170         str_close_conv (conv);
 171         return g_strdup (str);
 172     }
 173     str_close_conv (conv);
 174
 175     return g_string_free (buffer, FALSE);
 176 }