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 "lib/global.h"
  38 #include "lib/strutil.h"
  39
  40 #include "tty.h"
  41 #include "tty-internal.h"
  42
  43
  44 /*** global variables **************************************************/
  45
  46 /* If true program softkeys (HP terminals only) on startup and after every
  47    command ran in the subshell to the description found in the termcap/terminfo
  48    database */
  49 int reset_hp_softkeys = 0;
  50
  51 /* If true lines are drown by spaces */
  52 gboolean slow_tty = FALSE;
  53
  54 /* If true use +, -, | for line drawing */
  55 gboolean ugly_line_drawing = FALSE;
  56
  57 int mc_tty_frm[MC_TTY_FRM_MAX];
  58
  59 /*** file scope macro definitions **************************************/
  60
  61 /*** file scope type declarations **************************************/
  62
  63 /*** file scope variables **********************************************/
  64
  65 static volatile sig_atomic_t got_interrupt = 0;
  66
  67 /*** file scope functions **********************************************/
  68
  69 static void
  70 sigintr_handler (int signo)
  71 {
  72     (void) &signo;
  73     got_interrupt = 1;
  74 }
  75
  76 /*** public functions **************************************************/
  77
  78 extern gboolean
  79 tty_is_slow (void)
  80 {
  81     return slow_tty;
  82 }
  83
  84 extern void
  85 tty_start_interrupt_key (void)
  86 {
  87     struct sigaction act;
  88
  89     act.sa_handler = sigintr_handler;
  90     sigemptyset (&act.sa_mask);
  91     act.sa_flags = SA_RESTART;
  92     sigaction (SIGINT, &act, NULL);
  93 }
  94
  95 extern void
  96 tty_enable_interrupt_key (void)
  97 {
  98     struct sigaction act;
  99
 100     act.sa_handler = sigintr_handler;
 101     sigemptyset (&act.sa_mask);
 102     act.sa_flags = 0;
 103     sigaction (SIGINT, &act, NULL);
 104     got_interrupt = 0;
 105 }
 106
 107 extern void
 108 tty_disable_interrupt_key (void)
 109 {
 110     struct sigaction act;
 111
 112     act.sa_handler = SIG_IGN;
 113     sigemptyset (&act.sa_mask);
 114     act.sa_flags = 0;
 115     sigaction (SIGINT, &act, NULL);
 116 }
 117
 118 extern gboolean
 119 tty_got_interrupt (void)
 120 {
 121     gboolean rv;
 122
 123     rv = (got_interrupt != 0);
 124     got_interrupt = 0;
 125     return rv;
 126 }
 127
 128 void
 129 tty_print_one_hline (gboolean single)
 130 {
 131     tty_print_alt_char (ACS_HLINE, single);
 132 }
 133
 134 void
 135 tty_print_one_vline (gboolean single)
 136 {
 137     tty_print_alt_char (ACS_VLINE, single);
 138 }
 139
 140 void
 141 tty_draw_box (int y, int x, int ys, int xs, gboolean single)
 142 {
 143     ys--;
 144     xs--;
 145
 146     tty_draw_vline (y, x, mc_tty_frm[single ? MC_TTY_FRM_VERT : MC_TTY_FRM_DVERT], ys);
 147     tty_draw_vline (y, x + xs, mc_tty_frm[single ? MC_TTY_FRM_VERT : MC_TTY_FRM_DVERT], ys);
 148     tty_draw_hline (y, x, mc_tty_frm[single ? MC_TTY_FRM_HORIZ : MC_TTY_FRM_DHORIZ], xs);
 149     tty_draw_hline (y + ys, x, mc_tty_frm[single ? MC_TTY_FRM_HORIZ : MC_TTY_FRM_DHORIZ], xs);
 150     tty_gotoyx (y, x);
 151     tty_print_alt_char (ACS_ULCORNER, single);
 152     tty_gotoyx (y + ys, x);
 153     tty_print_alt_char (ACS_LLCORNER, single);
 154     tty_gotoyx (y, x + xs);
 155     tty_print_alt_char (ACS_URCORNER, single);
 156     tty_gotoyx (y + ys, x + xs);
 157     tty_print_alt_char (ACS_LRCORNER, single);
 158 }
 159
 160 char *
 161 mc_tty_normalize_from_utf8 (const char *str)
 162 {
 163     GIConv conv;
 164     GString *buffer;
 165     const char *_system_codepage = str_detect_termencoding ();
 166
 167     if (str_isutf8 (_system_codepage))
 168         return g_strdup (str);
 169
 170     conv = g_iconv_open (_system_codepage, "UTF-8");
 171     if (conv == INVALID_CONV)
 172         return g_strdup (str);
 173
 174     buffer = g_string_new ("");
 175
 176     if (str_convert (conv, str, buffer) == ESTR_FAILURE)
 177     {
 178         g_string_free (buffer, TRUE);
 179         str_close_conv (conv);
 180         return g_strdup (str);
 181     }
 182     str_close_conv (conv);
 183
 184     return g_string_free (buffer, FALSE);
 185 }