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
  70 static void
  71 sigintr_handler (int signo)
  72 {
  73     (void) &signo;
  74     got_interrupt = 1;
  75 }
  76
  77 /* --------------------------------------------------------------------------------------------- */
  78 /*** public functions ****************************************************************************/
  79 /* --------------------------------------------------------------------------------------------- */
  80
  81 extern gboolean
  82 tty_is_slow (void)
  83 {
  84     return slow_tty;
  85 }
  86
  87 /* --------------------------------------------------------------------------------------------- */
  88
  89 extern void
  90 tty_start_interrupt_key (void)
  91 {
  92     struct sigaction act;
  93
  94     act.sa_handler = sigintr_handler;
  95     sigemptyset (&act.sa_mask);
  96     act.sa_flags = SA_RESTART;
  97     sigaction (SIGINT, &act, NULL);
  98 }
  99
 100 /* --------------------------------------------------------------------------------------------- */
 101
 102 extern void
 103 tty_enable_interrupt_key (void)
 104 {
 105     struct sigaction act;
 106
 107     act.sa_handler = sigintr_handler;
 108     sigemptyset (&act.sa_mask);
 109     act.sa_flags = 0;
 110     sigaction (SIGINT, &act, NULL);
 111     got_interrupt = 0;
 112 }
 113
 114 /* --------------------------------------------------------------------------------------------- */
 115
 116 extern void
 117 tty_disable_interrupt_key (void)
 118 {
 119     struct sigaction act;
 120
 121     act.sa_handler = SIG_IGN;
 122     sigemptyset (&act.sa_mask);
 123     act.sa_flags = 0;
 124     sigaction (SIGINT, &act, NULL);
 125 }
 126
 127 /* --------------------------------------------------------------------------------------------- */
 128
 129 extern gboolean
 130 tty_got_interrupt (void)
 131 {
 132     gboolean rv;
 133
 134     rv = (got_interrupt != 0);
 135     got_interrupt = 0;
 136     return rv;
 137 }
 138
 139 /* --------------------------------------------------------------------------------------------- */
 140
 141 void
 142 tty_print_one_hline (gboolean single)
 143 {
 144     tty_print_alt_char (ACS_HLINE, single);
 145 }
 146
 147 /* --------------------------------------------------------------------------------------------- */
 148
 149 void
 150 tty_print_one_vline (gboolean single)
 151 {
 152     tty_print_alt_char (ACS_VLINE, single);
 153 }
 154
 155 /* --------------------------------------------------------------------------------------------- */
 156
 157 void
 158 tty_draw_box (int y, int x, int ys, int xs, gboolean single)
 159 {
 160     ys--;
 161     xs--;
 162
 163     tty_draw_vline (y, x, mc_tty_frm[single ? MC_TTY_FRM_VERT : MC_TTY_FRM_DVERT], ys);
 164     tty_draw_vline (y, x + xs, mc_tty_frm[single ? MC_TTY_FRM_VERT : MC_TTY_FRM_DVERT], ys);
 165     tty_draw_hline (y, x, mc_tty_frm[single ? MC_TTY_FRM_HORIZ : MC_TTY_FRM_DHORIZ], xs);
 166     tty_draw_hline (y + ys, x, mc_tty_frm[single ? MC_TTY_FRM_HORIZ : MC_TTY_FRM_DHORIZ], xs);
 167     tty_gotoyx (y, x);
 168     tty_print_alt_char (ACS_ULCORNER, single);
 169     tty_gotoyx (y + ys, x);
 170     tty_print_alt_char (ACS_LLCORNER, single);
 171     tty_gotoyx (y, x + xs);
 172     tty_print_alt_char (ACS_URCORNER, single);
 173     tty_gotoyx (y + ys, x + xs);
 174     tty_print_alt_char (ACS_LRCORNER, single);
 175 }
 176
 177 /* --------------------------------------------------------------------------------------------- */
 178
 179 char *
 180 mc_tty_normalize_from_utf8 (const char *str)
 181 {
 182     GIConv conv;
 183     GString *buffer;
 184     const char *_system_codepage = str_detect_termencoding ();
 185
 186     if (str_isutf8 (_system_codepage))
 187         return g_strdup (str);
 188
 189     conv = g_iconv_open (_system_codepage, "UTF-8");
 190     if (conv == INVALID_CONV)
 191         return g_strdup (str);
 192
 193     buffer = g_string_new ("");
 194
 195     if (str_convert (conv, str, buffer) == ESTR_FAILURE)
 196     {
 197         g_string_free (buffer, TRUE);
 198         str_close_conv (conv);
 199         return g_strdup (str);
 200     }
 201     str_close_conv (conv);
 202
 203     return g_string_free (buffer, FALSE);
 204 }
 205
 206 /* --------------------------------------------------------------------------------------------- */