Adding upstream version 3:4.8.29.upstream/3%4.8.29upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 413 insertions, 0 deletions

diff --git a/lib/tty/tty.c b/lib/tty/tty.c
new file mode 100644
index 0000000..60b138e
--- /dev/null
+++ b/lib/tty/tty.c
@@ -0,0 +1,413 @@
+/*
+   Interface to the terminal controlling library.
+
+   Copyright (C) 2005-2022
+   Free Software Foundation, Inc.
+
+   Written by:
+   Roland Illig <roland.illig@gmx.de>, 2005.
+   Andrew Borodin <aborodin@vmail.ru>, 2009.
+
+   This file is part of the Midnight Commander.
+
+   The Midnight Commander is free software: you can redistribute it
+   and/or modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation, either version 3 of the License,
+   or (at your option) any later version.
+
+   The Midnight Commander is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** \file tty.c
+ *  \brief Source: %interface to the terminal controlling library
+ */
+
+#include <config.h>
+
+#include <errno.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>             /* memset() */
+
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#else
+#include <sys/time.h>
+#include <sys/types.h>
+#endif
+#include <unistd.h>             /* exit() */
+
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+
+/* In some systems (like Solaris 11.4 SPARC), TIOCSWINSZ is defined in termios.h */
+#include <termios.h>
+
+#include "lib/global.h"
+#include "lib/strutil.h"
+
+#include "tty.h"
+#include "tty-internal.h"
+#include "color.h"              /* tty_set_normal_attrs() */
+#include "mouse.h"              /* use_mouse_p */
+#include "win.h"
+
+/*** global variables ****************************************************************************/
+
+int mc_tty_frm[MC_TTY_FRM_MAX];
+
+/*** file scope macro definitions ****************************************************************/
+
+/*** file scope type declarations ****************************************************************/
+
+/*** file scope variables ************************************************************************/
+
+static SIG_ATOMIC_VOLATILE_T got_interrupt = 0;
+
+/*** file scope functions ************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+sigintr_handler (int signo)
+{
+    (void) &signo;
+    got_interrupt = 1;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/*** public functions ****************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Check terminal type. If $TERM is not set or value is empty, mc finishes with EXIT_FAILURE.
+ *
+ * @param force_xterm Set forced the XTerm type
+ *
+ * @return true if @param force_xterm is true or value of $TERM is one of following:
+ *         term*
+ *         konsole*
+ *         rxvt*
+ *         Eterm
+ *         dtterm
+ *         alacritty*
+ *         foot*
+ *         screen*
+ *         tmux*
+ *         contour*
+ */
+gboolean
+tty_check_term (gboolean force_xterm)
+{
+    const char *termvalue;
+
+    termvalue = getenv ("TERM");
+    if (termvalue == NULL || *termvalue == '\0')
+    {
+        fputs (_("The TERM environment variable is unset!\n"), stderr);
+        exit (EXIT_FAILURE);
+    }
+
+    /* *INDENT-OFF* */
+    return force_xterm
+        || strncmp (termvalue, "xterm", 5) == 0
+        || strncmp (termvalue, "konsole", 7) == 0
+        || strncmp (termvalue, "rxvt", 4) == 0
+        || strcmp (termvalue, "Eterm") == 0
+        || strcmp (termvalue, "dtterm") == 0
+        || strncmp (termvalue, "alacritty", 9) == 0
+        || strncmp (termvalue, "foot", 4) == 0
+        || strncmp (termvalue, "screen", 6) == 0
+        || strncmp (termvalue, "tmux", 4) == 0
+        || strncmp (termvalue, "contour", 7) == 0;
+    /* *INDENT-ON* */
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+extern void
+tty_start_interrupt_key (void)
+{
+    struct sigaction act;
+
+    memset (&act, 0, sizeof (act));
+    act.sa_handler = sigintr_handler;
+    sigemptyset (&act.sa_mask);
+#ifdef SA_RESTART
+    act.sa_flags = SA_RESTART;
+#endif /* SA_RESTART */
+    sigaction (SIGINT, &act, NULL);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+extern void
+tty_enable_interrupt_key (void)
+{
+    struct sigaction act;
+
+    memset (&act, 0, sizeof (act));
+    act.sa_handler = sigintr_handler;
+    sigemptyset (&act.sa_mask);
+    sigaction (SIGINT, &act, NULL);
+    got_interrupt = 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+extern void
+tty_disable_interrupt_key (void)
+{
+    struct sigaction act;
+
+    memset (&act, 0, sizeof (act));
+    act.sa_handler = SIG_IGN;
+    sigemptyset (&act.sa_mask);
+    sigaction (SIGINT, &act, NULL);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+extern gboolean
+tty_got_interrupt (void)
+{
+    gboolean rv;
+
+    rv = (got_interrupt != 0);
+    got_interrupt = 0;
+    return rv;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+gboolean
+tty_got_winch (void)
+{
+    fd_set fdset;
+    /* *INDENT-OFF* */
+    /* instant timeout */
+    struct timeval timeout = { .tv_sec = 0, .tv_usec = 0 };
+    /* *INDENT-ON* */
+    int ok;
+
+    FD_ZERO (&fdset);
+    FD_SET (sigwinch_pipe[0], &fdset);
+
+    while ((ok = select (sigwinch_pipe[0] + 1, &fdset, NULL, NULL, &timeout)) < 0)
+        if (errno != EINTR)
+        {
+            perror (_("Cannot check SIGWINCH pipe"));
+            exit (EXIT_FAILURE);
+        }
+
+    return (ok != 0 && FD_ISSET (sigwinch_pipe[0], &fdset));
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+tty_flush_winch (void)
+{
+    ssize_t n;
+
+    /* merge all SIGWINCH events raised to this moment */
+    do
+    {
+        char x[16];
+
+        /* read multiple events at a time  */
+        n = read (sigwinch_pipe[0], &x, sizeof (x));
+    }
+    while (n > 0 || (n == -1 && errno == EINTR));
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+tty_print_one_hline (gboolean single)
+{
+    tty_print_alt_char (ACS_HLINE, single);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+tty_print_one_vline (gboolean single)
+{
+    tty_print_alt_char (ACS_VLINE, single);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+tty_draw_box (int y, int x, int ys, int xs, gboolean single)
+{
+    int y2, x2;
+
+    if (ys <= 0 || xs <= 0)
+        return;
+
+    ys--;
+    xs--;
+
+    y2 = y + ys;
+    x2 = x + xs;
+
+    tty_draw_vline (y, x, mc_tty_frm[single ? MC_TTY_FRM_VERT : MC_TTY_FRM_DVERT], ys);
+    tty_draw_vline (y, x2, mc_tty_frm[single ? MC_TTY_FRM_VERT : MC_TTY_FRM_DVERT], ys);
+    tty_draw_hline (y, x, mc_tty_frm[single ? MC_TTY_FRM_HORIZ : MC_TTY_FRM_DHORIZ], xs);
+    tty_draw_hline (y2, x, mc_tty_frm[single ? MC_TTY_FRM_HORIZ : MC_TTY_FRM_DHORIZ], xs);
+    tty_gotoyx (y, x);
+    tty_print_alt_char (ACS_ULCORNER, single);
+    tty_gotoyx (y2, x);
+    tty_print_alt_char (ACS_LLCORNER, single);
+    tty_gotoyx (y, x2);
+    tty_print_alt_char (ACS_URCORNER, single);
+    tty_gotoyx (y2, x2);
+    tty_print_alt_char (ACS_LRCORNER, single);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+tty_draw_box_shadow (int y, int x, int rows, int cols, int shadow_color)
+{
+    /* draw right shadow */
+    tty_colorize_area (y + 1, x + cols, rows - 1, 2, shadow_color);
+    /* draw bottom shadow */
+    tty_colorize_area (y + rows, x + 2, 1, cols, shadow_color);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+char *
+mc_tty_normalize_from_utf8 (const char *str)
+{
+    GIConv conv;
+    GString *buffer;
+    const char *_system_codepage = str_detect_termencoding ();
+
+    if (str_isutf8 (_system_codepage))
+        return g_strdup (str);
+
+    conv = g_iconv_open (_system_codepage, "UTF-8");
+    if (conv == INVALID_CONV)
+        return g_strdup (str);
+
+    buffer = g_string_new ("");
+
+    if (str_convert (conv, str, buffer) == ESTR_FAILURE)
+    {
+        g_string_free (buffer, TRUE);
+        str_close_conv (conv);
+        return g_strdup (str);
+    }
+    str_close_conv (conv);
+
+    return g_string_free (buffer, FALSE);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/** Resize given terminal using TIOCSWINSZ, return ioctl() result */
+int
+tty_resize (int fd)
+{
+#if defined TIOCSWINSZ
+    struct winsize tty_size;
+
+    tty_size.ws_row = LINES;
+    tty_size.ws_col = COLS;
+    tty_size.ws_xpixel = tty_size.ws_ypixel = 0;
+
+    return ioctl (fd, TIOCSWINSZ, &tty_size);
+#else
+    return 0;
+#endif
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/** Clear screen */
+void
+tty_clear_screen (void)
+{
+    tty_set_normal_attrs ();
+    tty_fill_region (0, 0, LINES, COLS, ' ');
+    tty_refresh ();
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+tty_init_xterm_support (gboolean is_xterm)
+{
+    const char *termvalue;
+
+    termvalue = getenv ("TERM");
+
+    /* Check mouse and ca capabilities */
+    /* terminfo/termcap structures have been already initialized,
+       in slang_init() or/and init_curses()  */
+    /* Check terminfo at first, then check termcap */
+    xmouse_seq = tty_tgetstr ("kmous");
+    if (xmouse_seq == NULL)
+        xmouse_seq = tty_tgetstr ("Km");
+    smcup = tty_tgetstr ("smcup");
+    if (smcup == NULL)
+        smcup = tty_tgetstr ("ti");
+    rmcup = tty_tgetstr ("rmcup");
+    if (rmcup == NULL)
+        rmcup = tty_tgetstr ("te");
+
+    if (strcmp (termvalue, "cygwin") == 0)
+    {
+        is_xterm = TRUE;
+        use_mouse_p = MOUSE_DISABLED;
+    }
+
+    if (is_xterm)
+    {
+        /* Default to the standard xterm sequence */
+        if (xmouse_seq == NULL)
+            xmouse_seq = ESC_STR "[M";
+
+        /* Enable mouse unless explicitly disabled by --nomouse */
+        if (use_mouse_p != MOUSE_DISABLED)
+        {
+            if (mc_global.tty.old_mouse)
+                use_mouse_p = MOUSE_XTERM_NORMAL_TRACKING;
+            else
+            {
+                /* FIXME: this dirty hack to set supported type of tracking the mouse */
+                const char *color_term = getenv ("COLORTERM");
+                if (strncmp (termvalue, "rxvt", 4) == 0 ||
+                    (color_term != NULL && strncmp (color_term, "rxvt", 4) == 0) ||
+                    strcmp (termvalue, "Eterm") == 0)
+                    use_mouse_p = MOUSE_XTERM_NORMAL_TRACKING;
+                else
+                    use_mouse_p = MOUSE_XTERM_BUTTON_EVENT_TRACKING;
+            }
+        }
+    }
+
+    /* There's only one termcap entry "kmous", typically containing "\E[M" or "\E[<".
+     * We need the former in xmouse_seq, the latter in xmouse_extended_seq.
+     * See tickets 2956, 3954, and 4063 for details. */
+    if (xmouse_seq != NULL)
+    {
+        if (strcmp (xmouse_seq, ESC_STR "[<") == 0)
+            xmouse_seq = ESC_STR "[M";
+
+        xmouse_extended_seq = ESC_STR "[<";
+    }
+}
+
+/* --------------------------------------------------------------------------------------------- */