Adding upstream version 0.11.1.upstream/0.11.1upstream

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

1 files changed, 154 insertions, 0 deletions

diff --git a/src/vt52_curses.hh b/src/vt52_curses.hh
new file mode 100644
index 0000000..88c3cb3
--- /dev/null
+++ b/src/vt52_curses.hh
@@ -0,0 +1,154 @@
+/**
+ * Copyright (c) 2007-2012, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @file vt52_curses.hh
+ */
+
+#ifndef vt52_curses_hh
+#define vt52_curses_hh
+
+#include <list>
+#include <string>
+
+#include "view_curses.hh"
+
+/**
+ * VT52 emulator for curses, useful for mediating between curses and readline,
+ * which don't play well together.  It is expected that a subclass of this
+ * class will fork off a child process that sends and receives VT52 keycodes(?)
+ * which is translated by this class into curses calls.
+ *
+ * VT52 seems to be the simplest terminal to emulate since we do not need to
+ * maintain the state of the screen, beyond past lines.  For example, when
+ * inserting a character, VT52 moves the cursor to the insertion point, clears
+ * the rest of the line and then rewrites the rest of the line with the new
+ * character.  This is in contrast to VT100 which moves the cursor to the
+ * insertion point and then sends a code to insert the character and relying
+ * on the terminal to shift the rest of the line to the right a character.
+ */
+class vt52_curses : public view_curses {
+public:
+    /** @param win The curses window this view is attached to. */
+    void set_window(WINDOW* win) { this->vc_window = win; }
+
+    /** @return The curses window this view is attached to. */
+    WINDOW* get_window() { return this->vc_window; }
+
+    void set_left(int left) { this->vc_left = left; }
+
+    int get_left() const { return this->vc_left; }
+
+    /**
+     * Set the Y position of this view on the display.  A value greater than
+     * zero is considered to be an absolute size.  A value less than zero makes
+     * the position relative to the bottom of the enclosing window.
+     *
+     * @param y The Y position of the cursor on the curses display.
+     */
+    void set_y(int y) { this->vc_y = y; }
+
+    /** @return The abs/rel Y position of the cursor on the curses display. */
+    int get_y() const { return this->vc_y; }
+
+    /** @param x The X position of the cursor on the curses display. */
+    void set_x(int x) { this->vc_x = x; }
+
+    /** @return The X position of the cursor on the curses display. */
+    int get_x() const { return this->vc_x; }
+
+    /**
+     * @return The height of this view, which consists of a single line for
+     * input, plus any past lines of output, which will appear ABOVE the Y
+     * position for this view.
+     * @todo Kinda hardwired to the way readline works.
+     */
+    int get_height() { return 1; }
+
+    void set_max_height(int mh) { this->vc_max_height = mh; }
+    int get_max_height() const { return this->vc_max_height; }
+
+    /**
+     * Map an ncurses input keycode to a vt52 sequence.
+     *
+     * @param ch The input character.
+     * @param len_out The length of the returned sequence.
+     * @return The vt52 sequence to send to the child.
+     */
+    const char* map_input(int ch, int& len_out);
+
+    /**
+     * Map VT52 output to ncurses calls.
+     *
+     * @param output VT52 encoded output from the child process.
+     * @param len The length of the output array.
+     */
+    void map_output(const char* output, int len);
+
+    /**
+     * Paints any past lines and moves the cursor to the current X position.
+     */
+    void do_update();
+
+    const static char ESCAPE = 27; /*< VT52 Escape key value. */
+    const static char BACKSPACE = 8; /*< VT52 Backspace key value. */
+    const static char BELL = 7; /*< VT52 Bell value. */
+    const static char STX = 2; /*< VT52 Start-of-text value. */
+
+protected:
+    /** @return The absolute Y position of this view. */
+    int get_actual_y()
+    {
+        unsigned long width, height;
+        int retval;
+
+        getmaxyx(this->vc_window, height, width);
+        if (this->vc_y < 0) {
+            retval = height + this->vc_y;
+        } else {
+            retval = this->vc_y;
+        }
+
+        return retval;
+    }
+
+    WINDOW* vc_window{nullptr}; /*< The window that contains this view. */
+    int vc_left{0};
+    int vc_x{0}; /*< The X position of the cursor. */
+    int vc_y{0}; /*< The Y position of the cursor. */
+    int vc_max_height{0};
+    char vc_escape[16]; /*< Storage for escape sequences. */
+    int vc_escape_len{0}; /*< The number of chars in vc_escape. */
+    int vc_expected_escape_len{-1};
+    char vc_map_buffer{0}; /*<
+                            * Buffer returned by map_input for trivial
+                            * translations (one-to-one).
+                            */
+    attr_line_t vc_line;
+};
+
+#endif