/*
 * Copyright (c) 1983, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the University 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.
 *
 * @(#)display.c        8.1 (Berkeley) 6/6/93
 * $FreeBSD: src/usr.bin/talk/display.c,v 1.7 1999/08/28 01:06:11 peter Exp $
 * $DragonFly: src/usr.bin/talk/display.c,v 1.4 2003/10/04 20:36:52 hmp Exp $
 */

/*
 * The window 'manager', initializes curses and handles the actual
 * displaying of text
 */
#include "talk.h"
#include <ctype.h>

xwin_t  my_win;
xwin_t  his_win;
WINDOW  *line_win;

int     curses_initialized = 0;

/*
 * max HAS to be a function, it is called with
 * an argument of the form --foo at least once.
 */
int
max(int a, int b)
{

        return (a > b ? a : b);
}

/*
 * Display some text on somebody's window, processing some control
 * characters while we are at it.
 */
void
display(xwin_t *win, char *text, int size)
{
        int i;
        char cch;

        for (i = 0; i < size; i++) {
                if (*text == '\n' || *text == '\r') {
                        waddch(win->x_win, '\n');
                        getyx(win->x_win, win->x_line, win->x_col);
                        text++;
                        continue;
                }
                if (*text == 004 && win == &my_win) {
                        /* control-D clears the screen */
                        werase(my_win.x_win);
                        getyx(my_win.x_win, my_win.x_line, my_win.x_col);
                        wrefresh(my_win.x_win);
                        werase(his_win.x_win);
                        getyx(his_win.x_win, his_win.x_line, his_win.x_col);
                        wrefresh(his_win.x_win);
                        text++;
                        continue;
                }

                /* erase character */
                if (   *text == win->cerase
                    || *text == 010     /* BS */
                    || *text == 0177    /* DEL */
                   ) {
                        wmove(win->x_win, win->x_line, max(--win->x_col, 0));
                        getyx(win->x_win, win->x_line, win->x_col);
                        waddch(win->x_win, ' ');
                        wmove(win->x_win, win->x_line, win->x_col);
                        getyx(win->x_win, win->x_line, win->x_col);
                        text++;
                        continue;
                }
                /*
                 * On word erase search backwards until we find
                 * the beginning of a word or the beginning of
                 * the line.
                 */
                if (   *text == win->werase
                    || *text == 027     /* ^W */
                   ) {
                        int endcol, xcol, ii, c;

                        endcol = win->x_col;
                        xcol = endcol - 1;
                        while (xcol >= 0) {
                                c = readwin(win->x_win, win->x_line, xcol);
                                if (c != ' ')
                                        break;
                                xcol--;
                        }
                        while (xcol >= 0) {
                                c = readwin(win->x_win, win->x_line, xcol);
                                if (c == ' ')
                                        break;
                                xcol--;
                        }
                        wmove(win->x_win, win->x_line, xcol + 1);
                        for (ii = xcol + 1; ii < endcol; ii++)
                                waddch(win->x_win, ' ');
                        wmove(win->x_win, win->x_line, xcol + 1);
                        getyx(win->x_win, win->x_line, win->x_col);
                        text++;
                        continue;
                }
                /* line kill */
                if (   *text == win->kill
                    || *text == 025     /* ^U */
                   ) {
                        wmove(win->x_win, win->x_line, 0);
                        wclrtoeol(win->x_win);
                        getyx(win->x_win, win->x_line, win->x_col);
                        text++;
                        continue;
                }
                if (*text == '\f') {
                        if (win == &my_win)
                                wrefresh(curscr);
                        text++;
                        continue;
                }
                if (*text == '\7') {
                        write(STDOUT_FILENO, text, 1);
                        text++;
                        continue;
                }
                if (!isprint((unsigned char)*text) && *text != '\t') {
                        waddch(win->x_win, '^');
                        getyx(win->x_win, win->x_line, win->x_col);
                        cch = (*text & 63) + 64;
                        waddch(win->x_win, cch);
                } else
                        waddch(win->x_win, (unsigned char)*text);
                getyx(win->x_win, win->x_line, win->x_col);
                text++;
        }
        wrefresh(win->x_win);
}

/*
 * Read the character at the indicated position in win
 */
int
readwin(WINDOW *win, int line, int col)
{
        int oldline, oldcol;
        int c;

        getyx(win, oldline, oldcol);
        wmove(win, line, col);
        c = winch(win);
        wmove(win, oldline, oldcol);
        return (c);
}