Il CD di internet/CD.iso/SOURCE/N/TCPIP/NETKIT-B.05/NETKIT-B/NetKit-B-0.05/talk/display.c

C/C++ Source or Header | 1993-12-17 | 5.1 KB | 191 lines

/*
 * Copyright (c) 1983 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. 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.
 */

#ifndef lint
/*static char sccsid[] = "from: @(#)display.c    5.4 (Berkeley) 6/1/90";*/
static char rcsid[] = "$Id: display.c,v 1.2 1993/08/01 18:07:53 mycroft Exp $";
#endif /* not lint */

/*
 * The window 'manager', initializes curses and handles the actual
 * displaying of text
 */
#include "talk.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
 * a argument of the form --foo at least once.
 */
max(a,b)
    int a, b;
{

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

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

    for (i = 0; i < size; i++) {
        if (*text == '\n') {
            xscroll(win, 0);
            text++;
            continue;
        }
        /* erase character */
        if (*text == win->cerase) {
            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) {
            int endcol, xcol, i, 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 (i = xcol + 1; i < endcol; i++)
                waddch(win->x_win, ' ');
            wmove(win->x_win, win->x_line, xcol + 1);
            getyx(win->x_win, win->x_line, win->x_col);
            continue;
        }
        /* line kill */
        if (*text == win->kill) {
            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 (win->x_col == COLS-1) {
            /* check for wraparound */
            xscroll(win, 0);
        }
        if (*text < ' ' && *text != '\t') {
            waddch(win->x_win, '^');
            getyx(win->x_win, win->x_line, win->x_col);
            if (win->x_col == COLS-1) /* check for wraparound */
                xscroll(win, 0);
            cch = (*text & 63) + 64;
            waddch(win->x_win, cch);
        } else
            waddch(win->x_win, *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
 */
readwin(win, line, col)
    WINDOW *win;
{
    int oldline, oldcol;
    register int c;

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

/*
 * Scroll a window, blanking out the line following the current line
 * so that the current position is obvious
 */
xscroll(win, flag)
    register xwin_t *win;
    int flag;
{

    if (flag == -1) {
        wmove(win->x_win, 0, 0);
        win->x_line = 0;
        win->x_col = 0;
        return;
    }
    win->x_line = (win->x_line + 1) % win->x_nlines;
    win->x_col = 0;
    wmove(win->x_win, win->x_line, win->x_col);
    wclrtoeol(win->x_win);
    wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col);
    wclrtoeol(win->x_win);
    wmove(win->x_win, win->x_line, win->x_col);
}