[unix-history] / usr.bin / talk / display.c

/*
 * 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[] = "@(#)display.c	5.4 (Berkeley) 6/1/90";
#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);
}
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) 1983 Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#ifndef lint
	35	static char sccsid[] = "@(#)display.c 5.4 (Berkeley) 6/1/90";
	36	#endif /* not lint */
	37
	38	/*
	39	* The window 'manager', initializes curses and handles the actual
	40	* displaying of text
	41	*/
	42	#include "talk.h"
	43
	44	xwin_t my_win;
	45	xwin_t his_win;
	46	WINDOW *line_win;
	47
	48	int curses_initialized = 0;
	49
	50	/*
	51	* max HAS to be a function, it is called with
	52	* a argument of the form --foo at least once.
	53	*/
	54	max(a,b)
	55	int a, b;
	56	{
	57
	58	return (a > b ? a : b);
	59	}
	60
	61	/*
	62	* Display some text on somebody's window, processing some control
	63	* characters while we are at it.
	64	*/
65	display(win, text, size)
66	register xwin_t *win;
67	register char *text;
68	int size;
69	{
70	register int i;
71	char cch;
72
73	for (i = 0; i < size; i++) {
74	if (*text == '\n') {
75	xscroll(win, 0);
76	text++;
77	continue;
78	}
79	/* erase character */
80	if (*text == win->cerase) {
81	wmove(win->x_win, win->x_line, max(--win->x_col, 0));
82	getyx(win->x_win, win->x_line, win->x_col);
83	waddch(win->x_win, ' ');
84	wmove(win->x_win, win->x_line, win->x_col);
85	getyx(win->x_win, win->x_line, win->x_col);
86	text++;
87	continue;
88	}
89	/*
90	* On word erase search backwards until we find
91	* the beginning of a word or the beginning of
92	* the line.
93	*/
94	if (*text == win->werase) {
95	int endcol, xcol, i, c;
96
97	endcol = win->x_col;
98	xcol = endcol - 1;
99	while (xcol >= 0) {
100	c = readwin(win->x_win, win->x_line, xcol);
101	if (c != ' ')
102	break;
103	xcol--;
104	}
105	while (xcol >= 0) {
106	c = readwin(win->x_win, win->x_line, xcol);
107	if (c == ' ')
108	break;
109	xcol--;
110	}
111	wmove(win->x_win, win->x_line, xcol + 1);
112	for (i = xcol + 1; i < endcol; i++)
113	waddch(win->x_win, ' ');
114	wmove(win->x_win, win->x_line, xcol + 1);
115	getyx(win->x_win, win->x_line, win->x_col);
116	continue;
117	}
118	/* line kill */
119	if (*text == win->kill) {
120	wmove(win->x_win, win->x_line, 0);
121	wclrtoeol(win->x_win);
122	getyx(win->x_win, win->x_line, win->x_col);
123	text++;
124	continue;
125	}
126	if (*text == '\f') {
127	if (win == &my_win)
128	wrefresh(curscr);
129	text++;
130	continue;
131	}
132	if (win->x_col == COLS-1) {
133	/* check for wraparound */
134	xscroll(win, 0);
135	}
136	if (text < ' ' && text != '\t') {
137	waddch(win->x_win, '^');
138	getyx(win->x_win, win->x_line, win->x_col);
139	if (win->x_col == COLS-1) /* check for wraparound */
140	xscroll(win, 0);
141	cch = (*text & 63) + 64;
142	waddch(win->x_win, cch);
143	} else
144	waddch(win->x_win, *text);
145	getyx(win->x_win, win->x_line, win->x_col);
146	text++;
147	}
148	wrefresh(win->x_win);
149	}
150
151	/*
152	* Read the character at the indicated position in win
153	*/
154	readwin(win, line, col)
155	WINDOW *win;
156	{
157	int oldline, oldcol;
158	register int c;
159
160	getyx(win, oldline, oldcol);
161	wmove(win, line, col);
162	c = winch(win);
163	wmove(win, oldline, oldcol);
164	return (c);
165	}
166
167	/*
168	* Scroll a window, blanking out the line following the current line
169	* so that the current position is obvious
170	*/
171	xscroll(win, flag)
172	register xwin_t *win;
173	int flag;
174	{
175
176	if (flag == -1) {
177	wmove(win->x_win, 0, 0);
178	win->x_line = 0;
179	win->x_col = 0;
180	return;
181	}
182	win->x_line = (win->x_line + 1) % win->x_nlines;
183	win->x_col = 0;
184	wmove(win->x_win, win->x_line, win->x_col);
185	wclrtoeol(win->x_win);
186	wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col);
187	wclrtoeol(win->x_win);
188	wmove(win->x_win, win->x_line, win->x_col);
189	}