1/*
2 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
3 * Use is subject to license terms.
4 */
5
6/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
7/*	  All Rights Reserved  	*/
8
9/*
10 * Copyright (c) 1980 Regents of the University of California.
11 * All rights reserved.  The Berkeley software License Agreement
12 * specifies the terms and conditions for redistribution.
13 */
14
15#pragma ident	"%Z%%M%	%I%	%E% SMI"
16
17/*LINTLIBRARY*/
18
19#ifndef lint
20static char
21sccsid[] = "@(#)newwin.c 1.7 89/07/13 SMI"; /* from UCB 5.1 85/06/07 */
22#endif	/* not lint */
23
24/*
25 * allocate space for and set up defaults for a new window
26 *
27 */
28
29#include	"curses.ext"
30#include 	<malloc.h>
31
32#define	SMALLOC	(short *)malloc
33
34/* forward declaration */
35static WINDOW *makenew(int, int, int, int);
36
37#undef		nl	/* don't need it here, and it interferes	*/
38
39WINDOW *
40newwin(int num_lines, int num_cols, int begy, int begx)
41{
42	WINDOW	*win;
43	char	*sp;
44	int	i, by, bx, nl, nc;
45	int	j;
46
47	by = begy;
48	bx = begx;
49	nl = num_lines;
50	nc = num_cols;
51
52	if (nl == 0)
53		nl = LINES - by;
54	if (nc == 0)
55		nc = COLS - bx;
56	if ((win = makenew(nl, nc, by, bx)) == NULL)
57		return (ERR);
58	if ((win->_firstch = SMALLOC(nl * sizeof (win->_firstch[0]))) == NULL) {
59		free(win->_y);
60		free(win);
61		return (NULL);
62	}
63	if ((win->_lastch = SMALLOC(nl * sizeof (win->_lastch[0]))) == NULL) {
64		free(win->_y);
65		free(win->_firstch);
66		free(win);
67		return (NULL);
68	}
69	win->_nextp = win;
70	for (i = 0; i < nl; i++) {
71		win->_firstch[i] = _NOCHANGE;
72		win->_lastch[i] = _NOCHANGE;
73	}
74	for (i = 0; i < nl; i++)
75		if ((win->_y[i] = malloc(nc * sizeof (win->_y[0]))) == NULL) {
76			for (j = 0; j < i; j++)
77				free(win->_y[j]);
78			free(win->_firstch);
79			free(win->_lastch);
80			free(win->_y);
81			free(win);
82			return (ERR);
83		}
84		else
85			for (sp = win->_y[i]; sp < win->_y[i] + nc; )
86				*sp++ = ' ';
87	win->_ch_off = 0;
88#ifdef DEBUG
89	fprintf(outf, "NEWWIN: win->_ch_off = %d\n", win->_ch_off);
90#endif
91	return (win);
92}
93
94WINDOW *
95subwin(WINDOW *orig, int num_lines, int num_cols, int begy, int begx)
96{
97	WINDOW	*win;
98	int	by, bx, nl, nc;
99
100	by = begy;
101	bx = begx;
102	nl = num_lines;
103	nc = num_cols;
104
105	/*
106	 * make sure window fits inside the original one
107	 */
108#ifdef	DEBUG
109	fprintf(outf, "SUBWIN(%0.2o, %d, %d, %d, %d)\n", orig, nl, nc, by, bx);
110#endif
111	if (by < orig->_begy || bx < orig->_begx ||
112	    by + nl > orig->_maxy + orig->_begy ||
113	    bx + nc > orig->_maxx + orig->_begx)
114		return (ERR);
115	if (nl == 0)
116		nl = orig->_maxy + orig->_begy - by;
117	if (nc == 0)
118		nc = orig->_maxx + orig->_begx - bx;
119	if ((win = makenew(nl, nc, by, bx)) == NULL)
120		return (ERR);
121	win->_nextp = orig->_nextp;
122	orig->_nextp = win;
123	win->_orig = orig;
124	_set_subwin_(orig, win);
125	return (win);
126}
127
128/*
129 * this code is shared with mvwin()
130 */
131
132void
133_set_subwin_(WINDOW *orig, WINDOW *win)
134{
135	int	i, j, k;
136
137	j = win->_begy - orig->_begy;
138	k = win->_begx - orig->_begx;
139	win->_ch_off = (short)k;
140#ifdef DEBUG
141	fprintf(outf, "_SET_SUBWIN_: win->_ch_off = %d\n", win->_ch_off);
142#endif
143	win->_firstch = &orig->_firstch[j];
144	win->_lastch = &orig->_lastch[j];
145	for (i = 0; i < win->_maxy; i++, j++)
146		win->_y[i] = &orig->_y[j][k];
147
148}
149
150/*
151 *	This routine sets up a window buffer and returns a pointer to it.
152 */
153
154static WINDOW *
155makenew(int num_lines, int num_cols, int begy, int begx)
156{
157	WINDOW	*win;
158	int	by, bx, nl, nc;
159
160	by = begy;
161	bx = begx;
162	nl = num_lines;
163	nc = num_cols;
164
165#ifdef	DEBUG
166	fprintf(outf, "MAKENEW(%d, %d, %d, %d)\n", nl, nc, by, bx);
167#endif
168	if ((win = (WINDOW *) malloc(sizeof (*win))) == NULL)
169		return (NULL);
170#ifdef DEBUG
171	fprintf(outf, "MAKENEW: nl = %d\n", nl);
172#endif
173	if ((win->_y = (char **)malloc(nl * sizeof (win->_y[0]))) == NULL) {
174		free(win);
175		return (NULL);
176	}
177#ifdef DEBUG
178	fprintf(outf, "MAKENEW: nc = %d\n", nc);
179#endif
180	win->_cury = win->_curx = 0;
181	win->_clear = FALSE;
182	win->_maxy = (short)nl;
183	win->_maxx = (short)nc;
184	win->_begy = (short)by;
185	win->_begx = (short)bx;
186	win->_flags = 0;
187	win->_scroll = win->_leave = FALSE;
188	_swflags_(win);
189	win->_orig = NULL;
190#ifdef DEBUG
191	fprintf(outf, "MAKENEW: win->_clear = %d\n", win->_clear);
192	fprintf(outf, "MAKENEW: win->_leave = %d\n", win->_leave);
193	fprintf(outf, "MAKENEW: win->_scroll = %d\n", win->_scroll);
194	fprintf(outf, "MAKENEW: win->_flags = %0.2o\n", win->_flags);
195	fprintf(outf, "MAKENEW: win->_maxy = %d\n", win->_maxy);
196	fprintf(outf, "MAKENEW: win->_maxx = %d\n", win->_maxx);
197	fprintf(outf, "MAKENEW: win->_begy = %d\n", win->_begy);
198	fprintf(outf, "MAKENEW: win->_begx = %d\n", win->_begx);
199#endif
200	return (win);
201}
202
203void
204_swflags_(WINDOW *win)
205{
206	win->_flags &= ~(_ENDLINE|_FULLLINE|_FULLWIN|_SCROLLWIN);
207	if (win->_begx + win->_maxx == COLS) {
208		win->_flags |= _ENDLINE;
209		if (win->_begx == 0) {
210			if (AL && DL)
211				win->_flags |= _FULLLINE;
212			if (win->_maxy == LINES && win->_begy == 0)
213				win->_flags |= _FULLWIN;
214		}
215		if (win->_begy + win->_maxy == LINES)
216			win->_flags |= _SCROLLWIN;
217	}
218}
219