xref: /illumos-gate/usr/src/ucblib/libcurses/newwin.c (revision 7c478bd9)
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
20 static char
21 sccsid[] = "@(#)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 */
35 static WINDOW *makenew(int, int, int, int);
36 
37 #undef		nl	/* don't need it here, and it interferes	*/
38 
39 WINDOW *
newwin(int num_lines,int num_cols,int begy,int begx)40 newwin(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 
94 WINDOW *
subwin(WINDOW * orig,int num_lines,int num_cols,int begy,int begx)95 subwin(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 
132 void
_set_subwin_(WINDOW * orig,WINDOW * win)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 
154 static WINDOW *
makenew(int num_lines,int num_cols,int begy,int begx)155 makenew(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 
203 void
_swflags_(WINDOW * win)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