1 /* $NetBSD: curses.c,v 1.31 2022/10/19 06:09:27 blymn Exp $ */
2
3 /*
4 * Copyright (c) 1981, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #include <stdlib.h>
34 #ifndef lint
35 #if 0
36 static char sccsid[] = "@(#)curses.c 8.3 (Berkeley) 5/4/94";
37 #else
38 __RCSID("$NetBSD: curses.c,v 1.31 2022/10/19 06:09:27 blymn Exp $");
39 #endif
40 #endif /* not lint */
41
42 #include "curses.h"
43 #include "curses_private.h"
44
45 /* Private. */
46 int __echoit = 1; /* If stty indicates ECHO. */
47 int __pfast;
48 int __rawmode = 0; /* If stty indicates RAW mode. */
49 int __noqch = 0;
50 /* If terminal doesn't have
51 * insert/delete line capabilities
52 * for quick change on refresh.
53 */
54 char __CA;
55
56 /*
57 * Public.
58 *
59 * XXX
60 * UPPERCASE isn't used by libcurses, and is left for backward
61 * compatibility only.
62 */
63 WINDOW *curscr; /* Current screen. */
64 WINDOW *stdscr; /* Standard screen. */
65 WINDOW *__virtscr; /* Virtual screen (for doupdate()). */
66 SCREEN *_cursesi_screen; /* the current screen we are using */
67 volatile bool _reentrant; /* If true, some global vars are ro. */
68 int COLS; /* Columns on the screen. */
69 int LINES; /* Lines on the screen. */
70 int ESCDELAY; /* ms delay between keys for esc seq */
71 int TABSIZE; /* Size of a tab. */
72 int COLORS; /* Maximum colors on the screen */
73 int COLOR_PAIRS = 0; /* Maximum color pairs on the screen */
74 int My_term = 0; /* Use Def_term regardless. */
75 const char *Def_term = "unknown"; /* Default terminal type. */
76 char __GT; /* Gtty indicates tabs. */
77 char __NONL; /* Term can't hack LF doing a CR. */
78 char __UPPERCASE; /* Terminal is uppercase only. */
79
80 /* compare two cells on screen, must have the same foreground/background,
81 * and for wide characters the same sequence of non-spacing characters
82 */
83 int
_cursesi_celleq(__LDATA * x,__LDATA * y)84 _cursesi_celleq(__LDATA *x, __LDATA *y)
85 {
86 #ifdef HAVE_WCHAR
87 nschar_t *xnp = x->nsp, *ynp = y->nsp;
88 #endif /* HAVE_WCHAR */
89 int ret = ( x->ch == y->ch ) && ( x->attr == y->attr );
90
91 #ifdef HAVE_WCHAR
92 if (!ret)
93 return 0;
94
95 if ((x->cflags & CA_CONTINUATION) != (y->cflags & CA_CONTINUATION))
96 return 0;
97
98 if (!xnp && !ynp)
99 return 1;
100
101 if ((xnp && !ynp) || (!xnp && ynp))
102 return 0;
103
104 while (xnp && ynp) {
105 if (xnp->ch != ynp->ch)
106 return 0;
107 xnp = xnp->next;
108 ynp = ynp->next;
109 }
110
111 return !xnp && !ynp;
112 #else
113 return ret;
114 #endif /* HAVE_WCHAR */
115 }
116
117 #ifdef HAVE_WCHAR
118 /*
119 * Copy a complex character from source to destination.
120 *
121 */
122 void
_cursesi_copy_wchar(__LDATA * src,__LDATA * dest)123 _cursesi_copy_wchar(__LDATA *src, __LDATA *dest)
124 {
125 dest->ch = src->ch;
126 dest->attr = src->attr;
127 dest->cflags = src->cflags;
128 dest->wcols = src->wcols;
129 _cursesi_copy_nsp(src->nsp, dest);
130 }
131
132 /*
133 * Copy the non-spacing character list (src_nsp) to the given character,
134 * allocate or free storage as required.
135 */
136 int
_cursesi_copy_nsp(nschar_t * src_nsp,struct __ldata * ch)137 _cursesi_copy_nsp(nschar_t *src_nsp, struct __ldata *ch)
138 {
139 nschar_t *np, *tnp, *pnp;
140
141 pnp = NULL;
142 np = src_nsp;
143 if (np) {
144 tnp = ch->nsp;
145 while (np) {
146 if (tnp) {
147 tnp->ch = np->ch;
148 pnp = tnp;
149 tnp = tnp->next;
150 } else {
151 tnp = malloc(sizeof(nschar_t));
152 if (!tnp)
153 return ERR;
154 tnp->ch = np->ch;
155 pnp->next = tnp;
156 tnp->next = NULL;
157 pnp = tnp;
158 tnp = NULL;
159 }
160 np = np->next;
161 }
162 np = tnp;
163 if (np) {
164 pnp->next = NULL;
165 __cursesi_free_nsp(np);
166 }
167 } else {
168 if (ch->nsp) {
169 __cursesi_free_nsp(ch->nsp);
170 ch->nsp = NULL;
171 }
172 }
173
174 return OK;
175 }
176
177 /*
178 * Free the storage associated with a non-spacing character - traverse the
179 * linked list until all storage is done.
180 */
181 void
__cursesi_free_nsp(nschar_t * inp)182 __cursesi_free_nsp(nschar_t *inp)
183 {
184 nschar_t *tnp, *np;
185
186 np = inp;
187 if (np) {
188 while (np) {
189 tnp = np->next;
190 free(np);
191 np = tnp;
192 }
193 }
194 }
195
196 /*
197 * Traverse all the cells in the given window free'ing the non-spacing
198 * character storage.
199 */
200 void
__cursesi_win_free_nsp(WINDOW * win)201 __cursesi_win_free_nsp(WINDOW *win)
202 {
203 int i, j;
204 __LDATA *sp;
205
206 for (i = 0; i < win->maxy; i++) {
207 for (sp = win->alines[i]->line, j = 0; j < win->maxx;
208 j++, sp++) {
209 __cursesi_free_nsp(sp->nsp);
210 }
211 }
212 }
213
214 #endif
215