1 /* $NetBSD: ins_wch.c,v 1.21 2024/12/23 02:58:03 blymn Exp $ */
2
3 /*
4 * Copyright (c) 2005 The NetBSD Foundation Inc.
5 * All rights reserved.
6 *
7 * This code is derived from code donated to the NetBSD Foundation
8 * by Ruibiao Qiu <ruibiao@arl.wustl.edu,ruibiao@gmail.com>.
9 *
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the NetBSD Foundation nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
24 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
25 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37 #include <sys/cdefs.h>
38 #ifndef lint
39 __RCSID("$NetBSD: ins_wch.c,v 1.21 2024/12/23 02:58:03 blymn Exp $");
40 #endif /* not lint */
41
42 #include <string.h>
43 #include <stdlib.h>
44
45 #include "curses.h"
46 #include "curses_private.h"
47
48 /*
49 * ins_wch --
50 * Do an insert-char on the line, leaving (cury, curx) unchanged.
51 */
52 int
ins_wch(const cchar_t * wch)53 ins_wch(const cchar_t *wch)
54 {
55 return wins_wch(stdscr, wch);
56 }
57
58 /*
59 * mvins_wch --
60 * Do an insert-char on the line at (y, x).
61 */
62 int
mvins_wch(int y,int x,const cchar_t * wch)63 mvins_wch(int y, int x, const cchar_t *wch)
64 {
65 return mvwins_wch(stdscr, y, x, wch);
66 }
67
68 /*
69 * mvwins_wch --
70 * Do an insert-char on the line at (y, x) in the given window.
71 */
72 int
mvwins_wch(WINDOW * win,int y,int x,const cchar_t * wch)73 mvwins_wch(WINDOW *win, int y, int x, const cchar_t *wch)
74 {
75 if (wmove(win, y, x) == ERR)
76 return ERR;
77
78 return wins_wch(win, wch);
79 }
80
81 /*
82 * wins_wch --
83 * Do an insert-char on the line, leaving (cury, curx) unchanged.
84 */
85 int
wins_wch(WINDOW * win,const cchar_t * wch)86 wins_wch(WINDOW *win, const cchar_t *wch)
87 {
88 __LDATA *start, *temp1, *temp2;
89 __LINE *lnp;
90 int cw, pcw, x, y, sx, ex, newx, i;
91 nschar_t *np, *tnp;
92 wchar_t ws[] = L" ";
93
94 if (__predict_false(win == NULL))
95 return ERR;
96
97 /* check for non-spacing characters */
98 if (!wch)
99 return OK;
100 cw = wcwidth(wch->vals[0]);
101 __CTRACE(__CTRACE_INPUT, "wins_wch: wcwidth %d\n", cw);
102 if (cw < 0)
103 cw = 1;
104 if (!cw)
105 return wadd_wch( win, wch );
106
107 x = win->curx;
108 y = win->cury;
109 __CTRACE(__CTRACE_INPUT, "wins_wch: (%d,%d)\n", y, x);
110 switch (wch->vals[0]) {
111 case L'\b':
112 if (--x < 0)
113 x = 0;
114 win->curx = x;
115 return OK;
116 case L'\r':
117 win->curx = 0;
118 return OK;
119 case L'\n':
120 wclrtoeol(win);
121 if (y == win->scr_b) {
122 if (!(win->flags & __SCROLLOK))
123 return ERR;
124 scroll(win);
125 }
126 return OK;
127 case L'\t':
128 if (wins_nwstr(win, ws, min(win->maxx - x,
129 TABSIZE - (x % TABSIZE))) == ERR)
130 return ERR;
131 return OK;
132 }
133
134 /* locate current cell */
135 x = win->curx;
136 y = win->cury;
137 lnp = win->alines[y];
138 start = &win->alines[y]->line[x];
139 sx = x;
140 pcw = start->wcols;
141 if (pcw < 0) {
142 start += pcw;
143 sx += pcw;
144 }
145 if (cw > win->maxx - sx)
146 return ERR;
147 lnp->flags |= __ISDIRTY;
148 newx = sx + win->ch_off;
149 if (newx < *lnp->firstchp)
150 *lnp->firstchp = newx;
151
152 /* shift all complete characters */
153 __CTRACE(__CTRACE_INPUT, "wins_wch: shift all characters\n");
154 temp1 = &win->alines[y]->line[win->maxx - 1];
155 temp2 = temp1 - cw;
156 pcw = (temp2 + 1)->wcols;
157 if (pcw < 0) {
158 __CTRACE(__CTRACE_INPUT, "wins_wch: clear EOL\n");
159 temp2 += pcw;
160 while (temp1 > temp2 + cw) {
161 np = temp1->nsp;
162 if (np) {
163 while (np) {
164 tnp = np->next;
165 free(np);
166 np = tnp;
167 }
168 temp1->nsp = NULL;
169 }
170 temp1->ch = win->bch;
171 if (_cursesi_copy_nsp(win->bnsp, temp1) == ERR)
172 return ERR;
173 temp1->attr = win->battr;
174 temp1->wcols = 1;
175 temp1--;
176 }
177 }
178 while (temp2 >= start) {
179 (void)memcpy(temp1, temp2, sizeof(__LDATA));
180 temp1--, temp2--;
181 }
182
183 /* update character under cursor */
184 start->nsp = NULL;
185 start->ch = wch->vals[0];
186 start->attr = wch->attributes & WA_ATTRIBUTES;
187 start->wcols = cw;
188 if (wch->elements > 1) {
189 for (i = 1; i < wch->elements; i++) {
190 np = malloc(sizeof(nschar_t));
191 if (!np)
192 return ERR;
193 np->ch = wch->vals[i];
194 np->next = start->nsp;
195 start->nsp = np;
196 }
197 }
198 __CTRACE(__CTRACE_INPUT, "wins_wch: insert (%x,%x,%p)\n",
199 start->ch, start->attr, start->nsp);
200 temp1 = start + 1;
201 ex = x + 1;
202 while (ex - x < cw) {
203 temp1->ch = wch->vals[0];
204 temp1->wcols = x - ex;
205 temp1->nsp = NULL;
206 temp1->cflags |= CA_CONTINUATION;
207 ex++, temp1++;
208 }
209
210 newx = win->maxx - 1 + win->ch_off;
211 if (newx > *lnp->lastchp)
212 *lnp->lastchp = newx;
213 __touchline(win, y, sx, (int)win->maxx - 1);
214 __sync(win);
215 return OK;
216 }
217