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[dragonfly.git] / usr.bin / window / wwwrite.c
1 /*      @(#)wwwrite.c   8.1 (Berkeley) 6/6/93   */
2 /*      $NetBSD: wwwrite.c,v 1.9 2009/04/14 08:50:06 lukem Exp $        */
3
4 /*
5  * Copyright (c) 1983, 1993
6  *      The Regents of the University of California.  All rights reserved.
7  *
8  * This code is derived from software contributed to Berkeley by
9  * Edward Wang at The University of California, Berkeley.
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 University nor the names of its contributors
20  *    may be used to endorse or promote products derived from this software
21  *    without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  */
35
36 #include "ww.h"
37 #include "tt.h"
38 #include "xx.h"
39 #include "char.h"
40
41 #define UPDATE() \
42         if (!ISSET(w->ww_wflags, WWW_NOUPDATE) && w->ww_cur.r >= 0 && \
43             w->ww_cur.r < wwnrow && wwtouched[w->ww_cur.r]) \
44                 wwupdate1(w->ww_cur.r, w->ww_cur.r + 1)
45
46 /*
47  * To support control character expansion, we save the old
48  * p and q values in r and s, and point p at the beginning
49  * of the expanded string, and q at some safe place beyond it
50  * (p + 10).  At strategic points in the loops, we check
51  * for (r && !*p) and restore the saved values back into
52  * p and q.  Essentially, we implement a stack of depth 2,
53  * to avoid recursion, which might be a better idea.
54  */
55 int
56 wwwrite(struct ww *w, const char *p, int n)
57 {
58         int hascursor;
59         const char *savep = p;
60         const char *q = p + n;
61         const char *r = 0;
62         const char *s = 0;
63
64 #ifdef lint
65         s = 0;                  /* define it before possible use */
66 #endif
67         hascursor = ISSET(w->ww_wflags, WWW_HASCURSOR);
68         if (hascursor)
69                 wwcursor(w, 0);
70         while (p < q && !ISSET(w->ww_pflags, WWP_STOPPED) &&
71             (!wwinterrupt() || ISSET(w->ww_wflags, WWW_NOINTR))) {
72                 if (r && !*p) {
73                         p = r;
74                         q = s;
75                         r = 0;
76                         continue;
77                 }
78                 if (w->ww_wstate == 0 &&
79                     (isprt(*p) ||
80                     (ISSET(w->ww_wflags, WWW_UNCTRL) && isunctrl(*p)))) {
81                         int i;
82                         union ww_char *bp;
83                         int col, col1;
84
85                         if (ISSET(w->ww_wflags, WWW_INSERT)) {
86                                 /* this is very slow */
87                                 if (*p == '\t') {
88                                         p++;
89                                         w->ww_cur.c += 8 -
90                                                 ((w->ww_cur.c - w->ww_w.l) & 7);
91                                         goto chklf;
92                                 }
93                                 if (!isprt(*p)) {
94                                         r = p + 1;
95                                         s = q;
96                                         p = unctrl(*p);
97                                         q = p + 10;
98                                 }
99                                 wwinschar(w, w->ww_cur.r, w->ww_cur.c,
100                                         *p++, w->ww_modes);
101                                 goto right;
102                         }
103
104                         bp = &w->ww_buf[w->ww_cur.r][w->ww_cur.c];
105                         i = w->ww_cur.c;
106                         while (i < w->ww_w.r && p < q)
107                                 if (!*p && r) {
108                                         p = r;
109                                         q = s;
110                                         r = 0;
111                                 } else if (*p == '\t') {
112                                         int tmp = 8 - ((i - w->ww_w.l) & 7);
113                                         p++;
114                                         i += tmp;
115                                         bp += tmp;
116                                 } else if (isprt(*p)) {
117                                         bp++->c_w = *p++
118                                                 | w->ww_modes << WWC_MSHIFT;
119                                         i++;
120                                 } else if (ISSET(w->ww_wflags, WWW_UNCTRL) &&
121                                            isunctrl(*p)) {
122                                         r = p + 1;
123                                         s = q;
124                                         p = unctrl(*p);
125                                         q = p + 10;
126                                 } else
127                                         break;
128                         col = MAX(w->ww_cur.c, w->ww_i.l);
129                         col1 = MIN(i, w->ww_i.r);
130                         w->ww_cur.c = i;
131                         if (w->ww_cur.r >= w->ww_i.t
132                             && w->ww_cur.r < w->ww_i.b) {
133                                 union ww_char *ns = wwns[w->ww_cur.r];
134                                 unsigned char *smap =
135                                     &wwsmap[w->ww_cur.r][col];
136                                 char *win = w->ww_win[w->ww_cur.r];
137                                 int nchanged = 0;
138
139                                 bp = w->ww_buf[w->ww_cur.r];
140                                 for (i = col; i < col1; i++)
141                                         if (*smap++ == w->ww_index) {
142                                                 nchanged++;
143                                                 ns[i].c_w = bp[i].c_w
144                                                         ^ win[i] << WWC_MSHIFT;
145                                         }
146                                 if (nchanged > 0)
147                                         wwtouched[w->ww_cur.r] |= WWU_TOUCHED;
148                         }
149                 chklf:
150                         if (w->ww_cur.c >= w->ww_w.r)
151                                 goto crlf;
152                 } else switch (w->ww_wstate) {
153                 case 0:
154                         switch (*p++) {
155                         case '\n':
156                                 if (ISSET(w->ww_wflags, WWW_MAPNL))
157                 crlf:
158                                         w->ww_cur.c = w->ww_w.l;
159                 lf:
160                                 UPDATE();
161                                 if (++w->ww_cur.r >= w->ww_w.b) {
162                                         w->ww_cur.r = w->ww_w.b - 1;
163                                         if (w->ww_w.b < w->ww_b.b) {
164                                                 (void) wwscroll1(w, w->ww_i.t,
165                                                         w->ww_i.b, 1, 0);
166                                                 w->ww_buf++;
167                                                 w->ww_b.t--;
168                                                 w->ww_b.b--;
169                                         } else
170                                                 wwdelline(w, w->ww_b.t);
171                                 }
172                                 break;
173                         case '\b':
174                                 if (--w->ww_cur.c < w->ww_w.l) {
175                                         w->ww_cur.c = w->ww_w.r - 1;
176                                         goto up;
177                                 }
178                                 break;
179                         case '\r':
180                                 w->ww_cur.c = w->ww_w.l;
181                                 break;
182                         case ctrl('g'):
183                                 ttputc(ctrl('g'));
184                                 break;
185                         case ctrl('['):
186                                 w->ww_wstate = 1;
187                                 break;
188                         }
189                         break;
190                 case 1:
191                         w->ww_wstate = 0;
192                         switch (*p++) {
193                         case '@':
194                                 SET(w->ww_wflags, WWW_INSERT);
195                                 break;
196                         case 'A':
197                 up:
198                                 UPDATE();
199                                 if (--w->ww_cur.r < w->ww_w.t) {
200                                         w->ww_cur.r = w->ww_w.t;
201                                         if (w->ww_w.t > w->ww_b.t) {
202                                                 (void) wwscroll1(w, w->ww_i.t,
203                                                         w->ww_i.b, -1, 0);
204                                                 w->ww_buf--;
205                                                 w->ww_b.t++;
206                                                 w->ww_b.b++;
207                                         } else
208                                                 wwinsline(w, w->ww_b.t);
209                                 }
210                                 break;
211                         case 'B':
212                                 goto lf;
213                         case 'C':
214                 right:
215                                 w->ww_cur.c++;
216                                 goto chklf;
217                         case 'E':
218                                 w->ww_buf -= w->ww_w.t - w->ww_b.t;
219                                 w->ww_b.t = w->ww_w.t;
220                                 w->ww_b.b = w->ww_b.t + w->ww_b.nr;
221                                 w->ww_cur.r = w->ww_w.t;
222                                 w->ww_cur.c = w->ww_w.l;
223                                 wwclreos(w, w->ww_w.t, w->ww_w.l);
224                                 break;
225                         case 'H':
226                                 UPDATE();
227                                 w->ww_cur.r = w->ww_w.t;
228                                 w->ww_cur.c = w->ww_w.l;
229                                 break;
230                         case 'J':
231                                 wwclreos(w, w->ww_cur.r, w->ww_cur.c);
232                                 break;
233                         case 'K':
234                                 wwclreol(w, w->ww_cur.r, w->ww_cur.c);
235                                 break;
236                         case 'L':
237                                 UPDATE();
238                                 wwinsline(w, w->ww_cur.r);
239                                 break;
240                         case 'M':
241                                 wwdelline(w, w->ww_cur.r);
242                                 break;
243                         case 'N':
244                                 wwdelchar(w, w->ww_cur.r, w->ww_cur.c);
245                                 break;
246                         case 'O':
247                                 CLR(w->ww_wflags, WWW_INSERT);
248                                 break;
249                         case 'P':
250                                 wwinschar(w, w->ww_cur.r, w->ww_cur.c, ' ', 0);
251                                 break;
252                         case 'X':
253                                 wwupdate();
254                                 break;
255                         case 'Y':
256                                 UPDATE();
257                                 w->ww_wstate = 2;
258                                 break;
259                         case 'Z':
260                                 wwupdate();
261                                 xxflush(0);
262                                 break;
263                         case 's':
264                                 w->ww_wstate = 4;
265                                 break;
266                         case 'r':
267                                 w->ww_wstate = 5;
268                                 break;
269                         }
270                         break;
271                 case 2:
272                         w->ww_cur.r = w->ww_w.t +
273                                 (unsigned)(*p++ - ' ') % w->ww_w.nr;
274                         w->ww_wstate = 3;
275                         break;
276                 case 3:
277                         w->ww_cur.c = w->ww_w.l +
278                                 (unsigned)(*p++ - ' ') % w->ww_w.nc;
279                         w->ww_wstate = 0;
280                         break;
281                 case 4:
282                         w->ww_modes |= *p++ & wwavailmodes;
283                         w->ww_wstate = 0;
284                         break;
285                 case 5:
286                         w->ww_modes &= ~*p++;
287                         w->ww_wstate = 0;
288                         break;
289                 }
290         }
291         if (hascursor)
292                 wwcursor(w, 1);
293         wwnwwr++;
294         wwnwwra += n;
295         n = p - savep;
296         wwnwwrc += n;
297         return n;
298 }