1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 #include <thread.h>
5 #include <cursor.h>
6 #include <mouse.h>
7 #include <keyboard.h>
8 #include <frame.h>
9 #include <fcall.h>
10 #include <plumb.h>
11 #include "dat.h"
12 #include "fns.h"
13 
14 static	Point		prevmouse;
15 static	Window	*mousew;
16 
17 Range
18 range(int q0, int q1)
19 {
20 	Range r;
21 
22 	r.q0 = q0;
23 	r.q1 = q1;
24 	return r;
25 }
26 
27 Runestr
28 runestr(Rune *r, uint n)
29 {
30 	Runestr rs;
31 
32 	rs.r = r;
33 	rs.nr = n;
34 	return rs;
35 }
36 
37 void
38 cvttorunes(char *p, int n, Rune *r, int *nb, int *nr, int *nulls)
39 {
40 	uchar *q;
41 	Rune *s;
42 	int j, w;
43 
44 	/*
45 	 * Always guaranteed that n bytes may be interpreted
46 	 * without worrying about partial runes.  This may mean
47 	 * reading up to UTFmax-1 more bytes than n; the caller
48 	 * knows this.  If n is a firm limit, the caller should
49 	 * set p[n] = 0.
50 	 */
51 	q = (uchar*)p;
52 	s = r;
53 	for(j=0; j<n; j+=w){
54 		if(*q < Runeself){
55 			w = 1;
56 			*s = *q++;
57 		}else{
58 			w = chartorune(s, (char*)q);
59 			q += w;
60 		}
61 		if(*s)
62 			s++;
63 		else if(nulls)
64 			*nulls = TRUE;
65 	}
66 	*nb = (char*)q-p;
67 	*nr = s-r;
68 }
69 
70 void
71 error(char *s)
72 {
73 	fprint(2, "acme: %s: %r\n", s);
74 	abort();
75 }
76 
77 Window*
78 errorwin1(Rune *dir, int ndir, Rune **incl, int nincl)
79 {
80 	Window *w;
81 	Rune *r;
82 	int i, n;
83 	static Rune Lpluserrors[] = { '+', 'E', 'r', 'r', 'o', 'r', 's', 0 };
84 
85 	r = runemalloc(ndir+8);
86 	if(n = ndir){	/* assign = */
87 		runemove(r, dir, ndir);
88 		r[n++] = L'/';
89 	}
90 	runemove(r+n, Lpluserrors, 7);
91 	n += 7;
92 	w = lookfile(r, n);
93 	if(w == nil){
94 		if(row.ncol == 0)
95 			if(rowadd(&row, nil, -1) == nil)
96 				error("can't create column to make error window");
97 		w = coladd(row.col[row.ncol-1], nil, nil, -1);
98 		w->filemenu = FALSE;
99 		winsetname(w, r, n);
100 	}
101 	free(r);
102 	for(i=nincl; --i>=0; ){
103 		n = runestrlen(incl[i]);
104 		r = runemalloc(n);
105 		runemove(r, incl[i], n);
106 		winaddincl(w, r, n);
107 	}
108 	w->autoindent = globalautoindent;
109 	return w;
110 }
111 
112 /* make new window, if necessary; return with it locked */
113 Window*
114 errorwin(Mntdir *md, int owner)
115 {
116 	Window *w;
117 
118 	for(;;){
119 		if(md == nil)
120 			w = errorwin1(nil, 0, nil, 0);
121 		else
122 			w = errorwin1(md->dir, md->ndir, md->incl, md->nincl);
123 		winlock(w, owner);
124 		if(w->col != nil)
125 			break;
126 		/* window was deleted too fast */
127 		winunlock(w);
128 	}
129 	return w;
130 }
131 
132 typedef struct Warning Warning;
133 
134 struct Warning{
135 	Mntdir *md;
136 	Buffer buf;
137 	Warning *next;
138 };
139 
140 static Warning *warnings;
141 
142 static
143 void
144 addwarningtext(Mntdir *md, Rune *r, int nr)
145 {
146 	Warning *warn;
147 	
148 	for(warn = warnings; warn; warn=warn->next){
149 		if(warn->md == md){
150 			bufinsert(&warn->buf, warn->buf.nc, r, nr);
151 			return;
152 		}
153 	}
154 	warn = emalloc(sizeof(Warning));
155 	warn->next = warnings;
156 	warn->md = md;
157 	if(md)
158 		fsysincid(md);
159 	warnings = warn;
160 	bufinsert(&warn->buf, 0, r, nr);
161 	nbsendp(cwarn, 0);
162 }
163 
164 /* called while row is locked */
165 void
166 flushwarnings(void)
167 {
168 	Warning *warn, *next;
169 	Window *w;
170 	Text *t;
171 	int owner, nr, q0, n;
172 	Rune *r;
173 
174 	if(row.ncol == 0){	/* really early error */
175 		rowinit(&row, screen->clipr);
176 		rowadd(&row, nil, -1);
177 		rowadd(&row, nil, -1);
178 		if(row.ncol == 0)
179 			error("initializing columns in flushwarnings()");
180 	}
181 
182 	for(warn=warnings; warn; warn=next) {
183 		w = errorwin(warn->md, 'E');
184 		t = &w->body;
185 		owner = w->owner;
186 		if(owner == 0)
187 			w->owner = 'E';
188 		wincommit(w, t);
189 		/*
190 		 * Most commands don't generate much output. For instance,
191 		 * Edit ,>cat goes through /dev/cons and is already in blocks
192 		 * because of the i/o system, but a few can.  Edit ,p will
193 		 * put the entire result into a single hunk.  So it's worth doing
194 		 * this in blocks (and putting the text in a buffer in the first
195 		 * place), to avoid a big memory footprint.
196 		 */
197 		r = fbufalloc();
198 		q0 = t->file->b.nc;
199 		for(n = 0; n < warn->buf.nc; n += nr){
200 			nr = warn->buf.nc - n;
201 			if(nr > RBUFSIZE)
202 				nr = RBUFSIZE;
203 			bufread(&warn->buf, n, r, nr);
204 			textbsinsert(t, t->file->b.nc, r, nr, TRUE, &nr);
205 		}
206 		textshow(t, q0, t->file->b.nc, 1);
207 		free(r);
208 		winsettag(t->w);
209 		textscrdraw(t);
210 		w->owner = owner;
211 		w->dirty = FALSE;
212 		winunlock(w);
213 		bufclose(&warn->buf);
214 		next = warn->next;
215 		if(warn->md)
216 			fsysdelid(warn->md);
217 		free(warn);
218 	}
219 	warnings = nil;
220 }
221 
222 void
223 warning(Mntdir *md, char *s, ...)
224 {
225 	Rune *r;
226 	va_list arg;
227 
228 	va_start(arg, s);
229 	r = runevsmprint(s, arg);
230 	va_end(arg);
231 	if(r == nil)
232 		error("runevsmprint failed");
233 	addwarningtext(md, r, runestrlen(r));
234 }
235 
236 int
237 runeeq(Rune *s1, uint n1, Rune *s2, uint n2)
238 {
239 	if(n1 != n2)
240 		return FALSE;
241 	return memcmp(s1, s2, n1*sizeof(Rune)) == 0;
242 }
243 
244 uint
245 min(uint a, uint b)
246 {
247 	if(a < b)
248 		return a;
249 	return b;
250 }
251 
252 uint
253 max(uint a, uint b)
254 {
255 	if(a > b)
256 		return a;
257 	return b;
258 }
259 
260 char*
261 runetobyte(Rune *r, int n)
262 {
263 	char *s;
264 
265 	if(r == nil)
266 		return nil;
267 	s = emalloc(n*UTFmax+1);
268 	setmalloctag(s, getcallerpc(&r));
269 	snprint(s, n*UTFmax+1, "%.*S", n, r);
270 	return s;
271 }
272 
273 Rune*
274 bytetorune(char *s, int *ip)
275 {
276 	Rune *r;
277 	int nb, nr;
278 
279 	nb = strlen(s);
280 	r = runemalloc(nb+1);
281 	cvttorunes(s, nb, r, &nb, &nr, nil);
282 	r[nr] = '\0';
283 	*ip = nr;
284 	return r;
285 }
286 
287 int
288 isalnum(Rune c)
289 {
290 	/*
291 	 * Hard to get absolutely right.  Use what we know about ASCII
292 	 * and assume anything above the Latin control characters is
293 	 * potentially an alphanumeric.
294 	 */
295 	if(c <= ' ')
296 		return FALSE;
297 	if(0x7F<=c && c<=0xA0)
298 		return FALSE;
299 	if(utfrune("!\"#$%&'()*+,-./:;<=>?@[\\]^`{|}~", c))
300 		return FALSE;
301 	return TRUE;
302 }
303 
304 int
305 rgetc(void *v, uint n)
306 {
307 	return ((Rune*)v)[n];
308 }
309 
310 int
311 tgetc(void *a, uint n)
312 {
313 	Text *t;
314 
315 	t = a;
316 	if(n >= t->file->b.nc)
317 		return 0;
318 	return textreadc(t, n);
319 }
320 
321 Rune*
322 skipbl(Rune *r, int n, int *np)
323 {
324 	while(n>0 && (*r==' ' || *r=='\t' || *r=='\n')){
325 		--n;
326 		r++;
327 	}
328 	*np = n;
329 	return r;
330 }
331 
332 Rune*
333 findbl(Rune *r, int n, int *np)
334 {
335 	while(n>0 && *r!=' ' && *r!='\t' && *r!='\n'){
336 		--n;
337 		r++;
338 	}
339 	*np = n;
340 	return r;
341 }
342 
343 void
344 savemouse(Window *w)
345 {
346 	prevmouse = mouse->xy;
347 	mousew = w;
348 }
349 
350 void
351 restoremouse(Window *w)
352 {
353 	if(mousew!=nil && mousew==w)
354 		moveto(mousectl, prevmouse);
355 	mousew = nil;
356 }
357 
358 void
359 clearmouse()
360 {
361 	mousew = nil;
362 }
363 
364 char*
365 estrdup(char *s)
366 {
367 	char *t;
368 
369 	t = strdup(s);
370 	if(t == nil)
371 		error("strdup failed");
372 	setmalloctag(t, getcallerpc(&s));
373 	return t;
374 }
375 
376 void*
377 emalloc(uint n)
378 {
379 	void *p;
380 
381 	p = malloc(n);
382 	if(p == nil){
383 		fprint(2, "allocating %d from %lux: %r\n", n, getcallerpc(&n));
384 		*(int*)0=0;
385 		error("malloc failed");
386 	}
387 	setmalloctag(p, getcallerpc(&n));
388 	memset(p, 0, n);
389 	return p;
390 }
391 
392 void*
393 erealloc(void *p, uint n)
394 {
395 	p = realloc(p, n);
396 	if(p == nil){
397 		fprint(2, "reallocating %d: %r\n", n);
398 		error("realloc failed");
399 	}
400 	setmalloctag(p, getcallerpc(&n));
401 	return p;
402 }
403 
404 /*
405  * Heuristic city.
406  */
407 Window*
408 makenewwindow(Text *t)
409 {
410 	Column *c;
411 	Window *w, *bigw, *emptyw;
412 	Text *emptyb;
413 	int i, y, el;
414 
415 	if(activecol)
416 		c = activecol;
417 	else if(seltext && seltext->col)
418 		c = seltext->col;
419 	else if(t && t->col)
420 		c = t->col;
421 	else{
422 		if(row.ncol==0 && rowadd(&row, nil, -1)==nil)
423 			error("can't make column");
424 		c = row.col[row.ncol-1];
425 	}
426 	activecol = c;
427 	if(t==nil || t->w==nil || c->nw==0)
428 		return coladd(c, nil, nil, -1);
429 
430 	/* find biggest window and biggest blank spot */
431 	emptyw = c->w[0];
432 	bigw = emptyw;
433 	for(i=1; i<c->nw; i++){
434 		w = c->w[i];
435 		/* use >= to choose one near bottom of screen */
436 		if(w->body.fr.maxlines >= bigw->body.fr.maxlines)
437 			bigw = w;
438 		if(w->body.fr.maxlines-w->body.fr.nlines >= emptyw->body.fr.maxlines-emptyw->body.fr.nlines)
439 			emptyw = w;
440 	}
441 	emptyb = &emptyw->body;
442 	el = emptyb->fr.maxlines-emptyb->fr.nlines;
443 	/* if empty space is big, use it */
444 	if(el>15 || (el>3 && el>(bigw->body.fr.maxlines-1)/2))
445 		y = emptyb->fr.r.min.y+emptyb->fr.nlines*font->height;
446 	else{
447 		/* if this window is in column and isn't much smaller, split it */
448 		if(t->col==c && Dy(t->w->r)>2*Dy(bigw->r)/3)
449 			bigw = t->w;
450 		y = (bigw->r.min.y + bigw->r.max.y)/2;
451 	}
452 	w = coladd(c, nil, nil, y);
453 	if(w->body.fr.maxlines < 2)
454 		colgrow(w->col, w, 1);
455 	return w;
456 }