File: region.c

package info (click to toggle)
mg 20180927-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 696 kB
  • sloc: ansic: 14,387; makefile: 32; sh: 7
file content (686 lines) | stat: -rw-r--r-- 15,008 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
/*	$OpenBSD: region.c,v 1.37 2016/09/09 06:05:51 lum Exp $	*/

/* This file is in the public domain. */

/*
 *		Region based commands.
 * The routines in this file deal with the region, that magic space between
 * "." and mark.  Some functions are commands.  Some functions are just for
 * internal use.
 */

#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "def.h"

#define TIMEOUT 10000

static char leftover[BUFSIZ];

static	int	getregion(struct region *);
static	int	iomux(int, char * const, int, struct buffer *);
static	int	preadin(int, struct buffer *);
static	void	pwriteout(int, char **, int *);
static	int	setsize(struct region *, RSIZE);
static	int	shellcmdoutput(char * const[], char * const, int);

/*
 * Kill the region.  Ask "getregion" to figure out the bounds of the region.
 * Move "." to the start, and kill the characters. Mark is cleared afterwards.
 */
/* ARGSUSED */
int
killregion(int f, int n)
{
	int	s;
	struct region	region;

	if ((s = getregion(&region)) != TRUE)
		return (s);
	/* This is a kill-type command, so do magic kill buffer stuff. */
	if ((lastflag & CFKILL) == 0)
		kdelete();
	thisflag |= CFKILL;
	curwp->w_dotp = region.r_linep;
	curwp->w_doto = region.r_offset;
	curwp->w_dotline = region.r_lineno;
	s = ldelete(region.r_size, KFORW | KREG);
	clearmark(FFARG, 0);

	return (s);
}

/*
 * Copy all of the characters in the region to the kill buffer,
 * clearing the mark afterwards.
 * This is a bit like a kill region followed by a yank.
 */
/* ARGSUSED */
int
copyregion(int f, int n)
{
	struct line	*linep;
	struct region	 region;
	int	 loffs;
	int	 s;

	if ((s = getregion(&region)) != TRUE)
		return (s);

	/* kill type command */
	if ((lastflag & CFKILL) == 0)
		kdelete();
	thisflag |= CFKILL;

	/* current line */
	linep = region.r_linep;

	/* current offset */
	loffs = region.r_offset;

	while (region.r_size--) {
		if (loffs == llength(linep)) {	/* End of line.		 */
			if ((s = kinsert('\n', KFORW)) != TRUE)
				return (s);
			linep = lforw(linep);
			loffs = 0;
		} else {			/* Middle of line.	 */
			if ((s = kinsert(lgetc(linep, loffs), KFORW)) != TRUE)
				return (s);
			++loffs;
		}
	}
	clearmark(FFARG, 0);

	return (TRUE);
}

/*
 * Lower case region.  Zap all of the upper case characters in the region to
 * lower case. Use the region code to set the limits. Scan the buffer, doing
 * the changes. Call "lchange" to ensure that redisplay is done in all
 * buffers.
 */
/* ARGSUSED */
int
lowerregion(int f, int n)
{
	struct line	*linep;
	struct region	 region;
	int	 loffs, c, s;

	if ((s = checkdirty(curbp)) != TRUE)
		return (s);
	if (curbp->b_flag & BFREADONLY) {
		dobeep();
		ewprintf("Buffer is read-only");
		return (FALSE);
	}

	if ((s = getregion(&region)) != TRUE)
		return (s);

	undo_add_change(region.r_linep, region.r_offset, region.r_size);

	lchange(WFFULL);
	linep = region.r_linep;
	loffs = region.r_offset;
	while (region.r_size--) {
		if (loffs == llength(linep)) {
			linep = lforw(linep);
			loffs = 0;
		} else {
			c = lgetc(linep, loffs);
			if (ISUPPER(c) != FALSE)
				lputc(linep, loffs, TOLOWER(c));
			++loffs;
		}
	}
	return (TRUE);
}

/*
 * Upper case region.  Zap all of the lower case characters in the region to
 * upper case.  Use the region code to set the limits.  Scan the buffer,
 * doing the changes.  Call "lchange" to ensure that redisplay is done in all
 * buffers.
 */
/* ARGSUSED */
int
upperregion(int f, int n)
{
	struct line	 *linep;
	struct region	  region;
	int	  loffs, c, s;

	if ((s = checkdirty(curbp)) != TRUE)
		return (s);
	if (curbp->b_flag & BFREADONLY) {
		dobeep();
		ewprintf("Buffer is read-only");
		return (FALSE);
	}
	if ((s = getregion(&region)) != TRUE)
		return (s);

	undo_add_change(region.r_linep, region.r_offset, region.r_size);

	lchange(WFFULL);
	linep = region.r_linep;
	loffs = region.r_offset;
	while (region.r_size--) {
		if (loffs == llength(linep)) {
			linep = lforw(linep);
			loffs = 0;
		} else {
			c = lgetc(linep, loffs);
			if (ISLOWER(c) != FALSE)
				lputc(linep, loffs, TOUPPER(c));
			++loffs;
		}
	}
	return (TRUE);
}

/*
 * This routine figures out the bound of the region in the current window,
 * and stores the results into the fields of the REGION structure. Dot and
 * mark are usually close together, but I don't know the order, so I scan
 * outward from dot, in both directions, looking for mark. The size is kept
 * in a long. At the end, after the size is figured out, it is assigned to
 * the size field of the region structure. If this assignment loses any bits,
 * then we print an error. This is "type independent" overflow checking. All
 * of the callers of this routine should be ready to get an ABORT status,
 * because I might add a "if regions is big, ask before clobbering" flag.
 */
static int
getregion(struct region *rp)
{
	struct line	*flp, *blp;
	long	 fsize, bsize;

	if (curwp->w_markp == NULL) {
		dobeep();
		ewprintf("No mark set in this window");
		return (FALSE);
	}

	/* "r_size" always ok */
	if (curwp->w_dotp == curwp->w_markp) {
		rp->r_linep = curwp->w_dotp;
		rp->r_lineno = curwp->w_dotline;
		if (curwp->w_doto < curwp->w_marko) {
			rp->r_offset = curwp->w_doto;
			rp->r_size = (RSIZE)(curwp->w_marko - curwp->w_doto);
		} else {
			rp->r_offset = curwp->w_marko;
			rp->r_size = (RSIZE)(curwp->w_doto - curwp->w_marko);
		}
		return (TRUE);
	}
	/* get region size */
	flp = blp = curwp->w_dotp;
	bsize = curwp->w_doto;
	fsize = llength(flp) - curwp->w_doto + 1;
	while (lforw(flp) != curbp->b_headp || lback(blp) != curbp->b_headp) {
		if (lforw(flp) != curbp->b_headp) {
			flp = lforw(flp);
			if (flp == curwp->w_markp) {
				rp->r_linep = curwp->w_dotp;
				rp->r_offset = curwp->w_doto;
				rp->r_lineno = curwp->w_dotline;
				return (setsize(rp,
				    (RSIZE)(fsize + curwp->w_marko)));
			}
			fsize += llength(flp) + 1;
		}
		if (lback(blp) != curbp->b_headp) {
			blp = lback(blp);
			bsize += llength(blp) + 1;
			if (blp == curwp->w_markp) {
				rp->r_linep = blp;
				rp->r_offset = curwp->w_marko;
				rp->r_lineno = curwp->w_markline;
				return (setsize(rp,
				    (RSIZE)(bsize - curwp->w_marko)));
			}
		}
	}
	dobeep();
	ewprintf("Bug: lost mark");
	return (FALSE);
}

/*
 * Set size, and check for overflow.
 */
static int
setsize(struct region *rp, RSIZE size)
{
	rp->r_size = size;
	if (rp->r_size != size) {
		dobeep();
		ewprintf("Region is too large");
		return (FALSE);
	}
	return (TRUE);
}

#define PREFIXLENGTH 40
static char	prefix_string[PREFIXLENGTH] = {'>', '\0'};

/*
 * Prefix the region with whatever is in prefix_string.  Leaves dot at the
 * beginning of the line after the end of the region.  If an argument is
 * given, prompts for the line prefix string.
 */
/* ARGSUSED */
int
prefixregion(int f, int n)
{
	struct line	*first, *last;
	struct region	 region;
	char	*prefix = prefix_string;
	int	 nline;
	int	 s;

	if ((s = checkdirty(curbp)) != TRUE)
		return (s);
	if (curbp->b_flag & BFREADONLY) {
		dobeep();
		ewprintf("Buffer is read-only");
		return (FALSE);
	}
	if ((f == TRUE) && ((s = setprefix(FFRAND, 1)) != TRUE))
		return (s);

	/* get # of lines to affect */
	if ((s = getregion(&region)) != TRUE)
		return (s);
	first = region.r_linep;
	last = (first == curwp->w_dotp) ? curwp->w_markp : curwp->w_dotp;
	for (nline = 1; first != last; nline++)
		first = lforw(first);

	/* move to beginning of region */
	curwp->w_dotp = region.r_linep;
	curwp->w_doto = region.r_offset;
	curwp->w_dotline = region.r_lineno;

	/* for each line, go to beginning and insert the prefix string */
	while (nline--) {
		(void)gotobol(FFRAND, 1);
		for (prefix = prefix_string; *prefix; prefix++)
			(void)linsert(1, *prefix);
		(void)forwline(FFRAND, 1);
	}
	(void)gotobol(FFRAND, 1);
	return (TRUE);
}

/*
 * Set line prefix string. Used by prefixregion.
 */
/* ARGSUSED */
int
setprefix(int f, int n)
{
	char	buf[PREFIXLENGTH], *rep;
	int	retval;

	if (prefix_string[0] == '\0')
		rep = eread("Prefix string: ", buf, sizeof(buf),
		    EFNEW | EFCR);
	else
		rep = eread("Prefix string (default %s): ", buf, sizeof(buf),
		    EFNUL | EFNEW | EFCR, prefix_string);
	if (rep == NULL)
		return (ABORT);
	if (rep[0] != '\0') {
		(void)strlcpy(prefix_string, rep, sizeof(prefix_string));
		retval = TRUE;
	} else if (rep[0] == '\0' && prefix_string[0] != '\0') {
		/* CR -- use old one */
		retval = TRUE;
	} else
		retval = FALSE;
	return (retval);
}

int
region_get_data(struct region *reg, char *buf, int len)
{
	int	 i, off;
	struct line	*lp;

	off = reg->r_offset;
	lp = reg->r_linep;
	for (i = 0; i < len; i++) {
		if (off == llength(lp)) {
			lp = lforw(lp);
			if (lp == curbp->b_headp)
				break;
			off = 0;
			buf[i] = '\n';
		} else {
			buf[i] = lgetc(lp, off);
			off++;
		}
	}
	buf[i] = '\0';
	return (i);
}

void
region_put_data(const char *buf, int len)
{
	int i;

	for (i = 0; buf[i] != '\0' && i < len; i++) {
		if (buf[i] == '\n')
			lnewline();
		else
			linsert(1, buf[i]);
	}
}

/*
 * Mark whole buffer by first traversing to end-of-buffer
 * and then to beginning-of-buffer. Mark, dot are implicitly
 * set to eob, bob respectively during traversal.
 */
int
markbuffer(int f, int n)
{
	if (gotoeob(f,n) == FALSE)
		return (FALSE);
	if (gotobob(f,n) == FALSE)
		return (FALSE);
	return (TRUE);
}

/*
 * Pipe text from current region to external command.
 */
/*ARGSUSED */
int
piperegion(int f, int n)
{
	struct region region;
	int len;
	char *cmd, cmdbuf[NFILEN], *text;
	char *argv[] = {"sh", "-c", (char *) NULL, (char *) NULL};

	/* C-u M-| is not supported yet */
	if (n > 1)
		return (ABORT);

	if (curwp->w_markp == NULL) {
		dobeep();
		ewprintf("The mark is not set now, so there is no region");
		return (FALSE);
	}

	if ((cmd = eread("Shell command on region: ", cmdbuf, sizeof(cmdbuf),
	    EFNEW | EFCR)) == NULL || (cmd[0] == '\0'))
		return (ABORT);

	argv[2] = cmd;

	if (getregion(&region) != TRUE)
		return (FALSE);

	len = region.r_size;

	if ((text = malloc(len + 1)) == NULL) {
		dobeep();
		ewprintf("Cannot allocate memory.");
		return (FALSE);
	}

	region_get_data(&region, text, len);

	return shellcmdoutput(argv, text, len);
}

/*
 * Get command from mini-buffer and execute externally.
 */
/*ARGSUSED */
int
shellcommand(int f, int n)
{

	char *cmd, cmdbuf[NFILEN];
	char *argv[] = {"sh", "-c", (char *) NULL, (char *) NULL};

	if (n > 1)
		return (ABORT);

	if ((cmd = eread("Shell command: ", cmdbuf, sizeof(cmdbuf),
	    EFNEW | EFCR)) == NULL || (cmd[0] == '\0'))
		return (ABORT);

	argv[2] = cmd;

	return shellcmdoutput(argv, NULL, 0);
}


int
shellcmdoutput(char* const argv[], char* const text, int len)
{

	struct buffer *bp;
	char	*shellp;
	int	 ret;

	bp = bfind("*Shell Command Output*", TRUE);
	bp->b_flag |= BFREADONLY;
	if (bclear(bp) != TRUE) {
		free(text);
		return (FALSE);
	}

	shellp = getenv("SHELL");

	ret = pipeio(shellp, argv, text, len, bp);

	if (ret == TRUE) {
		eerase();
		if (lforw(bp->b_headp) == bp->b_headp)
			addline(bp, "(Shell command succeeded with no output)");
	}

	free(text);
	return (ret);
}

/*
 * Create a socketpair, fork and execv path with argv.
 * STDIN, STDOUT and STDERR of child process are redirected to socket.
 * Parent writes len chars from text to socket.
 */
int
pipeio(const char* const path, char* const argv[], char* const text, int len,
    struct buffer *outbp)
{
	int s[2], ret;
	char *err;
	pid_t pid;

	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, s) == -1) {
		dobeep();
		ewprintf("socketpair error");
		return (FALSE);
	}

	switch((pid = fork())) {
	case -1:
		dobeep();
		ewprintf("Can't fork");
		return (FALSE);
	case 0:
		/* Child process */
		close(s[0]);
		if (dup2(s[1], STDIN_FILENO) == -1)
			_exit(1);
		if (dup2(s[1], STDOUT_FILENO) == -1)
			_exit(1);
		if (dup2(s[1], STDERR_FILENO) == -1)
			_exit(1);
		if (path == NULL)
			_exit(1);

		execv(path, argv);
		err = strerror(errno);
		write(s[1], err, strlen(err));
		_exit(1);
	default:
		/* Parent process */
		close(s[1]);
		ret = iomux(s[0], text, len, outbp);
		waitpid(pid, NULL, 0); /* Collect child to prevent zombies */

		return (ret);
	}
	return (FALSE);
}

/*
 * Multiplex read, write on socket fd passed. Put output in outbp
 * Poll on the fd for both read and write readiness.
 */
int
iomux(int fd, char* const text, int len, struct buffer *outbp)
{
	struct pollfd pfd[1];
	int nfds;
	char *textcopy;

	textcopy = text;
	fcntl(fd, F_SETFL, O_NONBLOCK);
	pfd[0].fd = fd;

	/* There is nothing to write if len is zero
	 * but the cmd's output should be read so shutdown 
	 * the socket for writing only and don't wait for POLLOUT
	 */
	if (len == 0) {
		shutdown(fd, SHUT_WR);
		pfd[0].events = POLLIN;
	} else
		pfd[0].events = POLLIN | POLLOUT;

	while ((nfds = poll(pfd, 1, TIMEOUT)) != -1 ||
	    (pfd[0].revents & (POLLERR | POLLHUP | POLLNVAL))) {
		if (pfd[0].revents & POLLOUT && len > 0)
			pwriteout(fd, &textcopy, &len);
		else if (pfd[0].revents & POLLIN)
			if (preadin(fd, outbp) == FALSE)
				break;
		if (len == 0 && pfd[0].events & POLLOUT)
			pfd[0].events = POLLIN;
	}
	close(fd);

	/* In case if last line doesn't have a '\n' add the leftover 
	 * characters to buffer.
	 */
	if (leftover[0] != '\0') {
		addline(outbp, leftover);
		leftover[0] = '\0';
	}
	if (nfds == 0) {
		dobeep();
		ewprintf("poll timed out");
		return (FALSE);
	} else if (nfds == -1) {
		dobeep();
		ewprintf("poll error");
		return (FALSE);
	}
	return (popbuftop(outbp, WNONE));
}

/*
 * Write some text from region to fd. Once done shutdown the 
 * write end.
 */
void
pwriteout(int fd, char **text, int *len)
{
	int w;

/* As per: http://lists.apple.com/archives/macnetworkprog/2002/Dec/msg00091.html */
#ifdef __APPLE__
	if (((w = send(fd, *text, *len, SO_NOSIGPIPE)) == -1)) {
#else
	if (((w = send(fd, *text, *len, MSG_NOSIGNAL)) == -1)) {
#endif
		switch(errno) {
		case EPIPE:
			*len = -1;
			break;
		case EAGAIN:
			return;
		}
	} else
		*len -= w;

	*text += w;
	if (*len <= 0)
		shutdown(fd, SHUT_WR);		
}

/*
 * Read some data from socket fd, break on '\n' and add
 * to buffer. If couldn't break on newline hold leftover
 * characters and append in next iteration.
 */
int
preadin(int fd, struct buffer *bp)
{
	int len;
	char buf[BUFSIZ], *p, *q;

	if ((len = read(fd, buf, BUFSIZ - 1)) <= 0)
		return (FALSE);

	buf[len] = '\0';
	p = q = buf;
	if (leftover[0] != '\0' && ((q = strchr(p, '\n')) != NULL)) {
		*q++ = '\0';
		if (strlcat(leftover, p, sizeof(leftover)) >=
		    sizeof(leftover)) {
			dobeep();
			ewprintf("line too long");
			return (FALSE);
		}
		addline(bp, leftover);
		leftover[0] = '\0';
		p = q;
	}
	while ((q = strchr(p, '\n')) != NULL) {
		*q++ = '\0';
		addline(bp, p);
		p = q;
	}
	if (strlcpy(leftover, p, sizeof(leftover)) >= sizeof(leftover)) {
		dobeep();
		ewprintf("line too long");
		return (FALSE);
	}
	return (TRUE);
}