xref: /freebsd/bin/df/df.c (revision 273c26a3c3bea87a241d6879abd4f991db180bf0)
1 /*-
2  * Copyright (c) 1980, 1990, 1993, 1994
3  *	The Regents of the University of California.  All rights reserved.
4  * (c) UNIX System Laboratories, Inc.
5  * All or some portions of this file are derived from material licensed
6  * to the University of California by American Telephone and Telegraph
7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8  * the permission of UNIX System Laboratories, Inc.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 4. Neither the name of the University nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  */
34 
35 #if 0
36 #ifndef lint
37 static const char copyright[] =
38 "@(#) Copyright (c) 1980, 1990, 1993, 1994\n\
39 	The Regents of the University of California.  All rights reserved.\n";
40 #endif /* not lint */
41 
42 #ifndef lint
43 static char sccsid[] = "@(#)df.c	8.9 (Berkeley) 5/8/95";
44 #endif /* not lint */
45 #endif
46 #include <sys/cdefs.h>
47 __FBSDID("$FreeBSD$");
48 
49 #include <sys/param.h>
50 #include <sys/stat.h>
51 #include <sys/mount.h>
52 #include <sys/sysctl.h>
53 #include <ufs/ufs/ufsmount.h>
54 #include <err.h>
55 #include <libutil.h>
56 #include <locale.h>
57 #include <stdint.h>
58 #include <stdio.h>
59 #include <stdlib.h>
60 #include <string.h>
61 #include <sysexits.h>
62 #include <unistd.h>
63 #include <libxo/xo.h>
64 
65 #include "extern.h"
66 
67 #define UNITS_SI	1
68 #define UNITS_2		2
69 
70 /* Maximum widths of various fields. */
71 struct maxwidths {
72 	int	mntfrom;
73 	int	fstype;
74 	int	total;
75 	int	used;
76 	int	avail;
77 	int	iused;
78 	int	ifree;
79 };
80 
81 static void	  addstat(struct statfs *, struct statfs *);
82 static char	 *getmntpt(const char *);
83 static int	  int64width(int64_t);
84 static char	 *makenetvfslist(void);
85 static void	  prthuman(const struct statfs *, int64_t);
86 static void	  prthumanval(const char *, int64_t);
87 static intmax_t	  fsbtoblk(int64_t, uint64_t, u_long);
88 static void	  prtstat(struct statfs *, struct maxwidths *);
89 static size_t	  regetmntinfo(struct statfs **, long, const char **);
90 static void	  update_maxwidths(struct maxwidths *, const struct statfs *);
91 static void	  usage(void);
92 
93 static __inline int
94 imax(int a, int b)
95 {
96 	return (a > b ? a : b);
97 }
98 
99 static int	aflag = 0, cflag, hflag, iflag, kflag, lflag = 0, nflag, Tflag;
100 static int	thousands;
101 static struct	ufs_args mdev;
102 
103 int
104 main(int argc, char *argv[])
105 {
106 	struct stat stbuf;
107 	struct statfs statfsbuf, totalbuf;
108 	struct maxwidths maxwidths;
109 	struct statfs *mntbuf;
110 	const char *fstype;
111 	char *mntpath, *mntpt;
112 	const char **vfslist;
113 	int i, mntsize;
114 	int ch, rv;
115 
116 	fstype = "ufs";
117 	(void)setlocale(LC_ALL, "");
118 	memset(&maxwidths, 0, sizeof(maxwidths));
119 	memset(&totalbuf, 0, sizeof(totalbuf));
120 	totalbuf.f_bsize = DEV_BSIZE;
121 	strlcpy(totalbuf.f_mntfromname, "total", MNAMELEN);
122 	vfslist = NULL;
123 
124 	argc = xo_parse_args(argc, argv);
125 	if (argc < 0)
126 		exit(1);
127 
128 	while ((ch = getopt(argc, argv, "abcgHhiklmnPt:T,")) != -1)
129 		switch (ch) {
130 		case 'a':
131 			aflag = 1;
132 			break;
133 		case 'b':
134 				/* FALLTHROUGH */
135 		case 'P':
136 			/*
137 			 * POSIX specifically discusses the behavior of
138 			 * both -k and -P. It states that the blocksize should
139 			 * be set to 1024. Thus, if this occurs, simply break
140 			 * rather than clobbering the old blocksize.
141 			 */
142 			if (kflag)
143 				break;
144 			setenv("BLOCKSIZE", "512", 1);
145 			hflag = 0;
146 			break;
147 		case 'c':
148 			cflag = 1;
149 			break;
150 		case 'g':
151 			setenv("BLOCKSIZE", "1g", 1);
152 			hflag = 0;
153 			break;
154 		case 'H':
155 			hflag = UNITS_SI;
156 			break;
157 		case 'h':
158 			hflag = UNITS_2;
159 			break;
160 		case 'i':
161 			iflag = 1;
162 			break;
163 		case 'k':
164 			kflag++;
165 			setenv("BLOCKSIZE", "1024", 1);
166 			hflag = 0;
167 			break;
168 		case 'l':
169 			/* Ignore duplicate -l */
170 			if (lflag)
171 				break;
172 			if (vfslist != NULL)
173 				xo_errx(1, "-l and -t are mutually exclusive.");
174 			vfslist = makevfslist(makenetvfslist());
175 			lflag = 1;
176 			break;
177 		case 'm':
178 			setenv("BLOCKSIZE", "1m", 1);
179 			hflag = 0;
180 			break;
181 		case 'n':
182 			nflag = 1;
183 			break;
184 		case 't':
185 			if (lflag)
186 				xo_errx(1, "-l and -t are mutually exclusive.");
187 			if (vfslist != NULL)
188 				xo_errx(1, "only one -t option may be specified");
189 			fstype = optarg;
190 			vfslist = makevfslist(optarg);
191 			break;
192 		case 'T':
193 			Tflag = 1;
194 			break;
195 		case ',':
196 			thousands = 1;
197 			break;
198 		case '?':
199 		default:
200 			usage();
201 		}
202 	argc -= optind;
203 	argv += optind;
204 
205 	rv = 0;
206 	if (!*argv) {
207 		/* everything (modulo -t) */
208 		mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
209 		mntsize = regetmntinfo(&mntbuf, mntsize, vfslist);
210 	} else {
211 		/* just the filesystems specified on the command line */
212 		mntbuf = malloc(argc * sizeof(*mntbuf));
213 		if (mntbuf == NULL)
214 			xo_err(1, "malloc()");
215 		mntsize = 0;
216 		/* continued in for loop below */
217 	}
218 
219 	xo_open_container("storage-system-information");
220 	xo_open_list("filesystem");
221 
222 	/* iterate through specified filesystems */
223 	for (; *argv; argv++) {
224 		if (stat(*argv, &stbuf) < 0) {
225 			if ((mntpt = getmntpt(*argv)) == NULL) {
226 				xo_warn("%s", *argv);
227 				rv = 1;
228 				continue;
229 			}
230 		} else if (S_ISCHR(stbuf.st_mode)) {
231 			if ((mntpt = getmntpt(*argv)) == NULL) {
232 				mdev.fspec = *argv;
233 				mntpath = strdup("/tmp/df.XXXXXX");
234 				if (mntpath == NULL) {
235 					xo_warn("strdup failed");
236 					rv = 1;
237 					continue;
238 				}
239 				mntpt = mkdtemp(mntpath);
240 				if (mntpt == NULL) {
241 					xo_warn("mkdtemp(\"%s\") failed", mntpath);
242 					rv = 1;
243 					free(mntpath);
244 					continue;
245 				}
246 				if (mount(fstype, mntpt, MNT_RDONLY,
247 				    &mdev) != 0) {
248 					xo_warn("%s", *argv);
249 					rv = 1;
250 					(void)rmdir(mntpt);
251 					free(mntpath);
252 					continue;
253 				} else if (statfs(mntpt, &statfsbuf) == 0) {
254 					statfsbuf.f_mntonname[0] = '\0';
255 					prtstat(&statfsbuf, &maxwidths);
256 					if (cflag)
257 						addstat(&totalbuf, &statfsbuf);
258 				} else {
259 					xo_warn("%s", *argv);
260 					rv = 1;
261 				}
262 				(void)unmount(mntpt, 0);
263 				(void)rmdir(mntpt);
264 				free(mntpath);
265 				continue;
266 			}
267 		} else
268 			mntpt = *argv;
269 
270 		/*
271 		 * Statfs does not take a `wait' flag, so we cannot
272 		 * implement nflag here.
273 		 */
274 		if (statfs(mntpt, &statfsbuf) < 0) {
275 			xo_warn("%s", mntpt);
276 			rv = 1;
277 			continue;
278 		}
279 
280 		/*
281 		 * Check to make sure the arguments we've been given are
282 		 * satisfied.  Return an error if we have been asked to
283 		 * list a mount point that does not match the other args
284 		 * we've been given (-l, -t, etc.).
285 		 */
286 		if (checkvfsname(statfsbuf.f_fstypename, vfslist)) {
287 			rv = 1;
288 			continue;
289 		}
290 
291 		/* the user asked for it, so ignore the ignore flag */
292 		statfsbuf.f_flags &= ~MNT_IGNORE;
293 
294 		/* add to list */
295 		mntbuf[mntsize++] = statfsbuf;
296 	}
297 
298 	memset(&maxwidths, 0, sizeof(maxwidths));
299 	for (i = 0; i < mntsize; i++) {
300 		if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0) {
301 			update_maxwidths(&maxwidths, &mntbuf[i]);
302 			if (cflag)
303 				addstat(&totalbuf, &mntbuf[i]);
304 		}
305 	}
306 	for (i = 0; i < mntsize; i++)
307 		if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0)
308 			prtstat(&mntbuf[i], &maxwidths);
309 
310 	xo_close_list("filesystem");
311 
312 	if (cflag)
313 		prtstat(&totalbuf, &maxwidths);
314 
315 	xo_close_container("storage-system-information");
316 	xo_finish();
317 	exit(rv);
318 }
319 
320 static char *
321 getmntpt(const char *name)
322 {
323 	size_t mntsize, i;
324 	struct statfs *mntbuf;
325 
326 	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
327 	for (i = 0; i < mntsize; i++) {
328 		if (!strcmp(mntbuf[i].f_mntfromname, name))
329 			return (mntbuf[i].f_mntonname);
330 	}
331 	return (NULL);
332 }
333 
334 /*
335  * Make a pass over the file system info in ``mntbuf'' filtering out
336  * file system types not in vfslist and possibly re-stating to get
337  * current (not cached) info.  Returns the new count of valid statfs bufs.
338  */
339 static size_t
340 regetmntinfo(struct statfs **mntbufp, long mntsize, const char **vfslist)
341 {
342 	int error, i, j;
343 	struct statfs *mntbuf;
344 
345 	if (vfslist == NULL)
346 		return (nflag ? mntsize : getmntinfo(mntbufp, MNT_WAIT));
347 
348 	mntbuf = *mntbufp;
349 	for (j = 0, i = 0; i < mntsize; i++) {
350 		if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
351 			continue;
352 		/*
353 		 * XXX statfs(2) can fail for various reasons. It may be
354 		 * possible that the user does not have access to the
355 		 * pathname, if this happens, we will fall back on
356 		 * "stale" filesystem statistics.
357 		 */
358 		error = statfs(mntbuf[i].f_mntonname, &mntbuf[j]);
359 		if (nflag || error < 0)
360 			if (i != j) {
361 				if (error < 0)
362 					xo_warnx("%s stats possibly stale",
363 					    mntbuf[i].f_mntonname);
364 				mntbuf[j] = mntbuf[i];
365 			}
366 		j++;
367 	}
368 	return (j);
369 }
370 
371 static void
372 prthuman(const struct statfs *sfsp, int64_t used)
373 {
374 
375 	prthumanval("  {:blocks/%6s}", sfsp->f_blocks * sfsp->f_bsize);
376 	prthumanval("  {:used/%6s}", used * sfsp->f_bsize);
377 	prthumanval("  {:available/%6s}", sfsp->f_bavail * sfsp->f_bsize);
378 }
379 
380 static void
381 prthumanval(const char *fmt, int64_t bytes)
382 {
383 	char buf[6];
384 	int flags;
385 
386 	flags = HN_B | HN_NOSPACE | HN_DECIMAL;
387 	if (hflag == UNITS_SI)
388 		flags |= HN_DIVISOR_1000;
389 
390 	humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
391 	    bytes, "", HN_AUTOSCALE, flags);
392 
393 	xo_attr("value", "%lld", (long long) bytes);
394 	xo_emit(fmt, buf);
395 }
396 
397 /*
398  * Print an inode count in "human-readable" format.
399  */
400 static void
401 prthumanvalinode(const char *fmt, int64_t bytes)
402 {
403 	char buf[6];
404 	int flags;
405 
406 	flags = HN_NOSPACE | HN_DECIMAL | HN_DIVISOR_1000;
407 
408 	humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
409 	    bytes, "", HN_AUTOSCALE, flags);
410 
411 	xo_attr("value", "%lld", (long long) bytes);
412 	xo_emit(fmt, buf);
413 }
414 
415 /*
416  * Convert statfs returned file system size into BLOCKSIZE units.
417  */
418 static intmax_t
419 fsbtoblk(int64_t num, uint64_t fsbs, u_long bs)
420 {
421 	return (num * (intmax_t) fsbs / (int64_t) bs);
422 }
423 
424 /*
425  * Print out status about a file system.
426  */
427 static void
428 prtstat(struct statfs *sfsp, struct maxwidths *mwp)
429 {
430 	static long blocksize;
431 	static int headerlen, timesthrough = 0;
432 	static const char *header;
433 	int64_t used, availblks, inodes;
434 	const char *format;
435 
436 	if (++timesthrough == 1) {
437 		mwp->mntfrom = imax(mwp->mntfrom, (int)strlen("Filesystem"));
438 		mwp->fstype = imax(mwp->fstype, (int)strlen("Type"));
439 		if (thousands) {		/* make space for commas */
440 		    mwp->total += (mwp->total - 1) / 3;
441 		    mwp->used  += (mwp->used - 1) / 3;
442 		    mwp->avail += (mwp->avail - 1) / 3;
443 		    mwp->iused += (mwp->iused - 1) / 3;
444 		    mwp->ifree += (mwp->ifree - 1) / 3;
445 		}
446 		if (hflag) {
447 			header = "   Size";
448 			mwp->total = mwp->used = mwp->avail =
449 			    (int)strlen(header);
450 		} else {
451 			header = getbsize(&headerlen, &blocksize);
452 			mwp->total = imax(mwp->total, headerlen);
453 		}
454 		mwp->used = imax(mwp->used, (int)strlen("Used"));
455 		mwp->avail = imax(mwp->avail, (int)strlen("Avail"));
456 
457 		xo_emit("{T:/%-*s}", mwp->mntfrom, "Filesystem");
458 		if (Tflag)
459 			xo_emit("  {T:/%-*s}", mwp->fstype, "Type");
460 		xo_emit(" {T:/%*s} {T:/%*s} {T:/%*s} Capacity",
461 			mwp->total, header,
462 			mwp->used, "Used", mwp->avail, "Avail");
463 		if (iflag) {
464 			mwp->iused = imax(hflag ? 0 : mwp->iused,
465 			    (int)strlen("  iused"));
466 			mwp->ifree = imax(hflag ? 0 : mwp->ifree,
467 			    (int)strlen("ifree"));
468 			xo_emit(" {T:/%*s} {T:/%*s} {T:\%iused}",
469 			    mwp->iused - 2, "iused", mwp->ifree, "ifree");
470 		}
471 		xo_emit("  {T:Mounted on}\n");
472 	}
473 
474 	xo_open_instance("filesystem");
475 	/* Check for 0 block size.  Can this happen? */
476 	if (sfsp->f_bsize == 0) {
477 		xo_warnx ("File system %s does not have a block size, assuming 512.",
478 		    sfsp->f_mntonname);
479 		sfsp->f_bsize = 512;
480 	}
481 	xo_emit("{tk:name/%-*s}", mwp->mntfrom, sfsp->f_mntfromname);
482 	if (Tflag)
483 		xo_emit("  {:type/%-*s}", mwp->fstype, sfsp->f_fstypename);
484 	used = sfsp->f_blocks - sfsp->f_bfree;
485 	availblks = sfsp->f_bavail + used;
486 	if (hflag) {
487 		prthuman(sfsp, used);
488 	} else {
489 		if (thousands)
490 		    format = " {t:total-blocks/%*j'd} {t:used-blocks/%*j'd} "
491 			"{t:available-blocks/%*j'd}";
492 		else
493 		    format = " {t:total-blocks/%*jd} {t:used-blocks/%*jd} "
494 			"{t:available-blocks/%*jd}";
495 		xo_emit(format,
496 		    mwp->total, fsbtoblk(sfsp->f_blocks,
497 		    sfsp->f_bsize, blocksize),
498 		    mwp->used, fsbtoblk(used, sfsp->f_bsize, blocksize),
499 		    mwp->avail, fsbtoblk(sfsp->f_bavail,
500 		    sfsp->f_bsize, blocksize));
501 	}
502 	xo_emit(" {:used-percent/%5.0f}{U:%%}",
503 	    availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
504 	if (iflag) {
505 		inodes = sfsp->f_files;
506 		used = inodes - sfsp->f_ffree;
507 		if (hflag) {
508 			xo_emit("  ");
509 			prthumanvalinode(" {:inodes-used/%5s}", used);
510 			prthumanvalinode(" {:inodes-free/%5s}", sfsp->f_ffree);
511 		} else {
512 			if (thousands)
513 			    format = " {:inodes-used/%*j'd} {:inodes-free/%*j'd}";
514 			else
515 			    format = " {:inodes-used/%*jd} {:inodes-free/%*jd}";
516 			xo_emit(format, mwp->iused, (intmax_t)used,
517 			    mwp->ifree, (intmax_t)sfsp->f_ffree);
518 		}
519 		xo_emit(" {:inodes-used-percent/%4.0f}{U:%%} ",
520 			inodes == 0 ? 100.0 :
521 			(double)used / (double)inodes * 100.0);
522 	} else
523 		xo_emit("  ");
524 	if (strncmp(sfsp->f_mntfromname, "total", MNAMELEN) != 0)
525 		xo_emit("  {:mounted-on}", sfsp->f_mntonname);
526 	xo_emit("\n");
527 	xo_close_instance("filesystem");
528 }
529 
530 static void
531 addstat(struct statfs *totalfsp, struct statfs *statfsp)
532 {
533 	uint64_t bsize;
534 
535 	bsize = statfsp->f_bsize / totalfsp->f_bsize;
536 	totalfsp->f_blocks += statfsp->f_blocks * bsize;
537 	totalfsp->f_bfree += statfsp->f_bfree * bsize;
538 	totalfsp->f_bavail += statfsp->f_bavail * bsize;
539 	totalfsp->f_files += statfsp->f_files;
540 	totalfsp->f_ffree += statfsp->f_ffree;
541 }
542 
543 /*
544  * Update the maximum field-width information in `mwp' based on
545  * the file system specified by `sfsp'.
546  */
547 static void
548 update_maxwidths(struct maxwidths *mwp, const struct statfs *sfsp)
549 {
550 	static long blocksize = 0;
551 	int dummy;
552 
553 	if (blocksize == 0)
554 		getbsize(&dummy, &blocksize);
555 
556 	mwp->mntfrom = imax(mwp->mntfrom, (int)strlen(sfsp->f_mntfromname));
557 	mwp->fstype = imax(mwp->fstype, (int)strlen(sfsp->f_fstypename));
558 	mwp->total = imax(mwp->total, int64width(
559 	    fsbtoblk((int64_t)sfsp->f_blocks, sfsp->f_bsize, blocksize)));
560 	mwp->used = imax(mwp->used,
561 	    int64width(fsbtoblk((int64_t)sfsp->f_blocks -
562 	    (int64_t)sfsp->f_bfree, sfsp->f_bsize, blocksize)));
563 	mwp->avail = imax(mwp->avail, int64width(fsbtoblk(sfsp->f_bavail,
564 	    sfsp->f_bsize, blocksize)));
565 	mwp->iused = imax(mwp->iused, int64width((int64_t)sfsp->f_files -
566 	    sfsp->f_ffree));
567 	mwp->ifree = imax(mwp->ifree, int64width(sfsp->f_ffree));
568 }
569 
570 /* Return the width in characters of the specified value. */
571 static int
572 int64width(int64_t val)
573 {
574 	int len;
575 
576 	len = 0;
577 	/* Negative or zero values require one extra digit. */
578 	if (val <= 0) {
579 		val = -val;
580 		len++;
581 	}
582 	while (val > 0) {
583 		len++;
584 		val /= 10;
585 	}
586 
587 	return (len);
588 }
589 
590 static void
591 usage(void)
592 {
593 
594 	xo_error(
595 "usage: df [-b | -g | -H | -h | -k | -m | -P] [-acilnT] [-t type] [-,]\n"
596 "          [file | filesystem ...]\n");
597 	exit(EX_USAGE);
598 }
599 
600 static char *
601 makenetvfslist(void)
602 {
603 	char *str, *strptr, **listptr;
604 	struct xvfsconf *xvfsp, *keep_xvfsp;
605 	size_t buflen;
606 	int cnt, i, maxvfsconf;
607 
608 	if (sysctlbyname("vfs.conflist", NULL, &buflen, NULL, 0) < 0) {
609 		xo_warn("sysctl(vfs.conflist)");
610 		return (NULL);
611 	}
612 	xvfsp = malloc(buflen);
613 	if (xvfsp == NULL) {
614 		xo_warnx("malloc failed");
615 		return (NULL);
616 	}
617 	keep_xvfsp = xvfsp;
618 	if (sysctlbyname("vfs.conflist", xvfsp, &buflen, NULL, 0) < 0) {
619 		xo_warn("sysctl(vfs.conflist)");
620 		free(keep_xvfsp);
621 		return (NULL);
622 	}
623 	maxvfsconf = buflen / sizeof(struct xvfsconf);
624 
625 	if ((listptr = malloc(sizeof(char*) * maxvfsconf)) == NULL) {
626 		xo_warnx("malloc failed");
627 		free(keep_xvfsp);
628 		return (NULL);
629 	}
630 
631 	for (cnt = 0, i = 0; i < maxvfsconf; i++) {
632 		if (xvfsp->vfc_flags & VFCF_NETWORK) {
633 			listptr[cnt++] = strdup(xvfsp->vfc_name);
634 			if (listptr[cnt-1] == NULL) {
635 				xo_warnx("malloc failed");
636 				free(listptr);
637 				free(keep_xvfsp);
638 				return (NULL);
639 			}
640 		}
641 		xvfsp++;
642 	}
643 
644 	if (cnt == 0 ||
645 	    (str = malloc(sizeof(char) * (32 * cnt + cnt + 2))) == NULL) {
646 		if (cnt > 0)
647 			xo_warnx("malloc failed");
648 		free(listptr);
649 		free(keep_xvfsp);
650 		return (NULL);
651 	}
652 
653 	*str = 'n'; *(str + 1) = 'o';
654 	for (i = 0, strptr = str + 2; i < cnt; i++, strptr++) {
655 		strlcpy(strptr, listptr[i], 32);
656 		strptr += strlen(listptr[i]);
657 		*strptr = ',';
658 		free(listptr[i]);
659 	}
660 	*(--strptr) = '\0';
661 
662 	free(keep_xvfsp);
663 	free(listptr);
664 	return (str);
665 }
666