1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1990, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF 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#if 0
38#ifndef lint
39static const char copyright[] =
40"@(#) Copyright (c) 1980, 1990, 1993, 1994\n\
41	The Regents of the University of California.  All rights reserved.\n";
42#endif /* not lint */
43
44#ifndef lint
45static char sccsid[] = "@(#)df.c	8.9 (Berkeley) 5/8/95";
46#endif /* not lint */
47#endif
48#include <sys/cdefs.h>
49__FBSDID("$FreeBSD$");
50
51#include <sys/param.h>
52#include <sys/stat.h>
53#include <sys/mount.h>
54#include <sys/sysctl.h>
55#ifdef MOUNT_CHAR_DEVS
56#include <ufs/ufs/ufsmount.h>
57#endif
58#include <err.h>
59#include <getopt.h>
60#include <libutil.h>
61#include <locale.h>
62#ifdef MOUNT_CHAR_DEVS
63#include <mntopts.h>
64#endif
65#include <stdint.h>
66#include <stdio.h>
67#include <stdlib.h>
68#include <string.h>
69#include <sysexits.h>
70#include <unistd.h>
71#include <libxo/xo.h>
72
73#include "extern.h"
74
75#define UNITS_SI	1
76#define UNITS_2		2
77
78/* Maximum widths of various fields. */
79struct maxwidths {
80	int	mntfrom;
81	int	fstype;
82	int	total;
83	int	used;
84	int	avail;
85	int	iused;
86	int	ifree;
87};
88
89static void	  addstat(struct statfs *, struct statfs *);
90static char	 *getmntpt(const char *);
91static int	  int64width(int64_t);
92static char	 *makenetvfslist(void);
93static void	  prthuman(const struct statfs *, int64_t);
94static void	  prthumanval(const char *, int64_t);
95static intmax_t	  fsbtoblk(int64_t, uint64_t, u_long);
96static void	  prtstat(struct statfs *, struct maxwidths *);
97static size_t	  regetmntinfo(struct statfs **, long, const char **);
98static void	  update_maxwidths(struct maxwidths *, const struct statfs *);
99static void	  usage(void);
100
101static __inline int
102imax(int a, int b)
103{
104	return (a > b ? a : b);
105}
106
107static int	aflag = 0, cflag, hflag, iflag, kflag, lflag = 0, nflag, Tflag;
108static int	thousands;
109#ifdef MOUNT_CHAR_DEVS
110static struct	ufs_args mdev;
111#endif
112
113static const struct option long_options[] =
114{
115	{ "si", no_argument, NULL, 'H' },
116	{ NULL, no_argument, NULL, 0 },
117};
118
119int
120main(int argc, char *argv[])
121{
122	struct stat stbuf;
123	struct statfs statfsbuf, totalbuf;
124	struct maxwidths maxwidths;
125	struct statfs *mntbuf;
126#ifdef MOUNT_CHAR_DEVS
127	struct iovec *iov = NULL;
128#endif
129	const char *fstype;
130#ifdef MOUNT_CHAR_DEVS
131	char *mntpath;
132	char errmsg[255] = {0};
133#endif
134	char *mntpt;
135	const char **vfslist;
136	int i, mntsize;
137	int ch, rv;
138#ifdef MOUNT_CHAR_DEVS
139	int iovlen = 0;
140#endif
141
142	fstype = "ufs";
143	(void)setlocale(LC_ALL, "");
144	memset(&maxwidths, 0, sizeof(maxwidths));
145	memset(&totalbuf, 0, sizeof(totalbuf));
146	totalbuf.f_bsize = DEV_BSIZE;
147	strlcpy(totalbuf.f_mntfromname, "total", MNAMELEN);
148	vfslist = NULL;
149
150	argc = xo_parse_args(argc, argv);
151	if (argc < 0)
152		exit(1);
153
154	while ((ch = getopt_long(argc, argv, "+abcgHhiklmnPt:T,", long_options,
155	    NULL)) != -1)
156		switch (ch) {
157		case 'a':
158			aflag = 1;
159			break;
160		case 'b':
161				/* FALLTHROUGH */
162		case 'P':
163			/*
164			 * POSIX specifically discusses the behavior of
165			 * both -k and -P. It states that the blocksize should
166			 * be set to 1024. Thus, if this occurs, simply break
167			 * rather than clobbering the old blocksize.
168			 */
169			if (kflag)
170				break;
171			setenv("BLOCKSIZE", "512", 1);
172			hflag = 0;
173			break;
174		case 'c':
175			cflag = 1;
176			break;
177		case 'g':
178			setenv("BLOCKSIZE", "1g", 1);
179			hflag = 0;
180			break;
181		case 'H':
182			hflag = UNITS_SI;
183			break;
184		case 'h':
185			hflag = UNITS_2;
186			break;
187		case 'i':
188			iflag = 1;
189			break;
190		case 'k':
191			kflag++;
192			setenv("BLOCKSIZE", "1024", 1);
193			hflag = 0;
194			break;
195		case 'l':
196			/* Ignore duplicate -l */
197			if (lflag)
198				break;
199			if (vfslist != NULL)
200				xo_errx(1, "-l and -t are mutually exclusive.");
201			vfslist = makevfslist(makenetvfslist());
202			lflag = 1;
203			break;
204		case 'm':
205			setenv("BLOCKSIZE", "1m", 1);
206			hflag = 0;
207			break;
208		case 'n':
209			nflag = 1;
210			break;
211		case 't':
212			if (lflag)
213				xo_errx(1, "-l and -t are mutually exclusive.");
214			if (vfslist != NULL)
215				xo_errx(1, "only one -t option may be specified");
216			fstype = optarg;
217			vfslist = makevfslist(optarg);
218			break;
219		case 'T':
220			Tflag = 1;
221			break;
222		case ',':
223			thousands = 1;
224			break;
225		case '?':
226		default:
227			usage();
228		}
229	argc -= optind;
230	argv += optind;
231
232	rv = 0;
233	if (!*argv) {
234		/* everything (modulo -t) */
235		mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
236		mntsize = regetmntinfo(&mntbuf, mntsize, vfslist);
237	} else {
238		/* just the filesystems specified on the command line */
239		mntbuf = malloc(argc * sizeof(*mntbuf));
240		if (mntbuf == NULL)
241			xo_err(1, "malloc()");
242		mntsize = 0;
243		/* continued in for loop below */
244	}
245
246	xo_open_container("storage-system-information");
247	xo_open_list("filesystem");
248
249	/* iterate through specified filesystems */
250	for (; *argv; argv++) {
251		if (stat(*argv, &stbuf) < 0) {
252			if ((mntpt = getmntpt(*argv)) == NULL) {
253				xo_warn("%s", *argv);
254				rv = 1;
255				continue;
256			}
257		} else if (S_ISCHR(stbuf.st_mode)) {
258			if ((mntpt = getmntpt(*argv)) == NULL) {
259#ifdef MOUNT_CHAR_DEVS
260				xo_warnx(
261				    "df on unmounted devices is deprecated");
262				mdev.fspec = *argv;
263				mntpath = strdup("/tmp/df.XXXXXX");
264				if (mntpath == NULL) {
265					xo_warn("strdup failed");
266					rv = 1;
267					continue;
268				}
269				mntpt = mkdtemp(mntpath);
270				if (mntpt == NULL) {
271					xo_warn("mkdtemp(\"%s\") failed", mntpath);
272					rv = 1;
273					free(mntpath);
274					continue;
275				}
276				if (iov != NULL)
277					free_iovec(&iov, &iovlen);
278				build_iovec_argf(&iov, &iovlen, "fstype", "%s",
279				    fstype);
280				build_iovec_argf(&iov, &iovlen, "fspath", "%s",
281				    mntpath);
282				build_iovec_argf(&iov, &iovlen, "from", "%s",
283				    *argv);
284				build_iovec(&iov, &iovlen, "errmsg", errmsg,
285				    sizeof(errmsg));
286				if (nmount(iov, iovlen,
287				    MNT_RDONLY|MNT_NOEXEC) < 0) {
288					if (errmsg[0])
289						xo_warn("%s: %s", *argv,
290						    errmsg);
291					else
292						xo_warn("%s", *argv);
293					rv = 1;
294					(void)rmdir(mntpt);
295					free(mntpath);
296					continue;
297				} else if (statfs(mntpt, &statfsbuf) == 0) {
298					statfsbuf.f_mntonname[0] = '\0';
299					prtstat(&statfsbuf, &maxwidths);
300					if (cflag)
301						addstat(&totalbuf, &statfsbuf);
302				} else {
303					xo_warn("%s", *argv);
304					rv = 1;
305				}
306				(void)unmount(mntpt, 0);
307				(void)rmdir(mntpt);
308				free(mntpath);
309				continue;
310#else
311				xo_warnx("%s: not mounted", *argv);
312				rv = 1;
313				continue;
314#endif
315			}
316		} else
317			mntpt = *argv;
318
319		/*
320		 * Statfs does not take a `wait' flag, so we cannot
321		 * implement nflag here.
322		 */
323		if (statfs(mntpt, &statfsbuf) < 0) {
324			xo_warn("%s", mntpt);
325			rv = 1;
326			continue;
327		}
328
329		/*
330		 * Check to make sure the arguments we've been given are
331		 * satisfied.  Return an error if we have been asked to
332		 * list a mount point that does not match the other args
333		 * we've been given (-l, -t, etc.).
334		 */
335		if (checkvfsname(statfsbuf.f_fstypename, vfslist)) {
336			rv = 1;
337			continue;
338		}
339
340		/* the user asked for it, so ignore the ignore flag */
341		statfsbuf.f_flags &= ~MNT_IGNORE;
342
343		/* add to list */
344		mntbuf[mntsize++] = statfsbuf;
345	}
346
347	memset(&maxwidths, 0, sizeof(maxwidths));
348	for (i = 0; i < mntsize; i++) {
349		if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0) {
350			update_maxwidths(&maxwidths, &mntbuf[i]);
351			if (cflag)
352				addstat(&totalbuf, &mntbuf[i]);
353		}
354	}
355	for (i = 0; i < mntsize; i++)
356		if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0)
357			prtstat(&mntbuf[i], &maxwidths);
358
359	xo_close_list("filesystem");
360
361	if (cflag)
362		prtstat(&totalbuf, &maxwidths);
363
364	xo_close_container("storage-system-information");
365	xo_finish();
366	exit(rv);
367}
368
369static char *
370getmntpt(const char *name)
371{
372	size_t mntsize, i;
373	struct statfs *mntbuf;
374
375	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
376	for (i = 0; i < mntsize; i++) {
377		if (!strcmp(mntbuf[i].f_mntfromname, name))
378			return (mntbuf[i].f_mntonname);
379	}
380	return (NULL);
381}
382
383/*
384 * Make a pass over the file system info in ``mntbuf'' filtering out
385 * file system types not in vfslist and possibly re-stating to get
386 * current (not cached) info.  Returns the new count of valid statfs bufs.
387 */
388static size_t
389regetmntinfo(struct statfs **mntbufp, long mntsize, const char **vfslist)
390{
391	int error, i, j;
392	struct statfs *mntbuf;
393
394	if (vfslist == NULL)
395		return (nflag ? mntsize : getmntinfo(mntbufp, MNT_WAIT));
396
397	mntbuf = *mntbufp;
398	for (j = 0, i = 0; i < mntsize; i++) {
399		if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
400			continue;
401		/*
402		 * XXX statfs(2) can fail for various reasons. It may be
403		 * possible that the user does not have access to the
404		 * pathname, if this happens, we will fall back on
405		 * "stale" filesystem statistics.
406		 */
407		error = statfs(mntbuf[i].f_mntonname, &mntbuf[j]);
408		if (nflag || error < 0)
409			if (i != j) {
410				if (error < 0)
411					xo_warnx("%s stats possibly stale",
412					    mntbuf[i].f_mntonname);
413				mntbuf[j] = mntbuf[i];
414			}
415		j++;
416	}
417	return (j);
418}
419
420static void
421prthuman(const struct statfs *sfsp, int64_t used)
422{
423
424	prthumanval("  {:blocks/%6s}", sfsp->f_blocks * sfsp->f_bsize);
425	prthumanval("  {:used/%6s}", used * sfsp->f_bsize);
426	prthumanval("  {:available/%6s}", sfsp->f_bavail * sfsp->f_bsize);
427}
428
429static void
430prthumanval(const char *fmt, int64_t bytes)
431{
432	char buf[6];
433	int flags;
434
435	flags = HN_B | HN_NOSPACE | HN_DECIMAL;
436	if (hflag == UNITS_SI)
437		flags |= HN_DIVISOR_1000;
438
439	humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
440	    bytes, "", HN_AUTOSCALE, flags);
441
442	xo_attr("value", "%lld", (long long) bytes);
443	xo_emit(fmt, buf);
444}
445
446/*
447 * Print an inode count in "human-readable" format.
448 */
449static void
450prthumanvalinode(const char *fmt, int64_t bytes)
451{
452	char buf[6];
453	int flags;
454
455	flags = HN_NOSPACE | HN_DECIMAL | HN_DIVISOR_1000;
456
457	humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
458	    bytes, "", HN_AUTOSCALE, flags);
459
460	xo_attr("value", "%lld", (long long) bytes);
461	xo_emit(fmt, buf);
462}
463
464/*
465 * Convert statfs returned file system size into BLOCKSIZE units.
466 */
467static intmax_t
468fsbtoblk(int64_t num, uint64_t fsbs, u_long bs)
469{
470	return (num * (intmax_t) fsbs / (int64_t) bs);
471}
472
473/*
474 * Print out status about a file system.
475 */
476static void
477prtstat(struct statfs *sfsp, struct maxwidths *mwp)
478{
479	static long blocksize;
480	static int headerlen, timesthrough = 0;
481	static const char *header;
482	int64_t used, availblks, inodes;
483	const char *format;
484
485	if (++timesthrough == 1) {
486		mwp->mntfrom = imax(mwp->mntfrom, (int)strlen("Filesystem"));
487		mwp->fstype = imax(mwp->fstype, (int)strlen("Type"));
488		if (thousands) {		/* make space for commas */
489		    mwp->total += (mwp->total - 1) / 3;
490		    mwp->used  += (mwp->used - 1) / 3;
491		    mwp->avail += (mwp->avail - 1) / 3;
492		    mwp->iused += (mwp->iused - 1) / 3;
493		    mwp->ifree += (mwp->ifree - 1) / 3;
494		}
495		if (hflag) {
496			header = "   Size";
497			mwp->total = mwp->used = mwp->avail =
498			    (int)strlen(header);
499		} else {
500			header = getbsize(&headerlen, &blocksize);
501			mwp->total = imax(mwp->total, headerlen);
502		}
503		mwp->used = imax(mwp->used, (int)strlen("Used"));
504		mwp->avail = imax(mwp->avail, (int)strlen("Avail"));
505
506		xo_emit("{T:/%-*s}", mwp->mntfrom, "Filesystem");
507		if (Tflag)
508			xo_emit("  {T:/%-*s}", mwp->fstype, "Type");
509		xo_emit(" {T:/%*s} {T:/%*s} {T:/%*s} {T:Capacity}",
510			mwp->total, header,
511			mwp->used, "Used", mwp->avail, "Avail");
512		if (iflag) {
513			mwp->iused = imax(hflag ? 0 : mwp->iused,
514			    (int)strlen("  iused"));
515			mwp->ifree = imax(hflag ? 0 : mwp->ifree,
516			    (int)strlen("ifree"));
517			xo_emit(" {T:/%*s} {T:/%*s} {T:\%iused}",
518			    mwp->iused - 2, "iused", mwp->ifree, "ifree");
519		}
520		xo_emit("  {T:Mounted on}\n");
521	}
522
523	xo_open_instance("filesystem");
524	/* Check for 0 block size.  Can this happen? */
525	if (sfsp->f_bsize == 0) {
526		xo_warnx ("File system %s does not have a block size, assuming 512.",
527		    sfsp->f_mntonname);
528		sfsp->f_bsize = 512;
529	}
530	xo_emit("{tk:name/%-*s}", mwp->mntfrom, sfsp->f_mntfromname);
531	if (Tflag)
532		xo_emit("  {:type/%-*s}", mwp->fstype, sfsp->f_fstypename);
533	used = sfsp->f_blocks - sfsp->f_bfree;
534	availblks = sfsp->f_bavail + used;
535	if (hflag) {
536		prthuman(sfsp, used);
537	} else {
538		if (thousands)
539		    format = " {t:total-blocks/%*j'd} {t:used-blocks/%*j'd} "
540			"{t:available-blocks/%*j'd}";
541		else
542		    format = " {t:total-blocks/%*jd} {t:used-blocks/%*jd} "
543			"{t:available-blocks/%*jd}";
544		xo_emit(format,
545		    mwp->total, fsbtoblk(sfsp->f_blocks,
546		    sfsp->f_bsize, blocksize),
547		    mwp->used, fsbtoblk(used, sfsp->f_bsize, blocksize),
548		    mwp->avail, fsbtoblk(sfsp->f_bavail,
549		    sfsp->f_bsize, blocksize));
550	}
551	xo_emit(" {:used-percent/%5.0f}{U:%%}",
552	    availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
553	if (iflag) {
554		inodes = sfsp->f_files;
555		used = inodes - sfsp->f_ffree;
556		if (hflag) {
557			xo_emit("  ");
558			prthumanvalinode(" {:inodes-used/%5s}", used);
559			prthumanvalinode(" {:inodes-free/%5s}", sfsp->f_ffree);
560		} else {
561			if (thousands)
562			    format = " {:inodes-used/%*j'd} {:inodes-free/%*j'd}";
563			else
564			    format = " {:inodes-used/%*jd} {:inodes-free/%*jd}";
565			xo_emit(format, mwp->iused, (intmax_t)used,
566			    mwp->ifree, (intmax_t)sfsp->f_ffree);
567		}
568		xo_emit(" {:inodes-used-percent/%4.0f}{U:%%} ",
569			inodes == 0 ? 100.0 :
570			(double)used / (double)inodes * 100.0);
571	} else
572		xo_emit("  ");
573	if (strncmp(sfsp->f_mntfromname, "total", MNAMELEN) != 0)
574		xo_emit("  {:mounted-on}", sfsp->f_mntonname);
575	xo_emit("\n");
576	xo_close_instance("filesystem");
577}
578
579static void
580addstat(struct statfs *totalfsp, struct statfs *statfsp)
581{
582	uint64_t bsize;
583
584	bsize = statfsp->f_bsize / totalfsp->f_bsize;
585	totalfsp->f_blocks += statfsp->f_blocks * bsize;
586	totalfsp->f_bfree += statfsp->f_bfree * bsize;
587	totalfsp->f_bavail += statfsp->f_bavail * bsize;
588	totalfsp->f_files += statfsp->f_files;
589	totalfsp->f_ffree += statfsp->f_ffree;
590}
591
592/*
593 * Update the maximum field-width information in `mwp' based on
594 * the file system specified by `sfsp'.
595 */
596static void
597update_maxwidths(struct maxwidths *mwp, const struct statfs *sfsp)
598{
599	static long blocksize = 0;
600	int dummy;
601
602	if (blocksize == 0)
603		getbsize(&dummy, &blocksize);
604
605	mwp->mntfrom = imax(mwp->mntfrom, (int)strlen(sfsp->f_mntfromname));
606	mwp->fstype = imax(mwp->fstype, (int)strlen(sfsp->f_fstypename));
607	mwp->total = imax(mwp->total, int64width(
608	    fsbtoblk((int64_t)sfsp->f_blocks, sfsp->f_bsize, blocksize)));
609	mwp->used = imax(mwp->used,
610	    int64width(fsbtoblk((int64_t)sfsp->f_blocks -
611	    (int64_t)sfsp->f_bfree, sfsp->f_bsize, blocksize)));
612	mwp->avail = imax(mwp->avail, int64width(fsbtoblk(sfsp->f_bavail,
613	    sfsp->f_bsize, blocksize)));
614	mwp->iused = imax(mwp->iused, int64width((int64_t)sfsp->f_files -
615	    sfsp->f_ffree));
616	mwp->ifree = imax(mwp->ifree, int64width(sfsp->f_ffree));
617}
618
619/* Return the width in characters of the specified value. */
620static int
621int64width(int64_t val)
622{
623	int len;
624
625	len = 0;
626	/* Negative or zero values require one extra digit. */
627	if (val <= 0) {
628		val = -val;
629		len++;
630	}
631	while (val > 0) {
632		len++;
633		val /= 10;
634	}
635
636	return (len);
637}
638
639static void
640usage(void)
641{
642
643	xo_error(
644"usage: df [-b | -g | -H | -h | -k | -m | -P] [-acilnT] [-t type] [-,]\n"
645"          [file | filesystem ...]\n");
646	exit(EX_USAGE);
647}
648
649static char *
650makenetvfslist(void)
651{
652	char *str, *strptr, **listptr;
653	struct xvfsconf *xvfsp, *keep_xvfsp;
654	size_t buflen;
655	int cnt, i, maxvfsconf;
656
657	if (sysctlbyname("vfs.conflist", NULL, &buflen, NULL, 0) < 0) {
658		xo_warn("sysctl(vfs.conflist)");
659		return (NULL);
660	}
661	xvfsp = malloc(buflen);
662	if (xvfsp == NULL) {
663		xo_warnx("malloc failed");
664		return (NULL);
665	}
666	keep_xvfsp = xvfsp;
667	if (sysctlbyname("vfs.conflist", xvfsp, &buflen, NULL, 0) < 0) {
668		xo_warn("sysctl(vfs.conflist)");
669		free(keep_xvfsp);
670		return (NULL);
671	}
672	maxvfsconf = buflen / sizeof(struct xvfsconf);
673
674	if ((listptr = malloc(sizeof(char*) * maxvfsconf)) == NULL) {
675		xo_warnx("malloc failed");
676		free(keep_xvfsp);
677		return (NULL);
678	}
679
680	for (cnt = 0, i = 0; i < maxvfsconf; i++) {
681		if (xvfsp->vfc_flags & VFCF_NETWORK) {
682			listptr[cnt++] = strdup(xvfsp->vfc_name);
683			if (listptr[cnt-1] == NULL) {
684				xo_warnx("malloc failed");
685				free(listptr);
686				free(keep_xvfsp);
687				return (NULL);
688			}
689		}
690		xvfsp++;
691	}
692
693	if (cnt == 0 ||
694	    (str = malloc(sizeof(char) * (32 * cnt + cnt + 2))) == NULL) {
695		if (cnt > 0)
696			xo_warnx("malloc failed");
697		free(listptr);
698		free(keep_xvfsp);
699		return (NULL);
700	}
701
702	*str = 'n'; *(str + 1) = 'o';
703	for (i = 0, strptr = str + 2; i < cnt; i++, strptr++) {
704		strlcpy(strptr, listptr[i], 32);
705		strptr += strlen(listptr[i]);
706		*strptr = ',';
707		free(listptr[i]);
708	}
709	*(--strptr) = '\0';
710
711	free(keep_xvfsp);
712	free(listptr);
713	return (str);
714}
715