bin/df/df.c

   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  * 3. 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  * @(#) Copyright (c) 1980, 1990, 1993, 1994 The Regents of the University of California.  All rights reserved.
  35  * @(#)df.c     8.9 (Berkeley) 5/8/95
  36  * $FreeBSD: src/bin/df/df.c,v 1.23.2.9 2002/07/01 00:14:24 iedowse Exp $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/stat.h>
  41 #include <sys/mount.h>
  42 #include <sys/sysctl.h>
  43 #include <sys/statvfs.h>
  44
  45 #include <vfs/ufs/dinode.h>
  46 #include <vfs/ufs/fs.h>
  47 #include <vfs/ufs/ufsmount.h>
  48
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <fcntl.h>
  52 #include <fstab.h>
  53 #include <libutil.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <sysexits.h>
  58 #include <unistd.h>
  59
  60 #define UNITS_SI 1
  61 #define UNITS_2 2
  62
  63 /* Maximum widths of various fields. */
  64 struct maxwidths {
  65         int mntfrom;
  66         int fstype;
  67         int total;
  68         int used;
  69         int avail;
  70         int iused;
  71         int ifree;
  72 };
  73
  74 /* vfslist.c */
  75 char    **makevfslist(char *);
  76 int       checkvfsname(const char *, char **);
  77
  78 static int       bread(off_t, void *, int);
  79 static char     *getmntpt(char *);
  80 static int       quadwidth(int64_t);
  81 static char     *makenetvfslist(void);
  82 static void      prthuman(struct statvfs *, int64_t);
  83 static void      prthumanval(int64_t);
  84 static void      prtstat(struct statfs *, struct statvfs *, struct maxwidths *);
  85 static long      regetmntinfo(struct statfs **, struct statvfs **, long, char **);
  86 static int       ufs_df(char *, struct maxwidths *);
  87 static void      update_maxwidths(struct maxwidths *, struct statfs *, struct statvfs *);
  88 static void      usage(void);
  89
  90 int     aflag = 0, hflag, iflag, nflag, Tflag;
  91 struct  ufs_args mdev;
  92
  93 static __inline int
  94 imax(int a, int b)
  95 {
  96         return (a > b ? a : b);
  97 }
  98
  99 static __inline int64_t
 100 qmax(int64_t a, int64_t b)
 101 {
 102         return (a > b ? a : b);
 103 }
 104
 105 int
 106 main(int argc, char **argv)
 107 {
 108         struct stat stbuf;
 109         struct statfs statfsbuf, *mntbuf;
 110         struct statvfs statvfsbuf, *mntvbuf;
 111         struct maxwidths maxwidths;
 112         const char *fstype;
 113         char *mntpath, *mntpt, **vfslist;
 114         long mntsize;
 115         int ch, i, rv;
 116
 117         fstype = "ufs";
 118
 119         vfslist = NULL;
 120         while ((ch = getopt(argc, argv, "abgHhiklmnPt:T")) != -1)
 121                 switch (ch) {
 122                 case 'a':
 123                         aflag = 1;
 124                         break;
 125                 case 'b':
 126                                 /* FALLTHROUGH */
 127                 case 'P':
 128                         if (setenv("BLOCKSIZE", "512", 1) != 0)
 129                                 warn("setenv: cannot set BLOCKSIZE=512");
 130                         hflag = 0;
 131                         break;
 132                 case 'g':
 133                         if (setenv("BLOCKSIZE", "1g", 1) != 0)
 134                                 warn("setenv: cannot set BLOCKSIZE=1g");
 135                         hflag = 0;
 136                         break;
 137                 case 'H':
 138                         hflag = UNITS_SI;
 139                         break;
 140                 case 'h':
 141                         hflag = UNITS_2;
 142                         break;
 143                 case 'i':
 144                         iflag = 1;
 145                         break;
 146                 case 'k':
 147                         if (setenv("BLOCKSIZE", "1k", 1) != 0)
 148                                 warn("setenv: cannot set BLOCKSIZE=1k");
 149                         hflag = 0;
 150                         break;
 151                 case 'l':
 152                         if (vfslist != NULL)
 153                                 errx(1, "-l and -t are mutually exclusive.");
 154                         vfslist = makevfslist(makenetvfslist());
 155                         break;
 156                 case 'm':
 157                         if (setenv("BLOCKSIZE", "1m", 1) != 0)
 158                                 warn("setenv: cannot set BLOCKSIZE=1m");
 159                         hflag = 0;
 160                         break;
 161                 case 'n':
 162                         nflag = 1;
 163                         break;
 164                 case 't':
 165                         if (vfslist != NULL)
 166                                 errx(1, "only one -t option may be specified");
 167                         fstype = optarg;
 168                         vfslist = makevfslist(optarg);
 169                         break;
 170                 case 'T':
 171                         Tflag = 1;
 172                         break;
 173                 case '?':
 174                 default:
 175                         usage();
 176                 }
 177         argc -= optind;
 178         argv += optind;
 179
 180         mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT);
 181         bzero(&maxwidths, sizeof(maxwidths));
 182         for (i = 0; i < mntsize; i++)
 183                 update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]);
 184
 185         rv = 0;
 186         if (!*argv) {
 187                 mntsize = regetmntinfo(&mntbuf, &mntvbuf, mntsize, vfslist);
 188                 bzero(&maxwidths, sizeof(maxwidths));
 189                 for (i = 0; i < mntsize; i++)
 190                         update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]);
 191                 for (i = 0; i < mntsize; i++) {
 192                         if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0)
 193                                 prtstat(&mntbuf[i], &mntvbuf[i], &maxwidths);
 194                 }
 195                 exit(rv);
 196         }
 197
 198         for (; *argv; argv++) {
 199                 if (stat(*argv, &stbuf) < 0) {
 200                         if ((mntpt = getmntpt(*argv)) == NULL) {
 201                                 warn("%s", *argv);
 202                                 rv = 1;
 203                                 continue;
 204                         }
 205                 } else if (S_ISCHR(stbuf.st_mode)) {
 206                         if ((mntpt = getmntpt(*argv)) == NULL) {
 207                                 mdev.fspec = *argv;
 208                                 mntpath = strdup("/tmp/df.XXXXXX");
 209                                 if (mntpath == NULL) {
 210                                         warn("strdup failed");
 211                                         rv = 1;
 212                                         continue;
 213                                 }
 214                                 mntpt = mkdtemp(mntpath);
 215                                 if (mntpt == NULL) {
 216                                         warn("mkdtemp(\"%s\") failed", mntpath);
 217                                         rv = 1;
 218                                         free(mntpath);
 219                                         continue;
 220                                 }
 221                                 if (mount(fstype, mntpt, MNT_RDONLY,
 222                                     &mdev) != 0) {
 223                                         rv = ufs_df(*argv, &maxwidths) || rv;
 224                                         rmdir(mntpt);
 225                                         free(mntpath);
 226                                         continue;
 227                                 } else if (statfs(mntpt, &statfsbuf) == 0 &&
 228                                            statvfs(mntpt, &statvfsbuf) == 0) {
 229                                         statfsbuf.f_mntonname[0] = '\0';
 230                                         prtstat(&statfsbuf, &statvfsbuf, &maxwidths);
 231                                 } else {
 232                                         warn("%s", *argv);
 233                                         rv = 1;
 234                                 }
 235                                 unmount(mntpt, 0);
 236                                 rmdir(mntpt);
 237                                 free(mntpath);
 238                                 continue;
 239                         }
 240                 } else
 241                         mntpt = *argv;
 242                 /*
 243                  * Statfs does not take a `wait' flag, so we cannot
 244                  * implement nflag here.
 245                  */
 246                 if (statfs(mntpt, &statfsbuf) < 0) {
 247                         warn("%s", mntpt);
 248                         rv = 1;
 249                         continue;
 250                 }
 251                 if (statvfs(mntpt, &statvfsbuf) < 0) {
 252                         warn("%s", mntpt);
 253                         rv = 1;
 254                         continue;
 255                 }
 256                 /*
 257                  * Check to make sure the arguments we've been given are
 258                  * satisfied. Return an error if we have been asked to
 259                  * list a mount point that does not match the other args
 260                  * we've been given (-l, -t, etc.).
 261                  */
 262                 if (checkvfsname(statfsbuf.f_fstypename, vfslist)) {
 263                         rv = 1;
 264                         continue;
 265                 }
 266
 267                 if (argc == 1) {
 268                         bzero(&maxwidths, sizeof(maxwidths));
 269                         update_maxwidths(&maxwidths, &statfsbuf, &statvfsbuf);
 270                 }
 271                 prtstat(&statfsbuf, &statvfsbuf, &maxwidths);
 272         }
 273         return (rv);
 274 }
 275
 276 static char *
 277 getmntpt(char *name)
 278 {
 279         long mntsize, i;
 280         struct statfs *mntbuf;
 281         struct statvfs *mntvbuf;
 282
 283         mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT);
 284         for (i = 0; i < mntsize; i++) {
 285                 if (!strcmp(mntbuf[i].f_mntfromname, name))
 286                         return (mntbuf[i].f_mntonname);
 287         }
 288         return (0);
 289 }
 290
 291 /*
 292  * Make a pass over the filesystem info in ``mntbuf'' filtering out
 293  * filesystem types not in vfslist and possibly re-stating to get
 294  * current (not cached) info.  Returns the new count of valid statfs bufs.
 295  */
 296 static long
 297 regetmntinfo(struct statfs **mntbufp, struct statvfs **mntvbufp, long mntsize, char **vfslist)
 298 {
 299         int i, j;
 300         struct statfs *mntbuf;
 301         struct statvfs *mntvbuf;
 302
 303         if (vfslist == NULL)
 304                 return (nflag ? mntsize : getmntvinfo(mntbufp, mntvbufp, MNT_WAIT));
 305
 306         mntbuf = *mntbufp;
 307         mntvbuf = *mntvbufp;
 308         for (j = 0, i = 0; i < mntsize; i++) {
 309                 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
 310                         continue;
 311                 if (!nflag) {
 312                         statfs(mntbuf[i].f_mntonname,&mntbuf[j]);
 313                         statvfs(mntbuf[i].f_mntonname,&mntvbuf[j]);
 314                 } else if (i != j) {
 315                         mntbuf[j] = mntbuf[i];
 316                         mntvbuf[j] = mntvbuf[i];
 317                 }
 318                 j++;
 319         }
 320         return (j);
 321 }
 322
 323 static void
 324 prthuman(struct statvfs *vsfsp, int64_t used)
 325 {
 326         prthumanval(vsfsp->f_blocks * vsfsp->f_bsize);
 327         prthumanval(used * vsfsp->f_bsize);
 328         prthumanval(vsfsp->f_bavail * vsfsp->f_bsize);
 329 }
 330
 331 static void
 332 prthumanval(int64_t bytes)
 333 {
 334         char buf[6];
 335         int flags;
 336
 337         flags = HN_B | HN_NOSPACE | HN_DECIMAL;
 338         if (hflag == UNITS_SI)
 339                 flags |= HN_DIVISOR_1000;
 340
 341         humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
 342             bytes, "", HN_AUTOSCALE, flags);
 343
 344         printf(" %6s", buf);
 345 }
 346
 347 /*
 348  * Print an inode count in "human-readable" format.
 349  */
 350 static void
 351 prthumanvalinode(int64_t bytes)
 352 {
 353         char buf[6];
 354         int flags;
 355
 356         flags = HN_NOSPACE | HN_DECIMAL | HN_DIVISOR_1000;
 357
 358         humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
 359             bytes, "", HN_AUTOSCALE, flags);
 360
 361         printf(" %5s", buf);
 362 }
 363
 364 /*
 365  * Convert statfs returned filesystem size into BLOCKSIZE units.
 366  * Attempts to avoid overflow for large filesystems.
 367  */
 368 static intmax_t
 369 fsbtoblk(int64_t num, uint64_t bsize, u_long reqbsize)
 370 {
 371         if (bsize != 0 && bsize < reqbsize)
 372                 return (num / (intmax_t)(reqbsize / bsize));
 373         else
 374                 return (num * (intmax_t)(bsize / reqbsize));
 375 }
 376
 377 /*
 378  * Print out status about a filesystem.
 379  */
 380 static void
 381 prtstat(struct statfs *sfsp, struct statvfs *vsfsp, struct maxwidths *mwp)
 382 {
 383         static long blocksize;
 384         static int headerlen, timesthrough;
 385         static const char *header;
 386         int64_t used, availblks, inodes;
 387
 388         if (++timesthrough == 1) {
 389                 mwp->mntfrom = imax(mwp->mntfrom, strlen("Filesystem"));
 390                 mwp->fstype = imax(mwp->fstype, strlen("Type"));
 391                 if (hflag) {
 392                         header = "  Size";
 393                         mwp->total = mwp->used = mwp->avail = strlen(header);
 394                 } else {
 395                         header = getbsize(&headerlen, &blocksize);
 396                         mwp->total = imax(mwp->total, headerlen);
 397                 }
 398                 mwp->used = imax(mwp->used, strlen("Used"));
 399                 mwp->avail = imax(mwp->avail, strlen("Avail"));
 400
 401                 printf("%-*s", mwp->mntfrom, "Filesystem");
 402                 if (Tflag)
 403                         printf("  %-*s", mwp->fstype, "Type");
 404                 printf(" %-*s %*s %*s Capacity", mwp->total, header, mwp->used,
 405                     "Used", mwp->avail, "Avail");
 406                 if (iflag) {
 407                         mwp->iused = imax(hflag ? 0 : mwp->iused,
 408                             (int)strlen("  iused"));
 409                         mwp->ifree = imax(hflag ? 0 : mwp->ifree,
 410                             (int)strlen("ifree"));
 411                         printf(" %*s %*s %%iused", mwp->iused - 2,
 412                             "iused", mwp->ifree, "ifree");
 413                 }
 414                 printf("  Mounted on\n");
 415         }
 416         printf("%-*s", mwp->mntfrom, sfsp->f_mntfromname);
 417         if (Tflag)
 418                 printf("  %-*s", mwp->fstype, sfsp->f_fstypename);
 419         used = vsfsp->f_blocks - vsfsp->f_bfree;
 420         availblks = vsfsp->f_bavail + used;
 421         if (hflag) {
 422                 prthuman(vsfsp, used);
 423         } else {
 424                 printf(" %*jd %*jd %*jd", mwp->total,
 425                     fsbtoblk(vsfsp->f_blocks, vsfsp->f_bsize, blocksize),
 426                     mwp->used, fsbtoblk(used, vsfsp->f_bsize, blocksize),
 427                     mwp->avail, fsbtoblk(vsfsp->f_bavail, vsfsp->f_bsize,
 428                     blocksize));
 429         }
 430         printf(" %5.0f%%",
 431             availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
 432         if (iflag) {
 433                 inodes = vsfsp->f_files;
 434                 used = inodes - vsfsp->f_ffree;
 435                 if (hflag) {
 436                         printf("  ");
 437                         prthumanvalinode(used);
 438                         prthumanvalinode(vsfsp->f_ffree);
 439                 } else {
 440                         printf(" %*jd %*jd", mwp->iused, (intmax_t)used,
 441                             mwp->ifree, (intmax_t)vsfsp->f_ffree);
 442                 }
 443                 printf(" %4.0f%% ", inodes == 0 ? 100.0 :
 444                     (double)used / (double)inodes * 100.0);
 445         } else
 446                 printf("  ");
 447         printf("  %s\n", sfsp->f_mntonname);
 448 }
 449
 450 /*
 451  * Update the maximum field-width information in `mwp' based on
 452  * the filesystem specified by `sfsp'.
 453  */
 454 static void
 455 update_maxwidths(struct maxwidths *mwp, struct statfs *sfsp, struct statvfs *vsfsp)
 456 {
 457         static long blocksize;
 458         int dummy;
 459
 460         if (blocksize == 0)
 461                 getbsize(&dummy, &blocksize);
 462
 463         mwp->mntfrom = imax(mwp->mntfrom, strlen(sfsp->f_mntfromname));
 464         mwp->fstype = imax(mwp->fstype, strlen(sfsp->f_fstypename));
 465         mwp->total = imax(mwp->total, quadwidth(fsbtoblk(vsfsp->f_blocks,
 466             vsfsp->f_bsize, blocksize)));
 467         mwp->used = imax(mwp->used, quadwidth(fsbtoblk(vsfsp->f_blocks -
 468             vsfsp->f_bfree, vsfsp->f_bsize, blocksize)));
 469         mwp->avail = imax(mwp->avail, quadwidth(fsbtoblk(vsfsp->f_bavail,
 470             vsfsp->f_bsize, blocksize)));
 471         mwp->iused = imax(mwp->iused, quadwidth(vsfsp->f_files -
 472             vsfsp->f_ffree));
 473         mwp->ifree = imax(mwp->ifree, quadwidth(vsfsp->f_ffree));
 474 }
 475
 476 /* Return the width in characters of the specified long. */
 477 static int
 478 quadwidth(int64_t val)
 479 {
 480         int len;
 481
 482         len = 0;
 483         /* Negative or zero values require one extra digit. */
 484         if (val <= 0) {
 485                 val = -val;
 486                 len++;
 487         }
 488         while (val > 0) {
 489                 len++;
 490                 val /= 10;
 491         }
 492         return (len);
 493 }
 494
 495 /*
 496  * This code constitutes the pre-system call Berkeley df code for extracting
 497  * information from filesystem superblocks.
 498  */
 499
 500 union {
 501         struct fs iu_fs;
 502         char dummy[SBSIZE];
 503 } sb;
 504 #define sblock sb.iu_fs
 505
 506 int     rfd;
 507
 508 static int
 509 ufs_df(char *file, struct maxwidths *mwp)
 510 {
 511         struct statfs statfsbuf;
 512         struct statvfs statvfsbuf;
 513         struct statfs *sfsp;
 514         struct statvfs *vsfsp;
 515         const char *mntpt;
 516         static int synced;
 517
 518         if (synced++ == 0)
 519                 sync();
 520
 521         if ((rfd = open(file, O_RDONLY)) < 0) {
 522                 warn("%s", file);
 523                 return (1);
 524         }
 525         if (bread((off_t)SBOFF, &sblock, SBSIZE) == 0) {
 526                 close(rfd);
 527                 return (1);
 528         }
 529         sfsp = &statfsbuf;
 530         vsfsp = &statvfsbuf;
 531         sfsp->f_type = 1;
 532         strcpy(sfsp->f_fstypename, "ufs");
 533         sfsp->f_flags = 0;
 534         sfsp->f_bsize = vsfsp->f_bsize = sblock.fs_fsize;
 535         sfsp->f_iosize = vsfsp->f_frsize = sblock.fs_bsize;
 536         sfsp->f_blocks = vsfsp->f_blocks = sblock.fs_dsize;
 537         sfsp->f_bfree = vsfsp->f_bfree =
 538                 sblock.fs_cstotal.cs_nbfree * sblock.fs_frag +
 539                 sblock.fs_cstotal.cs_nffree;
 540         sfsp->f_bavail = vsfsp->f_bavail = freespace(&sblock, sblock.fs_minfree);
 541         sfsp->f_files = vsfsp->f_files = sblock.fs_ncg * sblock.fs_ipg;
 542         sfsp->f_ffree = vsfsp->f_ffree = sblock.fs_cstotal.cs_nifree;
 543         sfsp->f_fsid.val[0] = 0;
 544         sfsp->f_fsid.val[1] = 0;
 545         if ((mntpt = getmntpt(file)) == NULL)
 546                 mntpt = "";
 547         memmove(&sfsp->f_mntonname[0], mntpt, (size_t)MNAMELEN);
 548         memmove(&sfsp->f_mntfromname[0], file, (size_t)MNAMELEN);
 549         prtstat(sfsp, vsfsp, mwp);
 550         close(rfd);
 551         return (0);
 552 }
 553
 554 static int
 555 bread(off_t off, void *buf, int cnt)
 556 {
 557         ssize_t nr;
 558
 559         lseek(rfd, off, SEEK_SET);
 560         if ((nr = read(rfd, buf, (size_t)cnt)) != (ssize_t)cnt) {
 561                 /* Probably a dismounted disk if errno == EIO. */
 562                 if (errno != EIO)
 563                         fprintf(stderr, "\ndf: %lld: %s\n",
 564                             (long long)off, strerror(nr > 0 ? EIO : errno));
 565                 return (0);
 566         }
 567         return (1);
 568 }
 569
 570 static void
 571 usage(void)
 572 {
 573
 574         fprintf(stderr,
 575             "usage: df [-b | -H | -h | -k | -m | -P] [-ailnT] [-t type] [file | filesystem ...]\n");
 576         exit(EX_USAGE);
 577 }
 578
 579 static char *
 580 makenetvfslist(void)
 581 {
 582         char *str, *strptr, **listptr;
 583         int mib[3], maxvfsconf, cnt=0, i;
 584         size_t miblen;
 585         struct ovfsconf *ptr;
 586
 587         mib[0] = CTL_VFS; mib[1] = VFS_GENERIC; mib[2] = VFS_MAXTYPENUM;
 588         miblen=sizeof(maxvfsconf);
 589         if (sysctl(mib, (unsigned int)(sizeof(mib) / sizeof(mib[0])),
 590             &maxvfsconf, &miblen, NULL, 0)) {
 591                 warnx("sysctl failed");
 592                 return (NULL);
 593         }
 594
 595         if ((listptr = malloc(sizeof(char*) * maxvfsconf)) == NULL) {
 596                 warnx("malloc failed");
 597                 return (NULL);
 598         }
 599
 600         for (ptr = getvfsent(); ptr; ptr = getvfsent())
 601                 if (ptr->vfc_flags & VFCF_NETWORK) {
 602                         listptr[cnt++] = strdup(ptr->vfc_name);
 603                         if (listptr[cnt-1] == NULL) {
 604                                 warnx("malloc failed");
 605                                 free(listptr);
 606                                 return (NULL);
 607                         }
 608                 }
 609
 610         if (cnt == 0 ||
 611             (str = malloc(sizeof(char) * (32 * cnt + cnt + 2))) == NULL) {
 612                 if (cnt > 0)
 613                         warnx("malloc failed");
 614                 free(listptr);
 615                 return (NULL);
 616         }
 617
 618         *str = 'n'; *(str + 1) = 'o';
 619         for (i = 0, strptr = str + 2; i < cnt; i++, strptr++) {
 620                 strncpy(strptr, listptr[i], 32);
 621                 strptr += strlen(listptr[i]);
 622                 *strptr = ',';
 623                 free(listptr[i]);
 624         }
 625         *(--strptr) = '\0';
 626
 627         free(listptr);
 628         return (str);
 629 }