du/du.c

   1 /*      $NetBSD: du.c,v 1.14 1998/02/15 17:08:18 kleink Exp $   */
   2
   3 /*
   4  * Copyright (c) 1989, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Chris Newcomb.
   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. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include <sys/cdefs.h>
  40 #ifndef lint
  41 __COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\n\
  42         The Regents of the University of California.  All rights reserved.\n");
  43 #endif /* not lint */
  44
  45 #ifndef lint
  46 #if 0
  47 static char sccsid[] = "@(#)du.c        8.5 (Berkeley) 5/4/95";
  48 #else
  49 __RCSID("$NetBSD: du.c,v 1.14 1998/02/15 17:08:18 kleink Exp $");
  50 #endif
  51 #endif /* not lint */
  52
  53 #include <sys/types.h>
  54 #include <sys/stat.h>
  55
  56 #include <dirent.h>
  57 #include <err.h>
  58 #include <errno.h>
  59 #include <fts.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63 #include <unistd.h>
  64
  65 int     linkchk __P((FTSENT *));
  66 int     main __P((int, char **));
  67 void    usage __P((void));
  68
  69 int
  70 main(argc, argv)
  71         int argc;
  72         char *argv[];
  73 {
  74         FTS *fts;
  75         FTSENT *p;
  76         long blocksize, totalblocks;
  77         int ftsoptions, listdirs, listfiles;
  78         int Hflag, Lflag, Pflag, aflag, ch, cflag, kflag, notused, rval, sflag;
  79         char **save;
  80
  81         save = argv;
  82         Hflag = Lflag = Pflag = aflag = cflag = kflag = sflag = 0;
  83         totalblocks = 0;
  84         ftsoptions = FTS_PHYSICAL;
  85         while ((ch = getopt(argc, argv, "HLPackrsx")) != -1)
  86                 switch (ch) {
  87                 case 'H':
  88                         Hflag = 1;
  89                         Lflag = Pflag = 0;
  90                         break;
  91                 case 'L':
  92                         Lflag = 1;
  93                         Hflag = Pflag = 0;
  94                         break;
  95                 case 'P':
  96                         Pflag = 1;
  97                         Hflag = Lflag = 0;
  98                         break;
  99                 case 'a':
 100                         aflag = 1;
 101                         break;
 102                 case 'c':
 103                         cflag = 1;
 104                         break;
 105                 case 'k':
 106                         blocksize = 1024;
 107                         kflag = 1;
 108                         break;
 109                 case 'r':
 110                         break;
 111                 case 's':
 112                         sflag = 1;
 113                         break;
 114                 case 'x':
 115                         ftsoptions |= FTS_XDEV;
 116                         break;
 117                 case '?':
 118                 default:
 119                         usage();
 120                 }
 121         argc -= optind;
 122         argv += optind;
 123
 124         /*
 125          * XXX
 126          * Because of the way that fts(3) works, logical walks will not count
 127          * the blocks actually used by symbolic links.  We rationalize this by
 128          * noting that users computing logical sizes are likely to do logical
 129          * copies, so not counting the links is correct.  The real reason is
 130          * that we'd have to re-implement the kernel's symbolic link traversing
 131          * algorithm to get this right.  If, for example, you have relative
 132          * symbolic links referencing other relative symbolic links, it gets
 133          * very nasty, very fast.  The bottom line is that it's documented in
 134          * the man page, so it's a feature.
 135          */
 136         if (Hflag)
 137                 ftsoptions |= FTS_COMFOLLOW;
 138         if (Lflag) {
 139                 ftsoptions &= ~FTS_PHYSICAL;
 140                 ftsoptions |= FTS_LOGICAL;
 141         }
 142
 143         if (aflag) {
 144                 if (sflag)
 145                         usage();
 146                 listdirs = listfiles = 1;
 147         } else if (sflag)
 148                 listdirs = listfiles = 0;
 149         else {
 150                 listfiles = 0;
 151                 listdirs = 1;
 152         }
 153
 154         if (!*argv) {
 155                 argv = save;
 156                 argv[0] = ".";
 157                 argv[1] = NULL;
 158         }
 159
 160         if (!kflag)
 161                 (void)getbsize(&notused, &blocksize);
 162         blocksize /= 512;
 163
 164         if ((fts = fts_open(argv, ftsoptions, NULL)) == NULL)
 165                 err(1, "fts_open `%s'", *argv);
 166
 167         for (rval = 0; (p = fts_read(fts)) != NULL;)
 168                 switch (p->fts_info) {
 169                 case FTS_D:                     /* Ignore. */
 170                         break;
 171                 case FTS_DP:
 172                         p->fts_parent->fts_number +=
 173                             p->fts_number += p->fts_statp->st_blocks;
 174                         if (cflag)
 175                                 totalblocks += p->fts_statp->st_blocks;
 176                         /*
 177                          * If listing each directory, or not listing files
 178                          * or directories and this is post-order of the
 179                          * root of a traversal, display the total.
 180                          */
 181                         if (listdirs || (!listfiles && !p->fts_level))
 182                                 (void)printf("%ld\t%s\n",
 183                                     howmany(p->fts_number, blocksize),
 184                                     p->fts_path);
 185                         break;
 186                 case FTS_DC:                    /* Ignore. */
 187                         break;
 188                 case FTS_DNR:                   /* Warn, continue. */
 189                 case FTS_ERR:
 190                 case FTS_NS:
 191                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 192                         rval = 1;
 193                         break;
 194                 default:
 195                         if (p->fts_statp->st_nlink > 1 && linkchk(p))
 196                                 break;
 197                         /*
 198                          * If listing each file, or a non-directory file was
 199                          * the root of a traversal, display the total.
 200                          */
 201                         if (listfiles || !p->fts_level)
 202                                 (void)printf("%qd\t%s\n", (long long)
 203                                     howmany(p->fts_statp->st_blocks, blocksize),
 204                                     p->fts_path);
 205                         p->fts_parent->fts_number += p->fts_statp->st_blocks;
 206                         if (cflag)
 207                                 totalblocks += p->fts_statp->st_blocks;
 208                 }
 209         if (errno)
 210                 err(1, "fts_read");
 211         if (cflag)
 212                 (void)printf("%ld\ttotal\n",
 213                     howmany(totalblocks, blocksize));
 214         exit(0);
 215 }
 216
 217 typedef struct _ID {
 218         dev_t   dev;
 219         ino_t   inode;
 220 } ID;
 221
 222 int
 223 linkchk(p)
 224         FTSENT *p;
 225 {
 226         static ID *files;
 227         static int maxfiles, nfiles;
 228         ID *fp, *start;
 229         ino_t ino;
 230         dev_t dev;
 231
 232         ino = p->fts_statp->st_ino;
 233         dev = p->fts_statp->st_dev;
 234         if ((start = files) != NULL)
 235                 for (fp = start + nfiles - 1; fp >= start; --fp)
 236                         if (ino == fp->inode && dev == fp->dev)
 237                                 return (1);
 238
 239         if (nfiles == maxfiles && (files = realloc((char *)files,
 240             (u_int)(sizeof(ID) * (maxfiles += 128)))) == NULL)
 241                 err(1, "realloc");
 242         files[nfiles].inode = ino;
 243         files[nfiles].dev = dev;
 244         ++nfiles;
 245         return (0);
 246 }
 247
 248 void
 249 usage()
 250 {
 251
 252         (void)fprintf(stderr,
 253                 "usage: du [-H | -L | -P] [-a | -s] [-ckx] [file ...]\n");
 254         exit(1);
 255 }