/* $NetBSD: du.c,v 1.26 2005/02/17 17:40:59 xtraeme Exp $ */ /* * Copyright (c) 1989, 1993, 1994 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Chris Newcomb. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #ifndef lint __COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n"); #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)du.c 8.5 (Berkeley) 5/4/95"; #else __RCSID("$NetBSD: du.c,v 1.26 2005/02/17 17:40:59 xtraeme Exp $"); #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include int linkchk(dev_t, ino_t); void prstat(const char *, int64_t); void usage(void); int hflag; long blocksize; int main(int argc, char *argv[]) { FTS *fts; FTSENT *p; int64_t totalblocks; int ftsoptions, listdirs, listfiles; int Hflag, Lflag, Pflag, aflag, ch, cflag, gkmflag, nflag, rval, sflag; const char *noargv[2]; Hflag = Lflag = Pflag = aflag = cflag = gkmflag = nflag = sflag = 0; totalblocks = 0; ftsoptions = FTS_PHYSICAL; while ((ch = getopt(argc, argv, "HLPacghkmnrsx")) != -1) switch (ch) { case 'H': Hflag = 1; Lflag = Pflag = 0; break; case 'L': Lflag = 1; Hflag = Pflag = 0; break; case 'P': Pflag = 1; Hflag = Lflag = 0; break; case 'a': aflag = 1; break; case 'c': cflag = 1; break; case 'g': blocksize = 1024 * 1024 * 1024; gkmflag = 1; break; case 'h': hflag = 1; break; case 'k': blocksize = 1024; gkmflag = 1; break; case 'm': blocksize = 1024 * 1024; gkmflag = 1; break; case 'n': nflag = 1; break; case 'r': break; case 's': sflag = 1; break; case 'x': ftsoptions |= FTS_XDEV; break; case '?': default: usage(); } argc -= optind; argv += optind; /* * XXX * Because of the way that fts(3) works, logical walks will not count * the blocks actually used by symbolic links. We rationalize this by * noting that users computing logical sizes are likely to do logical * copies, so not counting the links is correct. The real reason is * that we'd have to re-implement the kernel's symbolic link traversing * algorithm to get this right. If, for example, you have relative * symbolic links referencing other relative symbolic links, it gets * very nasty, very fast. The bottom line is that it's documented in * the man page, so it's a feature. */ if (Hflag) ftsoptions |= FTS_COMFOLLOW; if (Lflag) { ftsoptions &= ~FTS_PHYSICAL; ftsoptions |= FTS_LOGICAL; } if (aflag) { if (sflag) usage(); listdirs = listfiles = 1; } else if (sflag) listdirs = listfiles = 0; else { listfiles = 0; listdirs = 1; } if (!*argv) { noargv[0] = "."; noargv[1] = NULL; (const char *)argv = noargv; } if (!gkmflag) (void)getbsize(NULL, &blocksize); blocksize /= 512; if ((fts = fts_open(argv, ftsoptions, NULL)) == NULL) err(1, "fts_open `%s'", *argv); for (rval = 0; (p = fts_read(fts)) != NULL;) { if (nflag) { switch (p->fts_info) { case FTS_NS: case FTS_SLNONE: /* nothing */ break; default: if (p->fts_statp->st_flags & UF_NODUMP) { fts_set(fts, p, FTS_SKIP); continue; } } } switch (p->fts_info) { case FTS_D: /* Ignore. */ break; case FTS_DP: p->fts_parent->fts_number += p->fts_number += p->fts_statp->st_blocks; if (cflag) totalblocks += p->fts_statp->st_blocks; /* * If listing each directory, or not listing files * or directories and this is post-order of the * root of a traversal, display the total. */ if (listdirs || (!listfiles && !p->fts_level)) prstat(p->fts_path, p->fts_number); break; case FTS_DC: /* Ignore. */ break; case FTS_DNR: /* Warn, continue. */ case FTS_ERR: case FTS_NS: warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); rval = 1; break; default: if (p->fts_statp->st_nlink > 1 && linkchk(p->fts_statp->st_dev, p->fts_statp->st_ino)) break; /* * If listing each file, or a non-directory file was * the root of a traversal, display the total. */ if (listfiles || !p->fts_level) prstat(p->fts_path, p->fts_statp->st_blocks); p->fts_parent->fts_number += p->fts_statp->st_blocks; if (cflag) totalblocks += p->fts_statp->st_blocks; } } if (errno) err(1, "fts_read"); if (cflag) prstat("total", totalblocks); exit(rval); } void prstat(const char *fname, int64_t blocks) { if (hflag) { char buf[5]; int64_t sz = blocks * 512; humanize_number(buf, sizeof(buf), sz, "", HN_AUTOSCALE, HN_B | HN_NOSPACE | HN_DECIMAL); (void)printf("%s\t%s\n", buf, fname); } else (void)printf("%lld\t%s\n", (long long)howmany(blocks, (int64_t)blocksize), fname); } int linkchk(dev_t dev, ino_t ino) { static struct entry { dev_t dev; ino_t ino; } *htable; static int htshift; /* log(allocated size) */ static int htmask; /* allocated size - 1 */ static int htused; /* 2*number of insertions */ static int sawzero; /* Whether zero is in table or not */ int h, h2; uint64_t tmp; /* this constant is (1<<64)/((1+sqrt(5))/2) * aka (word size)/(golden ratio) */ const uint64_t HTCONST = 11400714819323198485ULL; const int HTBITS = CHAR_BIT * sizeof(tmp); /* Never store zero in hashtable */ if (dev == 0 && ino == 0) { h = sawzero; sawzero = 1; return h; } /* Extend hash table if necessary, keep load under 0.5 */ if (htused<<1 >= htmask) { struct entry *ohtable; if (!htable) htshift = 10; /* starting hashtable size */ else htshift++; /* exponential hashtable growth */ htmask = (1 << htshift) - 1; htused = 0; ohtable = htable; htable = calloc(htmask+1, sizeof(*htable)); if (!htable) err(1, "calloc"); /* populate newly allocated hashtable */ if (ohtable) { int i; for (i = 0; i <= htmask>>1; i++) if (ohtable[i].ino || ohtable[i].dev) linkchk(ohtable[i].dev, ohtable[i].ino); free(ohtable); } } /* multiplicative hashing */ tmp = dev; tmp <<= HTBITS>>1; tmp |= ino; tmp *= HTCONST; h = tmp >> (HTBITS - htshift); h2 = 1 | ( tmp >> (HTBITS - (htshift<<1) - 1)); /* must be odd */ /* open address hashtable search with double hash probing */ while (htable[h].ino || htable[h].dev) { if ((htable[h].ino == ino) && (htable[h].dev == dev)) return 1; h = (h + h2) & htmask; } /* Insert the current entry into hashtable */ htable[h].dev = dev; htable[h].ino = ino; htused++; return 0; } void usage(void) { (void)fprintf(stderr, "usage: du [-H | -L | -P] [-a | -s] [-cghkmrx] [file ...]\n"); exit(1); }