Merge "Lose du to toybox."

LOCAL_MODULE := libtoolbox_dd

include $(BUILD_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_SRC_FILES := upstream-netbsd/usr.bin/du/du.c

LOCAL_CFLAGS += $(common_cflags) -Dmain=du_main

LOCAL_MODULE := libtoolbox_du

include $(BUILD_STATIC_LIBRARY)

include $(CLEAR_VARS)

BSD_TOOLS := \

    dd \

    du \

OUR_TOOLS := \

    df \

/*	$NetBSD: du.c,v 1.36 2012/03/11 11:23:20 shattered 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 <sys/cdefs.h>

#ifndef lint

__COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\

 The Regents of the University of California.  All rights reserved.");

#endif /* not lint */

#ifndef lint

#if 0

static char sccsid[] = "@(#)du.c	8.5 (Berkeley) 5/4/95";

#else

__RCSID("$NetBSD: du.c,v 1.36 2012/03/11 11:23:20 shattered Exp $");

#endif

#endif /* not lint */

#include <sys/param.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <dirent.h>

#include <err.h>

#include <errno.h>

#include <fts.h>

#include <inttypes.h>

#include <util.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <limits.h>

/* Count inodes or file size */

#define	COUNT	(iflag ? 1 : p->fts_statp->st_blocks)

static int	linkchk(dev_t, ino_t);

static void	prstat(const char *, int64_t);

__dead static void	usage(void);

static int hflag, iflag;

static long blocksize;

int

main(int argc, char *argv[])

{

	FTS *fts;

	FTSENT *p;

	int64_t totalblocks;

	int ftsoptions, listfiles;

	int depth;

	int Hflag, Lflag, aflag, ch, cflag, dflag, gkmflag, nflag, rval, sflag;

	const char *noargv[2];

	Hflag = Lflag = aflag = cflag = dflag = gkmflag = nflag = sflag = 0;

	totalblocks = 0;

	ftsoptions = FTS_PHYSICAL;

	depth = INT_MAX;

	while ((ch = getopt(argc, argv, "HLPacd:ghikmnrsx")) != -1)

		switch (ch) {

		case 'H':

			Hflag = 1;

			Lflag = 0;

			break;

		case 'L':

			Lflag = 1;

			Hflag = 0;

			break;

		case 'P':

			Hflag = Lflag = 0;

			break;

		case 'a':

			aflag = 1;

			break;

		case 'c':

			cflag = 1;

			break;

		case 'd':

			dflag = 1;

			depth = atoi(optarg);

			if (depth < 0 || depth > SHRT_MAX) {

				warnx("invalid argument to option d: %s", 

					optarg);

				usage();

			}

			break;

		case 'g':

			blocksize = 1024 * 1024 * 1024;

			gkmflag = 1;

			break;

		case 'h':

			hflag = 1;

			break;

		case 'i':

			iflag = 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;

	}

	listfiles = 0;

	if (aflag) {

		if (sflag || dflag)

			usage();

		listfiles = 1;

	} else if (sflag) {

		if (dflag)

			usage();

		depth = 0;

	}

	if (!*argv) {

		noargv[0] = ".";

		noargv[1] = NULL;

		argv = __UNCONST(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;) {

#ifndef __ANDROID__

		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;

				}

			}

		}

#endif

		switch (p->fts_info) {

		case FTS_D:			/* Ignore. */

			break;

		case FTS_DP:

			p->fts_parent->fts_number += 

			    p->fts_number += COUNT;

			if (cflag)

				totalblocks += COUNT;

			/*

			 * 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 (p->fts_level <= depth

			    || (!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, COUNT);

			p->fts_parent->fts_number += COUNT;

			if (cflag)

				totalblocks += COUNT;

		}

	}

	if (errno)

		err(1, "fts_read");

	if (cflag)

		prstat("total", totalblocks);

	exit(rval);

}

static void

prstat(const char *fname, int64_t blocks)

{

	if (iflag) {

		(void)printf("%" PRId64 "\t%s\n", blocks, fname);

		return;

	}

	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("%" PRId64 "\t%s\n",

		    howmany(blocks, (int64_t)blocksize),

		    fname);

}

static 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;

}

static void

usage(void)

{

	(void)fprintf(stderr,

		"usage: du [-H | -L | -P] [-a | -d depth | -s] [-cghikmnrx] [file ...]\n");

	exit(1);

}