path: root/bdb/db/db_pr.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996, 1997, 1998, 1999, 2000
 *	Sleepycat Software.  All rights reserved.
 */

#include "db_config.h"

#ifndef lint
static const char revid[] = "$Id: db_pr.c,v 11.46 2001/01/22 17:25:06 krinsky Exp $";
#endif /* not lint */

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#endif

#include "db_int.h"
#include "db_page.h"
#include "btree.h"
#include "hash.h"
#include "qam.h"
#include "db_am.h"
#include "db_verify.h"

static int	 __db_bmeta __P((DB *, FILE *, BTMETA *, u_int32_t));
static int	 __db_hmeta __P((DB *, FILE *, HMETA *, u_int32_t));
static void	 __db_meta __P((DB *, DBMETA *, FILE *, FN const *, u_int32_t));
static const char	*__db_dbtype_to_string __P((DB *));
static void	 __db_prdb __P((DB *, FILE *, u_int32_t));
static FILE	*__db_prinit __P((FILE *));
static void	 __db_proff __P((void *));
static int	 __db_prtree __P((DB *, u_int32_t));
static void	 __db_psize __P((DB *));
static int	 __db_qmeta __P((DB *, FILE *, QMETA *, u_int32_t));

/*
 * 64K is the maximum page size, so by default we check for offsets larger
 * than that, and, where possible, we refine the test.
 */
#define	PSIZE_BOUNDARY	(64 * 1024 + 1)
static size_t set_psize = PSIZE_BOUNDARY;

static FILE *set_fp;				/* Output file descriptor. */

/*
 * __db_loadme --
 *	A nice place to put a breakpoint.
 *
 * PUBLIC: void __db_loadme __P((void));
 */
void
__db_loadme()
{
	getpid();
}

/*
 * __db_dump --
 *	Dump the tree to a file.
 *
 * PUBLIC: int __db_dump __P((DB *, char *, char *));
 */
int
__db_dump(dbp, op, name)
	DB *dbp;
	char *op, *name;
{
	FILE *fp, *save_fp;
	u_int32_t flags;

	COMPQUIET(save_fp, NULL);

	if (set_psize == PSIZE_BOUNDARY)
		__db_psize(dbp);

	if (name != NULL) {
		if ((fp = fopen(name, "w")) == NULL)
			return (__os_get_errno());
		save_fp = set_fp;
		set_fp = fp;
	} else
		fp = __db_prinit(NULL);

	for (flags = 0; *op != '\0'; ++op)
		switch (*op) {
		case 'a':
			LF_SET(DB_PR_PAGE);
			break;
		case 'h':
			break;
		case 'r':
			LF_SET(DB_PR_RECOVERYTEST);
			break;
		default:
			return (EINVAL);
		}

	__db_prdb(dbp, fp, flags);

	fprintf(fp, "%s\n", DB_LINE);

	(void)__db_prtree(dbp, flags);

	fflush(fp);

	if (name != NULL) {
		fclose(fp);
		set_fp = save_fp;
	}
	return (0);
}

/*
 * __db_prdb --
 *	Print out the DB structure information.
 */
static void
__db_prdb(dbp, fp, flags)
	DB *dbp;
	FILE *fp;
	u_int32_t flags;
{
	static const FN fn[] = {
		{ DB_AM_DISCARD,	"discard cached pages" },
		{ DB_AM_DUP,		"duplicates" },
		{ DB_AM_INMEM,		"in-memory" },
		{ DB_AM_PGDEF,		"default page size" },
		{ DB_AM_RDONLY,		"read-only" },
		{ DB_AM_SUBDB,		"multiple-databases" },
		{ DB_AM_SWAP,		"needswap" },
		{ DB_BT_RECNUM,		"btree:recnum" },
		{ DB_BT_REVSPLIT,	"btree:no reverse split" },
		{ DB_DBM_ERROR,		"dbm/ndbm error" },
		{ DB_OPEN_CALLED,	"DB->open called" },
		{ DB_RE_DELIMITER,	"recno:delimiter" },
		{ DB_RE_FIXEDLEN,	"recno:fixed-length" },
		{ DB_RE_PAD,		"recno:pad" },
		{ DB_RE_RENUMBER,	"recno:renumber" },
		{ DB_RE_SNAPSHOT,	"recno:snapshot" },
		{ 0,			NULL }
	};
	BTREE *bt;
	HASH *h;
	QUEUE *q;

	COMPQUIET(flags, 0);

	fprintf(fp,
	    "In-memory DB structure:\n%s: %#lx",
	    __db_dbtype_to_string(dbp), (u_long)dbp->flags);
	__db_prflags(dbp->flags, fn, fp);
	fprintf(fp, "\n");

	switch (dbp->type) {
	case DB_BTREE:
	case DB_RECNO:
		bt = dbp->bt_internal;
		fprintf(fp, "bt_meta: %lu bt_root: %lu\n",
		    (u_long)bt->bt_meta, (u_long)bt->bt_root);
		fprintf(fp, "bt_maxkey: %lu bt_minkey: %lu\n",
		    (u_long)bt->bt_maxkey, (u_long)bt->bt_minkey);
		fprintf(fp, "bt_compare: %#lx bt_prefix: %#lx\n",
		    (u_long)bt->bt_compare, (u_long)bt->bt_prefix);
		fprintf(fp, "bt_lpgno: %lu\n", (u_long)bt->bt_lpgno);
		if (dbp->type == DB_RECNO) {
			fprintf(fp,
		    "re_pad: %#lx re_delim: %#lx re_len: %lu re_source: %s\n",
			    (u_long)bt->re_pad, (u_long)bt->re_delim,
			    (u_long)bt->re_len,
			    bt->re_source == NULL ? "" : bt->re_source);
			fprintf(fp, "re_modified: %d re_eof: %d re_last: %lu\n",
			    bt->re_modified, bt->re_eof, (u_long)bt->re_last);
		}
		break;
	case DB_HASH:
		h = dbp->h_internal;
		fprintf(fp, "meta_pgno: %lu\n", (u_long)h->meta_pgno);
		fprintf(fp, "h_ffactor: %lu\n", (u_long)h->h_ffactor);
		fprintf(fp, "h_nelem: %lu\n", (u_long)h->h_nelem);
		fprintf(fp, "h_hash: %#lx\n", (u_long)h->h_hash);
		break;
	case DB_QUEUE:
		q = dbp->q_internal;
		fprintf(fp, "q_meta: %lu\n", (u_long)q->q_meta);
		fprintf(fp, "q_root: %lu\n", (u_long)q->q_root);
		fprintf(fp, "re_pad: %#lx re_len: %lu\n",
		    (u_long)q->re_pad, (u_long)q->re_len);
		fprintf(fp, "rec_page: %lu\n", (u_long)q->rec_page);
		fprintf(fp, "page_ext: %lu\n", (u_long)q->page_ext);
		break;
	default:
		break;
	}
}

/*
 * __db_prtree --
 *	Print out the entire tree.
 */
static int
__db_prtree(dbp, flags)
	DB *dbp;
	u_int32_t flags;
{
	PAGE *h;
	db_pgno_t i, last;
	int ret;

	if (set_psize == PSIZE_BOUNDARY)
		__db_psize(dbp);

	if (dbp->type == DB_QUEUE) {
		ret = __db_prqueue(dbp, flags);
		goto done;
	}

	/* Find out the page number of the last page in the database. */
	if ((ret = memp_fget(dbp->mpf, &last, DB_MPOOL_LAST, &h)) != 0)
		return (ret);
	if ((ret = memp_fput(dbp->mpf, h, 0)) != 0)
		return (ret);

	/* Dump each page. */
	for (i = 0; i <= last; ++i) {
		if ((ret = memp_fget(dbp->mpf, &i, 0, &h)) != 0)
			return (ret);
		(void)__db_prpage(dbp, h, flags);
		if ((ret = memp_fput(dbp->mpf, h, 0)) != 0)
			return (ret);
	}

done:
	(void)fflush(__db_prinit(NULL));
	return (0);
}

/*
 * __db_meta --
 *	Print out common metadata information.
 */
static void
__db_meta(dbp, dbmeta, fp, fn, flags)
	DB *dbp;
	DBMETA *dbmeta;
	FILE *fp;
	FN const *fn;
	u_int32_t flags;
{
	PAGE *h;
	int cnt;
	db_pgno_t pgno;
	u_int8_t *p;
	int ret;
	const char *sep;

	fprintf(fp, "\tmagic: %#lx\n", (u_long)dbmeta->magic);
	fprintf(fp, "\tversion: %lu\n", (u_long)dbmeta->version);
	fprintf(fp, "\tpagesize: %lu\n", (u_long)dbmeta->pagesize);
	fprintf(fp, "\ttype: %lu\n", (u_long)dbmeta->type);
	fprintf(fp, "\tkeys: %lu\trecords: %lu\n",
	    (u_long)dbmeta->key_count, (u_long)dbmeta->record_count);

	if (!LF_ISSET(DB_PR_RECOVERYTEST)) {
		/*
		 * If we're doing recovery testing, don't display the free
		 * list, it may have changed and that makes the dump diff
		 * not work.
		 */
		fprintf(fp, "\tfree list: %lu", (u_long)dbmeta->free);
		for (pgno = dbmeta->free,
		    cnt = 0, sep = ", "; pgno != PGNO_INVALID;) {
			if ((ret = memp_fget(dbp->mpf, &pgno, 0, &h)) != 0) {
				fprintf(fp,
			    "Unable to retrieve free-list page: %lu: %s\n",
				    (u_long)pgno, db_strerror(ret));
				break;
			}
			pgno = h->next_pgno;
			(void)memp_fput(dbp->mpf, h, 0);
			fprintf(fp, "%s%lu", sep, (u_long)pgno);
			if (++cnt % 10 == 0) {
				fprintf(fp, "\n");
				cnt = 0;
				sep = "\t";
			} else
				sep = ", ";
		}
		fprintf(fp, "\n");
	}

	if (fn != NULL) {
		fprintf(fp, "\tflags: %#lx", (u_long)dbmeta->flags);
		__db_prflags(dbmeta->flags, fn, fp);
		fprintf(fp, "\n");
	}

	fprintf(fp, "\tuid: ");
	for (p = (u_int8_t *)dbmeta->uid,
	    cnt = 0; cnt < DB_FILE_ID_LEN; ++cnt) {
		fprintf(fp, "%x", *p++);
		if (cnt < DB_FILE_ID_LEN - 1)
			fprintf(fp, " ");
	}
	fprintf(fp, "\n");
}

/*
 * __db_bmeta --
 *	Print out the btree meta-data page.
 */
static int
__db_bmeta(dbp, fp, h, flags)
	DB *dbp;
	FILE *fp;
	BTMETA *h;
	u_int32_t flags;
{
	static const FN mfn[] = {
		{ BTM_DUP,	"duplicates" },
		{ BTM_RECNO,	"recno" },
		{ BTM_RECNUM,	"btree:recnum" },
		{ BTM_FIXEDLEN,	"recno:fixed-length" },
		{ BTM_RENUMBER,	"recno:renumber" },
		{ BTM_SUBDB,	"multiple-databases" },
		{ 0,		NULL }
	};

	__db_meta(dbp, (DBMETA *)h, fp, mfn, flags);

	fprintf(fp, "\tmaxkey: %lu minkey: %lu\n",
	    (u_long)h->maxkey, (u_long)h->minkey);
	if (dbp->type == DB_RECNO)
		fprintf(fp, "\tre_len: %#lx re_pad: %lu\n",
		    (u_long)h->re_len, (u_long)h->re_pad);
	fprintf(fp, "\troot: %lu\n", (u_long)h->root);

	return (0);
}

/*
 * __db_hmeta --
 *	Print out the hash meta-data page.
 */
static int
__db_hmeta(dbp, fp, h, flags)
	DB *dbp;
	FILE *fp;
	HMETA *h;
	u_int32_t flags;
{
	static const FN mfn[] = {
		{ DB_HASH_DUP,	 "duplicates" },
		{ DB_HASH_SUBDB, "multiple-databases" },
		{ 0,		 NULL }
	};
	int i;

	__db_meta(dbp, (DBMETA *)h, fp, mfn, flags);

	fprintf(fp, "\tmax_bucket: %lu\n", (u_long)h->max_bucket);
	fprintf(fp, "\thigh_mask: %#lx\n", (u_long)h->high_mask);
	fprintf(fp, "\tlow_mask:  %#lx\n", (u_long)h->low_mask);
	fprintf(fp, "\tffactor: %lu\n", (u_long)h->ffactor);
	fprintf(fp, "\tnelem: %lu\n", (u_long)h->nelem);
	fprintf(fp, "\th_charkey: %#lx\n", (u_long)h->h_charkey);
	fprintf(fp, "\tspare points: ");
	for (i = 0; i < NCACHED; i++)
		fprintf(fp, "%lu ", (u_long)h->spares[i]);
	fprintf(fp, "\n");

	return (0);
}

/*
 * __db_qmeta --
 *	Print out the queue meta-data page.
 */
static int
__db_qmeta(dbp, fp, h, flags)
	DB *dbp;
	FILE *fp;
	QMETA *h;
	u_int32_t flags;
{
	__db_meta(dbp, (DBMETA *)h, fp, NULL, flags);

	fprintf(fp, "\tfirst_recno: %lu\n", (u_long)h->first_recno);
	fprintf(fp, "\tcur_recno: %lu\n", (u_long)h->cur_recno);
	fprintf(fp, "\tre_len: %#lx re_pad: %lu\n",
	    (u_long)h->re_len, (u_long)h->re_pad);
	fprintf(fp, "\trec_page: %lu\n", (u_long)h->rec_page);
	fprintf(fp, "\tpage_ext: %lu\n", (u_long)h->page_ext);

	return (0);
}

/*
 * __db_prnpage
 *	-- Print out a specific page.
 *
 * PUBLIC: int __db_prnpage __P((DB *, db_pgno_t));
 */
int
__db_prnpage(dbp, pgno)
	DB *dbp;
	db_pgno_t pgno;
{
	PAGE *h;
	int ret;

	if (set_psize == PSIZE_BOUNDARY)
		__db_psize(dbp);

	if ((ret = memp_fget(dbp->mpf, &pgno, 0, &h)) != 0)
		return (ret);

	ret = __db_prpage(dbp, h, DB_PR_PAGE);
	(void)fflush(__db_prinit(NULL));

	(void)memp_fput(dbp->mpf, h, 0);
	return (ret);
}

/*
 * __db_prpage
 *	-- Print out a page.
 *
 * PUBLIC: int __db_prpage __P((DB *, PAGE *, u_int32_t));
 */
int
__db_prpage(dbp, h, flags)
	DB *dbp;
	PAGE *h;
	u_int32_t flags;
{
	BINTERNAL *bi;
	BKEYDATA *bk;
	BTREE *t;
	FILE *fp;
	HOFFPAGE a_hkd;
	QAMDATA *qp, *qep;
	RINTERNAL *ri;
	db_indx_t dlen, len, i;
	db_pgno_t pgno;
	db_recno_t recno;
	int deleted, ret;
	const char *s;
	u_int32_t qlen;
	u_int8_t *ep, *hk, *p;
	void *sp;

	fp = __db_prinit(NULL);

	/*
	 * If we're doing recovery testing and this page is P_INVALID,
	 * assume it's a page that's on the free list, and don't display it.
	 */
	if (LF_ISSET(DB_PR_RECOVERYTEST) && TYPE(h) == P_INVALID)
		return (0);

	s = __db_pagetype_to_string(TYPE(h));
	if (s == NULL) {
		fprintf(fp, "ILLEGAL PAGE TYPE: page: %lu type: %lu\n",
		    (u_long)h->pgno, (u_long)TYPE(h));
		return (1);
	}

	/* Page number, page type. */
	fprintf(fp, "page %lu: %s level: %lu",
	    (u_long)h->pgno, s, (u_long)h->level);

	/* Record count. */
	if (TYPE(h) == P_IBTREE ||
	    TYPE(h) == P_IRECNO || (TYPE(h) == P_LRECNO &&
	    h->pgno == ((BTREE *)dbp->bt_internal)->bt_root))
		fprintf(fp, " records: %lu", (u_long)RE_NREC(h));

	/* LSN. */
	if (!LF_ISSET(DB_PR_RECOVERYTEST))
		fprintf(fp, " (lsn.file: %lu lsn.offset: %lu)\n",
		    (u_long)LSN(h).file, (u_long)LSN(h).offset);

	switch (TYPE(h)) {
	case P_BTREEMETA:
		return (__db_bmeta(dbp, fp, (BTMETA *)h, flags));
	case P_HASHMETA:
		return (__db_hmeta(dbp, fp, (HMETA *)h, flags));
	case P_QAMMETA:
		return (__db_qmeta(dbp, fp, (QMETA *)h, flags));
	case P_QAMDATA:				/* Should be meta->start. */
		if (!LF_ISSET(DB_PR_PAGE))
			return (0);

		qlen = ((QUEUE *)dbp->q_internal)->re_len;
		recno = (h->pgno - 1) * QAM_RECNO_PER_PAGE(dbp) + 1;
		i = 0;
		qep = (QAMDATA *)((u_int8_t *)h + set_psize - qlen);
		for (qp = QAM_GET_RECORD(dbp, h, i); qp < qep;
		    recno++, i++, qp = QAM_GET_RECORD(dbp, h, i)) {
			if (!F_ISSET(qp, QAM_SET))
				continue;

			fprintf(fp, "%s",
			    F_ISSET(qp, QAM_VALID) ? "\t" : "       D");
			fprintf(fp, "[%03lu] %4lu ",
			    (u_long)recno, (u_long)qp - (u_long)h);
			__db_pr(qp->data, qlen);
		}
		return (0);
	}

	/* LSN. */
	if (LF_ISSET(DB_PR_RECOVERYTEST))
		fprintf(fp, " (lsn.file: %lu lsn.offset: %lu)\n",
		    (u_long)LSN(h).file, (u_long)LSN(h).offset);

	t = dbp->bt_internal;

	s = "\t";
	if (TYPE(h) != P_IBTREE && TYPE(h) != P_IRECNO) {
		fprintf(fp, "%sprev: %4lu next: %4lu",
		    s, (u_long)PREV_PGNO(h), (u_long)NEXT_PGNO(h));
		s = " ";
	}
	if (TYPE(h) == P_OVERFLOW) {
		fprintf(fp, "%sref cnt: %4lu ", s, (u_long)OV_REF(h));
		__db_pr((u_int8_t *)h + P_OVERHEAD, OV_LEN(h));
		return (0);
	}
	fprintf(fp, "%sentries: %4lu", s, (u_long)NUM_ENT(h));
	fprintf(fp, " offset: %4lu\n", (u_long)HOFFSET(h));

	if (TYPE(h) == P_INVALID || !LF_ISSET(DB_PR_PAGE))
		return (0);

	ret = 0;
	for (i = 0; i < NUM_ENT(h); i++) {
		if (P_ENTRY(h, i) - (u_int8_t *)h < P_OVERHEAD ||
		    (size_t)(P_ENTRY(h, i) - (u_int8_t *)h) >= set_psize) {
			fprintf(fp,
			    "ILLEGAL PAGE OFFSET: indx: %lu of %lu\n",
			    (u_long)i, (u_long)h->inp[i]);
			ret = EINVAL;
			continue;
		}
		deleted = 0;
		switch (TYPE(h)) {
		case P_HASH:
		case P_IBTREE:
		case P_IRECNO:
			sp = P_ENTRY(h, i);
			break;
		case P_LBTREE:
			sp = P_ENTRY(h, i);
			deleted = i % 2 == 0 &&
			    B_DISSET(GET_BKEYDATA(h, i + O_INDX)->type);
			break;
		case P_LDUP:
		case P_LRECNO:
			sp = P_ENTRY(h, i);
			deleted = B_DISSET(GET_BKEYDATA(h, i)->type);
			break;
		default:
			fprintf(fp,
			    "ILLEGAL PAGE ITEM: %lu\n", (u_long)TYPE(h));
			ret = EINVAL;
			continue;
		}
		fprintf(fp, "%s", deleted ? "       D" : "\t");
		fprintf(fp, "[%03lu] %4lu ", (u_long)i, (u_long)h->inp[i]);
		switch (TYPE(h)) {
		case P_HASH:
			hk = sp;
			switch (HPAGE_PTYPE(hk)) {
			case H_OFFDUP:
				memcpy(&pgno,
				    HOFFDUP_PGNO(hk), sizeof(db_pgno_t));
				fprintf(fp,
				    "%4lu [offpage dups]\n", (u_long)pgno);
				break;
			case H_DUPLICATE:
				/*
				 * If this is the first item on a page, then
				 * we cannot figure out how long it is, so
				 * we only print the first one in the duplicate
				 * set.
				 */
				if (i != 0)
					len = LEN_HKEYDATA(h, 0, i);
				else
					len = 1;

				fprintf(fp, "Duplicates:\n");
				for (p = HKEYDATA_DATA(hk),
				    ep = p + len; p < ep;) {
					memcpy(&dlen, p, sizeof(db_indx_t));
					p += sizeof(db_indx_t);
					fprintf(fp, "\t\t");
					__db_pr(p, dlen);
					p += sizeof(db_indx_t) + dlen;
				}
				break;
			case H_KEYDATA:
				__db_pr(HKEYDATA_DATA(hk),
				    LEN_HKEYDATA(h, i == 0 ? set_psize : 0, i));
				break;
			case H_OFFPAGE:
				memcpy(&a_hkd, hk, HOFFPAGE_SIZE);
				fprintf(fp,
				    "overflow: total len: %4lu page: %4lu\n",
				    (u_long)a_hkd.tlen, (u_long)a_hkd.pgno);
				break;
			}
			break;
		case P_IBTREE:
			bi = sp;
			fprintf(fp, "count: %4lu pgno: %4lu type: %4lu",
			    (u_long)bi->nrecs, (u_long)bi->pgno,
			    (u_long)bi->type);
			switch (B_TYPE(bi->type)) {
			case B_KEYDATA:
				__db_pr(bi->data, bi->len);
				break;
			case B_DUPLICATE:
			case B_OVERFLOW:
				__db_proff(bi->data);
				break;
			default:
				fprintf(fp, "ILLEGAL BINTERNAL TYPE: %lu\n",
				    (u_long)B_TYPE(bi->type));
				ret = EINVAL;
				break;
			}
			break;
		case P_IRECNO:
			ri = sp;
			fprintf(fp, "entries %4lu pgno %4lu\n",
			    (u_long)ri->nrecs, (u_long)ri->pgno);
			break;
		case P_LBTREE:
		case P_LDUP:
		case P_LRECNO:
			bk = sp;
			switch (B_TYPE(bk->type)) {
			case B_KEYDATA:
				__db_pr(bk->data, bk->len);
				break;
			case B_DUPLICATE:
			case B_OVERFLOW:
				__db_proff(bk);
				break;
			default:
				fprintf(fp,
			    "ILLEGAL DUPLICATE/LBTREE/LRECNO TYPE: %lu\n",
				    (u_long)B_TYPE(bk->type));
				ret = EINVAL;
				break;
			}
			break;
		}
	}
	(void)fflush(fp);
	return (ret);
}

/*
 * __db_pr --
 *	Print out a data element.
 *
 * PUBLIC: void __db_pr __P((u_int8_t *, u_int32_t));
 */
void
__db_pr(p, len)
	u_int8_t *p;
	u_int32_t len;
{
	FILE *fp;
	u_int lastch;
	int i;

	fp = __db_prinit(NULL);

	fprintf(fp, "len: %3lu", (u_long)len);
	lastch = '.';
	if (len != 0) {
		fprintf(fp, " data: ");
		for (i = len <= 20 ? len : 20; i > 0; --i, ++p) {
			lastch = *p;
			if (isprint((int)*p) || *p == '\n')
				fprintf(fp, "%c", *p);
			else
				fprintf(fp, "0x%.2x", (u_int)*p);
		}
		if (len > 20) {
			fprintf(fp, "...");
			lastch = '.';
		}
	}
	if (lastch != '\n')
		fprintf(fp, "\n");
}

/*
 * __db_prdbt --
 *	Print out a DBT data element.
 *
 * PUBLIC: int __db_prdbt __P((DBT *, int, const char *, void *,
 * PUBLIC:     int (*)(void *, const void *), int, VRFY_DBINFO *));
 */
int
__db_prdbt(dbtp, checkprint, prefix, handle, callback, is_recno, vdp)
	DBT *dbtp;
	int checkprint;
	const char *prefix;
	void *handle;
	int (*callback) __P((void *, const void *));
	int is_recno;
	VRFY_DBINFO *vdp;
{
	static const char hex[] = "0123456789abcdef";
	db_recno_t recno;
	u_int32_t len;
	int ret;
#define	DBTBUFLEN	100
	char *p, *hp, buf[DBTBUFLEN], hbuf[DBTBUFLEN];

	if (vdp != NULL) {
		/*
		 * If vdp is non-NULL, we might be the first key in the
		 * "fake" subdatabase used for key/data pairs we can't
		 * associate with a known subdb.
		 *
		 * Check and clear the SALVAGE_PRINTHEADER flag;  if
		 * it was set, print a subdatabase header.
		 */
		if (F_ISSET(vdp, SALVAGE_PRINTHEADER))
			(void)__db_prheader(NULL, "__OTHER__", 0, 0,
			    handle, callback, vdp, 0);
		F_CLR(vdp, SALVAGE_PRINTHEADER);
		F_SET(vdp, SALVAGE_PRINTFOOTER);
	}

	/*
	 * !!!
	 * This routine is the routine that dumps out items in the format
	 * used by db_dump(1) and db_load(1).  This means that the format
	 * cannot change.
	 */
	if (prefix != NULL && (ret = callback(handle, prefix)) != 0)
		return (ret);
	if (is_recno) {
		/*
		 * We're printing a record number, and this has to be done
		 * in a platform-independent way.  So we use the numeral in
		 * straight ASCII.
		 */
		__ua_memcpy(&recno, dbtp->data, sizeof(recno));
		snprintf(buf, DBTBUFLEN, "%lu", (u_long)recno);

		/* If we're printing data as hex, print keys as hex too. */
		if (!checkprint) {
			for (len = strlen(buf), p = buf, hp = hbuf;
			    len-- > 0; ++p) {
				*hp++ = hex[(u_int8_t)(*p & 0xf0) >> 4];
				*hp++ = hex[*p & 0x0f];
			}
			*hp = '\0';
			ret = callback(handle, hbuf);
		} else
			ret = callback(handle, buf);

		if (ret != 0)
			return (ret);
	} else if (checkprint) {
		for (len = dbtp->size, p = dbtp->data; len--; ++p)
			if (isprint((int)*p)) {
				if (*p == '\\' &&
				    (ret = callback(handle, "\\")) != 0)
					return (ret);
				snprintf(buf, DBTBUFLEN, "%c", *p);
				if ((ret = callback(handle, buf)) != 0)
					return (ret);
			} else {
				snprintf(buf, DBTBUFLEN, "\\%c%c",
				    hex[(u_int8_t)(*p & 0xf0) >> 4],
				    hex[*p & 0x0f]);
				if ((ret = callback(handle, buf)) != 0)
					return (ret);
			}
	} else
		for (len = dbtp->size, p = dbtp->data; len--; ++p) {
			snprintf(buf, DBTBUFLEN, "%c%c",
			    hex[(u_int8_t)(*p & 0xf0) >> 4],
			    hex[*p & 0x0f]);
			if ((ret = callback(handle, buf)) != 0)
				return (ret);
		}

	return (callback(handle, "\n"));
}

/*
 * __db_proff --
 *	Print out an off-page element.
 */
static void
__db_proff(vp)
	void *vp;
{
	FILE *fp;
	BOVERFLOW *bo;

	fp = __db_prinit(NULL);

	bo = vp;
	switch (B_TYPE(bo->type)) {
	case B_OVERFLOW:
		fprintf(fp, "overflow: total len: %4lu page: %4lu\n",
		    (u_long)bo->tlen, (u_long)bo->pgno);
		break;
	case B_DUPLICATE:
		fprintf(fp, "duplicate: page: %4lu\n", (u_long)bo->pgno);
		break;
	}
}

/*
 * __db_prflags --
 *	Print out flags values.
 *
 * PUBLIC: void __db_prflags __P((u_int32_t, const FN *, FILE *));
 */
void
__db_prflags(flags, fn, fp)
	u_int32_t flags;
	FN const *fn;
	FILE *fp;
{
	const FN *fnp;
	int found;
	const char *sep;

	sep = " (";
	for (found = 0, fnp = fn; fnp->mask != 0; ++fnp)
		if (LF_ISSET(fnp->mask)) {
			fprintf(fp, "%s%s", sep, fnp->name);
			sep = ", ";
			found = 1;
		}
	if (found)
		fprintf(fp, ")");
}

/*
 * __db_prinit --
 *	Initialize tree printing routines.
 */
static FILE *
__db_prinit(fp)
	FILE *fp;
{
	if (set_fp == NULL)
		set_fp = fp == NULL ? stdout : fp;
	return (set_fp);
}

/*
 * __db_psize --
 *	Get the page size.
 */
static void
__db_psize(dbp)
	DB *dbp;
{
	DBMETA *mp;
	db_pgno_t pgno;

	set_psize = PSIZE_BOUNDARY - 1;

	pgno = PGNO_BASE_MD;
	if (memp_fget(dbp->mpf, &pgno, 0, &mp) != 0)
		return;

	switch (mp->magic) {
	case DB_BTREEMAGIC:
	case DB_HASHMAGIC:
	case DB_QAMMAGIC:
		set_psize = mp->pagesize;
		break;
	}
	(void)memp_fput(dbp->mpf, mp, 0);
}

/*
 * __db_dbtype_to_string --
 *	Return the name of the database type.
 */
static const char *
__db_dbtype_to_string(dbp)
	DB *dbp;
{
	switch (dbp->type) {
	case DB_BTREE:
		return ("btree");
	case DB_HASH:
		return ("hash");
		break;
	case DB_RECNO:
		return ("recno");
		break;
	case DB_QUEUE:
		return ("queue");
	default:
		return ("UNKNOWN TYPE");
	}
	/* NOTREACHED */
}

/*
 * __db_pagetype_to_string --
 *	Return the name of the specified page type.
 *
 * PUBLIC: const char *__db_pagetype_to_string __P((u_int32_t));
 */
const char *
__db_pagetype_to_string(type)
	u_int32_t type;
{
	char *s;

	s = NULL;
	switch (type) {
	case P_BTREEMETA:
		s = "btree metadata";
		break;
	case P_LDUP:
		s = "duplicate";
		break;
	case P_HASH:
		s = "hash";
		break;
	case P_HASHMETA:
		s = "hash metadata";
		break;
	case P_IBTREE:
		s = "btree internal";
		break;
	case P_INVALID:
		s = "invalid";
		break;
	case P_IRECNO:
		s = "recno internal";
		break;
	case P_LBTREE:
		s = "btree leaf";
		break;
	case P_LRECNO:
		s = "recno leaf";
		break;
	case P_OVERFLOW:
		s = "overflow";
		break;
	case P_QAMMETA:
		s = "queue metadata";
		break;
	case P_QAMDATA:
		s = "queue";
		break;
	default:
		/* Just return a NULL. */
		break;
	}
	return (s);
}

/*
 * __db_prheader --
 *	Write out header information in the format expected by db_load.
 *
 * PUBLIC: int	__db_prheader __P((DB *, char *, int, int, void *,
 * PUBLIC:     int (*)(void *, const void *), VRFY_DBINFO *, db_pgno_t));
 */
int
__db_prheader(dbp, subname, pflag, keyflag, handle, callback, vdp, meta_pgno)
	DB *dbp;
	char *subname;
	int pflag, keyflag;
	void *handle;
	int (*callback) __P((void *, const void *));
	VRFY_DBINFO *vdp;
	db_pgno_t meta_pgno;
{
	DB_BTREE_STAT *btsp;
	DB_ENV *dbenv;
	DB_HASH_STAT *hsp;
	DB_QUEUE_STAT *qsp;
	VRFY_PAGEINFO *pip;
	char *buf;
	int buflen, ret, t_ret;
	u_int32_t dbtype;

	btsp = NULL;
	hsp = NULL;
	qsp = NULL;
	ret = 0;
	buf = NULL;
	COMPQUIET(buflen, 0);

	if (dbp == NULL)
		dbenv = NULL;
	else
		dbenv = dbp->dbenv;

	/*
	 * If we've been passed a verifier statistics object, use
	 * that;  we're being called in a context where dbp->stat
	 * is unsafe.
	 */
	if (vdp != NULL) {
		if ((ret = __db_vrfy_getpageinfo(vdp, meta_pgno, &pip)) != 0)
			return (ret);
	} else
		pip = NULL;

	/*
	 * If dbp is NULL, we're being called from inside __db_prdbt,
	 * and this is a special subdatabase for "lost" items.  Make it a btree.
	 * Otherwise, set dbtype to the appropriate type for the specified
	 * meta page, or the type of the dbp.
	 */
	if (dbp == NULL)
		dbtype = DB_BTREE;
	else if (pip != NULL)
		switch (pip->type) {
		case P_BTREEMETA:
			if (F_ISSET(pip, VRFY_IS_RECNO))
				dbtype = DB_RECNO;
			else
				dbtype = DB_BTREE;
			break;
		case P_HASHMETA:
			dbtype = DB_HASH;
			break;
		default:
			/*
			 * If the meta page is of a bogus type, it's
			 * because we have a badly corrupt database.
			 * (We must be in the verifier for pip to be non-NULL.)
			 * Pretend we're a Btree and salvage what we can.
			 */
			DB_ASSERT(F_ISSET(dbp, DB_AM_VERIFYING));
			dbtype = DB_BTREE;
			break;
		}
	else
		dbtype = dbp->type;

	if ((ret = callback(handle, "VERSION=3\n")) != 0)
		goto err;
	if (pflag) {
		if ((ret = callback(handle, "format=print\n")) != 0)
			goto err;
	} else if ((ret = callback(handle, "format=bytevalue\n")) != 0)
		goto err;

	/*
	 * 64 bytes is long enough, as a minimum bound, for any of the
	 * fields besides subname.  Subname can be anything, and so
	 * 64 + subname is big enough for all the things we need to print here.
	 */
	buflen = 64 + ((subname != NULL) ? strlen(subname) : 0);
	if ((ret = __os_malloc(dbenv, buflen, NULL, &buf)) != 0)
		goto err;
	if (subname != NULL) {
		snprintf(buf, buflen, "database=%s\n", subname);
		if ((ret = callback(handle, buf)) != 0)
			goto err;
	}
	switch (dbtype) {
	case DB_BTREE:
		if ((ret = callback(handle, "type=btree\n")) != 0)
			goto err;
		if (pip != NULL) {
			if (F_ISSET(pip, VRFY_HAS_RECNUMS))
				if ((ret =
				    callback(handle, "recnum=1\n")) != 0)
					goto err;
			if (pip->bt_maxkey != 0) {
				snprintf(buf, buflen,
				    "bt_maxkey=%lu\n", (u_long)pip->bt_maxkey);
				if ((ret = callback(handle, buf)) != 0)
					goto err;
			}
			if (pip->bt_minkey != 0 &&
			    pip->bt_minkey != DEFMINKEYPAGE) {
				snprintf(buf, buflen,
				    "bt_minkey=%lu\n", (u_long)pip->bt_minkey);
				if ((ret = callback(handle, buf)) != 0)
					goto err;
			}
			break;
		}
		if ((ret = dbp->stat(dbp, &btsp, NULL, 0)) != 0) {
			dbp->err(dbp, ret, "DB->stat");
			goto err;
		}
		if (F_ISSET(dbp, DB_BT_RECNUM))
			if ((ret = callback(handle, "recnum=1\n")) != 0)
				goto err;
		if (btsp->bt_maxkey != 0) {
			snprintf(buf, buflen,
			    "bt_maxkey=%lu\n", (u_long)btsp->bt_maxkey);
			if ((ret = callback(handle, buf)) != 0)
				goto err;
		}
		if (btsp->bt_minkey != 0 && btsp->bt_minkey != DEFMINKEYPAGE) {
			snprintf(buf, buflen,
			    "bt_minkey=%lu\n", (u_long)btsp->bt_minkey);
			if ((ret = callback(handle, buf)) != 0)
				goto err;
		}
		break;
	case DB_HASH:
		if ((ret = callback(handle, "type=hash\n")) != 0)
			goto err;
		if (pip != NULL) {
			if (pip->h_ffactor != 0) {
				snprintf(buf, buflen,
				    "h_ffactor=%lu\n", (u_long)pip->h_ffactor);
				if ((ret = callback(handle, buf)) != 0)
					goto err;
			}
			if (pip->h_nelem != 0) {
				snprintf(buf, buflen,
				    "h_nelem=%lu\n", (u_long)pip->h_nelem);
				if ((ret = callback(handle, buf)) != 0)
					goto err;
			}
			break;
		}
		if ((ret = dbp->stat(dbp, &hsp, NULL, 0)) != 0) {
			dbp->err(dbp, ret, "DB->stat");
			goto err;
		}
		if (hsp->hash_ffactor != 0) {
			snprintf(buf, buflen,
			    "h_ffactor=%lu\n", (u_long)hsp->hash_ffactor);
			if ((ret = callback(handle, buf)) != 0)
				goto err;
		}
		if (hsp->hash_nelem != 0 || hsp->hash_nkeys != 0) {
			snprintf(buf, buflen, "h_nelem=%lu\n",
			    hsp->hash_nelem > hsp->hash_nkeys ?
			    (u_long)hsp->hash_nelem : (u_long)hsp->hash_nkeys);
			if ((ret = callback(handle, buf)) != 0)
				goto err;
		}
		break;
	case DB_QUEUE:
		if ((ret = callback(handle, "type=queue\n")) != 0)
			goto err;
		if (vdp != NULL) {
			snprintf(buf,
			    buflen, "re_len=%lu\n", (u_long)vdp->re_len);
			if ((ret = callback(handle, buf)) != 0)
				goto err;
			break;
		}
		if ((ret = dbp->stat(dbp, &qsp, NULL, 0)) != 0) {
			dbp->err(dbp, ret, "DB->stat");
			goto err;
		}
		snprintf(buf, buflen, "re_len=%lu\n", (u_long)qsp->qs_re_len);
		if (qsp->qs_re_pad != 0 && qsp->qs_re_pad != ' ')
			snprintf(buf, buflen, "re_pad=%#x\n", qsp->qs_re_pad);
		if ((ret = callback(handle, buf)) != 0)
			goto err;
		break;
	case DB_RECNO:
		if ((ret = callback(handle, "type=recno\n")) != 0)
			goto err;
		if (pip != NULL) {
			if (F_ISSET(pip, VRFY_IS_RRECNO))
				if ((ret =
				    callback(handle, "renumber=1\n")) != 0)
					goto err;
			if (pip->re_len > 0) {
				snprintf(buf, buflen,
				    "re_len=%lu\n", (u_long)pip->re_len);
				if ((ret = callback(handle, buf)) != 0)
					goto err;
			}
			break;
		}
		if ((ret = dbp->stat(dbp, &btsp, NULL, 0)) != 0) {
			dbp->err(dbp, ret, "DB->stat");
			goto err;
		}
		if (F_ISSET(dbp, DB_RE_RENUMBER))
			if ((ret = callback(handle, "renumber=1\n")) != 0)
				goto err;
		if (F_ISSET(dbp, DB_RE_FIXEDLEN)) {
			snprintf(buf, buflen,
			    "re_len=%lu\n", (u_long)btsp->bt_re_len);
			if ((ret = callback(handle, buf)) != 0)
				goto err;
		}
		if (btsp->bt_re_pad != 0 && btsp->bt_re_pad != ' ') {
			snprintf(buf, buflen, "re_pad=%#x\n", btsp->bt_re_pad);
			if ((ret = callback(handle, buf)) != 0)
				goto err;
		}
		break;
	case DB_UNKNOWN:
		DB_ASSERT(0);			/* Impossible. */
		__db_err(dbp->dbenv, "Impossible DB type in __db_prheader");
		ret = EINVAL;
		goto err;
	}

	if (pip != NULL) {
		if (F_ISSET(pip, VRFY_HAS_DUPS))
			if ((ret = callback(handle, "duplicates=1\n")) != 0)
				goto err;
		if (F_ISSET(pip, VRFY_HAS_DUPSORT))
			if ((ret = callback(handle, "dupsort=1\n")) != 0)
				goto err;
		/* We should handle page size. XXX */
	} else {
		if (F_ISSET(dbp, DB_AM_DUP))
			if ((ret = callback(handle, "duplicates=1\n")) != 0)
				goto err;
		if (F_ISSET(dbp, DB_AM_DUPSORT))
			if ((ret = callback(handle, "dupsort=1\n")) != 0)
				goto err;
		if (!F_ISSET(dbp, DB_AM_PGDEF)) {
			snprintf(buf, buflen,
			    "db_pagesize=%lu\n", (u_long)dbp->pgsize);
			if ((ret = callback(handle, buf)) != 0)
				goto err;
		}
	}

	if (keyflag && (ret = callback(handle, "keys=1\n")) != 0)
		goto err;

	ret = callback(handle, "HEADER=END\n");

err:	if (pip != NULL &&
	    (t_ret = __db_vrfy_putpageinfo(vdp, pip)) != 0 && ret == 0)
		ret = t_ret;
	if (btsp != NULL)
		__os_free(btsp, 0);
	if (hsp != NULL)
		__os_free(hsp, 0);
	if (qsp != NULL)
		__os_free(qsp, 0);
	if (buf != NULL)
		__os_free(buf, buflen);

	return (ret);
}

/*
 * __db_prfooter --
 *	Print the footer that marks the end of a DB dump.  This is trivial,
 *	but for consistency's sake we don't want to put its literal contents
 *	in multiple places.
 *
 * PUBLIC: int __db_prfooter __P((void *, int (*)(void *, const void *)));
 */
int
__db_prfooter(handle, callback)
	void *handle;
	int (*callback) __P((void *, const void *));
{
	return (callback(handle, "DATA=END\n"));
}