Removed sdbm and it tests

7 files changed, 0 insertions, 3006 deletions

diff --git a/ext/sdbm/_sdbm.c b/ext/sdbm/_sdbm.c
deleted file mode 100644
index 3a42b0e569..0000000000
--- a/ext/sdbm/_sdbm.c
+++ /dev/null
@@ -1,952 +0,0 @@
-/*
- * sdbm - ndbm work-alike hashed database library
- * based on Per-Aake Larson's Dynamic Hashing algorithms. BIT 18 (1978).
- * author: oz@nexus.yorku.ca
- * status: public domain.
- *
- * core routines
- */
-
-#include "ruby/ruby.h"
-
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-
-#include "sdbm.h"
-
-/*
- * sdbm - ndbm work-alike hashed database library
- * tuning and portability constructs [not nearly enough]
- * author: oz@nexus.yorku.ca
- */
-
-#define BYTESIZ		8
-
-#ifdef BSD42
-#define SEEK_SET	L_SET
-#define	memset(s,c,n)	bzero((s), (n))		/* only when c is zero */
-#define	memcpy(s1,s2,n)	bcopy((s2), (s1), (n))
-#define	memcmp(s1,s2,n)	bcmp((s1),(s2),(n))
-#endif
-
-/*
- * important tuning parms (hah)
- */
-
-#ifndef SEEDUPS
-#define SEEDUPS 1	/* always detect duplicates */
-#endif
-#ifndef BADMESS
-#define BADMESS 1	/* generate a message for worst case:
-			   cannot make room after SPLTMAX splits */
-#endif
-
-/*
- * misc
- */
-#ifdef DEBUG
-#define debug(x)	printf x
-#else
-#define debug(x)
-#endif
-
-#ifdef BIG_E
-#define GET_SHORT(p, i)	(((unsigned)((unsigned char *)(p))[(i)*2] << 8) + (((unsigned char *)(p))[(i)*2 + 1]))
-#define PUT_SHORT(p, i, s) (((unsigned char *)(p))[(i)*2] = (unsigned char)((s) >> 8), ((unsigned char *)(p))[(i)*2 + 1] = (unsigned char)(s))
-#else
-#define GET_SHORT(p, i)	((p)[(i)])
-#define PUT_SHORT(p, i, s)	((p)[(i)] = (s))
-#endif
-
-/*#include "pair.h"*/
-static int   fitpair proto((char *, int));
-static void  putpair proto((char *, datum, datum));
-static datum getpair proto((char *, datum));
-static int   delpair proto((char *, datum));
-static int   chkpage proto((char *));
-static datum getnkey proto((char *, int));
-static void  splpage proto((char *, char *, long));
-#if SEEDUPS
-static int   duppair proto((char *, datum));
-#endif
-
-#include <stdio.h>
-#include <stdlib.h>
-#ifdef DOSISH
-#include <io.h>
-#endif
-#include <sys/types.h>
-#include <sys/stat.h>
-#ifdef BSD42
-#include <sys/file.h>
-#else
-#include <fcntl.h>
-/*#include <memory.h>*/
-#endif
-#ifndef O_BINARY
-#define O_BINARY	0
-#endif
-
-#include <errno.h>
-#ifndef EPERM
-#define EPERM	EACCES
-#endif
-#include <string.h>
-
-#ifdef __STDC__
-#include <stddef.h>
-#endif
-
-#ifndef NULL
-#define NULL	0
-#endif
-
-/*
- * externals
- */
-#if !defined(__sun) && !defined(_WIN32) && !defined(__CYGWIN__) && !defined(errno)
-extern int errno;
-#endif
-
-/*
- * forward
- */
-static int getdbit proto((DBM *, long));
-static int setdbit proto((DBM *, long));
-static int getpage proto((DBM *, long));
-static datum getnext proto((DBM *));
-static int makroom proto((DBM *, long, int));
-
-/*
- * useful macros
- */
-#define bad(x)		((x).dptr == NULL || (x).dsize < 0)
-#define exhash(item)	sdbm_hash((item).dptr, (item).dsize)
-#define ioerr(db)	((db)->flags |= DBM_IOERR)
-
-#define OFF_PAG(off)	(long) (off) * PBLKSIZ
-#define OFF_DIR(off)	(long) (off) * DBLKSIZ
-
-static long masks[] = {
-	000000000000L, 000000000001L, 000000000003L,
-	000000000007L, 000000000017L, 000000000037L,
-	000000000077L, 000000000177L, 000000000377L,
-	000000000777L, 000000001777L, 000000003777L,
-	000000007777L, 000000017777L, 000000037777L,
-	000000077777L, 000000177777L, 000000377777L,
-	000000777777L, 000001777777L, 000003777777L,
-	000007777777L, 000017777777L, 000037777777L,
-	000077777777L, 000177777777L, 000377777777L,
-	000777777777L, 001777777777L, 003777777777L,
-	007777777777L, 017777777777L
-};
-
-datum nullitem = {NULL, 0};
-
-DBM *
-sdbm_open(register char *file, register int flags, register int mode)
-{
-	register DBM *db;
-	register char *dirname;
-	register char *pagname;
-	register size_t n;
-
-	if (file == NULL || !*file)
-		return errno = EINVAL, (DBM *) NULL;
-/*
- * need space for two separate filenames
- */
-	n = strlen(file) * 2 + strlen(DIRFEXT) + strlen(PAGFEXT) + 2;
-
-	if ((dirname = malloc(n)) == NULL)
-		return errno = ENOMEM, (DBM *) NULL;
-/*
- * build the file names
- */
-	dirname = strcat(strcpy(dirname, file), DIRFEXT);
-	pagname = strcpy(dirname + strlen(dirname) + 1, file);
-	pagname = strcat(pagname, PAGFEXT);
-
-	db = sdbm_prep(dirname, pagname, flags, mode);
-	free((char *) dirname);
-	return db;
-}
-
-static int
-fd_set_cloexec(int fd)
-{
-	/* MinGW don't have F_GETFD and FD_CLOEXEC.  [ruby-core:40281] */
-#ifdef F_GETFD
-	int flags, ret;
-	flags = fcntl(fd, F_GETFD); /* should not fail except EBADF. */
-	if (flags == -1) {
-		return -1;
-	}
-	if (2 < fd) {
-		if (!(flags & FD_CLOEXEC)) {
-			flags |= FD_CLOEXEC;
-			ret = fcntl(fd, F_SETFD, flags);
-			if (ret == -1) {
-				return -1;
-			}
-		}
-	}
-#endif
-	return 0;
-}
-
-DBM *
-sdbm_prep(char *dirname, char *pagname, int flags, int mode)
-{
-	register DBM *db;
-	struct stat dstat;
-
-	if ((db = (DBM *) malloc(sizeof(DBM))) == NULL)
-		return errno = ENOMEM, (DBM *) NULL;
-
-        db->pagf = -1;
-        db->dirf = -1;
-        db->flags = 0;
-        db->hmask = 0;
-        db->blkptr = 0;
-        db->keyptr = 0;
-/*
- * adjust user flags so that WRONLY becomes RDWR,
- * as required by this package. Also set our internal
- * flag for RDONLY.
- */
-	if (flags & O_WRONLY)
-		flags = (flags & ~O_WRONLY) | O_RDWR;
-	if (flags & O_RDONLY)
-		db->flags = DBM_RDONLY;
-/*
- * open the files in sequence, and stat the dirfile.
- * If we fail anywhere, undo everything, return NULL.
- */
-	flags |= O_BINARY;
-#ifdef O_CLOEXEC
-        flags |= O_CLOEXEC;
-#endif
-
-	if ((db->pagf = open(pagname, flags, mode)) == -1) goto err;
-        if (fd_set_cloexec(db->pagf) == -1) goto err;
-        if ((db->dirf = open(dirname, flags, mode)) == -1) goto err;
-        if (fd_set_cloexec(db->dirf) == -1) goto err;
-/*
- * need the dirfile size to establish max bit number.
- */
-        if (fstat(db->dirf, &dstat) == -1) goto err;
-/*
- * zero size: either a fresh database, or one with a single,
- * unsplit data page: dirpage is all zeros.
- */
-        db->dirbno = (!dstat.st_size) ? 0 : -1;
-        db->pagbno = -1;
-        db->maxbno = dstat.st_size * (long) BYTESIZ;
-
-        (void) memset(db->pagbuf, 0, PBLKSIZ);
-        (void) memset(db->dirbuf, 0, DBLKSIZ);
-/*
- * success
- */
-        return db;
-
-    err:
-        if (db->pagf != -1)
-                (void) close(db->pagf);
-        if (db->dirf != -1)
-                (void) close(db->dirf);
-	free((char *) db);
-	return (DBM *) NULL;
-}
-
-void
-sdbm_close(register DBM *db)
-{
-	if (db == NULL)
-		errno = EINVAL;
-	else {
-		(void) close(db->dirf);
-		(void) close(db->pagf);
-		free((char *) db);
-	}
-}
-
-datum
-sdbm_fetch(register DBM *db, datum key)
-{
-	if (db == NULL || bad(key))
-		return errno = EINVAL, nullitem;
-
-	if (getpage(db, exhash(key)))
-		return getpair(db->pagbuf, key);
-
-	return ioerr(db), nullitem;
-}
-
-int
-sdbm_delete(register DBM *db, datum key)
-{
-	if (db == NULL || bad(key))
-		return errno = EINVAL, -1;
-	if (sdbm_rdonly(db))
-		return errno = EPERM, -1;
-
-	if (getpage(db, exhash(key))) {
-		if (!delpair(db->pagbuf, key))
-			return -1;
-/*
- * update the page file
- */
-		if (lseek(db->pagf, OFF_PAG(db->pagbno), SEEK_SET) < 0
-		    || write(db->pagf, db->pagbuf, PBLKSIZ) < 0)
-			return ioerr(db), -1;
-
-		return 0;
-	}
-
-	return ioerr(db), -1;
-}
-
-int
-sdbm_store(register DBM *db, datum key, datum val, int flags)
-{
-	int need;
-	register long hash;
-
-	if (db == NULL || bad(key))
-		return errno = EINVAL, -1;
-	if (sdbm_rdonly(db))
-		return errno = EPERM, -1;
-
-	need = key.dsize + val.dsize;
-/*
- * is the pair too big (or too small) for this database ??
- */
-	if (need < 0 || need > PAIRMAX)
-		return errno = EINVAL, -1;
-
-	if (getpage(db, (hash = exhash(key)))) {
-/*
- * if we need to replace, delete the key/data pair
- * first. If it is not there, ignore.
- */
-		if (flags == DBM_REPLACE)
-			(void) delpair(db->pagbuf, key);
-#if SEEDUPS
-		else if (duppair(db->pagbuf, key))
-			return 1;
-#endif
-/*
- * if we do not have enough room, we have to split.
- */
-		if (!fitpair(db->pagbuf, need))
-			if (!makroom(db, hash, need))
-				return ioerr(db), -1;
-/*
- * we have enough room or split is successful. insert the key,
- * and update the page file.
- */
-		(void) putpair(db->pagbuf, key, val);
-
-		if (lseek(db->pagf, OFF_PAG(db->pagbno), SEEK_SET) < 0
-		    || write(db->pagf, db->pagbuf, PBLKSIZ) < 0)
-			return ioerr(db), -1;
-	/*
-	 * success
-	 */
-		return 0;
-	}
-
-	return ioerr(db), -1;
-}
-
-/*
- * makroom - make room by splitting the overfull page
- * this routine will attempt to make room for SPLTMAX times before
- * giving up.
- */
-static int
-makroom(register DBM *db, long int hash, int need)
-{
-	long newp;
-	char twin[PBLKSIZ];
-#if defined _WIN32
-	char zer[PBLKSIZ];
-	long oldtail;
-#endif
-	char *pag = db->pagbuf;
-	char *new = twin;
-	register int smax = SPLTMAX;
-
-	do {
-/*
- * split the current page
- */
-		(void) splpage(pag, new, db->hmask + 1);
-/*
- * address of the new page
- */
-		newp = (hash & db->hmask) | (db->hmask + 1);
-		debug(("newp: %ld\n", newp));
-/*
- * write delay, read avoidance/cache shuffle:
- * select the page for incoming pair: if key is to go to the new page,
- * write out the previous one, and copy the new one over, thus making
- * it the current page. If not, simply write the new page, and we are
- * still looking at the page of interest. current page is not updated
- * here, as sdbm_store will do so, after it inserts the incoming pair.
- */
-
-#if defined _WIN32
-		/*
-		 * Fill hole with 0 if made it.
-		 * (hole is NOT read as 0)
-		 */
-		oldtail = lseek(db->pagf, 0L, SEEK_END);
-		memset(zer, 0, PBLKSIZ);
-		while (OFF_PAG(newp) > oldtail) {
-			if (lseek(db->pagf, 0L, SEEK_END) < 0 ||
-			    write(db->pagf, zer, PBLKSIZ) < 0) {
-
-				return 0;
-			}
-			oldtail += PBLKSIZ;
-		}
-#endif
-
-		if (hash & (db->hmask + 1)) {
-			if (lseek(db->pagf, OFF_PAG(db->pagbno), SEEK_SET) < 0
-			    || write(db->pagf, db->pagbuf, PBLKSIZ) < 0)
-				return 0;
-			db->pagbno = newp;
-			(void) memcpy(pag, new, PBLKSIZ);
-		}
-		else if (lseek(db->pagf, OFF_PAG(newp), SEEK_SET) < 0
-			 || write(db->pagf, new, PBLKSIZ) < 0)
-			return 0;
-
-		if (!setdbit(db, db->curbit))
-			return 0;
-/*
- * see if we have enough room now
- */
-		if (fitpair(pag, need))
-			return 1;
-/*
- * try again... update curbit and hmask as getpage would have
- * done. because of our update of the current page, we do not
- * need to read in anything. BUT we have to write the current
- * [deferred] page out, as the window of failure is too great.
- */
-		db->curbit = 2 * db->curbit +
-			((hash & (db->hmask + 1)) ? 2 : 1);
-		db->hmask |= (db->hmask + 1);
-
-		if (lseek(db->pagf, OFF_PAG(db->pagbno), SEEK_SET) < 0
-		    || write(db->pagf, db->pagbuf, PBLKSIZ) < 0)
-			return 0;
-
-	} while (--smax);
-/*
- * if we are here, this is real bad news. After SPLTMAX splits,
- * we still cannot fit the key. say goodnight.
- */
-#if BADMESS
-	(void) (write(2, "sdbm: cannot insert after SPLTMAX attempts.\n", 44) < 0);
-#endif
-	return 0;
-
-}
-
-/*
- * the following two routines will break if
- * deletions aren't taken into account. (ndbm bug)
- */
-datum
-sdbm_firstkey(register DBM *db)
-{
-	if (db == NULL)
-		return errno = EINVAL, nullitem;
-/*
- * start at page 0
- */
-	(void) memset(db->pagbuf, 0, PBLKSIZ);
-	if (lseek(db->pagf, OFF_PAG(0), SEEK_SET) < 0
-	    || read(db->pagf, db->pagbuf, PBLKSIZ) < 0)
-		return ioerr(db), nullitem;
-	db->pagbno = 0;
-	db->blkptr = 0;
-	db->keyptr = 0;
-
-	return getnext(db);
-}
-
-datum
-sdbm_nextkey(register DBM *db)
-{
-	if (db == NULL)
-		return errno = EINVAL, nullitem;
-	return getnext(db);
-}
-
-/*
- * all important binary trie traversal
- */
-static int
-getpage(register DBM *db, register long int hash)
-{
-	register int hbit;
-	register long dbit;
-	register long pagb;
-
-	dbit = 0;
-	hbit = 0;
-	while (dbit < db->maxbno && getdbit(db, dbit))
-		dbit = 2 * dbit + ((hash & ((long) 1 << hbit++)) ? 2 : 1);
-
-	debug(("dbit: %ld...", dbit));
-
-	db->curbit = dbit;
-	db->hmask = masks[hbit];
-
-	pagb = hash & db->hmask;
-/*
- * see if the block we need is already in memory.
- * note: this lookaside cache has about 10% hit rate.
- */
-	if (pagb != db->pagbno) {
-/*
- * note: here, we assume a "hole" is read as 0s.
- * if not, must zero pagbuf first.
- */
-		(void) memset(db->pagbuf, 0, PBLKSIZ);
-
-		if (lseek(db->pagf, OFF_PAG(pagb), SEEK_SET) < 0
-		    || read(db->pagf, db->pagbuf, PBLKSIZ) < 0)
-			return 0;
-		if (!chkpage(db->pagbuf)) {
-			return 0;
-		}
-		db->pagbno = pagb;
-
-		debug(("pag read: %ld\n", pagb));
-	}
-	return 1;
-}
-
-static int
-getdbit(register DBM *db, register long int dbit)
-{
-	register long c;
-	register long dirb;
-
-	c = dbit / BYTESIZ;
-	dirb = c / DBLKSIZ;
-
-	if (dirb != db->dirbno) {
-		if (lseek(db->dirf, OFF_DIR(dirb), SEEK_SET) < 0
-		    || read(db->dirf, db->dirbuf, DBLKSIZ) < 0)
-			return 0;
-		db->dirbno = dirb;
-
-		debug(("dir read: %ld\n", dirb));
-	}
-
-	return db->dirbuf[c % DBLKSIZ] & (1 << (dbit % BYTESIZ));
-}
-
-static int
-setdbit(register DBM *db, register long int dbit)
-{
-	register long c;
-	register long dirb;
-
-	c = dbit / BYTESIZ;
-	dirb = c / DBLKSIZ;
-
-	if (dirb != db->dirbno) {
-		if (lseek(db->dirf, OFF_DIR(dirb), SEEK_SET) < 0
-		    || read(db->dirf, db->dirbuf, DBLKSIZ) < 0)
-			return 0;
-		db->dirbno = dirb;
-
-		debug(("dir read: %ld\n", dirb));
-	}
-
-	db->dirbuf[c % DBLKSIZ] |= (1 << (dbit % BYTESIZ));
-
-	if (dbit >= db->maxbno)
-		db->maxbno += (long) DBLKSIZ * BYTESIZ;
-
-	if (lseek(db->dirf, OFF_DIR(dirb), SEEK_SET) < 0
-	    || write(db->dirf, db->dirbuf, DBLKSIZ) < 0)
-		return 0;
-
-	return 1;
-}
-
-/*
- * getnext - get the next key in the page, and if done with
- * the page, try the next page in sequence
- */
-static datum
-getnext(register DBM *db)
-{
-	datum key;
-
-	for (;;) {
-		db->keyptr++;
-		key = getnkey(db->pagbuf, db->keyptr);
-		if (key.dptr != NULL)
-			return key;
-/*
- * we either run out, or there is nothing on this page..
- * try the next one... If we lost our position on the
- * file, we will have to seek.
- */
-		db->keyptr = 0;
-		if (db->pagbno != db->blkptr++)
-			if (lseek(db->pagf, OFF_PAG(db->blkptr), SEEK_SET) < 0)
-				break;
-		db->pagbno = db->blkptr;
-		if (read(db->pagf, db->pagbuf, PBLKSIZ) <= 0)
-			break;
-		if (!chkpage(db->pagbuf)) {
-			break;
-		}
-	}
-
-	return ioerr(db), nullitem;
-}
-
-/* pair.c */
-/*
- * sdbm - ndbm work-alike hashed database library
- * based on Per-Aake Larson's Dynamic Hashing algorithms. BIT 18 (1978).
- * author: oz@nexus.yorku.ca
- * status: public domain.
- *
- * page-level routines
- */
-
-#ifndef BSD42
-/*#include <memory.h>*/
-#endif
-
-#define exhash(item)	sdbm_hash((item).dptr, (item).dsize)
-
-/*
- * forward
- */
-static int seepair proto((char *, int, char *, int));
-
-/*
- * page format:
- *	+------------------------------+
- * ino	| n | keyoff | datoff | keyoff |
- * 	+------------+--------+--------+
- *	| datoff | - - - ---->	       |
- *	+--------+---------------------+
- *	|	 F R E E A R E A       |
- *	+--------------+---------------+
- *	|  <---- - - - | data          |
- *	+--------+-----+----+----------+
- *	|  key   | data     | key      |
- *	+--------+----------+----------+
- *
- * calculating the offsets for free area:  if the number
- * of entries (ino[0]) is zero, the offset to the END of
- * the free area is the block size. Otherwise, it is the
- * nth (ino[ino[0]]) entry's offset.
- */
-
-static int
-fitpair(char *pag, int need)
-{
-	register int n;
-	register int off;
-	register int free;
-	register short *ino = (short *) pag;
-
-	off = ((n = GET_SHORT(ino,0)) > 0) ? GET_SHORT(ino,n) : PBLKSIZ;
-	free = off - (n + 1) * (int)sizeof(short);
-	need += 2 * (int)sizeof(short);
-
-	debug(("free %d need %d\n", free, need));
-
-	return need <= free;
-}
-
-static void
-putpair(char *pag, datum key, datum val)
-{
-	register int n;
-	register int off;
-	register short *ino = (short *) pag;
-
-	off = ((n = GET_SHORT(ino,0)) > 0) ? GET_SHORT(ino,n) : PBLKSIZ;
-/*
- * enter the key first
- */
-	off -= key.dsize;
-	if (key.dsize)
-		(void) memcpy(pag + off, key.dptr, key.dsize);
-	PUT_SHORT(ino,n + 1,off);
-/*
- * now the data
- */
-	off -= val.dsize;
-	if (val.dsize)
-		(void) memcpy(pag + off, val.dptr, val.dsize);
-	PUT_SHORT(ino,n + 2,off);
-/*
- * adjust item count
- */
-	PUT_SHORT(ino,0,GET_SHORT(ino,0) + 2);
-}
-
-static datum
-getpair(char *pag, datum key)
-{
-	register int i;
-	register int n;
-	datum val;
-	register short *ino = (short *) pag;
-
-	if ((n = GET_SHORT(ino,0)) == 0)
-		return nullitem;
-
-	if ((i = seepair(pag, n, key.dptr, key.dsize)) == 0)
-		return nullitem;
-
-	val.dptr = pag + GET_SHORT(ino,i + 1);
-	val.dsize = GET_SHORT(ino,i) - GET_SHORT(ino,i + 1);
-	return val;
-}
-
-#if SEEDUPS
-static int
-duppair(char *pag, datum key)
-{
-	register short *ino = (short *) pag;
-	return GET_SHORT(ino,0) > 0 &&
-		   seepair(pag, GET_SHORT(ino,0), key.dptr, key.dsize) > 0;
-}
-#endif
-
-static datum
-getnkey(char *pag, int num)
-{
-	datum key;
-	register int off;
-	register short *ino = (short *) pag;
-
-	num = num * 2 - 1;
-	if (GET_SHORT(ino,0) == 0 || num > GET_SHORT(ino,0))
-		return nullitem;
-
-	off = (num > 1) ? GET_SHORT(ino,num - 1) : PBLKSIZ;
-
-	key.dptr = pag + GET_SHORT(ino,num);
-	key.dsize = off - GET_SHORT(ino,num);
-
-	return key;
-}
-
-static int
-delpair(char *pag, datum key)
-{
-	register int n;
-	register int i;
-	register short *ino = (short *) pag;
-
-	if ((n = GET_SHORT(ino,0)) == 0)
-		return 0;
-
-	if ((i = seepair(pag, n, key.dptr, key.dsize)) == 0)
-		return 0;
-/*
- * found the key. if it is the last entry
- * [i.e. i == n - 1] we just adjust the entry count.
- * hard case: move all data down onto the deleted pair,
- * shift offsets onto deleted offsets, and adjust them.
- * [note: 0 < i < n]
- */
-	if (i < n - 1) {
-		register int m;
-		register char *dst = pag + (i == 1 ? PBLKSIZ : GET_SHORT(ino,i - 1));
-		register char *src = pag + GET_SHORT(ino,i + 1);
-		register ptrdiff_t   zoo = dst - src;
-
-		debug(("free-up %"PRIdPTRDIFF" ", zoo));
-/*
- * shift data/keys down
- */
-		m = GET_SHORT(ino,i + 1) - GET_SHORT(ino,n);
-#ifdef DUFF
-#define MOVB 	*--dst = *--src
-
-		if (m > 0) {
-			register int loop = (m + 8 - 1) >> 3;
-
-			switch (m & (8 - 1)) {
-			case 0:	do {
-				MOVB;	case 7:	MOVB;
-			case 6:	MOVB;	case 5:	MOVB;
-			case 4:	MOVB;	case 3:	MOVB;
-			case 2:	MOVB;	case 1:	MOVB;
-				} while (--loop);
-			}
-		}
-#else
-#ifdef MEMMOVE
-		memmove(dst-m, src-m, m);
-#else
-		while (m--)
-			*--dst = *--src;
-#endif
-#endif
-/*
- * adjust offset index up
- */
-		while (i < n - 1) {
-			PUT_SHORT(ino,i, GET_SHORT(ino,i + 2) + zoo);
-			i++;
-		}
-	}
-	PUT_SHORT(ino, 0, GET_SHORT(ino, 0) - 2);
-	return 1;
-}
-
-/*
- * search for the key in the page.
- * return offset index in the range 0 < i < n.
- * return 0 if not found.
- */
-static int
-seepair(char *pag, register int n, register char *key, register int siz)
-{
-	register int i;
-	register int off = PBLKSIZ;
-	register short *ino = (short *) pag;
-
-	for (i = 1; i < n; i += 2) {
-		if (siz == off - GET_SHORT(ino,i) &&
-		    memcmp(key, pag + GET_SHORT(ino,i), siz) == 0)
-			return i;
-		off = GET_SHORT(ino,i + 1);
-	}
-	return 0;
-}
-
-static void
-splpage(char *pag, char *new, long int sbit)
-{
-	datum key;
-	datum val;
-
-	register int n;
-	register int off = PBLKSIZ;
-	char cur[PBLKSIZ];
-	register short *ino = (short *) cur;
-
-	(void) memcpy(cur, pag, PBLKSIZ);
-	(void) memset(pag, 0, PBLKSIZ);
-	(void) memset(new, 0, PBLKSIZ);
-
-	n = GET_SHORT(ino,0);
-	for (ino++; n > 0; ino += 2) {
-		key.dptr = cur + GET_SHORT(ino,0);
-		key.dsize = off - GET_SHORT(ino,0);
-		val.dptr = cur + GET_SHORT(ino,1);
-		val.dsize = GET_SHORT(ino,0) - GET_SHORT(ino,1);
-/*
- * select the page pointer (by looking at sbit) and insert
- */
-		(void) putpair((exhash(key) & sbit) ? new : pag, key, val);
-
-		off = GET_SHORT(ino,1);
-		n -= 2;
-	}
-
-	debug(("%d split %d/%d\n", ((short *) cur)[0] / 2,
-	       ((short *) new)[0] / 2,
-	       ((short *) pag)[0] / 2));
-}
-
-/*
- * check page sanity:
- * number of entries should be something
- * reasonable, and all offsets in the index should be in order.
- * this could be made more rigorous.
- */
-static int
-chkpage(char *pag)
-{
-	register int n;
-	register int off;
-	register short *ino = (short *) pag;
-
-	if ((n = GET_SHORT(ino,0)) < 0 || n > PBLKSIZ / (int)sizeof(short))
-		return 0;
-
-	if (n > 0) {
-		off = PBLKSIZ;
-		for (ino++; n > 0; ino += 2) {
-			if (GET_SHORT(ino,0) > off || GET_SHORT(ino,1) > off ||
-			    GET_SHORT(ino,1) > GET_SHORT(ino,0))
-				return 0;
-			off = GET_SHORT(ino,1);
-			n -= 2;
-		}
-	}
-	return 1;
-}
-
-/* hash.c */
-/*
- * sdbm - ndbm work-alike hashed database library
- * based on Per-Aake Larson's Dynamic Hashing algorithms. BIT 18 (1978).
- * author: oz@nexus.yorku.ca
- * status: public domain. keep it that way.
- *
- * hashing routine
- */
-
-/*
- * polynomial conversion ignoring overflows
- * [this seems to work remarkably well, in fact better
- * then the ndbm hash function. Replace at your own risk]
- * use: 65599	nice.
- *      65587   even better.
- */
-long
-sdbm_hash(register char *str, register int len)
-{
-	register unsigned long n = 0;
-
-#ifdef DUFF
-
-#define HASHC	n = *str++ + 65599 * n
-
-	if (len > 0) {
-		register int loop = (len + 8 - 1) >> 3;
-
-		switch(len & (8 - 1)) {
-		case 0:	do {
-			HASHC;	case 7:	HASHC;
-		case 6:	HASHC;	case 5:	HASHC;
-		case 4:	HASHC;	case 3:	HASHC;
-		case 2:	HASHC;	case 1:	HASHC;
-			} while (--loop);
-		}
-
-	}
-#else
-	while (len--)
-		n = ((*str++) & 255) + 65587L * n;
-#endif
-	return n;
-}
diff --git a/ext/sdbm/depend b/ext/sdbm/depend
deleted file mode 100644
index 089c3f8e60..0000000000
--- a/ext/sdbm/depend
+++ /dev/null
@@ -1,331 +0,0 @@
-# AUTOGENERATED DEPENDENCIES START
-_sdbm.o: $(RUBY_EXTCONF_H)
-_sdbm.o: $(arch_hdrdir)/ruby/config.h
-_sdbm.o: $(hdrdir)/ruby/internal/anyargs.h
-_sdbm.o: $(hdrdir)/ruby/internal/arithmetic.h
-_sdbm.o: $(hdrdir)/ruby/internal/arithmetic/char.h
-_sdbm.o: $(hdrdir)/ruby/internal/arithmetic/double.h
-_sdbm.o: $(hdrdir)/ruby/internal/arithmetic/fixnum.h
-_sdbm.o: $(hdrdir)/ruby/internal/arithmetic/gid_t.h
-_sdbm.o: $(hdrdir)/ruby/internal/arithmetic/int.h
-_sdbm.o: $(hdrdir)/ruby/internal/arithmetic/intptr_t.h
-_sdbm.o: $(hdrdir)/ruby/internal/arithmetic/long.h
-_sdbm.o: $(hdrdir)/ruby/internal/arithmetic/long_long.h
-_sdbm.o: $(hdrdir)/ruby/internal/arithmetic/mode_t.h
-_sdbm.o: $(hdrdir)/ruby/internal/arithmetic/off_t.h
-_sdbm.o: $(hdrdir)/ruby/internal/arithmetic/pid_t.h
-_sdbm.o: $(hdrdir)/ruby/internal/arithmetic/short.h
-_sdbm.o: $(hdrdir)/ruby/internal/arithmetic/size_t.h
-_sdbm.o: $(hdrdir)/ruby/internal/arithmetic/st_data_t.h
-_sdbm.o: $(hdrdir)/ruby/internal/arithmetic/uid_t.h
-_sdbm.o: $(hdrdir)/ruby/internal/assume.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/alloc_size.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/artificial.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/cold.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/const.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/constexpr.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/deprecated.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/diagnose_if.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/enum_extensibility.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/error.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/flag_enum.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/forceinline.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/format.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/maybe_unused.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/noalias.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/nodiscard.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/noexcept.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/noinline.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/nonnull.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/noreturn.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/pure.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/restrict.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/returns_nonnull.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/warning.h
-_sdbm.o: $(hdrdir)/ruby/internal/attr/weakref.h
-_sdbm.o: $(hdrdir)/ruby/internal/cast.h
-_sdbm.o: $(hdrdir)/ruby/internal/compiler_is.h
-_sdbm.o: $(hdrdir)/ruby/internal/compiler_is/apple.h
-_sdbm.o: $(hdrdir)/ruby/internal/compiler_is/clang.h
-_sdbm.o: $(hdrdir)/ruby/internal/compiler_is/gcc.h
-_sdbm.o: $(hdrdir)/ruby/internal/compiler_is/intel.h
-_sdbm.o: $(hdrdir)/ruby/internal/compiler_is/msvc.h
-_sdbm.o: $(hdrdir)/ruby/internal/compiler_is/sunpro.h
-_sdbm.o: $(hdrdir)/ruby/internal/compiler_since.h
-_sdbm.o: $(hdrdir)/ruby/internal/config.h
-_sdbm.o: $(hdrdir)/ruby/internal/constant_p.h
-_sdbm.o: $(hdrdir)/ruby/internal/core.h
-_sdbm.o: $(hdrdir)/ruby/internal/core/rarray.h
-_sdbm.o: $(hdrdir)/ruby/internal/core/rbasic.h
-_sdbm.o: $(hdrdir)/ruby/internal/core/rbignum.h
-_sdbm.o: $(hdrdir)/ruby/internal/core/rclass.h
-_sdbm.o: $(hdrdir)/ruby/internal/core/rdata.h
-_sdbm.o: $(hdrdir)/ruby/internal/core/rfile.h
-_sdbm.o: $(hdrdir)/ruby/internal/core/rhash.h
-_sdbm.o: $(hdrdir)/ruby/internal/core/robject.h
-_sdbm.o: $(hdrdir)/ruby/internal/core/rregexp.h
-_sdbm.o: $(hdrdir)/ruby/internal/core/rstring.h
-_sdbm.o: $(hdrdir)/ruby/internal/core/rstruct.h
-_sdbm.o: $(hdrdir)/ruby/internal/core/rtypeddata.h
-_sdbm.o: $(hdrdir)/ruby/internal/ctype.h
-_sdbm.o: $(hdrdir)/ruby/internal/dllexport.h
-_sdbm.o: $(hdrdir)/ruby/internal/dosish.h
-_sdbm.o: $(hdrdir)/ruby/internal/error.h
-_sdbm.o: $(hdrdir)/ruby/internal/eval.h
-_sdbm.o: $(hdrdir)/ruby/internal/event.h
-_sdbm.o: $(hdrdir)/ruby/internal/fl_type.h
-_sdbm.o: $(hdrdir)/ruby/internal/gc.h
-_sdbm.o: $(hdrdir)/ruby/internal/glob.h
-_sdbm.o: $(hdrdir)/ruby/internal/globals.h
-_sdbm.o: $(hdrdir)/ruby/internal/has/attribute.h
-_sdbm.o: $(hdrdir)/ruby/internal/has/builtin.h
-_sdbm.o: $(hdrdir)/ruby/internal/has/c_attribute.h
-_sdbm.o: $(hdrdir)/ruby/internal/has/cpp_attribute.h
-_sdbm.o: $(hdrdir)/ruby/internal/has/declspec_attribute.h
-_sdbm.o: $(hdrdir)/ruby/internal/has/extension.h
-_sdbm.o: $(hdrdir)/ruby/internal/has/feature.h
-_sdbm.o: $(hdrdir)/ruby/internal/has/warning.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/array.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/bignum.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/class.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/compar.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/complex.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/cont.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/dir.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/enum.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/enumerator.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/error.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/eval.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/file.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/gc.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/hash.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/io.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/load.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/marshal.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/numeric.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/object.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/parse.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/proc.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/process.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/random.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/range.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/rational.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/re.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/ruby.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/select.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/select/largesize.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/signal.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/sprintf.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/string.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/struct.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/thread.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/time.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/variable.h
-_sdbm.o: $(hdrdir)/ruby/internal/intern/vm.h
-_sdbm.o: $(hdrdir)/ruby/internal/interpreter.h
-_sdbm.o: $(hdrdir)/ruby/internal/iterator.h
-_sdbm.o: $(hdrdir)/ruby/internal/memory.h
-_sdbm.o: $(hdrdir)/ruby/internal/method.h
-_sdbm.o: $(hdrdir)/ruby/internal/module.h
-_sdbm.o: $(hdrdir)/ruby/internal/newobj.h
-_sdbm.o: $(hdrdir)/ruby/internal/rgengc.h
-_sdbm.o: $(hdrdir)/ruby/internal/scan_args.h
-_sdbm.o: $(hdrdir)/ruby/internal/special_consts.h
-_sdbm.o: $(hdrdir)/ruby/internal/static_assert.h
-_sdbm.o: $(hdrdir)/ruby/internal/stdalign.h
-_sdbm.o: $(hdrdir)/ruby/internal/stdbool.h
-_sdbm.o: $(hdrdir)/ruby/internal/symbol.h
-_sdbm.o: $(hdrdir)/ruby/internal/token_paste.h
-_sdbm.o: $(hdrdir)/ruby/internal/value.h
-_sdbm.o: $(hdrdir)/ruby/internal/value_type.h
-_sdbm.o: $(hdrdir)/ruby/internal/variable.h
-_sdbm.o: $(hdrdir)/ruby/internal/warning_push.h
-_sdbm.o: $(hdrdir)/ruby/internal/xmalloc.h
-_sdbm.o: $(hdrdir)/ruby/assert.h
-_sdbm.o: $(hdrdir)/ruby/backward.h
-_sdbm.o: $(hdrdir)/ruby/backward/2/assume.h
-_sdbm.o: $(hdrdir)/ruby/backward/2/attributes.h
-_sdbm.o: $(hdrdir)/ruby/backward/2/bool.h
-_sdbm.o: $(hdrdir)/ruby/backward/2/extern.h
-_sdbm.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
-_sdbm.o: $(hdrdir)/ruby/backward/2/inttypes.h
-_sdbm.o: $(hdrdir)/ruby/backward/2/limits.h
-_sdbm.o: $(hdrdir)/ruby/backward/2/long_long.h
-_sdbm.o: $(hdrdir)/ruby/backward/2/r_cast.h
-_sdbm.o: $(hdrdir)/ruby/backward/2/rmodule.h
-_sdbm.o: $(hdrdir)/ruby/backward/2/stdalign.h
-_sdbm.o: $(hdrdir)/ruby/backward/2/stdarg.h
-_sdbm.o: $(hdrdir)/ruby/defines.h
-_sdbm.o: $(hdrdir)/ruby/intern.h
-_sdbm.o: $(hdrdir)/ruby/missing.h
-_sdbm.o: $(hdrdir)/ruby/ruby.h
-_sdbm.o: $(hdrdir)/ruby/st.h
-_sdbm.o: $(hdrdir)/ruby/subst.h
-_sdbm.o: _sdbm.c
-_sdbm.o: sdbm.h
-init.o: $(RUBY_EXTCONF_H)
-init.o: $(arch_hdrdir)/ruby/config.h
-init.o: $(hdrdir)/ruby.h
-init.o: $(hdrdir)/ruby/internal/anyargs.h
-init.o: $(hdrdir)/ruby/internal/arithmetic.h
-init.o: $(hdrdir)/ruby/internal/arithmetic/char.h
-init.o: $(hdrdir)/ruby/internal/arithmetic/double.h
-init.o: $(hdrdir)/ruby/internal/arithmetic/fixnum.h
-init.o: $(hdrdir)/ruby/internal/arithmetic/gid_t.h
-init.o: $(hdrdir)/ruby/internal/arithmetic/int.h
-init.o: $(hdrdir)/ruby/internal/arithmetic/intptr_t.h
-init.o: $(hdrdir)/ruby/internal/arithmetic/long.h
-init.o: $(hdrdir)/ruby/internal/arithmetic/long_long.h
-init.o: $(hdrdir)/ruby/internal/arithmetic/mode_t.h
-init.o: $(hdrdir)/ruby/internal/arithmetic/off_t.h
-init.o: $(hdrdir)/ruby/internal/arithmetic/pid_t.h
-init.o: $(hdrdir)/ruby/internal/arithmetic/short.h
-init.o: $(hdrdir)/ruby/internal/arithmetic/size_t.h
-init.o: $(hdrdir)/ruby/internal/arithmetic/st_data_t.h
-init.o: $(hdrdir)/ruby/internal/arithmetic/uid_t.h
-init.o: $(hdrdir)/ruby/internal/assume.h
-init.o: $(hdrdir)/ruby/internal/attr/alloc_size.h
-init.o: $(hdrdir)/ruby/internal/attr/artificial.h
-init.o: $(hdrdir)/ruby/internal/attr/cold.h
-init.o: $(hdrdir)/ruby/internal/attr/const.h
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-init.o: $(hdrdir)/ruby/internal/attr/deprecated.h
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-init.o: $(hdrdir)/ruby/internal/attr/error.h
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-init.o: $(hdrdir)/ruby/internal/attr/noalias.h
-init.o: $(hdrdir)/ruby/internal/attr/nodiscard.h
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-init.o: $(hdrdir)/ruby/internal/has/extension.h
-init.o: $(hdrdir)/ruby/internal/has/feature.h
-init.o: $(hdrdir)/ruby/internal/has/warning.h
-init.o: $(hdrdir)/ruby/internal/intern/array.h
-init.o: $(hdrdir)/ruby/internal/intern/bignum.h
-init.o: $(hdrdir)/ruby/internal/intern/class.h
-init.o: $(hdrdir)/ruby/internal/intern/compar.h
-init.o: $(hdrdir)/ruby/internal/intern/complex.h
-init.o: $(hdrdir)/ruby/internal/intern/cont.h
-init.o: $(hdrdir)/ruby/internal/intern/dir.h
-init.o: $(hdrdir)/ruby/internal/intern/enum.h
-init.o: $(hdrdir)/ruby/internal/intern/enumerator.h
-init.o: $(hdrdir)/ruby/internal/intern/error.h
-init.o: $(hdrdir)/ruby/internal/intern/eval.h
-init.o: $(hdrdir)/ruby/internal/intern/file.h
-init.o: $(hdrdir)/ruby/internal/intern/gc.h
-init.o: $(hdrdir)/ruby/internal/intern/hash.h
-init.o: $(hdrdir)/ruby/internal/intern/io.h
-init.o: $(hdrdir)/ruby/internal/intern/load.h
-init.o: $(hdrdir)/ruby/internal/intern/marshal.h
-init.o: $(hdrdir)/ruby/internal/intern/numeric.h
-init.o: $(hdrdir)/ruby/internal/intern/object.h
-init.o: $(hdrdir)/ruby/internal/intern/parse.h
-init.o: $(hdrdir)/ruby/internal/intern/proc.h
-init.o: $(hdrdir)/ruby/internal/intern/process.h
-init.o: $(hdrdir)/ruby/internal/intern/random.h
-init.o: $(hdrdir)/ruby/internal/intern/range.h
-init.o: $(hdrdir)/ruby/internal/intern/rational.h
-init.o: $(hdrdir)/ruby/internal/intern/re.h
-init.o: $(hdrdir)/ruby/internal/intern/ruby.h
-init.o: $(hdrdir)/ruby/internal/intern/select.h
-init.o: $(hdrdir)/ruby/internal/intern/select/largesize.h
-init.o: $(hdrdir)/ruby/internal/intern/signal.h
-init.o: $(hdrdir)/ruby/internal/intern/sprintf.h
-init.o: $(hdrdir)/ruby/internal/intern/string.h
-init.o: $(hdrdir)/ruby/internal/intern/struct.h
-init.o: $(hdrdir)/ruby/internal/intern/thread.h
-init.o: $(hdrdir)/ruby/internal/intern/time.h
-init.o: $(hdrdir)/ruby/internal/intern/variable.h
-init.o: $(hdrdir)/ruby/internal/intern/vm.h
-init.o: $(hdrdir)/ruby/internal/interpreter.h
-init.o: $(hdrdir)/ruby/internal/iterator.h
-init.o: $(hdrdir)/ruby/internal/memory.h
-init.o: $(hdrdir)/ruby/internal/method.h
-init.o: $(hdrdir)/ruby/internal/module.h
-init.o: $(hdrdir)/ruby/internal/newobj.h
-init.o: $(hdrdir)/ruby/internal/rgengc.h
-init.o: $(hdrdir)/ruby/internal/scan_args.h
-init.o: $(hdrdir)/ruby/internal/special_consts.h
-init.o: $(hdrdir)/ruby/internal/static_assert.h
-init.o: $(hdrdir)/ruby/internal/stdalign.h
-init.o: $(hdrdir)/ruby/internal/stdbool.h
-init.o: $(hdrdir)/ruby/internal/symbol.h
-init.o: $(hdrdir)/ruby/internal/token_paste.h
-init.o: $(hdrdir)/ruby/internal/value.h
-init.o: $(hdrdir)/ruby/internal/value_type.h
-init.o: $(hdrdir)/ruby/internal/variable.h
-init.o: $(hdrdir)/ruby/internal/warning_push.h
-init.o: $(hdrdir)/ruby/internal/xmalloc.h
-init.o: $(hdrdir)/ruby/assert.h
-init.o: $(hdrdir)/ruby/backward.h
-init.o: $(hdrdir)/ruby/backward/2/assume.h
-init.o: $(hdrdir)/ruby/backward/2/attributes.h
-init.o: $(hdrdir)/ruby/backward/2/bool.h
-init.o: $(hdrdir)/ruby/backward/2/extern.h
-init.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
-init.o: $(hdrdir)/ruby/backward/2/inttypes.h
-init.o: $(hdrdir)/ruby/backward/2/limits.h
-init.o: $(hdrdir)/ruby/backward/2/long_long.h
-init.o: $(hdrdir)/ruby/backward/2/r_cast.h
-init.o: $(hdrdir)/ruby/backward/2/rmodule.h
-init.o: $(hdrdir)/ruby/backward/2/stdalign.h
-init.o: $(hdrdir)/ruby/backward/2/stdarg.h
-init.o: $(hdrdir)/ruby/defines.h
-init.o: $(hdrdir)/ruby/intern.h
-init.o: $(hdrdir)/ruby/missing.h
-init.o: $(hdrdir)/ruby/ruby.h
-init.o: $(hdrdir)/ruby/st.h
-init.o: $(hdrdir)/ruby/subst.h
-init.o: init.c
-init.o: sdbm.h
-# AUTOGENERATED DEPENDENCIES END
diff --git a/ext/sdbm/extconf.rb b/ext/sdbm/extconf.rb
deleted file mode 100644
index bdf3e299e6..0000000000
--- a/ext/sdbm/extconf.rb
+++ /dev/null
@@ -1,5 +0,0 @@
-# frozen_string_literal: false
-require 'mkmf'
-
-$defs << "-D""BADMESS=0"
-create_makefile("sdbm")
diff --git a/ext/sdbm/init.c b/ext/sdbm/init.c
deleted file mode 100644
index 42292b99cd..0000000000
--- a/ext/sdbm/init.c
+++ /dev/null
@@ -1,1067 +0,0 @@
-/************************************************
-
-  sdbminit.c -
-
-  $Author$
-  created at: Fri May  7 08:34:24 JST 1999
-
-  Copyright (C) 1995-2001 Yukihiro Matsumoto
-
-************************************************/
-
-#include "ruby.h"
-
-#include "sdbm.h"
-#include <fcntl.h>
-#include <errno.h>
-
-/*
- * Document-class: SDBM
- *
- * SDBM provides a simple file-based key-value store, which can only store
- * String keys and values.
- *
- * Note that Ruby comes with the source code for SDBM, while the DBM and GDBM
- * standard libraries rely on external libraries and headers.
- *
- * === Examples
- *
- * Insert values:
- *
- *   require 'sdbm'
- *
- *   SDBM.open 'my_database' do |db|
- *     db['apple'] = 'fruit'
- *     db['pear'] = 'fruit'
- *     db['carrot'] = 'vegetable'
- *     db['tomato'] = 'vegetable'
- *   end
- *
- * Bulk update:
- *
- *   require 'sdbm'
- *
- *   SDBM.open 'my_database' do |db|
- *     db.update('peach' => 'fruit', 'tomato' => 'fruit')
- *   end
- *
- * Retrieve values:
- *
- *   require 'sdbm'
- *
- *   SDBM.open 'my_database' do |db|
- *     db.each do |key, value|
- *       puts "Key: #{key}, Value: #{value}"
- *     end
- *   end
- *
- * Outputs:
- *
- *   Key: apple, Value: fruit
- *   Key: pear, Value: fruit
- *   Key: carrot, Value: vegetable
- *   Key: peach, Value: fruit
- *   Key: tomato, Value: fruit
- */
-
-static VALUE rb_cDBM, rb_eDBMError;
-
-struct dbmdata {
-    int  di_size;
-    DBM *di_dbm;
-};
-
-NORETURN(static void closed_sdbm(void));
-
-static void
-closed_sdbm(void)
-{
-    rb_raise(rb_eDBMError, "closed SDBM file");
-}
-
-#define GetDBM(obj, dbmp) do {\
-    TypedData_Get_Struct((obj), struct dbmdata, &sdbm_type, (dbmp));\
-    if ((dbmp)->di_dbm == 0) closed_sdbm();\
-} while (0)
-
-#define GetDBM2(obj, dbmp, dbm) do {\
-    GetDBM((obj), (dbmp));\
-    (dbm) = (dbmp)->di_dbm;\
-} while (0)
-
-static void
-free_sdbm(void *ptr)
-{
-    struct dbmdata *dbmp = ptr;
-
-    if (dbmp->di_dbm) sdbm_close(dbmp->di_dbm);
-    ruby_xfree(dbmp);
-}
-
-static size_t
-memsize_dbm(const void *ptr)
-{
-    const struct dbmdata *dbmp = ptr;
-    size_t size = sizeof(*dbmp);
-    if (dbmp->di_dbm)
-	size += sizeof(DBM);
-    return size;
-}
-
-static const rb_data_type_t sdbm_type = {
-    "sdbm",
-    {0, free_sdbm, memsize_dbm,},
-    0, 0,
-    RUBY_TYPED_FREE_IMMEDIATELY,
-};
-
-/*
- * call-seq:
- *   sdbm.close -> nil
- *
- * Closes the database file.
- *
- * Raises SDBMError if the database is already closed.
- */
-static VALUE
-fsdbm_close(VALUE obj)
-{
-    struct dbmdata *dbmp;
-
-    GetDBM(obj, dbmp);
-    sdbm_close(dbmp->di_dbm);
-    dbmp->di_dbm = 0;
-
-    return Qnil;
-}
-
-/*
- * call-seq:
- *   sdbm.closed? -> true or false
- *
- * Returns +true+ if the database is closed.
- */
-static VALUE
-fsdbm_closed(VALUE obj)
-{
-    struct dbmdata *dbmp;
-
-    TypedData_Get_Struct(obj, struct dbmdata, &sdbm_type, dbmp);
-    if (dbmp->di_dbm == 0)
-	return Qtrue;
-
-    return Qfalse;
-}
-
-static VALUE
-fsdbm_alloc(VALUE klass)
-{
-    struct dbmdata *dbmp;
-
-    return TypedData_Make_Struct(klass, struct dbmdata, &sdbm_type, dbmp);
-}
-/*
- * call-seq:
- *   SDBM.new(filename, mode = 0666)
- *
- * Creates a new database handle by opening the given +filename+. SDBM actually
- * uses two physical files, with extensions '.dir' and '.pag'. These extensions
- * will automatically be appended to the +filename+.
- *
- * If the file does not exist, a new file will be created using the given
- * +mode+, unless +mode+ is explicitly set to nil. In the latter case, no
- * database will be created.
- *
- * If the file exists, it will be opened in read/write mode. If this fails, it
- * will be opened in read-only mode.
- */
-static VALUE
-fsdbm_initialize(int argc, VALUE *argv, VALUE obj)
-{
-    VALUE file, vmode;
-    DBM *dbm;
-    struct dbmdata *dbmp;
-    int mode;
-
-    TypedData_Get_Struct(obj, struct dbmdata, &sdbm_type, dbmp);
-    if (rb_scan_args(argc, argv, "11", &file, &vmode) == 1) {
-	mode = 0666;		/* default value */
-    }
-    else if (NIL_P(vmode)) {
-	mode = -1;		/* return nil if DB not exist */
-    }
-    else {
-	mode = NUM2INT(vmode);
-    }
-    FilePathValue(file);
-
-    dbm = 0;
-    if (mode >= 0)
-	dbm = sdbm_open(RSTRING_PTR(file), O_RDWR|O_CREAT, mode);
-    if (!dbm)
-	dbm = sdbm_open(RSTRING_PTR(file), O_RDWR, 0);
-    if (!dbm)
-	dbm = sdbm_open(RSTRING_PTR(file), O_RDONLY, 0);
-
-    if (!dbm) {
-	if (mode == -1) return Qnil;
-	rb_sys_fail_str(file);
-    }
-
-    if (dbmp->di_dbm)
-	sdbm_close(dbmp->di_dbm);
-    dbmp->di_dbm = dbm;
-    dbmp->di_size = -1;
-
-    return obj;
-}
-
-/*
- * call-seq:
- *   SDBM.open(filename, mode = 0666)
- *   SDBM.open(filename, mode = 0666) { |sdbm| ... }
- *
- * If called without a block, this is the same as SDBM.new.
- *
- * If a block is given, the new database will be passed to the block and
- * will be safely closed after the block has executed.
- *
- * Example:
- *
- *     require 'sdbm'
- *
- *     SDBM.open('my_database') do |db|
- *       db['hello'] = 'world'
- *     end
- */
-static VALUE
-fsdbm_s_open(int argc, VALUE *argv, VALUE klass)
-{
-    VALUE obj = fsdbm_alloc(klass);
-
-    if (NIL_P(fsdbm_initialize(argc, argv, obj))) {
-	return Qnil;
-    }
-
-    if (rb_block_given_p()) {
-        return rb_ensure(rb_yield, obj, fsdbm_close, obj);
-    }
-
-    return obj;
-}
-
-static VALUE
-fsdbm_fetch(VALUE obj, VALUE keystr, VALUE ifnone)
-{
-    datum key, value;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-
-    ExportStringValue(keystr);
-    key.dptr = RSTRING_PTR(keystr);
-    key.dsize = RSTRING_LENINT(keystr);
-
-    GetDBM2(obj, dbmp, dbm);
-    value = sdbm_fetch(dbm, key);
-    if (value.dptr == 0) {
-	if (ifnone == Qnil && rb_block_given_p())
-	    return rb_yield(rb_external_str_new(key.dptr, key.dsize));
-	return ifnone;
-    }
-    return rb_external_str_new(value.dptr, value.dsize);
-}
-
-/*
- * call-seq:
- *   sdbm[key] -> value or nil
- *
- * Returns the +value+ in the database associated with the given +key+ string.
- *
- * If no value is found, returns +nil+.
- */
-static VALUE
-fsdbm_aref(VALUE obj, VALUE keystr)
-{
-    return fsdbm_fetch(obj, keystr, Qnil);
-}
-
-/*
- * call-seq:
- *   sdbm.fetch(key) -> value or nil
- *   sdbm.fetch(key) { |key| ... }
- *
- * Returns the +value+ in the database associated with the given +key+ string.
- *
- * If a block is provided, the block will be called when there is no
- * +value+ associated with the given +key+. The +key+ will be passed in as an
- * argument to the block.
- *
- * If no block is provided and no value is associated with the given +key+,
- * then an IndexError will be raised.
- */
-static VALUE
-fsdbm_fetch_m(int argc, VALUE *argv, VALUE obj)
-{
-    VALUE keystr, valstr, ifnone;
-
-    rb_scan_args(argc, argv, "11", &keystr, &ifnone);
-    valstr = fsdbm_fetch(obj, keystr, ifnone);
-    if (argc == 1 && !rb_block_given_p() && NIL_P(valstr))
-	rb_raise(rb_eIndexError, "key not found");
-
-    return valstr;
-}
-
-/*
- * call-seq:
- *   sdbm.key(value) -> key
- *
- * Returns the +key+ associated with the given +value+. If more than one
- * +key+ corresponds to the given +value+, then the first key to be found
- * will be returned. If no keys are found, +nil+ will be returned.
- */
-static VALUE
-fsdbm_key(VALUE obj, VALUE valstr)
-{
-    datum key, val;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-
-    ExportStringValue(valstr);
-    val.dptr = RSTRING_PTR(valstr);
-    val.dsize = RSTRING_LENINT(valstr);
-
-    GetDBM2(obj, dbmp, dbm);
-    for (key = sdbm_firstkey(dbm); key.dptr; key = sdbm_nextkey(dbm)) {
-	val = sdbm_fetch(dbm, key);
-	if (val.dsize == RSTRING_LEN(valstr) &&
-	    memcmp(val.dptr, RSTRING_PTR(valstr), val.dsize) == 0)
-	    return rb_external_str_new(key.dptr, key.dsize);
-    }
-    return Qnil;
-}
-
-/*
- * :nodoc:
- */
-static VALUE
-fsdbm_index(VALUE hash, VALUE value)
-{
-    rb_warn("SDBM#index is deprecated; use SDBM#key");
-    return fsdbm_key(hash, value);
-}
-
-/* call-seq:
- *   sdbm.select { |key, value| ... } -> Array
- *
- * Returns a new Array of key-value pairs for which the block returns +true+.
- *
- * Example:
- *
- *    require 'sdbm'
- *
- *    SDBM.open 'my_database' do |db|
- *      db['apple'] = 'fruit'
- *      db['pear'] = 'fruit'
- *      db['spinach'] = 'vegetable'
- *
- *      veggies = db.select do |key, value|
- *        value == 'vegetable'
- *      end #=> [["apple", "fruit"], ["pear", "fruit"]]
- *    end
- */
-static VALUE
-fsdbm_select(VALUE obj)
-{
-    VALUE new = rb_ary_new();
-    datum key, val;
-    DBM *dbm;
-    struct dbmdata *dbmp;
-
-    GetDBM2(obj, dbmp, dbm);
-    for (key = sdbm_firstkey(dbm); key.dptr; key = sdbm_nextkey(dbm)) {
-	VALUE assoc, v;
-	val = sdbm_fetch(dbm, key);
-	assoc = rb_assoc_new(rb_external_str_new(key.dptr, key.dsize),
-			     rb_external_str_new(val.dptr, val.dsize));
-	v = rb_yield(assoc);
-	if (RTEST(v)) {
-	    rb_ary_push(new, assoc);
-	}
-	GetDBM2(obj, dbmp, dbm);
-    }
-
-    return new;
-}
-
-/* call-seq:
- *   sdbm.values_at(key, ...) -> Array
- *
- * Returns an Array of values corresponding to the given keys.
- */
-static VALUE
-fsdbm_values_at(int argc, VALUE *argv, VALUE obj)
-{
-    VALUE new = rb_ary_new2(argc);
-    int i;
-
-    for (i=0; i<argc; i++) {
-        rb_ary_push(new, fsdbm_fetch(obj, argv[i], Qnil));
-    }
-
-    return new;
-}
-
-static void
-fdbm_modify(VALUE obj)
-{
-    if (OBJ_FROZEN(obj)) rb_error_frozen("SDBM");
-}
-
-/*
- * call-seq:
- *   sdbm.delete(key) -> value or nil
- *   sdbm.delete(key) { |key, value| ... }
- *
- * Deletes the key-value pair corresponding to the given +key+. If the
- * +key+ exists, the deleted value will be returned, otherwise +nil+.
- *
- * If a block is provided, the deleted +key+ and +value+ will be passed to
- * the block as arguments. If the +key+ does not exist in the database, the
- * value will be +nil+.
- */
-static VALUE
-fsdbm_delete(VALUE obj, VALUE keystr)
-{
-    datum key, value;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-    VALUE valstr;
-
-    fdbm_modify(obj);
-    ExportStringValue(keystr);
-    key.dptr = RSTRING_PTR(keystr);
-    key.dsize = RSTRING_LENINT(keystr);
-
-    GetDBM2(obj, dbmp, dbm);
-    dbmp->di_size = -1;
-
-    value = sdbm_fetch(dbm, key);
-    if (value.dptr == 0) {
-	if (rb_block_given_p()) return rb_yield(keystr);
-	return Qnil;
-    }
-
-    /* need to save value before sdbm_delete() */
-    valstr = rb_external_str_new(value.dptr, value.dsize);
-
-    if (sdbm_delete(dbm, key)) {
-	dbmp->di_size = -1;
-	rb_raise(rb_eDBMError, "dbm_delete failed");
-    }
-    else if (dbmp->di_size >= 0) {
-	dbmp->di_size--;
-    }
-    return valstr;
-}
-
-/*
- * call-seq:
- *   sdbm.shift -> Array or nil
- *
- * Removes a key-value pair from the database and returns them as an
- * Array. If the database is empty, returns +nil+.
- */
-static VALUE
-fsdbm_shift(VALUE obj)
-{
-    datum key, val;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-    VALUE keystr, valstr;
-
-    fdbm_modify(obj);
-    GetDBM2(obj, dbmp, dbm);
-    key = sdbm_firstkey(dbm);
-    if (!key.dptr) return Qnil;
-    val = sdbm_fetch(dbm, key);
-    keystr = rb_external_str_new(key.dptr, key.dsize);
-    valstr = rb_external_str_new(val.dptr, val.dsize);
-    sdbm_delete(dbm, key);
-    if (dbmp->di_size >= 0) {
-	dbmp->di_size--;
-    }
-
-    return rb_assoc_new(keystr, valstr);
-}
-
-/*
- * call-seq:
- *   sdbm.delete_if { |key, value| ... } -> self
- *   sdbm.reject!   { |key, value| ... } -> self
- *
- * Iterates over the key-value pairs in the database, deleting those for
- * which the block returns +true+.
- */
-static VALUE
-fsdbm_delete_if(VALUE obj)
-{
-    datum key, val;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-    VALUE keystr, valstr;
-    VALUE ret, ary = rb_ary_new();
-    long i;
-    int status = 0, n;
-
-    fdbm_modify(obj);
-    GetDBM2(obj, dbmp, dbm);
-    n = dbmp->di_size;
-    dbmp->di_size = -1;
-    for (key = sdbm_firstkey(dbm); key.dptr; key = sdbm_nextkey(dbm)) {
-	val = sdbm_fetch(dbm, key);
-	keystr = rb_external_str_new(key.dptr, key.dsize);
-	valstr = rb_external_str_new(val.dptr, val.dsize);
-        ret = rb_protect(rb_yield, rb_assoc_new(rb_str_dup(keystr), valstr), &status);
-        if (status != 0) break;
-	if (RTEST(ret)) rb_ary_push(ary, keystr);
-	GetDBM2(obj, dbmp, dbm);
-    }
-
-    for (i = 0; i < RARRAY_LEN(ary); i++) {
-	keystr = RARRAY_AREF(ary, i);
-	ExportStringValue(keystr);
-	key.dptr = RSTRING_PTR(keystr);
-	key.dsize = RSTRING_LENINT(keystr);
-	if (sdbm_delete(dbm, key)) {
-	    rb_raise(rb_eDBMError, "sdbm_delete failed");
-	}
-    }
-    if (status) rb_jump_tag(status);
-    if (n > 0) dbmp->di_size = n - RARRAY_LENINT(ary);
-
-    return obj;
-}
-
-/*
- * call-seq:
- *   sdbm.clear -> self
- *
- * Deletes all data from the database.
- */
-static VALUE
-fsdbm_clear(VALUE obj)
-{
-    datum key;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-
-    fdbm_modify(obj);
-    GetDBM2(obj, dbmp, dbm);
-    dbmp->di_size = -1;
-    while (key = sdbm_firstkey(dbm), key.dptr) {
-	if (sdbm_delete(dbm, key)) {
-	    rb_raise(rb_eDBMError, "sdbm_delete failed");
-	}
-    }
-    dbmp->di_size = 0;
-
-    return obj;
-}
-
-/*
- * call-seq:
- *   sdbm.invert -> Hash
- *
- * Returns a Hash in which the key-value pairs have been inverted.
- *
- * Example:
- *
- *   require 'sdbm'
- *
- *   SDBM.open 'my_database' do |db|
- *     db.update('apple' => 'fruit', 'spinach' => 'vegetable')
- *
- *     db.invert  #=> {"fruit" => "apple", "vegetable" => "spinach"}
- *   end
- */
-static VALUE
-fsdbm_invert(VALUE obj)
-{
-    datum key, val;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-    VALUE keystr, valstr;
-    VALUE hash = rb_hash_new();
-
-    GetDBM2(obj, dbmp, dbm);
-    for (key = sdbm_firstkey(dbm); key.dptr; key = sdbm_nextkey(dbm)) {
-	val = sdbm_fetch(dbm, key);
-	keystr = rb_external_str_new(key.dptr, key.dsize);
-	valstr = rb_external_str_new(val.dptr, val.dsize);
-	rb_hash_aset(hash, valstr, keystr);
-    }
-    return hash;
-}
-
-/*
- * call-seq:
- *   sdbm[key] = value      -> value
- *   sdbm.store(key, value) -> value
- *
- * Stores a new +value+ in the database with the given +key+ as an index.
- *
- * If the +key+ already exists, this will update the +value+ associated with
- * the +key+.
- *
- * Returns the given +value+.
- */
-static VALUE
-fsdbm_store(VALUE obj, VALUE keystr, VALUE valstr)
-{
-    datum key, val;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-
-    if (valstr == Qnil) {
-	fsdbm_delete(obj, keystr);
-	return Qnil;
-    }
-
-    fdbm_modify(obj);
-    ExportStringValue(keystr);
-    ExportStringValue(valstr);
-
-    key.dptr = RSTRING_PTR(keystr);
-    key.dsize = RSTRING_LENINT(keystr);
-
-    val.dptr = RSTRING_PTR(valstr);
-    val.dsize = RSTRING_LENINT(valstr);
-
-    GetDBM2(obj, dbmp, dbm);
-    dbmp->di_size = -1;
-    if (sdbm_store(dbm, key, val, DBM_REPLACE)) {
-#ifdef HAVE_DBM_CLAERERR
-	sdbm_clearerr(dbm);
-#endif
-	if (errno == EPERM) rb_sys_fail(0);
-	rb_raise(rb_eDBMError, "sdbm_store failed");
-    }
-
-    return valstr;
-}
-
-static VALUE
-update_i(RB_BLOCK_CALL_FUNC_ARGLIST(pair, dbm))
-{
-    const VALUE *ptr;
-    Check_Type(pair, T_ARRAY);
-    if (RARRAY_LEN(pair) < 2) {
-	rb_raise(rb_eArgError, "pair must be [key, value]");
-    }
-    ptr = RARRAY_CONST_PTR(pair);
-    fsdbm_store(dbm, ptr[0], ptr[1]);
-    return Qnil;
-}
-
-/*
- * call-seq:
- *   sdbm.update(pairs) -> self
- *
- * Insert or update key-value pairs.
- *
- * This method will work with any object which implements an each_pair
- * method, such as a Hash.
- */
-static VALUE
-fsdbm_update(VALUE obj, VALUE other)
-{
-    rb_block_call(other, rb_intern("each_pair"), 0, 0, update_i, obj);
-    return obj;
-}
-
-/*
- * call-seq:
- *   sdbm.replace(pairs) -> self
- *
- * Empties the database, then inserts the given key-value pairs.
- *
- * This method will work with any object which implements an each_pair
- * method, such as a Hash.
- */
-static VALUE
-fsdbm_replace(VALUE obj, VALUE other)
-{
-    fsdbm_clear(obj);
-    rb_block_call(other, rb_intern("each_pair"), 0, 0, update_i, obj);
-    return obj;
-}
-
-/*
- * call-seq:
- *   sdbm.length -> integer
- *   sdbm.size -> integer
- *
- * Returns the number of keys in the database.
- */
-static VALUE
-fsdbm_length(VALUE obj)
-{
-    datum key;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-    int i = 0;
-
-    GetDBM2(obj, dbmp, dbm);
-    if (dbmp->di_size > 0) return INT2FIX(dbmp->di_size);
-
-    for (key = sdbm_firstkey(dbm); key.dptr; key = sdbm_nextkey(dbm)) {
-	i++;
-    }
-    dbmp->di_size = i;
-
-    return INT2FIX(i);
-}
-
-/*
- * call-seq:
- *   sdbm.empty? -> true or false
- *
- * Returns +true+ if the database is empty.
- */
-static VALUE
-fsdbm_empty_p(VALUE obj)
-{
-    datum key;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-
-    GetDBM(obj, dbmp);
-    if (dbmp->di_size < 0) {
-	dbm = dbmp->di_dbm;
-
-	for (key = sdbm_firstkey(dbm); key.dptr; key = sdbm_nextkey(dbm)) {
-	    return Qfalse;
-	}
-    }
-    else {
-	if (dbmp->di_size)
-	    return Qfalse;
-    }
-    return Qtrue;
-}
-
-/*
- * call-seq:
- *   sdbm.each_value
- *   sdbm.each_value { |value| ... }
- *
- * Iterates over each +value+ in the database.
- *
- * If no block is given, returns an Enumerator.
- */
-static VALUE
-fsdbm_each_value(VALUE obj)
-{
-    datum key, val;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-
-    RETURN_ENUMERATOR(obj, 0, 0);
-
-    GetDBM2(obj, dbmp, dbm);
-    for (key = sdbm_firstkey(dbm); key.dptr; key = sdbm_nextkey(dbm)) {
-	val = sdbm_fetch(dbm, key);
-	rb_yield(rb_external_str_new(val.dptr, val.dsize));
-	GetDBM2(obj, dbmp, dbm);
-    }
-    return obj;
-}
-
-/*
- * call-seq:
- *   sdbm.each_key
- *   sdbm.each_key { |key| ... }
- *
- * Iterates over each +key+ in the database.
- *
- * If no block is given, returns an Enumerator.
- */
-static VALUE
-fsdbm_each_key(VALUE obj)
-{
-    datum key;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-
-    RETURN_ENUMERATOR(obj, 0, 0);
-
-    GetDBM2(obj, dbmp, dbm);
-    for (key = sdbm_firstkey(dbm); key.dptr; key = sdbm_nextkey(dbm)) {
-	rb_yield(rb_external_str_new(key.dptr, key.dsize));
-	GetDBM2(obj, dbmp, dbm);
-    }
-    return obj;
-}
-
-/*
- * call-seq:
- *   sdbm.each
- *   sdbm.each { |key, value| ... }
- *   sdbm.each_pair
- *   sdbm.each_pair { |key, value| ... }
- *
- * Iterates over each key-value pair in the database.
- *
- * If no block is given, returns an Enumerator.
- */
-static VALUE
-fsdbm_each_pair(VALUE obj)
-{
-    datum key, val;
-    DBM *dbm;
-    struct dbmdata *dbmp;
-    VALUE keystr, valstr;
-
-    RETURN_ENUMERATOR(obj, 0, 0);
-
-    GetDBM2(obj, dbmp, dbm);
-    for (key = sdbm_firstkey(dbm); key.dptr; key = sdbm_nextkey(dbm)) {
-	val = sdbm_fetch(dbm, key);
-	keystr = rb_external_str_new(key.dptr, key.dsize);
-	valstr = rb_external_str_new(val.dptr, val.dsize);
-	rb_yield(rb_assoc_new(keystr, valstr));
-	GetDBM2(obj, dbmp, dbm);
-    }
-
-    return obj;
-}
-
-/*
- * call-seq:
- *   sdbm.keys -> Array
- *
- * Returns a new Array containing the keys in the database.
- */
-static VALUE
-fsdbm_keys(VALUE obj)
-{
-    datum key;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-    VALUE ary;
-
-    GetDBM2(obj, dbmp, dbm);
-    ary = rb_ary_new();
-    for (key = sdbm_firstkey(dbm); key.dptr; key = sdbm_nextkey(dbm)) {
-	rb_ary_push(ary, rb_external_str_new(key.dptr, key.dsize));
-    }
-
-    return ary;
-}
-
-/*
- * call-seq:
- *   sdbm.values -> Array
- *
- * Returns a new Array containing the values in the database.
- */
-static VALUE
-fsdbm_values(VALUE obj)
-{
-    datum key, val;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-    VALUE ary;
-
-    GetDBM2(obj, dbmp, dbm);
-    ary = rb_ary_new();
-    for (key = sdbm_firstkey(dbm); key.dptr; key = sdbm_nextkey(dbm)) {
-	val = sdbm_fetch(dbm, key);
-	rb_ary_push(ary, rb_external_str_new(val.dptr, val.dsize));
-    }
-
-    return ary;
-}
-
-/*
- * call-seq:
- *   sdbm.include?(key) -> true or false
- *   sdbm.key?(key) -> true or false
- *   sdbm.member?(key) -> true or false
- *   sdbm.has_key?(key) -> true or false
- *
- * Returns +true+ if the database contains the given +key+.
- */
-static VALUE
-fsdbm_has_key(VALUE obj, VALUE keystr)
-{
-    datum key, val;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-
-    ExportStringValue(keystr);
-    key.dptr = RSTRING_PTR(keystr);
-    key.dsize = RSTRING_LENINT(keystr);
-
-    GetDBM2(obj, dbmp, dbm);
-    val = sdbm_fetch(dbm, key);
-    if (val.dptr) return Qtrue;
-    return Qfalse;
-}
-
-/*
- * call-seq:
- *   sdbm.value?(key) -> true or false
- *   sdbm.has_value?(key) -> true or false
- *
- * Returns +true+ if the database contains the given +value+.
- */
-static VALUE
-fsdbm_has_value(VALUE obj, VALUE valstr)
-{
-    datum key, val;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-
-    ExportStringValue(valstr);
-    val.dptr = RSTRING_PTR(valstr);
-    val.dsize = RSTRING_LENINT(valstr);
-
-    GetDBM2(obj, dbmp, dbm);
-    for (key = sdbm_firstkey(dbm); key.dptr; key = sdbm_nextkey(dbm)) {
-	val = sdbm_fetch(dbm, key);
-	if (val.dsize == RSTRING_LENINT(valstr) &&
-	    memcmp(val.dptr, RSTRING_PTR(valstr), val.dsize) == 0)
-	    return Qtrue;
-    }
-    return Qfalse;
-}
-
-/*
- * call-seq:
- *   sdbm.to_a -> Array
- *
- * Returns a new Array containing each key-value pair in the database.
- *
- * Example:
- *
- *   require 'sdbm'
- *
- *   SDBM.open 'my_database' do |db|
- *     db.update('apple' => 'fruit', 'spinach' => 'vegetable')
- *
- *     db.to_a  #=> [["apple", "fruit"], ["spinach", "vegetable"]]
- *   end
- */
-static VALUE
-fsdbm_to_a(VALUE obj)
-{
-    datum key, val;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-    VALUE ary;
-
-    GetDBM2(obj, dbmp, dbm);
-    ary = rb_ary_new();
-    for (key = sdbm_firstkey(dbm); key.dptr; key = sdbm_nextkey(dbm)) {
-	val = sdbm_fetch(dbm, key);
-	rb_ary_push(ary, rb_assoc_new(rb_external_str_new(key.dptr, key.dsize),
-				      rb_external_str_new(val.dptr, val.dsize)));
-    }
-
-    return ary;
-}
-
-/*
- * call-seq:
- *   sdbm.to_hash -> Hash
- *
- * Returns a new Hash containing each key-value pair in the database.
- */
-static VALUE
-fsdbm_to_hash(VALUE obj)
-{
-    datum key, val;
-    struct dbmdata *dbmp;
-    DBM *dbm;
-    VALUE hash;
-
-    GetDBM2(obj, dbmp, dbm);
-    hash = rb_hash_new();
-    for (key = sdbm_firstkey(dbm); key.dptr; key = sdbm_nextkey(dbm)) {
-	val = sdbm_fetch(dbm, key);
-	rb_hash_aset(hash, rb_external_str_new(key.dptr, key.dsize),
-		           rb_external_str_new(val.dptr, val.dsize));
-    }
-
-    return hash;
-}
-
-/*
- * call-seq:
- *   sdbm.reject { |key, value| ... } -> Hash
- *
- * Creates a new Hash using the key-value pairs from the database, then
- * calls Hash#reject with the given block, which returns a Hash with
- * only the key-value pairs for which the block returns +false+.
- */
-static VALUE
-fsdbm_reject(VALUE obj)
-{
-    return rb_hash_delete_if(fsdbm_to_hash(obj));
-}
-
-void
-Init_sdbm(void)
-{
-    rb_cDBM = rb_define_class("SDBM", rb_cObject);
-    rb_eDBMError = rb_define_class("SDBMError", rb_eStandardError);
-    /* Document-class: SDBMError
-     * Exception class used to return errors from the sdbm library.
-     */
-    rb_include_module(rb_cDBM, rb_mEnumerable);
-
-    rb_define_alloc_func(rb_cDBM, fsdbm_alloc);
-    rb_define_singleton_method(rb_cDBM, "open", fsdbm_s_open, -1);
-
-    rb_define_method(rb_cDBM, "initialize", fsdbm_initialize, -1);
-    rb_define_method(rb_cDBM, "close", fsdbm_close, 0);
-    rb_define_method(rb_cDBM, "closed?", fsdbm_closed, 0);
-    rb_define_method(rb_cDBM, "[]", fsdbm_aref, 1);
-    rb_define_method(rb_cDBM, "fetch", fsdbm_fetch_m, -1);
-    rb_define_method(rb_cDBM, "[]=", fsdbm_store, 2);
-    rb_define_method(rb_cDBM, "store", fsdbm_store, 2);
-    rb_define_method(rb_cDBM, "index",  fsdbm_index, 1);
-    rb_define_method(rb_cDBM, "key",  fsdbm_key, 1);
-    rb_define_method(rb_cDBM, "select",  fsdbm_select, 0);
-    rb_define_method(rb_cDBM, "values_at",  fsdbm_values_at, -1);
-    rb_define_method(rb_cDBM, "length", fsdbm_length, 0);
-    rb_define_method(rb_cDBM, "size", fsdbm_length, 0);
-    rb_define_method(rb_cDBM, "empty?", fsdbm_empty_p, 0);
-    rb_define_method(rb_cDBM, "each", fsdbm_each_pair, 0);
-    rb_define_method(rb_cDBM, "each_value", fsdbm_each_value, 0);
-    rb_define_method(rb_cDBM, "each_key", fsdbm_each_key, 0);
-    rb_define_method(rb_cDBM, "each_pair", fsdbm_each_pair, 0);
-    rb_define_method(rb_cDBM, "keys", fsdbm_keys, 0);
-    rb_define_method(rb_cDBM, "values", fsdbm_values, 0);
-    rb_define_method(rb_cDBM, "shift", fsdbm_shift, 0);
-    rb_define_method(rb_cDBM, "delete", fsdbm_delete, 1);
-    rb_define_method(rb_cDBM, "delete_if", fsdbm_delete_if, 0);
-    rb_define_method(rb_cDBM, "reject!", fsdbm_delete_if, 0);
-    rb_define_method(rb_cDBM, "reject", fsdbm_reject, 0);
-    rb_define_method(rb_cDBM, "clear", fsdbm_clear, 0);
-    rb_define_method(rb_cDBM,"invert", fsdbm_invert, 0);
-    rb_define_method(rb_cDBM,"update", fsdbm_update, 1);
-    rb_define_method(rb_cDBM,"replace", fsdbm_replace, 1);
-
-    rb_define_method(rb_cDBM, "has_key?", fsdbm_has_key, 1);
-    rb_define_method(rb_cDBM, "include?", fsdbm_has_key, 1);
-    rb_define_method(rb_cDBM, "key?", fsdbm_has_key, 1);
-    rb_define_method(rb_cDBM, "member?", fsdbm_has_key, 1);
-    rb_define_method(rb_cDBM, "has_value?", fsdbm_has_value, 1);
-    rb_define_method(rb_cDBM, "value?", fsdbm_has_value, 1);
-
-    rb_define_method(rb_cDBM, "to_a", fsdbm_to_a, 0);
-    rb_define_method(rb_cDBM, "to_hash", fsdbm_to_hash, 0);
-}
diff --git a/ext/sdbm/sdbm.gemspec b/ext/sdbm/sdbm.gemspec
deleted file mode 100644
index 6cf000b453..0000000000
--- a/ext/sdbm/sdbm.gemspec
+++ /dev/null
@@ -1,21 +0,0 @@
-# frozen_string_literal: true
-
-Gem::Specification.new do |s|
-  s.name = "sdbm"
-  s.version = '1.0.0'
-  s.summary = "Provides a simple file-based key-value store with String keys and values."
-  s.description = "Provides a simple file-based key-value store with String keys and values."
-
-  s.require_path = %w{lib}
-  s.files = %w{ext/sdbm/_sdbm.c ext/sdbm/extconf.rb ext/sdbm/init.c ext/sdbm/sdbm.h}
-  s.extensions = ["ext/sdbm/extconf.rb"]
-  s.required_ruby_version = ">= 2.3.0"
-
-  s.authors = ["Yukihiro Matsumoto"]
-  s.email = ["matz@ruby-lang.org"]
-  s.homepage = "https://github.com/ruby/sdbm"
-  s.license = "BSD-2-Clause"
-
-  s.add_development_dependency "test-unit"
-  s.add_development_dependency "rake-compiler"
-end
diff --git a/ext/sdbm/sdbm.h b/ext/sdbm/sdbm.h
deleted file mode 100644
index c3b53c4a8f..0000000000
--- a/ext/sdbm/sdbm.h
+++ /dev/null
@@ -1,86 +0,0 @@
-/*
- * sdbm - ndbm work-alike hashed database library
- * based on Per-Ake Larson's Dynamic Hashing algorithms. BIT 18 (1978).
- * author: oz@nexus.yorku.ca
- * status: public domain.
- */
-#ifndef	_SDBM_H_
-#define	_SDBM_H_
-
-#include <stdio.h>
-
-#define DBLKSIZ 4096
-#define PBLKSIZ 1024
-#define PAIRMAX 1008			/* arbitrary on PBLKSIZ-N */
-#define SPLTMAX	10			/* maximum allowed splits */
-					/* for a single insertion */
-#define DIRFEXT	".dir"
-#define PAGFEXT	".pag"
-
-typedef struct {
-	int dirf;		       /* directory file descriptor */
-	int pagf;		       /* page file descriptor */
-	int flags;		       /* status/error flags, see below */
-	int keyptr;		       /* current key for nextkey */
-	off_t maxbno;		       /* size of dirfile in bits */
-	long curbit;		       /* current bit number */
-	long hmask;		       /* current hash mask */
-	long blkptr;		       /* current block for nextkey */
-	long blkno;		       /* current page to read/write */
-	long pagbno;		       /* current page in pagbuf */
-	char pagbuf[PBLKSIZ];	       /* page file block buffer */
-	long dirbno;		       /* current block in dirbuf */
-	char dirbuf[DBLKSIZ];	       /* directory file block buffer */
-} DBM;
-
-#define DBM_RDONLY	0x1	       /* data base open read-only */
-#define DBM_IOERR	0x2	       /* data base I/O error */
-
-/*
- * utility macros
- */
-#define sdbm_rdonly(db)		((db)->flags & DBM_RDONLY)
-#define sdbm_error(db)		((db)->flags & DBM_IOERR)
-
-#define sdbm_clearerr(db)	((db)->flags &= ~DBM_IOERR)  /* ouch */
-
-#define sdbm_dirfno(db)	((db)->dirf)
-#define sdbm_pagfno(db)	((db)->pagf)
-
-typedef struct {
-	char *dptr;
-	int dsize;
-} datum;
-
-extern datum nullitem;
-
-#if defined(__STDC__)
-#define proto(p) p
-#else
-#define proto(p) ()
-#endif
-
-/*
- * flags to sdbm_store
- */
-#define DBM_INSERT	0
-#define DBM_REPLACE	1
-
-/*
- * ndbm interface
- */
-extern DBM *sdbm_open proto((char *, int, int));
-extern void sdbm_close proto((DBM *));
-extern datum sdbm_fetch proto((DBM *, datum));
-extern int sdbm_delete proto((DBM *, datum));
-extern int sdbm_store proto((DBM *, datum, datum, int));
-extern datum sdbm_firstkey proto((DBM *));
-extern datum sdbm_nextkey proto((DBM *));
-
-/*
- * other
- */
-extern DBM *sdbm_prep proto((char *, char *, int, int));
-extern long sdbm_hash proto((char *, int));
-
-#endif	/* _SDBM_H_ */
diff --git a/test/sdbm/test_sdbm.rb b/test/sdbm/test_sdbm.rb
deleted file mode 100644
index 6cea36d3a5..0000000000
--- a/test/sdbm/test_sdbm.rb
+++ /dev/null
@@ -1,544 +0,0 @@
-# frozen_string_literal: false
-require 'test/unit'
-require 'tmpdir'
-
-begin
-  require 'sdbm'
-rescue LoadError
-end
-
-class TestSDBM < Test::Unit::TestCase
-  def setup
-    @tmpdir = Dir.mktmpdir("tmptest_sdbm")
-    @prefix = "tmptest_sdbm_#{$$}"
-    @path = "#{@tmpdir}/#{@prefix}_"
-    assert_instance_of(SDBM, @sdbm = SDBM.new(@path))
-  end
-  def teardown
-    assert_nil(@sdbm.close)
-    ObjectSpace.each_object(SDBM) do |obj|
-      obj.close unless obj.closed?
-    end
-    FileUtils.remove_entry_secure @tmpdir
-  end
-
-  def check_size(expect, sdbm=@sdbm)
-    assert_equal(expect, sdbm.size)
-    n = 0
-    sdbm.each { n+=1 }
-    assert_equal(expect, n)
-    if expect == 0
-      assert_equal(true, sdbm.empty?)
-    else
-      assert_equal(false, sdbm.empty?)
-    end
-  end
-
-  def test_version
-    assert(! SDBM.const_defined?(:VERSION))
-  end
-
-  def test_s_new_has_no_block
-    # SDBM.new ignore the block
-    foo = true
-    assert_instance_of(SDBM, sdbm = SDBM.new("#{@tmpdir}/#{@prefix}") { foo = false })
-    assert_equal(foo, true)
-    assert_nil(sdbm.close)
-  end
-  def test_s_open_no_create
-    assert_nil(sdbm = SDBM.open("#{@tmpdir}/#{@prefix}", nil))
-  ensure
-    sdbm.close if sdbm
-  end
-  def test_s_open_with_block
-    assert_equal(SDBM.open("#{@tmpdir}/#{@prefix}") { :foo }, :foo)
-  end
-=begin
-  # Is it guaranteed on many OS?
-  def test_s_open_lock_one_process
-    # locking on one process
-    assert_instance_of(SDBM, sdbm  = SDBM.open("#{@tmpdir}/#{@prefix}", 0644))
-    assert_raise(Errno::EWOULDBLOCK) {
-      begin
-	SDBM.open("#{@tmpdir}/#{@prefix}", 0644)
-      rescue Errno::EAGAIN
-	raise Errno::EWOULDBLOCK
-      end
-    }
-  end
-=end
-
-  def open_db_child(dbname, *opts)
-    opts = [0644, *opts].map(&:inspect).join(', ')
-    args = [EnvUtil.rubybin, "-rsdbm", <<-SRC, dbname]
-    STDOUT.sync = true
-    gdbm = SDBM.open(ARGV.shift, #{opts})
-    puts sdbm.class
-    gets
-    SRC
-    IO.popen(args, "r+") do |f|
-      dbclass = f.gets
-      assert_equal("SDBM", dbclass.chomp)
-      yield
-    end
-  end
-
-  def test_s_open_nolock
-    dbname = "#{@tmpdir}/#{@prefix}"
-
-    open_db_child(dbname, SDBM::NOLOCK) do
-      assert_no_exception(Errno::EWOULDBLOCK, Errno::EAGAIN, Errno::EACCES) {
-        SDBM.open(dbname, 0644) {|sdbm|
-          assert_instance_of(SDBM, sdbm)
-        }
-      }
-    end
-
-    p Dir.glob("#{@tmpdir}/#{@prefix}*") if $DEBUG
-
-    open_db_child(dbname) do
-      assert_no_exception(Errno::EWOULDBLOCK, Errno::EAGAIN, Errno::EACCES) {
-	# this test is failed on Cygwin98 (???)
-        SDBM.open(dbname, 0644, SDBM::NOLOCK) {|sdbm|
-          assert_instance_of(SDBM, sdbm)
-        }
-      }
-    end
-  end if defined? SDBM::NOLOCK # sdbm 1.8.0 specific
-
-  def test_s_open_error
-    skip "doesn't support to avoid read access by owner on Windows" if /mswin|mingw/ =~ RUBY_PLATFORM
-    skip "skipped because root can open anything" if Process.uid == 0
-    assert_instance_of(SDBM, sdbm = SDBM.open("#{@tmpdir}/#{@prefix}", 0))
-    assert_raise(Errno::EACCES) {
-      SDBM.open("#{@tmpdir}/#{@prefix}", 0)
-    }
-    sdbm.close
-  end
-
-  def test_close
-    assert_instance_of(SDBM, sdbm = SDBM.open("#{@tmpdir}/#{@prefix}"))
-    assert_nil(sdbm.close)
-
-    # closed SDBM file
-    assert_raise(SDBMError) { sdbm.close }
-  end
-
-  def test_aref
-    assert_equal('bar', @sdbm['foo'] = 'bar')
-    assert_equal('bar', @sdbm['foo'])
-
-    assert_nil(@sdbm['bar'])
-  end
-
-  def test_fetch
-    assert_equal('bar', @sdbm['foo']='bar')
-    assert_equal('bar', @sdbm.fetch('foo'))
-
-    # key not found
-    assert_raise(IndexError) {
-      @sdbm.fetch('bar')
-    }
-
-    # test for `ifnone' arg
-    assert_equal('baz', @sdbm.fetch('bar', 'baz'))
-
-    # test for `ifnone' block
-    assert_equal('foobar', @sdbm.fetch('bar') {|key| 'foo' + key })
-  end
-
-  def test_aset
-    num = 0
-    2.times {|i|
-      assert_equal('foo', @sdbm['foo'] = 'foo')
-      assert_equal('foo', @sdbm['foo'])
-      assert_equal('bar', @sdbm['foo'] = 'bar')
-      assert_equal('bar', @sdbm['foo'])
-
-      num += 1 if i == 0
-      assert_equal(num, @sdbm.size)
-
-      # assign nil
-      assert_equal('', @sdbm['bar'] = '')
-      assert_equal('', @sdbm['bar'])
-
-      num += 1 if i == 0
-      assert_equal(num, @sdbm.size)
-
-      # empty string
-      assert_equal('', @sdbm[''] = '')
-      assert_equal('', @sdbm[''])
-
-      num += 1 if i == 0
-      assert_equal(num, @sdbm.size)
-
-      # Integer
-      assert_equal('200', @sdbm['100'] = '200')
-      assert_equal('200', @sdbm['100'])
-
-      num += 1 if i == 0
-      assert_equal(num, @sdbm.size)
-
-      # Big key and value
-      assert_equal('y' * 100, @sdbm['x' * 100] = 'y' * 100)
-      assert_equal('y' * 100, @sdbm['x' * 100])
-
-      num += 1 if i == 0
-      assert_equal(num, @sdbm.size)
-    }
-  end
-
-  def test_key
-    assert_equal('bar', @sdbm['foo'] = 'bar')
-    assert_equal('foo', @sdbm.key('bar'))
-    assert_nil(@sdbm['bar'])
-  end
-
-  def test_values_at
-    keys = %w(foo bar baz)
-    values = %w(FOO BAR BAZ)
-    @sdbm[keys[0]], @sdbm[keys[1]], @sdbm[keys[2]] = values
-    assert_equal(values.reverse, @sdbm.values_at(*keys.reverse))
-  end
-
-  def test_select_with_block
-    keys = %w(foo bar baz)
-    values = %w(FOO BAR BAZ)
-    @sdbm[keys[0]], @sdbm[keys[1]], @sdbm[keys[2]] = values
-    ret = @sdbm.select {|k,v|
-      assert_equal(k.upcase, v)
-      k != "bar"
-    }
-    assert_equal([['baz', 'BAZ'], ['foo', 'FOO']],
-		  ret.sort)
-  end
-
-  def test_length
-    num = 10
-    assert_equal(0, @sdbm.size)
-    num.times {|i|
-      i = i.to_s
-      @sdbm[i] = i
-    }
-    assert_equal(num, @sdbm.size)
-
-    @sdbm.shift
-
-    assert_equal(num - 1, @sdbm.size)
-  end
-
-  def test_empty?
-    assert_equal(true, @sdbm.empty?)
-    @sdbm['foo'] = 'FOO'
-    assert_equal(false, @sdbm.empty?)
-  end
-
-  def test_each_pair
-    n = 0
-    @sdbm.each_pair { n += 1 }
-    assert_equal(0, n)
-
-    keys = %w(foo bar baz)
-    values = %w(FOO BAR BAZ)
-
-    @sdbm[keys[0]], @sdbm[keys[1]], @sdbm[keys[2]] = values
-
-    n = 0
-    ret = @sdbm.each_pair {|key, val|
-      assert_not_nil(i = keys.index(key))
-      assert_equal(val, values[i])
-
-      n += 1
-    }
-    assert_equal(keys.size, n)
-    assert_equal(@sdbm, ret)
-  end
-
-  def test_each_value
-    n = 0
-    @sdbm.each_value { n += 1 }
-    assert_equal(0, n)
-
-    keys = %w(foo bar baz)
-    values = %w(FOO BAR BAZ)
-
-    @sdbm[keys[0]], @sdbm[keys[1]], @sdbm[keys[2]] = values
-
-    n = 0
-    ret = @sdbm.each_value {|val|
-      assert_not_nil(key = @sdbm.key(val))
-      assert_not_nil(i = keys.index(key))
-      assert_equal(val, values[i])
-
-      n += 1
-    }
-    assert_equal(keys.size, n)
-    assert_equal(@sdbm, ret)
-  end
-
-  def test_each_key
-    n = 0
-    @sdbm.each_key { n += 1 }
-    assert_equal(0, n)
-
-    keys = %w(foo bar baz)
-    values = %w(FOO BAR BAZ)
-
-    @sdbm[keys[0]], @sdbm[keys[1]], @sdbm[keys[2]] = values
-
-    n = 0
-    ret = @sdbm.each_key {|key|
-      assert_not_nil(i = keys.index(key))
-      assert_equal(@sdbm[key], values[i])
-
-      n += 1
-    }
-    assert_equal(keys.size, n)
-    assert_equal(@sdbm, ret)
-  end
-
-  def test_keys
-    assert_equal([], @sdbm.keys)
-
-    keys = %w(foo bar baz)
-    values = %w(FOO BAR BAZ)
-
-    @sdbm[keys[0]], @sdbm[keys[1]], @sdbm[keys[2]] = values
-
-    assert_equal(keys.sort, @sdbm.keys.sort)
-    assert_equal(values.sort, @sdbm.values.sort)
-  end
-
-  def test_values
-    test_keys
-  end
-
-  def test_shift
-    assert_nil(@sdbm.shift)
-    assert_equal(0, @sdbm.size)
-
-    keys = %w(foo bar baz)
-    values = %w(FOO BAR BAZ)
-
-    @sdbm[keys[0]], @sdbm[keys[1]], @sdbm[keys[2]] = values
-
-    ret_keys = []
-    ret_values = []
-    while ret = @sdbm.shift
-      ret_keys.push ret[0]
-      ret_values.push ret[1]
-
-      assert_equal(keys.size - ret_keys.size, @sdbm.size)
-    end
-
-    assert_equal(keys.sort, ret_keys.sort)
-    assert_equal(values.sort, ret_values.sort)
-  end
-
-  def test_delete
-    keys = %w(foo bar baz)
-    values = %w(FOO BAR BAZ)
-    key = keys[1]
-
-    assert_nil(@sdbm.delete(key))
-    assert_equal(0, @sdbm.size)
-
-    @sdbm[keys[0]], @sdbm[keys[1]], @sdbm[keys[2]] = values
-
-    assert_equal('BAR', @sdbm.delete(key))
-    assert_nil(@sdbm[key])
-    assert_equal(2, @sdbm.size)
-
-    assert_nil(@sdbm.delete(key))
-  end
-  def test_delete_with_block
-    key = 'no called block'
-    @sdbm[key] = 'foo'
-    assert_equal('foo', @sdbm.delete(key) {|k| k.replace 'called block'; :blockval})
-    assert_equal(0, @sdbm.size)
-
-    key = 'no called block'
-    assert_equal(:blockval, @sdbm.delete(key) {|k| k.replace 'called block'; :blockval})
-    assert_equal(0, @sdbm.size)
-  end
-
-  def test_delete_if
-    v = "0"
-    100.times {@sdbm[v] = v; v = v.next}
-
-    ret = @sdbm.delete_if {|key, val| key.to_i < 50}
-    assert_equal(@sdbm, ret)
-    check_size(50, @sdbm)
-
-    ret = @sdbm.delete_if {|key, val| key.to_i >= 50}
-    assert_equal(@sdbm, ret)
-    check_size(0, @sdbm)
-
-    # break
-    v = "0"
-    100.times {@sdbm[v] = v; v = v.next}
-    check_size(100, @sdbm)
-    n = 0;
-    @sdbm.delete_if {|key, val|
-      break if n > 50
-      n+=1
-      true
-    }
-    assert_equal(51, n)
-    check_size(49, @sdbm)
-
-    @sdbm.clear
-
-    # raise
-    v = "0"
-    100.times {@sdbm[v] = v; v = v.next}
-    check_size(100, @sdbm)
-    n = 0;
-    begin
-      @sdbm.delete_if {|key, val|
-	raise "runtime error" if n > 50
-	n+=1
-	true
-      }
-    rescue RuntimeError
-    end
-    assert_equal(51, n)
-    check_size(49, @sdbm)
-  end
-
-  def test_reject
-    v = "0"
-    100.times {@sdbm[v] = v; v = v.next}
-
-    hash = @sdbm.reject {|key, val| key.to_i < 50}
-    assert_instance_of(Hash, hash)
-    assert_equal(100, @sdbm.size)
-
-    assert_equal(50, hash.size)
-    hash.each_pair {|key,val|
-      assert_equal(false, key.to_i < 50)
-      assert_equal(key, val)
-    }
-
-    hash = @sdbm.reject {|key, val| key.to_i < 100}
-    assert_instance_of(Hash, hash)
-    assert_equal(true, hash.empty?)
-  end
-
-  def test_clear
-    v = "1"
-    100.times {v = v.next; @sdbm[v] = v}
-
-    assert_equal(@sdbm, @sdbm.clear)
-
-    # validate SDBM#size
-    i = 0
-    @sdbm.each { i += 1 }
-    assert_equal(@sdbm.size, i)
-    assert_equal(0, i)
-  end
-
-  def test_invert
-    v = "0"
-    100.times {@sdbm[v] = v; v = v.next}
-
-    hash = @sdbm.invert
-    assert_instance_of(Hash, hash)
-    assert_equal(100, hash.size)
-    hash.each_pair {|key, val|
-      assert_equal(key.to_i, val.to_i)
-    }
-  end
-
-  def test_update
-    hash = {}
-    v = "0"
-    100.times {v = v.next; hash[v] = v}
-
-    @sdbm["101"] = "101"
-    @sdbm.update hash
-    assert_equal(101, @sdbm.size)
-    @sdbm.each_pair {|key, val|
-      assert_equal(key.to_i, val.to_i)
-    }
-  end
-
-  def test_replace
-    hash = {}
-    v = "0"
-    100.times {v = v.next; hash[v] = v}
-
-    @sdbm["101"] = "101"
-    @sdbm.replace hash
-    assert_equal(100, @sdbm.size)
-    @sdbm.each_pair {|key, val|
-      assert_equal(key.to_i, val.to_i)
-    }
-  end
-
-  def test_haskey?
-    assert_equal('bar', @sdbm['foo']='bar')
-    assert_equal(true,  @sdbm.has_key?('foo'))
-    assert_equal(false, @sdbm.has_key?('bar'))
-  end
-
-  def test_has_value?
-    assert_equal('bar', @sdbm['foo']='bar')
-    assert_equal(true,  @sdbm.has_value?('bar'))
-    assert_equal(false, @sdbm.has_value?('foo'))
-  end
-
-  def test_to_a
-    v = "0"
-    100.times {v = v.next; @sdbm[v] = v}
-
-    ary = @sdbm.to_a
-    assert_instance_of(Array, ary)
-    assert_equal(100, ary.size)
-    ary.each {|key,val|
-      assert_equal(key.to_i, val.to_i)
-    }
-  end
-
-  def test_to_hash
-    v = "0"
-    100.times {v = v.next; @sdbm[v] = v}
-
-    hash = @sdbm.to_hash
-    assert_instance_of(Hash, hash)
-    assert_equal(100, hash.size)
-    hash.each {|key,val|
-      assert_equal(key.to_i, val.to_i)
-    }
-  end
-
-  def test_closed
-    assert_equal(false, @sdbm.closed?)
-    @sdbm.close
-    assert_equal(true, @sdbm.closed?)
-    @sdbm = SDBM.new(@path)
-  end
-
-  def test_readonly
-    skip "skipped because root can read anything" if /mswin|mingw/ !~ RUBY_PLATFORM && Process.uid == 0
-    @sdbm["bar"] = "baz"
-    @sdbm.close
-    File.chmod(0444, @path + ".dir")
-    File.chmod(0444, @path + ".pag")
-    @sdbm = SDBM.new(@path)
-    assert_raise(SDBMError) { @sdbm["bar"] = "foo" }
-    assert_raise(SDBMError) { @sdbm.delete("bar") }
-    assert_raise(SDBMError) { @sdbm.delete_if { true } }
-    assert_raise(SDBMError) { @sdbm.clear }
-    assert_nil(@sdbm.store("bar", nil))
-  end
-
-  def test_update2
-    obj = Object.new
-    def obj.each_pair
-      yield []
-    end
-    assert_raise(ArgumentError) { @sdbm.update(obj) }
-  end
-end if defined? SDBM
-