зеркало из https://github.com/mozilla/pjs.git
1291 строка
30 KiB
C
1291 строка
30 KiB
C
/*-
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Margo Seltzer.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(unix)
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#define MY_LSEEK lseek
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#else
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#define MY_LSEEK new_lseek
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extern long new_lseek(int fd, long pos, int start);
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#endif
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)hash_page.c 8.7 (Berkeley) 8/16/94";
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#endif /* LIBC_SCCS and not lint */
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#include "watcomfx.h"
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/*
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* PACKAGE: hashing
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*
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* DESCRIPTION:
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* Page manipulation for hashing package.
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*
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* ROUTINES:
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*
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* External
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* __get_page
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* __add_ovflpage
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* Internal
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* overflow_page
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* open_temp
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*/
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#ifndef macintosh
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#include <sys/types.h>
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#endif
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#if defined(macintosh)
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#include <unistd.h>
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#endif
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#include <errno.h>
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#include <fcntl.h>
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#if defined(_WIN32) || defined(_WINDOWS)
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#include <io.h>
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#endif
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if !defined(_WIN32) && !defined(_WINDOWS) && !defined(macintosh) && !defined(XP_OS2_VACPP)
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#include <unistd.h>
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#endif
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#include <assert.h>
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#include "mcom_db.h"
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#include "hash.h"
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#include "page.h"
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/* #include "extern.h" */
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extern int mkstempflags(char *path, int extraFlags);
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static uint32 *fetch_bitmap __P((HTAB *, uint32));
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static uint32 first_free __P((uint32));
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static int open_temp __P((HTAB *));
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static uint16 overflow_page __P((HTAB *));
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static void squeeze_key __P((uint16 *, const DBT *, const DBT *));
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static int ugly_split
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__P((HTAB *, uint32, BUFHEAD *, BUFHEAD *, int, int));
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#define PAGE_INIT(P) { \
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((uint16 *)(P))[0] = 0; \
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((uint16 *)(P))[1] = hashp->BSIZE - 3 * sizeof(uint16); \
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((uint16 *)(P))[2] = hashp->BSIZE; \
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}
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/* implement a new lseek using lseek that
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* writes zero's when extending a file
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* beyond the end.
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*/
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long new_lseek(int fd, long offset, int origin)
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{
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long cur_pos=0;
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long end_pos=0;
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long seek_pos=0;
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if(origin == SEEK_CUR)
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{
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if(offset < 1)
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return(lseek(fd, offset, SEEK_CUR));
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cur_pos = lseek(fd, 0, SEEK_CUR);
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if(cur_pos < 0)
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return(cur_pos);
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}
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end_pos = lseek(fd, 0, SEEK_END);
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if(end_pos < 0)
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return(end_pos);
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if(origin == SEEK_SET)
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seek_pos = offset;
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else if(origin == SEEK_CUR)
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seek_pos = cur_pos + offset;
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else if(origin == SEEK_END)
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seek_pos = end_pos + offset;
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else
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{
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assert(0);
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return(-1);
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}
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/* the seek position desired is before the
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* end of the file. We don't need
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* to do anything special except the seek.
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*/
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if(seek_pos <= end_pos)
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return(lseek(fd, seek_pos, SEEK_SET));
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/* the seek position is beyond the end of the
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* file. Write zero's to the end.
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*
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* we are already at the end of the file so
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* we just need to "write()" zeros for the
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* difference between seek_pos-end_pos and
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* then seek to the position to finish
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* the call
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*/
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{
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char buffer[1024];
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long len = seek_pos-end_pos;
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memset(&buffer, 0, 1024);
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while(len > 0)
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{
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write(fd, (char*)&buffer, (size_t)(1024 > len ? len : 1024));
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len -= 1024;
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}
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return(lseek(fd, seek_pos, SEEK_SET));
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}
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}
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/*
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* This is called AFTER we have verified that there is room on the page for
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* the pair (PAIRFITS has returned true) so we go right ahead and start moving
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* stuff on.
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*/
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static void
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putpair(char *p, const DBT *key, DBT * val)
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{
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register uint16 *bp, n, off;
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bp = (uint16 *)p;
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/* Enter the key first. */
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n = bp[0];
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off = OFFSET(bp) - key->size;
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memmove(p + off, key->data, key->size);
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bp[++n] = off;
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/* Now the data. */
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off -= val->size;
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memmove(p + off, val->data, val->size);
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bp[++n] = off;
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/* Adjust page info. */
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bp[0] = n;
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bp[n + 1] = off - ((n + 3) * sizeof(uint16));
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bp[n + 2] = off;
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}
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/*
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* Returns:
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* 0 OK
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* -1 error
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*/
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extern int
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__delpair(HTAB *hashp, BUFHEAD *bufp, int ndx)
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{
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register uint16 *bp, newoff;
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register int n;
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uint16 pairlen;
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bp = (uint16 *)bufp->page;
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n = bp[0];
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if (bp[ndx + 1] < REAL_KEY)
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return (__big_delete(hashp, bufp));
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if (ndx != 1)
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newoff = bp[ndx - 1];
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else
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newoff = hashp->BSIZE;
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pairlen = newoff - bp[ndx + 1];
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if (ndx != (n - 1)) {
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/* Hard Case -- need to shuffle keys */
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register int i;
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register char *src = bufp->page + (int)OFFSET(bp);
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uint32 dst_offset = (uint32)OFFSET(bp) + (uint32)pairlen;
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register char *dst = bufp->page + dst_offset;
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uint32 length = bp[ndx + 1] - OFFSET(bp);
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/*
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* +-----------+XXX+---------+XXX+---------+---------> +infinity
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* | | | |
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* 0 src_offset dst_offset BSIZE
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*
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* Dst_offset is > src_offset, so if src_offset were bad, dst_offset
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* would be too, therefore we check only dst_offset.
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*
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* If dst_offset is >= BSIZE, either OFFSET(bp), or pairlen, or both
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* is corrupted.
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*
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* Once we know dst_offset is < BSIZE, we can subtract it from BSIZE
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* to get an upper bound on length.
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*/
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if(dst_offset > (uint32)hashp->BSIZE)
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return(DATABASE_CORRUPTED_ERROR);
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if(length > (uint32)(hashp->BSIZE - dst_offset))
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return(DATABASE_CORRUPTED_ERROR);
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memmove(dst, src, length);
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/* Now adjust the pointers */
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for (i = ndx + 2; i <= n; i += 2) {
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if (bp[i + 1] == OVFLPAGE) {
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bp[i - 2] = bp[i];
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bp[i - 1] = bp[i + 1];
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} else {
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bp[i - 2] = bp[i] + pairlen;
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bp[i - 1] = bp[i + 1] + pairlen;
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}
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}
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}
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/* Finally adjust the page data */
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bp[n] = OFFSET(bp) + pairlen;
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bp[n - 1] = bp[n + 1] + pairlen + 2 * sizeof(uint16);
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bp[0] = n - 2;
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hashp->NKEYS--;
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bufp->flags |= BUF_MOD;
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return (0);
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}
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/*
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* Returns:
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* 0 ==> OK
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* -1 ==> Error
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*/
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extern int
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__split_page(HTAB *hashp, uint32 obucket, uint32 nbucket)
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{
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register BUFHEAD *new_bufp, *old_bufp;
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register uint16 *ino;
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register uint16 *tmp_uint16_array;
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register char *np;
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DBT key, val;
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uint16 n, ndx;
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int retval;
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uint16 copyto, diff, moved;
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size_t off;
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char *op;
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copyto = (uint16)hashp->BSIZE;
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off = (uint16)hashp->BSIZE;
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old_bufp = __get_buf(hashp, obucket, NULL, 0);
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if (old_bufp == NULL)
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return (-1);
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new_bufp = __get_buf(hashp, nbucket, NULL, 0);
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if (new_bufp == NULL)
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return (-1);
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old_bufp->flags |= (BUF_MOD | BUF_PIN);
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new_bufp->flags |= (BUF_MOD | BUF_PIN);
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ino = (uint16 *)(op = old_bufp->page);
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np = new_bufp->page;
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moved = 0;
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for (n = 1, ndx = 1; n < ino[0]; n += 2) {
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if (ino[n + 1] < REAL_KEY) {
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retval = ugly_split(hashp, obucket, old_bufp, new_bufp,
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(int)copyto, (int)moved);
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old_bufp->flags &= ~BUF_PIN;
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new_bufp->flags &= ~BUF_PIN;
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return (retval);
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}
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key.data = (uint8 *)op + ino[n];
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/* check here for ino[n] being greater than
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* off. If it is then the database has
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* been corrupted.
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*/
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if(ino[n] > off)
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return(DATABASE_CORRUPTED_ERROR);
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key.size = off - ino[n];
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#ifdef DEBUG
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/* make sure the size is positive */
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assert(((int)key.size) > -1);
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#endif
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if (__call_hash(hashp, (char *)key.data, key.size) == obucket) {
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/* Don't switch page */
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diff = copyto - off;
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if (diff) {
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copyto = ino[n + 1] + diff;
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memmove(op + copyto, op + ino[n + 1],
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off - ino[n + 1]);
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ino[ndx] = copyto + ino[n] - ino[n + 1];
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ino[ndx + 1] = copyto;
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} else
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copyto = ino[n + 1];
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ndx += 2;
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} else {
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/* Switch page */
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val.data = (uint8 *)op + ino[n + 1];
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val.size = ino[n] - ino[n + 1];
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/* if the pair doesn't fit something is horribly
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* wrong. LJM
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*/
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tmp_uint16_array = (uint16*)np;
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if(!PAIRFITS(tmp_uint16_array, &key, &val))
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return(DATABASE_CORRUPTED_ERROR);
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putpair(np, &key, &val);
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moved += 2;
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}
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off = ino[n + 1];
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}
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/* Now clean up the page */
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ino[0] -= moved;
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FREESPACE(ino) = copyto - sizeof(uint16) * (ino[0] + 3);
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OFFSET(ino) = copyto;
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#ifdef DEBUG3
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(void)fprintf(stderr, "split %d/%d\n",
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((uint16 *)np)[0] / 2,
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((uint16 *)op)[0] / 2);
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#endif
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/* unpin both pages */
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old_bufp->flags &= ~BUF_PIN;
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new_bufp->flags &= ~BUF_PIN;
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return (0);
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}
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/*
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* Called when we encounter an overflow or big key/data page during split
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* handling. This is special cased since we have to begin checking whether
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* the key/data pairs fit on their respective pages and because we may need
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* overflow pages for both the old and new pages.
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*
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* The first page might be a page with regular key/data pairs in which case
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* we have a regular overflow condition and just need to go on to the next
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* page or it might be a big key/data pair in which case we need to fix the
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* big key/data pair.
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*
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* Returns:
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* 0 ==> success
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* -1 ==> failure
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*/
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/* the maximum number of loops we will allow UGLY split to chew
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* on before we assume the database is corrupted and throw it
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* away.
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*/
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#define MAX_UGLY_SPLIT_LOOPS 10000
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static int
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ugly_split(HTAB *hashp, uint32 obucket, BUFHEAD *old_bufp,
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BUFHEAD *new_bufp,/* Same as __split_page. */ int copyto, int moved)
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/* int copyto; First byte on page which contains key/data values. */
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/* int moved; Number of pairs moved to new page. */
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{
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register BUFHEAD *bufp; /* Buffer header for ino */
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register uint16 *ino; /* Page keys come off of */
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register uint16 *np; /* New page */
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register uint16 *op; /* Page keys go on to if they aren't moving */
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uint32 loop_detection=0;
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BUFHEAD *last_bfp; /* Last buf header OVFL needing to be freed */
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DBT key, val;
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SPLIT_RETURN ret;
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uint16 n, off, ov_addr, scopyto;
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char *cino; /* Character value of ino */
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int status;
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bufp = old_bufp;
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ino = (uint16 *)old_bufp->page;
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np = (uint16 *)new_bufp->page;
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op = (uint16 *)old_bufp->page;
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last_bfp = NULL;
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scopyto = (uint16)copyto; /* ANSI */
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n = ino[0] - 1;
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while (n < ino[0]) {
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/* this function goes nuts sometimes and never returns.
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* I havent found the problem yet but I need a solution
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* so if we loop too often we assume a database curruption error
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* :LJM
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*/
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loop_detection++;
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if(loop_detection > MAX_UGLY_SPLIT_LOOPS)
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return DATABASE_CORRUPTED_ERROR;
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if (ino[2] < REAL_KEY && ino[2] != OVFLPAGE) {
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if ((status = __big_split(hashp, old_bufp,
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new_bufp, bufp, bufp->addr, obucket, &ret)))
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return (status);
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old_bufp = ret.oldp;
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if (!old_bufp)
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return (-1);
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op = (uint16 *)old_bufp->page;
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new_bufp = ret.newp;
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if (!new_bufp)
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return (-1);
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np = (uint16 *)new_bufp->page;
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bufp = ret.nextp;
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if (!bufp)
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return (0);
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cino = (char *)bufp->page;
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ino = (uint16 *)cino;
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last_bfp = ret.nextp;
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} else if (ino[n + 1] == OVFLPAGE) {
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ov_addr = ino[n];
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/*
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* Fix up the old page -- the extra 2 are the fields
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* which contained the overflow information.
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*/
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ino[0] -= (moved + 2);
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FREESPACE(ino) =
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scopyto - sizeof(uint16) * (ino[0] + 3);
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OFFSET(ino) = scopyto;
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bufp = __get_buf(hashp, ov_addr, bufp, 0);
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if (!bufp)
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return (-1);
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ino = (uint16 *)bufp->page;
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n = 1;
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scopyto = hashp->BSIZE;
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moved = 0;
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if (last_bfp)
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__free_ovflpage(hashp, last_bfp);
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last_bfp = bufp;
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}
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/* Move regular sized pairs of there are any */
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off = hashp->BSIZE;
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for (n = 1; (n < ino[0]) && (ino[n + 1] >= REAL_KEY); n += 2) {
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cino = (char *)ino;
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key.data = (uint8 *)cino + ino[n];
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key.size = off - ino[n];
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val.data = (uint8 *)cino + ino[n + 1];
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val.size = ino[n] - ino[n + 1];
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off = ino[n + 1];
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if (__call_hash(hashp, (char*)key.data, key.size) == obucket) {
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/* Keep on old page */
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if (PAIRFITS(op, (&key), (&val)))
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putpair((char *)op, &key, &val);
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else {
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old_bufp =
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__add_ovflpage(hashp, old_bufp);
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if (!old_bufp)
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return (-1);
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op = (uint16 *)old_bufp->page;
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putpair((char *)op, &key, &val);
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|
}
|
|
old_bufp->flags |= BUF_MOD;
|
|
} else {
|
|
/* Move to new page */
|
|
if (PAIRFITS(np, (&key), (&val)))
|
|
putpair((char *)np, &key, &val);
|
|
else {
|
|
new_bufp =
|
|
__add_ovflpage(hashp, new_bufp);
|
|
if (!new_bufp)
|
|
return (-1);
|
|
np = (uint16 *)new_bufp->page;
|
|
putpair((char *)np, &key, &val);
|
|
}
|
|
new_bufp->flags |= BUF_MOD;
|
|
}
|
|
}
|
|
}
|
|
if (last_bfp)
|
|
__free_ovflpage(hashp, last_bfp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Add the given pair to the page
|
|
*
|
|
* Returns:
|
|
* 0 ==> OK
|
|
* 1 ==> failure
|
|
*/
|
|
extern int
|
|
__addel(HTAB *hashp, BUFHEAD *bufp, const DBT *key, const DBT * val)
|
|
{
|
|
register uint16 *bp, *sop;
|
|
int do_expand;
|
|
|
|
bp = (uint16 *)bufp->page;
|
|
do_expand = 0;
|
|
while (bp[0] && (bp[2] < REAL_KEY || bp[bp[0]] < REAL_KEY))
|
|
/* Exception case */
|
|
if (bp[2] == FULL_KEY_DATA && bp[0] == 2)
|
|
/* This is the last page of a big key/data pair
|
|
and we need to add another page */
|
|
break;
|
|
else if (bp[2] < REAL_KEY && bp[bp[0]] != OVFLPAGE) {
|
|
bufp = __get_buf(hashp, bp[bp[0] - 1], bufp, 0);
|
|
if (!bufp)
|
|
{
|
|
#ifdef DEBUG
|
|
assert(0);
|
|
#endif
|
|
return (-1);
|
|
}
|
|
bp = (uint16 *)bufp->page;
|
|
} else
|
|
/* Try to squeeze key on this page */
|
|
if (FREESPACE(bp) > PAIRSIZE(key, val)) {
|
|
{
|
|
squeeze_key(bp, key, val);
|
|
|
|
/* LJM: I added this because I think it was
|
|
* left out on accident.
|
|
* if this isn't incremented nkeys will not
|
|
* be the actual number of keys in the db.
|
|
*/
|
|
hashp->NKEYS++;
|
|
return (0);
|
|
}
|
|
} else {
|
|
bufp = __get_buf(hashp, bp[bp[0] - 1], bufp, 0);
|
|
if (!bufp)
|
|
{
|
|
#ifdef DEBUG
|
|
assert(0);
|
|
#endif
|
|
return (-1);
|
|
}
|
|
bp = (uint16 *)bufp->page;
|
|
}
|
|
|
|
if (PAIRFITS(bp, key, val))
|
|
putpair(bufp->page, key, (DBT *)val);
|
|
else {
|
|
do_expand = 1;
|
|
bufp = __add_ovflpage(hashp, bufp);
|
|
if (!bufp)
|
|
{
|
|
#ifdef DEBUG
|
|
assert(0);
|
|
#endif
|
|
return (-1);
|
|
}
|
|
sop = (uint16 *)bufp->page;
|
|
|
|
if (PAIRFITS(sop, key, val))
|
|
putpair((char *)sop, key, (DBT *)val);
|
|
else
|
|
if (__big_insert(hashp, bufp, key, val))
|
|
{
|
|
#ifdef DEBUG
|
|
assert(0);
|
|
#endif
|
|
return (-1);
|
|
}
|
|
}
|
|
bufp->flags |= BUF_MOD;
|
|
/*
|
|
* If the average number of keys per bucket exceeds the fill factor,
|
|
* expand the table.
|
|
*/
|
|
hashp->NKEYS++;
|
|
if (do_expand ||
|
|
(hashp->NKEYS / (hashp->MAX_BUCKET + 1) > hashp->FFACTOR))
|
|
return (__expand_table(hashp));
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
*
|
|
* Returns:
|
|
* pointer on success
|
|
* NULL on error
|
|
*/
|
|
extern BUFHEAD *
|
|
__add_ovflpage(HTAB *hashp, BUFHEAD *bufp)
|
|
{
|
|
register uint16 *sp;
|
|
uint16 ndx, ovfl_num;
|
|
#ifdef DEBUG1
|
|
int tmp1, tmp2;
|
|
#endif
|
|
sp = (uint16 *)bufp->page;
|
|
|
|
/* Check if we are dynamically determining the fill factor */
|
|
if (hashp->FFACTOR == DEF_FFACTOR) {
|
|
hashp->FFACTOR = sp[0] >> 1;
|
|
if (hashp->FFACTOR < MIN_FFACTOR)
|
|
hashp->FFACTOR = MIN_FFACTOR;
|
|
}
|
|
bufp->flags |= BUF_MOD;
|
|
ovfl_num = overflow_page(hashp);
|
|
#ifdef DEBUG1
|
|
tmp1 = bufp->addr;
|
|
tmp2 = bufp->ovfl ? bufp->ovfl->addr : 0;
|
|
#endif
|
|
if (!ovfl_num || !(bufp->ovfl = __get_buf(hashp, ovfl_num, bufp, 1)))
|
|
return (NULL);
|
|
bufp->ovfl->flags |= BUF_MOD;
|
|
#ifdef DEBUG1
|
|
(void)fprintf(stderr, "ADDOVFLPAGE: %d->ovfl was %d is now %d\n",
|
|
tmp1, tmp2, bufp->ovfl->addr);
|
|
#endif
|
|
ndx = sp[0];
|
|
/*
|
|
* Since a pair is allocated on a page only if there's room to add
|
|
* an overflow page, we know that the OVFL information will fit on
|
|
* the page.
|
|
*/
|
|
sp[ndx + 4] = OFFSET(sp);
|
|
sp[ndx + 3] = FREESPACE(sp) - OVFLSIZE;
|
|
sp[ndx + 1] = ovfl_num;
|
|
sp[ndx + 2] = OVFLPAGE;
|
|
sp[0] = ndx + 2;
|
|
#ifdef HASH_STATISTICS
|
|
hash_overflows++;
|
|
#endif
|
|
return (bufp->ovfl);
|
|
}
|
|
|
|
/*
|
|
* Returns:
|
|
* 0 indicates SUCCESS
|
|
* -1 indicates FAILURE
|
|
*/
|
|
extern int
|
|
__get_page(HTAB *hashp,
|
|
char * p,
|
|
uint32 bucket,
|
|
int is_bucket,
|
|
int is_disk,
|
|
int is_bitmap)
|
|
{
|
|
register int fd, page;
|
|
size_t size;
|
|
int rsize;
|
|
uint16 *bp;
|
|
|
|
fd = hashp->fp;
|
|
size = hashp->BSIZE;
|
|
|
|
if ((fd == -1) || !is_disk) {
|
|
PAGE_INIT(p);
|
|
return (0);
|
|
}
|
|
if (is_bucket)
|
|
page = BUCKET_TO_PAGE(bucket);
|
|
else
|
|
page = OADDR_TO_PAGE(bucket);
|
|
if ((MY_LSEEK(fd, (off_t)page << hashp->BSHIFT, SEEK_SET) == -1) ||
|
|
((rsize = read(fd, p, size)) == -1))
|
|
return (-1);
|
|
|
|
bp = (uint16 *)p;
|
|
if (!rsize)
|
|
bp[0] = 0; /* We hit the EOF, so initialize a new page */
|
|
else
|
|
if ((unsigned)rsize != size) {
|
|
errno = EFTYPE;
|
|
return (-1);
|
|
}
|
|
|
|
if (!is_bitmap && !bp[0]) {
|
|
PAGE_INIT(p);
|
|
} else {
|
|
|
|
#ifdef DEBUG
|
|
if(BYTE_ORDER == LITTLE_ENDIAN)
|
|
{
|
|
int is_little_endian;
|
|
is_little_endian = BYTE_ORDER;
|
|
}
|
|
else if(BYTE_ORDER == BIG_ENDIAN)
|
|
{
|
|
int is_big_endian;
|
|
is_big_endian = BYTE_ORDER;
|
|
}
|
|
else
|
|
{
|
|
assert(0);
|
|
}
|
|
#endif
|
|
|
|
if (hashp->LORDER != BYTE_ORDER) {
|
|
register int i, max;
|
|
|
|
if (is_bitmap) {
|
|
max = hashp->BSIZE >> 2; /* divide by 4 */
|
|
for (i = 0; i < max; i++)
|
|
M_32_SWAP(((int *)p)[i]);
|
|
} else {
|
|
M_16_SWAP(bp[0]);
|
|
max = bp[0] + 2;
|
|
|
|
/* bound the size of max by
|
|
* the maximum number of entries
|
|
* in the array
|
|
*/
|
|
if((unsigned)max > (size / sizeof(uint16)))
|
|
return(DATABASE_CORRUPTED_ERROR);
|
|
|
|
/* do the byte order swap
|
|
*/
|
|
for (i = 1; i <= max; i++)
|
|
M_16_SWAP(bp[i]);
|
|
}
|
|
}
|
|
|
|
/* check the validity of the page here
|
|
* (after doing byte order swaping if necessary)
|
|
*/
|
|
if(!is_bitmap && bp[0] != 0)
|
|
{
|
|
uint16 num_keys = bp[0];
|
|
uint16 offset;
|
|
uint16 i;
|
|
|
|
/* bp[0] is supposed to be the number of
|
|
* entries currently in the page. If
|
|
* bp[0] is too large (larger than the whole
|
|
* page) then the page is corrupted
|
|
*/
|
|
if(bp[0] > (size / sizeof(uint16)))
|
|
return(DATABASE_CORRUPTED_ERROR);
|
|
|
|
/* bound free space */
|
|
if(FREESPACE(bp) > size)
|
|
return(DATABASE_CORRUPTED_ERROR);
|
|
|
|
/* check each key and data offset to make
|
|
* sure they are all within bounds they
|
|
* should all be less than the previous
|
|
* offset as well.
|
|
*/
|
|
offset = size;
|
|
for(i=1 ; i <= num_keys; i+=2)
|
|
{
|
|
/* ignore overflow pages etc. */
|
|
if(bp[i+1] >= REAL_KEY)
|
|
{
|
|
|
|
if(bp[i] > offset || bp[i+1] > bp[i])
|
|
return(DATABASE_CORRUPTED_ERROR);
|
|
|
|
offset = bp[i+1];
|
|
}
|
|
else
|
|
{
|
|
/* there are no other valid keys after
|
|
* seeing a non REAL_KEY
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Write page p to disk
|
|
*
|
|
* Returns:
|
|
* 0 ==> OK
|
|
* -1 ==>failure
|
|
*/
|
|
extern int
|
|
__put_page(HTAB *hashp, char *p, uint32 bucket, int is_bucket, int is_bitmap)
|
|
{
|
|
register int fd, page;
|
|
size_t size;
|
|
int wsize;
|
|
off_t offset;
|
|
|
|
size = hashp->BSIZE;
|
|
if ((hashp->fp == -1) && open_temp(hashp))
|
|
return (-1);
|
|
fd = hashp->fp;
|
|
|
|
if (hashp->LORDER != BYTE_ORDER) {
|
|
register int i;
|
|
register int max;
|
|
|
|
if (is_bitmap) {
|
|
max = hashp->BSIZE >> 2; /* divide by 4 */
|
|
for (i = 0; i < max; i++)
|
|
M_32_SWAP(((int *)p)[i]);
|
|
} else {
|
|
max = ((uint16 *)p)[0] + 2;
|
|
|
|
/* bound the size of max by
|
|
* the maximum number of entries
|
|
* in the array
|
|
*/
|
|
if((unsigned)max > (size / sizeof(uint16)))
|
|
return(DATABASE_CORRUPTED_ERROR);
|
|
|
|
for (i = 0; i <= max; i++)
|
|
M_16_SWAP(((uint16 *)p)[i]);
|
|
|
|
}
|
|
}
|
|
|
|
if (is_bucket)
|
|
page = BUCKET_TO_PAGE(bucket);
|
|
else
|
|
page = OADDR_TO_PAGE(bucket);
|
|
offset = (off_t)page << hashp->BSHIFT;
|
|
if ((MY_LSEEK(fd, offset, SEEK_SET) == -1) ||
|
|
((wsize = write(fd, p, size)) == -1))
|
|
/* Errno is set */
|
|
return (-1);
|
|
if ((unsigned)wsize != size) {
|
|
errno = EFTYPE;
|
|
return (-1);
|
|
}
|
|
#if defined(_WIN32) || defined(_WINDOWS)
|
|
if (offset + size > hashp->file_size) {
|
|
hashp->updateEOF = 1;
|
|
}
|
|
#endif
|
|
/* put the page back the way it was so that it isn't byteswapped
|
|
* if it remains in memory - LJM
|
|
*/
|
|
if (hashp->LORDER != BYTE_ORDER) {
|
|
register int i;
|
|
register int max;
|
|
|
|
if (is_bitmap) {
|
|
max = hashp->BSIZE >> 2; /* divide by 4 */
|
|
for (i = 0; i < max; i++)
|
|
M_32_SWAP(((int *)p)[i]);
|
|
} else {
|
|
uint16 *bp = (uint16 *)p;
|
|
|
|
M_16_SWAP(bp[0]);
|
|
max = bp[0] + 2;
|
|
|
|
/* no need to bound the size if max again
|
|
* since it was done already above
|
|
*/
|
|
|
|
/* do the byte order re-swap
|
|
*/
|
|
for (i = 1; i <= max; i++)
|
|
M_16_SWAP(bp[i]);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
#define BYTE_MASK ((1 << INT_BYTE_SHIFT) -1)
|
|
/*
|
|
* Initialize a new bitmap page. Bitmap pages are left in memory
|
|
* once they are read in.
|
|
*/
|
|
extern int
|
|
__ibitmap(HTAB *hashp, int pnum, int nbits, int ndx)
|
|
{
|
|
uint32 *ip;
|
|
size_t clearbytes, clearints;
|
|
|
|
if ((ip = (uint32 *)malloc((size_t)hashp->BSIZE)) == NULL)
|
|
return (1);
|
|
hashp->nmaps++;
|
|
clearints = ((nbits - 1) >> INT_BYTE_SHIFT) + 1;
|
|
clearbytes = clearints << INT_TO_BYTE;
|
|
(void)memset((char *)ip, 0, clearbytes);
|
|
(void)memset(((char *)ip) + clearbytes, 0xFF,
|
|
hashp->BSIZE - clearbytes);
|
|
ip[clearints - 1] = ALL_SET << (nbits & BYTE_MASK);
|
|
SETBIT(ip, 0);
|
|
hashp->BITMAPS[ndx] = (uint16)pnum;
|
|
hashp->mapp[ndx] = ip;
|
|
return (0);
|
|
}
|
|
|
|
static uint32
|
|
first_free(uint32 map)
|
|
{
|
|
register uint32 i, mask;
|
|
|
|
mask = 0x1;
|
|
for (i = 0; i < BITS_PER_MAP; i++) {
|
|
if (!(mask & map))
|
|
return (i);
|
|
mask = mask << 1;
|
|
}
|
|
return (i);
|
|
}
|
|
|
|
static uint16
|
|
overflow_page(HTAB *hashp)
|
|
{
|
|
register uint32 *freep=NULL;
|
|
register int max_free, offset, splitnum;
|
|
uint16 addr;
|
|
uint32 i;
|
|
int bit, first_page, free_bit, free_page, in_use_bits, j;
|
|
#ifdef DEBUG2
|
|
int tmp1, tmp2;
|
|
#endif
|
|
splitnum = hashp->OVFL_POINT;
|
|
max_free = hashp->SPARES[splitnum];
|
|
|
|
free_page = (max_free - 1) >> (hashp->BSHIFT + BYTE_SHIFT);
|
|
free_bit = (max_free - 1) & ((hashp->BSIZE << BYTE_SHIFT) - 1);
|
|
|
|
/* Look through all the free maps to find the first free block */
|
|
first_page = hashp->LAST_FREED >>(hashp->BSHIFT + BYTE_SHIFT);
|
|
for ( i = first_page; i <= (unsigned)free_page; i++ ) {
|
|
if (!(freep = (uint32 *)hashp->mapp[i]) &&
|
|
!(freep = fetch_bitmap(hashp, i)))
|
|
return (0);
|
|
if (i == (unsigned)free_page)
|
|
in_use_bits = free_bit;
|
|
else
|
|
in_use_bits = (hashp->BSIZE << BYTE_SHIFT) - 1;
|
|
|
|
if (i == (unsigned)first_page) {
|
|
bit = hashp->LAST_FREED &
|
|
((hashp->BSIZE << BYTE_SHIFT) - 1);
|
|
j = bit / BITS_PER_MAP;
|
|
bit = bit & ~(BITS_PER_MAP - 1);
|
|
} else {
|
|
bit = 0;
|
|
j = 0;
|
|
}
|
|
for (; bit <= in_use_bits; j++, bit += BITS_PER_MAP)
|
|
if (freep[j] != ALL_SET)
|
|
goto found;
|
|
}
|
|
|
|
/* No Free Page Found */
|
|
hashp->LAST_FREED = hashp->SPARES[splitnum];
|
|
hashp->SPARES[splitnum]++;
|
|
offset = hashp->SPARES[splitnum] -
|
|
(splitnum ? hashp->SPARES[splitnum - 1] : 0);
|
|
|
|
#define OVMSG "HASH: Out of overflow pages. Increase page size\n"
|
|
if (offset > SPLITMASK) {
|
|
if (++splitnum >= NCACHED) {
|
|
#ifndef macintosh
|
|
(void)write(STDERR_FILENO, OVMSG, sizeof(OVMSG) - 1);
|
|
#endif
|
|
return (0);
|
|
}
|
|
hashp->OVFL_POINT = splitnum;
|
|
hashp->SPARES[splitnum] = hashp->SPARES[splitnum-1];
|
|
hashp->SPARES[splitnum-1]--;
|
|
offset = 1;
|
|
}
|
|
|
|
/* Check if we need to allocate a new bitmap page */
|
|
if (free_bit == (hashp->BSIZE << BYTE_SHIFT) - 1) {
|
|
free_page++;
|
|
if (free_page >= NCACHED) {
|
|
#ifndef macintosh
|
|
(void)write(STDERR_FILENO, OVMSG, sizeof(OVMSG) - 1);
|
|
#endif
|
|
return (0);
|
|
}
|
|
/*
|
|
* This is tricky. The 1 indicates that you want the new page
|
|
* allocated with 1 clear bit. Actually, you are going to
|
|
* allocate 2 pages from this map. The first is going to be
|
|
* the map page, the second is the overflow page we were
|
|
* looking for. The init_bitmap routine automatically, sets
|
|
* the first bit of itself to indicate that the bitmap itself
|
|
* is in use. We would explicitly set the second bit, but
|
|
* don't have to if we tell init_bitmap not to leave it clear
|
|
* in the first place.
|
|
*/
|
|
if (__ibitmap(hashp,
|
|
(int)OADDR_OF(splitnum, offset), 1, free_page))
|
|
return (0);
|
|
hashp->SPARES[splitnum]++;
|
|
#ifdef DEBUG2
|
|
free_bit = 2;
|
|
#endif
|
|
offset++;
|
|
if (offset > SPLITMASK) {
|
|
if (++splitnum >= NCACHED) {
|
|
#ifndef macintosh
|
|
(void)write(STDERR_FILENO, OVMSG,
|
|
sizeof(OVMSG) - 1);
|
|
#endif
|
|
return (0);
|
|
}
|
|
hashp->OVFL_POINT = splitnum;
|
|
hashp->SPARES[splitnum] = hashp->SPARES[splitnum-1];
|
|
hashp->SPARES[splitnum-1]--;
|
|
offset = 0;
|
|
}
|
|
} else {
|
|
/*
|
|
* Free_bit addresses the last used bit. Bump it to address
|
|
* the first available bit.
|
|
*/
|
|
free_bit++;
|
|
SETBIT(freep, free_bit);
|
|
}
|
|
|
|
/* Calculate address of the new overflow page */
|
|
addr = OADDR_OF(splitnum, offset);
|
|
#ifdef DEBUG2
|
|
(void)fprintf(stderr, "OVERFLOW_PAGE: ADDR: %d BIT: %d PAGE %d\n",
|
|
addr, free_bit, free_page);
|
|
#endif
|
|
return (addr);
|
|
|
|
found:
|
|
bit = bit + first_free(freep[j]);
|
|
SETBIT(freep, bit);
|
|
#ifdef DEBUG2
|
|
tmp1 = bit;
|
|
tmp2 = i;
|
|
#endif
|
|
/*
|
|
* Bits are addressed starting with 0, but overflow pages are addressed
|
|
* beginning at 1. Bit is a bit addressnumber, so we need to increment
|
|
* it to convert it to a page number.
|
|
*/
|
|
bit = 1 + bit + (i * (hashp->BSIZE << BYTE_SHIFT));
|
|
if (bit >= hashp->LAST_FREED)
|
|
hashp->LAST_FREED = bit - 1;
|
|
|
|
/* Calculate the split number for this page */
|
|
for (i = 0; (i < (unsigned)splitnum) && (bit > hashp->SPARES[i]); i++) {}
|
|
offset = (i ? bit - hashp->SPARES[i - 1] : bit);
|
|
if (offset >= SPLITMASK)
|
|
return (0); /* Out of overflow pages */
|
|
addr = OADDR_OF(i, offset);
|
|
#ifdef DEBUG2
|
|
(void)fprintf(stderr, "OVERFLOW_PAGE: ADDR: %d BIT: %d PAGE %d\n",
|
|
addr, tmp1, tmp2);
|
|
#endif
|
|
|
|
/* Allocate and return the overflow page */
|
|
return (addr);
|
|
}
|
|
|
|
/*
|
|
* Mark this overflow page as free.
|
|
*/
|
|
extern void
|
|
__free_ovflpage(HTAB *hashp, BUFHEAD *obufp)
|
|
{
|
|
uint16 addr;
|
|
uint32 *freep;
|
|
uint32 bit_address, free_page, free_bit;
|
|
uint16 ndx;
|
|
|
|
if(!obufp || !obufp->addr)
|
|
return;
|
|
|
|
addr = obufp->addr;
|
|
#ifdef DEBUG1
|
|
(void)fprintf(stderr, "Freeing %d\n", addr);
|
|
#endif
|
|
ndx = (((uint16)addr) >> SPLITSHIFT);
|
|
bit_address =
|
|
(ndx ? hashp->SPARES[ndx - 1] : 0) + (addr & SPLITMASK) - 1;
|
|
if (bit_address < (uint32)hashp->LAST_FREED)
|
|
hashp->LAST_FREED = bit_address;
|
|
free_page = (bit_address >> (hashp->BSHIFT + BYTE_SHIFT));
|
|
free_bit = bit_address & ((hashp->BSIZE << BYTE_SHIFT) - 1);
|
|
|
|
if (!(freep = hashp->mapp[free_page]))
|
|
freep = fetch_bitmap(hashp, free_page);
|
|
|
|
#ifdef DEBUG
|
|
/*
|
|
* This had better never happen. It means we tried to read a bitmap
|
|
* that has already had overflow pages allocated off it, and we
|
|
* failed to read it from the file.
|
|
*/
|
|
if (!freep)
|
|
{
|
|
assert(0);
|
|
return;
|
|
}
|
|
#endif
|
|
CLRBIT(freep, free_bit);
|
|
#ifdef DEBUG2
|
|
(void)fprintf(stderr, "FREE_OVFLPAGE: ADDR: %d BIT: %d PAGE %d\n",
|
|
obufp->addr, free_bit, free_page);
|
|
#endif
|
|
__reclaim_buf(hashp, obufp);
|
|
}
|
|
|
|
/*
|
|
* Returns:
|
|
* 0 success
|
|
* -1 failure
|
|
*/
|
|
static int
|
|
open_temp(HTAB *hashp)
|
|
{
|
|
#ifdef XP_OS2
|
|
hashp->fp = mkstemp(NULL);
|
|
#else
|
|
#if !defined(_WIN32) && !defined(_WINDOWS) && !defined(macintosh)
|
|
sigset_t set, oset;
|
|
#endif
|
|
#if !defined(macintosh)
|
|
char * tmpdir;
|
|
size_t len;
|
|
char last;
|
|
#endif
|
|
static const char namestr[] = "/_hashXXXXXX";
|
|
char filename[1024];
|
|
|
|
#if !defined(_WIN32) && !defined(_WINDOWS) && !defined(macintosh)
|
|
/* Block signals; make sure file goes away at process exit. */
|
|
(void)sigfillset(&set);
|
|
(void)sigprocmask(SIG_BLOCK, &set, &oset);
|
|
#endif
|
|
|
|
filename[0] = 0;
|
|
#if defined(macintosh)
|
|
strcat(filename, namestr + 1);
|
|
#else
|
|
tmpdir = getenv("TMP");
|
|
if (!tmpdir)
|
|
tmpdir = getenv("TMPDIR");
|
|
if (!tmpdir)
|
|
tmpdir = getenv("TEMP");
|
|
if (!tmpdir)
|
|
tmpdir = ".";
|
|
len = strlen(tmpdir);
|
|
if (len && len < (sizeof filename - sizeof namestr)) {
|
|
strcpy(filename, tmpdir);
|
|
}
|
|
len = strlen(filename);
|
|
last = tmpdir[len - 1];
|
|
strcat(filename, (last == '/' || last == '\\') ? namestr + 1 : namestr);
|
|
#endif
|
|
|
|
#if defined(_WIN32) || defined(_WINDOWS)
|
|
if ((hashp->fp = mkstempflags(filename, _O_BINARY|_O_TEMPORARY)) != -1) {
|
|
if (hashp->filename) {
|
|
free(hashp->filename);
|
|
}
|
|
hashp->filename = strdup(filename);
|
|
hashp->is_temp = 1;
|
|
}
|
|
#else
|
|
if ((hashp->fp = mkstemp(filename)) != -1) {
|
|
(void)unlink(filename);
|
|
#if !defined(macintosh)
|
|
(void)fcntl(hashp->fp, F_SETFD, 1);
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
#if !defined(_WIN32) && !defined(_WINDOWS) && !defined(macintosh)
|
|
(void)sigprocmask(SIG_SETMASK, &oset, (sigset_t *)NULL);
|
|
#endif
|
|
#endif /* !OS2 */
|
|
return (hashp->fp != -1 ? 0 : -1);
|
|
}
|
|
|
|
/*
|
|
* We have to know that the key will fit, but the last entry on the page is
|
|
* an overflow pair, so we need to shift things.
|
|
*/
|
|
static void
|
|
squeeze_key(uint16 *sp, const DBT * key, const DBT * val)
|
|
{
|
|
register char *p;
|
|
uint16 free_space, n, off, pageno;
|
|
|
|
p = (char *)sp;
|
|
n = sp[0];
|
|
free_space = FREESPACE(sp);
|
|
off = OFFSET(sp);
|
|
|
|
pageno = sp[n - 1];
|
|
off -= key->size;
|
|
sp[n - 1] = off;
|
|
memmove(p + off, key->data, key->size);
|
|
off -= val->size;
|
|
sp[n] = off;
|
|
memmove(p + off, val->data, val->size);
|
|
sp[0] = n + 2;
|
|
sp[n + 1] = pageno;
|
|
sp[n + 2] = OVFLPAGE;
|
|
FREESPACE(sp) = free_space - PAIRSIZE(key, val);
|
|
OFFSET(sp) = off;
|
|
}
|
|
|
|
static uint32 *
|
|
fetch_bitmap(HTAB *hashp, uint32 ndx)
|
|
{
|
|
if (ndx >= (unsigned)hashp->nmaps)
|
|
return (NULL);
|
|
if ((hashp->mapp[ndx] = (uint32 *)malloc((size_t)hashp->BSIZE)) == NULL)
|
|
return (NULL);
|
|
if (__get_page(hashp,
|
|
(char *)hashp->mapp[ndx], hashp->BITMAPS[ndx], 0, 1, 1)) {
|
|
free(hashp->mapp[ndx]);
|
|
hashp->mapp[ndx] = NULL; /* NEW: 9-11-95 */
|
|
return (NULL);
|
|
}
|
|
return (hashp->mapp[ndx]);
|
|
}
|
|
|
|
#ifdef DEBUG4
|
|
int
|
|
print_chain(int addr)
|
|
{
|
|
BUFHEAD *bufp;
|
|
short *bp, oaddr;
|
|
|
|
(void)fprintf(stderr, "%d ", addr);
|
|
bufp = __get_buf(hashp, addr, NULL, 0);
|
|
bp = (short *)bufp->page;
|
|
while (bp[0] && ((bp[bp[0]] == OVFLPAGE) ||
|
|
((bp[0] > 2) && bp[2] < REAL_KEY))) {
|
|
oaddr = bp[bp[0] - 1];
|
|
(void)fprintf(stderr, "%d ", (int)oaddr);
|
|
bufp = __get_buf(hashp, (int)oaddr, bufp, 0);
|
|
bp = (short *)bufp->page;
|
|
}
|
|
(void)fprintf(stderr, "\n");
|
|
}
|
|
#endif
|