diff options
author | Ulrich Drepper <drepper@redhat.com> | 1997-08-27 20:26:10 +0000 |
---|---|---|
committer | Ulrich Drepper <drepper@redhat.com> | 1997-08-27 20:26:10 +0000 |
commit | 92f1da4da04a7a86ddee91be5eaf0b10c333ac64 (patch) | |
tree | 2a10ce9e4e407e7e5b5ca092ca0947d234b5ff60 /db2/db/db_overflow.c | |
parent | 22be878ecbc66606371bd33258f56e6711e6ba7a (diff) | |
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Update.cvs/libc-ud-970827
1997-08-10 19:17 Philip Blundell <Philip.Blundell@pobox.com>
* nss/nss_db/db-XXX.c: Include <db_185.h> not <db.h>. Somebody
should update this to use the new db API.
* nss/nss_db/db-netgrp.c: Likewise.
* nss/nss_db/db-alias.c: Likewise.
* db2/Makefile: Makefile for db-2.x in glibc.
1997-08-27 21:20 Ulrich Drepper <drepper@cygnus.com>
* csu/Makefile (before-compile): New goal. Make sure abi-tag.h
is generated.
[$(elf)=yes] (asm-CPPFLAGS): Make sure abi-tag.h file can be found.
* Makeconfig [$(build-omitfp)=yes] (CFLAGS-.o): Add
-D__USE_STRING_INLINES.
* string/string.f: Move strnlen optimization after inclusion of
<bits/string.h>. Include <bits/string.h> only if __USE_STRING_INLINES
is defined.
* sysdeps/generic/memcpy.c: Undef memcpy to allow macro of this name
in <bits/string.h>.
* sysdeps/generic/memset.c: Likewise.
* sysdeps/i386/string.h: i386 optimized string functions.
* sysdeps/i386/i486string.h: i486+ optimized string functions.
* Makefile (subdirs): Change db to db2.
* shlib-versions: Bump libdb verion number to 3.
* include/db.h: Include from db2 directory.
* include/db_185.h: New file.
* sysdeps/i386/Makefile [$(subdirs)=db2] (CPPFLAGS): Add macros
to provide spinlock information for db2.
* sysdeps/m68k/m68020/Makefile: New file. Likewise.
* sysdeps/sparc/Makefile: New file. Likewise.
* sysdeps/unix/sysv/linux/Makefile [$(subdirs)=db2] (CPPFLAGS):
Add -DHAVE_LLSEEK.
* db2/config.h: Hand-edited config file for db2 in glibc.
* db2/compat.h: New file from db-2.3.4.
* db2/db.h: Likewise.
* db2/db_185.h: Likewise.
* db2/db_int.h: Likewise.
* db2/makedb.c: Likewise.
* db2/btree/bt_close.c: Likewise.
* db2/btree/bt_compare.c: Likewise.
* db2/btree/bt_conv.c: Likewise.
* db2/btree/bt_cursor.c: Likewise.
* db2/btree/bt_delete.c: Likewise.
* db2/btree/bt_open.c: Likewise.
* db2/btree/bt_page.c: Likewise.
* db2/btree/bt_put.c: Likewise.
* db2/btree/bt_rec.c: Likewise.
* db2/btree/bt_recno.c: Likewise.
* db2/btree/btree_auto.c: Likewise.
* db2/btree/bt_rsearch.c: Likewise.
* db2/btree/bt_search.c: Likewise.
* db2/btree/bt_split.c: Likewise.
* db2/btree/bt_stat.c: Likewise.
* db2/btree/btree.src: Likewise.
* db2/common/db_appinit.c: Likewise.
* db2/common/db_err.c: Likewise.
* db2/common/db_byteorder.c: Likewise.
* db2/common/db_apprec.c: Likewise.
* db2/common/db_salloc.c: Likewise.
* db2/common/db_log2.c: Likewise.
* db2/common/db_region.c: Likewise.
* db2/common/db_shash.c: Likewise.
* db2/db/db.c: Likewise.
* db2/db/db.src: Likewise.
* db2/db/db_conv.c: Likewise.
* db2/db/db_dispatch.c: Likewise.
* db2/db/db_dup.c: Likewise.
* db2/db/db_overflow.c: Likewise.
* db2/db/db_pr.c: Likewise.
* db2/db/db_rec.c: Likewise.
* db2/db/db_ret.c: Likewise.
* db2/db/db_thread.c: Likewise.
* db2/db/db_auto.c: Likewise.
* db2/db185/db185.c: Likewise.
* db2/db185/db185_int.h: Likewise.
* db2/dbm/dbm.c: Likewise.
* db2/hash/hash.c: Likewise.
* db2/hash/hash.src: Likewise.
* db2/hash/hash_page.c: Likewise.
* db2/hash/hash_conv.c: Likewise.
* db2/hash/hash_debug.c: Likewise.
* db2/hash/hash_stat.c: Likewise.
* db2/hash/hash_rec.c: Likewise.
* db2/hash/hash_dup.c: Likewise.
* db2/hash/hash_func.c: Likewise.
* db2/hash/hash_auto.c: Likewise.
* db2/include/mp.h: Likewise.
* db2/include/btree.h: Likewise.
* db2/include/db.h.src: Likewise.
* db2/include/db_int.h.src: Likewise.
* db2/include/db_shash.h: Likewise.
* db2/include/db_swap.h: Likewise.
* db2/include/db_185.h.src: Likewise.
* db2/include/txn.h: Likewise.
* db2/include/db_am.h: Likewise.
* db2/include/shqueue.h: Likewise.
* db2/include/hash.h: Likewise.
* db2/include/db_dispatch.h: Likewise.
* db2/include/lock.h: Likewise.
* db2/include/db_page.h: Likewise.
* db2/include/log.h: Likewise.
* db2/include/db_auto.h: Likewise.
* db2/include/btree_auto.h: Likewise.
* db2/include/hash_auto.h: Likewise.
* db2/include/log_auto.h: Likewise.
* db2/include/txn_auto.h: Likewise.
* db2/include/db_ext.h: Likewise.
* db2/include/btree_ext.h: Likewise.
* db2/include/clib_ext.h: Likewise.
* db2/include/common_ext.h: Likewise.
* db2/include/hash_ext.h: Likewise.
* db2/include/lock_ext.h: Likewise.
* db2/include/log_ext.h: Likewise.
* db2/include/mp_ext.h: Likewise.
* db2/include/mutex_ext.h: Likewise.
* db2/include/os_ext.h: Likewise.
* db2/include/txn_ext.h: Likewise.
* db2/include/cxx_int.h: Likewise.
* db2/include/db_cxx.h: Likewise.
* db2/include/queue.h: Likewise.
* db2/lock/lock.c: Likewise.
* db2/lock/lock_conflict.c: Likewise.
* db2/lock/lock_util.c: Likewise.
* db2/lock/lock_deadlock.c: Likewise.
* db2/log/log.c: Likewise.
* db2/log/log_get.c: Likewise.
* db2/log/log.src: Likewise.
* db2/log/log_compare.c: Likewise.
* db2/log/log_put.c: Likewise.
* db2/log/log_rec.c: Likewise.
* db2/log/log_archive.c: Likewise.
* db2/log/log_register.c: Likewise.
* db2/log/log_auto.c: Likewise.
* db2/log/log_findckp.c: Likewise.
* db2/mp/mp_bh.c: Likewise.
* db2/mp/mp_fget.c: Likewise.
* db2/mp/mp_fopen.c: Likewise.
* db2/mp/mp_fput.c: Likewise.
* db2/mp/mp_fset.c: Likewise.
* db2/mp/mp_open.c: Likewise.
* db2/mp/mp_region.c: Likewise.
* db2/mp/mp_pr.c: Likewise.
* db2/mp/mp_sync.c: Likewise.
* db2/mutex/68020.gcc: Likewise.
* db2/mutex/mutex.c: Likewise.
* db2/mutex/README: Likewise.
* db2/mutex/x86.gcc: Likewise.
* db2/mutex/sparc.gcc: Likewise.
* db2/mutex/uts4.cc.s: Likewise.
* db2/mutex/alpha.dec: Likewise.
* db2/mutex/alpha.gcc: Likewise.
* db2/mutex/parisc.gcc: Likewise.
* db2/mutex/parisc.hp: Likewise.
* db2/os/db_os_abs.c: Likewise.
* db2/os/db_os_dir.c: Likewise.
* db2/os/db_os_fid.c: Likewise.
* db2/os/db_os_lseek.c: Likewise.
* db2/os/db_os_mmap.c: Likewise.
* db2/os/db_os_open.c: Likewise.
* db2/os/db_os_rw.c: Likewise.
* db2/os/db_os_sleep.c: Likewise.
* db2/os/db_os_stat.c: Likewise.
* db2/os/db_os_unlink.c: Likewise.
* db2/txn/txn.c: Likewise.
* db2/txn/txn.src: Likewise.
* db2/txn/txn_rec.c: Likewise.
* db2/txn/txn_auto.c: Likewise.
* db2/clib/getlong.c: Likewise.
* db2/progs/db_archive/db_archive.c: Likewise.
* db2/progs/db_checkpoint/db_checkpoint.c: Likewise.
* db2/progs/db_deadlock/db_deadlock.c: Likewise.
* db2/progs/db_dump/db_dump.c: Likewise.
* db2/progs/db_dump185/db_dump185.c: Likewise.
* db2/progs/db_load/db_load.c: Likewise.
* db2/progs/db_printlog/db_printlog.c: Likewise.
* db2/progs/db_recover/db_recover.c: Likewise.
* db2/progs/db_stat/db_stat.c: Likewise.
* libio/stdio.h [__cplusplus] (__STDIO_INLINE): Define as inline.
* po/de.po, po/sv.po: Update from 2.0.5 translations.
* sysdeps/unix/sysv/linux/netinet/tcp.h: Pretty print.
* sunrpc/rpc/xdr.h (XDR): Don't define argument of x_destroy callback
as const.
* sunrpc/xdr_mem.c (xdrmem_destroy): Don't define argument as const.
* sunrpx/xdr_rec.c (xdrrec_destroy): Likewise.
* sunrpx/xdr_stdio.c (xdrstdio_destroy): Likewise.
1997-08-27 18:47 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/unix/sysv/linux/if_index.c: Include <errno.h>.
Reported by Benjamin Kosnik <bkoz@cygnus.com>.
1997-08-27 02:27 Roland McGrath <roland@baalperazim.frob.com>
* abi-tags: New file.
* csu/Makefile (distribute): Remove abi-tag.h.
($(objpfx)abi-tag.h): New target.
* Makefile (distribute): Add abi-tags.
* sysdeps/unix/sysv/linux/abi-tag.h: File removed.
* sysdeps/mach/hurd/abi-tag.h: File removed.
* sysdeps/stub/abi-tag.h: File removed.
1997-08-25 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* sysdeps/unix/make-syscalls.sh: Change output so that it
generates compilation rules only for the currently selected object
suffixes.
1997-08-25 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* sysdeps/m68k/dl-machine.h (RTLD_START): Switch back to previous
section to avoid confusing the compiler.
* sysdeps/alpha/dl-machine.h (RTLD_START): Likewise.
* sysdeps/i386/dl-machine.h (RTLD_START): Likewise.
* sysdeps/mips/dl-machine.h (RTLD_START): Likewise.
* sysdeps/mips/mips64/dl-machine.h (RTLD_START): Likewise.
* sysdeps/sparc/sparc32/dl-machine.h (RTLD_START): Likewise.
* sysdeps/m68k/dl-machine.h (elf_machine_load_address): Use a GOT
relocation instead of a constant to avoid text relocation.
(ELF_MACHINE_BEFORE_RTLD_RELOC): Removed.
(RTLD_START): Declare global labels as functions and add size
directive.
1997-08-25 17:01 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/i386/bits/select.h: Correct assembler versions to work even
for descriptors >= 32.
* stdlib/alloca.h: Don't define alloca to __alloca since if gcc
is used __alloca is not defined to __builtin_alloca and so might
not be available.
Reported by Uwe Ohse <uwe@ohse.de>.
* sysdeps/unix/sysv/linux/sys/sysmacros.h: Define macros in a special
way if gcc is not used and so dev_t is an array.
Reported by Uwe Ohse <uwe@ohse.de>.
1997-08-23 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* manual/libc.texinfo: Reorder chapters to match logical order.
1997-08-25 12:22 Ulrich Drepper <drepper@cygnus.com>
* sunrpc/rpc/xdr.h: Change name of parameters in prototypes of
xdr_reference, xdrmem_create, and xdrstdio_create because of clash
with g++ internal symbols.
Patch by Sudish Joseph <sj@eng.mindspring.net>.
* elf/dl-deps.c: Implement handling of DT_FILTER.
Diffstat (limited to 'db2/db/db_overflow.c')
-rw-r--r-- | db2/db/db_overflow.c | 383 |
1 files changed, 383 insertions, 0 deletions
diff --git a/db2/db/db_overflow.c b/db2/db/db_overflow.c new file mode 100644 index 0000000000..2340e9e358 --- /dev/null +++ b/db2/db/db_overflow.c @@ -0,0 +1,383 @@ +/*- + * See the file LICENSE for redistribution information. + * + * Copyright (c) 1996, 1997 + * Sleepycat Software. All rights reserved. + */ +/* + * Copyright (c) 1990, 1993, 1994, 1995, 1996 + * Keith Bostic. All rights reserved. + */ +/* + * Copyright (c) 1990, 1993, 1994, 1995 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Mike Olson. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "config.h" + +#ifndef lint +static const char sccsid[] = "@(#)db_overflow.c 10.4 (Sleepycat) 7/2/97"; +#endif /* not lint */ + +#ifndef NO_SYSTEM_INCLUDES +#include <sys/types.h> + +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#endif + +#include "db_int.h" +#include "db_page.h" +#include "db_am.h" +#include "common_ext.h" + +/* + * Big key/data code. + * + * Big key and data entries are stored on linked lists of pages. The initial + * reference is a structure with the total length of the item and the page + * number where it begins. Each entry in the linked list contains a pointer + * to the next page of data, and so on. + */ + +/* + * __db_goff -- + * Get an offpage item. + * + * PUBLIC: int __db_goff __P((DB *, DBT *, + * PUBLIC: u_int32_t, db_pgno_t, void **, u_int32_t *)); + */ +int +__db_goff(dbp, dbt, tlen, pgno, bpp, bpsz) + DB *dbp; + DBT *dbt; + u_int32_t tlen; + db_pgno_t pgno; + void **bpp; + u_int32_t *bpsz; +{ + PAGE *h; + db_indx_t bytes; + int ret; + u_int32_t curoff, needed, start; + u_int8_t *p, *src; + + /* + * Check if the buffer is big enough; if it is not and we are + * allowed to malloc space, then we'll malloc it. If we are + * not (DB_DBT_USERMEM), then we'll set the dbt and return + * appropriately. + */ + if (F_ISSET(dbt, DB_DBT_PARTIAL)) { + start = dbt->doff; + needed = dbt->dlen; + } else { + start = 0; + needed = tlen; + } + + /* + * Allocate any necessary memory. + * + * XXX: Never allocate 0 bytes; + */ + if (F_ISSET(dbt, DB_DBT_USERMEM)) { + if (needed > dbt->ulen) { + dbt->size = needed; + return (ENOMEM); + } + } else if (F_ISSET(dbt, DB_DBT_MALLOC)) { + dbt->data = dbp->db_malloc == NULL ? + (void *)malloc(needed + 1) : + (void *)dbp->db_malloc(needed + 1); + if (dbt->data == NULL) + return (ENOMEM); + } else if (*bpsz == 0 || *bpsz < needed) { + *bpp = (*bpp == NULL ? + (void *)malloc(needed + 1) : + (void *)realloc(*bpp, needed + 1)); + if (*bpp == NULL) + return (ENOMEM); + *bpsz = needed + 1; + dbt->data = *bpp; + } else + dbt->data = *bpp; + + /* + * Step through the linked list of pages, copying the data on each + * one into the buffer. Never copy more than the total data length. + */ + dbt->size = needed; + for (curoff = 0, p = dbt->data; pgno != P_INVALID && needed > 0;) { + if ((ret = memp_fget(dbp->mpf, &pgno, 0, &h)) != 0) { + (void)__db_pgerr(dbp, pgno); + return (ret); + } + /* Check if we need any bytes from this page. */ + if (curoff + OV_LEN(h) >= start) { + src = (u_int8_t *)h + P_OVERHEAD; + bytes = OV_LEN(h); + if (start > curoff) { + src += start - curoff; + bytes -= start - curoff; + } + if (bytes > needed) + bytes = needed; + memcpy(p, src, bytes); + p += bytes; + needed -= bytes; + } + curoff += OV_LEN(h); + pgno = h->next_pgno; + memp_fput(dbp->mpf, h, 0); + } + return (0); +} + +/* + * __db_poff -- + * Put an offpage item. + * + * PUBLIC: int __db_poff __P((DB *, const DBT *, db_pgno_t *, + * PUBLIC: int (*)(DB *, u_int32_t, PAGE **))); + */ +int +__db_poff(dbp, dbt, pgnop, newfunc) + DB *dbp; + const DBT *dbt; + db_pgno_t *pgnop; + int (*newfunc) __P((DB *, u_int32_t, PAGE **)); +{ + PAGE *pagep, *lastp; + DB_LSN new_lsn, null_lsn; + DBT tmp_dbt; + db_indx_t pagespace; + u_int32_t sz; + u_int8_t *p; + int ret; + + /* + * Allocate pages and copy the key/data item into them. Calculate the + * number of bytes we get for pages we fill completely with a single + * item. + */ + pagespace = P_MAXSPACE(dbp->pgsize); + + lastp = NULL; + for (p = dbt->data, + sz = dbt->size; sz > 0; p += pagespace, sz -= pagespace) { + /* + * Reduce pagespace so we terminate the loop correctly and + * don't copy too much data. + */ + if (sz < pagespace) + pagespace = sz; + + /* + * Allocate and initialize a new page and copy all or part of + * the item onto the page. If sz is less than pagespace, we + * have a partial record. + */ + if ((ret = newfunc(dbp, P_OVERFLOW, &pagep)) != 0) + return (ret); + if (DB_LOGGING(dbp)) { + tmp_dbt.data = p; + tmp_dbt.size = pagespace; + ZERO_LSN(null_lsn); + if ((ret = __db_big_log(dbp->dbenv->lg_info, dbp->txn, + &new_lsn, 0, DB_ADD_BIG, dbp->log_fileid, + PGNO(pagep), lastp ? PGNO(lastp) : PGNO_INVALID, + PGNO_INVALID, &tmp_dbt, &LSN(pagep), + lastp == NULL ? &null_lsn : &LSN(lastp), + &null_lsn)) != 0) + return (ret); + + /* Move lsn onto page. */ + if (lastp) + LSN(lastp) = new_lsn; + LSN(pagep) = new_lsn; + } + + P_INIT(pagep, dbp->pgsize, + PGNO(pagep), PGNO_INVALID, PGNO_INVALID, 0, P_OVERFLOW); + OV_LEN(pagep) = pagespace; + OV_REF(pagep) = 1; + memcpy((u_int8_t *)pagep + P_OVERHEAD, p, pagespace); + + /* + * If this is the first entry, update the user's info. + * Otherwise, update the entry on the last page filled + * in and release that page. + */ + if (lastp == NULL) + *pgnop = PGNO(pagep); + else { + lastp->next_pgno = PGNO(pagep); + pagep->prev_pgno = PGNO(lastp); + (void)memp_fput(dbp->mpf, lastp, DB_MPOOL_DIRTY); + } + lastp = pagep; + } + (void)memp_fput(dbp->mpf, lastp, DB_MPOOL_DIRTY); + return (0); +} + +/* + * __db_ioff -- + * Increment the reference count on an overflow page. + * + * PUBLIC: int __db_ioff __P((DB *, db_pgno_t)); + */ +int +__db_ioff(dbp, pgno) + DB *dbp; + db_pgno_t pgno; +{ + PAGE *h; + int ret; + + if ((ret = memp_fget(dbp->mpf, &pgno, 0, &h)) != 0) { + (void)__db_pgerr(dbp, pgno); + return (ret); + } + + ++OV_REF(h); + if (DB_LOGGING(dbp) && (ret = __db_ovref_log(dbp->dbenv->lg_info, + dbp->txn, &LSN(h), 0, dbp->log_fileid, h->pgno, &LSN(h))) != 0) + return (ret); + + (void)memp_fput(dbp->mpf, h, DB_MPOOL_DIRTY); + return (0); +} + +/* + * __db_doff -- + * Delete an offpage chain of overflow pages. + * + * PUBLIC: int __db_doff __P((DB *, db_pgno_t, int (*)(DB *, PAGE *))); + */ +int +__db_doff(dbp, pgno, freefunc) + DB *dbp; + db_pgno_t pgno; + int (*freefunc) __P((DB *, PAGE *)); +{ + PAGE *pagep; + DB_LSN null_lsn; + DBT tmp_dbt; + int ret; + + do { + if ((ret = memp_fget(dbp->mpf, &pgno, 0, &pagep)) != 0) { + (void)__db_pgerr(dbp, pgno); + return (ret); + } + + /* + * If it's an overflow page and it's referenced by more than + * one key/data item, decrement the reference count and return. + */ + if (TYPE(pagep) == P_OVERFLOW && OV_REF(pagep) > 1) { + --OV_REF(pagep); + (void)memp_fput(dbp->mpf, pagep, DB_MPOOL_DIRTY); + return (0); + } + + if (DB_LOGGING(dbp)) { + tmp_dbt.data = (u_int8_t *)pagep + P_OVERHEAD; + tmp_dbt.size = OV_LEN(pagep); + ZERO_LSN(null_lsn); + if ((ret = __db_big_log(dbp->dbenv->lg_info, dbp->txn, + &LSN(pagep), 0, DB_REM_BIG, dbp->log_fileid, + PGNO(pagep), PREV_PGNO(pagep), NEXT_PGNO(pagep), + &tmp_dbt, &LSN(pagep), &null_lsn, &null_lsn)) != 0) + return (ret); + } + pgno = pagep->next_pgno; + if ((ret = freefunc(dbp, pagep)) != 0) + return (ret); + } while (pgno != PGNO_INVALID); + + return (0); +} + +/* + * __db_moff -- + * Match on overflow pages. + * + * Given a starting page number and a key, return <0, 0, >0 to indicate if the + * key on the page is less than, equal to or greater than the key specified. + * + * PUBLIC: int __db_moff __P((DB *, const DBT *, db_pgno_t)); + */ +int +__db_moff(dbp, dbt, pgno) + DB *dbp; + const DBT *dbt; + db_pgno_t pgno; +{ + PAGE *pagep; + u_int32_t cmp_bytes, key_left; + int ret; + u_int8_t *p1, *p2; + + /* While there are both keys to compare. */ + for (ret = 0, p1 = dbt->data, + key_left = dbt->size; key_left > 0 && pgno != PGNO_INVALID;) { + if (memp_fget(dbp->mpf, &pgno, 0, &pagep) != 0) { + (void)__db_pgerr(dbp, pgno); + return (0); /* No system error return. */ + } + + cmp_bytes = OV_LEN(pagep) < key_left ? OV_LEN(pagep) : key_left; + key_left -= cmp_bytes; + for (p2 = + (u_int8_t *)pagep + P_OVERHEAD; cmp_bytes-- > 0; ++p1, ++p2) + if (*p1 != *p2) { + ret = (long)*p1 - (long)*p2; + break; + } + pgno = NEXT_PGNO(pagep); + (void)memp_fput(dbp->mpf, pagep, 0); + if (ret != 0) + return (ret); + } + if (key_left > 0) /* DBT is longer than page key. */ + return (-1); + if (pgno != PGNO_INVALID) /* DBT is shorter than page key. */ + return (1); + return (0); +} |