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Viewing changes to libdb/os/os_seek.c

  • Committer: Bazaar Package Importer
  • Author(s): Didier Roche
  • Date: 2010-05-17 17:02:06 UTC
  • mfrom: (1.1.79 upstream) (1.6.12 experimental)
  • Revision ID: james.westby@ubuntu.com-20100517170206-4ufr52vwrhh26yh0
Tags: 2.30.1-1ubuntu1
https://launchpad.net/bugs/42199
https://launchpad.net/bugs/229669
https://launchpad.net/bugs/173703
https://launchpad.net/bugs/360344
https://launchpad.net/bugs/508494
* Merge from debian experimental. Remaining change:
  (LP: #42199, #229669, #173703, #360344, #508494)
  + debian/control:
    - add Vcs-Bzr tag
    - don't use libgnome
    - Use Breaks instead of Conflicts against evolution 2.25 and earlier.
  + debian/evolution-data-server.install,
    debian/patches/45_libcamel_providers_version.patch:
    - use the upstream versioning, not a Debian-specific one 
  + debian/libedata-book1.2-dev.install, debian/libebackend-1.2-dev.install,
    debian/libcamel1.2-dev.install, debian/libedataserverui1.2-dev.install:
    - install html documentation
  + debian/rules:
    - don't build documentation it's shipped with the tarball

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libdb/os/os_seek.c
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/*-
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 * See the file LICENSE for redistribution information.
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 *
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 * Copyright (c) 1997-2002
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 *      Sleepycat Software.  All rights reserved.
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 */
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#include "db_config.h"
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#ifndef lint
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static const char revid[] = "$Id$";
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#endif /* not lint */
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#endif
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#include "db_int.h"
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/*
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 * __os_seek --
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 *      Seek to a page/byte offset in the file.
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 *
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 * PUBLIC: int __os_seek __P((DB_ENV *,
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 * PUBLIC:      DB_FH *, size_t, db_pgno_t, u_int32_t, int, DB_OS_SEEK));
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 */
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int
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__os_seek(dbenv, fhp, pgsize, pageno, relative, isrewind, db_whence)
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        DB_ENV *dbenv;
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        DB_FH *fhp;
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        size_t pgsize;
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        db_pgno_t pageno;
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        u_int32_t relative;
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        int isrewind;
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        DB_OS_SEEK db_whence;
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{
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        off_t offset;
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        int ret, whence;
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        switch (db_whence) {
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        case DB_OS_SEEK_CUR:
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                whence = SEEK_CUR;
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                break;
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        case DB_OS_SEEK_END:
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                whence = SEEK_END;
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                break;
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        case DB_OS_SEEK_SET:
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                whence = SEEK_SET;
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                break;
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        default:
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                return (EINVAL);
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        }
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        if (DB_GLOBAL(j_seek) != NULL)
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                ret = DB_GLOBAL(j_seek)(fhp->fd,
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                    pgsize, pageno, relative, isrewind, whence);
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        else {
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                offset = (off_t)pgsize * pageno + relative;
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                if (isrewind)
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                        offset = -offset;
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                do {
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                        ret = lseek(fhp->fd, offset, whence) == -1 ?
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                            __os_get_errno() : 0;
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                } while (ret == EINTR);
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        }
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        if (ret == 0) {
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                fhp->pgsize = pgsize;
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                fhp->pgno = pageno;
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                fhp->offset = relative;
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        } else
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                __db_err(dbenv, "seek: %lu %d %d: %s",
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                    (u_long)pgsize * pageno + relative,
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                    isrewind, db_whence, strerror(ret));
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        return (ret);
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}