/* $Id: rstemp.c,v 1.38 2004/08/03 14:54:41 heikki Exp $
Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003
Index Data Aps
This file is part of the Zebra server.
Zebra is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
Zebra is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with Zebra; see the file LICENSE.zebra. If not, write to the
Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.
*/
#include <fcntl.h>
#include <assert.h>
#ifdef WIN32
#include <io.h>
#else
#include <unistd.h>
#endif
#include <string.h>
#include <sys/types.h>
#include <stdio.h>
#include <zebrautl.h>
#include <rstemp.h>
static void *r_create(RSET ct, const struct rset_control *sel, void *parms);
static RSFD r_open (RSET ct, int flag);
static void r_close (RSFD rfd);
static void r_delete (RSET ct);
static void r_rewind (RSFD rfd);
/* static int r_count (RSET ct);*/
static int r_read (RSFD rfd, void *buf, int *term_index);
static int r_write (RSFD rfd, const void *buf);
static const struct rset_control control =
{
"temp",
r_create,
r_open,
r_close,
r_delete,
r_rewind,
rset_default_forward,
rset_default_pos,
r_read,
r_write,
};
const struct rset_control *rset_kind_temp = &control;
struct rset_temp_info {
int fd;
char *fname;
size_t key_size; /* key size */
char *buf_mem; /* window buffer */
size_t buf_size; /* size of window */
size_t pos_end; /* last position in set */
size_t pos_buf; /* position of first byte in window */
size_t pos_border; /* position of last byte+1 in window */
int dirty; /* window is dirty */
int hits; /* no of hits */
char *temp_path;
int (*cmp)(const void *p1, const void *p2);
struct rset_temp_rfd *rfd_list;
};
struct rset_temp_rfd {
struct rset_temp_info *info;
struct rset_temp_rfd *next;
int *countp;
void *buf;
size_t pos_cur; /* current position in set */
};
static void *r_create(RSET ct, const struct rset_control *sel, void *parms)
{
rset_temp_parms *temp_parms = (rset_temp_parms *) parms;
struct rset_temp_info *info;
info = (struct rset_temp_info *) xmalloc (sizeof(struct rset_temp_info));
info->fd = -1;
info->fname = NULL;
info->key_size = temp_parms->key_size;
info->buf_size = 4096;
info->buf_mem = (char *) xmalloc (info->buf_size);
info->pos_end = 0;
info->pos_buf = 0;
info->dirty = 0;
info->hits = -1;
info->cmp = temp_parms->cmp;
info->rfd_list = NULL;
if (!temp_parms->temp_path)
info->temp_path = NULL;
else
{
info->temp_path = (char *) xmalloc (strlen(temp_parms->temp_path)+1);
strcpy (info->temp_path, temp_parms->temp_path);
}
ct->no_rset_terms = 1;
ct->rset_terms = (RSET_TERM *) xmalloc (sizeof(*ct->rset_terms));
ct->rset_terms[0] = temp_parms->rset_term;
return info;
}
static RSFD r_open (RSET ct, int flag)
{
struct rset_temp_info *info = (struct rset_temp_info *) ct->buf;
struct rset_temp_rfd *rfd;
if (info->fd == -1 && info->fname)
{
if (flag & RSETF_WRITE)
info->fd = open (info->fname, O_BINARY|O_RDWR|O_CREAT, 0666);
else
info->fd = open (info->fname, O_BINARY|O_RDONLY);
if (info->fd == -1)
{
logf (LOG_FATAL|LOG_ERRNO, "open %s", info->fname);
exit (1);
}
}
rfd = (struct rset_temp_rfd *) xmalloc (sizeof(*rfd));
rfd->next = info->rfd_list;
info->rfd_list = rfd;
rfd->info = info;
r_rewind (rfd);
rfd->countp = &ct->rset_terms[0]->count;
*rfd->countp = 0;
rfd->buf = xmalloc (info->key_size);
return rfd;
}
/* r_flush:
flush current window to file if file is assocated with set
*/
static void r_flush (RSFD rfd, int mk)
{
struct rset_temp_info *info = ((struct rset_temp_rfd*) rfd)->info;
if (!info->fname && mk)
{
#if HAVE_MKSTEMP
char template[1024];
if (info->temp_path)
sprintf (template, "%s/zrsXXXXXX", info->temp_path);
else
sprintf (template, "zrsXXXXXX");
info->fd = mkstemp (template);
if (info->fd == -1)
{
logf (LOG_FATAL|LOG_ERRNO, "mkstemp %s", template);
exit (1);
}
info->fname = (char *) xmalloc (strlen(template)+1);
strcpy (info->fname, template);
#else
char *s = (char*) tempnam (info->temp_path, "zrs");
info->fname = (char *) xmalloc (strlen(s)+1);
strcpy (info->fname, s);
logf (LOG_DEBUG, "creating tempfile %s", info->fname);
info->fd = open (info->fname, O_BINARY|O_RDWR|O_CREAT, 0666);
if (info->fd == -1)
{
logf (LOG_FATAL|LOG_ERRNO, "open %s", info->fname);
exit (1);
}
#endif
}
if (info->fname && info->fd != -1 && info->dirty)
{
size_t count;
int r;
if (lseek (info->fd, info->pos_buf, SEEK_SET) == -1)
{
logf (LOG_FATAL|LOG_ERRNO, "lseek %s", info->fname);
exit (1);
}
count = info->buf_size;
if (count > info->pos_end - info->pos_buf)
count = info->pos_end - info->pos_buf;
if ((r = write (info->fd, info->buf_mem, count)) < (int) count)
{
if (r == -1)
logf (LOG_FATAL|LOG_ERRNO, "read %s", info->fname);
else
logf (LOG_FATAL, "write of %ld but got %ld",
(long) count, (long) r);
exit (1);
}
info->dirty = 0;
}
}
static void r_close (RSFD rfd)
{
struct rset_temp_info *info = ((struct rset_temp_rfd*)rfd)->info;
struct rset_temp_rfd **rfdp;
for (rfdp = &info->rfd_list; *rfdp; rfdp = &(*rfdp)->next)
if (*rfdp == rfd)
{
r_flush (*rfdp, 0);
xfree ((*rfdp)->buf);
*rfdp = (*rfdp)->next;
xfree (rfd);
if (!info->rfd_list && info->fname && info->fd != -1)
{
close (info->fd);
info->fd = -1;
}
return;
}
logf (LOG_FATAL, "r_close but no rfd match!");
assert (0);
}
static void r_delete (RSET ct)
{
struct rset_temp_info *info = (struct rset_temp_info*) ct->buf;
if (info->fname)
unlink (info->fname);
xfree (info->buf_mem);
logf (LOG_DEBUG, "r_delete: set size %ld", (long) info->pos_end);
if (info->fname)
{
logf (LOG_DEBUG, "r_delete: unlink %s", info->fname);
unlink (info->fname);
xfree (info->fname);
}
if (info->temp_path)
xfree (info->temp_path);
rset_term_destroy (ct->rset_terms[0]);
xfree (ct->rset_terms);
xfree (info);
}
/* r_reread:
read from file to window if file is assocated with set -
indicated by fname
*/
static void r_reread (RSFD rfd)
{
struct rset_temp_info *info = ((struct rset_temp_rfd*)rfd)->info;
if (info->fname)
{
size_t count;
int r;
info->pos_border = ((struct rset_temp_rfd *)rfd)->pos_cur +
info->buf_size;
if (info->pos_border > info->pos_end)
info->pos_border = info->pos_end;
count = info->pos_border - info->pos_buf;
if (count > 0)
{
if (lseek (info->fd, info->pos_buf, SEEK_SET) == -1)
{
logf (LOG_FATAL|LOG_ERRNO, "lseek %s", info->fname);
exit (1);
}
if ((r = read (info->fd, info->buf_mem, count)) < (int) count)
{
if (r == -1)
logf (LOG_FATAL|LOG_ERRNO, "read %s", info->fname);
else
logf (LOG_FATAL, "read of %ld but got %ld",
(long) count, (long) r);
exit (1);
}
}
}
else
info->pos_border = info->pos_end;
}
static void r_rewind (RSFD rfd)
{
struct rset_temp_info *info = ((struct rset_temp_rfd*)rfd)->info;
r_flush (rfd, 0);
((struct rset_temp_rfd *)rfd)->pos_cur = 0;
info->pos_buf = 0;
r_reread (rfd);
}
/*
static int r_count (RSET ct)
{
struct rset_temp_info *info = (struct rset_temp_info *) ct->buf;
return info->pos_end / info->key_size;
}
*/
static int r_read (RSFD rfd, void *buf, int *term_index)
{
struct rset_temp_rfd *mrfd = (struct rset_temp_rfd*) rfd;
struct rset_temp_info *info = mrfd->info;
size_t nc = mrfd->pos_cur + info->key_size;
if (mrfd->pos_cur < info->pos_buf || nc > info->pos_border)
{
if (nc > info->pos_end)
return 0;
r_flush (rfd, 0);
info->pos_buf = mrfd->pos_cur;
r_reread (rfd);
}
memcpy (buf, info->buf_mem + (mrfd->pos_cur - info->pos_buf),
info->key_size);
mrfd->pos_cur = nc;
*term_index = 0;
if (*mrfd->countp == 0 || (*info->cmp)(buf, mrfd->buf) > 1)
{
memcpy (mrfd->buf, buf, mrfd->info->key_size);
(*mrfd->countp)++;
}
return 1;
}
static int r_write (RSFD rfd, const void *buf)
{
struct rset_temp_rfd *mrfd = (struct rset_temp_rfd*) rfd;
struct rset_temp_info *info = mrfd->info;
size_t nc = mrfd->pos_cur + info->key_size;
if (nc > info->pos_buf + info->buf_size)
{
r_flush (rfd, 1);
info->pos_buf = mrfd->pos_cur;
if (info->pos_buf < info->pos_end)
r_reread (rfd);
}
info->dirty = 1;
memcpy (info->buf_mem + (mrfd->pos_cur - info->pos_buf), buf,
info->key_size);
mrfd->pos_cur = nc;
if (nc > info->pos_end)
info->pos_border = info->pos_end = nc;
return 1;
}
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