1 /* $Id: rstemp.c,v 1.42 2004-08-06 12:55:03 adam Exp $
2 Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003
5 This file is part of the Zebra server.
7 Zebra is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 Zebra is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with Zebra; see the file LICENSE.zebra. If not, write to the
19 Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
31 #include <sys/types.h>
37 static void *r_create(RSET ct, const struct rset_control *sel, void *parms);
38 static RSFD r_open (RSET ct, int flag);
39 static void r_close (RSFD rfd);
40 static void r_delete (RSET ct);
41 static void r_rewind (RSFD rfd);
42 /* static int r_count (RSET ct);*/
43 static int r_read (RSFD rfd, void *buf, int *term_index);
44 static int r_write (RSFD rfd, const void *buf);
45 static void r_pos (RSFD rfd, double *current, double *total);
47 static const struct rset_control control =
61 const struct rset_control *rset_kind_temp = &control;
63 struct rset_temp_info {
66 size_t key_size; /* key size */
67 char *buf_mem; /* window buffer */
68 size_t buf_size; /* size of window */
69 size_t pos_end; /* last position in set */
70 size_t pos_buf; /* position of first byte in window */
71 size_t pos_border; /* position of last byte+1 in window */
72 int dirty; /* window is dirty */
73 zint hits; /* no of hits */
75 int (*cmp)(const void *p1, const void *p2);
76 struct rset_temp_rfd *rfd_list;
79 struct rset_temp_rfd {
80 struct rset_temp_info *info;
81 struct rset_temp_rfd *next;
84 size_t pos_cur; /* current position in set */
85 zint cur; /* number of the current hit */
88 static void *r_create(RSET ct, const struct rset_control *sel, void *parms)
90 rset_temp_parms *temp_parms = (rset_temp_parms *) parms;
91 struct rset_temp_info *info;
93 info = (struct rset_temp_info *) xmalloc (sizeof(struct rset_temp_info));
96 info->key_size = temp_parms->key_size;
97 info->buf_size = 4096;
98 info->buf_mem = (char *) xmalloc (info->buf_size);
103 info->cmp = temp_parms->cmp;
104 info->rfd_list = NULL;
106 if (!temp_parms->temp_path)
107 info->temp_path = NULL;
110 info->temp_path = (char *) xmalloc (strlen(temp_parms->temp_path)+1);
111 strcpy (info->temp_path, temp_parms->temp_path);
113 ct->no_rset_terms = 1;
114 ct->rset_terms = (RSET_TERM *) xmalloc (sizeof(*ct->rset_terms));
115 ct->rset_terms[0] = temp_parms->rset_term;
120 static RSFD r_open (RSET ct, int flag)
122 struct rset_temp_info *info = (struct rset_temp_info *) ct->buf;
123 struct rset_temp_rfd *rfd;
125 if (info->fd == -1 && info->fname)
127 if (flag & RSETF_WRITE)
128 info->fd = open (info->fname, O_BINARY|O_RDWR|O_CREAT, 0666);
130 info->fd = open (info->fname, O_BINARY|O_RDONLY);
133 logf (LOG_FATAL|LOG_ERRNO, "open %s", info->fname);
137 rfd = (struct rset_temp_rfd *) xmalloc (sizeof(*rfd));
138 rfd->next = info->rfd_list;
139 info->rfd_list = rfd;
143 rfd->countp = &ct->rset_terms[0]->count;
145 rfd->buf = xmalloc (info->key_size);
151 flush current window to file if file is assocated with set
153 static void r_flush (RSFD rfd, int mk)
155 struct rset_temp_info *info = ((struct rset_temp_rfd*) rfd)->info;
157 if (!info->fname && mk)
163 sprintf (template, "%s/zrsXXXXXX", info->temp_path);
165 sprintf (template, "zrsXXXXXX");
167 info->fd = mkstemp (template);
171 logf (LOG_FATAL|LOG_ERRNO, "mkstemp %s", template);
174 info->fname = (char *) xmalloc (strlen(template)+1);
175 strcpy (info->fname, template);
177 char *s = (char*) tempnam (info->temp_path, "zrs");
178 info->fname = (char *) xmalloc (strlen(s)+1);
179 strcpy (info->fname, s);
181 logf (LOG_DEBUG, "creating tempfile %s", info->fname);
182 info->fd = open (info->fname, O_BINARY|O_RDWR|O_CREAT, 0666);
185 logf (LOG_FATAL|LOG_ERRNO, "open %s", info->fname);
190 if (info->fname && info->fd != -1 && info->dirty)
195 if (lseek (info->fd, info->pos_buf, SEEK_SET) == -1)
197 logf (LOG_FATAL|LOG_ERRNO, "lseek %s", info->fname);
200 count = info->buf_size;
201 if (count > info->pos_end - info->pos_buf)
202 count = info->pos_end - info->pos_buf;
203 if ((r = write (info->fd, info->buf_mem, count)) < (int) count)
206 logf (LOG_FATAL|LOG_ERRNO, "read %s", info->fname);
208 logf (LOG_FATAL, "write of %ld but got %ld",
209 (long) count, (long) r);
216 static void r_close (RSFD rfd)
218 struct rset_temp_info *info = ((struct rset_temp_rfd*)rfd)->info;
219 struct rset_temp_rfd **rfdp;
221 for (rfdp = &info->rfd_list; *rfdp; rfdp = &(*rfdp)->next)
225 xfree ((*rfdp)->buf);
227 *rfdp = (*rfdp)->next;
230 if (!info->rfd_list && info->fname && info->fd != -1)
237 logf (LOG_FATAL, "r_close but no rfd match!");
241 static void r_delete (RSET ct)
243 struct rset_temp_info *info = (struct rset_temp_info*) ct->buf;
246 unlink (info->fname);
247 xfree (info->buf_mem);
248 logf (LOG_DEBUG, "r_delete: set size %ld", (long) info->pos_end);
251 logf (LOG_DEBUG, "r_delete: unlink %s", info->fname);
252 unlink (info->fname);
256 xfree (info->temp_path);
257 rset_term_destroy (ct->rset_terms[0]);
258 xfree (ct->rset_terms);
263 read from file to window if file is assocated with set -
266 static void r_reread (RSFD rfd)
268 struct rset_temp_info *info = ((struct rset_temp_rfd*)rfd)->info;
275 info->pos_border = ((struct rset_temp_rfd *)rfd)->pos_cur +
277 if (info->pos_border > info->pos_end)
278 info->pos_border = info->pos_end;
279 count = info->pos_border - info->pos_buf;
282 if (lseek (info->fd, info->pos_buf, SEEK_SET) == -1)
284 logf (LOG_FATAL|LOG_ERRNO, "lseek %s", info->fname);
287 if ((r = read (info->fd, info->buf_mem, count)) < (int) count)
290 logf (LOG_FATAL|LOG_ERRNO, "read %s", info->fname);
292 logf (LOG_FATAL, "read of %ld but got %ld",
293 (long) count, (long) r);
299 info->pos_border = info->pos_end;
302 static void r_rewind (RSFD rfd)
304 struct rset_temp_info *info = ((struct rset_temp_rfd*)rfd)->info;
307 ((struct rset_temp_rfd *)rfd)->pos_cur = 0;
310 ((struct rset_temp_rfd *)rfd)->cur=0;
314 static int r_count (RSET ct)
316 struct rset_temp_info *info = (struct rset_temp_info *) ct->buf;
318 return info->pos_end / info->key_size;
321 static int r_read (RSFD rfd, void *buf, int *term_index)
323 struct rset_temp_rfd *mrfd = (struct rset_temp_rfd*) rfd;
324 struct rset_temp_info *info = mrfd->info;
326 size_t nc = mrfd->pos_cur + info->key_size;
328 if (mrfd->pos_cur < info->pos_buf || nc > info->pos_border)
330 if (nc > info->pos_end)
333 info->pos_buf = mrfd->pos_cur;
336 memcpy (buf, info->buf_mem + (mrfd->pos_cur - info->pos_buf),
341 if (*mrfd->countp == 0 || (*info->cmp)(buf, mrfd->buf) > 1)
343 memcpy (mrfd->buf, buf, mrfd->info->key_size);
350 static int r_write (RSFD rfd, const void *buf)
352 struct rset_temp_rfd *mrfd = (struct rset_temp_rfd*) rfd;
353 struct rset_temp_info *info = mrfd->info;
355 size_t nc = mrfd->pos_cur + info->key_size;
357 if (nc > info->pos_buf + info->buf_size)
360 info->pos_buf = mrfd->pos_cur;
361 if (info->pos_buf < info->pos_end)
365 memcpy (info->buf_mem + (mrfd->pos_cur - info->pos_buf), buf,
368 if (nc > info->pos_end)
369 info->pos_border = info->pos_end = nc;
374 static void r_pos (RSFD rfd, double *current, double *total)
376 struct rset_temp_rfd *mrfd = (struct rset_temp_rfd*) rfd;
377 *current=(double) mrfd->cur;
378 *total=(double) mrfd->info->hits;