1 /* $Id: rstemp.c,v 1.43 2004-08-20 14:44:46 heikki 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);
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);
117 static RSFD r_open (RSET ct, int flag)
119 struct rset_temp_info *info = (struct rset_temp_info *) ct->buf;
120 struct rset_temp_rfd *rfd;
122 if (info->fd == -1 && info->fname)
124 if (flag & RSETF_WRITE)
125 info->fd = open (info->fname, O_BINARY|O_RDWR|O_CREAT, 0666);
127 info->fd = open (info->fname, O_BINARY|O_RDONLY);
130 logf (LOG_FATAL|LOG_ERRNO, "open %s", info->fname);
134 rfd = (struct rset_temp_rfd *) xmalloc (sizeof(*rfd));
135 rfd->next = info->rfd_list;
136 info->rfd_list = rfd;
141 rfd->buf = xmalloc (info->key_size);
147 flush current window to file if file is assocated with set
149 static void r_flush (RSFD rfd, int mk)
151 struct rset_temp_info *info = ((struct rset_temp_rfd*) rfd)->info;
153 if (!info->fname && mk)
159 sprintf (template, "%s/zrsXXXXXX", info->temp_path);
161 sprintf (template, "zrsXXXXXX");
163 info->fd = mkstemp (template);
167 logf (LOG_FATAL|LOG_ERRNO, "mkstemp %s", template);
170 info->fname = (char *) xmalloc (strlen(template)+1);
171 strcpy (info->fname, template);
173 char *s = (char*) tempnam (info->temp_path, "zrs");
174 info->fname = (char *) xmalloc (strlen(s)+1);
175 strcpy (info->fname, s);
177 logf (LOG_DEBUG, "creating tempfile %s", info->fname);
178 info->fd = open (info->fname, O_BINARY|O_RDWR|O_CREAT, 0666);
181 logf (LOG_FATAL|LOG_ERRNO, "open %s", info->fname);
186 if (info->fname && info->fd != -1 && info->dirty)
191 if (lseek (info->fd, info->pos_buf, SEEK_SET) == -1)
193 logf (LOG_FATAL|LOG_ERRNO, "lseek %s", info->fname);
196 count = info->buf_size;
197 if (count > info->pos_end - info->pos_buf)
198 count = info->pos_end - info->pos_buf;
199 if ((r = write (info->fd, info->buf_mem, count)) < (int) count)
202 logf (LOG_FATAL|LOG_ERRNO, "read %s", info->fname);
204 logf (LOG_FATAL, "write of %ld but got %ld",
205 (long) count, (long) r);
212 static void r_close (RSFD rfd)
214 struct rset_temp_info *info = ((struct rset_temp_rfd*)rfd)->info;
215 struct rset_temp_rfd **rfdp;
217 for (rfdp = &info->rfd_list; *rfdp; rfdp = &(*rfdp)->next)
221 xfree ((*rfdp)->buf);
223 *rfdp = (*rfdp)->next;
226 if (!info->rfd_list && info->fname && info->fd != -1)
233 logf (LOG_FATAL, "r_close but no rfd match!");
237 static void r_delete (RSET ct)
239 struct rset_temp_info *info = (struct rset_temp_info*) ct->buf;
242 unlink (info->fname);
243 xfree (info->buf_mem);
244 logf (LOG_DEBUG, "r_delete: set size %ld", (long) info->pos_end);
247 logf (LOG_DEBUG, "r_delete: unlink %s", info->fname);
248 unlink (info->fname);
252 xfree (info->temp_path);
257 read from file to window if file is assocated with set -
260 static void r_reread (RSFD rfd)
262 struct rset_temp_info *info = ((struct rset_temp_rfd*)rfd)->info;
269 info->pos_border = ((struct rset_temp_rfd *)rfd)->pos_cur +
271 if (info->pos_border > info->pos_end)
272 info->pos_border = info->pos_end;
273 count = info->pos_border - info->pos_buf;
276 if (lseek (info->fd, info->pos_buf, SEEK_SET) == -1)
278 logf (LOG_FATAL|LOG_ERRNO, "lseek %s", info->fname);
281 if ((r = read (info->fd, info->buf_mem, count)) < (int) count)
284 logf (LOG_FATAL|LOG_ERRNO, "read %s", info->fname);
286 logf (LOG_FATAL, "read of %ld but got %ld",
287 (long) count, (long) r);
293 info->pos_border = info->pos_end;
296 static void r_rewind (RSFD rfd)
298 struct rset_temp_info *info = ((struct rset_temp_rfd*)rfd)->info;
301 ((struct rset_temp_rfd *)rfd)->pos_cur = 0;
304 ((struct rset_temp_rfd *)rfd)->cur=0;
308 static int r_count (RSET ct)
310 struct rset_temp_info *info = (struct rset_temp_info *) ct->buf;
312 return info->pos_end / info->key_size;
315 static int r_read (RSFD rfd, void *buf)
317 struct rset_temp_rfd *mrfd = (struct rset_temp_rfd*) rfd;
318 struct rset_temp_info *info = mrfd->info;
320 size_t nc = mrfd->pos_cur + info->key_size;
322 if (mrfd->pos_cur < info->pos_buf || nc > info->pos_border)
324 if (nc > info->pos_end)
327 info->pos_buf = mrfd->pos_cur;
330 memcpy (buf, info->buf_mem + (mrfd->pos_cur - info->pos_buf),
334 if (*mrfd->countp == 0 || (*info->cmp)(buf, mrfd->buf) > 1)
336 memcpy (mrfd->buf, buf, mrfd->info->key_size);
343 static int r_write (RSFD rfd, const void *buf)
345 struct rset_temp_rfd *mrfd = (struct rset_temp_rfd*) rfd;
346 struct rset_temp_info *info = mrfd->info;
348 size_t nc = mrfd->pos_cur + info->key_size;
350 if (nc > info->pos_buf + info->buf_size)
353 info->pos_buf = mrfd->pos_cur;
354 if (info->pos_buf < info->pos_end)
358 memcpy (info->buf_mem + (mrfd->pos_cur - info->pos_buf), buf,
361 if (nc > info->pos_end)
362 info->pos_border = info->pos_end = nc;
367 static void r_pos (RSFD rfd, double *current, double *total)
369 struct rset_temp_rfd *mrfd = (struct rset_temp_rfd*) rfd;
370 *current=(double) mrfd->cur;
371 *total=(double) mrfd->info->hits;