1 /* $Id: rsbetween.c,v 1.10 2004-01-16 15:27:35 heikki Exp $
2 Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002
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
30 #include <rsbetween.h>
33 static void *r_create_between(RSET ct, const struct rset_control *sel, void *parms);
34 static RSFD r_open_between (RSET ct, int flag);
35 static void r_close_between (RSFD rfd);
36 static void r_delete_between (RSET ct);
37 static void r_rewind_between (RSFD rfd);
38 static int r_count_between (RSET ct);
39 static int r_read_between (RSFD rfd, void *buf, int *term_index);
40 static int r_write_between (RSFD rfd, const void *buf);
42 static const struct rset_control control_between =
57 const struct rset_control *rset_kind_between = &control_between;
59 struct rset_between_info {
66 int (*cmp)(const void *p1, const void *p2);
67 char *(*printer)(const void *p1, char *buf);
68 struct rset_between_rfd *rfd_list;
71 struct rset_between_rfd {
88 struct rset_between_rfd *next;
89 struct rset_between_info *info;
92 static void *r_create_between (RSET ct, const struct rset_control *sel,
95 rset_between_parms *between_parms = (rset_between_parms *) parms;
96 struct rset_between_info *info;
98 info = (struct rset_between_info *) xmalloc (sizeof(*info));
99 info->key_size = between_parms->key_size;
100 info->rset_l = between_parms->rset_l;
101 info->rset_m = between_parms->rset_m;
102 info->rset_r = between_parms->rset_r;
103 info->rset_attr = between_parms->rset_attr;
104 if (rset_is_volatile(info->rset_l) ||
105 rset_is_volatile(info->rset_m) ||
106 rset_is_volatile(info->rset_r))
107 ct->flags |= RSET_FLAG_VOLATILE;
108 info->cmp = between_parms->cmp;
109 info->printer = between_parms->printer;
110 info->rfd_list = NULL;
112 info->term_index_s = info->rset_l->no_rset_terms;
116 info->rset_l->no_rset_terms +
117 info->rset_m->no_rset_terms +
118 info->rset_r->no_rset_terms;
119 ct->rset_terms = (RSET_TERM *)
120 xmalloc (sizeof (*ct->rset_terms) * ct->no_rset_terms);
121 memcpy (ct->rset_terms, info->rset_l->rset_terms,
122 info->rset_l->no_rset_terms * sizeof(*ct->rset_terms));
123 memcpy (ct->rset_terms + info->rset_l->no_rset_terms,
124 info->rset_m->rset_terms,
125 info->rset_m->no_rset_terms * sizeof(*ct->rset_terms));
126 memcpy (ct->rset_terms + info->rset_l->no_rset_terms +
127 info->rset_m->no_rset_terms,
128 info->rset_r->rset_terms,
129 info->rset_r->no_rset_terms * sizeof(*ct->rset_terms));
134 info->rset_l->no_rset_terms +
135 info->rset_r->no_rset_terms;
136 ct->rset_terms = (RSET_TERM *)
137 xmalloc (sizeof (*ct->rset_terms) * ct->no_rset_terms);
138 memcpy (ct->rset_terms, info->rset_l->rset_terms,
139 info->rset_l->no_rset_terms * sizeof(*ct->rset_terms));
140 memcpy (ct->rset_terms + info->rset_l->no_rset_terms,
141 info->rset_r->rset_terms,
142 info->rset_r->no_rset_terms * sizeof(*ct->rset_terms));
148 static RSFD r_open_between (RSET ct, int flag)
150 struct rset_between_info *info = (struct rset_between_info *) ct->buf;
151 struct rset_between_rfd *rfd;
153 if (flag & RSETF_WRITE)
155 logf (LOG_FATAL, "between set type is read-only");
158 rfd = (struct rset_between_rfd *) xmalloc (sizeof(*rfd));
159 rfd->next = info->rfd_list;
160 info->rfd_list = rfd;
163 rfd->buf_l = xmalloc (info->key_size);
164 rfd->buf_m = xmalloc (info->key_size);
165 rfd->buf_r = xmalloc (info->key_size);
166 rfd->buf_attr = xmalloc (info->key_size);
168 rfd->rfd_l = rset_open (info->rset_l, RSETF_READ);
169 rfd->rfd_m = rset_open (info->rset_m, RSETF_READ);
170 rfd->rfd_r = rset_open (info->rset_r, RSETF_READ);
172 rfd->more_l = rset_read (info->rset_l, rfd->rfd_l, rfd->buf_l,
174 rfd->more_m = rset_read (info->rset_m, rfd->rfd_m, rfd->buf_m,
176 rfd->more_r = rset_read (info->rset_r, rfd->rfd_r, rfd->buf_r,
181 rfd->rfd_attr = rset_open (info->rset_attr, RSETF_READ);
182 rfd->more_attr = rset_read (info->rset_attr, rfd->rfd_attr,
183 rfd->buf_attr, &dummy);
189 static void r_close_between (RSFD rfd)
191 struct rset_between_info *info = ((struct rset_between_rfd*)rfd)->info;
192 struct rset_between_rfd **rfdp;
194 for (rfdp = &info->rfd_list; *rfdp; rfdp = &(*rfdp)->next)
197 xfree ((*rfdp)->buf_l);
198 xfree ((*rfdp)->buf_m);
199 xfree ((*rfdp)->buf_r);
200 xfree ((*rfdp)->buf_attr);
201 rset_close (info->rset_l, (*rfdp)->rfd_l);
202 rset_close (info->rset_m, (*rfdp)->rfd_m);
203 rset_close (info->rset_r, (*rfdp)->rfd_r);
205 rset_close (info->rset_attr, (*rfdp)->rfd_attr);
207 *rfdp = (*rfdp)->next;
211 logf (LOG_FATAL, "r_close_between but no rfd match!");
215 static void r_delete_between (RSET ct)
217 struct rset_between_info *info = (struct rset_between_info *) ct->buf;
219 assert (info->rfd_list == NULL);
220 xfree (ct->rset_terms);
221 rset_delete (info->rset_l);
222 rset_delete (info->rset_m);
223 rset_delete (info->rset_r);
225 rset_delete (info->rset_attr);
229 static void r_rewind_between (RSFD rfd)
231 struct rset_between_info *info = ((struct rset_between_rfd*)rfd)->info;
232 struct rset_between_rfd *p = (struct rset_between_rfd *) rfd;
234 logf (LOG_DEBUG, "rsbetween_rewind");
235 rset_rewind (info->rset_l, p->rfd_l);
236 rset_rewind (info->rset_m, p->rfd_m);
237 rset_rewind (info->rset_r, p->rfd_r);
238 p->more_l = rset_read (info->rset_l, p->rfd_l, p->buf_l, &p->term_index_l);
239 p->more_m = rset_read (info->rset_m, p->rfd_m, p->buf_m, &p->term_index_m);
240 p->more_r = rset_read (info->rset_r, p->rfd_r, p->buf_r, &p->term_index_r);
244 rset_rewind (info->rset_attr, p->rfd_attr);
245 p->more_attr = rset_read (info->rset_attr, p->rfd_attr, p->buf_attr,
251 static int r_count_between (RSET ct)
257 static void log2 (struct rset_between_rfd *p, char *msg, int cmp_l, int cmp_r)
262 logf(LOG_DEBUG,"btw: %s l=%s(%d/%d) m=%s(%d) r=%s(%d/%d), lev=%d",
264 (*p->info->printer)(p->buf_l, buf_l), p->more_l, cmp_l,
265 (*p->info->printer)(p->buf_m, buf_m), p->more_m,
266 (*p->info->printer)(p->buf_r, buf_r), p->more_r, cmp_r,
270 static int r_read_between (RSFD rfd, void *buf, int *term_index)
272 struct rset_between_rfd *p = (struct rset_between_rfd *) rfd;
273 struct rset_between_info *info = p->info;
280 log2( p, "start of loop", cmp_l, cmp_r);
282 /* forward L until past m, count levels, note rec boundaries */
284 cmp_l= (*info->cmp)(p->buf_l, p->buf_m);
288 cmp_l=2; /* past this record */
290 log2( p, "after first L", cmp_l, cmp_r);
292 while (cmp_l < 0) /* l before m */
295 p->level=0; /* earlier record */
298 p->level++; /* relevant start tag */
300 if (!info->rset_attr)
309 cmp_attr = (*info->cmp)(p->buf_attr, p->buf_l);
315 else if (cmp_attr > 0)
317 p->more_attr = rset_read (info->rset_attr, p->rfd_attr,
318 p->buf_attr, &dummy_term);
322 p->more_l = rset_read (info->rset_l, p->rfd_l, p->buf_l,
326 cmp_l= (*info->cmp)(p->buf_l, p->buf_m);
330 log2( p, "end of L loop", cmp_l, cmp_r);
334 /* forward R until past m, count levels */
335 log2( p, "Before moving R", cmp_l, cmp_r);
337 cmp_r= (*info->cmp)(p->buf_r, p->buf_m);
340 log2( p, "after first R", cmp_l, cmp_r);
341 while (cmp_r < 0) /* r before m */
343 /* -2, earlier record, doesn't matter */
345 p->level--; /* relevant end tag */
348 p->more_r = rset_read (info->rset_r, p->rfd_r, p->buf_r,
350 cmp_r= (*info->cmp)(p->buf_r, p->buf_m);
354 log2( p, "End of R loop", cmp_l, cmp_r);
357 if ( ( p->level <= 0 ) && ! p->more_l)
358 return 0; /* no more start tags, nothing more to find */
360 if ( attr_match && p->level > 0) /* within a tag pair (or deeper) */
362 memcpy (buf, p->buf_m, info->key_size);
363 *term_index = p->term_index_m;
364 log2( p, "Returning a hit (and forwarding m)", cmp_l, cmp_r);
365 p->more_m = rset_read (info->rset_m, p->rfd_m, p->buf_m,
371 else if ( ! p->more_l ) /* not in data, no more starts */
373 log2( p, "no more starts, exiting without a hit", cmp_l, cmp_r);
374 return 0; /* ergo, nothing can be found. stop scanning */
378 p->more_m = rset_read (info->rset_m, p->rfd_m, p->buf_m,
380 log2( p, "End of M loop", cmp_l, cmp_r);
383 log2( p, "Exiting, nothing more in m", cmp_l, cmp_r);
384 return 0; /* no more data possible */
390 static int r_write_between (RSFD rfd, const void *buf)
392 logf (LOG_FATAL, "between set type is read-only");