1 /* $Id: rsbetween.c,v 1.7 2002-08-02 19:26:57 adam 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 =
56 const struct rset_control *rset_kind_between = &control_between;
58 struct rset_between_info {
65 int (*cmp)(const void *p1, const void *p2);
66 char *(*printer)(const void *p1, char *buf);
67 struct rset_between_rfd *rfd_list;
70 struct rset_between_rfd {
87 struct rset_between_rfd *next;
88 struct rset_between_info *info;
91 static void *r_create_between (RSET ct, const struct rset_control *sel,
94 rset_between_parms *between_parms = (rset_between_parms *) parms;
95 struct rset_between_info *info;
97 info = (struct rset_between_info *) xmalloc (sizeof(*info));
98 info->key_size = between_parms->key_size;
99 info->rset_l = between_parms->rset_l;
100 info->rset_m = between_parms->rset_m;
101 info->rset_r = between_parms->rset_r;
102 info->rset_attr = between_parms->rset_attr;
103 if (rset_is_volatile(info->rset_l) ||
104 rset_is_volatile(info->rset_m) ||
105 rset_is_volatile(info->rset_r))
106 ct->flags |= RSET_FLAG_VOLATILE;
107 info->cmp = between_parms->cmp;
108 info->printer = between_parms->printer;
109 info->rfd_list = NULL;
111 info->term_index_s = info->rset_l->no_rset_terms;
115 info->rset_l->no_rset_terms +
116 info->rset_m->no_rset_terms +
117 info->rset_r->no_rset_terms;
118 ct->rset_terms = (RSET_TERM *)
119 xmalloc (sizeof (*ct->rset_terms) * ct->no_rset_terms);
120 memcpy (ct->rset_terms, info->rset_l->rset_terms,
121 info->rset_l->no_rset_terms * sizeof(*ct->rset_terms));
122 memcpy (ct->rset_terms + info->rset_l->no_rset_terms,
123 info->rset_m->rset_terms,
124 info->rset_m->no_rset_terms * sizeof(*ct->rset_terms));
125 memcpy (ct->rset_terms + info->rset_l->no_rset_terms +
126 info->rset_m->no_rset_terms,
127 info->rset_r->rset_terms,
128 info->rset_r->no_rset_terms * sizeof(*ct->rset_terms));
133 info->rset_l->no_rset_terms +
134 info->rset_r->no_rset_terms;
135 ct->rset_terms = (RSET_TERM *)
136 xmalloc (sizeof (*ct->rset_terms) * ct->no_rset_terms);
137 memcpy (ct->rset_terms, info->rset_l->rset_terms,
138 info->rset_l->no_rset_terms * sizeof(*ct->rset_terms));
139 memcpy (ct->rset_terms + info->rset_l->no_rset_terms,
140 info->rset_r->rset_terms,
141 info->rset_r->no_rset_terms * sizeof(*ct->rset_terms));
147 static RSFD r_open_between (RSET ct, int flag)
149 struct rset_between_info *info = (struct rset_between_info *) ct->buf;
150 struct rset_between_rfd *rfd;
152 if (flag & RSETF_WRITE)
154 logf (LOG_FATAL, "between set type is read-only");
157 rfd = (struct rset_between_rfd *) xmalloc (sizeof(*rfd));
158 rfd->next = info->rfd_list;
159 info->rfd_list = rfd;
162 rfd->buf_l = xmalloc (info->key_size);
163 rfd->buf_m = xmalloc (info->key_size);
164 rfd->buf_r = xmalloc (info->key_size);
165 rfd->buf_attr = xmalloc (info->key_size);
167 rfd->rfd_l = rset_open (info->rset_l, RSETF_READ);
168 rfd->rfd_m = rset_open (info->rset_m, RSETF_READ);
169 rfd->rfd_r = rset_open (info->rset_r, RSETF_READ);
171 rfd->more_l = rset_read (info->rset_l, rfd->rfd_l, rfd->buf_l,
173 rfd->more_m = rset_read (info->rset_m, rfd->rfd_m, rfd->buf_m,
175 rfd->more_r = rset_read (info->rset_r, rfd->rfd_r, rfd->buf_r,
180 rfd->rfd_attr = rset_open (info->rset_attr, RSETF_READ);
181 rfd->more_attr = rset_read (info->rset_attr, rfd->rfd_attr,
182 rfd->buf_attr, &dummy);
188 static void r_close_between (RSFD rfd)
190 struct rset_between_info *info = ((struct rset_between_rfd*)rfd)->info;
191 struct rset_between_rfd **rfdp;
193 for (rfdp = &info->rfd_list; *rfdp; rfdp = &(*rfdp)->next)
196 xfree ((*rfdp)->buf_l);
197 xfree ((*rfdp)->buf_m);
198 xfree ((*rfdp)->buf_r);
199 xfree ((*rfdp)->buf_attr);
200 rset_close (info->rset_l, (*rfdp)->rfd_l);
201 rset_close (info->rset_m, (*rfdp)->rfd_m);
202 rset_close (info->rset_r, (*rfdp)->rfd_r);
204 rset_close (info->rset_attr, (*rfdp)->rfd_attr);
206 *rfdp = (*rfdp)->next;
210 logf (LOG_FATAL, "r_close_between but no rfd match!");
214 static void r_delete_between (RSET ct)
216 struct rset_between_info *info = (struct rset_between_info *) ct->buf;
218 assert (info->rfd_list == NULL);
219 xfree (ct->rset_terms);
220 rset_delete (info->rset_l);
221 rset_delete (info->rset_m);
222 rset_delete (info->rset_r);
224 rset_delete (info->rset_attr);
228 static void r_rewind_between (RSFD rfd)
230 struct rset_between_info *info = ((struct rset_between_rfd*)rfd)->info;
231 struct rset_between_rfd *p = (struct rset_between_rfd *) rfd;
233 logf (LOG_DEBUG, "rsbetween_rewind");
234 rset_rewind (info->rset_l, p->rfd_l);
235 rset_rewind (info->rset_m, p->rfd_m);
236 rset_rewind (info->rset_r, p->rfd_r);
237 p->more_l = rset_read (info->rset_l, p->rfd_l, p->buf_l, &p->term_index_l);
238 p->more_m = rset_read (info->rset_m, p->rfd_m, p->buf_m, &p->term_index_m);
239 p->more_r = rset_read (info->rset_r, p->rfd_r, p->buf_r, &p->term_index_r);
243 rset_rewind (info->rset_attr, p->rfd_attr);
244 p->more_attr = rset_read (info->rset_attr, p->rfd_attr, p->buf_attr,
250 static int r_count_between (RSET ct)
255 static void logit( struct rset_between_info *info, char *prefix, void *l, void *m, void *r)
260 logf(LOG_DEBUG,"btw: %s l=%s m=%s r=%s",
262 (*info->printer)(l, buf_l),
263 (*info->printer)(m, buf_m),
264 (*info->printer)(r, buf_r) );
267 static int r_read_between (RSFD rfd, void *buf, int *term_index)
269 struct rset_between_rfd *p = (struct rset_between_rfd *) rfd;
270 struct rset_between_info *info = p->info;
277 logit( info, "start of loop", p->buf_l, p->buf_m, p->buf_r);
279 /* forward L until past m, count levels, note rec boundaries */
281 cmp_l= (*info->cmp)(p->buf_l, p->buf_m);
283 cmp_l=2; /* past this record */
284 logf(LOG_DEBUG, "cmp_l=%d", cmp_l);
286 while (cmp_l < 0) /* l before m */
289 p->level=0; /* earlier record */
292 p->level++; /* relevant start tag */
294 if (!info->rset_attr)
303 cmp_attr = (*info->cmp)(p->buf_attr, p->buf_l);
309 else if (cmp_attr > 0)
311 p->more_attr = rset_read (info->rset_attr, p->rfd_attr,
312 p->buf_attr, &dummy_term);
318 p->more_l = rset_read (info->rset_l, p->rfd_l, p->buf_l,
320 cmp_l= (*info->cmp)(p->buf_l, p->buf_m);
321 logit( info, "forwarded L", p->buf_l, p->buf_m, p->buf_r);
322 logf(LOG_DEBUG, " cmp_l=%d", cmp_l);
329 /* forward R until past m, count levels */
331 cmp_r= (*info->cmp)(p->buf_r, p->buf_m);
334 logf(LOG_DEBUG, "cmp_r=%d", cmp_r);
335 while (cmp_r < 0) /* r before m */
337 /* -2, earlier record, doesn't matter */
339 p->level--; /* relevant end tag */
342 p->more_r = rset_read (info->rset_r, p->rfd_r, p->buf_r,
344 cmp_r= (*info->cmp)(p->buf_r, p->buf_m);
345 logit( info, "forwarded R", p->buf_l, p->buf_m, p->buf_r);
346 logf(LOG_DEBUG, " cmp_r=%d", cmp_r);
352 if ( ( p->level <= 0 ) && ! p->more_l)
353 return 0; /* no more start tags, nothing more to find */
355 if ( attr_match && p->level > 0) /* within a tag pair (or deeper) */
357 memcpy (buf, p->buf_m, info->key_size);
358 *term_index = p->term_index_m;
359 logit( info, "Returning a hit (m)", p->buf_l, p->buf_m, p->buf_r);
360 p->more_m = rset_read (info->rset_m, p->rfd_m, p->buf_m,
365 if ( ! p->more_l ) /* not in data, no more starts */
366 return 0; /* ergo, nothing can be found. stop scanning */
368 p->more_m = rset_read (info->rset_m, p->rfd_m, p->buf_m,
372 logf(LOG_DEBUG,"Exiting, no more stuff in m");
373 return 0; /* no more data possible */
379 static int r_write_between (RSFD rfd, const void *buf)
381 logf (LOG_FATAL, "between set type is read-only");