1 /* $Id: rsisamb.c,v 1.10.2.2 2005-01-14 14:32:25 adam Exp $
2 Copyright (C) 1995-2005
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
28 #include <../index/index.h> /* for log_keydump. Debugging only */
34 static void *r_create(RSET ct, const struct rset_control *sel, void *parms);
35 static RSFD r_open (RSET ct, int flag);
36 static void r_close (RSFD rfd);
37 static void r_delete (RSET ct);
38 static void r_rewind (RSFD rfd);
39 static int r_forward(RSET ct, RSFD rfd, void *buf, int *term_index,
40 int (*cmpfunc)(const void *p1, const void *p2),
41 const void *untilbuf);
42 static void r_pos (RSFD rfd, int *current, int *total);
43 static int r_read (RSFD rfd, void *buf, int *term_index);
44 static int r_write (RSFD rfd, const void *buf);
46 static const struct rset_control control =
60 static const struct rset_control control_forward =
74 /* FIXME - using the default forward reads all items from the isam */
75 /* and thus makes the term counts work OK. On the other hand, it */
76 /* negates the speedup from forwarding */
78 const struct rset_control *rset_kind_isamb = &control;
79 const struct rset_control *rset_kind_isamb_forward = &control_forward;
83 struct rset_pp_info *next;
84 struct rset_isamb_info *info;
89 struct rset_isamb_info {
93 int (*cmp)(const void *p1, const void *p2);
94 struct rset_pp_info *ispt_list;
97 static void *r_create(RSET ct, const struct rset_control *sel, void *parms)
99 rset_isamb_parms *pt = (rset_isamb_parms *) parms;
100 struct rset_isamb_info *info;
102 ct->flags |= RSET_FLAG_VOLATILE;
103 info = (struct rset_isamb_info *) xmalloc (sizeof(*info));
106 info->key_size = pt->key_size;
108 info->ispt_list = NULL;
109 ct->no_rset_terms = 1;
110 ct->rset_terms = (RSET_TERM *) xmalloc (sizeof(*ct->rset_terms));
111 ct->rset_terms[0] = pt->rset_term;
115 RSFD r_open (RSET ct, int flag)
117 struct rset_isamb_info *info = (struct rset_isamb_info *) ct->buf;
118 struct rset_pp_info *ptinfo;
120 logf (LOG_DEBUG, "risamb_open");
121 if (flag & RSETF_WRITE)
123 logf (LOG_FATAL, "ISAMB set type is read-only");
126 ptinfo = (struct rset_pp_info *) xmalloc (sizeof(*ptinfo));
127 ptinfo->next = info->ispt_list;
128 info->ispt_list = ptinfo;
129 ptinfo->pt = isamb_pp_open (info->is, info->pos);
131 if (ct->rset_terms[0]->nn < 0)
132 ct->rset_terms[0]->nn = isamb_pp_num (ptinfo->pt);
133 ct->rset_terms[0]->count = 0;
134 ptinfo->countp = &ct->rset_terms[0]->count;
135 ptinfo->buf = xmalloc (info->key_size);
139 static void r_close (RSFD rfd)
141 struct rset_isamb_info *info = ((struct rset_pp_info*) rfd)->info;
142 struct rset_pp_info **ptinfop;
144 for (ptinfop = &info->ispt_list; *ptinfop; ptinfop = &(*ptinfop)->next)
147 xfree ((*ptinfop)->buf);
148 isamb_pp_close ((*ptinfop)->pt);
149 *ptinfop = (*ptinfop)->next;
153 logf (LOG_FATAL, "r_close but no rfd match!");
157 static void r_delete (RSET ct)
159 struct rset_isamb_info *info = (struct rset_isamb_info *) ct->buf;
161 logf (LOG_DEBUG, "rsisamb_delete");
162 assert (info->ispt_list == NULL);
163 rset_term_destroy (ct->rset_terms[0]);
164 xfree (ct->rset_terms);
168 static void r_rewind (RSFD rfd)
170 logf (LOG_DEBUG, "rsisamb_rewind");
174 static int r_forward(RSET ct, RSFD rfd, void *buf, int *term_index,
175 int (*cmpfunc)(const void *p1, const void *p2),
176 const void *untilbuf)
179 struct rset_pp_info *pinfo = (struct rset_pp_info *) rfd;
181 logf (LOG_DEBUG, "rset_rsisamb_forward starting '%s' (ct=%p rfd=%p)",
182 ct->control->desc, ct,rfd);
183 key_logdump(LOG_DEBUG, untilbuf);
184 key_logdump(LOG_DEBUG, buf);
187 i=isamb_pp_forward(pinfo->pt, buf, untilbuf);
189 logf (LOG_DEBUG, "rset_rsisamb_forward returning %d",i);
194 static void r_pos (RSFD rfd, int *current, int *total)
196 struct rset_pp_info *pinfo = (struct rset_pp_info *) rfd;
198 isamb_pp_pos(pinfo->pt, current, total);
201 static int r_read (RSFD rfd, void *buf, int *term_index)
203 struct rset_pp_info *pinfo = (struct rset_pp_info *) rfd;
206 r = isamb_pp_read(pinfo->pt, buf);
209 if (*pinfo->countp == 0 || (*pinfo->info->cmp)(buf, pinfo->buf) > 1)
211 memcpy (pinfo->buf, buf, pinfo->info->key_size);
218 static int r_write (RSFD rfd, const void *buf)
220 logf (LOG_FATAL, "ISAMB set type is read-only");