2 * Copyright (C) 1994-2002, Index Data
6 * $Id: rsbetween.c,v 1.5 2002-04-12 15:25:03 heikki Exp $
14 #include <rsbetween.h>
17 static void *r_create_between(RSET ct, const struct rset_control *sel, void *parms);
18 static RSFD r_open_between (RSET ct, int flag);
19 static void r_close_between (RSFD rfd);
20 static void r_delete_between (RSET ct);
21 static void r_rewind_between (RSFD rfd);
22 static int r_count_between (RSET ct);
23 static int r_read_between (RSFD rfd, void *buf, int *term_index);
24 static int r_write_between (RSFD rfd, const void *buf);
26 static const struct rset_control control_between =
40 const struct rset_control *rset_kind_between = &control_between;
42 struct rset_between_info {
48 int (*cmp)(const void *p1, const void *p2);
49 char *(*printer)(const void *p1, char *buf);
50 struct rset_between_rfd *rfd_list;
53 struct rset_between_rfd {
67 struct rset_between_rfd *next;
68 struct rset_between_info *info;
71 static void *r_create_between (RSET ct, const struct rset_control *sel, void *parms)
73 rset_between_parms *between_parms = (rset_between_parms *) parms;
74 struct rset_between_info *info;
76 info = (struct rset_between_info *) xmalloc (sizeof(*info));
77 info->key_size = between_parms->key_size;
78 info->rset_l = between_parms->rset_l;
79 info->rset_m = between_parms->rset_m;
80 info->rset_r = between_parms->rset_r;
81 if (rset_is_volatile(info->rset_l) ||
82 rset_is_volatile(info->rset_m) ||
83 rset_is_volatile(info->rset_r))
84 ct->flags |= RSET_FLAG_VOLATILE;
85 info->cmp = between_parms->cmp;
86 info->printer = between_parms->printer;
87 info->rfd_list = NULL;
89 info->term_index_s = info->rset_l->no_rset_terms;
91 info->rset_l->no_rset_terms +
92 info->rset_m->no_rset_terms +
93 info->rset_r->no_rset_terms;
94 ct->rset_terms = (RSET_TERM *)
95 xmalloc (sizeof (*ct->rset_terms) * ct->no_rset_terms);
97 memcpy (ct->rset_terms, info->rset_l->rset_terms,
98 info->rset_l->no_rset_terms * sizeof(*ct->rset_terms));
99 memcpy (ct->rset_terms + info->rset_l->no_rset_terms,
100 info->rset_m->rset_terms,
101 info->rset_m->no_rset_terms * sizeof(*ct->rset_terms));
102 memcpy (ct->rset_terms + info->rset_l->no_rset_terms +
103 info->rset_m->no_rset_terms,
104 info->rset_r->rset_terms,
105 info->rset_r->no_rset_terms * sizeof(*ct->rset_terms));
109 static RSFD r_open_between (RSET ct, int flag)
111 struct rset_between_info *info = (struct rset_between_info *) ct->buf;
112 struct rset_between_rfd *rfd;
114 if (flag & RSETF_WRITE)
116 logf (LOG_FATAL, "between set type is read-only");
119 rfd = (struct rset_between_rfd *) xmalloc (sizeof(*rfd));
120 rfd->next = info->rfd_list;
121 info->rfd_list = rfd;
124 rfd->buf_l = xmalloc (info->key_size);
125 rfd->buf_m = xmalloc (info->key_size);
126 rfd->buf_r = xmalloc (info->key_size);
127 rfd->rfd_l = rset_open (info->rset_l, RSETF_READ);
128 rfd->rfd_m = rset_open (info->rset_m, RSETF_READ);
129 rfd->rfd_r = rset_open (info->rset_r, RSETF_READ);
130 rfd->more_l = rset_read (info->rset_l, rfd->rfd_l, rfd->buf_l,
132 rfd->more_m = rset_read (info->rset_m, rfd->rfd_m, rfd->buf_m,
134 rfd->more_r = rset_read (info->rset_r, rfd->rfd_r, rfd->buf_r,
140 static void r_close_between (RSFD rfd)
142 struct rset_between_info *info = ((struct rset_between_rfd*)rfd)->info;
143 struct rset_between_rfd **rfdp;
145 for (rfdp = &info->rfd_list; *rfdp; rfdp = &(*rfdp)->next)
148 xfree ((*rfdp)->buf_l);
149 xfree ((*rfdp)->buf_m);
150 xfree ((*rfdp)->buf_r);
151 rset_close (info->rset_l, (*rfdp)->rfd_l);
152 rset_close (info->rset_m, (*rfdp)->rfd_m);
153 rset_close (info->rset_r, (*rfdp)->rfd_r);
154 *rfdp = (*rfdp)->next;
158 logf (LOG_FATAL, "r_close_between but no rfd match!");
162 static void r_delete_between (RSET ct)
164 struct rset_between_info *info = (struct rset_between_info *) ct->buf;
166 assert (info->rfd_list == NULL);
167 xfree (ct->rset_terms);
168 rset_delete (info->rset_l);
169 rset_delete (info->rset_m);
170 rset_delete (info->rset_r);
174 static void r_rewind_between (RSFD rfd)
176 struct rset_between_info *info = ((struct rset_between_rfd*)rfd)->info;
177 struct rset_between_rfd *p = (struct rset_between_rfd *) rfd;
179 logf (LOG_DEBUG, "rsbetween_rewind");
180 rset_rewind (info->rset_l, p->rfd_l);
181 rset_rewind (info->rset_m, p->rfd_m);
182 rset_rewind (info->rset_r, p->rfd_r);
183 p->more_l = rset_read (info->rset_l, p->rfd_l, p->buf_l, &p->term_index_l);
184 p->more_m = rset_read (info->rset_m, p->rfd_m, p->buf_m, &p->term_index_m);
185 p->more_r = rset_read (info->rset_r, p->rfd_r, p->buf_r, &p->term_index_r);
189 static int r_count_between (RSET ct)
194 static void logit( struct rset_between_info *info, char *prefix, void *l, void *m, void *r)
199 logf(LOG_DEBUG,"btw: %s l=%s m=%s r=%s",
201 (*info->printer)(l, buf_l),
202 (*info->printer)(m, buf_m),
203 (*info->printer)(r, buf_r) );
206 static int r_read_between (RSFD rfd, void *buf, int *term_index)
208 struct rset_between_rfd *p = (struct rset_between_rfd *) rfd;
209 struct rset_between_info *info = p->info;
215 logit( info, "start of loop", p->buf_l, p->buf_m, p->buf_r);
217 /* forward L until past m, count levels, note rec boundaries */
219 cmp_l= (*info->cmp)(p->buf_l, p->buf_m);
221 cmp_l=2; /* past this record */
222 logf(LOG_DEBUG, "cmp_l=%d", cmp_l);
224 while (cmp_l < 0) /* l before m */
227 p->level=0; /* earlier record */
229 p->level++; /* relevant start tag */
232 p->more_l = rset_read (info->rset_l, p->rfd_l, p->buf_l,
234 cmp_l= (*info->cmp)(p->buf_l, p->buf_m);
235 logit( info, "forwarded L", p->buf_l, p->buf_m, p->buf_r);
236 logf(LOG_DEBUG, " cmp_l=%d", cmp_l);
242 /* forward R until past m, count levels */
244 cmp_r= (*info->cmp)(p->buf_r, p->buf_m);
247 logf(LOG_DEBUG, "cmp_r=%d", cmp_r);
248 while (cmp_r < 0) /* r before m */
250 /* -2, earlier record, doesn't matter */
252 p->level--; /* relevant end tag */
255 p->more_r = rset_read (info->rset_r, p->rfd_r, p->buf_r,
257 cmp_r= (*info->cmp)(p->buf_r, p->buf_m);
258 logit( info, "forwarded R", p->buf_l, p->buf_m, p->buf_r);
259 logf(LOG_DEBUG, " cmp_r=%d", cmp_r);
265 if ( ( p->level <= 0 ) && ! p->more_l)
266 return 0; /* no more start tags, nothing more to find */
268 if ( p->level > 0) /* within a tag pair (or deeper) */
270 memcpy (buf, p->buf_m, info->key_size);
271 *term_index = p->term_index_m;
272 logit( info, "Returning a hit (m)", p->buf_l, p->buf_m, p->buf_r);
273 p->more_m = rset_read (info->rset_m, p->rfd_m, p->buf_m,
278 if ( ! p->more_l ) /* not in data, no more starts */
279 return 0; /* ergo, nothing can be found. stop scanning */
281 p->more_m = rset_read (info->rset_m, p->rfd_m, p->buf_m,
285 logf(LOG_DEBUG,"Exiting, no more stuff in m");
286 return 0; /* no more data possible */
292 static int r_write_between (RSFD rfd, const void *buf)
294 logf (LOG_FATAL, "between set type is read-only");