IDZEBRA  2.1.2
rsnull.c
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1 /* This file is part of the Zebra server.
2  Copyright (C) Index Data
3 
4 Zebra is free software; you can redistribute it and/or modify it under
5 the terms of the GNU General Public License as published by the Free
6 Software Foundation; either version 2, or (at your option) any later
7 version.
8 
9 Zebra is distributed in the hope that it will be useful, but WITHOUT ANY
10 WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 for more details.
13 
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 
18 */
19 
20 #if HAVE_CONFIG_H
21 #include <config.h>
22 #endif
23 #include <stdio.h>
24 #include <assert.h>
25 #include <idzebra/util.h>
26 #include <rset.h>
27 
28 static RSFD r_open(RSET ct, int flag);
29 static void r_close(RSFD rfd);
30 static void r_delete(RSET ct);
31 static void r_pos(RSFD rfd, double *current, double *total);
32 static int r_read(RSFD rfd, void *buf, TERMID *term);
33 
34 static const struct rset_control control =
35 {
36  "null",
37  r_delete,
39  r_open,
40  r_close,
41  0, /* no forward */
42  r_pos,
43  r_read,
45 };
46 
47 RSET rset_create_null(NMEM nmem, struct rset_key_control *kcontrol,
48  TERMID term)
49 {
50  RSET rnew = rset_create_base(&control, nmem, kcontrol, 0, term, 0, 0);
51  rnew->priv = 0;
52  return rnew;
53 }
54 
55 static RSFD r_open(RSET ct, int flag)
56 {
57  RSFD rfd;
58  if (flag & RSETF_WRITE)
59  {
60  yaz_log (YLOG_FATAL, "NULL set type is read-only");
61  return NULL;
62  }
63  rfd = rfd_create_base(ct);
64  rfd->priv = 0;
65  return rfd;
66 }
67 
68 static void r_close(RSFD rfd)
69 {
70 }
71 
72 static void r_delete(RSET ct)
73 {
74 }
75 
76 static void r_pos(RSFD rfd, double *current, double *total)
77 {
78  assert(rfd);
79  assert(current);
80  assert(total);
81  *total = 0;
82  *current = 0;
83 }
84 
85 static int r_read(RSFD rfd, void *buf, TERMID *term)
86 {
87  if (term)
88  *term = 0;
89  return 0;
90 }
91 
92 /*
93  * Local variables:
94  * c-basic-offset: 4
95  * c-file-style: "Stroustrup"
96  * indent-tabs-mode: nil
97  * End:
98  * vim: shiftwidth=4 tabstop=8 expandtab
99  */
100 
void * buf
Definition: rsisamb.c:65
static const struct rset_control control
Definition: rsnull.c:34
RSFD rfd_create_base(RSET rs)
Common constuctor for RFDs.
Definition: rset.c:43
static void r_delete(RSET ct)
Definition: rsnull.c:72
static int r_read(RSFD rfd, void *buf, TERMID *term)
Definition: rsnull.c:85
int rset_no_write(RSFD rfd, const void *buf)
Definition: rset.c:431
static void r_close(RSFD rfd)
Definition: rsnull.c:68
void * priv
Definition: rset.h:155
void rset_get_one_term(RSET ct, TERMID *terms, int maxterms, int *curterm)
is a getterms function for those that don&#39;t have any
Definition: rset.c:291
RSET rset_create_null(NMEM nmem, struct rset_key_control *kcontrol, TERMID term)
Definition: rsnull.c:47
static void r_pos(RSFD rfd, double *current, double *total)
Definition: rsnull.c:76
Definition: rset.h:150
Definition: rset.h:73
void * priv
Definition: rset.h:75
Definition: rset.h:50
static RSFD r_open(RSET ct, int flag)
Definition: rsnull.c:55
RSET rset_create_base(const struct rset_control *sel, NMEM nmem, struct rset_key_control *kcontrol, int scope, TERMID term, int no_children, RSET *children)
Common constuctor for RSETs.
Definition: rset.c:164
#define RSETF_WRITE
Definition: rset.h:200