1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
/*-------------------------------------------------------------------------
*
* ts_utils.c
* various support functions
*
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
*
*
* IDENTIFICATION
* src/backend/tsearch/ts_utils.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <ctype.h>
#include "miscadmin.h"
#include "tsearch/ts_locale.h"
#include "tsearch/ts_utils.h"
/*
* Given the base name and extension of a tsearch config file, return
* its full path name. The base name is assumed to be user-supplied,
* and is checked to prevent pathname attacks. The extension is assumed
* to be safe.
*
* The result is a palloc'd string.
*/
char *
get_tsearch_config_filename(const char *basename,
const char *extension)
{
char sharepath[MAXPGPATH];
char *result;
/*
* We limit the basename to contain a-z, 0-9, and underscores. This may
* be overly restrictive, but we don't want to allow access to anything
* outside the tsearch_data directory, so for instance '/' *must* be
* rejected, and on some platforms '\' and ':' are risky as well. Allowing
* uppercase might result in incompatible behavior between case-sensitive
* and case-insensitive filesystems, and non-ASCII characters create other
* interesting risks, so on the whole a tight policy seems best.
*/
if (strspn(basename, "abcdefghijklmnopqrstuvwxyz0123456789_") != strlen(basename))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid text search configuration file name \"%s\"",
basename)));
get_share_path(my_exec_path, sharepath);
result = palloc(MAXPGPATH);
snprintf(result, MAXPGPATH, "%s/tsearch_data/%s.%s",
sharepath, basename, extension);
return result;
}
static int
comparestr(const void *a, const void *b)
{
return strcmp(*(char * const *) a, *(char * const *) b);
}
/*
* Reads a stop-word file. Each word is run through 'wordop'
* function, if given. wordop may either modify the input in-place,
* or palloc a new version.
*/
void
readstoplist(const char *fname, StopList *s, char *(*wordop) (const char *))
{
char **stop = NULL;
s->len = 0;
if (fname && *fname)
{
char *filename = get_tsearch_config_filename(fname, "stop");
tsearch_readline_state trst;
char *line;
int reallen = 0;
if (!tsearch_readline_begin(&trst, filename))
ereport(ERROR,
(errcode(ERRCODE_CONFIG_FILE_ERROR),
errmsg("could not open stop-word file \"%s\": %m",
filename)));
while ((line = tsearch_readline(&trst)) != NULL)
{
char *pbuf = line;
/* Trim trailing space */
while (*pbuf && !t_isspace(pbuf))
pbuf += pg_mblen(pbuf);
*pbuf = '\0';
/* Skip empty lines */
if (*line == '\0')
{
pfree(line);
continue;
}
if (s->len >= reallen)
{
if (reallen == 0)
{
reallen = 64;
stop = (char **) palloc(sizeof(char *) * reallen);
}
else
{
reallen *= 2;
stop = (char **) repalloc((void *) stop,
sizeof(char *) * reallen);
}
}
if (wordop)
{
stop[s->len] = wordop(line);
if (stop[s->len] != line)
pfree(line);
}
else
stop[s->len] = line;
(s->len)++;
}
tsearch_readline_end(&trst);
pfree(filename);
}
s->stop = stop;
/* Sort to allow binary searching */
if (s->stop && s->len > 0)
qsort(s->stop, s->len, sizeof(char *), comparestr);
}
bool
searchstoplist(StopList *s, char *key)
{
return (s->stop && s->len > 0 &&
bsearch(&key, s->stop, s->len,
sizeof(char *), comparestr)) ? true : false;
}
|
