blob: 3fc3faa0434755ddd8933666b16b2507787f4eb7 (
plain) (
blame)
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
|
/*-------------------------------------------------------------------------
*
* kwlookup.h
* Key word lookup for PostgreSQL
*
*
* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/common/kwlookup.h
*
*-------------------------------------------------------------------------
*/
#ifndef KWLOOKUP_H
#define KWLOOKUP_H
/* Hash function used by ScanKeywordLookup */
typedef int (*ScanKeywordHashFunc) (const void *key, size_t keylen);
/*
* This struct contains the data needed by ScanKeywordLookup to perform a
* search within a set of keywords. The contents are typically generated by
* src/tools/gen_keywordlist.pl from a header containing PG_KEYWORD macros.
*/
typedef struct ScanKeywordList
{
const char *kw_string; /* all keywords in order, separated by \0 */
const uint16 *kw_offsets; /* offsets to the start of each keyword */
ScanKeywordHashFunc hash; /* perfect hash function for keywords */
int num_keywords; /* number of keywords */
int max_kw_len; /* length of longest keyword */
} ScanKeywordList;
extern int ScanKeywordLookup(const char *str, const ScanKeywordList *keywords);
/* Code that wants to retrieve the text of the N'th keyword should use this. */
static inline const char *
GetScanKeyword(int n, const ScanKeywordList *keywords)
{
return keywords->kw_string + keywords->kw_offsets[n];
}
#endif /* KWLOOKUP_H */
|
