Age Owner Branch data TLA Line data Source code
1 : : /*-------------------------------------------------------------------------
2 : : *
3 : : * kwlookup.h
4 : : * Key word lookup for PostgreSQL
5 : : *
6 : : *
7 : : * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
8 : : * Portions Copyright (c) 1994, Regents of the University of California
9 : : *
10 : : * src/include/common/kwlookup.h
11 : : *
12 : : *-------------------------------------------------------------------------
13 : : */
14 : : #ifndef KWLOOKUP_H
15 : : #define KWLOOKUP_H
16 : :
17 : : /* Hash function used by ScanKeywordLookup */
18 : : typedef int (*ScanKeywordHashFunc) (const void *key, size_t keylen);
19 : :
20 : : /*
21 : : * This struct contains the data needed by ScanKeywordLookup to perform a
22 : : * search within a set of keywords. The contents are typically generated by
23 : : * src/tools/gen_keywordlist.pl from a header containing PG_KEYWORD macros.
24 : : */
25 : : typedef struct ScanKeywordList
26 : : {
27 : : const char *kw_string; /* all keywords in order, separated by \0 */
28 : : const uint16 *kw_offsets; /* offsets to the start of each keyword */
29 : : ScanKeywordHashFunc hash; /* perfect hash function for keywords */
30 : : int num_keywords; /* number of keywords */
31 : : int max_kw_len; /* length of longest keyword */
32 : : } ScanKeywordList;
33 : :
34 : :
35 : : extern int ScanKeywordLookup(const char *str, const ScanKeywordList *keywords);
36 : :
37 : : /* Code that wants to retrieve the text of the N'th keyword should use this. */
38 : : static inline const char *
1925 tgl@sss.pgh.pa.us 39 :CBC 5851316 : GetScanKeyword(int n, const ScanKeywordList *keywords)
40 : : {
41 : 5851316 : return keywords->kw_string + keywords->kw_offsets[n];
42 : : }
43 : :
44 : : #endif /* KWLOOKUP_H */
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