45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* kwlookup.h
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* Key word lookup for PostgreSQL
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*
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*
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* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/common/kwlookup.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef KWLOOKUP_H
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#define KWLOOKUP_H
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/* Hash function used by ScanKeywordLookup */
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typedef int (*ScanKeywordHashFunc) (const void *key, size_t keylen);
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/*
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* This struct contains the data needed by ScanKeywordLookup to perform a
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* search within a set of keywords. The contents are typically generated by
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* src/tools/gen_keywordlist.pl from a header containing PG_KEYWORD macros.
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*/
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typedef struct ScanKeywordList
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{
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const char *kw_string; /* all keywords in order, separated by \0 */
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const uint16 *kw_offsets; /* offsets to the start of each keyword */
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ScanKeywordHashFunc hash; /* perfect hash function for keywords */
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int num_keywords; /* number of keywords */
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int max_kw_len; /* length of longest keyword */
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} ScanKeywordList;
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extern int ScanKeywordLookup(const char *text, const ScanKeywordList *keywords);
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/* Code that wants to retrieve the text of the N'th keyword should use this. */
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static inline const char *
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GetScanKeyword(int n, const ScanKeywordList *keywords)
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{
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return keywords->kw_string + keywords->kw_offsets[n];
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}
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#endif /* KWLOOKUP_H */
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