Age         Owner                  TLA  Line data    Source code

                                  1                 : /*-------------------------------------------------------------------------
                                  2                 :  *
                                  3                 :  * kwlookup.h
                                  4                 :  *    Key word lookup for PostgreSQL
                                  5                 :  *
                                  6                 :  *
                                  7                 :  * Portions Copyright (c) 1996-2023, 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 *
 1554 tgl                        39 CBC    11149844 : GetScanKeyword(int n, const ScanKeywordList *keywords)
                                 40                 : {
                                 41        11149844 :     return keywords->kw_string + keywords->kw_offsets[n];
                                 42                 : }
                                 43                 : 
                                 44                 : #endif                          /* KWLOOKUP_H */