varlena.h

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/*-------------------------------------------------------------------------
 *
 * varlena.h
 *    Functions for the variable-length built-in types.
 *
 * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/utils/varlena.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef VARLENA_H
#define VARLENA_H
 
#include "nodes/pg_list.h"
#include "utils/sortsupport.h"
 
extern int  varstr_cmp(const char *arg1, int len1, const char *arg2, int len2, Oid collid);
extern void varstr_sortsupport(SortSupport ssup, Oid typid, Oid collid);
extern int  varstr_levenshtein(const char *source, int slen,
                               const char *target, int tlen,
                               int ins_c, int del_c, int sub_c,
                               bool trusted);
extern int  varstr_levenshtein_less_equal(const char *source, int slen,
                                          const char *target, int tlen,
                                          int ins_c, int del_c, int sub_c,
                                          int max_d, bool trusted);
extern List *textToQualifiedNameList(text *textval);
extern char *scan_quoted_identifier(char **endp, char **nextp);
extern char *scan_identifier(char **endp, char **nextp, char separator,
                             bool downcase_unquoted);
extern bool SplitIdentifierString(char *rawstring, char separator,
                                  List **namelist);
extern bool SplitDirectoriesString(char *rawstring, char separator,
                                   List **namelist);
extern bool SplitGUCList(char *rawstring, char separator,
                         List **namelist);
extern text *replace_text_regexp(text *src_text, text *pattern_text,
                                 text *replace_text,
                                 int cflags, Oid collation,
                                 int search_start, int n);
 
typedef struct ClosestMatchState
{
    const char *source;
    int         min_d;
    int         max_d;
    const char *match;
} ClosestMatchState;
 
extern void initClosestMatch(ClosestMatchState *state, const char *source, int max_d);
extern void updateClosestMatch(ClosestMatchState *state, const char *candidate);
extern const char *getClosestMatch(ClosestMatchState *state);
 
#endif