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tsearch: use database default collation for parsing.

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Previously, tsearch used the database's CTYPE setting, which only
matches the database default collation if the locale provider is libc.

Note that tsearch types (tsvector and tsquery) are not collatable
types. The locale affects parsing the original text, which is a lossy
process, so a COLLATE clause on the already-parsed value would not
make sense.

Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Discussion: https://postgr.es/m/0151ad01239e2cc7b3139644358cf8f7b9622ff7.camel@j-davis.com
This commit is contained in:
Jeff Davis
2025-10-21 09:31:49 -07:00
parent 776c2c2ae2
commit e113f9c102
2 changed files with 27 additions and 84 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
src/backend/tsearch/ts_locale.c
View File

@@ -20,45 +20,33 @@
static void tsearch_readline_callback(void *arg);
/*
* The reason these functions use a 3-wchar_t output buffer, not 2 as you
* might expect, is that on Windows "wchar_t" is 16 bits and what we'll be
* getting from char2wchar() is UTF16 not UTF32. A single input character
* may therefore produce a surrogate pair rather than just one wchar_t;
* we also need room for a trailing null. When we do get a surrogate pair,
* we pass just the first code to iswdigit() etc, so that these functions will
* always return false for characters outside the Basic Multilingual Plane.
*/
#define WC_BUF_LEN 3
/* space for a single character plus a trailing NUL */
#define WC_BUF_LEN 2
int
t_isalpha(const char *ptr)
{
int clen = pg_mblen(ptr);
wchar_t character[WC_BUF_LEN];
locale_t mylocale = 0; /* TODO */
pg_wchar wstr[WC_BUF_LEN];
int wlen pg_attribute_unused();
if (clen == 1 || database_ctype_is_c)
return isalpha(TOUCHAR(ptr));
wlen = pg_mb2wchar_with_len(ptr, wstr, pg_mblen(ptr));
Assert(wlen <= 1);
char2wchar(character, WC_BUF_LEN, ptr, clen, mylocale);
return iswalpha((wint_t) character[0]);
/* pass single character, or NUL if empty */
return pg_iswalpha(wstr[0], pg_database_locale());
}
int
t_isalnum(const char *ptr)
{
int clen = pg_mblen(ptr);
wchar_t character[WC_BUF_LEN];
locale_t mylocale = 0; /* TODO */
pg_wchar wstr[WC_BUF_LEN];
int wlen pg_attribute_unused();
if (clen == 1 || database_ctype_is_c)
return isalnum(TOUCHAR(ptr));
wlen = pg_mb2wchar_with_len(ptr, wstr, pg_mblen(ptr));
Assert(wlen <= 1);
char2wchar(character, WC_BUF_LEN, ptr, clen, mylocale);
return iswalnum((wint_t) character[0]);
/* pass single character, or NUL if empty */
return pg_iswalnum(wstr[0], pg_database_locale());
}

71
src/backend/tsearch/wparser_def.c
View File

@@ -243,9 +243,7 @@ typedef struct TParser
/* string and position information */
char *str; /* multibyte string */
int lenstr; /* length of mbstring */
wchar_t *wstr; /* wide character string */
pg_wchar *pgwstr; /* wide character string for C-locale */
bool usewide;
/* State of parse */
int charmaxlen;
@@ -293,33 +291,8 @@ TParserInit(char *str, int len)
prs->charmaxlen = pg_database_encoding_max_length();
prs->str = str;
prs->lenstr = len;
/*
* Use wide char code only when max encoding length > 1.
*/
if (prs->charmaxlen > 1)
{
locale_t mylocale = 0; /* TODO */
prs->usewide = true;
if (database_ctype_is_c)
{
/*
* char2wchar doesn't work for C-locale and sizeof(pg_wchar) could
* be different from sizeof(wchar_t)
*/
prs->pgwstr = (pg_wchar *) palloc(sizeof(pg_wchar) * (prs->lenstr + 1));
pg_mb2wchar_with_len(prs->str, prs->pgwstr, prs->lenstr);
}
else
{
prs->wstr = (wchar_t *) palloc(sizeof(wchar_t) * (prs->lenstr + 1));
char2wchar(prs->wstr, prs->lenstr + 1, prs->str, prs->lenstr,
mylocale);
}
}
else
prs->usewide = false;
prs->pgwstr = (pg_wchar *) palloc(sizeof(pg_wchar) * (prs->lenstr + 1));
pg_mb2wchar_with_len(prs->str, prs->pgwstr, prs->lenstr);
prs->state = newTParserPosition(NULL);
prs->state->state = TPS_Base;
@@ -350,12 +323,9 @@ TParserCopyInit(const TParser *orig)
prs->charmaxlen = orig->charmaxlen;
prs->str = orig->str + orig->state->posbyte;
prs->lenstr = orig->lenstr - orig->state->posbyte;
prs->usewide = orig->usewide;
if (orig->pgwstr)
prs->pgwstr = orig->pgwstr + orig->state->poschar;
if (orig->wstr)
prs->wstr = orig->wstr + orig->state->poschar;
prs->state = newTParserPosition(NULL);
prs->state->state = TPS_Base;
@@ -379,8 +349,6 @@ TParserClose(TParser *prs)
prs->state = ptr;
}
if (prs->wstr)
pfree(prs->wstr);
if (prs->pgwstr)
pfree(prs->pgwstr);
@@ -412,13 +380,9 @@ TParserCopyClose(TParser *prs)
/*
* Character-type support functions, equivalent to is* macros, but
* working with any possible encodings and locales. Notes:
* - with multibyte encoding and C-locale isw* function may fail
* or give wrong result.
* - multibyte encoding and C-locale often are used for
* Asian languages.
* - if locale is C then we use pgwstr instead of wstr.
* Character-type support functions using the database default locale. If the
* locale is C, and the input character is non-ascii, the value to be returned
* is determined by the 'nonascii' macro argument.
*/
#define p_iswhat(type, nonascii) \
@@ -426,19 +390,13 @@ TParserCopyClose(TParser *prs)
static int \
p_is##type(TParser *prs) \
{ \
pg_locale_t locale = pg_database_locale(); \
pg_wchar wc; \
Assert(prs->state); \
if (prs->usewide) \
{ \
if (prs->pgwstr) \
{ \
unsigned int c = *(prs->pgwstr + prs->state->poschar); \
if (c > 0x7f) \
return nonascii; \
return is##type(c); \
} \
return isw##type(*(prs->wstr + prs->state->poschar)); \
} \
return is##type(*(unsigned char *) (prs->str + prs->state->posbyte)); \
wc = prs->pgwstr[prs->state->poschar]; \
if (prs->charmaxlen > 1 && locale->ctype_is_c && wc > 0x7f) \
return nonascii; \
return pg_isw##type(wc, pg_database_locale()); \
} \
\
static int \
@@ -703,7 +661,7 @@ p_isspecial(TParser *prs)
* Check that only in utf encoding, because other encodings aren't
* supported by postgres or even exists.
*/
if (GetDatabaseEncoding() == PG_UTF8 && prs->usewide)
if (GetDatabaseEncoding() == PG_UTF8)
{
static const pg_wchar strange_letter[] = {
/*
@@ -944,10 +902,7 @@ p_isspecial(TParser *prs)
*StopMiddle;
pg_wchar c;
if (prs->pgwstr)
c = *(prs->pgwstr + prs->state->poschar);
else
c = (pg_wchar) *(prs->wstr + prs->state->poschar);
c = *(prs->pgwstr + prs->state->poschar);
while (StopLow < StopHigh)
{