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/*-----------------------------------------------------------------------
*
* PostgreSQL locale utilities for builtin provider
*
* Portions Copyright (c) 2002-2025, PostgreSQL Global Development Group
*
* src/backend/utils/adt/pg_locale_builtin.c
*
*-----------------------------------------------------------------------
*/
#include "postgres.h"
#include "catalog/pg_database.h"
#include "catalog/pg_collation.h"
#include "common/unicode_case.h"
#include "common/unicode_category.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "utils/builtins.h"
#include "utils/memutils.h"
#include "utils/pg_locale.h"
#include "utils/syscache.h"
extern pg_locale_t create_pg_locale_builtin(Oid collid,
MemoryContext context);
extern size_t strlower_builtin(char *dst, size_t dstsize, const char *src,
ssize_t srclen, pg_locale_t locale);
extern size_t strtitle_builtin(char *dst, size_t dstsize, const char *src,
ssize_t srclen, pg_locale_t locale);
extern size_t strupper_builtin(char *dst, size_t dstsize, const char *src,
ssize_t srclen, pg_locale_t locale);
struct WordBoundaryState
{
const char *str;
size_t len;
size_t offset;
bool init;
bool prev_alnum;
};
/*
* Simple word boundary iterator that draws boundaries each time the result of
* pg_u_isalnum() changes.
*/
static size_t
initcap_wbnext(void *state)
{
struct WordBoundaryState *wbstate = (struct WordBoundaryState *) state;
while (wbstate->offset < wbstate->len &&
wbstate->str[wbstate->offset] != '\0')
{
pg_wchar u = utf8_to_unicode((unsigned char *) wbstate->str +
wbstate->offset);
bool curr_alnum = pg_u_isalnum(u, true);
if (!wbstate->init || curr_alnum != wbstate->prev_alnum)
{
size_t prev_offset = wbstate->offset;
wbstate->init = true;
wbstate->offset += unicode_utf8len(u);
wbstate->prev_alnum = curr_alnum;
return prev_offset;
}
wbstate->offset += unicode_utf8len(u);
}
return wbstate->len;
}
size_t
strlower_builtin(char *dest, size_t destsize, const char *src, ssize_t srclen,
pg_locale_t locale)
{
return unicode_strlower(dest, destsize, src, srclen);
}
size_t
strtitle_builtin(char *dest, size_t destsize, const char *src, ssize_t srclen,
pg_locale_t locale)
{
struct WordBoundaryState wbstate = {
.str = src,
.len = srclen,
.offset = 0,
.init = false,
.prev_alnum = false,
};
return unicode_strtitle(dest, destsize, src, srclen,
initcap_wbnext, &wbstate);
}
size_t
strupper_builtin(char *dest, size_t destsize, const char *src, ssize_t srclen,
pg_locale_t locale)
{
return unicode_strupper(dest, destsize, src, srclen);
}
pg_locale_t
create_pg_locale_builtin(Oid collid, MemoryContext context)
{
const char *locstr;
pg_locale_t result;
if (collid == DEFAULT_COLLATION_OID)
{
HeapTuple tp;
Datum datum;
tp = SearchSysCache1(DATABASEOID, ObjectIdGetDatum(MyDatabaseId));
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for database %u", MyDatabaseId);
datum = SysCacheGetAttrNotNull(DATABASEOID, tp,
Anum_pg_database_datlocale);
locstr = TextDatumGetCString(datum);
ReleaseSysCache(tp);
}
else
{
HeapTuple tp;
Datum datum;
tp = SearchSysCache1(COLLOID, ObjectIdGetDatum(collid));
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for collation %u", collid);
datum = SysCacheGetAttrNotNull(COLLOID, tp,
Anum_pg_collation_colllocale);
locstr = TextDatumGetCString(datum);
ReleaseSysCache(tp);
}
builtin_validate_locale(GetDatabaseEncoding(), locstr);
result = MemoryContextAllocZero(context, sizeof(struct pg_locale_struct));
result->info.builtin.locale = MemoryContextStrdup(context, locstr);
result->provider = COLLPROVIDER_BUILTIN;
result->deterministic = true;
result->collate_is_c = true;
result->ctype_is_c = (strcmp(locstr, "C") == 0);
return result;
}
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