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Refactor string case conversion into provider-specific files.

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Create API entry points pg_strlower(), etc., that work with any
provider and give the caller control over the destination
buffer. Then, move provider-specific logic into pg_locale_builtin.c,
pg_locale_icu.c, and pg_locale_libc.c as appropriate.

Discussion: https://postgr.es/m/7aa46d77b377428058403723440862d12a8a129a.camel@j-davis.com
This commit is contained in:
Jeff Davis
2024-12-16 09:35:18 -08:00
parent de1e298857
commit 86a5d6006a
6 changed files with 676 additions and 418 deletions
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14
src/include/utils/pg_locale.h
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@@ -93,6 +93,15 @@ extern void init_database_collation(void);
extern pg_locale_t pg_newlocale_from_collation(Oid collid);
extern char *get_collation_actual_version(char collprovider, const char *collcollate);
extern size_t pg_strlower(char *dest, size_t destsize,
const char *src, ssize_t srclen,
pg_locale_t locale);
extern size_t pg_strtitle(char *dest, size_t destsize,
const char *src, ssize_t srclen,
pg_locale_t locale);
extern size_t pg_strupper(char *dest, size_t destsize,
const char *src, ssize_t srclen,
pg_locale_t locale);
extern int pg_strcoll(const char *arg1, const char *arg2, pg_locale_t locale);
extern int pg_strncoll(const char *arg1, ssize_t len1,
const char *arg2, ssize_t len2, pg_locale_t locale);
@@ -112,11 +121,6 @@ extern const char *builtin_validate_locale(int encoding, const char *locale);
extern void icu_validate_locale(const char *loc_str);
extern char *icu_language_tag(const char *loc_str, int elevel);
#ifdef USE_ICU
extern int32_t icu_to_uchar(UChar **buff_uchar, const char *buff, size_t nbytes);
extern int32_t icu_from_uchar(char **result, const UChar *buff_uchar, int32_t len_uchar);
#endif
/* These functions convert from/to libc's wchar_t, *not* pg_wchar_t */
extern size_t wchar2char(char *to, const wchar_t *from, size_t tolen,
pg_locale_t locale);