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Refactor to add pg_strcoll(), pg_strxfrm(), and variants.

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Offers a generally better separation of responsibilities for collation
code. Also, a step towards multi-lib ICU, which should be based on a
clean separation of the routines required for collation providers.

Callers with NUL-terminated strings should call pg_strcoll() or
pg_strxfrm(); callers with strings and their length should call the
variants pg_strncoll() or pg_strnxfrm().

Reviewed-by: Peter Eisentraut, Peter Geoghegan
Discussion: https://postgr.es/m/a581136455c940d7bd0ff482d3a2bd51af25a94f.camel%40j-davis.com
This commit is contained in:
Jeff Davis
2023-02-23 10:55:20 -08:00
parent e9960732a9
commit d87d548cd0
5 changed files with 870 additions and 390 deletions
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13
src/include/utils/pg_locale.h
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@@ -100,6 +100,19 @@ extern void make_icu_collator(const char *iculocstr,
extern pg_locale_t pg_newlocale_from_collation(Oid collid);
extern char *get_collation_actual_version(char collprovider, const char *collcollate);
extern int pg_strcoll(const char *arg1, const char *arg2, pg_locale_t locale);
extern int pg_strncoll(const char *arg1, size_t len1,
const char *arg2, size_t len2, pg_locale_t locale);
extern bool pg_strxfrm_enabled(pg_locale_t locale);
extern size_t pg_strxfrm(char *dest, const char *src, size_t destsize,
pg_locale_t locale);
extern size_t pg_strnxfrm(char *dest, size_t destsize, const char *src,
size_t srclen, pg_locale_t locale);
extern bool pg_strxfrm_prefix_enabled(pg_locale_t locale);
extern size_t pg_strxfrm_prefix(char *dest, const char *src, size_t destsize,
pg_locale_t locale);
extern size_t pg_strnxfrm_prefix(char *dest, size_t destsize, const char *src,
size_t srclen, pg_locale_t locale);
#ifdef USE_ICU
extern int32_t icu_to_uchar(UChar **buff_uchar, const char *buff, size_t nbytes);