diff options
Diffstat (limited to 'src/backend/utils/adt/pg_locale_icu.c')
| -rw-r--r-- | src/backend/utils/adt/pg_locale_icu.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/src/backend/utils/adt/pg_locale_icu.c b/src/backend/utils/adt/pg_locale_icu.c index 5185b0f7289..b0c73f2e43d 100644 --- a/src/backend/utils/adt/pg_locale_icu.c +++ b/src/backend/utils/adt/pg_locale_icu.c @@ -54,6 +54,8 @@ extern size_t strtitle_icu(char *dst, size_t dstsize, const char *src, ssize_t srclen, pg_locale_t locale); extern size_t strupper_icu(char *dst, size_t dstsize, const char *src, ssize_t srclen, pg_locale_t locale); +extern size_t strfold_icu(char *dst, size_t dstsize, const char *src, + ssize_t srclen, pg_locale_t locale); #ifdef USE_ICU @@ -117,6 +119,10 @@ static int32_t u_strToTitle_default_BI(UChar *dest, int32_t destCapacity, const UChar *src, int32_t srcLength, const char *locale, UErrorCode *pErrorCode); +static int32_t u_strFoldCase_default(UChar *dest, int32_t destCapacity, + const UChar *src, int32_t srcLength, + const char *locale, + UErrorCode *pErrorCode); static const struct collate_methods collate_methods_icu = { .strncoll = strncoll_icu, @@ -439,6 +445,26 @@ strupper_icu(char *dest, size_t destsize, const char *src, ssize_t srclen, return result_len; } +size_t +strfold_icu(char *dest, size_t destsize, const char *src, ssize_t srclen, + pg_locale_t locale) +{ + int32_t len_uchar; + int32_t len_conv; + UChar *buff_uchar; + UChar *buff_conv; + size_t result_len; + + len_uchar = icu_to_uchar(&buff_uchar, src, srclen); + len_conv = icu_convert_case(u_strFoldCase_default, locale, + &buff_conv, buff_uchar, len_uchar); + result_len = icu_from_uchar(dest, destsize, buff_conv, len_conv); + pfree(buff_uchar); + pfree(buff_conv); + + return result_len; +} + /* * strncoll_icu_utf8 * @@ -673,6 +699,38 @@ u_strToTitle_default_BI(UChar *dest, int32_t destCapacity, NULL, locale, pErrorCode); } +static int32_t +u_strFoldCase_default(UChar *dest, int32_t destCapacity, + const UChar *src, int32_t srcLength, + const char *locale, + UErrorCode *pErrorCode) +{ + uint32 options = U_FOLD_CASE_DEFAULT; + char lang[3]; + UErrorCode status; + + /* + * Unlike the ICU APIs for lowercasing, titlecasing, and uppercasing, case + * folding does not accept a locale. Instead it just supports a single + * option relevant to Turkic languages 'az' and 'tr'; check for those + * languages to enable the option. + */ + status = U_ZERO_ERROR; + uloc_getLanguage(locale, lang, 3, &status); + if (U_SUCCESS(status)) + { + /* + * The option name is confusing, but it causes u_strFoldCase to use + * the 'T' mappings, which are ignored for U_FOLD_CASE_DEFAULT. + */ + if (strcmp(lang, "tr") == 0 || strcmp(lang, "az") == 0) + options = U_FOLD_CASE_EXCLUDE_SPECIAL_I; + } + + return u_strFoldCase(dest, destCapacity, src, srcLength, + options, pErrorCode); +} + /* * strncoll_icu * |