diff options
Diffstat (limited to 'src/backend/utils/adt/pg_locale_libc.c')
| -rw-r--r-- | src/backend/utils/adt/pg_locale_libc.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/backend/utils/adt/pg_locale_libc.c b/src/backend/utils/adt/pg_locale_libc.c index 3baa5816b5f..ab6117aaace 100644 --- a/src/backend/utils/adt/pg_locale_libc.c +++ b/src/backend/utils/adt/pg_locale_libc.c @@ -318,12 +318,41 @@ tolower_libc_mb(pg_wchar wc, pg_locale_t locale) return wc; } +/* + * Characters A..Z always downcase to a..z, even in the Turkish + * locale. Characters beyond 127 use tolower(). + */ +static size_t +downcase_ident_libc_sb(char *dst, size_t dstsize, const char *src, + ssize_t srclen, pg_locale_t locale) +{ + locale_t loc = locale->lt; + int i; + + for (i = 0; i < srclen && i < dstsize; i++) + { + unsigned char ch = (unsigned char) src[i]; + + if (ch >= 'A' && ch <= 'Z') + ch = pg_ascii_tolower(ch); + else if (IS_HIGHBIT_SET(ch) && isupper_l(ch, loc)) + ch = tolower_l(ch, loc); + dst[i] = (char) ch; + } + + if (i < dstsize) + dst[i] = '\0'; + + return srclen; +} + static const struct ctype_methods ctype_methods_libc_sb = { .strlower = strlower_libc_sb, .strtitle = strtitle_libc_sb, .strupper = strupper_libc_sb, /* in libc, casefolding is the same as lowercasing */ .strfold = strlower_libc_sb, + .downcase_ident = downcase_ident_libc_sb, .wc_isdigit = wc_isdigit_libc_sb, .wc_isalpha = wc_isalpha_libc_sb, .wc_isalnum = wc_isalnum_libc_sb, @@ -349,6 +378,8 @@ static const struct ctype_methods ctype_methods_libc_other_mb = { .strupper = strupper_libc_mb, /* in libc, casefolding is the same as lowercasing */ .strfold = strlower_libc_mb, + /* uses plain ASCII semantics for historical reasons */ + .downcase_ident = NULL, .wc_isdigit = wc_isdigit_libc_sb, .wc_isalpha = wc_isalpha_libc_sb, .wc_isalnum = wc_isalnum_libc_sb, @@ -370,6 +401,8 @@ static const struct ctype_methods ctype_methods_libc_utf8 = { .strupper = strupper_libc_mb, /* in libc, casefolding is the same as lowercasing */ .strfold = strlower_libc_mb, + /* uses plain ASCII semantics for historical reasons */ + .downcase_ident = NULL, .wc_isdigit = wc_isdigit_libc_mb, .wc_isalpha = wc_isalpha_libc_mb, .wc_isalnum = wc_isalnum_libc_mb, |