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Fix pg_iswcased() for some libc case mappings.

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Some C libraries, such as macOS libc, case-map characters that they do
not classify as upper or lower.  ILIKE index scans could then miss
rows, because those characters stayed in the fixed prefix.

Introduced in 630706ced0. 43a948b7b2 fixed similar issues, but missed
this one.

Author: shihao zhong <zhong950419@gmail.com>
Reviewed-by: Fujii Masao <masao.fujii@gmail.com>
Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Discussion: https://postgr.es/m/CAGRkXqS6pr-hG-g=K6RTdRw53SnMZWz3iXvh_wi8rqLSf972sA@mail.gmail.com
Backpatch-through: 19
This commit is contained in:
Jeff Davis
2026-10-26 15:11:21 -07:00
parent 1dc45adefa
commit 8474bae2ba
1 changed files with 6 additions and 2 deletions
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8
src/backend/utils/adt/pg_locale_libc.c
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@@ -328,10 +328,14 @@ wc_iscased_libc_utf8(pg_wchar wc, pg_locale_t locale)
/*
* For UTF8, pg_wchar is a codepoint and we assume we can pass it directly
* to iswupper_l()/iswlower_l().
* to iswupper_l()/iswlower_l(). Some C libraries case-map characters
* that they do not classify as upper or lower, so also check the mapping,
* which is what ILIKE uses.
*/
return iswupper_l((wint_t) wc, locale->lt) ||
iswlower_l((wint_t) wc, locale->lt);
iswlower_l((wint_t) wc, locale->lt) ||
towupper_l((wint_t) wc, locale->lt) != (wint_t) wc ||
towlower_l((wint_t) wc, locale->lt) != (wint_t) wc;
}
static pg_wchar