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Cygwin: is_unicode_equiv: fix normalization 

Change normalization to form KD and make room for longer
decomposed sequences.
This commit is contained in:
Corinna Vinschen 2023-02-18 23:14:11 +01:00
parent e4cc9e4846
commit f0417a6201
1 changed files with 9 additions and 7 deletions
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16
winsup/cygwin/nlsfuncs.cc
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@ -1200,14 +1200,14 @@ __collate_range_cmp (int c1, int c2)
Note that we only recognize input in Unicode normalization form C, that
is, we expect all letters to be composed. A single character is all we
look at.
To check equivalence, decompose pattern letter and input letter and check
the base character for equality. Also, convert all digits to the ASCII
digits 0 - 9 and compare. */
To check equivalence, decompose pattern letter and input letter into
normalization form KD and check the base character for equality. Also,
convert all digits to the ASCII digits 0 - 9 and compare. */
extern "C" int
is_unicode_equiv (wint_t test, wint_t eqv)
{
wchar_t decomp_testc[5] = { 0 };
wchar_t decomp_eqvc[5] = { 0 };
wchar_t decomp_testc[24] = { 0 };
wchar_t decomp_eqvc[24] = { 0 };
wchar_t testc[3] = { 0 };
wchar_t eqvc[3] = { 0 };
@ -1229,8 +1229,10 @@ is_unicode_equiv (wint_t test, wint_t eqv)
} else
testc[0] = test;
/* Convert to denormalized form */
FoldStringW (MAP_COMPOSITE | MAP_FOLDDIGITS, eqvc, -1, decomp_eqvc, 5);
FoldStringW (MAP_COMPOSITE | MAP_FOLDDIGITS, testc, -1, decomp_testc, 5);
FoldStringW (MAP_COMPOSITE | MAP_FOLDCZONE | MAP_FOLDDIGITS,
eqvc, -1, decomp_eqvc, 24);
FoldStringW (MAP_COMPOSITE | MAP_FOLDCZONE | MAP_FOLDDIGITS,
testc, -1, decomp_testc, 24);
/* If they are equivalent, the base char must be the same. */
if (decomp_eqvc[0] != decomp_testc[0])
return 0;