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localedata: add some exceptions to utf8proc widths

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Hangul Jamo medial vowels and final consonants are reportedly combining
characters that won't take up any columns on their own and should be
reported as zero-width, so add an exception for these as well to reflect
how they work in practice.  This conforms to how other implementations
(e.g., glibc) treat these characters.

Reviewed by:	bapt (earlier version), jkim
Sponsored by:	Klara, Inc.
Differential Revision:	https://reviews.freebsd.org/D47472
This commit is contained in:
Kyle Evans 2024-11-13 16:12:42 -06:00
parent a4b7367eb0
commit 160c36eae4
1 changed files with 17 additions and 1 deletions
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18
tools/tools/locale/tools/getwidths.c
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@ -28,6 +28,21 @@
#include <utf8proc.h>
static int
width_of(int32_t wc)
{
/*
* Hangul Jamo medial vowels and final consonants are more of
* a combining character, and should be considered zero-width.
*/
if (wc >= 0x1160 && wc <= 0x11ff)
return (0);
/* No override by default, trust utf8proc's width. */
return (utf8proc_charwidth(wc));
}
int
main(void)
{
@ -43,9 +58,10 @@ main(void)
wcc = utf8proc_category(wc);
if (wcc == UTF8PROC_CATEGORY_CC)
continue;
wcw = utf8proc_charwidth(wc);
wcw = width_of(wc);
if (wcw == 1)
continue;
printf("%04X %d\n", wc, wcw);
}