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tuklib_mbstr_width: Change the behavior when wcwidth() is not available 

If wcwidth() isn't available (Windows), previously it was assumed
that one byte == one column in the terminal. Now it is assumed that
one multibyte character == one column. This works better with UTF-8.
Languages that only use single-width characters without any combining
characters should work correctly with this.

In xz, none of po/*.po contain combining characters and only ko.po,
zh_CN.po, and zh_TW.po contain fullwidth characters. Thus, "only"
those three translations in xz are broken on Windows with the
UTF-8 code page. Broken means that column headings in xz -lvv and
(only in the master branch) strings in --long-help are misaligned,
so it's not a huge problem. I don't know if those three languages
displayed perfectly before the UTF-8 change because I hadn't tested
translations with native Windows builds before.

Fixes: 46ee006162
(cherry picked from commit b797c44c42)
This commit is contained in:
Lasse Collin 2024-12-16 20:06:07 +02:00
parent 4ff609adb0
commit 4e0ebbabe4
No known key found for this signature in database
GPG Key ID: 38EE757D69184620
1 changed files with 11 additions and 2 deletions
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13
src/common/tuklib_mbstr_width.c
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@ -12,7 +12,7 @@
#include "tuklib_mbstr.h"
#include <string.h>
#if defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
#ifdef HAVE_MBRTOWC
# include <wchar.h>
#endif
@ -24,7 +24,7 @@ tuklib_mbstr_width(const char *str, size_t *bytes)
if (bytes != NULL)
*bytes = len;
#if !(defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH))
#ifndef HAVE_MBRTOWC
// In single-byte mode, the width of the string is the same
// as its length.
return len;
@ -46,11 +46,20 @@ tuklib_mbstr_width(const char *str, size_t *bytes)
i += ret;
#ifdef HAVE_WCWIDTH
const int wc_width = wcwidth(wc);
if (wc_width < 0)
return (size_t)-1;
width += (size_t)wc_width;
#else
// Without wcwidth() (like in a native Windows build),
// assume that one multibyte char == one column. With
// UTF-8, this is less bad than one byte == one column.
// This way quite a few languages will be handled correctly
// in practice; CJK chars will be very wrong though.
++width;
#endif
}
// Require that the string ends in the initial shift state.