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more fine-grained Unicode support

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2010-01-29 09:11:47 +01:00
parent 083e172641
commit 2edba21f4c
3 changed files with 146 additions and 21 deletions
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51
Config.in
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@@ -141,6 +141,57 @@ config FEATURE_CHECK_UNICODE_IN_ENV
Otherwise, Unicode support will be always enabled and active.
config SUBST_WCHAR
int "Character code to substitute unprintable characters with"
range 1 4294967295
depends on FEATURE_ASSUME_UNICODE
default 63
help
Typical values are 63 for '?' (works with any output device),
30 for ASCII substitute control code,
65533 (0xfffd) for Unicode replacement character.
config LAST_SUPPORTED_WCHAR
int "Range of supported Unicode characters"
range 0 4294967295
depends on FEATURE_ASSUME_UNICODE
default 767
help
Any character with Unicode value bigger than this is assumed
to be non-printable on output device. Many applets replace
such chars with substitution character.
The idea is that many valid printable Unicode chars are
nevertheless are not displayed correctly. Think about
combining charachers, double-wide hieroglyphs and such.
Many terminals, xterms and such will fail to handle them
correctly.
Typical values are:
126 - ASCII only
767 (0x2ff) - there are no combining chars in [0..767] range
(the range includes Latin 1, Latin Ext. A and B),
code is ~700 bytes smaller for this case.
4351 (0x10ff) - there are no double-wide chars in [0..4351] range,
code is ~300 bytes smaller for this case.
0 - off, any valid printable Unicode character will be printed.
config UNICODE_COMBINING_WCHARS
bool "Allow zero-width Unicode characters on output"
default n
depends on FEATURE_ASSUME_UNICODE
help
With this option off, any Unicode char with width of 0
is substituted on output.
config UNICODE_WIDE_WCHARS
bool "Allow wide Unicode characters on output"
default n
depends on FEATURE_ASSUME_UNICODE
help
With this option off, any Unicode char with width > 1
is substituted on output.
config LONG_OPTS
bool "Support for --long-options"
default y