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From: Chip Coldwell <coldwell@redhat.com>
Subject: UNIBYTE_STR_AS_MULTIBYTE_P and UTF-8
Date: Thu, 26 Oct 2006 14:57:01 -0400 (EDT)	[thread overview]
Message-ID: <Pine.LNX.4.64.0610261452501.2371@localhost.localdomain> (raw)


I'm looking at the C macro UNIBYTE_STR_AS_MULTIBYTE_P defined in
src/charset.h, which starts out with this

#define UNIBYTE_STR_AS_MULTIBYTE_P(str, length, bytes)          \
   (((str)[0] < 0x80 || (str)[0] >= 0xA0)                        \
    ? ((bytes) = 1)                                              \
    : /* lots, lots more */

So, if the value at str[0] is less than 0x80 or greater than 0xA0,
this macro returns the value one, and sets "bytes" to one.

That's fine for ASCII (always one byte wide) and ISO-8859-1 (with
special characters between 0xA0 and 0xFF), but what about UTF-8?
There are multibyte characters in UTF-8 with the first byte > 0xA0; it
doesn't seem to me that this macro will work for general UTF-8
strings.

Chip

-- 
Charles M. "Chip" Coldwell
Senior Software Engineer
Red Hat, Inc
978-392-2426

                 reply	other threads:[~2006-10-26 18:57 UTC|newest]

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