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Re: Case mapping of sharp s

From: Andreas Schwab
Subject: Re: Case mapping of sharp s
Date: Sat, 21 Nov 2009 10:33:47 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux)

Eli Zaretskii <address@hidden> writes:

> CHAR_TO_BYTE could be expensive, yes.  But how else can you convert an
> arbitrary character position to the corresponding byte position?  When
> you scan forward, you know the byte length of a multi-byte UTF-8
> sequence by the first byte, but what do you do when you scan backwards?

The first byte of a UTF-8 sequence is easily recognizable, so finding
out the length of the previous UTF-8 sequence is nearly as easy (see


Andreas Schwab, address@hidden
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