Re: Case mapping of sharp s

[Andreas Schwab]

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
DEC_POS).

Andreas.

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Andreas Schwab, address@hidden
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