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Re: iconv modules


From: Bruno Haible
Subject: Re: iconv modules
Date: Mon, 4 Sep 2006 15:40:26 +0200
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Oskar Liljeblad wrote:
> it would however be very useful if these functions would
> null-terminate the generated strings properly as well. I assume str_iconv
> and str_cd_iconv would add a single null-byte

Yes. the str_* functions expect a C string as input and produce one as
output, i.e. the from_code and the to_code cannot be UTF-7/16/32.

> but in some cases you'll need 
> two or even four null-bytes - e.g. when converting to UTF-16/UCS-2 and
> UTF-32/UCS-4.

The majority of the cases deal with C strings. UTF-16/32 occur more rarely
than you might think. For this case, and for the case of C strings with
possibly embedded NUL bytes, the function mem_cd_iconv is entirely
sufficient.

> One way would be to simply add four null bytes instead of one 
> all the time, or create another set of functions accepting a
> 'size_t n_null_bytes' argument.

This would work for UTF-16/32, but not for UTF-7.

Bruno




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