Maksim Yevmenkin wrote:
can i use wcstombs(3) to convert a string presented in utf8 into
current locale? basically i'm looking for something like iconv from
ports but included into base system.
This isn't as easy as it should be, unfortunately.
First, UTF-8 is itself a multibyte encoding, so you have
to first convert to wide characters before you can use
wcstombs(). You could in theory use the following:
* Set locale to UTF-8
* use mbstowcs() to convert UTF-8 into wide characters
* Set locale to your preferred locale
* use wcstombs() to convert wide characters to your locale
Besides being ugly, the locale names themselves are not
standardized, so it's hard to do this portably. For a
lot of applications, the error handling in wcstombs() is
also troublesome; it rejects the entire string if any one
character can't be converted.
When I had to do this for libarchive, where the code had
to be very portable (which precluded using iconv), I ended
up doing the following:
* Wrote my own converter from UTF-8 to wide characters
(fortunately, UTF-8 is pretty simple to decode; this
is about 20-30 lines of C)
* Used wctomb() to convert one character at a time from
wide characters to the current locale.
I've found that wctomb() is more portable than a lot of
the other functions (I think it's in C89, whereas a lot
of the other standard conversion routines were introduced
in C99) and provides better error-handling capabilities
since it operates on one character at a time (so you
can, for instance, convert characters that aren't
supported in the current locale into '?' or some kind
of \-escape).
Feel free to copy any of my code from libarchive if it helps.
Tim
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