wctomb dumps core on invalid input

[Ulrich Drepper]

Bruno Haible <haible@ilog.fr> writes:

> According to SUSV2, "wctomb() returns -1 if the value of wchar does not
> correspond to a valid character". This is not what glibc 2.2 does. Here
> is a test program.
> 
> ===========================================
> #include <wchar.h>
> #include <locale.h>
> 
> int main ()
> {
>   char buf[10];
>   wchar_t wc = 0xdeadbeef;

There's a difference.  The standard text refers to the character in
the multibyte encoding.  If there is no equivalent to the wide
character -1 is returned.

A value like 0xdeadbeef for a wchar_t is completely impossible to get
since no module can produce it.  The assumption that values of wchar_t
are <= 0x7fffffff must always be met.

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