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@node mbstowcs
@section @code{mbstowcs}
@findex mbstowcs
POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/mbstowcs.html}
Gnulib module: mbstowcs
Portability problems fixed by Gnulib:
@itemize
@item
In the C or POSIX locales, this function can return @code{(size_t) -1}
and set @code{errno} to @code{EILSEQ}:
glibc 2.35.
@end itemize
Portability problems not fixed by Gnulib:
@itemize
@item
On Windows and 32-bit AIX platforms, @code{wchar_t} is a 16-bit type and
therefore cannot accommodate all Unicode characters.
However, the Gnulib function @code{mbstoc32s}, provided by Gnulib module
@code{mbstoc32s}, operates on 32-bit wide characters and therefore does not
have this limitation.
@end itemize
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