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`mbstowcs'--minimal multibyte string to wide char converter

     #include <stdlib.h>
     int mbstowcs(wchar_t *PWC, const char *S, size_t N);
When MB_CAPABLE is not defined, this is a minimal ANSI-conforming
implementation of `mbstowcs'.  In this case, the only "multi-byte
character sequences" recognized are single bytes, and they are
"converted" to wide-char versions simply by byte extension.
   When MB_CAPABLE is defined, this routine calls `_mbstowcs_r' to
perform the conversion, passing a state variable to allow state
dependent decoding.  The result is based on the locale setting which may
be restricted to a defined set of locales.
This implementation of `mbstowcs' returns `0' if S is `NULL' or is the
empty string; it returns `-1' if MB_CAPABLE and one of the multi-byte
characters is invalid or incomplete; otherwise it returns the minimum
of: `n' or the number of multi-byte characters in `s' plus 1 (to
compensate for the nul character).  If the return value is -1, the
state of the `pwc' string is indeterminate.  If the input has a length
of 0, the output string will be modified to contain a wchar_t nul
`mbstowcs' is required in the ANSI C standard.  However, the precise
effects vary with the locale.
   `mbstowcs' requires no supporting OS subroutines.