wctomb—minimal wide char to multibyte converter #include <stdlib.h>
int wctomb(char *s, wchar_t wchar);
Description
When _MB_CAPABLE is not defined, this is a minimal ANSI-conforming
implementation of wctomb. The
only “wide characters” recognized are single bytes,
and they are “converted” to themselves.
When _MB_CAPABLE is defined, this routine calls _wctomb_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.
Each call to wctomb modifies *s unless s is a null
pointer or _MB_CAPABLE is defined and wchar is invalid.
Returns
wctomb returns 0 if
s is NULL; it returns -1 if _MB_CAPABLE is enabled
and the wchar is not a valid multi-byte character, it returns 1
if _MB_CAPABLE is not defined or the wchar is in reality a single
byte character, otherwise it returns the number of bytes in the
multi-byte character.
Portability
wctomb is required in the ANSI C standard. However, the precise
effects vary with the locale.
wctomb requires no supporting OS subroutines.