Wide-character to single-byte conversion.
Standard library (libc.a)
#include <stdio.h> #include <wchar.h>
int wctob (wint_t c);
The wctob function determines whether c corresponds to a member of the extended character set whose character representation is a single byte when in the initial shift state.
The behavior of this function is affected by the LC_CTYPE category of the current locale.
The wctob function returns EOF if c does not correspond to a character with length one in the initial shift state. Otherwise, it returns the single-byte representation of that character.
The btowc subroutine.