github.com/afumu/libc@v0.0.6/musl/src/multibyte/btowc.c (about)

     1  #include <stdio.h>
     2  #include <wchar.h>
     3  #include <stdlib.h>
     4  #include "internal.h"
     5  
     6  wint_t btowc(int c)
     7  {
     8  	int b = (unsigned char)c;
     9  	return b<128U ? b : (MB_CUR_MAX==1 && c!=EOF) ? CODEUNIT(c) : WEOF;
    10  }