C Tutorial/stdlib.h/mbtowc
mbtowc
Item Value Header file stdlib.h Declaration int mbtowc(wchar_t *out, const char *in, size_t size); Function converts the multibyte character *in into its wide-character equivalent *out. Only size number of characters will be examined. Return returns the number of bytes that are put into *out or -1 or error. If in is null, then mbtowc() returns nonzero if multibyte characters have state-dependent encodings. If they do not, zero is returned.
#include <stdlib.h>
#include <stdio.h>
int main(void){
char *mb = "asdfadsf";
char str[1000];
mbtowc(str, mb, 2);
printf("%s",str);
}