C Tutorial/stdlib.h/mbstowcs
mbstowcs
Item Value Header file stdlib.h Declaration size_t mbstowcs(wchar_t *out, const char *in, size_t size); Function converts the multibyte string *in into a wide-character string *out. Only size number of bytes will be stored in out. Return returns the number of multibyte characters converted or -1 on error.
Converts the first four characters in *mb and puts the result in str:
#include <stdlib.h>
#include <stdio.h>
int main(void){
char *mb = "asdfadsf";
char str[1000];
mbstowcs(str, mb, 4);
printf("%s",str);
}