The strtows() and wstostr() functions convert strings back and forth between File Code representation and Process Code.
The strtows() function takes a character string src, converts it to a Process Code string, terminated by a Process Code null, and places the result into dst.
The wstostr() function takes the Process Code string pointed to by src, converts it to a character string, and places the result into dst.
The strtows() function returns the Process Code string if it completes successfully. Otherwise, a null pointer will be returned and errno will be set to EILSEQ.
The wstostr() function returns the File Code string if it completes successfully. Otherwise, a null pointer will be returned and errno will be set to EILSEQ.
