_CP_fold is equivalent to the result = fold(string1, string2, string3) BASIC statement.
int _CP_fold(CPSTR** result, CPSTR* string1, CPSTR* string2, CPSTR* string3)
This function returns -1 if an error occurs. The error code is contained in _CP_errno.
/* Prints "A|long|strin|g" */ CPSTR * s = _CP_mkstr("A long string"); CPSTR * t = _CP_mkstr("5"); CPSTR * u = _CP_mkstr("|"); _CP_fold(&s,s,t,u); _CP_print(s);