The MALLOC_C_STR function  takes  a  Pascal  string  expression,
  calls the C routine malloc() to allocate memory, initializes the
  memory with the  string  expression,  and  then  terminates  the
  string with a null-charcter.

  Syntax:

     MALLOC_C_STR(e)

  The type of the expression e must be a Pascal string expression.
  The  function  result is a C_STR_T pointer to the null-terminted
  string.  The amount of memory allocated with malloc()  is  equal
  to  the  length  of  the string expression plus one.  The memory
  allocated with MALLOC_C_STR  must  be  deallocated  with  the  C
  free()  routine.  The compiler will not allow C_STR_T parameters
  with the NEW and DISPOSE routines.