C166: BYTEALIGN DIRECTIVE

Information in this article applies to:

• C166 Version 4.06

QUESTION

Does the C166 Compiler support pointers to byte-aligned objects?

ANSWER

Yes. This is accomplished with the BYTEALIGN directive.

The BYTEALIGN directive causes the C166 Compiler to generate code that supports structure pointers that may start on byte boundaries. This directive is required when you use the PACK(1) directive.

For example:

#pragma pack(1)     /* byte alignment */
#pragma BYTEALIGN

struct s1  {
  int  i1;       // i1 has offset 0
  char c1;       // c1 has offset 2
  struct s2  {
    int  i2;     // i2 has offset 3
    char c2;     // c2 has offset 5
    int  i3;     // i3 has offset 6
  } s2;
  char z1;       // z1 has offset 8
} s1;

struct s2 *s2p;

void main (void)  {
  s2p = &s1.s2;   // pointer to bytealigned struct
  s2p->i2 = 0;    // access to bytealigned int
}

SEE ALSO

• C166: PACK DIRECTIVE

FORUM THREADS

The following Discussion Forum threads may provide information related to this topic.

• Problem with size of structers

Last Reviewed: Thursday, September 07, 2000