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#include <stdio.h>

#include <stdlib.h>

#include <string.h>

/**************************************************************************

 * TESTS :

 * function returning large structures, which go on the stack

 * functions returning varied sized structs which go on in the registers.

 ***************************************************************************/

/* A large structure (> 64 bits) used to test passing large structures as

 * parameters

 */

struct array_rep_info_t {

   int   next_index[10];

   int   values[10];

   int   head;

};

/*****************************************************************************

 * Small structures ( <= 64 bits). These are used to test passing small

 * structures as parameters and test argument size promotion.

 *****************************************************************************/

 /* 64 bits

  */

struct small_rep_info_t {

   int   value;

   int   head;

};

/* 6 bits : really fits in 8 bits and is promoted to 32 bits

 */

struct bit_flags_t {

       unsigned alpha   :1;

       unsigned beta    :1;

       unsigned gamma   :1;

       unsigned delta   :1;

       unsigned epsilon :1;

       unsigned omega   :1;

};

/* 22 bits : really fits in 40 bits and is promoted to 64 bits

 */

struct bit_flags_combo_t {

       unsigned alpha   :1;

       unsigned beta    :1;

       char     ch1;

       unsigned gamma   :1;

       unsigned delta   :1;

       char     ch2;

       unsigned epsilon :1;

       unsigned omega   :1;

};

/* 64 bits

 */

struct one_double_t {

       double double1;

};

/* 64 bits

 */

struct two_floats_t {

       float float1;

       float float2;

};

/* 24 bits : promoted to 32 bits

 */

struct three_char_t {

       char ch1;

       char ch2;

       char ch3;

};

/* 40 bits : promoted to 64 bits

 */

struct five_char_t {

       char ch1;

       char ch2;

       char ch3;

       char ch4;

       char ch5;

};

/* 40 bits : promoted to 64 bits

 */

struct int_char_combo_t {

       int  int1;

       char ch1;

};

/*****************************************************************

 * LOOP_COUNT :

 * A do nothing function. Used to provide a point at which calls can be made.

 *****************************************************************/

void loop_count () {

     int index;

     for (index=0; index<4; index++);

}

/*****************************************************************

 * INIT_BIT_FLAGS :

 * Initializes a bit_flags_t structure. Can call this function see

 * the call command behavior when integer arguments do not fit into

 * registers and must be placed on the stack.

 * OUT struct bit_flags_t *bit_flags -- structure to be filled

 * IN  unsigned a  -- 0 or 1

 * IN  unsigned b  -- 0 or 1

 * IN  unsigned g  -- 0 or 1

 * IN  unsigned d  -- 0 or 1

 * IN  unsigned e  -- 0 or 1

 * IN  unsigned o  -- 0 or 1

 *****************************************************************/

#ifdef PROTOTYPES

void init_bit_flags (

struct bit_flags_t *bit_flags,

unsigned a,

unsigned b,

unsigned g,

unsigned d,

unsigned e,

unsigned o)

#else

void init_bit_flags (bit_flags,a,b,g,d,e,o)

struct bit_flags_t *bit_flags;

unsigned a;

unsigned b;

unsigned g;

unsigned d;

unsigned e;

unsigned o;

#endif

{

   bit_flags->alpha = a;

   bit_flags->beta = b;

   bit_flags->gamma = g;

   bit_flags->delta = d;

   bit_flags->epsilon = e;

   bit_flags->omega = o;

}

/*****************************************************************

 * INIT_BIT_FLAGS_COMBO :

 * Initializes a bit_flags_combo_t structure. Can call this function

 * to see the call command behavior when integer and character arguments

 * do not fit into registers and must be placed on the stack.

 * OUT struct bit_flags_combo_t *bit_flags_combo -- structure to fill

 * IN  unsigned a  -- 0 or 1

 * IN  unsigned b  -- 0 or 1

 * IN  char     ch1

 * IN  unsigned g  -- 0 or 1

 * IN  unsigned d  -- 0 or 1

 * IN  char     ch2

 * IN  unsigned e  -- 0 or 1

 * IN  unsigned o  -- 0 or 1

 *****************************************************************/

#ifdef PROTOTYPES

void init_bit_flags_combo (

struct bit_flags_combo_t *bit_flags_combo,

unsigned a,

unsigned b,

char ch1,

unsigned g,

unsigned d,

char ch2,

unsigned e,

unsigned o)

#else

void init_bit_flags_combo (bit_flags_combo, a, b, ch1, g, d, ch2, e, o)

struct bit_flags_combo_t *bit_flags_combo;

unsigned a;

unsigned b;

char ch1;

unsigned g;

unsigned d;

char ch2;

unsigned e;

unsigned o;

#endif

{

   bit_flags_combo->alpha = a;

   bit_flags_combo->beta = b;

   bit_flags_combo->ch1 = ch1;

   bit_flags_combo->gamma = g;

   bit_flags_combo->delta = d;

   bit_flags_combo->ch2 = ch2;

   bit_flags_combo->epsilon = e;

   bit_flags_combo->omega = o;

}

/*****************************************************************

 * INIT_ONE_DOUBLE :

 * OUT  struct one_double_t *one_double  -- structure to fill

 * IN   double init_val

 *****************************************************************/

#ifdef PROTOTYPES

void init_one_double ( struct one_double_t *one_double, double init_val)

#else

void init_one_double (one_double, init_val)

struct one_double_t *one_double;

double init_val;

#endif

{

     one_double->double1  = init_val;

}

/*****************************************************************

 * INIT_TWO_FLOATS :

 * OUT struct two_floats_t *two_floats -- structure to be filled

 * IN  float init_val1

 * IN  float init_val2

 *****************************************************************/

#ifdef PROTOTYPES

void init_two_floats (

     struct two_floats_t *two_floats,

     float init_val1,

     float init_val2)

#else

void init_two_floats (two_floats, init_val1, init_val2)

struct two_floats_t *two_floats;

float init_val1;

float init_val2;

#endif

{

     two_floats->float1 = init_val1;

     two_floats->float2 = init_val2;

}

/*****************************************************************

 * INIT_THREE_CHARS :

 * OUT struct three_char_t *three_char -- structure to be filled

 * IN  char init_val1

 * IN  char init_val2

 * IN  char init_val3

 *****************************************************************/

#ifdef PROTOTYPES

void init_three_chars (

struct three_char_t *three_char,

char init_val1,

char init_val2,

char init_val3)

#else

void init_three_chars ( three_char, init_val1, init_val2, init_val3)

struct three_char_t *three_char;

char init_val1;

char init_val2;

char init_val3;

#endif

{

     three_char->ch1 = init_val1;

     three_char->ch2 = init_val2;

     three_char->ch3 = init_val3;

}

/*****************************************************************

 * INIT_FIVE_CHARS :

 * OUT struct five_char_t *five_char -- structure to be filled

 * IN  char init_val1

 * IN  char init_val2

 * IN  char init_val3

 * IN  char init_val4

 * IN  char init_val5

 *****************************************************************/

#ifdef PROTOTYPES

void init_five_chars (

struct five_char_t *five_char,

char init_val1,

char init_val2,

char init_val3,

char init_val4,

char init_val5)

#else

void init_five_chars ( five_char, init_val1, init_val2, init_val3, init_val4, init_val5)

struct five_char_t *five_char;

char init_val1;

char init_val2;

char init_val3;

char init_val4;

char init_val5;

#endif

{

     five_char->ch1 = init_val1;

     five_char->ch2 = init_val2;

     five_char->ch3 = init_val3;

     five_char->ch4 = init_val4;

     five_char->ch5 = init_val5;

}

/*****************************************************************

 * INIT_INT_CHAR_COMBO :

 * OUT struct int_char_combo_t *combo -- structure to be filled

 * IN  int  init_val1

 * IN  char init_val2

 *****************************************************************/

#ifdef PROTOTYPES

void init_int_char_combo (

struct int_char_combo_t *combo,

int init_val1,

char init_val2)

#else

void init_int_char_combo ( combo, init_val1, init_val2)

struct int_char_combo_t *combo;

int init_val1;

char init_val2;

#endif

{

     combo->int1 = init_val1;

     combo->ch1 = init_val2;

}

/*****************************************************************

 * INIT_STRUCT_REP :

 * OUT struct small_rep_into_t *small_struct -- structure to be filled

 * IN  int  seed

 *****************************************************************/

#ifdef PROTOTYPES

void init_struct_rep(

     struct small_rep_info_t *small_struct,

     int seed)

#else

void init_struct_rep( small_struct, seed)

struct small_rep_info_t *small_struct;

int    seed;

#endif

{

      small_struct->value = 2 + (seed*2);

      small_struct->head = 0;

}

/*****************************************************************

 * PRINT_BIT_FLAGS :

 * IN struct bit_flags_t bit_flags

 ****************************************************************/

#ifdef PROTOTYPES

struct bit_flags_t print_bit_flags (struct bit_flags_t bit_flags)

#else

struct bit_flags_t print_bit_flags ( bit_flags)

struct bit_flags_t bit_flags;

#endif

{

     if (bit_flags.alpha) printf("alpha\n");

     if (bit_flags.beta) printf("beta\n");

     if (bit_flags.gamma) printf("gamma\n");

     if (bit_flags.delta) printf("delta\n");

     if (bit_flags.epsilon) printf("epsilon\n");

     if (bit_flags.omega) printf("omega\n");

     return bit_flags;

}

/*****************************************************************

 * PRINT_BIT_FLAGS_COMBO :

 * IN struct bit_flags_combo_t bit_flags_combo

 ****************************************************************/

#ifdef PROTOTYPES

struct bit_flags_combo_t print_bit_flags_combo (struct bit_flags_combo_t bit_flags_combo)

#else

struct bit_flags_combo_t print_bit_flags_combo ( bit_flags_combo )

struct bit_flags_combo_t bit_flags_combo;

#endif

{

     if (bit_flags_combo.alpha) printf("alpha\n");

     if (bit_flags_combo.beta) printf("beta\n");

     if (bit_flags_combo.gamma) printf("gamma\n");

     if (bit_flags_combo.delta) printf("delta\n");

     if (bit_flags_combo.epsilon) printf("epsilon\n");

     if (bit_flags_combo.omega) printf("omega\n");

     printf("ch1: %c\tch2: %c\n", bit_flags_combo.ch1, bit_flags_combo.ch2);

     return bit_flags_combo;

}

/*****************************************************************

 * PRINT_ONE_DOUBLE :

 * IN struct one_double_t one_double

 ****************************************************************/

#ifdef PROTOTYPES

struct one_double_t print_one_double (struct one_double_t one_double)

#else

struct one_double_t print_one_double ( one_double )

struct one_double_t one_double;

#endif

{

     printf("Contents of one_double_t: \n\n");

     printf("%f\n", one_double.double1);

     return one_double;

}

/*****************************************************************

 * PRINT_TWO_FLOATS :

 * IN struct two_floats_t two_floats

 ****************************************************************/

#ifdef PROTOTYPES

struct two_floats_t print_two_floats (struct two_floats_t two_floats)

#else

struct two_floats_t print_two_floats ( two_floats )

struct two_floats_t two_floats;

#endif

{

     printf("Contents of two_floats_t: \n\n");

     printf("%f\t%f\n", two_floats.float1, two_floats.float2);

     return two_floats;

}

/*****************************************************************

 * PRINT_THREE_CHARS :

 * IN struct three_char_t three_char

 ****************************************************************/

#ifdef PROTOTYPES

struct three_char_t print_three_chars (struct three_char_t three_char)

#else

struct three_char_t print_three_chars ( three_char )

struct three_char_t three_char;

#endif

{

     printf("Contents of three_char_t: \n\n");

     printf("%c\t%c\t%c\n", three_char.ch1, three_char.ch2, three_char.ch3);

     return three_char;

}

/*****************************************************************

 * PRINT_FIVE_CHARS :

 * IN struct five_char_t five_char

 ****************************************************************/

#ifdef PROTOTYPES

struct five_char_t print_five_chars (struct five_char_t five_char)

#else

struct five_char_t print_five_chars ( five_char )

struct five_char_t five_char;

#endif

{

     printf("Contents of five_char_t: \n\n");

     printf("%c\t%c\t%c\t%c\t%c\n", five_char.ch1, five_char.ch2,

                                    five_char.ch3, five_char.ch4,

                                    five_char.ch5);

     return five_char;

}

/*****************************************************************

 * PRINT_INT_CHAR_COMBO :

 * IN struct int_char_combo_t int_char_combo

 ****************************************************************/

#ifdef PROTOTYPES

struct int_char_combo_t print_int_char_combo (struct int_char_combo_t int_char_combo)

#else

struct int_char_combo_t print_int_char_combo ( int_char_combo )

struct int_char_combo_t int_char_combo;

#endif

{

     printf("Contents of int_char_combo_t: \n\n");

     printf("%d\t%c\n", int_char_combo.int1, int_char_combo.ch1);

     return int_char_combo;

}

/*****************************************************************

 * PRINT_STRUCT_REP :

 ****************************************************************/

#ifdef PROTOTYPES

struct small_rep_info_t print_struct_rep(struct small_rep_info_t struct1)

#else

struct small_rep_info_t print_struct_rep( struct1 )

struct small_rep_info_t struct1;

#endif

{

  printf("Contents of struct1: \n\n");

  printf("%10d%10d\n", struct1.value, struct1.head);

  struct1.value =+5;

  return struct1;

}

#ifdef PROTOTYPES

struct array_rep_info_t print_one_large_struct(struct array_rep_info_t linked_list1)

#else

struct array_rep_info_t print_one_large_struct( linked_list1 )

struct array_rep_info_t linked_list1;

#endif

{

      printf("%10d%10d\n", linked_list1.values[0],

                           linked_list1.next_index[0]);

      return linked_list1;

}

/*****************************************************************

 * INIT_ARRAY_REP :

 * IN struct array_rep_info_t *linked_list

 * IN int    seed

 ****************************************************************/

#ifdef PROTOTYPES

void init_array_rep(struct array_rep_info_t *linked_list, int seed)

#else

void init_array_rep( linked_list, seed )

struct array_rep_info_t *linked_list;

int    seed;

#endif

{

  int index;

  for (index = 0; index < 10; index++) {

      linked_list->values[index] = (2*index) + (seed*2);

      linked_list->next_index[index] = index + 1;

  }

  linked_list->head = 0;

}

int main ()  {

  /* variables for large structure testing

   */

  int number = 10;

  struct array_rep_info_t *list1;

  /* variables for testing a small structures and a very long argument list

   */

   struct small_rep_info_t  *struct1;

   struct bit_flags_t       *flags;

   struct bit_flags_combo_t *flags_combo;

   struct three_char_t      *three_char;

   struct five_char_t       *five_char;

   struct int_char_combo_t  *int_char_combo;

   struct one_double_t      *d1;

   struct two_floats_t      *f3;

  /* Allocate space for large structures

   */

  list1 = (struct array_rep_info_t *)malloc(sizeof(struct array_rep_info_t));

  /* Initialize large structures

   */

  init_array_rep(list1, 2);

  /* Print large structures

   */

  print_one_large_struct(*list1);

  /* Allocate space for small structures

   */

  struct1     = (struct small_rep_info_t  *)malloc(sizeof(struct small_rep_info_t));

  flags       = (struct bit_flags_t *)malloc(sizeof(struct bit_flags_t));

  flags_combo = (struct bit_flags_combo_t *)malloc(sizeof(struct bit_flags_combo_t));

  three_char  = (struct three_char_t *)malloc(sizeof(struct three_char_t));

  five_char   = (struct five_char_t *)malloc(sizeof(struct five_char_t));

  int_char_combo = (struct int_char_combo_t *)malloc(sizeof(struct int_char_combo_t));

  d1 = (struct one_double_t *)malloc(sizeof(struct one_double_t));

  f3 = (struct two_floats_t *)malloc(sizeof(struct two_floats_t));

  /* Initialize small structures

   */

  init_one_double ( d1, 1.11111);

  init_two_floats ( f3, -2.345, 1.0);

  init_bit_flags(flags, (unsigned)1, (unsigned)0, (unsigned)1,

                 (unsigned)0, (unsigned)1, (unsigned)0 );

  init_bit_flags_combo(flags_combo, (unsigned)1, (unsigned)0, 'y',

                                     (unsigned)1, (unsigned)0, 'n',

                                     (unsigned)1, (unsigned)0 );

  init_three_chars(three_char, 'x', 'y', 'z');

  init_five_chars(five_char, 'h', 'e', 'l', 'l', 'o');

  init_int_char_combo(int_char_combo, 13, '!');

  init_struct_rep(struct1, 10);

  /* Print small structures

   */

  print_one_double(*d1);

  print_two_floats(*f3);

  print_bit_flags(*flags);

  print_bit_flags_combo(*flags_combo);

  print_three_chars(*three_char);

  print_five_chars(*five_char);

  print_int_char_combo(*int_char_combo);

  print_struct_rep(*struct1);

  loop_count();

  return 0;

}