/**
 * int-vector.c
 *   An implementation of "vectors" - Slightly safer arrays.
 */

// +---------+--------------------------------------------------------
// | Headers |
// +---------+

#include <limits.h>
#include <stdio.h>
#include <stdlib.h>

#include "int-vector.h"


// +-------+----------------------------------------------------------
// | Types |
// +-------+

struct int_vector {
  int *values;
  int size;
};


// +-----------+------------------------------------------------------
// | Functions |
// +-----------+

struct int_vector *
iv_new (int size)
{
  struct int_vector *iv = malloc (sizeof (struct int_vector));
  if (iv == NULL)
    return NULL;
  iv->size = size;
  iv->values = malloc (size * sizeof (int));
  if (iv->values == NULL)
    {
      free (iv);
      return NULL;
    }
  return iv;
} // iv_new

int 
iv_get (struct int_vector *iv, int i)
{
  if (iv == NULL)
    {
      fprintf (stderr, "Cannot get values from null vector.\n");
      return INT_MIN;
    }
  else if (i < 0)
    {
      fprintf (stderr, "Cannot use negative indices (%d)\n", i);
      return INT_MIN;
    }
  else if (i >= iv->size)
    {
      fprintf (stderr, "Index %d is not in the range [0,%d)\n", i, iv->size);
      return INT_MIN;
    }
  return iv->values[i];
} // iv_get

void 
iv_set (struct int_vector *iv, int i, int v)
{
  if (iv == NULL)
    {
      fprintf (stderr, "Cannot set values from null vector.\n");
    }
  else if (i < 0)
    {
      fprintf (stderr, "Cannot use negative indices (%d)\n", i);
    }
  else if (i >= iv->size)
    {
      fprintf (stderr, "Index %d is not in the range [0,%d)\n", i, iv->size);
    }
  else
    iv->values[i] = v;
} // iv_set

int 
iv_size (struct int_vector *iv)
{
  if (iv == NULL)
    return 0;
  else
    return iv->size;
} // iv_size