/**
 * @file   vector.c
 * @brief  Functions for creating and manipulating vectors.
 *
 * @author Jon Schutz
 * @date   05-Feb-2001
 **/

#include "vector.h"
#include <stdlib.h>
#include <string.h>

/** Resize a vector.
    @param v The vector to resize.
    @param size The new size of the vector.  Must be >= 0.
    @param element_size The size of elements in the vector.
    @return 0 on success, -1 if a memory allocation error occurred.
*/
int
vector_resize(vector *v, size_t size, size_t element_size)
{
  void *b;

  b = (v->array)?realloc(v->array, size * element_size)
    :malloc(size * element_size);

  if ((0 < (size * element_size)) && (NULL == b))
    return -1;

  if (size > v->array_size) {
    memset(b + v->array_size * element_size, 0,
	   (size - v->array_size) * element_size);
  }
  v->array = b;
  v->array_size = size;
  return 0;
}

/** Create a new vector. 

    @param v The vector to be initialised.
    @param size The size of the set.
    @param element_size The size of elements in the vector.
    @return 0 on success, -1 on error.
*/
int
vector_create(vector *v, size_t size, size_t element_size)
{
  v->array = NULL;
  v->array_size = 0;
  v->index = 0;
  
  return vector_resize(v, size, element_size);
}

/** Destroy a vector, freeing storage associated with it. */
void
vector_destroy(vector *v)
{
  free(v->array);
  v->array = NULL;
  v->array_size = 0;
}  

int
word_vector_strcmp(const char **a, const char **b)
{
  return strcmp(*a, *b);
}