/*------------------------------------------------------------------------------
  string_list.c - Utilities for managing a variable length string list type

  Create the list with new_string_list().

  When you are finished with the list, you must deallocate it with 
  delete_string_list().

  Other functions are:
    append_string_to_list() - Append a string to the string list

  Version 1.0  2015-01-30  Brian B. McGuinness
------------------------------------------------------------------------------*/
#include <stdlib.h>
#include "string_list.h"

#define INITIAL_CAPACITY 16

/*------------------------------------------------------------------------------
  append_string_to_list - Append a string to the string list
------------------------------------------------------------------------------*/
int append_string_to_list (string_list **strlist, string *str) {
  if ((*strlist)->length + 1 >= (*strlist)->capacity) {
    int newsize = sizeof (string_list) + sizeof (string *) * ((*strlist)->capacity << 1);
    string_list *new = realloc (*strlist, newsize);
    if (new == NULL) return FALSE;
    *strlist = new;
    (*strlist)->capacity <<= 1;
  }
  (*strlist)->list[(*strlist)->length++] = clone_string (str);
  return TRUE;
}

/*------------------------------------------------------------------------------
  delete_string_list - Delete a string list
------------------------------------------------------------------------------*/
void delete_string_list (string_list *strlist) {
  if (strlist != NULL) {
    for (int i = 0; i < strlist->length; i++) delete_string (strlist->list[i]);
    free (strlist);
  }
}

/*------------------------------------------------------------------------------
  new_string_list - Create a new string list

  The string list must be deallocated with delete_string_list() when you are 
  finished with it.
------------------------------------------------------------------------------*/
string_list *new_string_list () {
  string_list *result = malloc (sizeof (string_list) + sizeof (string *) * INITIAL_CAPACITY);
  if (result != NULL) {
    result->capacity = INITIAL_CAPACITY;
    result->length   = 0;
  }
  return result;
}