/* Primitives Package */

#include "copyright.h"
#include "config.h"

#include <sys/types.h>
#include <stdio.h>
#include <time.h>
#include <ctype.h>
#include <float.h>
#include <assert.h>
#include "db.h"
#include "tune.h"
#include "inst.h"
#include "externs.h"
#include "match.h"
#include "interface.h"
#include "params.h"
#include "fbstrings.h"
#include "interp.h"


/*
  AVL binary tree code by Lynx (or his instructor)

  Modified for MUCK use by Sthiss
  Remodified by Revar
*/

#ifndef AVL_RT
#define AVL_RT(x)  (x->right)
#endif
#ifndef AVL_LF
#define AVL_LF(x)  (x->left)
#endif
#define AVL_KEY(x) (&(x->key))
#define AVL_COMPARE(x,y) array_tree_compare(x,y,0)

static int array_tree_compare(array_iter * a, array_iter * b, int case_sens);

/*
** This function compares two arrays in struct insts (array_iter's).
** The arrays are compared in order until the first difference.
** If the key is the difference, the comparison result is based on the key.
** If the value is the difference, the comparison result is based on the value.
** Comparison of keys and values is done by array_tree_compare().
*/
static int
array_tree_compare_arrays(array_iter * a, array_iter * b, int case_sens)
{
	int more1, more2, res;
	array_iter idx1;
	array_iter idx2;
	array_data *val1;
	array_data *val2;

	if (a->type != PROG_ARRAY || b->type != PROG_ARRAY) {
		return array_tree_compare(a, b, case_sens);
	}

	if (a->data.array == b->data.array) {
		return 0;
	}

	more1 = array_first(a->data.array, &idx1);
	more2 = array_first(b->data.array, &idx2);
	for(;;) {
		if (more1 && more2) {
			val1 = array_getitem(a->data.array, &idx1);
			val2 = array_getitem(b->data.array, &idx2);
			res = array_tree_compare(&idx1, &idx2, case_sens);
			if (res != 0) {
				return res;
			}
			res = array_tree_compare(val1, val2, case_sens);
			if (res != 0) {
				return res;
			}
		} else if (more1) {
			return 1;
		} else if (more2) {
			return -1;
		} else {
			return 0;
		}
		more1 = array_next(a->data.array, &idx1);
		more2 = array_next(b->data.array, &idx2);
	}
	return 0;
}


/*
** Compares two array_iter's (struct insts)
** If they are both either floats or ints, compare to see which is greater.
** If they are both strings, compare string values with given case sensitivity.
** If not, but they are both the same type, compare their values logicly.
** If not, then compare based on an arbitrary ordering of types.
** Returns -1 is a < b.  Returns 1 is a > b.  Returns 0 if a == b.
*/
static int
array_tree_compare(array_iter * a, array_iter * b, int case_sens)
{
	if (a->type != b->type) {
		if (a->type == PROG_INTEGER && b->type == PROG_FLOAT) {
			if (fabs(((double)a->data.number - b->data.fnumber) / (double)a->data.number) < DBL_EPSILON) {
				return 0;
			} else if (a->data.number > b->data.fnumber) {
				return 1;
			} else {
				return -1;
			}
		} else if (a->type == PROG_FLOAT && b->type == PROG_INTEGER) {
			if (fabs((a->data.fnumber - b->data.number) / a->data.fnumber) < DBL_EPSILON) {
				return 0;
			} else if (a->data.fnumber > b->data.number) {
				return 1;
			} else {
				return -1;
			}
		}
		return (a->type - b->type);
	}
	/* Indexes are of same type if we reached here. */
	if (a->type == PROG_FLOAT) {
		if (a->data.fnumber == b->data.fnumber) {
			return 0;
		} else if (fabs((a->data.fnumber - b->data.fnumber) / a->data.fnumber) < DBL_EPSILON) {
			return 0;
		} else if (a->data.fnumber > b->data.fnumber) {
			return 1;
		} else {
			return -1;
		}
	} else if (a->type == PROG_STRING) {
		char *astr = (a->data.string) ? a->data.string->data : "";
		char *bstr = (b->data.string) ? b->data.string->data : "";

		if (0 != case_sens) {
			return strcmp(astr, bstr);
		} else {
			return string_compare(astr, bstr);
		}
	} else if (a->type == PROG_ARRAY) {
		return array_tree_compare_arrays(a, b, case_sens);
	} else if (a->type == PROG_LOCK) {
		/*
		 * In a perfect world, we'd compare the locks by element,
		 * instead of unparsing them into strings for strcmp()s.
		 */
		char* la;
		const char* lb;
		int retval = 0;

		la = string_dup(unparse_boolexp((dbref)1, a->data.lock, 0));
		lb = unparse_boolexp((dbref)1, b->data.lock, 0);
		retval = strcmp(la, lb);
		free(la);
		return retval;
	} else if (a->type == PROG_ADD) {
		int result = (a->data.addr->progref - b->data.addr->progref);

		if (0 != result) {
			return result;
		}
		return (a->data.addr->data - b->data.addr->data);
	} else {
		return (a->data.number - b->data.number);
	}
}

/*@null@*/
static array_tree * 
array_tree_find(array_tree * avl, array_iter * key)
{
	int cmpval;

	while (avl) {
		cmpval = AVL_COMPARE(key, AVL_KEY(avl));
		if (cmpval > 0) {
			avl = AVL_RT(avl);
		} else if (cmpval < 0) {
			avl = AVL_LF(avl);
		} else {
			break;
		}
	}
	return avl;
}

static short 
array_tree_height_of(array_tree * node)
{
	if (node != NULL)
		return node->height;
	else
		return 0;
}

static int
array_tree_height_diff(array_tree * node)
{
	if (node != NULL)
		return (array_tree_height_of(AVL_RT(node)) - array_tree_height_of(AVL_LF(node)));
	else
		return 0;
}

/*\
|*| Note to self: don't do : max (x++,y)
|*| Kim
\*/
#ifndef WIN32
#define max(a, b)       (a > b ? a : b)
#endif

static void
array_tree_fixup_height(array_tree * node)
{
	if (node)
		node->height = (short)(1 +
			max(array_tree_height_of(AVL_LF(node)),
			array_tree_height_of(AVL_RT(node))));
}

static array_tree *
array_tree_rotate_left_single(array_tree * a)
{
	array_tree *b = AVL_RT(a);

	AVL_RT(a) = AVL_LF(b);
	AVL_LF(b) = a;

	array_tree_fixup_height(a);
	array_tree_fixup_height(b);

	return b;
}

static array_tree *
array_tree_rotate_left_double(array_tree * a)
{
	array_tree *b = AVL_RT(a);
	array_tree *c = AVL_LF(b);

	AVL_RT(a) = AVL_LF(c);
	AVL_LF(b) = AVL_RT(c);
	AVL_LF(c) = a;
	AVL_RT(c) = b;

	array_tree_fixup_height(a);
	array_tree_fixup_height(b);
	array_tree_fixup_height(c);

	return c;
}

static array_tree *
array_tree_rotate_right_single(array_tree * a)
{
	array_tree *b = AVL_LF(a);

	AVL_LF(a) = AVL_RT(b);
	AVL_RT(b) = a;

	array_tree_fixup_height(a);
	array_tree_fixup_height(b);

	return (b);
}

static array_tree *
array_tree_rotate_right_double(array_tree * a)
{
	array_tree *b = AVL_LF(a);
	array_tree *c = AVL_RT(b);

	AVL_LF(a) = AVL_RT(c);
	AVL_RT(b) = AVL_LF(c);
	AVL_RT(c) = a;
	AVL_LF(c) = b;

	array_tree_fixup_height(a);
	array_tree_fixup_height(b);
	array_tree_fixup_height(c);

	return c;
}

/*@-branchstate@*/
static array_tree *
array_tree_balance_node(array_tree * a)
{
	int dh = array_tree_height_diff(a);

	if (abs(dh) < 2) {
		array_tree_fixup_height(a);
	} else {
		if (dh == 2) {
			if (array_tree_height_diff(AVL_RT(a)) >= 0) {
				a = array_tree_rotate_left_single(a);
			} else {
				a = array_tree_rotate_left_double(a);
			}
		} else if (array_tree_height_diff(AVL_LF(a)) <= 0) {
			a = array_tree_rotate_right_single(a);
		} else {
			a = array_tree_rotate_right_double(a);
		}
	}
	return a;
}

/*@-nullret -mustfreeonly =branchstate@*/
array_tree *
array_tree_alloc_node(array_iter * key)
{
	array_tree *new_node;

	new_node = (array_tree *) calloc(1,sizeof(array_tree));
	if (!new_node) {
		fprintf(stderr, "array_tree_alloc_node(): Out of Memory!\n");
		abort();
	}

	AVL_LF(new_node) = NULL;
	AVL_RT(new_node) = NULL;
	new_node->height = 1;

	copyinst(key, AVL_KEY(new_node));
	new_node->data.type = PROG_INTEGER;
	new_node->data.data.number = 0;
	return new_node;
}
/*@=nullret =mustfreeonly@*/

void
array_tree_free_node(array_tree * p)
{
	assert(AVL_LF(p) == NULL);
	assert(AVL_RT(p) == NULL);
	CLEAR(AVL_KEY(p));
	CLEAR(&p->data);
	free(p);
}

/*@-usereleased -compdef@*/
static array_tree *
array_tree_insert(array_tree ** avl, array_iter * key)
{
	array_tree *ret;
	register array_tree *p = *avl;
	register int cmp;
	static short balancep;

	if (p) {
		cmp = AVL_COMPARE(key, AVL_KEY(p));
		if (cmp > 0) {
			ret = array_tree_insert(&(AVL_RT(p)), key);
		} else if (cmp < 0) {
			ret = array_tree_insert(&(AVL_LF(p)), key);
		} else {
			balancep = 0;
			return (p);
		}
		if (0 != balancep) {
			*avl = array_tree_balance_node(p);
		}
		return ret;
	} else {
		p = *avl = array_tree_alloc_node(key);
		balancep = 1;
		return (p);
	}
}
/*@=usereleased =compdef@*/

static array_tree *
array_tree_getmax(array_tree * avl)
{
	if (avl && AVL_RT(avl))
		return array_tree_getmax(AVL_RT(avl));
	return avl;
}

static array_tree *
array_tree_remove_node(array_iter * key, array_tree ** root)
{
	array_tree *save;
	array_tree *tmp;
	array_tree *avl = *root;
	int cmpval;

	save = avl;
	if (avl) {
		cmpval = AVL_COMPARE(key, AVL_KEY(avl));
		if (cmpval < 0) {
			save = array_tree_remove_node(key, &AVL_LF(avl));
		} else if (cmpval > 0) {
			save = array_tree_remove_node(key, &AVL_RT(avl));
		} else if (!(AVL_LF(avl))) {
			avl = AVL_RT(avl);
		} else if (!(AVL_RT(avl))) {
			avl = AVL_LF(avl);
		} else {
			tmp = array_tree_remove_node(
					AVL_KEY(array_tree_getmax(AVL_LF(avl))),
					&AVL_LF(avl));
			if (!tmp)
				abort();		/* this shouldn't be possible. */
			AVL_LF(tmp) = AVL_LF(avl);
			AVL_RT(tmp) = AVL_RT(avl);
			avl = tmp;
		}
		if (save) {
			AVL_LF(save) = NULL;
			AVL_RT(save) = NULL;
		}
		*root = array_tree_balance_node(avl);
	}
	return save;
}


static array_tree *
array_tree_delete(array_iter * key, array_tree * avl)
{
	array_tree *save;

	save = array_tree_remove_node(key, &avl);
	if (save)
		array_tree_free_node(save);
	return avl;
}


void
array_tree_delete_all(array_tree * p)
{
	if (!p)
		return;
	array_tree_delete_all(AVL_LF(p));
	array_tree_delete_all(AVL_RT(p));
	AVL_LF(p) = NULL;
	AVL_RT(p) = NULL;
	array_tree_free_node(p);
}


array_tree *
array_tree_first_node(array_tree * list)
{
	if (!list)
		return ((array_tree *) NULL);

	while (AVL_LF(list))
		list = AVL_LF(list);

	return (list);
}


array_tree *
array_tree_last_node(array_tree * list)
{
	if (!list)
		return NULL;

	while (AVL_RT(list))
		list = AVL_RT(list);

	return (list);
}


array_tree *
array_tree_prev_node(array_tree * ptr, array_iter * key)
{
	array_tree *from;
	int cmpval;

	if (!ptr)
		return NULL;
	if (!key)
		return NULL;
	cmpval = AVL_COMPARE(key, AVL_KEY(ptr));
	if (cmpval > 0) {
		from = array_tree_prev_node(AVL_RT(ptr), key);
		if (from)
			return from;
		return ptr;
	} else if (cmpval < 0) {
		return array_tree_prev_node(AVL_LF(ptr), key);
	} else if (AVL_LF(ptr)) {
		from = AVL_LF(ptr);
		while (AVL_RT(from))
			from = AVL_RT(from);
		return from;
	} else {
		return NULL;
	}
}



array_tree *
array_tree_next_node(array_tree * ptr, array_iter * key)
{
	array_tree *from;
	int cmpval;

	if (!ptr)
		return NULL;
	if (!key)
		return NULL;
	cmpval = AVL_COMPARE(key, AVL_KEY(ptr));
	if (cmpval < 0) {
		from = array_tree_next_node(AVL_LF(ptr), key);
		if (from)
			return from;
		return ptr;
	} else if (cmpval > 0) {
		return array_tree_next_node(AVL_RT(ptr), key);
	} else if (AVL_RT(ptr)) {
		from = AVL_RT(ptr);
		while (AVL_LF(from))
			from = AVL_LF(from);
		return from;
	} else {
		return NULL;
	}
}



/*****************************************************************
 *  Stack Array Handling Routines
 *****************************************************************/

stk_array *
new_array(void)
{
	stk_array *nu;

	nu = (stk_array *) malloc(sizeof(stk_array));
	nu->links = 1;
	nu->type = ARRAY_UNDEFINED;
	nu->items = 0;
	nu->pinned = 0;
	nu->data.packed = NULL;

	return nu;
}


stk_array *
new_array_packed(int size)
{
	stk_array *nu;
	int i;

	if (size < 0) {
		return NULL;
	}

	nu = new_array();
	nu->items = size;
	nu->type = ARRAY_PACKED;
	if (size < 1)
		size = 1;
	nu->data.packed = (array_data *) malloc(sizeof(array_data) * size);
	for (i = size; i-- > 0;) {
		nu->data.packed[i].type = PROG_INTEGER;
		nu->data.packed[i].line = 0;
		nu->data.packed[i].data.number = 0;
	}
	return nu;
}


stk_array *
new_array_dictionary(void)
{
	stk_array *nu;

	nu = new_array();
	nu->type = ARRAY_DICTIONARY;
	return nu;
}


void
array_set_pinned(stk_array* arr, int pinned)
{
	if (arr) {
		arr->pinned = pinned;
	}
}


stk_array *
array_decouple(stk_array * arr)
{
	stk_array *nu;

	if (!arr) {
		return NULL;
	}

	nu = new_array();
	nu->pinned = arr->pinned;
	nu->type = arr->type;
	switch (arr->type) {
	case ARRAY_PACKED:{
			int i;

			nu->items = arr->items;
			nu->data.packed = (array_data *) malloc(sizeof(array_data) * arr->items);
			for (i = arr->items; i-- > 0;) {
				copyinst(&arr->data.packed[i], &nu->data.packed[i]);
			}
			return nu;
			break;
		}

	case ARRAY_DICTIONARY:{
			array_iter idx;
			array_data *val;

			if (array_first(arr, &idx)) {
				do {
					val = array_getitem(arr, &idx);
					array_setitem(&nu, &idx, val);
				} while (array_next(arr, &idx));
			}
			return nu;
			break;
		}

	default:
		break;
	}
	return NULL;
}


stk_array *
array_promote(stk_array * arr)
{
	stk_array *nu;
	int i;
	array_iter idx;

	if (!arr) {
		return NULL;
	}
	if (arr->type != ARRAY_PACKED) {
		return NULL;
	}

	nu = new_array_dictionary();

	idx.type = PROG_INTEGER;
	for (i = 0; i < arr->items; i++) {
		idx.data.number = i;
		array_setitem(&nu, &idx, array_getitem(arr, &idx));
	}
	array_free(arr);

	return nu;
}


void
array_free(stk_array * arr)
{
	if (!arr) {
		return;
	}
	arr->links--;
	if (arr->links > 0) {
		return;
	}
	switch (arr->type) {
	case ARRAY_PACKED:{
			int i;

			for (i = arr->items; i-- > 0;) {
				CLEAR(&arr->data.packed[i]);
			}
			free(arr->data.packed);
			break;
		}
	case ARRAY_DICTIONARY:
		array_tree_delete_all(arr->data.dict);

	default:{
			break;
		}
	}
	arr->items = 0;
	arr->data.packed = NULL;
	arr->type = ARRAY_UNDEFINED;
	free(arr);
}


int
array_count(stk_array * arr)
{
	if (!arr) {
		return 0;
	}
	return arr->items;
}


int
array_idxcmp(array_iter * a, array_iter * b)
{
	return array_tree_compare(a, b, 0);
}


int
array_idxcmp_case(array_iter * a, array_iter * b, int case_sens)
{
	return array_tree_compare(a, b, case_sens);
}


int
array_contains_key(stk_array * arr, array_iter * item)
{
	if (!arr || !arr->items) {
		return 0;
	}
	switch (arr->type) {
	case ARRAY_PACKED:{
			if (item->type != PROG_INTEGER) {
				return 0;
			}
			if (item->data.number >= 0 && item->data.number < arr->items) {
				return 1;
			}
			return 0;
			break;
		}
	case ARRAY_DICTIONARY:{
			if (array_tree_find(arr->data.dict, item)) {
				return 1;
			}
			return 0;
		}
	default:{
			break;
		}
	}
	return 0;
}


int
array_contains_value(stk_array * arr, array_data * item)
{
	if (!arr || !arr->items) {
		return 0;
	}
	switch (arr->type) {
	case ARRAY_PACKED:{
			int i;

			for (i = arr->items; i-- > 0;) {
				if (!array_tree_compare(&arr->data.packed[i], item, 0)) {
					return 1;
				}
			}
			return 0;
			break;
		}
	case ARRAY_DICTIONARY:{
			array_tree *p;

			p = array_tree_first_node(arr->data.dict);
			if (!p)
				return 0;
			while (p) {
				if (!array_tree_compare(&p->data, item, 0)) {
					return 1;
				}
				p = array_tree_next_node(arr->data.dict, &p->data);
			}
			return 0;
		}
	default:{
			break;
		}
	}
	return 0;
}


int
array_first(stk_array * arr, array_iter * item)
{
	if (!arr || !arr->items) {
		return 0;
	}
	switch (arr->type) {
	case ARRAY_PACKED:{
			item->type = PROG_INTEGER;
			item->data.number = 0;
			return 1;
			break;
		}
	case ARRAY_DICTIONARY:{
			array_tree *p;

			p = array_tree_first_node(arr->data.dict);
			if (!p)
				return 0;
			copyinst(&p->key, item);
			return 1;
		}
	default:{
			break;
		}
	}
	return 0;
}


int
array_last(stk_array * arr, array_iter * item)
{
	if (!arr || !arr->items) {
		return 0;
	}
	switch (arr->type) {
	case ARRAY_PACKED:{
			item->type = PROG_INTEGER;
			item->data.number = arr->items - 1;
			return 1;
			break;
		}
	case ARRAY_DICTIONARY:{
			array_tree *p;

			p = array_tree_last_node(arr->data.dict);
			if (!p)
				return 0;
			copyinst(&p->key, item);
			return 1;
		}
	default:{
			break;
		}
	}
	return 0;
}


int
array_prev(stk_array * arr, array_iter * item)
{
	if (!arr || !arr->items) {
		return 0;
	}
	switch (arr->type) {
	case ARRAY_PACKED:{
			int idx;

			if (item->type == PROG_STRING) {
				CLEAR(item);
				return 0;
			} else if (item->type == PROG_FLOAT) {
				if (item->data.fnumber >= arr->items) {
					idx = arr->items - 1;
				} else {
					idx = item->data.fnumber - 1.0;
				}
			} else {
				idx = item->data.number - 1;
			}
			CLEAR(item);
			if (idx >= arr->items) {
				idx = arr->items - 1;
			} else if (idx < 0) {
				return 0;
			}
			item->type = PROG_INTEGER;
			item->data.number = idx;
			return 1;
			break;
		}
	case ARRAY_DICTIONARY:{
			array_tree *p;

			p = array_tree_prev_node(arr->data.dict, item);
			CLEAR(item);
			if (!p)
				return 0;
			copyinst(&p->key, item);
			return 1;
		}
	default:{
			break;
		}
	}
	return 0;
}


int
array_next(stk_array * arr, array_iter * item)
{
	if (!arr || !arr->items) {
		return 0;
	}
	switch (arr->type) {
	case ARRAY_PACKED:{
			int idx;

			if (item->type == PROG_STRING) {
				CLEAR(item);
				return 0;
			} else if (item->type == PROG_FLOAT) {
				if (item->data.fnumber < 0.0) {
					idx = 0;
				} else {
					idx = item->data.fnumber + 1.0;
				}
			} else {
				idx = item->data.number + 1;
			}
			CLEAR(item);
			if (idx >= arr->items) {
				return 0;
			} else if (idx < 0) {
				idx = 0;
			}
			item->type = PROG_INTEGER;
			item->data.number = idx;
			return 1;
			break;
		}
	case ARRAY_DICTIONARY:{
			array_tree *p;

			p = array_tree_next_node(arr->data.dict, item);
			CLEAR(item);
			if (!p)
				return 0;
			copyinst(&p->key, item);
			return 1;
		}
	default:{
			break;
		}
	}
	return 0;
}


array_data *
array_getitem(stk_array * arr, array_iter * idx)
{
	if (!arr || !idx) {
		return NULL;
	}
	switch (arr->type) {
	case ARRAY_PACKED:
		if (idx->type != PROG_INTEGER) {
			return NULL;
		}
		if (idx->data.number < 0 || idx->data.number >= arr->items) {
			return NULL;
		}
		return &arr->data.packed[idx->data.number];
		break;

	case ARRAY_DICTIONARY:{
			array_tree *p;

			p = array_tree_find(arr->data.dict, idx);
			if (!p) {
				return NULL;
			}
			return &p->data;
		}

	default:
		break;
	}
	return NULL;
}


int
array_setitem(stk_array ** harr, array_iter * idx, array_data * item)
{
	stk_array *arr;

	if (!harr || !*harr || !idx) {
		return -1;
	}
	arr = *harr;
	switch (arr->type) {
	case ARRAY_PACKED:{
			if (idx->type != PROG_INTEGER) {
				return -1;
			}
			if (idx->data.number >= 0 && idx->data.number < arr->items) {
				if (arr->links > 1 && !arr->pinned) {
					arr->links--;
					arr = *harr = array_decouple(arr);
				}
				CLEAR(&arr->data.packed[idx->data.number]);
				copyinst(item, &arr->data.packed[idx->data.number]);
				return arr->items;
			} else if (idx->data.number == arr->items) {
				if (arr->links > 1 && !arr->pinned) {
					arr->links--;
					arr = *harr = array_decouple(arr);
				}
				arr->data.packed = (array_data*)
						realloc(arr->data.packed, sizeof(array_data) * (arr->items + 1));
				copyinst(item, &arr->data.packed[arr->items]);
				return (++arr->items);
			} else {
				return -1;
			}
			break;
		}

	case ARRAY_DICTIONARY:{
			array_tree *p;

			if (arr->links > 1 && !arr->pinned) {
				arr->links--;
				arr = *harr = array_decouple(arr);
			}
			p = array_tree_find(arr->data.dict, idx);
			if (p) {
				CLEAR(&p->data);
			} else {
				arr->items++;
				p = array_tree_insert(&arr->data.dict, idx);
			}
			copyinst(item, &p->data);
			return arr->items;
			break;
		}

	default:
		break;
	}
	return -1;
}



int
array_insertitem(stk_array ** harr, array_iter * idx, array_data * item)
{
	stk_array *arr;
	int i;

	if (!harr || !*harr || !idx) {
		return -1;
	}
	arr = *harr;
	switch (arr->type) {
	case ARRAY_PACKED:{
			if (idx->type != PROG_INTEGER) {
				return -1;
			}
			if (idx->data.number < 0 || idx->data.number > arr->items) {
				return -1;
			}
			if (arr->links > 1 && !arr->pinned) {
				arr->links--;
				arr = *harr = array_decouple(arr);
			}
			arr->data.packed = (array_data*)
					realloc(arr->data.packed, sizeof(array_data) * (arr->items + 1));
			for (i = arr->items++; i > idx->data.number; i--) {
				copyinst(&arr->data.packed[i - 1], &arr->data.packed[i]);
				CLEAR(&arr->data.packed[i - 1]);
			}
			copyinst(item, &arr->data.packed[i]);
			return arr->items;
			break;
		}

	case ARRAY_DICTIONARY:{
			array_tree *p;

			if (arr->links > 1 && !arr->pinned) {
				arr->links--;
				arr = *harr = array_decouple(arr);
			}
			p = array_tree_find(arr->data.dict, idx);
			if (p) {
				CLEAR(&p->data);
			} else {
				arr->items++;
				p = array_tree_insert(&arr->data.dict, idx);
			}
			copyinst(item, &p->data);
			return arr->items;
			break;
		}

	default:
		break;
	}
	return -1;
}



int
array_appenditem(stk_array ** harr, array_data * item)
{
	struct inst key;

	if (!harr || !*harr)
		return -1;
	if ((*harr)->type != ARRAY_PACKED)
		return -1;
	key.type = PROG_INTEGER;
	key.data.number = array_count(*harr);

	return array_setitem(harr, &key, item);
}



stk_array *
array_getrange(stk_array * arr, array_iter * start, array_iter * end)
{
	stk_array *nu;
	array_data *tmp;
	int sidx, eidx;

	if (!arr) {
		return NULL;
	}
	switch (arr->type) {
	case ARRAY_PACKED:{
			array_iter idx;
			array_iter didx;

			if (start->type != PROG_INTEGER) {
				return NULL;
			}
			if (end->type != PROG_INTEGER) {
				return NULL;
			}
			sidx = start->data.number;
			eidx = end->data.number;
			if (sidx < 0) {
				sidx = 0;
			} else if (sidx >= arr->items) {
				return NULL;
			}
			if (eidx >= arr->items) {
				eidx = arr->items - 1;
			} else if (eidx < 0) {
				return NULL;
			}
			if (sidx > eidx) {
				return NULL;
			}
			idx.type = PROG_INTEGER;
			idx.data.number = sidx;
			didx.type = PROG_INTEGER;
			didx.data.number = 0;
			nu = new_array_packed(eidx - sidx + 1);
			while (idx.data.number <= eidx) {
				tmp = array_getitem(arr, &idx);
				if (!tmp)
					break;
				array_setitem(&nu, &didx, tmp);
				didx.data.number++;
				idx.data.number++;
			}
			return nu;
			break;
		}

	case ARRAY_DICTIONARY:{
			stk_array *nu;
			array_tree *s;
			array_tree *e;

			nu = new_array_dictionary();
			s = array_tree_find(arr->data.dict, start);
			if (!s) {
				s = array_tree_next_node(arr->data.dict, start);
				if (!s) {
					return nu;
				}
			}
			e = array_tree_find(arr->data.dict, end);
			if (!e) {
				e = array_tree_prev_node(arr->data.dict, end);
				if (!e) {
					return nu;
				}
			}
			if (array_tree_compare(&s->key, &e->key, 0) > 0) {
				return nu;
			}
			while (s) {
				array_setitem(&nu, &s->key, &s->data);
				if (s == e)
					break;
				s = array_tree_next_node(arr->data.dict, &s->key);
			}
			return nu;
			break;
		}

	default:
		break;
	}
	return NULL;
}


int
array_setrange(stk_array ** harr, array_iter * start, stk_array * inarr)
{
	stk_array *arr;
	array_iter idx;

	if (!harr || !*harr) {
		return -1;
	}
	arr = *harr;
	if (!inarr || !inarr->items) {
		return arr->items;
	}
	switch (arr->type) {
	case ARRAY_PACKED:{
			if (!start) {
				return -1;
			}
			if (start->type != PROG_INTEGER) {
				return -1;
			}
			if (start->data.number < 0 || start->data.number > arr->items) {
				return -1;
			}
			if (arr->links > 1 && !arr->pinned) {
				arr->links--;
				arr = *harr = array_decouple(arr);
			}
			if (array_first(inarr, &idx)) {
				do {
					array_setitem(&arr, start, array_getitem(inarr, &idx));
					start->data.number++;
				} while (array_next(inarr, &idx));
			}
			return arr->items;
			break;
		}

	case ARRAY_DICTIONARY:{
			if (arr->links > 1 && !arr->pinned) {
				arr->links--;
				arr = *harr = array_decouple(arr);
			}
			if (array_first(inarr, &idx)) {
				do {
					array_setitem(&arr, &idx, array_getitem(inarr, &idx));
				} while (array_next(inarr, &idx));
			}
			return arr->items;
			break;
		}

	default:
		break;
	}
	return -1;
}


int
array_insertrange(stk_array ** harr, array_iter * start, stk_array * inarr)
{
	stk_array *arr;
	array_data *itm;
	array_iter idx;
	array_iter didx;

	if (!harr || !*harr) {
		return -1;
	}
	arr = *harr;
	if (!inarr || !inarr->items) {
		return arr->items;
	}
	switch (arr->type) {
	case ARRAY_PACKED:{
			if (!start) {
				return -1;
			}
			if (start->type != PROG_INTEGER) {
				return -1;
			}
			if (start->data.number < 0 || start->data.number > arr->items) {
				return -1;
			}
			if (arr->links > 1 && !arr->pinned) {
				arr->links--;
				arr = *harr = array_decouple(arr);
			}
			arr->data.packed = (struct inst*)
					realloc(arr->data.packed, sizeof(array_data) * (arr->items + inarr->items));
			copyinst(start, &idx);
			copyinst(start, &didx);
			idx.data.number = arr->items - 1;
			didx.data.number = arr->items + inarr->items - 1;
			while (idx.data.number >= start->data.number) {
				itm = array_getitem(arr, &idx);
				copyinst(itm, &arr->data.packed[didx.data.number]);
				CLEAR(itm);
				idx.data.number--;
				didx.data.number--;
			}
			if (array_first(inarr, &idx)) {
				do {
					itm = array_getitem(inarr, &idx);
					copyinst(itm, &arr->data.packed[start->data.number]);
					start->data.number++;
				} while (array_next(inarr, &idx));
			}
			arr->items += inarr->items;
			return arr->items;
			break;
		}

	case ARRAY_DICTIONARY:{
			if (arr->links > 1 && !arr->pinned) {
				arr->links--;
				arr = *harr = array_decouple(arr);
			}
			if (array_first(inarr, &idx)) {
				do {
					array_setitem(&arr, &idx, array_getitem(inarr, &idx));
				} while (array_next(inarr, &idx));
			}
			return arr->items;
			break;
		}

	default:
		break;
	}
	return -1;
}


int
array_delrange(stk_array ** harr, array_iter * start, array_iter * end)
{
	stk_array *arr;
	array_data *itm;
	int sidx, eidx, totsize;
	array_iter idx;
	array_iter didx;

	if (!harr || !*harr) {
		return -1;
	}
	arr = *harr;
	switch (arr->type) {
	case ARRAY_PACKED:{
			if (start->type != PROG_INTEGER) {
				return -1;
			}
			if (end->type != PROG_INTEGER) {
				return -1;
			}
			if (arr->items == 0) { /* nothing to do here */
				return 0;
			}
			sidx = start->data.number;
			eidx = end->data.number;
			if (sidx < 0) {
				sidx = 0;
			} else if (sidx >= arr->items) {
				return -1;
			}
			if (eidx >= arr->items) {
				eidx = arr->items - 1;
			} else if (eidx < 0) {
				return -1;
			}
			if (sidx > eidx) {
				return -1;
			}
			if (arr->links > 1 && !arr->pinned) {
				arr->links--;
				arr = *harr = array_decouple(arr);
			}
			start->data.number = sidx;
			end->data.number = eidx;
			copyinst(end, &idx);
			copyinst(start, &didx);
			idx.data.number += 1;
			while (idx.data.number < arr->items) {
				itm = array_getitem(arr, &idx);
				copyinst(itm, &arr->data.packed[didx.data.number]);
				CLEAR(itm);
				idx.data.number++;
				didx.data.number++;
			}
			arr->items -= (eidx - sidx + 1);
			totsize = (arr->items)?arr->items:1;
			arr->data.packed = (array_data*)
					realloc(arr->data.packed, sizeof(array_data) * totsize);
			return arr->items;
			break;
		}

	case ARRAY_DICTIONARY:{
			array_tree *s;
			array_tree *e;

			s = array_tree_find(arr->data.dict, start);
			if (!s) {
				s = array_tree_next_node(arr->data.dict, start);
				if (!s) {
					return arr->items;
				}
			}
			e = array_tree_find(arr->data.dict, end);
			if (!e) {
				e = array_tree_prev_node(arr->data.dict, end);
				if (!e) {
					return arr->items;
				}
			}
			if (array_tree_compare(&s->key, &e->key, 0) > 0) {
				return arr->items;
			}
			if (arr->links > 1 && !arr->pinned) {
				arr->links--;
				arr = *harr = array_decouple(arr);
			}
			copyinst(&s->key, &idx);
			while (s && array_tree_compare(&s->key, &e->key, 0) <= 0) {
				arr->data.dict = array_tree_delete(&s->key, arr->data.dict);
				arr->items--;
				s = array_tree_next_node(arr->data.dict, &idx);
			}
			CLEAR(&idx);
			return arr->items;
			break;
		}

	default:
		break;
	}
	return -1;
}


int
array_delitem(stk_array ** harr, array_iter * item)
{
	array_iter idx;
	int result;

	copyinst(item, &idx);
	result = array_delrange(harr, item, &idx);
	CLEAR(&idx);
	return result;
}


/*\
|*| Must not code b-trees, must not code b-trees...
\*/

/*\
|*| I use 4-space tabs, darn it.
\*/


/*\
|*| array_demote_only
|*| array demote discards the values of a dictionary, and
|*| returns a packed list of the keys.
|*| (Useful because keys are ordered and unique, presumably.)
|*| (This allows the keys to be abused as sets.)
\*/
stk_array *
array_demote_only(stk_array * arr, int threshold)
{
	stk_array *demoted_array = NULL;
	int items_left = 0;
	array_iter current_key;
	array_iter *current_value;
	array_iter new_index;

	if (!arr || ARRAY_DICTIONARY != arr->type)
		return NULL;

	new_index.type = PROG_INTEGER;;
	new_index.data.number = 0;
	demoted_array = new_array_packed(0);
	items_left = array_first(arr, &current_key);
	while (items_left) {
		current_value = array_getitem(arr, &current_key);
		if (PROG_INTEGER == current_value->type && current_value->data.number >= threshold) {
			array_insertitem(&demoted_array, &new_index, &current_key);
			new_index.data.number++;
		}
		items_left = array_next(arr, &current_key);
	}
	return demoted_array;
}

/*\
|*| array_mash
|*| Takes the lists of values from the first array and
|*| uses each value as a key in the second array.  For
|*| each key, the passed "change_by" value is applied to
|*| any existing value.  If the value does not exist, it
|*| is set.
|*| This will be the core of the different/union/intersection
|*| code.
|*| Of course, this is going to absolutely blow chunks when
|*| passed an array with value types that can't be used as
|*| key values in an array.  Blast.  That may be infeasible
|*| regardless, though.
\*/
void
array_mash(stk_array * arr_in, stk_array ** mash, int value)
{

	int still_values = 0;
	array_iter current_key;
	array_iter *current_keyval;
	array_iter *current_value;
	array_data temp_value;

	if (NULL == arr_in || NULL == mash || NULL == *mash)
		return;

	still_values = array_first(arr_in, &current_key);
	while (still_values) {
		current_keyval = array_getitem(arr_in, &current_key);
		current_value = array_getitem(*mash, current_keyval);
		if (NULL != current_value) {
			if (PROG_INTEGER == current_value->type) {
				copyinst(current_value, &temp_value);
				temp_value.data.number += value;
				array_setitem(mash, current_keyval, &temp_value);
			}
		} else {
			temp_value.type = PROG_INTEGER;
			temp_value.data.number = value;
			array_insertitem(mash, current_keyval, &temp_value);
		}
		still_values = array_next(arr_in, &current_key);
	}
}



int
array_is_homogenous(stk_array * arr, int typ)
{
	array_iter idx;
	array_data *dat;
	int failedflag = 0;

	if (array_first(arr, &idx)) {
		do {
			dat = array_getitem(arr, &idx);
			if (dat->type != typ) {
				failedflag = 1;
			}
		} while (array_next(arr, &idx));
	}
	return (!failedflag);
}



/**** STRKEY ****/

int
array_set_strkey(stk_array ** harr, const char *key, struct inst *val)
{
	struct inst name;
	int result;

	name.type = PROG_STRING;
	name.data.string = alloc_prog_string(key);

	result = array_setitem(harr, &name, val);

	CLEAR(&name);

	return result;
}

int
array_set_strkey_intval(stk_array ** arr, const char *key, int val)
{
	struct inst value;
	int result;

	value.type = PROG_INTEGER;
	value.data.number = val;

	result = array_set_strkey(arr, key, &value);

	CLEAR(&value);

	return result;
}

int
array_set_strkey_fltval(stk_array ** arr, const char *key, double val)
{
	struct inst value;
	int result;

	value.type = PROG_FLOAT;
	value.data.fnumber = val;

	result = array_set_strkey(arr, key, &value);

	CLEAR(&value);

	return result;
}

int
array_set_strkey_strval(stk_array ** harr, const char *key, const char *val)
{
	struct inst value;
	int result;

	value.type = PROG_STRING;
	value.data.string = alloc_prog_string(val);

	result = array_set_strkey(harr, key, &value);

	CLEAR(&value);

	return result;
}

int
array_set_strkey_refval(stk_array ** harr, const char *key, dbref val)
{
	struct inst value;
	int result;

	value.type = PROG_OBJECT;
	value.data.objref = val;

	result = array_set_strkey(harr, key, &value);

	CLEAR(&value);

	return result;
}

int
array_set_strkey_arrval(stk_array ** harr, const char *key, stk_array* val)
{
	struct inst value;
	int result;

	value.type = PROG_ARRAY;
	value.data.array = val;

	result = array_set_strkey(harr, key, &value);

	CLEAR(&value);

	return result;
}



/**** INTKEY ****/

int
array_set_intkey(stk_array ** harr, int key, struct inst *val)
{
	struct inst name;
	int result;

	name.type = PROG_INTEGER;
	name.data.number = key;

	result = array_setitem(harr, &name, val);

	CLEAR(&name);

	return result;
}

int
array_set_intkey_intval(stk_array ** harr, int key, int val)
{
	struct inst value;
	int result;

	value.type = PROG_INTEGER;
	value.data.number = val;

	result = array_set_intkey(harr, key, &value);

	CLEAR(&value);

	return result;
}

int
array_set_intkey_fltval(stk_array ** harr, int key, double val)
{
	struct inst value;
	int result;

	value.type = PROG_FLOAT;
	value.data.fnumber = val;

	result = array_set_intkey(harr, key, &value);

	CLEAR(&value);

	return result;
}

int
array_set_intkey_refval(stk_array ** harr, int key, dbref val)
{
	struct inst value;
	int result;

	value.type = PROG_OBJECT;
	value.data.objref = val;

	result = array_set_intkey(harr, key, &value);

	CLEAR(&value);

	return result;
}

int
array_set_intkey_strval(stk_array ** harr, int key, const char *val)
{
	struct inst value;
	int result;

	value.type = PROG_STRING;
	value.data.string = alloc_prog_string(val);

	result = array_set_intkey(harr, key, &value);

	CLEAR(&value);

	return result;
}

int
array_set_intkey_arrval(stk_array ** harr, int key, stk_array* val)
{
	struct inst value;
	int result;

	value.type = PROG_ARRAY;
	value.data.array = val;

	result = array_set_intkey(harr, key, &value);

	CLEAR(&value);

	return result;
}


char*
array_get_intkey_strval(stk_array * arr, int key)
{
	struct inst ikey;
	array_data *value;

	ikey.type = PROG_INTEGER;
	ikey.data.number = key;

	value = array_getitem(arr, &ikey);

	CLEAR(&ikey);

	if (!value || value->type != PROG_STRING) {
		return NULL;
	} else if (!value->data.string) {
		return "";
	} else {
		return value->data.string->data;
	}
}




/**** KEY-VAL ****/

int
array_set_strval(stk_array ** harr, struct inst* key, const char *val)
{
	struct inst value;
	int result;

	value.type = PROG_STRING;
	value.data.string = alloc_prog_string(val);

	result = array_setitem(harr, key, &value);

	CLEAR(&value);

	return result;
}

int
array_set_intval(stk_array ** harr, struct inst* key, int val)
{
	struct inst value;
	int result;

	value.type = PROG_INTEGER;
	value.data.number = val;

	result = array_setitem(harr, key, &value);

	CLEAR(&value);

	return result;
}

int
array_set_fltval(stk_array ** harr, struct inst* key, double val)
{
	struct inst value;
	int result;

	value.type = PROG_FLOAT;
	value.data.fnumber = val;

	result = array_setitem(harr, key, &value);

	CLEAR(&value);

	return result;
}

int
array_set_refval(stk_array ** harr, struct inst* key, dbref val)
{
	struct inst value;
	int result;

	value.type = PROG_OBJECT;
	value.data.objref = val;

	result = array_setitem(harr, key, &value);

	CLEAR(&value);

	return result;
}

int
array_set_arrval(stk_array ** harr, struct inst* key, stk_array* val)
{
	struct inst value;
	int result;

	value.type = PROG_ARRAY;
	value.data.array = val;

	result = array_setitem(harr, key, &value);

	CLEAR(&value);

	return result;
}