libupnp/ixml/src/nodeList.c

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 * Copyright (c) 2000-2003 Intel Corporation 
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 * Copyright (c) 2012 France Telecom All rights reserved. 
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 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met: 
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 * this list of conditions and the following disclaimer. 
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 * may be used to endorse or promote products derived from this software 
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/*!
 * \file
 */


#include "ixmlparser.h"


#include <assert.h>
#include <string.h>


void ixmlNodeList_init(IXML_NodeList *nList)
{
	assert(nList != NULL);

	memset(nList, 0, sizeof (IXML_NodeList));
}


IXML_Node *ixmlNodeList_item(
	IXML_NodeList *nList,
	unsigned long index)
{
	IXML_NodeList *next;
	unsigned int i;

	/* if the list ptr is NULL */
	if (nList == NULL) {
		return NULL;
	}
	/* if index is more than list length */
	if (index > ixmlNodeList_length(nList) - 1lu) {
		return NULL;
	}

	next = nList;
	for (i = 0u; i < index && next != NULL; ++i) {
		next = next->next;
	}

	if (next == NULL) {
		return NULL;
	}

	return next->nodeItem;
}

int ixmlNodeList_addToNodeList(
	IXML_NodeList **nList,
	IXML_Node *add)
{
	IXML_NodeList *traverse = NULL;
	IXML_NodeList *p = NULL;
	IXML_NodeList *newListItem;

	assert(add != NULL);

	if (add == NULL) {
		return IXML_FAILED;
	}

	if (*nList == NULL) {
		/* nodelist is empty */
		*nList = (IXML_NodeList *)malloc(sizeof (IXML_NodeList));
		if (*nList == NULL) {
			return IXML_INSUFFICIENT_MEMORY;
		}

		ixmlNodeList_init(*nList);
	}

	if ((*nList)->nodeItem == NULL) {
		(*nList)->nodeItem = add;
	} else {
		traverse = *nList;
		while (traverse != NULL) {
			p = traverse;
			traverse = traverse->next;
		}

		newListItem = (IXML_NodeList *)malloc(sizeof (IXML_NodeList));
		if (newListItem == NULL) {
			return IXML_INSUFFICIENT_MEMORY;
		}
		p->next = newListItem;
		newListItem->nodeItem = add;
		newListItem->next = NULL;
	}

	return IXML_SUCCESS;
}


unsigned long ixmlNodeList_length(IXML_NodeList *nList)
{
	IXML_NodeList *list;
	unsigned long length = 0lu;

	list = nList;
	while (list != NULL) {
		++length;
		list = list->next;
	}

	return length;
}


void ixmlNodeList_free(IXML_NodeList *nList)
{
	IXML_NodeList *next;

	while (nList != NULL) {
		next = nList->next;
		free(nList);
		nList = next;
	}
}