/*

 * HTMLtree.c : implementation of access function for an HTML tree.

 *

 * See Copyright for the status of this software.

 *

 * daniel@veillard.com

 */

#define IN_LIBXML

#include "libxml.h"

#ifdef LIBXML_HTML_ENABLED

#include <string.h> /* for memset() only ! */

#ifdef HAVE_CTYPE_H

#include <ctype.h>

#endif

#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#endif

#include <libxml/xmlmemory.h>

#include <libxml/HTMLparser.h>

#include <libxml/HTMLtree.h>

#include <libxml/entities.h>

#include <libxml/valid.h>

#include <libxml/xmlerror.h>

#include <libxml/parserInternals.h>

#include <libxml/globals.h>

#include <libxml/uri.h>

#include "buf.h"

/************************************************************************

 *									*

 *		Getting/Setting encoding meta tags			*

 *									*

 ************************************************************************/

/**

 * htmlGetMetaEncoding:

 * @doc:  the document

 *

 * Encoding definition lookup in the Meta tags

 *

 * Returns the current encoding as flagged in the HTML source

 */

const xmlChar *

htmlGetMetaEncoding(htmlDocPtr doc) {

    htmlNodePtr cur;

    const xmlChar *content;

    const xmlChar *encoding;

    if (doc == NULL)

	return(NULL);

    cur = doc->children;

    /*

     * Search the html

     */

    while (cur != NULL) {

	if ((cur->type == XML_ELEMENT_NODE) && (cur->name != NULL)) {

	    if (xmlStrEqual(cur->name, BAD_CAST"html"))

		break;

	    if (xmlStrEqual(cur->name, BAD_CAST"head"))

		goto found_head;

	    if (xmlStrEqual(cur->name, BAD_CAST"meta"))

		goto found_meta;

	}

	cur = cur->next;

    }

    if (cur == NULL)

	return(NULL);

    cur = cur->children;

    /*

     * Search the head

     */

    while (cur != NULL) {

	if ((cur->type == XML_ELEMENT_NODE) && (cur->name != NULL)) {

	    if (xmlStrEqual(cur->name, BAD_CAST"head"))

		break;

	    if (xmlStrEqual(cur->name, BAD_CAST"meta"))

		goto found_meta;

	}

	cur = cur->next;

    }

    if (cur == NULL)

	return(NULL);

found_head:

    cur = cur->children;

    /*

     * Search the meta elements

     */

found_meta:

    while (cur != NULL) {

	if ((cur->type == XML_ELEMENT_NODE) && (cur->name != NULL)) {

	    if (xmlStrEqual(cur->name, BAD_CAST"meta")) {

		xmlAttrPtr attr = cur->properties;

		int http;

		const xmlChar *value;

		content = NULL;

		http = 0;

		while (attr != NULL) {

		    if ((attr->children != NULL) &&

		        (attr->children->type == XML_TEXT_NODE) &&

		        (attr->children->next == NULL)) {

			value = attr->children->content;

			if ((!xmlStrcasecmp(attr->name, BAD_CAST"http-equiv"))

			 && (!xmlStrcasecmp(value, BAD_CAST"Content-Type")))

			    http = 1;

			else if ((value != NULL)

			 && (!xmlStrcasecmp(attr->name, BAD_CAST"content")))

			    content = value;

			if ((http != 0) && (content != NULL))

			    goto found_content;

		    }

		    attr = attr->next;

		}

	    }

	}

	cur = cur->next;

    }

    return(NULL);

found_content:

    encoding = xmlStrstr(content, BAD_CAST"charset=");

    if (encoding == NULL)

	encoding = xmlStrstr(content, BAD_CAST"Charset=");

    if (encoding == NULL)

	encoding = xmlStrstr(content, BAD_CAST"CHARSET=");

    if (encoding != NULL) {

	encoding += 8;

    } else {

	encoding = xmlStrstr(content, BAD_CAST"charset =");

	if (encoding == NULL)

	    encoding = xmlStrstr(content, BAD_CAST"Charset =");

	if (encoding == NULL)

	    encoding = xmlStrstr(content, BAD_CAST"CHARSET =");

	if (encoding != NULL)

	    encoding += 9;

    }

    if (encoding != NULL) {

	while ((*encoding == ' ') || (*encoding == '\t')) encoding++;

    }

    return(encoding);

}

/**

 * htmlSetMetaEncoding:

 * @doc:  the document

 * @encoding:  the encoding string

 *

 * Sets the current encoding in the Meta tags

 * NOTE: this will not change the document content encoding, just

 * the META flag associated.

 *

 * Returns 0 in case of success and -1 in case of error

 */

int

htmlSetMetaEncoding(htmlDocPtr doc, const xmlChar *encoding) {

    htmlNodePtr cur, meta = NULL, head = NULL;

    const xmlChar *content = NULL;

    char newcontent[100];

    newcontent[0] = 0;

    if (doc == NULL)

	return(-1);

    /* html isn't a real encoding it's just libxml2 way to get entities */

    if (!xmlStrcasecmp(encoding, BAD_CAST "html"))

        return(-1);

    if (encoding != NULL) {

	snprintf(newcontent, sizeof(newcontent), "text/html; charset=%s",

                (char *)encoding);

	newcontent[sizeof(newcontent) - 1] = 0;

    }

    cur = doc->children;

    /*

     * Search the html

     */

    while (cur != NULL) {

	if ((cur->type == XML_ELEMENT_NODE) && (cur->name != NULL)) {

	    if (xmlStrcasecmp(cur->name, BAD_CAST"html") == 0)

		break;

	    if (xmlStrcasecmp(cur->name, BAD_CAST"head") == 0)

		goto found_head;

	    if (xmlStrcasecmp(cur->name, BAD_CAST"meta") == 0)

		goto found_meta;

	}

	cur = cur->next;

    }

    if (cur == NULL)

	return(-1);

    cur = cur->children;

    /*

     * Search the head

     */

    while (cur != NULL) {

	if ((cur->type == XML_ELEMENT_NODE) && (cur->name != NULL)) {

	    if (xmlStrcasecmp(cur->name, BAD_CAST"head") == 0)

		break;

	    if (xmlStrcasecmp(cur->name, BAD_CAST"meta") == 0) {

                head = cur->parent;

		goto found_meta;

            }

	}

	cur = cur->next;

    }

    if (cur == NULL)

	return(-1);

found_head:

    head = cur;

    if (cur->children == NULL)

        goto create;

    cur = cur->children;

found_meta:

    /*

     * Search and update all the remaining the meta elements carrying

     * encoding informations

     */

    while (cur != NULL) {

	if ((cur->type == XML_ELEMENT_NODE) && (cur->name != NULL)) {

	    if (xmlStrcasecmp(cur->name, BAD_CAST"meta") == 0) {

		xmlAttrPtr attr = cur->properties;

		int http;

		const xmlChar *value;

		content = NULL;

		http = 0;

		while (attr != NULL) {

		    if ((attr->children != NULL) &&

		        (attr->children->type == XML_TEXT_NODE) &&

		        (attr->children->next == NULL)) {

			value = attr->children->content;

			if ((!xmlStrcasecmp(attr->name, BAD_CAST"http-equiv"))

			 && (!xmlStrcasecmp(value, BAD_CAST"Content-Type")))

			    http = 1;

			else

                        {

                           if ((value != NULL) &&

                               (!xmlStrcasecmp(attr->name, BAD_CAST"content")))

			       content = value;

                        }

		        if ((http != 0) && (content != NULL))

			    break;

		    }

		    attr = attr->next;

		}

		if ((http != 0) && (content != NULL)) {

		    meta = cur;

		    break;

		}

	    }

	}

	cur = cur->next;

    }

create:

    if (meta == NULL) {

        if ((encoding != NULL) && (head != NULL)) {

            /*

             * Create a new Meta element with the right attributes

             */

            meta = xmlNewDocNode(doc, NULL, BAD_CAST"meta", NULL);

            if (head->children == NULL)

                xmlAddChild(head, meta);

            else

                xmlAddPrevSibling(head->children, meta);

            xmlNewProp(meta, BAD_CAST"http-equiv", BAD_CAST"Content-Type");

            xmlNewProp(meta, BAD_CAST"content", BAD_CAST newcontent);

        }

    } else {

        /* remove the meta tag if NULL is passed */

        if (encoding == NULL) {

            xmlUnlinkNode(meta);

            xmlFreeNode(meta);

        }

        /* change the document only if there is a real encoding change */

        else if (xmlStrcasestr(content, encoding) == NULL) {

            xmlSetProp(meta, BAD_CAST"content", BAD_CAST newcontent);

        }

    }

    return(0);

}

/**

 * booleanHTMLAttrs:

 *

 * These are the HTML attributes which will be output

 * in minimized form, i.e. <option selected="selected"> will be

 * output as <option selected>, as per XSLT 1.0 16.2 "HTML Output Method"

 *

 */

static const char* htmlBooleanAttrs[] = {

  "checked", "compact", "declare", "defer", "disabled", "ismap",

  "multiple", "nohref", "noresize", "noshade", "nowrap", "readonly",

  "selected", NULL

};

/**

 * htmlIsBooleanAttr:

 * @name:  the name of the attribute to check

 *

 * Determine if a given attribute is a boolean attribute.

 *

 * returns: false if the attribute is not boolean, true otherwise.

 */

int

htmlIsBooleanAttr(const xmlChar *name)

{

    int i = 0;

    while (htmlBooleanAttrs[i] != NULL) {

        if (xmlStrcasecmp((const xmlChar *)htmlBooleanAttrs[i], name) == 0)

            return 1;

        i++;

    }

    return 0;

}

#ifdef LIBXML_OUTPUT_ENABLED

/*

 * private routine exported from xmlIO.c

 */

xmlOutputBufferPtr

xmlAllocOutputBufferInternal(xmlCharEncodingHandlerPtr encoder);

/************************************************************************

 *									*

 *			Output error handlers				*

 *									*

 ************************************************************************/

/**

 * htmlSaveErrMemory:

 * @extra:  extra informations

 *

 * Handle an out of memory condition

 */

static void

htmlSaveErrMemory(const char *extra)

{

    __xmlSimpleError(XML_FROM_OUTPUT, XML_ERR_NO_MEMORY, NULL, NULL, extra);

}

/**

 * htmlSaveErr:

 * @code:  the error number

 * @node:  the location of the error.

 * @extra:  extra informations

 *

 * Handle an out of memory condition

 */

static void

htmlSaveErr(int code, xmlNodePtr node, const char *extra)

{

    const char *msg = NULL;

    switch(code) {

        case XML_SAVE_NOT_UTF8:

	    msg = "string is not in UTF-8\n";

	    break;

	case XML_SAVE_CHAR_INVALID:

	    msg = "invalid character value\n";

	    break;

	case XML_SAVE_UNKNOWN_ENCODING:

	    msg = "unknown encoding %s\n";

	    break;

	case XML_SAVE_NO_DOCTYPE:

	    msg = "HTML has no DOCTYPE\n";

	    break;

	default:

	    msg = "unexpected error number\n";

    }

    __xmlSimpleError(XML_FROM_OUTPUT, code, node, msg, extra);

}

/************************************************************************

 *									*

 *		Dumping HTML tree content to a simple buffer		*

 *									*

 ************************************************************************/

/**

 * htmlBufNodeDumpFormat:

 * @buf:  the xmlBufPtr output

 * @doc:  the document

 * @cur:  the current node

 * @format:  should formatting spaces been added

 *

 * Dump an HTML node, recursive behaviour,children are printed too.

 *

 * Returns the number of byte written or -1 in case of error

 */

static size_t

htmlBufNodeDumpFormat(xmlBufPtr buf, xmlDocPtr doc, xmlNodePtr cur,

	           int format) {

    size_t use;

    int ret;

    xmlOutputBufferPtr outbuf;

    if (cur == NULL) {

	return (-1);

    }

    if (buf == NULL) {

	return (-1);

    }

    outbuf = (xmlOutputBufferPtr) xmlMalloc(sizeof(xmlOutputBuffer));

    if (outbuf == NULL) {

        htmlSaveErrMemory("allocating HTML output buffer");

	return (-1);

    }

    memset(outbuf, 0, (size_t) sizeof(xmlOutputBuffer));

    outbuf->buffer = buf;

    outbuf->encoder = NULL;

    outbuf->writecallback = NULL;

    outbuf->closecallback = NULL;

    outbuf->context = NULL;

    outbuf->written = 0;

    use = xmlBufUse(buf);

    htmlNodeDumpFormatOutput(outbuf, doc, cur, NULL, format);

    xmlFree(outbuf);

    ret = xmlBufUse(buf) - use;

    return (ret);

}

/**

 * htmlNodeDump:

 * @buf:  the HTML buffer output

 * @doc:  the document

 * @cur:  the current node

 *

 * Dump an HTML node, recursive behaviour,children are printed too,

 * and formatting returns are added.

 *

 * Returns the number of byte written or -1 in case of error

 */

int

htmlNodeDump(xmlBufferPtr buf, xmlDocPtr doc, xmlNodePtr cur) {

    xmlBufPtr buffer;

    size_t ret;

    if ((buf == NULL) || (cur == NULL))

        return(-1);

    xmlInitParser();

    buffer = xmlBufFromBuffer(buf);

    if (buffer == NULL)

        return(-1);

    ret = htmlBufNodeDumpFormat(buffer, doc, cur, 1);

    xmlBufBackToBuffer(buffer);

    if (ret > INT_MAX)

        return(-1);

    return((int) ret);

}

/**

 * htmlNodeDumpFileFormat:

 * @out:  the FILE pointer

 * @doc:  the document

 * @cur:  the current node

 * @encoding: the document encoding

 * @format:  should formatting spaces been added

 *

 * Dump an HTML node, recursive behaviour,children are printed too.

 *

 * TODO: if encoding == NULL try to save in the doc encoding

 *

 * returns: the number of byte written or -1 in case of failure.

 */

int

htmlNodeDumpFileFormat(FILE *out, xmlDocPtr doc,

	               xmlNodePtr cur, const char *encoding, int format) {

    xmlOutputBufferPtr buf;

    xmlCharEncodingHandlerPtr handler = NULL;

    int ret;

    xmlInitParser();

    if (encoding != NULL) {

	xmlCharEncoding enc;

	enc = xmlParseCharEncoding(encoding);

	if (enc != XML_CHAR_ENCODING_UTF8) {

	    handler = xmlFindCharEncodingHandler(encoding);

	    if (handler == NULL)

		htmlSaveErr(XML_SAVE_UNKNOWN_ENCODING, NULL, encoding);

	}

    }

    /*

     * Fallback to HTML or ASCII when the encoding is unspecified

     */

    if (handler == NULL)

	handler = xmlFindCharEncodingHandler("HTML");

    if (handler == NULL)

	handler = xmlFindCharEncodingHandler("ascii");

    /*

     * save the content to a temp buffer.

     */

    buf = xmlOutputBufferCreateFile(out, handler);

    if (buf == NULL) return(0);

    htmlNodeDumpFormatOutput(buf, doc, cur, encoding, format);

    ret = xmlOutputBufferClose(buf);

    return(ret);

}

/**

 * htmlNodeDumpFile:

 * @out:  the FILE pointer

 * @doc:  the document

 * @cur:  the current node

 *

 * Dump an HTML node, recursive behaviour,children are printed too,

 * and formatting returns are added.

 */

void

htmlNodeDumpFile(FILE *out, xmlDocPtr doc, xmlNodePtr cur) {

    htmlNodeDumpFileFormat(out, doc, cur, NULL, 1);

}

/**

 * htmlDocDumpMemoryFormat:

 * @cur:  the document

 * @mem:  OUT: the memory pointer

 * @size:  OUT: the memory length

 * @format:  should formatting spaces been added

 *

 * Dump an HTML document in memory and return the xmlChar * and it's size.

 * It's up to the caller to free the memory.

 */

void

htmlDocDumpMemoryFormat(xmlDocPtr cur, xmlChar**mem, int *size, int format) {

    xmlOutputBufferPtr buf;

    xmlCharEncodingHandlerPtr handler = NULL;

    const char *encoding;

    xmlInitParser();

    if ((mem == NULL) || (size == NULL))

        return;

    if (cur == NULL) {

	*mem = NULL;

	*size = 0;

	return;

    }

    encoding = (const char *) htmlGetMetaEncoding(cur);

    if (encoding != NULL) {

	xmlCharEncoding enc;

	enc = xmlParseCharEncoding(encoding);

	if (enc != cur->charset) {

	    if (cur->charset != XML_CHAR_ENCODING_UTF8) {

		/*

		 * Not supported yet

		 */

		*mem = NULL;

		*size = 0;

		return;

	    }

	    handler = xmlFindCharEncodingHandler(encoding);

	    if (handler == NULL)

                htmlSaveErr(XML_SAVE_UNKNOWN_ENCODING, NULL, encoding);

	} else {

	    handler = xmlFindCharEncodingHandler(encoding);

	}

    }

    /*

     * Fallback to HTML or ASCII when the encoding is unspecified

     */

    if (handler == NULL)

	handler = xmlFindCharEncodingHandler("HTML");

    if (handler == NULL)

	handler = xmlFindCharEncodingHandler("ascii");

    buf = xmlAllocOutputBufferInternal(handler);

    if (buf == NULL) {

	*mem = NULL;

	*size = 0;

	return;

    }

    htmlDocContentDumpFormatOutput(buf, cur, NULL, format);

    xmlOutputBufferFlush(buf);

    if (buf->conv != NULL) {

	*size = xmlBufUse(buf->conv);

	*mem = xmlStrndup(xmlBufContent(buf->conv), *size);

    } else {

	*size = xmlBufUse(buf->buffer);

	*mem = xmlStrndup(xmlBufContent(buf->buffer), *size);

    }

    (void)xmlOutputBufferClose(buf);

}

/**

 * htmlDocDumpMemory:

 * @cur:  the document

 * @mem:  OUT: the memory pointer

 * @size:  OUT: the memory length

 *

 * Dump an HTML document in memory and return the xmlChar * and it's size.

 * It's up to the caller to free the memory.

 */

void

htmlDocDumpMemory(xmlDocPtr cur, xmlChar**mem, int *size) {

	htmlDocDumpMemoryFormat(cur, mem, size, 1);

}

/************************************************************************

 *									*

 *		Dumping HTML tree content to an I/O output buffer	*

 *									*

 ************************************************************************/

void xmlNsListDumpOutput(xmlOutputBufferPtr buf, xmlNsPtr cur);

/**

 * htmlDtdDumpOutput:

 * @buf:  the HTML buffer output

 * @doc:  the document

 * @encoding:  the encoding string

 *

 * TODO: check whether encoding is needed

 *

 * Dump the HTML document DTD, if any.

 */

static void

htmlDtdDumpOutput(xmlOutputBufferPtr buf, xmlDocPtr doc,

	          const char *encoding ATTRIBUTE_UNUSED) {

    xmlDtdPtr cur = doc->intSubset;

    if (cur == NULL) {

	htmlSaveErr(XML_SAVE_NO_DOCTYPE, (xmlNodePtr) doc, NULL);

	return;

    }

    xmlOutputBufferWriteString(buf, "

    xmlOutputBufferWriteString(buf, (const char *)cur->name);

    if (cur->ExternalID != NULL) {

	xmlOutputBufferWriteString(buf, " PUBLIC ");

	xmlBufWriteQuotedString(buf->buffer, cur->ExternalID);

	if (cur->SystemID != NULL) {

	    xmlOutputBufferWriteString(buf, " ");

	    xmlBufWriteQuotedString(buf->buffer, cur->SystemID);

	}

    } else if (cur->SystemID != NULL &&

	       xmlStrcmp(cur->SystemID, BAD_CAST "about:legacy-compat")) {

	xmlOutputBufferWriteString(buf, " SYSTEM ");

	xmlBufWriteQuotedString(buf->buffer, cur->SystemID);

    }

    xmlOutputBufferWriteString(buf, ">\n");

}

/**

 * htmlAttrDumpOutput:

 * @buf:  the HTML buffer output

 * @doc:  the document

 * @cur:  the attribute pointer

 * @encoding:  the encoding string

 *

 * Dump an HTML attribute

 */

static void

htmlAttrDumpOutput(xmlOutputBufferPtr buf, xmlDocPtr doc, xmlAttrPtr cur,

	           const char *encoding ATTRIBUTE_UNUSED) {

    xmlChar *value;

    /*

     * The html output method should not escape a & character

     * occurring in an attribute value immediately followed by

     * a { character (see Section B.7.1 of the HTML 4.0 Recommendation).

     * This is implemented in xmlEncodeEntitiesReentrant

     */

    if (cur == NULL) {

	return;

    }

    xmlOutputBufferWriteString(buf, " ");

    if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {

        xmlOutputBufferWriteString(buf, (const char *)cur->ns->prefix);

	xmlOutputBufferWriteString(buf, ":");

    }

    xmlOutputBufferWriteString(buf, (const char *)cur->name);

    if ((cur->children != NULL) && (!htmlIsBooleanAttr(cur->name))) {

	value = xmlNodeListGetString(doc, cur->children, 0);

	if (value) {

	    xmlOutputBufferWriteString(buf, "=");

	    if ((cur->ns == NULL) && (cur->parent != NULL) &&

		(cur->parent->ns == NULL) &&

		((!xmlStrcasecmp(cur->name, BAD_CAST "href")) ||

	         (!xmlStrcasecmp(cur->name, BAD_CAST "action")) ||

		 (!xmlStrcasecmp(cur->name, BAD_CAST "src")) ||

		 ((!xmlStrcasecmp(cur->name, BAD_CAST "name")) &&

		  (!xmlStrcasecmp(cur->parent->name, BAD_CAST "a"))))) {

		xmlChar *tmp = value;

		/* xmlURIEscapeStr() escapes '"' so it can be safely used. */

		xmlBufCCat(buf->buffer, "\"");

		while (IS_BLANK_CH(*tmp)) tmp++;

		/* URI Escape everything, except server side includes. */

		for ( ; ; ) {

		    xmlChar *escaped;

		    xmlChar endChar;

		    xmlChar *end = NULL;

		    xmlChar *start = (xmlChar *)xmlStrstr(tmp, BAD_CAST "

		    if (start != NULL) {

			end = (xmlChar *)xmlStrstr(tmp, BAD_CAST "-->");

			if (end != NULL) {

			    *start = '\0';

			}

		    }

		    /* Escape the whole string, or until start (set to '\0'). */

		    escaped = xmlURIEscapeStr(tmp, BAD_CAST"@/:=?;#%&,+");

		    if (escaped != NULL) {

		        xmlBufCat(buf->buffer, escaped);

		        xmlFree(escaped);

		    } else {

		        xmlBufCat(buf->buffer, tmp);

		    }

		    if (end == NULL) { /* Everything has been written. */

			break;

		    }

		    /* Do not escape anything within server side includes. */

		    *start = '<'; /* Restore the first character of "

		    end += 3; /* strlen("-->") */

		    endChar = *end;

		    *end = '\0';

		    xmlBufCat(buf->buffer, start);

		    *end = endChar;

		    tmp = end;

		}

		xmlBufCCat(buf->buffer, "\"");

	    } else {

		xmlBufWriteQuotedString(buf->buffer, value);

	    }

	    xmlFree(value);

	} else  {

	    xmlOutputBufferWriteString(buf, "=\"\"");

	}

    }

}

/**

 * htmlAttrListDumpOutput:

 * @buf:  the HTML buffer output

 * @doc:  the document

 * @cur:  the first attribute pointer

 * @encoding:  the encoding string

 *

 * Dump a list of HTML attributes

 */

static void

htmlAttrListDumpOutput(xmlOutputBufferPtr buf, xmlDocPtr doc, xmlAttrPtr cur, const char *encoding) {

    if (cur == NULL) {

	return;

    }

    while (cur != NULL) {

        htmlAttrDumpOutput(buf, doc, cur, encoding);

	cur = cur->next;

    }

}

/**

 * htmlNodeListDumpOutput:

 * @buf:  the HTML buffer output

 * @doc:  the document

 * @cur:  the first node

 * @encoding:  the encoding string

 * @format:  should formatting spaces been added

 *

 * Dump an HTML node list, recursive behaviour,children are printed too.

 */

static void

htmlNodeListDumpOutput(xmlOutputBufferPtr buf, xmlDocPtr doc,

	               xmlNodePtr cur, const char *encoding, int format) {

    if (cur == NULL) {

	return;

    }

    while (cur != NULL) {

        htmlNodeDumpFormatOutput(buf, doc, cur, encoding, format);

	cur = cur->next;

    }

}

/**

 * htmlNodeDumpFormatOutput:

 * @buf:  the HTML buffer output

 * @doc:  the document

 * @cur:  the current node

 * @encoding:  the encoding string

 * @format:  should formatting spaces been added

 *

 * Dump an HTML node, recursive behaviour,children are printed too.

 */

void

htmlNodeDumpFormatOutput(xmlOutputBufferPtr buf, xmlDocPtr doc,

	                 xmlNodePtr cur, const char *encoding, int format) {

    const htmlElemDesc * info;

    xmlInitParser();

    if ((cur == NULL) || (buf == NULL)) {

	return;

    }

    /*

     * Special cases.

     */

    if (cur->type == XML_DTD_NODE)

	return;

    if ((cur->type == XML_HTML_DOCUMENT_NODE) ||

        (cur->type == XML_DOCUMENT_NODE)){

	htmlDocContentDumpOutput(buf, (xmlDocPtr) cur, encoding);

	return;

    }

    if (cur->type == XML_ATTRIBUTE_NODE) {

        htmlAttrDumpOutput(buf, doc, (xmlAttrPtr) cur, encoding);

	return;

    }

    if (cur->type == HTML_TEXT_NODE) {

	if (cur->content != NULL) {

	    if (((cur->name == (const xmlChar *)xmlStringText) ||

		 (cur->name != (const xmlChar *)xmlStringTextNoenc)) &&

		((cur->parent == NULL) ||

		 ((xmlStrcasecmp(cur->parent->name, BAD_CAST "script")) &&

		  (xmlStrcasecmp(cur->parent->name, BAD_CAST "style"))))) {

		xmlChar *buffer;

		buffer = xmlEncodeEntitiesReentrant(doc, cur->content);

		if (buffer != NULL) {

		    xmlOutputBufferWriteString(buf, (const char *)buffer);

		    xmlFree(buffer);

		}

	    } else {

		xmlOutputBufferWriteString(buf, (const char *)cur->content);

	    }

	}

	return;

    }

    if (cur->type == HTML_COMMENT_NODE) {

	if (cur->content != NULL) {

	    xmlOutputBufferWriteString(buf, "

	    xmlOutputBufferWriteString(buf, (const char *)cur->content);

	    xmlOutputBufferWriteString(buf, "-->");

	}

	return;

    }

    if (cur->type == HTML_PI_NODE) {

	if (cur->name == NULL)