#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <libxml/xmlmemory.h>

#include <libxml/parser.h>

void

parseStory (xmlDocPtr doc, xmlNodePtr cur, char *keyword) {

	xmlNewTextChild (cur, NULL, "keyword", keyword);

    return;

}

xmlDocPtr

parseDoc(char *docname, char *keyword) {

	xmlDocPtr doc;

	xmlNodePtr cur;

	doc = xmlParseFile(docname);

	if (doc == NULL ) {

		fprintf(stderr,"Document not parsed successfully. \n");

		return (NULL);

	}

	cur = xmlDocGetRootElement(doc);

	if (cur == NULL) {

		fprintf(stderr,"empty document\n");

		xmlFreeDoc(doc);

		return (NULL);

	}

	if (xmlStrcmp(cur->name, (const xmlChar *) "story")) {

		fprintf(stderr,"document of the wrong type, root node != story");

		xmlFreeDoc(doc);

		return (NULL);

	}

	cur = cur->xmlChildrenNode;

	while (cur != NULL) {

		if ((!xmlStrcmp(cur->name, (const xmlChar *)"storyinfo"))){

			parseStory (doc, cur, keyword);

		}

	cur = cur->next;

	}

	return(doc);

}

int

main(int argc, char **argv) {

	char *docname;

	char *keyword;

	xmlDocPtr doc;

	if (argc <= 2) {

		printf("Usage: %s docname, keyword\n", argv[0]);

		return(0);

	}

	docname = argv[1];

	keyword = argv[2];

	doc = parseDoc (docname, keyword);

	if (doc != NULL) {

		xmlSaveFormatFile (docname, doc, 0);

		xmlFreeDoc(doc);

	}

	return (1);

}

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