Simple XML Parser in C using libxml

This is a simple XML parser example in C which uses the libxml library for parsing the XML Documents.
Libxml is a XML processor for the GNOME project. It implements a whole lot of existing standards related to markup languages and a few extras as well.It is open source and can be freely downloaded at ftp://xmlsoft.org/libxml2/

Also some useful documentation about its usage can be found at http://xmlsoft.org/downloads.html

This is just the usage of the library API to get the field values from a XML Document.

For example,

If the XML Doc is somewhat like this :

  
     John Fleck
     June 2, 2002

To get the author name we need to run the program like this -->

Compilation step : gcc xmlParse.c -I/usr/include/libxml2 -L/usr/lib -lxml2 -lz -lpthread -lm

Run : ./a.out test.xml storyinfo author
Output : John Fleck

Remember : This program assumes that the libxml is installed in the system.

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <libxml/xmlmemory.h>
#include <libxml/parser.h>

void die(char *msg)
{
  printf("%s", msg);
  return;
}

void
parseNode (xmlDocPtr doc, xmlNodePtr cur, char *subchild)
{

    xmlChar *key;
    cur = cur->xmlChildrenNode;
    while (cur != NULL)
    {
        if ((!xmlStrcmp(cur->name, (const xmlChar *)subchild)))
        {
            key = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);

            printf("%s\n", key);
            xmlFree(key);
        }
        cur = cur->next;
    }
    return;
}

static void
parseDoc(char *docname, char *child, char *subchild)
{

    xmlDocPtr doc;
    xmlNodePtr cur;

    doc = xmlParseFile(docname);

    if (doc == NULL )
        die("Document parsing failed. \n");

    cur = xmlDocGetRootElement(doc); //Gets the root element of the XML Doc

    if (cur == NULL)
    {
        xmlFreeDoc(doc);
        die("Document is Empty!!!\n");
    }

    cur = cur->xmlChildrenNode;
    while (cur != NULL)
    {
        if ((!xmlStrcmp(cur->name, (const xmlChar *)child)))
        {
            parseNode (doc, cur, subchild);
        }
        cur = cur->next;
    }

    xmlFreeDoc(doc);
    return;
}

int
main(int argc, char **argv)
{
    char *docname;

    if (argc != 4)
    {
        printf("Usage: %s <docname> <child> <subchild>\n", argv[0]);
        return(0);
    }

    docname = argv[1];
    parseDoc (docname,argv[2],argv[3]);

    return (1);
}