/**

 * section: xmlReader

 * synopsis: Parse multiple XML files reusing an xmlReader

 * purpose: Demonstrate the use of xmlReaderForFile() and

 * xmlReaderNewFile to parse XML files while reusing the reader object

 * and parser context.  (Note that the XMLReader functions require

 * libxml2 version later than 2.6.)

 * usage: reader4 <filename> [ filename ... ]

 * test: reader4 test1.xml test2.xml test3.xml > reader4.tmp && diff reader4.tmp $(srcdir)/reader4.res

 * author: Graham Bennett

 * copy: see Copyright for the status of this software.

 */

#include <stdio.h>

#include <libxml/xmlreader.h>

#ifdef LIBXML_READER_ENABLED

static void processDoc(xmlTextReaderPtr readerPtr) {

    int ret;

    xmlDocPtr docPtr;

    const xmlChar *URL;

    ret = xmlTextReaderRead(readerPtr);

    while (ret == 1) {

      ret = xmlTextReaderRead(readerPtr);

    }

    /*

     * One can obtain the document pointer to get insteresting

     * information about the document like the URL, but one must also

     * be sure to clean it up at the end (see below).

     */

    docPtr = xmlTextReaderCurrentDoc(readerPtr);

    if (NULL == docPtr) {

      fprintf(stderr, "failed to obtain document\n");      

      return;

    }

    URL = docPtr->URL;

    if (NULL == URL) {

      fprintf(stderr, "Failed to obtain URL\n");      

    }

    if (ret != 0) {

      fprintf(stderr, "%s: Failed to parse\n", URL);

      return;

    }

    printf("%s: Processed ok\n", (const char *)URL);

}

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

    xmlTextReaderPtr readerPtr;

    int i;

    xmlDocPtr docPtr;

    if (argc < 2)

        return(1);

    /*

     * this initialises the library and check potential ABI mismatches

     * between the version it was compiled for and the actual shared

     * library used.

     */

    LIBXML_TEST_VERSION

    /*

     * Create a new reader for the first file and process the

     * document.

     */

    readerPtr = xmlReaderForFile(argv[1], NULL, 0);

    if (NULL == readerPtr) {

      fprintf(stderr, "%s: failed to create reader\n", argv[1]);      

      return(1);

    }

    processDoc(readerPtr);

    /*

     * The reader can be reused for subsequent files.

     */

    for (i=2; i < argc; ++i) {

      	xmlReaderNewFile(readerPtr, argv[i], NULL, 0);

	if (NULL == readerPtr) {

	  fprintf(stderr, "%s: failed to create reader\n", argv[i]);      

	  return(1);

	}

        processDoc(readerPtr);

    }

    /*

     * Since we've called xmlTextReaderCurrentDoc, we now have to

     * clean up after ourselves.  We only have to do this the last

     * time, because xmlReaderNewFile calls xmlCtxtReset which takes

     * care of it.

     */

    docPtr = xmlTextReaderCurrentDoc(readerPtr);

    if (docPtr != NULL)

      xmlFreeDoc(docPtr);

    /*

     * Clean up the reader.

     */

    xmlFreeTextReader(readerPtr);

    /*

     * Cleanup function for the XML library.

     */

    xmlCleanupParser();

    /*

     * this is to debug memory for regression tests

     */

    xmlMemoryDump();

    return(0);

}

#else

int main(void) {

    fprintf(stderr, "xmlReader support not compiled in\n");

    exit(1);

}

#endif