1  /**
       2   * section: xmlReader
       3   * synopsis: Parse multiple XML files reusing an xmlReader
       4   * purpose: Demonstrate the use of xmlReaderForFile() and
       5   * xmlReaderNewFile to parse XML files while reusing the reader object
       6   * and parser context.  (Note that the XMLReader functions require
       7   * libxml2 version later than 2.6.)
       8   * usage: reader4 <filename> [ filename ... ]
       9   * test: reader4 test1.xml test2.xml test3.xml > reader4.tmp && diff reader4.tmp $(srcdir)/reader4.res
      10   * author: Graham Bennett
      11   * copy: see Copyright for the status of this software.
      12   */
      13  
      14  #include <stdio.h>
      15  #include <libxml/xmlreader.h>
      16  
      17  #ifdef LIBXML_READER_ENABLED
      18  
      19  static void processDoc(xmlTextReaderPtr readerPtr) {
      20      int ret;
      21      xmlDocPtr docPtr;
      22      const xmlChar *URL;
      23  
      24      ret = xmlTextReaderRead(readerPtr);
      25      while (ret == 1) {
      26        ret = xmlTextReaderRead(readerPtr);
      27      }
      28  
      29      /*
      30       * One can obtain the document pointer to get interesting
      31       * information about the document like the URL, but one must also
      32       * be sure to clean it up at the end (see below).
      33       */
      34      docPtr = xmlTextReaderCurrentDoc(readerPtr);
      35      if (NULL == docPtr) {
      36        fprintf(stderr, "failed to obtain document\n");      
      37        return;
      38      }
      39        
      40      URL = docPtr->URL;
      41      if (NULL == URL) {
      42        fprintf(stderr, "Failed to obtain URL\n");      
      43      }
      44  
      45      if (ret != 0) {
      46        fprintf(stderr, "%s: Failed to parse\n", URL);
      47        return;
      48      }
      49  
      50      printf("%s: Processed ok\n", (const char *)URL);
      51  }
      52  
      53  int main(int argc, char **argv) {
      54      xmlTextReaderPtr readerPtr;
      55      int i;
      56      xmlDocPtr docPtr;
      57  
      58      if (argc < 2)
      59          return(1);
      60  
      61      /*
      62       * this initialises the library and check potential ABI mismatches
      63       * between the version it was compiled for and the actual shared
      64       * library used.
      65       */
      66      LIBXML_TEST_VERSION
      67  
      68      /*
      69       * Create a new reader for the first file and process the
      70       * document.
      71       */
      72      readerPtr = xmlReaderForFile(argv[1], NULL, 0);
      73      if (NULL == readerPtr) {
      74        fprintf(stderr, "%s: failed to create reader\n", argv[1]);      
      75        return(1);
      76      }
      77      processDoc(readerPtr);
      78  
      79      /*
      80       * The reader can be reused for subsequent files.
      81       */
      82      for (i=2; i < argc; ++i) {
      83        	xmlReaderNewFile(readerPtr, argv[i], NULL, 0);
      84  	if (NULL == readerPtr) {
      85  	  fprintf(stderr, "%s: failed to create reader\n", argv[i]);      
      86  	  return(1);
      87  	}
      88          processDoc(readerPtr);
      89      }
      90  
      91      /*
      92       * Since we've called xmlTextReaderCurrentDoc, we now have to
      93       * clean up after ourselves.  We only have to do this the last
      94       * time, because xmlReaderNewFile calls xmlCtxtReset which takes
      95       * care of it.
      96       */
      97      docPtr = xmlTextReaderCurrentDoc(readerPtr);
      98      if (docPtr != NULL)
      99        xmlFreeDoc(docPtr);
     100  
     101      /*
     102       * Clean up the reader.
     103       */
     104      xmlFreeTextReader(readerPtr);
     105  
     106      return(0);
     107  }
     108  
     109  #else
     110  int main(void) {
     111      fprintf(stderr, "xmlReader support not compiled in\n");
     112      return(0);
     113  }
     114  #endif