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 insteresting
 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      /*
107       * Cleanup function for the XML library.
108       */
109      xmlCleanupParser();
110      /*
111       * this is to debug memory for regression tests
112       */
113      xmlMemoryDump();
114      return(0);
115  }
116  
117  #else
118  int main(void) {
119      fprintf(stderr, "xmlReader support not compiled in\n");
120      exit(1);
121  }
122  #endif