kc3-lang/libxml2/example/reader4.c

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• Hash : d381e5de
  Author :
  Date : 2024-04-28T21:14:32
  

  doc: Move doc/examples to example
  

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• example/reader4.c

• /**
   * 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 interesting
       * 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);
  
      return(0);
  }
  
  #else
  int main(void) {
      fprintf(stderr, "xmlReader support not compiled in\n");
      return(0);
  }
  #endif
  

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