kc3-lang/libxml2/doc/examples/tree1.c

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• Hash : fc119e32
  Author :
  Date : 2023-04-30T15:28:12
  

  examples: Don't call xmlCleanupParser and xmlMemoryDump
  
  xmlCleanupParser is dangerous and shouldn't be called in most cases.
  Being part of the examples led many people to use it incorrectly.
  
  xmlMemoryDump is an obsolete way to test for memory leaks.
  

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• doc/examples/tree1.c

• /**
   * section: Tree
   * synopsis: Navigates a tree to print element names
   * purpose: Parse a file to a tree, use xmlDocGetRootElement() to
   *          get the root element, then walk the document and print
   *          all the element name in document order.
   * usage: tree1 filename_or_URL
   * test: tree1 test2.xml > tree1.tmp && diff tree1.tmp $(srcdir)/tree1.res
   * author: Dodji Seketeli
   * copy: see Copyright for the status of this software.
   */
  #include <stdio.h>
  #include <libxml/parser.h>
  #include <libxml/tree.h>
  
  #ifdef LIBXML_TREE_ENABLED
  
  /*
   *To compile this file using gcc you can type
   *gcc `xml2-config --cflags --libs` -o xmlexample libxml2-example.c
   */
  
  /**
   * print_element_names:
   * @a_node: the initial xml node to consider.
   *
   * Prints the names of the all the xml elements
   * that are siblings or children of a given xml node.
   */
  static void
  print_element_names(xmlNode * a_node)
  {
      xmlNode *cur_node = NULL;
  
      for (cur_node = a_node; cur_node; cur_node = cur_node->next) {
          if (cur_node->type == XML_ELEMENT_NODE) {
              printf("node type: Element, name: %s\n", cur_node->name);
          }
  
          print_element_names(cur_node->children);
      }
  }
  
  
  /**
   * Simple example to parse a file called "file.xml", 
   * walk down the DOM, and print the name of the 
   * xml elements nodes.
   */
  int
  main(int argc, char **argv)
  {
      xmlDoc *doc = NULL;
      xmlNode *root_element = NULL;
  
      if (argc != 2)
          return(1);
  
      /*
       * this initialize the library and check potential ABI mismatches
       * between the version it was compiled for and the actual shared
       * library used.
       */
      LIBXML_TEST_VERSION
  
      /*parse the file and get the DOM */
      doc = xmlReadFile(argv[1], NULL, 0);
  
      if (doc == NULL) {
          printf("error: could not parse file %s\n", argv[1]);
      }
  
      /*Get the root element node */
      root_element = xmlDocGetRootElement(doc);
  
      print_element_names(root_element);
  
      /*free the document */
      xmlFreeDoc(doc);
  
      return 0;
  }
  #else
  int main(void) {
      fprintf(stderr, "Tree support not compiled in\n");
      return 0;
  }
  #endif
  

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