release/src/router/libxml2/doc/examples/tree1.c

   1 /**
   2  * section: Tree
   3  * synopsis: Navigates a tree to print element names
   4  * purpose: Parse a file to a tree, use xmlDocGetRootElement() to
   5  *          get the root element, then walk the document and print
   6  *          all the element name in document order.
   7  * usage: tree1 filename_or_URL
   8  * test: tree1 test2.xml > tree1.tmp && diff tree1.tmp $(srcdir)/tree1.res
   9  * author: Dodji Seketeli
  10  * copy: see Copyright for the status of this software.
  11  */
  12 #include <stdio.h>
  13 #include <libxml/parser.h>
  14 #include <libxml/tree.h>
  15
  16 #ifdef LIBXML_TREE_ENABLED
  17
  18 /*
  19  *To compile this file using gcc you can type
  20  *gcc `xml2-config --cflags --libs` -o xmlexample libxml2-example.c
  21  */
  22
  23 /**
  24  * print_element_names:
  25  * @a_node: the initial xml node to consider.
  26  *
  27  * Prints the names of the all the xml elements
  28  * that are siblings or children of a given xml node.
  29  */
  30 static void
  31 print_element_names(xmlNode * a_node)
  32 {
  33     xmlNode *cur_node = NULL;
  34
  35     for (cur_node = a_node; cur_node; cur_node = cur_node->next) {
  36         if (cur_node->type == XML_ELEMENT_NODE) {
  37             printf("node type: Element, name: %s\n", cur_node->name);
  38         }
  39
  40         print_element_names(cur_node->children);
  41     }
  42 }
  43
  44
  45 /**
  46  * Simple example to parse a file called "file.xml",
  47  * walk down the DOM, and print the name of the
  48  * xml elements nodes.
  49  */
  50 int
  51 main(int argc, char **argv)
  52 {
  53     xmlDoc *doc = NULL;
  54     xmlNode *root_element = NULL;
  55
  56     if (argc != 2)
  57         return(1);
  58
  59     /*
  60      * this initialize the library and check potential ABI mismatches
  61      * between the version it was compiled for and the actual shared
  62      * library used.
  63      */
  64     LIBXML_TEST_VERSION
  65
  66     /*parse the file and get the DOM */
  67     doc = xmlReadFile(argv[1], NULL, 0);
  68
  69     if (doc == NULL) {
  70         printf("error: could not parse file %s\n", argv[1]);
  71     }
  72
  73     /*Get the root element node */
  74     root_element = xmlDocGetRootElement(doc);
  75
  76     print_element_names(root_element);
  77
  78     /*free the document */
  79     xmlFreeDoc(doc);
  80
  81     /*
  82      *Free the global variables that may
  83      *have been allocated by the parser.
  84      */
  85     xmlCleanupParser();
  86
  87     return 0;
  88 }
  89 #else
  90 int main(void) {
  91     fprintf(stderr, "Tree support not compiled in\n");
  92     exit(1);
  93 }
  94 #endif