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Diffstat (limited to 'gtk+-mingw/share/doc/libxml2-2.8.0/html/xpath2.c')
| -rw-r--r-- | gtk+-mingw/share/doc/libxml2-2.8.0/html/xpath2.c | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/gtk+-mingw/share/doc/libxml2-2.8.0/html/xpath2.c b/gtk+-mingw/share/doc/libxml2-2.8.0/html/xpath2.c deleted file mode 100644 index 6ff4008..0000000 --- a/gtk+-mingw/share/doc/libxml2-2.8.0/html/xpath2.c +++ /dev/null @@ -1,190 +0,0 @@ -/** - * section: XPath - * synopsis: Load a document, locate subelements with XPath, modify - * said elements and save the resulting document. - * purpose: Shows how to make a full round-trip from a load/edit/save - * usage: xpath2 <xml-file> <xpath-expr> <new-value> - * test: xpath2 test3.xml '//discarded' discarded > xpath2.tmp ; diff xpath2.tmp xpath2.res ; rm xpath2.tmp - * author: Aleksey Sanin and Daniel Veillard - * copy: see Copyright for the status of this software. - */ -#include <stdlib.h> -#include <stdio.h> -#include <string.h> -#include <assert.h> - -#include <libxml/tree.h> -#include <libxml/parser.h> -#include <libxml/xpath.h> -#include <libxml/xpathInternals.h> - -#if defined(LIBXML_XPATH_ENABLED) && defined(LIBXML_SAX1_ENABLED) && \ - defined(LIBXML_OUTPUT_ENABLED) - - -static void usage(const char *name); -static int example4(const char *filename, const xmlChar * xpathExpr, - const xmlChar * value); -static void update_xpath_nodes(xmlNodeSetPtr nodes, const xmlChar * value); - - -int -main(int argc, char **argv) { - /* Parse command line and process file */ - if (argc != 4) { - fprintf(stderr, "Error: wrong number of arguments.\n"); - usage(argv[0]); - return(-1); - } - - /* Init libxml */ - xmlInitParser(); - LIBXML_TEST_VERSION - - /* Do the main job */ - if (example4(argv[1], BAD_CAST argv[2], BAD_CAST argv[3])) { - usage(argv[0]); - return(-1); - } - - /* Shutdown libxml */ - xmlCleanupParser(); - - /* - * this is to debug memory for regression tests - */ - xmlMemoryDump(); - return 0; -} - -/** - * usage: - * @name: the program name. - * - * Prints usage information. - */ -static void -usage(const char *name) { - assert(name); - - fprintf(stderr, "Usage: %s <xml-file> <xpath-expr> <value>\n", name); -} - -/** - * example4: - * @filename: the input XML filename. - * @xpathExpr: the xpath expression for evaluation. - * @value: the new node content. - * - * Parses input XML file, evaluates XPath expression and update the nodes - * then print the result. - * - * Returns 0 on success and a negative value otherwise. - */ -static int -example4(const char* filename, const xmlChar* xpathExpr, const xmlChar* value) { - xmlDocPtr doc; - xmlXPathContextPtr xpathCtx; - xmlXPathObjectPtr xpathObj; - - assert(filename); - assert(xpathExpr); - assert(value); - - /* Load XML document */ - doc = xmlParseFile(filename); - if (doc == NULL) { - fprintf(stderr, "Error: unable to parse file \"%s\"\n", filename); - return(-1); - } - - /* Create xpath evaluation context */ - xpathCtx = xmlXPathNewContext(doc); - if(xpathCtx == NULL) { - fprintf(stderr,"Error: unable to create new XPath context\n"); - xmlFreeDoc(doc); - return(-1); - } - - /* Evaluate xpath expression */ - xpathObj = xmlXPathEvalExpression(xpathExpr, xpathCtx); - if(xpathObj == NULL) { - fprintf(stderr,"Error: unable to evaluate xpath expression \"%s\"\n", xpathExpr); - xmlXPathFreeContext(xpathCtx); - xmlFreeDoc(doc); - return(-1); - } - - /* update selected nodes */ - update_xpath_nodes(xpathObj->nodesetval, value); - - - /* Cleanup of XPath data */ - xmlXPathFreeObject(xpathObj); - xmlXPathFreeContext(xpathCtx); - - /* dump the resulting document */ - xmlDocDump(stdout, doc); - - - /* free the document */ - xmlFreeDoc(doc); - - return(0); -} - -/** - * update_xpath_nodes: - * @nodes: the nodes set. - * @value: the new value for the node(s) - * - * Prints the @nodes content to @output. - */ -static void -update_xpath_nodes(xmlNodeSetPtr nodes, const xmlChar* value) { - int size; - int i; - - assert(value); - size = (nodes) ? nodes->nodeNr : 0; - - /* - * NOTE: the nodes are processed in reverse order, i.e. reverse document - * order because xmlNodeSetContent can actually free up descendant - * of the node and such nodes may have been selected too ! Handling - * in reverse order ensure that descendant are accessed first, before - * they get removed. Mixing XPath and modifications on a tree must be - * done carefully ! - */ - for(i = size - 1; i >= 0; i--) { - assert(nodes->nodeTab[i]); - - xmlNodeSetContent(nodes->nodeTab[i], value); - /* - * All the elements returned by an XPath query are pointers to - * elements from the tree *except* namespace nodes where the XPath - * semantic is different from the implementation in libxml2 tree. - * As a result when a returned node set is freed when - * xmlXPathFreeObject() is called, that routine must check the - * element type. But node from the returned set may have been removed - * by xmlNodeSetContent() resulting in access to freed data. - * This can be exercised by running - * valgrind xpath2 test3.xml '//discarded' discarded - * There is 2 ways around it: - * - make a copy of the pointers to the nodes from the result set - * then call xmlXPathFreeObject() and then modify the nodes - * or - * - remove the reference to the modified nodes from the node set - * as they are processed, if they are not namespace nodes. - */ - if (nodes->nodeTab[i]->type != XML_NAMESPACE_DECL) - nodes->nodeTab[i] = NULL; - } -} - -#else -int main(void) { - fprintf(stderr, "XPath support not compiled in\n"); - exit(1); -} -#endif |