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https://gitlab.gnome.org/GNOME/libxml2
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fc119e3290
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.
112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
/**
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* section: xmlReader
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* synopsis: Show how to extract subdocuments with xmlReader
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* purpose: Demonstrate the use of xmlTextReaderPreservePattern()
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* to parse an XML file with the xmlReader while collecting
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* only some subparts of the document.
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* (Note that the XMLReader functions require libxml2 version later
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* than 2.6.)
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* usage: reader3
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* test: reader3 > reader3.tmp && diff reader3.tmp $(srcdir)/reader3.res
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* author: Daniel Veillard
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* copy: see Copyright for the status of this software.
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*/
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#include <stdio.h>
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#include <libxml/xmlreader.h>
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#if defined(LIBXML_READER_ENABLED) && defined(LIBXML_PATTERN_ENABLED) && defined(LIBXML_OUTPUT_ENABLED)
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/**
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* streamFile:
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* @filename: the file name to parse
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*
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* Parse and print information about an XML file.
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*
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* Returns the resulting doc with just the elements preserved.
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*/
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static xmlDocPtr
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extractFile(const char *filename, const xmlChar *pattern) {
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xmlDocPtr doc;
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xmlTextReaderPtr reader;
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int ret;
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/*
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* build an xmlReader for that file
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*/
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reader = xmlReaderForFile(filename, NULL, 0);
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if (reader != NULL) {
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/*
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* add the pattern to preserve
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*/
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if (xmlTextReaderPreservePattern(reader, pattern, NULL) < 0) {
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fprintf(stderr, "%s : failed add preserve pattern %s\n",
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filename, (const char *) pattern);
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}
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/*
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* Parse and traverse the tree, collecting the nodes in the process
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*/
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ret = xmlTextReaderRead(reader);
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while (ret == 1) {
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ret = xmlTextReaderRead(reader);
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}
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if (ret != 0) {
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fprintf(stderr, "%s : failed to parse\n", filename);
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xmlFreeTextReader(reader);
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return(NULL);
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}
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/*
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* get the resulting nodes
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*/
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doc = xmlTextReaderCurrentDoc(reader);
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/*
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* Free up the reader
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*/
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xmlFreeTextReader(reader);
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} else {
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fprintf(stderr, "Unable to open %s\n", filename);
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return(NULL);
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}
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return(doc);
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}
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int main(int argc, char **argv) {
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const char *filename = "test3.xml";
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const char *pattern = "preserved";
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xmlDocPtr doc;
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if (argc == 3) {
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filename = argv[1];
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pattern = argv[2];
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}
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/*
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* this initialize the library and check potential ABI mismatches
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* between the version it was compiled for and the actual shared
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* library used.
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*/
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LIBXML_TEST_VERSION
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doc = extractFile(filename, (const xmlChar *) pattern);
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if (doc != NULL) {
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/*
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* output the result.
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*/
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xmlDocDump(stdout, doc);
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/*
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* don't forget to free up the doc
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*/
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xmlFreeDoc(doc);
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}
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return(0);
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}
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#else
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int main(void) {
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fprintf(stderr, "Reader, Pattern or output support not compiled in\n");
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return(0);
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}
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#endif
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