+++ /dev/null
-/*
- * Copyright (C) 2014 Jonathan Rajotte <jonathan.r.julien@gmail.com>
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- */
-
-/*
- * Usage: extract_xml [-v|-e] xml_path xpath_expression
- * Evaluate XPath expression and prints result node set.
- * args[1] path to the xml file
- * args[2] xpath expression to extract
- * If -e look if node exist return "true" else nothing
- * If -v is set the name of the node will appear with his value delimited by
- * a semicolon(;)
- * Ex:
- * Command:extract_xml ../file.xml /test/node/text()
- * Output:
- * a
- * b
- * c
- * With -v
- * node;a;
- * node;b;
- * node;c;
- */
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <libxml/tree.h>
-#include <libxml/parser.h>
-#include <libxml/xpath.h>
-#include <libxml/xpathInternals.h>
-#include <common/defaults.h>
-
-#if defined(LIBXML_XPATH_ENABLED)
-
-static int opt_verbose;
-static int node_exist;
-static bool result = false;
-
-/**
- * print_xpath_nodes:
- * nodes: the nodes set.
- * output: the output file handle.
- *
- * Print the node content to the file
- */
-static int print_xpath_nodes(xmlDocPtr doc, xmlNodeSetPtr nodes, FILE *output)
-{
- int ret = 0;
- int size;
- int i;
-
- xmlNodePtr cur;
- xmlChar *node_child_value_string = NULL;
-
- LTTNG_ASSERT(output);
- size = (nodes) ? nodes->nodeNr : 0;
-
- for (i = 0; i < size; ++i) {
- LTTNG_ASSERT(nodes->nodeTab[i]);
-
- if (nodes->nodeTab[i]->type == XML_NAMESPACE_DECL) {
- fprintf(stderr, "ERR:%s\n",
- "This executable does not support xml namespacing\n");
- ret = -1;
- goto end;
- } else if (nodes->nodeTab[i]->type == XML_ELEMENT_NODE) {
- cur = nodes->nodeTab[i];
-
- if (xmlChildElementCount(cur) == 0) {
- if (xmlNodeIsText(cur->children)) {
- node_child_value_string = xmlNodeListGetString(doc,
- cur->children, 1);
- if (node_exist) {
- result = true;
- } else if (opt_verbose) {
- fprintf(output, "%s;%s;\n", cur->name,
- node_child_value_string);
- } else {
- fprintf(output, "%s\n",
- node_child_value_string);
- }
- xmlFree(node_child_value_string);
- } else {
- /* We don't want to print non-final element */
- if (node_exist) {
- result = true;
- } else {
- fprintf(stderr, "ERR:%s\n",
- "Xpath expression return non-final xml element");
- ret = -1;
- goto end;
- }
- }
- } else {
- if (node_exist) {
- result = true;
- } else {
- /* We don't want to print non-final element */
- fprintf(stderr, "ERR:%s\n",
- "Xpath expression return non-final xml element");
- ret = -1;
- goto end;
- }
- }
-
- } else {
- cur = nodes->nodeTab[i];
- if (node_exist) {
- result = true;
- } else if (opt_verbose) {
- fprintf(output, "%s;%s;\n", cur->parent->name, cur->content);
- } else {
- fprintf(output, "%s\n", cur->content);
- }
- }
- }
- /* Command Success */
- ret = 0;
-
-end:
- return ret;
-}
-
-static int register_lttng_namespace(xmlXPathContextPtr xpathCtx)
-{
- int ret;
- xmlChar *prefix;
- xmlChar *ns = NULL;
-
- prefix = xmlCharStrdup("lttng");
- if (!prefix) {
- ret = -1;
- goto end;
- }
-
- ns = xmlCharStrdup(DEFAULT_LTTNG_MI_NAMESPACE);
- if (!ns) {
- ret = -1;
- goto end;
- }
-
- ret = xmlXPathRegisterNs(xpathCtx, prefix, ns);
-end:
- xmlFree(prefix);
- xmlFree(ns);
- return ret;
-}
-
-/*
- * Extract element corresponding to xpath
- * xml_path The path to the xml file
- * xpath: The xpath to evaluate.
- *
- * Evaluate an xpath expression onto an xml file.
- * and print the result one by line.
- *
- * Returns 0 on success and a negative value otherwise.
- */
-static int extract_xpath(const char *xml_path, const xmlChar *xpath)
-{
- int ret;
- xmlDocPtr doc = NULL;
- xmlXPathContextPtr xpathCtx = NULL;
- xmlXPathObjectPtr xpathObj = NULL;
-
- LTTNG_ASSERT(xml_path);
- LTTNG_ASSERT(xpath);
-
- /* Parse the xml file */
- doc = xmlParseFile(xml_path);
- if (!doc) {
- fprintf(stderr, "ERR parsing: xml file invalid \"%s\"\n", xml_path);
- return -1;
- }
-
- /* Initialize a xpath context */
- xpathCtx = xmlXPathNewContext(doc);
- if (!xpathCtx) {
- fprintf(stderr, "ERR: XPath context invalid\n");
- xmlFreeDoc(doc);
- return -1;
- }
-
- /* Register the LTTng MI namespace */
- ret = register_lttng_namespace(xpathCtx);
- if (ret) {
- fprintf(stderr, "ERR: Could not register lttng namespace\n");
- xmlXPathFreeContext(xpathCtx);
- xmlFreeDoc(doc);
- return -1;
- }
-
- /* Evaluate xpath expression */
- xpathObj = xmlXPathEvalExpression(xpath, xpathCtx);
- if (!xpathObj) {
- fprintf(stderr, "ERR: invalid xpath expression \"%s\"\n", xpath);
- xmlXPathFreeContext(xpathCtx);
- xmlFreeDoc(doc);
- return -1;
- }
-
- /* Print results */
- if (print_xpath_nodes(doc, xpathObj->nodesetval, stdout)) {
- xmlXPathFreeObject(xpathObj);
- xmlXPathFreeContext(xpathCtx);
- xmlFreeDoc(doc);
- return -1;
- }
- if (node_exist && result) {
- fprintf(stdout, "true\n");
- }
-
- /* Cleanup */
- xmlXPathFreeObject(xpathObj);
- xmlXPathFreeContext(xpathCtx);
- xmlFreeDoc(doc);
-
- return 0;
-}
-
-int main(int argc, char **argv)
-{
- int opt;
-
- /* Parse command line and process file */
- while ((opt = getopt(argc, argv, "ve")) != -1) {
- switch (opt) {
- case 'v':
- opt_verbose = 1;
- break;
- case 'e':
- node_exist = 1;
- break;
- default:
- abort();
- }
- }
-
- if (!(optind + 1 < argc)) {
- fprintf(stderr, "ERR:%s\n", "Arguments missing");
- return -1;
- }
-
- /* Init libxml */
- xmlInitParser();
- xmlKeepBlanksDefault(0);
- if (access(argv[optind], F_OK)) {
- fprintf(stderr, "ERR:%s\n", "Xml path not valid");
- return -1;
- }
- /* Do the main job */
- if (extract_xpath(argv[optind], (xmlChar *)argv[optind+1])) {
- return -1;
- }
-
- /* Shutdown libxml */
- xmlCleanupParser();
-
- return 0;
-}
-
-#else
-int main(void)
-{
- fprintf(stderr, "XPath support not compiled in\n");
- return -1;
-}
-#endif
projects / lttng-tools.git / blobdiff