/** * apr tutorial sample code * http://dev.ariel-networks.com/apr/ */#ifdef HAVE_CONFIG_H#include <config.h>#endif#include <stdio.h>#include <stdlib.h>#include <assert.h>#include <apr_general.h>#include <apr_file_io.h>#include <apr_xml.h>static apr_status_t make_xml_doc(apr_xml_doc **doc, const char *fname, apr_pool_t *mp);static apr_status_t traverse_xml_tree(const apr_xml_elem *root, apr_pool_t *mp);/** * apr-xml sample code * @remark Error checks omitted */int main(int argc, const char *argv[]){    apr_status_t rv;    apr_pool_t *mp;    apr_xml_doc *doc;    apr_xml_elem *root;    const char *fname;            if (argc < 2) {        printf("usage %s input-xml-filename\n", argv[0]);        return 0;    }    fname = argv[1];    apr_initialize();    apr_pool_create(&mp, NULL);    /* This is similar to creating an XML DOM tree, although apr_xml_doc is not a DOM */    rv = make_xml_doc(&doc, fname, mp);    if (rv != APR_SUCCESS) {        return -1;    }    root = doc->root;    printf("root-element; name = %s, text = %s\n", root->name, root->first_cdata.first->text);    traverse_xml_tree(root, mp);    apr_terminate();    return 0;}static apr_status_t make_xml_doc(apr_xml_doc **doc, const char *fname, apr_pool_t *mp){    apr_xml_parser *parser = apr_xml_parser_create(mp);    apr_status_t rv;    apr_file_t *fp;        rv = apr_file_open(&fp, fname, APR_READ|APR_BINARY, 0, mp);    if (rv != APR_SUCCESS) {        return rv;    }    while (1) {#define BUFSIZE		1024        char buf[BUFSIZE];        apr_size_t len = sizeof(buf);        rv = apr_file_read(fp, buf, &len);        if (rv == APR_SUCCESS && len) {            apr_status_t rv2 = apr_xml_parser_feed(parser, buf, len);            if (rv2 != APR_SUCCESS) {                char err[128];                apr_xml_parser_geterror(parser, err, sizeof(err));                printf("rv2 = %s\n", err);                return rv2;            }        } else {            break;        }    }    apr_file_close(fp);    apr_xml_parser_done(parser, doc);    return APR_SUCCESS;}static apr_status_t traverse_xml_tree(const apr_xml_elem *root, apr_pool_t *mp){    const apr_xml_elem *elem;        for (elem = root->first_child; elem; elem = elem->next) {        const apr_xml_attr *attr;        printf("name = %s, text = %s\n", elem->name, elem->first_cdata.first->text);        printf("following_cdata = %s\n", elem->following_cdata.first->text);        if (elem->first_child) {            const apr_xml_elem *fel = elem->first_child;            const apr_xml_elem *lel = elem->last_child;                        printf("first_child:name=%s,text=%s\n", fel->name, fel->first_cdata.first->text);            printf("last_child:name=%s,text=%s\n", lel->name, lel->first_cdata.first->text);        }        for (attr = elem->attr; attr; attr = attr->next) {            printf("attr: name = %s, text = %s\n", attr->name, attr->value);        }    }        return APR_SUCCESS;}