libxml_io1.c 翻譯

#include <stdio.h>

#include <string.h>

#include <libxml/parser.h>

#include <libxml/tree.h>

#include <libxml/xinclude.h>

#include <libxml/xmlIO.h>

#ifdef LIBXML_XINCLUDE_ENABLED

static const char *result = "<list><people>a</people><people>b</people></list>";

static const char *cur = NULL;

static int rlen;

static int

sqlMatch(const char * URI) {

    if ((URI != NULL) && (!strncmp(URI, "sql:", 4)))

        return(1);

    return(0);

}

static void *

sqlOpen(const char * URI) {

    if ((URI == NULL) || (strncmp(URI, "sql:", 4)))

        return(NULL);

    cur = result;

    rlen = strlen(result);

    return((void *) cur);

}

static int

sqlClose(void * context) {

    if (context == NULL) return(-1);

    cur = NULL;

    rlen = 0;

    return(0);

}

static int

sqlRead(void * context, char * buffer, int len) {

   const char *ptr = (const char *) context;

   if ((context == NULL) || (buffer == NULL) || (len < 0))

       return(-1);

   if (len > rlen) len = rlen;

   memcpy(buffer, ptr, len);

   rlen -= len;

   return(len);

}

const char *include = "<?xml version='1.0'?>\n\

<document xmlns:xi=\"http://www.w3.org/2003/XInclude\">\n\

  <p>List of people:</p>\n\

  <xi:include href=\"sql:select_name_from_people\"/>\n\

</document>\n";

int main(void) {

    xmlDocPtr doc;

    LIBXML_TEST_VERSION

    if (xmlRegisterInputCallbacks(sqlMatch, sqlOpen, sqlRead, sqlClose) < 0) {

        fprintf(stderr, "failed to register SQL handler\n");

exit(1);

    }

    doc = xmlReadMemory(include, strlen(include), "include.xml", NULL, 0);

    if (doc == NULL) {

        fprintf(stderr, "failed to parse the including file\n");

exit(1);

    }

    if (xmlXIncludeProcess(doc) <= 0) {

        fprintf(stderr, "XInclude processing failed\n");

exit(1);

    }

#ifdef LIBXML_OUTPUT_ENABLED

    xmlDocDump(stdout, doc);

#endif

    xmlFreeDoc(doc);

    xmlCleanupParser();

    xmlMemoryDump();

    return(0);

}

#else

int main(void) {

    fprintf(stderr, "XInclude support not compiled in\n");

    exit(1);

}

#endif