src/expat/examples/elements.c

   1 /* This is simple demonstration of how to use expat. This program
   2    reads an XML document from standard input and writes a line with
   3    the name of each element to standard output indenting child
   4    elements by one tab stop more than their parent element.
   5 */
   6
   7 #include <stdio.h>
   8 #include "expat.h"
   9
  10 static void
  11 startElement(void *userData, const char *name, const char **atts)
  12 {
  13   int i;
  14   int *depthPtr = userData;
  15   for (i = 0; i < *depthPtr; i++)
  16     putchar('\t');
  17   puts(name);
  18   *depthPtr += 1;
  19 }
  20
  21 static void
  22 endElement(void *userData, const char *name)
  23 {
  24   int *depthPtr = userData;
  25   *depthPtr -= 1;
  26 }
  27
  28 int
  29 main(int argc, char *argv[])
  30 {
  31   char buf[BUFSIZ];
  32   XML_Parser parser = XML_ParserCreate(NULL);
  33   int done;
  34   int depth = 0;
  35   XML_SetUserData(parser, &depth);
  36   XML_SetElementHandler(parser, startElement, endElement);
  37   do {
  38     size_t len = fread(buf, 1, sizeof(buf), stdin);
  39     done = len < sizeof(buf);
  40     if (XML_Parse(parser, buf, len, done) == XML_STATUS_ERROR) {
  41       fprintf(stderr,
  42               "%s at line %d\n",
  43               XML_ErrorString(XML_GetErrorCode(parser)),
  44               XML_GetCurrentLineNumber(parser));
  45       return 1;
  46     }
  47   } while (!done);
  48   XML_ParserFree(parser);
  49   return 0;
  50 }