test_elements.c

#include <stdio.h>
#include <expat.h>

static void XMLCALL
startElement(void *userData, const XML_Char *name, const XML_Char **atts)
{
  int i;
  int *depthPtr = (int *)userData;
  (void)atts;

  for (i = 0; i < *depthPtr; i++)
    putchar('\t');
  printf("%s\n", name);
  *depthPtr += 1;
}

static void XMLCALL
endElement(void *userData, const XML_Char *name)
{
  int *depthPtr = (int *)userData;
  (void)name;

  *depthPtr -= 1;
}

static void XMLCALL
characterData(void *userData, const XML_Char *str, int len)
{
  int *depthPtr = (int *)userData;
  fwrite(str, 1, len, stdout);
}

int
main(int argc, char *argv[])
{
  char buf[BUFSIZ];
  XML_Parser parser = XML_ParserCreate(NULL);
  int done;
  int depth = 0;
  (void)argc;
  (void)argv;

  XML_SetUserData(parser, &depth);
  XML_SetElementHandler(parser, startElement, endElement);
  XML_SetCharacterDataHandler(parser, characterData);
  do {
    size_t len = fread(buf, 1, sizeof(buf), stdin);
    done = len < sizeof(buf);
    if (XML_Parse(parser, buf, (int)len, done) == XML_STATUS_ERROR) {
      fprintf(stderr, "%s at line %lu\n",
              XML_ErrorString(XML_GetErrorCode(parser)),
              XML_GetCurrentLineNumber(parser));
      return 1;
    }
  } while (!done);
  XML_ParserFree(parser);
  return 0;
}