/**
 * dfun.c
 *   Some experimental fun with dbus (or at least dbus-style xml).
 */

// +-------+----------------------------------------------------------
// | Notes |
// +-------+

/*
  This is essentially me just playing with how I might parse the XML
  to find out things about the interface.
 */


// +---------+--------------------------------------------------------
// | Headers |
// +---------+

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>


// +-----------+------------------------------------------------------
// | Constants |
// +-----------+

/**
 * The default size of buffers.
 */
#define DEFAULT_BUFFER_SIZE 32


// +-------+----------------------------------------------------------
// | Types |
// +-------+

/**
 * 
 */


// +---------+--------------------------------------------------------
// | Helpers |
// +---------+

/**
 * Find the next tag in a file.  Returns a string that represents
 * the tag.  That string may change in future calls to xml_file_next_tag,
 * so you should make sure to copy it into a new structure if you need
 * it in the future.
 * Returns NULL if no tag is found.
 */
char *
xml_file_next_tag (FILE *fp)
{
  static gchar *buffer = NULL;        // Buffer used for reading strings
  static gint bufsize = 0;            // Size of that buffer. 
  static gchar ch;                    // Character read
  static gint i = 0;                  // Index into buffer

  // Make sure that we have a buffer
  if (buffer == NULL)
    {
      buffer = g_try_malloc (sizeof (gchar) * DEFAULT_BUFFER_SIZE);
      if (buffer == NULL)
        return NULL;
      bufsize = DEFAULT_BUFFER_SIZE;
    }

  // Read until we hit the opening '<' or end of file
  while (((ch = getc (fp)) != '\0') && (ch != '<'))
    ;

  // If we've hit the end of file, give up
  if (ch == '\0')
    return NULL;

  // Read the remaining characters
  // FORTHCOMING

  return buffer;
} // xml_file_next_tag

/**
 * Find the next tag in a string.  Sets startp and endp to the 
 * beginning and end of that tag (if found).  Returns 1 if 
 * found, and 0 if not found.
 *
 * Hack: Assumes no > signs appear within the tag.
 */
char *
xml_str_next_tag (const gchar *str, char **startp, char **endp)
{
  // Find the start of the tag.
  char *start = strchr (str, '<');
  if (start == NULL)
    return 0;
  
  // Find the end of the tag
  char *end = strchr (start, ">");
  if (end == 0)
    return 0;

  // Return the information
  *startp = start;
  *endp = end;
  return 1;
} // xml_str_next_tag

// +------+-----------------------------------------------------------
// | Main |
// +------+

int
main (int argc, char **argv)
{
  char *contents;
  gsize length;
  GError *error;

  // Read the file
  if (! g_file_get_contents ("summary.xml", &contents, &length, &error))
    {
      g_fprintf (stderr, "Error! %s.\n", error->message);
      return 1;
    }

  // Print it out
  g_printf ("%s", contents);

  // And we're done
  return 0;
} // main