Mine

GSList *
log_read_dates (gchar **buffer_lines, time_t current)
{
   int offsetyear = 0, current_year;
   GSList *days = NULL, *days_copy;
   GDate *date, *newdate;
   struct tm *tmptm;
   gchar *date_string;
   Day *day;
   gboolean done = FALSE;
   int i, n, rangemin, rangemax;

   if (buffer_lines == NULL)
       return NULL;

   n = g_strv_length (buffer_lines);
   for (i=0; buffer_lines[i]==NULL; i++);

   tmptm = localtime (&current);
   current_year = tmptm->tm_year + 1900;

   for (i=0; buffer_lines[i]==NULL; i++);

   /* Start building the list */
   /* Scanning each line to see if the date changed is too slow, so we proceed
      in a recursive fashion */

   date = string_get_date (buffer_lines[i]);
   if ((date==NULL)|| !g_date_valid (date))
       return NULL;

   g_date_set_year (date, current_year);
   day = g_new (Day, 1);
   days = g_slist_append (days, day);

   day->date = date;
   day->first_line = i;
   day->last_line = -1;
   date_string = string_get_date_string (buffer_lines[i]);

   rangemin = 0;
   rangemax = n-1;

   while (!done) {
       
       i = n-1;
       while (day->last_line < 0) {

           if (g_str_has_prefix (buffer_lines[i], date_string)) {
               if (i == (n-1)) {
                   day->last_line = i;
                   done = TRUE;
                   break;
               } else {
                   if (!g_str_has_prefix (buffer_lines[i+1], date_string)) {
                       day->last_line = i;
                       break;
                   } else {
                       rangemin = i;
                       i = floor ( ((float) i + (float) rangemax)/2.);
                   }
               }
           } else {
               rangemax = i;
               i = floor (((float) rangemin + (float) i)/2.);               
           }

       }
       
       g_free (date_string);

       if (!done) {
         /* We need to find the first line now that has a date
            Logs can have some messages without dates ... */
         newdate = NULL;
         while (newdate == NULL && !done) {
           i++;
           date_string = string_get_date_string (buffer_lines[i]);
           if (date_string == NULL)
             continue;
           newdate = string_get_date (buffer_lines[i]);
           
           if (newdate == NULL && i==n-1)
             done = TRUE;
         }

         day->last_line = i-1;

         /* Append a day to the list */	
         if (newdate) {
           g_date_set_year (newdate, current_year + offsetyear);	
           if (g_date_compare (newdate, date) < 1) {
             offsetyear++; /* newdate is next year */
             g_date_add_years (newdate, 1);
           }
           
           date = newdate;
           day = g_new (Day, 1);
           days = g_slist_append (days, day);
           
           day->date = date;
           day->first_line = i;
           day->last_line = -1;
           rangemin = i;
           rangemax = n;
         }
       }
   }

   /* Correct years now. We assume that the last date on the log
      is the date last accessed */

   for (days_copy = days; days_copy != NULL; days_copy = g_slist_next (days_copy)) {       
       day = days_copy -> data;
       g_date_subtract_years (day->date, offsetyear);
   }
   
   /* Sort the days in chronological order */
   days = g_slist_sort (days, days_compare);

   return (days);
}