do_commands

ACMD(do_commands)
{
  int no, i, cmd_num;
  int wizhelp = 0, socials = 0;
  struct char_data *vict;
  char arg[MAX_INPUT_LENGTH];
  char buf[MAX_STRING_LENGTH];
  const char *commands[1000];
  int overflow = sizeof(commands) / sizeof(commands[0]);

  if (!ch->desc)
    return;

  one_argument(argument, arg);

  if (*arg) {
    if (!(vict = get_char_vis(ch, arg, NULL, FIND_CHAR_WORLD)) || IS_NPC(vict)) {
      send_to_char(ch, "Who is that?\r\n");
      return;
    }
  } else
    vict = ch;

  if (subcmd == SCMD_SOCIALS)
    socials = 1;
  else if (subcmd == SCMD_WIZHELP)
    wizhelp = 1;

  sprintf(buf, "The following %s%s are available to %s:\r\n",
          wizhelp ? "privileged " : "",
          socials ? "socials" : "commands",
          vict == ch ? "you" : GET_NAME(vict));

  /* cmd_num starts at 1, not 0, to remove 'RESERVED' */
  for (no = 0, cmd_num = 1;
       complete_cmd_info[cmd_sort_info[cmd_num]].command[0] != '\n';
       ++cmd_num) {

    i = cmd_sort_info[cmd_num];

    if (complete_cmd_info[i].minimum_level < 0 || GET_LEVEL(vict) < complete_cmd_info[i].minimum_level)
      continue;

    if ((complete_cmd_info[i].minimum_level >= LVL_IMMORT) != wizhelp)
      continue;

    if (!wizhelp && socials != (complete_cmd_info[i].command_pointer == do_action))
      continue;

    if (wizhelp && complete_cmd_info[i].command_pointer == do_action)
      continue;

    if (--overflow < 0)
      continue;

    /* matching command: copy to commands list */
    commands[no++] = complete_cmd_info[i].command;
  }

  /* display commands list in a nice columnized format */
  column_list(ch, 0, commands, no, FALSE);
}

void column_list(struct char_data *ch, int num_cols, const char **list, int list_length, bool show_nums)
{
   size_t max_len = 0, len = 0, temp_len;
   int num_per_col, col_width, r, c, i, offset = 0;
   char buf[MAX_STRING_LENGTH];

   /* Work out the longest list item */
   for (i=0; i<list_length; i++)
     if (max_len < strlen(list[i]))
       max_len = strlen(list[i]);

   /* auto columns case */
   if (num_cols == 0) {
	   num_cols = (IS_NPC(ch) ? 80 : GET_SCREEN_WIDTH(ch)) / (max_len + (show_nums ? 5 : 1));
   }

   /* Ensure that the number of columns is in the range 1-10 */
   num_cols = MIN(MAX(num_cols,1), 10);

   /* Work out the longest list item */
   for (i=0; i<list_length; i++)
     if (max_len < strlen(list[i]))
       max_len = strlen(list[i]);

   /* Calculate the width of each column */
   if (IS_NPC(ch))   col_width = 80 / num_cols;
   else              col_width = (GET_SCREEN_WIDTH(ch)) / num_cols;

   if (show_nums) col_width-=4;

   if (col_width < 0 || (size_t)col_width < max_len)
     log("Warning: columns too narrow for correct output to %s in simple_column_list (utils.c)", GET_NAME(ch));

   /* Calculate how many list items there should be per column */
   num_per_col = (list_length / num_cols) + ((list_length % num_cols) ? 1 : 0);

   /* Fill 'buf' with the columnised list */
   for (r=0; r<num_per_col; r++)
   {
     for (c=0; c<num_cols; c++)
     {
       offset = (c*num_per_col)+r;
       if (offset < list_length)
       {
         if (show_nums)
           temp_len = snprintf(buf+len, sizeof(buf) - len, "%2d) %-*s", offset+1, col_width, list[(offset)]);
         else
           temp_len = snprintf(buf+len, sizeof(buf) - len, "%-*s", col_width, list[(offset)]);
         len += temp_len;
       }
     }
     temp_len = snprintf(buf+len, sizeof(buf) - len, "\r\n");
     len += temp_len;
   }

   if (len >= sizeof(buf))
     snprintf((buf + MAX_STRING_LENGTH) - 22, 22, "\r\n*** OVERFLOW ***\r\n");

   /* Send the list to the player */
   page_string(ch->desc, buf, TRUE);
}

   char buf[MAX_STRING_LENGTH];
  
+    *buf='\0';
   /* Work out the longest list item */