/* Copyright (c) 2019 Pigeonhole authors, see the included COPYING file */

#include "lib.h"

#include "imap-arg.h"

#include "ext-special-use-common.h"

bool ext_special_use_flag_valid(const char *flag)

{

  const char *p = flag;

  /* RFC 6154, Section 6:

     use-attr        =  "\All" / "\Archive" / "\Drafts" / "\Flagged" /

                        "\Junk" / "\Sent" / "\Trash" / use-attr-ext

     use-attr-ext    =  "\" atom

   */

  /* "\" */

  if (*p != '\\')

    return FALSE;

  p++;

  /* atom */

  for (; *p != '\0'; p++) {

    if (!IS_ATOM_CHAR(*p))

      return FALSE;

  }

  return TRUE;

}