text: /* aliasbr.h -- definitions for the aliasing system
   *
   */
  
  extern char *AliasFile;		/* mh-alias(5)             */
  
  struct aka {
      char *ak_name;		/* name to match against             */
      struct adr *ak_addr;	/* list of addresses that it maps to */
      struct aka *ak_next;	/* next aka in list                  */
      bool ak_visible;		/* should be visible in headers      */
  };
  
  struct adr {
      char *ad_text;		/* text of this address in list        */
      struct adr *ad_next;	/* next adr in list                    */
      char ad_local;		/* text is local (check for expansion) */
  };
  
  /*
   * prototypes
   */
  int alias (char *);
  int akvisible (void) PURE;
  char *akresult (struct aka *);
  char *akvalue (char *);
  char *akerror (int);
  
  /* codes returned by alias() */
  
  #define	AK_OK		0	/* file parsed OK	 */
  #define	AK_NOFILE	1	/* couldn't read file	 */
  #define	AK_ERROR	2	/* error parsing file	 */
  #define	AK_LIMIT	3	/* memory limit exceeded */
  