/* alias.h -- structure definitions. */

#ifndef _ALIAS_
#define _ALIAS_

#ifndef whitespace
#define whitespace(c) (((c) == ' ') || ((c) == '\t'))
#endif

#ifndef savestring
#define savestring(x) (char *)strcpy (xmalloc (1 + strlen (x)), (x))
#endif

typedef struct {
  char *name;
  char *value;
} ASSOC;

#ifndef NULL
#define NULL 0x0
#endif

/* The list of known aliases. */
extern ASSOC **aliases;

/* Scan the list of aliases looking for one with NAME.  Return NULL
   if the alias doesn't exist, else a pointer to the assoc. */
extern ASSOC *find_alias ();

/* Return the value of the alias for NAME, or NULL if there is none. */
extern char *get_alias_value ();

/* Make a new alias from NAME and VALUE.  If NAME can be found,
   then replace its value. */
extern void add_alias ();

/* Remove the alias with name NAME from the alias list.  Returns
   the index of the removed alias, or -1 if the alias didn't exist. */
extern int remove_alias ();

/* Return a new line, with any aliases substituted. */
extern char *alias_substitute ();

#endif  /* _ALIAS_ */