/* chardefs.h -- Character definitions for readline. */
#ifndef _CHARDEFS_
#define _CHARDEFS_

#include <ctype.h>

#if 0
/* Getting the correct definition of HAVE_STRING_H is harder than just
   declaring them ourselves.  CYGNUS LOCAL.  */
#if defined (HAVE_STRING_H)
#  include <string.h>
#else
#  include <strings.h>
#endif /* HAVE_STRING_H */
#else /* not 0 */
/* We don't worry about declaring functions where we don't use the return
   value (e.g. strcpy) or which return int.  */
extern char *strrchr ();
#endif /* not 0 */

#ifndef savestring
#if 0

/* CYGNUS LOCAL--this declaration loses if xmalloc has already been
   declared as void *xmalloc (), as in GDB.  The whole concept of
   readline using xmalloc rather than just returning NULL when it runs
   out of memory is questionable, but if we do want xmalloc we need a
   better way to declare it (e.g. the client declares it, or the client
   calls a rl_register_xmalloc function analagous to the way signal()
   works.  */

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

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

#ifdef CTRL
#undef CTRL
#endif

/* Some character stuff. */
#define control_character_threshold 0x020   /* Smaller than this is control. */
#define meta_character_threshold 0x07f	    /* Larger than this is Meta. */
#define control_character_bit 0x40	    /* 0x000000, must be off. */
#define meta_character_bit 0x080	    /* x0000000, must be on. */
#define largest_char 255		    /* Largest character value. */

#define META_CHAR(c) ((c) > meta_character_threshold && (c) <= largest_char)
#define CTRL(c) ((c) & (~control_character_bit))
#define META(c) ((c) | meta_character_bit)

#define UNMETA(c) ((c) & (~meta_character_bit))
#define UNCTRL(c) to_upper(((c)|control_character_bit))

#define lowercase_p(c) (((c) > ('a' - 1) && (c) < ('z' + 1)))
#define uppercase_p(c) (((c) > ('A' - 1) && (c) < ('Z' + 1)))

#define pure_alphabetic(c) (lowercase_p(c) || uppercase_p(c))

#ifndef to_upper
#define to_upper(c) (lowercase_p(c) ? ((c) - 32) : (c))
#define to_lower(c) (uppercase_p(c) ? ((c) + 32) : (c))
#endif

#define CTRL_P(c) ((c) < control_character_threshold)
#define META_P(c) ((c) > meta_character_threshold)

#ifndef NEWLINE
#define NEWLINE '\n'
#endif

#ifndef RETURN
#define RETURN CTRL('M')
#endif

#ifndef RUBOUT
#define RUBOUT 0x07f
#endif

#ifndef TAB
#define TAB '\t'
#endif

#ifdef ABORT_CHAR
#undef ABORT_CHAR
#endif
#define ABORT_CHAR CTRL('G')

#ifdef PAGE
#undef PAGE
#endif
#define PAGE CTRL('L')

#ifdef SPACE
#undef SPACE
#endif
#define SPACE 0x020

#ifdef ESC
#undef ESC
#endif

#define ESC CTRL('[')

#endif  /* _CHARDEFS_ */