#define _XEMACS_BUFFER_H_
#include "character.h"
-
-#ifdef UTF2000
-#include "mb-utf-8.h"
-#endif
+#include "multibyte.h"
/************************************************************************/
/* */
denoted with the word "unsafe" in their name and are generally
meant to be called only by other macros that have already
stored the calling values in temporary variables.
-
-
- Use the following functions/macros on contiguous strings of data.
- If the text you're operating on is known to come from a buffer, use
- the buffer-level functions below -- they know about the gap and may
- be more efficient.
-
-
- (A) For working with charptr's (pointers to internally-formatted text):
- -----------------------------------------------------------------------
-
- VALID_CHARPTR_P (ptr):
- Given a charptr, does it point to the beginning of a character?
-
- ASSERT_VALID_CHARPTR (ptr):
- If error-checking is enabled, assert that the given charptr
- points to the beginning of a character. Otherwise, do nothing.
-
- INC_CHARPTR (ptr):
- Given a charptr (assumed to point at the beginning of a character),
- modify that pointer so it points to the beginning of the next
- character.
-
- DEC_CHARPTR (ptr):
- Given a charptr (assumed to point at the beginning of a
- character or at the very end of the text), modify that pointer
- so it points to the beginning of the previous character.
-
- VALIDATE_CHARPTR_BACKWARD (ptr):
- Make sure that PTR is pointing to the beginning of a character.
- If not, back up until this is the case. Note that there are not
- too many places where it is legitimate to do this sort of thing.
- It's an error if you're passed an "invalid" char * pointer.
- NOTE: PTR *must* be pointing to a valid part of the string (i.e.
- not the very end, unless the string is zero-terminated or
- something) in order for this function to not cause crashes.
-
- VALIDATE_CHARPTR_FORWARD (ptr):
- Make sure that PTR is pointing to the beginning of a character.
- If not, move forward until this is the case. Note that there
- are not too many places where it is legitimate to do this sort
- of thing. It's an error if you're passed an "invalid" char *
- pointer.
-
-
- (B) For working with the length (in bytes and characters) of a
- section of internally-formatted text:
- --------------------------------------------------------------
-
- bytecount_to_charcount (ptr, nbi):
- Given a pointer to a text string and a length in bytes,
- return the equivalent length in characters.
-
- charcount_to_bytecount (ptr, nch):
- Given a pointer to a text string and a length in characters,
- return the equivalent length in bytes.
-
- charptr_n_addr (ptr, n):
- Return a pointer to the beginning of the character offset N
- (in characters) from PTR.
-
- MAX_EMCHAR_LEN:
- Maximum number of buffer bytes per Emacs character.
-
-
- (C) For retrieving or changing the character pointed to by a charptr:
- ---------------------------------------------------------------------
-
- charptr_emchar (ptr):
- Retrieve the character pointed to by PTR as an Emchar.
-
- charptr_emchar_n (ptr, n):
- Retrieve the character at offset N (in characters) from PTR,
- as an Emchar.
-
- set_charptr_emchar (ptr, ch):
- Store the character CH (an Emchar) as internally-formatted
- text starting at PTR. Return the number of bytes stored.
-
- charptr_copy_char (ptr, ptr2):
- Retrieve the character pointed to by PTR and store it as
- internally-formatted text in PTR2.
-
*/
-
-/* ---------------------------------------------------------------------- */
-/* (A) For working with charptr's (pointers to internally-formatted text) */
-/* ---------------------------------------------------------------------- */
-
-#ifdef MULE
-# define VALID_CHARPTR_P(ptr) BUFBYTE_FIRST_BYTE_P (* (unsigned char *) ptr)
-#else
-# define VALID_CHARPTR_P(ptr) 1
-#endif
-
-#ifdef ERROR_CHECK_BUFPOS
-# define ASSERT_VALID_CHARPTR(ptr) assert (VALID_CHARPTR_P (ptr))
-#else
-# define ASSERT_VALID_CHARPTR(ptr)
-#endif
-
-/* Note that INC_CHARPTR() and DEC_CHARPTR() have to be written in
- completely separate ways. INC_CHARPTR() cannot use the DEC_CHARPTR()
- trick of looking for a valid first byte because it might run off
- the end of the string. DEC_CHARPTR() can't use the INC_CHARPTR()
- method because it doesn't have easy access to the first byte of
- the character it's moving over. */
-
-#define REAL_INC_CHARPTR(ptr) \
- ((void) ((ptr) += REP_BYTES_BY_FIRST_BYTE (* (unsigned char *) (ptr))))
-
-#define REAL_INC_CHARBYTIND(ptr,pos) \
- (pos += REP_BYTES_BY_FIRST_BYTE (* (unsigned char *) (ptr)))
-
-#define REAL_DEC_CHARPTR(ptr) do { \
- (ptr)--; \
-} while (!VALID_CHARPTR_P (ptr))
-
-#ifdef ERROR_CHECK_BUFPOS
-#define INC_CHARPTR(ptr) do { \
- ASSERT_VALID_CHARPTR (ptr); \
- REAL_INC_CHARPTR (ptr); \
-} while (0)
-
-#define INC_CHARBYTIND(ptr,pos) do { \
- ASSERT_VALID_CHARPTR (ptr); \
- REAL_INC_CHARBYTIND (ptr,pos); \
-} while (0)
-
-#define DEC_CHARPTR(ptr) do { \
- CONST Bufbyte *dc_ptr1 = (ptr); \
- CONST Bufbyte *dc_ptr2 = dc_ptr1; \
- REAL_DEC_CHARPTR (dc_ptr2); \
- assert (dc_ptr1 - dc_ptr2 == \
- REP_BYTES_BY_FIRST_BYTE (*dc_ptr2)); \
- (ptr) = dc_ptr2; \
-} while (0)
-
-#else /* ! ERROR_CHECK_BUFPOS */
-#define INC_CHARBYTIND(ptr,pos) REAL_INC_CHARBYTIND (ptr,pos)
-#define INC_CHARPTR(ptr) REAL_INC_CHARPTR (ptr)
-#define DEC_CHARPTR(ptr) REAL_DEC_CHARPTR (ptr)
-#endif /* ! ERROR_CHECK_BUFPOS */
-
-#ifdef MULE
-
-#define VALIDATE_CHARPTR_BACKWARD(ptr) do { \
- while (!VALID_CHARPTR_P (ptr)) ptr--; \
-} while (0)
-
-/* This needs to be trickier to avoid the possibility of running off
- the end of the string. */
-
-#define VALIDATE_CHARPTR_FORWARD(ptr) do { \
- Bufbyte *vcf_ptr = (ptr); \
- VALIDATE_CHARPTR_BACKWARD (vcf_ptr); \
- if (vcf_ptr != (ptr)) \
- { \
- (ptr) = vcf_ptr; \
- INC_CHARPTR (ptr); \
- } \
-} while (0)
-
-#else /* not MULE */
-#define VALIDATE_CHARPTR_BACKWARD(ptr)
-#define VALIDATE_CHARPTR_FORWARD(ptr)
-#endif /* not MULE */
-
-/* -------------------------------------------------------------- */
-/* (B) For working with the length (in bytes and characters) of a */
-/* section of internally-formatted text */
-/* -------------------------------------------------------------- */
-
-INLINE CONST Bufbyte *charptr_n_addr (CONST Bufbyte *ptr, Charcount offset);
-INLINE CONST Bufbyte *
-charptr_n_addr (CONST Bufbyte *ptr, Charcount offset)
-{
- return ptr + charcount_to_bytecount (ptr, offset);
-}
-
-#ifdef UTF2000
-# define MAX_EMCHAR_LEN 6
-#else
-#ifdef MULE
-# define MAX_EMCHAR_LEN 4
-#else
-# define MAX_EMCHAR_LEN 1
-#endif
-#endif
-
-/* -------------------------------------------------------------------- */
-/* (C) For retrieving or changing the character pointed to by a charptr */
-/* -------------------------------------------------------------------- */
-
-#define simple_charptr_emchar(ptr) ((Emchar) (ptr)[0])
-#define simple_set_charptr_emchar(ptr, x) ((ptr)[0] = (Bufbyte) (x), 1)
-#define simple_charptr_copy_char(ptr, ptr2) ((ptr2)[0] = *(ptr), 1)
-
-#ifdef MULE
-
-Emchar non_ascii_charptr_emchar (CONST Bufbyte *ptr);
-Bytecount non_ascii_set_charptr_emchar (Bufbyte *ptr, Emchar c);
-Bytecount non_ascii_charptr_copy_char (CONST Bufbyte *ptr, Bufbyte *ptr2);
-
-INLINE Emchar charptr_emchar (CONST Bufbyte *ptr);
-INLINE Emchar
-charptr_emchar (CONST Bufbyte *ptr)
-{
- return BYTE_ASCII_P (*ptr) ?
- simple_charptr_emchar (ptr) :
- non_ascii_charptr_emchar (ptr);
-}
-
-INLINE Bytecount set_charptr_emchar (Bufbyte *ptr, Emchar x);
-INLINE Bytecount
-set_charptr_emchar (Bufbyte *ptr, Emchar x)
-{
- return !CHAR_MULTIBYTE_P (x) ?
- simple_set_charptr_emchar (ptr, x) :
- non_ascii_set_charptr_emchar (ptr, x);
-}
-
-INLINE Bytecount charptr_copy_char (CONST Bufbyte *ptr, Bufbyte *ptr2);
-INLINE Bytecount
-charptr_copy_char (CONST Bufbyte *ptr, Bufbyte *ptr2)
-{
- return BYTE_ASCII_P (*ptr) ?
- simple_charptr_copy_char (ptr, ptr2) :
- non_ascii_charptr_copy_char (ptr, ptr2);
-}
-
-#else /* not MULE */
-
-# define charptr_emchar(ptr) simple_charptr_emchar (ptr)
-# define set_charptr_emchar(ptr, x) simple_set_charptr_emchar (ptr, x)
-# define charptr_copy_char(ptr, ptr2) simple_charptr_copy_char (ptr, ptr2)
-
-#endif /* not MULE */
-
-#define charptr_emchar_n(ptr, offset) \
- charptr_emchar (charptr_n_addr (ptr, offset))
-
\f
/*----------------------------------------------------------------------*/
/* Accessor macros for important positions in a buffer */
#ifndef MULE
-typedef int Charset_ID;
-
-#define Vcharset_ascii Qnil
-
-#define CHAR_CHARSET(ch) Vcharset_ascii
-#define CHAR_LEADING_BYTE(ch) LEADING_BYTE_ASCII
-#define LEADING_BYTE_ASCII 0x80
-#define NUM_LEADING_BYTES 1
-#define MIN_LEADING_BYTE 0x80
-#define CHARSETP(cs) 1
-#define CHARSET_BY_LEADING_BYTE(lb) Vcharset_ascii
-#define XCHARSET_LEADING_BYTE(cs) LEADING_BYTE_ASCII
-#define XCHARSET_GRAPHIC(cs) -1
-#define XCHARSET_COLUMNS(cs) 1
-#define XCHARSET_DIMENSION(cs) 1
#define REP_BYTES_BY_FIRST_BYTE(fb) 1
-#define BREAKUP_CHAR(ch, charset, byte1, byte2) do { \
- (charset) = Vcharset_ascii; \
- (byte1) = (ch); \
- (byte2) = 0; \
-} while (0)
#define BYTE_ASCII_P(byte) 1
#endif /* ! MULE */
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