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/* $Id: undo.h,v 1.7 2000/11/05 01:59:20 amura Exp $ */
/*
* Undo supports: Ng 1.4(upto beta4) support undo like emacs.
* This undo is not support redo. and not perfect now.
*
* by MURAMATSU Atsushi
*/
/*
* $Log: undo.h,v $
* Revision 1.7 2000/11/05 01:59:20 amura
* ploblem with big undo is fixed
*
* Revision 1.6 2000/11/04 13:44:58 amura
* undo memory exception is more safety
*
* Revision 1.5 2000/07/22 20:49:38 amura
* more secure run insert
*
* Revision 1.4 2000/07/20 12:45:18 amura
* support undo with auto-fill mode
*
* Revision 1.3 2000/07/16 15:50:32 amura
* undo bug on autofill fixed
* rewrite macro functions
*
* Revision 1.2 2000/06/27 01:49:45 amura
* import to CVS
*
* Revision 1.1 2000/06/01 05:21:24 amura
* Initial revision
*
*/
#define UDNONE 0
#define UDDEL 1
#define UDBS 2
#define UDINS 3
#define UDINSNL 3 /* this is backward compatibirity */
#define UDOVER 5
#define UDTWIDDLE 6
#define UDREPL 7
#define UDMASK 0x0F
#define UDFIRST 0x10
typedef struct UNDO_DATA {
int u_type;
int u_dotlno;
short u_doto;
RSIZE u_size;
char u_code[2];
struct UNDO_DATA* u_next;
RSIZE u_used;
char *u_buffer;
} UNDO_DATA;
extern UNDO_DATA** undoptr;
extern UNDO_DATA** undostart;
extern UNDO_DATA** undobefore;
/* undo support functions */
VOID ublock_open pro((register BUFFER *));
VOID ublock_close pro((register BUFFER *));
VOID ublock_clear pro((register UNDO_DATA **));
VOID undo_clean pro((BUFFER*));
int undo_balloc pro((register UNDO_DATA*, register RSIZE));
int undo_bgrow pro((register UNDO_DATA*, register RSIZE));
/* undo support functions (implemented by macro for SPEED) */
#define isundo() (undoptr != NULL)
#define undo_check(_bp) ((_bp)->b_utop != (_bp)->b_ubottom)
#define undo_reset(_bp) ((void)((_bp)->b_ubottom = (_bp)->b_utop = 0, \
(_bp)->b_ulast = NULL))
#define undo_setup(_u) do { \
if (undoptr != NULL) { \
if (*undoptr == NULL) { \
*undoptr = malloc(sizeof(UNDO_DATA)); \
if (*undoptr == NULL) { \
ewprintf("undo_setup: No memory"); \
ttwait(); \
undo_clean(curbp); \
undoptr = NULL; \
(_u) = NULL; \
} else \
bzero(*undoptr, sizeof(UNDO_DATA)); \
} \
if (undoptr != NULL) \
(_u) = *undoptr; \
} \
} while (/*CONSTCOND*/0)
#define undo_finish(_n) do { \
undobefore = undoptr; \
undoptr = (_n); \
} while (/*CONSTCOND*/0)
#define undo_type(_u) ((_u)->u_type & UDMASK)
#define undo_bfree(_u) do { \
if ((_u)->u_size) { \
free((_u)->u_buffer); \
(_u)->u_size = 0; \
} \
} while (/*CONSTCOND*/0)
/* in line.c */
int get_lineno pro((BUFFER*, LINE*));
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