1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
/*
* UNDO system
* Copyright
* (C) 1992 Joseph H. Allen
*
* This file is part of JOE (Joe's Own Editor)
*/
#ifndef _JOE_UNDO_H
#define _JOE_UNDO_H 1
struct undorec {
LINK(UNDOREC) link; /* Doubly-linked list of undo records */
UNDOREC *unit; /* If this is first record of a unit: points to last. If this is last record of a unit: points to first. */
int min; /* Set to allow merging of undo information with this record (like to small inserts) */
int changed; /* Status of modified flag before this record */
long where; /* Buffer address of this record */
long len; /* Length of insert or delete */
int del; /* Set if this is a delete */
B *big; /* Set to buffer containing a large amount of deleted data */
unsigned char *small; /* Set to malloc block containg a small amount of deleted data */
};
struct undo {
LINK(UNDO) link;
B *b;
int nrecs; /* Number of units */
UNDOREC recs; /* The undo records: recs.link.prev is latest */
UNDOREC *ptr; /* Pointer to latest "undone" record. */
UNDOREC *first; /* Pointers to first and last records of a group. The group is */
UNDOREC *last; /* treated as a single undo record. */
};
extern int inundo; /* Set if inserts/deletes are part of an undo operation */
extern int justkilled; /* Last edit was a delete, so store data in yank buffer */
UNDO *undomk PARAMS((B *b));
void undorm PARAMS((UNDO *undo));
int uundo PARAMS((BW *bw));
int uredo PARAMS((BW *bw));
void umclear PARAMS((void)); /* Call this to finalize current undo records. New changes will create new records. */
void undomark PARAMS((void));
void undoins PARAMS((UNDO *undo, P *p, long int size));
void undodel PARAMS((UNDO *undo, long int where, B *b));
int uyank PARAMS((BW *bw));
int uyankpop PARAMS((BW *bw));
int uyapp PARAMS((BW *bw));
int unotmod PARAMS((BW *bw));
int ucopy PARAMS((BW *bw));
void load_yank PARAMS((FILE *f));
void save_yank PARAMS((FILE *f));
void bw_unlock PARAMS((BW *bw));
extern int undo_keep;
#endif
|