1 /* History.h -- the names of functions that you can call in history. */
3 typedef struct _hist_entry
{
8 /* For convenience only. You set this when interpreting history commands.
9 It is the logical offset of the first history element. */
10 extern int history_base
;
12 /* Begin a session in which the history functions might be used. This
13 just initializes the interactive variables. */
14 extern void using_history ();
16 /* Place STRING at the end of the history list.
17 The associated data field (if any) is set to NULL. */
18 extern void add_history ();
20 /* Returns the number which says what history element we are now
22 extern int where_history ();
24 /* Set the position in the history list to POS. */
25 int history_set_pos ();
27 /* Search for STRING in the history list, starting at POS, an
28 absolute index into the list. DIR, if negative, says to search
29 backwards from POS, else forwards.
30 Returns the absolute index of the history element where STRING
31 was found, or -1 otherwise. */
32 extern int history_search_pos ();
34 /* A reasonably useless function, only here for completeness. WHICH
35 is the magic number that tells us which element to delete. The
36 elements are numbered from 0. */
37 extern HIST_ENTRY
*remove_history ();
39 /* Stifle the history list, remembering only MAX number of entries. */
40 extern void stifle_history ();
42 /* Stop stifling the history. This returns the previous amount the
43 history was stifled by. The value is positive if the history was
44 stifled, negative if it wasn't. */
45 extern int unstifle_history ();
47 /* Add the contents of FILENAME to the history list, a line at a time.
48 If FILENAME is NULL, then read from ~/.history. Returns 0 if
49 successful, or errno if not. */
50 extern int read_history ();
52 /* Append the current history to FILENAME. If FILENAME is NULL,
53 then append the history list to ~/.history. Values returned
54 are as in read_history (). */
55 extern int write_history ();
58 /* Make the history entry at WHICH have LINE and DATA. This returns
59 the old entry so you can dispose of the data. In the case of an
60 invalid WHICH, a NULL pointer is returned. */
61 extern HIST_ENTRY
*replace_history_entry ();
63 /* Return the history entry at the current position, as determined by
64 history_offset. If there is no entry there, return a NULL pointer. */
65 HIST_ENTRY
*current_history ();
67 /* Back up history_offset to the previous history entry, and return
68 a pointer to that entry. If there is no previous entry, return
70 extern HIST_ENTRY
*previous_history ();
72 /* Move history_offset forward to the next item in the input_history,
73 and return the a pointer to that entry. If there is no next entry,
74 return a NULL pointer. */
75 extern HIST_ENTRY
*next_history ();
77 /* Return a NULL terminated array of HIST_ENTRY which is the current input
78 history. Element 0 of this list is the beginning of time. If there
79 is no history, return NULL. */
80 extern HIST_ENTRY
**history_list ();
82 /* Search the history for STRING, starting at history_offset.
83 If DIRECTION < 0, then the search is through previous entries,
84 else through subsequent. If the string is found, then
85 current_history () is the history entry, and the value of this function
86 is the offset in the line of that history entry that the string was
87 found in. Otherwise, nothing is changed, and a -1 is returned. */
88 extern int history_search ();
90 /* Expand the string STRING, placing the result into OUTPUT, a pointer
93 0) If no expansions took place (or, if the only change in
94 the text was the de-slashifying of the history expansion
96 1) If expansions did take place
97 -1) If there was an error in expansion.
99 If an error ocurred in expansion, then OUTPUT contains a descriptive
101 extern int history_expand ();
103 /* Extract a string segment consisting of the FIRST through LAST
104 arguments present in STRING. Arguments are broken up as in
106 extern char *history_arg_extract ();
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