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- /* History.h -- the names of functions that you can call in history. */
-
- /* The structure used to store a history entry. */
- typedef struct {
- char *line;
- char *data;
- } HIST_ENTRY;
-
- /* A structure used to pass the current state of the history stuff around. */
- typedef struct _hist_entry {
- HIST_ENTRY **entries; /* Pointer to the entries themselves. */
- int offset; /* The location pointer within this array. */
- int length; /* Number of elements within this array. */
- int size; /* Number of slots allocated to this array. */
- } HISTORY_STATE;
-
- /* For convenience only. You set this when interpreting history commands.
- It is the logical offset of the first history element. */
- extern int history_base;
-
- /* Begin a session in which the history functions might be used. This
- just initializes the interactive variables. */
- extern void using_history ();
-
- /* Return the current HISTORY_STATE of the history. */
- extern HISTORY_STATE *history_get_history_state ();
-
- /* Set the state of the current history array to STATE. */
- extern void history_set_history_state ();
-
- /* Place STRING at the end of the history list.
- The associated data field (if any) is set to NULL. */
- extern void add_history ();
-
- /* Returns the number which says what history element we are now
- looking at. */
- extern int where_history ();
-
- /* Set the position in the history list to POS. */
- int history_set_pos ();
-
- /* Search for STRING in the history list, starting at POS, an
- absolute index into the list. DIR, if negative, says to search
- backwards from POS, else forwards.
- Returns the absolute index of the history element where STRING
- was found, or -1 otherwise. */
- extern int history_search_pos ();
-
- /* A reasonably useless function, only here for completeness. WHICH
- is the magic number that tells us which element to delete. The
- elements are numbered from 0. */
- extern HIST_ENTRY *remove_history ();
-
- /* Stifle the history list, remembering only MAX number of entries. */
- extern void stifle_history ();
-
- /* Stop stifling the history. This returns the previous amount the
- history was stifled by. The value is positive if the history was
- stifled, negative if it wasn't. */
- extern int unstifle_history ();
-
- /* Add the contents of FILENAME to the history list, a line at a time.
- If FILENAME is NULL, then read from ~/.history. Returns 0 if
- successful, or errno if not. */
- extern int read_history ();
-
- /* Read a range of lines from FILENAME, adding them to the history list.
- Start reading at the FROM'th line and end at the TO'th. If FROM
- is zero, start at the beginning. If TO is less than FROM, read
- until the end of the file. If FILENAME is NULL, then read from
- ~/.history. Returns 0 if successful, or errno if not. */
- extern int read_history_range ();
-
- /* Append the current history to FILENAME. If FILENAME is NULL,
- then append the history list to ~/.history. Values returned
- are as in read_history (). */
- extern int write_history ();
-
- /* Append NELEMENT entries to FILENAME. The entries appended are from
- the end of the list minus NELEMENTs up to the end of the list. */
- int append_history ();
-
- /* Make the history entry at WHICH have LINE and DATA. This returns
- the old entry so you can dispose of the data. In the case of an
- invalid WHICH, a NULL pointer is returned. */
- extern HIST_ENTRY *replace_history_entry ();
-
- /* Return the history entry at the current position, as determined by
- history_offset. If there is no entry there, return a NULL pointer. */
- HIST_ENTRY *current_history ();
-
- /* Back up history_offset to the previous history entry, and return
- a pointer to that entry. If there is no previous entry, return
- a NULL pointer. */
- extern HIST_ENTRY *previous_history ();
-
- /* Move history_offset forward to the next item in the input_history,
- and return the a pointer to that entry. If there is no next entry,
- return a NULL pointer. */
- extern HIST_ENTRY *next_history ();
-
- /* Return a NULL terminated array of HIST_ENTRY which is the current input
- history. Element 0 of this list is the beginning of time. If there
- is no history, return NULL. */
- extern HIST_ENTRY **history_list ();
-
- /* Search the history for STRING, starting at history_offset.
- If DIRECTION < 0, then the search is through previous entries,
- else through subsequent. If the string is found, then
- current_history () is the history entry, and the value of this function
- is the offset in the line of that history entry that the string was
- found in. Otherwise, nothing is changed, and a -1 is returned. */
- extern int history_search ();
-
- /* Expand the string STRING, placing the result into OUTPUT, a pointer
- to a string. Returns:
-
- 0) If no expansions took place (or, if the only change in
- the text was the de-slashifying of the history expansion
- character)
- 1) If expansions did take place
- -1) If there was an error in expansion.
-
- If an error ocurred in expansion, then OUTPUT contains a descriptive
- error message. */
- extern int history_expand ();
-
- /* Extract a string segment consisting of the FIRST through LAST
- arguments present in STRING. Arguments are broken up as in
- the shell. */
- extern char *history_arg_extract ();
-
- /* Return the number of bytes that the primary history entries are using.
- This just adds up the lengths of the_history->lines. */
- extern int history_total_bytes ();
-