112 lines
4.1 KiB
C
112 lines
4.1 KiB
C
/* History.h -- the names of functions that you can call in history.
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$Id: history.h,v 1.2 1993/08/02 17:40:37 mycroft Exp $
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*/
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typedef struct _hist_entry {
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char *line;
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char *data;
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} HIST_ENTRY;
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/* For convenience only. You set this when interpreting history commands.
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It is the logical offset of the first history element. */
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extern int history_base;
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/* Begin a session in which the history functions might be used. This
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just initializes the interactive variables. */
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extern void using_history ();
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/* Place STRING at the end of the history list.
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The associated data field (if any) is set to NULL. */
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extern void add_history ();
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/* Returns the number which says what history element we are now
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looking at. */
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extern int where_history ();
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/* Set the position in the history list to POS. */
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int history_set_pos ();
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/* Search for STRING in the history list, starting at POS, an
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absolute index into the list. DIR, if negative, says to search
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backwards from POS, else forwards.
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Returns the absolute index of the history element where STRING
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was found, or -1 otherwise. */
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extern int history_search_pos ();
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/* A reasonably useless function, only here for completeness. WHICH
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is the magic number that tells us which element to delete. The
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elements are numbered from 0. */
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extern HIST_ENTRY *remove_history ();
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/* Stifle the history list, remembering only MAX number of entries. */
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extern void stifle_history ();
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/* Stop stifling the history. This returns the previous amount the
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history was stifled by. The value is positive if the history was
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stifled, negative if it wasn't. */
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extern int unstifle_history ();
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/* Add the contents of FILENAME to the history list, a line at a time.
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If FILENAME is NULL, then read from ~/.history. Returns 0 if
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successful, or errno if not. */
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extern int read_history ();
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/* Append the current history to FILENAME. If FILENAME is NULL,
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then append the history list to ~/.history. Values returned
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are as in read_history (). */
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extern int write_history ();
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/* Make the history entry at WHICH have LINE and DATA. This returns
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the old entry so you can dispose of the data. In the case of an
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invalid WHICH, a NULL pointer is returned. */
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extern HIST_ENTRY *replace_history_entry ();
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/* Return the history entry at the current position, as determined by
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history_offset. If there is no entry there, return a NULL pointer. */
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HIST_ENTRY *current_history ();
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/* Back up history_offset to the previous history entry, and return
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a pointer to that entry. If there is no previous entry, return
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a NULL pointer. */
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extern HIST_ENTRY *previous_history ();
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/* Move history_offset forward to the next item in the input_history,
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and return the a pointer to that entry. If there is no next entry,
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return a NULL pointer. */
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extern HIST_ENTRY *next_history ();
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/* Return a NULL terminated array of HIST_ENTRY which is the current input
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history. Element 0 of this list is the beginning of time. If there
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is no history, return NULL. */
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extern HIST_ENTRY **history_list ();
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/* Search the history for STRING, starting at history_offset.
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If DIRECTION < 0, then the search is through previous entries,
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else through subsequent. If the string is found, then
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current_history () is the history entry, and the value of this function
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is the offset in the line of that history entry that the string was
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found in. Otherwise, nothing is changed, and a -1 is returned. */
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extern int history_search ();
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/* Expand the string STRING, placing the result into OUTPUT, a pointer
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to a string. Returns:
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0) If no expansions took place (or, if the only change in
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the text was the de-slashifying of the history expansion
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character)
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1) If expansions did take place
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-1) If there was an error in expansion.
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If an error ocurred in expansion, then OUTPUT contains a descriptive
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error message. */
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extern int history_expand ();
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/* Extract a string segment consisting of the FIRST through LAST
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arguments present in STRING. Arguments are broken up as in
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the shell. */
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extern char *history_arg_extract ();
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