1 /* History.h -- the names of functions that you can call in history. */ 2 3 typedef struct _hist_entry { 4 char *line; 5 char *data; 6 } HIST_ENTRY; 7 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; 11 12 /* Begin a session in which the history functions might be used. This 13 just initializes the interactive variables. */ 14 extern void using_history (); 15 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 (); 19 20 /* Returns the number which says what history element we are now 21 looking at. */ 22 extern int where_history (); 23 24 /* Set the position in the history list to POS. */ 25 int history_set_pos (); 26 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 (); 33 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 (); 38 39 /* Stifle the history list, remembering only MAX number of entries. */ 40 extern void stifle_history (); 41 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 (); 46 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 (); 51 52 /* Read a range of lines from FILENAME, adding them to the history list. 53 Start reading at the FROM'th line and end at the TO'th. If FROM 54 is zero, start at the beginning. If TO is less than FROM, read 55 until the end of the file. If FILENAME is NULL, then read from 56 ~/.history. Returns 0 if successful, or errno if not. */ 57 extern int read_history_range (); 58 59 /* Append the current history to FILENAME. If FILENAME is NULL, 60 then append the history list to ~/.history. Values returned 61 are as in read_history (). */ 62 extern int write_history (); 63 64 /* Append NELEMENT entries to FILENAME. The entries appended are from 65 the end of the list minus NELEMENTs up to the end of the list. */ 66 int append_history (); 67 68 /* Make the history entry at WHICH have LINE and DATA. This returns 69 the old entry so you can dispose of the data. In the case of an 70 invalid WHICH, a NULL pointer is returned. */ 71 extern HIST_ENTRY *replace_history_entry (); 72 73 /* Return the history entry at the current position, as determined by 74 history_offset. If there is no entry there, return a NULL pointer. */ 75 HIST_ENTRY *current_history (); 76 77 /* Back up history_offset to the previous history entry, and return 78 a pointer to that entry. If there is no previous entry, return 79 a NULL pointer. */ 80 extern HIST_ENTRY *previous_history (); 81 82 /* Move history_offset forward to the next item in the input_history, 83 and return the a pointer to that entry. If there is no next entry, 84 return a NULL pointer. */ 85 extern HIST_ENTRY *next_history (); 86 87 /* Return a NULL terminated array of HIST_ENTRY which is the current input 88 history. Element 0 of this list is the beginning of time. If there 89 is no history, return NULL. */ 90 extern HIST_ENTRY **history_list (); 91 92 /* Search the history for STRING, starting at history_offset. 93 If DIRECTION < 0, then the search is through previous entries, 94 else through subsequent. If the string is found, then 95 current_history () is the history entry, and the value of this function 96 is the offset in the line of that history entry that the string was 97 found in. Otherwise, nothing is changed, and a -1 is returned. */ 98 extern int history_search (); 99 100 /* Expand the string STRING, placing the result into OUTPUT, a pointer 101 to a string. Returns: 102 103 0) If no expansions took place (or, if the only change in 104 the text was the de-slashifying of the history expansion 105 character) 106 1) If expansions did take place 107 -1) If there was an error in expansion. 108 109 If an error ocurred in expansion, then OUTPUT contains a descriptive 110 error message. */ 111 extern int history_expand (); 112 113 /* Extract a string segment consisting of the FIRST through LAST 114 arguments present in STRING. Arguments are broken up as in 115 the shell. */ 116 extern char *history_arg_extract (); 117 118 /* Return the number of bytes that the primary history entries are using. 119 This just adds up the lengths of the_history->lines. */ 120 extern int history_total_bytes (); 121