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
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
/* History.h -- the names of functions that you can call in history. */
/* Copyright (C) 1989, 1992 Free Software Foundation, Inc.
This file contains the GNU History Library (the Library), a set of
routines for managing the text of previously typed lines.
The Library is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
The Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
The GNU General Public License is often shipped with GNU software, and
is generally kept in a file called COPYING or LICENSE. If you do not
have a copy of the license, write to the Free Software Foundation,
59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#ifndef _HISTORY_H_
#define _HISTORY_H_
#ifdef __cplusplus
extern "C" {
#endif
#if defined READLINE_LIBRARY
# include "rlstdc.h"
# include "rltypedefs.h"
#else
# include <readline/rlstdc.h>
# include <readline/rltypedefs.h>
#endif
#ifdef __STDC__
typedef void *histdata_t;
#else
typedef char *histdata_t;
#endif
#include "rldynlink.h" /* for export / import macros */
/* The structure used to store a history entry. */
typedef struct _hist_entry {
char *line;
histdata_t data;
} HIST_ENTRY;
/* A structure used to pass the current state of the history stuff around. */
typedef struct _hist_state {
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. */
int flags;
} HISTORY_STATE;
/* Flag values for the `flags' member of HISTORY_STATE. */
#define HS_STIFLED 0x01
/* Initialization and state management. */
/* Begin a session in which the history functions might be used. This
just initializes the interactive variables. */
RL_EXTERN void using_history PARAMS((void));
/* Return the current HISTORY_STATE of the history. */
RL_EXTERN HISTORY_STATE * history_get_history_state PARAMS((void));
/* Set the state of the current history array to STATE. */
RL_EXTERN void history_set_history_state PARAMS((HISTORY_STATE *));
/* Manage the history list. */
/* Place STRING at the end of the history list.
The associated data field (if any) is set to NULL. */
RL_EXTERN void add_history PARAMS((const char *));
/* 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. */
RL_EXTERN HIST_ENTRY *remove_history PARAMS((int));
/* 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. */
RL_EXTERN HIST_ENTRY *replace_history_entry PARAMS((int, const char *, histdata_t));
/* Clear the history list and start over. */
RL_EXTERN void clear_history PARAMS((void));
/* Stifle the history list, remembering only MAX number of entries. */
RL_EXTERN void stifle_history PARAMS((int));
/* 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. */
RL_EXTERN int unstifle_history PARAMS((void));
/* Return 1 if the history is stifled, 0 if it is not. */
RL_EXTERN int history_is_stifled PARAMS((void));
/* Information about the history list. */
/* 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. */
RL_EXTERN HIST_ENTRY **history_list PARAMS((void));
/* Returns the number which says what history element we are now
looking at. */
RL_EXTERN int where_history PARAMS((void));
/* Return the history entry at the current position, as determined by
history_offset. If there is no entry there, return a NULL pointer. */
RL_EXTERN HIST_ENTRY *current_history PARAMS((void));
/* Return the history entry which is logically at OFFSET in the history
array. OFFSET is relative to history_base. */
RL_EXTERN HIST_ENTRY *history_get PARAMS((int));
/* Return the number of bytes that the primary history entries are using.
This just adds up the lengths of the_history->lines. */
RL_EXTERN int history_total_bytes PARAMS((void));
/* Moving around the history list. */
/* Set the position in the history list to POS. */
RL_EXTERN int history_set_pos PARAMS((int));
/* 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. */
RL_EXTERN HIST_ENTRY *previous_history PARAMS((void));
/* 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. */
RL_EXTERN HIST_ENTRY *next_history PARAMS((void));
/* Searching the 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. */
RL_EXTERN int history_search PARAMS((const char *, int));
/* Search the history for STRING, starting at history_offset.
The search is anchored: matching lines must begin with string.
DIRECTION is as in history_search(). */
RL_EXTERN int history_search_prefix PARAMS((const char *, int));
/* 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. */
RL_EXTERN int history_search_pos PARAMS((const char *, int, int));
/* Managing the history file. */
/* 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. */
RL_EXTERN int read_history PARAMS((const char *));
/* 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. */
RL_EXTERN int read_history_range PARAMS((const char *, int, int));
/* Write the current history to FILENAME. If FILENAME is NULL,
then write the history list to ~/.history. Values returned
are as in read_history (). */
RL_EXTERN int write_history PARAMS((const char *));
/* Append NELEMENT entries to FILENAME. The entries appended are from
the end of the list minus NELEMENTs up to the end of the list. */
RL_EXTERN int append_history PARAMS((int, const char *));
/* Truncate the history file, leaving only the last NLINES lines. */
RL_EXTERN int history_truncate_file PARAMS((const char *, int));
/* History expansion. */
/* 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.
2) If the returned line should just be printed.
If an error ocurred in expansion, then OUTPUT contains a descriptive
error message. */
RL_EXTERN int history_expand PARAMS((char *, char **));
/* Extract a string segment consisting of the FIRST through LAST
arguments present in STRING. Arguments are broken up as in
the shell. */
RL_EXTERN char *history_arg_extract PARAMS((int, int, const char *));
/* Return the text of the history event beginning at the current
offset into STRING. Pass STRING with *INDEX equal to the
history_expansion_char that begins this specification.
DELIMITING_QUOTE is a character that is allowed to end the string
specification for what to search for in addition to the normal
characters `:', ` ', `\t', `\n', and sometimes `?'. */
RL_EXTERN char *get_history_event PARAMS((const char *, int *, int));
/* Return an array of tokens, much as the shell might. The tokens are
parsed out of STRING. */
RL_EXTERN char **history_tokenize PARAMS((const char *));
/* Exported history variables. */
RL_EXTERN int history_base;
RL_EXTERN int history_length;
RL_EXTERN int history_max_entries;
RL_EXTERN char history_expansion_char;
RL_EXTERN char history_subst_char;
RL_EXTERN char *history_word_delimiters;
RL_EXTERN char history_comment_char;
RL_EXTERN char *history_no_expand_chars;
RL_EXTERN char *history_search_delimiter_chars;
RL_EXTERN int history_quotes_inhibit_expansion;
/* Backwards compatibility */
RL_EXTERN int max_input_history;
/* If set, this function is called to decide whether or not a particular
history expansion should be treated as a special case for the calling
application and not expanded. */
RL_EXTERN rl_linebuf_func_t *history_inhibit_expansion_function;
#ifdef __cplusplus
}
#endif
#endif /* !_HISTORY_H_ */
|
