1 /* histsearch.c -- searching the history list. */
3 /* Copyright (C) 1989, 1992 Free Software Foundation, Inc.
5 This file contains the GNU History Library (the Library), a set of
6 routines for managing the text of previously typed lines.
8 The Library is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 The Library is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 The GNU General Public License is often shipped with GNU software, and
19 is generally kept in a file called COPYING or LICENSE. If you do not
20 have a copy of the license, write to the Free Software Foundation,
21 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
23 #define READLINE_LIBRARY
25 #if defined (HAVE_CONFIG_H)
26 # include "config_readline.h"
30 #if defined (HAVE_STDLIB_H)
33 # include "ansi_stdlib.h"
34 #endif /* HAVE_STDLIB_H */
36 #if defined (HAVE_UNISTD_H)
38 # include <sys/types.h>
46 /* The list of alternate characters that can delimit a history search
48 char *history_search_delimiter_chars
= (char *)NULL
;
50 static int history_search_internal
PARAMS((const char *, int, int));
52 /* Search the history for STRING, starting at history_offset.
53 If DIRECTION < 0, then the search is through previous entries, else
54 through subsequent. If ANCHORED is non-zero, the string must
55 appear at the beginning of a history line, otherwise, the string
56 may appear anywhere in the line. If the string is found, then
57 current_history () is the history entry, and the value of this
58 function is the offset in the line of that history entry that the
59 string was found in. Otherwise, nothing is changed, and a -1 is
63 history_search_internal (string
, direction
, anchored
)
65 int direction
, anchored
;
67 register int i
, reverse
;
69 register int line_index
;
71 HIST_ENTRY
**the_history
; /* local */
74 reverse
= (direction
< 0);
76 /* Take care of trivial cases first. */
77 if (string
== 0 || *string
== '\0')
80 if (!history_length
|| ((i
>= history_length
) && !reverse
))
83 if (reverse
&& (i
>= history_length
))
84 i
= history_length
- 1;
86 #define NEXT_LINE() do { if (reverse) i--; else i++; } while (0)
88 the_history
= history_list ();
89 string_len
= strlen (string
);
92 /* Search each line in the history list for STRING. */
94 /* At limit for direction? */
95 if ((reverse
&& i
< 0) || (!reverse
&& i
== history_length
))
98 line
= the_history
[i
]->line
;
99 line_index
= strlen (line
);
101 /* If STRING is longer than line, no match. */
102 if (string_len
> line_index
)
108 /* Handle anchored searches first. */
109 if (anchored
== ANCHORED_SEARCH
)
111 if (STREQN (string
, line
, string_len
))
121 /* Do substring search. */
124 line_index
-= string_len
;
126 while (line_index
>= 0)
128 if (STREQN (string
, line
+ line_index
, string_len
))
140 limit
= line_index
- string_len
+ 1;
143 while (line_index
< limit
)
145 if (STREQN (string
, line
+ line_index
, string_len
))
157 /* Do a non-anchored search for STRING through the history in DIRECTION. */
159 history_search (string
, direction
)
163 return (history_search_internal (string
, direction
, NON_ANCHORED_SEARCH
));
166 /* Do an anchored search for string through the history in DIRECTION. */
168 history_search_prefix (string
, direction
)
172 return (history_search_internal (string
, direction
, ANCHORED_SEARCH
));
175 /* Search for STRING in the history list. DIR is < 0 for searching
176 backwards. POS is an absolute index into the history list at
177 which point to begin searching. */
179 history_search_pos (string
, dir
, pos
)
185 old
= where_history ();
186 history_set_pos (pos
);
187 if (history_search (string
, dir
) == -1)
189 history_set_pos (old
);
192 ret
= where_history ();
193 history_set_pos (old
);