File: | src/gnu/lib/libreadline/parens.c |
Warning: | line 135, column 7 Value stored to 'ready' is never read |
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1 | /* parens.c -- Implementation of matching parentheses feature. */ |
2 | |
3 | /* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc. |
4 | |
5 | This file is part of the GNU Readline Library, a library for |
6 | reading lines of text with interactive input and history editing. |
7 | |
8 | The GNU Readline Library is free software; you can redistribute it |
9 | and/or modify it under the terms of the GNU General Public License |
10 | as published by the Free Software Foundation; either version 2, or |
11 | (at your option) any later version. |
12 | |
13 | The GNU Readline Library is distributed in the hope that it will be |
14 | useful, but WITHOUT ANY WARRANTY; without even the implied warranty |
15 | of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
16 | GNU General Public License for more details. |
17 | |
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 | 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
22 | #define READLINE_LIBRARY |
23 | |
24 | #include "rlconf.h" |
25 | |
26 | #if defined (HAVE_CONFIG_H1) |
27 | # include <config.h> |
28 | #endif |
29 | |
30 | #include <stdio.h> |
31 | #include <sys/types.h> |
32 | |
33 | #if defined (HAVE_UNISTD_H1) |
34 | # include <unistd.h> |
35 | #endif |
36 | |
37 | #if defined (FD_SET) && !defined (HAVE_SELECT1) |
38 | # define HAVE_SELECT1 |
39 | #endif |
40 | |
41 | #if defined (HAVE_SELECT1) |
42 | # include <sys/time.h> |
43 | #endif /* HAVE_SELECT */ |
44 | #if defined (HAVE_SYS_SELECT_H1) |
45 | # include <sys/select.h> |
46 | #endif |
47 | |
48 | #if defined (HAVE_STRING_H1) |
49 | # include <string.h> |
50 | #else /* !HAVE_STRING_H */ |
51 | # include <strings.h> |
52 | #endif /* !HAVE_STRING_H */ |
53 | |
54 | #if !defined (strchr) && !defined (__STDC__1) |
55 | extern char *strchr (), *strrchr (); |
56 | #endif /* !strchr && !__STDC__ */ |
57 | |
58 | #include "readline.h" |
59 | #include "rlprivate.h" |
60 | |
61 | static int find_matching_open PARAMS((char *, int, int))(char *, int, int); |
62 | |
63 | /* Non-zero means try to blink the matching open parenthesis when the |
64 | close parenthesis is inserted. */ |
65 | #if defined (HAVE_SELECT1) |
66 | int rl_blink_matching_paren = 1; |
67 | #else /* !HAVE_SELECT */ |
68 | int rl_blink_matching_paren = 0; |
69 | #endif /* !HAVE_SELECT */ |
70 | |
71 | static int _paren_blink_usec = 500000; |
72 | |
73 | /* Change emacs_standard_keymap to have bindings for paren matching when |
74 | ON_OR_OFF is 1, change them back to self_insert when ON_OR_OFF == 0. */ |
75 | void |
76 | _rl_enable_paren_matching (on_or_off) |
77 | int on_or_off; |
78 | { |
79 | if (on_or_off) |
80 | { /* ([{ */ |
81 | rl_bind_key_in_map (')', rl_insert_close, emacs_standard_keymap); |
82 | rl_bind_key_in_map (']', rl_insert_close, emacs_standard_keymap); |
83 | rl_bind_key_in_map ('}', rl_insert_close, emacs_standard_keymap); |
84 | } |
85 | else |
86 | { /* ([{ */ |
87 | rl_bind_key_in_map (')', rl_insert, emacs_standard_keymap); |
88 | rl_bind_key_in_map (']', rl_insert, emacs_standard_keymap); |
89 | rl_bind_key_in_map ('}', rl_insert, emacs_standard_keymap); |
90 | } |
91 | } |
92 | |
93 | int |
94 | rl_set_paren_blink_timeout (u) |
95 | int u; |
96 | { |
97 | int o; |
98 | |
99 | o = _paren_blink_usec; |
100 | if (u > 0) |
101 | _paren_blink_usec = u; |
102 | return (o); |
103 | } |
104 | |
105 | int |
106 | rl_insert_close (count, invoking_key) |
107 | int count, invoking_key; |
108 | { |
109 | if (rl_explicit_arg || !rl_blink_matching_paren) |
110 | _rl_insert_char (count, invoking_key); |
111 | else |
112 | { |
113 | #if defined (HAVE_SELECT1) |
114 | int orig_point, match_point, ready; |
115 | struct timeval timer; |
116 | fd_set readfds; |
117 | |
118 | _rl_insert_char (1, invoking_key); |
119 | (*rl_redisplay_function) (); |
120 | match_point = |
121 | find_matching_open (rl_line_buffer, rl_point - 2, invoking_key); |
122 | |
123 | /* Emacs might message or ring the bell here, but I don't. */ |
124 | if (match_point < 0) |
125 | return -1; |
126 | |
127 | FD_ZERO (&readfds)do { fd_set *_p = (&readfds); __size_t _n = (((1024) + (( ((unsigned)(sizeof(__fd_mask) * 8))) - 1)) / (((unsigned)(sizeof (__fd_mask) * 8)))); while (_n > 0) _p->fds_bits[--_n] = 0; } while (0); |
128 | FD_SET (fileno (rl_instream), &readfds)__fd_set(((!__isthreaded ? ((rl_instream)->_file) : (fileno )(rl_instream))), (&readfds)); |
129 | timer.tv_sec = 0; |
130 | timer.tv_usec = _paren_blink_usec; |
131 | |
132 | orig_point = rl_point; |
133 | rl_point = match_point; |
134 | (*rl_redisplay_function) (); |
135 | ready = select (1, &readfds, (fd_set *)NULL((void *)0), (fd_set *)NULL((void *)0), &timer); |
Value stored to 'ready' is never read | |
136 | rl_point = orig_point; |
137 | #else /* !HAVE_SELECT */ |
138 | _rl_insert_char (count, invoking_key); |
139 | #endif /* !HAVE_SELECT */ |
140 | } |
141 | return 0; |
142 | } |
143 | |
144 | static int |
145 | find_matching_open (string, from, closer) |
146 | char *string; |
147 | int from, closer; |
148 | { |
149 | register int i; |
150 | int opener, level, delimiter; |
151 | |
152 | switch (closer) |
153 | { |
154 | case ']': opener = '['; break; |
155 | case '}': opener = '{'; break; |
156 | case ')': opener = '('; break; |
157 | default: |
158 | return (-1); |
159 | } |
160 | |
161 | level = 1; /* The closer passed in counts as 1. */ |
162 | delimiter = 0; /* Delimited state unknown. */ |
163 | |
164 | for (i = from; i > -1; i--) |
165 | { |
166 | if (delimiter && (string[i] == delimiter)) |
167 | delimiter = 0; |
168 | else if (rl_basic_quote_characters && strchr (rl_basic_quote_characters, string[i])) |
169 | delimiter = string[i]; |
170 | else if (!delimiter && (string[i] == closer)) |
171 | level++; |
172 | else if (!delimiter && (string[i] == opener)) |
173 | level--; |
174 | |
175 | if (!level) |
176 | break; |
177 | } |
178 | return (i); |
179 | } |