Commit | Line | Data |
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c374ab69 MV |
1 | /* readline.c --- line editing support for Guile */ |
2 | ||
576cdec4 | 3 | /* Copyright (C) 1997,1999, 2000 Free Software Foundation, Inc. |
c374ab69 MV |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2, or (at your option) | |
8 | * any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this software; see the file COPYING. If not, write to | |
c6e23ea2 JB |
17 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
18 | * Boston, MA 02111-1307 USA | |
c374ab69 MV |
19 | * |
20 | */ | |
f48e47b9 GB |
21 | |
22 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, | |
23 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
24 | ||
c374ab69 MV |
25 | \f |
26 | ||
739b3bf1 | 27 | #include "libguile/_scm.h" |
62947883 | 28 | #ifdef HAVE_RL_GETC_FUNCTION |
fbf68f8b | 29 | #include "libguile.h" |
739b3bf1 MD |
30 | #include "libguile/gh.h" |
31 | #include "libguile/iselect.h" | |
32 | ||
ffdeebc3 | 33 | #include <stdio.h> |
48552b1d MD |
34 | #ifdef HAVE_UNISTD_H |
35 | #include <unistd.h> | |
36 | #endif | |
c374ab69 MV |
37 | #include <readline/readline.h> |
38 | #include <readline/history.h> | |
c374ab69 | 39 | #include <sys/time.h> |
b71099ba | 40 | #include <signal.h> |
c374ab69 | 41 | |
1c537018 | 42 | #include "libguile/validate.h" |
a0599745 | 43 | #include "guile-readline/readline.h" |
c374ab69 MV |
44 | |
45 | scm_option scm_readline_opts[] = { | |
46 | { SCM_OPTION_BOOLEAN, "history-file", 1, | |
47 | "Use history file." }, | |
48 | { SCM_OPTION_INTEGER, "history-length", 200, | |
49 | "History length." }, | |
50 | { SCM_OPTION_INTEGER, "bounce-parens", 500, | |
51 | "Time (ms) to show matching opening parenthesis (0 = off)."} | |
52 | }; | |
53 | ||
54 | extern void stifle_history (int max); | |
55 | ||
b916d813 | 56 | SCM_DEFINE (scm_readline_options, "readline-options-interface", 0, 1, 0, |
f48e47b9 GB |
57 | (SCM setting), |
58 | "") | |
59 | #define FUNC_NAME s_scm_readline_options | |
c374ab69 MV |
60 | { |
61 | SCM ans = scm_options (setting, | |
62 | scm_readline_opts, | |
63 | SCM_N_READLINE_OPTIONS, | |
f48e47b9 | 64 | FUNC_NAME); |
c374ab69 MV |
65 | stifle_history (SCM_HISTORY_LENGTH); |
66 | return ans; | |
67 | } | |
f48e47b9 | 68 | #undef FUNC_NAME |
c374ab69 MV |
69 | |
70 | #ifndef HAVE_STRDUP | |
71 | static char * | |
72 | strdup (char *s) | |
73 | { | |
74 | int len = strlen (s); | |
75 | char *new = malloc (len + 1); | |
76 | strcpy (new, s); | |
77 | return new; | |
78 | } | |
79 | #endif /* HAVE_STRDUP */ | |
80 | ||
81 | #ifndef HAVE_RL_CLEANUP_AFTER_SIGNAL | |
82 | ||
83 | /* These are readline functions added in release 2.3. They will work | |
84 | * together with readline-2.1 and 2.2. (The readline interface is | |
85 | * disabled for earlier releases.) | |
86 | * They are declared static; if we want to use them elsewhere, then | |
87 | * we need external declarations for them, but at the moment, I don't | |
88 | * think anything else in Guile ought to use these. | |
89 | */ | |
90 | ||
91 | extern void _rl_clean_up_for_exit (); | |
92 | extern void _rl_kill_kbd_macro (); | |
93 | extern int _rl_init_argument (); | |
94 | ||
2e3d5987 | 95 | void |
c374ab69 MV |
96 | rl_cleanup_after_signal () |
97 | { | |
98 | #ifdef HAVE_RL_CLEAR_SIGNALS | |
99 | _rl_clean_up_for_exit (); | |
100 | #endif | |
101 | (*rl_deprep_term_function) (); | |
102 | #ifdef HAVE_RL_CLEAR_SIGNALS | |
103 | rl_clear_signals (); | |
104 | #endif | |
105 | rl_pending_input = 0; | |
106 | } | |
107 | ||
2e3d5987 | 108 | void |
c374ab69 MV |
109 | rl_free_line_state () |
110 | { | |
111 | register HIST_ENTRY *entry; | |
112 | ||
113 | free_undo_list (); | |
114 | ||
115 | entry = current_history (); | |
116 | if (entry) | |
117 | entry->data = (char *)NULL; | |
118 | ||
119 | _rl_kill_kbd_macro (); | |
120 | rl_clear_message (); | |
121 | _rl_init_argument (); | |
122 | } | |
123 | ||
124 | #endif /* !HAVE_RL_CLEANUP_AFTER_SIGNAL */ | |
125 | ||
126 | static int promptp; | |
127 | static SCM input_port; | |
128 | static SCM before_read; | |
129 | ||
130 | static int | |
131 | current_input_getc (FILE *in) | |
132 | { | |
379b35da | 133 | if (promptp && !SCM_FALSEP (before_read)) |
c374ab69 MV |
134 | { |
135 | scm_apply (before_read, SCM_EOL, SCM_EOL); | |
136 | promptp = 0; | |
137 | } | |
bc858b80 | 138 | return scm_getc (input_port); |
c374ab69 MV |
139 | } |
140 | ||
141 | static void | |
142 | redisplay () | |
143 | { | |
144 | rl_redisplay (); | |
145 | /* promptp = 1; */ | |
146 | } | |
147 | ||
c374ab69 MV |
148 | static int in_readline = 0; |
149 | #ifdef USE_THREADS | |
150 | static scm_mutex_t reentry_barrier_mutex; | |
151 | #endif | |
152 | ||
f48e47b9 GB |
153 | static SCM internal_readline (SCM text); |
154 | static SCM handle_error (void *data, SCM tag, SCM args); | |
48552b1d | 155 | static void reentry_barrier (void); |
f48e47b9 GB |
156 | |
157 | ||
b916d813 | 158 | SCM_DEFINE (scm_readline, "%readline", 0, 4, 0, |
f48e47b9 GB |
159 | (SCM text, SCM inp, SCM outp, SCM read_hook), |
160 | "") | |
161 | #define FUNC_NAME s_scm_readline | |
162 | { | |
163 | SCM ans; | |
164 | ||
165 | reentry_barrier (); | |
166 | ||
167 | before_read = SCM_BOOL_F; | |
168 | ||
169 | if (!SCM_UNBNDP (text)) | |
170 | { | |
379b35da | 171 | if (!SCM_STRINGP (text)) |
f48e47b9 GB |
172 | { |
173 | --in_readline; | |
174 | scm_wrong_type_arg (s_scm_readline, SCM_ARG1, text); | |
175 | } | |
08b5e6c3 | 176 | SCM_STRING_COERCE_0TERMINATION_X (text); |
f48e47b9 GB |
177 | } |
178 | ||
379b35da DH |
179 | if (!((SCM_UNBNDP (inp) && SCM_OPINFPORTP (scm_cur_inp)) |
180 | || SCM_OPINFPORTP (inp))) | |
f48e47b9 GB |
181 | { |
182 | --in_readline; | |
183 | scm_misc_error (s_scm_readline, | |
184 | "Input port is not open or not a file port", | |
185 | SCM_EOL); | |
186 | } | |
187 | ||
379b35da DH |
188 | if (!((SCM_UNBNDP (outp) && SCM_OPINFPORTP (scm_cur_outp)) |
189 | || SCM_OPOUTFPORTP (outp))) | |
f48e47b9 GB |
190 | { |
191 | --in_readline; | |
192 | scm_misc_error (s_scm_readline, | |
193 | "Output port is not open or not a file port", | |
194 | SCM_EOL); | |
195 | } | |
196 | ||
197 | if (!(SCM_UNBNDP (read_hook) || SCM_FALSEP (read_hook))) | |
198 | { | |
199 | if (!(SCM_NFALSEP (scm_thunk_p (read_hook)))) | |
200 | { | |
201 | --in_readline; | |
202 | scm_wrong_type_arg (s_scm_readline, SCM_ARG4, read_hook); | |
203 | } | |
204 | before_read = read_hook; | |
205 | } | |
206 | ||
207 | scm_readline_init_ports (inp, outp); | |
208 | ||
209 | ans = scm_internal_catch (SCM_BOOL_T, | |
210 | (scm_catch_body_t) internal_readline, | |
f60d011a | 211 | (void *) SCM_UNPACK (text), |
f48e47b9 GB |
212 | handle_error, 0); |
213 | ||
214 | fclose (rl_instream); | |
215 | fclose (rl_outstream); | |
216 | ||
217 | --in_readline; | |
218 | return ans; | |
219 | } | |
220 | #undef FUNC_NAME | |
221 | ||
222 | ||
c374ab69 MV |
223 | static void |
224 | reentry_barrier () | |
225 | { | |
226 | int reentryp = 0; | |
227 | #ifdef USE_THREADS | |
228 | /* We should rather use scm_mutex_try_lock when it becomes available */ | |
229 | scm_mutex_lock (&reentry_barrier_mutex); | |
230 | #endif | |
231 | if (in_readline) | |
232 | reentryp = 1; | |
233 | else | |
234 | ++in_readline; | |
235 | #ifdef USE_THREADS | |
236 | scm_mutex_unlock (&reentry_barrier_mutex); | |
237 | #endif | |
238 | if (reentryp) | |
f48e47b9 | 239 | scm_misc_error (s_scm_readline, "readline is not reentrant", SCM_EOL); |
c374ab69 MV |
240 | } |
241 | ||
242 | static SCM | |
243 | handle_error (void *data, SCM tag, SCM args) | |
244 | { | |
245 | rl_free_line_state (); | |
246 | rl_cleanup_after_signal (); | |
739b3bf1 | 247 | fputc ('\n', rl_outstream); /* We don't want next output on this line */ |
c374ab69 MV |
248 | fclose (rl_instream); |
249 | fclose (rl_outstream); | |
250 | --in_readline; | |
251 | scm_handle_by_throw (data, tag, args); | |
252 | return SCM_UNSPECIFIED; /* never reached */ | |
253 | } | |
254 | ||
255 | static SCM | |
256 | internal_readline (SCM text) | |
257 | { | |
258 | SCM ret; | |
259 | char *s; | |
08b5e6c3 | 260 | char *prompt = SCM_UNBNDP (text) ? "" : SCM_STRING_CHARS (text); |
c374ab69 MV |
261 | |
262 | promptp = 1; | |
263 | s = readline (prompt); | |
264 | if (s) | |
265 | ret = scm_makfrom0str (s); | |
266 | else | |
267 | ret = SCM_EOF_VAL; | |
268 | ||
269 | free (s); | |
270 | ||
271 | return ret; | |
272 | } | |
273 | ||
274 | static FILE * | |
275 | stream_from_fport (SCM port, char *mode, const char *subr) | |
276 | { | |
277 | int fd; | |
278 | FILE *f; | |
279 | ||
280 | fd = dup (((struct scm_fport *) SCM_STREAM (port))->fdes); | |
281 | if (fd == -1) | |
282 | { | |
283 | --in_readline; | |
284 | scm_syserror (subr); | |
285 | } | |
286 | ||
287 | f = fdopen (fd, mode); | |
288 | if (f == NULL) | |
289 | { | |
290 | --in_readline; | |
291 | scm_syserror (subr); | |
292 | } | |
293 | ||
294 | return f; | |
295 | } | |
296 | ||
2e3d5987 MD |
297 | void |
298 | scm_readline_init_ports (SCM inp, SCM outp) | |
299 | { | |
300 | if (SCM_UNBNDP (inp)) | |
301 | inp = scm_cur_inp; | |
302 | ||
303 | if (SCM_UNBNDP (outp)) | |
304 | outp = scm_cur_outp; | |
305 | ||
379b35da | 306 | if (!SCM_OPINFPORTP (inp)) { |
2e3d5987 MD |
307 | scm_misc_error (0, |
308 | "Input port is not open or not a file port", | |
309 | SCM_EOL); | |
310 | } | |
311 | ||
379b35da | 312 | if (!SCM_OPOUTFPORTP (outp)) { |
2e3d5987 MD |
313 | scm_misc_error (0, |
314 | "Output port is not open or not a file port", | |
315 | SCM_EOL); | |
316 | } | |
317 | ||
318 | input_port = inp; | |
f48e47b9 GB |
319 | rl_instream = stream_from_fport (inp, "r", s_scm_readline); |
320 | rl_outstream = stream_from_fport (outp, "w", s_scm_readline); | |
2e3d5987 MD |
321 | } |
322 | ||
c374ab69 | 323 | |
c374ab69 | 324 | |
b916d813 | 325 | SCM_DEFINE (scm_add_history, "add-history", 1, 0, 0, |
f48e47b9 GB |
326 | (SCM text), |
327 | "") | |
328 | #define FUNC_NAME s_scm_add_history | |
c374ab69 MV |
329 | { |
330 | char* s; | |
cbaee92a | 331 | SCM_VALIDATE_STRING (1,text); |
08b5e6c3 | 332 | SCM_STRING_COERCE_0TERMINATION_X (text); |
c374ab69 | 333 | |
08b5e6c3 | 334 | s = SCM_STRING_CHARS (text); |
c374ab69 MV |
335 | add_history (strdup (s)); |
336 | ||
337 | return SCM_UNSPECIFIED; | |
338 | } | |
f48e47b9 | 339 | #undef FUNC_NAME |
c374ab69 MV |
340 | |
341 | ||
b916d813 | 342 | SCM_DEFINE (scm_read_history, "read-history", 1, 0, 0, |
f48e47b9 GB |
343 | (SCM file), |
344 | "") | |
345 | #define FUNC_NAME s_scm_read_history | |
c374ab69 | 346 | { |
cbaee92a | 347 | SCM_VALIDATE_STRING (1,file); |
08b5e6c3 | 348 | return SCM_NEGATE_BOOL (read_history (SCM_STRING_CHARS (file))); |
c374ab69 | 349 | } |
f48e47b9 | 350 | #undef FUNC_NAME |
c374ab69 MV |
351 | |
352 | ||
b916d813 | 353 | SCM_DEFINE (scm_write_history, "write-history", 1, 0, 0, |
f48e47b9 GB |
354 | (SCM file), |
355 | "") | |
356 | #define FUNC_NAME s_scm_write_history | |
c374ab69 | 357 | { |
cbaee92a | 358 | SCM_VALIDATE_STRING (1,file); |
08b5e6c3 | 359 | return SCM_NEGATE_BOOL (write_history (SCM_STRING_CHARS (file))); |
c374ab69 | 360 | } |
f48e47b9 | 361 | #undef FUNC_NAME |
c374ab69 MV |
362 | |
363 | ||
b916d813 | 364 | SCM_DEFINE (scm_filename_completion_function, "filename-completion-function", 2, 0, 0, |
f48e47b9 GB |
365 | (SCM text, SCM continuep), |
366 | "") | |
367 | #define FUNC_NAME s_scm_filename_completion_function | |
c374ab69 MV |
368 | { |
369 | char *s; | |
370 | SCM ans; | |
cbaee92a | 371 | SCM_VALIDATE_STRING (1,text); |
08b5e6c3 DH |
372 | SCM_STRING_COERCE_0TERMINATION_X (text); |
373 | s = filename_completion_function (SCM_STRING_CHARS (text), SCM_NFALSEP (continuep)); | |
c374ab69 MV |
374 | ans = scm_makfrom0str (s); |
375 | free (s); | |
376 | return ans; | |
377 | } | |
f48e47b9 | 378 | #undef FUNC_NAME |
c374ab69 MV |
379 | |
380 | /* | |
381 | * The following has been modified from code contributed by | |
382 | * Andrew Archibald <aarchiba@undergrad.math.uwaterloo.ca> | |
383 | */ | |
384 | ||
385 | SCM scm_readline_completion_function_var; | |
386 | ||
387 | static char * | |
388 | completion_function (char *text, int continuep) | |
389 | { | |
390 | SCM compfunc = SCM_CDR (scm_readline_completion_function_var); | |
391 | SCM res; | |
392 | ||
393 | if (SCM_FALSEP (compfunc)) | |
394 | return NULL; /* #f => completion disabled */ | |
395 | else | |
396 | { | |
397 | SCM t = scm_makfrom0str (text); | |
398 | SCM c = continuep ? SCM_BOOL_T : SCM_BOOL_F; | |
399 | res = scm_apply (compfunc, SCM_LIST2 (t, c), SCM_EOL); | |
400 | ||
401 | if (SCM_FALSEP (res)) | |
402 | return NULL; | |
403 | ||
379b35da | 404 | if (!SCM_STRINGP (res)) |
f48e47b9 | 405 | scm_misc_error (s_scm_readline, |
c374ab69 MV |
406 | "Completion function returned bogus value: %S", |
407 | SCM_LIST1 (res)); | |
08b5e6c3 DH |
408 | SCM_STRING_COERCE_0TERMINATION_X (res); |
409 | return strdup (SCM_STRING_CHARS (res)); | |
c374ab69 MV |
410 | } |
411 | } | |
412 | ||
413 | /*Bouncing parenthesis (reimplemented by GH, 11/23/98, since readline is strict gpl)*/ | |
414 | ||
576cdec4 MD |
415 | static int match_paren (int x, int k); |
416 | static int find_matching_paren (int k); | |
417 | static void init_bouncing_parens (); | |
c374ab69 MV |
418 | |
419 | static void | |
576cdec4 | 420 | init_bouncing_parens () |
c374ab69 | 421 | { |
576cdec4 MD |
422 | if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2)) |
423 | { | |
424 | rl_bind_key (')', match_paren); | |
425 | rl_bind_key (']', match_paren); | |
426 | rl_bind_key ('}', match_paren); | |
427 | } | |
c374ab69 MV |
428 | } |
429 | ||
430 | static int | |
431 | find_matching_paren(int k) | |
432 | { | |
433 | register int i; | |
434 | register char c = 0; | |
435 | int end_parens_found = 0; | |
436 | ||
437 | /* Choose the corresponding opening bracket. */ | |
438 | if (k == ')') c = '('; | |
439 | else if (k == ']') c = '['; | |
440 | else if (k == '}') c = '{'; | |
441 | ||
442 | for (i=rl_point-2; i>=0; i--) | |
443 | { | |
444 | /* Is the current character part of a character literal? */ | |
445 | if (i - 2 >= 0 | |
446 | && rl_line_buffer[i - 1] == '\\' | |
447 | && rl_line_buffer[i - 2] == '#') | |
448 | ; | |
449 | else if (rl_line_buffer[i] == k) | |
450 | end_parens_found++; | |
451 | else if (rl_line_buffer[i] == '"') | |
452 | { | |
453 | /* Skip over a string literal. */ | |
454 | for (i--; i >= 0; i--) | |
455 | if (rl_line_buffer[i] == '"' | |
456 | && ! (i - 1 >= 0 | |
457 | && rl_line_buffer[i - 1] == '\\')) | |
458 | break; | |
459 | } | |
460 | else if (rl_line_buffer[i] == c) | |
461 | { | |
576cdec4 MD |
462 | if (end_parens_found==0) |
463 | return i; | |
c374ab69 MV |
464 | else --end_parens_found; |
465 | } | |
466 | } | |
467 | return -1; | |
468 | } | |
469 | ||
576cdec4 MD |
470 | static int |
471 | match_paren (int x, int k) | |
c374ab69 | 472 | { |
bc858b80 | 473 | int tmp, fno; |
aba2031a | 474 | SELECT_TYPE readset; |
c374ab69 MV |
475 | struct timeval timeout; |
476 | ||
576cdec4 | 477 | rl_insert (x, k); |
c374ab69 | 478 | if (!SCM_READLINE_BOUNCE_PARENS) |
576cdec4 | 479 | return 0; |
c374ab69 MV |
480 | |
481 | /* Did we just insert a quoted paren? If so, then don't bounce. */ | |
482 | if (rl_point - 1 >= 1 | |
483 | && rl_line_buffer[rl_point - 2] == '\\') | |
576cdec4 | 484 | return 0; |
c374ab69 MV |
485 | |
486 | tmp = 1000 * SCM_READLINE_BOUNCE_PARENS; | |
487 | timeout.tv_sec = tmp / 1000000; | |
488 | timeout.tv_usec = tmp % 1000000; | |
576cdec4 | 489 | FD_ZERO (&readset); |
bc858b80 MD |
490 | fno = fileno (rl_instream); |
491 | FD_SET (fno, &readset); | |
c374ab69 | 492 | |
576cdec4 MD |
493 | if (rl_point > 1) |
494 | { | |
495 | tmp = rl_point; | |
496 | rl_point = find_matching_paren (k); | |
497 | if (rl_point > -1) | |
498 | { | |
499 | rl_redisplay (); | |
bc858b80 | 500 | scm_internal_select (fno + 1, &readset, NULL, NULL, &timeout); |
576cdec4 MD |
501 | } |
502 | rl_point = tmp; | |
c374ab69 | 503 | } |
576cdec4 | 504 | return 0; |
c374ab69 MV |
505 | } |
506 | ||
b71099ba MD |
507 | #if defined (HAVE_RL_PRE_INPUT_HOOK) && defined (GUILE_SIGWINCH_SA_RESTART_CLEARED) |
508 | /* Readline disables SA_RESTART on SIGWINCH. | |
509 | * This code turns it back on. | |
510 | */ | |
511 | static int | |
512 | sigwinch_enable_restart (void) | |
513 | { | |
514 | #ifdef HAVE_SIGINTERRUPT | |
515 | siginterrupt (SIGWINCH, 0); | |
516 | #else | |
517 | struct sigaction action; | |
518 | ||
519 | sigaction (SIGWINCH, NULL, &action); | |
520 | action.sa_flags |= SA_RESTART; | |
521 | sigaction (SIGWINCH, &action, NULL); | |
522 | #endif | |
523 | return 0; | |
524 | } | |
525 | #endif | |
526 | ||
26047451 MD |
527 | #endif /* HAVE_RL_GETC_FUNCTION */ |
528 | ||
c374ab69 MV |
529 | void |
530 | scm_init_readline () | |
531 | { | |
62947883 | 532 | #ifdef HAVE_RL_GETC_FUNCTION |
a0599745 | 533 | #include "guile-readline/readline.x" |
c374ab69 MV |
534 | scm_readline_completion_function_var |
535 | = scm_sysintern ("*readline-completion-function*", SCM_BOOL_F); | |
536 | rl_getc_function = current_input_getc; | |
537 | rl_redisplay_function = redisplay; | |
538 | rl_completion_entry_function = (Function*) completion_function; | |
539 | rl_basic_word_break_characters = "\t\n\"'`;()"; | |
5c11cc9d | 540 | rl_readline_name = "Guile"; |
b71099ba MD |
541 | #if defined (HAVE_RL_PRE_INPUT_HOOK) && defined (GUILE_SIGWINCH_SA_RESTART_CLEARED) |
542 | rl_pre_input_hook = sigwinch_enable_restart; | |
543 | #endif | |
5c11cc9d | 544 | |
c374ab69 | 545 | #ifdef USE_THREADS |
b74b1a63 | 546 | scm_mutex_init (&reentry_barrier_mutex); |
c374ab69 MV |
547 | #endif |
548 | scm_init_opts (scm_readline_options, | |
549 | scm_readline_opts, | |
550 | SCM_N_READLINE_OPTIONS); | |
551 | init_bouncing_parens(); | |
552 | scm_add_feature ("readline"); | |
62947883 | 553 | #endif /* HAVE_RL_GETC_FUNCTION */ |
c374ab69 MV |
554 | } |
555 | ||
89e00824 ML |
556 | /* |
557 | Local Variables: | |
558 | c-file-style: "gnu" | |
559 | End: | |
560 | */ |