libguile/ports.h

   1 /* classes: h_files */
   2
   3 #ifndef SCM_PORTS_H
   4 #define SCM_PORTS_H
   5
   6 /* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004,
   7  *   2006, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public License
  11  * as published by the Free Software Foundation; either version 3 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  22  * 02110-1301 USA
  23  */
  24
  25 \f
  26
  27 #include "libguile/__scm.h"
  28
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <unistd.h>
  32 #include "libguile/gc.h"
  33 #include "libguile/tags.h"
  34 #include "libguile/error.h"
  35 #include "libguile/print.h"
  36 #include "libguile/struct.h"
  37 #include "libguile/threads.h"
  38 #include "libguile/strings.h"
  39
  40 \f
  41
  42 #define SCM_INITIAL_PUTBACK_BUF_SIZE 4
  43
  44 /* values for the rw_active flag.  */
  45 typedef enum scm_t_port_rw_active {
  46   SCM_PORT_NEITHER = 0,
  47   SCM_PORT_READ = 1,
  48   SCM_PORT_WRITE = 2
  49 } scm_t_port_rw_active;
  50
  51 typedef enum scm_t_port_encoding_mode {
  52   SCM_PORT_ENCODING_MODE_UTF8,
  53   SCM_PORT_ENCODING_MODE_LATIN1,
  54   SCM_PORT_ENCODING_MODE_ICONV
  55 } scm_t_port_encoding_mode;
  56
  57 /* This is a separate object so that only those ports that use iconv
  58    cause finalizers to be registered.  */
  59 typedef struct scm_t_iconv_descriptors
  60 {
  61   /* input/output iconv conversion descriptors */
  62   void *input_cd;
  63   void *output_cd;
  64 } scm_t_iconv_descriptors;
  65
  66 /* C representation of a Scheme port.  */
  67
  68 typedef struct
  69 {
  70   SCM port;                     /* Link back to the port object.  */
  71   scm_i_pthread_mutex_t *lock;  /* A recursive lock for this port.  */
  72
  73   /* data for the underlying port implementation as a raw C value. */
  74   scm_t_bits stream;
  75
  76   SCM file_name;                /* debugging support.  */
  77   long line_number;             /* debugging support.  */
  78   int column_number;            /* debugging support.  */
  79
  80   /* port buffers.  the buffer(s) are set up for all ports.
  81      in the case of string ports, the buffer is the string itself.
  82      in the case of unbuffered file ports, the buffer is a
  83      single char: shortbuf.  */
  84
  85   /* this buffer is filled from read_buf to read_end using the ptob
  86      buffer_fill.  then input requests are taken from read_pos until
  87      it reaches read_end.  */
  88
  89   unsigned char *read_buf;      /* buffer start.  */
  90   const unsigned char *read_pos;/* the next unread char.  */
  91   unsigned char *read_end;      /* pointer to last buffered char + 1.  */
  92   scm_t_off read_buf_size;              /* size of the buffer.  */
  93
  94   /* when chars are put back into the buffer, e.g., using peek-char or
  95      unread-string, the read-buffer pointers are switched to cbuf.
  96      the original pointers are saved here and restored when the put-back
  97      chars have been consumed.  */
  98   unsigned char *saved_read_buf;
  99   const unsigned char *saved_read_pos;
 100   unsigned char *saved_read_end;
 101   scm_t_off saved_read_buf_size;
 102
 103   /* write requests are saved into this buffer at write_pos until it
 104      reaches write_buf + write_buf_size, then the ptob flush is
 105      called.  */
 106
 107   unsigned char *write_buf;     /* buffer start.  */
 108   unsigned char *write_pos;     /* pointer to last buffered char + 1.  */
 109   unsigned char *write_end;     /* pointer to end of buffer + 1.  */
 110   scm_t_off write_buf_size;             /* size of the buffer.  */
 111
 112   unsigned char shortbuf;       /* buffer for "unbuffered" streams.  */
 113
 114   int rw_random;                /* true if the port is random access.
 115                                    implies that the buffers must be
 116                                    flushed before switching between
 117                                    reading and writing, seeking, etc.  */
 118
 119   scm_t_port_rw_active rw_active; /* for random access ports,
 120                                      indicates which of the buffers
 121                                      is currently in use.  can be
 122                                      SCM_PORT_WRITE, SCM_PORT_READ,
 123                                      or SCM_PORT_NEITHER.  */
 124
 125
 126   /* a buffer for un-read chars and strings.  */
 127   unsigned char *putback_buf;
 128   size_t putback_buf_size;        /* allocated size of putback_buf.  */
 129
 130   /* Character encoding support  */
 131   char *encoding;
 132   scm_t_port_encoding_mode encoding_mode;
 133   scm_t_string_failed_conversion_handler ilseq_handler;
 134   scm_t_iconv_descriptors *iconv_descriptors;
 135
 136   /* an alist for storing additional information
 137      (e.g. used to store per-port read options) */
 138   SCM alist;
 139 } scm_t_port;
 140
 141
 142 SCM_INTERNAL SCM scm_i_port_weak_set;
 143
 144
 145 #define SCM_READ_BUFFER_EMPTY_P(c_port) (c_port->read_pos >= c_port->read_end)
 146
 147 \f
 148
 149 #define SCM_EOF_OBJECT_P(x) (scm_is_eq ((x), SCM_EOF_VAL))
 150
 151 /* PORT FLAGS
 152  * A set of flags characterizes a port.
 153  * Note that we reserve the bits 1 << 24 and above for use by the
 154  * routines in the port's scm_ptobfuns structure.
 155  */
 156 #define SCM_OPN         (1L<<16) /* Is the port open? */
 157 #define SCM_RDNG        (2L<<16) /* Is it a readable port? */
 158 #define SCM_WRTNG       (4L<<16) /* Is it writable? */
 159 #define SCM_BUF0        (8L<<16) /* Is it unbuffered? */
 160 #define SCM_BUFLINE     (64L<<16) /* Is it line-buffered? */
 161
 162 #define SCM_PORTP(x) (SCM_HAS_TYP7 (x, scm_tc7_port))
 163 #define SCM_OPPORTP(x) (SCM_PORTP (x) && (SCM_CELL_WORD_0 (x) & SCM_OPN))
 164 #define SCM_INPUT_PORT_P(x) (SCM_PORTP (x) && (SCM_CELL_WORD_0 (x) & SCM_RDNG))
 165 #define SCM_OUTPUT_PORT_P(x) (SCM_PORTP (x) && (SCM_CELL_WORD_0 (x) & SCM_WRTNG))
 166 #define SCM_OPINPORTP(x) (SCM_OPPORTP (x) && SCM_INPUT_PORT_P (x))
 167 #define SCM_OPOUTPORTP(x) (SCM_OPPORTP (x) && SCM_OUTPUT_PORT_P (x))
 168 #define SCM_OPENP(x) (SCM_OPPORTP (x))
 169 #define SCM_CLOSEDP(x) (!SCM_OPENP (x))
 170 #define SCM_CLR_PORT_OPEN_FLAG(p) \
 171   SCM_SET_CELL_WORD_0 ((p), SCM_CELL_WORD_0 (p) & ~SCM_OPN)
 172
 173 #define SCM_PTAB_ENTRY(x)         ((scm_t_port *) SCM_CELL_WORD_1 (x))
 174 #define SCM_PORT_DESCRIPTOR(port) ((scm_t_ptob_descriptor *) SCM_CELL_WORD_2 (port))
 175 #define SCM_SETPTAB_ENTRY(x, ent)  (SCM_SET_CELL_WORD_1 ((x), (scm_t_bits) (ent)))
 176 #define SCM_STREAM(x)             (SCM_PTAB_ENTRY(x)->stream)
 177 #define SCM_SETSTREAM(x, s)        (SCM_PTAB_ENTRY(x)->stream = (scm_t_bits) (s))
 178 #define SCM_FILENAME(x)           (SCM_PTAB_ENTRY(x)->file_name)
 179 #define SCM_SET_FILENAME(x, n)    (SCM_PTAB_ENTRY(x)->file_name = (n))
 180 #define SCM_LINUM(x)              (SCM_PTAB_ENTRY(x)->line_number)
 181 #define SCM_COL(x)                (SCM_PTAB_ENTRY(x)->column_number)
 182
 183 #define SCM_INCLINE(port)       do {SCM_LINUM (port) += 1; SCM_COL (port) = 0;} while (0)
 184 #define SCM_ZEROCOL(port)       do {SCM_COL (port) = 0;} while (0)
 185 #define SCM_INCCOL(port)        do {SCM_COL (port) += 1;} while (0)
 186 #define SCM_DECCOL(port)        do {if (SCM_COL (port) > 0) SCM_COL (port) -= 1;} while (0)
 187 #define SCM_TABCOL(port)        do {SCM_COL (port) += 8 - SCM_COL (port) % 8;} while (0)
 188
 189 /* Maximum number of port types.  */
 190 #define SCM_I_MAX_PORT_TYPE_COUNT  256
 191
 192 \f
 193
 194 typedef enum scm_t_port_type_flags {
 195   SCM_PORT_TYPE_HAS_FLUSH = 1 << 0
 196 } scm_t_port_type_flags;
 197
 198 /* port-type description.  */
 199 typedef struct scm_t_ptob_descriptor
 200 {
 201   char *name;
 202   SCM (*mark) (SCM);
 203   size_t (*free) (SCM);
 204   int (*print) (SCM exp, SCM port, scm_print_state *pstate);
 205   SCM (*equalp) (SCM, SCM);
 206   int (*close) (SCM port);
 207
 208   void (*write) (SCM port, const void *data, size_t size);
 209   void (*flush) (SCM port);
 210
 211   void (*end_input) (SCM port, int offset);
 212   int (*fill_input) (SCM port);
 213   int (*input_waiting) (SCM port);
 214
 215   scm_t_off (*seek) (SCM port, scm_t_off OFFSET, int WHENCE);
 216   void (*truncate) (SCM port, scm_t_off length);
 217
 218   unsigned flags;
 219 } scm_t_ptob_descriptor;
 220
 221 #define SCM_TC2PTOBNUM(x) (0x0ff & ((x) >> 8))
 222 #define SCM_PTOBNUM(x) (SCM_TC2PTOBNUM (SCM_CELL_TYPE (x)))
 223 /* SCM_PTOBNAME can be 0 if name is missing */
 224 #define SCM_PTOBNAME(ptobnum) (scm_c_port_type_ref (ptobnum)->name)
 225
 226 /* Port types, and their vtables.  */
 227 SCM_INTERNAL long scm_c_num_port_types (void);
 228 SCM_API scm_t_ptob_descriptor* scm_c_port_type_ref (long ptobnum);
 229 SCM_API long scm_c_port_type_add_x (scm_t_ptob_descriptor *desc);
 230 SCM_API scm_t_bits scm_make_port_type (char *name,
 231                                        int (*fill_input) (SCM port),
 232                                        void (*write) (SCM port,
 233                                                       const void *data,
 234                                                       size_t size));
 235 SCM_API void scm_set_port_mark (scm_t_bits tc, SCM (*mark) (SCM));
 236 SCM_API void scm_set_port_free (scm_t_bits tc, size_t (*free) (SCM));
 237 SCM_API void scm_set_port_print (scm_t_bits tc,
 238                                  int (*print) (SCM exp,
 239                                                SCM port,
 240                                                scm_print_state *pstate));
 241 SCM_API void scm_set_port_equalp (scm_t_bits tc, SCM (*equalp) (SCM, SCM));
 242 SCM_API void scm_set_port_close (scm_t_bits tc, int (*close) (SCM));
 243
 244 SCM_API void scm_set_port_flush (scm_t_bits tc, void (*flush) (SCM port));
 245 SCM_API void scm_set_port_end_input (scm_t_bits tc,
 246                                      void (*end_input) (SCM port,
 247                                                         int offset));
 248 SCM_API void scm_set_port_seek (scm_t_bits tc,
 249                                 scm_t_off (*seek) (SCM port,
 250                                                    scm_t_off OFFSET,
 251                                                    int WHENCE));
 252 SCM_API void scm_set_port_truncate (scm_t_bits tc,
 253                                     void (*truncate) (SCM port,
 254                                                       scm_t_off length));
 255 SCM_API void scm_set_port_input_waiting (scm_t_bits tc, int (*input_waiting) (SCM));
 256
 257 /* The input, output, error, and load ports.  */
 258 SCM_API SCM scm_current_input_port (void);
 259 SCM_API SCM scm_current_output_port (void);
 260 SCM_API SCM scm_current_error_port (void);
 261 SCM_API SCM scm_current_warning_port (void);
 262 SCM_API SCM scm_current_load_port (void);
 263 SCM_API SCM scm_set_current_input_port (SCM port);
 264 SCM_API SCM scm_set_current_output_port (SCM port);
 265 SCM_API SCM scm_set_current_error_port (SCM port);
 266 SCM_API SCM scm_set_current_warning_port (SCM port);
 267 SCM_API void scm_dynwind_current_input_port (SCM port);
 268 SCM_API void scm_dynwind_current_output_port (SCM port);
 269 SCM_API void scm_dynwind_current_error_port (SCM port);
 270 SCM_INTERNAL void scm_i_dynwind_current_load_port (SCM port);
 271
 272 /* Mode bits.  */
 273 SCM_INTERNAL long scm_i_mode_bits (SCM modes);
 274 SCM_API long scm_mode_bits (char *modes);
 275 SCM_API SCM scm_port_mode (SCM port);
 276
 277 /* Low-level constructors.  */
 278 SCM_API SCM
 279 scm_c_make_port_with_encoding (scm_t_bits tag,
 280                                unsigned long mode_bits,
 281                                const char *encoding,
 282                                scm_t_string_failed_conversion_handler handler,
 283                                scm_t_bits stream);
 284 SCM_API SCM scm_c_make_port (scm_t_bits tag, unsigned long mode_bits,
 285                              scm_t_bits stream);
 286 SCM_API SCM scm_new_port_table_entry (scm_t_bits tag);
 287
 288 /* Predicates.  */
 289 SCM_API SCM scm_port_p (SCM x);
 290 SCM_API SCM scm_input_port_p (SCM x);
 291 SCM_API SCM scm_output_port_p (SCM x);
 292 SCM_API SCM scm_port_closed_p (SCM port);
 293 SCM_API SCM scm_eof_object_p (SCM x);
 294
 295 /* Closing ports.  */
 296 SCM_API SCM scm_close_port (SCM port);
 297 SCM_API SCM scm_close_input_port (SCM port);
 298 SCM_API SCM scm_close_output_port (SCM port);
 299
 300 /* Encoding characters to byte streams, and decoding byte streams to
 301    characters.  */
 302 SCM_INTERNAL const char *scm_i_default_port_encoding (void);
 303 SCM_INTERNAL void scm_i_set_default_port_encoding (const char *);
 304 SCM_INTERNAL scm_t_string_failed_conversion_handler
 305 scm_i_default_port_conversion_handler (void);
 306 SCM_INTERNAL void
 307 scm_i_set_default_port_conversion_handler (scm_t_string_failed_conversion_handler);
 308 SCM_INTERNAL scm_t_iconv_descriptors *scm_i_port_iconv_descriptors (SCM port);
 309 SCM_INTERNAL void scm_i_set_port_encoding_x (SCM port, const char *str);
 310 SCM_API SCM scm_port_encoding (SCM port);
 311 SCM_API SCM scm_set_port_encoding_x (SCM port, SCM encoding);
 312 SCM_API SCM scm_port_conversion_strategy (SCM port);
 313 SCM_API SCM scm_set_port_conversion_strategy_x (SCM port, SCM behavior);
 314
 315 /* Acquiring and releasing the port lock.  */
 316 SCM_API void scm_dynwind_lock_port (SCM port);
 317 SCM_INLINE int scm_c_lock_port (SCM port, scm_i_pthread_mutex_t **lock);
 318 SCM_INLINE int scm_c_try_lock_port (SCM port, scm_i_pthread_mutex_t **lock);
 319
 320 /* Input.  */
 321 SCM_API int scm_get_byte_or_eof (SCM port);
 322 SCM_INLINE int scm_get_byte_or_eof_unlocked (SCM port);
 323 SCM_API int scm_peek_byte_or_eof (SCM port);
 324 SCM_INLINE int scm_peek_byte_or_eof_unlocked (SCM port);
 325 SCM_API size_t scm_c_read (SCM port, void *buffer, size_t size);
 326 SCM_API size_t scm_c_read_unlocked (SCM port, void *buffer, size_t size);
 327 SCM_API scm_t_wchar scm_getc (SCM port);
 328 SCM_API scm_t_wchar scm_getc_unlocked (SCM port);
 329 SCM_API SCM scm_read_char (SCM port);
 330
 331 /* Pushback.  */
 332 SCM_API void scm_unget_byte (int c, SCM port);
 333 SCM_API void scm_unget_byte_unlocked (int c, SCM port);
 334 SCM_API void scm_ungetc (scm_t_wchar c, SCM port);
 335 SCM_API void scm_ungetc_unlocked (scm_t_wchar c, SCM port);
 336 SCM_API void scm_ungets (const char *s, int n, SCM port);
 337 SCM_API void scm_ungets_unlocked (const char *s, int n, SCM port);
 338 SCM_API SCM scm_peek_char (SCM port);
 339 SCM_API SCM scm_unread_char (SCM cobj, SCM port);
 340 SCM_API SCM scm_unread_string (SCM str, SCM port);
 341
 342 /* Manipulating the buffers.  */
 343 SCM_API void scm_port_non_buffer (scm_t_port *pt);
 344 SCM_API int scm_fill_input (SCM port);
 345 SCM_API int scm_fill_input_unlocked (SCM port);
 346 SCM_INTERNAL size_t scm_take_from_input_buffers (SCM port, char *dest, size_t read_len);
 347 SCM_API SCM scm_drain_input (SCM port);
 348 SCM_API void scm_end_input (SCM port);
 349 SCM_API void scm_end_input_unlocked (SCM port);
 350 SCM_API SCM scm_force_output (SCM port);
 351 SCM_API void scm_flush (SCM port);
 352 SCM_API void scm_flush_unlocked (SCM port);
 353
 354 /* Output.  */
 355 SCM_API void scm_putc (char c, SCM port);
 356 SCM_INLINE void scm_putc_unlocked (char c, SCM port);
 357 SCM_API void scm_puts (const char *str_data, SCM port);
 358 SCM_INLINE void scm_puts_unlocked (const char *str_data, SCM port);
 359 SCM_API void scm_c_write (SCM port, const void *buffer, size_t size);
 360 SCM_API void scm_c_write_unlocked (SCM port, const void *buffer, size_t size);
 361 SCM_API void scm_lfwrite (const char *ptr, size_t size, SCM port);
 362 SCM_API void scm_lfwrite_unlocked (const char *ptr, size_t size, SCM port);
 363 SCM_INTERNAL void scm_lfwrite_substr (SCM str, size_t start, size_t end,
 364                                       SCM port);
 365
 366 /* Querying and setting positions, and character availability.  */
 367 SCM_API SCM scm_char_ready_p (SCM port);
 368 SCM_API SCM scm_seek (SCM object, SCM offset, SCM whence);
 369 SCM_API SCM scm_truncate_file (SCM object, SCM length);
 370 SCM_API SCM scm_port_line (SCM port);
 371 SCM_API SCM scm_set_port_line_x (SCM port, SCM line);
 372 SCM_API SCM scm_port_column (SCM port);
 373 SCM_API SCM scm_set_port_column_x (SCM port, SCM line);
 374 SCM_API SCM scm_port_filename (SCM port);
 375 SCM_API SCM scm_set_port_filename_x (SCM port, SCM filename);
 376
 377 /* Implementation helpers for port printing functions.  */
 378 SCM_API int scm_port_print (SCM exp, SCM port, scm_print_state *);
 379 SCM_API void scm_print_port_mode (SCM exp, SCM port);
 380
 381 /* Iterating over all ports.  */
 382 SCM_API SCM scm_port_for_each (SCM proc);
 383 SCM_API void scm_c_port_for_each (void (*proc)(void *data, SCM p), void *data);
 384 SCM_API SCM scm_flush_all_ports (void);
 385
 386 /* Void ports.  */
 387 SCM_API SCM scm_void_port (char * mode_str);
 388 SCM_API SCM scm_sys_make_void_port (SCM mode);
 389
 390 /* Initialization.  */
 391 SCM_INTERNAL void scm_init_ports (void);
 392
 393
 394 /* Inline function implementations.  */
 395
 396 #if SCM_CAN_INLINE || defined SCM_INLINE_C_IMPLEMENTING_INLINES
 397 SCM_INLINE_IMPLEMENTATION int
 398 scm_c_lock_port (SCM port, scm_i_pthread_mutex_t **lock)
 399 {
 400   *lock = SCM_PTAB_ENTRY (port)->lock;
 401
 402   if (*lock)
 403     return scm_i_pthread_mutex_lock (*lock);
 404   else
 405     return 0;
 406 }
 407
 408 SCM_INLINE_IMPLEMENTATION int
 409 scm_c_try_lock_port (SCM port, scm_i_pthread_mutex_t **lock)
 410 {
 411   *lock = SCM_PTAB_ENTRY (port)->lock;
 412   if (*lock)
 413     {
 414       int ret = scm_i_pthread_mutex_trylock (*lock);
 415       if (ret != 0)
 416         *lock = NULL;
 417       return ret;
 418     }
 419   else
 420     return 0;
 421 }
 422
 423 SCM_INLINE_IMPLEMENTATION int
 424 scm_get_byte_or_eof_unlocked (SCM port)
 425 {
 426   int c;
 427   scm_t_port *pt = SCM_PTAB_ENTRY (port);
 428
 429   if (pt->rw_active == SCM_PORT_WRITE)
 430     /* may be marginally faster than calling scm_flush.  */
 431     SCM_PORT_DESCRIPTOR (port)->flush (port);
 432
 433   if (pt->rw_random)
 434     pt->rw_active = SCM_PORT_READ;
 435
 436   if (pt->read_pos >= pt->read_end)
 437     {
 438       if (SCM_UNLIKELY (scm_fill_input_unlocked (port) == EOF))
 439         return EOF;
 440     }
 441
 442   c = *(pt->read_pos++);
 443
 444   return c;
 445 }
 446
 447 /* Like `scm_get_byte_or_eof' but does not change PORT's `read_pos'.  */
 448 SCM_INLINE_IMPLEMENTATION int
 449 scm_peek_byte_or_eof_unlocked (SCM port)
 450 {
 451   int c;
 452   scm_t_port *pt = SCM_PTAB_ENTRY (port);
 453
 454   if (pt->rw_active == SCM_PORT_WRITE)
 455     /* may be marginally faster than calling scm_flush.  */
 456     SCM_PORT_DESCRIPTOR (port)->flush (port);
 457
 458   if (pt->rw_random)
 459     pt->rw_active = SCM_PORT_READ;
 460
 461   if (pt->read_pos >= pt->read_end)
 462     {
 463       if (SCM_UNLIKELY (scm_fill_input_unlocked (port) == EOF))
 464         return EOF;
 465     }
 466
 467   c = *pt->read_pos;
 468
 469   return c;
 470 }
 471
 472 SCM_INLINE_IMPLEMENTATION void
 473 scm_putc_unlocked (char c, SCM port)
 474 {
 475   SCM_ASSERT_TYPE (SCM_OPOUTPORTP (port), port, 0, NULL, "output port");
 476   scm_lfwrite_unlocked (&c, 1, port);
 477 }
 478
 479 SCM_INLINE_IMPLEMENTATION void
 480 scm_puts_unlocked (const char *s, SCM port)
 481 {
 482   SCM_ASSERT_TYPE (SCM_OPOUTPORTP (port), port, 0, NULL, "output port");
 483   scm_lfwrite_unlocked (s, strlen (s), port);
 484 }
 485 #endif  /* SCM_CAN_INLINE || defined SCM_INLINE_C_IMPLEMENTING_INLINES */
 486
 487 #endif  /* SCM_PORTS_H */
 488
 489 /*
 490   Local Variables:
 491   c-file-style: "gnu"
 492   End:
 493 */