1 /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2003, 2004, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
3 * This library is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU Lesser General Public License
5 * as published by the Free Software Foundation; either version 3 of
6 * the License, or (at your option) any later version.
8 * This library is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * Lesser General Public License for more details.
13 * You should have received a copy of the GNU Lesser General Public
14 * License along with this library; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 #define _LARGEFILE64_SOURCE /* ask for stat64 etc */
31 #include <fcntl.h> /* for chsize on mingw */
35 #include <striconveh.h>
39 #include "libguile/_scm.h"
40 #include "libguile/async.h"
41 #include "libguile/eval.h"
42 #include "libguile/fports.h" /* direct access for seek and truncate */
43 #include "libguile/goops.h"
44 #include "libguile/smob.h"
45 #include "libguile/chars.h"
46 #include "libguile/dynwind.h"
48 #include "libguile/keywords.h"
49 #include "libguile/hashtab.h"
50 #include "libguile/root.h"
51 #include "libguile/strings.h"
52 #include "libguile/mallocs.h"
53 #include "libguile/validate.h"
54 #include "libguile/ports.h"
55 #include "libguile/vectors.h"
56 #include "libguile/weaks.h"
57 #include "libguile/fluids.h"
58 #include "libguile/eq.h"
72 #ifdef HAVE_SYS_IOCTL_H
73 #include <sys/ioctl.h>
76 /* Mingw (version 3.4.5, circa 2006) has ftruncate as an alias for chsize
77 already, but have this code here in case that wasn't so in past versions,
78 or perhaps to help other minimal DOS environments.
80 gnulib ftruncate.c has code using fcntl F_CHSIZE and F_FREESP, which
81 might be possibilities if we've got other systems without ftruncate. */
83 #if defined HAVE_CHSIZE && ! defined HAVE_FTRUNCATE
84 #define ftruncate(fd, size) chsize (fd, size)
86 #define HAVE_FTRUNCATE 1
90 /* The port kind table --- a dynamically resized array of port types. */
93 /* scm_ptobs scm_numptob
94 * implement a dynamically resized array of ptob records.
95 * Indexes into this table are used when generating type
96 * tags for smobjects (if you know a tag you can get an index and conversely).
98 scm_t_ptob_descriptor
*scm_ptobs
= NULL
;
101 /* GC marker for a port with stream of SCM type. */
103 scm_markstream (SCM ptr
)
106 openp
= SCM_CELL_WORD_0 (ptr
) & SCM_OPN
;
108 return SCM_PACK (SCM_STREAM (ptr
));
114 * We choose to use an interface similar to the smob interface with
115 * fill_input and write as standard fields, passed to the port
116 * type constructor, and optional fields set by setters.
120 flush_port_default (SCM port SCM_UNUSED
)
125 end_input_default (SCM port SCM_UNUSED
, int offset SCM_UNUSED
)
130 scm_make_port_type (char *name
,
131 int (*fill_input
) (SCM port
),
132 void (*write
) (SCM port
, const void *data
, size_t size
))
135 if (SCM_I_MAX_PORT_TYPE_COUNT
- 1 <= scm_numptob
)
137 SCM_CRITICAL_SECTION_START
;
138 tmp
= (char *) scm_gc_realloc ((char *) scm_ptobs
,
139 scm_numptob
* sizeof (scm_t_ptob_descriptor
),
141 * sizeof (scm_t_ptob_descriptor
),
145 scm_ptobs
= (scm_t_ptob_descriptor
*) tmp
;
147 scm_ptobs
[scm_numptob
].name
= name
;
148 scm_ptobs
[scm_numptob
].mark
= 0;
149 scm_ptobs
[scm_numptob
].free
= NULL
;
150 scm_ptobs
[scm_numptob
].print
= scm_port_print
;
151 scm_ptobs
[scm_numptob
].equalp
= 0;
152 scm_ptobs
[scm_numptob
].close
= 0;
154 scm_ptobs
[scm_numptob
].write
= write
;
155 scm_ptobs
[scm_numptob
].flush
= flush_port_default
;
157 scm_ptobs
[scm_numptob
].end_input
= end_input_default
;
158 scm_ptobs
[scm_numptob
].fill_input
= fill_input
;
159 scm_ptobs
[scm_numptob
].input_waiting
= 0;
161 scm_ptobs
[scm_numptob
].seek
= 0;
162 scm_ptobs
[scm_numptob
].truncate
= 0;
166 SCM_CRITICAL_SECTION_END
;
170 scm_memory_error ("scm_make_port_type");
172 /* Make a class object if Goops is present */
173 if (SCM_UNPACK (scm_port_class
[0]) != 0)
174 scm_make_port_classes (scm_numptob
- 1, SCM_PTOBNAME (scm_numptob
- 1));
175 return scm_tc7_port
+ (scm_numptob
- 1) * 256;
179 scm_set_port_mark (scm_t_bits tc
, SCM (*mark
) (SCM
))
181 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].mark
= mark
;
185 scm_set_port_free (scm_t_bits tc
, size_t (*free
) (SCM
))
187 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].free
= free
;
191 scm_set_port_print (scm_t_bits tc
, int (*print
) (SCM exp
, SCM port
,
192 scm_print_state
*pstate
))
194 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].print
= print
;
198 scm_set_port_equalp (scm_t_bits tc
, SCM (*equalp
) (SCM
, SCM
))
200 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].equalp
= equalp
;
204 scm_set_port_flush (scm_t_bits tc
, void (*flush
) (SCM port
))
206 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].flush
= flush
;
210 scm_set_port_end_input (scm_t_bits tc
, void (*end_input
) (SCM port
, int offset
))
212 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].end_input
= end_input
;
216 scm_set_port_close (scm_t_bits tc
, int (*close
) (SCM
))
218 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].close
= close
;
222 scm_set_port_seek (scm_t_bits tc
,
223 scm_t_off (*seek
) (SCM
, scm_t_off
, int))
225 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].seek
= seek
;
229 scm_set_port_truncate (scm_t_bits tc
, void (*truncate
) (SCM
, scm_t_off
))
231 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].truncate
= truncate
;
235 scm_set_port_input_waiting (scm_t_bits tc
, int (*input_waiting
) (SCM
))
237 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].input_waiting
= input_waiting
;
242 SCM_DEFINE (scm_char_ready_p
, "char-ready?", 0, 1, 0,
244 "Return @code{#t} if a character is ready on input @var{port}\n"
245 "and return @code{#f} otherwise. If @code{char-ready?} returns\n"
246 "@code{#t} then the next @code{read-char} operation on\n"
247 "@var{port} is guaranteed not to hang. If @var{port} is a file\n"
248 "port at end of file then @code{char-ready?} returns @code{#t}.\n"
250 "@code{char-ready?} exists to make it possible for a\n"
251 "program to accept characters from interactive ports without\n"
252 "getting stuck waiting for input. Any input editors associated\n"
253 "with such ports must make sure that characters whose existence\n"
254 "has been asserted by @code{char-ready?} cannot be rubbed out.\n"
255 "If @code{char-ready?} were to return @code{#f} at end of file,\n"
256 "a port at end of file would be indistinguishable from an\n"
257 "interactive port that has no ready characters.")
258 #define FUNC_NAME s_scm_char_ready_p
262 if (SCM_UNBNDP (port
))
263 port
= scm_current_input_port ();
264 /* It's possible to close the current input port, so validate even in
266 SCM_VALIDATE_OPINPORT (1, port
);
268 pt
= SCM_PTAB_ENTRY (port
);
270 /* if the current read buffer is filled, or the
271 last pushed-back char has been read and the saved buffer is
272 filled, result is true. */
273 if (pt
->read_pos
< pt
->read_end
274 || (pt
->read_buf
== pt
->putback_buf
275 && pt
->saved_read_pos
< pt
->saved_read_end
))
279 scm_t_ptob_descriptor
*ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
281 if (ptob
->input_waiting
)
282 return scm_from_bool(ptob
->input_waiting (port
));
289 /* move up to read_len chars from port's putback and/or read buffers
290 into memory starting at dest. returns the number of chars moved. */
291 size_t scm_take_from_input_buffers (SCM port
, char *dest
, size_t read_len
)
293 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
294 size_t chars_read
= 0;
295 size_t from_buf
= min (pt
->read_end
- pt
->read_pos
, read_len
);
299 memcpy (dest
, pt
->read_pos
, from_buf
);
300 pt
->read_pos
+= from_buf
;
301 chars_read
+= from_buf
;
302 read_len
-= from_buf
;
306 /* if putback was active, try the real input buffer too. */
307 if (pt
->read_buf
== pt
->putback_buf
)
309 from_buf
= min (pt
->saved_read_end
- pt
->saved_read_pos
, read_len
);
312 memcpy (dest
, pt
->saved_read_pos
, from_buf
);
313 pt
->saved_read_pos
+= from_buf
;
314 chars_read
+= from_buf
;
320 /* Clear a port's read buffers, returning the contents. */
321 SCM_DEFINE (scm_drain_input
, "drain-input", 1, 0, 0,
323 "This procedure clears a port's input buffers, similar\n"
324 "to the way that force-output clears the output buffer. The\n"
325 "contents of the buffers are returned as a single string, e.g.,\n"
328 "(define p (open-input-file ...))\n"
329 "(drain-input p) => empty string, nothing buffered yet.\n"
330 "(unread-char (read-char p) p)\n"
331 "(drain-input p) => initial chars from p, up to the buffer size.\n"
333 "Draining the buffers may be useful for cleanly finishing\n"
334 "buffered I/O so that the file descriptor can be used directly\n"
335 "for further input.")
336 #define FUNC_NAME s_scm_drain_input
343 SCM_VALIDATE_OPINPORT (1, port
);
344 pt
= SCM_PTAB_ENTRY (port
);
346 count
= pt
->read_end
- pt
->read_pos
;
347 if (pt
->read_buf
== pt
->putback_buf
)
348 count
+= pt
->saved_read_end
- pt
->saved_read_pos
;
350 result
= scm_i_make_string (count
, &data
);
351 scm_take_from_input_buffers (port
, data
, count
);
357 /* Standard ports --- current input, output, error, and more(!). */
359 static SCM cur_inport_fluid
= 0;
360 static SCM cur_outport_fluid
= 0;
361 static SCM cur_errport_fluid
= 0;
362 static SCM cur_loadport_fluid
= 0;
364 SCM_DEFINE (scm_current_input_port
, "current-input-port", 0, 0, 0,
366 "Return the current input port. This is the default port used\n"
367 "by many input procedures. Initially, @code{current-input-port}\n"
368 "returns the @dfn{standard input} in Unix and C terminology.")
369 #define FUNC_NAME s_scm_current_input_port
371 if (cur_inport_fluid
)
372 return scm_fluid_ref (cur_inport_fluid
);
378 SCM_DEFINE (scm_current_output_port
, "current-output-port", 0, 0, 0,
380 "Return the current output port. This is the default port used\n"
381 "by many output procedures. Initially,\n"
382 "@code{current-output-port} returns the @dfn{standard output} in\n"
383 "Unix and C terminology.")
384 #define FUNC_NAME s_scm_current_output_port
386 if (cur_outport_fluid
)
387 return scm_fluid_ref (cur_outport_fluid
);
393 SCM_DEFINE (scm_current_error_port
, "current-error-port", 0, 0, 0,
395 "Return the port to which errors and warnings should be sent (the\n"
396 "@dfn{standard error} in Unix and C terminology).")
397 #define FUNC_NAME s_scm_current_error_port
399 if (cur_errport_fluid
)
400 return scm_fluid_ref (cur_errport_fluid
);
406 SCM_DEFINE (scm_current_load_port
, "current-load-port", 0, 0, 0,
408 "Return the current-load-port.\n"
409 "The load port is used internally by @code{primitive-load}.")
410 #define FUNC_NAME s_scm_current_load_port
412 return scm_fluid_ref (cur_loadport_fluid
);
416 SCM_DEFINE (scm_set_current_input_port
, "set-current-input-port", 1, 0, 0,
418 "@deffnx {Scheme Procedure} set-current-output-port port\n"
419 "@deffnx {Scheme Procedure} set-current-error-port port\n"
420 "Change the ports returned by @code{current-input-port},\n"
421 "@code{current-output-port} and @code{current-error-port}, respectively,\n"
422 "so that they use the supplied @var{port} for input or output.")
423 #define FUNC_NAME s_scm_set_current_input_port
425 SCM oinp
= scm_fluid_ref (cur_inport_fluid
);
426 SCM_VALIDATE_OPINPORT (1, port
);
427 scm_fluid_set_x (cur_inport_fluid
, port
);
433 SCM_DEFINE (scm_set_current_output_port
, "set-current-output-port", 1, 0, 0,
435 "Set the current default output port to @var{port}.")
436 #define FUNC_NAME s_scm_set_current_output_port
438 SCM ooutp
= scm_fluid_ref (cur_outport_fluid
);
439 port
= SCM_COERCE_OUTPORT (port
);
440 SCM_VALIDATE_OPOUTPORT (1, port
);
441 scm_fluid_set_x (cur_outport_fluid
, port
);
447 SCM_DEFINE (scm_set_current_error_port
, "set-current-error-port", 1, 0, 0,
449 "Set the current default error port to @var{port}.")
450 #define FUNC_NAME s_scm_set_current_error_port
452 SCM oerrp
= scm_fluid_ref (cur_errport_fluid
);
453 port
= SCM_COERCE_OUTPORT (port
);
454 SCM_VALIDATE_OPOUTPORT (1, port
);
455 scm_fluid_set_x (cur_errport_fluid
, port
);
461 scm_dynwind_current_input_port (SCM port
)
462 #define FUNC_NAME NULL
464 SCM_VALIDATE_OPINPORT (1, port
);
465 scm_dynwind_fluid (cur_inport_fluid
, port
);
470 scm_dynwind_current_output_port (SCM port
)
471 #define FUNC_NAME NULL
473 port
= SCM_COERCE_OUTPORT (port
);
474 SCM_VALIDATE_OPOUTPORT (1, port
);
475 scm_dynwind_fluid (cur_outport_fluid
, port
);
480 scm_dynwind_current_error_port (SCM port
)
481 #define FUNC_NAME NULL
483 port
= SCM_COERCE_OUTPORT (port
);
484 SCM_VALIDATE_OPOUTPORT (1, port
);
485 scm_dynwind_fluid (cur_errport_fluid
, port
);
490 scm_i_dynwind_current_load_port (SCM port
)
492 scm_dynwind_fluid (cur_loadport_fluid
, port
);
496 /* The port table --- an array of pointers to ports. */
499 We need a global registry of ports to flush them all at exit, and to
500 get all the ports matching a file descriptor.
502 SCM scm_i_port_weak_hash
;
504 scm_i_pthread_mutex_t scm_i_port_table_mutex
= SCM_I_PTHREAD_MUTEX_INITIALIZER
;
507 /* Port finalization. */
510 static void finalize_port (GC_PTR
, GC_PTR
);
512 /* Register a finalizer for PORT, if needed by its port type. */
513 static SCM_C_INLINE_KEYWORD
void
514 register_finalizer_for_port (SCM port
)
518 port_type
= SCM_TC2PTOBNUM (SCM_CELL_TYPE (port
));
519 if (scm_ptobs
[port_type
].free
)
521 GC_finalization_proc prev_finalizer
;
522 GC_PTR prev_finalization_data
;
524 GC_REGISTER_FINALIZER_NO_ORDER (SCM2PTR (port
), finalize_port
, 0,
526 &prev_finalization_data
);
530 /* Finalize the object (a port) pointed to by PTR. */
532 finalize_port (GC_PTR ptr
, GC_PTR data
)
535 SCM port
= PTR2SCM (ptr
);
537 if (!SCM_PORTP (port
))
540 if (SCM_OPENP (port
))
542 if (SCM_REVEALED (port
) > 0)
543 /* Keep "revealed" ports alive and re-register a finalizer. */
544 register_finalizer_for_port (port
);
547 port_type
= SCM_TC2PTOBNUM (SCM_CELL_TYPE (port
));
548 if (port_type
>= scm_numptob
)
551 if (scm_ptobs
[port_type
].free
)
552 /* Yes, I really do mean `.free' rather than `.close'. `.close'
553 is for explicit `close-port' by user. */
554 scm_ptobs
[port_type
].free (port
);
556 SCM_SETSTREAM (port
, 0);
557 SCM_CLR_PORT_OPEN_FLAG (port
);
559 scm_gc_ports_collected
++;
568 /* This function is not and should not be thread safe. */
570 scm_new_port_table_entry (scm_t_bits tag
)
571 #define FUNC_NAME "scm_new_port_table_entry"
574 We initialize the cell to empty, this is in case scm_gc_calloc
575 triggers GC ; we don't want the GC to scan a half-finished Z.
578 SCM z
= scm_cons (SCM_EOL
, SCM_EOL
);
579 scm_t_port
*entry
= (scm_t_port
*) scm_gc_calloc (sizeof (scm_t_port
), "port");
582 entry
->file_name
= SCM_BOOL_F
;
583 entry
->rw_active
= SCM_PORT_NEITHER
;
585 /* Initialize this port with the thread's current default
587 if ((enc
= scm_i_get_port_encoding (SCM_BOOL_F
)) == NULL
)
588 entry
->encoding
= NULL
;
590 entry
->encoding
= scm_gc_strdup (enc
, "port");
591 entry
->ilseq_handler
= scm_i_get_conversion_strategy (SCM_BOOL_F
);
593 SCM_SET_CELL_TYPE (z
, tag
);
594 SCM_SETPTAB_ENTRY (z
, entry
);
596 scm_hashq_set_x (scm_i_port_weak_hash
, z
, SCM_BOOL_F
);
598 /* For each new port, register a finalizer so that it port type's free
599 function can be invoked eventually. */
600 register_finalizer_for_port (z
);
606 #if SCM_ENABLE_DEPRECATED==1
608 scm_add_to_port_table (SCM port
)
610 SCM z
= scm_new_port_table_entry (scm_tc7_port
);
611 scm_t_port
* pt
= SCM_PTAB_ENTRY(z
);
614 SCM_SETCAR (z
, SCM_EOL
);
615 SCM_SETCDR (z
, SCM_EOL
);
616 SCM_SETPTAB_ENTRY (port
, pt
);
622 /* Remove a port from the table and destroy it. */
624 /* This function is not and should not be thread safe. */
626 scm_i_remove_port (SCM port
)
627 #define FUNC_NAME "scm_remove_port"
629 scm_t_port
*p
= SCM_PTAB_ENTRY (port
);
631 scm_port_non_buffer (p
);
633 p
->putback_buf
= NULL
;
634 p
->putback_buf_size
= 0;
636 SCM_SETPTAB_ENTRY (port
, 0);
637 scm_hashq_remove_x (scm_i_port_weak_hash
, port
);
642 /* Functions for debugging. */
644 SCM_DEFINE (scm_pt_size
, "pt-size", 0, 0, 0,
646 "Return the number of ports in the port table. @code{pt-size}\n"
647 "is only included in @code{--enable-guile-debug} builds.")
648 #define FUNC_NAME s_scm_pt_size
650 return scm_from_int (SCM_HASHTABLE_N_ITEMS (scm_i_port_weak_hash
));
656 scm_port_non_buffer (scm_t_port
*pt
)
658 pt
->read_pos
= pt
->read_buf
= pt
->read_end
= &pt
->shortbuf
;
659 pt
->write_buf
= pt
->write_pos
= &pt
->shortbuf
;
660 pt
->read_buf_size
= pt
->write_buf_size
= 1;
661 pt
->write_end
= pt
->write_buf
+ pt
->write_buf_size
;
665 /* Revealed counts --- an oddity inherited from SCSH. */
667 /* Find a port in the table and return its revealed count.
668 Also used by the garbage collector.
672 scm_revealed_count (SCM port
)
674 return SCM_REVEALED(port
);
679 /* Return the revealed count for a port. */
681 SCM_DEFINE (scm_port_revealed
, "port-revealed", 1, 0, 0,
683 "Return the revealed count for @var{port}.")
684 #define FUNC_NAME s_scm_port_revealed
686 port
= SCM_COERCE_OUTPORT (port
);
687 SCM_VALIDATE_OPENPORT (1, port
);
688 return scm_from_int (scm_revealed_count (port
));
692 /* Set the revealed count for a port. */
693 SCM_DEFINE (scm_set_port_revealed_x
, "set-port-revealed!", 2, 0, 0,
694 (SCM port
, SCM rcount
),
695 "Sets the revealed count for a port to a given value.\n"
696 "The return value is unspecified.")
697 #define FUNC_NAME s_scm_set_port_revealed_x
699 port
= SCM_COERCE_OUTPORT (port
);
700 SCM_VALIDATE_OPENPORT (1, port
);
701 SCM_REVEALED (port
) = scm_to_int (rcount
);
702 return SCM_UNSPECIFIED
;
708 /* Retrieving a port's mode. */
710 /* Return the flags that characterize a port based on the mode
711 * string used to open a file for that port.
713 * See PORT FLAGS in scm.h
717 scm_i_mode_bits_n (SCM modes
)
720 | (scm_i_string_contains_char (modes
, 'r')
721 || scm_i_string_contains_char (modes
, '+') ? SCM_RDNG
: 0)
722 | (scm_i_string_contains_char (modes
, 'w')
723 || scm_i_string_contains_char (modes
, 'a')
724 || scm_i_string_contains_char (modes
, '+') ? SCM_WRTNG
: 0)
725 | (scm_i_string_contains_char (modes
, '0') ? SCM_BUF0
: 0)
726 | (scm_i_string_contains_char (modes
, 'l') ? SCM_BUFLINE
: 0));
730 scm_mode_bits (char *modes
)
732 return scm_i_mode_bits (scm_from_locale_string (modes
));
736 scm_i_mode_bits (SCM modes
)
740 if (!scm_is_string (modes
))
741 scm_wrong_type_arg_msg (NULL
, 0, modes
, "string");
743 bits
= scm_i_mode_bits_n (modes
);
744 scm_remember_upto_here_1 (modes
);
748 /* Return the mode flags from an open port.
749 * Some modes such as "append" are only used when opening
750 * a file and are not returned here. */
752 SCM_DEFINE (scm_port_mode
, "port-mode", 1, 0, 0,
754 "Return the port modes associated with the open port @var{port}.\n"
755 "These will not necessarily be identical to the modes used when\n"
756 "the port was opened, since modes such as \"append\" which are\n"
757 "used only during port creation are not retained.")
758 #define FUNC_NAME s_scm_port_mode
763 port
= SCM_COERCE_OUTPORT (port
);
764 SCM_VALIDATE_OPPORT (1, port
);
765 if (SCM_CELL_WORD_0 (port
) & SCM_RDNG
) {
766 if (SCM_CELL_WORD_0 (port
) & SCM_WRTNG
)
767 strcpy (modes
, "r+");
771 else if (SCM_CELL_WORD_0 (port
) & SCM_WRTNG
)
773 if (SCM_CELL_WORD_0 (port
) & SCM_BUF0
)
775 return scm_from_locale_string (modes
);
784 * Call the close operation on a port object.
785 * see also scm_close.
787 SCM_DEFINE (scm_close_port
, "close-port", 1, 0, 0,
789 "Close the specified port object. Return @code{#t} if it\n"
790 "successfully closes a port or @code{#f} if it was already\n"
791 "closed. An exception may be raised if an error occurs, for\n"
792 "example when flushing buffered output. See also @ref{Ports and\n"
793 "File Descriptors, close}, for a procedure which can close file\n"
795 #define FUNC_NAME s_scm_close_port
800 port
= SCM_COERCE_OUTPORT (port
);
802 SCM_VALIDATE_PORT (1, port
);
803 if (SCM_CLOSEDP (port
))
805 i
= SCM_PTOBNUM (port
);
806 if (scm_ptobs
[i
].close
)
807 rv
= (scm_ptobs
[i
].close
) (port
);
810 scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex
);
811 scm_i_remove_port (port
);
812 scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex
);
813 SCM_CLR_PORT_OPEN_FLAG (port
);
814 return scm_from_bool (rv
>= 0);
818 SCM_DEFINE (scm_close_input_port
, "close-input-port", 1, 0, 0,
820 "Close the specified input port object. The routine has no effect if\n"
821 "the file has already been closed. An exception may be raised if an\n"
822 "error occurs. The value returned is unspecified.\n\n"
823 "See also @ref{Ports and File Descriptors, close}, for a procedure\n"
824 "which can close file descriptors.")
825 #define FUNC_NAME s_scm_close_input_port
827 SCM_VALIDATE_INPUT_PORT (1, port
);
828 scm_close_port (port
);
829 return SCM_UNSPECIFIED
;
833 SCM_DEFINE (scm_close_output_port
, "close-output-port", 1, 0, 0,
835 "Close the specified output port object. The routine has no effect if\n"
836 "the file has already been closed. An exception may be raised if an\n"
837 "error occurs. The value returned is unspecified.\n\n"
838 "See also @ref{Ports and File Descriptors, close}, for a procedure\n"
839 "which can close file descriptors.")
840 #define FUNC_NAME s_scm_close_output_port
842 port
= SCM_COERCE_OUTPORT (port
);
843 SCM_VALIDATE_OUTPUT_PORT (1, port
);
844 scm_close_port (port
);
845 return SCM_UNSPECIFIED
;
850 scm_i_collect_keys_in_vector (void *closure
, SCM key
, SCM value
, SCM result
)
852 int *i
= (int*) closure
;
853 scm_c_vector_set_x (result
, *i
, key
);
860 scm_c_port_for_each (void (*proc
)(void *data
, SCM p
), void *data
)
866 /* Even without pre-emptive multithreading, running arbitrary code
867 while scanning the port table is unsafe because the port table
868 can change arbitrarily (from a GC, for example). So we first
869 collect the ports into a vector. -mvo */
871 scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex
);
872 n
= SCM_HASHTABLE_N_ITEMS (scm_i_port_weak_hash
);
873 scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex
);
874 ports
= scm_c_make_vector (n
, SCM_BOOL_F
);
876 scm_i_pthread_mutex_lock (&scm_i_port_table_mutex
);
877 ports
= scm_internal_hash_fold (scm_i_collect_keys_in_vector
, &i
,
878 ports
, scm_i_port_weak_hash
);
879 scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex
);
881 for (i
= 0; i
< n
; i
++) {
882 SCM p
= SCM_SIMPLE_VECTOR_REF (ports
, i
);
887 scm_remember_upto_here_1 (ports
);
890 SCM_DEFINE (scm_port_for_each
, "port-for-each", 1, 0, 0,
892 "Apply @var{proc} to each port in the Guile port table\n"
893 "in turn. The return value is unspecified. More specifically,\n"
894 "@var{proc} is applied exactly once to every port that exists\n"
895 "in the system at the time @var{port-for-each} is invoked.\n"
896 "Changes to the port table while @var{port-for-each} is running\n"
897 "have no effect as far as @var{port-for-each} is concerned.")
898 #define FUNC_NAME s_scm_port_for_each
900 SCM_VALIDATE_PROC (1, proc
);
902 scm_c_port_for_each ((void (*)(void*,SCM
))scm_call_1
, proc
);
903 return SCM_UNSPECIFIED
;
909 /* Utter miscellany. Gosh, we should clean this up some time. */
911 SCM_DEFINE (scm_input_port_p
, "input-port?", 1, 0, 0,
913 "Return @code{#t} if @var{x} is an input port, otherwise return\n"
914 "@code{#f}. Any object satisfying this predicate also satisfies\n"
916 #define FUNC_NAME s_scm_input_port_p
918 return scm_from_bool (SCM_INPUT_PORT_P (x
));
922 SCM_DEFINE (scm_output_port_p
, "output-port?", 1, 0, 0,
924 "Return @code{#t} if @var{x} is an output port, otherwise return\n"
925 "@code{#f}. Any object satisfying this predicate also satisfies\n"
927 #define FUNC_NAME s_scm_output_port_p
929 x
= SCM_COERCE_OUTPORT (x
);
930 return scm_from_bool (SCM_OUTPUT_PORT_P (x
));
934 SCM_DEFINE (scm_port_p
, "port?", 1, 0, 0,
936 "Return a boolean indicating whether @var{x} is a port.\n"
937 "Equivalent to @code{(or (input-port? @var{x}) (output-port?\n"
939 #define FUNC_NAME s_scm_port_p
941 return scm_from_bool (SCM_PORTP (x
));
945 SCM_DEFINE (scm_port_closed_p
, "port-closed?", 1, 0, 0,
947 "Return @code{#t} if @var{port} is closed or @code{#f} if it is\n"
949 #define FUNC_NAME s_scm_port_closed_p
951 SCM_VALIDATE_PORT (1, port
);
952 return scm_from_bool (!SCM_OPPORTP (port
));
956 SCM_DEFINE (scm_eof_object_p
, "eof-object?", 1, 0, 0,
958 "Return @code{#t} if @var{x} is an end-of-file object; otherwise\n"
960 #define FUNC_NAME s_scm_eof_object_p
962 return scm_from_bool(SCM_EOF_OBJECT_P (x
));
966 SCM_DEFINE (scm_force_output
, "force-output", 0, 1, 0,
968 "Flush the specified output port, or the current output port if @var{port}\n"
969 "is omitted. The current output buffer contents are passed to the\n"
970 "underlying port implementation (e.g., in the case of fports, the\n"
971 "data will be written to the file and the output buffer will be cleared.)\n"
972 "It has no effect on an unbuffered port.\n\n"
973 "The return value is unspecified.")
974 #define FUNC_NAME s_scm_force_output
976 if (SCM_UNBNDP (port
))
977 port
= scm_current_output_port ();
980 port
= SCM_COERCE_OUTPORT (port
);
981 SCM_VALIDATE_OPOUTPORT (1, port
);
984 return SCM_UNSPECIFIED
;
990 flush_output_port (void *closure
, SCM port
)
992 if (SCM_OPOUTPORTP (port
))
996 SCM_DEFINE (scm_flush_all_ports
, "flush-all-ports", 0, 0, 0,
998 "Equivalent to calling @code{force-output} on\n"
999 "all open output ports. The return value is unspecified.")
1000 #define FUNC_NAME s_scm_flush_all_ports
1002 scm_c_port_for_each (&flush_output_port
, NULL
);
1003 return SCM_UNSPECIFIED
;
1007 SCM_DEFINE (scm_read_char
, "read-char", 0, 1, 0,
1009 "Return the next character available from @var{port}, updating\n"
1010 "@var{port} to point to the following character. If no more\n"
1011 "characters are available, the end-of-file object is returned.")
1012 #define FUNC_NAME s_scm_read_char
1015 if (SCM_UNBNDP (port
))
1016 port
= scm_current_input_port ();
1017 SCM_VALIDATE_OPINPORT (1, port
);
1018 c
= scm_getc (port
);
1021 return SCM_MAKE_CHAR (c
);
1025 #define SCM_MBCHAR_BUF_SIZE (4)
1027 /* Read a codepoint from PORT and return it. Fill BUF with the byte
1028 representation of the codepoint in PORT's encoding, and set *LEN to
1029 the length in bytes of that representation. Raise an error on
1032 get_codepoint (SCM port
, char buf
[SCM_MBCHAR_BUF_SIZE
], size_t *len
)
1035 size_t bufcount
= 0;
1036 scm_t_uint32 result_buf
;
1037 scm_t_wchar codepoint
= 0;
1040 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1042 c
= scm_get_byte_or_eof (port
);
1044 return (scm_t_wchar
) EOF
;
1049 if (pt
->encoding
== NULL
)
1051 /* The encoding is Latin-1: bytes are characters. */
1052 codepoint
= (unsigned char) buf
[0];
1058 u32len
= sizeof (result_buf
) / sizeof (scm_t_uint32
);
1059 u32
= u32_conv_from_encoding (pt
->encoding
,
1060 (enum iconv_ilseq_handler
) pt
->ilseq_handler
,
1061 buf
, bufcount
, NULL
, &result_buf
, &u32len
);
1062 if (u32
== NULL
|| u32len
== 0)
1064 if (errno
== ENOMEM
)
1065 scm_memory_error ("Input decoding");
1067 /* Otherwise errno is EILSEQ or EINVAL, so perhaps more
1068 bytes are needed. Keep looping. */
1072 /* Complete codepoint found. */
1075 if (SCM_UNLIKELY (u32
!= &result_buf
))
1076 /* libunistring up to 0.9.3 (included) would always heap-allocate
1077 the result even when a large-enough RESULT_BUF is supplied, see
1078 <http://lists.gnu.org/archive/html/bug-libunistring/2010-07/msg00003.html>. */
1084 if (bufcount
== SCM_MBCHAR_BUF_SIZE
)
1086 /* We've read several bytes and didn't find a good
1087 codepoint. Give up. */
1091 c
= scm_get_byte_or_eof (port
);
1095 /* EOF before a complete character was read. Push it all
1096 back and return EOF. */
1097 while (bufcount
> 0)
1099 /* FIXME: this will probably cause errors in the port column. */
1100 scm_unget_byte (buf
[bufcount
-1], port
);
1108 /* It is always invalid to have EOL in the middle of a
1109 multibyte character. */
1110 scm_unget_byte ('\n', port
);
1114 buf
[bufcount
++] = c
;
1146 SCM err_str
= scm_i_make_string (bufcount
, &err_buf
);
1147 memcpy (err_buf
, buf
, bufcount
);
1149 if (errno
== EILSEQ
)
1150 scm_misc_error (NULL
, "input encoding error for ~s: ~s",
1151 scm_list_2 (scm_from_locale_string (scm_i_get_port_encoding (port
)),
1154 scm_misc_error (NULL
, "input encoding error (invalid) for ~s: ~s\n",
1155 scm_list_2 (scm_from_locale_string (scm_i_get_port_encoding (port
)),
1159 /* Never gets here. */
1163 /* Read a codepoint from PORT and return it. */
1168 char buf
[SCM_MBCHAR_BUF_SIZE
];
1170 return get_codepoint (port
, buf
, &len
);
1173 /* this should only be called when the read buffer is empty. it
1174 tries to refill the read buffer. it returns the first char from
1175 the port, which is either EOF or *(pt->read_pos). */
1177 scm_fill_input (SCM port
)
1179 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1181 assert (pt
->read_pos
== pt
->read_end
);
1183 if (pt
->read_buf
== pt
->putback_buf
)
1185 /* finished reading put-back chars. */
1186 pt
->read_buf
= pt
->saved_read_buf
;
1187 pt
->read_pos
= pt
->saved_read_pos
;
1188 pt
->read_end
= pt
->saved_read_end
;
1189 pt
->read_buf_size
= pt
->saved_read_buf_size
;
1190 if (pt
->read_pos
< pt
->read_end
)
1191 return *(pt
->read_pos
);
1193 return scm_ptobs
[SCM_PTOBNUM (port
)].fill_input (port
);
1199 * This function differs from scm_c_write; it updates port line and
1203 update_port_lf (scm_t_wchar c
, SCM port
)
1220 scm_lfwrite (const char *ptr
, size_t size
, SCM port
)
1222 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1223 scm_t_ptob_descriptor
*ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
1225 if (pt
->rw_active
== SCM_PORT_READ
)
1226 scm_end_input (port
);
1228 ptob
->write (port
, ptr
, size
);
1230 for (; size
; ptr
++, size
--)
1231 update_port_lf ((scm_t_wchar
) (unsigned char) *ptr
, port
);
1234 pt
->rw_active
= SCM_PORT_WRITE
;
1237 /* Write a scheme string STR to PORT from START inclusive to END
1240 scm_lfwrite_substr (SCM str
, size_t start
, size_t end
, SCM port
)
1242 size_t i
, size
= scm_i_string_length (str
);
1243 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1244 scm_t_ptob_descriptor
*ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
1249 if (pt
->rw_active
== SCM_PORT_READ
)
1250 scm_end_input (port
);
1252 if (end
== (size_t) (-1))
1256 /* Note that making a substring will likely take the
1257 stringbuf_write_mutex. So, one shouldn't use scm_lfwrite_substr
1258 if the stringbuf write mutex may still be held elsewhere. */
1259 buf
= scm_to_stringn (scm_c_substring (str
, start
, end
), &len
,
1260 pt
->encoding
, pt
->ilseq_handler
);
1261 ptob
->write (port
, buf
, len
);
1264 for (i
= 0; i
< size
; i
++)
1266 p
= scm_i_string_ref (str
, i
+ start
);
1267 update_port_lf (p
, port
);
1271 pt
->rw_active
= SCM_PORT_WRITE
;
1274 /* Write a scheme string STR to PORT. */
1276 scm_lfwrite_str (SCM str
, SCM port
)
1278 size_t i
, size
= scm_i_string_length (str
);
1279 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1280 scm_t_ptob_descriptor
*ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
1285 if (pt
->rw_active
== SCM_PORT_READ
)
1286 scm_end_input (port
);
1288 buf
= scm_to_stringn (str
, &len
,
1289 pt
->encoding
, pt
->ilseq_handler
);
1290 ptob
->write (port
, buf
, len
);
1293 for (i
= 0; i
< size
; i
++)
1295 p
= scm_i_string_ref (str
, i
);
1296 update_port_lf (p
, port
);
1300 pt
->rw_active
= SCM_PORT_WRITE
;
1305 * Used by an application to read arbitrary number of bytes from an
1306 * SCM port. Same semantics as libc read, except that scm_c_read only
1307 * returns less than SIZE bytes if at end-of-file.
1309 * Warning: Doesn't update port line and column counts! */
1311 /* This structure, and the following swap_buffer function, are used
1312 for temporarily swapping a port's own read buffer, and the buffer
1313 that the caller of scm_c_read provides. */
1314 struct port_and_swap_buffer
1317 unsigned char *buffer
;
1322 swap_buffer (void *data
)
1324 struct port_and_swap_buffer
*psb
= (struct port_and_swap_buffer
*) data
;
1325 unsigned char *old_buf
= psb
->pt
->read_buf
;
1326 size_t old_size
= psb
->pt
->read_buf_size
;
1328 /* Make the port use (buffer, size) from the struct. */
1329 psb
->pt
->read_pos
= psb
->pt
->read_buf
= psb
->pt
->read_end
= psb
->buffer
;
1330 psb
->pt
->read_buf_size
= psb
->size
;
1332 /* Save the port's old (buffer, size) in the struct. */
1333 psb
->buffer
= old_buf
;
1334 psb
->size
= old_size
;
1338 scm_c_read (SCM port
, void *buffer
, size_t size
)
1339 #define FUNC_NAME "scm_c_read"
1342 size_t n_read
= 0, n_available
;
1343 struct port_and_swap_buffer psb
;
1345 SCM_VALIDATE_OPINPORT (1, port
);
1347 pt
= SCM_PTAB_ENTRY (port
);
1348 if (pt
->rw_active
== SCM_PORT_WRITE
)
1349 scm_ptobs
[SCM_PTOBNUM (port
)].flush (port
);
1352 pt
->rw_active
= SCM_PORT_READ
;
1354 /* Take bytes first from the port's read buffer. */
1355 if (pt
->read_pos
< pt
->read_end
)
1357 n_available
= min (size
, pt
->read_end
- pt
->read_pos
);
1358 memcpy (buffer
, pt
->read_pos
, n_available
);
1359 buffer
= (char *) buffer
+ n_available
;
1360 pt
->read_pos
+= n_available
;
1361 n_read
+= n_available
;
1362 size
-= n_available
;
1365 /* Avoid the scm_dynwind_* costs if we now have enough data. */
1369 /* Now we will call scm_fill_input repeatedly until we have read the
1370 requested number of bytes. (Note that a single scm_fill_input
1371 call does not guarantee to fill the whole of the port's read
1373 if (pt
->read_buf_size
<= 1 && pt
->encoding
== NULL
)
1375 /* The port that we are reading from is unbuffered - i.e. does
1376 not have its own persistent buffer - but we have a buffer,
1377 provided by our caller, that is the right size for the data
1378 that is wanted. For the following scm_fill_input calls,
1379 therefore, we use the buffer in hand as the port's read
1382 We need to make sure that the port's normal (1 byte) buffer
1383 is reinstated in case one of the scm_fill_input () calls
1384 throws an exception; we use the scm_dynwind_* API to achieve
1387 A consequence of this optimization is that the fill_input
1388 functions can't unget characters. That'll push data to the
1389 pushback buffer instead of this psb buffer. */
1391 unsigned char *pback
= pt
->putback_buf
;
1394 psb
.buffer
= buffer
;
1396 scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE
);
1397 scm_dynwind_rewind_handler (swap_buffer
, &psb
, SCM_F_WIND_EXPLICITLY
);
1398 scm_dynwind_unwind_handler (swap_buffer
, &psb
, SCM_F_WIND_EXPLICITLY
);
1400 /* Call scm_fill_input until we have all the bytes that we need,
1402 while (pt
->read_buf_size
&& (scm_fill_input (port
) != EOF
))
1404 pt
->read_buf_size
-= (pt
->read_end
- pt
->read_pos
);
1405 pt
->read_pos
= pt
->read_buf
= pt
->read_end
;
1408 if (pback
!= pt
->putback_buf
1409 || pt
->read_buf
- (unsigned char *) buffer
< 0)
1410 scm_misc_error (FUNC_NAME
,
1411 "scm_c_read must not call a fill function that pushes "
1412 "back characters onto an unbuffered port", SCM_EOL
);
1414 n_read
+= pt
->read_buf
- (unsigned char *) buffer
;
1416 /* Reinstate the port's normal buffer. */
1421 /* The port has its own buffer. It is important that we use it,
1422 even if it happens to be smaller than our caller's buffer, so
1423 that a custom port implementation's entry points (in
1424 particular, fill_input) can rely on the buffer always being
1425 the same as they first set up. */
1426 while (size
&& (scm_fill_input (port
) != EOF
))
1428 n_available
= min (size
, pt
->read_end
- pt
->read_pos
);
1429 memcpy (buffer
, pt
->read_pos
, n_available
);
1430 buffer
= (char *) buffer
+ n_available
;
1431 pt
->read_pos
+= n_available
;
1432 n_read
+= n_available
;
1433 size
-= n_available
;
1443 * Used by an application to write arbitrary number of bytes to an SCM
1444 * port. Similar semantics as libc write. However, unlike libc
1445 * write, scm_c_write writes the requested number of bytes and has no
1448 * Warning: Doesn't update port line and column counts!
1452 scm_c_write (SCM port
, const void *ptr
, size_t size
)
1453 #define FUNC_NAME "scm_c_write"
1456 scm_t_ptob_descriptor
*ptob
;
1458 SCM_VALIDATE_OPOUTPORT (1, port
);
1460 pt
= SCM_PTAB_ENTRY (port
);
1461 ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
1463 if (pt
->rw_active
== SCM_PORT_READ
)
1464 scm_end_input (port
);
1466 ptob
->write (port
, ptr
, size
);
1469 pt
->rw_active
= SCM_PORT_WRITE
;
1474 scm_flush (SCM port
)
1476 long i
= SCM_PTOBNUM (port
);
1478 (scm_ptobs
[i
].flush
) (port
);
1482 scm_end_input (SCM port
)
1485 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1487 if (pt
->read_buf
== pt
->putback_buf
)
1489 offset
= pt
->read_end
- pt
->read_pos
;
1490 pt
->read_buf
= pt
->saved_read_buf
;
1491 pt
->read_pos
= pt
->saved_read_pos
;
1492 pt
->read_end
= pt
->saved_read_end
;
1493 pt
->read_buf_size
= pt
->saved_read_buf_size
;
1498 scm_ptobs
[SCM_PTOBNUM (port
)].end_input (port
, offset
);
1505 scm_unget_byte (int c
, SCM port
)
1506 #define FUNC_NAME "scm_unget_byte"
1508 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1510 if (pt
->read_buf
== pt
->putback_buf
)
1511 /* already using the put-back buffer. */
1513 /* enlarge putback_buf if necessary. */
1514 if (pt
->read_end
== pt
->read_buf
+ pt
->read_buf_size
1515 && pt
->read_buf
== pt
->read_pos
)
1517 size_t new_size
= pt
->read_buf_size
* 2;
1518 unsigned char *tmp
= (unsigned char *)
1519 scm_gc_realloc (pt
->putback_buf
, pt
->read_buf_size
, new_size
,
1522 pt
->read_pos
= pt
->read_buf
= pt
->putback_buf
= tmp
;
1523 pt
->read_end
= pt
->read_buf
+ pt
->read_buf_size
;
1524 pt
->read_buf_size
= pt
->putback_buf_size
= new_size
;
1527 /* shift any existing bytes to buffer + 1. */
1528 if (pt
->read_pos
== pt
->read_end
)
1529 pt
->read_end
= pt
->read_buf
+ 1;
1530 else if (pt
->read_pos
!= pt
->read_buf
+ 1)
1532 int count
= pt
->read_end
- pt
->read_pos
;
1534 memmove (pt
->read_buf
+ 1, pt
->read_pos
, count
);
1535 pt
->read_end
= pt
->read_buf
+ 1 + count
;
1538 pt
->read_pos
= pt
->read_buf
;
1541 /* switch to the put-back buffer. */
1543 if (pt
->putback_buf
== NULL
)
1546 = (unsigned char *) scm_gc_malloc_pointerless
1547 (SCM_INITIAL_PUTBACK_BUF_SIZE
, "putback buffer");
1548 pt
->putback_buf_size
= SCM_INITIAL_PUTBACK_BUF_SIZE
;
1551 pt
->saved_read_buf
= pt
->read_buf
;
1552 pt
->saved_read_pos
= pt
->read_pos
;
1553 pt
->saved_read_end
= pt
->read_end
;
1554 pt
->saved_read_buf_size
= pt
->read_buf_size
;
1556 pt
->read_pos
= pt
->read_buf
= pt
->putback_buf
;
1557 pt
->read_end
= pt
->read_buf
+ 1;
1558 pt
->read_buf_size
= pt
->putback_buf_size
;
1564 pt
->rw_active
= SCM_PORT_READ
;
1569 scm_ungetc (scm_t_wchar c
, SCM port
)
1570 #define FUNC_NAME "scm_ungetc"
1572 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1574 char result_buf
[10];
1575 const char *encoding
;
1579 if (pt
->encoding
!= NULL
)
1580 encoding
= pt
->encoding
;
1582 encoding
= "ISO-8859-1";
1584 len
= sizeof (result_buf
);
1585 result
= u32_conv_to_encoding (encoding
,
1586 (enum iconv_ilseq_handler
) pt
->ilseq_handler
,
1587 (uint32_t *) &c
, 1, NULL
,
1590 if (SCM_UNLIKELY (result
== NULL
|| len
== 0))
1594 chr
= scm_integer_to_char (scm_from_uint32 (c
));
1595 scm_encoding_error (FUNC_NAME
, errno
,
1596 "conversion to port encoding failed",
1598 scm_string (scm_list_1 (chr
)));
1601 for (i
= len
- 1; i
>= 0; i
--)
1602 scm_unget_byte (result
[i
], port
);
1604 if (SCM_UNLIKELY (result
!= result_buf
))
1609 /* What should col be in this case?
1610 * We'll leave it at -1.
1612 SCM_LINUM (port
) -= 1;
1621 scm_ungets (const char *s
, int n
, SCM port
)
1623 /* This is simple minded and inefficient, but unreading strings is
1624 * probably not a common operation, and remember that line and
1625 * column numbers have to be handled...
1627 * Please feel free to write an optimized version!
1630 scm_ungetc (s
[n
], port
);
1634 SCM_DEFINE (scm_peek_char
, "peek-char", 0, 1, 0,
1636 "Return the next character available from @var{port},\n"
1637 "@emph{without} updating @var{port} to point to the following\n"
1638 "character. If no more characters are available, the\n"
1639 "end-of-file object is returned.\n"
1641 "The value returned by\n"
1642 "a call to @code{peek-char} is the same as the value that would\n"
1643 "have been returned by a call to @code{read-char} on the same\n"
1644 "port. The only difference is that the very next call to\n"
1645 "@code{read-char} or @code{peek-char} on that @var{port} will\n"
1646 "return the value returned by the preceding call to\n"
1647 "@code{peek-char}. In particular, a call to @code{peek-char} on\n"
1648 "an interactive port will hang waiting for input whenever a call\n"
1649 "to @code{read-char} would have hung.")
1650 #define FUNC_NAME s_scm_peek_char
1654 char bytes
[SCM_MBCHAR_BUF_SIZE
];
1658 if (SCM_UNBNDP (port
))
1659 port
= scm_current_input_port ();
1660 SCM_VALIDATE_OPINPORT (1, port
);
1662 column
= SCM_COL (port
);
1663 line
= SCM_LINUM (port
);
1665 c
= get_codepoint (port
, bytes
, &len
);
1667 result
= SCM_EOF_VAL
;
1672 result
= SCM_MAKE_CHAR (c
);
1674 for (i
= len
- 1; i
>= 0; i
--)
1675 scm_unget_byte (bytes
[i
], port
);
1677 SCM_COL (port
) = column
;
1678 SCM_LINUM (port
) = line
;
1685 SCM_DEFINE (scm_unread_char
, "unread-char", 1, 1, 0,
1686 (SCM cobj
, SCM port
),
1687 "Place @var{char} in @var{port} so that it will be read by the\n"
1688 "next read operation. If called multiple times, the unread characters\n"
1689 "will be read again in last-in first-out order. If @var{port} is\n"
1690 "not supplied, the current input port is used.")
1691 #define FUNC_NAME s_scm_unread_char
1695 SCM_VALIDATE_CHAR (1, cobj
);
1696 if (SCM_UNBNDP (port
))
1697 port
= scm_current_input_port ();
1698 SCM_VALIDATE_OPINPORT (2, port
);
1700 c
= SCM_CHAR (cobj
);
1702 scm_ungetc (c
, port
);
1707 SCM_DEFINE (scm_unread_string
, "unread-string", 2, 0, 0,
1708 (SCM str
, SCM port
),
1709 "Place the string @var{str} in @var{port} so that its characters will be\n"
1710 "read in subsequent read operations. If called multiple times, the\n"
1711 "unread characters will be read again in last-in first-out order. If\n"
1712 "@var{port} is not supplied, the current-input-port is used.")
1713 #define FUNC_NAME s_scm_unread_string
1716 SCM_VALIDATE_STRING (1, str
);
1717 if (SCM_UNBNDP (port
))
1718 port
= scm_current_input_port ();
1719 SCM_VALIDATE_OPINPORT (2, port
);
1721 n
= scm_i_string_length (str
);
1724 scm_ungetc (scm_i_string_ref (str
, n
), port
);
1730 SCM_DEFINE (scm_seek
, "seek", 3, 0, 0,
1731 (SCM fd_port
, SCM offset
, SCM whence
),
1732 "Sets the current position of @var{fd/port} to the integer\n"
1733 "@var{offset}, which is interpreted according to the value of\n"
1736 "One of the following variables should be supplied for\n"
1738 "@defvar SEEK_SET\n"
1739 "Seek from the beginning of the file.\n"
1741 "@defvar SEEK_CUR\n"
1742 "Seek from the current position.\n"
1744 "@defvar SEEK_END\n"
1745 "Seek from the end of the file.\n"
1747 "If @var{fd/port} is a file descriptor, the underlying system\n"
1748 "call is @code{lseek}. @var{port} may be a string port.\n"
1750 "The value returned is the new position in the file. This means\n"
1751 "that the current position of a port can be obtained using:\n"
1753 "(seek port 0 SEEK_CUR)\n"
1755 #define FUNC_NAME s_scm_seek
1759 fd_port
= SCM_COERCE_OUTPORT (fd_port
);
1761 how
= scm_to_int (whence
);
1762 if (how
!= SEEK_SET
&& how
!= SEEK_CUR
&& how
!= SEEK_END
)
1763 SCM_OUT_OF_RANGE (3, whence
);
1765 if (SCM_OPPORTP (fd_port
))
1767 scm_t_ptob_descriptor
*ptob
= scm_ptobs
+ SCM_PTOBNUM (fd_port
);
1768 off_t_or_off64_t off
= scm_to_off_t_or_off64_t (offset
);
1769 off_t_or_off64_t rv
;
1772 SCM_MISC_ERROR ("port is not seekable",
1773 scm_cons (fd_port
, SCM_EOL
));
1775 rv
= ptob
->seek (fd_port
, off
, how
);
1776 return scm_from_off_t_or_off64_t (rv
);
1778 else /* file descriptor?. */
1780 off_t_or_off64_t off
= scm_to_off_t_or_off64_t (offset
);
1781 off_t_or_off64_t rv
;
1782 rv
= lseek_or_lseek64 (scm_to_int (fd_port
), off
, how
);
1785 return scm_from_off_t_or_off64_t (rv
);
1794 /* Mingw has ftruncate(), perhaps implemented above using chsize, but
1795 doesn't have the filename version truncate(), hence this code. */
1796 #if HAVE_FTRUNCATE && ! HAVE_TRUNCATE
1798 truncate (const char *file
, off_t length
)
1802 fdes
= open (file
, O_BINARY
| O_WRONLY
);
1806 ret
= ftruncate (fdes
, length
);
1809 int save_errno
= errno
;
1815 return close (fdes
);
1817 #endif /* HAVE_FTRUNCATE && ! HAVE_TRUNCATE */
1819 SCM_DEFINE (scm_truncate_file
, "truncate-file", 1, 1, 0,
1820 (SCM object
, SCM length
),
1821 "Truncate @var{file} to @var{length} bytes. @var{file} can be a\n"
1822 "filename string, a port object, or an integer file descriptor.\n"
1823 "The return value is unspecified.\n"
1825 "For a port or file descriptor @var{length} can be omitted, in\n"
1826 "which case the file is truncated at the current position (per\n"
1827 "@code{ftell} above).\n"
1829 "On most systems a file can be extended by giving a length\n"
1830 "greater than the current size, but this is not mandatory in the\n"
1832 #define FUNC_NAME s_scm_truncate_file
1836 /* "object" can be a port, fdes or filename.
1838 Negative "length" makes no sense, but it's left to truncate() or
1839 ftruncate() to give back an error for that (normally EINVAL).
1842 if (SCM_UNBNDP (length
))
1844 /* must supply length if object is a filename. */
1845 if (scm_is_string (object
))
1846 SCM_MISC_ERROR("must supply length if OBJECT is a filename", SCM_EOL
);
1848 length
= scm_seek (object
, SCM_INUM0
, scm_from_int (SEEK_CUR
));
1851 object
= SCM_COERCE_OUTPORT (object
);
1852 if (scm_is_integer (object
))
1854 off_t_or_off64_t c_length
= scm_to_off_t_or_off64_t (length
);
1855 SCM_SYSCALL (rv
= ftruncate_or_ftruncate64 (scm_to_int (object
),
1858 else if (SCM_OPOUTPORTP (object
))
1860 off_t_or_off64_t c_length
= scm_to_off_t_or_off64_t (length
);
1861 scm_t_port
*pt
= SCM_PTAB_ENTRY (object
);
1862 scm_t_ptob_descriptor
*ptob
= scm_ptobs
+ SCM_PTOBNUM (object
);
1864 if (!ptob
->truncate
)
1865 SCM_MISC_ERROR ("port is not truncatable", SCM_EOL
);
1866 if (pt
->rw_active
== SCM_PORT_READ
)
1867 scm_end_input (object
);
1868 else if (pt
->rw_active
== SCM_PORT_WRITE
)
1869 ptob
->flush (object
);
1871 ptob
->truncate (object
, c_length
);
1876 off_t_or_off64_t c_length
= scm_to_off_t_or_off64_t (length
);
1877 char *str
= scm_to_locale_string (object
);
1879 SCM_SYSCALL (rv
= truncate_or_truncate64 (str
, c_length
));
1886 return SCM_UNSPECIFIED
;
1890 SCM_DEFINE (scm_port_line
, "port-line", 1, 0, 0,
1892 "Return the current line number for @var{port}.\n"
1894 "The first line of a file is 0. But you might want to add 1\n"
1895 "when printing line numbers, since starting from 1 is\n"
1896 "traditional in error messages, and likely to be more natural to\n"
1898 #define FUNC_NAME s_scm_port_line
1900 port
= SCM_COERCE_OUTPORT (port
);
1901 SCM_VALIDATE_OPENPORT (1, port
);
1902 return scm_from_long (SCM_LINUM (port
));
1906 SCM_DEFINE (scm_set_port_line_x
, "set-port-line!", 2, 0, 0,
1907 (SCM port
, SCM line
),
1908 "Set the current line number for @var{port} to @var{line}. The\n"
1909 "first line of a file is 0.")
1910 #define FUNC_NAME s_scm_set_port_line_x
1912 port
= SCM_COERCE_OUTPORT (port
);
1913 SCM_VALIDATE_OPENPORT (1, port
);
1914 SCM_PTAB_ENTRY (port
)->line_number
= scm_to_long (line
);
1915 return SCM_UNSPECIFIED
;
1919 SCM_DEFINE (scm_port_column
, "port-column", 1, 0, 0,
1921 "Return the current column number of @var{port}.\n"
1922 "If the number is\n"
1923 "unknown, the result is #f. Otherwise, the result is a 0-origin integer\n"
1924 "- i.e. the first character of the first line is line 0, column 0.\n"
1925 "(However, when you display a file position, for example in an error\n"
1926 "message, we recommend you add 1 to get 1-origin integers. This is\n"
1927 "because lines and column numbers traditionally start with 1, and that is\n"
1928 "what non-programmers will find most natural.)")
1929 #define FUNC_NAME s_scm_port_column
1931 port
= SCM_COERCE_OUTPORT (port
);
1932 SCM_VALIDATE_OPENPORT (1, port
);
1933 return scm_from_int (SCM_COL (port
));
1937 SCM_DEFINE (scm_set_port_column_x
, "set-port-column!", 2, 0, 0,
1938 (SCM port
, SCM column
),
1939 "Set the current column of @var{port}. Before reading the first\n"
1940 "character on a line the column should be 0.")
1941 #define FUNC_NAME s_scm_set_port_column_x
1943 port
= SCM_COERCE_OUTPORT (port
);
1944 SCM_VALIDATE_OPENPORT (1, port
);
1945 SCM_PTAB_ENTRY (port
)->column_number
= scm_to_int (column
);
1946 return SCM_UNSPECIFIED
;
1950 SCM_DEFINE (scm_port_filename
, "port-filename", 1, 0, 0,
1952 "Return the filename associated with @var{port}. This function returns\n"
1953 "the strings \"standard input\", \"standard output\" and \"standard error\"\n"
1954 "when called on the current input, output and error ports respectively.")
1955 #define FUNC_NAME s_scm_port_filename
1957 port
= SCM_COERCE_OUTPORT (port
);
1958 SCM_VALIDATE_OPENPORT (1, port
);
1959 return SCM_FILENAME (port
);
1963 SCM_DEFINE (scm_set_port_filename_x
, "set-port-filename!", 2, 0, 0,
1964 (SCM port
, SCM filename
),
1965 "Change the filename associated with @var{port}, using the current input\n"
1966 "port if none is specified. Note that this does not change the port's\n"
1967 "source of data, but only the value that is returned by\n"
1968 "@code{port-filename} and reported in diagnostic output.")
1969 #define FUNC_NAME s_scm_set_port_filename_x
1971 port
= SCM_COERCE_OUTPORT (port
);
1972 SCM_VALIDATE_OPENPORT (1, port
);
1973 /* We allow the user to set the filename to whatever he likes. */
1974 SCM_SET_FILENAME (port
, filename
);
1975 return SCM_UNSPECIFIED
;
1979 /* A fluid specifying the default encoding for newly created ports. If it is
1980 a string, that is the encoding. If it is #f, it is in the "native"
1981 (Latin-1) encoding. */
1982 SCM_VARIABLE (default_port_encoding_var
, "%default-port-encoding");
1984 static int scm_port_encoding_init
= 0;
1986 /* Return a C string representation of the current encoding. */
1988 scm_i_get_port_encoding (SCM port
)
1992 if (scm_is_false (port
))
1994 if (!scm_port_encoding_init
)
1996 else if (!scm_is_fluid (SCM_VARIABLE_REF (default_port_encoding_var
)))
2000 encoding
= scm_fluid_ref (SCM_VARIABLE_REF (default_port_encoding_var
));
2001 if (!scm_is_string (encoding
))
2004 return scm_i_string_chars (encoding
);
2010 pt
= SCM_PTAB_ENTRY (port
);
2012 return pt
->encoding
;
2018 /* Returns ENC if it is a recognized encoding. If it isn't, it tries
2019 to find an alias of ENC that is valid. Otherwise, it returns
2022 find_valid_encoding (const char *enc
)
2025 const char str
[] = " ";
2026 scm_t_uint32 result_buf
;
2030 u32len
= sizeof (result_buf
) / sizeof (scm_t_uint32
);
2031 u32
= u32_conv_from_encoding (enc
, iconveh_error
, str
, 1,
2032 NULL
, &result_buf
, &u32len
);
2033 isvalid
= (u32
!= NULL
);
2035 if (SCM_UNLIKELY (u32
!= &result_buf
))
2045 scm_i_set_port_encoding_x (SCM port
, const char *enc
)
2047 const char *valid_enc
;
2050 /* Null is shorthand for the native, Latin-1 encoding. */
2055 valid_enc
= find_valid_encoding (enc
);
2056 if (valid_enc
== NULL
)
2059 err
= scm_from_locale_string (enc
);
2060 scm_misc_error (NULL
, "invalid or unknown character encoding ~s",
2065 if (scm_is_false (port
))
2067 /* Set the default encoding for future ports. */
2068 if (!scm_port_encoding_init
2069 || !scm_is_fluid (SCM_VARIABLE_REF (default_port_encoding_var
)))
2070 scm_misc_error (NULL
, "tried to set port encoding fluid before it is initialized",
2073 if (valid_enc
== NULL
2074 || !strcmp (valid_enc
, "ASCII")
2075 || !strcmp (valid_enc
, "ANSI_X3.4-1968")
2076 || !strcmp (valid_enc
, "ISO-8859-1"))
2077 scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var
), SCM_BOOL_F
);
2079 scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var
),
2080 scm_from_locale_string (valid_enc
));
2084 /* Set the character encoding for this port. */
2085 pt
= SCM_PTAB_ENTRY (port
);
2086 if (valid_enc
== NULL
)
2087 pt
->encoding
= NULL
;
2089 pt
->encoding
= scm_gc_strdup (valid_enc
, "port");
2093 SCM_DEFINE (scm_port_encoding
, "port-encoding", 1, 0, 0,
2095 "Returns, as a string, the character encoding that @var{port}\n"
2096 "uses to interpret its input and output.\n")
2097 #define FUNC_NAME s_scm_port_encoding
2102 SCM_VALIDATE_PORT (1, port
);
2104 pt
= SCM_PTAB_ENTRY (port
);
2105 enc
= scm_i_get_port_encoding (port
);
2107 return scm_from_locale_string (pt
->encoding
);
2113 SCM_DEFINE (scm_set_port_encoding_x
, "set-port-encoding!", 2, 0, 0,
2114 (SCM port
, SCM enc
),
2115 "Sets the character encoding that will be used to interpret all\n"
2116 "port I/O. New ports are created with the encoding\n"
2117 "appropriate for the current locale if @code{setlocale} has \n"
2118 "been called or ISO-8859-1 otherwise\n"
2119 "and this procedure can be used to modify that encoding.\n")
2120 #define FUNC_NAME s_scm_set_port_encoding_x
2123 const char *valid_enc_str
;
2125 SCM_VALIDATE_PORT (1, port
);
2126 SCM_VALIDATE_STRING (2, enc
);
2128 enc_str
= scm_to_locale_string (enc
);
2129 valid_enc_str
= find_valid_encoding (enc_str
);
2130 if (valid_enc_str
== NULL
)
2133 scm_misc_error (FUNC_NAME
, "invalid or unknown character encoding ~s",
2138 scm_i_set_port_encoding_x (port
, valid_enc_str
);
2141 return SCM_UNSPECIFIED
;
2146 /* This determines how conversions handle unconvertible characters. */
2147 SCM_GLOBAL_VARIABLE (scm_conversion_strategy
, "%port-conversion-strategy");
2148 static int scm_conversion_strategy_init
= 0;
2150 scm_t_string_failed_conversion_handler
2151 scm_i_get_conversion_strategy (SCM port
)
2155 if (scm_is_false (port
))
2157 if (!scm_conversion_strategy_init
2158 || !scm_is_fluid (SCM_VARIABLE_REF (scm_conversion_strategy
)))
2159 return SCM_FAILED_CONVERSION_QUESTION_MARK
;
2162 encoding
= scm_fluid_ref (SCM_VARIABLE_REF (scm_conversion_strategy
));
2163 if (scm_is_false (encoding
))
2164 return SCM_FAILED_CONVERSION_QUESTION_MARK
;
2166 return (scm_t_string_failed_conversion_handler
) scm_to_int (encoding
);
2172 pt
= SCM_PTAB_ENTRY (port
);
2173 return pt
->ilseq_handler
;
2179 scm_i_set_conversion_strategy_x (SCM port
,
2180 scm_t_string_failed_conversion_handler handler
)
2185 strategy
= scm_from_int ((int) handler
);
2187 if (scm_is_false (port
))
2189 /* Set the default encoding for future ports. */
2190 if (!scm_conversion_strategy
2191 || !scm_is_fluid (SCM_VARIABLE_REF (scm_conversion_strategy
)))
2192 scm_misc_error (NULL
, "tried to set conversion strategy fluid before it is initialized",
2194 scm_fluid_set_x (SCM_VARIABLE_REF (scm_conversion_strategy
), strategy
);
2198 /* Set the character encoding for this port. */
2199 pt
= SCM_PTAB_ENTRY (port
);
2200 pt
->ilseq_handler
= handler
;
2204 SCM_DEFINE (scm_port_conversion_strategy
, "port-conversion-strategy",
2205 1, 0, 0, (SCM port
),
2206 "Returns the behavior of the port when handling a character that\n"
2207 "is not representable in the port's current encoding.\n"
2208 "It returns the symbol @code{error} if unrepresentable characters\n"
2209 "should cause exceptions, @code{substitute} if the port should\n"
2210 "try to replace unrepresentable characters with question marks or\n"
2211 "approximate characters, or @code{escape} if unrepresentable\n"
2212 "characters should be converted to string escapes.\n"
2214 "If @var{port} is @code{#f}, then the current default behavior\n"
2215 "will be returned. New ports will have this default behavior\n"
2216 "when they are created.\n")
2217 #define FUNC_NAME s_scm_port_conversion_strategy
2219 scm_t_string_failed_conversion_handler h
;
2221 SCM_VALIDATE_OPPORT (1, port
);
2223 if (!scm_is_false (port
))
2225 SCM_VALIDATE_OPPORT (1, port
);
2228 h
= scm_i_get_conversion_strategy (port
);
2229 if (h
== SCM_FAILED_CONVERSION_ERROR
)
2230 return scm_from_locale_symbol ("error");
2231 else if (h
== SCM_FAILED_CONVERSION_QUESTION_MARK
)
2232 return scm_from_locale_symbol ("substitute");
2233 else if (h
== SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE
)
2234 return scm_from_locale_symbol ("escape");
2238 /* Never gets here. */
2239 return SCM_UNDEFINED
;
2243 SCM_DEFINE (scm_set_port_conversion_strategy_x
, "set-port-conversion-strategy!",
2245 (SCM port
, SCM sym
),
2246 "Sets the behavior of the interpreter when outputting a character\n"
2247 "that is not representable in the port's current encoding.\n"
2248 "@var{sym} can be either @code{'error}, @code{'substitute}, or\n"
2249 "@code{'escape}. If it is @code{'error}, an error will be thrown\n"
2250 "when an unconvertible character is encountered. If it is\n"
2251 "@code{'substitute}, then unconvertible characters will \n"
2252 "be replaced with approximate characters, or with question marks\n"
2253 "if no approximately correct character is available.\n"
2254 "If it is @code{'escape},\n"
2255 "it will appear as a hex escape when output.\n"
2257 "If @var{port} is an open port, the conversion error behavior\n"
2258 "is set for that port. If it is @code{#f}, it is set as the\n"
2259 "default behavior for any future ports that get created in\n"
2261 #define FUNC_NAME s_scm_set_port_conversion_strategy_x
2267 if (!scm_is_false (port
))
2269 SCM_VALIDATE_OPPORT (1, port
);
2272 err
= scm_from_locale_symbol ("error");
2273 if (scm_is_true (scm_eqv_p (sym
, err
)))
2275 scm_i_set_conversion_strategy_x (port
, SCM_FAILED_CONVERSION_ERROR
);
2276 return SCM_UNSPECIFIED
;
2279 qm
= scm_from_locale_symbol ("substitute");
2280 if (scm_is_true (scm_eqv_p (sym
, qm
)))
2282 scm_i_set_conversion_strategy_x (port
,
2283 SCM_FAILED_CONVERSION_QUESTION_MARK
);
2284 return SCM_UNSPECIFIED
;
2287 esc
= scm_from_locale_symbol ("escape");
2288 if (scm_is_true (scm_eqv_p (sym
, esc
)))
2290 scm_i_set_conversion_strategy_x (port
,
2291 SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE
);
2292 return SCM_UNSPECIFIED
;
2295 SCM_MISC_ERROR ("unknown conversion behavior ~s", scm_list_1 (sym
));
2297 return SCM_UNSPECIFIED
;
2304 scm_print_port_mode (SCM exp
, SCM port
)
2306 scm_puts (SCM_CLOSEDP (exp
)
2308 : (SCM_RDNG
& SCM_CELL_WORD_0 (exp
)
2309 ? (SCM_WRTNG
& SCM_CELL_WORD_0 (exp
)
2312 : (SCM_WRTNG
& SCM_CELL_WORD_0 (exp
)
2319 scm_port_print (SCM exp
, SCM port
, scm_print_state
*pstate SCM_UNUSED
)
2321 char *type
= SCM_PTOBNAME (SCM_PTOBNUM (exp
));
2324 scm_puts ("#<", port
);
2325 scm_print_port_mode (exp
, port
);
2326 scm_puts (type
, port
);
2327 scm_putc (' ', port
);
2328 scm_uintprint (SCM_CELL_WORD_1 (exp
), 16, port
);
2329 scm_putc ('>', port
);
2337 scm_t_bits scm_tc16_void_port
= 0;
2339 static int fill_input_void_port (SCM port SCM_UNUSED
)
2345 write_void_port (SCM port SCM_UNUSED
,
2346 const void *data SCM_UNUSED
,
2347 size_t size SCM_UNUSED
)
2352 scm_i_void_port (long mode_bits
)
2354 scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex
);
2356 SCM answer
= scm_new_port_table_entry (scm_tc16_void_port
);
2357 scm_t_port
* pt
= SCM_PTAB_ENTRY(answer
);
2359 scm_port_non_buffer (pt
);
2361 SCM_SETSTREAM (answer
, 0);
2362 SCM_SET_CELL_TYPE (answer
, scm_tc16_void_port
| mode_bits
);
2363 scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex
);
2369 scm_void_port (char *mode_str
)
2371 return scm_i_void_port (scm_mode_bits (mode_str
));
2374 SCM_DEFINE (scm_sys_make_void_port
, "%make-void-port", 1, 0, 0,
2376 "Create and return a new void port. A void port acts like\n"
2377 "@file{/dev/null}. The @var{mode} argument\n"
2378 "specifies the input/output modes for this port: see the\n"
2379 "documentation for @code{open-file} in @ref{File Ports}.")
2380 #define FUNC_NAME s_scm_sys_make_void_port
2382 return scm_i_void_port (scm_i_mode_bits (mode
));
2387 /* Initialization. */
2392 /* lseek() symbols. */
2393 scm_c_define ("SEEK_SET", scm_from_int (SEEK_SET
));
2394 scm_c_define ("SEEK_CUR", scm_from_int (SEEK_CUR
));
2395 scm_c_define ("SEEK_END", scm_from_int (SEEK_END
));
2397 scm_tc16_void_port
= scm_make_port_type ("void", fill_input_void_port
,
2400 cur_inport_fluid
= scm_make_fluid ();
2401 cur_outport_fluid
= scm_make_fluid ();
2402 cur_errport_fluid
= scm_make_fluid ();
2403 cur_loadport_fluid
= scm_make_fluid ();
2405 scm_i_port_weak_hash
= scm_make_weak_key_hash_table (SCM_I_MAKINUM(31));
2407 #include "libguile/ports.x"
2409 /* Use Latin-1 as the default port encoding. */
2410 SCM_VARIABLE_SET (default_port_encoding_var
, scm_make_fluid ());
2411 scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var
), SCM_BOOL_F
);
2412 scm_port_encoding_init
= 1;
2414 SCM_VARIABLE_SET (scm_conversion_strategy
, scm_make_fluid ());
2415 scm_fluid_set_x (SCM_VARIABLE_REF (scm_conversion_strategy
),
2416 scm_from_int ((int) SCM_FAILED_CONVERSION_QUESTION_MARK
));
2417 scm_conversion_strategy_init
= 1;