1 /* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004,
2 * 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public License
6 * as published by the Free Software Foundation; either version 3 of
7 * the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
24 #define _LARGEFILE64_SOURCE /* ask for stat64 etc */
32 #include <fcntl.h> /* for chsize on mingw */
37 #include <striconveh.h>
41 #include "libguile/_scm.h"
42 #include "libguile/async.h"
43 #include "libguile/deprecation.h"
44 #include "libguile/eval.h"
45 #include "libguile/fports.h" /* direct access for seek and truncate */
46 #include "libguile/goops.h"
47 #include "libguile/smob.h"
48 #include "libguile/chars.h"
49 #include "libguile/dynwind.h"
51 #include "libguile/keywords.h"
52 #include "libguile/hashtab.h"
53 #include "libguile/root.h"
54 #include "libguile/strings.h"
55 #include "libguile/mallocs.h"
56 #include "libguile/validate.h"
57 #include "libguile/ports.h"
58 #include "libguile/vectors.h"
59 #include "libguile/weaks.h"
60 #include "libguile/fluids.h"
61 #include "libguile/eq.h"
75 #ifdef HAVE_SYS_IOCTL_H
76 #include <sys/ioctl.h>
79 /* Mingw (version 3.4.5, circa 2006) has ftruncate as an alias for chsize
80 already, but have this code here in case that wasn't so in past versions,
81 or perhaps to help other minimal DOS environments.
83 gnulib ftruncate.c has code using fcntl F_CHSIZE and F_FREESP, which
84 might be possibilities if we've got other systems without ftruncate. */
86 #if defined HAVE_CHSIZE && ! defined HAVE_FTRUNCATE
87 #define ftruncate(fd, size) chsize (fd, size)
89 #define HAVE_FTRUNCATE 1
93 /* The port kind table --- a dynamically resized array of port types. */
96 /* scm_ptobs scm_numptob
97 * implement a dynamically resized array of ptob records.
98 * Indexes into this table are used when generating type
99 * tags for smobjects (if you know a tag you can get an index and conversely).
101 scm_t_ptob_descriptor
*scm_ptobs
= NULL
;
102 long scm_numptob
= 0;
104 /* GC marker for a port with stream of SCM type. */
106 scm_markstream (SCM ptr
)
109 openp
= SCM_CELL_WORD_0 (ptr
) & SCM_OPN
;
111 return SCM_PACK (SCM_STREAM (ptr
));
117 * We choose to use an interface similar to the smob interface with
118 * fill_input and write as standard fields, passed to the port
119 * type constructor, and optional fields set by setters.
123 flush_port_default (SCM port SCM_UNUSED
)
128 end_input_default (SCM port SCM_UNUSED
, int offset SCM_UNUSED
)
133 scm_make_port_type (char *name
,
134 int (*fill_input
) (SCM port
),
135 void (*write
) (SCM port
, const void *data
, size_t size
))
138 if (SCM_I_MAX_PORT_TYPE_COUNT
- 1 <= scm_numptob
)
140 SCM_CRITICAL_SECTION_START
;
141 tmp
= (char *) scm_gc_realloc ((char *) scm_ptobs
,
142 scm_numptob
* sizeof (scm_t_ptob_descriptor
),
144 * sizeof (scm_t_ptob_descriptor
),
148 scm_ptobs
= (scm_t_ptob_descriptor
*) tmp
;
150 scm_ptobs
[scm_numptob
].name
= name
;
151 scm_ptobs
[scm_numptob
].mark
= 0;
152 scm_ptobs
[scm_numptob
].free
= NULL
;
153 scm_ptobs
[scm_numptob
].print
= scm_port_print
;
154 scm_ptobs
[scm_numptob
].equalp
= 0;
155 scm_ptobs
[scm_numptob
].close
= 0;
157 scm_ptobs
[scm_numptob
].write
= write
;
158 scm_ptobs
[scm_numptob
].flush
= flush_port_default
;
160 scm_ptobs
[scm_numptob
].end_input
= end_input_default
;
161 scm_ptobs
[scm_numptob
].fill_input
= fill_input
;
162 scm_ptobs
[scm_numptob
].input_waiting
= 0;
164 scm_ptobs
[scm_numptob
].seek
= 0;
165 scm_ptobs
[scm_numptob
].truncate
= 0;
169 SCM_CRITICAL_SECTION_END
;
173 scm_memory_error ("scm_make_port_type");
175 /* Make a class object if Goops is present */
176 if (SCM_UNPACK (scm_port_class
[0]) != 0)
177 scm_make_port_classes (scm_numptob
- 1, SCM_PTOBNAME (scm_numptob
- 1));
178 return scm_tc7_port
+ (scm_numptob
- 1) * 256;
182 scm_set_port_mark (scm_t_bits tc
, SCM (*mark
) (SCM
))
184 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].mark
= mark
;
188 scm_set_port_free (scm_t_bits tc
, size_t (*free
) (SCM
))
190 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].free
= free
;
194 scm_set_port_print (scm_t_bits tc
, int (*print
) (SCM exp
, SCM port
,
195 scm_print_state
*pstate
))
197 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].print
= print
;
201 scm_set_port_equalp (scm_t_bits tc
, SCM (*equalp
) (SCM
, SCM
))
203 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].equalp
= equalp
;
207 scm_set_port_flush (scm_t_bits tc
, void (*flush
) (SCM port
))
209 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].flush
= flush
;
213 scm_set_port_end_input (scm_t_bits tc
, void (*end_input
) (SCM port
, int offset
))
215 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].end_input
= end_input
;
219 scm_set_port_close (scm_t_bits tc
, int (*close
) (SCM
))
221 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].close
= close
;
225 scm_set_port_seek (scm_t_bits tc
,
226 scm_t_off (*seek
) (SCM
, scm_t_off
, int))
228 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].seek
= seek
;
232 scm_set_port_truncate (scm_t_bits tc
, void (*truncate
) (SCM
, scm_t_off
))
234 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].truncate
= truncate
;
238 scm_set_port_input_waiting (scm_t_bits tc
, int (*input_waiting
) (SCM
))
240 scm_ptobs
[SCM_TC2PTOBNUM (tc
)].input_waiting
= input_waiting
;
245 SCM_DEFINE (scm_char_ready_p
, "char-ready?", 0, 1, 0,
247 "Return @code{#t} if a character is ready on input @var{port}\n"
248 "and return @code{#f} otherwise. If @code{char-ready?} returns\n"
249 "@code{#t} then the next @code{read-char} operation on\n"
250 "@var{port} is guaranteed not to hang. If @var{port} is a file\n"
251 "port at end of file then @code{char-ready?} returns @code{#t}.\n"
253 "@code{char-ready?} exists to make it possible for a\n"
254 "program to accept characters from interactive ports without\n"
255 "getting stuck waiting for input. Any input editors associated\n"
256 "with such ports must make sure that characters whose existence\n"
257 "has been asserted by @code{char-ready?} cannot be rubbed out.\n"
258 "If @code{char-ready?} were to return @code{#f} at end of file,\n"
259 "a port at end of file would be indistinguishable from an\n"
260 "interactive port that has no ready characters.")
261 #define FUNC_NAME s_scm_char_ready_p
265 if (SCM_UNBNDP (port
))
266 port
= scm_current_input_port ();
267 /* It's possible to close the current input port, so validate even in
269 SCM_VALIDATE_OPINPORT (1, port
);
271 pt
= SCM_PTAB_ENTRY (port
);
273 /* if the current read buffer is filled, or the
274 last pushed-back char has been read and the saved buffer is
275 filled, result is true. */
276 if (pt
->read_pos
< pt
->read_end
277 || (pt
->read_buf
== pt
->putback_buf
278 && pt
->saved_read_pos
< pt
->saved_read_end
))
282 scm_t_ptob_descriptor
*ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
284 if (ptob
->input_waiting
)
285 return scm_from_bool(ptob
->input_waiting (port
));
292 /* move up to read_len chars from port's putback and/or read buffers
293 into memory starting at dest. returns the number of chars moved. */
294 size_t scm_take_from_input_buffers (SCM port
, char *dest
, size_t read_len
)
296 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
297 size_t chars_read
= 0;
298 size_t from_buf
= min (pt
->read_end
- pt
->read_pos
, read_len
);
302 memcpy (dest
, pt
->read_pos
, from_buf
);
303 pt
->read_pos
+= from_buf
;
304 chars_read
+= from_buf
;
305 read_len
-= from_buf
;
309 /* if putback was active, try the real input buffer too. */
310 if (pt
->read_buf
== pt
->putback_buf
)
312 from_buf
= min (pt
->saved_read_end
- pt
->saved_read_pos
, read_len
);
315 memcpy (dest
, pt
->saved_read_pos
, from_buf
);
316 pt
->saved_read_pos
+= from_buf
;
317 chars_read
+= from_buf
;
323 /* Clear a port's read buffers, returning the contents. */
324 SCM_DEFINE (scm_drain_input
, "drain-input", 1, 0, 0,
326 "This procedure clears a port's input buffers, similar\n"
327 "to the way that force-output clears the output buffer. The\n"
328 "contents of the buffers are returned as a single string, e.g.,\n"
331 "(define p (open-input-file ...))\n"
332 "(drain-input p) => empty string, nothing buffered yet.\n"
333 "(unread-char (read-char p) p)\n"
334 "(drain-input p) => initial chars from p, up to the buffer size.\n"
336 "Draining the buffers may be useful for cleanly finishing\n"
337 "buffered I/O so that the file descriptor can be used directly\n"
338 "for further input.")
339 #define FUNC_NAME s_scm_drain_input
346 SCM_VALIDATE_OPINPORT (1, port
);
347 pt
= SCM_PTAB_ENTRY (port
);
349 count
= pt
->read_end
- pt
->read_pos
;
350 if (pt
->read_buf
== pt
->putback_buf
)
351 count
+= pt
->saved_read_end
- pt
->saved_read_pos
;
355 result
= scm_i_make_string (count
, &data
);
356 scm_take_from_input_buffers (port
, data
, count
);
359 result
= scm_nullstr
;
366 /* Standard ports --- current input, output, error, and more(!). */
368 static SCM cur_inport_fluid
= 0;
369 static SCM cur_outport_fluid
= 0;
370 static SCM cur_errport_fluid
= 0;
371 static SCM cur_loadport_fluid
= 0;
373 SCM_DEFINE (scm_current_input_port
, "current-input-port", 0, 0, 0,
375 "Return the current input port. This is the default port used\n"
376 "by many input procedures. Initially, @code{current-input-port}\n"
377 "returns the @dfn{standard input} in Unix and C terminology.")
378 #define FUNC_NAME s_scm_current_input_port
380 if (cur_inport_fluid
)
381 return scm_fluid_ref (cur_inport_fluid
);
387 SCM_DEFINE (scm_current_output_port
, "current-output-port", 0, 0, 0,
389 "Return the current output port. This is the default port used\n"
390 "by many output procedures. Initially,\n"
391 "@code{current-output-port} returns the @dfn{standard output} in\n"
392 "Unix and C terminology.")
393 #define FUNC_NAME s_scm_current_output_port
395 if (cur_outport_fluid
)
396 return scm_fluid_ref (cur_outport_fluid
);
402 SCM_DEFINE (scm_current_error_port
, "current-error-port", 0, 0, 0,
404 "Return the port to which errors and warnings should be sent (the\n"
405 "@dfn{standard error} in Unix and C terminology).")
406 #define FUNC_NAME s_scm_current_error_port
408 if (cur_errport_fluid
)
409 return scm_fluid_ref (cur_errport_fluid
);
415 SCM_DEFINE (scm_current_load_port
, "current-load-port", 0, 0, 0,
417 "Return the current-load-port.\n"
418 "The load port is used internally by @code{primitive-load}.")
419 #define FUNC_NAME s_scm_current_load_port
421 return scm_fluid_ref (cur_loadport_fluid
);
425 SCM_DEFINE (scm_set_current_input_port
, "set-current-input-port", 1, 0, 0,
427 "@deffnx {Scheme Procedure} set-current-output-port port\n"
428 "@deffnx {Scheme Procedure} set-current-error-port port\n"
429 "Change the ports returned by @code{current-input-port},\n"
430 "@code{current-output-port} and @code{current-error-port}, respectively,\n"
431 "so that they use the supplied @var{port} for input or output.")
432 #define FUNC_NAME s_scm_set_current_input_port
434 SCM oinp
= scm_fluid_ref (cur_inport_fluid
);
435 SCM_VALIDATE_OPINPORT (1, port
);
436 scm_fluid_set_x (cur_inport_fluid
, port
);
442 SCM_DEFINE (scm_set_current_output_port
, "set-current-output-port", 1, 0, 0,
444 "Set the current default output port to @var{port}.")
445 #define FUNC_NAME s_scm_set_current_output_port
447 SCM ooutp
= scm_fluid_ref (cur_outport_fluid
);
448 port
= SCM_COERCE_OUTPORT (port
);
449 SCM_VALIDATE_OPOUTPORT (1, port
);
450 scm_fluid_set_x (cur_outport_fluid
, port
);
456 SCM_DEFINE (scm_set_current_error_port
, "set-current-error-port", 1, 0, 0,
458 "Set the current default error port to @var{port}.")
459 #define FUNC_NAME s_scm_set_current_error_port
461 SCM oerrp
= scm_fluid_ref (cur_errport_fluid
);
462 port
= SCM_COERCE_OUTPORT (port
);
463 SCM_VALIDATE_OPOUTPORT (1, port
);
464 scm_fluid_set_x (cur_errport_fluid
, port
);
470 scm_dynwind_current_input_port (SCM port
)
471 #define FUNC_NAME NULL
473 SCM_VALIDATE_OPINPORT (1, port
);
474 scm_dynwind_fluid (cur_inport_fluid
, port
);
479 scm_dynwind_current_output_port (SCM port
)
480 #define FUNC_NAME NULL
482 port
= SCM_COERCE_OUTPORT (port
);
483 SCM_VALIDATE_OPOUTPORT (1, port
);
484 scm_dynwind_fluid (cur_outport_fluid
, port
);
489 scm_dynwind_current_error_port (SCM port
)
490 #define FUNC_NAME NULL
492 port
= SCM_COERCE_OUTPORT (port
);
493 SCM_VALIDATE_OPOUTPORT (1, port
);
494 scm_dynwind_fluid (cur_errport_fluid
, port
);
499 scm_i_dynwind_current_load_port (SCM port
)
501 scm_dynwind_fluid (cur_loadport_fluid
, port
);
505 /* The port table --- an array of pointers to ports. */
508 We need a global registry of ports to flush them all at exit, and to
509 get all the ports matching a file descriptor.
511 SCM scm_i_port_weak_hash
;
513 scm_i_pthread_mutex_t scm_i_port_table_mutex
= SCM_I_PTHREAD_MUTEX_INITIALIZER
;
516 /* Port finalization. */
519 static void finalize_port (GC_PTR
, GC_PTR
);
521 /* Register a finalizer for PORT. */
522 static SCM_C_INLINE_KEYWORD
void
523 register_finalizer_for_port (SCM port
)
526 GC_finalization_proc prev_finalizer
;
527 GC_PTR prev_finalization_data
;
529 port_type
= SCM_TC2PTOBNUM (SCM_CELL_TYPE (port
));
531 /* Register a finalizer for PORT so that its iconv CDs get freed and
532 optionally its type's `free' function gets called. */
533 GC_REGISTER_FINALIZER_NO_ORDER (SCM2PTR (port
), finalize_port
, 0,
535 &prev_finalization_data
);
538 /* Finalize the object (a port) pointed to by PTR. */
540 finalize_port (GC_PTR ptr
, GC_PTR data
)
543 SCM port
= PTR2SCM (ptr
);
545 if (!SCM_PORTP (port
))
548 if (SCM_OPENP (port
))
550 if (SCM_REVEALED (port
) > 0)
551 /* Keep "revealed" ports alive and re-register a finalizer. */
552 register_finalizer_for_port (port
);
557 port_type
= SCM_TC2PTOBNUM (SCM_CELL_TYPE (port
));
558 if (port_type
>= scm_numptob
)
561 if (scm_ptobs
[port_type
].free
)
562 /* Yes, I really do mean `.free' rather than `.close'. `.close'
563 is for explicit `close-port' by user. */
564 scm_ptobs
[port_type
].free (port
);
566 entry
= SCM_PTAB_ENTRY (port
);
568 if (entry
->input_cd
!= (iconv_t
) -1)
569 iconv_close (entry
->input_cd
);
570 if (entry
->output_cd
!= (iconv_t
) -1)
571 iconv_close (entry
->output_cd
);
573 SCM_SETSTREAM (port
, 0);
574 SCM_CLR_PORT_OPEN_FLAG (port
);
576 scm_gc_ports_collected
++;
585 /* This function is not and should not be thread safe. */
587 scm_new_port_table_entry (scm_t_bits tag
)
588 #define FUNC_NAME "scm_new_port_table_entry"
591 We initialize the cell to empty, this is in case scm_gc_calloc
592 triggers GC ; we don't want the GC to scan a half-finished Z.
595 SCM z
= scm_cons (SCM_EOL
, SCM_EOL
);
596 scm_t_port
*entry
= (scm_t_port
*) scm_gc_calloc (sizeof (scm_t_port
), "port");
599 entry
->file_name
= SCM_BOOL_F
;
600 entry
->rw_active
= SCM_PORT_NEITHER
;
603 /* Initialize this port with the thread's current default
605 enc
= scm_i_default_port_encoding ();
606 entry
->encoding
= enc
? scm_gc_strdup (enc
, "port") : NULL
;
608 /* The conversion descriptors will be opened lazily. */
609 entry
->input_cd
= (iconv_t
) -1;
610 entry
->output_cd
= (iconv_t
) -1;
612 entry
->ilseq_handler
= scm_i_get_conversion_strategy (SCM_BOOL_F
);
614 SCM_SET_CELL_TYPE (z
, tag
);
615 SCM_SETPTAB_ENTRY (z
, entry
);
617 scm_hashq_set_x (scm_i_port_weak_hash
, z
, SCM_BOOL_F
);
619 /* For each new port, register a finalizer so that it port type's free
620 function can be invoked eventually. */
621 register_finalizer_for_port (z
);
627 #if SCM_ENABLE_DEPRECATED==1
629 scm_add_to_port_table (SCM port
)
634 scm_c_issue_deprecation_warning ("scm_add_to_port_table is deprecated.");
636 scm_i_pthread_mutex_lock (&scm_i_port_table_mutex
);
637 z
= scm_new_port_table_entry (scm_tc7_port
);
638 pt
= SCM_PTAB_ENTRY(z
);
640 SCM_SETCAR (z
, SCM_EOL
);
641 SCM_SETCDR (z
, SCM_EOL
);
642 SCM_SETPTAB_ENTRY (port
, pt
);
643 scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex
);
650 /* Remove a port from the table and destroy it. */
653 scm_i_remove_port (SCM port
)
654 #define FUNC_NAME "scm_remove_port"
658 scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex
);
660 p
= SCM_PTAB_ENTRY (port
);
661 scm_port_non_buffer (p
);
662 p
->putback_buf
= NULL
;
663 p
->putback_buf_size
= 0;
665 if (p
->input_cd
!= (iconv_t
) -1)
667 iconv_close (p
->input_cd
);
668 p
->input_cd
= (iconv_t
) -1;
671 if (p
->output_cd
!= (iconv_t
) -1)
673 iconv_close (p
->output_cd
);
674 p
->output_cd
= (iconv_t
) -1;
677 SCM_SETPTAB_ENTRY (port
, 0);
679 scm_hashq_remove_x (scm_i_port_weak_hash
, port
);
681 scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex
);
686 /* Functions for debugging. */
688 SCM_DEFINE (scm_pt_size
, "pt-size", 0, 0, 0,
690 "Return the number of ports in the port table. @code{pt-size}\n"
691 "is only included in @code{--enable-guile-debug} builds.")
692 #define FUNC_NAME s_scm_pt_size
694 return scm_from_int (SCM_HASHTABLE_N_ITEMS (scm_i_port_weak_hash
));
700 scm_port_non_buffer (scm_t_port
*pt
)
702 pt
->read_pos
= pt
->read_buf
= pt
->read_end
= &pt
->shortbuf
;
703 pt
->write_buf
= pt
->write_pos
= &pt
->shortbuf
;
704 pt
->read_buf_size
= pt
->write_buf_size
= 1;
705 pt
->write_end
= pt
->write_buf
+ pt
->write_buf_size
;
709 /* Revealed counts --- an oddity inherited from SCSH. */
711 /* Find a port in the table and return its revealed count.
712 Also used by the garbage collector.
716 scm_revealed_count (SCM port
)
718 return SCM_REVEALED(port
);
723 /* Return the revealed count for a port. */
725 SCM_DEFINE (scm_port_revealed
, "port-revealed", 1, 0, 0,
727 "Return the revealed count for @var{port}.")
728 #define FUNC_NAME s_scm_port_revealed
730 port
= SCM_COERCE_OUTPORT (port
);
731 SCM_VALIDATE_OPENPORT (1, port
);
732 return scm_from_int (scm_revealed_count (port
));
736 /* Set the revealed count for a port. */
737 SCM_DEFINE (scm_set_port_revealed_x
, "set-port-revealed!", 2, 0, 0,
738 (SCM port
, SCM rcount
),
739 "Sets the revealed count for a port to a given value.\n"
740 "The return value is unspecified.")
741 #define FUNC_NAME s_scm_set_port_revealed_x
743 port
= SCM_COERCE_OUTPORT (port
);
744 SCM_VALIDATE_OPENPORT (1, port
);
745 SCM_REVEALED (port
) = scm_to_int (rcount
);
746 return SCM_UNSPECIFIED
;
752 /* Retrieving a port's mode. */
754 /* Return the flags that characterize a port based on the mode
755 * string used to open a file for that port.
757 * See PORT FLAGS in scm.h
761 scm_i_mode_bits_n (SCM modes
)
764 | (scm_i_string_contains_char (modes
, 'r')
765 || scm_i_string_contains_char (modes
, '+') ? SCM_RDNG
: 0)
766 | (scm_i_string_contains_char (modes
, 'w')
767 || scm_i_string_contains_char (modes
, 'a')
768 || scm_i_string_contains_char (modes
, '+') ? SCM_WRTNG
: 0)
769 | (scm_i_string_contains_char (modes
, '0') ? SCM_BUF0
: 0)
770 | (scm_i_string_contains_char (modes
, 'l') ? SCM_BUFLINE
: 0));
774 scm_mode_bits (char *modes
)
776 return scm_i_mode_bits (scm_from_locale_string (modes
));
780 scm_i_mode_bits (SCM modes
)
784 if (!scm_is_string (modes
))
785 scm_wrong_type_arg_msg (NULL
, 0, modes
, "string");
787 bits
= scm_i_mode_bits_n (modes
);
788 scm_remember_upto_here_1 (modes
);
792 /* Return the mode flags from an open port.
793 * Some modes such as "append" are only used when opening
794 * a file and are not returned here. */
796 SCM_DEFINE (scm_port_mode
, "port-mode", 1, 0, 0,
798 "Return the port modes associated with the open port @var{port}.\n"
799 "These will not necessarily be identical to the modes used when\n"
800 "the port was opened, since modes such as \"append\" which are\n"
801 "used only during port creation are not retained.")
802 #define FUNC_NAME s_scm_port_mode
807 port
= SCM_COERCE_OUTPORT (port
);
808 SCM_VALIDATE_OPPORT (1, port
);
809 if (SCM_CELL_WORD_0 (port
) & SCM_RDNG
) {
810 if (SCM_CELL_WORD_0 (port
) & SCM_WRTNG
)
811 strcpy (modes
, "r+");
815 else if (SCM_CELL_WORD_0 (port
) & SCM_WRTNG
)
817 if (SCM_CELL_WORD_0 (port
) & SCM_BUF0
)
819 return scm_from_locale_string (modes
);
828 * Call the close operation on a port object.
829 * see also scm_close.
831 SCM_DEFINE (scm_close_port
, "close-port", 1, 0, 0,
833 "Close the specified port object. Return @code{#t} if it\n"
834 "successfully closes a port or @code{#f} if it was already\n"
835 "closed. An exception may be raised if an error occurs, for\n"
836 "example when flushing buffered output. See also @ref{Ports and\n"
837 "File Descriptors, close}, for a procedure which can close file\n"
839 #define FUNC_NAME s_scm_close_port
844 port
= SCM_COERCE_OUTPORT (port
);
846 SCM_VALIDATE_PORT (1, port
);
847 if (SCM_CLOSEDP (port
))
849 i
= SCM_PTOBNUM (port
);
850 if (scm_ptobs
[i
].close
)
851 rv
= (scm_ptobs
[i
].close
) (port
);
854 scm_i_remove_port (port
);
855 SCM_CLR_PORT_OPEN_FLAG (port
);
856 return scm_from_bool (rv
>= 0);
860 SCM_DEFINE (scm_close_input_port
, "close-input-port", 1, 0, 0,
862 "Close the specified input port object. The routine has no effect if\n"
863 "the file has already been closed. An exception may be raised if an\n"
864 "error occurs. The value returned is unspecified.\n\n"
865 "See also @ref{Ports and File Descriptors, close}, for a procedure\n"
866 "which can close file descriptors.")
867 #define FUNC_NAME s_scm_close_input_port
869 SCM_VALIDATE_INPUT_PORT (1, port
);
870 scm_close_port (port
);
871 return SCM_UNSPECIFIED
;
875 SCM_DEFINE (scm_close_output_port
, "close-output-port", 1, 0, 0,
877 "Close the specified output port object. The routine has no effect if\n"
878 "the file has already been closed. An exception may be raised if an\n"
879 "error occurs. The value returned is unspecified.\n\n"
880 "See also @ref{Ports and File Descriptors, close}, for a procedure\n"
881 "which can close file descriptors.")
882 #define FUNC_NAME s_scm_close_output_port
884 port
= SCM_COERCE_OUTPORT (port
);
885 SCM_VALIDATE_OUTPUT_PORT (1, port
);
886 scm_close_port (port
);
887 return SCM_UNSPECIFIED
;
892 collect_keys (void *unused
, SCM key
, SCM value
, SCM result
)
894 return scm_cons (key
, result
);
898 scm_c_port_for_each (void (*proc
)(void *data
, SCM p
), void *data
)
902 /* Copy out the port table as a list so that we get strong references
903 to all the values. */
904 scm_i_pthread_mutex_lock (&scm_i_port_table_mutex
);
905 ports
= scm_internal_hash_fold (collect_keys
, NULL
,
906 SCM_EOL
, scm_i_port_weak_hash
);
907 scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex
);
909 for (; scm_is_pair (ports
); ports
= scm_cdr (ports
))
911 SCM p
= scm_car (ports
);
917 SCM_DEFINE (scm_port_for_each
, "port-for-each", 1, 0, 0,
919 "Apply @var{proc} to each port in the Guile port table\n"
920 "in turn. The return value is unspecified. More specifically,\n"
921 "@var{proc} is applied exactly once to every port that exists\n"
922 "in the system at the time @var{port-for-each} is invoked.\n"
923 "Changes to the port table while @var{port-for-each} is running\n"
924 "have no effect as far as @var{port-for-each} is concerned.")
925 #define FUNC_NAME s_scm_port_for_each
927 SCM_VALIDATE_PROC (1, proc
);
929 scm_c_port_for_each ((void (*)(void*,SCM
))scm_call_1
, proc
);
930 return SCM_UNSPECIFIED
;
936 /* Utter miscellany. Gosh, we should clean this up some time. */
938 SCM_DEFINE (scm_input_port_p
, "input-port?", 1, 0, 0,
940 "Return @code{#t} if @var{x} is an input port, otherwise return\n"
941 "@code{#f}. Any object satisfying this predicate also satisfies\n"
943 #define FUNC_NAME s_scm_input_port_p
945 return scm_from_bool (SCM_INPUT_PORT_P (x
));
949 SCM_DEFINE (scm_output_port_p
, "output-port?", 1, 0, 0,
951 "Return @code{#t} if @var{x} is an output port, otherwise return\n"
952 "@code{#f}. Any object satisfying this predicate also satisfies\n"
954 #define FUNC_NAME s_scm_output_port_p
956 x
= SCM_COERCE_OUTPORT (x
);
957 return scm_from_bool (SCM_OUTPUT_PORT_P (x
));
961 SCM_DEFINE (scm_port_p
, "port?", 1, 0, 0,
963 "Return a boolean indicating whether @var{x} is a port.\n"
964 "Equivalent to @code{(or (input-port? @var{x}) (output-port?\n"
966 #define FUNC_NAME s_scm_port_p
968 return scm_from_bool (SCM_PORTP (x
));
972 SCM_DEFINE (scm_port_closed_p
, "port-closed?", 1, 0, 0,
974 "Return @code{#t} if @var{port} is closed or @code{#f} if it is\n"
976 #define FUNC_NAME s_scm_port_closed_p
978 SCM_VALIDATE_PORT (1, port
);
979 return scm_from_bool (!SCM_OPPORTP (port
));
983 SCM_DEFINE (scm_eof_object_p
, "eof-object?", 1, 0, 0,
985 "Return @code{#t} if @var{x} is an end-of-file object; otherwise\n"
987 #define FUNC_NAME s_scm_eof_object_p
989 return scm_from_bool(SCM_EOF_OBJECT_P (x
));
993 SCM_DEFINE (scm_force_output
, "force-output", 0, 1, 0,
995 "Flush the specified output port, or the current output port if @var{port}\n"
996 "is omitted. The current output buffer contents are passed to the\n"
997 "underlying port implementation (e.g., in the case of fports, the\n"
998 "data will be written to the file and the output buffer will be cleared.)\n"
999 "It has no effect on an unbuffered port.\n\n"
1000 "The return value is unspecified.")
1001 #define FUNC_NAME s_scm_force_output
1003 if (SCM_UNBNDP (port
))
1004 port
= scm_current_output_port ();
1007 port
= SCM_COERCE_OUTPORT (port
);
1008 SCM_VALIDATE_OPOUTPORT (1, port
);
1011 return SCM_UNSPECIFIED
;
1017 flush_output_port (void *closure
, SCM port
)
1019 if (SCM_OPOUTPORTP (port
))
1023 SCM_DEFINE (scm_flush_all_ports
, "flush-all-ports", 0, 0, 0,
1025 "Equivalent to calling @code{force-output} on\n"
1026 "all open output ports. The return value is unspecified.")
1027 #define FUNC_NAME s_scm_flush_all_ports
1029 scm_c_port_for_each (&flush_output_port
, NULL
);
1030 return SCM_UNSPECIFIED
;
1034 SCM_DEFINE (scm_read_char
, "read-char", 0, 1, 0,
1036 "Return the next character available from @var{port}, updating\n"
1037 "@var{port} to point to the following character. If no more\n"
1038 "characters are available, the end-of-file object is returned.\n"
1040 "When @var{port}'s data cannot be decoded according to its\n"
1041 "character encoding, a @code{decoding-error} is raised and\n"
1042 "@var{port} points past the erroneous byte sequence.\n")
1043 #define FUNC_NAME s_scm_read_char
1046 if (SCM_UNBNDP (port
))
1047 port
= scm_current_input_port ();
1048 SCM_VALIDATE_OPINPORT (1, port
);
1049 c
= scm_getc (port
);
1052 return SCM_MAKE_CHAR (c
);
1056 /* Update the line and column number of PORT after consumption of C. */
1058 update_port_lf (scm_t_wchar c
, SCM port
)
1082 #define SCM_MBCHAR_BUF_SIZE (4)
1084 /* Convert the SIZE-byte UTF-8 sequence in UTF8_BUF to a codepoint.
1085 UTF8_BUF is assumed to contain a valid UTF-8 sequence. */
1087 utf8_to_codepoint (const scm_t_uint8
*utf8_buf
, size_t size
)
1089 scm_t_wchar codepoint
;
1091 if (utf8_buf
[0] <= 0x7f)
1094 codepoint
= utf8_buf
[0];
1096 else if ((utf8_buf
[0] & 0xe0) == 0xc0)
1099 codepoint
= ((scm_t_wchar
) utf8_buf
[0] & 0x1f) << 6UL
1100 | (utf8_buf
[1] & 0x3f);
1102 else if ((utf8_buf
[0] & 0xf0) == 0xe0)
1105 codepoint
= ((scm_t_wchar
) utf8_buf
[0] & 0x0f) << 12UL
1106 | ((scm_t_wchar
) utf8_buf
[1] & 0x3f) << 6UL
1107 | (utf8_buf
[2] & 0x3f);
1112 codepoint
= ((scm_t_wchar
) utf8_buf
[0] & 0x07) << 18UL
1113 | ((scm_t_wchar
) utf8_buf
[1] & 0x3f) << 12UL
1114 | ((scm_t_wchar
) utf8_buf
[2] & 0x3f) << 6UL
1115 | (utf8_buf
[3] & 0x3f);
1121 /* Read a codepoint from PORT and return it in *CODEPOINT. Fill BUF
1122 with the byte representation of the codepoint in PORT's encoding, and
1123 set *LEN to the length in bytes of that representation. Return 0 on
1124 success and an errno value on error. */
1126 get_codepoint (SCM port
, scm_t_wchar
*codepoint
,
1127 char buf
[SCM_MBCHAR_BUF_SIZE
], size_t *len
)
1130 size_t bytes_consumed
, output_size
;
1132 scm_t_uint8 utf8_buf
[SCM_MBCHAR_BUF_SIZE
];
1133 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1135 if (SCM_UNLIKELY (pt
->input_cd
== (iconv_t
) -1))
1136 /* Initialize the conversion descriptors. */
1137 scm_i_set_port_encoding_x (port
, pt
->encoding
);
1139 for (output_size
= 0, output
= (char *) utf8_buf
,
1140 bytes_consumed
= 0, err
= 0;
1141 err
== 0 && output_size
== 0
1142 && (bytes_consumed
== 0 || byte_read
!= EOF
);
1146 size_t input_left
, output_left
, done
;
1148 byte_read
= scm_get_byte_or_eof (port
);
1149 if (byte_read
== EOF
)
1151 if (bytes_consumed
== 0)
1153 *codepoint
= (scm_t_wchar
) EOF
;
1161 buf
[bytes_consumed
] = byte_read
;
1164 input_left
= bytes_consumed
+ 1;
1165 output_left
= sizeof (utf8_buf
);
1167 done
= iconv (pt
->input_cd
, &input
, &input_left
,
1168 &output
, &output_left
);
1169 if (done
== (size_t) -1)
1173 /* Missing input: keep trying. */
1177 output_size
= sizeof (utf8_buf
) - output_left
;
1180 if (SCM_UNLIKELY (err
!= 0))
1182 /* Reset the `iconv' state. */
1183 iconv (pt
->input_cd
, NULL
, NULL
, NULL
, NULL
);
1185 if (pt
->ilseq_handler
== SCM_ICONVEH_QUESTION_MARK
)
1191 /* Fail when the strategy is SCM_ICONVEH_ERROR or
1192 SCM_ICONVEH_ESCAPE_SEQUENCE (the latter doesn't make sense for
1193 input encoding errors.) */
1196 /* Convert the UTF8_BUF sequence to a Unicode code point. */
1197 *codepoint
= utf8_to_codepoint (utf8_buf
, output_size
);
1199 if (SCM_LIKELY (err
== 0))
1200 update_port_lf (*codepoint
, port
);
1202 *len
= bytes_consumed
;
1207 /* Read a codepoint from PORT and return it. */
1210 #define FUNC_NAME "scm_getc"
1214 scm_t_wchar codepoint
;
1215 char buf
[SCM_MBCHAR_BUF_SIZE
];
1217 err
= get_codepoint (port
, &codepoint
, buf
, &len
);
1218 if (SCM_UNLIKELY (err
!= 0))
1219 /* At this point PORT should point past the invalid encoding, as per
1220 R6RS-lib Section 8.2.4. */
1221 scm_decoding_error (FUNC_NAME
, err
, "input decoding error", port
);
1227 /* this should only be called when the read buffer is empty. it
1228 tries to refill the read buffer. it returns the first char from
1229 the port, which is either EOF or *(pt->read_pos). */
1231 scm_fill_input (SCM port
)
1233 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1235 assert (pt
->read_pos
== pt
->read_end
);
1237 if (pt
->read_buf
== pt
->putback_buf
)
1239 /* finished reading put-back chars. */
1240 pt
->read_buf
= pt
->saved_read_buf
;
1241 pt
->read_pos
= pt
->saved_read_pos
;
1242 pt
->read_end
= pt
->saved_read_end
;
1243 pt
->read_buf_size
= pt
->saved_read_buf_size
;
1244 if (pt
->read_pos
< pt
->read_end
)
1245 return *(pt
->read_pos
);
1247 return scm_ptobs
[SCM_PTOBNUM (port
)].fill_input (port
);
1253 * This function differs from scm_c_write; it updates port line and
1257 scm_lfwrite (const char *ptr
, size_t size
, SCM port
)
1259 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1260 scm_t_ptob_descriptor
*ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
1262 if (pt
->rw_active
== SCM_PORT_READ
)
1263 scm_end_input (port
);
1265 ptob
->write (port
, ptr
, size
);
1267 for (; size
; ptr
++, size
--)
1268 update_port_lf ((scm_t_wchar
) (unsigned char) *ptr
, port
);
1271 pt
->rw_active
= SCM_PORT_WRITE
;
1274 /* Write STR to PORT from START inclusive to END exclusive. */
1276 scm_lfwrite_substr (SCM str
, size_t start
, size_t end
, SCM port
)
1278 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1280 if (pt
->rw_active
== SCM_PORT_READ
)
1281 scm_end_input (port
);
1283 if (end
== (size_t) -1)
1284 end
= scm_i_string_length (str
);
1286 scm_display (scm_c_substring (str
, start
, end
), port
);
1289 pt
->rw_active
= SCM_PORT_WRITE
;
1294 * Used by an application to read arbitrary number of bytes from an
1295 * SCM port. Same semantics as libc read, except that scm_c_read only
1296 * returns less than SIZE bytes if at end-of-file.
1298 * Warning: Doesn't update port line and column counts! */
1300 /* This structure, and the following swap_buffer function, are used
1301 for temporarily swapping a port's own read buffer, and the buffer
1302 that the caller of scm_c_read provides. */
1303 struct port_and_swap_buffer
1306 unsigned char *buffer
;
1311 swap_buffer (void *data
)
1313 struct port_and_swap_buffer
*psb
= (struct port_and_swap_buffer
*) data
;
1314 unsigned char *old_buf
= psb
->pt
->read_buf
;
1315 size_t old_size
= psb
->pt
->read_buf_size
;
1317 /* Make the port use (buffer, size) from the struct. */
1318 psb
->pt
->read_pos
= psb
->pt
->read_buf
= psb
->pt
->read_end
= psb
->buffer
;
1319 psb
->pt
->read_buf_size
= psb
->size
;
1321 /* Save the port's old (buffer, size) in the struct. */
1322 psb
->buffer
= old_buf
;
1323 psb
->size
= old_size
;
1327 scm_c_read (SCM port
, void *buffer
, size_t size
)
1328 #define FUNC_NAME "scm_c_read"
1331 size_t n_read
= 0, n_available
;
1332 struct port_and_swap_buffer psb
;
1334 SCM_VALIDATE_OPINPORT (1, port
);
1336 pt
= SCM_PTAB_ENTRY (port
);
1337 if (pt
->rw_active
== SCM_PORT_WRITE
)
1338 scm_ptobs
[SCM_PTOBNUM (port
)].flush (port
);
1341 pt
->rw_active
= SCM_PORT_READ
;
1343 /* Take bytes first from the port's read buffer. */
1344 if (pt
->read_pos
< pt
->read_end
)
1346 n_available
= min (size
, pt
->read_end
- pt
->read_pos
);
1347 memcpy (buffer
, pt
->read_pos
, n_available
);
1348 buffer
= (char *) buffer
+ n_available
;
1349 pt
->read_pos
+= n_available
;
1350 n_read
+= n_available
;
1351 size
-= n_available
;
1354 /* Avoid the scm_dynwind_* costs if we now have enough data. */
1358 /* Now we will call scm_fill_input repeatedly until we have read the
1359 requested number of bytes. (Note that a single scm_fill_input
1360 call does not guarantee to fill the whole of the port's read
1362 if (pt
->read_buf_size
<= 1 && pt
->encoding
== NULL
)
1364 /* The port that we are reading from is unbuffered - i.e. does
1365 not have its own persistent buffer - but we have a buffer,
1366 provided by our caller, that is the right size for the data
1367 that is wanted. For the following scm_fill_input calls,
1368 therefore, we use the buffer in hand as the port's read
1371 We need to make sure that the port's normal (1 byte) buffer
1372 is reinstated in case one of the scm_fill_input () calls
1373 throws an exception; we use the scm_dynwind_* API to achieve
1376 A consequence of this optimization is that the fill_input
1377 functions can't unget characters. That'll push data to the
1378 pushback buffer instead of this psb buffer. */
1380 unsigned char *pback
= pt
->putback_buf
;
1383 psb
.buffer
= buffer
;
1385 scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE
);
1386 scm_dynwind_rewind_handler (swap_buffer
, &psb
, SCM_F_WIND_EXPLICITLY
);
1387 scm_dynwind_unwind_handler (swap_buffer
, &psb
, SCM_F_WIND_EXPLICITLY
);
1389 /* Call scm_fill_input until we have all the bytes that we need,
1391 while (pt
->read_buf_size
&& (scm_fill_input (port
) != EOF
))
1393 pt
->read_buf_size
-= (pt
->read_end
- pt
->read_pos
);
1394 pt
->read_pos
= pt
->read_buf
= pt
->read_end
;
1397 if (pback
!= pt
->putback_buf
1398 || pt
->read_buf
- (unsigned char *) buffer
< 0)
1399 scm_misc_error (FUNC_NAME
,
1400 "scm_c_read must not call a fill function that pushes "
1401 "back characters onto an unbuffered port", SCM_EOL
);
1403 n_read
+= pt
->read_buf
- (unsigned char *) buffer
;
1405 /* Reinstate the port's normal buffer. */
1410 /* The port has its own buffer. It is important that we use it,
1411 even if it happens to be smaller than our caller's buffer, so
1412 that a custom port implementation's entry points (in
1413 particular, fill_input) can rely on the buffer always being
1414 the same as they first set up. */
1415 while (size
&& (scm_fill_input (port
) != EOF
))
1417 n_available
= min (size
, pt
->read_end
- pt
->read_pos
);
1418 memcpy (buffer
, pt
->read_pos
, n_available
);
1419 buffer
= (char *) buffer
+ n_available
;
1420 pt
->read_pos
+= n_available
;
1421 n_read
+= n_available
;
1422 size
-= n_available
;
1432 * Used by an application to write arbitrary number of bytes to an SCM
1433 * port. Similar semantics as libc write. However, unlike libc
1434 * write, scm_c_write writes the requested number of bytes and has no
1437 * Warning: Doesn't update port line and column counts!
1441 scm_c_write (SCM port
, const void *ptr
, size_t size
)
1442 #define FUNC_NAME "scm_c_write"
1445 scm_t_ptob_descriptor
*ptob
;
1447 SCM_VALIDATE_OPOUTPORT (1, port
);
1449 pt
= SCM_PTAB_ENTRY (port
);
1450 ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
1452 if (pt
->rw_active
== SCM_PORT_READ
)
1453 scm_end_input (port
);
1455 ptob
->write (port
, ptr
, size
);
1458 pt
->rw_active
= SCM_PORT_WRITE
;
1463 scm_flush (SCM port
)
1465 long i
= SCM_PTOBNUM (port
);
1467 (scm_ptobs
[i
].flush
) (port
);
1471 scm_end_input (SCM port
)
1474 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1476 if (pt
->read_buf
== pt
->putback_buf
)
1478 offset
= pt
->read_end
- pt
->read_pos
;
1479 pt
->read_buf
= pt
->saved_read_buf
;
1480 pt
->read_pos
= pt
->saved_read_pos
;
1481 pt
->read_end
= pt
->saved_read_end
;
1482 pt
->read_buf_size
= pt
->saved_read_buf_size
;
1487 scm_ptobs
[SCM_PTOBNUM (port
)].end_input (port
, offset
);
1494 scm_unget_byte (int c
, SCM port
)
1495 #define FUNC_NAME "scm_unget_byte"
1497 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1499 if (pt
->read_buf
== pt
->putback_buf
)
1500 /* already using the put-back buffer. */
1502 /* enlarge putback_buf if necessary. */
1503 if (pt
->read_end
== pt
->read_buf
+ pt
->read_buf_size
1504 && pt
->read_buf
== pt
->read_pos
)
1506 size_t new_size
= pt
->read_buf_size
* 2;
1507 unsigned char *tmp
= (unsigned char *)
1508 scm_gc_realloc (pt
->putback_buf
, pt
->read_buf_size
, new_size
,
1511 pt
->read_pos
= pt
->read_buf
= pt
->putback_buf
= tmp
;
1512 pt
->read_end
= pt
->read_buf
+ pt
->read_buf_size
;
1513 pt
->read_buf_size
= pt
->putback_buf_size
= new_size
;
1516 /* shift any existing bytes to buffer + 1. */
1517 if (pt
->read_pos
== pt
->read_end
)
1518 pt
->read_end
= pt
->read_buf
+ 1;
1519 else if (pt
->read_pos
!= pt
->read_buf
+ 1)
1521 int count
= pt
->read_end
- pt
->read_pos
;
1523 memmove (pt
->read_buf
+ 1, pt
->read_pos
, count
);
1524 pt
->read_end
= pt
->read_buf
+ 1 + count
;
1527 pt
->read_pos
= pt
->read_buf
;
1530 /* switch to the put-back buffer. */
1532 if (pt
->putback_buf
== NULL
)
1535 = (unsigned char *) scm_gc_malloc_pointerless
1536 (SCM_INITIAL_PUTBACK_BUF_SIZE
, "putback buffer");
1537 pt
->putback_buf_size
= SCM_INITIAL_PUTBACK_BUF_SIZE
;
1540 pt
->saved_read_buf
= pt
->read_buf
;
1541 pt
->saved_read_pos
= pt
->read_pos
;
1542 pt
->saved_read_end
= pt
->read_end
;
1543 pt
->saved_read_buf_size
= pt
->read_buf_size
;
1545 pt
->read_pos
= pt
->read_buf
= pt
->putback_buf
;
1546 pt
->read_end
= pt
->read_buf
+ 1;
1547 pt
->read_buf_size
= pt
->putback_buf_size
;
1553 pt
->rw_active
= SCM_PORT_READ
;
1558 scm_ungetc (scm_t_wchar c
, SCM port
)
1559 #define FUNC_NAME "scm_ungetc"
1561 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1563 char result_buf
[10];
1564 const char *encoding
;
1568 if (pt
->encoding
!= NULL
)
1569 encoding
= pt
->encoding
;
1571 encoding
= "ISO-8859-1";
1573 len
= sizeof (result_buf
);
1574 result
= u32_conv_to_encoding (encoding
,
1575 (enum iconv_ilseq_handler
) pt
->ilseq_handler
,
1576 (uint32_t *) &c
, 1, NULL
,
1579 if (SCM_UNLIKELY (result
== NULL
|| len
== 0))
1580 scm_encoding_error (FUNC_NAME
, errno
,
1581 "conversion to port encoding failed",
1582 SCM_BOOL_F
, SCM_MAKE_CHAR (c
));
1584 for (i
= len
- 1; i
>= 0; i
--)
1585 scm_unget_byte (result
[i
], port
);
1587 if (SCM_UNLIKELY (result
!= result_buf
))
1592 /* What should col be in this case?
1593 * We'll leave it at -1.
1595 SCM_LINUM (port
) -= 1;
1604 scm_ungets (const char *s
, int n
, SCM port
)
1606 /* This is simple minded and inefficient, but unreading strings is
1607 * probably not a common operation, and remember that line and
1608 * column numbers have to be handled...
1610 * Please feel free to write an optimized version!
1613 scm_ungetc (s
[n
], port
);
1617 SCM_DEFINE (scm_peek_char
, "peek-char", 0, 1, 0,
1619 "Return the next character available from @var{port},\n"
1620 "@emph{without} updating @var{port} to point to the following\n"
1621 "character. If no more characters are available, the\n"
1622 "end-of-file object is returned.\n"
1624 "The value returned by\n"
1625 "a call to @code{peek-char} is the same as the value that would\n"
1626 "have been returned by a call to @code{read-char} on the same\n"
1627 "port. The only difference is that the very next call to\n"
1628 "@code{read-char} or @code{peek-char} on that @var{port} will\n"
1629 "return the value returned by the preceding call to\n"
1630 "@code{peek-char}. In particular, a call to @code{peek-char} on\n"
1631 "an interactive port will hang waiting for input whenever a call\n"
1632 "to @code{read-char} would have hung.\n"
1634 "As for @code{read-char}, a @code{decoding-error} may be raised\n"
1635 "if such a situation occurs. However, unlike with @code{read-char},\n"
1636 "@var{port} still points at the beginning of the erroneous byte\n"
1637 "sequence when the error is raised.\n")
1638 #define FUNC_NAME s_scm_peek_char
1643 char bytes
[SCM_MBCHAR_BUF_SIZE
];
1644 long column
, line
, i
;
1647 if (SCM_UNBNDP (port
))
1648 port
= scm_current_input_port ();
1649 SCM_VALIDATE_OPINPORT (1, port
);
1651 column
= SCM_COL (port
);
1652 line
= SCM_LINUM (port
);
1654 err
= get_codepoint (port
, &c
, bytes
, &len
);
1656 for (i
= len
- 1; i
>= 0; i
--)
1657 scm_unget_byte (bytes
[i
], port
);
1659 SCM_COL (port
) = column
;
1660 SCM_LINUM (port
) = line
;
1662 if (SCM_UNLIKELY (err
!= 0))
1664 scm_decoding_error (FUNC_NAME
, err
, "input decoding error", port
);
1666 /* Shouldn't happen since `catch' always aborts to prompt. */
1667 result
= SCM_BOOL_F
;
1670 result
= SCM_EOF_VAL
;
1672 result
= SCM_MAKE_CHAR (c
);
1678 SCM_DEFINE (scm_unread_char
, "unread-char", 1, 1, 0,
1679 (SCM cobj
, SCM port
),
1680 "Place @var{char} in @var{port} so that it will be read by the\n"
1681 "next read operation. If called multiple times, the unread characters\n"
1682 "will be read again in last-in first-out order. If @var{port} is\n"
1683 "not supplied, the current input port is used.")
1684 #define FUNC_NAME s_scm_unread_char
1688 SCM_VALIDATE_CHAR (1, cobj
);
1689 if (SCM_UNBNDP (port
))
1690 port
= scm_current_input_port ();
1691 SCM_VALIDATE_OPINPORT (2, port
);
1693 c
= SCM_CHAR (cobj
);
1695 scm_ungetc (c
, port
);
1700 SCM_DEFINE (scm_unread_string
, "unread-string", 2, 0, 0,
1701 (SCM str
, SCM port
),
1702 "Place the string @var{str} in @var{port} so that its characters will be\n"
1703 "read in subsequent read operations. If called multiple times, the\n"
1704 "unread characters will be read again in last-in first-out order. If\n"
1705 "@var{port} is not supplied, the current-input-port is used.")
1706 #define FUNC_NAME s_scm_unread_string
1709 SCM_VALIDATE_STRING (1, str
);
1710 if (SCM_UNBNDP (port
))
1711 port
= scm_current_input_port ();
1712 SCM_VALIDATE_OPINPORT (2, port
);
1714 n
= scm_i_string_length (str
);
1717 scm_ungetc (scm_i_string_ref (str
, n
), port
);
1723 SCM_DEFINE (scm_seek
, "seek", 3, 0, 0,
1724 (SCM fd_port
, SCM offset
, SCM whence
),
1725 "Sets the current position of @var{fd/port} to the integer\n"
1726 "@var{offset}, which is interpreted according to the value of\n"
1729 "One of the following variables should be supplied for\n"
1731 "@defvar SEEK_SET\n"
1732 "Seek from the beginning of the file.\n"
1734 "@defvar SEEK_CUR\n"
1735 "Seek from the current position.\n"
1737 "@defvar SEEK_END\n"
1738 "Seek from the end of the file.\n"
1740 "If @var{fd/port} is a file descriptor, the underlying system\n"
1741 "call is @code{lseek}. @var{port} may be a string port.\n"
1743 "The value returned is the new position in the file. This means\n"
1744 "that the current position of a port can be obtained using:\n"
1746 "(seek port 0 SEEK_CUR)\n"
1748 #define FUNC_NAME s_scm_seek
1752 fd_port
= SCM_COERCE_OUTPORT (fd_port
);
1754 how
= scm_to_int (whence
);
1755 if (how
!= SEEK_SET
&& how
!= SEEK_CUR
&& how
!= SEEK_END
)
1756 SCM_OUT_OF_RANGE (3, whence
);
1758 if (SCM_OPPORTP (fd_port
))
1760 scm_t_ptob_descriptor
*ptob
= scm_ptobs
+ SCM_PTOBNUM (fd_port
);
1761 off_t_or_off64_t off
= scm_to_off_t_or_off64_t (offset
);
1762 off_t_or_off64_t rv
;
1765 SCM_MISC_ERROR ("port is not seekable",
1766 scm_cons (fd_port
, SCM_EOL
));
1768 rv
= ptob
->seek (fd_port
, off
, how
);
1769 return scm_from_off_t_or_off64_t (rv
);
1771 else /* file descriptor?. */
1773 off_t_or_off64_t off
= scm_to_off_t_or_off64_t (offset
);
1774 off_t_or_off64_t rv
;
1775 rv
= lseek_or_lseek64 (scm_to_int (fd_port
), off
, how
);
1778 return scm_from_off_t_or_off64_t (rv
);
1787 /* Mingw has ftruncate(), perhaps implemented above using chsize, but
1788 doesn't have the filename version truncate(), hence this code. */
1789 #if HAVE_FTRUNCATE && ! HAVE_TRUNCATE
1791 truncate (const char *file
, off_t length
)
1795 fdes
= open (file
, O_BINARY
| O_WRONLY
);
1799 ret
= ftruncate (fdes
, length
);
1802 int save_errno
= errno
;
1808 return close (fdes
);
1810 #endif /* HAVE_FTRUNCATE && ! HAVE_TRUNCATE */
1812 SCM_DEFINE (scm_truncate_file
, "truncate-file", 1, 1, 0,
1813 (SCM object
, SCM length
),
1814 "Truncate @var{file} to @var{length} bytes. @var{file} can be a\n"
1815 "filename string, a port object, or an integer file descriptor.\n"
1816 "The return value is unspecified.\n"
1818 "For a port or file descriptor @var{length} can be omitted, in\n"
1819 "which case the file is truncated at the current position (per\n"
1820 "@code{ftell} above).\n"
1822 "On most systems a file can be extended by giving a length\n"
1823 "greater than the current size, but this is not mandatory in the\n"
1825 #define FUNC_NAME s_scm_truncate_file
1829 /* "object" can be a port, fdes or filename.
1831 Negative "length" makes no sense, but it's left to truncate() or
1832 ftruncate() to give back an error for that (normally EINVAL).
1835 if (SCM_UNBNDP (length
))
1837 /* must supply length if object is a filename. */
1838 if (scm_is_string (object
))
1839 SCM_MISC_ERROR("must supply length if OBJECT is a filename", SCM_EOL
);
1841 length
= scm_seek (object
, SCM_INUM0
, scm_from_int (SEEK_CUR
));
1844 object
= SCM_COERCE_OUTPORT (object
);
1845 if (scm_is_integer (object
))
1847 off_t_or_off64_t c_length
= scm_to_off_t_or_off64_t (length
);
1848 SCM_SYSCALL (rv
= ftruncate_or_ftruncate64 (scm_to_int (object
),
1851 else if (SCM_OPOUTPORTP (object
))
1853 off_t_or_off64_t c_length
= scm_to_off_t_or_off64_t (length
);
1854 scm_t_port
*pt
= SCM_PTAB_ENTRY (object
);
1855 scm_t_ptob_descriptor
*ptob
= scm_ptobs
+ SCM_PTOBNUM (object
);
1857 if (!ptob
->truncate
)
1858 SCM_MISC_ERROR ("port is not truncatable", SCM_EOL
);
1859 if (pt
->rw_active
== SCM_PORT_READ
)
1860 scm_end_input (object
);
1861 else if (pt
->rw_active
== SCM_PORT_WRITE
)
1862 ptob
->flush (object
);
1864 ptob
->truncate (object
, c_length
);
1869 off_t_or_off64_t c_length
= scm_to_off_t_or_off64_t (length
);
1870 char *str
= scm_to_locale_string (object
);
1872 SCM_SYSCALL (rv
= truncate_or_truncate64 (str
, c_length
));
1879 return SCM_UNSPECIFIED
;
1883 SCM_DEFINE (scm_port_line
, "port-line", 1, 0, 0,
1885 "Return the current line number for @var{port}.\n"
1887 "The first line of a file is 0. But you might want to add 1\n"
1888 "when printing line numbers, since starting from 1 is\n"
1889 "traditional in error messages, and likely to be more natural to\n"
1891 #define FUNC_NAME s_scm_port_line
1893 port
= SCM_COERCE_OUTPORT (port
);
1894 SCM_VALIDATE_OPENPORT (1, port
);
1895 return scm_from_long (SCM_LINUM (port
));
1899 SCM_DEFINE (scm_set_port_line_x
, "set-port-line!", 2, 0, 0,
1900 (SCM port
, SCM line
),
1901 "Set the current line number for @var{port} to @var{line}. The\n"
1902 "first line of a file is 0.")
1903 #define FUNC_NAME s_scm_set_port_line_x
1905 port
= SCM_COERCE_OUTPORT (port
);
1906 SCM_VALIDATE_OPENPORT (1, port
);
1907 SCM_PTAB_ENTRY (port
)->line_number
= scm_to_long (line
);
1908 return SCM_UNSPECIFIED
;
1912 SCM_DEFINE (scm_port_column
, "port-column", 1, 0, 0,
1914 "Return the current column number of @var{port}.\n"
1915 "If the number is\n"
1916 "unknown, the result is #f. Otherwise, the result is a 0-origin integer\n"
1917 "- i.e. the first character of the first line is line 0, column 0.\n"
1918 "(However, when you display a file position, for example in an error\n"
1919 "message, we recommend you add 1 to get 1-origin integers. This is\n"
1920 "because lines and column numbers traditionally start with 1, and that is\n"
1921 "what non-programmers will find most natural.)")
1922 #define FUNC_NAME s_scm_port_column
1924 port
= SCM_COERCE_OUTPORT (port
);
1925 SCM_VALIDATE_OPENPORT (1, port
);
1926 return scm_from_int (SCM_COL (port
));
1930 SCM_DEFINE (scm_set_port_column_x
, "set-port-column!", 2, 0, 0,
1931 (SCM port
, SCM column
),
1932 "Set the current column of @var{port}. Before reading the first\n"
1933 "character on a line the column should be 0.")
1934 #define FUNC_NAME s_scm_set_port_column_x
1936 port
= SCM_COERCE_OUTPORT (port
);
1937 SCM_VALIDATE_OPENPORT (1, port
);
1938 SCM_PTAB_ENTRY (port
)->column_number
= scm_to_int (column
);
1939 return SCM_UNSPECIFIED
;
1943 SCM_DEFINE (scm_port_filename
, "port-filename", 1, 0, 0,
1945 "Return the filename associated with @var{port}. This function returns\n"
1946 "the strings \"standard input\", \"standard output\" and \"standard error\"\n"
1947 "when called on the current input, output and error ports respectively.")
1948 #define FUNC_NAME s_scm_port_filename
1950 port
= SCM_COERCE_OUTPORT (port
);
1951 SCM_VALIDATE_OPENPORT (1, port
);
1952 return SCM_FILENAME (port
);
1956 SCM_DEFINE (scm_set_port_filename_x
, "set-port-filename!", 2, 0, 0,
1957 (SCM port
, SCM filename
),
1958 "Change the filename associated with @var{port}, using the current input\n"
1959 "port if none is specified. Note that this does not change the port's\n"
1960 "source of data, but only the value that is returned by\n"
1961 "@code{port-filename} and reported in diagnostic output.")
1962 #define FUNC_NAME s_scm_set_port_filename_x
1964 port
= SCM_COERCE_OUTPORT (port
);
1965 SCM_VALIDATE_OPENPORT (1, port
);
1966 /* We allow the user to set the filename to whatever he likes. */
1967 SCM_SET_FILENAME (port
, filename
);
1968 return SCM_UNSPECIFIED
;
1972 /* A fluid specifying the default encoding for newly created ports. If it is
1973 a string, that is the encoding. If it is #f, it is in the "native"
1974 (Latin-1) encoding. */
1975 SCM_VARIABLE (default_port_encoding_var
, "%default-port-encoding");
1977 static int scm_port_encoding_init
= 0;
1979 /* Use ENCODING as the default encoding for future ports. */
1981 scm_i_set_default_port_encoding (const char *encoding
)
1983 if (!scm_port_encoding_init
1984 || !scm_is_fluid (SCM_VARIABLE_REF (default_port_encoding_var
)))
1985 scm_misc_error (NULL
, "tried to set port encoding fluid before it is initialized",
1988 if (encoding
== NULL
1989 || !strcmp (encoding
, "ASCII")
1990 || !strcmp (encoding
, "ANSI_X3.4-1968")
1991 || !strcmp (encoding
, "ISO-8859-1"))
1992 scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var
), SCM_BOOL_F
);
1994 scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var
),
1995 scm_from_locale_string (encoding
));
1998 /* Return the name of the default encoding for newly created ports; a
1999 return value of NULL means "ISO-8859-1". */
2001 scm_i_default_port_encoding (void)
2003 if (!scm_port_encoding_init
)
2005 else if (!scm_is_fluid (SCM_VARIABLE_REF (default_port_encoding_var
)))
2011 encoding
= scm_fluid_ref (SCM_VARIABLE_REF (default_port_encoding_var
));
2012 if (!scm_is_string (encoding
))
2015 return scm_i_string_chars (encoding
);
2020 scm_i_set_port_encoding_x (SCM port
, const char *encoding
)
2023 iconv_t new_input_cd
, new_output_cd
;
2025 new_input_cd
= (iconv_t
) -1;
2026 new_output_cd
= (iconv_t
) -1;
2028 /* Set the character encoding for this port. */
2029 pt
= SCM_PTAB_ENTRY (port
);
2031 if (encoding
== NULL
)
2032 encoding
= "ISO-8859-1";
2034 pt
->encoding
= scm_gc_strdup (encoding
, "port");
2036 if (SCM_CELL_WORD_0 (port
) & SCM_RDNG
)
2038 /* Open an input iconv conversion descriptor, from ENCODING
2039 to UTF-8. We choose UTF-8, not UTF-32, because iconv
2040 implementations can typically convert from anything to
2041 UTF-8, but not to UTF-32 (see
2042 <http://lists.gnu.org/archive/html/bug-libunistring/2010-09/msg00007.html>). */
2043 new_input_cd
= iconv_open ("UTF-8", encoding
);
2044 if (new_input_cd
== (iconv_t
) -1)
2045 goto invalid_encoding
;
2048 if (SCM_CELL_WORD_0 (port
) & SCM_WRTNG
)
2050 new_output_cd
= iconv_open (encoding
, "UTF-8");
2051 if (new_output_cd
== (iconv_t
) -1)
2053 if (new_input_cd
!= (iconv_t
) -1)
2054 iconv_close (new_input_cd
);
2055 goto invalid_encoding
;
2059 if (pt
->input_cd
!= (iconv_t
) -1)
2060 iconv_close (pt
->input_cd
);
2061 if (pt
->output_cd
!= (iconv_t
) -1)
2062 iconv_close (pt
->output_cd
);
2064 pt
->input_cd
= new_input_cd
;
2065 pt
->output_cd
= new_output_cd
;
2072 err
= scm_from_locale_string (encoding
);
2073 scm_misc_error ("scm_i_set_port_encoding_x",
2074 "invalid or unknown character encoding ~s",
2079 SCM_DEFINE (scm_port_encoding
, "port-encoding", 1, 0, 0,
2081 "Returns, as a string, the character encoding that @var{port}\n"
2082 "uses to interpret its input and output.\n")
2083 #define FUNC_NAME s_scm_port_encoding
2088 SCM_VALIDATE_PORT (1, port
);
2090 pt
= SCM_PTAB_ENTRY (port
);
2093 return scm_from_locale_string (pt
->encoding
);
2099 SCM_DEFINE (scm_set_port_encoding_x
, "set-port-encoding!", 2, 0, 0,
2100 (SCM port
, SCM enc
),
2101 "Sets the character encoding that will be used to interpret all\n"
2102 "port I/O. New ports are created with the encoding\n"
2103 "appropriate for the current locale if @code{setlocale} has \n"
2104 "been called or ISO-8859-1 otherwise\n"
2105 "and this procedure can be used to modify that encoding.\n")
2106 #define FUNC_NAME s_scm_set_port_encoding_x
2110 SCM_VALIDATE_PORT (1, port
);
2111 SCM_VALIDATE_STRING (2, enc
);
2113 enc_str
= scm_to_locale_string (enc
);
2114 scm_i_set_port_encoding_x (port
, enc_str
);
2117 return SCM_UNSPECIFIED
;
2122 /* This determines how conversions handle unconvertible characters. */
2123 SCM_GLOBAL_VARIABLE (scm_conversion_strategy
, "%port-conversion-strategy");
2124 static int scm_conversion_strategy_init
= 0;
2126 scm_t_string_failed_conversion_handler
2127 scm_i_get_conversion_strategy (SCM port
)
2131 if (scm_is_false (port
))
2133 if (!scm_conversion_strategy_init
2134 || !scm_is_fluid (SCM_VARIABLE_REF (scm_conversion_strategy
)))
2135 return SCM_FAILED_CONVERSION_QUESTION_MARK
;
2138 encoding
= scm_fluid_ref (SCM_VARIABLE_REF (scm_conversion_strategy
));
2139 if (scm_is_false (encoding
))
2140 return SCM_FAILED_CONVERSION_QUESTION_MARK
;
2142 return (scm_t_string_failed_conversion_handler
) scm_to_int (encoding
);
2148 pt
= SCM_PTAB_ENTRY (port
);
2149 return pt
->ilseq_handler
;
2155 scm_i_set_conversion_strategy_x (SCM port
,
2156 scm_t_string_failed_conversion_handler handler
)
2161 strategy
= scm_from_int ((int) handler
);
2163 if (scm_is_false (port
))
2165 /* Set the default encoding for future ports. */
2166 if (!scm_conversion_strategy
2167 || !scm_is_fluid (SCM_VARIABLE_REF (scm_conversion_strategy
)))
2168 scm_misc_error (NULL
, "tried to set conversion strategy fluid before it is initialized",
2170 scm_fluid_set_x (SCM_VARIABLE_REF (scm_conversion_strategy
), strategy
);
2174 /* Set the character encoding for this port. */
2175 pt
= SCM_PTAB_ENTRY (port
);
2176 pt
->ilseq_handler
= handler
;
2180 SCM_DEFINE (scm_port_conversion_strategy
, "port-conversion-strategy",
2181 1, 0, 0, (SCM port
),
2182 "Returns the behavior of the port when handling a character that\n"
2183 "is not representable in the port's current encoding.\n"
2184 "It returns the symbol @code{error} if unrepresentable characters\n"
2185 "should cause exceptions, @code{substitute} if the port should\n"
2186 "try to replace unrepresentable characters with question marks or\n"
2187 "approximate characters, or @code{escape} if unrepresentable\n"
2188 "characters should be converted to string escapes.\n"
2190 "If @var{port} is @code{#f}, then the current default behavior\n"
2191 "will be returned. New ports will have this default behavior\n"
2192 "when they are created.\n")
2193 #define FUNC_NAME s_scm_port_conversion_strategy
2195 scm_t_string_failed_conversion_handler h
;
2197 SCM_VALIDATE_OPPORT (1, port
);
2199 if (!scm_is_false (port
))
2201 SCM_VALIDATE_OPPORT (1, port
);
2204 h
= scm_i_get_conversion_strategy (port
);
2205 if (h
== SCM_FAILED_CONVERSION_ERROR
)
2206 return scm_from_latin1_symbol ("error");
2207 else if (h
== SCM_FAILED_CONVERSION_QUESTION_MARK
)
2208 return scm_from_latin1_symbol ("substitute");
2209 else if (h
== SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE
)
2210 return scm_from_latin1_symbol ("escape");
2214 /* Never gets here. */
2215 return SCM_UNDEFINED
;
2219 SCM_DEFINE (scm_set_port_conversion_strategy_x
, "set-port-conversion-strategy!",
2221 (SCM port
, SCM sym
),
2222 "Sets the behavior of the interpreter when outputting a character\n"
2223 "that is not representable in the port's current encoding.\n"
2224 "@var{sym} can be either @code{'error}, @code{'substitute}, or\n"
2225 "@code{'escape}. If it is @code{'error}, an error will be thrown\n"
2226 "when an unconvertible character is encountered. If it is\n"
2227 "@code{'substitute}, then unconvertible characters will \n"
2228 "be replaced with approximate characters, or with question marks\n"
2229 "if no approximately correct character is available.\n"
2230 "If it is @code{'escape},\n"
2231 "it will appear as a hex escape when output.\n"
2233 "If @var{port} is an open port, the conversion error behavior\n"
2234 "is set for that port. If it is @code{#f}, it is set as the\n"
2235 "default behavior for any future ports that get created in\n"
2237 #define FUNC_NAME s_scm_set_port_conversion_strategy_x
2243 if (!scm_is_false (port
))
2245 SCM_VALIDATE_OPPORT (1, port
);
2248 err
= scm_from_latin1_symbol ("error");
2249 if (scm_is_true (scm_eqv_p (sym
, err
)))
2251 scm_i_set_conversion_strategy_x (port
, SCM_FAILED_CONVERSION_ERROR
);
2252 return SCM_UNSPECIFIED
;
2255 qm
= scm_from_latin1_symbol ("substitute");
2256 if (scm_is_true (scm_eqv_p (sym
, qm
)))
2258 scm_i_set_conversion_strategy_x (port
,
2259 SCM_FAILED_CONVERSION_QUESTION_MARK
);
2260 return SCM_UNSPECIFIED
;
2263 esc
= scm_from_latin1_symbol ("escape");
2264 if (scm_is_true (scm_eqv_p (sym
, esc
)))
2266 scm_i_set_conversion_strategy_x (port
,
2267 SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE
);
2268 return SCM_UNSPECIFIED
;
2271 SCM_MISC_ERROR ("unknown conversion behavior ~s", scm_list_1 (sym
));
2273 return SCM_UNSPECIFIED
;
2280 scm_print_port_mode (SCM exp
, SCM port
)
2282 scm_puts (SCM_CLOSEDP (exp
)
2284 : (SCM_RDNG
& SCM_CELL_WORD_0 (exp
)
2285 ? (SCM_WRTNG
& SCM_CELL_WORD_0 (exp
)
2288 : (SCM_WRTNG
& SCM_CELL_WORD_0 (exp
)
2295 scm_port_print (SCM exp
, SCM port
, scm_print_state
*pstate SCM_UNUSED
)
2297 char *type
= SCM_PTOBNAME (SCM_PTOBNUM (exp
));
2300 scm_puts ("#<", port
);
2301 scm_print_port_mode (exp
, port
);
2302 scm_puts (type
, port
);
2303 scm_putc (' ', port
);
2304 scm_uintprint (SCM_CELL_WORD_1 (exp
), 16, port
);
2305 scm_putc ('>', port
);
2313 scm_t_bits scm_tc16_void_port
= 0;
2315 static int fill_input_void_port (SCM port SCM_UNUSED
)
2321 write_void_port (SCM port SCM_UNUSED
,
2322 const void *data SCM_UNUSED
,
2323 size_t size SCM_UNUSED
)
2328 scm_i_void_port (long mode_bits
)
2330 scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex
);
2332 SCM answer
= scm_new_port_table_entry (scm_tc16_void_port
);
2333 scm_t_port
* pt
= SCM_PTAB_ENTRY(answer
);
2335 scm_port_non_buffer (pt
);
2337 SCM_SETSTREAM (answer
, 0);
2338 SCM_SET_CELL_TYPE (answer
, scm_tc16_void_port
| mode_bits
);
2339 scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex
);
2345 scm_void_port (char *mode_str
)
2347 return scm_i_void_port (scm_mode_bits (mode_str
));
2350 SCM_DEFINE (scm_sys_make_void_port
, "%make-void-port", 1, 0, 0,
2352 "Create and return a new void port. A void port acts like\n"
2353 "@file{/dev/null}. The @var{mode} argument\n"
2354 "specifies the input/output modes for this port: see the\n"
2355 "documentation for @code{open-file} in @ref{File Ports}.")
2356 #define FUNC_NAME s_scm_sys_make_void_port
2358 return scm_i_void_port (scm_i_mode_bits (mode
));
2363 /* Initialization. */
2368 /* lseek() symbols. */
2369 scm_c_define ("SEEK_SET", scm_from_int (SEEK_SET
));
2370 scm_c_define ("SEEK_CUR", scm_from_int (SEEK_CUR
));
2371 scm_c_define ("SEEK_END", scm_from_int (SEEK_END
));
2373 scm_tc16_void_port
= scm_make_port_type ("void", fill_input_void_port
,
2376 cur_inport_fluid
= scm_make_fluid ();
2377 cur_outport_fluid
= scm_make_fluid ();
2378 cur_errport_fluid
= scm_make_fluid ();
2379 cur_loadport_fluid
= scm_make_fluid ();
2381 scm_i_port_weak_hash
= scm_make_weak_key_hash_table (SCM_I_MAKINUM(31));
2383 #include "libguile/ports.x"
2385 /* Use Latin-1 as the default port encoding. */
2386 SCM_VARIABLE_SET (default_port_encoding_var
, scm_make_fluid ());
2387 scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var
), SCM_BOOL_F
);
2388 scm_port_encoding_init
= 1;
2390 SCM_VARIABLE_SET (scm_conversion_strategy
, scm_make_fluid ());
2391 scm_fluid_set_x (SCM_VARIABLE_REF (scm_conversion_strategy
),
2392 scm_from_int ((int) SCM_FAILED_CONVERSION_QUESTION_MARK
));
2393 scm_conversion_strategy_init
= 1;