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 ();
265 SCM_VALIDATE_OPINPORT (1, port
);
267 pt
= SCM_PTAB_ENTRY (port
);
269 /* if the current read buffer is filled, or the
270 last pushed-back char has been read and the saved buffer is
271 filled, result is true. */
272 if (pt
->read_pos
< pt
->read_end
273 || (pt
->read_buf
== pt
->putback_buf
274 && pt
->saved_read_pos
< pt
->saved_read_end
))
278 scm_t_ptob_descriptor
*ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
280 if (ptob
->input_waiting
)
281 return scm_from_bool(ptob
->input_waiting (port
));
288 /* move up to read_len chars from port's putback and/or read buffers
289 into memory starting at dest. returns the number of chars moved. */
290 size_t scm_take_from_input_buffers (SCM port
, char *dest
, size_t read_len
)
292 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
293 size_t chars_read
= 0;
294 size_t from_buf
= min (pt
->read_end
- pt
->read_pos
, read_len
);
298 memcpy (dest
, pt
->read_pos
, from_buf
);
299 pt
->read_pos
+= from_buf
;
300 chars_read
+= from_buf
;
301 read_len
-= from_buf
;
305 /* if putback was active, try the real input buffer too. */
306 if (pt
->read_buf
== pt
->putback_buf
)
308 from_buf
= min (pt
->saved_read_end
- pt
->saved_read_pos
, read_len
);
311 memcpy (dest
, pt
->saved_read_pos
, from_buf
);
312 pt
->saved_read_pos
+= from_buf
;
313 chars_read
+= from_buf
;
319 /* Clear a port's read buffers, returning the contents. */
320 SCM_DEFINE (scm_drain_input
, "drain-input", 1, 0, 0,
322 "This procedure clears a port's input buffers, similar\n"
323 "to the way that force-output clears the output buffer. The\n"
324 "contents of the buffers are returned as a single string, e.g.,\n"
327 "(define p (open-input-file ...))\n"
328 "(drain-input p) => empty string, nothing buffered yet.\n"
329 "(unread-char (read-char p) p)\n"
330 "(drain-input p) => initial chars from p, up to the buffer size.\n"
332 "Draining the buffers may be useful for cleanly finishing\n"
333 "buffered I/O so that the file descriptor can be used directly\n"
334 "for further input.")
335 #define FUNC_NAME s_scm_drain_input
342 SCM_VALIDATE_OPINPORT (1, port
);
343 pt
= SCM_PTAB_ENTRY (port
);
345 count
= pt
->read_end
- pt
->read_pos
;
346 if (pt
->read_buf
== pt
->putback_buf
)
347 count
+= pt
->saved_read_end
- pt
->saved_read_pos
;
349 result
= scm_i_make_string (count
, &data
);
350 scm_take_from_input_buffers (port
, data
, count
);
356 /* Standard ports --- current input, output, error, and more(!). */
358 static SCM cur_inport_fluid
= 0;
359 static SCM cur_outport_fluid
= 0;
360 static SCM cur_errport_fluid
= 0;
361 static SCM cur_loadport_fluid
= 0;
363 SCM_DEFINE (scm_current_input_port
, "current-input-port", 0, 0, 0,
365 "Return the current input port. This is the default port used\n"
366 "by many input procedures. Initially, @code{current-input-port}\n"
367 "returns the @dfn{standard input} in Unix and C terminology.")
368 #define FUNC_NAME s_scm_current_input_port
370 if (cur_inport_fluid
)
371 return scm_fluid_ref (cur_inport_fluid
);
377 SCM_DEFINE (scm_current_output_port
, "current-output-port", 0, 0, 0,
379 "Return the current output port. This is the default port used\n"
380 "by many output procedures. Initially,\n"
381 "@code{current-output-port} returns the @dfn{standard output} in\n"
382 "Unix and C terminology.")
383 #define FUNC_NAME s_scm_current_output_port
385 if (cur_outport_fluid
)
386 return scm_fluid_ref (cur_outport_fluid
);
392 SCM_DEFINE (scm_current_error_port
, "current-error-port", 0, 0, 0,
394 "Return the port to which errors and warnings should be sent (the\n"
395 "@dfn{standard error} in Unix and C terminology).")
396 #define FUNC_NAME s_scm_current_error_port
398 if (cur_errport_fluid
)
399 return scm_fluid_ref (cur_errport_fluid
);
405 SCM_DEFINE (scm_current_load_port
, "current-load-port", 0, 0, 0,
407 "Return the current-load-port.\n"
408 "The load port is used internally by @code{primitive-load}.")
409 #define FUNC_NAME s_scm_current_load_port
411 return scm_fluid_ref (cur_loadport_fluid
);
415 SCM_DEFINE (scm_set_current_input_port
, "set-current-input-port", 1, 0, 0,
417 "@deffnx {Scheme Procedure} set-current-output-port port\n"
418 "@deffnx {Scheme Procedure} set-current-error-port port\n"
419 "Change the ports returned by @code{current-input-port},\n"
420 "@code{current-output-port} and @code{current-error-port}, respectively,\n"
421 "so that they use the supplied @var{port} for input or output.")
422 #define FUNC_NAME s_scm_set_current_input_port
424 SCM oinp
= scm_fluid_ref (cur_inport_fluid
);
425 SCM_VALIDATE_OPINPORT (1, port
);
426 scm_fluid_set_x (cur_inport_fluid
, port
);
432 SCM_DEFINE (scm_set_current_output_port
, "set-current-output-port", 1, 0, 0,
434 "Set the current default output port to @var{port}.")
435 #define FUNC_NAME s_scm_set_current_output_port
437 SCM ooutp
= scm_fluid_ref (cur_outport_fluid
);
438 port
= SCM_COERCE_OUTPORT (port
);
439 SCM_VALIDATE_OPOUTPORT (1, port
);
440 scm_fluid_set_x (cur_outport_fluid
, port
);
446 SCM_DEFINE (scm_set_current_error_port
, "set-current-error-port", 1, 0, 0,
448 "Set the current default error port to @var{port}.")
449 #define FUNC_NAME s_scm_set_current_error_port
451 SCM oerrp
= scm_fluid_ref (cur_errport_fluid
);
452 port
= SCM_COERCE_OUTPORT (port
);
453 SCM_VALIDATE_OPOUTPORT (1, port
);
454 scm_fluid_set_x (cur_errport_fluid
, port
);
460 scm_dynwind_current_input_port (SCM port
)
461 #define FUNC_NAME NULL
463 SCM_VALIDATE_OPINPORT (1, port
);
464 scm_dynwind_fluid (cur_inport_fluid
, port
);
469 scm_dynwind_current_output_port (SCM port
)
470 #define FUNC_NAME NULL
472 port
= SCM_COERCE_OUTPORT (port
);
473 SCM_VALIDATE_OPOUTPORT (1, port
);
474 scm_dynwind_fluid (cur_outport_fluid
, port
);
479 scm_dynwind_current_error_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_errport_fluid
, port
);
489 scm_i_dynwind_current_load_port (SCM port
)
491 scm_dynwind_fluid (cur_loadport_fluid
, port
);
495 /* The port table --- an array of pointers to ports. */
498 We need a global registry of ports to flush them all at exit, and to
499 get all the ports matching a file descriptor.
501 SCM scm_i_port_weak_hash
;
503 scm_i_pthread_mutex_t scm_i_port_table_mutex
= SCM_I_PTHREAD_MUTEX_INITIALIZER
;
506 /* Port finalization. */
509 static void finalize_port (GC_PTR
, GC_PTR
);
511 /* Register a finalizer for PORT, if needed by its port type. */
512 static SCM_C_INLINE_KEYWORD
void
513 register_finalizer_for_port (SCM port
)
517 port_type
= SCM_TC2PTOBNUM (SCM_CELL_TYPE (port
));
518 if (scm_ptobs
[port_type
].free
)
520 GC_finalization_proc prev_finalizer
;
521 GC_PTR prev_finalization_data
;
523 GC_REGISTER_FINALIZER_NO_ORDER (SCM2PTR (port
), finalize_port
, 0,
525 &prev_finalization_data
);
529 /* Finalize the object (a port) pointed to by PTR. */
531 finalize_port (GC_PTR ptr
, GC_PTR data
)
534 SCM port
= PTR2SCM (ptr
);
536 if (!SCM_PORTP (port
))
539 if (SCM_OPENP (port
))
541 if (SCM_REVEALED (port
) > 0)
542 /* Keep "revealed" ports alive and re-register a finalizer. */
543 register_finalizer_for_port (port
);
546 port_type
= SCM_TC2PTOBNUM (SCM_CELL_TYPE (port
));
547 if (port_type
>= scm_numptob
)
550 if (scm_ptobs
[port_type
].free
)
551 /* Yes, I really do mean `.free' rather than `.close'. `.close'
552 is for explicit `close-port' by user. */
553 scm_ptobs
[port_type
].free (port
);
555 SCM_SETSTREAM (port
, 0);
556 SCM_CLR_PORT_OPEN_FLAG (port
);
558 scm_gc_ports_collected
++;
567 /* This function is not and should not be thread safe. */
569 scm_new_port_table_entry (scm_t_bits tag
)
570 #define FUNC_NAME "scm_new_port_table_entry"
573 We initialize the cell to empty, this is in case scm_gc_calloc
574 triggers GC ; we don't want the GC to scan a half-finished Z.
577 SCM z
= scm_cons (SCM_EOL
, SCM_EOL
);
578 scm_t_port
*entry
= (scm_t_port
*) scm_gc_calloc (sizeof (scm_t_port
), "port");
581 entry
->file_name
= SCM_BOOL_F
;
582 entry
->rw_active
= SCM_PORT_NEITHER
;
584 /* Initialize this port with the thread's current default
586 if ((enc
= scm_i_get_port_encoding (SCM_BOOL_F
)) == NULL
)
587 entry
->encoding
= NULL
;
589 entry
->encoding
= scm_gc_strdup (enc
, "port");
590 entry
->ilseq_handler
= scm_i_get_conversion_strategy (SCM_BOOL_F
);
592 SCM_SET_CELL_TYPE (z
, tag
);
593 SCM_SETPTAB_ENTRY (z
, entry
);
595 scm_hashq_set_x (scm_i_port_weak_hash
, z
, SCM_BOOL_F
);
597 /* For each new port, register a finalizer so that it port type's free
598 function can be invoked eventually. */
599 register_finalizer_for_port (z
);
605 #if SCM_ENABLE_DEPRECATED==1
607 scm_add_to_port_table (SCM port
)
609 SCM z
= scm_new_port_table_entry (scm_tc7_port
);
610 scm_t_port
* pt
= SCM_PTAB_ENTRY(z
);
613 SCM_SETCAR (z
, SCM_EOL
);
614 SCM_SETCDR (z
, SCM_EOL
);
615 SCM_SETPTAB_ENTRY (port
, pt
);
621 /* Remove a port from the table and destroy it. */
623 /* This function is not and should not be thread safe. */
625 scm_i_remove_port (SCM port
)
626 #define FUNC_NAME "scm_remove_port"
628 scm_t_port
*p
= SCM_PTAB_ENTRY (port
);
630 scm_port_non_buffer (p
);
632 p
->putback_buf
= NULL
;
633 p
->putback_buf_size
= 0;
635 SCM_SETPTAB_ENTRY (port
, 0);
636 scm_hashq_remove_x (scm_i_port_weak_hash
, port
);
641 /* Functions for debugging. */
643 SCM_DEFINE (scm_pt_size
, "pt-size", 0, 0, 0,
645 "Return the number of ports in the port table. @code{pt-size}\n"
646 "is only included in @code{--enable-guile-debug} builds.")
647 #define FUNC_NAME s_scm_pt_size
649 return scm_from_int (SCM_HASHTABLE_N_ITEMS (scm_i_port_weak_hash
));
655 scm_port_non_buffer (scm_t_port
*pt
)
657 pt
->read_pos
= pt
->read_buf
= pt
->read_end
= &pt
->shortbuf
;
658 pt
->write_buf
= pt
->write_pos
= &pt
->shortbuf
;
659 pt
->read_buf_size
= pt
->write_buf_size
= 1;
660 pt
->write_end
= pt
->write_buf
+ pt
->write_buf_size
;
664 /* Revealed counts --- an oddity inherited from SCSH. */
666 /* Find a port in the table and return its revealed count.
667 Also used by the garbage collector.
671 scm_revealed_count (SCM port
)
673 return SCM_REVEALED(port
);
678 /* Return the revealed count for a port. */
680 SCM_DEFINE (scm_port_revealed
, "port-revealed", 1, 0, 0,
682 "Return the revealed count for @var{port}.")
683 #define FUNC_NAME s_scm_port_revealed
685 port
= SCM_COERCE_OUTPORT (port
);
686 SCM_VALIDATE_OPENPORT (1, port
);
687 return scm_from_int (scm_revealed_count (port
));
691 /* Set the revealed count for a port. */
692 SCM_DEFINE (scm_set_port_revealed_x
, "set-port-revealed!", 2, 0, 0,
693 (SCM port
, SCM rcount
),
694 "Sets the revealed count for a port to a given value.\n"
695 "The return value is unspecified.")
696 #define FUNC_NAME s_scm_set_port_revealed_x
698 port
= SCM_COERCE_OUTPORT (port
);
699 SCM_VALIDATE_OPENPORT (1, port
);
700 SCM_REVEALED (port
) = scm_to_int (rcount
);
701 return SCM_UNSPECIFIED
;
707 /* Retrieving a port's mode. */
709 /* Return the flags that characterize a port based on the mode
710 * string used to open a file for that port.
712 * See PORT FLAGS in scm.h
716 scm_i_mode_bits_n (SCM modes
)
719 | (scm_i_string_contains_char (modes
, 'r')
720 || scm_i_string_contains_char (modes
, '+') ? SCM_RDNG
: 0)
721 | (scm_i_string_contains_char (modes
, 'w')
722 || scm_i_string_contains_char (modes
, 'a')
723 || scm_i_string_contains_char (modes
, '+') ? SCM_WRTNG
: 0)
724 | (scm_i_string_contains_char (modes
, '0') ? SCM_BUF0
: 0)
725 | (scm_i_string_contains_char (modes
, 'l') ? SCM_BUFLINE
: 0));
729 scm_mode_bits (char *modes
)
731 return scm_i_mode_bits (scm_from_locale_string (modes
));
735 scm_i_mode_bits (SCM modes
)
739 if (!scm_is_string (modes
))
740 scm_wrong_type_arg_msg (NULL
, 0, modes
, "string");
742 bits
= scm_i_mode_bits_n (modes
);
743 scm_remember_upto_here_1 (modes
);
747 /* Return the mode flags from an open port.
748 * Some modes such as "append" are only used when opening
749 * a file and are not returned here. */
751 SCM_DEFINE (scm_port_mode
, "port-mode", 1, 0, 0,
753 "Return the port modes associated with the open port @var{port}.\n"
754 "These will not necessarily be identical to the modes used when\n"
755 "the port was opened, since modes such as \"append\" which are\n"
756 "used only during port creation are not retained.")
757 #define FUNC_NAME s_scm_port_mode
762 port
= SCM_COERCE_OUTPORT (port
);
763 SCM_VALIDATE_OPPORT (1, port
);
764 if (SCM_CELL_WORD_0 (port
) & SCM_RDNG
) {
765 if (SCM_CELL_WORD_0 (port
) & SCM_WRTNG
)
766 strcpy (modes
, "r+");
770 else if (SCM_CELL_WORD_0 (port
) & SCM_WRTNG
)
772 if (SCM_CELL_WORD_0 (port
) & SCM_BUF0
)
774 return scm_from_locale_string (modes
);
783 * Call the close operation on a port object.
784 * see also scm_close.
786 SCM_DEFINE (scm_close_port
, "close-port", 1, 0, 0,
788 "Close the specified port object. Return @code{#t} if it\n"
789 "successfully closes a port or @code{#f} if it was already\n"
790 "closed. An exception may be raised if an error occurs, for\n"
791 "example when flushing buffered output. See also @ref{Ports and\n"
792 "File Descriptors, close}, for a procedure which can close file\n"
794 #define FUNC_NAME s_scm_close_port
799 port
= SCM_COERCE_OUTPORT (port
);
801 SCM_VALIDATE_PORT (1, port
);
802 if (SCM_CLOSEDP (port
))
804 i
= SCM_PTOBNUM (port
);
805 if (scm_ptobs
[i
].close
)
806 rv
= (scm_ptobs
[i
].close
) (port
);
809 scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex
);
810 scm_i_remove_port (port
);
811 scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex
);
812 SCM_CLR_PORT_OPEN_FLAG (port
);
813 return scm_from_bool (rv
>= 0);
817 SCM_DEFINE (scm_close_input_port
, "close-input-port", 1, 0, 0,
819 "Close the specified input port object. The routine has no effect if\n"
820 "the file has already been closed. An exception may be raised if an\n"
821 "error occurs. The value returned is unspecified.\n\n"
822 "See also @ref{Ports and File Descriptors, close}, for a procedure\n"
823 "which can close file descriptors.")
824 #define FUNC_NAME s_scm_close_input_port
826 SCM_VALIDATE_INPUT_PORT (1, port
);
827 scm_close_port (port
);
828 return SCM_UNSPECIFIED
;
832 SCM_DEFINE (scm_close_output_port
, "close-output-port", 1, 0, 0,
834 "Close the specified output port object. The routine has no effect if\n"
835 "the file has already been closed. An exception may be raised if an\n"
836 "error occurs. The value returned is unspecified.\n\n"
837 "See also @ref{Ports and File Descriptors, close}, for a procedure\n"
838 "which can close file descriptors.")
839 #define FUNC_NAME s_scm_close_output_port
841 port
= SCM_COERCE_OUTPORT (port
);
842 SCM_VALIDATE_OUTPUT_PORT (1, port
);
843 scm_close_port (port
);
844 return SCM_UNSPECIFIED
;
849 scm_i_collect_keys_in_vector (void *closure
, SCM key
, SCM value
, SCM result
)
851 int *i
= (int*) closure
;
852 scm_c_vector_set_x (result
, *i
, key
);
859 scm_c_port_for_each (void (*proc
)(void *data
, SCM p
), void *data
)
865 /* Even without pre-emptive multithreading, running arbitrary code
866 while scanning the port table is unsafe because the port table
867 can change arbitrarily (from a GC, for example). So we first
868 collect the ports into a vector. -mvo */
870 scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex
);
871 n
= SCM_HASHTABLE_N_ITEMS (scm_i_port_weak_hash
);
872 scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex
);
873 ports
= scm_c_make_vector (n
, SCM_BOOL_F
);
875 scm_i_pthread_mutex_lock (&scm_i_port_table_mutex
);
876 ports
= scm_internal_hash_fold (scm_i_collect_keys_in_vector
, &i
,
877 ports
, scm_i_port_weak_hash
);
878 scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex
);
880 for (i
= 0; i
< n
; i
++) {
881 SCM p
= SCM_SIMPLE_VECTOR_REF (ports
, i
);
886 scm_remember_upto_here_1 (ports
);
889 SCM_DEFINE (scm_port_for_each
, "port-for-each", 1, 0, 0,
891 "Apply @var{proc} to each port in the Guile port table\n"
892 "in turn. The return value is unspecified. More specifically,\n"
893 "@var{proc} is applied exactly once to every port that exists\n"
894 "in the system at the time @var{port-for-each} is invoked.\n"
895 "Changes to the port table while @var{port-for-each} is running\n"
896 "have no effect as far as @var{port-for-each} is concerned.")
897 #define FUNC_NAME s_scm_port_for_each
899 SCM_VALIDATE_PROC (1, proc
);
901 scm_c_port_for_each ((void (*)(void*,SCM
))scm_call_1
, proc
);
902 return SCM_UNSPECIFIED
;
908 /* Utter miscellany. Gosh, we should clean this up some time. */
910 SCM_DEFINE (scm_input_port_p
, "input-port?", 1, 0, 0,
912 "Return @code{#t} if @var{x} is an input port, otherwise return\n"
913 "@code{#f}. Any object satisfying this predicate also satisfies\n"
915 #define FUNC_NAME s_scm_input_port_p
917 return scm_from_bool (SCM_INPUT_PORT_P (x
));
921 SCM_DEFINE (scm_output_port_p
, "output-port?", 1, 0, 0,
923 "Return @code{#t} if @var{x} is an output port, otherwise return\n"
924 "@code{#f}. Any object satisfying this predicate also satisfies\n"
926 #define FUNC_NAME s_scm_output_port_p
928 x
= SCM_COERCE_OUTPORT (x
);
929 return scm_from_bool (SCM_OUTPUT_PORT_P (x
));
933 SCM_DEFINE (scm_port_p
, "port?", 1, 0, 0,
935 "Return a boolean indicating whether @var{x} is a port.\n"
936 "Equivalent to @code{(or (input-port? @var{x}) (output-port?\n"
938 #define FUNC_NAME s_scm_port_p
940 return scm_from_bool (SCM_PORTP (x
));
944 SCM_DEFINE (scm_port_closed_p
, "port-closed?", 1, 0, 0,
946 "Return @code{#t} if @var{port} is closed or @code{#f} if it is\n"
948 #define FUNC_NAME s_scm_port_closed_p
950 SCM_VALIDATE_PORT (1, port
);
951 return scm_from_bool (!SCM_OPPORTP (port
));
955 SCM_DEFINE (scm_eof_object_p
, "eof-object?", 1, 0, 0,
957 "Return @code{#t} if @var{x} is an end-of-file object; otherwise\n"
959 #define FUNC_NAME s_scm_eof_object_p
961 return scm_from_bool(SCM_EOF_OBJECT_P (x
));
965 SCM_DEFINE (scm_force_output
, "force-output", 0, 1, 0,
967 "Flush the specified output port, or the current output port if @var{port}\n"
968 "is omitted. The current output buffer contents are passed to the\n"
969 "underlying port implementation (e.g., in the case of fports, the\n"
970 "data will be written to the file and the output buffer will be cleared.)\n"
971 "It has no effect on an unbuffered port.\n\n"
972 "The return value is unspecified.")
973 #define FUNC_NAME s_scm_force_output
975 if (SCM_UNBNDP (port
))
976 port
= scm_current_output_port ();
979 port
= SCM_COERCE_OUTPORT (port
);
980 SCM_VALIDATE_OPOUTPORT (1, port
);
983 return SCM_UNSPECIFIED
;
989 flush_output_port (void *closure
, SCM port
)
991 if (SCM_OPOUTPORTP (port
))
995 SCM_DEFINE (scm_flush_all_ports
, "flush-all-ports", 0, 0, 0,
997 "Equivalent to calling @code{force-output} on\n"
998 "all open output ports. The return value is unspecified.")
999 #define FUNC_NAME s_scm_flush_all_ports
1001 scm_c_port_for_each (&flush_output_port
, NULL
);
1002 return SCM_UNSPECIFIED
;
1006 SCM_DEFINE (scm_read_char
, "read-char", 0, 1, 0,
1008 "Return the next character available from @var{port}, updating\n"
1009 "@var{port} to point to the following character. If no more\n"
1010 "characters are available, the end-of-file object is returned.")
1011 #define FUNC_NAME s_scm_read_char
1014 if (SCM_UNBNDP (port
))
1015 port
= scm_current_input_port ();
1016 SCM_VALIDATE_OPINPORT (1, port
);
1017 c
= scm_getc (port
);
1020 return SCM_MAKE_CHAR (c
);
1024 #define SCM_MBCHAR_BUF_SIZE (4)
1026 /* Read a codepoint from PORT and return it. Fill BUF with the byte
1027 representation of the codepoint in PORT's encoding, and set *LEN to
1028 the length in bytes of that representation. Raise an error on
1031 get_codepoint (SCM port
, char buf
[SCM_MBCHAR_BUF_SIZE
], size_t *len
)
1034 size_t bufcount
= 0;
1035 scm_t_uint32 result_buf
;
1036 scm_t_wchar codepoint
= 0;
1039 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1041 c
= scm_get_byte_or_eof (port
);
1043 return (scm_t_wchar
) EOF
;
1048 if (pt
->encoding
== NULL
)
1050 /* The encoding is Latin-1: bytes are characters. */
1051 codepoint
= (unsigned char) buf
[0];
1057 u32len
= sizeof (result_buf
) / sizeof (scm_t_uint32
);
1058 u32
= u32_conv_from_encoding (pt
->encoding
,
1059 (enum iconv_ilseq_handler
) pt
->ilseq_handler
,
1060 buf
, bufcount
, NULL
, &result_buf
, &u32len
);
1061 if (u32
== NULL
|| u32len
== 0)
1063 if (errno
== ENOMEM
)
1064 scm_memory_error ("Input decoding");
1066 /* Otherwise errno is EILSEQ or EINVAL, so perhaps more
1067 bytes are needed. Keep looping. */
1071 /* Complete codepoint found. */
1074 if (SCM_UNLIKELY (u32
!= &result_buf
))
1075 /* libunistring up to 0.9.3 (included) would always heap-allocate
1076 the result even when a large-enough RESULT_BUF is supplied, see
1077 <http://lists.gnu.org/archive/html/bug-libunistring/2010-07/msg00003.html>. */
1083 if (bufcount
== SCM_MBCHAR_BUF_SIZE
)
1085 /* We've read several bytes and didn't find a good
1086 codepoint. Give up. */
1090 c
= scm_get_byte_or_eof (port
);
1094 /* EOF before a complete character was read. Push it all
1095 back and return EOF. */
1096 while (bufcount
> 0)
1098 /* FIXME: this will probably cause errors in the port column. */
1099 scm_unget_byte (buf
[bufcount
-1], port
);
1107 /* It is always invalid to have EOL in the middle of a
1108 multibyte character. */
1109 scm_unget_byte ('\n', port
);
1113 buf
[bufcount
++] = c
;
1145 SCM err_str
= scm_i_make_string (bufcount
, &err_buf
);
1146 memcpy (err_buf
, buf
, bufcount
);
1148 if (errno
== EILSEQ
)
1149 scm_misc_error (NULL
, "input encoding error for ~s: ~s",
1150 scm_list_2 (scm_from_locale_string (scm_i_get_port_encoding (port
)),
1153 scm_misc_error (NULL
, "input encoding error (invalid) for ~s: ~s\n",
1154 scm_list_2 (scm_from_locale_string (scm_i_get_port_encoding (port
)),
1158 /* Never gets here. */
1162 /* Read a codepoint from PORT and return it. */
1167 char buf
[SCM_MBCHAR_BUF_SIZE
];
1169 return get_codepoint (port
, buf
, &len
);
1172 /* this should only be called when the read buffer is empty. it
1173 tries to refill the read buffer. it returns the first char from
1174 the port, which is either EOF or *(pt->read_pos). */
1176 scm_fill_input (SCM port
)
1178 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1180 assert (pt
->read_pos
== pt
->read_end
);
1182 if (pt
->read_buf
== pt
->putback_buf
)
1184 /* finished reading put-back chars. */
1185 pt
->read_buf
= pt
->saved_read_buf
;
1186 pt
->read_pos
= pt
->saved_read_pos
;
1187 pt
->read_end
= pt
->saved_read_end
;
1188 pt
->read_buf_size
= pt
->saved_read_buf_size
;
1189 if (pt
->read_pos
< pt
->read_end
)
1190 return *(pt
->read_pos
);
1192 return scm_ptobs
[SCM_PTOBNUM (port
)].fill_input (port
);
1198 * This function differs from scm_c_write; it updates port line and
1202 update_port_lf (scm_t_wchar c
, SCM port
)
1219 scm_lfwrite (const char *ptr
, size_t size
, SCM port
)
1221 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1222 scm_t_ptob_descriptor
*ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
1224 if (pt
->rw_active
== SCM_PORT_READ
)
1225 scm_end_input (port
);
1227 ptob
->write (port
, ptr
, size
);
1229 for (; size
; ptr
++, size
--)
1230 update_port_lf ((scm_t_wchar
) (unsigned char) *ptr
, port
);
1233 pt
->rw_active
= SCM_PORT_WRITE
;
1236 /* Write a scheme string STR to PORT from START inclusive to END
1239 scm_lfwrite_substr (SCM str
, size_t start
, size_t end
, SCM port
)
1241 size_t i
, size
= scm_i_string_length (str
);
1242 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1243 scm_t_ptob_descriptor
*ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
1248 if (pt
->rw_active
== SCM_PORT_READ
)
1249 scm_end_input (port
);
1251 if (end
== (size_t) (-1))
1255 /* Note that making a substring will likely take the
1256 stringbuf_write_mutex. So, one shouldn't use scm_lfwrite_substr
1257 if the stringbuf write mutex may still be held elsewhere. */
1258 buf
= scm_to_stringn (scm_c_substring (str
, start
, end
), &len
,
1259 pt
->encoding
, pt
->ilseq_handler
);
1260 ptob
->write (port
, buf
, len
);
1263 for (i
= 0; i
< size
; i
++)
1265 p
= scm_i_string_ref (str
, i
+ start
);
1266 update_port_lf (p
, port
);
1270 pt
->rw_active
= SCM_PORT_WRITE
;
1273 /* Write a scheme string STR to PORT. */
1275 scm_lfwrite_str (SCM str
, SCM port
)
1277 size_t i
, size
= scm_i_string_length (str
);
1278 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1279 scm_t_ptob_descriptor
*ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
1284 if (pt
->rw_active
== SCM_PORT_READ
)
1285 scm_end_input (port
);
1287 buf
= scm_to_stringn (str
, &len
,
1288 pt
->encoding
, pt
->ilseq_handler
);
1289 ptob
->write (port
, buf
, len
);
1292 for (i
= 0; i
< size
; i
++)
1294 p
= scm_i_string_ref (str
, i
);
1295 update_port_lf (p
, port
);
1299 pt
->rw_active
= SCM_PORT_WRITE
;
1304 * Used by an application to read arbitrary number of bytes from an
1305 * SCM port. Same semantics as libc read, except that scm_c_read only
1306 * returns less than SIZE bytes if at end-of-file.
1308 * Warning: Doesn't update port line and column counts! */
1310 /* This structure, and the following swap_buffer function, are used
1311 for temporarily swapping a port's own read buffer, and the buffer
1312 that the caller of scm_c_read provides. */
1313 struct port_and_swap_buffer
1316 unsigned char *buffer
;
1321 swap_buffer (void *data
)
1323 struct port_and_swap_buffer
*psb
= (struct port_and_swap_buffer
*) data
;
1324 unsigned char *old_buf
= psb
->pt
->read_buf
;
1325 size_t old_size
= psb
->pt
->read_buf_size
;
1327 /* Make the port use (buffer, size) from the struct. */
1328 psb
->pt
->read_pos
= psb
->pt
->read_buf
= psb
->pt
->read_end
= psb
->buffer
;
1329 psb
->pt
->read_buf_size
= psb
->size
;
1331 /* Save the port's old (buffer, size) in the struct. */
1332 psb
->buffer
= old_buf
;
1333 psb
->size
= old_size
;
1337 scm_c_read (SCM port
, void *buffer
, size_t size
)
1338 #define FUNC_NAME "scm_c_read"
1341 size_t n_read
= 0, n_available
;
1342 struct port_and_swap_buffer psb
;
1344 SCM_VALIDATE_OPINPORT (1, port
);
1346 pt
= SCM_PTAB_ENTRY (port
);
1347 if (pt
->rw_active
== SCM_PORT_WRITE
)
1348 scm_ptobs
[SCM_PTOBNUM (port
)].flush (port
);
1351 pt
->rw_active
= SCM_PORT_READ
;
1353 /* Take bytes first from the port's read buffer. */
1354 if (pt
->read_pos
< pt
->read_end
)
1356 n_available
= min (size
, pt
->read_end
- pt
->read_pos
);
1357 memcpy (buffer
, pt
->read_pos
, n_available
);
1358 buffer
= (char *) buffer
+ n_available
;
1359 pt
->read_pos
+= n_available
;
1360 n_read
+= n_available
;
1361 size
-= n_available
;
1364 /* Avoid the scm_dynwind_* costs if we now have enough data. */
1368 /* Now we will call scm_fill_input repeatedly until we have read the
1369 requested number of bytes. (Note that a single scm_fill_input
1370 call does not guarantee to fill the whole of the port's read
1372 if (pt
->read_buf_size
<= 1 && pt
->encoding
== NULL
)
1374 /* The port that we are reading from is unbuffered - i.e. does
1375 not have its own persistent buffer - but we have a buffer,
1376 provided by our caller, that is the right size for the data
1377 that is wanted. For the following scm_fill_input calls,
1378 therefore, we use the buffer in hand as the port's read
1381 We need to make sure that the port's normal (1 byte) buffer
1382 is reinstated in case one of the scm_fill_input () calls
1383 throws an exception; we use the scm_dynwind_* API to achieve
1386 A consequence of this optimization is that the fill_input
1387 functions can't unget characters. That'll push data to the
1388 pushback buffer instead of this psb buffer. */
1390 unsigned char *pback
= pt
->putback_buf
;
1393 psb
.buffer
= buffer
;
1395 scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE
);
1396 scm_dynwind_rewind_handler (swap_buffer
, &psb
, SCM_F_WIND_EXPLICITLY
);
1397 scm_dynwind_unwind_handler (swap_buffer
, &psb
, SCM_F_WIND_EXPLICITLY
);
1399 /* Call scm_fill_input until we have all the bytes that we need,
1401 while (pt
->read_buf_size
&& (scm_fill_input (port
) != EOF
))
1403 pt
->read_buf_size
-= (pt
->read_end
- pt
->read_pos
);
1404 pt
->read_pos
= pt
->read_buf
= pt
->read_end
;
1407 if (pback
!= pt
->putback_buf
1408 || pt
->read_buf
- (unsigned char *) buffer
< 0)
1409 scm_misc_error (FUNC_NAME
,
1410 "scm_c_read must not call a fill function that pushes "
1411 "back characters onto an unbuffered port", SCM_EOL
);
1413 n_read
+= pt
->read_buf
- (unsigned char *) buffer
;
1415 /* Reinstate the port's normal buffer. */
1420 /* The port has its own buffer. It is important that we use it,
1421 even if it happens to be smaller than our caller's buffer, so
1422 that a custom port implementation's entry points (in
1423 particular, fill_input) can rely on the buffer always being
1424 the same as they first set up. */
1425 while (size
&& (scm_fill_input (port
) != EOF
))
1427 n_available
= min (size
, pt
->read_end
- pt
->read_pos
);
1428 memcpy (buffer
, pt
->read_pos
, n_available
);
1429 buffer
= (char *) buffer
+ n_available
;
1430 pt
->read_pos
+= n_available
;
1431 n_read
+= n_available
;
1432 size
-= n_available
;
1442 * Used by an application to write arbitrary number of bytes to an SCM
1443 * port. Similar semantics as libc write. However, unlike libc
1444 * write, scm_c_write writes the requested number of bytes and has no
1447 * Warning: Doesn't update port line and column counts!
1451 scm_c_write (SCM port
, const void *ptr
, size_t size
)
1452 #define FUNC_NAME "scm_c_write"
1455 scm_t_ptob_descriptor
*ptob
;
1457 SCM_VALIDATE_OPOUTPORT (1, port
);
1459 pt
= SCM_PTAB_ENTRY (port
);
1460 ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
1462 if (pt
->rw_active
== SCM_PORT_READ
)
1463 scm_end_input (port
);
1465 ptob
->write (port
, ptr
, size
);
1468 pt
->rw_active
= SCM_PORT_WRITE
;
1473 scm_flush (SCM port
)
1475 long i
= SCM_PTOBNUM (port
);
1477 (scm_ptobs
[i
].flush
) (port
);
1481 scm_end_input (SCM port
)
1484 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1486 if (pt
->read_buf
== pt
->putback_buf
)
1488 offset
= pt
->read_end
- pt
->read_pos
;
1489 pt
->read_buf
= pt
->saved_read_buf
;
1490 pt
->read_pos
= pt
->saved_read_pos
;
1491 pt
->read_end
= pt
->saved_read_end
;
1492 pt
->read_buf_size
= pt
->saved_read_buf_size
;
1497 scm_ptobs
[SCM_PTOBNUM (port
)].end_input (port
, offset
);
1504 scm_unget_byte (int c
, SCM port
)
1505 #define FUNC_NAME "scm_unget_byte"
1507 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1509 if (pt
->read_buf
== pt
->putback_buf
)
1510 /* already using the put-back buffer. */
1512 /* enlarge putback_buf if necessary. */
1513 if (pt
->read_end
== pt
->read_buf
+ pt
->read_buf_size
1514 && pt
->read_buf
== pt
->read_pos
)
1516 size_t new_size
= pt
->read_buf_size
* 2;
1517 unsigned char *tmp
= (unsigned char *)
1518 scm_gc_realloc (pt
->putback_buf
, pt
->read_buf_size
, new_size
,
1521 pt
->read_pos
= pt
->read_buf
= pt
->putback_buf
= tmp
;
1522 pt
->read_end
= pt
->read_buf
+ pt
->read_buf_size
;
1523 pt
->read_buf_size
= pt
->putback_buf_size
= new_size
;
1526 /* shift any existing bytes to buffer + 1. */
1527 if (pt
->read_pos
== pt
->read_end
)
1528 pt
->read_end
= pt
->read_buf
+ 1;
1529 else if (pt
->read_pos
!= pt
->read_buf
+ 1)
1531 int count
= pt
->read_end
- pt
->read_pos
;
1533 memmove (pt
->read_buf
+ 1, pt
->read_pos
, count
);
1534 pt
->read_end
= pt
->read_buf
+ 1 + count
;
1537 pt
->read_pos
= pt
->read_buf
;
1540 /* switch to the put-back buffer. */
1542 if (pt
->putback_buf
== NULL
)
1545 = (unsigned char *) scm_gc_malloc_pointerless
1546 (SCM_INITIAL_PUTBACK_BUF_SIZE
, "putback buffer");
1547 pt
->putback_buf_size
= SCM_INITIAL_PUTBACK_BUF_SIZE
;
1550 pt
->saved_read_buf
= pt
->read_buf
;
1551 pt
->saved_read_pos
= pt
->read_pos
;
1552 pt
->saved_read_end
= pt
->read_end
;
1553 pt
->saved_read_buf_size
= pt
->read_buf_size
;
1555 pt
->read_pos
= pt
->read_buf
= pt
->putback_buf
;
1556 pt
->read_end
= pt
->read_buf
+ 1;
1557 pt
->read_buf_size
= pt
->putback_buf_size
;
1563 pt
->rw_active
= SCM_PORT_READ
;
1568 scm_ungetc (scm_t_wchar c
, SCM port
)
1569 #define FUNC_NAME "scm_ungetc"
1571 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1573 char result_buf
[10];
1574 const char *encoding
;
1578 if (pt
->encoding
!= NULL
)
1579 encoding
= pt
->encoding
;
1581 encoding
= "ISO-8859-1";
1583 len
= sizeof (result_buf
);
1584 result
= u32_conv_to_encoding (encoding
,
1585 (enum iconv_ilseq_handler
) pt
->ilseq_handler
,
1586 (uint32_t *) &c
, 1, NULL
,
1589 if (SCM_UNLIKELY (result
== NULL
|| len
== 0))
1593 chr
= scm_integer_to_char (scm_from_uint32 (c
));
1594 scm_encoding_error (FUNC_NAME
, errno
,
1595 "conversion to port encoding failed",
1597 scm_string (scm_list_1 (chr
)));
1600 for (i
= len
- 1; i
>= 0; i
--)
1601 scm_unget_byte (result
[i
], port
);
1603 if (SCM_UNLIKELY (result
!= result_buf
))
1608 /* What should col be in this case?
1609 * We'll leave it at -1.
1611 SCM_LINUM (port
) -= 1;
1620 scm_ungets (const char *s
, int n
, SCM port
)
1622 /* This is simple minded and inefficient, but unreading strings is
1623 * probably not a common operation, and remember that line and
1624 * column numbers have to be handled...
1626 * Please feel free to write an optimized version!
1629 scm_ungetc (s
[n
], port
);
1633 SCM_DEFINE (scm_peek_char
, "peek-char", 0, 1, 0,
1635 "Return the next character available from @var{port},\n"
1636 "@emph{without} updating @var{port} to point to the following\n"
1637 "character. If no more characters are available, the\n"
1638 "end-of-file object is returned.\n"
1640 "The value returned by\n"
1641 "a call to @code{peek-char} is the same as the value that would\n"
1642 "have been returned by a call to @code{read-char} on the same\n"
1643 "port. The only difference is that the very next call to\n"
1644 "@code{read-char} or @code{peek-char} on that @var{port} will\n"
1645 "return the value returned by the preceding call to\n"
1646 "@code{peek-char}. In particular, a call to @code{peek-char} on\n"
1647 "an interactive port will hang waiting for input whenever a call\n"
1648 "to @code{read-char} would have hung.")
1649 #define FUNC_NAME s_scm_peek_char
1653 char bytes
[SCM_MBCHAR_BUF_SIZE
];
1657 if (SCM_UNBNDP (port
))
1658 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 ();
1699 SCM_VALIDATE_OPINPORT (2, port
);
1701 c
= SCM_CHAR (cobj
);
1703 scm_ungetc (c
, port
);
1708 SCM_DEFINE (scm_unread_string
, "unread-string", 2, 0, 0,
1709 (SCM str
, SCM port
),
1710 "Place the string @var{str} in @var{port} so that its characters will be\n"
1711 "read in subsequent read operations. If called multiple times, the\n"
1712 "unread characters will be read again in last-in first-out order. If\n"
1713 "@var{port} is not supplied, the current-input-port is used.")
1714 #define FUNC_NAME s_scm_unread_string
1717 SCM_VALIDATE_STRING (1, str
);
1718 if (SCM_UNBNDP (port
))
1719 port
= scm_current_input_port ();
1721 SCM_VALIDATE_OPINPORT (2, port
);
1723 n
= scm_i_string_length (str
);
1726 scm_ungetc (scm_i_string_ref (str
, n
), port
);
1732 SCM_DEFINE (scm_seek
, "seek", 3, 0, 0,
1733 (SCM fd_port
, SCM offset
, SCM whence
),
1734 "Sets the current position of @var{fd/port} to the integer\n"
1735 "@var{offset}, which is interpreted according to the value of\n"
1738 "One of the following variables should be supplied for\n"
1740 "@defvar SEEK_SET\n"
1741 "Seek from the beginning of the file.\n"
1743 "@defvar SEEK_CUR\n"
1744 "Seek from the current position.\n"
1746 "@defvar SEEK_END\n"
1747 "Seek from the end of the file.\n"
1749 "If @var{fd/port} is a file descriptor, the underlying system\n"
1750 "call is @code{lseek}. @var{port} may be a string port.\n"
1752 "The value returned is the new position in the file. This means\n"
1753 "that the current position of a port can be obtained using:\n"
1755 "(seek port 0 SEEK_CUR)\n"
1757 #define FUNC_NAME s_scm_seek
1761 fd_port
= SCM_COERCE_OUTPORT (fd_port
);
1763 how
= scm_to_int (whence
);
1764 if (how
!= SEEK_SET
&& how
!= SEEK_CUR
&& how
!= SEEK_END
)
1765 SCM_OUT_OF_RANGE (3, whence
);
1767 if (SCM_OPPORTP (fd_port
))
1769 scm_t_ptob_descriptor
*ptob
= scm_ptobs
+ SCM_PTOBNUM (fd_port
);
1770 off_t_or_off64_t off
= scm_to_off_t_or_off64_t (offset
);
1771 off_t_or_off64_t rv
;
1774 SCM_MISC_ERROR ("port is not seekable",
1775 scm_cons (fd_port
, SCM_EOL
));
1777 rv
= ptob
->seek (fd_port
, off
, how
);
1778 return scm_from_off_t_or_off64_t (rv
);
1780 else /* file descriptor?. */
1782 off_t_or_off64_t off
= scm_to_off_t_or_off64_t (offset
);
1783 off_t_or_off64_t rv
;
1784 rv
= lseek_or_lseek64 (scm_to_int (fd_port
), off
, how
);
1787 return scm_from_off_t_or_off64_t (rv
);
1796 /* Mingw has ftruncate(), perhaps implemented above using chsize, but
1797 doesn't have the filename version truncate(), hence this code. */
1798 #if HAVE_FTRUNCATE && ! HAVE_TRUNCATE
1800 truncate (const char *file
, off_t length
)
1804 fdes
= open (file
, O_BINARY
| O_WRONLY
);
1808 ret
= ftruncate (fdes
, length
);
1811 int save_errno
= errno
;
1817 return close (fdes
);
1819 #endif /* HAVE_FTRUNCATE && ! HAVE_TRUNCATE */
1821 SCM_DEFINE (scm_truncate_file
, "truncate-file", 1, 1, 0,
1822 (SCM object
, SCM length
),
1823 "Truncate @var{file} to @var{length} bytes. @var{file} can be a\n"
1824 "filename string, a port object, or an integer file descriptor.\n"
1825 "The return value is unspecified.\n"
1827 "For a port or file descriptor @var{length} can be omitted, in\n"
1828 "which case the file is truncated at the current position (per\n"
1829 "@code{ftell} above).\n"
1831 "On most systems a file can be extended by giving a length\n"
1832 "greater than the current size, but this is not mandatory in the\n"
1834 #define FUNC_NAME s_scm_truncate_file
1838 /* "object" can be a port, fdes or filename.
1840 Negative "length" makes no sense, but it's left to truncate() or
1841 ftruncate() to give back an error for that (normally EINVAL).
1844 if (SCM_UNBNDP (length
))
1846 /* must supply length if object is a filename. */
1847 if (scm_is_string (object
))
1848 SCM_MISC_ERROR("must supply length if OBJECT is a filename", SCM_EOL
);
1850 length
= scm_seek (object
, SCM_INUM0
, scm_from_int (SEEK_CUR
));
1853 object
= SCM_COERCE_OUTPORT (object
);
1854 if (scm_is_integer (object
))
1856 off_t_or_off64_t c_length
= scm_to_off_t_or_off64_t (length
);
1857 SCM_SYSCALL (rv
= ftruncate_or_ftruncate64 (scm_to_int (object
),
1860 else if (SCM_OPOUTPORTP (object
))
1862 off_t_or_off64_t c_length
= scm_to_off_t_or_off64_t (length
);
1863 scm_t_port
*pt
= SCM_PTAB_ENTRY (object
);
1864 scm_t_ptob_descriptor
*ptob
= scm_ptobs
+ SCM_PTOBNUM (object
);
1866 if (!ptob
->truncate
)
1867 SCM_MISC_ERROR ("port is not truncatable", SCM_EOL
);
1868 if (pt
->rw_active
== SCM_PORT_READ
)
1869 scm_end_input (object
);
1870 else if (pt
->rw_active
== SCM_PORT_WRITE
)
1871 ptob
->flush (object
);
1873 ptob
->truncate (object
, c_length
);
1878 off_t_or_off64_t c_length
= scm_to_off_t_or_off64_t (length
);
1879 char *str
= scm_to_locale_string (object
);
1881 SCM_SYSCALL (rv
= truncate_or_truncate64 (str
, c_length
));
1888 return SCM_UNSPECIFIED
;
1892 SCM_DEFINE (scm_port_line
, "port-line", 1, 0, 0,
1894 "Return the current line number for @var{port}.\n"
1896 "The first line of a file is 0. But you might want to add 1\n"
1897 "when printing line numbers, since starting from 1 is\n"
1898 "traditional in error messages, and likely to be more natural to\n"
1900 #define FUNC_NAME s_scm_port_line
1902 port
= SCM_COERCE_OUTPORT (port
);
1903 SCM_VALIDATE_OPENPORT (1, port
);
1904 return scm_from_long (SCM_LINUM (port
));
1908 SCM_DEFINE (scm_set_port_line_x
, "set-port-line!", 2, 0, 0,
1909 (SCM port
, SCM line
),
1910 "Set the current line number for @var{port} to @var{line}. The\n"
1911 "first line of a file is 0.")
1912 #define FUNC_NAME s_scm_set_port_line_x
1914 port
= SCM_COERCE_OUTPORT (port
);
1915 SCM_VALIDATE_OPENPORT (1, port
);
1916 SCM_PTAB_ENTRY (port
)->line_number
= scm_to_long (line
);
1917 return SCM_UNSPECIFIED
;
1921 SCM_DEFINE (scm_port_column
, "port-column", 1, 0, 0,
1923 "Return the current column number of @var{port}.\n"
1924 "If the number is\n"
1925 "unknown, the result is #f. Otherwise, the result is a 0-origin integer\n"
1926 "- i.e. the first character of the first line is line 0, column 0.\n"
1927 "(However, when you display a file position, for example in an error\n"
1928 "message, we recommend you add 1 to get 1-origin integers. This is\n"
1929 "because lines and column numbers traditionally start with 1, and that is\n"
1930 "what non-programmers will find most natural.)")
1931 #define FUNC_NAME s_scm_port_column
1933 port
= SCM_COERCE_OUTPORT (port
);
1934 SCM_VALIDATE_OPENPORT (1, port
);
1935 return scm_from_int (SCM_COL (port
));
1939 SCM_DEFINE (scm_set_port_column_x
, "set-port-column!", 2, 0, 0,
1940 (SCM port
, SCM column
),
1941 "Set the current column of @var{port}. Before reading the first\n"
1942 "character on a line the column should be 0.")
1943 #define FUNC_NAME s_scm_set_port_column_x
1945 port
= SCM_COERCE_OUTPORT (port
);
1946 SCM_VALIDATE_OPENPORT (1, port
);
1947 SCM_PTAB_ENTRY (port
)->column_number
= scm_to_int (column
);
1948 return SCM_UNSPECIFIED
;
1952 SCM_DEFINE (scm_port_filename
, "port-filename", 1, 0, 0,
1954 "Return the filename associated with @var{port}. This function returns\n"
1955 "the strings \"standard input\", \"standard output\" and \"standard error\"\n"
1956 "when called on the current input, output and error ports respectively.")
1957 #define FUNC_NAME s_scm_port_filename
1959 port
= SCM_COERCE_OUTPORT (port
);
1960 SCM_VALIDATE_OPENPORT (1, port
);
1961 return SCM_FILENAME (port
);
1965 SCM_DEFINE (scm_set_port_filename_x
, "set-port-filename!", 2, 0, 0,
1966 (SCM port
, SCM filename
),
1967 "Change the filename associated with @var{port}, using the current input\n"
1968 "port if none is specified. Note that this does not change the port's\n"
1969 "source of data, but only the value that is returned by\n"
1970 "@code{port-filename} and reported in diagnostic output.")
1971 #define FUNC_NAME s_scm_set_port_filename_x
1973 port
= SCM_COERCE_OUTPORT (port
);
1974 SCM_VALIDATE_OPENPORT (1, port
);
1975 /* We allow the user to set the filename to whatever he likes. */
1976 SCM_SET_FILENAME (port
, filename
);
1977 return SCM_UNSPECIFIED
;
1981 /* A fluid specifying the default encoding for newly created ports. If it is
1982 a string, that is the encoding. If it is #f, it is in the "native"
1983 (Latin-1) encoding. */
1984 SCM_VARIABLE (default_port_encoding_var
, "%default-port-encoding");
1986 static int scm_port_encoding_init
= 0;
1988 /* Return a C string representation of the current encoding. */
1990 scm_i_get_port_encoding (SCM port
)
1994 if (scm_is_false (port
))
1996 if (!scm_port_encoding_init
)
1998 else if (!scm_is_fluid (SCM_VARIABLE_REF (default_port_encoding_var
)))
2002 encoding
= scm_fluid_ref (SCM_VARIABLE_REF (default_port_encoding_var
));
2003 if (!scm_is_string (encoding
))
2006 return scm_i_string_chars (encoding
);
2012 pt
= SCM_PTAB_ENTRY (port
);
2014 return pt
->encoding
;
2020 /* Returns ENC if it is a recognized encoding. If it isn't, it tries
2021 to find an alias of ENC that is valid. Otherwise, it returns
2024 find_valid_encoding (const char *enc
)
2027 const char str
[] = " ";
2028 scm_t_uint32 result_buf
;
2032 u32len
= sizeof (result_buf
) / sizeof (scm_t_uint32
);
2033 u32
= u32_conv_from_encoding (enc
, iconveh_error
, str
, 1,
2034 NULL
, &result_buf
, &u32len
);
2035 isvalid
= (u32
!= NULL
);
2037 if (SCM_UNLIKELY (u32
!= &result_buf
))
2047 scm_i_set_port_encoding_x (SCM port
, const char *enc
)
2049 const char *valid_enc
;
2052 /* Null is shorthand for the native, Latin-1 encoding. */
2057 valid_enc
= find_valid_encoding (enc
);
2058 if (valid_enc
== NULL
)
2061 err
= scm_from_locale_string (enc
);
2062 scm_misc_error (NULL
, "invalid or unknown character encoding ~s",
2067 if (scm_is_false (port
))
2069 /* Set the default encoding for future ports. */
2070 if (!scm_port_encoding_init
2071 || !scm_is_fluid (SCM_VARIABLE_REF (default_port_encoding_var
)))
2072 scm_misc_error (NULL
, "tried to set port encoding fluid before it is initialized",
2075 if (valid_enc
== NULL
2076 || !strcmp (valid_enc
, "ASCII")
2077 || !strcmp (valid_enc
, "ANSI_X3.4-1968")
2078 || !strcmp (valid_enc
, "ISO-8859-1"))
2079 scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var
), SCM_BOOL_F
);
2081 scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var
),
2082 scm_from_locale_string (valid_enc
));
2086 /* Set the character encoding for this port. */
2087 pt
= SCM_PTAB_ENTRY (port
);
2088 if (valid_enc
== NULL
)
2089 pt
->encoding
= NULL
;
2091 pt
->encoding
= scm_gc_strdup (valid_enc
, "port");
2095 SCM_DEFINE (scm_port_encoding
, "port-encoding", 1, 0, 0,
2097 "Returns, as a string, the character encoding that @var{port}\n"
2098 "uses to interpret its input and output.\n")
2099 #define FUNC_NAME s_scm_port_encoding
2104 SCM_VALIDATE_PORT (1, port
);
2106 pt
= SCM_PTAB_ENTRY (port
);
2107 enc
= scm_i_get_port_encoding (port
);
2109 return scm_from_locale_string (pt
->encoding
);
2115 SCM_DEFINE (scm_set_port_encoding_x
, "set-port-encoding!", 2, 0, 0,
2116 (SCM port
, SCM enc
),
2117 "Sets the character encoding that will be used to interpret all\n"
2118 "port I/O. New ports are created with the encoding\n"
2119 "appropriate for the current locale if @code{setlocale} has \n"
2120 "been called or ISO-8859-1 otherwise\n"
2121 "and this procedure can be used to modify that encoding.\n")
2122 #define FUNC_NAME s_scm_set_port_encoding_x
2125 const char *valid_enc_str
;
2127 SCM_VALIDATE_PORT (1, port
);
2128 SCM_VALIDATE_STRING (2, enc
);
2130 enc_str
= scm_to_locale_string (enc
);
2131 valid_enc_str
= find_valid_encoding (enc_str
);
2132 if (valid_enc_str
== NULL
)
2135 scm_misc_error (FUNC_NAME
, "invalid or unknown character encoding ~s",
2140 scm_i_set_port_encoding_x (port
, valid_enc_str
);
2143 return SCM_UNSPECIFIED
;
2148 /* This determines how conversions handle unconvertible characters. */
2149 SCM_GLOBAL_VARIABLE (scm_conversion_strategy
, "%port-conversion-strategy");
2150 static int scm_conversion_strategy_init
= 0;
2152 scm_t_string_failed_conversion_handler
2153 scm_i_get_conversion_strategy (SCM port
)
2157 if (scm_is_false (port
))
2159 if (!scm_conversion_strategy_init
2160 || !scm_is_fluid (SCM_VARIABLE_REF (scm_conversion_strategy
)))
2161 return SCM_FAILED_CONVERSION_QUESTION_MARK
;
2164 encoding
= scm_fluid_ref (SCM_VARIABLE_REF (scm_conversion_strategy
));
2165 if (scm_is_false (encoding
))
2166 return SCM_FAILED_CONVERSION_QUESTION_MARK
;
2168 return (scm_t_string_failed_conversion_handler
) scm_to_int (encoding
);
2174 pt
= SCM_PTAB_ENTRY (port
);
2175 return pt
->ilseq_handler
;
2181 scm_i_set_conversion_strategy_x (SCM port
,
2182 scm_t_string_failed_conversion_handler handler
)
2187 strategy
= scm_from_int ((int) handler
);
2189 if (scm_is_false (port
))
2191 /* Set the default encoding for future ports. */
2192 if (!scm_conversion_strategy
2193 || !scm_is_fluid (SCM_VARIABLE_REF (scm_conversion_strategy
)))
2194 scm_misc_error (NULL
, "tried to set conversion strategy fluid before it is initialized",
2196 scm_fluid_set_x (SCM_VARIABLE_REF (scm_conversion_strategy
), strategy
);
2200 /* Set the character encoding for this port. */
2201 pt
= SCM_PTAB_ENTRY (port
);
2202 pt
->ilseq_handler
= handler
;
2206 SCM_DEFINE (scm_port_conversion_strategy
, "port-conversion-strategy",
2207 1, 0, 0, (SCM port
),
2208 "Returns the behavior of the port when handling a character that\n"
2209 "is not representable in the port's current encoding.\n"
2210 "It returns the symbol @code{error} if unrepresentable characters\n"
2211 "should cause exceptions, @code{substitute} if the port should\n"
2212 "try to replace unrepresentable characters with question marks or\n"
2213 "approximate characters, or @code{escape} if unrepresentable\n"
2214 "characters should be converted to string escapes.\n"
2216 "If @var{port} is @code{#f}, then the current default behavior\n"
2217 "will be returned. New ports will have this default behavior\n"
2218 "when they are created.\n")
2219 #define FUNC_NAME s_scm_port_conversion_strategy
2221 scm_t_string_failed_conversion_handler h
;
2223 SCM_VALIDATE_OPPORT (1, port
);
2225 if (!scm_is_false (port
))
2227 SCM_VALIDATE_OPPORT (1, port
);
2230 h
= scm_i_get_conversion_strategy (port
);
2231 if (h
== SCM_FAILED_CONVERSION_ERROR
)
2232 return scm_from_locale_symbol ("error");
2233 else if (h
== SCM_FAILED_CONVERSION_QUESTION_MARK
)
2234 return scm_from_locale_symbol ("substitute");
2235 else if (h
== SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE
)
2236 return scm_from_locale_symbol ("escape");
2240 /* Never gets here. */
2241 return SCM_UNDEFINED
;
2245 SCM_DEFINE (scm_set_port_conversion_strategy_x
, "set-port-conversion-strategy!",
2247 (SCM port
, SCM sym
),
2248 "Sets the behavior of the interpreter when outputting a character\n"
2249 "that is not representable in the port's current encoding.\n"
2250 "@var{sym} can be either @code{'error}, @code{'substitute}, or\n"
2251 "@code{'escape}. If it is @code{'error}, an error will be thrown\n"
2252 "when an unconvertible character is encountered. If it is\n"
2253 "@code{'substitute}, then unconvertible characters will \n"
2254 "be replaced with approximate characters, or with question marks\n"
2255 "if no approximately correct character is available.\n"
2256 "If it is @code{'escape},\n"
2257 "it will appear as a hex escape when output.\n"
2259 "If @var{port} is an open port, the conversion error behavior\n"
2260 "is set for that port. If it is @code{#f}, it is set as the\n"
2261 "default behavior for any future ports that get created in\n"
2263 #define FUNC_NAME s_scm_set_port_conversion_strategy_x
2269 if (!scm_is_false (port
))
2271 SCM_VALIDATE_OPPORT (1, port
);
2274 err
= scm_from_locale_symbol ("error");
2275 if (scm_is_true (scm_eqv_p (sym
, err
)))
2277 scm_i_set_conversion_strategy_x (port
, SCM_FAILED_CONVERSION_ERROR
);
2278 return SCM_UNSPECIFIED
;
2281 qm
= scm_from_locale_symbol ("substitute");
2282 if (scm_is_true (scm_eqv_p (sym
, qm
)))
2284 scm_i_set_conversion_strategy_x (port
,
2285 SCM_FAILED_CONVERSION_QUESTION_MARK
);
2286 return SCM_UNSPECIFIED
;
2289 esc
= scm_from_locale_symbol ("escape");
2290 if (scm_is_true (scm_eqv_p (sym
, esc
)))
2292 scm_i_set_conversion_strategy_x (port
,
2293 SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE
);
2294 return SCM_UNSPECIFIED
;
2297 SCM_MISC_ERROR ("unknown conversion behavior ~s", scm_list_1 (sym
));
2299 return SCM_UNSPECIFIED
;
2306 scm_print_port_mode (SCM exp
, SCM port
)
2308 scm_puts (SCM_CLOSEDP (exp
)
2310 : (SCM_RDNG
& SCM_CELL_WORD_0 (exp
)
2311 ? (SCM_WRTNG
& SCM_CELL_WORD_0 (exp
)
2314 : (SCM_WRTNG
& SCM_CELL_WORD_0 (exp
)
2321 scm_port_print (SCM exp
, SCM port
, scm_print_state
*pstate SCM_UNUSED
)
2323 char *type
= SCM_PTOBNAME (SCM_PTOBNUM (exp
));
2326 scm_puts ("#<", port
);
2327 scm_print_port_mode (exp
, port
);
2328 scm_puts (type
, port
);
2329 scm_putc (' ', port
);
2330 scm_uintprint (SCM_CELL_WORD_1 (exp
), 16, port
);
2331 scm_putc ('>', port
);
2339 scm_t_bits scm_tc16_void_port
= 0;
2341 static int fill_input_void_port (SCM port SCM_UNUSED
)
2347 write_void_port (SCM port SCM_UNUSED
,
2348 const void *data SCM_UNUSED
,
2349 size_t size SCM_UNUSED
)
2354 scm_i_void_port (long mode_bits
)
2356 scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex
);
2358 SCM answer
= scm_new_port_table_entry (scm_tc16_void_port
);
2359 scm_t_port
* pt
= SCM_PTAB_ENTRY(answer
);
2361 scm_port_non_buffer (pt
);
2363 SCM_SETSTREAM (answer
, 0);
2364 SCM_SET_CELL_TYPE (answer
, scm_tc16_void_port
| mode_bits
);
2365 scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex
);
2371 scm_void_port (char *mode_str
)
2373 return scm_i_void_port (scm_mode_bits (mode_str
));
2376 SCM_DEFINE (scm_sys_make_void_port
, "%make-void-port", 1, 0, 0,
2378 "Create and return a new void port. A void port acts like\n"
2379 "@file{/dev/null}. The @var{mode} argument\n"
2380 "specifies the input/output modes for this port: see the\n"
2381 "documentation for @code{open-file} in @ref{File Ports}.")
2382 #define FUNC_NAME s_scm_sys_make_void_port
2384 return scm_i_void_port (scm_i_mode_bits (mode
));
2389 /* Initialization. */
2394 /* lseek() symbols. */
2395 scm_c_define ("SEEK_SET", scm_from_int (SEEK_SET
));
2396 scm_c_define ("SEEK_CUR", scm_from_int (SEEK_CUR
));
2397 scm_c_define ("SEEK_END", scm_from_int (SEEK_END
));
2399 scm_tc16_void_port
= scm_make_port_type ("void", fill_input_void_port
,
2402 cur_inport_fluid
= scm_make_fluid ();
2403 cur_outport_fluid
= scm_make_fluid ();
2404 cur_errport_fluid
= scm_make_fluid ();
2405 cur_loadport_fluid
= scm_make_fluid ();
2407 scm_i_port_weak_hash
= scm_make_weak_key_hash_table (SCM_I_MAKINUM(31));
2409 #include "libguile/ports.x"
2411 /* Use Latin-1 as the default port encoding. */
2412 SCM_VARIABLE_SET (default_port_encoding_var
, scm_make_fluid ());
2413 scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var
), SCM_BOOL_F
);
2414 scm_port_encoding_init
= 1;
2416 SCM_VARIABLE_SET (scm_conversion_strategy
, scm_make_fluid ());
2417 scm_fluid_set_x (SCM_VARIABLE_REF (scm_conversion_strategy
),
2418 scm_from_int ((int) SCM_FAILED_CONVERSION_QUESTION_MARK
));
2419 scm_conversion_strategy_init
= 1;