1 /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2003, 2004, 2006, 2007, 2008, 2009 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 */
34 #include "libguile/_scm.h"
35 #include "libguile/async.h"
36 #include "libguile/eval.h"
37 #include "libguile/fports.h" /* direct access for seek and truncate */
38 #include "libguile/objects.h"
39 #include "libguile/goops.h"
40 #include "libguile/smob.h"
41 #include "libguile/chars.h"
42 #include "libguile/dynwind.h"
44 #include "libguile/keywords.h"
45 #include "libguile/hashtab.h"
46 #include "libguile/root.h"
47 #include "libguile/strings.h"
48 #include "libguile/mallocs.h"
49 #include "libguile/validate.h"
50 #include "libguile/ports.h"
51 #include "libguile/vectors.h"
52 #include "libguile/weaks.h"
53 #include "libguile/fluids.h"
71 #ifdef HAVE_SYS_IOCTL_H
72 #include <sys/ioctl.h>
75 /* Mingw (version 3.4.5, circa 2006) has ftruncate as an alias for chsize
76 already, but have this code here in case that wasn't so in past versions,
77 or perhaps to help other minimal DOS environments.
79 gnulib ftruncate.c has code using fcntl F_CHSIZE and F_FREESP, which
80 might be possibilities if we've got other systems without ftruncate. */
82 #if HAVE_CHSIZE && ! HAVE_FTRUNCATE
83 #define ftruncate(fd, size) chsize (fd, size)
85 #define HAVE_FTRUNCATE 1
89 /* The port kind table --- a dynamically resized array of port types. */
92 /* scm_ptobs scm_numptob
93 * implement a dynamically resized array of ptob records.
94 * Indexes into this table are used when generating type
95 * tags for smobjects (if you know a tag you can get an index and conversely).
97 scm_t_ptob_descriptor
*scm_ptobs
;
100 /* GC marker for a port with stream of SCM type. */
102 scm_markstream (SCM ptr
)
105 openp
= SCM_CELL_WORD_0 (ptr
) & SCM_OPN
;
107 return SCM_PACK (SCM_STREAM (ptr
));
113 * We choose to use an interface similar to the smob interface with
114 * fill_input and write as standard fields, passed to the port
115 * type constructor, and optional fields set by setters.
119 flush_port_default (SCM port SCM_UNUSED
)
124 end_input_default (SCM port SCM_UNUSED
, int offset SCM_UNUSED
)
129 scm_port_free0 (SCM port
)
135 scm_make_port_type (char *name
,
136 int (*fill_input
) (SCM port
),
137 void (*write
) (SCM port
, const void *data
, size_t size
))
140 if (SCM_I_MAX_PORT_TYPE_COUNT
- 1 <= scm_numptob
)
142 SCM_CRITICAL_SECTION_START
;
143 SCM_SYSCALL (tmp
= (char *) realloc ((char *) scm_ptobs
,
145 * 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
= scm_port_free0
;
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 ();
268 SCM_VALIDATE_OPINPORT (1, port
);
270 pt
= SCM_PTAB_ENTRY (port
);
272 /* if the current read buffer is filled, or the
273 last pushed-back char has been read and the saved buffer is
274 filled, result is true. */
275 if (pt
->read_pos
< pt
->read_end
276 || (pt
->read_buf
== pt
->putback_buf
277 && pt
->saved_read_pos
< pt
->saved_read_end
))
281 scm_t_ptob_descriptor
*ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
283 if (ptob
->input_waiting
)
284 return scm_from_bool(ptob
->input_waiting (port
));
291 /* move up to read_len chars from port's putback and/or read buffers
292 into memory starting at dest. returns the number of chars moved. */
293 size_t scm_take_from_input_buffers (SCM port
, char *dest
, size_t read_len
)
295 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
296 size_t chars_read
= 0;
297 size_t from_buf
= min (pt
->read_end
- pt
->read_pos
, read_len
);
301 memcpy (dest
, pt
->read_pos
, from_buf
);
302 pt
->read_pos
+= from_buf
;
303 chars_read
+= from_buf
;
304 read_len
-= from_buf
;
308 /* if putback was active, try the real input buffer too. */
309 if (pt
->read_buf
== pt
->putback_buf
)
311 from_buf
= min (pt
->saved_read_end
- pt
->saved_read_pos
, read_len
);
314 memcpy (dest
, pt
->saved_read_pos
, from_buf
);
315 pt
->saved_read_pos
+= from_buf
;
316 chars_read
+= from_buf
;
322 /* Clear a port's read buffers, returning the contents. */
323 SCM_DEFINE (scm_drain_input
, "drain-input", 1, 0, 0,
325 "This procedure clears a port's input buffers, similar\n"
326 "to the way that force-output clears the output buffer. The\n"
327 "contents of the buffers are returned as a single string, e.g.,\n"
330 "(define p (open-input-file ...))\n"
331 "(drain-input p) => empty string, nothing buffered yet.\n"
332 "(unread-char (read-char p) p)\n"
333 "(drain-input p) => initial chars from p, up to the buffer size.\n"
335 "Draining the buffers may be useful for cleanly finishing\n"
336 "buffered I/O so that the file descriptor can be used directly\n"
337 "for further input.")
338 #define FUNC_NAME s_scm_drain_input
345 SCM_VALIDATE_OPINPORT (1, port
);
346 pt
= SCM_PTAB_ENTRY (port
);
348 count
= pt
->read_end
- pt
->read_pos
;
349 if (pt
->read_buf
== pt
->putback_buf
)
350 count
+= pt
->saved_read_end
- pt
->saved_read_pos
;
352 result
= scm_i_make_string (count
, &data
);
353 scm_take_from_input_buffers (port
, data
, count
);
359 /* Standard ports --- current input, output, error, and more(!). */
361 static SCM cur_inport_fluid
;
362 static SCM cur_outport_fluid
;
363 static SCM cur_errport_fluid
;
364 static SCM cur_loadport_fluid
;
366 SCM_DEFINE (scm_current_input_port
, "current-input-port", 0, 0, 0,
368 "Return the current input port. This is the default port used\n"
369 "by many input procedures. Initially, @code{current-input-port}\n"
370 "returns the @dfn{standard input} in Unix and C terminology.")
371 #define FUNC_NAME s_scm_current_input_port
373 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 return scm_fluid_ref (cur_outport_fluid
);
389 SCM_DEFINE (scm_current_error_port
, "current-error-port", 0, 0, 0,
391 "Return the port to which errors and warnings should be sent (the\n"
392 "@dfn{standard error} in Unix and C terminology).")
393 #define FUNC_NAME s_scm_current_error_port
395 return scm_fluid_ref (cur_errport_fluid
);
399 SCM_DEFINE (scm_current_load_port
, "current-load-port", 0, 0, 0,
401 "Return the current-load-port.\n"
402 "The load port is used internally by @code{primitive-load}.")
403 #define FUNC_NAME s_scm_current_load_port
405 return scm_fluid_ref (cur_loadport_fluid
);
409 SCM_DEFINE (scm_set_current_input_port
, "set-current-input-port", 1, 0, 0,
411 "@deffnx {Scheme Procedure} set-current-output-port port\n"
412 "@deffnx {Scheme Procedure} set-current-error-port port\n"
413 "Change the ports returned by @code{current-input-port},\n"
414 "@code{current-output-port} and @code{current-error-port}, respectively,\n"
415 "so that they use the supplied @var{port} for input or output.")
416 #define FUNC_NAME s_scm_set_current_input_port
418 SCM oinp
= scm_fluid_ref (cur_inport_fluid
);
419 SCM_VALIDATE_OPINPORT (1, port
);
420 scm_fluid_set_x (cur_inport_fluid
, port
);
426 SCM_DEFINE (scm_set_current_output_port
, "set-current-output-port", 1, 0, 0,
428 "Set the current default output port to @var{port}.")
429 #define FUNC_NAME s_scm_set_current_output_port
431 SCM ooutp
= scm_fluid_ref (cur_outport_fluid
);
432 port
= SCM_COERCE_OUTPORT (port
);
433 SCM_VALIDATE_OPOUTPORT (1, port
);
434 scm_fluid_set_x (cur_outport_fluid
, port
);
440 SCM_DEFINE (scm_set_current_error_port
, "set-current-error-port", 1, 0, 0,
442 "Set the current default error port to @var{port}.")
443 #define FUNC_NAME s_scm_set_current_error_port
445 SCM oerrp
= scm_fluid_ref (cur_errport_fluid
);
446 port
= SCM_COERCE_OUTPORT (port
);
447 SCM_VALIDATE_OPOUTPORT (1, port
);
448 scm_fluid_set_x (cur_errport_fluid
, port
);
454 scm_dynwind_current_input_port (SCM port
)
455 #define FUNC_NAME NULL
457 SCM_VALIDATE_OPINPORT (1, port
);
458 scm_dynwind_fluid (cur_inport_fluid
, port
);
463 scm_dynwind_current_output_port (SCM port
)
464 #define FUNC_NAME NULL
466 port
= SCM_COERCE_OUTPORT (port
);
467 SCM_VALIDATE_OPOUTPORT (1, port
);
468 scm_dynwind_fluid (cur_outport_fluid
, port
);
473 scm_dynwind_current_error_port (SCM port
)
474 #define FUNC_NAME NULL
476 port
= SCM_COERCE_OUTPORT (port
);
477 SCM_VALIDATE_OPOUTPORT (1, port
);
478 scm_dynwind_fluid (cur_errport_fluid
, port
);
483 scm_i_dynwind_current_load_port (SCM port
)
485 scm_dynwind_fluid (cur_loadport_fluid
, port
);
489 /* The port table --- an array of pointers to ports. */
492 We need a global registry of ports to flush them all at exit, and to
493 get all the ports matching a file descriptor.
495 SCM scm_i_port_weak_hash
;
497 scm_i_pthread_mutex_t scm_i_port_table_mutex
= SCM_I_PTHREAD_MUTEX_INITIALIZER
;
499 /* This function is not and should not be thread safe. */
502 scm_new_port_table_entry (scm_t_bits tag
)
503 #define FUNC_NAME "scm_new_port_table_entry"
506 We initialize the cell to empty, this is in case scm_gc_calloc
507 triggers GC ; we don't want the GC to scan a half-finished Z.
510 SCM z
= scm_cons (SCM_EOL
, SCM_EOL
);
511 scm_t_port
*entry
= (scm_t_port
*) scm_gc_calloc (sizeof (scm_t_port
), "port");
513 entry
->file_name
= SCM_BOOL_F
;
514 entry
->rw_active
= SCM_PORT_NEITHER
;
517 SCM_SET_CELL_TYPE (z
, tag
);
518 SCM_SETPTAB_ENTRY (z
, entry
);
520 scm_hashq_set_x (scm_i_port_weak_hash
, z
, SCM_BOOL_F
);
526 #if SCM_ENABLE_DEPRECATED==1
528 scm_add_to_port_table (SCM port
)
530 SCM z
= scm_new_port_table_entry (scm_tc7_port
);
531 scm_t_port
* pt
= SCM_PTAB_ENTRY(z
);
534 SCM_SETCAR (z
, SCM_EOL
);
535 SCM_SETCDR (z
, SCM_EOL
);
536 SCM_SETPTAB_ENTRY (port
, pt
);
542 /* Remove a port from the table and destroy it. */
544 /* This function is not and should not be thread safe. */
546 scm_i_remove_port (SCM port
)
547 #define FUNC_NAME "scm_remove_port"
549 scm_t_port
*p
= SCM_PTAB_ENTRY (port
);
551 scm_gc_free (p
->putback_buf
, p
->putback_buf_size
, "putback buffer");
552 scm_gc_free (p
, sizeof (scm_t_port
), "port");
554 SCM_SETPTAB_ENTRY (port
, 0);
555 scm_hashq_remove_x (scm_i_port_weak_hash
, port
);
560 /* Functions for debugging. */
562 SCM_DEFINE (scm_pt_size
, "pt-size", 0, 0, 0,
564 "Return the number of ports in the port table. @code{pt-size}\n"
565 "is only included in @code{--enable-guile-debug} builds.")
566 #define FUNC_NAME s_scm_pt_size
568 return scm_from_int (SCM_HASHTABLE_N_ITEMS (scm_i_port_weak_hash
));
574 scm_port_non_buffer (scm_t_port
*pt
)
576 pt
->read_pos
= pt
->read_buf
= pt
->read_end
= &pt
->shortbuf
;
577 pt
->write_buf
= pt
->write_pos
= &pt
->shortbuf
;
578 pt
->read_buf_size
= pt
->write_buf_size
= 1;
579 pt
->write_end
= pt
->write_buf
+ pt
->write_buf_size
;
583 /* Revealed counts --- an oddity inherited from SCSH. */
585 /* Find a port in the table and return its revealed count.
586 Also used by the garbage collector.
590 scm_revealed_count (SCM port
)
592 return SCM_REVEALED(port
);
597 /* Return the revealed count for a port. */
599 SCM_DEFINE (scm_port_revealed
, "port-revealed", 1, 0, 0,
601 "Return the revealed count for @var{port}.")
602 #define FUNC_NAME s_scm_port_revealed
604 port
= SCM_COERCE_OUTPORT (port
);
605 SCM_VALIDATE_OPENPORT (1, port
);
606 return scm_from_int (scm_revealed_count (port
));
610 /* Set the revealed count for a port. */
611 SCM_DEFINE (scm_set_port_revealed_x
, "set-port-revealed!", 2, 0, 0,
612 (SCM port
, SCM rcount
),
613 "Sets the revealed count for a port to a given value.\n"
614 "The return value is unspecified.")
615 #define FUNC_NAME s_scm_set_port_revealed_x
617 port
= SCM_COERCE_OUTPORT (port
);
618 SCM_VALIDATE_OPENPORT (1, port
);
619 SCM_REVEALED (port
) = scm_to_int (rcount
);
620 return SCM_UNSPECIFIED
;
626 /* Retrieving a port's mode. */
628 /* Return the flags that characterize a port based on the mode
629 * string used to open a file for that port.
631 * See PORT FLAGS in scm.h
635 scm_i_mode_bits_n (const char *modes
, size_t n
)
638 | (memchr (modes
, 'r', n
) || memchr (modes
, '+', n
) ? SCM_RDNG
: 0)
639 | ( memchr (modes
, 'w', n
)
640 || memchr (modes
, 'a', n
)
641 || memchr (modes
, '+', n
) ? SCM_WRTNG
: 0)
642 | (memchr (modes
, '0', n
) ? SCM_BUF0
: 0)
643 | (memchr (modes
, 'l', n
) ? SCM_BUFLINE
: 0));
647 scm_mode_bits (char *modes
)
649 return scm_i_mode_bits_n (modes
, strlen (modes
));
653 scm_i_mode_bits (SCM modes
)
657 if (!scm_is_string (modes
))
658 scm_wrong_type_arg_msg (NULL
, 0, modes
, "string");
660 bits
= scm_i_mode_bits_n (scm_i_string_chars (modes
),
661 scm_i_string_length (modes
));
662 scm_remember_upto_here_1 (modes
);
666 /* Return the mode flags from an open port.
667 * Some modes such as "append" are only used when opening
668 * a file and are not returned here. */
670 SCM_DEFINE (scm_port_mode
, "port-mode", 1, 0, 0,
672 "Return the port modes associated with the open port @var{port}.\n"
673 "These will not necessarily be identical to the modes used when\n"
674 "the port was opened, since modes such as \"append\" which are\n"
675 "used only during port creation are not retained.")
676 #define FUNC_NAME s_scm_port_mode
681 port
= SCM_COERCE_OUTPORT (port
);
682 SCM_VALIDATE_OPPORT (1, port
);
683 if (SCM_CELL_WORD_0 (port
) & SCM_RDNG
) {
684 if (SCM_CELL_WORD_0 (port
) & SCM_WRTNG
)
685 strcpy (modes
, "r+");
689 else if (SCM_CELL_WORD_0 (port
) & SCM_WRTNG
)
691 if (SCM_CELL_WORD_0 (port
) & SCM_BUF0
)
693 return scm_from_locale_string (modes
);
702 * Call the close operation on a port object.
703 * see also scm_close.
705 SCM_DEFINE (scm_close_port
, "close-port", 1, 0, 0,
707 "Close the specified port object. Return @code{#t} if it\n"
708 "successfully closes a port or @code{#f} if it was already\n"
709 "closed. An exception may be raised if an error occurs, for\n"
710 "example when flushing buffered output. See also @ref{Ports and\n"
711 "File Descriptors, close}, for a procedure which can close file\n"
713 #define FUNC_NAME s_scm_close_port
718 port
= SCM_COERCE_OUTPORT (port
);
720 SCM_VALIDATE_PORT (1, port
);
721 if (SCM_CLOSEDP (port
))
723 i
= SCM_PTOBNUM (port
);
724 if (scm_ptobs
[i
].close
)
725 rv
= (scm_ptobs
[i
].close
) (port
);
728 scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex
);
729 scm_i_remove_port (port
);
730 scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex
);
731 SCM_CLR_PORT_OPEN_FLAG (port
);
732 return scm_from_bool (rv
>= 0);
736 SCM_DEFINE (scm_close_input_port
, "close-input-port", 1, 0, 0,
738 "Close the specified input port object. The routine has no effect if\n"
739 "the file has already been closed. An exception may be raised if an\n"
740 "error occurs. The value returned is unspecified.\n\n"
741 "See also @ref{Ports and File Descriptors, close}, for a procedure\n"
742 "which can close file descriptors.")
743 #define FUNC_NAME s_scm_close_input_port
745 SCM_VALIDATE_INPUT_PORT (1, port
);
746 scm_close_port (port
);
747 return SCM_UNSPECIFIED
;
751 SCM_DEFINE (scm_close_output_port
, "close-output-port", 1, 0, 0,
753 "Close the specified output port object. The routine has no effect if\n"
754 "the file has already been closed. An exception may be raised if an\n"
755 "error occurs. The value returned is unspecified.\n\n"
756 "See also @ref{Ports and File Descriptors, close}, for a procedure\n"
757 "which can close file descriptors.")
758 #define FUNC_NAME s_scm_close_output_port
760 port
= SCM_COERCE_OUTPORT (port
);
761 SCM_VALIDATE_OUTPUT_PORT (1, port
);
762 scm_close_port (port
);
763 return SCM_UNSPECIFIED
;
768 scm_i_collect_keys_in_vector (void *closure
, SCM key
, SCM value
, SCM result
)
770 int *i
= (int*) closure
;
771 scm_c_vector_set_x (result
, *i
, key
);
778 scm_c_port_for_each (void (*proc
)(void *data
, SCM p
), void *data
)
784 /* Even without pre-emptive multithreading, running arbitrary code
785 while scanning the port table is unsafe because the port table
786 can change arbitrarily (from a GC, for example). So we first
787 collect the ports into a vector. -mvo */
789 scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex
);
790 n
= SCM_HASHTABLE_N_ITEMS (scm_i_port_weak_hash
);
791 scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex
);
792 ports
= scm_c_make_vector (n
, SCM_BOOL_F
);
794 scm_i_pthread_mutex_lock (&scm_i_port_table_mutex
);
795 ports
= scm_internal_hash_fold (scm_i_collect_keys_in_vector
, &i
,
796 ports
, scm_i_port_weak_hash
);
797 scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex
);
799 for (i
= 0; i
< n
; i
++) {
800 SCM p
= SCM_SIMPLE_VECTOR_REF (ports
, i
);
805 scm_remember_upto_here_1 (ports
);
808 SCM_DEFINE (scm_port_for_each
, "port-for-each", 1, 0, 0,
810 "Apply @var{proc} to each port in the Guile port table\n"
811 "in turn. The return value is unspecified. More specifically,\n"
812 "@var{proc} is applied exactly once to every port that exists\n"
813 "in the system at the time @var{port-for-each} is invoked.\n"
814 "Changes to the port table while @var{port-for-each} is running\n"
815 "have no effect as far as @var{port-for-each} is concerned.")
816 #define FUNC_NAME s_scm_port_for_each
818 SCM_VALIDATE_PROC (1, proc
);
820 scm_c_port_for_each ((void (*)(void*,SCM
))scm_call_1
, proc
);
821 return SCM_UNSPECIFIED
;
827 /* Utter miscellany. Gosh, we should clean this up some time. */
829 SCM_DEFINE (scm_input_port_p
, "input-port?", 1, 0, 0,
831 "Return @code{#t} if @var{x} is an input port, otherwise return\n"
832 "@code{#f}. Any object satisfying this predicate also satisfies\n"
834 #define FUNC_NAME s_scm_input_port_p
836 return scm_from_bool (SCM_INPUT_PORT_P (x
));
840 SCM_DEFINE (scm_output_port_p
, "output-port?", 1, 0, 0,
842 "Return @code{#t} if @var{x} is an output port, otherwise return\n"
843 "@code{#f}. Any object satisfying this predicate also satisfies\n"
845 #define FUNC_NAME s_scm_output_port_p
847 x
= SCM_COERCE_OUTPORT (x
);
848 return scm_from_bool (SCM_OUTPUT_PORT_P (x
));
852 SCM_DEFINE (scm_port_p
, "port?", 1, 0, 0,
854 "Return a boolean indicating whether @var{x} is a port.\n"
855 "Equivalent to @code{(or (input-port? @var{x}) (output-port?\n"
857 #define FUNC_NAME s_scm_port_p
859 return scm_from_bool (SCM_PORTP (x
));
863 SCM_DEFINE (scm_port_closed_p
, "port-closed?", 1, 0, 0,
865 "Return @code{#t} if @var{port} is closed or @code{#f} if it is\n"
867 #define FUNC_NAME s_scm_port_closed_p
869 SCM_VALIDATE_PORT (1, port
);
870 return scm_from_bool (!SCM_OPPORTP (port
));
874 SCM_DEFINE (scm_eof_object_p
, "eof-object?", 1, 0, 0,
876 "Return @code{#t} if @var{x} is an end-of-file object; otherwise\n"
878 #define FUNC_NAME s_scm_eof_object_p
880 return scm_from_bool(SCM_EOF_OBJECT_P (x
));
884 SCM_DEFINE (scm_force_output
, "force-output", 0, 1, 0,
886 "Flush the specified output port, or the current output port if @var{port}\n"
887 "is omitted. The current output buffer contents are passed to the\n"
888 "underlying port implementation (e.g., in the case of fports, the\n"
889 "data will be written to the file and the output buffer will be cleared.)\n"
890 "It has no effect on an unbuffered port.\n\n"
891 "The return value is unspecified.")
892 #define FUNC_NAME s_scm_force_output
894 if (SCM_UNBNDP (port
))
895 port
= scm_current_output_port ();
898 port
= SCM_COERCE_OUTPORT (port
);
899 SCM_VALIDATE_OPOUTPORT (1, port
);
902 return SCM_UNSPECIFIED
;
908 flush_output_port (void *closure
, SCM port
)
910 if (SCM_OPOUTPORTP (port
))
914 SCM_DEFINE (scm_flush_all_ports
, "flush-all-ports", 0, 0, 0,
916 "Equivalent to calling @code{force-output} on\n"
917 "all open output ports. The return value is unspecified.")
918 #define FUNC_NAME s_scm_flush_all_ports
920 scm_c_port_for_each (&flush_output_port
, NULL
);
921 return SCM_UNSPECIFIED
;
925 SCM_DEFINE (scm_read_char
, "read-char", 0, 1, 0,
927 "Return the next character available from @var{port}, updating\n"
928 "@var{port} to point to the following character. If no more\n"
929 "characters are available, the end-of-file object is returned.")
930 #define FUNC_NAME s_scm_read_char
933 if (SCM_UNBNDP (port
))
934 port
= scm_current_input_port ();
935 SCM_VALIDATE_OPINPORT (1, port
);
939 return SCM_MAKE_CHAR (c
);
943 /* this should only be called when the read buffer is empty. it
944 tries to refill the read buffer. it returns the first char from
945 the port, which is either EOF or *(pt->read_pos). */
947 scm_fill_input (SCM port
)
949 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
951 assert (pt
->read_pos
== pt
->read_end
);
953 if (pt
->read_buf
== pt
->putback_buf
)
955 /* finished reading put-back chars. */
956 pt
->read_buf
= pt
->saved_read_buf
;
957 pt
->read_pos
= pt
->saved_read_pos
;
958 pt
->read_end
= pt
->saved_read_end
;
959 pt
->read_buf_size
= pt
->saved_read_buf_size
;
960 if (pt
->read_pos
< pt
->read_end
)
961 return *(pt
->read_pos
);
963 return scm_ptobs
[SCM_PTOBNUM (port
)].fill_input (port
);
969 * This function differs from scm_c_write; it updates port line and
973 update_port_lf (scm_t_wchar c
, SCM port
)
990 scm_lfwrite (const char *ptr
, size_t size
, SCM port
)
992 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
993 scm_t_ptob_descriptor
*ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
995 if (pt
->rw_active
== SCM_PORT_READ
)
996 scm_end_input (port
);
998 ptob
->write (port
, ptr
, size
);
1000 for (; size
; ptr
++, size
--)
1001 update_port_lf ((scm_t_wchar
) (unsigned char) *ptr
, port
);
1004 pt
->rw_active
= SCM_PORT_WRITE
;
1007 /* Write a scheme string STR to PORT from START inclusive to END
1010 scm_lfwrite_substr (SCM str
, size_t start
, size_t end
, SCM port
)
1012 size_t i
, size
= scm_i_string_length (str
);
1013 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1014 scm_t_ptob_descriptor
*ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
1019 if (pt
->rw_active
== SCM_PORT_READ
)
1020 scm_end_input (port
);
1022 if (end
== (size_t) (-1))
1026 /* Note that making a substring will likely take the
1027 stringbuf_write_mutex. So, one shouldn't use scm_lfwrite_substr
1028 if the stringbuf write mutex may still be held elsewhere. */
1029 buf
= scm_to_stringn (scm_c_substring (str
, start
, end
), &len
,
1030 NULL
, SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE
);
1031 ptob
->write (port
, buf
, len
);
1034 for (i
= 0; i
< size
; i
++)
1036 p
= scm_i_string_ref (str
, i
+ start
);
1037 update_port_lf (p
, port
);
1041 pt
->rw_active
= SCM_PORT_WRITE
;
1044 /* Write a scheme string STR to PORT. */
1046 scm_lfwrite_str (SCM str
, SCM port
)
1048 size_t i
, size
= scm_i_string_length (str
);
1049 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1050 scm_t_ptob_descriptor
*ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
1055 if (pt
->rw_active
== SCM_PORT_READ
)
1056 scm_end_input (port
);
1058 buf
= scm_to_stringn (str
, &len
,
1059 NULL
, SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE
);
1060 ptob
->write (port
, buf
, len
);
1063 for (i
= 0; i
< size
; i
++)
1065 p
= scm_i_string_ref (str
, i
);
1066 update_port_lf (p
, port
);
1070 pt
->rw_active
= SCM_PORT_WRITE
;
1075 * Used by an application to read arbitrary number of bytes from an
1076 * SCM port. Same semantics as libc read, except that scm_c_read only
1077 * returns less than SIZE bytes if at end-of-file.
1079 * Warning: Doesn't update port line and column counts! */
1081 /* This structure, and the following swap_buffer function, are used
1082 for temporarily swapping a port's own read buffer, and the buffer
1083 that the caller of scm_c_read provides. */
1084 struct port_and_swap_buffer
1087 unsigned char *buffer
;
1092 swap_buffer (void *data
)
1094 struct port_and_swap_buffer
*psb
= (struct port_and_swap_buffer
*) data
;
1095 unsigned char *old_buf
= psb
->pt
->read_buf
;
1096 size_t old_size
= psb
->pt
->read_buf_size
;
1098 /* Make the port use (buffer, size) from the struct. */
1099 psb
->pt
->read_pos
= psb
->pt
->read_buf
= psb
->pt
->read_end
= psb
->buffer
;
1100 psb
->pt
->read_buf_size
= psb
->size
;
1102 /* Save the port's old (buffer, size) in the struct. */
1103 psb
->buffer
= old_buf
;
1104 psb
->size
= old_size
;
1108 scm_c_read (SCM port
, void *buffer
, size_t size
)
1109 #define FUNC_NAME "scm_c_read"
1112 size_t n_read
= 0, n_available
;
1113 struct port_and_swap_buffer psb
;
1115 SCM_VALIDATE_OPINPORT (1, port
);
1117 pt
= SCM_PTAB_ENTRY (port
);
1118 if (pt
->rw_active
== SCM_PORT_WRITE
)
1119 scm_ptobs
[SCM_PTOBNUM (port
)].flush (port
);
1122 pt
->rw_active
= SCM_PORT_READ
;
1124 /* Take bytes first from the port's read buffer. */
1125 if (pt
->read_pos
< pt
->read_end
)
1127 n_available
= min (size
, pt
->read_end
- pt
->read_pos
);
1128 memcpy (buffer
, pt
->read_pos
, n_available
);
1129 buffer
= (char *) buffer
+ n_available
;
1130 pt
->read_pos
+= n_available
;
1131 n_read
+= n_available
;
1132 size
-= n_available
;
1135 /* Avoid the scm_dynwind_* costs if we now have enough data. */
1139 /* Now we will call scm_fill_input repeatedly until we have read the
1140 requested number of bytes. (Note that a single scm_fill_input
1141 call does not guarantee to fill the whole of the port's read
1143 if (pt
->read_buf_size
<= 1)
1145 /* The port that we are reading from is unbuffered - i.e. does
1146 not have its own persistent buffer - but we have a buffer,
1147 provided by our caller, that is the right size for the data
1148 that is wanted. For the following scm_fill_input calls,
1149 therefore, we use the buffer in hand as the port's read
1152 We need to make sure that the port's normal (1 byte) buffer
1153 is reinstated in case one of the scm_fill_input () calls
1154 throws an exception; we use the scm_dynwind_* API to achieve
1157 psb
.buffer
= buffer
;
1159 scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE
);
1160 scm_dynwind_rewind_handler (swap_buffer
, &psb
, SCM_F_WIND_EXPLICITLY
);
1161 scm_dynwind_unwind_handler (swap_buffer
, &psb
, SCM_F_WIND_EXPLICITLY
);
1163 /* Call scm_fill_input until we have all the bytes that we need,
1165 while (pt
->read_buf_size
&& (scm_fill_input (port
) != EOF
))
1167 pt
->read_buf_size
-= (pt
->read_end
- pt
->read_pos
);
1168 pt
->read_pos
= pt
->read_buf
= pt
->read_end
;
1170 n_read
+= pt
->read_buf
- (unsigned char *) buffer
;
1172 /* Reinstate the port's normal buffer. */
1177 /* The port has its own buffer. It is important that we use it,
1178 even if it happens to be smaller than our caller's buffer, so
1179 that a custom port implementation's entry points (in
1180 particular, fill_input) can rely on the buffer always being
1181 the same as they first set up. */
1182 while (size
&& (scm_fill_input (port
) != EOF
))
1184 n_available
= min (size
, pt
->read_end
- pt
->read_pos
);
1185 memcpy (buffer
, pt
->read_pos
, n_available
);
1186 buffer
= (char *) buffer
+ n_available
;
1187 pt
->read_pos
+= n_available
;
1188 n_read
+= n_available
;
1189 size
-= n_available
;
1199 * Used by an application to write arbitrary number of bytes to an SCM
1200 * port. Similar semantics as libc write. However, unlike libc
1201 * write, scm_c_write writes the requested number of bytes and has no
1204 * Warning: Doesn't update port line and column counts!
1208 scm_c_write (SCM port
, const void *ptr
, size_t size
)
1209 #define FUNC_NAME "scm_c_write"
1212 scm_t_ptob_descriptor
*ptob
;
1214 SCM_VALIDATE_OPOUTPORT (1, port
);
1216 pt
= SCM_PTAB_ENTRY (port
);
1217 ptob
= &scm_ptobs
[SCM_PTOBNUM (port
)];
1219 if (pt
->rw_active
== SCM_PORT_READ
)
1220 scm_end_input (port
);
1222 ptob
->write (port
, ptr
, size
);
1225 pt
->rw_active
= SCM_PORT_WRITE
;
1230 scm_flush (SCM port
)
1232 long i
= SCM_PTOBNUM (port
);
1233 (scm_ptobs
[i
].flush
) (port
);
1237 scm_end_input (SCM port
)
1240 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1242 if (pt
->read_buf
== pt
->putback_buf
)
1244 offset
= pt
->read_end
- pt
->read_pos
;
1245 pt
->read_buf
= pt
->saved_read_buf
;
1246 pt
->read_pos
= pt
->saved_read_pos
;
1247 pt
->read_end
= pt
->saved_read_end
;
1248 pt
->read_buf_size
= pt
->saved_read_buf_size
;
1253 scm_ptobs
[SCM_PTOBNUM (port
)].end_input (port
, offset
);
1260 scm_ungetc (int c
, SCM port
)
1261 #define FUNC_NAME "scm_ungetc"
1263 scm_t_port
*pt
= SCM_PTAB_ENTRY (port
);
1265 if (pt
->read_buf
== pt
->putback_buf
)
1266 /* already using the put-back buffer. */
1268 /* enlarge putback_buf if necessary. */
1269 if (pt
->read_end
== pt
->read_buf
+ pt
->read_buf_size
1270 && pt
->read_buf
== pt
->read_pos
)
1272 size_t new_size
= pt
->read_buf_size
* 2;
1273 unsigned char *tmp
= (unsigned char *)
1274 scm_gc_realloc (pt
->putback_buf
, pt
->read_buf_size
, new_size
,
1277 pt
->read_pos
= pt
->read_buf
= pt
->putback_buf
= tmp
;
1278 pt
->read_end
= pt
->read_buf
+ pt
->read_buf_size
;
1279 pt
->read_buf_size
= pt
->putback_buf_size
= new_size
;
1282 /* shift any existing bytes to buffer + 1. */
1283 if (pt
->read_pos
== pt
->read_end
)
1284 pt
->read_end
= pt
->read_buf
+ 1;
1285 else if (pt
->read_pos
!= pt
->read_buf
+ 1)
1287 int count
= pt
->read_end
- pt
->read_pos
;
1289 memmove (pt
->read_buf
+ 1, pt
->read_pos
, count
);
1290 pt
->read_end
= pt
->read_buf
+ 1 + count
;
1293 pt
->read_pos
= pt
->read_buf
;
1296 /* switch to the put-back buffer. */
1298 if (pt
->putback_buf
== NULL
)
1301 = (unsigned char *) scm_gc_malloc (SCM_INITIAL_PUTBACK_BUF_SIZE
,
1303 pt
->putback_buf_size
= SCM_INITIAL_PUTBACK_BUF_SIZE
;
1306 pt
->saved_read_buf
= pt
->read_buf
;
1307 pt
->saved_read_pos
= pt
->read_pos
;
1308 pt
->saved_read_end
= pt
->read_end
;
1309 pt
->saved_read_buf_size
= pt
->read_buf_size
;
1311 pt
->read_pos
= pt
->read_buf
= pt
->putback_buf
;
1312 pt
->read_end
= pt
->read_buf
+ 1;
1313 pt
->read_buf_size
= pt
->putback_buf_size
;
1319 pt
->rw_active
= SCM_PORT_READ
;
1323 /* What should col be in this case?
1324 * We'll leave it at -1.
1326 SCM_LINUM (port
) -= 1;
1335 scm_ungets (const char *s
, int n
, SCM port
)
1337 /* This is simple minded and inefficient, but unreading strings is
1338 * probably not a common operation, and remember that line and
1339 * column numbers have to be handled...
1341 * Please feel free to write an optimized version!
1344 scm_ungetc (s
[n
], port
);
1348 SCM_DEFINE (scm_peek_char
, "peek-char", 0, 1, 0,
1350 "Return the next character available from @var{port},\n"
1351 "@emph{without} updating @var{port} to point to the following\n"
1352 "character. If no more characters are available, the\n"
1353 "end-of-file object is returned.\n"
1355 "The value returned by\n"
1356 "a call to @code{peek-char} is the same as the value that would\n"
1357 "have been returned by a call to @code{read-char} on the same\n"
1358 "port. The only difference is that the very next call to\n"
1359 "@code{read-char} or @code{peek-char} on that @var{port} will\n"
1360 "return the value returned by the preceding call to\n"
1361 "@code{peek-char}. In particular, a call to @code{peek-char} on\n"
1362 "an interactive port will hang waiting for input whenever a call\n"
1363 "to @code{read-char} would have hung.")
1364 #define FUNC_NAME s_scm_peek_char
1367 if (SCM_UNBNDP (port
))
1368 port
= scm_current_input_port ();
1370 SCM_VALIDATE_OPINPORT (1, port
);
1371 column
= SCM_COL(port
);
1372 c
= scm_getc (port
);
1375 scm_ungetc (c
, port
);
1376 SCM_COL(port
) = column
;
1377 return SCM_MAKE_CHAR (c
);
1381 SCM_DEFINE (scm_unread_char
, "unread-char", 1, 1, 0,
1382 (SCM cobj
, SCM port
),
1383 "Place @var{char} in @var{port} so that it will be read by the\n"
1384 "next read operation. If called multiple times, the unread characters\n"
1385 "will be read again in last-in first-out order. If @var{port} is\n"
1386 "not supplied, the current input port is used.")
1387 #define FUNC_NAME s_scm_unread_char
1391 SCM_VALIDATE_CHAR (1, cobj
);
1392 if (SCM_UNBNDP (port
))
1393 port
= scm_current_input_port ();
1395 SCM_VALIDATE_OPINPORT (2, port
);
1397 c
= SCM_CHAR (cobj
);
1399 scm_ungetc (c
, port
);
1404 SCM_DEFINE (scm_unread_string
, "unread-string", 2, 0, 0,
1405 (SCM str
, SCM port
),
1406 "Place the string @var{str} in @var{port} so that its characters will be\n"
1407 "read in subsequent read operations. If called multiple times, the\n"
1408 "unread characters will be read again in last-in first-out order. If\n"
1409 "@var{port} is not supplied, the current-input-port is used.")
1410 #define FUNC_NAME s_scm_unread_string
1412 SCM_VALIDATE_STRING (1, str
);
1413 if (SCM_UNBNDP (port
))
1414 port
= scm_current_input_port ();
1416 SCM_VALIDATE_OPINPORT (2, port
);
1418 scm_ungets (scm_i_string_chars (str
), scm_i_string_length (str
), port
);
1424 SCM_DEFINE (scm_seek
, "seek", 3, 0, 0,
1425 (SCM fd_port
, SCM offset
, SCM whence
),
1426 "Sets the current position of @var{fd/port} to the integer\n"
1427 "@var{offset}, which is interpreted according to the value of\n"
1430 "One of the following variables should be supplied for\n"
1432 "@defvar SEEK_SET\n"
1433 "Seek from the beginning of the file.\n"
1435 "@defvar SEEK_CUR\n"
1436 "Seek from the current position.\n"
1438 "@defvar SEEK_END\n"
1439 "Seek from the end of the file.\n"
1441 "If @var{fd/port} is a file descriptor, the underlying system\n"
1442 "call is @code{lseek}. @var{port} may be a string port.\n"
1444 "The value returned is the new position in the file. This means\n"
1445 "that the current position of a port can be obtained using:\n"
1447 "(seek port 0 SEEK_CUR)\n"
1449 #define FUNC_NAME s_scm_seek
1453 fd_port
= SCM_COERCE_OUTPORT (fd_port
);
1455 how
= scm_to_int (whence
);
1456 if (how
!= SEEK_SET
&& how
!= SEEK_CUR
&& how
!= SEEK_END
)
1457 SCM_OUT_OF_RANGE (3, whence
);
1459 if (SCM_OPPORTP (fd_port
))
1461 scm_t_ptob_descriptor
*ptob
= scm_ptobs
+ SCM_PTOBNUM (fd_port
);
1462 off_t_or_off64_t off
= scm_to_off_t_or_off64_t (offset
);
1463 off_t_or_off64_t rv
;
1466 SCM_MISC_ERROR ("port is not seekable",
1467 scm_cons (fd_port
, SCM_EOL
));
1469 rv
= ptob
->seek (fd_port
, off
, how
);
1470 return scm_from_off_t_or_off64_t (rv
);
1472 else /* file descriptor?. */
1474 off_t_or_off64_t off
= scm_to_off_t_or_off64_t (offset
);
1475 off_t_or_off64_t rv
;
1476 rv
= lseek_or_lseek64 (scm_to_int (fd_port
), off
, how
);
1479 return scm_from_off_t_or_off64_t (rv
);
1488 /* Mingw has ftruncate(), perhaps implemented above using chsize, but
1489 doesn't have the filename version truncate(), hence this code. */
1490 #if HAVE_FTRUNCATE && ! HAVE_TRUNCATE
1492 truncate (const char *file
, off_t length
)
1496 fdes
= open (file
, O_BINARY
| O_WRONLY
);
1500 ret
= ftruncate (fdes
, length
);
1503 int save_errno
= errno
;
1509 return close (fdes
);
1511 #endif /* HAVE_FTRUNCATE && ! HAVE_TRUNCATE */
1513 SCM_DEFINE (scm_truncate_file
, "truncate-file", 1, 1, 0,
1514 (SCM object
, SCM length
),
1515 "Truncate @var{file} to @var{length} bytes. @var{file} can be a\n"
1516 "filename string, a port object, or an integer file descriptor.\n"
1517 "The return value is unspecified.\n"
1519 "For a port or file descriptor @var{length} can be omitted, in\n"
1520 "which case the file is truncated at the current position (per\n"
1521 "@code{ftell} above).\n"
1523 "On most systems a file can be extended by giving a length\n"
1524 "greater than the current size, but this is not mandatory in the\n"
1526 #define FUNC_NAME s_scm_truncate_file
1530 /* "object" can be a port, fdes or filename.
1532 Negative "length" makes no sense, but it's left to truncate() or
1533 ftruncate() to give back an error for that (normally EINVAL).
1536 if (SCM_UNBNDP (length
))
1538 /* must supply length if object is a filename. */
1539 if (scm_is_string (object
))
1540 SCM_MISC_ERROR("must supply length if OBJECT is a filename", SCM_EOL
);
1542 length
= scm_seek (object
, SCM_INUM0
, scm_from_int (SEEK_CUR
));
1545 object
= SCM_COERCE_OUTPORT (object
);
1546 if (scm_is_integer (object
))
1548 off_t_or_off64_t c_length
= scm_to_off_t_or_off64_t (length
);
1549 SCM_SYSCALL (rv
= ftruncate_or_ftruncate64 (scm_to_int (object
),
1552 else if (SCM_OPOUTPORTP (object
))
1554 off_t_or_off64_t c_length
= scm_to_off_t_or_off64_t (length
);
1555 scm_t_port
*pt
= SCM_PTAB_ENTRY (object
);
1556 scm_t_ptob_descriptor
*ptob
= scm_ptobs
+ SCM_PTOBNUM (object
);
1558 if (!ptob
->truncate
)
1559 SCM_MISC_ERROR ("port is not truncatable", SCM_EOL
);
1560 if (pt
->rw_active
== SCM_PORT_READ
)
1561 scm_end_input (object
);
1562 else if (pt
->rw_active
== SCM_PORT_WRITE
)
1563 ptob
->flush (object
);
1565 ptob
->truncate (object
, c_length
);
1570 off_t_or_off64_t c_length
= scm_to_off_t_or_off64_t (length
);
1571 char *str
= scm_to_locale_string (object
);
1573 SCM_SYSCALL (rv
= truncate_or_truncate64 (str
, c_length
));
1580 return SCM_UNSPECIFIED
;
1584 SCM_DEFINE (scm_port_line
, "port-line", 1, 0, 0,
1586 "Return the current line number for @var{port}.\n"
1588 "The first line of a file is 0. But you might want to add 1\n"
1589 "when printing line numbers, since starting from 1 is\n"
1590 "traditional in error messages, and likely to be more natural to\n"
1592 #define FUNC_NAME s_scm_port_line
1594 port
= SCM_COERCE_OUTPORT (port
);
1595 SCM_VALIDATE_OPENPORT (1, port
);
1596 return scm_from_long (SCM_LINUM (port
));
1600 SCM_DEFINE (scm_set_port_line_x
, "set-port-line!", 2, 0, 0,
1601 (SCM port
, SCM line
),
1602 "Set the current line number for @var{port} to @var{line}. The\n"
1603 "first line of a file is 0.")
1604 #define FUNC_NAME s_scm_set_port_line_x
1606 port
= SCM_COERCE_OUTPORT (port
);
1607 SCM_VALIDATE_OPENPORT (1, port
);
1608 SCM_PTAB_ENTRY (port
)->line_number
= scm_to_long (line
);
1609 return SCM_UNSPECIFIED
;
1613 SCM_DEFINE (scm_port_column
, "port-column", 1, 0, 0,
1615 "Return the current column number of @var{port}.\n"
1616 "If the number is\n"
1617 "unknown, the result is #f. Otherwise, the result is a 0-origin integer\n"
1618 "- i.e. the first character of the first line is line 0, column 0.\n"
1619 "(However, when you display a file position, for example in an error\n"
1620 "message, we recommend you add 1 to get 1-origin integers. This is\n"
1621 "because lines and column numbers traditionally start with 1, and that is\n"
1622 "what non-programmers will find most natural.)")
1623 #define FUNC_NAME s_scm_port_column
1625 port
= SCM_COERCE_OUTPORT (port
);
1626 SCM_VALIDATE_OPENPORT (1, port
);
1627 return scm_from_int (SCM_COL (port
));
1631 SCM_DEFINE (scm_set_port_column_x
, "set-port-column!", 2, 0, 0,
1632 (SCM port
, SCM column
),
1633 "Set the current column of @var{port}. Before reading the first\n"
1634 "character on a line the column should be 0.")
1635 #define FUNC_NAME s_scm_set_port_column_x
1637 port
= SCM_COERCE_OUTPORT (port
);
1638 SCM_VALIDATE_OPENPORT (1, port
);
1639 SCM_PTAB_ENTRY (port
)->column_number
= scm_to_int (column
);
1640 return SCM_UNSPECIFIED
;
1644 SCM_DEFINE (scm_port_filename
, "port-filename", 1, 0, 0,
1646 "Return the filename associated with @var{port}. This function returns\n"
1647 "the strings \"standard input\", \"standard output\" and \"standard error\"\n"
1648 "when called on the current input, output and error ports respectively.")
1649 #define FUNC_NAME s_scm_port_filename
1651 port
= SCM_COERCE_OUTPORT (port
);
1652 SCM_VALIDATE_OPENPORT (1, port
);
1653 return SCM_FILENAME (port
);
1657 SCM_DEFINE (scm_set_port_filename_x
, "set-port-filename!", 2, 0, 0,
1658 (SCM port
, SCM filename
),
1659 "Change the filename associated with @var{port}, using the current input\n"
1660 "port if none is specified. Note that this does not change the port's\n"
1661 "source of data, but only the value that is returned by\n"
1662 "@code{port-filename} and reported in diagnostic output.")
1663 #define FUNC_NAME s_scm_set_port_filename_x
1665 port
= SCM_COERCE_OUTPORT (port
);
1666 SCM_VALIDATE_OPENPORT (1, port
);
1667 /* We allow the user to set the filename to whatever he likes. */
1668 SCM_SET_FILENAME (port
, filename
);
1669 return SCM_UNSPECIFIED
;
1674 scm_print_port_mode (SCM exp
, SCM port
)
1676 scm_puts (SCM_CLOSEDP (exp
)
1678 : (SCM_RDNG
& SCM_CELL_WORD_0 (exp
)
1679 ? (SCM_WRTNG
& SCM_CELL_WORD_0 (exp
)
1682 : (SCM_WRTNG
& SCM_CELL_WORD_0 (exp
)
1689 scm_port_print (SCM exp
, SCM port
, scm_print_state
*pstate SCM_UNUSED
)
1691 char *type
= SCM_PTOBNAME (SCM_PTOBNUM (exp
));
1694 scm_puts ("#<", port
);
1695 scm_print_port_mode (exp
, port
);
1696 scm_puts (type
, port
);
1697 scm_putc (' ', port
);
1698 scm_uintprint (SCM_CELL_WORD_1 (exp
), 16, port
);
1699 scm_putc ('>', port
);
1704 scm_ports_prehistory ()
1707 scm_ptobs
= (scm_t_ptob_descriptor
*) scm_malloc (sizeof (scm_t_ptob_descriptor
));
1714 scm_t_bits scm_tc16_void_port
= 0;
1716 static int fill_input_void_port (SCM port SCM_UNUSED
)
1722 write_void_port (SCM port SCM_UNUSED
,
1723 const void *data SCM_UNUSED
,
1724 size_t size SCM_UNUSED
)
1729 scm_i_void_port (long mode_bits
)
1731 scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex
);
1733 SCM answer
= scm_new_port_table_entry (scm_tc16_void_port
);
1734 scm_t_port
* pt
= SCM_PTAB_ENTRY(answer
);
1736 scm_port_non_buffer (pt
);
1738 SCM_SETSTREAM (answer
, 0);
1739 SCM_SET_CELL_TYPE (answer
, scm_tc16_void_port
| mode_bits
);
1740 scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex
);
1746 scm_void_port (char *mode_str
)
1748 return scm_i_void_port (scm_mode_bits (mode_str
));
1751 SCM_DEFINE (scm_sys_make_void_port
, "%make-void-port", 1, 0, 0,
1753 "Create and return a new void port. A void port acts like\n"
1754 "@file{/dev/null}. The @var{mode} argument\n"
1755 "specifies the input/output modes for this port: see the\n"
1756 "documentation for @code{open-file} in @ref{File Ports}.")
1757 #define FUNC_NAME s_scm_sys_make_void_port
1759 return scm_i_void_port (scm_i_mode_bits (mode
));
1764 /* Initialization. */
1769 /* lseek() symbols. */
1770 scm_c_define ("SEEK_SET", scm_from_int (SEEK_SET
));
1771 scm_c_define ("SEEK_CUR", scm_from_int (SEEK_CUR
));
1772 scm_c_define ("SEEK_END", scm_from_int (SEEK_END
));
1774 scm_tc16_void_port
= scm_make_port_type ("void", fill_input_void_port
,
1777 cur_inport_fluid
= scm_permanent_object (scm_make_fluid ());
1778 cur_outport_fluid
= scm_permanent_object (scm_make_fluid ());
1779 cur_errport_fluid
= scm_permanent_object (scm_make_fluid ());
1780 cur_loadport_fluid
= scm_permanent_object (scm_make_fluid ());
1782 scm_i_port_weak_hash
= scm_permanent_object (scm_make_weak_key_hash_table (SCM_I_MAKINUM(31)));
1784 #include "libguile/ports.x"