1 /* Copyright (C) 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2, or (at your option)
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this software; see the file COPYING. If not, write to
15 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
16 * Boston, MA 02111-1307 USA
18 * As a special exception, the Free Software Foundation gives permission
19 * for additional uses of the text contained in its release of GUILE.
21 * The exception is that, if you link the GUILE library with other files
22 * to produce an executable, this does not by itself cause the
23 * resulting executable to be covered by the GNU General Public License.
24 * Your use of that executable is in no way restricted on account of
25 * linking the GUILE library code into it.
27 * This exception does not however invalidate any other reasons why
28 * the executable file might be covered by the GNU General Public License.
30 * This exception applies only to the code released by the
31 * Free Software Foundation under the name GUILE. If you copy
32 * code from other Free Software Foundation releases into a copy of
33 * GUILE, as the General Public License permits, the exception does
34 * not apply to the code that you add in this way. To avoid misleading
35 * anyone as to the status of such modified files, you must delete
36 * this exception notice from them.
38 * If you write modifications of your own for GUILE, it is your choice
39 * whether to permit this exception to apply to your modifications.
40 * If you do not wish that, delete this exception notice. */
42 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
43 gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
57 #include "scm_validate.h"
70 GUILE_PROC (scm_read_delimited_x
, "%read-delimited!", 3, 3, 0,
71 (SCM delims
, SCM buf
, SCM gobble
, SCM port
, SCM start
, SCM end
),
72 "Read characters from @var{port} into @var{buf} until one of the
73 characters in the @var{delims} string is encountered. If @var{gobble?}
74 is true, store the delimiter character in @var{buf} as well; otherwise,
75 discard it. If @var{port} is not specified, use the value of
76 @code{(current-input-port)}. If @var{start} or @var{end} are specified,
77 store data only into the substring of @var{buf} bounded by @var{start}
78 and @var{end} (which default to the beginning and end of the buffer,
81 Return a pair consisting of the delimiter that terminated the string and
82 the number of characters read. If reading stopped at the end of file,
83 the delimiter returned is the @var{eof-object}; if the buffer was filled
84 without encountering a delimiter, this value is @var{#f}.")
85 #define FUNC_NAME s_scm_read_delimited_x
95 SCM_VALIDATE_ROSTRING_COPY(1,delims
,cdelims
);
96 num_delims
= SCM_ROLENGTH (delims
);
97 SCM_VALIDATE_STRING_COPY(2,buf
,cbuf
);
98 cend
= SCM_LENGTH (buf
);
99 if (SCM_UNBNDP (port
))
102 SCM_VALIDATE_OPINPORT(4,port
);
104 SCM_VALIDATE_INT_DEF_COPY(5,start
,0,cstart
);
105 if (cstart
< 0 || cstart
>= cend
)
106 scm_out_of_range (FUNC_NAME
, start
);
108 SCM_VALIDATE_INT_DEF_COPY(6,end
,cend
,tend
);
109 if (tend
<= cstart
|| tend
> cend
)
110 scm_out_of_range (FUNC_NAME
, end
);
113 for (j
= cstart
; j
< cend
; j
++)
118 for (k
= 0; k
< num_delims
; k
++)
122 if (SCM_FALSEP (gobble
))
123 scm_ungetc (c
, port
);
125 return scm_cons (SCM_MAKICHR (c
),
126 scm_long2num (j
- cstart
));
130 return scm_cons (SCM_EOF_VAL
,
131 scm_long2num (j
- cstart
));
135 return scm_cons (SCM_BOOL_F
, scm_long2num (j
- cstart
));
139 static unsigned char *
140 scm_do_read_line (SCM port
, int *len_p
)
142 scm_port
*pt
= SCM_PTAB_ENTRY (port
);
145 /* I thought reading lines was simple. Mercy me. */
147 /* The common case: the buffer contains a complete line.
148 This needs to be fast. */
149 if ((end
= memchr (pt
->read_pos
, '\n', (pt
->read_end
- pt
->read_pos
)))
152 int buf_len
= (end
+ 1) - pt
->read_pos
;
153 /* Allocate a buffer of the perfect size. */
154 unsigned char *buf
= scm_must_malloc (buf_len
+ 1, "%read-line");
156 memcpy (buf
, pt
->read_pos
, buf_len
);
157 pt
->read_pos
+= buf_len
;
165 /* The buffer contains no newlines. */
167 /* When live, len is always the number of characters in the
168 current buffer that are part of the current line. */
169 int len
= (pt
->read_end
- pt
->read_pos
);
170 int buf_size
= (len
< 50) ? 60 : len
* 2;
171 /* Invariant: buf always has buf_size + 1 characters allocated;
172 the `+ 1' is for the final '\0'. */
173 unsigned char *buf
= scm_must_malloc (buf_size
+ 1, "%read-line");
178 if (buf_len
+ len
> buf_size
)
180 int new_size
= (buf_len
+ len
) * 2;
181 buf
= scm_must_realloc (buf
, buf_size
+ 1, new_size
+ 1,
186 /* Copy what we've got out of the port, into our buffer. */
187 memcpy (buf
+ buf_len
, pt
->read_pos
, len
);
191 /* If we had seen a newline, we're done now. */
195 /* Get more characters. */
196 if (scm_fill_input (port
) == EOF
)
198 /* If we're missing a final newline in the file, return
199 what we did get, sans newline. */
207 /* Search the buffer for newlines. */
208 if ((end
= memchr (pt
->read_pos
, '\n',
209 (len
= (pt
->read_end
- pt
->read_pos
))))
211 len
= (end
- pt
->read_pos
) + 1;
214 /* I wonder how expensive this realloc is. */
215 buf
= scm_must_realloc (buf
, buf_size
+ 1, buf_len
+ 1, "%read-line");
225 * truncates any terminating newline from its input, and returns
226 * a cons of the string read and its terminating character. Doing
227 * so makes it easy to implement the hairy `read-line' options
228 * efficiently in Scheme.
231 GUILE_PROC (scm_read_line
, "%read-line", 0, 1, 0,
233 "Read a newline-terminated line from @var{port}, allocating storage as
234 necessary. The newline terminator (if any) is removed from the string,
235 and a pair consisting of the line and its delimiter is returned. The
236 delimiter may be either a newline or the @var{eof-object}; if
237 @code{%read-line} is called at the end of file, it returns the pair
238 @code{(#<eof> . #<eof>)}.")
239 #define FUNC_NAME s_scm_read_line
246 if (SCM_UNBNDP (port
))
248 SCM_VALIDATE_OPINPORT(1,port
);
250 pt
= SCM_PTAB_ENTRY (port
);
251 if (pt
->rw_active
== SCM_PORT_WRITE
)
252 scm_ptobs
[SCM_PTOBNUM (port
)].flush (port
);
254 s
= scm_do_read_line (port
, &slen
);
257 term
= line
= SCM_EOF_VAL
;
260 if (s
[slen
-1] == '\n')
262 term
= SCM_MAKICHR ('\n');
264 line
= scm_take_str (s
, slen
-1);
265 scm_done_malloc (-1);
270 /* Fix: we should check for eof on the port before assuming this. */
272 line
= scm_take_str (s
, slen
);
273 SCM_COL (port
) += slen
;
278 pt
->rw_active
= SCM_PORT_READ
;
280 return scm_cons (line
, term
);
284 GUILE_PROC (scm_write_line
, "write-line", 1, 1, 0,
286 "Display @var{obj} and a newline character to @var{port}. If @var{port}
287 is not specified, @code{(current-output-port)} is used. This function
294 #define FUNC_NAME s_scm_write_line
296 scm_display (obj
, port
);
297 return scm_newline (port
);
301 GUILE_PROC (scm_ftell
, "ftell", 1, 0, 0,
303 "Returns an integer representing the current position of @var{fd/port},
304 measured from the beginning. Equivalent to:
306 (seek port 0 SEEK_CUR)
308 #define FUNC_NAME s_scm_ftell
310 return scm_seek (object
, SCM_INUM0
, SCM_MAKINUM (SEEK_CUR
));
314 GUILE_PROC (scm_fseek
, "fseek", 3, 0, 0,
315 (SCM object
, SCM offset
, SCM whence
),
316 "Obsolete. Almost the same as seek, above, but the return value is
318 #define FUNC_NAME s_scm_fseek
320 scm_seek (object
, offset
, whence
);
321 return SCM_UNSPECIFIED
;
325 GUILE_PROC (scm_redirect_port
, "redirect-port", 2, 0, 0,
327 "This procedure takes two ports and duplicates the underlying file
328 descriptor from @var{old-port} into @var{new-port}. The
329 current file descriptor in @var{new-port} will be closed.
330 After the redirection the two ports will share a file position
331 and file status flags.
333 The return value is unspecified.
335 Unexpected behaviour can result if both ports are subsequently used
336 and the original and/or duplicate ports are buffered.
338 This procedure does not have any side effects on other ports or
340 #define FUNC_NAME s_scm_redirect_port
342 int ans
, oldfd
, newfd
;
343 struct scm_fport
*fp
;
345 old
= SCM_COERCE_OUTPORT (old
);
346 new = SCM_COERCE_OUTPORT (new);
348 SCM_VALIDATE_OPFPORT(1,old
);
349 SCM_VALIDATE_OPFPORT(2,new);
350 oldfd
= SCM_FPORT_FDES (old
);
351 fp
= SCM_FSTREAM (new);
355 scm_port
*pt
= SCM_PTAB_ENTRY (new);
356 scm_port
*old_pt
= SCM_PTAB_ENTRY (old
);
357 scm_ptob_descriptor
*ptob
= &scm_ptobs
[SCM_PTOBNUM (new)];
359 /* must flush to old fdes. */
360 if (pt
->rw_active
== SCM_PORT_WRITE
)
362 else if (pt
->rw_active
== SCM_PORT_READ
)
364 ans
= dup2 (oldfd
, newfd
);
367 pt
->rw_random
= old_pt
->rw_random
;
368 /* continue using existing buffers, even if inappropriate. */
370 return SCM_UNSPECIFIED
;
374 GUILE_PROC (scm_dup_to_fdes
, "dup->fdes", 1, 1, 0,
375 (SCM fd_or_port
, SCM fd
),
376 "Returns an integer file descriptor.")
377 #define FUNC_NAME s_scm_dup_to_fdes
379 int oldfd
, newfd
, rv
;
381 fd_or_port
= SCM_COERCE_OUTPORT (fd_or_port
);
383 if (SCM_INUMP (fd_or_port
))
384 oldfd
= SCM_INUM (fd_or_port
);
387 SCM_VALIDATE_OPFPORT(1,fd_or_port
);
388 oldfd
= SCM_FPORT_FDES (fd_or_port
);
396 fd
= SCM_MAKINUM (newfd
);
400 SCM_ASSERT (SCM_INUMP (fd
), fd
, SCM_ARG2
, FUNC_NAME
);
401 newfd
= SCM_INUM (fd
);
404 scm_evict_ports (newfd
); /* see scsh manual. */
405 rv
= dup2 (oldfd
, newfd
);
414 GUILE_PROC (scm_fileno
, "fileno", 1, 0, 0,
416 "Returns the integer file descriptor underlying @var{port}.
417 Does not change its revealed count.")
418 #define FUNC_NAME s_scm_fileno
420 port
= SCM_COERCE_OUTPORT (port
);
421 SCM_VALIDATE_OPFPORT(1,port
);
422 return SCM_MAKINUM (SCM_FPORT_FDES (port
));
426 /* GJB:FIXME:: why does this not throw
427 an error if the arg is not a port?
428 This proc as is would be better names isattyport?
429 if it is not going to assume that the arg is a port */
430 GUILE_PROC (scm_isatty_p
, "isatty?", 1, 0, 0,
432 "Returns @code{#t} if @var{port} is using a serial
433 non-file device, otherwise @code{#f}.")
434 #define FUNC_NAME s_scm_isatty_p
438 port
= SCM_COERCE_OUTPORT (port
);
440 if (!(SCM_NIMP (port
) && SCM_OPFPORTP (port
)))
443 rv
= isatty (SCM_FPORT_FDES (port
));
450 GUILE_PROC (scm_fdopen
, "fdopen", 2, 0, 0,
451 (SCM fdes
, SCM modes
),
452 "Returns a new port based on the file descriptor @var{fdes}.
453 Modes are given by the string @var{modes}. The revealed count of the port
454 is initialized to zero. The modes string is the same as that accepted
455 by @ref{File Ports, open-file}.")
456 #define FUNC_NAME s_scm_fdopen
460 SCM_VALIDATE_INT(1,fdes
);
461 SCM_VALIDATE_ROSTRING(2,modes
);
462 SCM_COERCE_SUBSTR (modes
);
463 port
= scm_fdes_to_port (SCM_INUM (fdes
), SCM_ROCHARS (modes
), SCM_BOOL_F
);
470 /* Move a port's underlying file descriptor to a given value.
471 * Returns #f if fdes is already the given value.
473 * MOVE->FDES is implemented in Scheme and calls this primitive.
475 GUILE_PROC (scm_primitive_move_to_fdes
, "primitive-move->fdes", 2, 0, 0,
477 "Moves the underlying file descriptor for @var{port} to the integer
478 value @var{fdes} without changing the revealed count of @var{port}.
479 Any other ports already using this descriptor will be automatically
480 shifted to new descriptors and their revealed counts reset to zero.
481 The return value is @code{#f} if the file descriptor already had the
482 required value or @code{#t} if it was moved.")
483 #define FUNC_NAME s_scm_primitive_move_to_fdes
485 struct scm_fport
*stream
;
490 port
= SCM_COERCE_OUTPORT (port
);
492 SCM_VALIDATE_OPFPORT(1,port
);
493 SCM_VALIDATE_INT(2,fd
);
494 stream
= SCM_FSTREAM (port
);
495 old_fd
= stream
->fdes
;
496 new_fd
= SCM_INUM (fd
);
497 if (old_fd
== new_fd
)
501 scm_evict_ports (new_fd
);
502 rv
= dup2 (old_fd
, new_fd
);
505 stream
->fdes
= new_fd
;
506 SCM_SYSCALL (close (old_fd
));
511 /* Return a list of ports using a given file descriptor. */
512 GUILE_PROC(scm_fdes_to_ports
, "fdes->ports", 1, 0, 0,
514 "Returns a list of existing ports which have @var{fdes} as an
515 underlying file descriptor, without changing their revealed counts.")
516 #define FUNC_NAME s_scm_fdes_to_ports
518 SCM result
= SCM_EOL
;
522 SCM_VALIDATE_INT_COPY(1,fd
,int_fd
);
524 for (i
= 0; i
< scm_port_table_size
; i
++)
526 if (SCM_OPFPORTP (scm_port_table
[i
]->port
)
527 && ((struct scm_fport
*) scm_port_table
[i
]->stream
)->fdes
== int_fd
)
528 result
= scm_cons (scm_port_table
[i
]->port
, result
);
538 scm_add_feature ("i/o-extensions");