|
428
|
1 /* Generic stream implementation.
|
|
|
2 Copyright (C) 1995 Free Software Foundation, Inc.
|
|
|
3 Copyright (C) 1995 Sun Microsystems, Inc.
|
|
788
|
4 Copyright (C) 1996, 2001, 2002 Ben Wing.
|
|
428
|
5
|
|
|
6 This file is part of XEmacs.
|
|
|
7
|
|
|
8 XEmacs is free software; you can redistribute it and/or modify it
|
|
|
9 under the terms of the GNU General Public License as published by the
|
|
|
10 Free Software Foundation; either version 2, or (at your option) any
|
|
|
11 later version.
|
|
|
12
|
|
|
13 XEmacs is distributed in the hope that it will be useful, but WITHOUT
|
|
|
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
|
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
|
16 for more details.
|
|
|
17
|
|
|
18 You should have received a copy of the GNU General Public License
|
|
|
19 along with XEmacs; see the file COPYING. If not, write to
|
|
|
20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
|
21 Boston, MA 02111-1307, USA. */
|
|
|
22
|
|
|
23 /* Synched up with: Not in FSF. */
|
|
|
24
|
|
|
25 /* Written by Ben Wing. */
|
|
|
26
|
|
|
27 #include <config.h>
|
|
|
28 #include "lisp.h"
|
|
|
29
|
|
|
30 #include "buffer.h"
|
|
|
31 #include "insdel.h"
|
|
|
32 #include "lstream.h"
|
|
|
33
|
|
|
34 #include "sysfile.h"
|
|
|
35
|
|
771
|
36 /* This module provides a generic buffering stream implementation.
|
|
428
|
37 Conceptually, you send data to the stream or read data from the
|
|
|
38 stream, not caring what's on the other end of the stream. The
|
|
|
39 other end could be another stream, a file descriptor, a stdio
|
|
|
40 stream, a fixed block of memory, a reallocating block of memory,
|
|
|
41 etc. The main purpose of the stream is to provide a standard
|
|
|
42 interface and to do buffering. Macros are defined to read
|
|
|
43 or write characters, so the calling functions do not have to
|
|
|
44 worry about blocking data together in order to achieve efficiency.
|
|
|
45
|
|
771
|
46 Note that this object is called "stream" in Lisp but "lstream"
|
|
428
|
47 in C. The reason for this is that "stream" is too generic a name
|
|
|
48 for C; too much likelihood of conflict/confusion with C++, etc. */
|
|
|
49
|
|
|
50 #define DEFAULT_BLOCK_BUFFERING_SIZE 512
|
|
|
51 #define MAX_READ_SIZE 512
|
|
|
52
|
|
|
53 static Lisp_Object
|
|
|
54 mark_lstream (Lisp_Object obj)
|
|
|
55 {
|
|
|
56 Lstream *lstr = XLSTREAM (obj);
|
|
|
57 return lstr->imp->marker ? (lstr->imp->marker) (obj) : Qnil;
|
|
|
58 }
|
|
|
59
|
|
|
60 static void
|
|
|
61 print_lstream (Lisp_Object obj, Lisp_Object printcharfun, int escapeflag)
|
|
|
62 {
|
|
|
63 Lstream *lstr = XLSTREAM (obj);
|
|
|
64
|
|
800
|
65 write_fmt_string (printcharfun,
|
|
|
66 "#<INTERNAL OBJECT (XEmacs bug?) (%s lstream) 0x%lx>",
|
|
|
67 lstr->imp->name, (long) lstr);
|
|
428
|
68 }
|
|
|
69
|
|
|
70 static void
|
|
|
71 finalize_lstream (void *header, int for_disksave)
|
|
|
72 {
|
|
|
73 /* WARNING WARNING WARNING. This function (and all finalize functions)
|
|
|
74 may get called more than once on the same object, and may get called
|
|
|
75 (at dump time) on objects that are not being released. */
|
|
|
76 Lstream *lstr = (Lstream *) header;
|
|
|
77
|
|
|
78 #if 0 /* this may cause weird Broken Pipes? */
|
|
|
79 if (for_disksave)
|
|
|
80 {
|
|
|
81 Lstream_pseudo_close (lstr);
|
|
|
82 return;
|
|
|
83 }
|
|
|
84 #endif
|
|
|
85 if (lstr->flags & LSTREAM_FL_IS_OPEN)
|
|
|
86 {
|
|
|
87 if (for_disksave)
|
|
|
88 {
|
|
|
89 if (lstr->flags & LSTREAM_FL_CLOSE_AT_DISKSAVE)
|
|
|
90 Lstream_close (lstr);
|
|
|
91 }
|
|
|
92 else
|
|
|
93 /* Just close. */
|
|
|
94 Lstream_close (lstr);
|
|
|
95 }
|
|
771
|
96
|
|
|
97 if (!for_disksave)
|
|
|
98 {
|
|
|
99 if (lstr->imp->finalizer)
|
|
|
100 (lstr->imp->finalizer) (lstr);
|
|
|
101 }
|
|
428
|
102 }
|
|
|
103
|
|
665
|
104 inline static Bytecount
|
|
|
105 aligned_sizeof_lstream (Bytecount lstream_type_specific_size)
|
|
456
|
106 {
|
|
826
|
107 return MAX_ALIGN_SIZE (offsetof (Lstream, data) +
|
|
|
108 lstream_type_specific_size);
|
|
456
|
109 }
|
|
|
110
|
|
665
|
111 static Bytecount
|
|
442
|
112 sizeof_lstream (const void *header)
|
|
428
|
113 {
|
|
456
|
114 return aligned_sizeof_lstream (((const Lstream *) header)->imp->size);
|
|
428
|
115 }
|
|
|
116
|
|
934
|
117 #ifdef USE_KKCC
|
|
|
118 DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION ("stream", lstream,
|
|
|
119 0, /*dumpable-flag*/
|
|
|
120 mark_lstream, print_lstream,
|
|
|
121 finalize_lstream, 0, 0, 0,
|
|
|
122 sizeof_lstream, Lstream);
|
|
|
123 #else /* not USE_KKCC */
|
|
428
|
124 DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION ("stream", lstream,
|
|
|
125 mark_lstream, print_lstream,
|
|
|
126 finalize_lstream, 0, 0, 0,
|
|
|
127 sizeof_lstream, Lstream);
|
|
934
|
128 #endif /* not USE_KKCC */
|
|
428
|
129
|
|
771
|
130
|
|
|
131 /* Change the buffering of a stream. See lstream.h. By default the
|
|
|
132 buffering is STREAM_BLOCK_BUFFERED. */
|
|
|
133
|
|
428
|
134 void
|
|
|
135 Lstream_set_buffering (Lstream *lstr, Lstream_buffering buffering,
|
|
|
136 int buffering_size)
|
|
|
137 {
|
|
|
138 lstr->buffering = buffering;
|
|
|
139 switch (buffering)
|
|
|
140 {
|
|
|
141 case LSTREAM_UNBUFFERED:
|
|
|
142 lstr->buffering_size = 0; break;
|
|
|
143 case LSTREAM_BLOCK_BUFFERED:
|
|
|
144 lstr->buffering_size = DEFAULT_BLOCK_BUFFERING_SIZE; break;
|
|
|
145 case LSTREAM_BLOCKN_BUFFERED:
|
|
|
146 lstr->buffering_size = buffering_size; break;
|
|
|
147 case LSTREAM_LINE_BUFFERED:
|
|
|
148 case LSTREAM_UNLIMITED:
|
|
|
149 lstr->buffering_size = INT_MAX; break;
|
|
|
150 }
|
|
|
151 }
|
|
|
152
|
|
442
|
153 static const Lstream_implementation *lstream_types[32];
|
|
428
|
154 static Lisp_Object Vlstream_free_list[32];
|
|
|
155 static int lstream_type_count;
|
|
|
156
|
|
771
|
157 /* Allocate and return a new Lstream. This function is not really
|
|
|
158 meant to be called directly; rather, each stream type should
|
|
|
159 provide its own stream creation function, which creates the stream
|
|
|
160 and does any other necessary creation stuff (e.g. opening a
|
|
|
161 file). */
|
|
|
162
|
|
428
|
163 Lstream *
|
|
442
|
164 Lstream_new (const Lstream_implementation *imp, const char *mode)
|
|
428
|
165 {
|
|
|
166 Lstream *p;
|
|
|
167 int i;
|
|
|
168
|
|
|
169 for (i = 0; i < lstream_type_count; i++)
|
|
|
170 {
|
|
|
171 if (lstream_types[i] == imp)
|
|
|
172 break;
|
|
|
173 }
|
|
|
174
|
|
|
175 if (i == lstream_type_count)
|
|
|
176 {
|
|
|
177 assert (lstream_type_count < countof (lstream_types));
|
|
|
178 lstream_types[lstream_type_count] = imp;
|
|
|
179 Vlstream_free_list[lstream_type_count] =
|
|
456
|
180 make_lcrecord_list (aligned_sizeof_lstream (imp->size),
|
|
428
|
181 &lrecord_lstream);
|
|
|
182 lstream_type_count++;
|
|
|
183 }
|
|
|
184
|
|
|
185 p = XLSTREAM (allocate_managed_lcrecord (Vlstream_free_list[i]));
|
|
|
186 /* Zero it out, except the header. */
|
|
456
|
187 memset ((char *) p + sizeof (p->header), '\0',
|
|
|
188 aligned_sizeof_lstream (imp->size) - sizeof (p->header));
|
|
428
|
189 p->imp = imp;
|
|
|
190 Lstream_set_buffering (p, LSTREAM_BLOCK_BUFFERED, 0);
|
|
|
191 p->flags = LSTREAM_FL_IS_OPEN;
|
|
|
192
|
|
|
193 /* convert mode (one of "r", "w", "rc", "wc") to p->flags */
|
|
|
194 assert (mode[0] == 'r' || mode[0] == 'w');
|
|
|
195 assert (mode[1] == 'c' || mode[1] == '\0');
|
|
|
196 p->flags |= (mode[0] == 'r' ? LSTREAM_FL_READ : LSTREAM_FL_WRITE);
|
|
|
197 if (mode[1] == 'c')
|
|
|
198 p->flags |= LSTREAM_FL_NO_PARTIAL_CHARS;
|
|
|
199
|
|
|
200 return p;
|
|
|
201 }
|
|
|
202
|
|
771
|
203 /* Set or unset "character mode" on the stream. The basic idea is that,
|
|
|
204 assuming valid internal-format data is passing through the stream and
|
|
|
205 we're processing the data character by character, we don't want partial
|
|
|
206 characters at the end of the data. (No partial characters at the
|
|
|
207 beginning happens naturally if we eliminate partial characters at the
|
|
|
208 end and the stream is implemented correctly.)
|
|
|
209
|
|
|
210 Character mode actually has two somewhat different meanings, depending
|
|
|
211 on whether this is a read stream or write stream. If a read stream,
|
|
|
212 character mode means that data returned from calling Lstream_read() on
|
|
|
213 the stream will contain only full characters. If a write stream,
|
|
|
214 character mode means that data passed to the write method in the stream
|
|
|
215 implementation will contain only full characters. It's important to
|
|
|
216 note the non-parallelism in who should set this mode on the stream: The
|
|
|
217 *CALLER* sets character mode on read streams it creates; the *STREAM
|
|
|
218 ITSELF* sets character mode on write streams, typically at creation
|
|
814
|
219 time.
|
|
|
220
|
|
|
221 (However, if a read stream always generates internal-format data, then
|
|
|
222 the callers will almost always want character mode, and it's allowed to
|
|
|
223 set this on behalf of the caller, as long as a flag can be provided at
|
|
|
224 creation time to disable this behavior.) */
|
|
771
|
225
|
|
428
|
226 void
|
|
|
227 Lstream_set_character_mode (Lstream *lstr)
|
|
|
228 {
|
|
|
229 lstr->flags |= LSTREAM_FL_NO_PARTIAL_CHARS;
|
|
|
230 }
|
|
|
231
|
|
771
|
232 /* Unset character mode. See Lstream_set_character_mode(). */
|
|
|
233
|
|
|
234 void
|
|
|
235 Lstream_unset_character_mode (Lstream *lstr)
|
|
|
236 {
|
|
|
237 lstr->flags &= ~LSTREAM_FL_NO_PARTIAL_CHARS;
|
|
|
238 }
|
|
|
239
|
|
|
240 /* Close the stream (if it's open), and free all memory associated with the
|
|
|
241 stream. Put the stream on a free list; later calls to create a new
|
|
|
242 stream of this type may reuse this stream. Calling this is not strictly
|
|
|
243 necessary, but it is much more efficient than having the Lstream be
|
|
|
244 garbage-collected. Be VERY VERY SURE there are no pointers to this
|
|
|
245 object hanging around anywhere where they might be used! When streams
|
|
|
246 are chained together, be VERY CAREFUL of the order in which you delete
|
|
|
247 them! (e.g. if the streams are in a singly-linked list, delete the head
|
|
814
|
248 first; this will close (but check the documentation, e.g. of
|
|
|
249 make_coding_input_stream()), and may send data down to the rest. Then
|
|
771
|
250 proceed to the rest, one by one. If the chains are in a doubly-linked
|
|
|
251 list, close all the streams first (again, from the head to the tail),
|
|
|
252 disconnect the back links, then delete starting from the head. In
|
|
814
|
253 general, it's a good idea to close everything before deleting anything.
|
|
771
|
254
|
|
|
255 NOTE: DO NOT CALL DURING GARBAGE COLLECTION (e.g. in a finalizer). You
|
|
|
256 will be aborted. See free_managed_lcrecord(). */
|
|
|
257
|
|
428
|
258 void
|
|
|
259 Lstream_delete (Lstream *lstr)
|
|
|
260 {
|
|
|
261 int i;
|
|
793
|
262 Lisp_Object val = wrap_lstream (lstr);
|
|
428
|
263
|
|
|
264 for (i = 0; i < lstream_type_count; i++)
|
|
|
265 {
|
|
|
266 if (lstream_types[i] == lstr->imp)
|
|
|
267 {
|
|
|
268 free_managed_lcrecord (Vlstream_free_list[i], val);
|
|
|
269 return;
|
|
|
270 }
|
|
|
271 }
|
|
|
272
|
|
|
273 abort ();
|
|
|
274 }
|
|
|
275
|
|
|
276 #define Lstream_internal_error(reason, lstr) \
|
|
563
|
277 signal_error (Qinternal_error, reason, wrap_lstream (lstr))
|
|
428
|
278
|
|
771
|
279 /* Reopen a closed stream. This enables I/O on it again. This is not
|
|
|
280 meant to be called except from a wrapper routine that reinitializes
|
|
|
281 variables and such -- the close routine may well have freed some
|
|
|
282 necessary storage structures, for example. */
|
|
|
283
|
|
428
|
284 void
|
|
|
285 Lstream_reopen (Lstream *lstr)
|
|
|
286 {
|
|
|
287 if (lstr->flags & LSTREAM_FL_IS_OPEN)
|
|
|
288 Lstream_internal_error ("lstream already open", lstr);
|
|
|
289 lstr->flags |= LSTREAM_FL_IS_OPEN;
|
|
|
290 }
|
|
|
291
|
|
771
|
292 /* Try to write as much of DATA as possible to the stream. Return the
|
|
|
293 number of bytes written. */
|
|
428
|
294
|
|
771
|
295 static int
|
|
|
296 Lstream_really_write (Lstream *lstr, const unsigned char *data, int size)
|
|
428
|
297 {
|
|
665
|
298 Bytecount num_written;
|
|
771
|
299 const unsigned char *orig_data = data;
|
|
|
300 int error_occurred = 0;
|
|
428
|
301
|
|
771
|
302 while (size > 0)
|
|
428
|
303 {
|
|
|
304 if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
|
|
|
305 Lstream_internal_error ("lstream not open", lstr);
|
|
|
306 if (! (lstr->flags & LSTREAM_FL_WRITE))
|
|
|
307 Lstream_internal_error ("lstream not open for writing", lstr);
|
|
|
308 if (!lstr->imp->writer)
|
|
|
309 Lstream_internal_error ("lstream has no writer", lstr);
|
|
|
310
|
|
|
311 if (lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS)
|
|
|
312 /* It's quite possible for us to get passed an incomplete
|
|
|
313 character at the end. We need to spit back that
|
|
|
314 incomplete character. */
|
|
|
315 {
|
|
442
|
316 const unsigned char *dataend = data + size - 1;
|
|
428
|
317 assert (size > 0); /* safety check ... */
|
|
|
318 /* Optimize the most common case. */
|
|
826
|
319 if (!byte_ascii_p (*dataend))
|
|
428
|
320 {
|
|
|
321 /* Go back to the beginning of the last (and possibly partial)
|
|
|
322 character, and bump forward to see if the character is
|
|
|
323 complete. */
|
|
867
|
324 VALIDATE_IBYTEPTR_BACKWARD (dataend);
|
|
826
|
325 if (dataend + rep_bytes_by_first_byte (*dataend) != data + size)
|
|
428
|
326 /* If not, chop the size down to ignore the last char
|
|
|
327 and stash it away for next time. */
|
|
|
328 size = dataend - data;
|
|
|
329 /* If we don't even have one character to write, then just
|
|
|
330 skip out. */
|
|
|
331 if (size == 0)
|
|
|
332 break;
|
|
|
333 }
|
|
|
334 }
|
|
|
335
|
|
771
|
336 num_written = (lstr->imp->writer) (lstr, data, size);
|
|
428
|
337 if (num_written == 0)
|
|
|
338 /* If nothing got written, then just hold the data. This may
|
|
|
339 occur, for example, if this stream does non-blocking I/O;
|
|
|
340 the attempt to write the data might have resulted in an
|
|
|
341 EWOULDBLOCK error. */
|
|
771
|
342 break;
|
|
|
343 else if (num_written > size)
|
|
|
344 abort ();
|
|
428
|
345 else if (num_written > 0)
|
|
|
346 {
|
|
771
|
347 data += num_written;
|
|
|
348 size -= num_written;
|
|
428
|
349 }
|
|
|
350 else
|
|
771
|
351 {
|
|
|
352 /* If error, just hold the data, for similar reasons as above. */
|
|
|
353 error_occurred = 1;
|
|
|
354 break;
|
|
|
355 }
|
|
428
|
356 }
|
|
|
357
|
|
|
358 if (lstr->imp->flusher)
|
|
771
|
359 error_occurred = (lstr->imp->flusher) (lstr) < 0;
|
|
|
360
|
|
|
361 if (data == orig_data && error_occurred)
|
|
|
362 return -1;
|
|
|
363
|
|
|
364 return data - orig_data;
|
|
|
365 }
|
|
|
366
|
|
|
367 /* Attempt to flush out all of the buffered data for writing. Leaves
|
|
|
368 whatever wasn't flushed sitting in the stream's buffers. Return -1 if
|
|
|
369 nothing written and error occurred, 0 otherwise. */
|
|
428
|
370
|
|
771
|
371 int
|
|
|
372 Lstream_flush_out (Lstream *lstr)
|
|
|
373 {
|
|
|
374 Bytecount num_written =
|
|
|
375 Lstream_really_write (lstr, lstr->out_buffer, lstr->out_buffer_ind);
|
|
|
376 if (num_written == lstr->out_buffer_ind)
|
|
|
377 {
|
|
|
378 lstr->out_buffer_ind = 0;
|
|
|
379 return 0;
|
|
|
380 }
|
|
|
381 else if (num_written > 0)
|
|
|
382 {
|
|
|
383 memmove (lstr->out_buffer, lstr->out_buffer + num_written,
|
|
|
384 lstr->out_buffer_ind - num_written);
|
|
|
385 lstr->out_buffer_ind -= num_written;
|
|
|
386 return 0;
|
|
|
387 }
|
|
|
388 else return num_written;
|
|
428
|
389 }
|
|
|
390
|
|
771
|
391 /* Flush out any pending unwritten data in the stream. Clear any buffered
|
|
|
392 input data. This differs from Lstream_flush_out() in that it also
|
|
|
393 clears any unflushable buffered data. Returns 0 on success, -1 on
|
|
|
394 error. */
|
|
|
395
|
|
428
|
396 int
|
|
|
397 Lstream_flush (Lstream *lstr)
|
|
|
398 {
|
|
|
399 if (Lstream_flush_out (lstr) < 0)
|
|
|
400 return -1;
|
|
|
401
|
|
|
402 /* clear out buffered data */
|
|
|
403 lstr->in_buffer_current = lstr->in_buffer_ind = 0;
|
|
|
404 lstr->unget_buffer_ind = 0;
|
|
|
405
|
|
|
406 return 0;
|
|
|
407 }
|
|
|
408
|
|
|
409 /* We want to add NUM characters. This function ensures that the
|
|
|
410 buffer is large enough for this (per the buffering size specified
|
|
|
411 in the stream) and returns the number of characters we can
|
|
|
412 actually write. If FORCE is set, ignore the buffering size
|
|
|
413 and go ahead and make space for all the chars even if it exceeds
|
|
|
414 the buffering size. (This is used to deal with the possibility
|
|
|
415 that the stream writer might refuse to write any bytes now, e.g.
|
|
|
416 if it's getting EWOULDBLOCK errors. We have to keep stocking them
|
|
771
|
417 up until they can be written, so as to avoid losing data.) */
|
|
428
|
418
|
|
665
|
419 static Bytecount
|
|
|
420 Lstream_adding (Lstream *lstr, Bytecount num, int force)
|
|
428
|
421 {
|
|
665
|
422 Bytecount size = num + lstr->out_buffer_ind;
|
|
430
|
423
|
|
|
424 if (size <= lstr->out_buffer_size)
|
|
|
425 return num;
|
|
|
426
|
|
428
|
427 /* Maybe chop it down so that we don't buffer more characters
|
|
|
428 than our advertised buffering size. */
|
|
430
|
429 if ((size > lstr->buffering_size) && !force)
|
|
|
430 {
|
|
|
431 size = lstr->buffering_size;
|
|
|
432 /* There might be more data buffered than the buffering size. */
|
|
|
433 if (size <= lstr->out_buffer_ind)
|
|
|
434 return 0;
|
|
|
435 }
|
|
|
436
|
|
|
437 DO_REALLOC (lstr->out_buffer, lstr->out_buffer_size, size, unsigned char);
|
|
|
438
|
|
|
439 return size - lstr->out_buffer_ind;
|
|
428
|
440 }
|
|
|
441
|
|
|
442 /* Like Lstream_write(), but does not handle line-buffering correctly. */
|
|
|
443
|
|
771
|
444 static int
|
|
665
|
445 Lstream_write_1 (Lstream *lstr, const void *data, Bytecount size)
|
|
428
|
446 {
|
|
442
|
447 const unsigned char *p = (const unsigned char *) data;
|
|
665
|
448 Bytecount off = 0;
|
|
428
|
449 if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
|
|
|
450 Lstream_internal_error ("lstream not open", lstr);
|
|
|
451 if (! (lstr->flags & LSTREAM_FL_WRITE))
|
|
|
452 Lstream_internal_error ("lstream not open for writing", lstr);
|
|
771
|
453
|
|
|
454 if (lstr->buffering == LSTREAM_UNBUFFERED)
|
|
|
455 {
|
|
|
456 /* If there is buffered data, it means we ran into blocking
|
|
|
457 errors the previous time and had to buffer our remaining
|
|
|
458 data. Try to write it now. */
|
|
|
459 if (lstr->out_buffer_ind > 0)
|
|
|
460 {
|
|
|
461 if (Lstream_flush_out (lstr) < 0)
|
|
|
462 return -1;
|
|
|
463 }
|
|
|
464
|
|
|
465 /* If not still blocked, try to write the new data */
|
|
|
466 if (lstr->out_buffer_ind == 0)
|
|
|
467 {
|
|
|
468 /* we don't need to loop because Lstream_really_write does that
|
|
|
469 for us. */
|
|
|
470 Bytecount num_written = Lstream_really_write (lstr, p, size);
|
|
|
471 if (num_written < 0)
|
|
|
472 return -1;
|
|
|
473 off += num_written;
|
|
|
474 }
|
|
|
475
|
|
|
476 /* squirrel away the rest of the data */
|
|
|
477 if (off < size)
|
|
|
478 {
|
|
|
479 Lstream_adding (lstr, size - off, 1);
|
|
|
480 memcpy (lstr->out_buffer + lstr->out_buffer_ind, p + off,
|
|
|
481 size - off);
|
|
|
482 lstr->out_buffer_ind += size - off;
|
|
|
483 }
|
|
|
484
|
|
|
485 lstr->byte_count += size;
|
|
|
486 return 0;
|
|
|
487 }
|
|
|
488 else
|
|
|
489 {
|
|
|
490 int couldnt_write_last_time = 0;
|
|
428
|
491
|
|
771
|
492 while (1)
|
|
|
493 {
|
|
|
494 /* Figure out how much we can add to the buffer */
|
|
|
495 Bytecount chunk = Lstream_adding (lstr, size, 0);
|
|
|
496 if (chunk == 0)
|
|
|
497 {
|
|
|
498 if (couldnt_write_last_time)
|
|
|
499 /* Ung, we ran out of space and tried to flush
|
|
|
500 the buffer, but it didn't work because the stream
|
|
|
501 writer is refusing to accept any data. So we
|
|
|
502 just have to squirrel away all the rest of the
|
|
|
503 stuff. */
|
|
|
504 chunk = Lstream_adding (lstr, size, 1);
|
|
|
505 else
|
|
|
506 couldnt_write_last_time = 1;
|
|
|
507 }
|
|
|
508 /* Do it. */
|
|
|
509 if (chunk > 0)
|
|
|
510 {
|
|
|
511 memcpy (lstr->out_buffer + lstr->out_buffer_ind, p + off, chunk);
|
|
|
512 lstr->out_buffer_ind += chunk;
|
|
|
513 lstr->byte_count += chunk;
|
|
|
514 size -= chunk;
|
|
|
515 off += chunk;
|
|
|
516 }
|
|
|
517 /* If the buffer is full and we have more to add, flush it out. */
|
|
|
518 if (size > 0)
|
|
|
519 {
|
|
|
520 if (Lstream_flush_out (lstr) < 0)
|
|
|
521 {
|
|
|
522 if (off == 0)
|
|
|
523 return -1;
|
|
|
524 else
|
|
|
525 return 0;
|
|
|
526 }
|
|
|
527 }
|
|
|
528 else
|
|
|
529 break;
|
|
|
530 }
|
|
|
531 }
|
|
|
532 return 0;
|
|
428
|
533 }
|
|
|
534
|
|
771
|
535 /* Write SIZE bytes of DATA to the stream. Return value is 0 on success,
|
|
|
536 -1 on error. -1 is only returned when no bytes could be written; if any
|
|
|
537 bytes could be written, then 0 is returned and any unwritten bytes are
|
|
|
538 buffered and the next call to Lstream_write() will try to write them
|
|
|
539 again. (This buffering happens even when the stream's buffering type is
|
|
|
540 LSTREAM_UNBUFFERED, and regardless of how much data is passed in or what
|
|
|
541 the stream's buffering size was set to. #### There should perhaps be a
|
|
|
542 way to control whether this happens.) */
|
|
428
|
543
|
|
771
|
544 int
|
|
665
|
545 Lstream_write (Lstream *lstr, const void *data, Bytecount size)
|
|
428
|
546 {
|
|
665
|
547 Bytecount i;
|
|
442
|
548 const unsigned char *p = (const unsigned char *) data;
|
|
428
|
549
|
|
771
|
550 /* If the stream is not line-buffered, then we can just call
|
|
|
551 Lstream_write_1(), which writes in chunks. Otherwise, we repeatedly
|
|
|
552 call Lstream_putc(), which knows how to handle line buffering.
|
|
|
553 Returns 0 on success, -1 on failure. */
|
|
|
554
|
|
428
|
555 if (size == 0)
|
|
771
|
556 return 0;
|
|
428
|
557 if (lstr->buffering != LSTREAM_LINE_BUFFERED)
|
|
|
558 return Lstream_write_1 (lstr, data, size);
|
|
|
559 for (i = 0; i < size; i++)
|
|
|
560 {
|
|
|
561 if (Lstream_putc (lstr, p[i]) < 0)
|
|
|
562 break;
|
|
|
563 }
|
|
771
|
564 return i == 0 ? -1 : 0;
|
|
428
|
565 }
|
|
|
566
|
|
|
567 int
|
|
|
568 Lstream_was_blocked_p (Lstream *lstr)
|
|
|
569 {
|
|
|
570 return lstr->imp->was_blocked_p ? lstr->imp->was_blocked_p (lstr) : 0;
|
|
|
571 }
|
|
|
572
|
|
665
|
573 static Bytecount
|
|
462
|
574 Lstream_raw_read (Lstream *lstr, unsigned char *buffer,
|
|
665
|
575 Bytecount size)
|
|
428
|
576 {
|
|
|
577 if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
|
|
|
578 Lstream_internal_error ("lstream not open", lstr);
|
|
|
579 if (! (lstr->flags & LSTREAM_FL_READ))
|
|
|
580 Lstream_internal_error ("lstream not open for reading", lstr);
|
|
|
581 if (!lstr->imp->reader)
|
|
|
582 Lstream_internal_error ("lstream has no reader", lstr);
|
|
|
583
|
|
|
584 return (lstr->imp->reader) (lstr, buffer, size);
|
|
|
585 }
|
|
|
586
|
|
|
587 /* Assuming the buffer is empty, fill it up again. */
|
|
|
588
|
|
665
|
589 static Bytecount
|
|
428
|
590 Lstream_read_more (Lstream *lstr)
|
|
|
591 {
|
|
|
592 #if 0
|
|
665
|
593 Bytecount size_needed
|
|
462
|
594 = max (1, min (MAX_READ_SIZE, lstr->buffering_size));
|
|
428
|
595 #else
|
|
|
596 /* If someone requested a larger buffer size, so be it! */
|
|
665
|
597 Bytecount size_needed =
|
|
462
|
598 max (1, lstr->buffering_size);
|
|
428
|
599 #endif
|
|
665
|
600 Bytecount size_gotten;
|
|
428
|
601
|
|
|
602 DO_REALLOC (lstr->in_buffer, lstr->in_buffer_size,
|
|
|
603 size_needed, unsigned char);
|
|
|
604 size_gotten = Lstream_raw_read (lstr, lstr->in_buffer, size_needed);
|
|
|
605 lstr->in_buffer_current = max (0, size_gotten);
|
|
|
606 lstr->in_buffer_ind = 0;
|
|
|
607 return size_gotten < 0 ? -1 : size_gotten;
|
|
|
608 }
|
|
|
609
|
|
771
|
610 /* Read SIZE bytes of DATA from the stream. Return the number of bytes
|
|
|
611 read. 0 means EOF (#### sometimes; it may simply indicate we can't read
|
|
|
612 any data at other times, particularly if SIZE is too small. this needs
|
|
|
613 to be fixed!). -1 means an error occurred and no bytes were read. */
|
|
|
614
|
|
814
|
615 static Bytecount
|
|
|
616 Lstream_read_1 (Lstream *lstr, void *data, Bytecount size,
|
|
|
617 int override_no_partial_chars)
|
|
428
|
618 {
|
|
|
619 unsigned char *p = (unsigned char *) data;
|
|
665
|
620 Bytecount off = 0;
|
|
|
621 Bytecount chunk;
|
|
428
|
622 int error_occurred = 0;
|
|
|
623
|
|
|
624 if (size == 0)
|
|
|
625 return 0;
|
|
|
626
|
|
|
627 /* First try to get some data from the unget buffer */
|
|
|
628 chunk = min (size, lstr->unget_buffer_ind);
|
|
|
629 if (chunk > 0)
|
|
|
630 {
|
|
|
631 /* The bytes come back in reverse order. */
|
|
|
632 for (; off < chunk; off++)
|
|
|
633 p[off] = lstr->unget_buffer[--lstr->unget_buffer_ind];
|
|
|
634 lstr->byte_count += chunk;
|
|
|
635 size -= chunk;
|
|
|
636 }
|
|
|
637
|
|
|
638 while (size > 0)
|
|
|
639 {
|
|
771
|
640 /* If unbuffered, then simply read directly into output buffer.
|
|
|
641 No need to copy. */
|
|
|
642 if (lstr->buffering == LSTREAM_UNBUFFERED)
|
|
|
643 {
|
|
|
644 chunk = Lstream_raw_read (lstr, p + off, size);
|
|
|
645 if (chunk < 0)
|
|
|
646 error_occurred = 1;
|
|
|
647 if (chunk <= 0)
|
|
|
648 break;
|
|
|
649 lstr->byte_count += chunk;
|
|
428
|
650 size -= chunk;
|
|
771
|
651 off += chunk;
|
|
|
652 }
|
|
|
653 else
|
|
428
|
654 {
|
|
771
|
655 /* Take whatever we can from the in buffer */
|
|
|
656 chunk = min (size, lstr->in_buffer_current - lstr->in_buffer_ind);
|
|
|
657 if (chunk > 0)
|
|
|
658 {
|
|
|
659 memcpy (p + off, lstr->in_buffer + lstr->in_buffer_ind, chunk);
|
|
|
660 lstr->in_buffer_ind += chunk;
|
|
|
661 lstr->byte_count += chunk;
|
|
|
662 size -= chunk;
|
|
|
663 off += chunk;
|
|
|
664 }
|
|
|
665
|
|
|
666 /* If we need some more, try to get some more from the
|
|
|
667 stream's end */
|
|
|
668 if (size > 0)
|
|
|
669 {
|
|
|
670 Bytecount retval = Lstream_read_more (lstr);
|
|
|
671 if (retval < 0)
|
|
|
672 error_occurred = 1;
|
|
|
673 if (retval <= 0)
|
|
|
674 break;
|
|
|
675 }
|
|
428
|
676 }
|
|
|
677 }
|
|
|
678
|
|
814
|
679 if ((lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS) &&
|
|
|
680 !override_no_partial_chars)
|
|
428
|
681 {
|
|
|
682 /* It's quite possible for us to get passed an incomplete
|
|
|
683 character at the end. We need to spit back that
|
|
|
684 incomplete character. */
|
|
867
|
685 Bytecount newoff = validate_ibyte_string_backward (p, off);
|
|
771
|
686 if (newoff < off)
|
|
428
|
687 {
|
|
771
|
688 Lstream_unread (lstr, p + newoff, off - newoff);
|
|
|
689 off = newoff;
|
|
428
|
690 }
|
|
|
691 }
|
|
|
692
|
|
462
|
693 return off == 0 && error_occurred ? -1 : off;
|
|
428
|
694 }
|
|
|
695
|
|
814
|
696 Bytecount
|
|
|
697 Lstream_read (Lstream *lstr, void *data, Bytecount size)
|
|
|
698 {
|
|
|
699 return Lstream_read_1 (lstr, data, size, 0);
|
|
|
700 }
|
|
|
701
|
|
|
702
|
|
771
|
703 /* Push back SIZE bytes of DATA onto the input queue. The next call
|
|
|
704 to Lstream_read() with the same size will read the same bytes back.
|
|
|
705 Note that this will be the case even if there is other pending
|
|
|
706 unread data. */
|
|
|
707
|
|
428
|
708 void
|
|
665
|
709 Lstream_unread (Lstream *lstr, const void *data, Bytecount size)
|
|
428
|
710 {
|
|
442
|
711 const unsigned char *p = (const unsigned char *) data;
|
|
428
|
712
|
|
|
713 /* Make sure buffer is big enough */
|
|
|
714 DO_REALLOC (lstr->unget_buffer, lstr->unget_buffer_size,
|
|
|
715 lstr->unget_buffer_ind + size, unsigned char);
|
|
|
716
|
|
|
717 lstr->byte_count -= size;
|
|
|
718
|
|
|
719 /* Bytes have to go on in reverse order -- they are reversed
|
|
|
720 again when read back. */
|
|
|
721 while (size--)
|
|
|
722 lstr->unget_buffer[lstr->unget_buffer_ind++] = p[size];
|
|
|
723 }
|
|
|
724
|
|
771
|
725 /* Rewind the stream to the beginning. */
|
|
|
726
|
|
428
|
727 int
|
|
|
728 Lstream_rewind (Lstream *lstr)
|
|
|
729 {
|
|
|
730 if (!lstr->imp->rewinder)
|
|
|
731 Lstream_internal_error ("lstream has no rewinder", lstr);
|
|
|
732 if (Lstream_flush (lstr) < 0)
|
|
|
733 return -1;
|
|
|
734 lstr->byte_count = 0;
|
|
|
735 return (lstr->imp->rewinder) (lstr);
|
|
|
736 }
|
|
|
737
|
|
|
738 int
|
|
|
739 Lstream_seekable_p (Lstream *lstr)
|
|
|
740 {
|
|
|
741 if (!lstr->imp->rewinder)
|
|
|
742 return 0;
|
|
|
743 if (!lstr->imp->seekable_p)
|
|
|
744 return 1;
|
|
|
745 return (lstr->imp->seekable_p) (lstr);
|
|
|
746 }
|
|
|
747
|
|
|
748 static int
|
|
|
749 Lstream_pseudo_close (Lstream *lstr)
|
|
|
750 {
|
|
|
751 if (!lstr->flags & LSTREAM_FL_IS_OPEN)
|
|
|
752 Lstream_internal_error ("lstream is not open", lstr);
|
|
|
753
|
|
|
754 /* don't check errors here -- best not to risk file descriptor loss */
|
|
|
755 return Lstream_flush (lstr);
|
|
|
756 }
|
|
|
757
|
|
771
|
758 /* Close the stream. All data will be flushed out. If the stream is
|
|
|
759 already closed, nothing happens. Note that, even if all data has
|
|
|
760 already been flushed out, the act of closing a stream may generate more
|
|
|
761 data -- for example, if the stream implements some sort of conversion,
|
|
|
762 such as gzip, there may be special "end-data" that need to be written
|
|
|
763 out when the file is closed. */
|
|
|
764
|
|
428
|
765 int
|
|
|
766 Lstream_close (Lstream *lstr)
|
|
|
767 {
|
|
|
768 int rc = 0;
|
|
|
769
|
|
|
770 if (lstr->flags & LSTREAM_FL_IS_OPEN)
|
|
|
771 {
|
|
|
772 rc = Lstream_pseudo_close (lstr);
|
|
|
773 /*
|
|
|
774 * We used to return immediately if the closer method reported
|
|
|
775 * failure, leaving the stream open. But this is no good, for
|
|
|
776 * the following reasons.
|
|
|
777 *
|
|
|
778 * 1. The finalizer method used in GC makes no provision for
|
|
|
779 * failure, so we must not return without freeing buffer
|
|
|
780 * memory.
|
|
|
781 *
|
|
|
782 * 2. The closer method may have already freed some memory
|
|
|
783 * used for I/O in this stream. E.g. encoding_closer frees
|
|
|
784 * ENCODING_STREAM_DATA(stream)->runoff. If a writer method
|
|
|
785 * tries to use this buffer later, it will write into memory
|
|
|
786 * that may have been allocated elsewhere. Sometime later
|
|
|
787 * you will see a sign that says "Welcome to Crash City."
|
|
|
788 *
|
|
|
789 * 3. The closer can report failure if a flush fails in the
|
|
|
790 * other stream in a MULE encoding/decoding stream pair.
|
|
|
791 * The other stream in the pair is closed, but returning
|
|
|
792 * early leaves the current stream open. If we try to
|
|
|
793 * flush the current stream later, we will crash when the
|
|
|
794 * flusher notices that the other end stream is closed.
|
|
|
795 *
|
|
|
796 * So, we no longer abort the close if the closer method
|
|
|
797 * reports some kind of failure. We still report the failure
|
|
|
798 * to the caller.
|
|
|
799 */
|
|
|
800 if (lstr->imp->closer)
|
|
|
801 if ((lstr->imp->closer) (lstr) < 0)
|
|
|
802 rc = -1;
|
|
|
803 }
|
|
|
804
|
|
|
805 lstr->flags &= ~LSTREAM_FL_IS_OPEN;
|
|
|
806 lstr->byte_count = 0;
|
|
|
807 /* Note that Lstream_flush() reset all the buffer indices. That way,
|
|
|
808 the next call to Lstream_putc(), Lstream_getc(), or Lstream_ungetc()
|
|
|
809 on a closed stream will call into the function equivalents, which will
|
|
|
810 cause an error. */
|
|
|
811
|
|
|
812 /* We set the pointers to 0 so that we don't lose when this function
|
|
|
813 is called more than once on the same object */
|
|
|
814 if (lstr->out_buffer)
|
|
|
815 {
|
|
|
816 xfree (lstr->out_buffer);
|
|
|
817 lstr->out_buffer = 0;
|
|
|
818 }
|
|
|
819 if (lstr->in_buffer)
|
|
|
820 {
|
|
|
821 xfree (lstr->in_buffer);
|
|
|
822 lstr->in_buffer = 0;
|
|
|
823 }
|
|
|
824 if (lstr->unget_buffer)
|
|
|
825 {
|
|
|
826 xfree (lstr->unget_buffer);
|
|
|
827 lstr->unget_buffer = 0;
|
|
|
828 }
|
|
|
829
|
|
|
830 return rc;
|
|
|
831 }
|
|
|
832
|
|
771
|
833
|
|
|
834 /* Function equivalent of Lstream_putc(). */
|
|
|
835
|
|
428
|
836 int
|
|
|
837 Lstream_fputc (Lstream *lstr, int c)
|
|
|
838 {
|
|
|
839 unsigned char ch = (unsigned char) c;
|
|
771
|
840 int retval = Lstream_write_1 (lstr, &ch, 1);
|
|
|
841 if (retval == 0 && lstr->buffering == LSTREAM_LINE_BUFFERED && ch == '\n')
|
|
428
|
842 return Lstream_flush_out (lstr);
|
|
771
|
843 return retval;
|
|
428
|
844 }
|
|
|
845
|
|
771
|
846 /* Function equivalent of Lstream_getc(). */
|
|
|
847
|
|
428
|
848 int
|
|
|
849 Lstream_fgetc (Lstream *lstr)
|
|
|
850 {
|
|
|
851 unsigned char ch;
|
|
814
|
852 if (Lstream_read_1 (lstr, &ch, 1, 1) <= 0)
|
|
428
|
853 return -1;
|
|
|
854 return ch;
|
|
|
855 }
|
|
|
856
|
|
771
|
857 /* Function equivalent of Lstream_ungetc(). */
|
|
|
858
|
|
428
|
859 void
|
|
|
860 Lstream_fungetc (Lstream *lstr, int c)
|
|
|
861 {
|
|
|
862 unsigned char ch = (unsigned char) c;
|
|
|
863 Lstream_unread (lstr, &ch, 1);
|
|
|
864 }
|
|
|
865
|
|
|
866
|
|
|
867 /************************ some stream implementations *********************/
|
|
|
868
|
|
|
869 /*********** a stdio stream ***********/
|
|
|
870
|
|
|
871 struct stdio_stream
|
|
|
872 {
|
|
|
873 FILE *file;
|
|
|
874 int closing;
|
|
|
875 };
|
|
|
876
|
|
|
877 #define STDIO_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, stdio)
|
|
|
878
|
|
771
|
879 DEFINE_LSTREAM_IMPLEMENTATION ("stdio", stdio);
|
|
428
|
880
|
|
|
881 static Lisp_Object
|
|
442
|
882 make_stdio_stream_1 (FILE *stream, int flags, const char *mode)
|
|
428
|
883 {
|
|
|
884 Lstream *lstr = Lstream_new (lstream_stdio, mode);
|
|
|
885 struct stdio_stream *str = STDIO_STREAM_DATA (lstr);
|
|
|
886 str->file = stream;
|
|
|
887 str->closing = flags & LSTR_CLOSING;
|
|
|
888 lstr->flags |= LSTREAM_FL_CLOSE_AT_DISKSAVE;
|
|
793
|
889 return wrap_lstream (lstr);
|
|
428
|
890 }
|
|
|
891
|
|
|
892 Lisp_Object
|
|
|
893 make_stdio_input_stream (FILE *stream, int flags)
|
|
|
894 {
|
|
|
895 return make_stdio_stream_1 (stream, flags, "r");
|
|
|
896 }
|
|
|
897
|
|
|
898 Lisp_Object
|
|
|
899 make_stdio_output_stream (FILE *stream, int flags)
|
|
|
900 {
|
|
|
901 return make_stdio_stream_1 (stream, flags, "w");
|
|
|
902 }
|
|
|
903
|
|
|
904 /* #### From reading the Unix 98 specification, it appears that if we
|
|
|
905 want stdio_reader() to be completely correct, we should check for
|
|
|
906 0 < val < size and if so, check to see if an error has occurred.
|
|
|
907 If an error has occurred, but val is non-zero, we should go ahead
|
|
|
908 and act as if the read was successful, but remember in some fashion
|
|
|
909 or other, that an error has occurred, and report that on the next
|
|
771
|
910 call to stdio_reader instead of calling retry_fread() again.
|
|
428
|
911
|
|
771
|
912 Currently, in such a case, we end up calling retry_fread() twice and we
|
|
428
|
913 assume that
|
|
|
914
|
|
|
915 1) this is not harmful, and
|
|
|
916 2) the error will still be reported on the second read.
|
|
|
917
|
|
|
918 This is probably reasonable, so I don't think we should change this
|
|
|
919 code (it could even be argued that the error might have fixed
|
|
771
|
920 itself, so we should do the retry_fread() again. */
|
|
428
|
921
|
|
665
|
922 static Bytecount
|
|
|
923 stdio_reader (Lstream *stream, unsigned char *data, Bytecount size)
|
|
428
|
924 {
|
|
|
925 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
771
|
926 Bytecount val = retry_fread (data, 1, size, str->file);
|
|
|
927 if (!val)
|
|
|
928 {
|
|
|
929 if (ferror (str->file))
|
|
|
930 return LSTREAM_ERROR;
|
|
|
931 if (feof (str->file))
|
|
|
932 return 0; /* LSTREAM_EOF; */
|
|
|
933 }
|
|
428
|
934 return val;
|
|
|
935 }
|
|
|
936
|
|
665
|
937 static Bytecount
|
|
462
|
938 stdio_writer (Lstream *stream, const unsigned char *data,
|
|
665
|
939 Bytecount size)
|
|
428
|
940 {
|
|
|
941 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
771
|
942 Bytecount val = retry_fwrite (data, 1, size, str->file);
|
|
428
|
943 if (!val && ferror (str->file))
|
|
771
|
944 return LSTREAM_ERROR;
|
|
428
|
945 return val;
|
|
|
946 }
|
|
|
947
|
|
|
948 static int
|
|
|
949 stdio_rewinder (Lstream *stream)
|
|
|
950 {
|
|
|
951 rewind (STDIO_STREAM_DATA (stream)->file);
|
|
|
952 return 0;
|
|
|
953 }
|
|
|
954
|
|
|
955 static int
|
|
|
956 stdio_seekable_p (Lstream *stream)
|
|
|
957 {
|
|
|
958 struct stat lestat;
|
|
|
959 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
960
|
|
771
|
961 if (qxe_fstat (fileno (str->file), &lestat) < 0)
|
|
428
|
962 return 0;
|
|
|
963 return S_ISREG (lestat.st_mode);
|
|
|
964 }
|
|
|
965
|
|
|
966 static int
|
|
|
967 stdio_flusher (Lstream *stream)
|
|
|
968 {
|
|
|
969 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
970 if (stream->flags & LSTREAM_FL_WRITE)
|
|
|
971 return fflush (str->file);
|
|
|
972 else
|
|
|
973 return 0;
|
|
|
974 }
|
|
|
975
|
|
|
976 static int
|
|
|
977 stdio_closer (Lstream *stream)
|
|
|
978 {
|
|
|
979 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
980 if (str->closing)
|
|
771
|
981 return retry_fclose (str->file);
|
|
428
|
982 else
|
|
|
983 if (stream->flags & LSTREAM_FL_WRITE)
|
|
|
984 return fflush (str->file);
|
|
|
985 else
|
|
|
986 return 0;
|
|
|
987 }
|
|
|
988
|
|
|
989 /*********** a file descriptor ***********/
|
|
|
990
|
|
|
991 struct filedesc_stream
|
|
|
992 {
|
|
|
993 int fd;
|
|
|
994 int pty_max_bytes;
|
|
867
|
995 Ibyte eof_char;
|
|
428
|
996 int starting_pos;
|
|
|
997 int current_pos;
|
|
|
998 int end_pos;
|
|
|
999 int chars_sans_newline;
|
|
|
1000 unsigned int closing :1;
|
|
|
1001 unsigned int allow_quit :1;
|
|
|
1002 unsigned int blocked_ok :1;
|
|
|
1003 unsigned int pty_flushing :1;
|
|
|
1004 unsigned int blocking_error_p :1;
|
|
|
1005 };
|
|
|
1006
|
|
|
1007 #define FILEDESC_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, filedesc)
|
|
|
1008
|
|
771
|
1009 DEFINE_LSTREAM_IMPLEMENTATION ("filedesc", filedesc);
|
|
428
|
1010
|
|
|
1011 /* Make a stream that reads from or writes to a file descriptor FILEDESC.
|
|
|
1012 OFFSET is the offset from the *current* file pointer that the reading
|
|
|
1013 should start at. COUNT is the number of bytes to be read (it is
|
|
|
1014 ignored when writing); -1 for unlimited. */
|
|
|
1015 static Lisp_Object
|
|
|
1016 make_filedesc_stream_1 (int filedesc, int offset, int count, int flags,
|
|
442
|
1017 const char *mode)
|
|
428
|
1018 {
|
|
|
1019 Lstream *lstr = Lstream_new (lstream_filedesc, mode);
|
|
|
1020 struct filedesc_stream *fstr = FILEDESC_STREAM_DATA (lstr);
|
|
|
1021 fstr->fd = filedesc;
|
|
|
1022 fstr->closing = !!(flags & LSTR_CLOSING);
|
|
|
1023 fstr->allow_quit = !!(flags & LSTR_ALLOW_QUIT);
|
|
|
1024 fstr->blocked_ok = !!(flags & LSTR_BLOCKED_OK);
|
|
|
1025 fstr->pty_flushing = !!(flags & LSTR_PTY_FLUSHING);
|
|
|
1026 fstr->blocking_error_p = 0;
|
|
|
1027 fstr->chars_sans_newline = 0;
|
|
|
1028 fstr->starting_pos = lseek (filedesc, offset, SEEK_CUR);
|
|
|
1029 fstr->current_pos = max (fstr->starting_pos, 0);
|
|
|
1030 if (count < 0)
|
|
|
1031 fstr->end_pos = -1;
|
|
|
1032 else
|
|
|
1033 fstr->end_pos = fstr->starting_pos + count;
|
|
|
1034 lstr->flags |= LSTREAM_FL_CLOSE_AT_DISKSAVE;
|
|
793
|
1035 return wrap_lstream (lstr);
|
|
428
|
1036 }
|
|
|
1037
|
|
814
|
1038 /* Flags:
|
|
|
1039
|
|
|
1040 LSTR_CLOSING
|
|
|
1041 If set, close the descriptor or FILE * when the stream is closed.
|
|
|
1042
|
|
|
1043 LSTR_ALLOW_QUIT
|
|
|
1044 If set, allow quitting out of the actual I/O.
|
|
|
1045
|
|
|
1046 LSTR_PTY_FLUSHING
|
|
|
1047 If set and filedesc_stream_set_pty_flushing() has been called
|
|
|
1048 on the stream, do not send more than pty_max_bytes on a single
|
|
|
1049 line without flushing the data out using the eof_char.
|
|
|
1050
|
|
|
1051 LSTR_BLOCKED_OK
|
|
|
1052 If set, an EWOULDBLOCK error is not treated as an error but
|
|
|
1053 simply causes the write function to return 0 as the number
|
|
|
1054 of bytes written out.
|
|
|
1055 */
|
|
|
1056
|
|
428
|
1057 Lisp_Object
|
|
|
1058 make_filedesc_input_stream (int filedesc, int offset, int count, int flags)
|
|
|
1059 {
|
|
|
1060 return make_filedesc_stream_1 (filedesc, offset, count, flags, "r");
|
|
|
1061 }
|
|
|
1062
|
|
|
1063 Lisp_Object
|
|
|
1064 make_filedesc_output_stream (int filedesc, int offset, int count, int flags)
|
|
|
1065 {
|
|
|
1066 return make_filedesc_stream_1 (filedesc, offset, count, flags, "w");
|
|
|
1067 }
|
|
|
1068
|
|
665
|
1069 static Bytecount
|
|
|
1070 filedesc_reader (Lstream *stream, unsigned char *data, Bytecount size)
|
|
428
|
1071 {
|
|
665
|
1072 Bytecount nread;
|
|
428
|
1073 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1074 if (str->end_pos >= 0)
|
|
665
|
1075 size = min (size, (Bytecount) (str->end_pos - str->current_pos));
|
|
430
|
1076 nread = str->allow_quit ?
|
|
|
1077 read_allowing_quit (str->fd, data, size) :
|
|
771
|
1078 retry_read (str->fd, data, size);
|
|
428
|
1079 if (nread > 0)
|
|
|
1080 str->current_pos += nread;
|
|
771
|
1081 if (nread == 0)
|
|
|
1082 return 0; /* LSTREAM_EOF; */
|
|
|
1083 if (nread < 0)
|
|
|
1084 return LSTREAM_ERROR;
|
|
428
|
1085 return nread;
|
|
|
1086 }
|
|
|
1087
|
|
|
1088 static int
|
|
|
1089 errno_would_block_p (int val)
|
|
|
1090 {
|
|
|
1091 #ifdef EWOULDBLOCK
|
|
|
1092 if (val == EWOULDBLOCK)
|
|
|
1093 return 1;
|
|
|
1094 #endif
|
|
|
1095 #ifdef EAGAIN
|
|
|
1096 if (val == EAGAIN)
|
|
|
1097 return 1;
|
|
|
1098 #endif
|
|
|
1099 return 0;
|
|
|
1100 }
|
|
|
1101
|
|
665
|
1102 static Bytecount
|
|
462
|
1103 filedesc_writer (Lstream *stream, const unsigned char *data,
|
|
665
|
1104 Bytecount size)
|
|
428
|
1105 {
|
|
|
1106 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
665
|
1107 Bytecount retval;
|
|
428
|
1108 int need_newline = 0;
|
|
|
1109
|
|
|
1110 /* This function would be simple if it were not for the blasted
|
|
|
1111 PTY max-bytes stuff. Why the hell can't they just have written
|
|
|
1112 the PTY drivers right so this problem doesn't exist?
|
|
|
1113
|
|
|
1114 Maybe all the PTY crap here should be moved into another stream
|
|
|
1115 that does nothing but periodically insert EOF's as necessary. */
|
|
|
1116 if (str->pty_flushing)
|
|
|
1117 {
|
|
|
1118 /* To make life easy, only send out one line at the most. */
|
|
442
|
1119 const unsigned char *ptr;
|
|
428
|
1120
|
|
442
|
1121 ptr = (const unsigned char *) memchr (data, '\n', size);
|
|
428
|
1122 if (ptr)
|
|
|
1123 need_newline = 1;
|
|
|
1124 else
|
|
|
1125 ptr = data + size;
|
|
|
1126 if (ptr - data >= str->pty_max_bytes - str->chars_sans_newline)
|
|
|
1127 {
|
|
|
1128 ptr = data + str->pty_max_bytes - str->chars_sans_newline;
|
|
|
1129 need_newline = 0;
|
|
|
1130 }
|
|
|
1131 size = ptr - data;
|
|
|
1132 }
|
|
|
1133
|
|
|
1134 /**** start of non-PTY-crap ****/
|
|
|
1135 if (size > 0)
|
|
430
|
1136 retval = str->allow_quit ?
|
|
|
1137 write_allowing_quit (str->fd, data, size) :
|
|
771
|
1138 retry_write (str->fd, data, size);
|
|
428
|
1139 else
|
|
|
1140 retval = 0;
|
|
|
1141 if (retval < 0 && errno_would_block_p (errno) && str->blocked_ok)
|
|
|
1142 {
|
|
|
1143 str->blocking_error_p = 1;
|
|
|
1144 return 0;
|
|
|
1145 }
|
|
|
1146 str->blocking_error_p = 0;
|
|
|
1147 if (retval < 0)
|
|
771
|
1148 return LSTREAM_ERROR;
|
|
428
|
1149 /**** end non-PTY-crap ****/
|
|
|
1150
|
|
|
1151 if (str->pty_flushing)
|
|
|
1152 {
|
|
|
1153 str->chars_sans_newline += retval;
|
|
|
1154 /* Note that a newline was not among the bytes written out.
|
|
|
1155 Add to the number of non-newline bytes written out,
|
|
|
1156 and flush with an EOF if necessary. Be careful to
|
|
|
1157 keep track of write errors as we go along and look
|
|
|
1158 out for EWOULDBLOCK. */
|
|
|
1159 if (str->chars_sans_newline >= str->pty_max_bytes)
|
|
|
1160 {
|
|
665
|
1161 Bytecount retval2 = str->allow_quit ?
|
|
430
|
1162 write_allowing_quit (str->fd, &str->eof_char, 1) :
|
|
771
|
1163 retry_write (str->fd, &str->eof_char, 1);
|
|
430
|
1164
|
|
428
|
1165 if (retval2 > 0)
|
|
|
1166 str->chars_sans_newline = 0;
|
|
|
1167 else if (retval2 < 0)
|
|
|
1168 {
|
|
|
1169 /* Error writing the EOF char. If nothing got written,
|
|
|
1170 then treat this as an error -- either return an error
|
|
|
1171 condition or set the blocking-error flag. */
|
|
|
1172 if (retval == 0)
|
|
|
1173 {
|
|
|
1174 if (errno_would_block_p (errno) && str->blocked_ok)
|
|
|
1175 {
|
|
|
1176 str->blocking_error_p = 1;
|
|
|
1177 return 0;
|
|
|
1178 }
|
|
|
1179 else
|
|
771
|
1180 return LSTREAM_ERROR;
|
|
428
|
1181 }
|
|
|
1182 else
|
|
|
1183 return retval;
|
|
|
1184 }
|
|
|
1185 }
|
|
|
1186 }
|
|
|
1187
|
|
|
1188 /* The need_newline flag is necessary because otherwise when the
|
|
|
1189 first byte is a newline, we'd get stuck never writing anything
|
|
|
1190 in pty-flushing mode. */
|
|
|
1191 if (need_newline)
|
|
|
1192 {
|
|
867
|
1193 Ibyte nl = '\n';
|
|
665
|
1194 Bytecount retval2 = str->allow_quit ?
|
|
430
|
1195 write_allowing_quit (str->fd, &nl, 1) :
|
|
771
|
1196 retry_write (str->fd, &nl, 1);
|
|
430
|
1197
|
|
428
|
1198 if (retval2 > 0)
|
|
|
1199 {
|
|
|
1200 str->chars_sans_newline = 0;
|
|
|
1201 retval++;
|
|
|
1202 }
|
|
|
1203 else if (retval2 < 0)
|
|
|
1204 {
|
|
|
1205 /* Error writing the newline char. If nothing got written,
|
|
|
1206 then treat this as an error -- either return an error
|
|
|
1207 condition or set the blocking-error flag. */
|
|
|
1208 if (retval == 0)
|
|
|
1209 {
|
|
|
1210 if (errno_would_block_p (errno) && str->blocked_ok)
|
|
|
1211 {
|
|
|
1212 str->blocking_error_p = 1;
|
|
|
1213 return 0;
|
|
|
1214 }
|
|
|
1215 else
|
|
771
|
1216 return LSTREAM_ERROR;
|
|
428
|
1217 }
|
|
|
1218 else
|
|
|
1219 return retval;
|
|
|
1220 }
|
|
|
1221 }
|
|
|
1222
|
|
|
1223 return retval;
|
|
|
1224 }
|
|
|
1225
|
|
|
1226 static int
|
|
|
1227 filedesc_rewinder (Lstream *stream)
|
|
|
1228 {
|
|
|
1229 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1230 if (str->starting_pos < 0 ||
|
|
|
1231 lseek (FILEDESC_STREAM_DATA (stream)->fd, str->starting_pos,
|
|
|
1232 SEEK_SET) == -1)
|
|
|
1233 return -1;
|
|
|
1234 else
|
|
|
1235 {
|
|
|
1236 str->current_pos = str->starting_pos;
|
|
|
1237 return 0;
|
|
|
1238 }
|
|
|
1239 }
|
|
|
1240
|
|
|
1241 static int
|
|
|
1242 filedesc_seekable_p (Lstream *stream)
|
|
|
1243 {
|
|
|
1244 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1245 if (str->starting_pos < 0)
|
|
|
1246 return 0;
|
|
|
1247 else
|
|
|
1248 {
|
|
|
1249 struct stat lestat;
|
|
|
1250
|
|
771
|
1251 if (qxe_fstat (str->fd, &lestat) < 0)
|
|
428
|
1252 return 0;
|
|
|
1253 return S_ISREG (lestat.st_mode);
|
|
|
1254 }
|
|
|
1255 }
|
|
|
1256
|
|
|
1257 static int
|
|
|
1258 filedesc_closer (Lstream *stream)
|
|
|
1259 {
|
|
|
1260 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1261 if (str->closing)
|
|
771
|
1262 return retry_close (str->fd);
|
|
428
|
1263 else
|
|
|
1264 return 0;
|
|
|
1265 }
|
|
|
1266
|
|
|
1267 static int
|
|
|
1268 filedesc_was_blocked_p (Lstream *stream)
|
|
|
1269 {
|
|
|
1270 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1271 return str->blocking_error_p;
|
|
|
1272 }
|
|
|
1273
|
|
|
1274 void
|
|
|
1275 filedesc_stream_set_pty_flushing (Lstream *stream, int pty_max_bytes,
|
|
867
|
1276 Ibyte eof_char)
|
|
428
|
1277 {
|
|
|
1278 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1279 str->pty_max_bytes = pty_max_bytes;
|
|
|
1280 str->eof_char = eof_char;
|
|
|
1281 str->pty_flushing = 1;
|
|
|
1282 }
|
|
|
1283
|
|
|
1284 int
|
|
|
1285 filedesc_stream_fd (Lstream *stream)
|
|
|
1286 {
|
|
|
1287 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1288 return str->fd;
|
|
|
1289 }
|
|
|
1290
|
|
|
1291 /*********** read from a Lisp string ***********/
|
|
|
1292
|
|
|
1293 #define LISP_STRING_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, lisp_string)
|
|
|
1294
|
|
|
1295 struct lisp_string_stream
|
|
|
1296 {
|
|
|
1297 Lisp_Object obj;
|
|
|
1298 Bytecount init_offset;
|
|
|
1299 Bytecount offset, end;
|
|
|
1300 };
|
|
|
1301
|
|
771
|
1302 DEFINE_LSTREAM_IMPLEMENTATION ("lisp-string", lisp_string);
|
|
428
|
1303
|
|
|
1304 Lisp_Object
|
|
|
1305 make_lisp_string_input_stream (Lisp_Object string, Bytecount offset,
|
|
|
1306 Bytecount len)
|
|
|
1307 {
|
|
|
1308 Lstream *lstr;
|
|
|
1309 struct lisp_string_stream *str;
|
|
|
1310
|
|
|
1311 CHECK_STRING (string);
|
|
|
1312 if (len < 0)
|
|
|
1313 len = XSTRING_LENGTH (string) - offset;
|
|
|
1314 assert (offset >= 0);
|
|
|
1315 assert (len >= 0);
|
|
|
1316 assert (offset + len <= XSTRING_LENGTH (string));
|
|
|
1317
|
|
|
1318 lstr = Lstream_new (lstream_lisp_string, "r");
|
|
|
1319 str = LISP_STRING_STREAM_DATA (lstr);
|
|
|
1320 str->offset = offset;
|
|
|
1321 str->end = offset + len;
|
|
|
1322 str->init_offset = offset;
|
|
|
1323 str->obj = string;
|
|
793
|
1324 return wrap_lstream (lstr);
|
|
428
|
1325 }
|
|
|
1326
|
|
665
|
1327 static Bytecount
|
|
462
|
1328 lisp_string_reader (Lstream *stream, unsigned char *data,
|
|
665
|
1329 Bytecount size)
|
|
428
|
1330 {
|
|
|
1331 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream);
|
|
|
1332 /* Don't lose if the string shrank past us ... */
|
|
|
1333 Bytecount offset = min (str->offset, XSTRING_LENGTH (str->obj));
|
|
867
|
1334 Ibyte *strstart = XSTRING_DATA (str->obj);
|
|
|
1335 Ibyte *start = strstart + offset;
|
|
428
|
1336
|
|
|
1337 /* ... or if someone changed the string and we ended up in the
|
|
|
1338 middle of a character. */
|
|
|
1339 /* Being in the middle of a character is `normal' unless
|
|
|
1340 LSTREAM_NO_PARTIAL_CHARS - mrb */
|
|
|
1341 if (stream->flags & LSTREAM_FL_NO_PARTIAL_CHARS)
|
|
867
|
1342 VALIDATE_IBYTEPTR_BACKWARD (start);
|
|
428
|
1343 offset = start - strstart;
|
|
665
|
1344 size = min (size, (Bytecount) (str->end - offset));
|
|
428
|
1345 memcpy (data, start, size);
|
|
|
1346 str->offset = offset + size;
|
|
|
1347 return size;
|
|
|
1348 }
|
|
|
1349
|
|
|
1350 static int
|
|
|
1351 lisp_string_rewinder (Lstream *stream)
|
|
|
1352 {
|
|
|
1353 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream);
|
|
|
1354 int pos = str->init_offset;
|
|
|
1355 if (pos > str->end)
|
|
|
1356 pos = str->end;
|
|
|
1357 /* Don't lose if the string shrank past us ... */
|
|
|
1358 pos = min (pos, XSTRING_LENGTH (str->obj));
|
|
|
1359 /* ... or if someone changed the string and we ended up in the
|
|
|
1360 middle of a character. */
|
|
|
1361 {
|
|
867
|
1362 Ibyte *strstart = XSTRING_DATA (str->obj);
|
|
|
1363 Ibyte *start = strstart + pos;
|
|
|
1364 VALIDATE_IBYTEPTR_BACKWARD (start);
|
|
428
|
1365 pos = start - strstart;
|
|
|
1366 }
|
|
|
1367 str->offset = pos;
|
|
|
1368 return 0;
|
|
|
1369 }
|
|
|
1370
|
|
|
1371 static Lisp_Object
|
|
|
1372 lisp_string_marker (Lisp_Object stream)
|
|
|
1373 {
|
|
|
1374 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (XLSTREAM (stream));
|
|
|
1375 return str->obj;
|
|
|
1376 }
|
|
|
1377
|
|
|
1378 /*********** a fixed buffer ***********/
|
|
|
1379
|
|
|
1380 #define FIXED_BUFFER_STREAM_DATA(stream) \
|
|
|
1381 LSTREAM_TYPE_DATA (stream, fixed_buffer)
|
|
|
1382
|
|
|
1383 struct fixed_buffer_stream
|
|
|
1384 {
|
|
442
|
1385 const unsigned char *inbuf;
|
|
428
|
1386 unsigned char *outbuf;
|
|
665
|
1387 Bytecount size;
|
|
|
1388 Bytecount offset;
|
|
428
|
1389 };
|
|
|
1390
|
|
771
|
1391 DEFINE_LSTREAM_IMPLEMENTATION ("fixed-buffer", fixed_buffer);
|
|
428
|
1392
|
|
|
1393 Lisp_Object
|
|
665
|
1394 make_fixed_buffer_input_stream (const void *buf, Bytecount size)
|
|
428
|
1395 {
|
|
|
1396 Lstream *lstr = Lstream_new (lstream_fixed_buffer, "r");
|
|
|
1397 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (lstr);
|
|
440
|
1398 str->inbuf = (const unsigned char *) buf;
|
|
428
|
1399 str->size = size;
|
|
793
|
1400 return wrap_lstream (lstr);
|
|
428
|
1401 }
|
|
|
1402
|
|
|
1403 Lisp_Object
|
|
665
|
1404 make_fixed_buffer_output_stream (void *buf, Bytecount size)
|
|
428
|
1405 {
|
|
|
1406 Lstream *lstr = Lstream_new (lstream_fixed_buffer, "w");
|
|
|
1407 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (lstr);
|
|
440
|
1408 str->outbuf = (unsigned char *) buf;
|
|
428
|
1409 str->size = size;
|
|
793
|
1410 return wrap_lstream (lstr);
|
|
428
|
1411 }
|
|
|
1412
|
|
665
|
1413 static Bytecount
|
|
462
|
1414 fixed_buffer_reader (Lstream *stream, unsigned char *data,
|
|
665
|
1415 Bytecount size)
|
|
428
|
1416 {
|
|
|
1417 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (stream);
|
|
|
1418 size = min (size, str->size - str->offset);
|
|
|
1419 memcpy (data, str->inbuf + str->offset, size);
|
|
|
1420 str->offset += size;
|
|
|
1421 return size;
|
|
|
1422 }
|
|
|
1423
|
|
665
|
1424 static Bytecount
|
|
462
|
1425 fixed_buffer_writer (Lstream *stream, const unsigned char *data,
|
|
665
|
1426 Bytecount size)
|
|
428
|
1427 {
|
|
|
1428 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (stream);
|
|
|
1429 if (str->offset == str->size)
|
|
|
1430 {
|
|
|
1431 /* If we're at the end, just throw away the data and pretend
|
|
|
1432 we wrote all of it. If we return 0, then the lstream routines
|
|
|
1433 will try again and again to write it out. */
|
|
|
1434 return size;
|
|
|
1435 }
|
|
|
1436 size = min (size, str->size - str->offset);
|
|
|
1437 memcpy (str->outbuf + str->offset, data, size);
|
|
|
1438 str->offset += size;
|
|
|
1439 return size;
|
|
|
1440 }
|
|
|
1441
|
|
|
1442 static int
|
|
|
1443 fixed_buffer_rewinder (Lstream *stream)
|
|
|
1444 {
|
|
|
1445 FIXED_BUFFER_STREAM_DATA (stream)->offset = 0;
|
|
|
1446 return 0;
|
|
|
1447 }
|
|
|
1448
|
|
442
|
1449 const unsigned char *
|
|
428
|
1450 fixed_buffer_input_stream_ptr (Lstream *stream)
|
|
|
1451 {
|
|
|
1452 assert (stream->imp == lstream_fixed_buffer);
|
|
|
1453 return FIXED_BUFFER_STREAM_DATA (stream)->inbuf;
|
|
|
1454 }
|
|
|
1455
|
|
|
1456 unsigned char *
|
|
|
1457 fixed_buffer_output_stream_ptr (Lstream *stream)
|
|
|
1458 {
|
|
|
1459 assert (stream->imp == lstream_fixed_buffer);
|
|
|
1460 return FIXED_BUFFER_STREAM_DATA (stream)->outbuf;
|
|
|
1461 }
|
|
|
1462
|
|
|
1463 /*********** write to a resizing buffer ***********/
|
|
|
1464
|
|
|
1465 #define RESIZING_BUFFER_STREAM_DATA(stream) \
|
|
|
1466 LSTREAM_TYPE_DATA (stream, resizing_buffer)
|
|
|
1467
|
|
|
1468 struct resizing_buffer_stream
|
|
|
1469 {
|
|
|
1470 unsigned char *buf;
|
|
665
|
1471 Bytecount allocked;
|
|
428
|
1472 int max_stored;
|
|
|
1473 int stored;
|
|
|
1474 };
|
|
|
1475
|
|
771
|
1476 DEFINE_LSTREAM_IMPLEMENTATION ("resizing-buffer", resizing_buffer);
|
|
428
|
1477
|
|
|
1478 Lisp_Object
|
|
|
1479 make_resizing_buffer_output_stream (void)
|
|
|
1480 {
|
|
793
|
1481 return wrap_lstream (Lstream_new (lstream_resizing_buffer, "w"));
|
|
428
|
1482 }
|
|
|
1483
|
|
665
|
1484 static Bytecount
|
|
462
|
1485 resizing_buffer_writer (Lstream *stream, const unsigned char *data,
|
|
665
|
1486 Bytecount size)
|
|
428
|
1487 {
|
|
|
1488 struct resizing_buffer_stream *str = RESIZING_BUFFER_STREAM_DATA (stream);
|
|
|
1489 DO_REALLOC (str->buf, str->allocked, str->stored + size, unsigned char);
|
|
|
1490 memcpy (str->buf + str->stored, data, size);
|
|
|
1491 str->stored += size;
|
|
|
1492 str->max_stored = max (str->max_stored, str->stored);
|
|
|
1493 return size;
|
|
|
1494 }
|
|
|
1495
|
|
|
1496 static int
|
|
|
1497 resizing_buffer_rewinder (Lstream *stream)
|
|
|
1498 {
|
|
|
1499 RESIZING_BUFFER_STREAM_DATA (stream)->stored = 0;
|
|
|
1500 return 0;
|
|
|
1501 }
|
|
|
1502
|
|
|
1503 static int
|
|
|
1504 resizing_buffer_closer (Lstream *stream)
|
|
|
1505 {
|
|
|
1506 struct resizing_buffer_stream *str = RESIZING_BUFFER_STREAM_DATA (stream);
|
|
|
1507 if (str->buf)
|
|
|
1508 {
|
|
|
1509 xfree (str->buf);
|
|
|
1510 str->buf = 0;
|
|
|
1511 }
|
|
|
1512 return 0;
|
|
|
1513 }
|
|
|
1514
|
|
|
1515 unsigned char *
|
|
|
1516 resizing_buffer_stream_ptr (Lstream *stream)
|
|
|
1517 {
|
|
|
1518 return RESIZING_BUFFER_STREAM_DATA (stream)->buf;
|
|
|
1519 }
|
|
|
1520
|
|
788
|
1521 Lisp_Object
|
|
|
1522 resizing_buffer_to_lisp_string (Lstream *stream)
|
|
|
1523 {
|
|
|
1524 return make_string (resizing_buffer_stream_ptr (stream),
|
|
|
1525 Lstream_byte_count (stream));
|
|
|
1526 }
|
|
|
1527
|
|
428
|
1528 /*********** write to an unsigned-char dynarr ***********/
|
|
|
1529
|
|
|
1530 /* Note: If you have a dynarr whose type is not unsigned_char_dynarr
|
|
|
1531 but which is really just an unsigned_char_dynarr (e.g. its type
|
|
867
|
1532 is Ibyte or Extbyte), just cast to unsigned_char_dynarr. */
|
|
428
|
1533
|
|
|
1534 #define DYNARR_STREAM_DATA(stream) \
|
|
|
1535 LSTREAM_TYPE_DATA (stream, dynarr)
|
|
|
1536
|
|
|
1537 struct dynarr_stream
|
|
|
1538 {
|
|
|
1539 unsigned_char_dynarr *dyn;
|
|
|
1540 };
|
|
|
1541
|
|
771
|
1542 DEFINE_LSTREAM_IMPLEMENTATION ("dynarr", dynarr);
|
|
428
|
1543
|
|
|
1544 Lisp_Object
|
|
|
1545 make_dynarr_output_stream (unsigned_char_dynarr *dyn)
|
|
|
1546 {
|
|
793
|
1547 Lisp_Object obj = wrap_lstream (Lstream_new (lstream_dynarr, "w"));
|
|
|
1548
|
|
428
|
1549 DYNARR_STREAM_DATA (XLSTREAM (obj))->dyn = dyn;
|
|
|
1550 return obj;
|
|
|
1551 }
|
|
|
1552
|
|
665
|
1553 static Bytecount
|
|
462
|
1554 dynarr_writer (Lstream *stream, const unsigned char *data,
|
|
665
|
1555 Bytecount size)
|
|
428
|
1556 {
|
|
|
1557 struct dynarr_stream *str = DYNARR_STREAM_DATA (stream);
|
|
|
1558 Dynarr_add_many (str->dyn, data, size);
|
|
|
1559 return size;
|
|
|
1560 }
|
|
|
1561
|
|
|
1562 static int
|
|
|
1563 dynarr_rewinder (Lstream *stream)
|
|
|
1564 {
|
|
|
1565 Dynarr_reset (DYNARR_STREAM_DATA (stream)->dyn);
|
|
|
1566 return 0;
|
|
|
1567 }
|
|
|
1568
|
|
|
1569 static int
|
|
|
1570 dynarr_closer (Lstream *stream)
|
|
|
1571 {
|
|
|
1572 return 0;
|
|
|
1573 }
|
|
|
1574
|
|
|
1575 /************ read from or write to a Lisp buffer ************/
|
|
|
1576
|
|
|
1577 /* Note: Lisp-buffer read streams never return partial characters,
|
|
|
1578 and Lisp-buffer write streams expect to never get partial
|
|
|
1579 characters. */
|
|
|
1580
|
|
|
1581 #define LISP_BUFFER_STREAM_DATA(stream) \
|
|
|
1582 LSTREAM_TYPE_DATA (stream, lisp_buffer)
|
|
|
1583
|
|
|
1584 struct lisp_buffer_stream
|
|
|
1585 {
|
|
|
1586 Lisp_Object buffer;
|
|
|
1587 Lisp_Object orig_start;
|
|
|
1588 /* we use markers to properly deal with insertion/deletion */
|
|
|
1589 Lisp_Object start, end;
|
|
|
1590 int flags;
|
|
|
1591 };
|
|
|
1592
|
|
771
|
1593 DEFINE_LSTREAM_IMPLEMENTATION ("lisp-buffer", lisp_buffer);
|
|
428
|
1594
|
|
|
1595 static Lisp_Object
|
|
665
|
1596 make_lisp_buffer_stream_1 (struct buffer *buf, Charbpos start, Charbpos end,
|
|
826
|
1597 int flags, const Char_ASCII *mode)
|
|
428
|
1598 {
|
|
|
1599 Lstream *lstr;
|
|
|
1600 struct lisp_buffer_stream *str;
|
|
665
|
1601 Charbpos bmin, bmax;
|
|
428
|
1602 int reading = !strcmp (mode, "r");
|
|
|
1603
|
|
|
1604 /* Make sure the luser didn't pass "w" in. */
|
|
|
1605 if (!strcmp (mode, "w"))
|
|
|
1606 abort ();
|
|
|
1607
|
|
|
1608 if (flags & LSTR_IGNORE_ACCESSIBLE)
|
|
|
1609 {
|
|
|
1610 bmin = BUF_BEG (buf);
|
|
|
1611 bmax = BUF_Z (buf);
|
|
|
1612 }
|
|
|
1613 else
|
|
|
1614 {
|
|
|
1615 bmin = BUF_BEGV (buf);
|
|
|
1616 bmax = BUF_ZV (buf);
|
|
|
1617 }
|
|
|
1618
|
|
|
1619 if (start == -1)
|
|
|
1620 start = bmin;
|
|
|
1621 if (end == -1)
|
|
|
1622 end = bmax;
|
|
|
1623 assert (bmin <= start);
|
|
|
1624 assert (start <= bmax);
|
|
|
1625 if (reading)
|
|
|
1626 {
|
|
|
1627 assert (bmin <= end);
|
|
|
1628 assert (end <= bmax);
|
|
|
1629 assert (start <= end);
|
|
|
1630 }
|
|
|
1631
|
|
|
1632 lstr = Lstream_new (lstream_lisp_buffer, mode);
|
|
|
1633 str = LISP_BUFFER_STREAM_DATA (lstr);
|
|
|
1634 {
|
|
|
1635 Lisp_Object marker;
|
|
793
|
1636 Lisp_Object buffer = wrap_buffer (buf);
|
|
428
|
1637
|
|
|
1638 marker = Fmake_marker ();
|
|
|
1639 Fset_marker (marker, make_int (start), buffer);
|
|
|
1640 str->start = marker;
|
|
|
1641 marker = Fmake_marker ();
|
|
|
1642 Fset_marker (marker, make_int (start), buffer);
|
|
|
1643 str->orig_start = marker;
|
|
|
1644 if (reading)
|
|
|
1645 {
|
|
|
1646 marker = Fmake_marker ();
|
|
|
1647 Fset_marker (marker, make_int (end), buffer);
|
|
|
1648 str->end = marker;
|
|
|
1649 }
|
|
|
1650 else
|
|
|
1651 str->end = Qnil;
|
|
|
1652 str->buffer = buffer;
|
|
|
1653 }
|
|
|
1654 str->flags = flags;
|
|
793
|
1655 return wrap_lstream (lstr);
|
|
428
|
1656 }
|
|
|
1657
|
|
|
1658 Lisp_Object
|
|
826
|
1659 make_lisp_buffer_input_stream (struct buffer *buf, Charbpos start,
|
|
|
1660 Charbpos end, int flags)
|
|
428
|
1661 {
|
|
|
1662 return make_lisp_buffer_stream_1 (buf, start, end, flags, "r");
|
|
|
1663 }
|
|
|
1664
|
|
|
1665 Lisp_Object
|
|
665
|
1666 make_lisp_buffer_output_stream (struct buffer *buf, Charbpos pos, int flags)
|
|
428
|
1667 {
|
|
|
1668 Lisp_Object lstr = make_lisp_buffer_stream_1 (buf, pos, 0, flags, "wc");
|
|
|
1669
|
|
|
1670 Lstream_set_character_mode (XLSTREAM (lstr));
|
|
|
1671 return lstr;
|
|
|
1672 }
|
|
|
1673
|
|
665
|
1674 static Bytecount
|
|
867
|
1675 lisp_buffer_reader (Lstream *stream, Ibyte *data, Bytecount size)
|
|
428
|
1676 {
|
|
|
1677 struct lisp_buffer_stream *str = LISP_BUFFER_STREAM_DATA (stream);
|
|
665
|
1678 Bytebpos start;
|
|
|
1679 Bytebpos end;
|
|
428
|
1680 struct buffer *buf = XBUFFER (str->buffer);
|
|
826
|
1681 Bytecount src_used;
|
|
428
|
1682
|
|
|
1683 if (!BUFFER_LIVE_P (buf))
|
|
|
1684 return 0; /* Fut. */
|
|
|
1685
|
|
826
|
1686 start = byte_marker_position (str->start);
|
|
|
1687 end = byte_marker_position (str->end);
|
|
428
|
1688 if (!(str->flags & LSTR_IGNORE_ACCESSIBLE))
|
|
|
1689 {
|
|
826
|
1690 start = bytebpos_clip_to_bounds (BYTE_BUF_BEGV (buf), start,
|
|
|
1691 BYTE_BUF_ZV (buf));
|
|
|
1692 end = bytebpos_clip_to_bounds (BYTE_BUF_BEGV (buf), end,
|
|
|
1693 BYTE_BUF_ZV (buf));
|
|
428
|
1694 }
|
|
|
1695
|
|
826
|
1696 size = copy_buffer_text_out (buf, start, end - start, data, size,
|
|
|
1697 FORMAT_DEFAULT, Qnil, &src_used);
|
|
|
1698 end = start + src_used;
|
|
428
|
1699
|
|
|
1700 if (EQ (buf->selective_display, Qt) && str->flags & LSTR_SELECTIVE)
|
|
|
1701 {
|
|
|
1702 /* What a kludge. What a kludge. What a kludge. */
|
|
867
|
1703 Ibyte *p;
|
|
840
|
1704 for (p = data; p < data + src_used; p++)
|
|
428
|
1705 if (*p == '\r')
|
|
|
1706 *p = '\n';
|
|
|
1707 }
|
|
|
1708
|
|
826
|
1709 set_byte_marker_position (str->start, end);
|
|
|
1710 return size;
|
|
428
|
1711 }
|
|
|
1712
|
|
665
|
1713 static Bytecount
|
|
867
|
1714 lisp_buffer_writer (Lstream *stream, const Ibyte *data,
|
|
665
|
1715 Bytecount size)
|
|
428
|
1716 {
|
|
|
1717 struct lisp_buffer_stream *str = LISP_BUFFER_STREAM_DATA (stream);
|
|
665
|
1718 Charbpos pos;
|
|
428
|
1719 struct buffer *buf = XBUFFER (str->buffer);
|
|
|
1720
|
|
|
1721 if (!BUFFER_LIVE_P (buf))
|
|
|
1722 return 0; /* Fut. */
|
|
|
1723
|
|
|
1724 pos = marker_position (str->start);
|
|
|
1725 pos += buffer_insert_raw_string_1 (buf, pos, data, size, 0);
|
|
|
1726 set_marker_position (str->start, pos);
|
|
|
1727 return size;
|
|
|
1728 }
|
|
|
1729
|
|
|
1730 static int
|
|
|
1731 lisp_buffer_rewinder (Lstream *stream)
|
|
|
1732 {
|
|
|
1733 struct lisp_buffer_stream *str =
|
|
|
1734 LISP_BUFFER_STREAM_DATA (stream);
|
|
|
1735 struct buffer *buf = XBUFFER (str->buffer);
|
|
|
1736 long pos = marker_position (str->orig_start);
|
|
|
1737 if (!BUFFER_LIVE_P (buf))
|
|
|
1738 return -1; /* Fut. */
|
|
|
1739 if (pos > BUF_ZV (buf))
|
|
|
1740 pos = BUF_ZV (buf);
|
|
|
1741 if (pos < marker_position (str->orig_start))
|
|
|
1742 pos = marker_position (str->orig_start);
|
|
|
1743 if (MARKERP (str->end) && pos > marker_position (str->end))
|
|
|
1744 pos = marker_position (str->end);
|
|
|
1745 set_marker_position (str->start, pos);
|
|
|
1746 return 0;
|
|
|
1747 }
|
|
|
1748
|
|
|
1749 static Lisp_Object
|
|
|
1750 lisp_buffer_marker (Lisp_Object stream)
|
|
|
1751 {
|
|
|
1752 struct lisp_buffer_stream *str =
|
|
|
1753 LISP_BUFFER_STREAM_DATA (XLSTREAM (stream));
|
|
|
1754
|
|
|
1755 mark_object (str->start);
|
|
|
1756 mark_object (str->end);
|
|
|
1757 return str->buffer;
|
|
|
1758 }
|
|
|
1759
|
|
665
|
1760 Charbpos
|
|
428
|
1761 lisp_buffer_stream_startpos (Lstream *stream)
|
|
|
1762 {
|
|
|
1763 return marker_position (LISP_BUFFER_STREAM_DATA (stream)->start);
|
|
|
1764 }
|
|
|
1765
|
|
|
1766
|
|
|
1767 /************************************************************************/
|
|
|
1768 /* initialization */
|
|
|
1769 /************************************************************************/
|
|
|
1770
|
|
|
1771 void
|
|
|
1772 lstream_type_create (void)
|
|
|
1773 {
|
|
|
1774 LSTREAM_HAS_METHOD (stdio, reader);
|
|
|
1775 LSTREAM_HAS_METHOD (stdio, writer);
|
|
|
1776 LSTREAM_HAS_METHOD (stdio, rewinder);
|
|
|
1777 LSTREAM_HAS_METHOD (stdio, seekable_p);
|
|
|
1778 LSTREAM_HAS_METHOD (stdio, flusher);
|
|
|
1779 LSTREAM_HAS_METHOD (stdio, closer);
|
|
|
1780
|
|
|
1781 LSTREAM_HAS_METHOD (filedesc, reader);
|
|
|
1782 LSTREAM_HAS_METHOD (filedesc, writer);
|
|
|
1783 LSTREAM_HAS_METHOD (filedesc, was_blocked_p);
|
|
|
1784 LSTREAM_HAS_METHOD (filedesc, rewinder);
|
|
|
1785 LSTREAM_HAS_METHOD (filedesc, seekable_p);
|
|
|
1786 LSTREAM_HAS_METHOD (filedesc, closer);
|
|
|
1787
|
|
|
1788 LSTREAM_HAS_METHOD (lisp_string, reader);
|
|
|
1789 LSTREAM_HAS_METHOD (lisp_string, rewinder);
|
|
|
1790 LSTREAM_HAS_METHOD (lisp_string, marker);
|
|
|
1791
|
|
|
1792 LSTREAM_HAS_METHOD (fixed_buffer, reader);
|
|
|
1793 LSTREAM_HAS_METHOD (fixed_buffer, writer);
|
|
|
1794 LSTREAM_HAS_METHOD (fixed_buffer, rewinder);
|
|
|
1795
|
|
|
1796 LSTREAM_HAS_METHOD (resizing_buffer, writer);
|
|
|
1797 LSTREAM_HAS_METHOD (resizing_buffer, rewinder);
|
|
|
1798 LSTREAM_HAS_METHOD (resizing_buffer, closer);
|
|
|
1799
|
|
|
1800 LSTREAM_HAS_METHOD (dynarr, writer);
|
|
|
1801 LSTREAM_HAS_METHOD (dynarr, rewinder);
|
|
|
1802 LSTREAM_HAS_METHOD (dynarr, closer);
|
|
|
1803
|
|
|
1804 LSTREAM_HAS_METHOD (lisp_buffer, reader);
|
|
|
1805 LSTREAM_HAS_METHOD (lisp_buffer, writer);
|
|
|
1806 LSTREAM_HAS_METHOD (lisp_buffer, rewinder);
|
|
|
1807 LSTREAM_HAS_METHOD (lisp_buffer, marker);
|
|
|
1808 }
|
|
|
1809
|
|
|
1810 void
|
|
|
1811 reinit_vars_of_lstream (void)
|
|
|
1812 {
|
|
|
1813 int i;
|
|
|
1814
|
|
|
1815 for (i = 0; i < countof (Vlstream_free_list); i++)
|
|
|
1816 {
|
|
|
1817 Vlstream_free_list[i] = Qnil;
|
|
|
1818 staticpro_nodump (&Vlstream_free_list[i]);
|
|
|
1819 }
|
|
|
1820 }
|
|
|
1821
|
|
|
1822 void
|
|
|
1823 vars_of_lstream (void)
|
|
|
1824 {
|
|
442
|
1825 INIT_LRECORD_IMPLEMENTATION (lstream);
|
|
|
1826
|
|
428
|
1827 reinit_vars_of_lstream ();
|
|
|
1828 }
|
