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