|
428
|
1 /* Generic stream implementation -- header file.
|
|
|
2 Copyright (C) 1995 Free Software Foundation, Inc.
|
|
788
|
3 Copyright (C) 1996, 2001, 2002 Ben Wing.
|
|
428
|
4
|
|
|
5 This file is part of XEmacs.
|
|
|
6
|
|
|
7 XEmacs is free software; you can redistribute it and/or modify it
|
|
|
8 under the terms of the GNU General Public License as published by the
|
|
|
9 Free Software Foundation; either version 2, or (at your option) any
|
|
|
10 later version.
|
|
|
11
|
|
|
12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
|
|
|
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
|
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
|
15 for more details.
|
|
|
16
|
|
|
17 You should have received a copy of the GNU General Public License
|
|
|
18 along with XEmacs; see the file COPYING. If not, write to
|
|
|
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
|
20 Boston, MA 02111-1307, USA. */
|
|
|
21
|
|
|
22 /* Synched up with: Not in FSF. */
|
|
|
23
|
|
|
24 /* Written by Ben Wing. */
|
|
|
25
|
|
440
|
26 #ifndef INCLUDED_lstream_h_
|
|
|
27 #define INCLUDED_lstream_h_
|
|
428
|
28
|
|
|
29 /************************************************************************/
|
|
|
30 /* definition of Lstream object */
|
|
|
31 /************************************************************************/
|
|
|
32
|
|
|
33 DECLARE_LRECORD (lstream, struct lstream);
|
|
|
34 #define XLSTREAM(x) XRECORD (x, lstream, struct lstream)
|
|
617
|
35 #define wrap_lstream(p) wrap_record (p, lstream)
|
|
428
|
36 #define LSTREAMP(x) RECORDP (x, lstream)
|
|
|
37 /* #define CHECK_LSTREAM(x) CHECK_RECORD (x, lstream)
|
|
|
38 Lstream pointers should never escape to the Lisp level, so
|
|
|
39 functions should not be doing this. */
|
|
|
40
|
|
|
41 #ifndef EOF
|
|
|
42 #define EOF (-1)
|
|
|
43 #endif
|
|
|
44
|
|
771
|
45 /* There have been some arguments over the what the type should be that
|
|
665
|
46 specifies a count of bytes in a data block to be written out or read in,
|
|
|
47 using Lstream_read(), Lstream_write(), and related functions.
|
|
|
48 Originally it was long, which worked fine; Martin "corrected" these to
|
|
|
49 size_t and ssize_t on the grounds that this is theoretically cleaner and
|
|
|
50 is in keeping with the C standards. Unfortunately, this practice is
|
|
|
51 horribly error-prone due to design flaws in the way that mixed
|
|
|
52 signed/unsigned arithmetic happens. In fact, by doing this change,
|
|
|
53 Martin introduced a subtle but fatal error that caused the operation of
|
|
|
54 sending large mail messages to the SMTP server under Windows to fail.
|
|
|
55 By putting all values back to be signed, avoiding any signed/unsigned
|
|
|
56 mixing, the bug immediately went away. The type then in use was
|
|
|
57 Lstream_Data_Count, so that it be reverted cleanly if a vote came to
|
|
|
58 that. Now it is Bytecount.
|
|
|
59
|
|
|
60 Some earlier comments about why the type must be signed: This MUST BE
|
|
|
61 SIGNED, since it also is used in functions that return the number of
|
|
|
62 bytes actually read to or written from in an operation, and these
|
|
|
63 functions can return -1 to signal error.
|
|
462
|
64
|
|
|
65 Note that the standard Unix read() and write() functions define the
|
|
|
66 count going in as a size_t, which is UNSIGNED, and the count going
|
|
|
67 out as an ssize_t, which is SIGNED. This is a horrible design
|
|
|
68 flaw. Not only is it highly likely to lead to logic errors when a
|
|
|
69 -1 gets interpreted as a large positive number, but operations are
|
|
|
70 bound to fail in all sorts of horrible ways when a number in the
|
|
|
71 upper-half of the size_t range is passed in -- this number is
|
|
|
72 unrepresentable as an ssize_t, so code that checks to see how many
|
|
|
73 bytes are actually written (which is mandatory if you are dealing
|
|
|
74 with certain types of devices) will get completely screwed up.
|
|
771
|
75
|
|
665
|
76 --ben
|
|
462
|
77 */
|
|
428
|
78 typedef enum lstream_buffering
|
|
|
79 {
|
|
|
80 /* No buffering. */
|
|
|
81 LSTREAM_UNBUFFERED,
|
|
|
82 /* Buffer until a '\n' character is reached. */
|
|
|
83 LSTREAM_LINE_BUFFERED,
|
|
|
84 /* Buffer in standard-size (i.e. 512-byte) blocks. */
|
|
|
85 LSTREAM_BLOCK_BUFFERED,
|
|
|
86 /* Buffer in blocks of a specified size. */
|
|
|
87 LSTREAM_BLOCKN_BUFFERED,
|
|
|
88 /* Buffer until the stream is closed (only applies to write-only
|
|
|
89 streams). Only one call to the stream writer will be made,
|
|
|
90 and that is when the stream is closed. */
|
|
|
91 LSTREAM_UNLIMITED
|
|
|
92 } Lstream_buffering;
|
|
|
93
|
|
771
|
94 #if 0
|
|
|
95
|
|
|
96 /* #### not currently implemented; correct EOF handling is quite tricky
|
|
|
97 in the presence of various levels of filtering streams, and simply
|
|
|
98 interpreting 0 as EOF works fairly well as long as the amount of
|
|
|
99 data you're attempting to read is large and you know whether the
|
|
|
100 source stream at the end of the chain is a pipe (or other blocking
|
|
|
101 source) or not. we really should fix this, though. */
|
|
|
102
|
|
|
103 /* Return values from Lstream_read(). We do NOT use the C lib trick
|
|
|
104 of returning 0 to maybe indicate EOF because that is simply too
|
|
|
105 random and error-prone. It is quite legitimate for there to be no
|
|
|
106 data available but no EOF, even when not in the presence of
|
|
|
107 non-blocking I/O. For example, decoding/encoding streams (and in
|
|
|
108 general, any type of filtering stream) may only be able to return
|
|
|
109 data after a certain amount of data on the other end is
|
|
|
110 available. */
|
|
|
111
|
|
|
112 #define LSTREAM_EOF -2
|
|
|
113
|
|
|
114 #endif /* 0 */
|
|
|
115
|
|
|
116 #define LSTREAM_ERROR -1
|
|
|
117
|
|
428
|
118 /* Methods defining how this stream works. Some may be undefined. */
|
|
|
119
|
|
|
120 /* We do not implement the seek/tell paradigm. I tried to do that,
|
|
|
121 but getting the semantics right in the presence of buffering is
|
|
|
122 extremely tricky and very error-prone and basically not worth it.
|
|
|
123 This is especially the case with complicated streams like
|
|
|
124 decoding streams -- the seek pointer in this case can't be a single
|
|
|
125 integer but has to be a whole complicated structure that records
|
|
|
126 all of the stream's state at the time.
|
|
|
127
|
|
|
128 Rewind semantics are generally easy to implement, so we do provide
|
|
|
129 a rewind method. Even rewind() may not be available on a stream,
|
|
|
130 however -- e.g. on process output. */
|
|
|
131
|
|
|
132 typedef struct lstream_implementation
|
|
|
133 {
|
|
442
|
134 const char *name;
|
|
665
|
135 Bytecount size; /* Number of additional bytes to be
|
|
814
|
136 allocated with this stream. Access this
|
|
|
137 data using Lstream_data(). */
|
|
428
|
138 /* Read some data from the stream's end and store it into DATA, which
|
|
|
139 can hold SIZE bytes. Return the number of bytes read. A return
|
|
|
140 value of 0 means no bytes can be read at this time. This may
|
|
|
141 be because of an EOF, or because there is a granularity greater
|
|
|
142 than one byte that the stream imposes on the returned data, and
|
|
|
143 SIZE is less than this granularity. (This will happen frequently
|
|
|
144 for streams that need to return whole characters, because
|
|
|
145 Lstream_read() calls the reader function repeatedly until it
|
|
|
146 has the number of bytes it wants or until 0 is returned.)
|
|
|
147 The lstream functions do not treat a 0 return as EOF or do
|
|
|
148 anything special; however, the calling function will interpret
|
|
|
149 any 0 it gets back as EOF. This will normally not happen unless
|
|
|
150 the caller calls Lstream_read() with a very small size.
|
|
|
151
|
|
|
152 This function can be NULL if the stream is output-only. */
|
|
442
|
153 /* The omniscient mly, blinded by the irresistible thrall of Common
|
|
428
|
154 Lisp, thinks that it is bogus that the types and implementations
|
|
|
155 of input and output streams are the same. */
|
|
665
|
156 Bytecount (*reader) (Lstream *stream, unsigned char *data,
|
|
814
|
157 Bytecount size);
|
|
428
|
158 /* Send some data to the stream's end. Data to be sent is in DATA
|
|
|
159 and is SIZE bytes. Return the number of bytes sent. This
|
|
|
160 function can send and return fewer bytes than is passed in; in
|
|
|
161 that case, the function will just be called again until there is
|
|
|
162 no data left or 0 is returned. A return value of 0 means that no
|
|
|
163 more data can be currently stored, but there is no error; the
|
|
|
164 data will be squirrelled away until the writer can accept
|
|
|
165 data. (This is useful, e.g., of you're dealing with a
|
|
|
166 non-blocking file descriptor and are getting EWOULDBLOCK errors.)
|
|
|
167 This function can be NULL if the stream is input-only. */
|
|
665
|
168 Bytecount (*writer) (Lstream *stream, const unsigned char *data,
|
|
814
|
169 Bytecount size);
|
|
428
|
170 /* Return non-zero if the last write operation on the stream resulted
|
|
|
171 in an attempt to block (EWOULDBLOCK). If this method does not
|
|
|
172 exists, the implementation returns 0 */
|
|
|
173 int (*was_blocked_p) (Lstream *stream);
|
|
|
174 /* Rewind the stream. If this is NULL, the stream is not seekable. */
|
|
|
175 int (*rewinder) (Lstream *stream);
|
|
|
176 /* Indicate whether this stream is seekable -- i.e. it can be rewound.
|
|
|
177 This method is ignored if the stream does not have a rewind
|
|
|
178 method. If this method is not present, the result is determined
|
|
|
179 by whether a rewind method is present. */
|
|
|
180 int (*seekable_p) (Lstream *stream);
|
|
|
181 /* Perform any additional operations necessary to flush the
|
|
|
182 data in this stream. */
|
|
|
183 int (*flusher) (Lstream *stream);
|
|
771
|
184 /* Perform any additional operations necessary to close this stream down.
|
|
|
185 May be NULL. This function is called when Lstream_close() is called
|
|
|
186 (which will be called automatically on any open streams when they are
|
|
|
187 garbage-collected or deleted with Lstream_delete()). When this
|
|
|
188 function is called, all pending data in the stream will already have
|
|
|
189 been written out; however, the closer write more data, e.g. an "end"
|
|
|
190 section at the end of a file. */
|
|
428
|
191 int (*closer) (Lstream *stream);
|
|
771
|
192 /* Clean up any remaining data at the time that a stream is
|
|
|
193 garbage-collected or deleted with Lstream_delete(). If the stream was
|
|
|
194 open at this point, the finalizer is called after calling
|
|
|
195 Lstream_close(). Called only once (NOT called at disksave time). */
|
|
|
196 void (*finalizer) (Lstream *stream);
|
|
428
|
197 /* Mark this object for garbage collection. Same semantics as
|
|
|
198 a standard Lisp_Object marker. This function can be NULL. */
|
|
|
199 Lisp_Object (*marker) (Lisp_Object lstream);
|
|
|
200 } Lstream_implementation;
|
|
|
201
|
|
771
|
202 #define DEFINE_LSTREAM_IMPLEMENTATION(name, c_name) \
|
|
|
203 Lstream_implementation lstream_##c_name[1] = \
|
|
|
204 { { (name), sizeof (struct c_name##_stream) } }
|
|
|
205
|
|
|
206 #define DECLARE_LSTREAM(c_name) \
|
|
|
207 extern Lstream_implementation lstream_##c_name[]
|
|
428
|
208
|
|
|
209 #define LSTREAM_FL_IS_OPEN 1
|
|
|
210 #define LSTREAM_FL_READ 2
|
|
|
211 #define LSTREAM_FL_WRITE 4
|
|
|
212 #define LSTREAM_FL_NO_PARTIAL_CHARS 8
|
|
|
213 #define LSTREAM_FL_CLOSE_AT_DISKSAVE 16
|
|
|
214
|
|
|
215 struct lstream
|
|
|
216 {
|
|
|
217 struct lcrecord_header header;
|
|
442
|
218 const Lstream_implementation *imp; /* methods for this stream */
|
|
428
|
219 Lstream_buffering buffering; /* type of buffering in use */
|
|
665
|
220 Bytecount buffering_size; /* number of bytes buffered */
|
|
428
|
221
|
|
|
222 unsigned char *in_buffer; /* holds characters read from stream end */
|
|
665
|
223 Bytecount in_buffer_size; /* allocated size of buffer */
|
|
|
224 Bytecount in_buffer_current; /* number of characters in buffer */
|
|
|
225 Bytecount in_buffer_ind; /* pointer to next character to
|
|
462
|
226 take from buffer */
|
|
428
|
227
|
|
|
228 unsigned char *out_buffer; /* holds characters to write to stream end */
|
|
665
|
229 Bytecount out_buffer_size; /* allocated size of buffer */
|
|
|
230 Bytecount out_buffer_ind; /* pointer to next buffer spot to
|
|
462
|
231 write a character */
|
|
428
|
232
|
|
|
233 /* The unget buffer is more or less a stack -- things get pushed
|
|
|
234 onto the end and read back from the end. Lstream_read()
|
|
|
235 basically reads backwards from the end to get stuff; Lstream_unread()
|
|
|
236 similarly has to push the data on backwards. */
|
|
|
237 unsigned char *unget_buffer; /* holds characters pushed back onto input */
|
|
665
|
238 Bytecount unget_buffer_size; /* allocated size of buffer */
|
|
|
239 Bytecount unget_buffer_ind; /* pointer to next buffer spot
|
|
462
|
240 to write a character */
|
|
428
|
241
|
|
665
|
242 Bytecount byte_count;
|
|
456
|
243 int flags;
|
|
|
244 max_align_t data[1];
|
|
428
|
245 };
|
|
|
246
|
|
|
247 #define LSTREAM_TYPE_P(lstr, type) \
|
|
|
248 ((lstr)->imp == lstream_##type)
|
|
|
249
|
|
800
|
250 #ifdef ERROR_CHECK_TYPES
|
|
826
|
251 DECLARE_INLINE_HEADER (
|
|
|
252 struct lstream *
|
|
428
|
253 error_check_lstream_type (struct lstream *stream,
|
|
442
|
254 const Lstream_implementation *imp)
|
|
826
|
255 )
|
|
428
|
256 {
|
|
|
257 assert (stream->imp == imp);
|
|
|
258 return stream;
|
|
|
259 }
|
|
771
|
260 # define LSTREAM_TYPE_DATA(lstr, type) \
|
|
|
261 ((struct type##_stream *) \
|
|
|
262 Lstream_data (error_check_lstream_type (lstr, lstream_##type)))
|
|
428
|
263 #else
|
|
771
|
264 # define LSTREAM_TYPE_DATA(lstr, type) \
|
|
428
|
265 ((struct type##_stream *) Lstream_data (lstr))
|
|
|
266 #endif
|
|
|
267
|
|
771
|
268 /* Declare that lstream-type TYPE has method M; used in initialization
|
|
|
269 routines */
|
|
428
|
270 #define LSTREAM_HAS_METHOD(type, m) \
|
|
|
271 (lstream_##type->m = type##_##m)
|
|
|
272
|
|
|
273
|
|
442
|
274 Lstream *Lstream_new (const Lstream_implementation *imp,
|
|
|
275 const char *mode);
|
|
428
|
276 void Lstream_reopen (Lstream *lstr);
|
|
|
277 void Lstream_set_buffering (Lstream *lstr, Lstream_buffering buffering,
|
|
|
278 int buffering_size);
|
|
|
279 int Lstream_flush (Lstream *lstr);
|
|
|
280 int Lstream_flush_out (Lstream *lstr);
|
|
|
281 int Lstream_fputc (Lstream *lstr, int c);
|
|
|
282 int Lstream_fgetc (Lstream *lstr);
|
|
|
283 void Lstream_fungetc (Lstream *lstr, int c);
|
|
665
|
284 Bytecount Lstream_read (Lstream *lstr, void *data,
|
|
|
285 Bytecount size);
|
|
771
|
286 int Lstream_write (Lstream *lstr, const void *data,
|
|
|
287 Bytecount size);
|
|
428
|
288 int Lstream_was_blocked_p (Lstream *lstr);
|
|
665
|
289 void Lstream_unread (Lstream *lstr, const void *data, Bytecount size);
|
|
428
|
290 int Lstream_rewind (Lstream *lstr);
|
|
|
291 int Lstream_seekable_p (Lstream *lstr);
|
|
|
292 int Lstream_close (Lstream *lstr);
|
|
771
|
293
|
|
428
|
294 void Lstream_delete (Lstream *lstr);
|
|
|
295 void Lstream_set_character_mode (Lstream *str);
|
|
771
|
296 void Lstream_unset_character_mode (Lstream *lstr);
|
|
428
|
297
|
|
771
|
298 /* Lstream_putc: Write out one byte to the stream. This is a macro
|
|
|
299 and so it is very efficient. The C argument is only evaluated once
|
|
|
300 but the STREAM argument is evaluated more than once. Returns 0 on
|
|
|
301 success, -1 on error. */
|
|
428
|
302
|
|
771
|
303 #define Lstream_putc(stream, c) \
|
|
|
304 /* Call the function equivalent if the out buffer is full. Otherwise, \
|
|
|
305 add to the end of the out buffer and, if line buffering is called for \
|
|
|
306 and the character marks the end of a line, write out the buffer. */ \
|
|
|
307 ((stream)->out_buffer_ind >= (stream)->out_buffer_size ? \
|
|
|
308 Lstream_fputc (stream, c) : \
|
|
|
309 ((stream)->out_buffer[(stream)->out_buffer_ind++] = \
|
|
|
310 (unsigned char) (c), \
|
|
|
311 (stream)->byte_count++, \
|
|
|
312 (stream)->buffering == LSTREAM_LINE_BUFFERED && \
|
|
|
313 (stream)->out_buffer[(stream)->out_buffer_ind - 1] == '\n' ? \
|
|
428
|
314 Lstream_flush_out (stream) : 0))
|
|
|
315
|
|
771
|
316 /* Lstream_getc: Read one byte from the stream and returns it as an
|
|
|
317 unsigned char cast to an int, or EOF on end of file or error. This
|
|
|
318 is a macro and so it is very efficient. The STREAM argument is
|
|
|
319 evaluated more than once. */
|
|
|
320
|
|
|
321 #define Lstream_getc(stream) \
|
|
|
322 /* Retrieve from unget buffer if there are any characters there; \
|
|
|
323 else retrieve from in buffer if there's anything there; \
|
|
|
324 else call the function equivalent */ \
|
|
428
|
325 ((stream)->unget_buffer_ind > 0 ? \
|
|
|
326 ((stream)->byte_count++, \
|
|
|
327 (stream)->unget_buffer[--(stream)->unget_buffer_ind]) : \
|
|
|
328 (stream)->in_buffer_ind < (stream)->in_buffer_current ? \
|
|
|
329 ((stream)->byte_count++, \
|
|
|
330 (stream)->in_buffer[(stream)->in_buffer_ind++]) : \
|
|
|
331 Lstream_fgetc (stream))
|
|
|
332
|
|
771
|
333 /* Lstream_ungetc: Push one byte back onto the input queue, cast to
|
|
|
334 unsigned char. This will be the next byte read from the stream.
|
|
|
335 Any number of bytes can be pushed back and will be read in the
|
|
|
336 reverse order they were pushed back -- most recent first. (This is
|
|
|
337 necessary for consistency -- if there are a number of bytes that
|
|
|
338 have been unread and I read and unread a byte, it needs to be the
|
|
|
339 first to be read again.) This is a macro and so it is very
|
|
|
340 efficient. The C argument is only evaluated once but the STREAM
|
|
|
341 argument is evaluated more than once.
|
|
|
342 */
|
|
|
343
|
|
428
|
344 #define Lstream_ungetc(stream, c) \
|
|
771
|
345 /* Add to the end if it won't overflow buffer; otherwise call the \
|
|
|
346 function equivalent */ \
|
|
428
|
347 ((stream)->unget_buffer_ind >= (stream)->unget_buffer_size ? \
|
|
|
348 Lstream_fungetc (stream, c) : \
|
|
|
349 (void) ((stream)->byte_count--, \
|
|
|
350 ((stream)->unget_buffer[(stream)->unget_buffer_ind++] = \
|
|
|
351 (unsigned char) (c))))
|
|
|
352
|
|
|
353 #define Lstream_data(stream) ((void *) ((stream)->data))
|
|
|
354 #define Lstream_byte_count(stream) ((stream)->byte_count)
|
|
|
355
|
|
|
356
|
|
|
357 /************************************************************************/
|
|
867
|
358 /* working with an Lstream as a stream of Ichars */
|
|
428
|
359 /************************************************************************/
|
|
|
360
|
|
|
361 #ifdef MULE
|
|
|
362
|
|
826
|
363 DECLARE_INLINE_HEADER (
|
|
867
|
364 Ichar
|
|
|
365 Lstream_get_ichar (Lstream *stream)
|
|
826
|
366 )
|
|
428
|
367 {
|
|
|
368 int c = Lstream_getc (stream);
|
|
826
|
369 return (c < 0x80 /* c == EOF || byte_ascii_p (c) */
|
|
867
|
370 ? (Ichar) c
|
|
|
371 : Lstream_get_ichar_1 (stream, c));
|
|
428
|
372 }
|
|
|
373
|
|
867
|
374 /* Write an Ichar to a stream. Return value is 0 for success, -1 for
|
|
771
|
375 failure. */
|
|
|
376
|
|
826
|
377 DECLARE_INLINE_HEADER (
|
|
|
378 int
|
|
867
|
379 Lstream_put_ichar (Lstream *stream, Ichar ch)
|
|
826
|
380 )
|
|
428
|
381 {
|
|
867
|
382 return ichar_ascii_p (ch) ?
|
|
428
|
383 Lstream_putc (stream, ch) :
|
|
867
|
384 Lstream_fput_ichar (stream, ch);
|
|
428
|
385 }
|
|
|
386
|
|
826
|
387 DECLARE_INLINE_HEADER (
|
|
|
388 void
|
|
867
|
389 Lstream_unget_ichar (Lstream *stream, Ichar ch)
|
|
826
|
390 )
|
|
428
|
391 {
|
|
867
|
392 if (ichar_ascii_p (ch))
|
|
428
|
393 Lstream_ungetc (stream, ch);
|
|
|
394 else
|
|
867
|
395 Lstream_funget_ichar (stream, ch);
|
|
428
|
396 }
|
|
|
397 #else /* not MULE */
|
|
|
398
|
|
867
|
399 # define Lstream_get_ichar(stream) Lstream_getc (stream)
|
|
|
400 # define Lstream_put_ichar(stream, ch) Lstream_putc (stream, ch)
|
|
|
401 # define Lstream_unget_ichar(stream, ch) Lstream_ungetc (stream, ch)
|
|
428
|
402
|
|
|
403 #endif /* not MULE */
|
|
|
404
|
|
|
405
|
|
|
406 /************************************************************************/
|
|
|
407 /* Lstream implementations */
|
|
|
408 /************************************************************************/
|
|
|
409
|
|
|
410 /* Flags we can pass to the filedesc and stdio streams. */
|
|
|
411
|
|
|
412 /* If set, close the descriptor or FILE * when the stream is closed. */
|
|
|
413 #define LSTR_CLOSING 1
|
|
|
414
|
|
|
415 /* If set, allow quitting out of the actual I/O. */
|
|
|
416 #define LSTR_ALLOW_QUIT 2
|
|
|
417
|
|
|
418 /* If set and filedesc_stream_set_pty_flushing() has been called
|
|
|
419 on the stream, do not send more than pty_max_bytes on a single
|
|
|
420 line without flushing the data out using the eof_char. */
|
|
|
421 #define LSTR_PTY_FLUSHING 4
|
|
|
422
|
|
|
423 /* If set, an EWOULDBLOCK error is not treated as an error but
|
|
|
424 simply causes the write function to return 0 as the number
|
|
|
425 of bytes written out. */
|
|
|
426 #define LSTR_BLOCKED_OK 8
|
|
|
427
|
|
|
428 Lisp_Object make_stdio_input_stream (FILE *stream, int flags);
|
|
|
429 Lisp_Object make_stdio_output_stream (FILE *stream, int flags);
|
|
|
430 Lisp_Object make_filedesc_input_stream (int filedesc, int offset, int count,
|
|
|
431 int flags);
|
|
|
432 Lisp_Object make_filedesc_output_stream (int filedesc, int offset, int count,
|
|
|
433 int flags);
|
|
|
434 void filedesc_stream_set_pty_flushing (Lstream *stream,
|
|
|
435 int pty_max_bytes,
|
|
867
|
436 Ibyte eof_char);
|
|
428
|
437 int filedesc_stream_fd (Lstream *stream);
|
|
|
438 Lisp_Object make_lisp_string_input_stream (Lisp_Object string,
|
|
|
439 Bytecount offset,
|
|
|
440 Bytecount len);
|
|
462
|
441 Lisp_Object make_fixed_buffer_input_stream (const void *buf,
|
|
665
|
442 Bytecount size);
|
|
462
|
443 Lisp_Object make_fixed_buffer_output_stream (void *buf,
|
|
665
|
444 Bytecount size);
|
|
442
|
445 const unsigned char *fixed_buffer_input_stream_ptr (Lstream *stream);
|
|
428
|
446 unsigned char *fixed_buffer_output_stream_ptr (Lstream *stream);
|
|
|
447 Lisp_Object make_resizing_buffer_output_stream (void);
|
|
|
448 unsigned char *resizing_buffer_stream_ptr (Lstream *stream);
|
|
788
|
449 Lisp_Object resizing_buffer_to_lisp_string (Lstream *stream);
|
|
428
|
450 Lisp_Object make_dynarr_output_stream (unsigned_char_dynarr *dyn);
|
|
|
451 #define LSTR_SELECTIVE 1
|
|
|
452 #define LSTR_IGNORE_ACCESSIBLE 2
|
|
665
|
453 Lisp_Object make_lisp_buffer_input_stream (struct buffer *buf, Charbpos start,
|
|
|
454 Charbpos end, int flags);
|
|
|
455 Lisp_Object make_lisp_buffer_output_stream (struct buffer *buf, Charbpos pos,
|
|
428
|
456 int flags);
|
|
665
|
457 Charbpos lisp_buffer_stream_startpos (Lstream *stream);
|
|
428
|
458
|
|
440
|
459 #endif /* INCLUDED_lstream_h_ */
|
