|
428
|
1 /* Generic stream implementation -- header file.
|
|
|
2 Copyright (C) 1995 Free Software Foundation, Inc.
|
|
771
|
3 Copyright (C) 1996, 2001 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)
|
|
|
35 #define XSETLSTREAM(x, p) XSETRECORD (x, p, lstream)
|
|
617
|
36 #define wrap_lstream(p) wrap_record (p, lstream)
|
|
428
|
37 #define LSTREAMP(x) RECORDP (x, lstream)
|
|
|
38 /* #define CHECK_LSTREAM(x) CHECK_RECORD (x, lstream)
|
|
|
39 Lstream pointers should never escape to the Lisp level, so
|
|
|
40 functions should not be doing this. */
|
|
|
41
|
|
|
42 #ifndef EOF
|
|
|
43 #define EOF (-1)
|
|
|
44 #endif
|
|
|
45
|
|
771
|
46 /* There have been some arguments over the what the type should be that
|
|
665
|
47 specifies a count of bytes in a data block to be written out or read in,
|
|
|
48 using Lstream_read(), Lstream_write(), and related functions.
|
|
|
49 Originally it was long, which worked fine; Martin "corrected" these to
|
|
|
50 size_t and ssize_t on the grounds that this is theoretically cleaner and
|
|
|
51 is in keeping with the C standards. Unfortunately, this practice is
|
|
|
52 horribly error-prone due to design flaws in the way that mixed
|
|
|
53 signed/unsigned arithmetic happens. In fact, by doing this change,
|
|
|
54 Martin introduced a subtle but fatal error that caused the operation of
|
|
|
55 sending large mail messages to the SMTP server under Windows to fail.
|
|
|
56 By putting all values back to be signed, avoiding any signed/unsigned
|
|
|
57 mixing, the bug immediately went away. The type then in use was
|
|
|
58 Lstream_Data_Count, so that it be reverted cleanly if a vote came to
|
|
|
59 that. Now it is Bytecount.
|
|
|
60
|
|
|
61 Some earlier comments about why the type must be signed: This MUST BE
|
|
|
62 SIGNED, since it also is used in functions that return the number of
|
|
|
63 bytes actually read to or written from in an operation, and these
|
|
|
64 functions can return -1 to signal error.
|
|
462
|
65
|
|
|
66 Note that the standard Unix read() and write() functions define the
|
|
|
67 count going in as a size_t, which is UNSIGNED, and the count going
|
|
|
68 out as an ssize_t, which is SIGNED. This is a horrible design
|
|
|
69 flaw. Not only is it highly likely to lead to logic errors when a
|
|
|
70 -1 gets interpreted as a large positive number, but operations are
|
|
|
71 bound to fail in all sorts of horrible ways when a number in the
|
|
|
72 upper-half of the size_t range is passed in -- this number is
|
|
|
73 unrepresentable as an ssize_t, so code that checks to see how many
|
|
|
74 bytes are actually written (which is mandatory if you are dealing
|
|
|
75 with certain types of devices) will get completely screwed up.
|
|
771
|
76
|
|
665
|
77 --ben
|
|
462
|
78 */
|
|
428
|
79 typedef enum lstream_buffering
|
|
|
80 {
|
|
|
81 /* No buffering. */
|
|
|
82 LSTREAM_UNBUFFERED,
|
|
|
83 /* Buffer until a '\n' character is reached. */
|
|
|
84 LSTREAM_LINE_BUFFERED,
|
|
|
85 /* Buffer in standard-size (i.e. 512-byte) blocks. */
|
|
|
86 LSTREAM_BLOCK_BUFFERED,
|
|
|
87 /* Buffer in blocks of a specified size. */
|
|
|
88 LSTREAM_BLOCKN_BUFFERED,
|
|
|
89 /* Buffer until the stream is closed (only applies to write-only
|
|
|
90 streams). Only one call to the stream writer will be made,
|
|
|
91 and that is when the stream is closed. */
|
|
|
92 LSTREAM_UNLIMITED
|
|
|
93 } Lstream_buffering;
|
|
|
94
|
|
771
|
95 #if 0
|
|
|
96
|
|
|
97 /* #### not currently implemented; correct EOF handling is quite tricky
|
|
|
98 in the presence of various levels of filtering streams, and simply
|
|
|
99 interpreting 0 as EOF works fairly well as long as the amount of
|
|
|
100 data you're attempting to read is large and you know whether the
|
|
|
101 source stream at the end of the chain is a pipe (or other blocking
|
|
|
102 source) or not. we really should fix this, though. */
|
|
|
103
|
|
|
104 /* Return values from Lstream_read(). We do NOT use the C lib trick
|
|
|
105 of returning 0 to maybe indicate EOF because that is simply too
|
|
|
106 random and error-prone. It is quite legitimate for there to be no
|
|
|
107 data available but no EOF, even when not in the presence of
|
|
|
108 non-blocking I/O. For example, decoding/encoding streams (and in
|
|
|
109 general, any type of filtering stream) may only be able to return
|
|
|
110 data after a certain amount of data on the other end is
|
|
|
111 available. */
|
|
|
112
|
|
|
113 #define LSTREAM_EOF -2
|
|
|
114
|
|
|
115 #endif /* 0 */
|
|
|
116
|
|
|
117 #define LSTREAM_ERROR -1
|
|
|
118
|
|
428
|
119 /* Methods defining how this stream works. Some may be undefined. */
|
|
|
120
|
|
|
121 /* We do not implement the seek/tell paradigm. I tried to do that,
|
|
|
122 but getting the semantics right in the presence of buffering is
|
|
|
123 extremely tricky and very error-prone and basically not worth it.
|
|
|
124 This is especially the case with complicated streams like
|
|
|
125 decoding streams -- the seek pointer in this case can't be a single
|
|
|
126 integer but has to be a whole complicated structure that records
|
|
|
127 all of the stream's state at the time.
|
|
|
128
|
|
|
129 Rewind semantics are generally easy to implement, so we do provide
|
|
|
130 a rewind method. Even rewind() may not be available on a stream,
|
|
|
131 however -- e.g. on process output. */
|
|
|
132
|
|
|
133 typedef struct lstream_implementation
|
|
|
134 {
|
|
442
|
135 const char *name;
|
|
665
|
136 Bytecount size; /* Number of additional bytes to be
|
|
462
|
137 allocated with this stream. Access this
|
|
|
138 data using Lstream_data(). */
|
|
428
|
139 /* Read some data from the stream's end and store it into DATA, which
|
|
|
140 can hold SIZE bytes. Return the number of bytes read. A return
|
|
|
141 value of 0 means no bytes can be read at this time. This may
|
|
|
142 be because of an EOF, or because there is a granularity greater
|
|
|
143 than one byte that the stream imposes on the returned data, and
|
|
|
144 SIZE is less than this granularity. (This will happen frequently
|
|
|
145 for streams that need to return whole characters, because
|
|
|
146 Lstream_read() calls the reader function repeatedly until it
|
|
|
147 has the number of bytes it wants or until 0 is returned.)
|
|
|
148 The lstream functions do not treat a 0 return as EOF or do
|
|
|
149 anything special; however, the calling function will interpret
|
|
|
150 any 0 it gets back as EOF. This will normally not happen unless
|
|
|
151 the caller calls Lstream_read() with a very small size.
|
|
|
152
|
|
|
153 This function can be NULL if the stream is output-only. */
|
|
442
|
154 /* The omniscient mly, blinded by the irresistible thrall of Common
|
|
428
|
155 Lisp, thinks that it is bogus that the types and implementations
|
|
|
156 of input and output streams are the same. */
|
|
665
|
157 Bytecount (*reader) (Lstream *stream, unsigned char *data,
|
|
|
158 Bytecount size);
|
|
428
|
159 /* Send some data to the stream's end. Data to be sent is in DATA
|
|
|
160 and is SIZE bytes. Return the number of bytes sent. This
|
|
|
161 function can send and return fewer bytes than is passed in; in
|
|
|
162 that case, the function will just be called again until there is
|
|
|
163 no data left or 0 is returned. A return value of 0 means that no
|
|
|
164 more data can be currently stored, but there is no error; the
|
|
|
165 data will be squirrelled away until the writer can accept
|
|
|
166 data. (This is useful, e.g., of you're dealing with a
|
|
|
167 non-blocking file descriptor and are getting EWOULDBLOCK errors.)
|
|
|
168 This function can be NULL if the stream is input-only. */
|
|
665
|
169 Bytecount (*writer) (Lstream *stream, const unsigned char *data,
|
|
|
170 Bytecount size);
|
|
428
|
171 /* Return non-zero if the last write operation on the stream resulted
|
|
|
172 in an attempt to block (EWOULDBLOCK). If this method does not
|
|
|
173 exists, the implementation returns 0 */
|
|
|
174 int (*was_blocked_p) (Lstream *stream);
|
|
|
175 /* Rewind the stream. If this is NULL, the stream is not seekable. */
|
|
|
176 int (*rewinder) (Lstream *stream);
|
|
|
177 /* Indicate whether this stream is seekable -- i.e. it can be rewound.
|
|
|
178 This method is ignored if the stream does not have a rewind
|
|
|
179 method. If this method is not present, the result is determined
|
|
|
180 by whether a rewind method is present. */
|
|
|
181 int (*seekable_p) (Lstream *stream);
|
|
|
182 /* Perform any additional operations necessary to flush the
|
|
|
183 data in this stream. */
|
|
|
184 int (*flusher) (Lstream *stream);
|
|
771
|
185 /* Perform any additional operations necessary to close this stream down.
|
|
|
186 May be NULL. This function is called when Lstream_close() is called
|
|
|
187 (which will be called automatically on any open streams when they are
|
|
|
188 garbage-collected or deleted with Lstream_delete()). When this
|
|
|
189 function is called, all pending data in the stream will already have
|
|
|
190 been written out; however, the closer write more data, e.g. an "end"
|
|
|
191 section at the end of a file. */
|
|
428
|
192 int (*closer) (Lstream *stream);
|
|
771
|
193 /* Clean up any remaining data at the time that a stream is
|
|
|
194 garbage-collected or deleted with Lstream_delete(). If the stream was
|
|
|
195 open at this point, the finalizer is called after calling
|
|
|
196 Lstream_close(). Called only once (NOT called at disksave time). */
|
|
|
197 void (*finalizer) (Lstream *stream);
|
|
428
|
198 /* Mark this object for garbage collection. Same semantics as
|
|
|
199 a standard Lisp_Object marker. This function can be NULL. */
|
|
|
200 Lisp_Object (*marker) (Lisp_Object lstream);
|
|
|
201 } Lstream_implementation;
|
|
|
202
|
|
771
|
203 #define DEFINE_LSTREAM_IMPLEMENTATION(name, c_name) \
|
|
|
204 Lstream_implementation lstream_##c_name[1] = \
|
|
|
205 { { (name), sizeof (struct c_name##_stream) } }
|
|
|
206
|
|
|
207 #define DECLARE_LSTREAM(c_name) \
|
|
|
208 extern Lstream_implementation lstream_##c_name[]
|
|
428
|
209
|
|
|
210 #define LSTREAM_FL_IS_OPEN 1
|
|
|
211 #define LSTREAM_FL_READ 2
|
|
|
212 #define LSTREAM_FL_WRITE 4
|
|
|
213 #define LSTREAM_FL_NO_PARTIAL_CHARS 8
|
|
|
214 #define LSTREAM_FL_CLOSE_AT_DISKSAVE 16
|
|
|
215
|
|
|
216 struct lstream
|
|
|
217 {
|
|
|
218 struct lcrecord_header header;
|
|
442
|
219 const Lstream_implementation *imp; /* methods for this stream */
|
|
428
|
220 Lstream_buffering buffering; /* type of buffering in use */
|
|
665
|
221 Bytecount buffering_size; /* number of bytes buffered */
|
|
428
|
222
|
|
|
223 unsigned char *in_buffer; /* holds characters read from stream end */
|
|
665
|
224 Bytecount in_buffer_size; /* allocated size of buffer */
|
|
|
225 Bytecount in_buffer_current; /* number of characters in buffer */
|
|
|
226 Bytecount in_buffer_ind; /* pointer to next character to
|
|
462
|
227 take from buffer */
|
|
428
|
228
|
|
|
229 unsigned char *out_buffer; /* holds characters to write to stream end */
|
|
665
|
230 Bytecount out_buffer_size; /* allocated size of buffer */
|
|
|
231 Bytecount out_buffer_ind; /* pointer to next buffer spot to
|
|
462
|
232 write a character */
|
|
428
|
233
|
|
|
234 /* The unget buffer is more or less a stack -- things get pushed
|
|
|
235 onto the end and read back from the end. Lstream_read()
|
|
|
236 basically reads backwards from the end to get stuff; Lstream_unread()
|
|
|
237 similarly has to push the data on backwards. */
|
|
|
238 unsigned char *unget_buffer; /* holds characters pushed back onto input */
|
|
665
|
239 Bytecount unget_buffer_size; /* allocated size of buffer */
|
|
|
240 Bytecount unget_buffer_ind; /* pointer to next buffer spot
|
|
462
|
241 to write a character */
|
|
428
|
242
|
|
665
|
243 Bytecount byte_count;
|
|
456
|
244 int flags;
|
|
|
245 max_align_t data[1];
|
|
428
|
246 };
|
|
|
247
|
|
|
248 #define LSTREAM_TYPE_P(lstr, type) \
|
|
|
249 ((lstr)->imp == lstream_##type)
|
|
|
250
|
|
|
251 #ifdef ERROR_CHECK_TYPECHECK
|
|
442
|
252 INLINE_HEADER struct lstream *
|
|
428
|
253 error_check_lstream_type (struct lstream *stream,
|
|
442
|
254 const Lstream_implementation *imp);
|
|
|
255 INLINE_HEADER struct lstream *
|
|
428
|
256 error_check_lstream_type (struct lstream *stream,
|
|
442
|
257 const Lstream_implementation *imp)
|
|
428
|
258 {
|
|
|
259 assert (stream->imp == imp);
|
|
|
260 return stream;
|
|
|
261 }
|
|
771
|
262 # define LSTREAM_TYPE_DATA(lstr, type) \
|
|
|
263 ((struct type##_stream *) \
|
|
|
264 Lstream_data (error_check_lstream_type (lstr, lstream_##type)))
|
|
428
|
265 #else
|
|
771
|
266 # define LSTREAM_TYPE_DATA(lstr, type) \
|
|
428
|
267 ((struct type##_stream *) Lstream_data (lstr))
|
|
|
268 #endif
|
|
|
269
|
|
771
|
270 /* Declare that lstream-type TYPE has method M; used in initialization
|
|
|
271 routines */
|
|
428
|
272 #define LSTREAM_HAS_METHOD(type, m) \
|
|
|
273 (lstream_##type->m = type##_##m)
|
|
|
274
|
|
|
275
|
|
442
|
276 Lstream *Lstream_new (const Lstream_implementation *imp,
|
|
|
277 const char *mode);
|
|
428
|
278 void Lstream_reopen (Lstream *lstr);
|
|
|
279 void Lstream_set_buffering (Lstream *lstr, Lstream_buffering buffering,
|
|
|
280 int buffering_size);
|
|
|
281 int Lstream_flush (Lstream *lstr);
|
|
|
282 int Lstream_flush_out (Lstream *lstr);
|
|
|
283 int Lstream_fputc (Lstream *lstr, int c);
|
|
|
284 int Lstream_fgetc (Lstream *lstr);
|
|
|
285 void Lstream_fungetc (Lstream *lstr, int c);
|
|
665
|
286 Bytecount Lstream_read (Lstream *lstr, void *data,
|
|
|
287 Bytecount size);
|
|
771
|
288 int Lstream_write (Lstream *lstr, const void *data,
|
|
|
289 Bytecount size);
|
|
428
|
290 int Lstream_was_blocked_p (Lstream *lstr);
|
|
665
|
291 void Lstream_unread (Lstream *lstr, const void *data, Bytecount size);
|
|
428
|
292 int Lstream_rewind (Lstream *lstr);
|
|
|
293 int Lstream_seekable_p (Lstream *lstr);
|
|
|
294 int Lstream_close (Lstream *lstr);
|
|
771
|
295
|
|
428
|
296 void Lstream_delete (Lstream *lstr);
|
|
|
297 void Lstream_set_character_mode (Lstream *str);
|
|
771
|
298 void Lstream_unset_character_mode (Lstream *lstr);
|
|
428
|
299
|
|
771
|
300 /* Lstream_putc: Write out one byte to the stream. This is a macro
|
|
|
301 and so it is very efficient. The C argument is only evaluated once
|
|
|
302 but the STREAM argument is evaluated more than once. Returns 0 on
|
|
|
303 success, -1 on error. */
|
|
428
|
304
|
|
771
|
305 #define Lstream_putc(stream, c) \
|
|
|
306 /* Call the function equivalent if the out buffer is full. Otherwise, \
|
|
|
307 add to the end of the out buffer and, if line buffering is called for \
|
|
|
308 and the character marks the end of a line, write out the buffer. */ \
|
|
|
309 ((stream)->out_buffer_ind >= (stream)->out_buffer_size ? \
|
|
|
310 Lstream_fputc (stream, c) : \
|
|
|
311 ((stream)->out_buffer[(stream)->out_buffer_ind++] = \
|
|
|
312 (unsigned char) (c), \
|
|
|
313 (stream)->byte_count++, \
|
|
|
314 (stream)->buffering == LSTREAM_LINE_BUFFERED && \
|
|
|
315 (stream)->out_buffer[(stream)->out_buffer_ind - 1] == '\n' ? \
|
|
428
|
316 Lstream_flush_out (stream) : 0))
|
|
|
317
|
|
771
|
318 /* Lstream_getc: Read one byte from the stream and returns it as an
|
|
|
319 unsigned char cast to an int, or EOF on end of file or error. This
|
|
|
320 is a macro and so it is very efficient. The STREAM argument is
|
|
|
321 evaluated more than once. */
|
|
|
322
|
|
|
323 #define Lstream_getc(stream) \
|
|
|
324 /* Retrieve from unget buffer if there are any characters there; \
|
|
|
325 else retrieve from in buffer if there's anything there; \
|
|
|
326 else call the function equivalent */ \
|
|
428
|
327 ((stream)->unget_buffer_ind > 0 ? \
|
|
|
328 ((stream)->byte_count++, \
|
|
|
329 (stream)->unget_buffer[--(stream)->unget_buffer_ind]) : \
|
|
|
330 (stream)->in_buffer_ind < (stream)->in_buffer_current ? \
|
|
|
331 ((stream)->byte_count++, \
|
|
|
332 (stream)->in_buffer[(stream)->in_buffer_ind++]) : \
|
|
|
333 Lstream_fgetc (stream))
|
|
|
334
|
|
771
|
335 /* Lstream_ungetc: Push one byte back onto the input queue, cast to
|
|
|
336 unsigned char. This will be the next byte read from the stream.
|
|
|
337 Any number of bytes can be pushed back and will be read in the
|
|
|
338 reverse order they were pushed back -- most recent first. (This is
|
|
|
339 necessary for consistency -- if there are a number of bytes that
|
|
|
340 have been unread and I read and unread a byte, it needs to be the
|
|
|
341 first to be read again.) This is a macro and so it is very
|
|
|
342 efficient. The C argument is only evaluated once but the STREAM
|
|
|
343 argument is evaluated more than once.
|
|
|
344 */
|
|
|
345
|
|
428
|
346 #define Lstream_ungetc(stream, c) \
|
|
771
|
347 /* Add to the end if it won't overflow buffer; otherwise call the \
|
|
|
348 function equivalent */ \
|
|
428
|
349 ((stream)->unget_buffer_ind >= (stream)->unget_buffer_size ? \
|
|
|
350 Lstream_fungetc (stream, c) : \
|
|
|
351 (void) ((stream)->byte_count--, \
|
|
|
352 ((stream)->unget_buffer[(stream)->unget_buffer_ind++] = \
|
|
|
353 (unsigned char) (c))))
|
|
|
354
|
|
|
355 #define Lstream_data(stream) ((void *) ((stream)->data))
|
|
|
356 #define Lstream_byte_count(stream) ((stream)->byte_count)
|
|
|
357
|
|
|
358
|
|
|
359 /************************************************************************/
|
|
|
360 /* working with an Lstream as a stream of Emchars */
|
|
|
361 /************************************************************************/
|
|
|
362
|
|
|
363 #ifdef MULE
|
|
|
364
|
|
442
|
365 INLINE_HEADER Emchar Lstream_get_emchar (Lstream *stream);
|
|
|
366 INLINE_HEADER Emchar
|
|
428
|
367 Lstream_get_emchar (Lstream *stream)
|
|
|
368 {
|
|
|
369 int c = Lstream_getc (stream);
|
|
444
|
370 return (c < 0x80 /* c == EOF || BYTE_ASCII_P (c) */
|
|
|
371 ? (Emchar) c
|
|
|
372 : Lstream_get_emchar_1 (stream, c));
|
|
428
|
373 }
|
|
|
374
|
|
771
|
375 /* Write an Emchar to a stream. Return value is 0 for success, -1 for
|
|
|
376 failure. */
|
|
|
377
|
|
442
|
378 INLINE_HEADER int Lstream_put_emchar (Lstream *stream, Emchar ch);
|
|
|
379 INLINE_HEADER int
|
|
428
|
380 Lstream_put_emchar (Lstream *stream, Emchar ch)
|
|
|
381 {
|
|
|
382 return CHAR_ASCII_P (ch) ?
|
|
|
383 Lstream_putc (stream, ch) :
|
|
|
384 Lstream_fput_emchar (stream, ch);
|
|
|
385 }
|
|
|
386
|
|
442
|
387 INLINE_HEADER void Lstream_unget_emchar (Lstream *stream, Emchar ch);
|
|
|
388 INLINE_HEADER void
|
|
428
|
389 Lstream_unget_emchar (Lstream *stream, Emchar ch)
|
|
|
390 {
|
|
|
391 if (CHAR_ASCII_P (ch))
|
|
|
392 Lstream_ungetc (stream, ch);
|
|
|
393 else
|
|
|
394 Lstream_funget_emchar (stream, ch);
|
|
|
395 }
|
|
|
396 #else /* not MULE */
|
|
|
397
|
|
|
398 # define Lstream_get_emchar(stream) Lstream_getc (stream)
|
|
|
399 # define Lstream_put_emchar(stream, ch) Lstream_putc (stream, ch)
|
|
|
400 # define Lstream_unget_emchar(stream, ch) Lstream_ungetc (stream, ch)
|
|
|
401
|
|
|
402 #endif /* not MULE */
|
|
|
403
|
|
|
404
|
|
|
405 /************************************************************************/
|
|
|
406 /* Lstream implementations */
|
|
|
407 /************************************************************************/
|
|
|
408
|
|
|
409 /* Flags we can pass to the filedesc and stdio streams. */
|
|
|
410
|
|
|
411 /* If set, close the descriptor or FILE * when the stream is closed. */
|
|
|
412 #define LSTR_CLOSING 1
|
|
|
413
|
|
|
414 /* If set, allow quitting out of the actual I/O. */
|
|
|
415 #define LSTR_ALLOW_QUIT 2
|
|
|
416
|
|
|
417 /* If set and filedesc_stream_set_pty_flushing() has been called
|
|
|
418 on the stream, do not send more than pty_max_bytes on a single
|
|
|
419 line without flushing the data out using the eof_char. */
|
|
|
420 #define LSTR_PTY_FLUSHING 4
|
|
|
421
|
|
|
422 /* If set, an EWOULDBLOCK error is not treated as an error but
|
|
|
423 simply causes the write function to return 0 as the number
|
|
|
424 of bytes written out. */
|
|
|
425 #define LSTR_BLOCKED_OK 8
|
|
|
426
|
|
|
427 Lisp_Object make_stdio_input_stream (FILE *stream, int flags);
|
|
|
428 Lisp_Object make_stdio_output_stream (FILE *stream, int flags);
|
|
|
429 Lisp_Object make_filedesc_input_stream (int filedesc, int offset, int count,
|
|
|
430 int flags);
|
|
|
431 Lisp_Object make_filedesc_output_stream (int filedesc, int offset, int count,
|
|
|
432 int flags);
|
|
|
433 void filedesc_stream_set_pty_flushing (Lstream *stream,
|
|
|
434 int pty_max_bytes,
|
|
665
|
435 Intbyte eof_char);
|
|
428
|
436 int filedesc_stream_fd (Lstream *stream);
|
|
|
437 Lisp_Object make_lisp_string_input_stream (Lisp_Object string,
|
|
|
438 Bytecount offset,
|
|
|
439 Bytecount len);
|
|
462
|
440 Lisp_Object make_fixed_buffer_input_stream (const void *buf,
|
|
665
|
441 Bytecount size);
|
|
462
|
442 Lisp_Object make_fixed_buffer_output_stream (void *buf,
|
|
665
|
443 Bytecount size);
|
|
442
|
444 const unsigned char *fixed_buffer_input_stream_ptr (Lstream *stream);
|
|
428
|
445 unsigned char *fixed_buffer_output_stream_ptr (Lstream *stream);
|
|
|
446 Lisp_Object make_resizing_buffer_output_stream (void);
|
|
|
447 unsigned char *resizing_buffer_stream_ptr (Lstream *stream);
|
|
|
448 Lisp_Object make_dynarr_output_stream (unsigned_char_dynarr *dyn);
|
|
|
449 #define LSTR_SELECTIVE 1
|
|
|
450 #define LSTR_IGNORE_ACCESSIBLE 2
|
|
665
|
451 Lisp_Object make_lisp_buffer_input_stream (struct buffer *buf, Charbpos start,
|
|
|
452 Charbpos end, int flags);
|
|
|
453 Lisp_Object make_lisp_buffer_output_stream (struct buffer *buf, Charbpos pos,
|
|
428
|
454 int flags);
|
|
665
|
455 Charbpos lisp_buffer_stream_startpos (Lstream *stream);
|
|
428
|
456
|
|
440
|
457 #endif /* INCLUDED_lstream_h_ */
|
