Mercurial > hg > xemacs-beta
annotate src/lstream.h @ 5727:86d33ddc7fd6
Avoid EOVERFLOW from stat() calls due to overflowing inode numbers.
The btrfs filesystem now uses 64-bit inode numbers even on 32-bit systems.
This can lead to spurious stat() failures, where EOVERFLOW is returned because
the inode number does not fit into the 32-bit stat structure, even when the
caller is not interested in the inode number. This patch builds with
_FILE_OFFSET_BITS == 64 when possible, and deals with integers that may be
too large to fit into a Lisp fixnum. For more information, see xemacs-patches
message <CAHCOHQk_mPM6WgFChBsGafqhuazep6VED7swFoqfFXOV1r8org@mail.gmail.com>.
| author | Jerry James <james@xemacs.org> |
|---|---|
| date | Wed, 06 Mar 2013 08:32:17 -0700 |
| parents | 2dbefd79b3d3 |
| children | 65d65b52d608 |
| rev | line source |
|---|---|
| 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 | |
|
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7 XEmacs is free software: you can redistribute it and/or modify it |
| 428 | 8 under the terms of the GNU General Public License as published by the |
|
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9 Free Software Foundation, either version 3 of the License, or (at your |
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10 option) any later version. |
| 428 | 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 | |
|
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18 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 428 | 19 |
| 20 /* Synched up with: Not in FSF. */ | |
| 21 | |
| 22 /* Written by Ben Wing. */ | |
| 23 | |
| 440 | 24 #ifndef INCLUDED_lstream_h_ |
| 25 #define INCLUDED_lstream_h_ | |
| 428 | 26 |
| 27 /************************************************************************/ | |
| 28 /* definition of Lstream object */ | |
| 29 /************************************************************************/ | |
| 30 | |
|
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31 DECLARE_LISP_OBJECT (lstream, struct lstream); |
| 428 | 32 #define XLSTREAM(x) XRECORD (x, lstream, struct lstream) |
| 617 | 33 #define wrap_lstream(p) wrap_record (p, lstream) |
| 428 | 34 #define LSTREAMP(x) RECORDP (x, lstream) |
| 35 /* #define CHECK_LSTREAM(x) CHECK_RECORD (x, lstream) | |
| 36 Lstream pointers should never escape to the Lisp level, so | |
| 37 functions should not be doing this. */ | |
| 38 | |
| 39 #ifndef EOF | |
| 40 #define EOF (-1) | |
| 41 #endif | |
| 42 | |
| 771 | 43 /* There have been some arguments over the what the type should be that |
| 665 | 44 specifies a count of bytes in a data block to be written out or read in, |
| 45 using Lstream_read(), Lstream_write(), and related functions. | |
| 46 Originally it was long, which worked fine; Martin "corrected" these to | |
| 47 size_t and ssize_t on the grounds that this is theoretically cleaner and | |
| 48 is in keeping with the C standards. Unfortunately, this practice is | |
| 49 horribly error-prone due to design flaws in the way that mixed | |
| 50 signed/unsigned arithmetic happens. In fact, by doing this change, | |
| 51 Martin introduced a subtle but fatal error that caused the operation of | |
| 52 sending large mail messages to the SMTP server under Windows to fail. | |
| 53 By putting all values back to be signed, avoiding any signed/unsigned | |
| 54 mixing, the bug immediately went away. The type then in use was | |
| 55 Lstream_Data_Count, so that it be reverted cleanly if a vote came to | |
| 56 that. Now it is Bytecount. | |
| 57 | |
| 58 Some earlier comments about why the type must be signed: This MUST BE | |
| 59 SIGNED, since it also is used in functions that return the number of | |
| 60 bytes actually read to or written from in an operation, and these | |
| 61 functions can return -1 to signal error. | |
| 462 | 62 |
| 63 Note that the standard Unix read() and write() functions define the | |
| 64 count going in as a size_t, which is UNSIGNED, and the count going | |
| 65 out as an ssize_t, which is SIGNED. This is a horrible design | |
| 66 flaw. Not only is it highly likely to lead to logic errors when a | |
| 67 -1 gets interpreted as a large positive number, but operations are | |
| 68 bound to fail in all sorts of horrible ways when a number in the | |
| 69 upper-half of the size_t range is passed in -- this number is | |
| 70 unrepresentable as an ssize_t, so code that checks to see how many | |
| 71 bytes are actually written (which is mandatory if you are dealing | |
| 72 with certain types of devices) will get completely screwed up. | |
| 771 | 73 |
| 665 | 74 --ben |
| 462 | 75 */ |
| 428 | 76 typedef enum lstream_buffering |
| 77 { | |
| 78 /* No buffering. */ | |
| 79 LSTREAM_UNBUFFERED, | |
| 80 /* Buffer until a '\n' character is reached. */ | |
| 81 LSTREAM_LINE_BUFFERED, | |
| 82 /* Buffer in standard-size (i.e. 512-byte) blocks. */ | |
| 83 LSTREAM_BLOCK_BUFFERED, | |
| 84 /* Buffer in blocks of a specified size. */ | |
| 85 LSTREAM_BLOCKN_BUFFERED, | |
| 86 /* Buffer until the stream is closed (only applies to write-only | |
| 87 streams). Only one call to the stream writer will be made, | |
| 88 and that is when the stream is closed. */ | |
| 89 LSTREAM_UNLIMITED | |
| 90 } Lstream_buffering; | |
| 91 | |
| 771 | 92 #if 0 |
| 93 | |
| 94 /* #### not currently implemented; correct EOF handling is quite tricky | |
| 95 in the presence of various levels of filtering streams, and simply | |
| 96 interpreting 0 as EOF works fairly well as long as the amount of | |
| 97 data you're attempting to read is large and you know whether the | |
| 98 source stream at the end of the chain is a pipe (or other blocking | |
| 99 source) or not. we really should fix this, though. */ | |
| 100 | |
| 101 /* Return values from Lstream_read(). We do NOT use the C lib trick | |
| 102 of returning 0 to maybe indicate EOF because that is simply too | |
| 103 random and error-prone. It is quite legitimate for there to be no | |
| 104 data available but no EOF, even when not in the presence of | |
| 105 non-blocking I/O. For example, decoding/encoding streams (and in | |
| 106 general, any type of filtering stream) may only be able to return | |
| 107 data after a certain amount of data on the other end is | |
| 108 available. */ | |
| 109 | |
| 110 #define LSTREAM_EOF -2 | |
| 111 | |
| 112 #endif /* 0 */ | |
| 113 | |
| 114 #define LSTREAM_ERROR -1 | |
| 115 | |
| 428 | 116 /* Methods defining how this stream works. Some may be undefined. */ |
| 117 | |
| 118 /* We do not implement the seek/tell paradigm. I tried to do that, | |
| 119 but getting the semantics right in the presence of buffering is | |
| 120 extremely tricky and very error-prone and basically not worth it. | |
| 121 This is especially the case with complicated streams like | |
| 122 decoding streams -- the seek pointer in this case can't be a single | |
| 123 integer but has to be a whole complicated structure that records | |
| 124 all of the stream's state at the time. | |
| 125 | |
| 126 Rewind semantics are generally easy to implement, so we do provide | |
| 127 a rewind method. Even rewind() may not be available on a stream, | |
| 128 however -- e.g. on process output. */ | |
| 129 | |
| 130 typedef struct lstream_implementation | |
| 131 { | |
| 442 | 132 const char *name; |
| 665 | 133 Bytecount size; /* Number of additional bytes to be |
| 814 | 134 allocated with this stream. Access this |
| 135 data using Lstream_data(). */ | |
| 1204 | 136 |
| 137 /* Description of the extra data (struct foo_lstream) attached to a | |
| 138 coding system. */ | |
| 139 const struct sized_memory_description *extra_description; | |
| 140 | |
| 428 | 141 /* Read some data from the stream's end and store it into DATA, which |
| 142 can hold SIZE bytes. Return the number of bytes read. A return | |
| 143 value of 0 means no bytes can be read at this time. This may | |
| 144 be because of an EOF, or because there is a granularity greater | |
| 145 than one byte that the stream imposes on the returned data, and | |
| 146 SIZE is less than this granularity. (This will happen frequently | |
| 147 for streams that need to return whole characters, because | |
| 148 Lstream_read() calls the reader function repeatedly until it | |
| 149 has the number of bytes it wants or until 0 is returned.) | |
| 150 The lstream functions do not treat a 0 return as EOF or do | |
| 151 anything special; however, the calling function will interpret | |
| 152 any 0 it gets back as EOF. This will normally not happen unless | |
| 153 the caller calls Lstream_read() with a very small size. | |
| 154 | |
| 155 This function can be NULL if the stream is output-only. */ | |
| 442 | 156 /* The omniscient mly, blinded by the irresistible thrall of Common |
| 428 | 157 Lisp, thinks that it is bogus that the types and implementations |
| 158 of input and output streams are the same. */ | |
| 665 | 159 Bytecount (*reader) (Lstream *stream, unsigned char *data, |
| 814 | 160 Bytecount size); |
| 428 | 161 /* Send some data to the stream's end. Data to be sent is in DATA |
| 162 and is SIZE bytes. Return the number of bytes sent. This | |
| 163 function can send and return fewer bytes than is passed in; in | |
| 164 that case, the function will just be called again until there is | |
| 165 no data left or 0 is returned. A return value of 0 means that no | |
| 166 more data can be currently stored, but there is no error; the | |
| 167 data will be squirrelled away until the writer can accept | |
| 168 data. (This is useful, e.g., of you're dealing with a | |
| 169 non-blocking file descriptor and are getting EWOULDBLOCK errors.) | |
| 170 This function can be NULL if the stream is input-only. */ | |
| 665 | 171 Bytecount (*writer) (Lstream *stream, const unsigned char *data, |
| 814 | 172 Bytecount size); |
| 428 | 173 /* Return non-zero if the last write operation on the stream resulted |
| 174 in an attempt to block (EWOULDBLOCK). If this method does not | |
| 175 exists, the implementation returns 0 */ | |
| 176 int (*was_blocked_p) (Lstream *stream); | |
| 177 /* Rewind the stream. If this is NULL, the stream is not seekable. */ | |
| 178 int (*rewinder) (Lstream *stream); | |
| 179 /* Indicate whether this stream is seekable -- i.e. it can be rewound. | |
| 180 This method is ignored if the stream does not have a rewind | |
| 181 method. If this method is not present, the result is determined | |
| 182 by whether a rewind method is present. */ | |
| 183 int (*seekable_p) (Lstream *stream); | |
| 184 /* Perform any additional operations necessary to flush the | |
| 185 data in this stream. */ | |
| 186 int (*flusher) (Lstream *stream); | |
| 771 | 187 /* Perform any additional operations necessary to close this stream down. |
| 188 May be NULL. This function is called when Lstream_close() is called | |
| 189 (which will be called automatically on any open streams when they are | |
| 190 garbage-collected or deleted with Lstream_delete()). When this | |
| 191 function is called, all pending data in the stream will already have | |
| 192 been written out; however, the closer write more data, e.g. an "end" | |
| 193 section at the end of a file. */ | |
| 428 | 194 int (*closer) (Lstream *stream); |
| 771 | 195 /* Clean up any remaining data at the time that a stream is |
| 196 garbage-collected or deleted with Lstream_delete(). If the stream was | |
| 197 open at this point, the finalizer is called after calling | |
| 198 Lstream_close(). Called only once (NOT called at disksave time). */ | |
| 199 void (*finalizer) (Lstream *stream); | |
| 428 | 200 /* Mark this object for garbage collection. Same semantics as |
| 201 a standard Lisp_Object marker. This function can be NULL. */ | |
| 202 Lisp_Object (*marker) (Lisp_Object lstream); | |
| 203 } Lstream_implementation; | |
| 204 | |
| 771 | 205 #define DEFINE_LSTREAM_IMPLEMENTATION(name, c_name) \ |
| 206 Lstream_implementation lstream_##c_name[1] = \ | |
| 1204 | 207 { { (name), sizeof (struct c_name##_stream), \ |
| 208 &lstream_empty_extra_description } } | |
| 209 | |
| 210 #define DEFINE_LSTREAM_IMPLEMENTATION_WITH_DATA(name, c_name) \ | |
| 211 static const struct sized_memory_description c_name##_lstream_description_0 \ | |
| 212 = { \ | |
| 213 sizeof (struct c_name##_stream), \ | |
| 214 c_name##_lstream_description \ | |
| 215 }; \ | |
| 216 Lstream_implementation lstream_##c_name[1] = \ | |
| 217 { { (name), sizeof (struct c_name##_stream), \ | |
| 218 &c_name##_lstream_description_0 } } | |
| 771 | 219 |
| 220 #define DECLARE_LSTREAM(c_name) \ | |
| 221 extern Lstream_implementation lstream_##c_name[] | |
| 428 | 222 |
| 223 #define LSTREAM_FL_IS_OPEN 1 | |
| 224 #define LSTREAM_FL_READ 2 | |
| 225 #define LSTREAM_FL_WRITE 4 | |
| 226 #define LSTREAM_FL_NO_PARTIAL_CHARS 8 | |
| 227 #define LSTREAM_FL_CLOSE_AT_DISKSAVE 16 | |
| 228 | |
| 229 struct lstream | |
| 230 { | |
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231 NORMAL_LISP_OBJECT_HEADER header; |
| 442 | 232 const Lstream_implementation *imp; /* methods for this stream */ |
| 428 | 233 Lstream_buffering buffering; /* type of buffering in use */ |
| 665 | 234 Bytecount buffering_size; /* number of bytes buffered */ |
| 428 | 235 |
| 236 unsigned char *in_buffer; /* holds characters read from stream end */ | |
| 665 | 237 Bytecount in_buffer_size; /* allocated size of buffer */ |
| 238 Bytecount in_buffer_current; /* number of characters in buffer */ | |
| 239 Bytecount in_buffer_ind; /* pointer to next character to | |
| 462 | 240 take from buffer */ |
| 428 | 241 |
| 242 unsigned char *out_buffer; /* holds characters to write to stream end */ | |
| 665 | 243 Bytecount out_buffer_size; /* allocated size of buffer */ |
| 244 Bytecount out_buffer_ind; /* pointer to next buffer spot to | |
| 462 | 245 write a character */ |
| 428 | 246 |
| 247 /* The unget buffer is more or less a stack -- things get pushed | |
| 248 onto the end and read back from the end. Lstream_read() | |
| 249 basically reads backwards from the end to get stuff; Lstream_unread() | |
| 250 similarly has to push the data on backwards. */ | |
| 251 unsigned char *unget_buffer; /* holds characters pushed back onto input */ | |
| 665 | 252 Bytecount unget_buffer_size; /* allocated size of buffer */ |
| 253 Bytecount unget_buffer_ind; /* pointer to next buffer spot | |
| 462 | 254 to write a character */ |
| 428 | 255 |
| 665 | 256 Bytecount byte_count; |
| 456 | 257 int flags; |
| 258 max_align_t data[1]; | |
| 428 | 259 }; |
| 260 | |
| 1204 | 261 extern const struct sized_memory_description lstream_empty_extra_description; |
| 262 | |
| 428 | 263 #define LSTREAM_TYPE_P(lstr, type) \ |
| 264 ((lstr)->imp == lstream_##type) | |
| 265 | |
| 800 | 266 #ifdef ERROR_CHECK_TYPES |
| 826 | 267 DECLARE_INLINE_HEADER ( |
| 268 struct lstream * | |
| 428 | 269 error_check_lstream_type (struct lstream *stream, |
| 442 | 270 const Lstream_implementation *imp) |
| 826 | 271 ) |
| 428 | 272 { |
| 273 assert (stream->imp == imp); | |
| 274 return stream; | |
| 275 } | |
| 771 | 276 # define LSTREAM_TYPE_DATA(lstr, type) \ |
| 277 ((struct type##_stream *) \ | |
| 278 Lstream_data (error_check_lstream_type (lstr, lstream_##type))) | |
| 428 | 279 #else |
| 771 | 280 # define LSTREAM_TYPE_DATA(lstr, type) \ |
| 428 | 281 ((struct type##_stream *) Lstream_data (lstr)) |
| 282 #endif | |
| 283 | |
| 771 | 284 /* Declare that lstream-type TYPE has method M; used in initialization |
| 285 routines */ | |
| 428 | 286 #define LSTREAM_HAS_METHOD(type, m) \ |
| 287 (lstream_##type->m = type##_##m) | |
| 288 | |
| 289 | |
| 442 | 290 Lstream *Lstream_new (const Lstream_implementation *imp, |
| 291 const char *mode); | |
| 428 | 292 void Lstream_reopen (Lstream *lstr); |
| 293 void Lstream_set_buffering (Lstream *lstr, Lstream_buffering buffering, | |
| 294 int buffering_size); | |
| 295 int Lstream_flush (Lstream *lstr); | |
| 296 int Lstream_flush_out (Lstream *lstr); | |
| 297 int Lstream_fputc (Lstream *lstr, int c); | |
| 298 int Lstream_fgetc (Lstream *lstr); | |
| 299 void Lstream_fungetc (Lstream *lstr, int c); | |
| 665 | 300 Bytecount Lstream_read (Lstream *lstr, void *data, |
| 301 Bytecount size); | |
| 771 | 302 int Lstream_write (Lstream *lstr, const void *data, |
| 303 Bytecount size); | |
| 428 | 304 int Lstream_was_blocked_p (Lstream *lstr); |
| 665 | 305 void Lstream_unread (Lstream *lstr, const void *data, Bytecount size); |
| 428 | 306 int Lstream_rewind (Lstream *lstr); |
| 307 int Lstream_seekable_p (Lstream *lstr); | |
| 308 int Lstream_close (Lstream *lstr); | |
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309 int Lstream_close_noflush (Lstream *lstr); |
| 771 | 310 |
| 428 | 311 void Lstream_delete (Lstream *lstr); |
| 312 void Lstream_set_character_mode (Lstream *str); | |
| 771 | 313 void Lstream_unset_character_mode (Lstream *lstr); |
| 428 | 314 |
| 771 | 315 /* Lstream_putc: Write out one byte to the stream. This is a macro |
| 316 and so it is very efficient. The C argument is only evaluated once | |
| 317 but the STREAM argument is evaluated more than once. Returns 0 on | |
| 318 success, -1 on error. */ | |
| 428 | 319 |
| 771 | 320 #define Lstream_putc(stream, c) \ |
| 321 /* Call the function equivalent if the out buffer is full. Otherwise, \ | |
| 322 add to the end of the out buffer and, if line buffering is called for \ | |
| 323 and the character marks the end of a line, write out the buffer. */ \ | |
| 324 ((stream)->out_buffer_ind >= (stream)->out_buffer_size ? \ | |
| 325 Lstream_fputc (stream, c) : \ | |
| 326 ((stream)->out_buffer[(stream)->out_buffer_ind++] = \ | |
| 327 (unsigned char) (c), \ | |
| 328 (stream)->byte_count++, \ | |
| 329 (stream)->buffering == LSTREAM_LINE_BUFFERED && \ | |
| 330 (stream)->out_buffer[(stream)->out_buffer_ind - 1] == '\n' ? \ | |
| 428 | 331 Lstream_flush_out (stream) : 0)) |
| 332 | |
| 771 | 333 /* Lstream_getc: Read one byte from the stream and returns it as an |
| 334 unsigned char cast to an int, or EOF on end of file or error. This | |
| 335 is a macro and so it is very efficient. The STREAM argument is | |
| 336 evaluated more than once. */ | |
| 337 | |
| 338 #define Lstream_getc(stream) \ | |
| 339 /* Retrieve from unget buffer if there are any characters there; \ | |
| 340 else retrieve from in buffer if there's anything there; \ | |
| 341 else call the function equivalent */ \ | |
| 428 | 342 ((stream)->unget_buffer_ind > 0 ? \ |
| 343 ((stream)->byte_count++, \ | |
| 344 (stream)->unget_buffer[--(stream)->unget_buffer_ind]) : \ | |
| 345 (stream)->in_buffer_ind < (stream)->in_buffer_current ? \ | |
| 346 ((stream)->byte_count++, \ | |
| 347 (stream)->in_buffer[(stream)->in_buffer_ind++]) : \ | |
| 348 Lstream_fgetc (stream)) | |
| 349 | |
| 771 | 350 /* Lstream_ungetc: Push one byte back onto the input queue, cast to |
| 351 unsigned char. This will be the next byte read from the stream. | |
| 352 Any number of bytes can be pushed back and will be read in the | |
| 353 reverse order they were pushed back -- most recent first. (This is | |
| 354 necessary for consistency -- if there are a number of bytes that | |
| 355 have been unread and I read and unread a byte, it needs to be the | |
| 356 first to be read again.) This is a macro and so it is very | |
| 357 efficient. The C argument is only evaluated once but the STREAM | |
| 358 argument is evaluated more than once. | |
| 359 */ | |
| 360 | |
| 428 | 361 #define Lstream_ungetc(stream, c) \ |
| 771 | 362 /* Add to the end if it won't overflow buffer; otherwise call the \ |
| 363 function equivalent */ \ | |
| 428 | 364 ((stream)->unget_buffer_ind >= (stream)->unget_buffer_size ? \ |
| 365 Lstream_fungetc (stream, c) : \ | |
| 366 (void) ((stream)->byte_count--, \ | |
| 367 ((stream)->unget_buffer[(stream)->unget_buffer_ind++] = \ | |
| 368 (unsigned char) (c)))) | |
| 369 | |
| 370 #define Lstream_data(stream) ((void *) ((stream)->data)) | |
| 371 #define Lstream_byte_count(stream) ((stream)->byte_count) | |
| 372 | |
| 373 | |
| 374 /************************************************************************/ | |
| 867 | 375 /* working with an Lstream as a stream of Ichars */ |
| 428 | 376 /************************************************************************/ |
| 377 | |
| 378 #ifdef MULE | |
| 379 | |
| 826 | 380 DECLARE_INLINE_HEADER ( |
| 867 | 381 Ichar |
| 382 Lstream_get_ichar (Lstream *stream) | |
| 826 | 383 ) |
| 428 | 384 { |
| 385 int c = Lstream_getc (stream); | |
| 826 | 386 return (c < 0x80 /* c == EOF || byte_ascii_p (c) */ |
| 867 | 387 ? (Ichar) c |
| 388 : Lstream_get_ichar_1 (stream, c)); | |
| 428 | 389 } |
| 390 | |
| 867 | 391 /* Write an Ichar to a stream. Return value is 0 for success, -1 for |
| 771 | 392 failure. */ |
| 393 | |
| 826 | 394 DECLARE_INLINE_HEADER ( |
| 395 int | |
| 867 | 396 Lstream_put_ichar (Lstream *stream, Ichar ch) |
| 826 | 397 ) |
| 428 | 398 { |
| 867 | 399 return ichar_ascii_p (ch) ? |
| 428 | 400 Lstream_putc (stream, ch) : |
| 867 | 401 Lstream_fput_ichar (stream, ch); |
| 428 | 402 } |
| 403 | |
| 826 | 404 DECLARE_INLINE_HEADER ( |
| 405 void | |
| 867 | 406 Lstream_unget_ichar (Lstream *stream, Ichar ch) |
| 826 | 407 ) |
| 428 | 408 { |
| 867 | 409 if (ichar_ascii_p (ch)) |
| 428 | 410 Lstream_ungetc (stream, ch); |
| 411 else | |
| 867 | 412 Lstream_funget_ichar (stream, ch); |
| 428 | 413 } |
| 414 #else /* not MULE */ | |
| 415 | |
| 867 | 416 # define Lstream_get_ichar(stream) Lstream_getc (stream) |
| 417 # define Lstream_put_ichar(stream, ch) Lstream_putc (stream, ch) | |
| 418 # define Lstream_unget_ichar(stream, ch) Lstream_ungetc (stream, ch) | |
| 428 | 419 |
| 420 #endif /* not MULE */ | |
| 421 | |
| 422 | |
| 423 /************************************************************************/ | |
| 424 /* Lstream implementations */ | |
| 425 /************************************************************************/ | |
| 426 | |
| 427 /* Flags we can pass to the filedesc and stdio streams. */ | |
| 428 | |
| 429 /* If set, close the descriptor or FILE * when the stream is closed. */ | |
| 430 #define LSTR_CLOSING 1 | |
| 431 | |
| 432 /* If set, allow quitting out of the actual I/O. */ | |
| 433 #define LSTR_ALLOW_QUIT 2 | |
| 434 | |
| 435 /* If set and filedesc_stream_set_pty_flushing() has been called | |
| 436 on the stream, do not send more than pty_max_bytes on a single | |
| 437 line without flushing the data out using the eof_char. */ | |
| 438 #define LSTR_PTY_FLUSHING 4 | |
| 439 | |
| 440 /* If set, an EWOULDBLOCK error is not treated as an error but | |
| 441 simply causes the write function to return 0 as the number | |
| 442 of bytes written out. */ | |
| 443 #define LSTR_BLOCKED_OK 8 | |
| 444 | |
| 445 Lisp_Object make_stdio_input_stream (FILE *stream, int flags); | |
| 446 Lisp_Object make_stdio_output_stream (FILE *stream, int flags); | |
| 447 Lisp_Object make_filedesc_input_stream (int filedesc, int offset, int count, | |
| 448 int flags); | |
| 449 Lisp_Object make_filedesc_output_stream (int filedesc, int offset, int count, | |
| 450 int flags); | |
| 451 void filedesc_stream_set_pty_flushing (Lstream *stream, | |
| 452 int pty_max_bytes, | |
| 867 | 453 Ibyte eof_char); |
| 428 | 454 int filedesc_stream_fd (Lstream *stream); |
| 455 Lisp_Object make_lisp_string_input_stream (Lisp_Object string, | |
| 456 Bytecount offset, | |
| 457 Bytecount len); | |
| 462 | 458 Lisp_Object make_fixed_buffer_input_stream (const void *buf, |
| 665 | 459 Bytecount size); |
| 462 | 460 Lisp_Object make_fixed_buffer_output_stream (void *buf, |
| 665 | 461 Bytecount size); |
| 442 | 462 const unsigned char *fixed_buffer_input_stream_ptr (Lstream *stream); |
| 428 | 463 unsigned char *fixed_buffer_output_stream_ptr (Lstream *stream); |
| 464 Lisp_Object make_resizing_buffer_output_stream (void); | |
| 465 unsigned char *resizing_buffer_stream_ptr (Lstream *stream); | |
| 788 | 466 Lisp_Object resizing_buffer_to_lisp_string (Lstream *stream); |
| 428 | 467 Lisp_Object make_dynarr_output_stream (unsigned_char_dynarr *dyn); |
| 468 #define LSTR_SELECTIVE 1 | |
| 469 #define LSTR_IGNORE_ACCESSIBLE 2 | |
| 665 | 470 Lisp_Object make_lisp_buffer_input_stream (struct buffer *buf, Charbpos start, |
| 471 Charbpos end, int flags); | |
| 472 Lisp_Object make_lisp_buffer_output_stream (struct buffer *buf, Charbpos pos, | |
| 428 | 473 int flags); |
| 665 | 474 Charbpos lisp_buffer_stream_startpos (Lstream *stream); |
| 428 | 475 |
| 440 | 476 #endif /* INCLUDED_lstream_h_ */ |