Mercurial > hg > xemacs-beta
annotate src/lstream.c @ 4985:358aa3bb603f
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| author | Ben Wing <ben@xemacs.org> |
|---|---|
| date | Fri, 05 Feb 2010 12:12:28 -0600 |
| parents | 16112448d484 |
| children | 6f2158fa75ed b5df3737028a |
| rev | line source |
|---|---|
| 428 | 1 /* Generic stream implementation. |
| 2 Copyright (C) 1995 Free Software Foundation, Inc. | |
| 3 Copyright (C) 1995 Sun Microsystems, Inc. | |
| 788 | 4 Copyright (C) 1996, 2001, 2002 Ben Wing. |
| 428 | 5 |
| 6 This file is part of XEmacs. | |
| 7 | |
| 8 XEmacs is free software; you can redistribute it and/or modify it | |
| 9 under the terms of the GNU General Public License as published by the | |
| 10 Free Software Foundation; either version 2, or (at your option) any | |
| 11 later version. | |
| 12 | |
| 13 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 19 along with XEmacs; see the file COPYING. If not, write to | |
| 20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 21 Boston, MA 02111-1307, USA. */ | |
| 22 | |
| 23 /* Synched up with: Not in FSF. */ | |
| 24 | |
| 25 /* Written by Ben Wing. */ | |
| 26 | |
| 27 #include <config.h> | |
| 28 #include "lisp.h" | |
| 29 | |
| 30 #include "buffer.h" | |
| 31 #include "insdel.h" | |
| 32 #include "lstream.h" | |
| 33 | |
| 34 #include "sysfile.h" | |
| 35 | |
| 771 | 36 /* This module provides a generic buffering stream implementation. |
| 428 | 37 Conceptually, you send data to the stream or read data from the |
| 38 stream, not caring what's on the other end of the stream. The | |
| 39 other end could be another stream, a file descriptor, a stdio | |
| 40 stream, a fixed block of memory, a reallocating block of memory, | |
| 41 etc. The main purpose of the stream is to provide a standard | |
| 42 interface and to do buffering. Macros are defined to read | |
| 43 or write characters, so the calling functions do not have to | |
| 44 worry about blocking data together in order to achieve efficiency. | |
| 45 | |
| 771 | 46 Note that this object is called "stream" in Lisp but "lstream" |
| 428 | 47 in C. The reason for this is that "stream" is too generic a name |
| 48 for C; too much likelihood of conflict/confusion with C++, etc. */ | |
| 49 | |
| 50 #define DEFAULT_BLOCK_BUFFERING_SIZE 512 | |
| 51 #define MAX_READ_SIZE 512 | |
| 52 | |
| 53 static Lisp_Object | |
| 54 mark_lstream (Lisp_Object obj) | |
| 55 { | |
| 56 Lstream *lstr = XLSTREAM (obj); | |
| 57 return lstr->imp->marker ? (lstr->imp->marker) (obj) : Qnil; | |
| 58 } | |
| 59 | |
| 60 static void | |
| 2286 | 61 print_lstream (Lisp_Object obj, Lisp_Object printcharfun, |
| 62 int UNUSED (escapeflag)) | |
| 428 | 63 { |
| 64 Lstream *lstr = XLSTREAM (obj); | |
| 65 | |
| 800 | 66 write_fmt_string (printcharfun, |
| 67 "#<INTERNAL OBJECT (XEmacs bug?) (%s lstream) 0x%lx>", | |
| 68 lstr->imp->name, (long) lstr); | |
| 428 | 69 } |
| 70 | |
| 71 static void | |
| 72 finalize_lstream (void *header, int for_disksave) | |
| 73 { | |
| 74 /* WARNING WARNING WARNING. This function (and all finalize functions) | |
| 75 may get called more than once on the same object, and may get called | |
| 76 (at dump time) on objects that are not being released. */ | |
| 77 Lstream *lstr = (Lstream *) header; | |
| 78 | |
| 79 #if 0 /* this may cause weird Broken Pipes? */ | |
| 80 if (for_disksave) | |
| 81 { | |
| 82 Lstream_pseudo_close (lstr); | |
| 83 return; | |
| 84 } | |
| 85 #endif | |
| 86 if (lstr->flags & LSTREAM_FL_IS_OPEN) | |
| 87 { | |
| 88 if (for_disksave) | |
| 89 { | |
| 90 if (lstr->flags & LSTREAM_FL_CLOSE_AT_DISKSAVE) | |
| 91 Lstream_close (lstr); | |
| 92 } | |
| 93 else | |
| 94 /* Just close. */ | |
| 95 Lstream_close (lstr); | |
| 96 } | |
| 771 | 97 |
| 98 if (!for_disksave) | |
| 99 { | |
| 100 if (lstr->imp->finalizer) | |
| 101 (lstr->imp->finalizer) (lstr); | |
| 102 } | |
| 428 | 103 } |
| 104 | |
| 665 | 105 inline static Bytecount |
| 106 aligned_sizeof_lstream (Bytecount lstream_type_specific_size) | |
| 456 | 107 { |
| 826 | 108 return MAX_ALIGN_SIZE (offsetof (Lstream, data) + |
| 109 lstream_type_specific_size); | |
| 456 | 110 } |
| 111 | |
| 665 | 112 static Bytecount |
| 442 | 113 sizeof_lstream (const void *header) |
| 428 | 114 { |
| 456 | 115 return aligned_sizeof_lstream (((const Lstream *) header)->imp->size); |
| 428 | 116 } |
| 117 | |
| 1204 | 118 static const struct memory_description lstream_implementation_description_1[] |
| 119 = { | |
| 120 { XD_END } | |
| 121 }; | |
| 122 | |
| 123 const struct sized_memory_description lstream_implementation_description = { | |
| 124 sizeof (struct lstream_implementation), | |
| 125 lstream_implementation_description_1 | |
| 126 }; | |
| 127 | |
| 128 static const struct sized_memory_description lstream_extra_description_map[] = | |
| 129 { | |
| 130 { offsetof (Lstream, imp) }, | |
| 131 { offsetof (struct lstream_implementation, extra_description) }, | |
| 132 { -1 }, | |
| 133 }; | |
| 134 | |
| 135 static const struct memory_description lstream_description[] = | |
| 136 { | |
| 2367 | 137 { XD_BLOCK_PTR, offsetof (Lstream, imp), 1, |
| 2551 | 138 { &lstream_implementation_description } }, |
| 2367 | 139 { XD_BLOCK_ARRAY, offsetof (Lstream, data), 1, |
| 2551 | 140 { lstream_extra_description_map } }, |
| 1204 | 141 { XD_END } |
| 142 }; | |
| 143 | |
| 144 static const struct memory_description lstream_empty_extra_description_1[] = | |
| 145 { | |
| 146 { XD_END } | |
| 147 }; | |
| 148 | |
| 149 const struct sized_memory_description lstream_empty_extra_description = { | |
| 150 0, lstream_empty_extra_description_1 | |
| 151 }; | |
| 152 | |
| 934 | 153 DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION ("stream", lstream, |
| 154 0, /*dumpable-flag*/ | |
| 155 mark_lstream, print_lstream, | |
| 1204 | 156 finalize_lstream, 0, 0, |
| 157 lstream_description, | |
| 934 | 158 sizeof_lstream, Lstream); |
| 428 | 159 |
| 771 | 160 |
| 161 /* Change the buffering of a stream. See lstream.h. By default the | |
| 162 buffering is STREAM_BLOCK_BUFFERED. */ | |
| 163 | |
| 428 | 164 void |
| 165 Lstream_set_buffering (Lstream *lstr, Lstream_buffering buffering, | |
| 166 int buffering_size) | |
| 167 { | |
| 168 lstr->buffering = buffering; | |
| 169 switch (buffering) | |
| 170 { | |
| 171 case LSTREAM_UNBUFFERED: | |
| 172 lstr->buffering_size = 0; break; | |
| 173 case LSTREAM_BLOCK_BUFFERED: | |
| 174 lstr->buffering_size = DEFAULT_BLOCK_BUFFERING_SIZE; break; | |
| 175 case LSTREAM_BLOCKN_BUFFERED: | |
| 176 lstr->buffering_size = buffering_size; break; | |
| 177 case LSTREAM_LINE_BUFFERED: | |
| 178 case LSTREAM_UNLIMITED: | |
| 179 lstr->buffering_size = INT_MAX; break; | |
| 180 } | |
| 181 } | |
| 182 | |
| 3263 | 183 #ifndef NEW_GC |
| 442 | 184 static const Lstream_implementation *lstream_types[32]; |
| 428 | 185 static Lisp_Object Vlstream_free_list[32]; |
| 186 static int lstream_type_count; | |
| 3263 | 187 #endif /* not NEW_GC */ |
| 428 | 188 |
| 771 | 189 /* Allocate and return a new Lstream. This function is not really |
| 190 meant to be called directly; rather, each stream type should | |
| 191 provide its own stream creation function, which creates the stream | |
| 192 and does any other necessary creation stuff (e.g. opening a | |
| 193 file). */ | |
| 194 | |
| 428 | 195 Lstream * |
| 442 | 196 Lstream_new (const Lstream_implementation *imp, const char *mode) |
| 428 | 197 { |
| 198 Lstream *p; | |
| 3263 | 199 #ifdef NEW_GC |
| 2720 | 200 p = XLSTREAM (wrap_pointer_1 |
| 201 (alloc_lrecord (aligned_sizeof_lstream (imp->size), | |
| 202 &lrecord_lstream))); | |
| 3263 | 203 #else /* not NEW_GC */ |
| 428 | 204 int i; |
| 205 | |
| 206 for (i = 0; i < lstream_type_count; i++) | |
| 207 { | |
| 208 if (lstream_types[i] == imp) | |
| 209 break; | |
| 210 } | |
| 211 | |
| 212 if (i == lstream_type_count) | |
| 213 { | |
| 214 assert (lstream_type_count < countof (lstream_types)); | |
| 215 lstream_types[lstream_type_count] = imp; | |
| 216 Vlstream_free_list[lstream_type_count] = | |
| 456 | 217 make_lcrecord_list (aligned_sizeof_lstream (imp->size), |
| 428 | 218 &lrecord_lstream); |
| 219 lstream_type_count++; | |
| 220 } | |
| 221 | |
| 1204 | 222 p = XLSTREAM (alloc_managed_lcrecord (Vlstream_free_list[i])); |
| 3263 | 223 #endif /* not NEW_GC */ |
| 428 | 224 /* Zero it out, except the header. */ |
| 456 | 225 memset ((char *) p + sizeof (p->header), '\0', |
| 226 aligned_sizeof_lstream (imp->size) - sizeof (p->header)); | |
| 428 | 227 p->imp = imp; |
| 228 Lstream_set_buffering (p, LSTREAM_BLOCK_BUFFERED, 0); | |
| 229 p->flags = LSTREAM_FL_IS_OPEN; | |
| 230 | |
| 231 /* convert mode (one of "r", "w", "rc", "wc") to p->flags */ | |
| 232 assert (mode[0] == 'r' || mode[0] == 'w'); | |
| 233 assert (mode[1] == 'c' || mode[1] == '\0'); | |
| 234 p->flags |= (mode[0] == 'r' ? LSTREAM_FL_READ : LSTREAM_FL_WRITE); | |
| 235 if (mode[1] == 'c') | |
| 236 p->flags |= LSTREAM_FL_NO_PARTIAL_CHARS; | |
| 237 | |
| 238 return p; | |
| 239 } | |
| 240 | |
| 771 | 241 /* Set or unset "character mode" on the stream. The basic idea is that, |
| 242 assuming valid internal-format data is passing through the stream and | |
| 243 we're processing the data character by character, we don't want partial | |
| 244 characters at the end of the data. (No partial characters at the | |
| 245 beginning happens naturally if we eliminate partial characters at the | |
| 246 end and the stream is implemented correctly.) | |
| 247 | |
| 248 Character mode actually has two somewhat different meanings, depending | |
| 249 on whether this is a read stream or write stream. If a read stream, | |
| 250 character mode means that data returned from calling Lstream_read() on | |
| 251 the stream will contain only full characters. If a write stream, | |
| 252 character mode means that data passed to the write method in the stream | |
| 253 implementation will contain only full characters. It's important to | |
| 254 note the non-parallelism in who should set this mode on the stream: The | |
| 255 *CALLER* sets character mode on read streams it creates; the *STREAM | |
| 256 ITSELF* sets character mode on write streams, typically at creation | |
| 814 | 257 time. |
| 258 | |
| 259 (However, if a read stream always generates internal-format data, then | |
| 260 the callers will almost always want character mode, and it's allowed to | |
| 261 set this on behalf of the caller, as long as a flag can be provided at | |
| 262 creation time to disable this behavior.) */ | |
| 771 | 263 |
| 428 | 264 void |
| 265 Lstream_set_character_mode (Lstream *lstr) | |
| 266 { | |
| 267 lstr->flags |= LSTREAM_FL_NO_PARTIAL_CHARS; | |
| 268 } | |
| 269 | |
| 771 | 270 /* Unset character mode. See Lstream_set_character_mode(). */ |
| 271 | |
| 272 void | |
| 273 Lstream_unset_character_mode (Lstream *lstr) | |
| 274 { | |
| 275 lstr->flags &= ~LSTREAM_FL_NO_PARTIAL_CHARS; | |
| 276 } | |
| 277 | |
| 278 /* Close the stream (if it's open), and free all memory associated with the | |
| 279 stream. Put the stream on a free list; later calls to create a new | |
| 280 stream of this type may reuse this stream. Calling this is not strictly | |
| 281 necessary, but it is much more efficient than having the Lstream be | |
| 282 garbage-collected. Be VERY VERY SURE there are no pointers to this | |
| 283 object hanging around anywhere where they might be used! When streams | |
| 284 are chained together, be VERY CAREFUL of the order in which you delete | |
| 285 them! (e.g. if the streams are in a singly-linked list, delete the head | |
| 814 | 286 first; this will close (but check the documentation, e.g. of |
| 287 make_coding_input_stream()), and may send data down to the rest. Then | |
| 771 | 288 proceed to the rest, one by one. If the chains are in a doubly-linked |
| 289 list, close all the streams first (again, from the head to the tail), | |
| 290 disconnect the back links, then delete starting from the head. In | |
| 814 | 291 general, it's a good idea to close everything before deleting anything. |
| 771 | 292 |
| 293 NOTE: DO NOT CALL DURING GARBAGE COLLECTION (e.g. in a finalizer). You | |
| 294 will be aborted. See free_managed_lcrecord(). */ | |
| 295 | |
| 428 | 296 void |
| 297 Lstream_delete (Lstream *lstr) | |
| 298 { | |
| 3263 | 299 #ifndef NEW_GC |
| 428 | 300 int i; |
| 3263 | 301 #endif /* not NEW_GC */ |
| 793 | 302 Lisp_Object val = wrap_lstream (lstr); |
| 428 | 303 |
| 3263 | 304 #ifdef NEW_GC |
| 2720 | 305 free_lrecord (val); |
| 3263 | 306 #else /* not NEW_GC */ |
| 428 | 307 for (i = 0; i < lstream_type_count; i++) |
| 308 { | |
| 309 if (lstream_types[i] == lstr->imp) | |
| 310 { | |
| 311 free_managed_lcrecord (Vlstream_free_list[i], val); | |
| 312 return; | |
| 313 } | |
| 314 } | |
| 315 | |
| 2500 | 316 ABORT (); |
| 3263 | 317 #endif /* not NEW_GC */ |
| 428 | 318 } |
| 319 | |
| 320 #define Lstream_internal_error(reason, lstr) \ | |
| 563 | 321 signal_error (Qinternal_error, reason, wrap_lstream (lstr)) |
| 428 | 322 |
| 771 | 323 /* Reopen a closed stream. This enables I/O on it again. This is not |
| 324 meant to be called except from a wrapper routine that reinitializes | |
| 325 variables and such -- the close routine may well have freed some | |
| 326 necessary storage structures, for example. */ | |
| 327 | |
| 428 | 328 void |
| 329 Lstream_reopen (Lstream *lstr) | |
| 330 { | |
| 331 if (lstr->flags & LSTREAM_FL_IS_OPEN) | |
| 332 Lstream_internal_error ("lstream already open", lstr); | |
| 333 lstr->flags |= LSTREAM_FL_IS_OPEN; | |
| 334 } | |
| 335 | |
| 771 | 336 /* Try to write as much of DATA as possible to the stream. Return the |
| 337 number of bytes written. */ | |
| 428 | 338 |
| 771 | 339 static int |
| 340 Lstream_really_write (Lstream *lstr, const unsigned char *data, int size) | |
| 428 | 341 { |
| 665 | 342 Bytecount num_written; |
| 771 | 343 const unsigned char *orig_data = data; |
| 344 int error_occurred = 0; | |
| 428 | 345 |
| 771 | 346 while (size > 0) |
| 428 | 347 { |
| 348 if (! (lstr->flags & LSTREAM_FL_IS_OPEN)) | |
| 349 Lstream_internal_error ("lstream not open", lstr); | |
| 350 if (! (lstr->flags & LSTREAM_FL_WRITE)) | |
| 351 Lstream_internal_error ("lstream not open for writing", lstr); | |
| 352 if (!lstr->imp->writer) | |
| 353 Lstream_internal_error ("lstream has no writer", lstr); | |
| 354 | |
| 355 if (lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS) | |
| 356 /* It's quite possible for us to get passed an incomplete | |
| 357 character at the end. We need to spit back that | |
| 358 incomplete character. */ | |
| 359 { | |
| 442 | 360 const unsigned char *dataend = data + size - 1; |
| 428 | 361 assert (size > 0); /* safety check ... */ |
| 362 /* Optimize the most common case. */ | |
| 826 | 363 if (!byte_ascii_p (*dataend)) |
| 428 | 364 { |
| 365 /* Go back to the beginning of the last (and possibly partial) | |
| 366 character, and bump forward to see if the character is | |
| 367 complete. */ | |
| 867 | 368 VALIDATE_IBYTEPTR_BACKWARD (dataend); |
| 826 | 369 if (dataend + rep_bytes_by_first_byte (*dataend) != data + size) |
| 428 | 370 /* If not, chop the size down to ignore the last char |
| 371 and stash it away for next time. */ | |
| 372 size = dataend - data; | |
| 373 /* If we don't even have one character to write, then just | |
| 374 skip out. */ | |
| 375 if (size == 0) | |
| 376 break; | |
| 377 } | |
| 378 } | |
| 379 | |
| 771 | 380 num_written = (lstr->imp->writer) (lstr, data, size); |
| 428 | 381 if (num_written == 0) |
| 382 /* If nothing got written, then just hold the data. This may | |
| 383 occur, for example, if this stream does non-blocking I/O; | |
| 384 the attempt to write the data might have resulted in an | |
| 385 EWOULDBLOCK error. */ | |
| 771 | 386 break; |
| 387 else if (num_written > size) | |
| 2500 | 388 ABORT (); |
| 428 | 389 else if (num_written > 0) |
| 390 { | |
| 771 | 391 data += num_written; |
| 392 size -= num_written; | |
| 428 | 393 } |
| 394 else | |
| 771 | 395 { |
| 396 /* If error, just hold the data, for similar reasons as above. */ | |
| 397 error_occurred = 1; | |
| 398 break; | |
| 399 } | |
| 428 | 400 } |
| 401 | |
| 2383 | 402 if (!error_occurred && lstr->imp->flusher) |
| 771 | 403 error_occurred = (lstr->imp->flusher) (lstr) < 0; |
| 404 | |
| 405 if (data == orig_data && error_occurred) | |
| 406 return -1; | |
| 407 | |
| 408 return data - orig_data; | |
| 409 } | |
| 410 | |
| 411 /* Attempt to flush out all of the buffered data for writing. Leaves | |
| 412 whatever wasn't flushed sitting in the stream's buffers. Return -1 if | |
| 413 nothing written and error occurred, 0 otherwise. */ | |
| 428 | 414 |
| 771 | 415 int |
| 416 Lstream_flush_out (Lstream *lstr) | |
| 417 { | |
| 418 Bytecount num_written = | |
| 419 Lstream_really_write (lstr, lstr->out_buffer, lstr->out_buffer_ind); | |
| 420 if (num_written == lstr->out_buffer_ind) | |
| 421 { | |
| 422 lstr->out_buffer_ind = 0; | |
| 423 return 0; | |
| 424 } | |
| 425 else if (num_written > 0) | |
| 426 { | |
| 427 memmove (lstr->out_buffer, lstr->out_buffer + num_written, | |
| 428 lstr->out_buffer_ind - num_written); | |
| 429 lstr->out_buffer_ind -= num_written; | |
| 430 return 0; | |
| 431 } | |
| 432 else return num_written; | |
| 428 | 433 } |
| 434 | |
| 771 | 435 /* Flush out any pending unwritten data in the stream. Clear any buffered |
| 436 input data. This differs from Lstream_flush_out() in that it also | |
| 437 clears any unflushable buffered data. Returns 0 on success, -1 on | |
| 438 error. */ | |
| 439 | |
| 428 | 440 int |
| 441 Lstream_flush (Lstream *lstr) | |
| 442 { | |
| 443 if (Lstream_flush_out (lstr) < 0) | |
| 444 return -1; | |
| 445 | |
| 446 /* clear out buffered data */ | |
| 447 lstr->in_buffer_current = lstr->in_buffer_ind = 0; | |
| 448 lstr->unget_buffer_ind = 0; | |
| 449 | |
| 450 return 0; | |
| 451 } | |
| 452 | |
| 453 /* We want to add NUM characters. This function ensures that the | |
| 454 buffer is large enough for this (per the buffering size specified | |
| 455 in the stream) and returns the number of characters we can | |
| 456 actually write. If FORCE is set, ignore the buffering size | |
| 457 and go ahead and make space for all the chars even if it exceeds | |
| 458 the buffering size. (This is used to deal with the possibility | |
| 459 that the stream writer might refuse to write any bytes now, e.g. | |
| 460 if it's getting EWOULDBLOCK errors. We have to keep stocking them | |
| 771 | 461 up until they can be written, so as to avoid losing data.) */ |
| 428 | 462 |
| 665 | 463 static Bytecount |
| 464 Lstream_adding (Lstream *lstr, Bytecount num, int force) | |
| 428 | 465 { |
| 665 | 466 Bytecount size = num + lstr->out_buffer_ind; |
| 430 | 467 |
| 468 if (size <= lstr->out_buffer_size) | |
| 469 return num; | |
| 470 | |
| 428 | 471 /* Maybe chop it down so that we don't buffer more characters |
| 472 than our advertised buffering size. */ | |
| 430 | 473 if ((size > lstr->buffering_size) && !force) |
| 474 { | |
| 475 size = lstr->buffering_size; | |
| 476 /* There might be more data buffered than the buffering size. */ | |
| 477 if (size <= lstr->out_buffer_ind) | |
| 478 return 0; | |
| 479 } | |
| 480 | |
| 481 DO_REALLOC (lstr->out_buffer, lstr->out_buffer_size, size, unsigned char); | |
| 482 | |
| 483 return size - lstr->out_buffer_ind; | |
| 428 | 484 } |
| 485 | |
| 486 /* Like Lstream_write(), but does not handle line-buffering correctly. */ | |
| 487 | |
| 771 | 488 static int |
| 665 | 489 Lstream_write_1 (Lstream *lstr, const void *data, Bytecount size) |
| 428 | 490 { |
| 442 | 491 const unsigned char *p = (const unsigned char *) data; |
| 665 | 492 Bytecount off = 0; |
| 428 | 493 if (! (lstr->flags & LSTREAM_FL_IS_OPEN)) |
| 494 Lstream_internal_error ("lstream not open", lstr); | |
| 495 if (! (lstr->flags & LSTREAM_FL_WRITE)) | |
| 496 Lstream_internal_error ("lstream not open for writing", lstr); | |
| 771 | 497 |
| 498 if (lstr->buffering == LSTREAM_UNBUFFERED) | |
| 499 { | |
| 500 /* If there is buffered data, it means we ran into blocking | |
| 501 errors the previous time and had to buffer our remaining | |
| 502 data. Try to write it now. */ | |
| 503 if (lstr->out_buffer_ind > 0) | |
| 504 { | |
| 505 if (Lstream_flush_out (lstr) < 0) | |
| 506 return -1; | |
| 507 } | |
| 508 | |
| 509 /* If not still blocked, try to write the new data */ | |
| 510 if (lstr->out_buffer_ind == 0) | |
| 511 { | |
| 512 /* we don't need to loop because Lstream_really_write does that | |
| 513 for us. */ | |
| 514 Bytecount num_written = Lstream_really_write (lstr, p, size); | |
| 515 if (num_written < 0) | |
| 516 return -1; | |
| 517 off += num_written; | |
| 518 } | |
| 519 | |
| 520 /* squirrel away the rest of the data */ | |
| 521 if (off < size) | |
| 522 { | |
| 523 Lstream_adding (lstr, size - off, 1); | |
| 524 memcpy (lstr->out_buffer + lstr->out_buffer_ind, p + off, | |
| 525 size - off); | |
| 526 lstr->out_buffer_ind += size - off; | |
| 527 } | |
| 528 | |
| 529 lstr->byte_count += size; | |
| 530 return 0; | |
| 531 } | |
| 532 else | |
| 533 { | |
| 534 int couldnt_write_last_time = 0; | |
| 428 | 535 |
| 771 | 536 while (1) |
| 537 { | |
| 538 /* Figure out how much we can add to the buffer */ | |
| 539 Bytecount chunk = Lstream_adding (lstr, size, 0); | |
| 540 if (chunk == 0) | |
| 541 { | |
| 542 if (couldnt_write_last_time) | |
| 543 /* Ung, we ran out of space and tried to flush | |
| 544 the buffer, but it didn't work because the stream | |
| 545 writer is refusing to accept any data. So we | |
| 546 just have to squirrel away all the rest of the | |
| 547 stuff. */ | |
| 548 chunk = Lstream_adding (lstr, size, 1); | |
| 549 else | |
| 550 couldnt_write_last_time = 1; | |
| 551 } | |
| 552 /* Do it. */ | |
| 553 if (chunk > 0) | |
| 554 { | |
| 555 memcpy (lstr->out_buffer + lstr->out_buffer_ind, p + off, chunk); | |
| 556 lstr->out_buffer_ind += chunk; | |
| 557 lstr->byte_count += chunk; | |
| 558 size -= chunk; | |
| 559 off += chunk; | |
| 560 } | |
| 561 /* If the buffer is full and we have more to add, flush it out. */ | |
| 562 if (size > 0) | |
| 563 { | |
| 564 if (Lstream_flush_out (lstr) < 0) | |
| 565 { | |
| 566 if (off == 0) | |
| 567 return -1; | |
| 568 else | |
| 569 return 0; | |
| 570 } | |
| 571 } | |
| 572 else | |
| 573 break; | |
| 574 } | |
| 575 } | |
| 576 return 0; | |
| 428 | 577 } |
| 578 | |
| 771 | 579 /* Write SIZE bytes of DATA to the stream. Return value is 0 on success, |
| 580 -1 on error. -1 is only returned when no bytes could be written; if any | |
| 581 bytes could be written, then 0 is returned and any unwritten bytes are | |
| 582 buffered and the next call to Lstream_write() will try to write them | |
| 583 again. (This buffering happens even when the stream's buffering type is | |
| 584 LSTREAM_UNBUFFERED, and regardless of how much data is passed in or what | |
| 585 the stream's buffering size was set to. #### There should perhaps be a | |
| 586 way to control whether this happens.) */ | |
| 428 | 587 |
| 771 | 588 int |
| 665 | 589 Lstream_write (Lstream *lstr, const void *data, Bytecount size) |
| 428 | 590 { |
| 665 | 591 Bytecount i; |
| 442 | 592 const unsigned char *p = (const unsigned char *) data; |
| 428 | 593 |
| 771 | 594 /* If the stream is not line-buffered, then we can just call |
| 595 Lstream_write_1(), which writes in chunks. Otherwise, we repeatedly | |
| 596 call Lstream_putc(), which knows how to handle line buffering. | |
| 597 Returns 0 on success, -1 on failure. */ | |
| 598 | |
| 428 | 599 if (size == 0) |
| 771 | 600 return 0; |
| 428 | 601 if (lstr->buffering != LSTREAM_LINE_BUFFERED) |
| 602 return Lstream_write_1 (lstr, data, size); | |
| 603 for (i = 0; i < size; i++) | |
| 604 { | |
| 605 if (Lstream_putc (lstr, p[i]) < 0) | |
| 606 break; | |
| 607 } | |
| 771 | 608 return i == 0 ? -1 : 0; |
| 428 | 609 } |
| 610 | |
| 611 int | |
| 612 Lstream_was_blocked_p (Lstream *lstr) | |
| 613 { | |
| 614 return lstr->imp->was_blocked_p ? lstr->imp->was_blocked_p (lstr) : 0; | |
| 615 } | |
| 616 | |
| 665 | 617 static Bytecount |
| 462 | 618 Lstream_raw_read (Lstream *lstr, unsigned char *buffer, |
| 665 | 619 Bytecount size) |
| 428 | 620 { |
| 621 if (! (lstr->flags & LSTREAM_FL_IS_OPEN)) | |
| 622 Lstream_internal_error ("lstream not open", lstr); | |
| 623 if (! (lstr->flags & LSTREAM_FL_READ)) | |
| 624 Lstream_internal_error ("lstream not open for reading", lstr); | |
| 625 if (!lstr->imp->reader) | |
| 626 Lstream_internal_error ("lstream has no reader", lstr); | |
| 627 | |
| 628 return (lstr->imp->reader) (lstr, buffer, size); | |
| 629 } | |
| 630 | |
| 631 /* Assuming the buffer is empty, fill it up again. */ | |
| 632 | |
| 665 | 633 static Bytecount |
| 428 | 634 Lstream_read_more (Lstream *lstr) |
| 635 { | |
| 636 #if 0 | |
| 665 | 637 Bytecount size_needed |
| 462 | 638 = max (1, min (MAX_READ_SIZE, lstr->buffering_size)); |
| 428 | 639 #else |
| 640 /* If someone requested a larger buffer size, so be it! */ | |
| 665 | 641 Bytecount size_needed = |
| 462 | 642 max (1, lstr->buffering_size); |
| 428 | 643 #endif |
| 665 | 644 Bytecount size_gotten; |
| 428 | 645 |
| 646 DO_REALLOC (lstr->in_buffer, lstr->in_buffer_size, | |
| 647 size_needed, unsigned char); | |
| 648 size_gotten = Lstream_raw_read (lstr, lstr->in_buffer, size_needed); | |
| 649 lstr->in_buffer_current = max (0, size_gotten); | |
| 650 lstr->in_buffer_ind = 0; | |
| 651 return size_gotten < 0 ? -1 : size_gotten; | |
| 652 } | |
| 653 | |
| 771 | 654 /* Read SIZE bytes of DATA from the stream. Return the number of bytes |
| 655 read. 0 means EOF (#### sometimes; it may simply indicate we can't read | |
| 656 any data at other times, particularly if SIZE is too small. this needs | |
| 657 to be fixed!). -1 means an error occurred and no bytes were read. */ | |
| 658 | |
| 814 | 659 static Bytecount |
| 660 Lstream_read_1 (Lstream *lstr, void *data, Bytecount size, | |
| 661 int override_no_partial_chars) | |
| 428 | 662 { |
| 663 unsigned char *p = (unsigned char *) data; | |
| 665 | 664 Bytecount off = 0; |
| 665 Bytecount chunk; | |
| 428 | 666 int error_occurred = 0; |
| 667 | |
| 668 if (size == 0) | |
| 669 return 0; | |
| 670 | |
| 671 /* First try to get some data from the unget buffer */ | |
| 672 chunk = min (size, lstr->unget_buffer_ind); | |
| 673 if (chunk > 0) | |
| 674 { | |
| 675 /* The bytes come back in reverse order. */ | |
| 676 for (; off < chunk; off++) | |
| 677 p[off] = lstr->unget_buffer[--lstr->unget_buffer_ind]; | |
| 678 lstr->byte_count += chunk; | |
| 679 size -= chunk; | |
| 680 } | |
| 681 | |
| 682 while (size > 0) | |
| 683 { | |
| 771 | 684 /* If unbuffered, then simply read directly into output buffer. |
| 685 No need to copy. */ | |
| 686 if (lstr->buffering == LSTREAM_UNBUFFERED) | |
| 687 { | |
| 688 chunk = Lstream_raw_read (lstr, p + off, size); | |
| 689 if (chunk < 0) | |
| 690 error_occurred = 1; | |
| 691 if (chunk <= 0) | |
| 692 break; | |
| 693 lstr->byte_count += chunk; | |
| 428 | 694 size -= chunk; |
| 771 | 695 off += chunk; |
| 696 } | |
| 697 else | |
| 428 | 698 { |
| 771 | 699 /* Take whatever we can from the in buffer */ |
| 700 chunk = min (size, lstr->in_buffer_current - lstr->in_buffer_ind); | |
| 701 if (chunk > 0) | |
| 702 { | |
| 703 memcpy (p + off, lstr->in_buffer + lstr->in_buffer_ind, chunk); | |
| 704 lstr->in_buffer_ind += chunk; | |
| 705 lstr->byte_count += chunk; | |
| 706 size -= chunk; | |
| 707 off += chunk; | |
| 708 } | |
| 709 | |
| 710 /* If we need some more, try to get some more from the | |
| 711 stream's end */ | |
| 712 if (size > 0) | |
| 713 { | |
| 714 Bytecount retval = Lstream_read_more (lstr); | |
| 715 if (retval < 0) | |
| 716 error_occurred = 1; | |
| 717 if (retval <= 0) | |
| 718 break; | |
| 719 } | |
| 428 | 720 } |
| 721 } | |
| 722 | |
| 814 | 723 if ((lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS) && |
| 724 !override_no_partial_chars) | |
| 428 | 725 { |
| 726 /* It's quite possible for us to get passed an incomplete | |
| 727 character at the end. We need to spit back that | |
| 728 incomplete character. */ | |
| 867 | 729 Bytecount newoff = validate_ibyte_string_backward (p, off); |
| 771 | 730 if (newoff < off) |
| 428 | 731 { |
| 771 | 732 Lstream_unread (lstr, p + newoff, off - newoff); |
| 733 off = newoff; | |
| 428 | 734 } |
| 735 } | |
| 736 | |
| 462 | 737 return off == 0 && error_occurred ? -1 : off; |
| 428 | 738 } |
| 739 | |
| 814 | 740 Bytecount |
| 741 Lstream_read (Lstream *lstr, void *data, Bytecount size) | |
| 742 { | |
| 743 return Lstream_read_1 (lstr, data, size, 0); | |
| 744 } | |
| 745 | |
| 746 | |
| 771 | 747 /* Push back SIZE bytes of DATA onto the input queue. The next call |
| 748 to Lstream_read() with the same size will read the same bytes back. | |
| 749 Note that this will be the case even if there is other pending | |
| 750 unread data. */ | |
| 751 | |
| 428 | 752 void |
| 665 | 753 Lstream_unread (Lstream *lstr, const void *data, Bytecount size) |
| 428 | 754 { |
| 442 | 755 const unsigned char *p = (const unsigned char *) data; |
| 428 | 756 |
| 757 /* Make sure buffer is big enough */ | |
| 758 DO_REALLOC (lstr->unget_buffer, lstr->unget_buffer_size, | |
| 759 lstr->unget_buffer_ind + size, unsigned char); | |
| 760 | |
| 761 lstr->byte_count -= size; | |
| 762 | |
| 763 /* Bytes have to go on in reverse order -- they are reversed | |
| 764 again when read back. */ | |
| 765 while (size--) | |
| 766 lstr->unget_buffer[lstr->unget_buffer_ind++] = p[size]; | |
| 767 } | |
| 768 | |
| 771 | 769 /* Rewind the stream to the beginning. */ |
| 770 | |
| 428 | 771 int |
| 772 Lstream_rewind (Lstream *lstr) | |
| 773 { | |
| 774 if (!lstr->imp->rewinder) | |
| 775 Lstream_internal_error ("lstream has no rewinder", lstr); | |
| 776 if (Lstream_flush (lstr) < 0) | |
| 777 return -1; | |
| 778 lstr->byte_count = 0; | |
| 779 return (lstr->imp->rewinder) (lstr); | |
| 780 } | |
| 781 | |
| 782 int | |
| 783 Lstream_seekable_p (Lstream *lstr) | |
| 784 { | |
| 785 if (!lstr->imp->rewinder) | |
| 786 return 0; | |
| 787 if (!lstr->imp->seekable_p) | |
| 788 return 1; | |
| 789 return (lstr->imp->seekable_p) (lstr); | |
| 790 } | |
| 791 | |
| 792 static int | |
| 793 Lstream_pseudo_close (Lstream *lstr) | |
| 794 { | |
| 1943 | 795 if (! (lstr->flags & LSTREAM_FL_IS_OPEN)) |
| 428 | 796 Lstream_internal_error ("lstream is not open", lstr); |
| 797 | |
| 798 /* don't check errors here -- best not to risk file descriptor loss */ | |
| 799 return Lstream_flush (lstr); | |
| 800 } | |
| 801 | |
| 771 | 802 /* Close the stream. All data will be flushed out. If the stream is |
| 803 already closed, nothing happens. Note that, even if all data has | |
| 804 already been flushed out, the act of closing a stream may generate more | |
| 805 data -- for example, if the stream implements some sort of conversion, | |
| 806 such as gzip, there may be special "end-data" that need to be written | |
| 807 out when the file is closed. */ | |
| 808 | |
| 428 | 809 int |
| 810 Lstream_close (Lstream *lstr) | |
| 811 { | |
| 812 int rc = 0; | |
| 813 | |
| 814 if (lstr->flags & LSTREAM_FL_IS_OPEN) | |
| 815 { | |
| 816 rc = Lstream_pseudo_close (lstr); | |
| 817 /* | |
| 818 * We used to return immediately if the closer method reported | |
| 819 * failure, leaving the stream open. But this is no good, for | |
| 820 * the following reasons. | |
| 821 * | |
| 822 * 1. The finalizer method used in GC makes no provision for | |
| 823 * failure, so we must not return without freeing buffer | |
| 824 * memory. | |
| 825 * | |
| 826 * 2. The closer method may have already freed some memory | |
| 827 * used for I/O in this stream. E.g. encoding_closer frees | |
| 828 * ENCODING_STREAM_DATA(stream)->runoff. If a writer method | |
| 829 * tries to use this buffer later, it will write into memory | |
| 830 * that may have been allocated elsewhere. Sometime later | |
| 831 * you will see a sign that says "Welcome to Crash City." | |
| 832 * | |
| 833 * 3. The closer can report failure if a flush fails in the | |
| 834 * other stream in a MULE encoding/decoding stream pair. | |
| 835 * The other stream in the pair is closed, but returning | |
| 836 * early leaves the current stream open. If we try to | |
| 837 * flush the current stream later, we will crash when the | |
| 838 * flusher notices that the other end stream is closed. | |
| 839 * | |
| 840 * So, we no longer abort the close if the closer method | |
| 841 * reports some kind of failure. We still report the failure | |
| 842 * to the caller. | |
| 843 */ | |
| 844 if (lstr->imp->closer) | |
| 845 if ((lstr->imp->closer) (lstr) < 0) | |
| 846 rc = -1; | |
| 847 } | |
| 848 | |
| 849 lstr->flags &= ~LSTREAM_FL_IS_OPEN; | |
| 850 lstr->byte_count = 0; | |
| 851 /* Note that Lstream_flush() reset all the buffer indices. That way, | |
| 852 the next call to Lstream_putc(), Lstream_getc(), or Lstream_ungetc() | |
| 853 on a closed stream will call into the function equivalents, which will | |
| 854 cause an error. */ | |
| 855 | |
| 856 /* We set the pointers to 0 so that we don't lose when this function | |
| 857 is called more than once on the same object */ | |
| 858 if (lstr->out_buffer) | |
| 859 { | |
|
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diff
changeset
|
860 xfree (lstr->out_buffer); |
| 428 | 861 lstr->out_buffer = 0; |
| 862 } | |
| 863 if (lstr->in_buffer) | |
| 864 { | |
|
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parents:
3263
diff
changeset
|
865 xfree (lstr->in_buffer); |
| 428 | 866 lstr->in_buffer = 0; |
| 867 } | |
| 868 if (lstr->unget_buffer) | |
| 869 { | |
|
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Ben Wing <ben@xemacs.org>
parents:
3263
diff
changeset
|
870 xfree (lstr->unget_buffer); |
| 428 | 871 lstr->unget_buffer = 0; |
| 872 } | |
| 873 | |
| 874 return rc; | |
| 875 } | |
| 876 | |
| 771 | 877 |
| 878 /* Function equivalent of Lstream_putc(). */ | |
| 879 | |
| 428 | 880 int |
| 881 Lstream_fputc (Lstream *lstr, int c) | |
| 882 { | |
| 883 unsigned char ch = (unsigned char) c; | |
| 771 | 884 int retval = Lstream_write_1 (lstr, &ch, 1); |
| 885 if (retval == 0 && lstr->buffering == LSTREAM_LINE_BUFFERED && ch == '\n') | |
| 428 | 886 return Lstream_flush_out (lstr); |
| 771 | 887 return retval; |
| 428 | 888 } |
| 889 | |
| 771 | 890 /* Function equivalent of Lstream_getc(). */ |
| 891 | |
| 428 | 892 int |
| 893 Lstream_fgetc (Lstream *lstr) | |
| 894 { | |
| 895 unsigned char ch; | |
| 814 | 896 if (Lstream_read_1 (lstr, &ch, 1, 1) <= 0) |
| 428 | 897 return -1; |
| 898 return ch; | |
| 899 } | |
| 900 | |
| 771 | 901 /* Function equivalent of Lstream_ungetc(). */ |
| 902 | |
| 428 | 903 void |
| 904 Lstream_fungetc (Lstream *lstr, int c) | |
| 905 { | |
| 906 unsigned char ch = (unsigned char) c; | |
| 907 Lstream_unread (lstr, &ch, 1); | |
| 908 } | |
| 909 | |
| 910 | |
| 911 /************************ some stream implementations *********************/ | |
| 912 | |
| 913 /*********** a stdio stream ***********/ | |
| 914 | |
| 915 struct stdio_stream | |
| 916 { | |
| 917 FILE *file; | |
| 918 int closing; | |
| 919 }; | |
| 920 | |
| 921 #define STDIO_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, stdio) | |
| 922 | |
| 771 | 923 DEFINE_LSTREAM_IMPLEMENTATION ("stdio", stdio); |
| 428 | 924 |
| 925 static Lisp_Object | |
| 442 | 926 make_stdio_stream_1 (FILE *stream, int flags, const char *mode) |
| 428 | 927 { |
| 928 Lstream *lstr = Lstream_new (lstream_stdio, mode); | |
| 929 struct stdio_stream *str = STDIO_STREAM_DATA (lstr); | |
| 930 str->file = stream; | |
| 931 str->closing = flags & LSTR_CLOSING; | |
| 932 lstr->flags |= LSTREAM_FL_CLOSE_AT_DISKSAVE; | |
| 793 | 933 return wrap_lstream (lstr); |
| 428 | 934 } |
| 935 | |
| 936 Lisp_Object | |
| 937 make_stdio_input_stream (FILE *stream, int flags) | |
| 938 { | |
| 939 return make_stdio_stream_1 (stream, flags, "r"); | |
| 940 } | |
| 941 | |
| 942 Lisp_Object | |
| 943 make_stdio_output_stream (FILE *stream, int flags) | |
| 944 { | |
| 945 return make_stdio_stream_1 (stream, flags, "w"); | |
| 946 } | |
| 947 | |
| 948 /* #### From reading the Unix 98 specification, it appears that if we | |
| 949 want stdio_reader() to be completely correct, we should check for | |
| 950 0 < val < size and if so, check to see if an error has occurred. | |
| 951 If an error has occurred, but val is non-zero, we should go ahead | |
| 952 and act as if the read was successful, but remember in some fashion | |
| 953 or other, that an error has occurred, and report that on the next | |
| 771 | 954 call to stdio_reader instead of calling retry_fread() again. |
| 428 | 955 |
| 771 | 956 Currently, in such a case, we end up calling retry_fread() twice and we |
| 428 | 957 assume that |
| 958 | |
| 959 1) this is not harmful, and | |
| 960 2) the error will still be reported on the second read. | |
| 961 | |
| 962 This is probably reasonable, so I don't think we should change this | |
| 963 code (it could even be argued that the error might have fixed | |
| 771 | 964 itself, so we should do the retry_fread() again. */ |
| 428 | 965 |
| 665 | 966 static Bytecount |
| 967 stdio_reader (Lstream *stream, unsigned char *data, Bytecount size) | |
| 428 | 968 { |
| 969 struct stdio_stream *str = STDIO_STREAM_DATA (stream); | |
| 771 | 970 Bytecount val = retry_fread (data, 1, size, str->file); |
| 971 if (!val) | |
| 972 { | |
| 973 if (ferror (str->file)) | |
| 974 return LSTREAM_ERROR; | |
| 975 if (feof (str->file)) | |
| 976 return 0; /* LSTREAM_EOF; */ | |
| 977 } | |
| 428 | 978 return val; |
| 979 } | |
| 980 | |
| 665 | 981 static Bytecount |
| 462 | 982 stdio_writer (Lstream *stream, const unsigned char *data, |
| 665 | 983 Bytecount size) |
| 428 | 984 { |
| 985 struct stdio_stream *str = STDIO_STREAM_DATA (stream); | |
| 771 | 986 Bytecount val = retry_fwrite (data, 1, size, str->file); |
| 428 | 987 if (!val && ferror (str->file)) |
| 771 | 988 return LSTREAM_ERROR; |
| 428 | 989 return val; |
| 990 } | |
| 991 | |
| 992 static int | |
| 993 stdio_rewinder (Lstream *stream) | |
| 994 { | |
| 995 rewind (STDIO_STREAM_DATA (stream)->file); | |
| 996 return 0; | |
| 997 } | |
| 998 | |
| 999 static int | |
| 1000 stdio_seekable_p (Lstream *stream) | |
| 1001 { | |
| 1002 struct stat lestat; | |
| 1003 struct stdio_stream *str = STDIO_STREAM_DATA (stream); | |
| 1004 | |
| 771 | 1005 if (qxe_fstat (fileno (str->file), &lestat) < 0) |
| 428 | 1006 return 0; |
| 1007 return S_ISREG (lestat.st_mode); | |
| 1008 } | |
| 1009 | |
| 1010 static int | |
| 1011 stdio_flusher (Lstream *stream) | |
| 1012 { | |
| 1013 struct stdio_stream *str = STDIO_STREAM_DATA (stream); | |
| 1014 if (stream->flags & LSTREAM_FL_WRITE) | |
| 1015 return fflush (str->file); | |
| 1016 else | |
| 1017 return 0; | |
| 1018 } | |
| 1019 | |
| 1020 static int | |
| 1021 stdio_closer (Lstream *stream) | |
| 1022 { | |
| 1023 struct stdio_stream *str = STDIO_STREAM_DATA (stream); | |
| 1024 if (str->closing) | |
| 771 | 1025 return retry_fclose (str->file); |
| 428 | 1026 else |
| 1027 if (stream->flags & LSTREAM_FL_WRITE) | |
| 1028 return fflush (str->file); | |
| 1029 else | |
| 1030 return 0; | |
| 1031 } | |
| 1032 | |
| 1033 /*********** a file descriptor ***********/ | |
| 1034 | |
| 1035 struct filedesc_stream | |
| 1036 { | |
| 1037 int fd; | |
| 1038 int pty_max_bytes; | |
| 867 | 1039 Ibyte eof_char; |
| 428 | 1040 int starting_pos; |
| 1041 int current_pos; | |
| 1042 int end_pos; | |
| 1043 int chars_sans_newline; | |
| 1044 unsigned int closing :1; | |
| 1045 unsigned int allow_quit :1; | |
| 1046 unsigned int blocked_ok :1; | |
| 1047 unsigned int pty_flushing :1; | |
| 1048 unsigned int blocking_error_p :1; | |
| 1049 }; | |
| 1050 | |
| 1051 #define FILEDESC_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, filedesc) | |
| 1052 | |
| 771 | 1053 DEFINE_LSTREAM_IMPLEMENTATION ("filedesc", filedesc); |
| 428 | 1054 |
| 1055 /* Make a stream that reads from or writes to a file descriptor FILEDESC. | |
| 1056 OFFSET is the offset from the *current* file pointer that the reading | |
| 1057 should start at. COUNT is the number of bytes to be read (it is | |
| 1058 ignored when writing); -1 for unlimited. */ | |
| 1059 static Lisp_Object | |
| 1060 make_filedesc_stream_1 (int filedesc, int offset, int count, int flags, | |
| 442 | 1061 const char *mode) |
| 428 | 1062 { |
| 1063 Lstream *lstr = Lstream_new (lstream_filedesc, mode); | |
| 1064 struct filedesc_stream *fstr = FILEDESC_STREAM_DATA (lstr); | |
| 1065 fstr->fd = filedesc; | |
| 1066 fstr->closing = !!(flags & LSTR_CLOSING); | |
| 1067 fstr->allow_quit = !!(flags & LSTR_ALLOW_QUIT); | |
| 1068 fstr->blocked_ok = !!(flags & LSTR_BLOCKED_OK); | |
| 1069 fstr->pty_flushing = !!(flags & LSTR_PTY_FLUSHING); | |
| 1070 fstr->blocking_error_p = 0; | |
| 1071 fstr->chars_sans_newline = 0; | |
| 1072 fstr->starting_pos = lseek (filedesc, offset, SEEK_CUR); | |
| 1073 fstr->current_pos = max (fstr->starting_pos, 0); | |
| 1074 if (count < 0) | |
| 1075 fstr->end_pos = -1; | |
| 1076 else | |
| 1077 fstr->end_pos = fstr->starting_pos + count; | |
| 1078 lstr->flags |= LSTREAM_FL_CLOSE_AT_DISKSAVE; | |
| 793 | 1079 return wrap_lstream (lstr); |
| 428 | 1080 } |
| 1081 | |
| 814 | 1082 /* Flags: |
| 1083 | |
| 1084 LSTR_CLOSING | |
| 1085 If set, close the descriptor or FILE * when the stream is closed. | |
| 1086 | |
| 1087 LSTR_ALLOW_QUIT | |
| 1088 If set, allow quitting out of the actual I/O. | |
| 1089 | |
| 1090 LSTR_PTY_FLUSHING | |
| 1091 If set and filedesc_stream_set_pty_flushing() has been called | |
| 1092 on the stream, do not send more than pty_max_bytes on a single | |
| 1093 line without flushing the data out using the eof_char. | |
| 1094 | |
| 1095 LSTR_BLOCKED_OK | |
| 1096 If set, an EWOULDBLOCK error is not treated as an error but | |
| 1097 simply causes the write function to return 0 as the number | |
| 1098 of bytes written out. | |
| 1099 */ | |
| 1100 | |
| 428 | 1101 Lisp_Object |
| 1102 make_filedesc_input_stream (int filedesc, int offset, int count, int flags) | |
| 1103 { | |
| 1104 return make_filedesc_stream_1 (filedesc, offset, count, flags, "r"); | |
| 1105 } | |
| 1106 | |
| 1107 Lisp_Object | |
| 1108 make_filedesc_output_stream (int filedesc, int offset, int count, int flags) | |
| 1109 { | |
| 1110 return make_filedesc_stream_1 (filedesc, offset, count, flags, "w"); | |
| 1111 } | |
| 1112 | |
| 665 | 1113 static Bytecount |
| 1114 filedesc_reader (Lstream *stream, unsigned char *data, Bytecount size) | |
| 428 | 1115 { |
| 665 | 1116 Bytecount nread; |
| 428 | 1117 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); |
| 1118 if (str->end_pos >= 0) | |
| 665 | 1119 size = min (size, (Bytecount) (str->end_pos - str->current_pos)); |
| 430 | 1120 nread = str->allow_quit ? |
| 1121 read_allowing_quit (str->fd, data, size) : | |
| 771 | 1122 retry_read (str->fd, data, size); |
| 428 | 1123 if (nread > 0) |
| 1124 str->current_pos += nread; | |
| 771 | 1125 if (nread == 0) |
| 1126 return 0; /* LSTREAM_EOF; */ | |
| 1127 if (nread < 0) | |
| 1128 return LSTREAM_ERROR; | |
| 428 | 1129 return nread; |
| 1130 } | |
| 1131 | |
| 1132 static int | |
| 1133 errno_would_block_p (int val) | |
| 1134 { | |
| 1135 #ifdef EWOULDBLOCK | |
| 1136 if (val == EWOULDBLOCK) | |
| 1137 return 1; | |
| 1138 #endif | |
| 1139 #ifdef EAGAIN | |
| 1140 if (val == EAGAIN) | |
| 1141 return 1; | |
| 1142 #endif | |
| 1143 return 0; | |
| 1144 } | |
| 1145 | |
| 665 | 1146 static Bytecount |
| 462 | 1147 filedesc_writer (Lstream *stream, const unsigned char *data, |
| 665 | 1148 Bytecount size) |
| 428 | 1149 { |
| 1150 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 665 | 1151 Bytecount retval; |
| 428 | 1152 int need_newline = 0; |
| 1153 | |
| 1154 /* This function would be simple if it were not for the blasted | |
| 1155 PTY max-bytes stuff. Why the hell can't they just have written | |
| 1156 the PTY drivers right so this problem doesn't exist? | |
| 1157 | |
| 1158 Maybe all the PTY crap here should be moved into another stream | |
| 1159 that does nothing but periodically insert EOF's as necessary. */ | |
| 1160 if (str->pty_flushing) | |
| 1161 { | |
| 1162 /* To make life easy, only send out one line at the most. */ | |
| 442 | 1163 const unsigned char *ptr; |
| 428 | 1164 |
| 442 | 1165 ptr = (const unsigned char *) memchr (data, '\n', size); |
| 428 | 1166 if (ptr) |
| 1167 need_newline = 1; | |
| 1168 else | |
| 1169 ptr = data + size; | |
| 1170 if (ptr - data >= str->pty_max_bytes - str->chars_sans_newline) | |
| 1171 { | |
| 1172 ptr = data + str->pty_max_bytes - str->chars_sans_newline; | |
| 1173 need_newline = 0; | |
| 1174 } | |
| 1175 size = ptr - data; | |
| 1176 } | |
| 1177 | |
| 1178 /**** start of non-PTY-crap ****/ | |
| 1179 if (size > 0) | |
| 430 | 1180 retval = str->allow_quit ? |
| 1181 write_allowing_quit (str->fd, data, size) : | |
| 771 | 1182 retry_write (str->fd, data, size); |
| 428 | 1183 else |
| 1184 retval = 0; | |
| 1185 if (retval < 0 && errno_would_block_p (errno) && str->blocked_ok) | |
| 1186 { | |
| 1187 str->blocking_error_p = 1; | |
| 1188 return 0; | |
| 1189 } | |
| 1190 str->blocking_error_p = 0; | |
| 1191 if (retval < 0) | |
| 771 | 1192 return LSTREAM_ERROR; |
| 428 | 1193 /**** end non-PTY-crap ****/ |
| 1194 | |
| 1195 if (str->pty_flushing) | |
| 1196 { | |
| 1197 str->chars_sans_newline += retval; | |
| 1198 /* Note that a newline was not among the bytes written out. | |
| 1199 Add to the number of non-newline bytes written out, | |
| 1200 and flush with an EOF if necessary. Be careful to | |
| 1201 keep track of write errors as we go along and look | |
| 1202 out for EWOULDBLOCK. */ | |
| 1203 if (str->chars_sans_newline >= str->pty_max_bytes) | |
| 1204 { | |
| 665 | 1205 Bytecount retval2 = str->allow_quit ? |
| 430 | 1206 write_allowing_quit (str->fd, &str->eof_char, 1) : |
| 771 | 1207 retry_write (str->fd, &str->eof_char, 1); |
| 430 | 1208 |
| 428 | 1209 if (retval2 > 0) |
| 1210 str->chars_sans_newline = 0; | |
| 1211 else if (retval2 < 0) | |
| 1212 { | |
| 1213 /* Error writing the EOF char. If nothing got written, | |
| 1214 then treat this as an error -- either return an error | |
| 1215 condition or set the blocking-error flag. */ | |
| 1216 if (retval == 0) | |
| 1217 { | |
| 1218 if (errno_would_block_p (errno) && str->blocked_ok) | |
| 1219 { | |
| 1220 str->blocking_error_p = 1; | |
| 1221 return 0; | |
| 1222 } | |
| 1223 else | |
| 771 | 1224 return LSTREAM_ERROR; |
| 428 | 1225 } |
| 1226 else | |
| 1227 return retval; | |
| 1228 } | |
| 1229 } | |
| 1230 } | |
| 1231 | |
| 1232 /* The need_newline flag is necessary because otherwise when the | |
| 1233 first byte is a newline, we'd get stuck never writing anything | |
| 1234 in pty-flushing mode. */ | |
| 1235 if (need_newline) | |
| 1236 { | |
| 867 | 1237 Ibyte nl = '\n'; |
| 665 | 1238 Bytecount retval2 = str->allow_quit ? |
| 430 | 1239 write_allowing_quit (str->fd, &nl, 1) : |
| 771 | 1240 retry_write (str->fd, &nl, 1); |
| 430 | 1241 |
| 428 | 1242 if (retval2 > 0) |
| 1243 { | |
| 1244 str->chars_sans_newline = 0; | |
| 1245 retval++; | |
| 1246 } | |
| 1247 else if (retval2 < 0) | |
| 1248 { | |
| 1249 /* Error writing the newline char. If nothing got written, | |
| 1250 then treat this as an error -- either return an error | |
| 1251 condition or set the blocking-error flag. */ | |
| 1252 if (retval == 0) | |
| 1253 { | |
| 1254 if (errno_would_block_p (errno) && str->blocked_ok) | |
| 1255 { | |
| 1256 str->blocking_error_p = 1; | |
| 1257 return 0; | |
| 1258 } | |
| 1259 else | |
| 771 | 1260 return LSTREAM_ERROR; |
| 428 | 1261 } |
| 1262 else | |
| 1263 return retval; | |
| 1264 } | |
| 1265 } | |
| 1266 | |
| 1267 return retval; | |
| 1268 } | |
| 1269 | |
| 1270 static int | |
| 1271 filedesc_rewinder (Lstream *stream) | |
| 1272 { | |
| 1273 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1274 if (str->starting_pos < 0 || | |
| 1275 lseek (FILEDESC_STREAM_DATA (stream)->fd, str->starting_pos, | |
| 1276 SEEK_SET) == -1) | |
| 1277 return -1; | |
| 1278 else | |
| 1279 { | |
| 1280 str->current_pos = str->starting_pos; | |
| 1281 return 0; | |
| 1282 } | |
| 1283 } | |
| 1284 | |
| 1285 static int | |
| 1286 filedesc_seekable_p (Lstream *stream) | |
| 1287 { | |
| 1288 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1289 if (str->starting_pos < 0) | |
| 1290 return 0; | |
| 1291 else | |
| 1292 { | |
| 1293 struct stat lestat; | |
| 1294 | |
| 771 | 1295 if (qxe_fstat (str->fd, &lestat) < 0) |
| 428 | 1296 return 0; |
| 1297 return S_ISREG (lestat.st_mode); | |
| 1298 } | |
| 1299 } | |
| 1300 | |
| 1301 static int | |
| 1302 filedesc_closer (Lstream *stream) | |
| 1303 { | |
| 1304 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1305 if (str->closing) | |
| 771 | 1306 return retry_close (str->fd); |
| 428 | 1307 else |
| 1308 return 0; | |
| 1309 } | |
| 1310 | |
| 1311 static int | |
| 1312 filedesc_was_blocked_p (Lstream *stream) | |
| 1313 { | |
| 1314 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1315 return str->blocking_error_p; | |
| 1316 } | |
| 1317 | |
| 1318 void | |
| 1319 filedesc_stream_set_pty_flushing (Lstream *stream, int pty_max_bytes, | |
| 867 | 1320 Ibyte eof_char) |
| 428 | 1321 { |
| 1322 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1323 str->pty_max_bytes = pty_max_bytes; | |
| 1324 str->eof_char = eof_char; | |
| 1325 str->pty_flushing = 1; | |
| 1326 } | |
| 1327 | |
| 1328 int | |
| 1329 filedesc_stream_fd (Lstream *stream) | |
| 1330 { | |
| 1331 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1332 return str->fd; | |
| 1333 } | |
| 1334 | |
| 1335 /*********** read from a Lisp string ***********/ | |
| 1336 | |
| 1337 #define LISP_STRING_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, lisp_string) | |
| 1338 | |
| 1339 struct lisp_string_stream | |
| 1340 { | |
| 1341 Lisp_Object obj; | |
| 1342 Bytecount init_offset; | |
| 1343 Bytecount offset, end; | |
| 1344 }; | |
| 1345 | |
| 1204 | 1346 static const struct memory_description lisp_string_lstream_description[] = { |
| 1347 { XD_LISP_OBJECT, offsetof (struct lisp_string_stream, obj) }, | |
| 1348 { XD_END } | |
| 1349 }; | |
| 1350 | |
| 1351 DEFINE_LSTREAM_IMPLEMENTATION_WITH_DATA ("lisp-string", lisp_string); | |
| 428 | 1352 |
| 1353 Lisp_Object | |
| 1354 make_lisp_string_input_stream (Lisp_Object string, Bytecount offset, | |
| 1355 Bytecount len) | |
| 1356 { | |
| 1357 Lstream *lstr; | |
| 1358 struct lisp_string_stream *str; | |
| 1359 | |
| 1360 CHECK_STRING (string); | |
| 1361 if (len < 0) | |
| 1362 len = XSTRING_LENGTH (string) - offset; | |
| 1363 assert (offset >= 0); | |
| 1364 assert (len >= 0); | |
| 1365 assert (offset + len <= XSTRING_LENGTH (string)); | |
| 1366 | |
| 1367 lstr = Lstream_new (lstream_lisp_string, "r"); | |
| 1368 str = LISP_STRING_STREAM_DATA (lstr); | |
| 1369 str->offset = offset; | |
| 1370 str->end = offset + len; | |
| 1371 str->init_offset = offset; | |
| 1372 str->obj = string; | |
| 793 | 1373 return wrap_lstream (lstr); |
| 428 | 1374 } |
| 1375 | |
| 665 | 1376 static Bytecount |
| 462 | 1377 lisp_string_reader (Lstream *stream, unsigned char *data, |
| 665 | 1378 Bytecount size) |
| 428 | 1379 { |
| 1380 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream); | |
| 1381 /* Don't lose if the string shrank past us ... */ | |
| 1382 Bytecount offset = min (str->offset, XSTRING_LENGTH (str->obj)); | |
| 867 | 1383 Ibyte *strstart = XSTRING_DATA (str->obj); |
| 1384 Ibyte *start = strstart + offset; | |
| 428 | 1385 |
| 1386 /* ... or if someone changed the string and we ended up in the | |
| 1387 middle of a character. */ | |
| 1388 /* Being in the middle of a character is `normal' unless | |
| 1389 LSTREAM_NO_PARTIAL_CHARS - mrb */ | |
| 1390 if (stream->flags & LSTREAM_FL_NO_PARTIAL_CHARS) | |
| 867 | 1391 VALIDATE_IBYTEPTR_BACKWARD (start); |
| 428 | 1392 offset = start - strstart; |
| 665 | 1393 size = min (size, (Bytecount) (str->end - offset)); |
| 428 | 1394 memcpy (data, start, size); |
| 1395 str->offset = offset + size; | |
| 1396 return size; | |
| 1397 } | |
| 1398 | |
| 1399 static int | |
| 1400 lisp_string_rewinder (Lstream *stream) | |
| 1401 { | |
| 1402 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream); | |
| 1403 int pos = str->init_offset; | |
| 1404 if (pos > str->end) | |
| 1405 pos = str->end; | |
| 1406 /* Don't lose if the string shrank past us ... */ | |
| 1407 pos = min (pos, XSTRING_LENGTH (str->obj)); | |
| 1408 /* ... or if someone changed the string and we ended up in the | |
| 1409 middle of a character. */ | |
| 1410 { | |
| 867 | 1411 Ibyte *strstart = XSTRING_DATA (str->obj); |
| 1412 Ibyte *start = strstart + pos; | |
| 1413 VALIDATE_IBYTEPTR_BACKWARD (start); | |
| 428 | 1414 pos = start - strstart; |
| 1415 } | |
| 1416 str->offset = pos; | |
| 1417 return 0; | |
| 1418 } | |
| 1419 | |
| 1420 static Lisp_Object | |
| 1421 lisp_string_marker (Lisp_Object stream) | |
| 1422 { | |
| 1423 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (XLSTREAM (stream)); | |
| 1424 return str->obj; | |
| 1425 } | |
| 1426 | |
| 1427 /*********** a fixed buffer ***********/ | |
| 1428 | |
| 1429 #define FIXED_BUFFER_STREAM_DATA(stream) \ | |
| 1430 LSTREAM_TYPE_DATA (stream, fixed_buffer) | |
| 1431 | |
| 1432 struct fixed_buffer_stream | |
| 1433 { | |
| 442 | 1434 const unsigned char *inbuf; |
| 428 | 1435 unsigned char *outbuf; |
| 665 | 1436 Bytecount size; |
| 1437 Bytecount offset; | |
| 428 | 1438 }; |
| 1439 | |
| 771 | 1440 DEFINE_LSTREAM_IMPLEMENTATION ("fixed-buffer", fixed_buffer); |
| 428 | 1441 |
| 1442 Lisp_Object | |
| 665 | 1443 make_fixed_buffer_input_stream (const void *buf, Bytecount size) |
| 428 | 1444 { |
| 1445 Lstream *lstr = Lstream_new (lstream_fixed_buffer, "r"); | |
| 1446 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (lstr); | |
| 440 | 1447 str->inbuf = (const unsigned char *) buf; |
| 428 | 1448 str->size = size; |
| 793 | 1449 return wrap_lstream (lstr); |
| 428 | 1450 } |
| 1451 | |
| 1452 Lisp_Object | |
| 665 | 1453 make_fixed_buffer_output_stream (void *buf, Bytecount size) |
| 428 | 1454 { |
| 1455 Lstream *lstr = Lstream_new (lstream_fixed_buffer, "w"); | |
| 1456 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (lstr); | |
| 440 | 1457 str->outbuf = (unsigned char *) buf; |
| 428 | 1458 str->size = size; |
| 793 | 1459 return wrap_lstream (lstr); |
| 428 | 1460 } |
| 1461 | |
| 665 | 1462 static Bytecount |
| 462 | 1463 fixed_buffer_reader (Lstream *stream, unsigned char *data, |
| 665 | 1464 Bytecount size) |
| 428 | 1465 { |
| 1466 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (stream); | |
| 1467 size = min (size, str->size - str->offset); | |
| 1468 memcpy (data, str->inbuf + str->offset, size); | |
| 1469 str->offset += size; | |
| 1470 return size; | |
| 1471 } | |
| 1472 | |
| 665 | 1473 static Bytecount |
| 462 | 1474 fixed_buffer_writer (Lstream *stream, const unsigned char *data, |
| 665 | 1475 Bytecount size) |
| 428 | 1476 { |
| 1477 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (stream); | |
| 1478 if (str->offset == str->size) | |
| 1479 { | |
| 1480 /* If we're at the end, just throw away the data and pretend | |
| 1481 we wrote all of it. If we return 0, then the lstream routines | |
| 1482 will try again and again to write it out. */ | |
| 1483 return size; | |
| 1484 } | |
| 1485 size = min (size, str->size - str->offset); | |
| 1486 memcpy (str->outbuf + str->offset, data, size); | |
| 1487 str->offset += size; | |
| 1488 return size; | |
| 1489 } | |
| 1490 | |
| 1491 static int | |
| 1492 fixed_buffer_rewinder (Lstream *stream) | |
| 1493 { | |
| 1494 FIXED_BUFFER_STREAM_DATA (stream)->offset = 0; | |
| 1495 return 0; | |
| 1496 } | |
| 1497 | |
| 442 | 1498 const unsigned char * |
| 428 | 1499 fixed_buffer_input_stream_ptr (Lstream *stream) |
| 1500 { | |
| 1501 assert (stream->imp == lstream_fixed_buffer); | |
| 1502 return FIXED_BUFFER_STREAM_DATA (stream)->inbuf; | |
| 1503 } | |
| 1504 | |
| 1505 unsigned char * | |
| 1506 fixed_buffer_output_stream_ptr (Lstream *stream) | |
| 1507 { | |
| 1508 assert (stream->imp == lstream_fixed_buffer); | |
| 1509 return FIXED_BUFFER_STREAM_DATA (stream)->outbuf; | |
| 1510 } | |
| 1511 | |
| 1512 /*********** write to a resizing buffer ***********/ | |
| 1513 | |
| 1514 #define RESIZING_BUFFER_STREAM_DATA(stream) \ | |
| 1515 LSTREAM_TYPE_DATA (stream, resizing_buffer) | |
| 1516 | |
| 1517 struct resizing_buffer_stream | |
| 1518 { | |
| 1519 unsigned char *buf; | |
| 665 | 1520 Bytecount allocked; |
| 428 | 1521 int max_stored; |
| 1522 int stored; | |
| 1523 }; | |
| 1524 | |
| 771 | 1525 DEFINE_LSTREAM_IMPLEMENTATION ("resizing-buffer", resizing_buffer); |
| 428 | 1526 |
| 1527 Lisp_Object | |
| 1528 make_resizing_buffer_output_stream (void) | |
| 1529 { | |
| 793 | 1530 return wrap_lstream (Lstream_new (lstream_resizing_buffer, "w")); |
| 428 | 1531 } |
| 1532 | |
| 665 | 1533 static Bytecount |
| 462 | 1534 resizing_buffer_writer (Lstream *stream, const unsigned char *data, |
| 665 | 1535 Bytecount size) |
| 428 | 1536 { |
| 1537 struct resizing_buffer_stream *str = RESIZING_BUFFER_STREAM_DATA (stream); | |
| 1538 DO_REALLOC (str->buf, str->allocked, str->stored + size, unsigned char); | |
| 1539 memcpy (str->buf + str->stored, data, size); | |
| 1540 str->stored += size; | |
| 1541 str->max_stored = max (str->max_stored, str->stored); | |
| 1542 return size; | |
| 1543 } | |
| 1544 | |
| 1545 static int | |
| 1546 resizing_buffer_rewinder (Lstream *stream) | |
| 1547 { | |
| 1548 RESIZING_BUFFER_STREAM_DATA (stream)->stored = 0; | |
| 1549 return 0; | |
| 1550 } | |
| 1551 | |
| 1552 static int | |
| 1553 resizing_buffer_closer (Lstream *stream) | |
| 1554 { | |
| 1555 struct resizing_buffer_stream *str = RESIZING_BUFFER_STREAM_DATA (stream); | |
| 1556 if (str->buf) | |
| 1557 { | |
|
4976
16112448d484
Rename xfree(FOO, TYPE) -> xfree(FOO)
Ben Wing <ben@xemacs.org>
parents:
3263
diff
changeset
|
1558 xfree (str->buf); |
| 428 | 1559 str->buf = 0; |
| 1560 } | |
| 1561 return 0; | |
| 1562 } | |
| 1563 | |
| 1564 unsigned char * | |
| 1565 resizing_buffer_stream_ptr (Lstream *stream) | |
| 1566 { | |
| 1567 return RESIZING_BUFFER_STREAM_DATA (stream)->buf; | |
| 1568 } | |
| 1569 | |
| 788 | 1570 Lisp_Object |
| 1571 resizing_buffer_to_lisp_string (Lstream *stream) | |
| 1572 { | |
| 1573 return make_string (resizing_buffer_stream_ptr (stream), | |
| 1574 Lstream_byte_count (stream)); | |
| 1575 } | |
| 1576 | |
| 428 | 1577 /*********** write to an unsigned-char dynarr ***********/ |
| 1578 | |
| 1579 /* Note: If you have a dynarr whose type is not unsigned_char_dynarr | |
| 1580 but which is really just an unsigned_char_dynarr (e.g. its type | |
| 867 | 1581 is Ibyte or Extbyte), just cast to unsigned_char_dynarr. */ |
| 428 | 1582 |
| 1583 #define DYNARR_STREAM_DATA(stream) \ | |
| 1584 LSTREAM_TYPE_DATA (stream, dynarr) | |
| 1585 | |
| 1586 struct dynarr_stream | |
| 1587 { | |
| 1588 unsigned_char_dynarr *dyn; | |
| 1589 }; | |
| 1590 | |
| 771 | 1591 DEFINE_LSTREAM_IMPLEMENTATION ("dynarr", dynarr); |
| 428 | 1592 |
| 1593 Lisp_Object | |
| 1594 make_dynarr_output_stream (unsigned_char_dynarr *dyn) | |
| 1595 { | |
| 793 | 1596 Lisp_Object obj = wrap_lstream (Lstream_new (lstream_dynarr, "w")); |
| 1597 | |
| 428 | 1598 DYNARR_STREAM_DATA (XLSTREAM (obj))->dyn = dyn; |
| 1599 return obj; | |
| 1600 } | |
| 1601 | |
| 665 | 1602 static Bytecount |
| 462 | 1603 dynarr_writer (Lstream *stream, const unsigned char *data, |
| 665 | 1604 Bytecount size) |
| 428 | 1605 { |
| 1606 struct dynarr_stream *str = DYNARR_STREAM_DATA (stream); | |
| 1607 Dynarr_add_many (str->dyn, data, size); | |
| 1608 return size; | |
| 1609 } | |
| 1610 | |
| 1611 static int | |
| 1612 dynarr_rewinder (Lstream *stream) | |
| 1613 { | |
| 1614 Dynarr_reset (DYNARR_STREAM_DATA (stream)->dyn); | |
| 1615 return 0; | |
| 1616 } | |
| 1617 | |
| 1618 static int | |
| 2286 | 1619 dynarr_closer (Lstream *UNUSED (stream)) |
| 428 | 1620 { |
| 1621 return 0; | |
| 1622 } | |
| 1623 | |
| 1624 /************ read from or write to a Lisp buffer ************/ | |
| 1625 | |
| 1626 /* Note: Lisp-buffer read streams never return partial characters, | |
| 1627 and Lisp-buffer write streams expect to never get partial | |
| 1628 characters. */ | |
| 1629 | |
| 1630 #define LISP_BUFFER_STREAM_DATA(stream) \ | |
| 1631 LSTREAM_TYPE_DATA (stream, lisp_buffer) | |
| 1632 | |
| 1633 struct lisp_buffer_stream | |
| 1634 { | |
| 1635 Lisp_Object buffer; | |
| 1636 Lisp_Object orig_start; | |
| 1637 /* we use markers to properly deal with insertion/deletion */ | |
| 1638 Lisp_Object start, end; | |
| 1639 int flags; | |
| 1640 }; | |
| 1641 | |
| 1204 | 1642 static const struct memory_description lisp_buffer_lstream_description[] = { |
| 1643 { XD_LISP_OBJECT, offsetof (struct lisp_buffer_stream, buffer) }, | |
| 1644 { XD_LISP_OBJECT, offsetof (struct lisp_buffer_stream, orig_start) }, | |
| 1645 { XD_LISP_OBJECT, offsetof (struct lisp_buffer_stream, start) }, | |
| 1646 { XD_LISP_OBJECT, offsetof (struct lisp_buffer_stream, end) }, | |
| 1647 { XD_END } | |
| 1648 }; | |
| 1649 | |
| 1650 DEFINE_LSTREAM_IMPLEMENTATION_WITH_DATA ("lisp-buffer", lisp_buffer); | |
| 428 | 1651 |
| 1652 static Lisp_Object | |
| 665 | 1653 make_lisp_buffer_stream_1 (struct buffer *buf, Charbpos start, Charbpos end, |
| 2367 | 1654 int flags, const Ascbyte *mode) |
| 428 | 1655 { |
| 1656 Lstream *lstr; | |
| 1657 struct lisp_buffer_stream *str; | |
| 665 | 1658 Charbpos bmin, bmax; |
| 428 | 1659 int reading = !strcmp (mode, "r"); |
| 1660 | |
| 1661 /* Make sure the luser didn't pass "w" in. */ | |
| 1662 if (!strcmp (mode, "w")) | |
| 2500 | 1663 ABORT (); |
| 428 | 1664 |
| 1665 if (flags & LSTR_IGNORE_ACCESSIBLE) | |
| 1666 { | |
| 1667 bmin = BUF_BEG (buf); | |
| 1668 bmax = BUF_Z (buf); | |
| 1669 } | |
| 1670 else | |
| 1671 { | |
| 1672 bmin = BUF_BEGV (buf); | |
| 1673 bmax = BUF_ZV (buf); | |
| 1674 } | |
| 1675 | |
| 1676 if (start == -1) | |
| 1677 start = bmin; | |
| 1678 if (end == -1) | |
| 1679 end = bmax; | |
| 1680 assert (bmin <= start); | |
| 1681 assert (start <= bmax); | |
| 1682 if (reading) | |
| 1683 { | |
| 1684 assert (bmin <= end); | |
| 1685 assert (end <= bmax); | |
| 1686 assert (start <= end); | |
| 1687 } | |
| 1688 | |
| 1689 lstr = Lstream_new (lstream_lisp_buffer, mode); | |
| 1690 str = LISP_BUFFER_STREAM_DATA (lstr); | |
| 1691 { | |
| 1692 Lisp_Object marker; | |
| 793 | 1693 Lisp_Object buffer = wrap_buffer (buf); |
| 428 | 1694 |
| 1695 marker = Fmake_marker (); | |
| 1696 Fset_marker (marker, make_int (start), buffer); | |
| 1697 str->start = marker; | |
| 1698 marker = Fmake_marker (); | |
| 1699 Fset_marker (marker, make_int (start), buffer); | |
| 1700 str->orig_start = marker; | |
| 1701 if (reading) | |
| 1702 { | |
| 1703 marker = Fmake_marker (); | |
| 1704 Fset_marker (marker, make_int (end), buffer); | |
| 1705 str->end = marker; | |
| 1706 } | |
| 1707 else | |
| 1708 str->end = Qnil; | |
| 1709 str->buffer = buffer; | |
| 1710 } | |
| 1711 str->flags = flags; | |
| 793 | 1712 return wrap_lstream (lstr); |
| 428 | 1713 } |
| 1714 | |
| 1715 Lisp_Object | |
| 826 | 1716 make_lisp_buffer_input_stream (struct buffer *buf, Charbpos start, |
| 1717 Charbpos end, int flags) | |
| 428 | 1718 { |
| 1719 return make_lisp_buffer_stream_1 (buf, start, end, flags, "r"); | |
| 1720 } | |
| 1721 | |
| 1722 Lisp_Object | |
| 665 | 1723 make_lisp_buffer_output_stream (struct buffer *buf, Charbpos pos, int flags) |
| 428 | 1724 { |
| 1725 Lisp_Object lstr = make_lisp_buffer_stream_1 (buf, pos, 0, flags, "wc"); | |
| 1726 | |
| 1727 Lstream_set_character_mode (XLSTREAM (lstr)); | |
| 1728 return lstr; | |
| 1729 } | |
| 1730 | |
| 665 | 1731 static Bytecount |
| 867 | 1732 lisp_buffer_reader (Lstream *stream, Ibyte *data, Bytecount size) |
| 428 | 1733 { |
| 1734 struct lisp_buffer_stream *str = LISP_BUFFER_STREAM_DATA (stream); | |
| 665 | 1735 Bytebpos start; |
| 1736 Bytebpos end; | |
| 428 | 1737 struct buffer *buf = XBUFFER (str->buffer); |
| 826 | 1738 Bytecount src_used; |
| 428 | 1739 |
| 1740 if (!BUFFER_LIVE_P (buf)) | |
| 1741 return 0; /* Fut. */ | |
| 1742 | |
| 826 | 1743 start = byte_marker_position (str->start); |
| 1744 end = byte_marker_position (str->end); | |
| 428 | 1745 if (!(str->flags & LSTR_IGNORE_ACCESSIBLE)) |
| 1746 { | |
| 826 | 1747 start = bytebpos_clip_to_bounds (BYTE_BUF_BEGV (buf), start, |
| 1748 BYTE_BUF_ZV (buf)); | |
| 1749 end = bytebpos_clip_to_bounds (BYTE_BUF_BEGV (buf), end, | |
| 1750 BYTE_BUF_ZV (buf)); | |
| 428 | 1751 } |
| 1752 | |
| 826 | 1753 size = copy_buffer_text_out (buf, start, end - start, data, size, |
| 1754 FORMAT_DEFAULT, Qnil, &src_used); | |
| 1755 end = start + src_used; | |
| 428 | 1756 |
| 1757 if (EQ (buf->selective_display, Qt) && str->flags & LSTR_SELECTIVE) | |
| 1758 { | |
| 1759 /* What a kludge. What a kludge. What a kludge. */ | |
| 867 | 1760 Ibyte *p; |
| 840 | 1761 for (p = data; p < data + src_used; p++) |
| 428 | 1762 if (*p == '\r') |
| 1763 *p = '\n'; | |
| 1764 } | |
| 1765 | |
| 826 | 1766 set_byte_marker_position (str->start, end); |
| 1767 return size; | |
| 428 | 1768 } |
| 1769 | |
| 665 | 1770 static Bytecount |
| 867 | 1771 lisp_buffer_writer (Lstream *stream, const Ibyte *data, |
| 665 | 1772 Bytecount size) |
| 428 | 1773 { |
| 1774 struct lisp_buffer_stream *str = LISP_BUFFER_STREAM_DATA (stream); | |
| 665 | 1775 Charbpos pos; |
| 428 | 1776 struct buffer *buf = XBUFFER (str->buffer); |
| 1777 | |
| 1778 if (!BUFFER_LIVE_P (buf)) | |
| 1779 return 0; /* Fut. */ | |
| 1780 | |
| 1781 pos = marker_position (str->start); | |
| 1782 pos += buffer_insert_raw_string_1 (buf, pos, data, size, 0); | |
| 1783 set_marker_position (str->start, pos); | |
| 1784 return size; | |
| 1785 } | |
| 1786 | |
| 1787 static int | |
| 1788 lisp_buffer_rewinder (Lstream *stream) | |
| 1789 { | |
| 1790 struct lisp_buffer_stream *str = | |
| 1791 LISP_BUFFER_STREAM_DATA (stream); | |
| 1792 struct buffer *buf = XBUFFER (str->buffer); | |
| 1793 long pos = marker_position (str->orig_start); | |
| 1794 if (!BUFFER_LIVE_P (buf)) | |
| 1795 return -1; /* Fut. */ | |
| 1796 if (pos > BUF_ZV (buf)) | |
| 1797 pos = BUF_ZV (buf); | |
| 1798 if (pos < marker_position (str->orig_start)) | |
| 1799 pos = marker_position (str->orig_start); | |
| 1800 if (MARKERP (str->end) && pos > marker_position (str->end)) | |
| 1801 pos = marker_position (str->end); | |
| 1802 set_marker_position (str->start, pos); | |
| 1803 return 0; | |
| 1804 } | |
| 1805 | |
| 1806 static Lisp_Object | |
| 1807 lisp_buffer_marker (Lisp_Object stream) | |
| 1808 { | |
| 1809 struct lisp_buffer_stream *str = | |
| 1810 LISP_BUFFER_STREAM_DATA (XLSTREAM (stream)); | |
| 1811 | |
| 1204 | 1812 mark_object (str->orig_start); |
| 428 | 1813 mark_object (str->start); |
| 1814 mark_object (str->end); | |
| 1815 return str->buffer; | |
| 1816 } | |
| 1817 | |
| 665 | 1818 Charbpos |
| 428 | 1819 lisp_buffer_stream_startpos (Lstream *stream) |
| 1820 { | |
| 1821 return marker_position (LISP_BUFFER_STREAM_DATA (stream)->start); | |
| 1822 } | |
| 1823 | |
| 1824 | |
| 1825 /************************************************************************/ | |
| 1826 /* initialization */ | |
| 1827 /************************************************************************/ | |
| 1828 | |
| 1829 void | |
| 1830 lstream_type_create (void) | |
| 1831 { | |
| 1832 LSTREAM_HAS_METHOD (stdio, reader); | |
| 1833 LSTREAM_HAS_METHOD (stdio, writer); | |
| 1834 LSTREAM_HAS_METHOD (stdio, rewinder); | |
| 1835 LSTREAM_HAS_METHOD (stdio, seekable_p); | |
| 1836 LSTREAM_HAS_METHOD (stdio, flusher); | |
| 1837 LSTREAM_HAS_METHOD (stdio, closer); | |
| 1838 | |
| 1839 LSTREAM_HAS_METHOD (filedesc, reader); | |
| 1840 LSTREAM_HAS_METHOD (filedesc, writer); | |
| 1841 LSTREAM_HAS_METHOD (filedesc, was_blocked_p); | |
| 1842 LSTREAM_HAS_METHOD (filedesc, rewinder); | |
| 1843 LSTREAM_HAS_METHOD (filedesc, seekable_p); | |
| 1844 LSTREAM_HAS_METHOD (filedesc, closer); | |
| 1845 | |
| 1846 LSTREAM_HAS_METHOD (lisp_string, reader); | |
| 1847 LSTREAM_HAS_METHOD (lisp_string, rewinder); | |
| 1848 LSTREAM_HAS_METHOD (lisp_string, marker); | |
| 1849 | |
| 1850 LSTREAM_HAS_METHOD (fixed_buffer, reader); | |
| 1851 LSTREAM_HAS_METHOD (fixed_buffer, writer); | |
| 1852 LSTREAM_HAS_METHOD (fixed_buffer, rewinder); | |
| 1853 | |
| 1854 LSTREAM_HAS_METHOD (resizing_buffer, writer); | |
| 1855 LSTREAM_HAS_METHOD (resizing_buffer, rewinder); | |
| 1856 LSTREAM_HAS_METHOD (resizing_buffer, closer); | |
| 1857 | |
| 1858 LSTREAM_HAS_METHOD (dynarr, writer); | |
| 1859 LSTREAM_HAS_METHOD (dynarr, rewinder); | |
| 1860 LSTREAM_HAS_METHOD (dynarr, closer); | |
| 1861 | |
| 1862 LSTREAM_HAS_METHOD (lisp_buffer, reader); | |
| 1863 LSTREAM_HAS_METHOD (lisp_buffer, writer); | |
| 1864 LSTREAM_HAS_METHOD (lisp_buffer, rewinder); | |
| 1865 LSTREAM_HAS_METHOD (lisp_buffer, marker); | |
| 1866 } | |
| 1867 | |
| 3263 | 1868 #ifndef NEW_GC |
| 428 | 1869 void |
| 1870 reinit_vars_of_lstream (void) | |
| 1871 { | |
| 1872 int i; | |
| 1873 | |
| 1874 for (i = 0; i < countof (Vlstream_free_list); i++) | |
| 1875 { | |
| 1876 Vlstream_free_list[i] = Qnil; | |
| 1877 staticpro_nodump (&Vlstream_free_list[i]); | |
| 1878 } | |
| 1879 } | |
| 3263 | 1880 #endif /* not NEW_GC */ |
| 428 | 1881 |
| 1882 void | |
| 1883 vars_of_lstream (void) | |
| 1884 { | |
| 442 | 1885 INIT_LRECORD_IMPLEMENTATION (lstream); |
| 428 | 1886 } |