Mercurial > hg > xemacs-beta
annotate src/lstream.c @ 5315:2a7b6ddb8063
#'float: if handed a bigfloat, give the same bigfloat back.
2010-12-29 Aidan Kehoe <kehoea@parhasard.net>
* floatfns.c (Ffloat): If we've been handed a bigfloat here, it's
appropriate to give the same bigfloat back.
| author | Aidan Kehoe <kehoea@parhasard.net> |
|---|---|
| date | Wed, 29 Dec 2010 23:51:08 +0000 |
| parents | 1fae11d56ad2 |
| children | 308d34e9f07d |
| rev | line source |
|---|---|
| 428 | 1 /* Generic stream implementation. |
| 2 Copyright (C) 1995 Free Software Foundation, Inc. | |
| 3 Copyright (C) 1995 Sun Microsystems, Inc. | |
|
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4 Copyright (C) 1996, 2001, 2002, 2010 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, |
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67 "#<INTERNAL OBJECT (XEmacs bug?) (%s lstream) 0x%x>", |
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68 lstr->imp->name, LISP_OBJECT_UID (obj)); |
| 428 | 69 } |
| 70 | |
| 71 static void | |
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72 finalize_lstream (Lisp_Object obj) |
| 428 | 73 { |
| 74 /* WARNING WARNING WARNING. This function (and all finalize functions) | |
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75 may get called more than once on the same object. */ |
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76 Lstream *lstr = XLSTREAM (obj); |
| 428 | 77 |
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78 if (lstr->flags & LSTREAM_FL_IS_OPEN) |
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79 Lstream_close (lstr); |
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80 |
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81 if (lstr->imp->finalizer) |
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82 (lstr->imp->finalizer) (lstr); |
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83 } |
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84 |
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85 static void |
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86 disksave_lstream (Lisp_Object lstream) |
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87 { |
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88 Lstream *lstr = XLSTREAM (lstream); |
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89 |
| 428 | 90 #if 0 /* this may cause weird Broken Pipes? */ |
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91 Lstream_pseudo_close (lstr); |
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92 return; |
| 428 | 93 #endif |
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94 if ((lstr->flags & LSTREAM_FL_IS_OPEN) && |
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95 (lstr->flags & LSTREAM_FL_CLOSE_AT_DISKSAVE)) |
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96 Lstream_close (lstr); |
| 428 | 97 } |
| 98 | |
| 665 | 99 inline static Bytecount |
| 100 aligned_sizeof_lstream (Bytecount lstream_type_specific_size) | |
| 456 | 101 { |
| 826 | 102 return MAX_ALIGN_SIZE (offsetof (Lstream, data) + |
| 103 lstream_type_specific_size); | |
| 456 | 104 } |
| 105 | |
| 665 | 106 static Bytecount |
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107 sizeof_lstream (Lisp_Object obj) |
| 428 | 108 { |
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109 return aligned_sizeof_lstream (XLSTREAM (obj)->imp->size); |
| 428 | 110 } |
| 111 | |
| 1204 | 112 static const struct memory_description lstream_implementation_description_1[] |
| 113 = { | |
| 114 { XD_END } | |
| 115 }; | |
| 116 | |
| 117 const struct sized_memory_description lstream_implementation_description = { | |
| 118 sizeof (struct lstream_implementation), | |
| 119 lstream_implementation_description_1 | |
| 120 }; | |
| 121 | |
| 122 static const struct sized_memory_description lstream_extra_description_map[] = | |
| 123 { | |
| 124 { offsetof (Lstream, imp) }, | |
| 125 { offsetof (struct lstream_implementation, extra_description) }, | |
| 126 { -1 }, | |
| 127 }; | |
| 128 | |
| 129 static const struct memory_description lstream_description[] = | |
| 130 { | |
| 2367 | 131 { XD_BLOCK_PTR, offsetof (Lstream, imp), 1, |
| 2551 | 132 { &lstream_implementation_description } }, |
| 2367 | 133 { XD_BLOCK_ARRAY, offsetof (Lstream, data), 1, |
| 2551 | 134 { lstream_extra_description_map } }, |
| 1204 | 135 { XD_END } |
| 136 }; | |
| 137 | |
| 138 static const struct memory_description lstream_empty_extra_description_1[] = | |
| 139 { | |
| 140 { XD_END } | |
| 141 }; | |
| 142 | |
| 143 const struct sized_memory_description lstream_empty_extra_description = { | |
| 144 0, lstream_empty_extra_description_1 | |
| 145 }; | |
| 146 | |
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147 DEFINE_NODUMP_SIZABLE_LISP_OBJECT ("stream", lstream, |
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148 mark_lstream, print_lstream, |
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149 finalize_lstream, |
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150 0, 0, /* no equal or hash */ |
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151 lstream_description, |
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152 sizeof_lstream, Lstream); |
| 428 | 153 |
| 771 | 154 |
| 155 /* Change the buffering of a stream. See lstream.h. By default the | |
| 156 buffering is STREAM_BLOCK_BUFFERED. */ | |
| 157 | |
| 428 | 158 void |
| 159 Lstream_set_buffering (Lstream *lstr, Lstream_buffering buffering, | |
| 160 int buffering_size) | |
| 161 { | |
| 162 lstr->buffering = buffering; | |
| 163 switch (buffering) | |
| 164 { | |
| 165 case LSTREAM_UNBUFFERED: | |
| 166 lstr->buffering_size = 0; break; | |
| 167 case LSTREAM_BLOCK_BUFFERED: | |
| 168 lstr->buffering_size = DEFAULT_BLOCK_BUFFERING_SIZE; break; | |
| 169 case LSTREAM_BLOCKN_BUFFERED: | |
| 170 lstr->buffering_size = buffering_size; break; | |
| 171 case LSTREAM_LINE_BUFFERED: | |
| 172 case LSTREAM_UNLIMITED: | |
| 173 lstr->buffering_size = INT_MAX; break; | |
| 174 } | |
| 175 } | |
| 176 | |
| 3263 | 177 #ifndef NEW_GC |
| 442 | 178 static const Lstream_implementation *lstream_types[32]; |
| 428 | 179 static Lisp_Object Vlstream_free_list[32]; |
| 180 static int lstream_type_count; | |
| 3263 | 181 #endif /* not NEW_GC */ |
| 428 | 182 |
| 771 | 183 /* Allocate and return a new Lstream. This function is not really |
| 184 meant to be called directly; rather, each stream type should | |
| 185 provide its own stream creation function, which creates the stream | |
| 186 and does any other necessary creation stuff (e.g. opening a | |
| 187 file). */ | |
| 188 | |
| 428 | 189 Lstream * |
| 442 | 190 Lstream_new (const Lstream_implementation *imp, const char *mode) |
| 428 | 191 { |
| 192 Lstream *p; | |
| 3263 | 193 #ifdef NEW_GC |
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194 p = XLSTREAM (ALLOC_SIZED_LISP_OBJECT (aligned_sizeof_lstream (imp->size), |
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195 lstream)); |
| 3263 | 196 #else /* not NEW_GC */ |
| 428 | 197 int i; |
| 198 | |
| 199 for (i = 0; i < lstream_type_count; i++) | |
| 200 { | |
| 201 if (lstream_types[i] == imp) | |
| 202 break; | |
| 203 } | |
| 204 | |
| 205 if (i == lstream_type_count) | |
| 206 { | |
| 207 assert (lstream_type_count < countof (lstream_types)); | |
| 208 lstream_types[lstream_type_count] = imp; | |
| 209 Vlstream_free_list[lstream_type_count] = | |
| 456 | 210 make_lcrecord_list (aligned_sizeof_lstream (imp->size), |
| 428 | 211 &lrecord_lstream); |
| 212 lstream_type_count++; | |
| 213 } | |
| 214 | |
| 1204 | 215 p = XLSTREAM (alloc_managed_lcrecord (Vlstream_free_list[i])); |
| 3263 | 216 #endif /* not NEW_GC */ |
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217 /* Formerly, we zeroed out the object minus its header, but it's now |
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218 handled automatically. ALLOC_SIZED_LISP_OBJECT() always zeroes out |
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219 the whole object other than its header, and alloc_managed_lcrecord() |
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220 does the same. */ |
| 428 | 221 p->imp = imp; |
| 222 Lstream_set_buffering (p, LSTREAM_BLOCK_BUFFERED, 0); | |
| 223 p->flags = LSTREAM_FL_IS_OPEN; | |
| 224 | |
| 225 /* convert mode (one of "r", "w", "rc", "wc") to p->flags */ | |
| 226 assert (mode[0] == 'r' || mode[0] == 'w'); | |
| 227 assert (mode[1] == 'c' || mode[1] == '\0'); | |
| 228 p->flags |= (mode[0] == 'r' ? LSTREAM_FL_READ : LSTREAM_FL_WRITE); | |
| 229 if (mode[1] == 'c') | |
| 230 p->flags |= LSTREAM_FL_NO_PARTIAL_CHARS; | |
| 231 | |
| 232 return p; | |
| 233 } | |
| 234 | |
| 771 | 235 /* Set or unset "character mode" on the stream. The basic idea is that, |
| 236 assuming valid internal-format data is passing through the stream and | |
| 237 we're processing the data character by character, we don't want partial | |
| 238 characters at the end of the data. (No partial characters at the | |
| 239 beginning happens naturally if we eliminate partial characters at the | |
| 240 end and the stream is implemented correctly.) | |
| 241 | |
| 242 Character mode actually has two somewhat different meanings, depending | |
| 243 on whether this is a read stream or write stream. If a read stream, | |
| 244 character mode means that data returned from calling Lstream_read() on | |
| 245 the stream will contain only full characters. If a write stream, | |
| 246 character mode means that data passed to the write method in the stream | |
| 247 implementation will contain only full characters. It's important to | |
| 248 note the non-parallelism in who should set this mode on the stream: The | |
| 249 *CALLER* sets character mode on read streams it creates; the *STREAM | |
| 250 ITSELF* sets character mode on write streams, typically at creation | |
| 814 | 251 time. |
| 252 | |
| 253 (However, if a read stream always generates internal-format data, then | |
| 254 the callers will almost always want character mode, and it's allowed to | |
| 255 set this on behalf of the caller, as long as a flag can be provided at | |
| 256 creation time to disable this behavior.) */ | |
| 771 | 257 |
| 428 | 258 void |
| 259 Lstream_set_character_mode (Lstream *lstr) | |
| 260 { | |
| 261 lstr->flags |= LSTREAM_FL_NO_PARTIAL_CHARS; | |
| 262 } | |
| 263 | |
| 771 | 264 /* Unset character mode. See Lstream_set_character_mode(). */ |
| 265 | |
| 266 void | |
| 267 Lstream_unset_character_mode (Lstream *lstr) | |
| 268 { | |
| 269 lstr->flags &= ~LSTREAM_FL_NO_PARTIAL_CHARS; | |
| 270 } | |
| 271 | |
| 272 /* Close the stream (if it's open), and free all memory associated with the | |
| 273 stream. Put the stream on a free list; later calls to create a new | |
| 274 stream of this type may reuse this stream. Calling this is not strictly | |
| 275 necessary, but it is much more efficient than having the Lstream be | |
| 276 garbage-collected. Be VERY VERY SURE there are no pointers to this | |
| 277 object hanging around anywhere where they might be used! When streams | |
| 278 are chained together, be VERY CAREFUL of the order in which you delete | |
| 279 them! (e.g. if the streams are in a singly-linked list, delete the head | |
| 814 | 280 first; this will close (but check the documentation, e.g. of |
| 281 make_coding_input_stream()), and may send data down to the rest. Then | |
| 771 | 282 proceed to the rest, one by one. If the chains are in a doubly-linked |
| 283 list, close all the streams first (again, from the head to the tail), | |
| 284 disconnect the back links, then delete starting from the head. In | |
| 814 | 285 general, it's a good idea to close everything before deleting anything. |
| 771 | 286 |
| 287 NOTE: DO NOT CALL DURING GARBAGE COLLECTION (e.g. in a finalizer). You | |
| 288 will be aborted. See free_managed_lcrecord(). */ | |
| 289 | |
| 428 | 290 void |
| 291 Lstream_delete (Lstream *lstr) | |
| 292 { | |
| 3263 | 293 #ifndef NEW_GC |
| 428 | 294 int i; |
| 3263 | 295 #endif /* not NEW_GC */ |
| 793 | 296 Lisp_Object val = wrap_lstream (lstr); |
| 428 | 297 |
| 3263 | 298 #ifdef NEW_GC |
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299 free_normal_lisp_object (val); |
| 3263 | 300 #else /* not NEW_GC */ |
| 428 | 301 for (i = 0; i < lstream_type_count; i++) |
| 302 { | |
| 303 if (lstream_types[i] == lstr->imp) | |
| 304 { | |
| 305 free_managed_lcrecord (Vlstream_free_list[i], val); | |
| 306 return; | |
| 307 } | |
| 308 } | |
| 309 | |
| 2500 | 310 ABORT (); |
| 3263 | 311 #endif /* not NEW_GC */ |
| 428 | 312 } |
| 313 | |
| 314 #define Lstream_internal_error(reason, lstr) \ | |
| 563 | 315 signal_error (Qinternal_error, reason, wrap_lstream (lstr)) |
| 428 | 316 |
| 771 | 317 /* Reopen a closed stream. This enables I/O on it again. This is not |
| 318 meant to be called except from a wrapper routine that reinitializes | |
| 319 variables and such -- the close routine may well have freed some | |
| 320 necessary storage structures, for example. */ | |
| 321 | |
| 428 | 322 void |
| 323 Lstream_reopen (Lstream *lstr) | |
| 324 { | |
| 325 if (lstr->flags & LSTREAM_FL_IS_OPEN) | |
| 326 Lstream_internal_error ("lstream already open", lstr); | |
| 327 lstr->flags |= LSTREAM_FL_IS_OPEN; | |
| 328 } | |
| 329 | |
| 771 | 330 /* Try to write as much of DATA as possible to the stream. Return the |
| 331 number of bytes written. */ | |
| 428 | 332 |
| 771 | 333 static int |
| 334 Lstream_really_write (Lstream *lstr, const unsigned char *data, int size) | |
| 428 | 335 { |
| 665 | 336 Bytecount num_written; |
| 771 | 337 const unsigned char *orig_data = data; |
| 338 int error_occurred = 0; | |
| 428 | 339 |
| 771 | 340 while (size > 0) |
| 428 | 341 { |
| 342 if (! (lstr->flags & LSTREAM_FL_IS_OPEN)) | |
| 343 Lstream_internal_error ("lstream not open", lstr); | |
| 344 if (! (lstr->flags & LSTREAM_FL_WRITE)) | |
| 345 Lstream_internal_error ("lstream not open for writing", lstr); | |
| 346 if (!lstr->imp->writer) | |
| 347 Lstream_internal_error ("lstream has no writer", lstr); | |
| 348 | |
| 349 if (lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS) | |
| 350 /* It's quite possible for us to get passed an incomplete | |
| 351 character at the end. We need to spit back that | |
| 352 incomplete character. */ | |
| 353 { | |
| 442 | 354 const unsigned char *dataend = data + size - 1; |
| 428 | 355 assert (size > 0); /* safety check ... */ |
| 356 /* Optimize the most common case. */ | |
| 826 | 357 if (!byte_ascii_p (*dataend)) |
| 428 | 358 { |
| 359 /* Go back to the beginning of the last (and possibly partial) | |
| 360 character, and bump forward to see if the character is | |
| 361 complete. */ | |
| 867 | 362 VALIDATE_IBYTEPTR_BACKWARD (dataend); |
| 826 | 363 if (dataend + rep_bytes_by_first_byte (*dataend) != data + size) |
| 428 | 364 /* If not, chop the size down to ignore the last char |
| 365 and stash it away for next time. */ | |
| 366 size = dataend - data; | |
| 367 /* If we don't even have one character to write, then just | |
| 368 skip out. */ | |
| 369 if (size == 0) | |
| 370 break; | |
| 371 } | |
| 372 } | |
| 373 | |
| 771 | 374 num_written = (lstr->imp->writer) (lstr, data, size); |
| 428 | 375 if (num_written == 0) |
| 376 /* If nothing got written, then just hold the data. This may | |
| 377 occur, for example, if this stream does non-blocking I/O; | |
| 378 the attempt to write the data might have resulted in an | |
| 379 EWOULDBLOCK error. */ | |
| 771 | 380 break; |
| 381 else if (num_written > size) | |
| 2500 | 382 ABORT (); |
| 428 | 383 else if (num_written > 0) |
| 384 { | |
| 771 | 385 data += num_written; |
| 386 size -= num_written; | |
| 428 | 387 } |
| 388 else | |
| 771 | 389 { |
| 390 /* If error, just hold the data, for similar reasons as above. */ | |
| 391 error_occurred = 1; | |
| 392 break; | |
| 393 } | |
| 428 | 394 } |
| 395 | |
| 2383 | 396 if (!error_occurred && lstr->imp->flusher) |
| 771 | 397 error_occurred = (lstr->imp->flusher) (lstr) < 0; |
| 398 | |
| 399 if (data == orig_data && error_occurred) | |
| 400 return -1; | |
| 401 | |
| 402 return data - orig_data; | |
| 403 } | |
| 404 | |
| 405 /* Attempt to flush out all of the buffered data for writing. Leaves | |
| 406 whatever wasn't flushed sitting in the stream's buffers. Return -1 if | |
| 407 nothing written and error occurred, 0 otherwise. */ | |
| 428 | 408 |
| 771 | 409 int |
| 410 Lstream_flush_out (Lstream *lstr) | |
| 411 { | |
| 412 Bytecount num_written = | |
| 413 Lstream_really_write (lstr, lstr->out_buffer, lstr->out_buffer_ind); | |
| 414 if (num_written == lstr->out_buffer_ind) | |
| 415 { | |
| 416 lstr->out_buffer_ind = 0; | |
| 417 return 0; | |
| 418 } | |
| 419 else if (num_written > 0) | |
| 420 { | |
| 421 memmove (lstr->out_buffer, lstr->out_buffer + num_written, | |
| 422 lstr->out_buffer_ind - num_written); | |
| 423 lstr->out_buffer_ind -= num_written; | |
| 424 return 0; | |
| 425 } | |
| 426 else return num_written; | |
| 428 | 427 } |
| 428 | |
| 771 | 429 /* Flush out any pending unwritten data in the stream. Clear any buffered |
| 430 input data. This differs from Lstream_flush_out() in that it also | |
| 431 clears any unflushable buffered data. Returns 0 on success, -1 on | |
| 432 error. */ | |
| 433 | |
| 428 | 434 int |
| 435 Lstream_flush (Lstream *lstr) | |
| 436 { | |
| 437 if (Lstream_flush_out (lstr) < 0) | |
| 438 return -1; | |
| 439 | |
| 440 /* clear out buffered data */ | |
| 441 lstr->in_buffer_current = lstr->in_buffer_ind = 0; | |
| 442 lstr->unget_buffer_ind = 0; | |
| 443 | |
| 444 return 0; | |
| 445 } | |
| 446 | |
| 447 /* We want to add NUM characters. This function ensures that the | |
| 448 buffer is large enough for this (per the buffering size specified | |
| 449 in the stream) and returns the number of characters we can | |
| 450 actually write. If FORCE is set, ignore the buffering size | |
| 451 and go ahead and make space for all the chars even if it exceeds | |
| 452 the buffering size. (This is used to deal with the possibility | |
| 453 that the stream writer might refuse to write any bytes now, e.g. | |
| 454 if it's getting EWOULDBLOCK errors. We have to keep stocking them | |
| 771 | 455 up until they can be written, so as to avoid losing data.) */ |
| 428 | 456 |
| 665 | 457 static Bytecount |
| 458 Lstream_adding (Lstream *lstr, Bytecount num, int force) | |
| 428 | 459 { |
| 665 | 460 Bytecount size = num + lstr->out_buffer_ind; |
| 430 | 461 |
| 462 if (size <= lstr->out_buffer_size) | |
| 463 return num; | |
| 464 | |
| 428 | 465 /* Maybe chop it down so that we don't buffer more characters |
| 466 than our advertised buffering size. */ | |
| 430 | 467 if ((size > lstr->buffering_size) && !force) |
| 468 { | |
| 469 size = lstr->buffering_size; | |
| 470 /* There might be more data buffered than the buffering size. */ | |
| 471 if (size <= lstr->out_buffer_ind) | |
| 472 return 0; | |
| 473 } | |
| 474 | |
| 475 DO_REALLOC (lstr->out_buffer, lstr->out_buffer_size, size, unsigned char); | |
| 476 | |
| 477 return size - lstr->out_buffer_ind; | |
| 428 | 478 } |
| 479 | |
| 480 /* Like Lstream_write(), but does not handle line-buffering correctly. */ | |
| 481 | |
| 771 | 482 static int |
| 665 | 483 Lstream_write_1 (Lstream *lstr, const void *data, Bytecount size) |
| 428 | 484 { |
| 442 | 485 const unsigned char *p = (const unsigned char *) data; |
| 665 | 486 Bytecount off = 0; |
| 428 | 487 if (! (lstr->flags & LSTREAM_FL_IS_OPEN)) |
| 488 Lstream_internal_error ("lstream not open", lstr); | |
| 489 if (! (lstr->flags & LSTREAM_FL_WRITE)) | |
| 490 Lstream_internal_error ("lstream not open for writing", lstr); | |
| 771 | 491 |
| 492 if (lstr->buffering == LSTREAM_UNBUFFERED) | |
| 493 { | |
| 494 /* If there is buffered data, it means we ran into blocking | |
| 495 errors the previous time and had to buffer our remaining | |
| 496 data. Try to write it now. */ | |
| 497 if (lstr->out_buffer_ind > 0) | |
| 498 { | |
| 499 if (Lstream_flush_out (lstr) < 0) | |
| 500 return -1; | |
| 501 } | |
| 502 | |
| 503 /* If not still blocked, try to write the new data */ | |
| 504 if (lstr->out_buffer_ind == 0) | |
| 505 { | |
| 506 /* we don't need to loop because Lstream_really_write does that | |
| 507 for us. */ | |
| 508 Bytecount num_written = Lstream_really_write (lstr, p, size); | |
| 509 if (num_written < 0) | |
| 510 return -1; | |
| 511 off += num_written; | |
| 512 } | |
| 513 | |
| 514 /* squirrel away the rest of the data */ | |
| 515 if (off < size) | |
| 516 { | |
| 517 Lstream_adding (lstr, size - off, 1); | |
| 518 memcpy (lstr->out_buffer + lstr->out_buffer_ind, p + off, | |
| 519 size - off); | |
| 520 lstr->out_buffer_ind += size - off; | |
| 521 } | |
| 522 | |
| 523 lstr->byte_count += size; | |
| 524 return 0; | |
| 525 } | |
| 526 else | |
| 527 { | |
| 528 int couldnt_write_last_time = 0; | |
| 428 | 529 |
| 771 | 530 while (1) |
| 531 { | |
| 532 /* Figure out how much we can add to the buffer */ | |
| 533 Bytecount chunk = Lstream_adding (lstr, size, 0); | |
| 534 if (chunk == 0) | |
| 535 { | |
| 536 if (couldnt_write_last_time) | |
| 537 /* Ung, we ran out of space and tried to flush | |
| 538 the buffer, but it didn't work because the stream | |
| 539 writer is refusing to accept any data. So we | |
| 540 just have to squirrel away all the rest of the | |
| 541 stuff. */ | |
| 542 chunk = Lstream_adding (lstr, size, 1); | |
| 543 else | |
| 544 couldnt_write_last_time = 1; | |
| 545 } | |
| 546 /* Do it. */ | |
| 547 if (chunk > 0) | |
| 548 { | |
| 549 memcpy (lstr->out_buffer + lstr->out_buffer_ind, p + off, chunk); | |
| 550 lstr->out_buffer_ind += chunk; | |
| 551 lstr->byte_count += chunk; | |
| 552 size -= chunk; | |
| 553 off += chunk; | |
| 554 } | |
| 555 /* If the buffer is full and we have more to add, flush it out. */ | |
| 556 if (size > 0) | |
| 557 { | |
| 558 if (Lstream_flush_out (lstr) < 0) | |
| 559 { | |
| 560 if (off == 0) | |
| 561 return -1; | |
| 562 else | |
| 563 return 0; | |
| 564 } | |
| 565 } | |
| 566 else | |
| 567 break; | |
| 568 } | |
| 569 } | |
| 570 return 0; | |
| 428 | 571 } |
| 572 | |
| 771 | 573 /* Write SIZE bytes of DATA to the stream. Return value is 0 on success, |
| 574 -1 on error. -1 is only returned when no bytes could be written; if any | |
| 575 bytes could be written, then 0 is returned and any unwritten bytes are | |
| 576 buffered and the next call to Lstream_write() will try to write them | |
| 577 again. (This buffering happens even when the stream's buffering type is | |
| 578 LSTREAM_UNBUFFERED, and regardless of how much data is passed in or what | |
| 579 the stream's buffering size was set to. #### There should perhaps be a | |
| 580 way to control whether this happens.) */ | |
| 428 | 581 |
| 771 | 582 int |
| 665 | 583 Lstream_write (Lstream *lstr, const void *data, Bytecount size) |
| 428 | 584 { |
| 665 | 585 Bytecount i; |
| 442 | 586 const unsigned char *p = (const unsigned char *) data; |
| 428 | 587 |
| 771 | 588 /* If the stream is not line-buffered, then we can just call |
| 589 Lstream_write_1(), which writes in chunks. Otherwise, we repeatedly | |
| 590 call Lstream_putc(), which knows how to handle line buffering. | |
| 591 Returns 0 on success, -1 on failure. */ | |
| 592 | |
| 428 | 593 if (size == 0) |
| 771 | 594 return 0; |
| 428 | 595 if (lstr->buffering != LSTREAM_LINE_BUFFERED) |
| 596 return Lstream_write_1 (lstr, data, size); | |
| 597 for (i = 0; i < size; i++) | |
| 598 { | |
| 599 if (Lstream_putc (lstr, p[i]) < 0) | |
| 600 break; | |
| 601 } | |
| 771 | 602 return i == 0 ? -1 : 0; |
| 428 | 603 } |
| 604 | |
| 605 int | |
| 606 Lstream_was_blocked_p (Lstream *lstr) | |
| 607 { | |
| 608 return lstr->imp->was_blocked_p ? lstr->imp->was_blocked_p (lstr) : 0; | |
| 609 } | |
| 610 | |
| 665 | 611 static Bytecount |
| 462 | 612 Lstream_raw_read (Lstream *lstr, unsigned char *buffer, |
| 665 | 613 Bytecount size) |
| 428 | 614 { |
| 615 if (! (lstr->flags & LSTREAM_FL_IS_OPEN)) | |
| 616 Lstream_internal_error ("lstream not open", lstr); | |
| 617 if (! (lstr->flags & LSTREAM_FL_READ)) | |
| 618 Lstream_internal_error ("lstream not open for reading", lstr); | |
| 619 if (!lstr->imp->reader) | |
| 620 Lstream_internal_error ("lstream has no reader", lstr); | |
| 621 | |
| 622 return (lstr->imp->reader) (lstr, buffer, size); | |
| 623 } | |
| 624 | |
| 625 /* Assuming the buffer is empty, fill it up again. */ | |
| 626 | |
| 665 | 627 static Bytecount |
| 428 | 628 Lstream_read_more (Lstream *lstr) |
| 629 { | |
| 630 #if 0 | |
| 665 | 631 Bytecount size_needed |
| 462 | 632 = max (1, min (MAX_READ_SIZE, lstr->buffering_size)); |
| 428 | 633 #else |
| 634 /* If someone requested a larger buffer size, so be it! */ | |
| 665 | 635 Bytecount size_needed = |
| 462 | 636 max (1, lstr->buffering_size); |
| 428 | 637 #endif |
| 665 | 638 Bytecount size_gotten; |
| 428 | 639 |
| 640 DO_REALLOC (lstr->in_buffer, lstr->in_buffer_size, | |
| 641 size_needed, unsigned char); | |
| 642 size_gotten = Lstream_raw_read (lstr, lstr->in_buffer, size_needed); | |
| 643 lstr->in_buffer_current = max (0, size_gotten); | |
| 644 lstr->in_buffer_ind = 0; | |
| 645 return size_gotten < 0 ? -1 : size_gotten; | |
| 646 } | |
| 647 | |
| 771 | 648 /* Read SIZE bytes of DATA from the stream. Return the number of bytes |
| 649 read. 0 means EOF (#### sometimes; it may simply indicate we can't read | |
| 650 any data at other times, particularly if SIZE is too small. this needs | |
| 651 to be fixed!). -1 means an error occurred and no bytes were read. */ | |
| 652 | |
| 814 | 653 static Bytecount |
| 654 Lstream_read_1 (Lstream *lstr, void *data, Bytecount size, | |
| 655 int override_no_partial_chars) | |
| 428 | 656 { |
| 657 unsigned char *p = (unsigned char *) data; | |
| 665 | 658 Bytecount off = 0; |
| 659 Bytecount chunk; | |
| 428 | 660 int error_occurred = 0; |
| 661 | |
| 662 if (size == 0) | |
| 663 return 0; | |
| 664 | |
| 665 /* First try to get some data from the unget buffer */ | |
| 666 chunk = min (size, lstr->unget_buffer_ind); | |
| 667 if (chunk > 0) | |
| 668 { | |
| 669 /* The bytes come back in reverse order. */ | |
| 670 for (; off < chunk; off++) | |
| 671 p[off] = lstr->unget_buffer[--lstr->unget_buffer_ind]; | |
| 672 lstr->byte_count += chunk; | |
| 673 size -= chunk; | |
| 674 } | |
| 675 | |
| 676 while (size > 0) | |
| 677 { | |
| 771 | 678 /* If unbuffered, then simply read directly into output buffer. |
| 679 No need to copy. */ | |
| 680 if (lstr->buffering == LSTREAM_UNBUFFERED) | |
| 681 { | |
| 682 chunk = Lstream_raw_read (lstr, p + off, size); | |
| 683 if (chunk < 0) | |
| 684 error_occurred = 1; | |
| 685 if (chunk <= 0) | |
| 686 break; | |
| 687 lstr->byte_count += chunk; | |
| 428 | 688 size -= chunk; |
| 771 | 689 off += chunk; |
| 690 } | |
| 691 else | |
| 428 | 692 { |
| 771 | 693 /* Take whatever we can from the in buffer */ |
| 694 chunk = min (size, lstr->in_buffer_current - lstr->in_buffer_ind); | |
| 695 if (chunk > 0) | |
| 696 { | |
| 697 memcpy (p + off, lstr->in_buffer + lstr->in_buffer_ind, chunk); | |
| 698 lstr->in_buffer_ind += chunk; | |
| 699 lstr->byte_count += chunk; | |
| 700 size -= chunk; | |
| 701 off += chunk; | |
| 702 } | |
| 703 | |
| 704 /* If we need some more, try to get some more from the | |
| 705 stream's end */ | |
| 706 if (size > 0) | |
| 707 { | |
| 708 Bytecount retval = Lstream_read_more (lstr); | |
| 709 if (retval < 0) | |
| 710 error_occurred = 1; | |
| 711 if (retval <= 0) | |
| 712 break; | |
| 713 } | |
| 428 | 714 } |
| 715 } | |
| 716 | |
| 814 | 717 if ((lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS) && |
| 718 !override_no_partial_chars) | |
| 428 | 719 { |
| 720 /* It's quite possible for us to get passed an incomplete | |
| 721 character at the end. We need to spit back that | |
| 722 incomplete character. */ | |
| 867 | 723 Bytecount newoff = validate_ibyte_string_backward (p, off); |
| 771 | 724 if (newoff < off) |
| 428 | 725 { |
| 771 | 726 Lstream_unread (lstr, p + newoff, off - newoff); |
| 727 off = newoff; | |
| 428 | 728 } |
| 729 } | |
| 730 | |
| 462 | 731 return off == 0 && error_occurred ? -1 : off; |
| 428 | 732 } |
| 733 | |
| 814 | 734 Bytecount |
| 735 Lstream_read (Lstream *lstr, void *data, Bytecount size) | |
| 736 { | |
| 737 return Lstream_read_1 (lstr, data, size, 0); | |
| 738 } | |
| 739 | |
| 740 | |
| 771 | 741 /* Push back SIZE bytes of DATA onto the input queue. The next call |
| 742 to Lstream_read() with the same size will read the same bytes back. | |
| 743 Note that this will be the case even if there is other pending | |
| 744 unread data. */ | |
| 745 | |
| 428 | 746 void |
| 665 | 747 Lstream_unread (Lstream *lstr, const void *data, Bytecount size) |
| 428 | 748 { |
| 442 | 749 const unsigned char *p = (const unsigned char *) data; |
| 428 | 750 |
| 751 /* Make sure buffer is big enough */ | |
| 752 DO_REALLOC (lstr->unget_buffer, lstr->unget_buffer_size, | |
| 753 lstr->unget_buffer_ind + size, unsigned char); | |
| 754 | |
| 755 lstr->byte_count -= size; | |
| 756 | |
| 757 /* Bytes have to go on in reverse order -- they are reversed | |
| 758 again when read back. */ | |
| 759 while (size--) | |
| 760 lstr->unget_buffer[lstr->unget_buffer_ind++] = p[size]; | |
| 761 } | |
| 762 | |
| 771 | 763 /* Rewind the stream to the beginning. */ |
| 764 | |
| 428 | 765 int |
| 766 Lstream_rewind (Lstream *lstr) | |
| 767 { | |
| 768 if (!lstr->imp->rewinder) | |
| 769 Lstream_internal_error ("lstream has no rewinder", lstr); | |
| 770 if (Lstream_flush (lstr) < 0) | |
| 771 return -1; | |
| 772 lstr->byte_count = 0; | |
| 773 return (lstr->imp->rewinder) (lstr); | |
| 774 } | |
| 775 | |
| 776 int | |
| 777 Lstream_seekable_p (Lstream *lstr) | |
| 778 { | |
| 779 if (!lstr->imp->rewinder) | |
| 780 return 0; | |
| 781 if (!lstr->imp->seekable_p) | |
| 782 return 1; | |
| 783 return (lstr->imp->seekable_p) (lstr); | |
| 784 } | |
| 785 | |
| 786 static int | |
| 787 Lstream_pseudo_close (Lstream *lstr) | |
| 788 { | |
| 1943 | 789 if (! (lstr->flags & LSTREAM_FL_IS_OPEN)) |
| 428 | 790 Lstream_internal_error ("lstream is not open", lstr); |
| 791 | |
| 792 /* don't check errors here -- best not to risk file descriptor loss */ | |
| 793 return Lstream_flush (lstr); | |
| 794 } | |
| 795 | |
| 771 | 796 /* Close the stream. All data will be flushed out. If the stream is |
| 797 already closed, nothing happens. Note that, even if all data has | |
| 798 already been flushed out, the act of closing a stream may generate more | |
| 799 data -- for example, if the stream implements some sort of conversion, | |
| 800 such as gzip, there may be special "end-data" that need to be written | |
| 801 out when the file is closed. */ | |
| 802 | |
| 428 | 803 int |
| 804 Lstream_close (Lstream *lstr) | |
| 805 { | |
| 806 int rc = 0; | |
| 807 | |
| 808 if (lstr->flags & LSTREAM_FL_IS_OPEN) | |
| 809 { | |
| 810 rc = Lstream_pseudo_close (lstr); | |
| 811 /* | |
| 812 * We used to return immediately if the closer method reported | |
| 813 * failure, leaving the stream open. But this is no good, for | |
| 814 * the following reasons. | |
| 815 * | |
| 816 * 1. The finalizer method used in GC makes no provision for | |
| 817 * failure, so we must not return without freeing buffer | |
| 818 * memory. | |
| 819 * | |
| 820 * 2. The closer method may have already freed some memory | |
| 821 * used for I/O in this stream. E.g. encoding_closer frees | |
| 822 * ENCODING_STREAM_DATA(stream)->runoff. If a writer method | |
| 823 * tries to use this buffer later, it will write into memory | |
| 824 * that may have been allocated elsewhere. Sometime later | |
| 825 * you will see a sign that says "Welcome to Crash City." | |
| 826 * | |
| 827 * 3. The closer can report failure if a flush fails in the | |
| 828 * other stream in a MULE encoding/decoding stream pair. | |
| 829 * The other stream in the pair is closed, but returning | |
| 830 * early leaves the current stream open. If we try to | |
| 831 * flush the current stream later, we will crash when the | |
| 832 * flusher notices that the other end stream is closed. | |
| 833 * | |
| 834 * So, we no longer abort the close if the closer method | |
| 835 * reports some kind of failure. We still report the failure | |
| 836 * to the caller. | |
| 837 */ | |
| 838 if (lstr->imp->closer) | |
| 839 if ((lstr->imp->closer) (lstr) < 0) | |
| 840 rc = -1; | |
| 841 } | |
| 842 | |
| 843 lstr->flags &= ~LSTREAM_FL_IS_OPEN; | |
| 844 lstr->byte_count = 0; | |
| 845 /* Note that Lstream_flush() reset all the buffer indices. That way, | |
| 846 the next call to Lstream_putc(), Lstream_getc(), or Lstream_ungetc() | |
| 847 on a closed stream will call into the function equivalents, which will | |
| 848 cause an error. */ | |
| 849 | |
| 850 /* We set the pointers to 0 so that we don't lose when this function | |
| 851 is called more than once on the same object */ | |
| 852 if (lstr->out_buffer) | |
| 853 { | |
|
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parents:
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diff
changeset
|
854 xfree (lstr->out_buffer); |
| 428 | 855 lstr->out_buffer = 0; |
| 856 } | |
| 857 if (lstr->in_buffer) | |
| 858 { | |
|
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parents:
3263
diff
changeset
|
859 xfree (lstr->in_buffer); |
| 428 | 860 lstr->in_buffer = 0; |
| 861 } | |
| 862 if (lstr->unget_buffer) | |
| 863 { | |
|
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Ben Wing <ben@xemacs.org>
parents:
3263
diff
changeset
|
864 xfree (lstr->unget_buffer); |
| 428 | 865 lstr->unget_buffer = 0; |
| 866 } | |
| 867 | |
| 868 return rc; | |
| 869 } | |
| 870 | |
| 771 | 871 |
| 872 /* Function equivalent of Lstream_putc(). */ | |
| 873 | |
| 428 | 874 int |
| 875 Lstream_fputc (Lstream *lstr, int c) | |
| 876 { | |
| 877 unsigned char ch = (unsigned char) c; | |
| 771 | 878 int retval = Lstream_write_1 (lstr, &ch, 1); |
| 879 if (retval == 0 && lstr->buffering == LSTREAM_LINE_BUFFERED && ch == '\n') | |
| 428 | 880 return Lstream_flush_out (lstr); |
| 771 | 881 return retval; |
| 428 | 882 } |
| 883 | |
| 771 | 884 /* Function equivalent of Lstream_getc(). */ |
| 885 | |
| 428 | 886 int |
| 887 Lstream_fgetc (Lstream *lstr) | |
| 888 { | |
| 889 unsigned char ch; | |
| 814 | 890 if (Lstream_read_1 (lstr, &ch, 1, 1) <= 0) |
| 428 | 891 return -1; |
| 892 return ch; | |
| 893 } | |
| 894 | |
| 771 | 895 /* Function equivalent of Lstream_ungetc(). */ |
| 896 | |
| 428 | 897 void |
| 898 Lstream_fungetc (Lstream *lstr, int c) | |
| 899 { | |
| 900 unsigned char ch = (unsigned char) c; | |
| 901 Lstream_unread (lstr, &ch, 1); | |
| 902 } | |
| 903 | |
| 904 | |
| 905 /************************ some stream implementations *********************/ | |
| 906 | |
| 907 /*********** a stdio stream ***********/ | |
| 908 | |
| 909 struct stdio_stream | |
| 910 { | |
| 911 FILE *file; | |
| 912 int closing; | |
| 913 }; | |
| 914 | |
| 915 #define STDIO_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, stdio) | |
| 916 | |
| 771 | 917 DEFINE_LSTREAM_IMPLEMENTATION ("stdio", stdio); |
| 428 | 918 |
| 919 static Lisp_Object | |
| 442 | 920 make_stdio_stream_1 (FILE *stream, int flags, const char *mode) |
| 428 | 921 { |
| 922 Lstream *lstr = Lstream_new (lstream_stdio, mode); | |
| 923 struct stdio_stream *str = STDIO_STREAM_DATA (lstr); | |
| 924 str->file = stream; | |
| 925 str->closing = flags & LSTR_CLOSING; | |
| 926 lstr->flags |= LSTREAM_FL_CLOSE_AT_DISKSAVE; | |
| 793 | 927 return wrap_lstream (lstr); |
| 428 | 928 } |
| 929 | |
| 930 Lisp_Object | |
| 931 make_stdio_input_stream (FILE *stream, int flags) | |
| 932 { | |
| 933 return make_stdio_stream_1 (stream, flags, "r"); | |
| 934 } | |
| 935 | |
| 936 Lisp_Object | |
| 937 make_stdio_output_stream (FILE *stream, int flags) | |
| 938 { | |
| 939 return make_stdio_stream_1 (stream, flags, "w"); | |
| 940 } | |
| 941 | |
| 942 /* #### From reading the Unix 98 specification, it appears that if we | |
| 943 want stdio_reader() to be completely correct, we should check for | |
| 944 0 < val < size and if so, check to see if an error has occurred. | |
| 945 If an error has occurred, but val is non-zero, we should go ahead | |
| 946 and act as if the read was successful, but remember in some fashion | |
| 947 or other, that an error has occurred, and report that on the next | |
| 771 | 948 call to stdio_reader instead of calling retry_fread() again. |
| 428 | 949 |
| 771 | 950 Currently, in such a case, we end up calling retry_fread() twice and we |
| 428 | 951 assume that |
| 952 | |
| 953 1) this is not harmful, and | |
| 954 2) the error will still be reported on the second read. | |
| 955 | |
| 956 This is probably reasonable, so I don't think we should change this | |
| 957 code (it could even be argued that the error might have fixed | |
| 771 | 958 itself, so we should do the retry_fread() again. */ |
| 428 | 959 |
| 665 | 960 static Bytecount |
| 961 stdio_reader (Lstream *stream, unsigned char *data, Bytecount size) | |
| 428 | 962 { |
| 963 struct stdio_stream *str = STDIO_STREAM_DATA (stream); | |
| 771 | 964 Bytecount val = retry_fread (data, 1, size, str->file); |
| 965 if (!val) | |
| 966 { | |
| 967 if (ferror (str->file)) | |
| 968 return LSTREAM_ERROR; | |
| 969 if (feof (str->file)) | |
| 970 return 0; /* LSTREAM_EOF; */ | |
| 971 } | |
| 428 | 972 return val; |
| 973 } | |
| 974 | |
| 665 | 975 static Bytecount |
| 462 | 976 stdio_writer (Lstream *stream, const unsigned char *data, |
| 665 | 977 Bytecount size) |
| 428 | 978 { |
| 979 struct stdio_stream *str = STDIO_STREAM_DATA (stream); | |
| 771 | 980 Bytecount val = retry_fwrite (data, 1, size, str->file); |
| 428 | 981 if (!val && ferror (str->file)) |
| 771 | 982 return LSTREAM_ERROR; |
| 428 | 983 return val; |
| 984 } | |
| 985 | |
| 986 static int | |
| 987 stdio_rewinder (Lstream *stream) | |
| 988 { | |
| 989 rewind (STDIO_STREAM_DATA (stream)->file); | |
| 990 return 0; | |
| 991 } | |
| 992 | |
| 993 static int | |
| 994 stdio_seekable_p (Lstream *stream) | |
| 995 { | |
| 996 struct stat lestat; | |
| 997 struct stdio_stream *str = STDIO_STREAM_DATA (stream); | |
| 998 | |
| 771 | 999 if (qxe_fstat (fileno (str->file), &lestat) < 0) |
| 428 | 1000 return 0; |
| 1001 return S_ISREG (lestat.st_mode); | |
| 1002 } | |
| 1003 | |
| 1004 static int | |
| 1005 stdio_flusher (Lstream *stream) | |
| 1006 { | |
| 1007 struct stdio_stream *str = STDIO_STREAM_DATA (stream); | |
| 1008 if (stream->flags & LSTREAM_FL_WRITE) | |
| 1009 return fflush (str->file); | |
| 1010 else | |
| 1011 return 0; | |
| 1012 } | |
| 1013 | |
| 1014 static int | |
| 1015 stdio_closer (Lstream *stream) | |
| 1016 { | |
| 1017 struct stdio_stream *str = STDIO_STREAM_DATA (stream); | |
| 1018 if (str->closing) | |
| 771 | 1019 return retry_fclose (str->file); |
| 428 | 1020 else |
| 1021 if (stream->flags & LSTREAM_FL_WRITE) | |
| 1022 return fflush (str->file); | |
| 1023 else | |
| 1024 return 0; | |
| 1025 } | |
| 1026 | |
| 1027 /*********** a file descriptor ***********/ | |
| 1028 | |
| 1029 struct filedesc_stream | |
| 1030 { | |
| 1031 int fd; | |
| 1032 int pty_max_bytes; | |
| 867 | 1033 Ibyte eof_char; |
| 428 | 1034 int starting_pos; |
| 1035 int current_pos; | |
| 1036 int end_pos; | |
| 1037 int chars_sans_newline; | |
| 1038 unsigned int closing :1; | |
| 1039 unsigned int allow_quit :1; | |
| 1040 unsigned int blocked_ok :1; | |
| 1041 unsigned int pty_flushing :1; | |
| 1042 unsigned int blocking_error_p :1; | |
| 1043 }; | |
| 1044 | |
| 1045 #define FILEDESC_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, filedesc) | |
| 1046 | |
| 771 | 1047 DEFINE_LSTREAM_IMPLEMENTATION ("filedesc", filedesc); |
| 428 | 1048 |
| 1049 /* Make a stream that reads from or writes to a file descriptor FILEDESC. | |
| 1050 OFFSET is the offset from the *current* file pointer that the reading | |
| 1051 should start at. COUNT is the number of bytes to be read (it is | |
| 1052 ignored when writing); -1 for unlimited. */ | |
| 1053 static Lisp_Object | |
| 1054 make_filedesc_stream_1 (int filedesc, int offset, int count, int flags, | |
| 442 | 1055 const char *mode) |
| 428 | 1056 { |
| 1057 Lstream *lstr = Lstream_new (lstream_filedesc, mode); | |
| 1058 struct filedesc_stream *fstr = FILEDESC_STREAM_DATA (lstr); | |
| 1059 fstr->fd = filedesc; | |
| 1060 fstr->closing = !!(flags & LSTR_CLOSING); | |
| 1061 fstr->allow_quit = !!(flags & LSTR_ALLOW_QUIT); | |
| 1062 fstr->blocked_ok = !!(flags & LSTR_BLOCKED_OK); | |
| 1063 fstr->pty_flushing = !!(flags & LSTR_PTY_FLUSHING); | |
| 1064 fstr->blocking_error_p = 0; | |
| 1065 fstr->chars_sans_newline = 0; | |
| 1066 fstr->starting_pos = lseek (filedesc, offset, SEEK_CUR); | |
| 1067 fstr->current_pos = max (fstr->starting_pos, 0); | |
| 1068 if (count < 0) | |
| 1069 fstr->end_pos = -1; | |
| 1070 else | |
| 1071 fstr->end_pos = fstr->starting_pos + count; | |
| 1072 lstr->flags |= LSTREAM_FL_CLOSE_AT_DISKSAVE; | |
| 793 | 1073 return wrap_lstream (lstr); |
| 428 | 1074 } |
| 1075 | |
| 814 | 1076 /* Flags: |
| 1077 | |
| 1078 LSTR_CLOSING | |
| 1079 If set, close the descriptor or FILE * when the stream is closed. | |
| 1080 | |
| 1081 LSTR_ALLOW_QUIT | |
| 1082 If set, allow quitting out of the actual I/O. | |
| 1083 | |
| 1084 LSTR_PTY_FLUSHING | |
| 1085 If set and filedesc_stream_set_pty_flushing() has been called | |
| 1086 on the stream, do not send more than pty_max_bytes on a single | |
| 1087 line without flushing the data out using the eof_char. | |
| 1088 | |
| 1089 LSTR_BLOCKED_OK | |
| 1090 If set, an EWOULDBLOCK error is not treated as an error but | |
| 1091 simply causes the write function to return 0 as the number | |
| 1092 of bytes written out. | |
| 1093 */ | |
| 1094 | |
| 428 | 1095 Lisp_Object |
| 1096 make_filedesc_input_stream (int filedesc, int offset, int count, int flags) | |
| 1097 { | |
| 1098 return make_filedesc_stream_1 (filedesc, offset, count, flags, "r"); | |
| 1099 } | |
| 1100 | |
| 1101 Lisp_Object | |
| 1102 make_filedesc_output_stream (int filedesc, int offset, int count, int flags) | |
| 1103 { | |
| 1104 return make_filedesc_stream_1 (filedesc, offset, count, flags, "w"); | |
| 1105 } | |
| 1106 | |
| 665 | 1107 static Bytecount |
| 1108 filedesc_reader (Lstream *stream, unsigned char *data, Bytecount size) | |
| 428 | 1109 { |
| 665 | 1110 Bytecount nread; |
| 428 | 1111 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); |
| 1112 if (str->end_pos >= 0) | |
| 665 | 1113 size = min (size, (Bytecount) (str->end_pos - str->current_pos)); |
| 430 | 1114 nread = str->allow_quit ? |
| 1115 read_allowing_quit (str->fd, data, size) : | |
| 771 | 1116 retry_read (str->fd, data, size); |
| 428 | 1117 if (nread > 0) |
| 1118 str->current_pos += nread; | |
| 771 | 1119 if (nread == 0) |
| 1120 return 0; /* LSTREAM_EOF; */ | |
| 1121 if (nread < 0) | |
| 1122 return LSTREAM_ERROR; | |
| 428 | 1123 return nread; |
| 1124 } | |
| 1125 | |
| 1126 static int | |
| 1127 errno_would_block_p (int val) | |
| 1128 { | |
| 1129 #ifdef EWOULDBLOCK | |
| 1130 if (val == EWOULDBLOCK) | |
| 1131 return 1; | |
| 1132 #endif | |
| 1133 #ifdef EAGAIN | |
| 1134 if (val == EAGAIN) | |
| 1135 return 1; | |
| 1136 #endif | |
| 1137 return 0; | |
| 1138 } | |
| 1139 | |
| 665 | 1140 static Bytecount |
| 462 | 1141 filedesc_writer (Lstream *stream, const unsigned char *data, |
| 665 | 1142 Bytecount size) |
| 428 | 1143 { |
| 1144 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 665 | 1145 Bytecount retval; |
| 428 | 1146 int need_newline = 0; |
| 1147 | |
| 1148 /* This function would be simple if it were not for the blasted | |
| 1149 PTY max-bytes stuff. Why the hell can't they just have written | |
| 1150 the PTY drivers right so this problem doesn't exist? | |
| 1151 | |
| 1152 Maybe all the PTY crap here should be moved into another stream | |
| 1153 that does nothing but periodically insert EOF's as necessary. */ | |
| 1154 if (str->pty_flushing) | |
| 1155 { | |
| 1156 /* To make life easy, only send out one line at the most. */ | |
| 442 | 1157 const unsigned char *ptr; |
| 428 | 1158 |
| 442 | 1159 ptr = (const unsigned char *) memchr (data, '\n', size); |
| 428 | 1160 if (ptr) |
| 1161 need_newline = 1; | |
| 1162 else | |
| 1163 ptr = data + size; | |
| 1164 if (ptr - data >= str->pty_max_bytes - str->chars_sans_newline) | |
| 1165 { | |
| 1166 ptr = data + str->pty_max_bytes - str->chars_sans_newline; | |
| 1167 need_newline = 0; | |
| 1168 } | |
| 1169 size = ptr - data; | |
| 1170 } | |
| 1171 | |
| 1172 /**** start of non-PTY-crap ****/ | |
| 1173 if (size > 0) | |
| 430 | 1174 retval = str->allow_quit ? |
| 1175 write_allowing_quit (str->fd, data, size) : | |
| 771 | 1176 retry_write (str->fd, data, size); |
| 428 | 1177 else |
| 1178 retval = 0; | |
| 1179 if (retval < 0 && errno_would_block_p (errno) && str->blocked_ok) | |
| 1180 { | |
| 1181 str->blocking_error_p = 1; | |
| 1182 return 0; | |
| 1183 } | |
| 1184 str->blocking_error_p = 0; | |
| 1185 if (retval < 0) | |
| 771 | 1186 return LSTREAM_ERROR; |
| 428 | 1187 /**** end non-PTY-crap ****/ |
| 1188 | |
| 1189 if (str->pty_flushing) | |
| 1190 { | |
| 1191 str->chars_sans_newline += retval; | |
| 1192 /* Note that a newline was not among the bytes written out. | |
| 1193 Add to the number of non-newline bytes written out, | |
| 1194 and flush with an EOF if necessary. Be careful to | |
| 1195 keep track of write errors as we go along and look | |
| 1196 out for EWOULDBLOCK. */ | |
| 1197 if (str->chars_sans_newline >= str->pty_max_bytes) | |
| 1198 { | |
| 665 | 1199 Bytecount retval2 = str->allow_quit ? |
| 430 | 1200 write_allowing_quit (str->fd, &str->eof_char, 1) : |
| 771 | 1201 retry_write (str->fd, &str->eof_char, 1); |
| 430 | 1202 |
| 428 | 1203 if (retval2 > 0) |
| 1204 str->chars_sans_newline = 0; | |
| 1205 else if (retval2 < 0) | |
| 1206 { | |
| 1207 /* Error writing the EOF char. If nothing got written, | |
| 1208 then treat this as an error -- either return an error | |
| 1209 condition or set the blocking-error flag. */ | |
| 1210 if (retval == 0) | |
| 1211 { | |
| 1212 if (errno_would_block_p (errno) && str->blocked_ok) | |
| 1213 { | |
| 1214 str->blocking_error_p = 1; | |
| 1215 return 0; | |
| 1216 } | |
| 1217 else | |
| 771 | 1218 return LSTREAM_ERROR; |
| 428 | 1219 } |
| 1220 else | |
| 1221 return retval; | |
| 1222 } | |
| 1223 } | |
| 1224 } | |
| 1225 | |
| 1226 /* The need_newline flag is necessary because otherwise when the | |
| 1227 first byte is a newline, we'd get stuck never writing anything | |
| 1228 in pty-flushing mode. */ | |
| 1229 if (need_newline) | |
| 1230 { | |
| 867 | 1231 Ibyte nl = '\n'; |
| 665 | 1232 Bytecount retval2 = str->allow_quit ? |
| 430 | 1233 write_allowing_quit (str->fd, &nl, 1) : |
| 771 | 1234 retry_write (str->fd, &nl, 1); |
| 430 | 1235 |
| 428 | 1236 if (retval2 > 0) |
| 1237 { | |
| 1238 str->chars_sans_newline = 0; | |
| 1239 retval++; | |
| 1240 } | |
| 1241 else if (retval2 < 0) | |
| 1242 { | |
| 1243 /* Error writing the newline char. If nothing got written, | |
| 1244 then treat this as an error -- either return an error | |
| 1245 condition or set the blocking-error flag. */ | |
| 1246 if (retval == 0) | |
| 1247 { | |
| 1248 if (errno_would_block_p (errno) && str->blocked_ok) | |
| 1249 { | |
| 1250 str->blocking_error_p = 1; | |
| 1251 return 0; | |
| 1252 } | |
| 1253 else | |
| 771 | 1254 return LSTREAM_ERROR; |
| 428 | 1255 } |
| 1256 else | |
| 1257 return retval; | |
| 1258 } | |
| 1259 } | |
| 1260 | |
| 1261 return retval; | |
| 1262 } | |
| 1263 | |
| 1264 static int | |
| 1265 filedesc_rewinder (Lstream *stream) | |
| 1266 { | |
| 1267 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1268 if (str->starting_pos < 0 || | |
| 1269 lseek (FILEDESC_STREAM_DATA (stream)->fd, str->starting_pos, | |
| 1270 SEEK_SET) == -1) | |
| 1271 return -1; | |
| 1272 else | |
| 1273 { | |
| 1274 str->current_pos = str->starting_pos; | |
| 1275 return 0; | |
| 1276 } | |
| 1277 } | |
| 1278 | |
| 1279 static int | |
| 1280 filedesc_seekable_p (Lstream *stream) | |
| 1281 { | |
| 1282 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1283 if (str->starting_pos < 0) | |
| 1284 return 0; | |
| 1285 else | |
| 1286 { | |
| 1287 struct stat lestat; | |
| 1288 | |
| 771 | 1289 if (qxe_fstat (str->fd, &lestat) < 0) |
| 428 | 1290 return 0; |
| 1291 return S_ISREG (lestat.st_mode); | |
| 1292 } | |
| 1293 } | |
| 1294 | |
| 1295 static int | |
| 1296 filedesc_closer (Lstream *stream) | |
| 1297 { | |
| 1298 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1299 if (str->closing) | |
| 771 | 1300 return retry_close (str->fd); |
| 428 | 1301 else |
| 1302 return 0; | |
| 1303 } | |
| 1304 | |
| 1305 static int | |
| 1306 filedesc_was_blocked_p (Lstream *stream) | |
| 1307 { | |
| 1308 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1309 return str->blocking_error_p; | |
| 1310 } | |
| 1311 | |
| 1312 void | |
| 1313 filedesc_stream_set_pty_flushing (Lstream *stream, int pty_max_bytes, | |
| 867 | 1314 Ibyte eof_char) |
| 428 | 1315 { |
| 1316 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1317 str->pty_max_bytes = pty_max_bytes; | |
| 1318 str->eof_char = eof_char; | |
| 1319 str->pty_flushing = 1; | |
| 1320 } | |
| 1321 | |
| 1322 int | |
| 1323 filedesc_stream_fd (Lstream *stream) | |
| 1324 { | |
| 1325 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1326 return str->fd; | |
| 1327 } | |
| 1328 | |
| 1329 /*********** read from a Lisp string ***********/ | |
| 1330 | |
| 1331 #define LISP_STRING_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, lisp_string) | |
| 1332 | |
| 1333 struct lisp_string_stream | |
| 1334 { | |
| 1335 Lisp_Object obj; | |
| 1336 Bytecount init_offset; | |
| 1337 Bytecount offset, end; | |
| 1338 }; | |
| 1339 | |
| 1204 | 1340 static const struct memory_description lisp_string_lstream_description[] = { |
| 1341 { XD_LISP_OBJECT, offsetof (struct lisp_string_stream, obj) }, | |
| 1342 { XD_END } | |
| 1343 }; | |
| 1344 | |
| 1345 DEFINE_LSTREAM_IMPLEMENTATION_WITH_DATA ("lisp-string", lisp_string); | |
| 428 | 1346 |
| 1347 Lisp_Object | |
| 1348 make_lisp_string_input_stream (Lisp_Object string, Bytecount offset, | |
| 1349 Bytecount len) | |
| 1350 { | |
| 1351 Lstream *lstr; | |
| 1352 struct lisp_string_stream *str; | |
| 1353 | |
| 1354 CHECK_STRING (string); | |
| 1355 if (len < 0) | |
| 1356 len = XSTRING_LENGTH (string) - offset; | |
| 1357 assert (offset >= 0); | |
| 1358 assert (len >= 0); | |
| 1359 assert (offset + len <= XSTRING_LENGTH (string)); | |
| 1360 | |
| 1361 lstr = Lstream_new (lstream_lisp_string, "r"); | |
| 1362 str = LISP_STRING_STREAM_DATA (lstr); | |
| 1363 str->offset = offset; | |
| 1364 str->end = offset + len; | |
| 1365 str->init_offset = offset; | |
| 1366 str->obj = string; | |
| 793 | 1367 return wrap_lstream (lstr); |
| 428 | 1368 } |
| 1369 | |
| 665 | 1370 static Bytecount |
| 462 | 1371 lisp_string_reader (Lstream *stream, unsigned char *data, |
| 665 | 1372 Bytecount size) |
| 428 | 1373 { |
| 1374 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream); | |
| 1375 /* Don't lose if the string shrank past us ... */ | |
| 1376 Bytecount offset = min (str->offset, XSTRING_LENGTH (str->obj)); | |
| 867 | 1377 Ibyte *strstart = XSTRING_DATA (str->obj); |
| 1378 Ibyte *start = strstart + offset; | |
| 428 | 1379 |
| 1380 /* ... or if someone changed the string and we ended up in the | |
| 1381 middle of a character. */ | |
| 1382 /* Being in the middle of a character is `normal' unless | |
| 1383 LSTREAM_NO_PARTIAL_CHARS - mrb */ | |
| 1384 if (stream->flags & LSTREAM_FL_NO_PARTIAL_CHARS) | |
| 867 | 1385 VALIDATE_IBYTEPTR_BACKWARD (start); |
| 428 | 1386 offset = start - strstart; |
| 665 | 1387 size = min (size, (Bytecount) (str->end - offset)); |
| 428 | 1388 memcpy (data, start, size); |
| 1389 str->offset = offset + size; | |
| 1390 return size; | |
| 1391 } | |
| 1392 | |
| 1393 static int | |
| 1394 lisp_string_rewinder (Lstream *stream) | |
| 1395 { | |
| 1396 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream); | |
| 1397 int pos = str->init_offset; | |
| 1398 if (pos > str->end) | |
| 1399 pos = str->end; | |
| 1400 /* Don't lose if the string shrank past us ... */ | |
| 1401 pos = min (pos, XSTRING_LENGTH (str->obj)); | |
| 1402 /* ... or if someone changed the string and we ended up in the | |
| 1403 middle of a character. */ | |
| 1404 { | |
| 867 | 1405 Ibyte *strstart = XSTRING_DATA (str->obj); |
| 1406 Ibyte *start = strstart + pos; | |
| 1407 VALIDATE_IBYTEPTR_BACKWARD (start); | |
| 428 | 1408 pos = start - strstart; |
| 1409 } | |
| 1410 str->offset = pos; | |
| 1411 return 0; | |
| 1412 } | |
| 1413 | |
| 1414 static Lisp_Object | |
| 1415 lisp_string_marker (Lisp_Object stream) | |
| 1416 { | |
| 1417 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (XLSTREAM (stream)); | |
| 1418 return str->obj; | |
| 1419 } | |
| 1420 | |
| 1421 /*********** a fixed buffer ***********/ | |
| 1422 | |
| 1423 #define FIXED_BUFFER_STREAM_DATA(stream) \ | |
| 1424 LSTREAM_TYPE_DATA (stream, fixed_buffer) | |
| 1425 | |
| 1426 struct fixed_buffer_stream | |
| 1427 { | |
| 442 | 1428 const unsigned char *inbuf; |
| 428 | 1429 unsigned char *outbuf; |
| 665 | 1430 Bytecount size; |
| 1431 Bytecount offset; | |
| 428 | 1432 }; |
| 1433 | |
| 771 | 1434 DEFINE_LSTREAM_IMPLEMENTATION ("fixed-buffer", fixed_buffer); |
| 428 | 1435 |
| 1436 Lisp_Object | |
| 665 | 1437 make_fixed_buffer_input_stream (const void *buf, Bytecount size) |
| 428 | 1438 { |
| 1439 Lstream *lstr = Lstream_new (lstream_fixed_buffer, "r"); | |
| 1440 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (lstr); | |
| 440 | 1441 str->inbuf = (const unsigned char *) buf; |
| 428 | 1442 str->size = size; |
| 793 | 1443 return wrap_lstream (lstr); |
| 428 | 1444 } |
| 1445 | |
| 1446 Lisp_Object | |
| 665 | 1447 make_fixed_buffer_output_stream (void *buf, Bytecount size) |
| 428 | 1448 { |
| 1449 Lstream *lstr = Lstream_new (lstream_fixed_buffer, "w"); | |
| 1450 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (lstr); | |
| 440 | 1451 str->outbuf = (unsigned char *) buf; |
| 428 | 1452 str->size = size; |
| 793 | 1453 return wrap_lstream (lstr); |
| 428 | 1454 } |
| 1455 | |
| 665 | 1456 static Bytecount |
| 462 | 1457 fixed_buffer_reader (Lstream *stream, unsigned char *data, |
| 665 | 1458 Bytecount size) |
| 428 | 1459 { |
| 1460 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (stream); | |
| 1461 size = min (size, str->size - str->offset); | |
| 1462 memcpy (data, str->inbuf + str->offset, size); | |
| 1463 str->offset += size; | |
| 1464 return size; | |
| 1465 } | |
| 1466 | |
| 665 | 1467 static Bytecount |
| 462 | 1468 fixed_buffer_writer (Lstream *stream, const unsigned char *data, |
| 665 | 1469 Bytecount size) |
| 428 | 1470 { |
| 1471 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (stream); | |
| 1472 if (str->offset == str->size) | |
| 1473 { | |
| 1474 /* If we're at the end, just throw away the data and pretend | |
| 1475 we wrote all of it. If we return 0, then the lstream routines | |
| 1476 will try again and again to write it out. */ | |
| 1477 return size; | |
| 1478 } | |
| 1479 size = min (size, str->size - str->offset); | |
| 1480 memcpy (str->outbuf + str->offset, data, size); | |
| 1481 str->offset += size; | |
| 1482 return size; | |
| 1483 } | |
| 1484 | |
| 1485 static int | |
| 1486 fixed_buffer_rewinder (Lstream *stream) | |
| 1487 { | |
| 1488 FIXED_BUFFER_STREAM_DATA (stream)->offset = 0; | |
| 1489 return 0; | |
| 1490 } | |
| 1491 | |
| 442 | 1492 const unsigned char * |
| 428 | 1493 fixed_buffer_input_stream_ptr (Lstream *stream) |
| 1494 { | |
| 1495 assert (stream->imp == lstream_fixed_buffer); | |
| 1496 return FIXED_BUFFER_STREAM_DATA (stream)->inbuf; | |
| 1497 } | |
| 1498 | |
| 1499 unsigned char * | |
| 1500 fixed_buffer_output_stream_ptr (Lstream *stream) | |
| 1501 { | |
| 1502 assert (stream->imp == lstream_fixed_buffer); | |
| 1503 return FIXED_BUFFER_STREAM_DATA (stream)->outbuf; | |
| 1504 } | |
| 1505 | |
| 1506 /*********** write to a resizing buffer ***********/ | |
| 1507 | |
| 1508 #define RESIZING_BUFFER_STREAM_DATA(stream) \ | |
| 1509 LSTREAM_TYPE_DATA (stream, resizing_buffer) | |
| 1510 | |
| 1511 struct resizing_buffer_stream | |
| 1512 { | |
| 1513 unsigned char *buf; | |
| 665 | 1514 Bytecount allocked; |
| 428 | 1515 int max_stored; |
| 1516 int stored; | |
| 1517 }; | |
| 1518 | |
| 771 | 1519 DEFINE_LSTREAM_IMPLEMENTATION ("resizing-buffer", resizing_buffer); |
| 428 | 1520 |
| 1521 Lisp_Object | |
| 1522 make_resizing_buffer_output_stream (void) | |
| 1523 { | |
| 793 | 1524 return wrap_lstream (Lstream_new (lstream_resizing_buffer, "w")); |
| 428 | 1525 } |
| 1526 | |
| 665 | 1527 static Bytecount |
| 462 | 1528 resizing_buffer_writer (Lstream *stream, const unsigned char *data, |
| 665 | 1529 Bytecount size) |
| 428 | 1530 { |
| 1531 struct resizing_buffer_stream *str = RESIZING_BUFFER_STREAM_DATA (stream); | |
| 1532 DO_REALLOC (str->buf, str->allocked, str->stored + size, unsigned char); | |
| 1533 memcpy (str->buf + str->stored, data, size); | |
| 1534 str->stored += size; | |
| 1535 str->max_stored = max (str->max_stored, str->stored); | |
| 1536 return size; | |
| 1537 } | |
| 1538 | |
| 1539 static int | |
| 1540 resizing_buffer_rewinder (Lstream *stream) | |
| 1541 { | |
| 1542 RESIZING_BUFFER_STREAM_DATA (stream)->stored = 0; | |
| 1543 return 0; | |
| 1544 } | |
| 1545 | |
| 1546 static int | |
| 1547 resizing_buffer_closer (Lstream *stream) | |
| 1548 { | |
| 1549 struct resizing_buffer_stream *str = RESIZING_BUFFER_STREAM_DATA (stream); | |
| 1550 if (str->buf) | |
| 1551 { | |
|
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1552 xfree (str->buf); |
| 428 | 1553 str->buf = 0; |
| 1554 } | |
| 1555 return 0; | |
| 1556 } | |
| 1557 | |
| 1558 unsigned char * | |
| 1559 resizing_buffer_stream_ptr (Lstream *stream) | |
| 1560 { | |
| 1561 return RESIZING_BUFFER_STREAM_DATA (stream)->buf; | |
| 1562 } | |
| 1563 | |
| 788 | 1564 Lisp_Object |
| 1565 resizing_buffer_to_lisp_string (Lstream *stream) | |
| 1566 { | |
| 1567 return make_string (resizing_buffer_stream_ptr (stream), | |
| 1568 Lstream_byte_count (stream)); | |
| 1569 } | |
| 1570 | |
| 428 | 1571 /*********** write to an unsigned-char dynarr ***********/ |
| 1572 | |
| 1573 /* Note: If you have a dynarr whose type is not unsigned_char_dynarr | |
| 1574 but which is really just an unsigned_char_dynarr (e.g. its type | |
| 867 | 1575 is Ibyte or Extbyte), just cast to unsigned_char_dynarr. */ |
| 428 | 1576 |
| 1577 #define DYNARR_STREAM_DATA(stream) \ | |
| 1578 LSTREAM_TYPE_DATA (stream, dynarr) | |
| 1579 | |
| 1580 struct dynarr_stream | |
| 1581 { | |
| 1582 unsigned_char_dynarr *dyn; | |
| 1583 }; | |
| 1584 | |
| 771 | 1585 DEFINE_LSTREAM_IMPLEMENTATION ("dynarr", dynarr); |
| 428 | 1586 |
| 1587 Lisp_Object | |
| 1588 make_dynarr_output_stream (unsigned_char_dynarr *dyn) | |
| 1589 { | |
| 793 | 1590 Lisp_Object obj = wrap_lstream (Lstream_new (lstream_dynarr, "w")); |
| 1591 | |
| 428 | 1592 DYNARR_STREAM_DATA (XLSTREAM (obj))->dyn = dyn; |
| 1593 return obj; | |
| 1594 } | |
| 1595 | |
| 665 | 1596 static Bytecount |
| 462 | 1597 dynarr_writer (Lstream *stream, const unsigned char *data, |
| 665 | 1598 Bytecount size) |
| 428 | 1599 { |
| 1600 struct dynarr_stream *str = DYNARR_STREAM_DATA (stream); | |
| 1601 Dynarr_add_many (str->dyn, data, size); | |
| 1602 return size; | |
| 1603 } | |
| 1604 | |
| 1605 static int | |
| 1606 dynarr_rewinder (Lstream *stream) | |
| 1607 { | |
| 1608 Dynarr_reset (DYNARR_STREAM_DATA (stream)->dyn); | |
| 1609 return 0; | |
| 1610 } | |
| 1611 | |
| 1612 static int | |
| 2286 | 1613 dynarr_closer (Lstream *UNUSED (stream)) |
| 428 | 1614 { |
| 1615 return 0; | |
| 1616 } | |
| 1617 | |
| 1618 /************ read from or write to a Lisp buffer ************/ | |
| 1619 | |
| 1620 /* Note: Lisp-buffer read streams never return partial characters, | |
| 1621 and Lisp-buffer write streams expect to never get partial | |
| 1622 characters. */ | |
| 1623 | |
| 1624 #define LISP_BUFFER_STREAM_DATA(stream) \ | |
| 1625 LSTREAM_TYPE_DATA (stream, lisp_buffer) | |
| 1626 | |
| 1627 struct lisp_buffer_stream | |
| 1628 { | |
| 1629 Lisp_Object buffer; | |
| 1630 Lisp_Object orig_start; | |
| 1631 /* we use markers to properly deal with insertion/deletion */ | |
| 1632 Lisp_Object start, end; | |
| 1633 int flags; | |
| 1634 }; | |
| 1635 | |
| 1204 | 1636 static const struct memory_description lisp_buffer_lstream_description[] = { |
| 1637 { XD_LISP_OBJECT, offsetof (struct lisp_buffer_stream, buffer) }, | |
| 1638 { XD_LISP_OBJECT, offsetof (struct lisp_buffer_stream, orig_start) }, | |
| 1639 { XD_LISP_OBJECT, offsetof (struct lisp_buffer_stream, start) }, | |
| 1640 { XD_LISP_OBJECT, offsetof (struct lisp_buffer_stream, end) }, | |
| 1641 { XD_END } | |
| 1642 }; | |
| 1643 | |
| 1644 DEFINE_LSTREAM_IMPLEMENTATION_WITH_DATA ("lisp-buffer", lisp_buffer); | |
| 428 | 1645 |
| 1646 static Lisp_Object | |
| 665 | 1647 make_lisp_buffer_stream_1 (struct buffer *buf, Charbpos start, Charbpos end, |
| 2367 | 1648 int flags, const Ascbyte *mode) |
| 428 | 1649 { |
| 1650 Lstream *lstr; | |
| 1651 struct lisp_buffer_stream *str; | |
| 665 | 1652 Charbpos bmin, bmax; |
| 428 | 1653 int reading = !strcmp (mode, "r"); |
| 1654 | |
| 1655 /* Make sure the luser didn't pass "w" in. */ | |
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1656 assert (strcmp (mode, "w")); |
| 428 | 1657 |
| 1658 if (flags & LSTR_IGNORE_ACCESSIBLE) | |
| 1659 { | |
| 1660 bmin = BUF_BEG (buf); | |
| 1661 bmax = BUF_Z (buf); | |
| 1662 } | |
| 1663 else | |
| 1664 { | |
| 1665 bmin = BUF_BEGV (buf); | |
| 1666 bmax = BUF_ZV (buf); | |
| 1667 } | |
| 1668 | |
| 1669 if (start == -1) | |
| 1670 start = bmin; | |
| 1671 if (end == -1) | |
| 1672 end = bmax; | |
| 1673 assert (bmin <= start); | |
| 1674 assert (start <= bmax); | |
| 1675 if (reading) | |
| 1676 { | |
| 1677 assert (bmin <= end); | |
| 1678 assert (end <= bmax); | |
| 1679 assert (start <= end); | |
| 1680 } | |
| 1681 | |
| 1682 lstr = Lstream_new (lstream_lisp_buffer, mode); | |
| 1683 str = LISP_BUFFER_STREAM_DATA (lstr); | |
| 1684 { | |
| 1685 Lisp_Object marker; | |
| 793 | 1686 Lisp_Object buffer = wrap_buffer (buf); |
| 428 | 1687 |
| 1688 marker = Fmake_marker (); | |
| 1689 Fset_marker (marker, make_int (start), buffer); | |
| 1690 str->start = marker; | |
| 1691 marker = Fmake_marker (); | |
| 1692 Fset_marker (marker, make_int (start), buffer); | |
| 1693 str->orig_start = marker; | |
| 1694 if (reading) | |
| 1695 { | |
| 1696 marker = Fmake_marker (); | |
| 1697 Fset_marker (marker, make_int (end), buffer); | |
| 1698 str->end = marker; | |
| 1699 } | |
| 1700 else | |
| 1701 str->end = Qnil; | |
| 1702 str->buffer = buffer; | |
| 1703 } | |
| 1704 str->flags = flags; | |
| 793 | 1705 return wrap_lstream (lstr); |
| 428 | 1706 } |
| 1707 | |
| 1708 Lisp_Object | |
| 826 | 1709 make_lisp_buffer_input_stream (struct buffer *buf, Charbpos start, |
| 1710 Charbpos end, int flags) | |
| 428 | 1711 { |
| 1712 return make_lisp_buffer_stream_1 (buf, start, end, flags, "r"); | |
| 1713 } | |
| 1714 | |
| 1715 Lisp_Object | |
| 665 | 1716 make_lisp_buffer_output_stream (struct buffer *buf, Charbpos pos, int flags) |
| 428 | 1717 { |
| 1718 Lisp_Object lstr = make_lisp_buffer_stream_1 (buf, pos, 0, flags, "wc"); | |
| 1719 | |
| 1720 Lstream_set_character_mode (XLSTREAM (lstr)); | |
| 1721 return lstr; | |
| 1722 } | |
| 1723 | |
| 665 | 1724 static Bytecount |
| 867 | 1725 lisp_buffer_reader (Lstream *stream, Ibyte *data, Bytecount size) |
| 428 | 1726 { |
| 1727 struct lisp_buffer_stream *str = LISP_BUFFER_STREAM_DATA (stream); | |
| 665 | 1728 Bytebpos start; |
| 1729 Bytebpos end; | |
| 428 | 1730 struct buffer *buf = XBUFFER (str->buffer); |
| 826 | 1731 Bytecount src_used; |
| 428 | 1732 |
| 1733 if (!BUFFER_LIVE_P (buf)) | |
| 1734 return 0; /* Fut. */ | |
| 1735 | |
| 826 | 1736 start = byte_marker_position (str->start); |
| 1737 end = byte_marker_position (str->end); | |
| 428 | 1738 if (!(str->flags & LSTR_IGNORE_ACCESSIBLE)) |
| 1739 { | |
| 826 | 1740 start = bytebpos_clip_to_bounds (BYTE_BUF_BEGV (buf), start, |
| 1741 BYTE_BUF_ZV (buf)); | |
| 1742 end = bytebpos_clip_to_bounds (BYTE_BUF_BEGV (buf), end, | |
| 1743 BYTE_BUF_ZV (buf)); | |
| 428 | 1744 } |
| 1745 | |
| 826 | 1746 size = copy_buffer_text_out (buf, start, end - start, data, size, |
| 1747 FORMAT_DEFAULT, Qnil, &src_used); | |
| 1748 end = start + src_used; | |
| 428 | 1749 |
| 1750 if (EQ (buf->selective_display, Qt) && str->flags & LSTR_SELECTIVE) | |
| 1751 { | |
| 1752 /* What a kludge. What a kludge. What a kludge. */ | |
| 867 | 1753 Ibyte *p; |
| 840 | 1754 for (p = data; p < data + src_used; p++) |
| 428 | 1755 if (*p == '\r') |
| 1756 *p = '\n'; | |
| 1757 } | |
| 1758 | |
| 826 | 1759 set_byte_marker_position (str->start, end); |
| 1760 return size; | |
| 428 | 1761 } |
| 1762 | |
| 665 | 1763 static Bytecount |
| 867 | 1764 lisp_buffer_writer (Lstream *stream, const Ibyte *data, |
| 665 | 1765 Bytecount size) |
| 428 | 1766 { |
| 1767 struct lisp_buffer_stream *str = LISP_BUFFER_STREAM_DATA (stream); | |
| 665 | 1768 Charbpos pos; |
| 428 | 1769 struct buffer *buf = XBUFFER (str->buffer); |
| 1770 | |
| 1771 if (!BUFFER_LIVE_P (buf)) | |
| 1772 return 0; /* Fut. */ | |
| 1773 | |
| 1774 pos = marker_position (str->start); | |
| 1775 pos += buffer_insert_raw_string_1 (buf, pos, data, size, 0); | |
| 1776 set_marker_position (str->start, pos); | |
| 1777 return size; | |
| 1778 } | |
| 1779 | |
| 1780 static int | |
| 1781 lisp_buffer_rewinder (Lstream *stream) | |
| 1782 { | |
| 1783 struct lisp_buffer_stream *str = | |
| 1784 LISP_BUFFER_STREAM_DATA (stream); | |
| 1785 struct buffer *buf = XBUFFER (str->buffer); | |
| 1786 long pos = marker_position (str->orig_start); | |
| 1787 if (!BUFFER_LIVE_P (buf)) | |
| 1788 return -1; /* Fut. */ | |
| 1789 if (pos > BUF_ZV (buf)) | |
| 1790 pos = BUF_ZV (buf); | |
| 1791 if (pos < marker_position (str->orig_start)) | |
| 1792 pos = marker_position (str->orig_start); | |
| 1793 if (MARKERP (str->end) && pos > marker_position (str->end)) | |
| 1794 pos = marker_position (str->end); | |
| 1795 set_marker_position (str->start, pos); | |
| 1796 return 0; | |
| 1797 } | |
| 1798 | |
| 1799 static Lisp_Object | |
| 1800 lisp_buffer_marker (Lisp_Object stream) | |
| 1801 { | |
| 1802 struct lisp_buffer_stream *str = | |
| 1803 LISP_BUFFER_STREAM_DATA (XLSTREAM (stream)); | |
| 1804 | |
| 1204 | 1805 mark_object (str->orig_start); |
| 428 | 1806 mark_object (str->start); |
| 1807 mark_object (str->end); | |
| 1808 return str->buffer; | |
| 1809 } | |
| 1810 | |
| 665 | 1811 Charbpos |
| 428 | 1812 lisp_buffer_stream_startpos (Lstream *stream) |
| 1813 { | |
| 1814 return marker_position (LISP_BUFFER_STREAM_DATA (stream)->start); | |
| 1815 } | |
| 1816 | |
| 1817 | |
| 1818 /************************************************************************/ | |
| 1819 /* initialization */ | |
| 1820 /************************************************************************/ | |
| 1821 | |
| 1822 void | |
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1823 syms_of_lstream (void) |
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1824 { |
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1825 INIT_LISP_OBJECT (lstream); |
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1826 } |
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1827 |
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1828 void |
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1829 lstream_objects_create (void) |
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1830 { |
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1831 OBJECT_HAS_PREMETHOD (lstream, disksave); |
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1832 } |
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1833 |
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1834 void |
| 428 | 1835 lstream_type_create (void) |
| 1836 { | |
| 1837 LSTREAM_HAS_METHOD (stdio, reader); | |
| 1838 LSTREAM_HAS_METHOD (stdio, writer); | |
| 1839 LSTREAM_HAS_METHOD (stdio, rewinder); | |
| 1840 LSTREAM_HAS_METHOD (stdio, seekable_p); | |
| 1841 LSTREAM_HAS_METHOD (stdio, flusher); | |
| 1842 LSTREAM_HAS_METHOD (stdio, closer); | |
| 1843 | |
| 1844 LSTREAM_HAS_METHOD (filedesc, reader); | |
| 1845 LSTREAM_HAS_METHOD (filedesc, writer); | |
| 1846 LSTREAM_HAS_METHOD (filedesc, was_blocked_p); | |
| 1847 LSTREAM_HAS_METHOD (filedesc, rewinder); | |
| 1848 LSTREAM_HAS_METHOD (filedesc, seekable_p); | |
| 1849 LSTREAM_HAS_METHOD (filedesc, closer); | |
| 1850 | |
| 1851 LSTREAM_HAS_METHOD (lisp_string, reader); | |
| 1852 LSTREAM_HAS_METHOD (lisp_string, rewinder); | |
| 1853 LSTREAM_HAS_METHOD (lisp_string, marker); | |
| 1854 | |
| 1855 LSTREAM_HAS_METHOD (fixed_buffer, reader); | |
| 1856 LSTREAM_HAS_METHOD (fixed_buffer, writer); | |
| 1857 LSTREAM_HAS_METHOD (fixed_buffer, rewinder); | |
| 1858 | |
| 1859 LSTREAM_HAS_METHOD (resizing_buffer, writer); | |
| 1860 LSTREAM_HAS_METHOD (resizing_buffer, rewinder); | |
| 1861 LSTREAM_HAS_METHOD (resizing_buffer, closer); | |
| 1862 | |
| 1863 LSTREAM_HAS_METHOD (dynarr, writer); | |
| 1864 LSTREAM_HAS_METHOD (dynarr, rewinder); | |
| 1865 LSTREAM_HAS_METHOD (dynarr, closer); | |
| 1866 | |
| 1867 LSTREAM_HAS_METHOD (lisp_buffer, reader); | |
| 1868 LSTREAM_HAS_METHOD (lisp_buffer, writer); | |
| 1869 LSTREAM_HAS_METHOD (lisp_buffer, rewinder); | |
| 1870 LSTREAM_HAS_METHOD (lisp_buffer, marker); | |
| 1871 } | |
| 1872 | |
| 3263 | 1873 #ifndef NEW_GC |
| 428 | 1874 void |
| 1875 reinit_vars_of_lstream (void) | |
| 1876 { | |
| 1877 int i; | |
| 1878 | |
| 1879 for (i = 0; i < countof (Vlstream_free_list); i++) | |
| 1880 { | |
| 1881 Vlstream_free_list[i] = Qnil; | |
| 1882 staticpro_nodump (&Vlstream_free_list[i]); | |
| 1883 } | |
| 1884 } | |
| 3263 | 1885 #endif /* not NEW_GC */ |
| 428 | 1886 |
| 1887 void | |
| 1888 vars_of_lstream (void) | |
| 1889 { | |
| 1890 } |