Mercurial > hg > xemacs-beta
annotate src/lstream.c @ 5784:0cb4f494a548
Have the result of coding_character_tell() reflect str->convert_to, too.
src/ChangeLog addition:
2014-01-22 Aidan Kehoe <kehoea@parhasard.net>
* text.c (buffered_bytecount_to_charcount): New.
Return the number of characters in a coding or lstream buffer,
including partial characters at the beginning of the buffer, but
not including those at the end. Refactored from
Lstream_character_tell().
* text.h:
* text.h (buffered_bytecount_to_charcount): Declare it.
* lstream.c (Lstream_character_tell):
Use the refactored buffered_bytecount_to_charcount () here, both
for the unget buffer and in_buffer.
* file-coding.c (coding_character_tell):
Check the character count of the lstream buffer too, when passing
back the character count from the coding stream.
| author | Aidan Kehoe <kehoea@parhasard.net> |
|---|---|
| date | Wed, 22 Jan 2014 17:52:00 +0000 |
| parents | 65d65b52d608 |
| children | 7343a186a475 |
| 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 | |
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8 XEmacs is free software: you can redistribute it and/or modify it |
| 428 | 9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation, either version 3 of the License, or (at your |
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11 option) any later version. |
| 428 | 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 | |
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19 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 428 | 20 |
| 21 /* Synched up with: Not in FSF. */ | |
| 22 | |
| 23 /* Written by Ben Wing. */ | |
| 24 | |
| 25 #include <config.h> | |
| 26 #include "lisp.h" | |
| 27 | |
| 28 #include "buffer.h" | |
| 29 #include "insdel.h" | |
| 30 #include "lstream.h" | |
| 31 | |
| 32 #include "sysfile.h" | |
| 33 | |
| 771 | 34 /* This module provides a generic buffering stream implementation. |
| 428 | 35 Conceptually, you send data to the stream or read data from the |
| 36 stream, not caring what's on the other end of the stream. The | |
| 37 other end could be another stream, a file descriptor, a stdio | |
| 38 stream, a fixed block of memory, a reallocating block of memory, | |
| 39 etc. The main purpose of the stream is to provide a standard | |
| 40 interface and to do buffering. Macros are defined to read | |
| 41 or write characters, so the calling functions do not have to | |
| 42 worry about blocking data together in order to achieve efficiency. | |
| 43 | |
| 771 | 44 Note that this object is called "stream" in Lisp but "lstream" |
| 428 | 45 in C. The reason for this is that "stream" is too generic a name |
| 46 for C; too much likelihood of conflict/confusion with C++, etc. */ | |
| 47 | |
| 48 #define DEFAULT_BLOCK_BUFFERING_SIZE 512 | |
| 49 #define MAX_READ_SIZE 512 | |
| 50 | |
| 51 static Lisp_Object | |
| 52 mark_lstream (Lisp_Object obj) | |
| 53 { | |
| 54 Lstream *lstr = XLSTREAM (obj); | |
| 55 return lstr->imp->marker ? (lstr->imp->marker) (obj) : Qnil; | |
| 56 } | |
| 57 | |
| 58 static void | |
| 2286 | 59 print_lstream (Lisp_Object obj, Lisp_Object printcharfun, |
| 60 int UNUSED (escapeflag)) | |
| 428 | 61 { |
| 62 Lstream *lstr = XLSTREAM (obj); | |
| 63 | |
| 800 | 64 write_fmt_string (printcharfun, |
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65 "#<INTERNAL OBJECT (XEmacs bug?) (%s lstream) 0x%x>", |
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66 lstr->imp->name, LISP_OBJECT_UID (obj)); |
| 428 | 67 } |
| 68 | |
| 69 static void | |
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70 finalize_lstream (Lisp_Object obj) |
| 428 | 71 { |
| 72 /* WARNING WARNING WARNING. This function (and all finalize functions) | |
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73 may get called more than once on the same object. */ |
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74 Lstream *lstr = XLSTREAM (obj); |
| 428 | 75 |
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76 if (lstr->flags & LSTREAM_FL_IS_OPEN) |
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77 Lstream_close (lstr); |
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78 |
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79 if (lstr->imp->finalizer) |
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80 (lstr->imp->finalizer) (lstr); |
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81 } |
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82 |
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83 static void |
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84 disksave_lstream (Lisp_Object lstream) |
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85 { |
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86 Lstream *lstr = XLSTREAM (lstream); |
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87 |
| 428 | 88 #if 0 /* this may cause weird Broken Pipes? */ |
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89 Lstream_pseudo_close (lstr); |
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90 return; |
| 428 | 91 #endif |
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92 if ((lstr->flags & LSTREAM_FL_IS_OPEN) && |
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93 (lstr->flags & LSTREAM_FL_CLOSE_AT_DISKSAVE)) |
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94 Lstream_close (lstr); |
| 428 | 95 } |
| 96 | |
| 665 | 97 inline static Bytecount |
| 98 aligned_sizeof_lstream (Bytecount lstream_type_specific_size) | |
| 456 | 99 { |
| 826 | 100 return MAX_ALIGN_SIZE (offsetof (Lstream, data) + |
| 101 lstream_type_specific_size); | |
| 456 | 102 } |
| 103 | |
| 665 | 104 static Bytecount |
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105 sizeof_lstream (Lisp_Object obj) |
| 428 | 106 { |
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107 return aligned_sizeof_lstream (XLSTREAM (obj)->imp->size); |
| 428 | 108 } |
| 109 | |
| 1204 | 110 static const struct memory_description lstream_implementation_description_1[] |
| 111 = { | |
| 112 { XD_END } | |
| 113 }; | |
| 114 | |
| 115 const struct sized_memory_description lstream_implementation_description = { | |
| 116 sizeof (struct lstream_implementation), | |
| 117 lstream_implementation_description_1 | |
| 118 }; | |
| 119 | |
| 120 static const struct sized_memory_description lstream_extra_description_map[] = | |
| 121 { | |
| 122 { offsetof (Lstream, imp) }, | |
| 123 { offsetof (struct lstream_implementation, extra_description) }, | |
| 124 { -1 }, | |
| 125 }; | |
| 126 | |
| 127 static const struct memory_description lstream_description[] = | |
| 128 { | |
| 2367 | 129 { XD_BLOCK_PTR, offsetof (Lstream, imp), 1, |
| 2551 | 130 { &lstream_implementation_description } }, |
| 2367 | 131 { XD_BLOCK_ARRAY, offsetof (Lstream, data), 1, |
| 2551 | 132 { lstream_extra_description_map } }, |
| 1204 | 133 { XD_END } |
| 134 }; | |
| 135 | |
| 136 static const struct memory_description lstream_empty_extra_description_1[] = | |
| 137 { | |
| 138 { XD_END } | |
| 139 }; | |
| 140 | |
| 141 const struct sized_memory_description lstream_empty_extra_description = { | |
| 142 0, lstream_empty_extra_description_1 | |
| 143 }; | |
| 144 | |
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145 DEFINE_NODUMP_SIZABLE_LISP_OBJECT ("stream", lstream, |
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146 mark_lstream, print_lstream, |
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147 finalize_lstream, |
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148 0, 0, /* no equal or hash */ |
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149 lstream_description, |
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150 sizeof_lstream, Lstream); |
| 428 | 151 |
| 771 | 152 |
| 153 /* Change the buffering of a stream. See lstream.h. By default the | |
| 154 buffering is STREAM_BLOCK_BUFFERED. */ | |
| 155 | |
| 428 | 156 void |
| 157 Lstream_set_buffering (Lstream *lstr, Lstream_buffering buffering, | |
| 158 int buffering_size) | |
| 159 { | |
| 160 lstr->buffering = buffering; | |
| 161 switch (buffering) | |
| 162 { | |
| 163 case LSTREAM_UNBUFFERED: | |
| 164 lstr->buffering_size = 0; break; | |
| 165 case LSTREAM_BLOCK_BUFFERED: | |
| 166 lstr->buffering_size = DEFAULT_BLOCK_BUFFERING_SIZE; break; | |
| 167 case LSTREAM_BLOCKN_BUFFERED: | |
| 168 lstr->buffering_size = buffering_size; break; | |
| 169 case LSTREAM_LINE_BUFFERED: | |
| 170 case LSTREAM_UNLIMITED: | |
| 171 lstr->buffering_size = INT_MAX; break; | |
| 172 } | |
| 173 } | |
| 174 | |
| 3263 | 175 #ifndef NEW_GC |
| 442 | 176 static const Lstream_implementation *lstream_types[32]; |
| 428 | 177 static Lisp_Object Vlstream_free_list[32]; |
| 178 static int lstream_type_count; | |
| 3263 | 179 #endif /* not NEW_GC */ |
| 428 | 180 |
| 771 | 181 /* Allocate and return a new Lstream. This function is not really |
| 182 meant to be called directly; rather, each stream type should | |
| 183 provide its own stream creation function, which creates the stream | |
| 184 and does any other necessary creation stuff (e.g. opening a | |
| 185 file). */ | |
| 186 | |
| 428 | 187 Lstream * |
| 442 | 188 Lstream_new (const Lstream_implementation *imp, const char *mode) |
| 428 | 189 { |
| 190 Lstream *p; | |
| 3263 | 191 #ifdef NEW_GC |
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192 p = XLSTREAM (ALLOC_SIZED_LISP_OBJECT (aligned_sizeof_lstream (imp->size), |
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193 lstream)); |
| 3263 | 194 #else /* not NEW_GC */ |
| 428 | 195 int i; |
| 196 | |
| 197 for (i = 0; i < lstream_type_count; i++) | |
| 198 { | |
| 199 if (lstream_types[i] == imp) | |
| 200 break; | |
| 201 } | |
| 202 | |
| 203 if (i == lstream_type_count) | |
| 204 { | |
| 205 assert (lstream_type_count < countof (lstream_types)); | |
| 206 lstream_types[lstream_type_count] = imp; | |
| 207 Vlstream_free_list[lstream_type_count] = | |
| 456 | 208 make_lcrecord_list (aligned_sizeof_lstream (imp->size), |
| 428 | 209 &lrecord_lstream); |
| 210 lstream_type_count++; | |
| 211 } | |
| 212 | |
| 1204 | 213 p = XLSTREAM (alloc_managed_lcrecord (Vlstream_free_list[i])); |
| 3263 | 214 #endif /* not NEW_GC */ |
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215 /* Formerly, we zeroed out the object minus its header, but it's now |
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216 handled automatically. ALLOC_SIZED_LISP_OBJECT() always zeroes out |
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217 the whole object other than its header, and alloc_managed_lcrecord() |
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218 does the same. */ |
| 428 | 219 p->imp = imp; |
| 220 Lstream_set_buffering (p, LSTREAM_BLOCK_BUFFERED, 0); | |
| 221 p->flags = LSTREAM_FL_IS_OPEN; | |
| 222 | |
| 223 /* convert mode (one of "r", "w", "rc", "wc") to p->flags */ | |
| 224 assert (mode[0] == 'r' || mode[0] == 'w'); | |
| 225 assert (mode[1] == 'c' || mode[1] == '\0'); | |
| 226 p->flags |= (mode[0] == 'r' ? LSTREAM_FL_READ : LSTREAM_FL_WRITE); | |
| 227 if (mode[1] == 'c') | |
| 228 p->flags |= LSTREAM_FL_NO_PARTIAL_CHARS; | |
| 229 | |
| 230 return p; | |
| 231 } | |
| 232 | |
| 771 | 233 /* Set or unset "character mode" on the stream. The basic idea is that, |
| 234 assuming valid internal-format data is passing through the stream and | |
| 235 we're processing the data character by character, we don't want partial | |
| 236 characters at the end of the data. (No partial characters at the | |
| 237 beginning happens naturally if we eliminate partial characters at the | |
| 238 end and the stream is implemented correctly.) | |
| 239 | |
| 240 Character mode actually has two somewhat different meanings, depending | |
| 241 on whether this is a read stream or write stream. If a read stream, | |
| 242 character mode means that data returned from calling Lstream_read() on | |
| 243 the stream will contain only full characters. If a write stream, | |
| 244 character mode means that data passed to the write method in the stream | |
| 245 implementation will contain only full characters. It's important to | |
| 246 note the non-parallelism in who should set this mode on the stream: The | |
| 247 *CALLER* sets character mode on read streams it creates; the *STREAM | |
| 248 ITSELF* sets character mode on write streams, typically at creation | |
| 814 | 249 time. |
| 250 | |
| 251 (However, if a read stream always generates internal-format data, then | |
| 252 the callers will almost always want character mode, and it's allowed to | |
| 253 set this on behalf of the caller, as long as a flag can be provided at | |
| 254 creation time to disable this behavior.) */ | |
| 771 | 255 |
| 428 | 256 void |
| 257 Lstream_set_character_mode (Lstream *lstr) | |
| 258 { | |
| 259 lstr->flags |= LSTREAM_FL_NO_PARTIAL_CHARS; | |
| 260 } | |
| 261 | |
| 771 | 262 /* Unset character mode. See Lstream_set_character_mode(). */ |
| 263 | |
| 264 void | |
| 265 Lstream_unset_character_mode (Lstream *lstr) | |
| 266 { | |
| 267 lstr->flags &= ~LSTREAM_FL_NO_PARTIAL_CHARS; | |
| 268 } | |
| 269 | |
| 270 /* Close the stream (if it's open), and free all memory associated with the | |
| 271 stream. Put the stream on a free list; later calls to create a new | |
| 272 stream of this type may reuse this stream. Calling this is not strictly | |
| 273 necessary, but it is much more efficient than having the Lstream be | |
| 274 garbage-collected. Be VERY VERY SURE there are no pointers to this | |
| 275 object hanging around anywhere where they might be used! When streams | |
| 276 are chained together, be VERY CAREFUL of the order in which you delete | |
| 277 them! (e.g. if the streams are in a singly-linked list, delete the head | |
| 814 | 278 first; this will close (but check the documentation, e.g. of |
| 279 make_coding_input_stream()), and may send data down to the rest. Then | |
| 771 | 280 proceed to the rest, one by one. If the chains are in a doubly-linked |
| 281 list, close all the streams first (again, from the head to the tail), | |
| 282 disconnect the back links, then delete starting from the head. In | |
| 814 | 283 general, it's a good idea to close everything before deleting anything. |
| 771 | 284 |
| 285 NOTE: DO NOT CALL DURING GARBAGE COLLECTION (e.g. in a finalizer). You | |
| 286 will be aborted. See free_managed_lcrecord(). */ | |
| 287 | |
| 428 | 288 void |
| 289 Lstream_delete (Lstream *lstr) | |
| 290 { | |
| 3263 | 291 #ifndef NEW_GC |
| 428 | 292 int i; |
| 3263 | 293 #endif /* not NEW_GC */ |
| 793 | 294 Lisp_Object val = wrap_lstream (lstr); |
| 428 | 295 |
| 3263 | 296 #ifdef NEW_GC |
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297 free_normal_lisp_object (val); |
| 3263 | 298 #else /* not NEW_GC */ |
| 428 | 299 for (i = 0; i < lstream_type_count; i++) |
| 300 { | |
| 301 if (lstream_types[i] == lstr->imp) | |
| 302 { | |
| 303 free_managed_lcrecord (Vlstream_free_list[i], val); | |
| 304 return; | |
| 305 } | |
| 306 } | |
| 307 | |
| 2500 | 308 ABORT (); |
| 3263 | 309 #endif /* not NEW_GC */ |
| 428 | 310 } |
| 311 | |
| 312 #define Lstream_internal_error(reason, lstr) \ | |
| 563 | 313 signal_error (Qinternal_error, reason, wrap_lstream (lstr)) |
| 428 | 314 |
| 771 | 315 /* Reopen a closed stream. This enables I/O on it again. This is not |
| 316 meant to be called except from a wrapper routine that reinitializes | |
| 317 variables and such -- the close routine may well have freed some | |
| 318 necessary storage structures, for example. */ | |
| 319 | |
| 428 | 320 void |
| 321 Lstream_reopen (Lstream *lstr) | |
| 322 { | |
| 323 if (lstr->flags & LSTREAM_FL_IS_OPEN) | |
| 324 Lstream_internal_error ("lstream already open", lstr); | |
| 325 lstr->flags |= LSTREAM_FL_IS_OPEN; | |
| 326 } | |
| 327 | |
| 771 | 328 /* Try to write as much of DATA as possible to the stream. Return the |
| 329 number of bytes written. */ | |
| 428 | 330 |
| 771 | 331 static int |
| 332 Lstream_really_write (Lstream *lstr, const unsigned char *data, int size) | |
| 428 | 333 { |
| 665 | 334 Bytecount num_written; |
| 771 | 335 const unsigned char *orig_data = data; |
| 336 int error_occurred = 0; | |
| 428 | 337 |
| 771 | 338 while (size > 0) |
| 428 | 339 { |
| 340 if (! (lstr->flags & LSTREAM_FL_IS_OPEN)) | |
| 341 Lstream_internal_error ("lstream not open", lstr); | |
| 342 if (! (lstr->flags & LSTREAM_FL_WRITE)) | |
| 343 Lstream_internal_error ("lstream not open for writing", lstr); | |
| 344 if (!lstr->imp->writer) | |
| 345 Lstream_internal_error ("lstream has no writer", lstr); | |
| 346 | |
| 347 if (lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS) | |
| 348 /* It's quite possible for us to get passed an incomplete | |
| 349 character at the end. We need to spit back that | |
| 350 incomplete character. */ | |
| 351 { | |
| 442 | 352 const unsigned char *dataend = data + size - 1; |
| 428 | 353 assert (size > 0); /* safety check ... */ |
| 354 /* Optimize the most common case. */ | |
| 826 | 355 if (!byte_ascii_p (*dataend)) |
| 428 | 356 { |
| 357 /* Go back to the beginning of the last (and possibly partial) | |
| 358 character, and bump forward to see if the character is | |
| 359 complete. */ | |
| 867 | 360 VALIDATE_IBYTEPTR_BACKWARD (dataend); |
| 826 | 361 if (dataend + rep_bytes_by_first_byte (*dataend) != data + size) |
| 428 | 362 /* If not, chop the size down to ignore the last char |
| 363 and stash it away for next time. */ | |
| 364 size = dataend - data; | |
| 365 /* If we don't even have one character to write, then just | |
| 366 skip out. */ | |
| 367 if (size == 0) | |
| 368 break; | |
| 369 } | |
| 370 } | |
| 371 | |
| 771 | 372 num_written = (lstr->imp->writer) (lstr, data, size); |
| 428 | 373 if (num_written == 0) |
| 374 /* If nothing got written, then just hold the data. This may | |
| 375 occur, for example, if this stream does non-blocking I/O; | |
| 376 the attempt to write the data might have resulted in an | |
| 377 EWOULDBLOCK error. */ | |
| 771 | 378 break; |
| 379 else if (num_written > size) | |
| 2500 | 380 ABORT (); |
| 428 | 381 else if (num_written > 0) |
| 382 { | |
| 771 | 383 data += num_written; |
| 384 size -= num_written; | |
| 428 | 385 } |
| 386 else | |
| 771 | 387 { |
| 388 /* If error, just hold the data, for similar reasons as above. */ | |
| 389 error_occurred = 1; | |
| 390 break; | |
| 391 } | |
| 428 | 392 } |
| 393 | |
| 2383 | 394 if (!error_occurred && lstr->imp->flusher) |
| 771 | 395 error_occurred = (lstr->imp->flusher) (lstr) < 0; |
| 396 | |
| 397 if (data == orig_data && error_occurred) | |
| 398 return -1; | |
| 399 | |
| 400 return data - orig_data; | |
| 401 } | |
| 402 | |
| 403 /* Attempt to flush out all of the buffered data for writing. Leaves | |
| 404 whatever wasn't flushed sitting in the stream's buffers. Return -1 if | |
| 405 nothing written and error occurred, 0 otherwise. */ | |
| 428 | 406 |
| 771 | 407 int |
| 408 Lstream_flush_out (Lstream *lstr) | |
| 409 { | |
| 410 Bytecount num_written = | |
| 411 Lstream_really_write (lstr, lstr->out_buffer, lstr->out_buffer_ind); | |
| 412 if (num_written == lstr->out_buffer_ind) | |
| 413 { | |
| 414 lstr->out_buffer_ind = 0; | |
| 415 return 0; | |
| 416 } | |
| 417 else if (num_written > 0) | |
| 418 { | |
| 419 memmove (lstr->out_buffer, lstr->out_buffer + num_written, | |
| 420 lstr->out_buffer_ind - num_written); | |
| 421 lstr->out_buffer_ind -= num_written; | |
| 422 return 0; | |
| 423 } | |
| 424 else return num_written; | |
| 428 | 425 } |
| 426 | |
| 771 | 427 /* Flush out any pending unwritten data in the stream. Clear any buffered |
| 428 input data. This differs from Lstream_flush_out() in that it also | |
| 429 clears any unflushable buffered data. Returns 0 on success, -1 on | |
| 430 error. */ | |
| 431 | |
| 428 | 432 int |
| 433 Lstream_flush (Lstream *lstr) | |
| 434 { | |
| 435 if (Lstream_flush_out (lstr) < 0) | |
| 436 return -1; | |
| 437 | |
| 438 /* clear out buffered data */ | |
| 439 lstr->in_buffer_current = lstr->in_buffer_ind = 0; | |
| 440 lstr->unget_buffer_ind = 0; | |
| 441 | |
| 442 return 0; | |
| 443 } | |
| 444 | |
| 445 /* We want to add NUM characters. This function ensures that the | |
| 446 buffer is large enough for this (per the buffering size specified | |
| 447 in the stream) and returns the number of characters we can | |
| 448 actually write. If FORCE is set, ignore the buffering size | |
| 449 and go ahead and make space for all the chars even if it exceeds | |
| 450 the buffering size. (This is used to deal with the possibility | |
| 451 that the stream writer might refuse to write any bytes now, e.g. | |
| 452 if it's getting EWOULDBLOCK errors. We have to keep stocking them | |
| 771 | 453 up until they can be written, so as to avoid losing data.) */ |
| 428 | 454 |
| 665 | 455 static Bytecount |
| 456 Lstream_adding (Lstream *lstr, Bytecount num, int force) | |
| 428 | 457 { |
| 665 | 458 Bytecount size = num + lstr->out_buffer_ind; |
| 430 | 459 |
| 460 if (size <= lstr->out_buffer_size) | |
| 461 return num; | |
| 462 | |
| 428 | 463 /* Maybe chop it down so that we don't buffer more characters |
| 464 than our advertised buffering size. */ | |
| 430 | 465 if ((size > lstr->buffering_size) && !force) |
| 466 { | |
| 467 size = lstr->buffering_size; | |
| 468 /* There might be more data buffered than the buffering size. */ | |
| 469 if (size <= lstr->out_buffer_ind) | |
| 470 return 0; | |
| 471 } | |
| 472 | |
| 473 DO_REALLOC (lstr->out_buffer, lstr->out_buffer_size, size, unsigned char); | |
| 474 | |
| 475 return size - lstr->out_buffer_ind; | |
| 428 | 476 } |
| 477 | |
| 478 /* Like Lstream_write(), but does not handle line-buffering correctly. */ | |
| 479 | |
| 771 | 480 static int |
| 665 | 481 Lstream_write_1 (Lstream *lstr, const void *data, Bytecount size) |
| 428 | 482 { |
| 442 | 483 const unsigned char *p = (const unsigned char *) data; |
| 665 | 484 Bytecount off = 0; |
| 428 | 485 if (! (lstr->flags & LSTREAM_FL_IS_OPEN)) |
| 486 Lstream_internal_error ("lstream not open", lstr); | |
| 487 if (! (lstr->flags & LSTREAM_FL_WRITE)) | |
| 488 Lstream_internal_error ("lstream not open for writing", lstr); | |
| 771 | 489 |
| 490 if (lstr->buffering == LSTREAM_UNBUFFERED) | |
| 491 { | |
| 492 /* If there is buffered data, it means we ran into blocking | |
| 493 errors the previous time and had to buffer our remaining | |
| 494 data. Try to write it now. */ | |
| 495 if (lstr->out_buffer_ind > 0) | |
| 496 { | |
| 497 if (Lstream_flush_out (lstr) < 0) | |
| 498 return -1; | |
| 499 } | |
| 500 | |
| 501 /* If not still blocked, try to write the new data */ | |
| 502 if (lstr->out_buffer_ind == 0) | |
| 503 { | |
| 504 /* we don't need to loop because Lstream_really_write does that | |
| 505 for us. */ | |
| 506 Bytecount num_written = Lstream_really_write (lstr, p, size); | |
| 507 if (num_written < 0) | |
| 508 return -1; | |
| 509 off += num_written; | |
| 510 } | |
| 511 | |
| 512 /* squirrel away the rest of the data */ | |
| 513 if (off < size) | |
| 514 { | |
| 515 Lstream_adding (lstr, size - off, 1); | |
| 516 memcpy (lstr->out_buffer + lstr->out_buffer_ind, p + off, | |
| 517 size - off); | |
| 518 lstr->out_buffer_ind += size - off; | |
| 519 } | |
| 520 | |
| 521 lstr->byte_count += size; | |
| 522 return 0; | |
| 523 } | |
| 524 else | |
| 525 { | |
| 526 int couldnt_write_last_time = 0; | |
| 428 | 527 |
| 771 | 528 while (1) |
| 529 { | |
| 530 /* Figure out how much we can add to the buffer */ | |
| 531 Bytecount chunk = Lstream_adding (lstr, size, 0); | |
| 532 if (chunk == 0) | |
| 533 { | |
| 534 if (couldnt_write_last_time) | |
| 535 /* Ung, we ran out of space and tried to flush | |
| 536 the buffer, but it didn't work because the stream | |
| 537 writer is refusing to accept any data. So we | |
| 538 just have to squirrel away all the rest of the | |
| 539 stuff. */ | |
| 540 chunk = Lstream_adding (lstr, size, 1); | |
| 541 else | |
| 542 couldnt_write_last_time = 1; | |
| 543 } | |
| 544 /* Do it. */ | |
| 545 if (chunk > 0) | |
| 546 { | |
| 547 memcpy (lstr->out_buffer + lstr->out_buffer_ind, p + off, chunk); | |
| 548 lstr->out_buffer_ind += chunk; | |
| 549 lstr->byte_count += chunk; | |
| 550 size -= chunk; | |
| 551 off += chunk; | |
| 552 } | |
| 553 /* If the buffer is full and we have more to add, flush it out. */ | |
| 554 if (size > 0) | |
| 555 { | |
| 556 if (Lstream_flush_out (lstr) < 0) | |
| 557 { | |
| 558 if (off == 0) | |
| 559 return -1; | |
| 560 else | |
| 561 return 0; | |
| 562 } | |
| 563 } | |
| 564 else | |
| 565 break; | |
| 566 } | |
| 567 } | |
| 568 return 0; | |
| 428 | 569 } |
| 570 | |
| 771 | 571 /* Write SIZE bytes of DATA to the stream. Return value is 0 on success, |
| 572 -1 on error. -1 is only returned when no bytes could be written; if any | |
| 573 bytes could be written, then 0 is returned and any unwritten bytes are | |
| 574 buffered and the next call to Lstream_write() will try to write them | |
| 575 again. (This buffering happens even when the stream's buffering type is | |
| 576 LSTREAM_UNBUFFERED, and regardless of how much data is passed in or what | |
| 577 the stream's buffering size was set to. #### There should perhaps be a | |
| 578 way to control whether this happens.) */ | |
| 428 | 579 |
| 771 | 580 int |
| 665 | 581 Lstream_write (Lstream *lstr, const void *data, Bytecount size) |
| 428 | 582 { |
| 665 | 583 Bytecount i; |
| 442 | 584 const unsigned char *p = (const unsigned char *) data; |
| 428 | 585 |
| 771 | 586 /* If the stream is not line-buffered, then we can just call |
| 587 Lstream_write_1(), which writes in chunks. Otherwise, we repeatedly | |
| 588 call Lstream_putc(), which knows how to handle line buffering. | |
| 589 Returns 0 on success, -1 on failure. */ | |
| 590 | |
| 428 | 591 if (size == 0) |
| 771 | 592 return 0; |
| 428 | 593 if (lstr->buffering != LSTREAM_LINE_BUFFERED) |
| 594 return Lstream_write_1 (lstr, data, size); | |
| 595 for (i = 0; i < size; i++) | |
| 596 { | |
| 597 if (Lstream_putc (lstr, p[i]) < 0) | |
| 598 break; | |
| 599 } | |
| 771 | 600 return i == 0 ? -1 : 0; |
| 428 | 601 } |
| 602 | |
| 603 int | |
| 604 Lstream_was_blocked_p (Lstream *lstr) | |
| 605 { | |
| 606 return lstr->imp->was_blocked_p ? lstr->imp->was_blocked_p (lstr) : 0; | |
| 607 } | |
| 608 | |
| 665 | 609 static Bytecount |
| 462 | 610 Lstream_raw_read (Lstream *lstr, unsigned char *buffer, |
| 665 | 611 Bytecount size) |
| 428 | 612 { |
| 613 if (! (lstr->flags & LSTREAM_FL_IS_OPEN)) | |
| 614 Lstream_internal_error ("lstream not open", lstr); | |
| 615 if (! (lstr->flags & LSTREAM_FL_READ)) | |
| 616 Lstream_internal_error ("lstream not open for reading", lstr); | |
| 617 if (!lstr->imp->reader) | |
| 618 Lstream_internal_error ("lstream has no reader", lstr); | |
| 619 | |
| 620 return (lstr->imp->reader) (lstr, buffer, size); | |
| 621 } | |
| 622 | |
| 623 /* Assuming the buffer is empty, fill it up again. */ | |
| 624 | |
| 665 | 625 static Bytecount |
| 428 | 626 Lstream_read_more (Lstream *lstr) |
| 627 { | |
| 628 #if 0 | |
| 665 | 629 Bytecount size_needed |
| 462 | 630 = max (1, min (MAX_READ_SIZE, lstr->buffering_size)); |
| 428 | 631 #else |
| 632 /* If someone requested a larger buffer size, so be it! */ | |
| 665 | 633 Bytecount size_needed = |
| 462 | 634 max (1, lstr->buffering_size); |
| 428 | 635 #endif |
| 665 | 636 Bytecount size_gotten; |
| 428 | 637 |
| 638 DO_REALLOC (lstr->in_buffer, lstr->in_buffer_size, | |
| 639 size_needed, unsigned char); | |
| 640 size_gotten = Lstream_raw_read (lstr, lstr->in_buffer, size_needed); | |
| 641 lstr->in_buffer_current = max (0, size_gotten); | |
| 642 lstr->in_buffer_ind = 0; | |
| 643 return size_gotten < 0 ? -1 : size_gotten; | |
| 644 } | |
| 645 | |
| 771 | 646 /* Read SIZE bytes of DATA from the stream. Return the number of bytes |
| 647 read. 0 means EOF (#### sometimes; it may simply indicate we can't read | |
| 648 any data at other times, particularly if SIZE is too small. this needs | |
| 649 to be fixed!). -1 means an error occurred and no bytes were read. */ | |
| 650 | |
| 814 | 651 static Bytecount |
| 652 Lstream_read_1 (Lstream *lstr, void *data, Bytecount size, | |
| 653 int override_no_partial_chars) | |
| 428 | 654 { |
| 655 unsigned char *p = (unsigned char *) data; | |
| 665 | 656 Bytecount off = 0; |
| 657 Bytecount chunk; | |
| 428 | 658 int error_occurred = 0; |
| 659 | |
| 660 if (size == 0) | |
| 661 return 0; | |
| 662 | |
| 663 /* First try to get some data from the unget buffer */ | |
| 664 chunk = min (size, lstr->unget_buffer_ind); | |
| 665 if (chunk > 0) | |
| 666 { | |
| 667 /* The bytes come back in reverse order. */ | |
| 668 for (; off < chunk; off++) | |
| 669 p[off] = lstr->unget_buffer[--lstr->unget_buffer_ind]; | |
| 670 lstr->byte_count += chunk; | |
| 671 size -= chunk; | |
| 672 } | |
| 673 | |
| 674 while (size > 0) | |
| 675 { | |
| 771 | 676 /* If unbuffered, then simply read directly into output buffer. |
| 677 No need to copy. */ | |
| 678 if (lstr->buffering == LSTREAM_UNBUFFERED) | |
| 679 { | |
| 680 chunk = Lstream_raw_read (lstr, p + off, size); | |
| 681 if (chunk < 0) | |
| 682 error_occurred = 1; | |
| 683 if (chunk <= 0) | |
| 684 break; | |
| 685 lstr->byte_count += chunk; | |
| 428 | 686 size -= chunk; |
| 771 | 687 off += chunk; |
| 688 } | |
| 689 else | |
| 428 | 690 { |
| 771 | 691 /* Take whatever we can from the in buffer */ |
| 692 chunk = min (size, lstr->in_buffer_current - lstr->in_buffer_ind); | |
| 693 if (chunk > 0) | |
| 694 { | |
| 695 memcpy (p + off, lstr->in_buffer + lstr->in_buffer_ind, chunk); | |
| 696 lstr->in_buffer_ind += chunk; | |
| 697 lstr->byte_count += chunk; | |
| 698 size -= chunk; | |
| 699 off += chunk; | |
| 700 } | |
| 701 | |
| 702 /* If we need some more, try to get some more from the | |
| 703 stream's end */ | |
| 704 if (size > 0) | |
| 705 { | |
| 706 Bytecount retval = Lstream_read_more (lstr); | |
| 707 if (retval < 0) | |
| 708 error_occurred = 1; | |
| 709 if (retval <= 0) | |
| 710 break; | |
| 711 } | |
| 428 | 712 } |
| 713 } | |
| 714 | |
| 814 | 715 if ((lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS) && |
| 716 !override_no_partial_chars) | |
| 428 | 717 { |
| 718 /* It's quite possible for us to get passed an incomplete | |
| 719 character at the end. We need to spit back that | |
| 720 incomplete character. */ | |
| 867 | 721 Bytecount newoff = validate_ibyte_string_backward (p, off); |
| 771 | 722 if (newoff < off) |
| 428 | 723 { |
| 771 | 724 Lstream_unread (lstr, p + newoff, off - newoff); |
| 725 off = newoff; | |
| 428 | 726 } |
| 727 } | |
| 728 | |
| 462 | 729 return off == 0 && error_occurred ? -1 : off; |
| 428 | 730 } |
| 731 | |
| 814 | 732 Bytecount |
| 733 Lstream_read (Lstream *lstr, void *data, Bytecount size) | |
| 734 { | |
| 735 return Lstream_read_1 (lstr, data, size, 0); | |
| 736 } | |
| 737 | |
|
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738 Charcount |
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739 Lstream_character_tell (Lstream *lstr) |
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740 { |
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741 Charcount ctell = lstr->imp->character_tell ? |
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742 lstr->imp->character_tell (lstr) : -1; |
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743 |
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744 if (ctell >= 0) |
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745 { |
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746 /* Our implementation's character tell code doesn't know about the |
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747 unget buffer, update its figure to reflect it. */ |
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748 ctell += lstr->unget_character_count; |
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749 |
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750 if (lstr->unget_buffer_ind > 0) |
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751 { |
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752 /* The character count should not include those characters |
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753 currently *in* the unget buffer, subtract that count. */ |
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754 Ibyte *ungot, *ungot_ptr; |
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5784
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755 Bytecount ii = lstr->unget_buffer_ind; |
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756 |
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757 ungot_ptr = ungot |
|
5784
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758 = alloca_ibytes (lstr->unget_buffer_ind); |
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759 |
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760 /* Internal format data, but in reverse order. There's not |
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761 actually a need to alloca here, we could work out the character |
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762 count directly from the reversed bytes, but the alloca approach |
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763 is more robust to changes in our internal format, and the unget |
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764 buffer is not going to blow the stack. */ |
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765 while (ii > 0) |
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766 { |
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767 *ungot_ptr++ = lstr->unget_buffer[--ii]; |
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768 } |
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769 |
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770 /* The character length of this text is included in |
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771 unget_character_count; if the bytes are still in the unget |
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772 buffer, then our consumers haven't seen them, and so the |
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773 character tell figure shouldn't reflect them. Subtract it from |
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774 the total. */ |
|
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775 ctell |
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776 -= buffered_bytecount_to_charcount (ungot, ungot_ptr - ungot); |
|
5776
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777 } |
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778 |
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779 if (lstr->in_buffer_ind < lstr->in_buffer_current) |
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780 { |
|
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781 ctell |
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782 -= buffered_bytecount_to_charcount ((const Ibyte *) |
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783 (lstr->in_buffer |
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784 + lstr->in_buffer_ind), |
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785 lstr->in_buffer_current |
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786 - lstr->in_buffer_ind); |
|
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787 } |
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788 |
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789 text_checking_assert (ctell >= 0); |
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790 } |
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791 |
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792 return ctell; |
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793 } |
| 814 | 794 |
| 771 | 795 /* Push back SIZE bytes of DATA onto the input queue. The next call |
| 796 to Lstream_read() with the same size will read the same bytes back. | |
| 797 Note that this will be the case even if there is other pending | |
| 798 unread data. */ | |
| 799 | |
| 428 | 800 void |
| 665 | 801 Lstream_unread (Lstream *lstr, const void *data, Bytecount size) |
| 428 | 802 { |
| 442 | 803 const unsigned char *p = (const unsigned char *) data; |
| 428 | 804 |
| 805 /* Make sure buffer is big enough */ | |
| 806 DO_REALLOC (lstr->unget_buffer, lstr->unget_buffer_size, | |
| 807 lstr->unget_buffer_ind + size, unsigned char); | |
| 808 | |
| 809 lstr->byte_count -= size; | |
| 810 | |
| 811 /* Bytes have to go on in reverse order -- they are reversed | |
| 812 again when read back. */ | |
| 813 while (size--) | |
|
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814 { |
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815 lstr->unget_buffer[lstr->unget_buffer_ind++] = p[size]; |
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816 /* If we see a valid first byte, that is the last octet in a |
|
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817 character, so increase the count of ungot characters. */ |
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818 lstr->unget_character_count += valid_ibyteptr_p (p + size); |
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819 } |
| 428 | 820 } |
| 821 | |
| 771 | 822 /* Rewind the stream to the beginning. */ |
| 823 | |
| 428 | 824 int |
| 825 Lstream_rewind (Lstream *lstr) | |
| 826 { | |
| 827 if (!lstr->imp->rewinder) | |
| 828 Lstream_internal_error ("lstream has no rewinder", lstr); | |
| 829 if (Lstream_flush (lstr) < 0) | |
| 830 return -1; | |
| 831 lstr->byte_count = 0; | |
|
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832 lstr->unget_character_count = 0; |
| 428 | 833 return (lstr->imp->rewinder) (lstr); |
| 834 } | |
| 835 | |
| 836 int | |
| 837 Lstream_seekable_p (Lstream *lstr) | |
| 838 { | |
| 839 if (!lstr->imp->rewinder) | |
| 840 return 0; | |
| 841 if (!lstr->imp->seekable_p) | |
| 842 return 1; | |
| 843 return (lstr->imp->seekable_p) (lstr); | |
| 844 } | |
| 845 | |
| 846 static int | |
| 847 Lstream_pseudo_close (Lstream *lstr) | |
| 848 { | |
| 1943 | 849 if (! (lstr->flags & LSTREAM_FL_IS_OPEN)) |
| 428 | 850 Lstream_internal_error ("lstream is not open", lstr); |
| 851 | |
| 852 /* don't check errors here -- best not to risk file descriptor loss */ | |
| 853 return Lstream_flush (lstr); | |
| 854 } | |
| 855 | |
|
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856 /* Close the stream without flushing buffers. |
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857 In current practice, this is only useful when a subprocess terminates |
|
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858 unexpectedly, and the OS closes its pipes without warning. In that case, |
|
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859 we do not want to flush our output buffers, as there is no longer a pipe |
|
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860 to write to. |
|
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861 This nomenclature may deserve review if XEmacs starts getting called as |
|
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862 a subprocess. */ |
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863 |
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864 int |
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865 Lstream_close_noflush (Lstream *lstr) |
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866 { |
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867 lstr->flags &= ~LSTREAM_FL_IS_OPEN; |
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868 lstr->byte_count = 0; |
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869 /* Note that Lstream_flush() reset all the buffer indices. That way, |
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870 the next call to Lstream_putc(), Lstream_getc(), or Lstream_ungetc() |
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871 on a closed stream will call into the function equivalents, which will |
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872 cause an error. */ |
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873 |
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874 /* We set the pointers to 0 so that we don't lose when this function |
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875 is called more than once on the same object */ |
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876 if (lstr->out_buffer) |
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877 { |
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878 xfree (lstr->out_buffer); |
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879 lstr->out_buffer = 0; |
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880 } |
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881 if (lstr->in_buffer) |
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882 { |
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883 xfree (lstr->in_buffer); |
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884 lstr->in_buffer = 0; |
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885 } |
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886 if (lstr->unget_buffer) |
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887 { |
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888 xfree (lstr->unget_buffer); |
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889 lstr->unget_buffer = 0; |
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890 } |
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891 |
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892 return 0; |
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893 } |
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894 |
| 771 | 895 /* Close the stream. All data will be flushed out. If the stream is |
| 896 already closed, nothing happens. Note that, even if all data has | |
| 897 already been flushed out, the act of closing a stream may generate more | |
| 898 data -- for example, if the stream implements some sort of conversion, | |
| 899 such as gzip, there may be special "end-data" that need to be written | |
| 900 out when the file is closed. */ | |
| 901 | |
| 428 | 902 int |
| 903 Lstream_close (Lstream *lstr) | |
| 904 { | |
| 905 int rc = 0; | |
| 906 | |
| 907 if (lstr->flags & LSTREAM_FL_IS_OPEN) | |
| 908 { | |
| 909 rc = Lstream_pseudo_close (lstr); | |
| 910 /* | |
| 911 * We used to return immediately if the closer method reported | |
| 912 * failure, leaving the stream open. But this is no good, for | |
| 913 * the following reasons. | |
| 914 * | |
| 915 * 1. The finalizer method used in GC makes no provision for | |
| 916 * failure, so we must not return without freeing buffer | |
| 917 * memory. | |
| 918 * | |
| 919 * 2. The closer method may have already freed some memory | |
| 920 * used for I/O in this stream. E.g. encoding_closer frees | |
| 921 * ENCODING_STREAM_DATA(stream)->runoff. If a writer method | |
| 922 * tries to use this buffer later, it will write into memory | |
| 923 * that may have been allocated elsewhere. Sometime later | |
| 924 * you will see a sign that says "Welcome to Crash City." | |
| 925 * | |
| 926 * 3. The closer can report failure if a flush fails in the | |
| 927 * other stream in a MULE encoding/decoding stream pair. | |
| 928 * The other stream in the pair is closed, but returning | |
| 929 * early leaves the current stream open. If we try to | |
| 930 * flush the current stream later, we will crash when the | |
| 931 * flusher notices that the other end stream is closed. | |
| 932 * | |
| 933 * So, we no longer abort the close if the closer method | |
| 934 * reports some kind of failure. We still report the failure | |
| 935 * to the caller. | |
| 936 */ | |
| 937 if (lstr->imp->closer) | |
| 938 if ((lstr->imp->closer) (lstr) < 0) | |
| 939 rc = -1; | |
| 940 } | |
| 941 | |
|
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942 Lstream_close_noflush (lstr); |
| 428 | 943 |
| 944 return rc; | |
| 945 } | |
| 946 | |
| 771 | 947 |
| 948 /* Function equivalent of Lstream_putc(). */ | |
| 949 | |
| 428 | 950 int |
| 951 Lstream_fputc (Lstream *lstr, int c) | |
| 952 { | |
| 953 unsigned char ch = (unsigned char) c; | |
| 771 | 954 int retval = Lstream_write_1 (lstr, &ch, 1); |
| 955 if (retval == 0 && lstr->buffering == LSTREAM_LINE_BUFFERED && ch == '\n') | |
| 428 | 956 return Lstream_flush_out (lstr); |
| 771 | 957 return retval; |
| 428 | 958 } |
| 959 | |
| 771 | 960 /* Function equivalent of Lstream_getc(). */ |
| 961 | |
| 428 | 962 int |
| 963 Lstream_fgetc (Lstream *lstr) | |
| 964 { | |
| 965 unsigned char ch; | |
| 814 | 966 if (Lstream_read_1 (lstr, &ch, 1, 1) <= 0) |
| 428 | 967 return -1; |
| 968 return ch; | |
| 969 } | |
| 970 | |
| 771 | 971 /* Function equivalent of Lstream_ungetc(). */ |
| 972 | |
| 428 | 973 void |
| 974 Lstream_fungetc (Lstream *lstr, int c) | |
| 975 { | |
| 976 unsigned char ch = (unsigned char) c; | |
| 977 Lstream_unread (lstr, &ch, 1); | |
| 978 } | |
| 979 | |
| 980 | |
| 981 /************************ some stream implementations *********************/ | |
| 982 | |
| 983 /*********** a stdio stream ***********/ | |
| 984 | |
| 985 struct stdio_stream | |
| 986 { | |
| 987 FILE *file; | |
| 988 int closing; | |
| 989 }; | |
| 990 | |
| 991 #define STDIO_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, stdio) | |
| 992 | |
| 771 | 993 DEFINE_LSTREAM_IMPLEMENTATION ("stdio", stdio); |
| 428 | 994 |
| 995 static Lisp_Object | |
| 442 | 996 make_stdio_stream_1 (FILE *stream, int flags, const char *mode) |
| 428 | 997 { |
| 998 Lstream *lstr = Lstream_new (lstream_stdio, mode); | |
| 999 struct stdio_stream *str = STDIO_STREAM_DATA (lstr); | |
| 1000 str->file = stream; | |
| 1001 str->closing = flags & LSTR_CLOSING; | |
| 1002 lstr->flags |= LSTREAM_FL_CLOSE_AT_DISKSAVE; | |
| 793 | 1003 return wrap_lstream (lstr); |
| 428 | 1004 } |
| 1005 | |
| 1006 Lisp_Object | |
| 1007 make_stdio_input_stream (FILE *stream, int flags) | |
| 1008 { | |
| 1009 return make_stdio_stream_1 (stream, flags, "r"); | |
| 1010 } | |
| 1011 | |
| 1012 Lisp_Object | |
| 1013 make_stdio_output_stream (FILE *stream, int flags) | |
| 1014 { | |
| 1015 return make_stdio_stream_1 (stream, flags, "w"); | |
| 1016 } | |
| 1017 | |
| 1018 /* #### From reading the Unix 98 specification, it appears that if we | |
| 1019 want stdio_reader() to be completely correct, we should check for | |
| 1020 0 < val < size and if so, check to see if an error has occurred. | |
| 1021 If an error has occurred, but val is non-zero, we should go ahead | |
| 1022 and act as if the read was successful, but remember in some fashion | |
| 1023 or other, that an error has occurred, and report that on the next | |
| 771 | 1024 call to stdio_reader instead of calling retry_fread() again. |
| 428 | 1025 |
| 771 | 1026 Currently, in such a case, we end up calling retry_fread() twice and we |
| 428 | 1027 assume that |
| 1028 | |
| 1029 1) this is not harmful, and | |
| 1030 2) the error will still be reported on the second read. | |
| 1031 | |
| 1032 This is probably reasonable, so I don't think we should change this | |
| 1033 code (it could even be argued that the error might have fixed | |
| 771 | 1034 itself, so we should do the retry_fread() again. */ |
| 428 | 1035 |
| 665 | 1036 static Bytecount |
| 1037 stdio_reader (Lstream *stream, unsigned char *data, Bytecount size) | |
| 428 | 1038 { |
| 1039 struct stdio_stream *str = STDIO_STREAM_DATA (stream); | |
| 771 | 1040 Bytecount val = retry_fread (data, 1, size, str->file); |
| 1041 if (!val) | |
| 1042 { | |
| 1043 if (ferror (str->file)) | |
| 1044 return LSTREAM_ERROR; | |
| 1045 if (feof (str->file)) | |
| 1046 return 0; /* LSTREAM_EOF; */ | |
| 1047 } | |
| 428 | 1048 return val; |
| 1049 } | |
| 1050 | |
| 665 | 1051 static Bytecount |
| 462 | 1052 stdio_writer (Lstream *stream, const unsigned char *data, |
| 665 | 1053 Bytecount size) |
| 428 | 1054 { |
| 1055 struct stdio_stream *str = STDIO_STREAM_DATA (stream); | |
| 771 | 1056 Bytecount val = retry_fwrite (data, 1, size, str->file); |
| 428 | 1057 if (!val && ferror (str->file)) |
| 771 | 1058 return LSTREAM_ERROR; |
| 428 | 1059 return val; |
| 1060 } | |
| 1061 | |
| 1062 static int | |
| 1063 stdio_rewinder (Lstream *stream) | |
| 1064 { | |
| 1065 rewind (STDIO_STREAM_DATA (stream)->file); | |
| 1066 return 0; | |
| 1067 } | |
| 1068 | |
| 1069 static int | |
| 1070 stdio_seekable_p (Lstream *stream) | |
| 1071 { | |
| 1072 struct stat lestat; | |
| 1073 struct stdio_stream *str = STDIO_STREAM_DATA (stream); | |
| 1074 | |
| 771 | 1075 if (qxe_fstat (fileno (str->file), &lestat) < 0) |
| 428 | 1076 return 0; |
| 1077 return S_ISREG (lestat.st_mode); | |
| 1078 } | |
| 1079 | |
| 1080 static int | |
| 1081 stdio_flusher (Lstream *stream) | |
| 1082 { | |
| 1083 struct stdio_stream *str = STDIO_STREAM_DATA (stream); | |
| 1084 if (stream->flags & LSTREAM_FL_WRITE) | |
| 1085 return fflush (str->file); | |
| 1086 else | |
| 1087 return 0; | |
| 1088 } | |
| 1089 | |
| 1090 static int | |
| 1091 stdio_closer (Lstream *stream) | |
| 1092 { | |
| 1093 struct stdio_stream *str = STDIO_STREAM_DATA (stream); | |
| 1094 if (str->closing) | |
| 771 | 1095 return retry_fclose (str->file); |
| 428 | 1096 else |
| 1097 if (stream->flags & LSTREAM_FL_WRITE) | |
| 1098 return fflush (str->file); | |
| 1099 else | |
| 1100 return 0; | |
| 1101 } | |
| 1102 | |
| 1103 /*********** a file descriptor ***********/ | |
| 1104 | |
| 1105 struct filedesc_stream | |
| 1106 { | |
| 1107 int fd; | |
| 1108 int pty_max_bytes; | |
| 867 | 1109 Ibyte eof_char; |
| 428 | 1110 int starting_pos; |
| 1111 int current_pos; | |
| 1112 int end_pos; | |
| 1113 int chars_sans_newline; | |
| 1114 unsigned int closing :1; | |
| 1115 unsigned int allow_quit :1; | |
| 1116 unsigned int blocked_ok :1; | |
| 1117 unsigned int pty_flushing :1; | |
| 1118 unsigned int blocking_error_p :1; | |
| 1119 }; | |
| 1120 | |
| 1121 #define FILEDESC_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, filedesc) | |
| 1122 | |
| 771 | 1123 DEFINE_LSTREAM_IMPLEMENTATION ("filedesc", filedesc); |
| 428 | 1124 |
| 1125 /* Make a stream that reads from or writes to a file descriptor FILEDESC. | |
| 1126 OFFSET is the offset from the *current* file pointer that the reading | |
| 1127 should start at. COUNT is the number of bytes to be read (it is | |
| 1128 ignored when writing); -1 for unlimited. */ | |
| 1129 static Lisp_Object | |
| 1130 make_filedesc_stream_1 (int filedesc, int offset, int count, int flags, | |
| 442 | 1131 const char *mode) |
| 428 | 1132 { |
| 1133 Lstream *lstr = Lstream_new (lstream_filedesc, mode); | |
| 1134 struct filedesc_stream *fstr = FILEDESC_STREAM_DATA (lstr); | |
| 1135 fstr->fd = filedesc; | |
| 1136 fstr->closing = !!(flags & LSTR_CLOSING); | |
| 1137 fstr->allow_quit = !!(flags & LSTR_ALLOW_QUIT); | |
| 1138 fstr->blocked_ok = !!(flags & LSTR_BLOCKED_OK); | |
| 1139 fstr->pty_flushing = !!(flags & LSTR_PTY_FLUSHING); | |
| 1140 fstr->blocking_error_p = 0; | |
| 1141 fstr->chars_sans_newline = 0; | |
| 1142 fstr->starting_pos = lseek (filedesc, offset, SEEK_CUR); | |
| 1143 fstr->current_pos = max (fstr->starting_pos, 0); | |
| 1144 if (count < 0) | |
| 1145 fstr->end_pos = -1; | |
| 1146 else | |
| 1147 fstr->end_pos = fstr->starting_pos + count; | |
| 1148 lstr->flags |= LSTREAM_FL_CLOSE_AT_DISKSAVE; | |
| 793 | 1149 return wrap_lstream (lstr); |
| 428 | 1150 } |
| 1151 | |
| 814 | 1152 /* Flags: |
| 1153 | |
| 1154 LSTR_CLOSING | |
| 1155 If set, close the descriptor or FILE * when the stream is closed. | |
| 1156 | |
| 1157 LSTR_ALLOW_QUIT | |
| 1158 If set, allow quitting out of the actual I/O. | |
| 1159 | |
| 1160 LSTR_PTY_FLUSHING | |
| 1161 If set and filedesc_stream_set_pty_flushing() has been called | |
| 1162 on the stream, do not send more than pty_max_bytes on a single | |
| 1163 line without flushing the data out using the eof_char. | |
| 1164 | |
| 1165 LSTR_BLOCKED_OK | |
| 1166 If set, an EWOULDBLOCK error is not treated as an error but | |
| 1167 simply causes the write function to return 0 as the number | |
| 1168 of bytes written out. | |
| 1169 */ | |
| 1170 | |
| 428 | 1171 Lisp_Object |
| 1172 make_filedesc_input_stream (int filedesc, int offset, int count, int flags) | |
| 1173 { | |
| 1174 return make_filedesc_stream_1 (filedesc, offset, count, flags, "r"); | |
| 1175 } | |
| 1176 | |
| 1177 Lisp_Object | |
| 1178 make_filedesc_output_stream (int filedesc, int offset, int count, int flags) | |
| 1179 { | |
| 1180 return make_filedesc_stream_1 (filedesc, offset, count, flags, "w"); | |
| 1181 } | |
| 1182 | |
| 665 | 1183 static Bytecount |
| 1184 filedesc_reader (Lstream *stream, unsigned char *data, Bytecount size) | |
| 428 | 1185 { |
| 665 | 1186 Bytecount nread; |
| 428 | 1187 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); |
| 1188 if (str->end_pos >= 0) | |
| 665 | 1189 size = min (size, (Bytecount) (str->end_pos - str->current_pos)); |
| 430 | 1190 nread = str->allow_quit ? |
| 1191 read_allowing_quit (str->fd, data, size) : | |
| 771 | 1192 retry_read (str->fd, data, size); |
| 428 | 1193 if (nread > 0) |
| 1194 str->current_pos += nread; | |
| 771 | 1195 if (nread == 0) |
| 1196 return 0; /* LSTREAM_EOF; */ | |
| 1197 if (nread < 0) | |
| 1198 return LSTREAM_ERROR; | |
| 428 | 1199 return nread; |
| 1200 } | |
| 1201 | |
| 1202 static int | |
| 1203 errno_would_block_p (int val) | |
| 1204 { | |
| 1205 #ifdef EWOULDBLOCK | |
| 1206 if (val == EWOULDBLOCK) | |
| 1207 return 1; | |
| 1208 #endif | |
| 1209 #ifdef EAGAIN | |
| 1210 if (val == EAGAIN) | |
| 1211 return 1; | |
| 1212 #endif | |
| 1213 return 0; | |
| 1214 } | |
| 1215 | |
| 665 | 1216 static Bytecount |
| 462 | 1217 filedesc_writer (Lstream *stream, const unsigned char *data, |
| 665 | 1218 Bytecount size) |
| 428 | 1219 { |
| 1220 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 665 | 1221 Bytecount retval; |
| 428 | 1222 int need_newline = 0; |
| 1223 | |
| 1224 /* This function would be simple if it were not for the blasted | |
| 1225 PTY max-bytes stuff. Why the hell can't they just have written | |
| 1226 the PTY drivers right so this problem doesn't exist? | |
| 1227 | |
| 1228 Maybe all the PTY crap here should be moved into another stream | |
| 1229 that does nothing but periodically insert EOF's as necessary. */ | |
| 1230 if (str->pty_flushing) | |
| 1231 { | |
| 1232 /* To make life easy, only send out one line at the most. */ | |
| 442 | 1233 const unsigned char *ptr; |
| 428 | 1234 |
| 442 | 1235 ptr = (const unsigned char *) memchr (data, '\n', size); |
| 428 | 1236 if (ptr) |
| 1237 need_newline = 1; | |
| 1238 else | |
| 1239 ptr = data + size; | |
| 1240 if (ptr - data >= str->pty_max_bytes - str->chars_sans_newline) | |
| 1241 { | |
| 1242 ptr = data + str->pty_max_bytes - str->chars_sans_newline; | |
| 1243 need_newline = 0; | |
| 1244 } | |
| 1245 size = ptr - data; | |
| 1246 } | |
| 1247 | |
| 1248 /**** start of non-PTY-crap ****/ | |
| 1249 if (size > 0) | |
| 430 | 1250 retval = str->allow_quit ? |
| 1251 write_allowing_quit (str->fd, data, size) : | |
| 771 | 1252 retry_write (str->fd, data, size); |
| 428 | 1253 else |
| 1254 retval = 0; | |
| 1255 if (retval < 0 && errno_would_block_p (errno) && str->blocked_ok) | |
| 1256 { | |
| 1257 str->blocking_error_p = 1; | |
| 1258 return 0; | |
| 1259 } | |
| 1260 str->blocking_error_p = 0; | |
| 1261 if (retval < 0) | |
| 771 | 1262 return LSTREAM_ERROR; |
| 428 | 1263 /**** end non-PTY-crap ****/ |
| 1264 | |
| 1265 if (str->pty_flushing) | |
| 1266 { | |
| 1267 str->chars_sans_newline += retval; | |
| 1268 /* Note that a newline was not among the bytes written out. | |
| 1269 Add to the number of non-newline bytes written out, | |
| 1270 and flush with an EOF if necessary. Be careful to | |
| 1271 keep track of write errors as we go along and look | |
| 1272 out for EWOULDBLOCK. */ | |
| 1273 if (str->chars_sans_newline >= str->pty_max_bytes) | |
| 1274 { | |
| 665 | 1275 Bytecount retval2 = str->allow_quit ? |
| 430 | 1276 write_allowing_quit (str->fd, &str->eof_char, 1) : |
| 771 | 1277 retry_write (str->fd, &str->eof_char, 1); |
| 430 | 1278 |
| 428 | 1279 if (retval2 > 0) |
| 1280 str->chars_sans_newline = 0; | |
| 1281 else if (retval2 < 0) | |
| 1282 { | |
| 1283 /* Error writing the EOF char. If nothing got written, | |
| 1284 then treat this as an error -- either return an error | |
| 1285 condition or set the blocking-error flag. */ | |
| 1286 if (retval == 0) | |
| 1287 { | |
| 1288 if (errno_would_block_p (errno) && str->blocked_ok) | |
| 1289 { | |
| 1290 str->blocking_error_p = 1; | |
| 1291 return 0; | |
| 1292 } | |
| 1293 else | |
| 771 | 1294 return LSTREAM_ERROR; |
| 428 | 1295 } |
| 1296 else | |
| 1297 return retval; | |
| 1298 } | |
| 1299 } | |
| 1300 } | |
| 1301 | |
| 1302 /* The need_newline flag is necessary because otherwise when the | |
| 1303 first byte is a newline, we'd get stuck never writing anything | |
| 1304 in pty-flushing mode. */ | |
| 1305 if (need_newline) | |
| 1306 { | |
| 867 | 1307 Ibyte nl = '\n'; |
| 665 | 1308 Bytecount retval2 = str->allow_quit ? |
| 430 | 1309 write_allowing_quit (str->fd, &nl, 1) : |
| 771 | 1310 retry_write (str->fd, &nl, 1); |
| 430 | 1311 |
| 428 | 1312 if (retval2 > 0) |
| 1313 { | |
| 1314 str->chars_sans_newline = 0; | |
| 1315 retval++; | |
| 1316 } | |
| 1317 else if (retval2 < 0) | |
| 1318 { | |
| 1319 /* Error writing the newline char. If nothing got written, | |
| 1320 then treat this as an error -- either return an error | |
| 1321 condition or set the blocking-error flag. */ | |
| 1322 if (retval == 0) | |
| 1323 { | |
| 1324 if (errno_would_block_p (errno) && str->blocked_ok) | |
| 1325 { | |
| 1326 str->blocking_error_p = 1; | |
| 1327 return 0; | |
| 1328 } | |
| 1329 else | |
| 771 | 1330 return LSTREAM_ERROR; |
| 428 | 1331 } |
| 1332 else | |
| 1333 return retval; | |
| 1334 } | |
| 1335 } | |
| 1336 | |
| 1337 return retval; | |
| 1338 } | |
| 1339 | |
| 1340 static int | |
| 1341 filedesc_rewinder (Lstream *stream) | |
| 1342 { | |
| 1343 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1344 if (str->starting_pos < 0 || | |
| 1345 lseek (FILEDESC_STREAM_DATA (stream)->fd, str->starting_pos, | |
| 1346 SEEK_SET) == -1) | |
| 1347 return -1; | |
| 1348 else | |
| 1349 { | |
| 1350 str->current_pos = str->starting_pos; | |
| 1351 return 0; | |
| 1352 } | |
| 1353 } | |
| 1354 | |
| 1355 static int | |
| 1356 filedesc_seekable_p (Lstream *stream) | |
| 1357 { | |
| 1358 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1359 if (str->starting_pos < 0) | |
| 1360 return 0; | |
| 1361 else | |
| 1362 { | |
| 1363 struct stat lestat; | |
| 1364 | |
| 771 | 1365 if (qxe_fstat (str->fd, &lestat) < 0) |
| 428 | 1366 return 0; |
| 1367 return S_ISREG (lestat.st_mode); | |
| 1368 } | |
| 1369 } | |
| 1370 | |
| 1371 static int | |
| 1372 filedesc_closer (Lstream *stream) | |
| 1373 { | |
| 1374 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1375 if (str->closing) | |
| 771 | 1376 return retry_close (str->fd); |
| 428 | 1377 else |
| 1378 return 0; | |
| 1379 } | |
| 1380 | |
| 1381 static int | |
| 1382 filedesc_was_blocked_p (Lstream *stream) | |
| 1383 { | |
| 1384 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1385 return str->blocking_error_p; | |
| 1386 } | |
| 1387 | |
| 1388 void | |
| 1389 filedesc_stream_set_pty_flushing (Lstream *stream, int pty_max_bytes, | |
| 867 | 1390 Ibyte eof_char) |
| 428 | 1391 { |
| 1392 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1393 str->pty_max_bytes = pty_max_bytes; | |
| 1394 str->eof_char = eof_char; | |
| 1395 str->pty_flushing = 1; | |
| 1396 } | |
| 1397 | |
| 1398 int | |
| 1399 filedesc_stream_fd (Lstream *stream) | |
| 1400 { | |
| 1401 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream); | |
| 1402 return str->fd; | |
| 1403 } | |
| 1404 | |
| 1405 /*********** read from a Lisp string ***********/ | |
| 1406 | |
| 1407 #define LISP_STRING_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, lisp_string) | |
| 1408 | |
| 1409 struct lisp_string_stream | |
| 1410 { | |
| 1411 Lisp_Object obj; | |
| 1412 Bytecount init_offset; | |
| 1413 Bytecount offset, end; | |
| 1414 }; | |
| 1415 | |
| 1204 | 1416 static const struct memory_description lisp_string_lstream_description[] = { |
| 1417 { XD_LISP_OBJECT, offsetof (struct lisp_string_stream, obj) }, | |
| 1418 { XD_END } | |
| 1419 }; | |
| 1420 | |
| 1421 DEFINE_LSTREAM_IMPLEMENTATION_WITH_DATA ("lisp-string", lisp_string); | |
| 428 | 1422 |
| 1423 Lisp_Object | |
| 1424 make_lisp_string_input_stream (Lisp_Object string, Bytecount offset, | |
| 1425 Bytecount len) | |
| 1426 { | |
| 1427 Lstream *lstr; | |
| 1428 struct lisp_string_stream *str; | |
| 1429 | |
| 1430 CHECK_STRING (string); | |
| 1431 if (len < 0) | |
| 1432 len = XSTRING_LENGTH (string) - offset; | |
| 1433 assert (offset >= 0); | |
| 1434 assert (len >= 0); | |
| 1435 assert (offset + len <= XSTRING_LENGTH (string)); | |
| 1436 | |
| 1437 lstr = Lstream_new (lstream_lisp_string, "r"); | |
| 1438 str = LISP_STRING_STREAM_DATA (lstr); | |
| 1439 str->offset = offset; | |
| 1440 str->end = offset + len; | |
| 1441 str->init_offset = offset; | |
| 1442 str->obj = string; | |
| 793 | 1443 return wrap_lstream (lstr); |
| 428 | 1444 } |
| 1445 | |
| 665 | 1446 static Bytecount |
| 462 | 1447 lisp_string_reader (Lstream *stream, unsigned char *data, |
| 665 | 1448 Bytecount size) |
| 428 | 1449 { |
| 1450 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream); | |
| 1451 /* Don't lose if the string shrank past us ... */ | |
| 1452 Bytecount offset = min (str->offset, XSTRING_LENGTH (str->obj)); | |
| 867 | 1453 Ibyte *strstart = XSTRING_DATA (str->obj); |
| 1454 Ibyte *start = strstart + offset; | |
| 428 | 1455 |
| 1456 /* ... or if someone changed the string and we ended up in the | |
| 1457 middle of a character. */ | |
| 1458 /* Being in the middle of a character is `normal' unless | |
| 1459 LSTREAM_NO_PARTIAL_CHARS - mrb */ | |
| 1460 if (stream->flags & LSTREAM_FL_NO_PARTIAL_CHARS) | |
| 867 | 1461 VALIDATE_IBYTEPTR_BACKWARD (start); |
| 428 | 1462 offset = start - strstart; |
| 665 | 1463 size = min (size, (Bytecount) (str->end - offset)); |
| 428 | 1464 memcpy (data, start, size); |
| 1465 str->offset = offset + size; | |
| 1466 return size; | |
| 1467 } | |
| 1468 | |
| 1469 static int | |
| 1470 lisp_string_rewinder (Lstream *stream) | |
| 1471 { | |
| 1472 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream); | |
| 1473 int pos = str->init_offset; | |
| 1474 if (pos > str->end) | |
| 1475 pos = str->end; | |
| 1476 /* Don't lose if the string shrank past us ... */ | |
| 1477 pos = min (pos, XSTRING_LENGTH (str->obj)); | |
| 1478 /* ... or if someone changed the string and we ended up in the | |
| 1479 middle of a character. */ | |
| 1480 { | |
| 867 | 1481 Ibyte *strstart = XSTRING_DATA (str->obj); |
| 1482 Ibyte *start = strstart + pos; | |
| 1483 VALIDATE_IBYTEPTR_BACKWARD (start); | |
| 428 | 1484 pos = start - strstart; |
| 1485 } | |
| 1486 str->offset = pos; | |
| 1487 return 0; | |
| 1488 } | |
| 1489 | |
| 1490 static Lisp_Object | |
| 1491 lisp_string_marker (Lisp_Object stream) | |
| 1492 { | |
| 1493 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (XLSTREAM (stream)); | |
| 1494 return str->obj; | |
| 1495 } | |
| 1496 | |
| 1497 /*********** a fixed buffer ***********/ | |
| 1498 | |
| 1499 #define FIXED_BUFFER_STREAM_DATA(stream) \ | |
| 1500 LSTREAM_TYPE_DATA (stream, fixed_buffer) | |
| 1501 | |
| 1502 struct fixed_buffer_stream | |
| 1503 { | |
| 442 | 1504 const unsigned char *inbuf; |
| 428 | 1505 unsigned char *outbuf; |
| 665 | 1506 Bytecount size; |
| 1507 Bytecount offset; | |
| 428 | 1508 }; |
| 1509 | |
| 771 | 1510 DEFINE_LSTREAM_IMPLEMENTATION ("fixed-buffer", fixed_buffer); |
| 428 | 1511 |
| 1512 Lisp_Object | |
| 665 | 1513 make_fixed_buffer_input_stream (const void *buf, Bytecount size) |
| 428 | 1514 { |
| 1515 Lstream *lstr = Lstream_new (lstream_fixed_buffer, "r"); | |
| 1516 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (lstr); | |
| 440 | 1517 str->inbuf = (const unsigned char *) buf; |
| 428 | 1518 str->size = size; |
| 793 | 1519 return wrap_lstream (lstr); |
| 428 | 1520 } |
| 1521 | |
| 1522 Lisp_Object | |
| 665 | 1523 make_fixed_buffer_output_stream (void *buf, Bytecount size) |
| 428 | 1524 { |
| 1525 Lstream *lstr = Lstream_new (lstream_fixed_buffer, "w"); | |
| 1526 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (lstr); | |
| 440 | 1527 str->outbuf = (unsigned char *) buf; |
| 428 | 1528 str->size = size; |
| 793 | 1529 return wrap_lstream (lstr); |
| 428 | 1530 } |
| 1531 | |
| 665 | 1532 static Bytecount |
| 462 | 1533 fixed_buffer_reader (Lstream *stream, unsigned char *data, |
| 665 | 1534 Bytecount size) |
| 428 | 1535 { |
| 1536 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (stream); | |
| 1537 size = min (size, str->size - str->offset); | |
| 1538 memcpy (data, str->inbuf + str->offset, size); | |
| 1539 str->offset += size; | |
| 1540 return size; | |
| 1541 } | |
| 1542 | |
| 665 | 1543 static Bytecount |
| 462 | 1544 fixed_buffer_writer (Lstream *stream, const unsigned char *data, |
| 665 | 1545 Bytecount size) |
| 428 | 1546 { |
| 1547 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (stream); | |
| 1548 if (str->offset == str->size) | |
| 1549 { | |
| 1550 /* If we're at the end, just throw away the data and pretend | |
| 1551 we wrote all of it. If we return 0, then the lstream routines | |
| 1552 will try again and again to write it out. */ | |
| 1553 return size; | |
| 1554 } | |
| 1555 size = min (size, str->size - str->offset); | |
| 1556 memcpy (str->outbuf + str->offset, data, size); | |
| 1557 str->offset += size; | |
| 1558 return size; | |
| 1559 } | |
| 1560 | |
| 1561 static int | |
| 1562 fixed_buffer_rewinder (Lstream *stream) | |
| 1563 { | |
| 1564 FIXED_BUFFER_STREAM_DATA (stream)->offset = 0; | |
| 1565 return 0; | |
| 1566 } | |
| 1567 | |
| 442 | 1568 const unsigned char * |
| 428 | 1569 fixed_buffer_input_stream_ptr (Lstream *stream) |
| 1570 { | |
| 1571 assert (stream->imp == lstream_fixed_buffer); | |
| 1572 return FIXED_BUFFER_STREAM_DATA (stream)->inbuf; | |
| 1573 } | |
| 1574 | |
| 1575 unsigned char * | |
| 1576 fixed_buffer_output_stream_ptr (Lstream *stream) | |
| 1577 { | |
| 1578 assert (stream->imp == lstream_fixed_buffer); | |
| 1579 return FIXED_BUFFER_STREAM_DATA (stream)->outbuf; | |
| 1580 } | |
| 1581 | |
| 1582 /*********** write to a resizing buffer ***********/ | |
| 1583 | |
| 1584 #define RESIZING_BUFFER_STREAM_DATA(stream) \ | |
| 1585 LSTREAM_TYPE_DATA (stream, resizing_buffer) | |
| 1586 | |
| 1587 struct resizing_buffer_stream | |
| 1588 { | |
| 1589 unsigned char *buf; | |
| 665 | 1590 Bytecount allocked; |
| 428 | 1591 int max_stored; |
| 1592 int stored; | |
| 1593 }; | |
| 1594 | |
| 771 | 1595 DEFINE_LSTREAM_IMPLEMENTATION ("resizing-buffer", resizing_buffer); |
| 428 | 1596 |
| 1597 Lisp_Object | |
| 1598 make_resizing_buffer_output_stream (void) | |
| 1599 { | |
| 793 | 1600 return wrap_lstream (Lstream_new (lstream_resizing_buffer, "w")); |
| 428 | 1601 } |
| 1602 | |
| 665 | 1603 static Bytecount |
| 462 | 1604 resizing_buffer_writer (Lstream *stream, const unsigned char *data, |
| 665 | 1605 Bytecount size) |
| 428 | 1606 { |
| 1607 struct resizing_buffer_stream *str = RESIZING_BUFFER_STREAM_DATA (stream); | |
| 1608 DO_REALLOC (str->buf, str->allocked, str->stored + size, unsigned char); | |
| 1609 memcpy (str->buf + str->stored, data, size); | |
| 1610 str->stored += size; | |
| 1611 str->max_stored = max (str->max_stored, str->stored); | |
| 1612 return size; | |
| 1613 } | |
| 1614 | |
| 1615 static int | |
| 1616 resizing_buffer_rewinder (Lstream *stream) | |
| 1617 { | |
| 1618 RESIZING_BUFFER_STREAM_DATA (stream)->stored = 0; | |
| 1619 return 0; | |
| 1620 } | |
| 1621 | |
| 1622 static int | |
| 1623 resizing_buffer_closer (Lstream *stream) | |
| 1624 { | |
| 1625 struct resizing_buffer_stream *str = RESIZING_BUFFER_STREAM_DATA (stream); | |
| 1626 if (str->buf) | |
| 1627 { | |
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1628 xfree (str->buf); |
| 428 | 1629 str->buf = 0; |
| 1630 } | |
| 1631 return 0; | |
| 1632 } | |
| 1633 | |
| 1634 unsigned char * | |
| 1635 resizing_buffer_stream_ptr (Lstream *stream) | |
| 1636 { | |
| 1637 return RESIZING_BUFFER_STREAM_DATA (stream)->buf; | |
| 1638 } | |
| 1639 | |
| 788 | 1640 Lisp_Object |
| 1641 resizing_buffer_to_lisp_string (Lstream *stream) | |
| 1642 { | |
| 1643 return make_string (resizing_buffer_stream_ptr (stream), | |
| 1644 Lstream_byte_count (stream)); | |
| 1645 } | |
| 1646 | |
| 428 | 1647 /*********** write to an unsigned-char dynarr ***********/ |
| 1648 | |
| 1649 /* Note: If you have a dynarr whose type is not unsigned_char_dynarr | |
| 1650 but which is really just an unsigned_char_dynarr (e.g. its type | |
| 867 | 1651 is Ibyte or Extbyte), just cast to unsigned_char_dynarr. */ |
| 428 | 1652 |
| 1653 #define DYNARR_STREAM_DATA(stream) \ | |
| 1654 LSTREAM_TYPE_DATA (stream, dynarr) | |
| 1655 | |
| 1656 struct dynarr_stream | |
| 1657 { | |
| 1658 unsigned_char_dynarr *dyn; | |
| 1659 }; | |
| 1660 | |
| 771 | 1661 DEFINE_LSTREAM_IMPLEMENTATION ("dynarr", dynarr); |
| 428 | 1662 |
| 1663 Lisp_Object | |
| 1664 make_dynarr_output_stream (unsigned_char_dynarr *dyn) | |
| 1665 { | |
| 793 | 1666 Lisp_Object obj = wrap_lstream (Lstream_new (lstream_dynarr, "w")); |
| 1667 | |
| 428 | 1668 DYNARR_STREAM_DATA (XLSTREAM (obj))->dyn = dyn; |
| 1669 return obj; | |
| 1670 } | |
| 1671 | |
| 665 | 1672 static Bytecount |
| 462 | 1673 dynarr_writer (Lstream *stream, const unsigned char *data, |
| 665 | 1674 Bytecount size) |
| 428 | 1675 { |
| 1676 struct dynarr_stream *str = DYNARR_STREAM_DATA (stream); | |
| 1677 Dynarr_add_many (str->dyn, data, size); | |
| 1678 return size; | |
| 1679 } | |
| 1680 | |
| 1681 static int | |
| 1682 dynarr_rewinder (Lstream *stream) | |
| 1683 { | |
| 1684 Dynarr_reset (DYNARR_STREAM_DATA (stream)->dyn); | |
| 1685 return 0; | |
| 1686 } | |
| 1687 | |
| 1688 static int | |
| 2286 | 1689 dynarr_closer (Lstream *UNUSED (stream)) |
| 428 | 1690 { |
| 1691 return 0; | |
| 1692 } | |
| 1693 | |
| 1694 /************ read from or write to a Lisp buffer ************/ | |
| 1695 | |
| 1696 /* Note: Lisp-buffer read streams never return partial characters, | |
| 1697 and Lisp-buffer write streams expect to never get partial | |
| 1698 characters. */ | |
| 1699 | |
| 1700 #define LISP_BUFFER_STREAM_DATA(stream) \ | |
| 1701 LSTREAM_TYPE_DATA (stream, lisp_buffer) | |
| 1702 | |
| 1703 struct lisp_buffer_stream | |
| 1704 { | |
| 1705 Lisp_Object buffer; | |
| 1706 Lisp_Object orig_start; | |
| 1707 /* we use markers to properly deal with insertion/deletion */ | |
| 1708 Lisp_Object start, end; | |
| 1709 int flags; | |
| 1710 }; | |
| 1711 | |
| 1204 | 1712 static const struct memory_description lisp_buffer_lstream_description[] = { |
| 1713 { XD_LISP_OBJECT, offsetof (struct lisp_buffer_stream, buffer) }, | |
| 1714 { XD_LISP_OBJECT, offsetof (struct lisp_buffer_stream, orig_start) }, | |
| 1715 { XD_LISP_OBJECT, offsetof (struct lisp_buffer_stream, start) }, | |
| 1716 { XD_LISP_OBJECT, offsetof (struct lisp_buffer_stream, end) }, | |
| 1717 { XD_END } | |
| 1718 }; | |
| 1719 | |
| 1720 DEFINE_LSTREAM_IMPLEMENTATION_WITH_DATA ("lisp-buffer", lisp_buffer); | |
| 428 | 1721 |
| 1722 static Lisp_Object | |
| 665 | 1723 make_lisp_buffer_stream_1 (struct buffer *buf, Charbpos start, Charbpos end, |
| 2367 | 1724 int flags, const Ascbyte *mode) |
| 428 | 1725 { |
| 1726 Lstream *lstr; | |
| 1727 struct lisp_buffer_stream *str; | |
| 665 | 1728 Charbpos bmin, bmax; |
| 428 | 1729 int reading = !strcmp (mode, "r"); |
| 1730 | |
| 1731 /* Make sure the luser didn't pass "w" in. */ | |
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1732 assert (strcmp (mode, "w")); |
| 428 | 1733 |
| 1734 if (flags & LSTR_IGNORE_ACCESSIBLE) | |
| 1735 { | |
| 1736 bmin = BUF_BEG (buf); | |
| 1737 bmax = BUF_Z (buf); | |
| 1738 } | |
| 1739 else | |
| 1740 { | |
| 1741 bmin = BUF_BEGV (buf); | |
| 1742 bmax = BUF_ZV (buf); | |
| 1743 } | |
| 1744 | |
| 1745 if (start == -1) | |
| 1746 start = bmin; | |
| 1747 if (end == -1) | |
| 1748 end = bmax; | |
| 1749 assert (bmin <= start); | |
| 1750 assert (start <= bmax); | |
| 1751 if (reading) | |
| 1752 { | |
| 1753 assert (bmin <= end); | |
| 1754 assert (end <= bmax); | |
| 1755 assert (start <= end); | |
| 1756 } | |
| 1757 | |
| 1758 lstr = Lstream_new (lstream_lisp_buffer, mode); | |
| 1759 str = LISP_BUFFER_STREAM_DATA (lstr); | |
| 1760 { | |
| 1761 Lisp_Object marker; | |
| 793 | 1762 Lisp_Object buffer = wrap_buffer (buf); |
| 428 | 1763 |
| 1764 marker = Fmake_marker (); | |
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1765 Fset_marker (marker, make_fixnum (start), buffer); |
| 428 | 1766 str->start = marker; |
| 1767 marker = Fmake_marker (); | |
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1768 Fset_marker (marker, make_fixnum (start), buffer); |
| 428 | 1769 str->orig_start = marker; |
| 1770 if (reading) | |
| 1771 { | |
| 1772 marker = Fmake_marker (); | |
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1773 Fset_marker (marker, make_fixnum (end), buffer); |
| 428 | 1774 str->end = marker; |
| 1775 } | |
| 1776 else | |
| 1777 str->end = Qnil; | |
| 1778 str->buffer = buffer; | |
| 1779 } | |
| 1780 str->flags = flags; | |
| 793 | 1781 return wrap_lstream (lstr); |
| 428 | 1782 } |
| 1783 | |
| 1784 Lisp_Object | |
| 826 | 1785 make_lisp_buffer_input_stream (struct buffer *buf, Charbpos start, |
| 1786 Charbpos end, int flags) | |
| 428 | 1787 { |
| 1788 return make_lisp_buffer_stream_1 (buf, start, end, flags, "r"); | |
| 1789 } | |
| 1790 | |
| 1791 Lisp_Object | |
| 665 | 1792 make_lisp_buffer_output_stream (struct buffer *buf, Charbpos pos, int flags) |
| 428 | 1793 { |
| 1794 Lisp_Object lstr = make_lisp_buffer_stream_1 (buf, pos, 0, flags, "wc"); | |
| 1795 | |
| 1796 Lstream_set_character_mode (XLSTREAM (lstr)); | |
| 1797 return lstr; | |
| 1798 } | |
| 1799 | |
| 665 | 1800 static Bytecount |
| 867 | 1801 lisp_buffer_reader (Lstream *stream, Ibyte *data, Bytecount size) |
| 428 | 1802 { |
| 1803 struct lisp_buffer_stream *str = LISP_BUFFER_STREAM_DATA (stream); | |
| 665 | 1804 Bytebpos start; |
| 1805 Bytebpos end; | |
| 428 | 1806 struct buffer *buf = XBUFFER (str->buffer); |
| 826 | 1807 Bytecount src_used; |
| 428 | 1808 |
| 1809 if (!BUFFER_LIVE_P (buf)) | |
| 1810 return 0; /* Fut. */ | |
| 1811 | |
| 826 | 1812 start = byte_marker_position (str->start); |
| 1813 end = byte_marker_position (str->end); | |
| 428 | 1814 if (!(str->flags & LSTR_IGNORE_ACCESSIBLE)) |
| 1815 { | |
| 826 | 1816 start = bytebpos_clip_to_bounds (BYTE_BUF_BEGV (buf), start, |
| 1817 BYTE_BUF_ZV (buf)); | |
| 1818 end = bytebpos_clip_to_bounds (BYTE_BUF_BEGV (buf), end, | |
| 1819 BYTE_BUF_ZV (buf)); | |
| 428 | 1820 } |
| 1821 | |
| 826 | 1822 size = copy_buffer_text_out (buf, start, end - start, data, size, |
| 1823 FORMAT_DEFAULT, Qnil, &src_used); | |
| 1824 end = start + src_used; | |
| 428 | 1825 |
| 1826 if (EQ (buf->selective_display, Qt) && str->flags & LSTR_SELECTIVE) | |
| 1827 { | |
| 1828 /* What a kludge. What a kludge. What a kludge. */ | |
| 867 | 1829 Ibyte *p; |
| 840 | 1830 for (p = data; p < data + src_used; p++) |
| 428 | 1831 if (*p == '\r') |
| 1832 *p = '\n'; | |
| 1833 } | |
| 1834 | |
| 826 | 1835 set_byte_marker_position (str->start, end); |
| 1836 return size; | |
| 428 | 1837 } |
| 1838 | |
| 665 | 1839 static Bytecount |
| 867 | 1840 lisp_buffer_writer (Lstream *stream, const Ibyte *data, |
| 665 | 1841 Bytecount size) |
| 428 | 1842 { |
| 1843 struct lisp_buffer_stream *str = LISP_BUFFER_STREAM_DATA (stream); | |
| 665 | 1844 Charbpos pos; |
| 428 | 1845 struct buffer *buf = XBUFFER (str->buffer); |
| 1846 | |
| 1847 if (!BUFFER_LIVE_P (buf)) | |
| 1848 return 0; /* Fut. */ | |
| 1849 | |
| 1850 pos = marker_position (str->start); | |
| 1851 pos += buffer_insert_raw_string_1 (buf, pos, data, size, 0); | |
| 1852 set_marker_position (str->start, pos); | |
| 1853 return size; | |
| 1854 } | |
| 1855 | |
| 1856 static int | |
| 1857 lisp_buffer_rewinder (Lstream *stream) | |
| 1858 { | |
| 1859 struct lisp_buffer_stream *str = | |
| 1860 LISP_BUFFER_STREAM_DATA (stream); | |
| 1861 struct buffer *buf = XBUFFER (str->buffer); | |
| 1862 long pos = marker_position (str->orig_start); | |
| 1863 if (!BUFFER_LIVE_P (buf)) | |
| 1864 return -1; /* Fut. */ | |
| 1865 if (pos > BUF_ZV (buf)) | |
| 1866 pos = BUF_ZV (buf); | |
| 1867 if (pos < marker_position (str->orig_start)) | |
| 1868 pos = marker_position (str->orig_start); | |
| 1869 if (MARKERP (str->end) && pos > marker_position (str->end)) | |
| 1870 pos = marker_position (str->end); | |
| 1871 set_marker_position (str->start, pos); | |
| 1872 return 0; | |
| 1873 } | |
| 1874 | |
| 1875 static Lisp_Object | |
| 1876 lisp_buffer_marker (Lisp_Object stream) | |
| 1877 { | |
| 1878 struct lisp_buffer_stream *str = | |
| 1879 LISP_BUFFER_STREAM_DATA (XLSTREAM (stream)); | |
| 1880 | |
| 1204 | 1881 mark_object (str->orig_start); |
| 428 | 1882 mark_object (str->start); |
| 1883 mark_object (str->end); | |
| 1884 return str->buffer; | |
| 1885 } | |
| 1886 | |
| 665 | 1887 Charbpos |
| 428 | 1888 lisp_buffer_stream_startpos (Lstream *stream) |
| 1889 { | |
| 1890 return marker_position (LISP_BUFFER_STREAM_DATA (stream)->start); | |
| 1891 } | |
| 1892 | |
| 1893 | |
| 1894 /************************************************************************/ | |
| 1895 /* initialization */ | |
| 1896 /************************************************************************/ | |
| 1897 | |
| 1898 void | |
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1899 syms_of_lstream (void) |
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1900 { |
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1901 INIT_LISP_OBJECT (lstream); |
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1902 } |
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1903 |
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1904 void |
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1905 lstream_objects_create (void) |
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1906 { |
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1907 OBJECT_HAS_PREMETHOD (lstream, disksave); |
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1908 } |
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1909 |
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1910 void |
| 428 | 1911 lstream_type_create (void) |
| 1912 { | |
| 1913 LSTREAM_HAS_METHOD (stdio, reader); | |
| 1914 LSTREAM_HAS_METHOD (stdio, writer); | |
| 1915 LSTREAM_HAS_METHOD (stdio, rewinder); | |
| 1916 LSTREAM_HAS_METHOD (stdio, seekable_p); | |
| 1917 LSTREAM_HAS_METHOD (stdio, flusher); | |
| 1918 LSTREAM_HAS_METHOD (stdio, closer); | |
| 1919 | |
| 1920 LSTREAM_HAS_METHOD (filedesc, reader); | |
| 1921 LSTREAM_HAS_METHOD (filedesc, writer); | |
| 1922 LSTREAM_HAS_METHOD (filedesc, was_blocked_p); | |
| 1923 LSTREAM_HAS_METHOD (filedesc, rewinder); | |
| 1924 LSTREAM_HAS_METHOD (filedesc, seekable_p); | |
| 1925 LSTREAM_HAS_METHOD (filedesc, closer); | |
| 1926 | |
| 1927 LSTREAM_HAS_METHOD (lisp_string, reader); | |
| 1928 LSTREAM_HAS_METHOD (lisp_string, rewinder); | |
| 1929 LSTREAM_HAS_METHOD (lisp_string, marker); | |
| 1930 | |
| 1931 LSTREAM_HAS_METHOD (fixed_buffer, reader); | |
| 1932 LSTREAM_HAS_METHOD (fixed_buffer, writer); | |
| 1933 LSTREAM_HAS_METHOD (fixed_buffer, rewinder); | |
| 1934 | |
| 1935 LSTREAM_HAS_METHOD (resizing_buffer, writer); | |
| 1936 LSTREAM_HAS_METHOD (resizing_buffer, rewinder); | |
| 1937 LSTREAM_HAS_METHOD (resizing_buffer, closer); | |
| 1938 | |
| 1939 LSTREAM_HAS_METHOD (dynarr, writer); | |
| 1940 LSTREAM_HAS_METHOD (dynarr, rewinder); | |
| 1941 LSTREAM_HAS_METHOD (dynarr, closer); | |
| 1942 | |
| 1943 LSTREAM_HAS_METHOD (lisp_buffer, reader); | |
| 1944 LSTREAM_HAS_METHOD (lisp_buffer, writer); | |
| 1945 LSTREAM_HAS_METHOD (lisp_buffer, rewinder); | |
| 1946 LSTREAM_HAS_METHOD (lisp_buffer, marker); | |
| 1947 } | |
| 1948 | |
| 3263 | 1949 #ifndef NEW_GC |
| 428 | 1950 void |
| 1951 reinit_vars_of_lstream (void) | |
| 1952 { | |
| 1953 int i; | |
| 1954 | |
| 1955 for (i = 0; i < countof (Vlstream_free_list); i++) | |
| 1956 { | |
| 1957 Vlstream_free_list[i] = Qnil; | |
| 1958 staticpro_nodump (&Vlstream_free_list[i]); | |
| 1959 } | |
| 1960 } | |
| 3263 | 1961 #endif /* not NEW_GC */ |
| 428 | 1962 |
| 1963 void | |
| 1964 vars_of_lstream (void) | |
| 1965 { | |
| 1966 } |