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3fa88220 | 1 | /* Copyright (C) 2009, 2010 Free Software Foundation, Inc. |
1ee2c72e LC |
2 | * |
3 | * This library is free software; you can redistribute it and/or | |
53befeb7 NJ |
4 | * modify it under the terms of the GNU Lesser General Public License |
5 | * as published by the Free Software Foundation; either version 3 of | |
6 | * the License, or (at your option) any later version. | |
1ee2c72e | 7 | * |
53befeb7 NJ |
8 | * This library is distributed in the hope that it will be useful, but |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
1ee2c72e LC |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * Lesser General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU Lesser General Public | |
14 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
16 | * 02110-1301 USA | |
1ee2c72e LC |
17 | */ |
18 | ||
19 | #ifdef HAVE_CONFIG_H | |
20 | # include <config.h> | |
21 | #endif | |
22 | ||
23 | #ifdef HAVE_UNISTD_H | |
24 | # include <unistd.h> | |
25 | #endif | |
26 | ||
27 | #include <string.h> | |
28 | #include <stdio.h> | |
29 | #include <assert.h> | |
30 | ||
31 | #include "libguile/_scm.h" | |
32 | #include "libguile/bytevectors.h" | |
33 | #include "libguile/chars.h" | |
34 | #include "libguile/eval.h" | |
35 | #include "libguile/r6rs-ports.h" | |
36 | #include "libguile/strings.h" | |
37 | #include "libguile/validate.h" | |
38 | #include "libguile/values.h" | |
39 | #include "libguile/vectors.h" | |
40 | ||
41 | ||
42 | \f | |
43 | /* Unimplemented features. */ | |
44 | ||
45 | ||
46 | /* Transoders are currently not implemented since Guile 1.8 is not | |
47 | Unicode-capable. Thus, most of the code here assumes the use of the | |
48 | binary transcoder. */ | |
49 | static inline void | |
50 | transcoders_not_implemented (void) | |
51 | { | |
52 | fprintf (stderr, "%s: warning: transcoders not implemented\n", | |
53 | PACKAGE_NAME); | |
54 | } | |
55 | ||
56 | \f | |
57 | /* End-of-file object. */ | |
58 | ||
59 | SCM_DEFINE (scm_eof_object, "eof-object", 0, 0, 0, | |
60 | (void), | |
61 | "Return the end-of-file object.") | |
62 | #define FUNC_NAME s_scm_eof_object | |
63 | { | |
64 | return (SCM_EOF_VAL); | |
65 | } | |
66 | #undef FUNC_NAME | |
67 | ||
68 | \f | |
69 | /* Input ports. */ | |
70 | ||
71 | #ifndef MIN | |
72 | # define MIN(a,b) ((a) < (b) ? (a) : (b)) | |
73 | #endif | |
74 | ||
75 | /* Bytevector input ports or "bip" for short. */ | |
76 | static scm_t_bits bytevector_input_port_type = 0; | |
77 | ||
78 | static inline SCM | |
79 | make_bip (SCM bv) | |
80 | { | |
81 | SCM port; | |
82 | char *c_bv; | |
83 | unsigned c_len; | |
84 | scm_t_port *c_port; | |
85 | const unsigned long mode_bits = SCM_OPN | SCM_RDNG; | |
86 | ||
a653d32a AR |
87 | scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex); |
88 | ||
1ee2c72e LC |
89 | port = scm_new_port_table_entry (bytevector_input_port_type); |
90 | ||
91 | /* Prevent BV from being GC'd. */ | |
92 | SCM_SETSTREAM (port, SCM_UNPACK (bv)); | |
93 | ||
94 | /* Have the port directly access the bytevector. */ | |
95 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
96 | c_len = SCM_BYTEVECTOR_LENGTH (bv); | |
97 | ||
98 | c_port = SCM_PTAB_ENTRY (port); | |
99 | c_port->read_pos = c_port->read_buf = (unsigned char *) c_bv; | |
100 | c_port->read_end = (unsigned char *) c_bv + c_len; | |
101 | c_port->read_buf_size = c_len; | |
102 | ||
103 | /* Mark PORT as open, readable and unbuffered (hmm, how elegant...). */ | |
104 | SCM_SET_CELL_TYPE (port, bytevector_input_port_type | mode_bits); | |
105 | ||
a653d32a AR |
106 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
107 | ||
1ee2c72e LC |
108 | return port; |
109 | } | |
110 | ||
1ee2c72e LC |
111 | static int |
112 | bip_fill_input (SCM port) | |
113 | { | |
114 | int result; | |
115 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); | |
116 | ||
117 | if (c_port->read_pos >= c_port->read_end) | |
118 | result = EOF; | |
119 | else | |
120 | result = (int) *c_port->read_pos; | |
121 | ||
122 | return result; | |
123 | } | |
124 | ||
f1ce9199 LC |
125 | static scm_t_off |
126 | bip_seek (SCM port, scm_t_off offset, int whence) | |
1ee2c72e LC |
127 | #define FUNC_NAME "bip_seek" |
128 | { | |
f1ce9199 | 129 | scm_t_off c_result = 0; |
1ee2c72e LC |
130 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); |
131 | ||
132 | switch (whence) | |
133 | { | |
134 | case SEEK_CUR: | |
135 | offset += c_port->read_pos - c_port->read_buf; | |
136 | /* Fall through. */ | |
137 | ||
138 | case SEEK_SET: | |
139 | if (c_port->read_buf + offset < c_port->read_end) | |
140 | { | |
141 | c_port->read_pos = c_port->read_buf + offset; | |
142 | c_result = offset; | |
143 | } | |
144 | else | |
145 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); | |
146 | break; | |
147 | ||
148 | case SEEK_END: | |
149 | if (c_port->read_end - offset >= c_port->read_buf) | |
150 | { | |
151 | c_port->read_pos = c_port->read_end - offset; | |
152 | c_result = c_port->read_pos - c_port->read_buf; | |
153 | } | |
154 | else | |
155 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); | |
156 | break; | |
157 | ||
158 | default: | |
159 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
160 | "invalid `seek' parameter"); | |
161 | } | |
162 | ||
163 | return c_result; | |
164 | } | |
165 | #undef FUNC_NAME | |
166 | ||
167 | ||
168 | /* Instantiate the bytevector input port type. */ | |
169 | static inline void | |
170 | initialize_bytevector_input_ports (void) | |
171 | { | |
172 | bytevector_input_port_type = | |
173 | scm_make_port_type ("r6rs-bytevector-input-port", bip_fill_input, | |
174 | NULL); | |
175 | ||
1ee2c72e LC |
176 | scm_set_port_seek (bytevector_input_port_type, bip_seek); |
177 | } | |
178 | ||
179 | ||
180 | SCM_DEFINE (scm_open_bytevector_input_port, | |
181 | "open-bytevector-input-port", 1, 1, 0, | |
182 | (SCM bv, SCM transcoder), | |
183 | "Return an input port whose contents are drawn from " | |
184 | "bytevector @var{bv}.") | |
185 | #define FUNC_NAME s_scm_open_bytevector_input_port | |
186 | { | |
187 | SCM_VALIDATE_BYTEVECTOR (1, bv); | |
188 | if (!SCM_UNBNDP (transcoder) && !scm_is_false (transcoder)) | |
189 | transcoders_not_implemented (); | |
190 | ||
191 | return (make_bip (bv)); | |
192 | } | |
193 | #undef FUNC_NAME | |
194 | ||
195 | \f | |
196 | /* Custom binary ports. The following routines are shared by input and | |
197 | output custom binary ports. */ | |
198 | ||
199 | #define SCM_CBP_GET_POSITION_PROC(_port) \ | |
200 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 1) | |
201 | #define SCM_CBP_SET_POSITION_PROC(_port) \ | |
202 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 2) | |
203 | #define SCM_CBP_CLOSE_PROC(_port) \ | |
204 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 3) | |
205 | ||
f1ce9199 LC |
206 | static scm_t_off |
207 | cbp_seek (SCM port, scm_t_off offset, int whence) | |
1ee2c72e LC |
208 | #define FUNC_NAME "cbp_seek" |
209 | { | |
210 | SCM result; | |
f1ce9199 | 211 | scm_t_off c_result = 0; |
1ee2c72e LC |
212 | |
213 | switch (whence) | |
214 | { | |
215 | case SEEK_CUR: | |
216 | { | |
217 | SCM get_position_proc; | |
218 | ||
219 | get_position_proc = SCM_CBP_GET_POSITION_PROC (port); | |
220 | if (SCM_LIKELY (scm_is_true (get_position_proc))) | |
221 | result = scm_call_0 (get_position_proc); | |
222 | else | |
223 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
224 | "R6RS custom binary port does not " | |
225 | "support `port-position'"); | |
226 | ||
227 | offset += scm_to_int (result); | |
228 | /* Fall through. */ | |
229 | } | |
230 | ||
231 | case SEEK_SET: | |
232 | { | |
233 | SCM set_position_proc; | |
234 | ||
235 | set_position_proc = SCM_CBP_SET_POSITION_PROC (port); | |
236 | if (SCM_LIKELY (scm_is_true (set_position_proc))) | |
237 | result = scm_call_1 (set_position_proc, scm_from_int (offset)); | |
238 | else | |
239 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
240 | "R6RS custom binary port does not " | |
241 | "support `set-port-position!'"); | |
242 | ||
243 | /* Assuming setting the position succeeded. */ | |
244 | c_result = offset; | |
245 | break; | |
246 | } | |
247 | ||
248 | default: | |
249 | /* `SEEK_END' cannot be supported. */ | |
250 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
251 | "R6RS custom binary ports do not " | |
252 | "support `SEEK_END'"); | |
253 | } | |
254 | ||
255 | return c_result; | |
256 | } | |
257 | #undef FUNC_NAME | |
258 | ||
259 | static int | |
260 | cbp_close (SCM port) | |
261 | { | |
262 | SCM close_proc; | |
263 | ||
264 | close_proc = SCM_CBP_CLOSE_PROC (port); | |
265 | if (scm_is_true (close_proc)) | |
266 | /* Invoke the `close' thunk. */ | |
267 | scm_call_0 (close_proc); | |
268 | ||
269 | return 1; | |
270 | } | |
271 | ||
272 | \f | |
273 | /* Custom binary input port ("cbip" for short). */ | |
274 | ||
275 | static scm_t_bits custom_binary_input_port_type = 0; | |
276 | ||
277 | /* Size of the buffer embedded in custom binary input ports. */ | |
278 | #define CBIP_BUFFER_SIZE 4096 | |
279 | ||
280 | /* Return the bytevector associated with PORT. */ | |
281 | #define SCM_CBIP_BYTEVECTOR(_port) \ | |
282 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 4) | |
283 | ||
284 | /* Return the various procedures of PORT. */ | |
285 | #define SCM_CBIP_READ_PROC(_port) \ | |
286 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 0) | |
287 | ||
288 | ||
289 | static inline SCM | |
290 | make_cbip (SCM read_proc, SCM get_position_proc, | |
291 | SCM set_position_proc, SCM close_proc) | |
292 | { | |
293 | SCM port, bv, method_vector; | |
294 | char *c_bv; | |
295 | unsigned c_len; | |
296 | scm_t_port *c_port; | |
297 | const unsigned long mode_bits = SCM_OPN | SCM_RDNG; | |
298 | ||
299 | /* Use a bytevector as the underlying buffer. */ | |
300 | c_len = CBIP_BUFFER_SIZE; | |
301 | bv = scm_c_make_bytevector (c_len); | |
302 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
303 | ||
304 | /* Store the various methods and bytevector in a vector. */ | |
305 | method_vector = scm_c_make_vector (5, SCM_BOOL_F); | |
306 | SCM_SIMPLE_VECTOR_SET (method_vector, 4, bv); | |
307 | SCM_SIMPLE_VECTOR_SET (method_vector, 0, read_proc); | |
308 | SCM_SIMPLE_VECTOR_SET (method_vector, 1, get_position_proc); | |
309 | SCM_SIMPLE_VECTOR_SET (method_vector, 2, set_position_proc); | |
310 | SCM_SIMPLE_VECTOR_SET (method_vector, 3, close_proc); | |
311 | ||
a653d32a AR |
312 | scm_i_pthread_mutex_lock (&scm_i_port_table_mutex); |
313 | ||
1ee2c72e LC |
314 | port = scm_new_port_table_entry (custom_binary_input_port_type); |
315 | ||
316 | /* Attach it the method vector. */ | |
317 | SCM_SETSTREAM (port, SCM_UNPACK (method_vector)); | |
318 | ||
319 | /* Have the port directly access the buffer (bytevector). */ | |
320 | c_port = SCM_PTAB_ENTRY (port); | |
321 | c_port->read_pos = c_port->read_buf = (unsigned char *) c_bv; | |
322 | c_port->read_end = (unsigned char *) c_bv; | |
323 | c_port->read_buf_size = c_len; | |
324 | ||
325 | /* Mark PORT as open, readable and unbuffered (hmm, how elegant...). */ | |
326 | SCM_SET_CELL_TYPE (port, custom_binary_input_port_type | mode_bits); | |
327 | ||
a653d32a AR |
328 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
329 | ||
1ee2c72e LC |
330 | return port; |
331 | } | |
332 | ||
333 | static int | |
334 | cbip_fill_input (SCM port) | |
335 | #define FUNC_NAME "cbip_fill_input" | |
336 | { | |
337 | int result; | |
338 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); | |
339 | ||
340 | again: | |
341 | if (c_port->read_pos >= c_port->read_end) | |
342 | { | |
343 | /* Invoke the user's `read!' procedure. */ | |
344 | unsigned c_octets; | |
345 | SCM bv, read_proc, octets; | |
346 | ||
347 | /* Use the bytevector associated with PORT as the buffer passed to the | |
348 | `read!' procedure, thereby avoiding additional allocations. */ | |
349 | bv = SCM_CBIP_BYTEVECTOR (port); | |
350 | read_proc = SCM_CBIP_READ_PROC (port); | |
351 | ||
352 | /* The assumption here is that C_PORT's internal buffer wasn't changed | |
353 | behind our back. */ | |
354 | assert (c_port->read_buf == | |
355 | (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv)); | |
356 | assert ((unsigned) c_port->read_buf_size | |
357 | == SCM_BYTEVECTOR_LENGTH (bv)); | |
358 | ||
359 | octets = scm_call_3 (read_proc, bv, SCM_INUM0, | |
360 | SCM_I_MAKINUM (CBIP_BUFFER_SIZE)); | |
361 | c_octets = scm_to_uint (octets); | |
362 | ||
363 | c_port->read_pos = (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
364 | c_port->read_end = (unsigned char *) c_port->read_pos + c_octets; | |
365 | ||
366 | if (c_octets > 0) | |
367 | goto again; | |
368 | else | |
369 | result = EOF; | |
370 | } | |
371 | else | |
372 | result = (int) *c_port->read_pos; | |
373 | ||
374 | return result; | |
375 | } | |
376 | #undef FUNC_NAME | |
377 | ||
378 | ||
379 | SCM_DEFINE (scm_make_custom_binary_input_port, | |
380 | "make-custom-binary-input-port", 5, 0, 0, | |
381 | (SCM id, SCM read_proc, SCM get_position_proc, | |
382 | SCM set_position_proc, SCM close_proc), | |
383 | "Return a new custom binary input port whose input is drained " | |
384 | "by invoking @var{read_proc} and passing it a bytevector, an " | |
385 | "index where octets should be written, and an octet count.") | |
386 | #define FUNC_NAME s_scm_make_custom_binary_input_port | |
387 | { | |
388 | SCM_VALIDATE_STRING (1, id); | |
389 | SCM_VALIDATE_PROC (2, read_proc); | |
390 | ||
391 | if (!scm_is_false (get_position_proc)) | |
392 | SCM_VALIDATE_PROC (3, get_position_proc); | |
393 | ||
394 | if (!scm_is_false (set_position_proc)) | |
395 | SCM_VALIDATE_PROC (4, set_position_proc); | |
396 | ||
397 | if (!scm_is_false (close_proc)) | |
398 | SCM_VALIDATE_PROC (5, close_proc); | |
399 | ||
400 | return (make_cbip (read_proc, get_position_proc, set_position_proc, | |
401 | close_proc)); | |
402 | } | |
403 | #undef FUNC_NAME | |
404 | ||
405 | ||
406 | /* Instantiate the custom binary input port type. */ | |
407 | static inline void | |
408 | initialize_custom_binary_input_ports (void) | |
409 | { | |
410 | custom_binary_input_port_type = | |
411 | scm_make_port_type ("r6rs-custom-binary-input-port", | |
412 | cbip_fill_input, NULL); | |
413 | ||
1ee2c72e LC |
414 | scm_set_port_seek (custom_binary_input_port_type, cbp_seek); |
415 | scm_set_port_close (custom_binary_input_port_type, cbp_close); | |
416 | } | |
417 | ||
418 | ||
419 | \f | |
420 | /* Binary input. */ | |
421 | ||
422 | /* We currently don't support specific binary input ports. */ | |
423 | #define SCM_VALIDATE_BINARY_INPUT_PORT SCM_VALIDATE_OPINPORT | |
424 | ||
425 | SCM_DEFINE (scm_get_u8, "get-u8", 1, 0, 0, | |
426 | (SCM port), | |
427 | "Read an octet from @var{port}, a binary input port, " | |
428 | "blocking as necessary.") | |
429 | #define FUNC_NAME s_scm_get_u8 | |
430 | { | |
431 | SCM result; | |
432 | int c_result; | |
433 | ||
434 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
435 | ||
436 | c_result = scm_getc (port); | |
437 | if (c_result == EOF) | |
438 | result = SCM_EOF_VAL; | |
439 | else | |
440 | result = SCM_I_MAKINUM ((unsigned char) c_result); | |
441 | ||
442 | return result; | |
443 | } | |
444 | #undef FUNC_NAME | |
445 | ||
446 | SCM_DEFINE (scm_lookahead_u8, "lookahead-u8", 1, 0, 0, | |
447 | (SCM port), | |
448 | "Like @code{get-u8} but does not update @var{port} to " | |
449 | "point past the octet.") | |
450 | #define FUNC_NAME s_scm_lookahead_u8 | |
451 | { | |
452 | SCM result; | |
453 | ||
454 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
455 | ||
456 | result = scm_peek_char (port); | |
457 | if (SCM_CHARP (result)) | |
3fa88220 | 458 | result = SCM_I_MAKINUM ((unsigned char) SCM_CHAR (result)); |
1ee2c72e LC |
459 | else |
460 | result = SCM_EOF_VAL; | |
461 | ||
462 | return result; | |
463 | } | |
464 | #undef FUNC_NAME | |
465 | ||
466 | SCM_DEFINE (scm_get_bytevector_n, "get-bytevector-n", 2, 0, 0, | |
467 | (SCM port, SCM count), | |
468 | "Read @var{count} octets from @var{port}, blocking as " | |
469 | "necessary and return a bytevector containing the octets " | |
470 | "read. If fewer bytes are available, a bytevector smaller " | |
471 | "than @var{count} is returned.") | |
472 | #define FUNC_NAME s_scm_get_bytevector_n | |
473 | { | |
474 | SCM result; | |
475 | char *c_bv; | |
476 | unsigned c_count; | |
477 | size_t c_read; | |
478 | ||
479 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
480 | c_count = scm_to_uint (count); | |
481 | ||
482 | result = scm_c_make_bytevector (c_count); | |
483 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (result); | |
484 | ||
485 | if (SCM_LIKELY (c_count > 0)) | |
486 | /* XXX: `scm_c_read ()' does not update the port position. */ | |
487 | c_read = scm_c_read (port, c_bv, c_count); | |
488 | else | |
489 | /* Don't invoke `scm_c_read ()' since it may block. */ | |
490 | c_read = 0; | |
491 | ||
492 | if ((c_read == 0) && (c_count > 0)) | |
493 | { | |
494 | if (SCM_EOF_OBJECT_P (scm_peek_char (port))) | |
495 | result = SCM_EOF_VAL; | |
496 | else | |
497 | result = scm_null_bytevector; | |
498 | } | |
499 | else | |
500 | { | |
501 | if (c_read < c_count) | |
502 | result = scm_c_shrink_bytevector (result, c_read); | |
503 | } | |
504 | ||
505 | return result; | |
506 | } | |
507 | #undef FUNC_NAME | |
508 | ||
509 | SCM_DEFINE (scm_get_bytevector_n_x, "get-bytevector-n!", 4, 0, 0, | |
510 | (SCM port, SCM bv, SCM start, SCM count), | |
511 | "Read @var{count} bytes from @var{port} and store them " | |
512 | "in @var{bv} starting at index @var{start}. Return either " | |
513 | "the number of bytes actually read or the end-of-file " | |
514 | "object.") | |
515 | #define FUNC_NAME s_scm_get_bytevector_n_x | |
516 | { | |
517 | SCM result; | |
518 | char *c_bv; | |
519 | unsigned c_start, c_count, c_len; | |
520 | size_t c_read; | |
521 | ||
522 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
523 | SCM_VALIDATE_BYTEVECTOR (2, bv); | |
524 | c_start = scm_to_uint (start); | |
525 | c_count = scm_to_uint (count); | |
526 | ||
527 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
528 | c_len = SCM_BYTEVECTOR_LENGTH (bv); | |
529 | ||
530 | if (SCM_UNLIKELY (c_start + c_count > c_len)) | |
531 | scm_out_of_range (FUNC_NAME, count); | |
532 | ||
533 | if (SCM_LIKELY (c_count > 0)) | |
534 | c_read = scm_c_read (port, c_bv + c_start, c_count); | |
535 | else | |
536 | /* Don't invoke `scm_c_read ()' since it may block. */ | |
537 | c_read = 0; | |
538 | ||
539 | if ((c_read == 0) && (c_count > 0)) | |
540 | { | |
541 | if (SCM_EOF_OBJECT_P (scm_peek_char (port))) | |
542 | result = SCM_EOF_VAL; | |
543 | else | |
544 | result = SCM_I_MAKINUM (0); | |
545 | } | |
546 | else | |
547 | result = scm_from_size_t (c_read); | |
548 | ||
549 | return result; | |
550 | } | |
551 | #undef FUNC_NAME | |
552 | ||
553 | ||
554 | SCM_DEFINE (scm_get_bytevector_some, "get-bytevector-some", 1, 0, 0, | |
555 | (SCM port), | |
556 | "Read from @var{port}, blocking as necessary, until data " | |
557 | "are available or and end-of-file is reached. Return either " | |
558 | "a new bytevector containing the data read or the " | |
559 | "end-of-file object.") | |
560 | #define FUNC_NAME s_scm_get_bytevector_some | |
561 | { | |
562 | /* Read at least one byte, unless the end-of-file is already reached, and | |
563 | read while characters are available (buffered). */ | |
564 | ||
565 | SCM result; | |
566 | char *c_bv; | |
567 | unsigned c_len; | |
568 | size_t c_total; | |
569 | ||
570 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
571 | ||
572 | c_len = 4096; | |
05762e72 | 573 | c_bv = (char *) scm_gc_malloc_pointerless (c_len, SCM_GC_BYTEVECTOR); |
1ee2c72e LC |
574 | c_total = 0; |
575 | ||
576 | do | |
577 | { | |
578 | int c_chr; | |
579 | ||
580 | if (c_total + 1 > c_len) | |
581 | { | |
582 | /* Grow the bytevector. */ | |
583 | c_bv = (char *) scm_gc_realloc (c_bv, c_len, c_len * 2, | |
584 | SCM_GC_BYTEVECTOR); | |
585 | c_len *= 2; | |
586 | } | |
587 | ||
588 | /* We can't use `scm_c_read ()' since it blocks. */ | |
589 | c_chr = scm_getc (port); | |
590 | if (c_chr != EOF) | |
591 | { | |
592 | c_bv[c_total] = (char) c_chr; | |
593 | c_total++; | |
594 | } | |
595 | } | |
596 | while ((scm_is_true (scm_char_ready_p (port))) | |
597 | && (!SCM_EOF_OBJECT_P (scm_peek_char (port)))); | |
598 | ||
599 | if (c_total == 0) | |
600 | { | |
601 | result = SCM_EOF_VAL; | |
602 | scm_gc_free (c_bv, c_len, SCM_GC_BYTEVECTOR); | |
603 | } | |
604 | else | |
605 | { | |
606 | if (c_len > c_total) | |
607 | { | |
608 | /* Shrink the bytevector. */ | |
609 | c_bv = (char *) scm_gc_realloc (c_bv, c_len, c_total, | |
610 | SCM_GC_BYTEVECTOR); | |
611 | c_len = (unsigned) c_total; | |
612 | } | |
613 | ||
614 | result = scm_c_take_bytevector ((signed char *) c_bv, c_len); | |
615 | } | |
616 | ||
617 | return result; | |
618 | } | |
619 | #undef FUNC_NAME | |
620 | ||
621 | SCM_DEFINE (scm_get_bytevector_all, "get-bytevector-all", 1, 0, 0, | |
622 | (SCM port), | |
623 | "Read from @var{port}, blocking as necessary, until " | |
624 | "the end-of-file is reached. Return either " | |
625 | "a new bytevector containing the data read or the " | |
626 | "end-of-file object (if no data were available).") | |
627 | #define FUNC_NAME s_scm_get_bytevector_all | |
628 | { | |
629 | SCM result; | |
630 | char *c_bv; | |
631 | unsigned c_len, c_count; | |
632 | size_t c_read, c_total; | |
633 | ||
634 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
635 | ||
636 | c_len = c_count = 4096; | |
05762e72 | 637 | c_bv = (char *) scm_gc_malloc_pointerless (c_len, SCM_GC_BYTEVECTOR); |
1ee2c72e LC |
638 | c_total = c_read = 0; |
639 | ||
640 | do | |
641 | { | |
642 | if (c_total + c_read > c_len) | |
643 | { | |
644 | /* Grow the bytevector. */ | |
645 | c_bv = (char *) scm_gc_realloc (c_bv, c_len, c_len * 2, | |
646 | SCM_GC_BYTEVECTOR); | |
647 | c_count = c_len; | |
648 | c_len *= 2; | |
649 | } | |
650 | ||
651 | /* `scm_c_read ()' blocks until C_COUNT bytes are available or EOF is | |
652 | reached. */ | |
653 | c_read = scm_c_read (port, c_bv + c_total, c_count); | |
654 | c_total += c_read, c_count -= c_read; | |
655 | } | |
656 | while (!SCM_EOF_OBJECT_P (scm_peek_char (port))); | |
657 | ||
658 | if (c_total == 0) | |
659 | { | |
660 | result = SCM_EOF_VAL; | |
661 | scm_gc_free (c_bv, c_len, SCM_GC_BYTEVECTOR); | |
662 | } | |
663 | else | |
664 | { | |
665 | if (c_len > c_total) | |
666 | { | |
667 | /* Shrink the bytevector. */ | |
668 | c_bv = (char *) scm_gc_realloc (c_bv, c_len, c_total, | |
669 | SCM_GC_BYTEVECTOR); | |
670 | c_len = (unsigned) c_total; | |
671 | } | |
672 | ||
673 | result = scm_c_take_bytevector ((signed char *) c_bv, c_len); | |
674 | } | |
675 | ||
676 | return result; | |
677 | } | |
678 | #undef FUNC_NAME | |
679 | ||
680 | ||
681 | \f | |
682 | /* Binary output. */ | |
683 | ||
684 | /* We currently don't support specific binary input ports. */ | |
685 | #define SCM_VALIDATE_BINARY_OUTPUT_PORT SCM_VALIDATE_OPOUTPORT | |
686 | ||
687 | ||
688 | SCM_DEFINE (scm_put_u8, "put-u8", 2, 0, 0, | |
689 | (SCM port, SCM octet), | |
690 | "Write @var{octet} to binary port @var{port}.") | |
691 | #define FUNC_NAME s_scm_put_u8 | |
692 | { | |
693 | scm_t_uint8 c_octet; | |
694 | ||
695 | SCM_VALIDATE_BINARY_OUTPUT_PORT (1, port); | |
696 | c_octet = scm_to_uint8 (octet); | |
697 | ||
698 | scm_putc ((char) c_octet, port); | |
699 | ||
700 | return SCM_UNSPECIFIED; | |
701 | } | |
702 | #undef FUNC_NAME | |
703 | ||
704 | SCM_DEFINE (scm_put_bytevector, "put-bytevector", 2, 2, 0, | |
705 | (SCM port, SCM bv, SCM start, SCM count), | |
706 | "Write the contents of @var{bv} to @var{port}, optionally " | |
707 | "starting at index @var{start} and limiting to @var{count} " | |
708 | "octets.") | |
709 | #define FUNC_NAME s_scm_put_bytevector | |
710 | { | |
711 | char *c_bv; | |
712 | unsigned c_start, c_count, c_len; | |
713 | ||
714 | SCM_VALIDATE_BINARY_OUTPUT_PORT (1, port); | |
715 | SCM_VALIDATE_BYTEVECTOR (2, bv); | |
716 | ||
717 | c_len = SCM_BYTEVECTOR_LENGTH (bv); | |
718 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
719 | ||
720 | if (start != SCM_UNDEFINED) | |
721 | { | |
722 | c_start = scm_to_uint (start); | |
723 | ||
724 | if (count != SCM_UNDEFINED) | |
725 | { | |
726 | c_count = scm_to_uint (count); | |
727 | if (SCM_UNLIKELY (c_start + c_count > c_len)) | |
728 | scm_out_of_range (FUNC_NAME, count); | |
729 | } | |
730 | else | |
731 | { | |
732 | if (SCM_UNLIKELY (c_start >= c_len)) | |
733 | scm_out_of_range (FUNC_NAME, start); | |
734 | else | |
735 | c_count = c_len - c_start; | |
736 | } | |
737 | } | |
738 | else | |
739 | c_start = 0, c_count = c_len; | |
740 | ||
741 | scm_c_write (port, c_bv + c_start, c_count); | |
742 | ||
743 | return SCM_UNSPECIFIED; | |
744 | } | |
745 | #undef FUNC_NAME | |
746 | ||
747 | ||
748 | \f | |
749 | /* Bytevector output port ("bop" for short). */ | |
750 | ||
751 | /* Implementation of "bops". | |
752 | ||
753 | Each bop has an internal buffer, of type `scm_t_bop_buffer', attached to | |
754 | it. The procedure returned along with the output port is actually an | |
755 | applicable SMOB. The SMOB holds a reference to the port. When applied, | |
756 | the SMOB swallows the port's internal buffer, turning it into a | |
757 | bytevector, and resets it. | |
758 | ||
759 | XXX: Access to a bop's internal buffer is not thread-safe. */ | |
760 | ||
761 | static scm_t_bits bytevector_output_port_type = 0; | |
762 | ||
763 | SCM_SMOB (bytevector_output_port_procedure, | |
764 | "r6rs-bytevector-output-port-procedure", | |
765 | 0); | |
766 | ||
767 | #define SCM_GC_BOP "r6rs-bytevector-output-port" | |
768 | #define SCM_BOP_BUFFER_INITIAL_SIZE 4096 | |
769 | ||
770 | /* Representation of a bop's internal buffer. */ | |
771 | typedef struct | |
772 | { | |
773 | size_t total_len; | |
774 | size_t len; | |
775 | size_t pos; | |
776 | char *buffer; | |
777 | } scm_t_bop_buffer; | |
778 | ||
779 | ||
780 | /* Accessing a bop's buffer. */ | |
781 | #define SCM_BOP_BUFFER(_port) \ | |
782 | ((scm_t_bop_buffer *) SCM_STREAM (_port)) | |
783 | #define SCM_SET_BOP_BUFFER(_port, _buf) \ | |
784 | (SCM_SETSTREAM ((_port), (scm_t_bits) (_buf))) | |
785 | ||
786 | ||
787 | static inline void | |
788 | bop_buffer_init (scm_t_bop_buffer *buf) | |
789 | { | |
790 | buf->total_len = buf->len = buf->pos = 0; | |
791 | buf->buffer = NULL; | |
792 | } | |
793 | ||
794 | static inline void | |
795 | bop_buffer_grow (scm_t_bop_buffer *buf, size_t min_size) | |
796 | { | |
797 | char *new_buf; | |
798 | size_t new_size; | |
799 | ||
800 | for (new_size = buf->total_len | |
801 | ? buf->total_len : SCM_BOP_BUFFER_INITIAL_SIZE; | |
802 | new_size < min_size; | |
803 | new_size *= 2); | |
804 | ||
805 | if (buf->buffer) | |
806 | new_buf = scm_gc_realloc ((void *) buf->buffer, buf->total_len, | |
807 | new_size, SCM_GC_BOP); | |
808 | else | |
05762e72 | 809 | new_buf = scm_gc_malloc_pointerless (new_size, SCM_GC_BOP); |
1ee2c72e LC |
810 | |
811 | buf->buffer = new_buf; | |
812 | buf->total_len = new_size; | |
813 | } | |
814 | ||
815 | static inline SCM | |
816 | make_bop (void) | |
817 | { | |
818 | SCM port, bop_proc; | |
819 | scm_t_port *c_port; | |
820 | scm_t_bop_buffer *buf; | |
821 | const unsigned long mode_bits = SCM_OPN | SCM_WRTNG; | |
822 | ||
a653d32a AR |
823 | scm_i_pthread_mutex_lock (&scm_i_port_table_mutex); |
824 | ||
1ee2c72e LC |
825 | port = scm_new_port_table_entry (bytevector_output_port_type); |
826 | ||
827 | buf = (scm_t_bop_buffer *) scm_gc_malloc (sizeof (* buf), SCM_GC_BOP); | |
828 | bop_buffer_init (buf); | |
829 | ||
830 | c_port = SCM_PTAB_ENTRY (port); | |
831 | c_port->write_buf = c_port->write_pos = c_port->write_end = NULL; | |
832 | c_port->write_buf_size = 0; | |
833 | ||
834 | SCM_SET_BOP_BUFFER (port, buf); | |
835 | ||
836 | /* Mark PORT as open and writable. */ | |
837 | SCM_SET_CELL_TYPE (port, bytevector_output_port_type | mode_bits); | |
838 | ||
a653d32a AR |
839 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
840 | ||
1ee2c72e | 841 | /* Make the bop procedure. */ |
a653d32a | 842 | SCM_NEWSMOB (bop_proc, bytevector_output_port_procedure, buf); |
1ee2c72e LC |
843 | |
844 | return (scm_values (scm_list_2 (port, bop_proc))); | |
845 | } | |
846 | ||
1ee2c72e LC |
847 | /* Write SIZE octets from DATA to PORT. */ |
848 | static void | |
849 | bop_write (SCM port, const void *data, size_t size) | |
850 | { | |
851 | scm_t_bop_buffer *buf; | |
852 | ||
853 | buf = SCM_BOP_BUFFER (port); | |
854 | ||
855 | if (buf->pos + size > buf->total_len) | |
856 | bop_buffer_grow (buf, buf->pos + size); | |
857 | ||
858 | memcpy (buf->buffer + buf->pos, data, size); | |
859 | buf->pos += size; | |
860 | buf->len = (buf->len > buf->pos) ? buf->len : buf->pos; | |
861 | } | |
862 | ||
f1ce9199 LC |
863 | static scm_t_off |
864 | bop_seek (SCM port, scm_t_off offset, int whence) | |
1ee2c72e LC |
865 | #define FUNC_NAME "bop_seek" |
866 | { | |
867 | scm_t_bop_buffer *buf; | |
868 | ||
869 | buf = SCM_BOP_BUFFER (port); | |
870 | switch (whence) | |
871 | { | |
872 | case SEEK_CUR: | |
f1ce9199 | 873 | offset += (scm_t_off) buf->pos; |
1ee2c72e LC |
874 | /* Fall through. */ |
875 | ||
876 | case SEEK_SET: | |
877 | if (offset < 0 || (unsigned) offset > buf->len) | |
878 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); | |
879 | else | |
880 | buf->pos = offset; | |
881 | break; | |
882 | ||
883 | case SEEK_END: | |
884 | if (offset < 0 || (unsigned) offset >= buf->len) | |
885 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); | |
886 | else | |
887 | buf->pos = buf->len - (offset + 1); | |
888 | break; | |
889 | ||
890 | default: | |
891 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
892 | "invalid `seek' parameter"); | |
893 | } | |
894 | ||
895 | return buf->pos; | |
896 | } | |
897 | #undef FUNC_NAME | |
898 | ||
899 | /* Fetch data from a bop. */ | |
900 | SCM_SMOB_APPLY (bytevector_output_port_procedure, | |
901 | bop_proc_apply, 0, 0, 0, (SCM bop_proc)) | |
902 | { | |
a653d32a | 903 | SCM bv; |
1ee2c72e LC |
904 | scm_t_bop_buffer *buf, result_buf; |
905 | ||
a653d32a | 906 | buf = (scm_t_bop_buffer *) SCM_SMOB_DATA (bop_proc); |
1ee2c72e LC |
907 | |
908 | result_buf = *buf; | |
909 | bop_buffer_init (buf); | |
910 | ||
911 | if (result_buf.len == 0) | |
912 | bv = scm_c_take_bytevector (NULL, 0); | |
913 | else | |
914 | { | |
915 | if (result_buf.total_len > result_buf.len) | |
916 | /* Shrink the buffer. */ | |
917 | result_buf.buffer = scm_gc_realloc ((void *) result_buf.buffer, | |
918 | result_buf.total_len, | |
919 | result_buf.len, | |
920 | SCM_GC_BOP); | |
921 | ||
922 | bv = scm_c_take_bytevector ((signed char *) result_buf.buffer, | |
923 | result_buf.len); | |
924 | } | |
925 | ||
926 | return bv; | |
927 | } | |
928 | ||
1ee2c72e LC |
929 | SCM_DEFINE (scm_open_bytevector_output_port, |
930 | "open-bytevector-output-port", 0, 1, 0, | |
931 | (SCM transcoder), | |
932 | "Return two values: an output port and a procedure. The latter " | |
933 | "should be called with zero arguments to obtain a bytevector " | |
934 | "containing the data accumulated by the port.") | |
935 | #define FUNC_NAME s_scm_open_bytevector_output_port | |
936 | { | |
937 | if (!SCM_UNBNDP (transcoder) && !scm_is_false (transcoder)) | |
938 | transcoders_not_implemented (); | |
939 | ||
940 | return (make_bop ()); | |
941 | } | |
942 | #undef FUNC_NAME | |
943 | ||
944 | static inline void | |
945 | initialize_bytevector_output_ports (void) | |
946 | { | |
947 | bytevector_output_port_type = | |
948 | scm_make_port_type ("r6rs-bytevector-output-port", | |
949 | NULL, bop_write); | |
950 | ||
951 | scm_set_port_seek (bytevector_output_port_type, bop_seek); | |
1ee2c72e LC |
952 | } |
953 | ||
954 | \f | |
955 | /* Custom binary output port ("cbop" for short). */ | |
956 | ||
957 | static scm_t_bits custom_binary_output_port_type; | |
958 | ||
959 | /* Return the various procedures of PORT. */ | |
960 | #define SCM_CBOP_WRITE_PROC(_port) \ | |
961 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 0) | |
962 | ||
963 | ||
964 | static inline SCM | |
965 | make_cbop (SCM write_proc, SCM get_position_proc, | |
966 | SCM set_position_proc, SCM close_proc) | |
967 | { | |
968 | SCM port, method_vector; | |
969 | scm_t_port *c_port; | |
970 | const unsigned long mode_bits = SCM_OPN | SCM_WRTNG; | |
971 | ||
972 | /* Store the various methods and bytevector in a vector. */ | |
973 | method_vector = scm_c_make_vector (4, SCM_BOOL_F); | |
974 | SCM_SIMPLE_VECTOR_SET (method_vector, 0, write_proc); | |
975 | SCM_SIMPLE_VECTOR_SET (method_vector, 1, get_position_proc); | |
976 | SCM_SIMPLE_VECTOR_SET (method_vector, 2, set_position_proc); | |
977 | SCM_SIMPLE_VECTOR_SET (method_vector, 3, close_proc); | |
978 | ||
a653d32a AR |
979 | scm_i_pthread_mutex_lock (&scm_i_port_table_mutex); |
980 | ||
1ee2c72e LC |
981 | port = scm_new_port_table_entry (custom_binary_output_port_type); |
982 | ||
983 | /* Attach it the method vector. */ | |
984 | SCM_SETSTREAM (port, SCM_UNPACK (method_vector)); | |
985 | ||
986 | /* Have the port directly access the buffer (bytevector). */ | |
987 | c_port = SCM_PTAB_ENTRY (port); | |
988 | c_port->write_buf = c_port->write_pos = c_port->write_end = NULL; | |
989 | c_port->write_buf_size = c_port->read_buf_size = 0; | |
990 | ||
991 | /* Mark PORT as open, writable and unbuffered. */ | |
992 | SCM_SET_CELL_TYPE (port, custom_binary_output_port_type | mode_bits); | |
993 | ||
a653d32a AR |
994 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
995 | ||
1ee2c72e LC |
996 | return port; |
997 | } | |
998 | ||
999 | /* Write SIZE octets from DATA to PORT. */ | |
1000 | static void | |
1001 | cbop_write (SCM port, const void *data, size_t size) | |
1002 | #define FUNC_NAME "cbop_write" | |
1003 | { | |
1004 | long int c_result; | |
1005 | size_t c_written; | |
1006 | SCM bv, write_proc, result; | |
1007 | ||
1008 | /* XXX: Allocating a new bytevector at each `write' call is inefficient, | |
1009 | but necessary since (1) we don't control the lifetime of the buffer | |
1010 | pointed to by DATA, and (2) the `write!' procedure could capture the | |
1011 | bytevector it is passed. */ | |
1012 | bv = scm_c_make_bytevector (size); | |
1013 | memcpy (SCM_BYTEVECTOR_CONTENTS (bv), data, size); | |
1014 | ||
1015 | write_proc = SCM_CBOP_WRITE_PROC (port); | |
1016 | ||
1017 | /* Since the `write' procedure of Guile's ports has type `void', it must | |
1018 | try hard to write exactly SIZE bytes, regardless of how many bytes the | |
1019 | sink can handle. */ | |
1020 | for (c_written = 0; | |
1021 | c_written < size; | |
1022 | c_written += c_result) | |
1023 | { | |
1024 | result = scm_call_3 (write_proc, bv, | |
1025 | scm_from_size_t (c_written), | |
1026 | scm_from_size_t (size - c_written)); | |
1027 | ||
1028 | c_result = scm_to_long (result); | |
1029 | if (SCM_UNLIKELY (c_result < 0 | |
1030 | || (size_t) c_result > (size - c_written))) | |
1031 | scm_wrong_type_arg_msg (FUNC_NAME, 0, result, | |
1032 | "R6RS custom binary output port `write!' " | |
1033 | "returned a incorrect integer"); | |
1034 | } | |
1035 | } | |
1036 | #undef FUNC_NAME | |
1037 | ||
1038 | ||
1039 | SCM_DEFINE (scm_make_custom_binary_output_port, | |
1040 | "make-custom-binary-output-port", 5, 0, 0, | |
1041 | (SCM id, SCM write_proc, SCM get_position_proc, | |
1042 | SCM set_position_proc, SCM close_proc), | |
1043 | "Return a new custom binary output port whose output is drained " | |
1044 | "by invoking @var{write_proc} and passing it a bytevector, an " | |
1045 | "index where octets should be written, and an octet count.") | |
1046 | #define FUNC_NAME s_scm_make_custom_binary_output_port | |
1047 | { | |
1048 | SCM_VALIDATE_STRING (1, id); | |
1049 | SCM_VALIDATE_PROC (2, write_proc); | |
1050 | ||
1051 | if (!scm_is_false (get_position_proc)) | |
1052 | SCM_VALIDATE_PROC (3, get_position_proc); | |
1053 | ||
1054 | if (!scm_is_false (set_position_proc)) | |
1055 | SCM_VALIDATE_PROC (4, set_position_proc); | |
1056 | ||
1057 | if (!scm_is_false (close_proc)) | |
1058 | SCM_VALIDATE_PROC (5, close_proc); | |
1059 | ||
1060 | return (make_cbop (write_proc, get_position_proc, set_position_proc, | |
1061 | close_proc)); | |
1062 | } | |
1063 | #undef FUNC_NAME | |
1064 | ||
1065 | ||
1066 | /* Instantiate the custom binary output port type. */ | |
1067 | static inline void | |
1068 | initialize_custom_binary_output_ports (void) | |
1069 | { | |
1070 | custom_binary_output_port_type = | |
1071 | scm_make_port_type ("r6rs-custom-binary-output-port", | |
1072 | NULL, cbop_write); | |
1073 | ||
1ee2c72e LC |
1074 | scm_set_port_seek (custom_binary_output_port_type, cbp_seek); |
1075 | scm_set_port_close (custom_binary_output_port_type, cbp_close); | |
1076 | } | |
1077 | ||
1078 | \f | |
1044537d AR |
1079 | /* Transcoded ports ("tp" for short). */ |
1080 | static scm_t_bits transcoded_port_type = 0; | |
1081 | ||
1082 | #define TP_INPUT_BUFFER_SIZE 4096 | |
1083 | ||
1084 | #define SCM_TP_BINARY_PORT(_port) SCM_PACK (SCM_STREAM (_port)) | |
1085 | ||
1086 | static inline SCM | |
1087 | make_tp (SCM binary_port, unsigned long mode) | |
1088 | { | |
1089 | SCM port; | |
1090 | scm_t_port *c_port; | |
1091 | const unsigned long mode_bits = SCM_OPN | mode; | |
1092 | ||
1093 | scm_i_pthread_mutex_lock (&scm_i_port_table_mutex); | |
1094 | ||
1095 | port = scm_new_port_table_entry (transcoded_port_type); | |
1096 | ||
1097 | SCM_SETSTREAM (port, SCM_UNPACK (binary_port)); | |
1098 | ||
1099 | SCM_SET_CELL_TYPE (port, transcoded_port_type | mode_bits); | |
1100 | ||
1101 | if (SCM_INPUT_PORT_P (port)) | |
1102 | { | |
1103 | c_port = SCM_PTAB_ENTRY (port); | |
1104 | c_port->read_buf = scm_gc_malloc_pointerless (TP_INPUT_BUFFER_SIZE, | |
1105 | "port buffer"); | |
1106 | c_port->read_pos = c_port->read_end = c_port->read_buf; | |
1107 | c_port->read_buf_size = TP_INPUT_BUFFER_SIZE; | |
1108 | ||
1109 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0); | |
1110 | } | |
1111 | ||
1112 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); | |
1113 | ||
1114 | return port; | |
1115 | } | |
1116 | ||
1117 | static void | |
1118 | tp_write (SCM port, const void *data, size_t size) | |
1119 | { | |
1120 | scm_c_write (SCM_TP_BINARY_PORT (port), data, size); | |
1121 | } | |
1122 | ||
1123 | static int | |
1124 | tp_fill_input (SCM port) | |
1125 | { | |
1126 | size_t count; | |
1127 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); | |
1128 | SCM bport = SCM_TP_BINARY_PORT (port); | |
1129 | scm_t_port *c_bport = SCM_PTAB_ENTRY (bport); | |
1130 | ||
1131 | /* We can't use `scm_c_read' here, since it blocks until the whole | |
1132 | block has been read or EOF. */ | |
1133 | ||
1134 | if (c_bport->rw_active == SCM_PORT_WRITE) | |
1135 | scm_force_output (bport); | |
1136 | ||
1137 | if (c_bport->read_pos >= c_bport->read_end) | |
1138 | scm_fill_input (bport); | |
1139 | ||
1140 | count = c_bport->read_end - c_bport->read_pos; | |
1141 | if (count > c_port->read_buf_size) | |
1142 | count = c_port->read_buf_size; | |
1143 | ||
1144 | memcpy (c_port->read_buf, c_bport->read_pos, count); | |
1145 | c_bport->read_pos += count; | |
1146 | ||
1147 | if (c_bport->rw_random) | |
1148 | c_bport->rw_active = SCM_PORT_READ; | |
1149 | ||
1150 | if (count == 0) | |
1151 | return EOF; | |
1152 | else | |
1153 | { | |
1154 | c_port->read_pos = c_port->read_buf; | |
1155 | c_port->read_end = c_port->read_buf + count; | |
1156 | return *c_port->read_buf; | |
1157 | } | |
1158 | } | |
1159 | ||
1160 | static void | |
1161 | tp_flush (SCM port) | |
1162 | { | |
1163 | SCM binary_port = SCM_TP_BINARY_PORT (port); | |
1164 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); | |
1165 | size_t count = c_port->write_pos - c_port->write_buf; | |
1166 | ||
1167 | scm_c_write (binary_port, c_port->write_buf, count); | |
1168 | ||
1169 | c_port->write_pos = c_port->write_buf; | |
1170 | c_port->rw_active = SCM_PORT_NEITHER; | |
1171 | ||
1172 | scm_force_output (binary_port); | |
1173 | } | |
1174 | ||
1175 | static int | |
1176 | tp_close (SCM port) | |
1177 | { | |
1178 | if (SCM_OUTPUT_PORT_P (port)) | |
1179 | tp_flush (port); | |
1180 | return scm_is_true (scm_close_port (SCM_TP_BINARY_PORT (port))) ? 0 : -1; | |
1181 | } | |
1182 | ||
1183 | static inline void | |
1184 | initialize_transcoded_ports (void) | |
1185 | { | |
1186 | transcoded_port_type = | |
1187 | scm_make_port_type ("r6rs-transcoded-port", tp_fill_input, tp_write); | |
1188 | ||
1189 | scm_set_port_flush (transcoded_port_type, tp_flush); | |
1190 | scm_set_port_close (transcoded_port_type, tp_close); | |
1191 | } | |
1192 | ||
1193 | SCM_DEFINE (scm_i_make_transcoded_port, | |
1194 | "%make-transcoded-port", 1, 0, 0, | |
1195 | (SCM port), | |
1196 | "Return a new port which reads and writes to @var{port}") | |
1197 | #define FUNC_NAME s_scm_i_make_transcoded_port | |
1198 | { | |
1199 | SCM result; | |
1200 | unsigned long mode = 0; | |
1201 | ||
1202 | SCM_VALIDATE_PORT (SCM_ARG1, port); | |
1203 | ||
1204 | if (scm_is_true (scm_output_port_p (port))) | |
1205 | mode |= SCM_WRTNG; | |
1206 | else if (scm_is_true (scm_input_port_p (port))) | |
1207 | mode |= SCM_RDNG; | |
1208 | ||
1209 | result = make_tp (port, mode); | |
1210 | ||
1211 | /* FIXME: We should actually close `port' "in a special way" here, | |
1212 | according to R6RS. As there is no way to do that in Guile without | |
1213 | rendering the underlying port unusable for our purposes as well, we | |
1214 | just leave it open. */ | |
1215 | ||
1216 | return result; | |
1217 | } | |
1218 | #undef FUNC_NAME | |
1219 | ||
1220 | \f | |
1ee2c72e LC |
1221 | /* Initialization. */ |
1222 | ||
c0062328 LC |
1223 | void |
1224 | scm_register_r6rs_ports (void) | |
1225 | { | |
1226 | scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION, | |
1227 | "scm_init_r6rs_ports", | |
1228 | (scm_t_extension_init_func) scm_init_r6rs_ports, | |
1229 | NULL); | |
1230 | } | |
1231 | ||
1ee2c72e LC |
1232 | void |
1233 | scm_init_r6rs_ports (void) | |
1234 | { | |
62e9a9b7 | 1235 | #include "libguile/r6rs-ports.x" |
1ee2c72e LC |
1236 | |
1237 | initialize_bytevector_input_ports (); | |
1238 | initialize_custom_binary_input_ports (); | |
1239 | initialize_bytevector_output_ports (); | |
1240 | initialize_custom_binary_output_ports (); | |
1044537d | 1241 | initialize_transcoded_ports (); |
1ee2c72e | 1242 | } |