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a6c377f7 | 1 | /* Copyright (C) 2009, 2010, 2011 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 | 89 | port = scm_new_port_table_entry (bytevector_input_port_type); |
96128014 LC |
90 | c_port = SCM_PTAB_ENTRY (port); |
91 | ||
92 | /* Match the expectation of `binary-port?'. */ | |
93 | c_port->encoding = NULL; | |
1ee2c72e LC |
94 | |
95 | /* Prevent BV from being GC'd. */ | |
96 | SCM_SETSTREAM (port, SCM_UNPACK (bv)); | |
97 | ||
98 | /* Have the port directly access the bytevector. */ | |
99 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
100 | c_len = SCM_BYTEVECTOR_LENGTH (bv); | |
101 | ||
1ee2c72e LC |
102 | c_port->read_pos = c_port->read_buf = (unsigned char *) c_bv; |
103 | c_port->read_end = (unsigned char *) c_bv + c_len; | |
104 | c_port->read_buf_size = c_len; | |
105 | ||
106 | /* Mark PORT as open, readable and unbuffered (hmm, how elegant...). */ | |
107 | SCM_SET_CELL_TYPE (port, bytevector_input_port_type | mode_bits); | |
108 | ||
a653d32a AR |
109 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
110 | ||
1ee2c72e LC |
111 | return port; |
112 | } | |
113 | ||
1ee2c72e LC |
114 | static int |
115 | bip_fill_input (SCM port) | |
116 | { | |
117 | int result; | |
118 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); | |
119 | ||
120 | if (c_port->read_pos >= c_port->read_end) | |
121 | result = EOF; | |
122 | else | |
123 | result = (int) *c_port->read_pos; | |
124 | ||
125 | return result; | |
126 | } | |
127 | ||
f1ce9199 LC |
128 | static scm_t_off |
129 | bip_seek (SCM port, scm_t_off offset, int whence) | |
1ee2c72e LC |
130 | #define FUNC_NAME "bip_seek" |
131 | { | |
f1ce9199 | 132 | scm_t_off c_result = 0; |
1ee2c72e LC |
133 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); |
134 | ||
135 | switch (whence) | |
136 | { | |
137 | case SEEK_CUR: | |
138 | offset += c_port->read_pos - c_port->read_buf; | |
139 | /* Fall through. */ | |
140 | ||
141 | case SEEK_SET: | |
c89b4529 | 142 | if (c_port->read_buf + offset <= c_port->read_end) |
1ee2c72e LC |
143 | { |
144 | c_port->read_pos = c_port->read_buf + offset; | |
145 | c_result = offset; | |
146 | } | |
147 | else | |
148 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); | |
149 | break; | |
150 | ||
151 | case SEEK_END: | |
152 | if (c_port->read_end - offset >= c_port->read_buf) | |
153 | { | |
154 | c_port->read_pos = c_port->read_end - offset; | |
155 | c_result = c_port->read_pos - c_port->read_buf; | |
156 | } | |
157 | else | |
158 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); | |
159 | break; | |
160 | ||
161 | default: | |
162 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
163 | "invalid `seek' parameter"); | |
164 | } | |
165 | ||
166 | return c_result; | |
167 | } | |
168 | #undef FUNC_NAME | |
169 | ||
170 | ||
171 | /* Instantiate the bytevector input port type. */ | |
172 | static inline void | |
173 | initialize_bytevector_input_ports (void) | |
174 | { | |
175 | bytevector_input_port_type = | |
176 | scm_make_port_type ("r6rs-bytevector-input-port", bip_fill_input, | |
177 | NULL); | |
178 | ||
1ee2c72e LC |
179 | scm_set_port_seek (bytevector_input_port_type, bip_seek); |
180 | } | |
181 | ||
182 | ||
183 | SCM_DEFINE (scm_open_bytevector_input_port, | |
184 | "open-bytevector-input-port", 1, 1, 0, | |
185 | (SCM bv, SCM transcoder), | |
186 | "Return an input port whose contents are drawn from " | |
187 | "bytevector @var{bv}.") | |
188 | #define FUNC_NAME s_scm_open_bytevector_input_port | |
189 | { | |
190 | SCM_VALIDATE_BYTEVECTOR (1, bv); | |
191 | if (!SCM_UNBNDP (transcoder) && !scm_is_false (transcoder)) | |
192 | transcoders_not_implemented (); | |
193 | ||
194 | return (make_bip (bv)); | |
195 | } | |
196 | #undef FUNC_NAME | |
197 | ||
198 | \f | |
199 | /* Custom binary ports. The following routines are shared by input and | |
200 | output custom binary ports. */ | |
201 | ||
202 | #define SCM_CBP_GET_POSITION_PROC(_port) \ | |
203 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 1) | |
204 | #define SCM_CBP_SET_POSITION_PROC(_port) \ | |
205 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 2) | |
206 | #define SCM_CBP_CLOSE_PROC(_port) \ | |
207 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 3) | |
208 | ||
f1ce9199 LC |
209 | static scm_t_off |
210 | cbp_seek (SCM port, scm_t_off offset, int whence) | |
1ee2c72e LC |
211 | #define FUNC_NAME "cbp_seek" |
212 | { | |
213 | SCM result; | |
f1ce9199 | 214 | scm_t_off c_result = 0; |
1ee2c72e LC |
215 | |
216 | switch (whence) | |
217 | { | |
218 | case SEEK_CUR: | |
219 | { | |
220 | SCM get_position_proc; | |
221 | ||
222 | get_position_proc = SCM_CBP_GET_POSITION_PROC (port); | |
223 | if (SCM_LIKELY (scm_is_true (get_position_proc))) | |
224 | result = scm_call_0 (get_position_proc); | |
225 | else | |
226 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
227 | "R6RS custom binary port does not " | |
228 | "support `port-position'"); | |
229 | ||
230 | offset += scm_to_int (result); | |
231 | /* Fall through. */ | |
232 | } | |
233 | ||
234 | case SEEK_SET: | |
235 | { | |
236 | SCM set_position_proc; | |
237 | ||
238 | set_position_proc = SCM_CBP_SET_POSITION_PROC (port); | |
239 | if (SCM_LIKELY (scm_is_true (set_position_proc))) | |
240 | result = scm_call_1 (set_position_proc, scm_from_int (offset)); | |
241 | else | |
242 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
243 | "R6RS custom binary port does not " | |
244 | "support `set-port-position!'"); | |
245 | ||
246 | /* Assuming setting the position succeeded. */ | |
247 | c_result = offset; | |
248 | break; | |
249 | } | |
250 | ||
251 | default: | |
252 | /* `SEEK_END' cannot be supported. */ | |
253 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
254 | "R6RS custom binary ports do not " | |
255 | "support `SEEK_END'"); | |
256 | } | |
257 | ||
258 | return c_result; | |
259 | } | |
260 | #undef FUNC_NAME | |
261 | ||
262 | static int | |
263 | cbp_close (SCM port) | |
264 | { | |
265 | SCM close_proc; | |
266 | ||
267 | close_proc = SCM_CBP_CLOSE_PROC (port); | |
268 | if (scm_is_true (close_proc)) | |
269 | /* Invoke the `close' thunk. */ | |
270 | scm_call_0 (close_proc); | |
271 | ||
272 | return 1; | |
273 | } | |
274 | ||
275 | \f | |
276 | /* Custom binary input port ("cbip" for short). */ | |
277 | ||
278 | static scm_t_bits custom_binary_input_port_type = 0; | |
279 | ||
280 | /* Size of the buffer embedded in custom binary input ports. */ | |
281 | #define CBIP_BUFFER_SIZE 4096 | |
282 | ||
283 | /* Return the bytevector associated with PORT. */ | |
284 | #define SCM_CBIP_BYTEVECTOR(_port) \ | |
285 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 4) | |
286 | ||
287 | /* Return the various procedures of PORT. */ | |
288 | #define SCM_CBIP_READ_PROC(_port) \ | |
289 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 0) | |
290 | ||
291 | ||
292 | static inline SCM | |
293 | make_cbip (SCM read_proc, SCM get_position_proc, | |
294 | SCM set_position_proc, SCM close_proc) | |
295 | { | |
296 | SCM port, bv, method_vector; | |
297 | char *c_bv; | |
298 | unsigned c_len; | |
299 | scm_t_port *c_port; | |
300 | const unsigned long mode_bits = SCM_OPN | SCM_RDNG; | |
301 | ||
302 | /* Use a bytevector as the underlying buffer. */ | |
303 | c_len = CBIP_BUFFER_SIZE; | |
304 | bv = scm_c_make_bytevector (c_len); | |
305 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
306 | ||
307 | /* Store the various methods and bytevector in a vector. */ | |
308 | method_vector = scm_c_make_vector (5, SCM_BOOL_F); | |
309 | SCM_SIMPLE_VECTOR_SET (method_vector, 4, bv); | |
310 | SCM_SIMPLE_VECTOR_SET (method_vector, 0, read_proc); | |
311 | SCM_SIMPLE_VECTOR_SET (method_vector, 1, get_position_proc); | |
312 | SCM_SIMPLE_VECTOR_SET (method_vector, 2, set_position_proc); | |
313 | SCM_SIMPLE_VECTOR_SET (method_vector, 3, close_proc); | |
314 | ||
a653d32a AR |
315 | scm_i_pthread_mutex_lock (&scm_i_port_table_mutex); |
316 | ||
1ee2c72e | 317 | port = scm_new_port_table_entry (custom_binary_input_port_type); |
96128014 LC |
318 | c_port = SCM_PTAB_ENTRY (port); |
319 | ||
320 | /* Match the expectation of `binary-port?'. */ | |
321 | c_port->encoding = NULL; | |
1ee2c72e LC |
322 | |
323 | /* Attach it the method vector. */ | |
324 | SCM_SETSTREAM (port, SCM_UNPACK (method_vector)); | |
325 | ||
326 | /* Have the port directly access the buffer (bytevector). */ | |
1ee2c72e LC |
327 | c_port->read_pos = c_port->read_buf = (unsigned char *) c_bv; |
328 | c_port->read_end = (unsigned char *) c_bv; | |
329 | c_port->read_buf_size = c_len; | |
330 | ||
331 | /* Mark PORT as open, readable and unbuffered (hmm, how elegant...). */ | |
332 | SCM_SET_CELL_TYPE (port, custom_binary_input_port_type | mode_bits); | |
333 | ||
a653d32a AR |
334 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
335 | ||
1ee2c72e LC |
336 | return port; |
337 | } | |
338 | ||
339 | static int | |
340 | cbip_fill_input (SCM port) | |
341 | #define FUNC_NAME "cbip_fill_input" | |
342 | { | |
343 | int result; | |
344 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); | |
345 | ||
346 | again: | |
347 | if (c_port->read_pos >= c_port->read_end) | |
348 | { | |
349 | /* Invoke the user's `read!' procedure. */ | |
350 | unsigned c_octets; | |
351 | SCM bv, read_proc, octets; | |
352 | ||
353 | /* Use the bytevector associated with PORT as the buffer passed to the | |
354 | `read!' procedure, thereby avoiding additional allocations. */ | |
355 | bv = SCM_CBIP_BYTEVECTOR (port); | |
356 | read_proc = SCM_CBIP_READ_PROC (port); | |
357 | ||
358 | /* The assumption here is that C_PORT's internal buffer wasn't changed | |
359 | behind our back. */ | |
360 | assert (c_port->read_buf == | |
361 | (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv)); | |
362 | assert ((unsigned) c_port->read_buf_size | |
363 | == SCM_BYTEVECTOR_LENGTH (bv)); | |
364 | ||
365 | octets = scm_call_3 (read_proc, bv, SCM_INUM0, | |
366 | SCM_I_MAKINUM (CBIP_BUFFER_SIZE)); | |
367 | c_octets = scm_to_uint (octets); | |
368 | ||
369 | c_port->read_pos = (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
370 | c_port->read_end = (unsigned char *) c_port->read_pos + c_octets; | |
371 | ||
372 | if (c_octets > 0) | |
373 | goto again; | |
374 | else | |
375 | result = EOF; | |
376 | } | |
377 | else | |
378 | result = (int) *c_port->read_pos; | |
379 | ||
380 | return result; | |
381 | } | |
382 | #undef FUNC_NAME | |
383 | ||
384 | ||
385 | SCM_DEFINE (scm_make_custom_binary_input_port, | |
386 | "make-custom-binary-input-port", 5, 0, 0, | |
387 | (SCM id, SCM read_proc, SCM get_position_proc, | |
388 | SCM set_position_proc, SCM close_proc), | |
389 | "Return a new custom binary input port whose input is drained " | |
390 | "by invoking @var{read_proc} and passing it a bytevector, an " | |
391 | "index where octets should be written, and an octet count.") | |
392 | #define FUNC_NAME s_scm_make_custom_binary_input_port | |
393 | { | |
394 | SCM_VALIDATE_STRING (1, id); | |
395 | SCM_VALIDATE_PROC (2, read_proc); | |
396 | ||
397 | if (!scm_is_false (get_position_proc)) | |
398 | SCM_VALIDATE_PROC (3, get_position_proc); | |
399 | ||
400 | if (!scm_is_false (set_position_proc)) | |
401 | SCM_VALIDATE_PROC (4, set_position_proc); | |
402 | ||
403 | if (!scm_is_false (close_proc)) | |
404 | SCM_VALIDATE_PROC (5, close_proc); | |
405 | ||
406 | return (make_cbip (read_proc, get_position_proc, set_position_proc, | |
407 | close_proc)); | |
408 | } | |
409 | #undef FUNC_NAME | |
410 | ||
411 | ||
412 | /* Instantiate the custom binary input port type. */ | |
413 | static inline void | |
414 | initialize_custom_binary_input_ports (void) | |
415 | { | |
416 | custom_binary_input_port_type = | |
417 | scm_make_port_type ("r6rs-custom-binary-input-port", | |
418 | cbip_fill_input, NULL); | |
419 | ||
1ee2c72e LC |
420 | scm_set_port_seek (custom_binary_input_port_type, cbp_seek); |
421 | scm_set_port_close (custom_binary_input_port_type, cbp_close); | |
422 | } | |
423 | ||
424 | ||
425 | \f | |
426 | /* Binary input. */ | |
427 | ||
428 | /* We currently don't support specific binary input ports. */ | |
429 | #define SCM_VALIDATE_BINARY_INPUT_PORT SCM_VALIDATE_OPINPORT | |
430 | ||
431 | SCM_DEFINE (scm_get_u8, "get-u8", 1, 0, 0, | |
432 | (SCM port), | |
433 | "Read an octet from @var{port}, a binary input port, " | |
434 | "blocking as necessary.") | |
435 | #define FUNC_NAME s_scm_get_u8 | |
436 | { | |
437 | SCM result; | |
438 | int c_result; | |
439 | ||
440 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
441 | ||
8aa47f26 | 442 | c_result = scm_get_byte_or_eof (port); |
1ee2c72e LC |
443 | if (c_result == EOF) |
444 | result = SCM_EOF_VAL; | |
445 | else | |
446 | result = SCM_I_MAKINUM ((unsigned char) c_result); | |
447 | ||
448 | return result; | |
449 | } | |
450 | #undef FUNC_NAME | |
451 | ||
452 | SCM_DEFINE (scm_lookahead_u8, "lookahead-u8", 1, 0, 0, | |
453 | (SCM port), | |
454 | "Like @code{get-u8} but does not update @var{port} to " | |
455 | "point past the octet.") | |
456 | #define FUNC_NAME s_scm_lookahead_u8 | |
457 | { | |
8aa47f26 | 458 | int u8; |
1ee2c72e LC |
459 | SCM result; |
460 | ||
461 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
462 | ||
452c5ad9 | 463 | u8 = scm_peek_byte_or_eof (port); |
8aa47f26 | 464 | if (u8 == EOF) |
1ee2c72e | 465 | result = SCM_EOF_VAL; |
8aa47f26 | 466 | else |
452c5ad9 | 467 | result = SCM_I_MAKINUM ((scm_t_uint8) u8); |
1ee2c72e LC |
468 | |
469 | return result; | |
470 | } | |
471 | #undef FUNC_NAME | |
472 | ||
473 | SCM_DEFINE (scm_get_bytevector_n, "get-bytevector-n", 2, 0, 0, | |
474 | (SCM port, SCM count), | |
475 | "Read @var{count} octets from @var{port}, blocking as " | |
476 | "necessary and return a bytevector containing the octets " | |
477 | "read. If fewer bytes are available, a bytevector smaller " | |
478 | "than @var{count} is returned.") | |
479 | #define FUNC_NAME s_scm_get_bytevector_n | |
480 | { | |
481 | SCM result; | |
482 | char *c_bv; | |
483 | unsigned c_count; | |
484 | size_t c_read; | |
485 | ||
486 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
487 | c_count = scm_to_uint (count); | |
488 | ||
489 | result = scm_c_make_bytevector (c_count); | |
490 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (result); | |
491 | ||
492 | if (SCM_LIKELY (c_count > 0)) | |
493 | /* XXX: `scm_c_read ()' does not update the port position. */ | |
494 | c_read = scm_c_read (port, c_bv, c_count); | |
495 | else | |
496 | /* Don't invoke `scm_c_read ()' since it may block. */ | |
497 | c_read = 0; | |
498 | ||
499 | if ((c_read == 0) && (c_count > 0)) | |
500 | { | |
501 | if (SCM_EOF_OBJECT_P (scm_peek_char (port))) | |
502 | result = SCM_EOF_VAL; | |
503 | else | |
504 | result = scm_null_bytevector; | |
505 | } | |
506 | else | |
507 | { | |
508 | if (c_read < c_count) | |
509 | result = scm_c_shrink_bytevector (result, c_read); | |
510 | } | |
511 | ||
512 | return result; | |
513 | } | |
514 | #undef FUNC_NAME | |
515 | ||
516 | SCM_DEFINE (scm_get_bytevector_n_x, "get-bytevector-n!", 4, 0, 0, | |
517 | (SCM port, SCM bv, SCM start, SCM count), | |
518 | "Read @var{count} bytes from @var{port} and store them " | |
519 | "in @var{bv} starting at index @var{start}. Return either " | |
520 | "the number of bytes actually read or the end-of-file " | |
521 | "object.") | |
522 | #define FUNC_NAME s_scm_get_bytevector_n_x | |
523 | { | |
524 | SCM result; | |
525 | char *c_bv; | |
526 | unsigned c_start, c_count, c_len; | |
527 | size_t c_read; | |
528 | ||
529 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
530 | SCM_VALIDATE_BYTEVECTOR (2, bv); | |
531 | c_start = scm_to_uint (start); | |
532 | c_count = scm_to_uint (count); | |
533 | ||
534 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
535 | c_len = SCM_BYTEVECTOR_LENGTH (bv); | |
536 | ||
537 | if (SCM_UNLIKELY (c_start + c_count > c_len)) | |
538 | scm_out_of_range (FUNC_NAME, count); | |
539 | ||
540 | if (SCM_LIKELY (c_count > 0)) | |
541 | c_read = scm_c_read (port, c_bv + c_start, c_count); | |
542 | else | |
543 | /* Don't invoke `scm_c_read ()' since it may block. */ | |
544 | c_read = 0; | |
545 | ||
546 | if ((c_read == 0) && (c_count > 0)) | |
547 | { | |
548 | if (SCM_EOF_OBJECT_P (scm_peek_char (port))) | |
549 | result = SCM_EOF_VAL; | |
550 | else | |
551 | result = SCM_I_MAKINUM (0); | |
552 | } | |
553 | else | |
554 | result = scm_from_size_t (c_read); | |
555 | ||
556 | return result; | |
557 | } | |
558 | #undef FUNC_NAME | |
559 | ||
560 | ||
561 | SCM_DEFINE (scm_get_bytevector_some, "get-bytevector-some", 1, 0, 0, | |
562 | (SCM port), | |
563 | "Read from @var{port}, blocking as necessary, until data " | |
564 | "are available or and end-of-file is reached. Return either " | |
565 | "a new bytevector containing the data read or the " | |
566 | "end-of-file object.") | |
567 | #define FUNC_NAME s_scm_get_bytevector_some | |
568 | { | |
569 | /* Read at least one byte, unless the end-of-file is already reached, and | |
570 | read while characters are available (buffered). */ | |
571 | ||
572 | SCM result; | |
573 | char *c_bv; | |
574 | unsigned c_len; | |
575 | size_t c_total; | |
576 | ||
577 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
578 | ||
579 | c_len = 4096; | |
05762e72 | 580 | c_bv = (char *) scm_gc_malloc_pointerless (c_len, SCM_GC_BYTEVECTOR); |
1ee2c72e LC |
581 | c_total = 0; |
582 | ||
583 | do | |
584 | { | |
585 | int c_chr; | |
586 | ||
587 | if (c_total + 1 > c_len) | |
588 | { | |
589 | /* Grow the bytevector. */ | |
590 | c_bv = (char *) scm_gc_realloc (c_bv, c_len, c_len * 2, | |
591 | SCM_GC_BYTEVECTOR); | |
592 | c_len *= 2; | |
593 | } | |
594 | ||
595 | /* We can't use `scm_c_read ()' since it blocks. */ | |
596 | c_chr = scm_getc (port); | |
597 | if (c_chr != EOF) | |
598 | { | |
599 | c_bv[c_total] = (char) c_chr; | |
600 | c_total++; | |
601 | } | |
602 | } | |
603 | while ((scm_is_true (scm_char_ready_p (port))) | |
604 | && (!SCM_EOF_OBJECT_P (scm_peek_char (port)))); | |
605 | ||
606 | if (c_total == 0) | |
607 | { | |
608 | result = SCM_EOF_VAL; | |
609 | scm_gc_free (c_bv, c_len, SCM_GC_BYTEVECTOR); | |
610 | } | |
611 | else | |
612 | { | |
613 | if (c_len > c_total) | |
614 | { | |
615 | /* Shrink the bytevector. */ | |
616 | c_bv = (char *) scm_gc_realloc (c_bv, c_len, c_total, | |
617 | SCM_GC_BYTEVECTOR); | |
618 | c_len = (unsigned) c_total; | |
619 | } | |
620 | ||
621 | result = scm_c_take_bytevector ((signed char *) c_bv, c_len); | |
622 | } | |
623 | ||
624 | return result; | |
625 | } | |
626 | #undef FUNC_NAME | |
627 | ||
628 | SCM_DEFINE (scm_get_bytevector_all, "get-bytevector-all", 1, 0, 0, | |
629 | (SCM port), | |
630 | "Read from @var{port}, blocking as necessary, until " | |
631 | "the end-of-file is reached. Return either " | |
632 | "a new bytevector containing the data read or the " | |
633 | "end-of-file object (if no data were available).") | |
634 | #define FUNC_NAME s_scm_get_bytevector_all | |
635 | { | |
636 | SCM result; | |
637 | char *c_bv; | |
638 | unsigned c_len, c_count; | |
639 | size_t c_read, c_total; | |
640 | ||
641 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
642 | ||
643 | c_len = c_count = 4096; | |
05762e72 | 644 | c_bv = (char *) scm_gc_malloc_pointerless (c_len, SCM_GC_BYTEVECTOR); |
1ee2c72e LC |
645 | c_total = c_read = 0; |
646 | ||
647 | do | |
648 | { | |
649 | if (c_total + c_read > c_len) | |
650 | { | |
651 | /* Grow the bytevector. */ | |
652 | c_bv = (char *) scm_gc_realloc (c_bv, c_len, c_len * 2, | |
653 | SCM_GC_BYTEVECTOR); | |
654 | c_count = c_len; | |
655 | c_len *= 2; | |
656 | } | |
657 | ||
658 | /* `scm_c_read ()' blocks until C_COUNT bytes are available or EOF is | |
659 | reached. */ | |
660 | c_read = scm_c_read (port, c_bv + c_total, c_count); | |
661 | c_total += c_read, c_count -= c_read; | |
662 | } | |
663 | while (!SCM_EOF_OBJECT_P (scm_peek_char (port))); | |
664 | ||
665 | if (c_total == 0) | |
666 | { | |
667 | result = SCM_EOF_VAL; | |
668 | scm_gc_free (c_bv, c_len, SCM_GC_BYTEVECTOR); | |
669 | } | |
670 | else | |
671 | { | |
672 | if (c_len > c_total) | |
673 | { | |
674 | /* Shrink the bytevector. */ | |
675 | c_bv = (char *) scm_gc_realloc (c_bv, c_len, c_total, | |
676 | SCM_GC_BYTEVECTOR); | |
677 | c_len = (unsigned) c_total; | |
678 | } | |
679 | ||
680 | result = scm_c_take_bytevector ((signed char *) c_bv, c_len); | |
681 | } | |
682 | ||
683 | return result; | |
684 | } | |
685 | #undef FUNC_NAME | |
686 | ||
687 | ||
688 | \f | |
689 | /* Binary output. */ | |
690 | ||
691 | /* We currently don't support specific binary input ports. */ | |
692 | #define SCM_VALIDATE_BINARY_OUTPUT_PORT SCM_VALIDATE_OPOUTPORT | |
693 | ||
694 | ||
695 | SCM_DEFINE (scm_put_u8, "put-u8", 2, 0, 0, | |
696 | (SCM port, SCM octet), | |
697 | "Write @var{octet} to binary port @var{port}.") | |
698 | #define FUNC_NAME s_scm_put_u8 | |
699 | { | |
700 | scm_t_uint8 c_octet; | |
701 | ||
702 | SCM_VALIDATE_BINARY_OUTPUT_PORT (1, port); | |
703 | c_octet = scm_to_uint8 (octet); | |
704 | ||
705 | scm_putc ((char) c_octet, port); | |
706 | ||
707 | return SCM_UNSPECIFIED; | |
708 | } | |
709 | #undef FUNC_NAME | |
710 | ||
711 | SCM_DEFINE (scm_put_bytevector, "put-bytevector", 2, 2, 0, | |
712 | (SCM port, SCM bv, SCM start, SCM count), | |
713 | "Write the contents of @var{bv} to @var{port}, optionally " | |
714 | "starting at index @var{start} and limiting to @var{count} " | |
715 | "octets.") | |
716 | #define FUNC_NAME s_scm_put_bytevector | |
717 | { | |
718 | char *c_bv; | |
719 | unsigned c_start, c_count, c_len; | |
720 | ||
721 | SCM_VALIDATE_BINARY_OUTPUT_PORT (1, port); | |
722 | SCM_VALIDATE_BYTEVECTOR (2, bv); | |
723 | ||
724 | c_len = SCM_BYTEVECTOR_LENGTH (bv); | |
725 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
726 | ||
d223c3fc | 727 | if (!scm_is_eq (start, SCM_UNDEFINED)) |
1ee2c72e LC |
728 | { |
729 | c_start = scm_to_uint (start); | |
730 | ||
d223c3fc | 731 | if (!scm_is_eq (count, SCM_UNDEFINED)) |
1ee2c72e LC |
732 | { |
733 | c_count = scm_to_uint (count); | |
734 | if (SCM_UNLIKELY (c_start + c_count > c_len)) | |
735 | scm_out_of_range (FUNC_NAME, count); | |
736 | } | |
737 | else | |
738 | { | |
739 | if (SCM_UNLIKELY (c_start >= c_len)) | |
740 | scm_out_of_range (FUNC_NAME, start); | |
741 | else | |
742 | c_count = c_len - c_start; | |
743 | } | |
744 | } | |
745 | else | |
746 | c_start = 0, c_count = c_len; | |
747 | ||
748 | scm_c_write (port, c_bv + c_start, c_count); | |
749 | ||
750 | return SCM_UNSPECIFIED; | |
751 | } | |
752 | #undef FUNC_NAME | |
753 | ||
754 | ||
755 | \f | |
756 | /* Bytevector output port ("bop" for short). */ | |
757 | ||
758 | /* Implementation of "bops". | |
759 | ||
760 | Each bop has an internal buffer, of type `scm_t_bop_buffer', attached to | |
761 | it. The procedure returned along with the output port is actually an | |
762 | applicable SMOB. The SMOB holds a reference to the port. When applied, | |
763 | the SMOB swallows the port's internal buffer, turning it into a | |
764 | bytevector, and resets it. | |
765 | ||
766 | XXX: Access to a bop's internal buffer is not thread-safe. */ | |
767 | ||
768 | static scm_t_bits bytevector_output_port_type = 0; | |
769 | ||
770 | SCM_SMOB (bytevector_output_port_procedure, | |
771 | "r6rs-bytevector-output-port-procedure", | |
772 | 0); | |
773 | ||
774 | #define SCM_GC_BOP "r6rs-bytevector-output-port" | |
775 | #define SCM_BOP_BUFFER_INITIAL_SIZE 4096 | |
776 | ||
777 | /* Representation of a bop's internal buffer. */ | |
778 | typedef struct | |
779 | { | |
780 | size_t total_len; | |
781 | size_t len; | |
782 | size_t pos; | |
783 | char *buffer; | |
784 | } scm_t_bop_buffer; | |
785 | ||
786 | ||
787 | /* Accessing a bop's buffer. */ | |
788 | #define SCM_BOP_BUFFER(_port) \ | |
789 | ((scm_t_bop_buffer *) SCM_STREAM (_port)) | |
790 | #define SCM_SET_BOP_BUFFER(_port, _buf) \ | |
791 | (SCM_SETSTREAM ((_port), (scm_t_bits) (_buf))) | |
792 | ||
793 | ||
794 | static inline void | |
795 | bop_buffer_init (scm_t_bop_buffer *buf) | |
796 | { | |
797 | buf->total_len = buf->len = buf->pos = 0; | |
798 | buf->buffer = NULL; | |
799 | } | |
800 | ||
801 | static inline void | |
802 | bop_buffer_grow (scm_t_bop_buffer *buf, size_t min_size) | |
803 | { | |
804 | char *new_buf; | |
805 | size_t new_size; | |
806 | ||
807 | for (new_size = buf->total_len | |
808 | ? buf->total_len : SCM_BOP_BUFFER_INITIAL_SIZE; | |
809 | new_size < min_size; | |
810 | new_size *= 2); | |
811 | ||
812 | if (buf->buffer) | |
813 | new_buf = scm_gc_realloc ((void *) buf->buffer, buf->total_len, | |
814 | new_size, SCM_GC_BOP); | |
815 | else | |
05762e72 | 816 | new_buf = scm_gc_malloc_pointerless (new_size, SCM_GC_BOP); |
1ee2c72e LC |
817 | |
818 | buf->buffer = new_buf; | |
819 | buf->total_len = new_size; | |
820 | } | |
821 | ||
822 | static inline SCM | |
823 | make_bop (void) | |
824 | { | |
825 | SCM port, bop_proc; | |
826 | scm_t_port *c_port; | |
827 | scm_t_bop_buffer *buf; | |
828 | const unsigned long mode_bits = SCM_OPN | SCM_WRTNG; | |
829 | ||
a653d32a AR |
830 | scm_i_pthread_mutex_lock (&scm_i_port_table_mutex); |
831 | ||
1ee2c72e | 832 | port = scm_new_port_table_entry (bytevector_output_port_type); |
96128014 LC |
833 | c_port = SCM_PTAB_ENTRY (port); |
834 | ||
835 | /* Match the expectation of `binary-port?'. */ | |
836 | c_port->encoding = NULL; | |
1ee2c72e LC |
837 | |
838 | buf = (scm_t_bop_buffer *) scm_gc_malloc (sizeof (* buf), SCM_GC_BOP); | |
839 | bop_buffer_init (buf); | |
840 | ||
1ee2c72e LC |
841 | c_port->write_buf = c_port->write_pos = c_port->write_end = NULL; |
842 | c_port->write_buf_size = 0; | |
843 | ||
844 | SCM_SET_BOP_BUFFER (port, buf); | |
845 | ||
846 | /* Mark PORT as open and writable. */ | |
847 | SCM_SET_CELL_TYPE (port, bytevector_output_port_type | mode_bits); | |
848 | ||
a653d32a AR |
849 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
850 | ||
1ee2c72e | 851 | /* Make the bop procedure. */ |
a653d32a | 852 | SCM_NEWSMOB (bop_proc, bytevector_output_port_procedure, buf); |
1ee2c72e LC |
853 | |
854 | return (scm_values (scm_list_2 (port, bop_proc))); | |
855 | } | |
856 | ||
1ee2c72e LC |
857 | /* Write SIZE octets from DATA to PORT. */ |
858 | static void | |
859 | bop_write (SCM port, const void *data, size_t size) | |
860 | { | |
861 | scm_t_bop_buffer *buf; | |
862 | ||
863 | buf = SCM_BOP_BUFFER (port); | |
864 | ||
865 | if (buf->pos + size > buf->total_len) | |
866 | bop_buffer_grow (buf, buf->pos + size); | |
867 | ||
868 | memcpy (buf->buffer + buf->pos, data, size); | |
869 | buf->pos += size; | |
870 | buf->len = (buf->len > buf->pos) ? buf->len : buf->pos; | |
871 | } | |
872 | ||
f1ce9199 LC |
873 | static scm_t_off |
874 | bop_seek (SCM port, scm_t_off offset, int whence) | |
1ee2c72e LC |
875 | #define FUNC_NAME "bop_seek" |
876 | { | |
877 | scm_t_bop_buffer *buf; | |
878 | ||
879 | buf = SCM_BOP_BUFFER (port); | |
880 | switch (whence) | |
881 | { | |
882 | case SEEK_CUR: | |
f1ce9199 | 883 | offset += (scm_t_off) buf->pos; |
1ee2c72e LC |
884 | /* Fall through. */ |
885 | ||
886 | case SEEK_SET: | |
887 | if (offset < 0 || (unsigned) offset > buf->len) | |
888 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); | |
889 | else | |
890 | buf->pos = offset; | |
891 | break; | |
892 | ||
893 | case SEEK_END: | |
894 | if (offset < 0 || (unsigned) offset >= buf->len) | |
895 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); | |
896 | else | |
897 | buf->pos = buf->len - (offset + 1); | |
898 | break; | |
899 | ||
900 | default: | |
901 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
902 | "invalid `seek' parameter"); | |
903 | } | |
904 | ||
905 | return buf->pos; | |
906 | } | |
907 | #undef FUNC_NAME | |
908 | ||
909 | /* Fetch data from a bop. */ | |
910 | SCM_SMOB_APPLY (bytevector_output_port_procedure, | |
911 | bop_proc_apply, 0, 0, 0, (SCM bop_proc)) | |
912 | { | |
a653d32a | 913 | SCM bv; |
1ee2c72e LC |
914 | scm_t_bop_buffer *buf, result_buf; |
915 | ||
a653d32a | 916 | buf = (scm_t_bop_buffer *) SCM_SMOB_DATA (bop_proc); |
1ee2c72e LC |
917 | |
918 | result_buf = *buf; | |
919 | bop_buffer_init (buf); | |
920 | ||
921 | if (result_buf.len == 0) | |
922 | bv = scm_c_take_bytevector (NULL, 0); | |
923 | else | |
924 | { | |
925 | if (result_buf.total_len > result_buf.len) | |
926 | /* Shrink the buffer. */ | |
927 | result_buf.buffer = scm_gc_realloc ((void *) result_buf.buffer, | |
928 | result_buf.total_len, | |
929 | result_buf.len, | |
930 | SCM_GC_BOP); | |
931 | ||
932 | bv = scm_c_take_bytevector ((signed char *) result_buf.buffer, | |
933 | result_buf.len); | |
934 | } | |
935 | ||
936 | return bv; | |
937 | } | |
938 | ||
1ee2c72e LC |
939 | SCM_DEFINE (scm_open_bytevector_output_port, |
940 | "open-bytevector-output-port", 0, 1, 0, | |
941 | (SCM transcoder), | |
942 | "Return two values: an output port and a procedure. The latter " | |
943 | "should be called with zero arguments to obtain a bytevector " | |
944 | "containing the data accumulated by the port.") | |
945 | #define FUNC_NAME s_scm_open_bytevector_output_port | |
946 | { | |
947 | if (!SCM_UNBNDP (transcoder) && !scm_is_false (transcoder)) | |
948 | transcoders_not_implemented (); | |
949 | ||
950 | return (make_bop ()); | |
951 | } | |
952 | #undef FUNC_NAME | |
953 | ||
954 | static inline void | |
955 | initialize_bytevector_output_ports (void) | |
956 | { | |
957 | bytevector_output_port_type = | |
958 | scm_make_port_type ("r6rs-bytevector-output-port", | |
959 | NULL, bop_write); | |
960 | ||
961 | scm_set_port_seek (bytevector_output_port_type, bop_seek); | |
1ee2c72e LC |
962 | } |
963 | ||
964 | \f | |
965 | /* Custom binary output port ("cbop" for short). */ | |
966 | ||
967 | static scm_t_bits custom_binary_output_port_type; | |
968 | ||
969 | /* Return the various procedures of PORT. */ | |
970 | #define SCM_CBOP_WRITE_PROC(_port) \ | |
971 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 0) | |
972 | ||
973 | ||
974 | static inline SCM | |
975 | make_cbop (SCM write_proc, SCM get_position_proc, | |
976 | SCM set_position_proc, SCM close_proc) | |
977 | { | |
978 | SCM port, method_vector; | |
979 | scm_t_port *c_port; | |
980 | const unsigned long mode_bits = SCM_OPN | SCM_WRTNG; | |
981 | ||
982 | /* Store the various methods and bytevector in a vector. */ | |
983 | method_vector = scm_c_make_vector (4, SCM_BOOL_F); | |
984 | SCM_SIMPLE_VECTOR_SET (method_vector, 0, write_proc); | |
985 | SCM_SIMPLE_VECTOR_SET (method_vector, 1, get_position_proc); | |
986 | SCM_SIMPLE_VECTOR_SET (method_vector, 2, set_position_proc); | |
987 | SCM_SIMPLE_VECTOR_SET (method_vector, 3, close_proc); | |
988 | ||
a653d32a AR |
989 | scm_i_pthread_mutex_lock (&scm_i_port_table_mutex); |
990 | ||
1ee2c72e | 991 | port = scm_new_port_table_entry (custom_binary_output_port_type); |
96128014 LC |
992 | c_port = SCM_PTAB_ENTRY (port); |
993 | ||
994 | /* Match the expectation of `binary-port?'. */ | |
995 | c_port->encoding = NULL; | |
1ee2c72e LC |
996 | |
997 | /* Attach it the method vector. */ | |
998 | SCM_SETSTREAM (port, SCM_UNPACK (method_vector)); | |
999 | ||
1000 | /* Have the port directly access the buffer (bytevector). */ | |
1ee2c72e LC |
1001 | c_port->write_buf = c_port->write_pos = c_port->write_end = NULL; |
1002 | c_port->write_buf_size = c_port->read_buf_size = 0; | |
1003 | ||
1004 | /* Mark PORT as open, writable and unbuffered. */ | |
1005 | SCM_SET_CELL_TYPE (port, custom_binary_output_port_type | mode_bits); | |
1006 | ||
a653d32a AR |
1007 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
1008 | ||
1ee2c72e LC |
1009 | return port; |
1010 | } | |
1011 | ||
1012 | /* Write SIZE octets from DATA to PORT. */ | |
1013 | static void | |
1014 | cbop_write (SCM port, const void *data, size_t size) | |
1015 | #define FUNC_NAME "cbop_write" | |
1016 | { | |
1017 | long int c_result; | |
1018 | size_t c_written; | |
1019 | SCM bv, write_proc, result; | |
1020 | ||
1021 | /* XXX: Allocating a new bytevector at each `write' call is inefficient, | |
1022 | but necessary since (1) we don't control the lifetime of the buffer | |
1023 | pointed to by DATA, and (2) the `write!' procedure could capture the | |
1024 | bytevector it is passed. */ | |
1025 | bv = scm_c_make_bytevector (size); | |
1026 | memcpy (SCM_BYTEVECTOR_CONTENTS (bv), data, size); | |
1027 | ||
1028 | write_proc = SCM_CBOP_WRITE_PROC (port); | |
1029 | ||
1030 | /* Since the `write' procedure of Guile's ports has type `void', it must | |
1031 | try hard to write exactly SIZE bytes, regardless of how many bytes the | |
1032 | sink can handle. */ | |
1033 | for (c_written = 0; | |
1034 | c_written < size; | |
1035 | c_written += c_result) | |
1036 | { | |
1037 | result = scm_call_3 (write_proc, bv, | |
1038 | scm_from_size_t (c_written), | |
1039 | scm_from_size_t (size - c_written)); | |
1040 | ||
1041 | c_result = scm_to_long (result); | |
1042 | if (SCM_UNLIKELY (c_result < 0 | |
1043 | || (size_t) c_result > (size - c_written))) | |
1044 | scm_wrong_type_arg_msg (FUNC_NAME, 0, result, | |
1045 | "R6RS custom binary output port `write!' " | |
1046 | "returned a incorrect integer"); | |
1047 | } | |
1048 | } | |
1049 | #undef FUNC_NAME | |
1050 | ||
1051 | ||
1052 | SCM_DEFINE (scm_make_custom_binary_output_port, | |
1053 | "make-custom-binary-output-port", 5, 0, 0, | |
1054 | (SCM id, SCM write_proc, SCM get_position_proc, | |
1055 | SCM set_position_proc, SCM close_proc), | |
1056 | "Return a new custom binary output port whose output is drained " | |
1057 | "by invoking @var{write_proc} and passing it a bytevector, an " | |
1058 | "index where octets should be written, and an octet count.") | |
1059 | #define FUNC_NAME s_scm_make_custom_binary_output_port | |
1060 | { | |
1061 | SCM_VALIDATE_STRING (1, id); | |
1062 | SCM_VALIDATE_PROC (2, write_proc); | |
1063 | ||
1064 | if (!scm_is_false (get_position_proc)) | |
1065 | SCM_VALIDATE_PROC (3, get_position_proc); | |
1066 | ||
1067 | if (!scm_is_false (set_position_proc)) | |
1068 | SCM_VALIDATE_PROC (4, set_position_proc); | |
1069 | ||
1070 | if (!scm_is_false (close_proc)) | |
1071 | SCM_VALIDATE_PROC (5, close_proc); | |
1072 | ||
1073 | return (make_cbop (write_proc, get_position_proc, set_position_proc, | |
1074 | close_proc)); | |
1075 | } | |
1076 | #undef FUNC_NAME | |
1077 | ||
1078 | ||
1079 | /* Instantiate the custom binary output port type. */ | |
1080 | static inline void | |
1081 | initialize_custom_binary_output_ports (void) | |
1082 | { | |
1083 | custom_binary_output_port_type = | |
1084 | scm_make_port_type ("r6rs-custom-binary-output-port", | |
1085 | NULL, cbop_write); | |
1086 | ||
1ee2c72e LC |
1087 | scm_set_port_seek (custom_binary_output_port_type, cbp_seek); |
1088 | scm_set_port_close (custom_binary_output_port_type, cbp_close); | |
1089 | } | |
1090 | ||
1091 | \f | |
1044537d AR |
1092 | /* Transcoded ports ("tp" for short). */ |
1093 | static scm_t_bits transcoded_port_type = 0; | |
1094 | ||
1095 | #define TP_INPUT_BUFFER_SIZE 4096 | |
1096 | ||
1097 | #define SCM_TP_BINARY_PORT(_port) SCM_PACK (SCM_STREAM (_port)) | |
1098 | ||
1099 | static inline SCM | |
1100 | make_tp (SCM binary_port, unsigned long mode) | |
1101 | { | |
1102 | SCM port; | |
1103 | scm_t_port *c_port; | |
1104 | const unsigned long mode_bits = SCM_OPN | mode; | |
1105 | ||
1106 | scm_i_pthread_mutex_lock (&scm_i_port_table_mutex); | |
1107 | ||
1108 | port = scm_new_port_table_entry (transcoded_port_type); | |
1109 | ||
1110 | SCM_SETSTREAM (port, SCM_UNPACK (binary_port)); | |
1111 | ||
1112 | SCM_SET_CELL_TYPE (port, transcoded_port_type | mode_bits); | |
1113 | ||
1114 | if (SCM_INPUT_PORT_P (port)) | |
1115 | { | |
1116 | c_port = SCM_PTAB_ENTRY (port); | |
1117 | c_port->read_buf = scm_gc_malloc_pointerless (TP_INPUT_BUFFER_SIZE, | |
1118 | "port buffer"); | |
1119 | c_port->read_pos = c_port->read_end = c_port->read_buf; | |
1120 | c_port->read_buf_size = TP_INPUT_BUFFER_SIZE; | |
1121 | ||
1122 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0); | |
1123 | } | |
1124 | ||
1125 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); | |
1126 | ||
1127 | return port; | |
1128 | } | |
1129 | ||
1130 | static void | |
1131 | tp_write (SCM port, const void *data, size_t size) | |
1132 | { | |
1133 | scm_c_write (SCM_TP_BINARY_PORT (port), data, size); | |
1134 | } | |
1135 | ||
1136 | static int | |
1137 | tp_fill_input (SCM port) | |
1138 | { | |
1139 | size_t count; | |
1140 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); | |
1141 | SCM bport = SCM_TP_BINARY_PORT (port); | |
1142 | scm_t_port *c_bport = SCM_PTAB_ENTRY (bport); | |
1143 | ||
1144 | /* We can't use `scm_c_read' here, since it blocks until the whole | |
1145 | block has been read or EOF. */ | |
1146 | ||
1147 | if (c_bport->rw_active == SCM_PORT_WRITE) | |
1148 | scm_force_output (bport); | |
1149 | ||
1150 | if (c_bport->read_pos >= c_bport->read_end) | |
1151 | scm_fill_input (bport); | |
1152 | ||
1153 | count = c_bport->read_end - c_bport->read_pos; | |
1154 | if (count > c_port->read_buf_size) | |
1155 | count = c_port->read_buf_size; | |
1156 | ||
1157 | memcpy (c_port->read_buf, c_bport->read_pos, count); | |
1158 | c_bport->read_pos += count; | |
1159 | ||
1160 | if (c_bport->rw_random) | |
1161 | c_bport->rw_active = SCM_PORT_READ; | |
1162 | ||
1163 | if (count == 0) | |
1164 | return EOF; | |
1165 | else | |
1166 | { | |
1167 | c_port->read_pos = c_port->read_buf; | |
1168 | c_port->read_end = c_port->read_buf + count; | |
1169 | return *c_port->read_buf; | |
1170 | } | |
1171 | } | |
1172 | ||
1173 | static void | |
1174 | tp_flush (SCM port) | |
1175 | { | |
1176 | SCM binary_port = SCM_TP_BINARY_PORT (port); | |
1177 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); | |
1178 | size_t count = c_port->write_pos - c_port->write_buf; | |
1179 | ||
dfb572a7 AR |
1180 | /* As the runtime will try to flush all ports upon exit, we test for |
1181 | the underlying port still being open here. Otherwise, when you | |
1182 | would explicitly close the underlying port and the transcoded port | |
1183 | still had data outstanding, you'd get an exception on Guile exit. | |
1184 | ||
1185 | We just throw away the data when the underlying port is closed. */ | |
1186 | ||
1187 | if (SCM_OPOUTPORTP (binary_port)) | |
1188 | scm_c_write (binary_port, c_port->write_buf, count); | |
1044537d AR |
1189 | |
1190 | c_port->write_pos = c_port->write_buf; | |
1191 | c_port->rw_active = SCM_PORT_NEITHER; | |
1192 | ||
dfb572a7 AR |
1193 | if (SCM_OPOUTPORTP (binary_port)) |
1194 | scm_force_output (binary_port); | |
1044537d AR |
1195 | } |
1196 | ||
1197 | static int | |
1198 | tp_close (SCM port) | |
1199 | { | |
1200 | if (SCM_OUTPUT_PORT_P (port)) | |
1201 | tp_flush (port); | |
1202 | return scm_is_true (scm_close_port (SCM_TP_BINARY_PORT (port))) ? 0 : -1; | |
1203 | } | |
1204 | ||
1205 | static inline void | |
1206 | initialize_transcoded_ports (void) | |
1207 | { | |
1208 | transcoded_port_type = | |
1209 | scm_make_port_type ("r6rs-transcoded-port", tp_fill_input, tp_write); | |
1210 | ||
1211 | scm_set_port_flush (transcoded_port_type, tp_flush); | |
1212 | scm_set_port_close (transcoded_port_type, tp_close); | |
1213 | } | |
1214 | ||
1215 | SCM_DEFINE (scm_i_make_transcoded_port, | |
1216 | "%make-transcoded-port", 1, 0, 0, | |
1217 | (SCM port), | |
1218 | "Return a new port which reads and writes to @var{port}") | |
1219 | #define FUNC_NAME s_scm_i_make_transcoded_port | |
1220 | { | |
1221 | SCM result; | |
1222 | unsigned long mode = 0; | |
1223 | ||
1224 | SCM_VALIDATE_PORT (SCM_ARG1, port); | |
1225 | ||
1226 | if (scm_is_true (scm_output_port_p (port))) | |
1227 | mode |= SCM_WRTNG; | |
1228 | else if (scm_is_true (scm_input_port_p (port))) | |
1229 | mode |= SCM_RDNG; | |
1230 | ||
1231 | result = make_tp (port, mode); | |
1232 | ||
1233 | /* FIXME: We should actually close `port' "in a special way" here, | |
1234 | according to R6RS. As there is no way to do that in Guile without | |
1235 | rendering the underlying port unusable for our purposes as well, we | |
1236 | just leave it open. */ | |
1237 | ||
1238 | return result; | |
1239 | } | |
1240 | #undef FUNC_NAME | |
1241 | ||
1242 | \f | |
a6c377f7 AR |
1243 | /* Textual I/O */ |
1244 | ||
1245 | SCM_DEFINE (scm_get_string_n_x, | |
1246 | "get-string-n!", 4, 0, 0, | |
1247 | (SCM port, SCM str, SCM start, SCM count), | |
1248 | "Read up to @var{count} characters from @var{port} into " | |
1249 | "@var{str}, starting at @var{start}. If no characters " | |
1250 | "can be read before the end of file is encountered, the end " | |
1251 | "of file object is returned. Otherwise, the number of " | |
1252 | "characters read is returned.") | |
1253 | #define FUNC_NAME s_scm_get_string_n_x | |
1254 | { | |
1255 | size_t c_start, c_count, c_len, c_end, j; | |
1256 | scm_t_wchar c; | |
1257 | ||
1258 | SCM_VALIDATE_OPINPORT (1, port); | |
1259 | SCM_VALIDATE_STRING (2, str); | |
1260 | c_len = scm_c_string_length (str); | |
1261 | c_start = scm_to_size_t (start); | |
1262 | c_count = scm_to_size_t (count); | |
1263 | c_end = c_start + c_count; | |
1264 | ||
1265 | if (SCM_UNLIKELY (c_end > c_len)) | |
1266 | scm_out_of_range (FUNC_NAME, count); | |
1267 | ||
1268 | for (j = c_start; j < c_end; j++) | |
1269 | { | |
1270 | c = scm_getc (port); | |
1271 | if (c == EOF) | |
1272 | { | |
1273 | size_t chars_read = j - c_start; | |
1274 | return chars_read == 0 ? SCM_EOF_VAL : scm_from_size_t (chars_read); | |
1275 | } | |
1276 | scm_c_string_set_x (str, j, SCM_MAKE_CHAR (c)); | |
1277 | } | |
1278 | return count; | |
1279 | } | |
1280 | #undef FUNC_NAME | |
1281 | ||
1282 | \f | |
1ee2c72e LC |
1283 | /* Initialization. */ |
1284 | ||
c0062328 LC |
1285 | void |
1286 | scm_register_r6rs_ports (void) | |
1287 | { | |
1288 | scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION, | |
1289 | "scm_init_r6rs_ports", | |
1290 | (scm_t_extension_init_func) scm_init_r6rs_ports, | |
1291 | NULL); | |
1292 | } | |
1293 | ||
1ee2c72e LC |
1294 | void |
1295 | scm_init_r6rs_ports (void) | |
1296 | { | |
62e9a9b7 | 1297 | #include "libguile/r6rs-ports.x" |
1ee2c72e LC |
1298 | |
1299 | initialize_bytevector_input_ports (); | |
1300 | initialize_custom_binary_input_ports (); | |
1301 | initialize_bytevector_output_ports (); | |
1302 | initialize_custom_binary_output_ports (); | |
1044537d | 1303 | initialize_transcoded_ports (); |
1ee2c72e | 1304 | } |