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c9d55a7e | 1 | /* Copyright (C) 2009, 2010, 2011, 2013, 2014 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" | |
8ca97482 | 40 | #include "libguile/ports-internal.h" |
1ee2c72e LC |
41 | |
42 | ||
43 | \f | |
44 | /* Unimplemented features. */ | |
45 | ||
46 | ||
47 | /* Transoders are currently not implemented since Guile 1.8 is not | |
48 | Unicode-capable. Thus, most of the code here assumes the use of the | |
49 | binary transcoder. */ | |
50 | static inline void | |
51 | transcoders_not_implemented (void) | |
52 | { | |
53 | fprintf (stderr, "%s: warning: transcoders not implemented\n", | |
54 | PACKAGE_NAME); | |
55 | } | |
56 | ||
57 | \f | |
58 | /* End-of-file object. */ | |
59 | ||
60 | SCM_DEFINE (scm_eof_object, "eof-object", 0, 0, 0, | |
61 | (void), | |
62 | "Return the end-of-file object.") | |
63 | #define FUNC_NAME s_scm_eof_object | |
64 | { | |
65 | return (SCM_EOF_VAL); | |
66 | } | |
67 | #undef FUNC_NAME | |
68 | ||
69 | \f | |
70 | /* Input ports. */ | |
71 | ||
72 | #ifndef MIN | |
73 | # define MIN(a,b) ((a) < (b) ? (a) : (b)) | |
74 | #endif | |
75 | ||
76 | /* Bytevector input ports or "bip" for short. */ | |
77 | static scm_t_bits bytevector_input_port_type = 0; | |
78 | ||
79 | static inline SCM | |
80 | make_bip (SCM bv) | |
81 | { | |
82 | SCM port; | |
83 | char *c_bv; | |
84 | unsigned c_len; | |
85 | scm_t_port *c_port; | |
86 | const unsigned long mode_bits = SCM_OPN | SCM_RDNG; | |
87 | ||
a653d32a AR |
88 | scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex); |
89 | ||
1ee2c72e | 90 | port = scm_new_port_table_entry (bytevector_input_port_type); |
96128014 LC |
91 | c_port = SCM_PTAB_ENTRY (port); |
92 | ||
93 | /* Match the expectation of `binary-port?'. */ | |
94 | c_port->encoding = NULL; | |
1ee2c72e LC |
95 | |
96 | /* Prevent BV from being GC'd. */ | |
97 | SCM_SETSTREAM (port, SCM_UNPACK (bv)); | |
98 | ||
99 | /* Have the port directly access the bytevector. */ | |
100 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
101 | c_len = SCM_BYTEVECTOR_LENGTH (bv); | |
102 | ||
1ee2c72e LC |
103 | c_port->read_pos = c_port->read_buf = (unsigned char *) c_bv; |
104 | c_port->read_end = (unsigned char *) c_bv + c_len; | |
105 | c_port->read_buf_size = c_len; | |
106 | ||
107 | /* Mark PORT as open, readable and unbuffered (hmm, how elegant...). */ | |
108 | SCM_SET_CELL_TYPE (port, bytevector_input_port_type | mode_bits); | |
109 | ||
a653d32a AR |
110 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
111 | ||
1ee2c72e LC |
112 | return port; |
113 | } | |
114 | ||
1ee2c72e LC |
115 | static int |
116 | bip_fill_input (SCM port) | |
117 | { | |
118 | int result; | |
119 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); | |
120 | ||
121 | if (c_port->read_pos >= c_port->read_end) | |
122 | result = EOF; | |
123 | else | |
124 | result = (int) *c_port->read_pos; | |
125 | ||
126 | return result; | |
127 | } | |
128 | ||
f1ce9199 LC |
129 | static scm_t_off |
130 | bip_seek (SCM port, scm_t_off offset, int whence) | |
1ee2c72e LC |
131 | #define FUNC_NAME "bip_seek" |
132 | { | |
f1ce9199 | 133 | scm_t_off c_result = 0; |
1ee2c72e LC |
134 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); |
135 | ||
136 | switch (whence) | |
137 | { | |
138 | case SEEK_CUR: | |
139 | offset += c_port->read_pos - c_port->read_buf; | |
140 | /* Fall through. */ | |
141 | ||
142 | case SEEK_SET: | |
c89b4529 | 143 | if (c_port->read_buf + offset <= c_port->read_end) |
1ee2c72e LC |
144 | { |
145 | c_port->read_pos = c_port->read_buf + offset; | |
146 | c_result = offset; | |
147 | } | |
148 | else | |
149 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); | |
150 | break; | |
151 | ||
152 | case SEEK_END: | |
153 | if (c_port->read_end - offset >= c_port->read_buf) | |
154 | { | |
155 | c_port->read_pos = c_port->read_end - offset; | |
156 | c_result = c_port->read_pos - c_port->read_buf; | |
157 | } | |
158 | else | |
159 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); | |
160 | break; | |
161 | ||
162 | default: | |
163 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
164 | "invalid `seek' parameter"); | |
165 | } | |
166 | ||
167 | return c_result; | |
168 | } | |
169 | #undef FUNC_NAME | |
170 | ||
171 | ||
172 | /* Instantiate the bytevector input port type. */ | |
173 | static inline void | |
174 | initialize_bytevector_input_ports (void) | |
175 | { | |
176 | bytevector_input_port_type = | |
177 | scm_make_port_type ("r6rs-bytevector-input-port", bip_fill_input, | |
178 | NULL); | |
179 | ||
1ee2c72e LC |
180 | scm_set_port_seek (bytevector_input_port_type, bip_seek); |
181 | } | |
182 | ||
183 | ||
184 | SCM_DEFINE (scm_open_bytevector_input_port, | |
185 | "open-bytevector-input-port", 1, 1, 0, | |
186 | (SCM bv, SCM transcoder), | |
187 | "Return an input port whose contents are drawn from " | |
188 | "bytevector @var{bv}.") | |
189 | #define FUNC_NAME s_scm_open_bytevector_input_port | |
190 | { | |
191 | SCM_VALIDATE_BYTEVECTOR (1, bv); | |
192 | if (!SCM_UNBNDP (transcoder) && !scm_is_false (transcoder)) | |
193 | transcoders_not_implemented (); | |
194 | ||
195 | return (make_bip (bv)); | |
196 | } | |
197 | #undef FUNC_NAME | |
198 | ||
199 | \f | |
200 | /* Custom binary ports. The following routines are shared by input and | |
201 | output custom binary ports. */ | |
202 | ||
203 | #define SCM_CBP_GET_POSITION_PROC(_port) \ | |
204 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 1) | |
205 | #define SCM_CBP_SET_POSITION_PROC(_port) \ | |
206 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 2) | |
207 | #define SCM_CBP_CLOSE_PROC(_port) \ | |
208 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 3) | |
209 | ||
f1ce9199 LC |
210 | static scm_t_off |
211 | cbp_seek (SCM port, scm_t_off offset, int whence) | |
1ee2c72e LC |
212 | #define FUNC_NAME "cbp_seek" |
213 | { | |
214 | SCM result; | |
f1ce9199 | 215 | scm_t_off c_result = 0; |
1ee2c72e LC |
216 | |
217 | switch (whence) | |
218 | { | |
219 | case SEEK_CUR: | |
220 | { | |
221 | SCM get_position_proc; | |
222 | ||
223 | get_position_proc = SCM_CBP_GET_POSITION_PROC (port); | |
224 | if (SCM_LIKELY (scm_is_true (get_position_proc))) | |
225 | result = scm_call_0 (get_position_proc); | |
226 | else | |
227 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
c9d55a7e LC |
228 | "R6RS custom binary port with " |
229 | "`port-position' support"); | |
230 | c_result = scm_to_int (result); | |
231 | if (offset == 0) | |
232 | /* We just want to know the current position. */ | |
233 | break; | |
234 | ||
235 | offset += c_result; | |
1ee2c72e LC |
236 | /* Fall through. */ |
237 | } | |
238 | ||
239 | case SEEK_SET: | |
240 | { | |
241 | SCM set_position_proc; | |
242 | ||
243 | set_position_proc = SCM_CBP_SET_POSITION_PROC (port); | |
244 | if (SCM_LIKELY (scm_is_true (set_position_proc))) | |
245 | result = scm_call_1 (set_position_proc, scm_from_int (offset)); | |
246 | else | |
247 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
c9d55a7e | 248 | "seekable R6RS custom binary port"); |
1ee2c72e LC |
249 | |
250 | /* Assuming setting the position succeeded. */ | |
251 | c_result = offset; | |
252 | break; | |
253 | } | |
254 | ||
255 | default: | |
256 | /* `SEEK_END' cannot be supported. */ | |
257 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
258 | "R6RS custom binary ports do not " | |
259 | "support `SEEK_END'"); | |
260 | } | |
261 | ||
262 | return c_result; | |
263 | } | |
264 | #undef FUNC_NAME | |
265 | ||
266 | static int | |
267 | cbp_close (SCM port) | |
268 | { | |
269 | SCM close_proc; | |
270 | ||
271 | close_proc = SCM_CBP_CLOSE_PROC (port); | |
272 | if (scm_is_true (close_proc)) | |
273 | /* Invoke the `close' thunk. */ | |
274 | scm_call_0 (close_proc); | |
275 | ||
276 | return 1; | |
277 | } | |
278 | ||
279 | \f | |
280 | /* Custom binary input port ("cbip" for short). */ | |
281 | ||
282 | static scm_t_bits custom_binary_input_port_type = 0; | |
283 | ||
8ca97482 LC |
284 | /* Initial size of the buffer embedded in custom binary input ports. */ |
285 | #define CBIP_BUFFER_SIZE 8192 | |
1ee2c72e LC |
286 | |
287 | /* Return the bytevector associated with PORT. */ | |
288 | #define SCM_CBIP_BYTEVECTOR(_port) \ | |
289 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 4) | |
290 | ||
8ca97482 LC |
291 | /* Set BV as the bytevector associated with PORT. */ |
292 | #define SCM_SET_CBIP_BYTEVECTOR(_port, _bv) \ | |
293 | SCM_SIMPLE_VECTOR_SET (SCM_PACK (SCM_STREAM (_port)), 4, (_bv)) | |
294 | ||
1ee2c72e LC |
295 | /* Return the various procedures of PORT. */ |
296 | #define SCM_CBIP_READ_PROC(_port) \ | |
297 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 0) | |
298 | ||
299 | ||
8ca97482 LC |
300 | /* Set PORT's internal buffer according to READ_SIZE. */ |
301 | static void | |
302 | cbip_setvbuf (SCM port, long read_size, long write_size) | |
303 | { | |
304 | SCM bv; | |
305 | scm_t_port *pt; | |
306 | ||
307 | pt = SCM_PTAB_ENTRY (port); | |
308 | bv = SCM_CBIP_BYTEVECTOR (port); | |
309 | ||
310 | switch (read_size) | |
311 | { | |
312 | case 0: | |
313 | /* Unbuffered: keep PORT's bytevector as is (it will be used in | |
314 | future 'scm_c_read' calls), but point to the one-byte buffer. */ | |
315 | pt->read_buf = &pt->shortbuf; | |
316 | pt->read_buf_size = 1; | |
317 | break; | |
318 | ||
319 | case -1: | |
320 | /* Preferred size: keep the current bytevector and use it as the | |
321 | backing store. */ | |
322 | pt->read_buf = (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
323 | pt->read_buf_size = SCM_BYTEVECTOR_LENGTH (bv); | |
324 | break; | |
325 | ||
326 | default: | |
327 | /* Fully buffered: allocate a buffer of READ_SIZE bytes. */ | |
328 | bv = scm_c_make_bytevector (read_size); | |
329 | SCM_SET_CBIP_BYTEVECTOR (port, bv); | |
330 | pt->read_buf = (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
331 | pt->read_buf_size = read_size; | |
332 | } | |
333 | ||
334 | pt->read_pos = pt->read_end = pt->read_buf; | |
335 | } | |
336 | ||
1ee2c72e LC |
337 | static inline SCM |
338 | make_cbip (SCM read_proc, SCM get_position_proc, | |
339 | SCM set_position_proc, SCM close_proc) | |
340 | { | |
341 | SCM port, bv, method_vector; | |
342 | char *c_bv; | |
343 | unsigned c_len; | |
344 | scm_t_port *c_port; | |
345 | const unsigned long mode_bits = SCM_OPN | SCM_RDNG; | |
346 | ||
347 | /* Use a bytevector as the underlying buffer. */ | |
348 | c_len = CBIP_BUFFER_SIZE; | |
349 | bv = scm_c_make_bytevector (c_len); | |
350 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
351 | ||
352 | /* Store the various methods and bytevector in a vector. */ | |
353 | method_vector = scm_c_make_vector (5, SCM_BOOL_F); | |
354 | SCM_SIMPLE_VECTOR_SET (method_vector, 4, bv); | |
355 | SCM_SIMPLE_VECTOR_SET (method_vector, 0, read_proc); | |
356 | SCM_SIMPLE_VECTOR_SET (method_vector, 1, get_position_proc); | |
357 | SCM_SIMPLE_VECTOR_SET (method_vector, 2, set_position_proc); | |
358 | SCM_SIMPLE_VECTOR_SET (method_vector, 3, close_proc); | |
359 | ||
a653d32a AR |
360 | scm_i_pthread_mutex_lock (&scm_i_port_table_mutex); |
361 | ||
1ee2c72e | 362 | port = scm_new_port_table_entry (custom_binary_input_port_type); |
96128014 LC |
363 | c_port = SCM_PTAB_ENTRY (port); |
364 | ||
365 | /* Match the expectation of `binary-port?'. */ | |
366 | c_port->encoding = NULL; | |
1ee2c72e LC |
367 | |
368 | /* Attach it the method vector. */ | |
369 | SCM_SETSTREAM (port, SCM_UNPACK (method_vector)); | |
370 | ||
371 | /* Have the port directly access the buffer (bytevector). */ | |
1ee2c72e LC |
372 | c_port->read_pos = c_port->read_buf = (unsigned char *) c_bv; |
373 | c_port->read_end = (unsigned char *) c_bv; | |
374 | c_port->read_buf_size = c_len; | |
375 | ||
8ca97482 LC |
376 | /* 'setvbuf' is supported. */ |
377 | SCM_PORT_GET_INTERNAL (port)->setvbuf = cbip_setvbuf; | |
378 | ||
379 | /* Mark PORT as open and readable. */ | |
1ee2c72e LC |
380 | SCM_SET_CELL_TYPE (port, custom_binary_input_port_type | mode_bits); |
381 | ||
a653d32a AR |
382 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
383 | ||
1ee2c72e LC |
384 | return port; |
385 | } | |
386 | ||
387 | static int | |
388 | cbip_fill_input (SCM port) | |
389 | #define FUNC_NAME "cbip_fill_input" | |
390 | { | |
391 | int result; | |
392 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); | |
393 | ||
1ee2c72e LC |
394 | if (c_port->read_pos >= c_port->read_end) |
395 | { | |
396 | /* Invoke the user's `read!' procedure. */ | |
8ca97482 | 397 | int buffered; |
6df03222 | 398 | size_t c_octets, c_requested; |
1ee2c72e LC |
399 | SCM bv, read_proc, octets; |
400 | ||
6df03222 | 401 | c_requested = c_port->read_buf_size; |
8ca97482 | 402 | read_proc = SCM_CBIP_READ_PROC (port); |
6df03222 | 403 | |
1ee2c72e | 404 | bv = SCM_CBIP_BYTEVECTOR (port); |
8ca97482 LC |
405 | buffered = |
406 | (c_port->read_buf == (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv)); | |
1ee2c72e | 407 | |
8ca97482 LC |
408 | if (buffered) |
409 | /* Make sure the buffer isn't corrupt. BV can be passed directly | |
410 | to READ_PROC. */ | |
411 | assert (c_port->read_buf_size == SCM_BYTEVECTOR_LENGTH (bv)); | |
412 | else | |
413 | { | |
414 | /* This is an unbuffered port. When called via the | |
415 | 'get-bytevector-*' procedures, and thus via 'scm_c_read', we | |
416 | are passed the caller-provided buffer, so we need to check its | |
417 | size. */ | |
418 | if (SCM_BYTEVECTOR_LENGTH (bv) < c_requested) | |
419 | { | |
420 | /* Bad luck: we have to make another allocation. Save that | |
421 | bytevector for later reuse, in the hope that the application | |
422 | has regular access patterns. */ | |
423 | bv = scm_c_make_bytevector (c_requested); | |
424 | SCM_SET_CBIP_BYTEVECTOR (port, bv); | |
425 | } | |
426 | } | |
1ee2c72e LC |
427 | |
428 | octets = scm_call_3 (read_proc, bv, SCM_INUM0, | |
6df03222 LC |
429 | scm_from_size_t (c_requested)); |
430 | c_octets = scm_to_size_t (octets); | |
431 | if (SCM_UNLIKELY (c_octets > c_requested)) | |
432 | scm_out_of_range (FUNC_NAME, octets); | |
1ee2c72e | 433 | |
8ca97482 LC |
434 | if (!buffered) |
435 | /* Copy the data back to the internal buffer. */ | |
436 | memcpy ((char *) c_port->read_pos, SCM_BYTEVECTOR_CONTENTS (bv), | |
437 | c_octets); | |
438 | ||
1ee2c72e LC |
439 | c_port->read_end = (unsigned char *) c_port->read_pos + c_octets; |
440 | ||
8ca97482 LC |
441 | if (c_octets != 0 || c_requested == 0) |
442 | result = (int) *c_port->read_pos; | |
1ee2c72e LC |
443 | else |
444 | result = EOF; | |
445 | } | |
446 | else | |
447 | result = (int) *c_port->read_pos; | |
448 | ||
449 | return result; | |
450 | } | |
451 | #undef FUNC_NAME | |
452 | ||
453 | ||
454 | SCM_DEFINE (scm_make_custom_binary_input_port, | |
455 | "make-custom-binary-input-port", 5, 0, 0, | |
456 | (SCM id, SCM read_proc, SCM get_position_proc, | |
457 | SCM set_position_proc, SCM close_proc), | |
458 | "Return a new custom binary input port whose input is drained " | |
459 | "by invoking @var{read_proc} and passing it a bytevector, an " | |
460 | "index where octets should be written, and an octet count.") | |
461 | #define FUNC_NAME s_scm_make_custom_binary_input_port | |
462 | { | |
463 | SCM_VALIDATE_STRING (1, id); | |
464 | SCM_VALIDATE_PROC (2, read_proc); | |
465 | ||
466 | if (!scm_is_false (get_position_proc)) | |
467 | SCM_VALIDATE_PROC (3, get_position_proc); | |
468 | ||
469 | if (!scm_is_false (set_position_proc)) | |
470 | SCM_VALIDATE_PROC (4, set_position_proc); | |
471 | ||
472 | if (!scm_is_false (close_proc)) | |
473 | SCM_VALIDATE_PROC (5, close_proc); | |
474 | ||
475 | return (make_cbip (read_proc, get_position_proc, set_position_proc, | |
476 | close_proc)); | |
477 | } | |
478 | #undef FUNC_NAME | |
479 | ||
480 | ||
481 | /* Instantiate the custom binary input port type. */ | |
482 | static inline void | |
483 | initialize_custom_binary_input_ports (void) | |
484 | { | |
485 | custom_binary_input_port_type = | |
486 | scm_make_port_type ("r6rs-custom-binary-input-port", | |
487 | cbip_fill_input, NULL); | |
488 | ||
1ee2c72e LC |
489 | scm_set_port_seek (custom_binary_input_port_type, cbp_seek); |
490 | scm_set_port_close (custom_binary_input_port_type, cbp_close); | |
491 | } | |
492 | ||
493 | ||
494 | \f | |
495 | /* Binary input. */ | |
496 | ||
497 | /* We currently don't support specific binary input ports. */ | |
498 | #define SCM_VALIDATE_BINARY_INPUT_PORT SCM_VALIDATE_OPINPORT | |
499 | ||
500 | SCM_DEFINE (scm_get_u8, "get-u8", 1, 0, 0, | |
501 | (SCM port), | |
502 | "Read an octet from @var{port}, a binary input port, " | |
503 | "blocking as necessary.") | |
504 | #define FUNC_NAME s_scm_get_u8 | |
505 | { | |
506 | SCM result; | |
507 | int c_result; | |
508 | ||
509 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
510 | ||
8aa47f26 | 511 | c_result = scm_get_byte_or_eof (port); |
1ee2c72e LC |
512 | if (c_result == EOF) |
513 | result = SCM_EOF_VAL; | |
514 | else | |
515 | result = SCM_I_MAKINUM ((unsigned char) c_result); | |
516 | ||
517 | return result; | |
518 | } | |
519 | #undef FUNC_NAME | |
520 | ||
521 | SCM_DEFINE (scm_lookahead_u8, "lookahead-u8", 1, 0, 0, | |
522 | (SCM port), | |
523 | "Like @code{get-u8} but does not update @var{port} to " | |
524 | "point past the octet.") | |
525 | #define FUNC_NAME s_scm_lookahead_u8 | |
526 | { | |
8aa47f26 | 527 | int u8; |
1ee2c72e LC |
528 | SCM result; |
529 | ||
530 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
531 | ||
452c5ad9 | 532 | u8 = scm_peek_byte_or_eof (port); |
8aa47f26 | 533 | if (u8 == EOF) |
1ee2c72e | 534 | result = SCM_EOF_VAL; |
8aa47f26 | 535 | else |
452c5ad9 | 536 | result = SCM_I_MAKINUM ((scm_t_uint8) u8); |
1ee2c72e LC |
537 | |
538 | return result; | |
539 | } | |
540 | #undef FUNC_NAME | |
541 | ||
542 | SCM_DEFINE (scm_get_bytevector_n, "get-bytevector-n", 2, 0, 0, | |
543 | (SCM port, SCM count), | |
544 | "Read @var{count} octets from @var{port}, blocking as " | |
545 | "necessary and return a bytevector containing the octets " | |
546 | "read. If fewer bytes are available, a bytevector smaller " | |
547 | "than @var{count} is returned.") | |
548 | #define FUNC_NAME s_scm_get_bytevector_n | |
549 | { | |
550 | SCM result; | |
551 | char *c_bv; | |
552 | unsigned c_count; | |
553 | size_t c_read; | |
554 | ||
555 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
556 | c_count = scm_to_uint (count); | |
557 | ||
558 | result = scm_c_make_bytevector (c_count); | |
559 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (result); | |
560 | ||
561 | if (SCM_LIKELY (c_count > 0)) | |
562 | /* XXX: `scm_c_read ()' does not update the port position. */ | |
563 | c_read = scm_c_read (port, c_bv, c_count); | |
564 | else | |
565 | /* Don't invoke `scm_c_read ()' since it may block. */ | |
566 | c_read = 0; | |
567 | ||
47f2bce5 | 568 | if (c_read < c_count) |
1ee2c72e | 569 | { |
47f2bce5 MW |
570 | if (c_read == 0) |
571 | result = SCM_EOF_VAL; | |
1ee2c72e | 572 | else |
1ee2c72e LC |
573 | result = scm_c_shrink_bytevector (result, c_read); |
574 | } | |
575 | ||
576 | return result; | |
577 | } | |
578 | #undef FUNC_NAME | |
579 | ||
580 | SCM_DEFINE (scm_get_bytevector_n_x, "get-bytevector-n!", 4, 0, 0, | |
581 | (SCM port, SCM bv, SCM start, SCM count), | |
582 | "Read @var{count} bytes from @var{port} and store them " | |
583 | "in @var{bv} starting at index @var{start}. Return either " | |
584 | "the number of bytes actually read or the end-of-file " | |
585 | "object.") | |
586 | #define FUNC_NAME s_scm_get_bytevector_n_x | |
587 | { | |
588 | SCM result; | |
589 | char *c_bv; | |
590 | unsigned c_start, c_count, c_len; | |
591 | size_t c_read; | |
592 | ||
593 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
594 | SCM_VALIDATE_BYTEVECTOR (2, bv); | |
595 | c_start = scm_to_uint (start); | |
596 | c_count = scm_to_uint (count); | |
597 | ||
598 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
599 | c_len = SCM_BYTEVECTOR_LENGTH (bv); | |
600 | ||
601 | if (SCM_UNLIKELY (c_start + c_count > c_len)) | |
602 | scm_out_of_range (FUNC_NAME, count); | |
603 | ||
604 | if (SCM_LIKELY (c_count > 0)) | |
605 | c_read = scm_c_read (port, c_bv + c_start, c_count); | |
606 | else | |
607 | /* Don't invoke `scm_c_read ()' since it may block. */ | |
608 | c_read = 0; | |
609 | ||
47f2bce5 MW |
610 | if (c_read == 0 && c_count > 0) |
611 | result = SCM_EOF_VAL; | |
1ee2c72e LC |
612 | else |
613 | result = scm_from_size_t (c_read); | |
614 | ||
615 | return result; | |
616 | } | |
617 | #undef FUNC_NAME | |
618 | ||
619 | ||
620 | SCM_DEFINE (scm_get_bytevector_some, "get-bytevector-some", 1, 0, 0, | |
621 | (SCM port), | |
21bbe22a MW |
622 | "Read from @var{port}, blocking as necessary, until bytes " |
623 | "are available or an end-of-file is reached. Return either " | |
624 | "the end-of-file object or a new bytevector containing some " | |
625 | "of the available bytes (at least one), and update the port " | |
626 | "position to point just past these bytes.") | |
1ee2c72e LC |
627 | #define FUNC_NAME s_scm_get_bytevector_some |
628 | { | |
21bbe22a MW |
629 | scm_t_port *pt; |
630 | size_t size; | |
631 | SCM bv; | |
1ee2c72e LC |
632 | |
633 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
21bbe22a | 634 | pt = SCM_PTAB_ENTRY (port); |
1ee2c72e | 635 | |
21bbe22a MW |
636 | if (pt->rw_active == SCM_PORT_WRITE) |
637 | scm_ptobs[SCM_PTOBNUM (port)].flush (port); | |
1ee2c72e | 638 | |
21bbe22a MW |
639 | if (pt->rw_random) |
640 | pt->rw_active = SCM_PORT_READ; | |
1ee2c72e | 641 | |
21bbe22a | 642 | if (pt->read_pos >= pt->read_end) |
1ee2c72e | 643 | { |
21bbe22a MW |
644 | if (scm_fill_input (port) == EOF) |
645 | return SCM_EOF_VAL; | |
1ee2c72e | 646 | } |
1ee2c72e | 647 | |
21bbe22a MW |
648 | size = pt->read_end - pt->read_pos; |
649 | if (pt->read_buf == pt->putback_buf) | |
650 | size += pt->saved_read_end - pt->saved_read_pos; | |
1ee2c72e | 651 | |
21bbe22a MW |
652 | bv = scm_c_make_bytevector (size); |
653 | scm_take_from_input_buffers | |
654 | (port, (char *) SCM_BYTEVECTOR_CONTENTS (bv), size); | |
655 | ||
656 | return bv; | |
1ee2c72e LC |
657 | } |
658 | #undef FUNC_NAME | |
659 | ||
660 | SCM_DEFINE (scm_get_bytevector_all, "get-bytevector-all", 1, 0, 0, | |
661 | (SCM port), | |
662 | "Read from @var{port}, blocking as necessary, until " | |
663 | "the end-of-file is reached. Return either " | |
664 | "a new bytevector containing the data read or the " | |
665 | "end-of-file object (if no data were available).") | |
666 | #define FUNC_NAME s_scm_get_bytevector_all | |
667 | { | |
668 | SCM result; | |
669 | char *c_bv; | |
670 | unsigned c_len, c_count; | |
671 | size_t c_read, c_total; | |
672 | ||
673 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
674 | ||
675 | c_len = c_count = 4096; | |
05762e72 | 676 | c_bv = (char *) scm_gc_malloc_pointerless (c_len, SCM_GC_BYTEVECTOR); |
1ee2c72e LC |
677 | c_total = c_read = 0; |
678 | ||
679 | do | |
680 | { | |
681 | if (c_total + c_read > c_len) | |
682 | { | |
683 | /* Grow the bytevector. */ | |
684 | c_bv = (char *) scm_gc_realloc (c_bv, c_len, c_len * 2, | |
685 | SCM_GC_BYTEVECTOR); | |
686 | c_count = c_len; | |
687 | c_len *= 2; | |
688 | } | |
689 | ||
690 | /* `scm_c_read ()' blocks until C_COUNT bytes are available or EOF is | |
691 | reached. */ | |
692 | c_read = scm_c_read (port, c_bv + c_total, c_count); | |
693 | c_total += c_read, c_count -= c_read; | |
694 | } | |
47f2bce5 | 695 | while (c_count == 0); |
1ee2c72e LC |
696 | |
697 | if (c_total == 0) | |
698 | { | |
699 | result = SCM_EOF_VAL; | |
700 | scm_gc_free (c_bv, c_len, SCM_GC_BYTEVECTOR); | |
701 | } | |
702 | else | |
703 | { | |
704 | if (c_len > c_total) | |
705 | { | |
706 | /* Shrink the bytevector. */ | |
707 | c_bv = (char *) scm_gc_realloc (c_bv, c_len, c_total, | |
708 | SCM_GC_BYTEVECTOR); | |
709 | c_len = (unsigned) c_total; | |
710 | } | |
711 | ||
fb031aba | 712 | result = scm_c_take_gc_bytevector ((signed char *) c_bv, c_len); |
1ee2c72e LC |
713 | } |
714 | ||
715 | return result; | |
716 | } | |
717 | #undef FUNC_NAME | |
718 | ||
719 | ||
720 | \f | |
721 | /* Binary output. */ | |
722 | ||
723 | /* We currently don't support specific binary input ports. */ | |
724 | #define SCM_VALIDATE_BINARY_OUTPUT_PORT SCM_VALIDATE_OPOUTPORT | |
725 | ||
726 | ||
727 | SCM_DEFINE (scm_put_u8, "put-u8", 2, 0, 0, | |
728 | (SCM port, SCM octet), | |
729 | "Write @var{octet} to binary port @var{port}.") | |
730 | #define FUNC_NAME s_scm_put_u8 | |
731 | { | |
732 | scm_t_uint8 c_octet; | |
733 | ||
734 | SCM_VALIDATE_BINARY_OUTPUT_PORT (1, port); | |
735 | c_octet = scm_to_uint8 (octet); | |
736 | ||
737 | scm_putc ((char) c_octet, port); | |
738 | ||
739 | return SCM_UNSPECIFIED; | |
740 | } | |
741 | #undef FUNC_NAME | |
742 | ||
743 | SCM_DEFINE (scm_put_bytevector, "put-bytevector", 2, 2, 0, | |
744 | (SCM port, SCM bv, SCM start, SCM count), | |
745 | "Write the contents of @var{bv} to @var{port}, optionally " | |
746 | "starting at index @var{start} and limiting to @var{count} " | |
747 | "octets.") | |
748 | #define FUNC_NAME s_scm_put_bytevector | |
749 | { | |
750 | char *c_bv; | |
751 | unsigned c_start, c_count, c_len; | |
752 | ||
753 | SCM_VALIDATE_BINARY_OUTPUT_PORT (1, port); | |
754 | SCM_VALIDATE_BYTEVECTOR (2, bv); | |
755 | ||
756 | c_len = SCM_BYTEVECTOR_LENGTH (bv); | |
757 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
758 | ||
d223c3fc | 759 | if (!scm_is_eq (start, SCM_UNDEFINED)) |
1ee2c72e LC |
760 | { |
761 | c_start = scm_to_uint (start); | |
762 | ||
d223c3fc | 763 | if (!scm_is_eq (count, SCM_UNDEFINED)) |
1ee2c72e LC |
764 | { |
765 | c_count = scm_to_uint (count); | |
766 | if (SCM_UNLIKELY (c_start + c_count > c_len)) | |
767 | scm_out_of_range (FUNC_NAME, count); | |
768 | } | |
769 | else | |
770 | { | |
771 | if (SCM_UNLIKELY (c_start >= c_len)) | |
772 | scm_out_of_range (FUNC_NAME, start); | |
773 | else | |
774 | c_count = c_len - c_start; | |
775 | } | |
776 | } | |
777 | else | |
778 | c_start = 0, c_count = c_len; | |
779 | ||
780 | scm_c_write (port, c_bv + c_start, c_count); | |
781 | ||
782 | return SCM_UNSPECIFIED; | |
783 | } | |
784 | #undef FUNC_NAME | |
785 | ||
7f6c3f8f MW |
786 | SCM_DEFINE (scm_unget_bytevector, "unget-bytevector", 2, 2, 0, |
787 | (SCM port, SCM bv, SCM start, SCM count), | |
788 | "Unget the contents of @var{bv} to @var{port}, optionally " | |
789 | "starting at index @var{start} and limiting to @var{count} " | |
790 | "octets.") | |
791 | #define FUNC_NAME s_scm_unget_bytevector | |
792 | { | |
793 | unsigned char *c_bv; | |
794 | size_t c_start, c_count, c_len; | |
795 | ||
796 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
797 | SCM_VALIDATE_BYTEVECTOR (2, bv); | |
798 | ||
799 | c_len = SCM_BYTEVECTOR_LENGTH (bv); | |
800 | c_bv = (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
801 | ||
802 | if (!scm_is_eq (start, SCM_UNDEFINED)) | |
803 | { | |
804 | c_start = scm_to_size_t (start); | |
805 | ||
806 | if (!scm_is_eq (count, SCM_UNDEFINED)) | |
807 | { | |
808 | c_count = scm_to_size_t (count); | |
809 | if (SCM_UNLIKELY (c_start + c_count > c_len)) | |
810 | scm_out_of_range (FUNC_NAME, count); | |
811 | } | |
812 | else | |
813 | { | |
814 | if (SCM_UNLIKELY (c_start >= c_len)) | |
815 | scm_out_of_range (FUNC_NAME, start); | |
816 | else | |
817 | c_count = c_len - c_start; | |
818 | } | |
819 | } | |
820 | else | |
821 | c_start = 0, c_count = c_len; | |
822 | ||
823 | scm_unget_bytes (c_bv + c_start, c_count, port); | |
824 | ||
825 | return SCM_UNSPECIFIED; | |
826 | } | |
827 | #undef FUNC_NAME | |
828 | ||
1ee2c72e LC |
829 | |
830 | \f | |
831 | /* Bytevector output port ("bop" for short). */ | |
832 | ||
833 | /* Implementation of "bops". | |
834 | ||
835 | Each bop has an internal buffer, of type `scm_t_bop_buffer', attached to | |
836 | it. The procedure returned along with the output port is actually an | |
837 | applicable SMOB. The SMOB holds a reference to the port. When applied, | |
838 | the SMOB swallows the port's internal buffer, turning it into a | |
839 | bytevector, and resets it. | |
840 | ||
841 | XXX: Access to a bop's internal buffer is not thread-safe. */ | |
842 | ||
843 | static scm_t_bits bytevector_output_port_type = 0; | |
844 | ||
845 | SCM_SMOB (bytevector_output_port_procedure, | |
846 | "r6rs-bytevector-output-port-procedure", | |
847 | 0); | |
848 | ||
849 | #define SCM_GC_BOP "r6rs-bytevector-output-port" | |
850 | #define SCM_BOP_BUFFER_INITIAL_SIZE 4096 | |
851 | ||
852 | /* Representation of a bop's internal buffer. */ | |
853 | typedef struct | |
854 | { | |
855 | size_t total_len; | |
856 | size_t len; | |
857 | size_t pos; | |
858 | char *buffer; | |
859 | } scm_t_bop_buffer; | |
860 | ||
861 | ||
862 | /* Accessing a bop's buffer. */ | |
863 | #define SCM_BOP_BUFFER(_port) \ | |
864 | ((scm_t_bop_buffer *) SCM_STREAM (_port)) | |
865 | #define SCM_SET_BOP_BUFFER(_port, _buf) \ | |
866 | (SCM_SETSTREAM ((_port), (scm_t_bits) (_buf))) | |
867 | ||
868 | ||
869 | static inline void | |
870 | bop_buffer_init (scm_t_bop_buffer *buf) | |
871 | { | |
872 | buf->total_len = buf->len = buf->pos = 0; | |
873 | buf->buffer = NULL; | |
874 | } | |
875 | ||
876 | static inline void | |
877 | bop_buffer_grow (scm_t_bop_buffer *buf, size_t min_size) | |
878 | { | |
879 | char *new_buf; | |
880 | size_t new_size; | |
881 | ||
882 | for (new_size = buf->total_len | |
883 | ? buf->total_len : SCM_BOP_BUFFER_INITIAL_SIZE; | |
884 | new_size < min_size; | |
885 | new_size *= 2); | |
886 | ||
887 | if (buf->buffer) | |
888 | new_buf = scm_gc_realloc ((void *) buf->buffer, buf->total_len, | |
889 | new_size, SCM_GC_BOP); | |
890 | else | |
05762e72 | 891 | new_buf = scm_gc_malloc_pointerless (new_size, SCM_GC_BOP); |
1ee2c72e LC |
892 | |
893 | buf->buffer = new_buf; | |
894 | buf->total_len = new_size; | |
895 | } | |
896 | ||
897 | static inline SCM | |
898 | make_bop (void) | |
899 | { | |
900 | SCM port, bop_proc; | |
901 | scm_t_port *c_port; | |
902 | scm_t_bop_buffer *buf; | |
903 | const unsigned long mode_bits = SCM_OPN | SCM_WRTNG; | |
904 | ||
a653d32a AR |
905 | scm_i_pthread_mutex_lock (&scm_i_port_table_mutex); |
906 | ||
1ee2c72e | 907 | port = scm_new_port_table_entry (bytevector_output_port_type); |
96128014 LC |
908 | c_port = SCM_PTAB_ENTRY (port); |
909 | ||
910 | /* Match the expectation of `binary-port?'. */ | |
911 | c_port->encoding = NULL; | |
1ee2c72e LC |
912 | |
913 | buf = (scm_t_bop_buffer *) scm_gc_malloc (sizeof (* buf), SCM_GC_BOP); | |
914 | bop_buffer_init (buf); | |
915 | ||
1ee2c72e LC |
916 | c_port->write_buf = c_port->write_pos = c_port->write_end = NULL; |
917 | c_port->write_buf_size = 0; | |
918 | ||
919 | SCM_SET_BOP_BUFFER (port, buf); | |
920 | ||
921 | /* Mark PORT as open and writable. */ | |
922 | SCM_SET_CELL_TYPE (port, bytevector_output_port_type | mode_bits); | |
923 | ||
a653d32a AR |
924 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
925 | ||
1ee2c72e | 926 | /* Make the bop procedure. */ |
a653d32a | 927 | SCM_NEWSMOB (bop_proc, bytevector_output_port_procedure, buf); |
1ee2c72e LC |
928 | |
929 | return (scm_values (scm_list_2 (port, bop_proc))); | |
930 | } | |
931 | ||
1ee2c72e LC |
932 | /* Write SIZE octets from DATA to PORT. */ |
933 | static void | |
934 | bop_write (SCM port, const void *data, size_t size) | |
935 | { | |
936 | scm_t_bop_buffer *buf; | |
937 | ||
938 | buf = SCM_BOP_BUFFER (port); | |
939 | ||
940 | if (buf->pos + size > buf->total_len) | |
941 | bop_buffer_grow (buf, buf->pos + size); | |
942 | ||
943 | memcpy (buf->buffer + buf->pos, data, size); | |
944 | buf->pos += size; | |
945 | buf->len = (buf->len > buf->pos) ? buf->len : buf->pos; | |
946 | } | |
947 | ||
f1ce9199 LC |
948 | static scm_t_off |
949 | bop_seek (SCM port, scm_t_off offset, int whence) | |
1ee2c72e LC |
950 | #define FUNC_NAME "bop_seek" |
951 | { | |
952 | scm_t_bop_buffer *buf; | |
953 | ||
954 | buf = SCM_BOP_BUFFER (port); | |
955 | switch (whence) | |
956 | { | |
957 | case SEEK_CUR: | |
f1ce9199 | 958 | offset += (scm_t_off) buf->pos; |
1ee2c72e LC |
959 | /* Fall through. */ |
960 | ||
961 | case SEEK_SET: | |
962 | if (offset < 0 || (unsigned) offset > buf->len) | |
963 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); | |
964 | else | |
965 | buf->pos = offset; | |
966 | break; | |
967 | ||
968 | case SEEK_END: | |
969 | if (offset < 0 || (unsigned) offset >= buf->len) | |
970 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); | |
971 | else | |
972 | buf->pos = buf->len - (offset + 1); | |
973 | break; | |
974 | ||
975 | default: | |
976 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
977 | "invalid `seek' parameter"); | |
978 | } | |
979 | ||
980 | return buf->pos; | |
981 | } | |
982 | #undef FUNC_NAME | |
983 | ||
984 | /* Fetch data from a bop. */ | |
985 | SCM_SMOB_APPLY (bytevector_output_port_procedure, | |
986 | bop_proc_apply, 0, 0, 0, (SCM bop_proc)) | |
987 | { | |
a653d32a | 988 | SCM bv; |
1ee2c72e LC |
989 | scm_t_bop_buffer *buf, result_buf; |
990 | ||
a653d32a | 991 | buf = (scm_t_bop_buffer *) SCM_SMOB_DATA (bop_proc); |
1ee2c72e LC |
992 | |
993 | result_buf = *buf; | |
994 | bop_buffer_init (buf); | |
995 | ||
996 | if (result_buf.len == 0) | |
fb031aba | 997 | bv = scm_c_take_gc_bytevector (NULL, 0); |
1ee2c72e LC |
998 | else |
999 | { | |
1000 | if (result_buf.total_len > result_buf.len) | |
1001 | /* Shrink the buffer. */ | |
1002 | result_buf.buffer = scm_gc_realloc ((void *) result_buf.buffer, | |
1003 | result_buf.total_len, | |
1004 | result_buf.len, | |
1005 | SCM_GC_BOP); | |
1006 | ||
fb031aba AW |
1007 | bv = scm_c_take_gc_bytevector ((signed char *) result_buf.buffer, |
1008 | result_buf.len); | |
1ee2c72e LC |
1009 | } |
1010 | ||
1011 | return bv; | |
1012 | } | |
1013 | ||
1ee2c72e LC |
1014 | SCM_DEFINE (scm_open_bytevector_output_port, |
1015 | "open-bytevector-output-port", 0, 1, 0, | |
1016 | (SCM transcoder), | |
1017 | "Return two values: an output port and a procedure. The latter " | |
1018 | "should be called with zero arguments to obtain a bytevector " | |
1019 | "containing the data accumulated by the port.") | |
1020 | #define FUNC_NAME s_scm_open_bytevector_output_port | |
1021 | { | |
1022 | if (!SCM_UNBNDP (transcoder) && !scm_is_false (transcoder)) | |
1023 | transcoders_not_implemented (); | |
1024 | ||
1025 | return (make_bop ()); | |
1026 | } | |
1027 | #undef FUNC_NAME | |
1028 | ||
1029 | static inline void | |
1030 | initialize_bytevector_output_ports (void) | |
1031 | { | |
1032 | bytevector_output_port_type = | |
1033 | scm_make_port_type ("r6rs-bytevector-output-port", | |
1034 | NULL, bop_write); | |
1035 | ||
1036 | scm_set_port_seek (bytevector_output_port_type, bop_seek); | |
1ee2c72e LC |
1037 | } |
1038 | ||
1039 | \f | |
1040 | /* Custom binary output port ("cbop" for short). */ | |
1041 | ||
1042 | static scm_t_bits custom_binary_output_port_type; | |
1043 | ||
1044 | /* Return the various procedures of PORT. */ | |
1045 | #define SCM_CBOP_WRITE_PROC(_port) \ | |
1046 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 0) | |
1047 | ||
1048 | ||
1049 | static inline SCM | |
1050 | make_cbop (SCM write_proc, SCM get_position_proc, | |
1051 | SCM set_position_proc, SCM close_proc) | |
1052 | { | |
1053 | SCM port, method_vector; | |
1054 | scm_t_port *c_port; | |
1055 | const unsigned long mode_bits = SCM_OPN | SCM_WRTNG; | |
1056 | ||
1057 | /* Store the various methods and bytevector in a vector. */ | |
1058 | method_vector = scm_c_make_vector (4, SCM_BOOL_F); | |
1059 | SCM_SIMPLE_VECTOR_SET (method_vector, 0, write_proc); | |
1060 | SCM_SIMPLE_VECTOR_SET (method_vector, 1, get_position_proc); | |
1061 | SCM_SIMPLE_VECTOR_SET (method_vector, 2, set_position_proc); | |
1062 | SCM_SIMPLE_VECTOR_SET (method_vector, 3, close_proc); | |
1063 | ||
a653d32a AR |
1064 | scm_i_pthread_mutex_lock (&scm_i_port_table_mutex); |
1065 | ||
1ee2c72e | 1066 | port = scm_new_port_table_entry (custom_binary_output_port_type); |
96128014 LC |
1067 | c_port = SCM_PTAB_ENTRY (port); |
1068 | ||
1069 | /* Match the expectation of `binary-port?'. */ | |
1070 | c_port->encoding = NULL; | |
1ee2c72e LC |
1071 | |
1072 | /* Attach it the method vector. */ | |
1073 | SCM_SETSTREAM (port, SCM_UNPACK (method_vector)); | |
1074 | ||
1075 | /* Have the port directly access the buffer (bytevector). */ | |
1ee2c72e LC |
1076 | c_port->write_buf = c_port->write_pos = c_port->write_end = NULL; |
1077 | c_port->write_buf_size = c_port->read_buf_size = 0; | |
1078 | ||
1079 | /* Mark PORT as open, writable and unbuffered. */ | |
1080 | SCM_SET_CELL_TYPE (port, custom_binary_output_port_type | mode_bits); | |
1081 | ||
a653d32a AR |
1082 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
1083 | ||
1ee2c72e LC |
1084 | return port; |
1085 | } | |
1086 | ||
1087 | /* Write SIZE octets from DATA to PORT. */ | |
1088 | static void | |
1089 | cbop_write (SCM port, const void *data, size_t size) | |
1090 | #define FUNC_NAME "cbop_write" | |
1091 | { | |
1092 | long int c_result; | |
1093 | size_t c_written; | |
1094 | SCM bv, write_proc, result; | |
1095 | ||
1096 | /* XXX: Allocating a new bytevector at each `write' call is inefficient, | |
1097 | but necessary since (1) we don't control the lifetime of the buffer | |
1098 | pointed to by DATA, and (2) the `write!' procedure could capture the | |
1099 | bytevector it is passed. */ | |
1100 | bv = scm_c_make_bytevector (size); | |
1101 | memcpy (SCM_BYTEVECTOR_CONTENTS (bv), data, size); | |
1102 | ||
1103 | write_proc = SCM_CBOP_WRITE_PROC (port); | |
1104 | ||
1105 | /* Since the `write' procedure of Guile's ports has type `void', it must | |
1106 | try hard to write exactly SIZE bytes, regardless of how many bytes the | |
1107 | sink can handle. */ | |
1108 | for (c_written = 0; | |
1109 | c_written < size; | |
1110 | c_written += c_result) | |
1111 | { | |
1112 | result = scm_call_3 (write_proc, bv, | |
1113 | scm_from_size_t (c_written), | |
1114 | scm_from_size_t (size - c_written)); | |
1115 | ||
1116 | c_result = scm_to_long (result); | |
1117 | if (SCM_UNLIKELY (c_result < 0 | |
1118 | || (size_t) c_result > (size - c_written))) | |
1119 | scm_wrong_type_arg_msg (FUNC_NAME, 0, result, | |
1120 | "R6RS custom binary output port `write!' " | |
1121 | "returned a incorrect integer"); | |
1122 | } | |
1123 | } | |
1124 | #undef FUNC_NAME | |
1125 | ||
1126 | ||
1127 | SCM_DEFINE (scm_make_custom_binary_output_port, | |
1128 | "make-custom-binary-output-port", 5, 0, 0, | |
1129 | (SCM id, SCM write_proc, SCM get_position_proc, | |
1130 | SCM set_position_proc, SCM close_proc), | |
1131 | "Return a new custom binary output port whose output is drained " | |
1132 | "by invoking @var{write_proc} and passing it a bytevector, an " | |
1133 | "index where octets should be written, and an octet count.") | |
1134 | #define FUNC_NAME s_scm_make_custom_binary_output_port | |
1135 | { | |
1136 | SCM_VALIDATE_STRING (1, id); | |
1137 | SCM_VALIDATE_PROC (2, write_proc); | |
1138 | ||
1139 | if (!scm_is_false (get_position_proc)) | |
1140 | SCM_VALIDATE_PROC (3, get_position_proc); | |
1141 | ||
1142 | if (!scm_is_false (set_position_proc)) | |
1143 | SCM_VALIDATE_PROC (4, set_position_proc); | |
1144 | ||
1145 | if (!scm_is_false (close_proc)) | |
1146 | SCM_VALIDATE_PROC (5, close_proc); | |
1147 | ||
1148 | return (make_cbop (write_proc, get_position_proc, set_position_proc, | |
1149 | close_proc)); | |
1150 | } | |
1151 | #undef FUNC_NAME | |
1152 | ||
1153 | ||
1154 | /* Instantiate the custom binary output port type. */ | |
1155 | static inline void | |
1156 | initialize_custom_binary_output_ports (void) | |
1157 | { | |
1158 | custom_binary_output_port_type = | |
1159 | scm_make_port_type ("r6rs-custom-binary-output-port", | |
1160 | NULL, cbop_write); | |
1161 | ||
1ee2c72e LC |
1162 | scm_set_port_seek (custom_binary_output_port_type, cbp_seek); |
1163 | scm_set_port_close (custom_binary_output_port_type, cbp_close); | |
1164 | } | |
1165 | ||
1166 | \f | |
1044537d AR |
1167 | /* Transcoded ports ("tp" for short). */ |
1168 | static scm_t_bits transcoded_port_type = 0; | |
1169 | ||
1170 | #define TP_INPUT_BUFFER_SIZE 4096 | |
1171 | ||
1172 | #define SCM_TP_BINARY_PORT(_port) SCM_PACK (SCM_STREAM (_port)) | |
1173 | ||
1174 | static inline SCM | |
1175 | make_tp (SCM binary_port, unsigned long mode) | |
1176 | { | |
1177 | SCM port; | |
1178 | scm_t_port *c_port; | |
1179 | const unsigned long mode_bits = SCM_OPN | mode; | |
1180 | ||
1181 | scm_i_pthread_mutex_lock (&scm_i_port_table_mutex); | |
1182 | ||
1183 | port = scm_new_port_table_entry (transcoded_port_type); | |
1184 | ||
1185 | SCM_SETSTREAM (port, SCM_UNPACK (binary_port)); | |
1186 | ||
1187 | SCM_SET_CELL_TYPE (port, transcoded_port_type | mode_bits); | |
1188 | ||
1189 | if (SCM_INPUT_PORT_P (port)) | |
1190 | { | |
1191 | c_port = SCM_PTAB_ENTRY (port); | |
1192 | c_port->read_buf = scm_gc_malloc_pointerless (TP_INPUT_BUFFER_SIZE, | |
1193 | "port buffer"); | |
1194 | c_port->read_pos = c_port->read_end = c_port->read_buf; | |
1195 | c_port->read_buf_size = TP_INPUT_BUFFER_SIZE; | |
1196 | ||
1197 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0); | |
1198 | } | |
1199 | ||
1200 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); | |
1201 | ||
1202 | return port; | |
1203 | } | |
1204 | ||
1205 | static void | |
1206 | tp_write (SCM port, const void *data, size_t size) | |
1207 | { | |
1208 | scm_c_write (SCM_TP_BINARY_PORT (port), data, size); | |
1209 | } | |
1210 | ||
1211 | static int | |
1212 | tp_fill_input (SCM port) | |
1213 | { | |
1214 | size_t count; | |
1215 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); | |
1216 | SCM bport = SCM_TP_BINARY_PORT (port); | |
1217 | scm_t_port *c_bport = SCM_PTAB_ENTRY (bport); | |
1218 | ||
1219 | /* We can't use `scm_c_read' here, since it blocks until the whole | |
1220 | block has been read or EOF. */ | |
1221 | ||
1222 | if (c_bport->rw_active == SCM_PORT_WRITE) | |
1223 | scm_force_output (bport); | |
1224 | ||
1225 | if (c_bport->read_pos >= c_bport->read_end) | |
1226 | scm_fill_input (bport); | |
1227 | ||
1228 | count = c_bport->read_end - c_bport->read_pos; | |
1229 | if (count > c_port->read_buf_size) | |
1230 | count = c_port->read_buf_size; | |
1231 | ||
1232 | memcpy (c_port->read_buf, c_bport->read_pos, count); | |
1233 | c_bport->read_pos += count; | |
1234 | ||
1235 | if (c_bport->rw_random) | |
1236 | c_bport->rw_active = SCM_PORT_READ; | |
1237 | ||
1238 | if (count == 0) | |
1239 | return EOF; | |
1240 | else | |
1241 | { | |
1242 | c_port->read_pos = c_port->read_buf; | |
1243 | c_port->read_end = c_port->read_buf + count; | |
1244 | return *c_port->read_buf; | |
1245 | } | |
1246 | } | |
1247 | ||
1248 | static void | |
1249 | tp_flush (SCM port) | |
1250 | { | |
1251 | SCM binary_port = SCM_TP_BINARY_PORT (port); | |
1252 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); | |
1253 | size_t count = c_port->write_pos - c_port->write_buf; | |
1254 | ||
dfb572a7 AR |
1255 | /* As the runtime will try to flush all ports upon exit, we test for |
1256 | the underlying port still being open here. Otherwise, when you | |
1257 | would explicitly close the underlying port and the transcoded port | |
1258 | still had data outstanding, you'd get an exception on Guile exit. | |
1259 | ||
1260 | We just throw away the data when the underlying port is closed. */ | |
1261 | ||
1262 | if (SCM_OPOUTPORTP (binary_port)) | |
1263 | scm_c_write (binary_port, c_port->write_buf, count); | |
1044537d AR |
1264 | |
1265 | c_port->write_pos = c_port->write_buf; | |
1266 | c_port->rw_active = SCM_PORT_NEITHER; | |
1267 | ||
dfb572a7 AR |
1268 | if (SCM_OPOUTPORTP (binary_port)) |
1269 | scm_force_output (binary_port); | |
1044537d AR |
1270 | } |
1271 | ||
1272 | static int | |
1273 | tp_close (SCM port) | |
1274 | { | |
1275 | if (SCM_OUTPUT_PORT_P (port)) | |
1276 | tp_flush (port); | |
1277 | return scm_is_true (scm_close_port (SCM_TP_BINARY_PORT (port))) ? 0 : -1; | |
1278 | } | |
1279 | ||
1280 | static inline void | |
1281 | initialize_transcoded_ports (void) | |
1282 | { | |
1283 | transcoded_port_type = | |
1284 | scm_make_port_type ("r6rs-transcoded-port", tp_fill_input, tp_write); | |
1285 | ||
1286 | scm_set_port_flush (transcoded_port_type, tp_flush); | |
1287 | scm_set_port_close (transcoded_port_type, tp_close); | |
1288 | } | |
1289 | ||
1290 | SCM_DEFINE (scm_i_make_transcoded_port, | |
1291 | "%make-transcoded-port", 1, 0, 0, | |
1292 | (SCM port), | |
1293 | "Return a new port which reads and writes to @var{port}") | |
1294 | #define FUNC_NAME s_scm_i_make_transcoded_port | |
1295 | { | |
1296 | SCM result; | |
1297 | unsigned long mode = 0; | |
1298 | ||
1299 | SCM_VALIDATE_PORT (SCM_ARG1, port); | |
1300 | ||
1301 | if (scm_is_true (scm_output_port_p (port))) | |
1302 | mode |= SCM_WRTNG; | |
1303 | else if (scm_is_true (scm_input_port_p (port))) | |
1304 | mode |= SCM_RDNG; | |
1305 | ||
1306 | result = make_tp (port, mode); | |
1307 | ||
1308 | /* FIXME: We should actually close `port' "in a special way" here, | |
1309 | according to R6RS. As there is no way to do that in Guile without | |
1310 | rendering the underlying port unusable for our purposes as well, we | |
1311 | just leave it open. */ | |
1312 | ||
1313 | return result; | |
1314 | } | |
1315 | #undef FUNC_NAME | |
1316 | ||
1317 | \f | |
a6c377f7 AR |
1318 | /* Textual I/O */ |
1319 | ||
1320 | SCM_DEFINE (scm_get_string_n_x, | |
1321 | "get-string-n!", 4, 0, 0, | |
1322 | (SCM port, SCM str, SCM start, SCM count), | |
1323 | "Read up to @var{count} characters from @var{port} into " | |
1324 | "@var{str}, starting at @var{start}. If no characters " | |
1325 | "can be read before the end of file is encountered, the end " | |
1326 | "of file object is returned. Otherwise, the number of " | |
1327 | "characters read is returned.") | |
1328 | #define FUNC_NAME s_scm_get_string_n_x | |
1329 | { | |
1330 | size_t c_start, c_count, c_len, c_end, j; | |
1331 | scm_t_wchar c; | |
1332 | ||
1333 | SCM_VALIDATE_OPINPORT (1, port); | |
1334 | SCM_VALIDATE_STRING (2, str); | |
1335 | c_len = scm_c_string_length (str); | |
1336 | c_start = scm_to_size_t (start); | |
1337 | c_count = scm_to_size_t (count); | |
1338 | c_end = c_start + c_count; | |
1339 | ||
1340 | if (SCM_UNLIKELY (c_end > c_len)) | |
1341 | scm_out_of_range (FUNC_NAME, count); | |
1342 | ||
1343 | for (j = c_start; j < c_end; j++) | |
1344 | { | |
1345 | c = scm_getc (port); | |
1346 | if (c == EOF) | |
1347 | { | |
1348 | size_t chars_read = j - c_start; | |
1349 | return chars_read == 0 ? SCM_EOF_VAL : scm_from_size_t (chars_read); | |
1350 | } | |
1351 | scm_c_string_set_x (str, j, SCM_MAKE_CHAR (c)); | |
1352 | } | |
1353 | return count; | |
1354 | } | |
1355 | #undef FUNC_NAME | |
1356 | ||
1357 | \f | |
1ee2c72e LC |
1358 | /* Initialization. */ |
1359 | ||
c0062328 LC |
1360 | void |
1361 | scm_register_r6rs_ports (void) | |
1362 | { | |
1363 | scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION, | |
1364 | "scm_init_r6rs_ports", | |
1365 | (scm_t_extension_init_func) scm_init_r6rs_ports, | |
1366 | NULL); | |
1367 | } | |
1368 | ||
1ee2c72e LC |
1369 | void |
1370 | scm_init_r6rs_ports (void) | |
1371 | { | |
62e9a9b7 | 1372 | #include "libguile/r6rs-ports.x" |
1ee2c72e LC |
1373 | |
1374 | initialize_bytevector_input_ports (); | |
1375 | initialize_custom_binary_input_ports (); | |
1376 | initialize_bytevector_output_ports (); | |
1377 | initialize_custom_binary_output_ports (); | |
1044537d | 1378 | initialize_transcoded_ports (); |
1ee2c72e | 1379 | } |