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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" | |
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 | ||
2721f918 AW |
87 | port = scm_c_make_port_with_encoding (bytevector_input_port_type, |
88 | mode_bits, | |
89 | NULL, /* encoding */ | |
90 | SCM_FAILED_CONVERSION_ERROR, | |
91 | SCM_UNPACK (bv)); | |
a653d32a | 92 | |
96128014 LC |
93 | c_port = SCM_PTAB_ENTRY (port); |
94 | ||
1ee2c72e LC |
95 | /* Have the port directly access the bytevector. */ |
96 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
97 | c_len = SCM_BYTEVECTOR_LENGTH (bv); | |
98 | ||
1ee2c72e LC |
99 | c_port->read_pos = c_port->read_buf = (unsigned char *) c_bv; |
100 | c_port->read_end = (unsigned char *) c_bv + c_len; | |
101 | c_port->read_buf_size = c_len; | |
102 | ||
1ee2c72e LC |
103 | return port; |
104 | } | |
105 | ||
1ee2c72e LC |
106 | static int |
107 | bip_fill_input (SCM port) | |
108 | { | |
109 | int result; | |
110 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); | |
111 | ||
112 | if (c_port->read_pos >= c_port->read_end) | |
113 | result = EOF; | |
114 | else | |
115 | result = (int) *c_port->read_pos; | |
116 | ||
117 | return result; | |
118 | } | |
119 | ||
f1ce9199 LC |
120 | static scm_t_off |
121 | bip_seek (SCM port, scm_t_off offset, int whence) | |
1ee2c72e LC |
122 | #define FUNC_NAME "bip_seek" |
123 | { | |
f1ce9199 | 124 | scm_t_off c_result = 0; |
1ee2c72e LC |
125 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); |
126 | ||
127 | switch (whence) | |
128 | { | |
129 | case SEEK_CUR: | |
130 | offset += c_port->read_pos - c_port->read_buf; | |
131 | /* Fall through. */ | |
132 | ||
133 | case SEEK_SET: | |
c89b4529 | 134 | if (c_port->read_buf + offset <= c_port->read_end) |
1ee2c72e LC |
135 | { |
136 | c_port->read_pos = c_port->read_buf + offset; | |
137 | c_result = offset; | |
138 | } | |
139 | else | |
140 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); | |
141 | break; | |
142 | ||
143 | case SEEK_END: | |
144 | if (c_port->read_end - offset >= c_port->read_buf) | |
145 | { | |
146 | c_port->read_pos = c_port->read_end - offset; | |
147 | c_result = c_port->read_pos - c_port->read_buf; | |
148 | } | |
149 | else | |
150 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); | |
151 | break; | |
152 | ||
153 | default: | |
154 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
155 | "invalid `seek' parameter"); | |
156 | } | |
157 | ||
158 | return c_result; | |
159 | } | |
160 | #undef FUNC_NAME | |
161 | ||
162 | ||
163 | /* Instantiate the bytevector input port type. */ | |
164 | static inline void | |
165 | initialize_bytevector_input_ports (void) | |
166 | { | |
167 | bytevector_input_port_type = | |
168 | scm_make_port_type ("r6rs-bytevector-input-port", bip_fill_input, | |
169 | NULL); | |
170 | ||
1ee2c72e LC |
171 | scm_set_port_seek (bytevector_input_port_type, bip_seek); |
172 | } | |
173 | ||
174 | ||
175 | SCM_DEFINE (scm_open_bytevector_input_port, | |
176 | "open-bytevector-input-port", 1, 1, 0, | |
177 | (SCM bv, SCM transcoder), | |
178 | "Return an input port whose contents are drawn from " | |
179 | "bytevector @var{bv}.") | |
180 | #define FUNC_NAME s_scm_open_bytevector_input_port | |
181 | { | |
182 | SCM_VALIDATE_BYTEVECTOR (1, bv); | |
183 | if (!SCM_UNBNDP (transcoder) && !scm_is_false (transcoder)) | |
184 | transcoders_not_implemented (); | |
185 | ||
186 | return (make_bip (bv)); | |
187 | } | |
188 | #undef FUNC_NAME | |
189 | ||
190 | \f | |
191 | /* Custom binary ports. The following routines are shared by input and | |
192 | output custom binary ports. */ | |
193 | ||
194 | #define SCM_CBP_GET_POSITION_PROC(_port) \ | |
195 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 1) | |
196 | #define SCM_CBP_SET_POSITION_PROC(_port) \ | |
197 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 2) | |
198 | #define SCM_CBP_CLOSE_PROC(_port) \ | |
199 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 3) | |
200 | ||
f1ce9199 LC |
201 | static scm_t_off |
202 | cbp_seek (SCM port, scm_t_off offset, int whence) | |
1ee2c72e LC |
203 | #define FUNC_NAME "cbp_seek" |
204 | { | |
205 | SCM result; | |
f1ce9199 | 206 | scm_t_off c_result = 0; |
1ee2c72e LC |
207 | |
208 | switch (whence) | |
209 | { | |
210 | case SEEK_CUR: | |
211 | { | |
212 | SCM get_position_proc; | |
213 | ||
214 | get_position_proc = SCM_CBP_GET_POSITION_PROC (port); | |
215 | if (SCM_LIKELY (scm_is_true (get_position_proc))) | |
216 | result = scm_call_0 (get_position_proc); | |
217 | else | |
218 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
c9d55a7e LC |
219 | "R6RS custom binary port with " |
220 | "`port-position' support"); | |
221 | c_result = scm_to_int (result); | |
222 | if (offset == 0) | |
223 | /* We just want to know the current position. */ | |
224 | break; | |
225 | ||
226 | offset += c_result; | |
1ee2c72e LC |
227 | /* Fall through. */ |
228 | } | |
229 | ||
230 | case SEEK_SET: | |
231 | { | |
232 | SCM set_position_proc; | |
233 | ||
234 | set_position_proc = SCM_CBP_SET_POSITION_PROC (port); | |
235 | if (SCM_LIKELY (scm_is_true (set_position_proc))) | |
236 | result = scm_call_1 (set_position_proc, scm_from_int (offset)); | |
237 | else | |
238 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
c9d55a7e | 239 | "seekable R6RS custom binary port"); |
1ee2c72e LC |
240 | |
241 | /* Assuming setting the position succeeded. */ | |
242 | c_result = offset; | |
243 | break; | |
244 | } | |
245 | ||
246 | default: | |
247 | /* `SEEK_END' cannot be supported. */ | |
248 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
249 | "R6RS custom binary ports do not " | |
250 | "support `SEEK_END'"); | |
251 | } | |
252 | ||
253 | return c_result; | |
254 | } | |
255 | #undef FUNC_NAME | |
256 | ||
257 | static int | |
258 | cbp_close (SCM port) | |
259 | { | |
260 | SCM close_proc; | |
261 | ||
262 | close_proc = SCM_CBP_CLOSE_PROC (port); | |
263 | if (scm_is_true (close_proc)) | |
264 | /* Invoke the `close' thunk. */ | |
265 | scm_call_0 (close_proc); | |
266 | ||
267 | return 1; | |
268 | } | |
269 | ||
270 | \f | |
271 | /* Custom binary input port ("cbip" for short). */ | |
272 | ||
273 | static scm_t_bits custom_binary_input_port_type = 0; | |
274 | ||
275 | /* Size of the buffer embedded in custom binary input ports. */ | |
276 | #define CBIP_BUFFER_SIZE 4096 | |
277 | ||
278 | /* Return the bytevector associated with PORT. */ | |
279 | #define SCM_CBIP_BYTEVECTOR(_port) \ | |
280 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 4) | |
281 | ||
282 | /* Return the various procedures of PORT. */ | |
283 | #define SCM_CBIP_READ_PROC(_port) \ | |
284 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 0) | |
285 | ||
286 | ||
287 | static inline SCM | |
288 | make_cbip (SCM read_proc, SCM get_position_proc, | |
289 | SCM set_position_proc, SCM close_proc) | |
290 | { | |
291 | SCM port, bv, method_vector; | |
292 | char *c_bv; | |
293 | unsigned c_len; | |
294 | scm_t_port *c_port; | |
295 | const unsigned long mode_bits = SCM_OPN | SCM_RDNG; | |
296 | ||
297 | /* Use a bytevector as the underlying buffer. */ | |
298 | c_len = CBIP_BUFFER_SIZE; | |
299 | bv = scm_c_make_bytevector (c_len); | |
300 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
301 | ||
302 | /* Store the various methods and bytevector in a vector. */ | |
303 | method_vector = scm_c_make_vector (5, SCM_BOOL_F); | |
304 | SCM_SIMPLE_VECTOR_SET (method_vector, 4, bv); | |
305 | SCM_SIMPLE_VECTOR_SET (method_vector, 0, read_proc); | |
306 | SCM_SIMPLE_VECTOR_SET (method_vector, 1, get_position_proc); | |
307 | SCM_SIMPLE_VECTOR_SET (method_vector, 2, set_position_proc); | |
308 | SCM_SIMPLE_VECTOR_SET (method_vector, 3, close_proc); | |
309 | ||
2721f918 AW |
310 | port = scm_c_make_port_with_encoding (custom_binary_input_port_type, |
311 | mode_bits, | |
312 | NULL, /* encoding */ | |
313 | SCM_FAILED_CONVERSION_ERROR, | |
314 | SCM_UNPACK (method_vector)); | |
a653d32a | 315 | |
96128014 LC |
316 | c_port = SCM_PTAB_ENTRY (port); |
317 | ||
1ee2c72e | 318 | /* Have the port directly access the buffer (bytevector). */ |
1ee2c72e LC |
319 | c_port->read_pos = c_port->read_buf = (unsigned char *) c_bv; |
320 | c_port->read_end = (unsigned char *) c_bv; | |
321 | c_port->read_buf_size = c_len; | |
322 | ||
1ee2c72e LC |
323 | return port; |
324 | } | |
325 | ||
326 | static int | |
327 | cbip_fill_input (SCM port) | |
328 | #define FUNC_NAME "cbip_fill_input" | |
329 | { | |
330 | int result; | |
331 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); | |
332 | ||
333 | again: | |
334 | if (c_port->read_pos >= c_port->read_end) | |
335 | { | |
336 | /* Invoke the user's `read!' procedure. */ | |
6df03222 | 337 | size_t c_octets, c_requested; |
1ee2c72e LC |
338 | SCM bv, read_proc, octets; |
339 | ||
6df03222 LC |
340 | c_requested = c_port->read_buf_size; |
341 | ||
1ee2c72e LC |
342 | /* Use the bytevector associated with PORT as the buffer passed to the |
343 | `read!' procedure, thereby avoiding additional allocations. */ | |
344 | bv = SCM_CBIP_BYTEVECTOR (port); | |
345 | read_proc = SCM_CBIP_READ_PROC (port); | |
346 | ||
347 | /* The assumption here is that C_PORT's internal buffer wasn't changed | |
348 | behind our back. */ | |
349 | assert (c_port->read_buf == | |
350 | (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv)); | |
351 | assert ((unsigned) c_port->read_buf_size | |
352 | == SCM_BYTEVECTOR_LENGTH (bv)); | |
353 | ||
354 | octets = scm_call_3 (read_proc, bv, SCM_INUM0, | |
6df03222 LC |
355 | scm_from_size_t (c_requested)); |
356 | c_octets = scm_to_size_t (octets); | |
357 | if (SCM_UNLIKELY (c_octets > c_requested)) | |
358 | scm_out_of_range (FUNC_NAME, octets); | |
1ee2c72e LC |
359 | |
360 | c_port->read_pos = (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
361 | c_port->read_end = (unsigned char *) c_port->read_pos + c_octets; | |
362 | ||
363 | if (c_octets > 0) | |
364 | goto again; | |
365 | else | |
366 | result = EOF; | |
367 | } | |
368 | else | |
369 | result = (int) *c_port->read_pos; | |
370 | ||
371 | return result; | |
372 | } | |
373 | #undef FUNC_NAME | |
374 | ||
375 | ||
376 | SCM_DEFINE (scm_make_custom_binary_input_port, | |
377 | "make-custom-binary-input-port", 5, 0, 0, | |
378 | (SCM id, SCM read_proc, SCM get_position_proc, | |
379 | SCM set_position_proc, SCM close_proc), | |
380 | "Return a new custom binary input port whose input is drained " | |
381 | "by invoking @var{read_proc} and passing it a bytevector, an " | |
382 | "index where octets should be written, and an octet count.") | |
383 | #define FUNC_NAME s_scm_make_custom_binary_input_port | |
384 | { | |
385 | SCM_VALIDATE_STRING (1, id); | |
386 | SCM_VALIDATE_PROC (2, read_proc); | |
387 | ||
388 | if (!scm_is_false (get_position_proc)) | |
389 | SCM_VALIDATE_PROC (3, get_position_proc); | |
390 | ||
391 | if (!scm_is_false (set_position_proc)) | |
392 | SCM_VALIDATE_PROC (4, set_position_proc); | |
393 | ||
394 | if (!scm_is_false (close_proc)) | |
395 | SCM_VALIDATE_PROC (5, close_proc); | |
396 | ||
397 | return (make_cbip (read_proc, get_position_proc, set_position_proc, | |
398 | close_proc)); | |
399 | } | |
400 | #undef FUNC_NAME | |
401 | ||
402 | ||
403 | /* Instantiate the custom binary input port type. */ | |
404 | static inline void | |
405 | initialize_custom_binary_input_ports (void) | |
406 | { | |
407 | custom_binary_input_port_type = | |
408 | scm_make_port_type ("r6rs-custom-binary-input-port", | |
409 | cbip_fill_input, NULL); | |
410 | ||
1ee2c72e LC |
411 | scm_set_port_seek (custom_binary_input_port_type, cbp_seek); |
412 | scm_set_port_close (custom_binary_input_port_type, cbp_close); | |
413 | } | |
414 | ||
415 | ||
416 | \f | |
417 | /* Binary input. */ | |
418 | ||
419 | /* We currently don't support specific binary input ports. */ | |
420 | #define SCM_VALIDATE_BINARY_INPUT_PORT SCM_VALIDATE_OPINPORT | |
421 | ||
422 | SCM_DEFINE (scm_get_u8, "get-u8", 1, 0, 0, | |
423 | (SCM port), | |
424 | "Read an octet from @var{port}, a binary input port, " | |
425 | "blocking as necessary.") | |
426 | #define FUNC_NAME s_scm_get_u8 | |
427 | { | |
428 | SCM result; | |
429 | int c_result; | |
430 | ||
431 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
432 | ||
8aa47f26 | 433 | c_result = scm_get_byte_or_eof (port); |
1ee2c72e LC |
434 | if (c_result == EOF) |
435 | result = SCM_EOF_VAL; | |
436 | else | |
437 | result = SCM_I_MAKINUM ((unsigned char) c_result); | |
438 | ||
439 | return result; | |
440 | } | |
441 | #undef FUNC_NAME | |
442 | ||
443 | SCM_DEFINE (scm_lookahead_u8, "lookahead-u8", 1, 0, 0, | |
444 | (SCM port), | |
445 | "Like @code{get-u8} but does not update @var{port} to " | |
446 | "point past the octet.") | |
447 | #define FUNC_NAME s_scm_lookahead_u8 | |
448 | { | |
8aa47f26 | 449 | int u8; |
1ee2c72e LC |
450 | SCM result; |
451 | ||
452 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
453 | ||
452c5ad9 | 454 | u8 = scm_peek_byte_or_eof (port); |
8aa47f26 | 455 | if (u8 == EOF) |
1ee2c72e | 456 | result = SCM_EOF_VAL; |
8aa47f26 | 457 | else |
452c5ad9 | 458 | result = SCM_I_MAKINUM ((scm_t_uint8) u8); |
1ee2c72e LC |
459 | |
460 | return result; | |
461 | } | |
462 | #undef FUNC_NAME | |
463 | ||
464 | SCM_DEFINE (scm_get_bytevector_n, "get-bytevector-n", 2, 0, 0, | |
465 | (SCM port, SCM count), | |
466 | "Read @var{count} octets from @var{port}, blocking as " | |
467 | "necessary and return a bytevector containing the octets " | |
468 | "read. If fewer bytes are available, a bytevector smaller " | |
469 | "than @var{count} is returned.") | |
470 | #define FUNC_NAME s_scm_get_bytevector_n | |
471 | { | |
472 | SCM result; | |
473 | char *c_bv; | |
474 | unsigned c_count; | |
475 | size_t c_read; | |
476 | ||
477 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
478 | c_count = scm_to_uint (count); | |
479 | ||
480 | result = scm_c_make_bytevector (c_count); | |
481 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (result); | |
482 | ||
483 | if (SCM_LIKELY (c_count > 0)) | |
484 | /* XXX: `scm_c_read ()' does not update the port position. */ | |
be632904 | 485 | c_read = scm_c_read_unlocked (port, c_bv, c_count); |
1ee2c72e LC |
486 | else |
487 | /* Don't invoke `scm_c_read ()' since it may block. */ | |
488 | c_read = 0; | |
489 | ||
47f2bce5 | 490 | if (c_read < c_count) |
1ee2c72e | 491 | { |
47f2bce5 MW |
492 | if (c_read == 0) |
493 | result = SCM_EOF_VAL; | |
1ee2c72e | 494 | else |
1ee2c72e LC |
495 | result = scm_c_shrink_bytevector (result, c_read); |
496 | } | |
497 | ||
498 | return result; | |
499 | } | |
500 | #undef FUNC_NAME | |
501 | ||
502 | SCM_DEFINE (scm_get_bytevector_n_x, "get-bytevector-n!", 4, 0, 0, | |
503 | (SCM port, SCM bv, SCM start, SCM count), | |
504 | "Read @var{count} bytes from @var{port} and store them " | |
505 | "in @var{bv} starting at index @var{start}. Return either " | |
506 | "the number of bytes actually read or the end-of-file " | |
507 | "object.") | |
508 | #define FUNC_NAME s_scm_get_bytevector_n_x | |
509 | { | |
510 | SCM result; | |
511 | char *c_bv; | |
512 | unsigned c_start, c_count, c_len; | |
513 | size_t c_read; | |
514 | ||
515 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
516 | SCM_VALIDATE_BYTEVECTOR (2, bv); | |
517 | c_start = scm_to_uint (start); | |
518 | c_count = scm_to_uint (count); | |
519 | ||
520 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
521 | c_len = SCM_BYTEVECTOR_LENGTH (bv); | |
522 | ||
523 | if (SCM_UNLIKELY (c_start + c_count > c_len)) | |
524 | scm_out_of_range (FUNC_NAME, count); | |
525 | ||
526 | if (SCM_LIKELY (c_count > 0)) | |
be632904 | 527 | c_read = scm_c_read_unlocked (port, c_bv + c_start, c_count); |
1ee2c72e LC |
528 | else |
529 | /* Don't invoke `scm_c_read ()' since it may block. */ | |
530 | c_read = 0; | |
531 | ||
47f2bce5 MW |
532 | if (c_read == 0 && c_count > 0) |
533 | result = SCM_EOF_VAL; | |
1ee2c72e LC |
534 | else |
535 | result = scm_from_size_t (c_read); | |
536 | ||
537 | return result; | |
538 | } | |
539 | #undef FUNC_NAME | |
540 | ||
541 | ||
542 | SCM_DEFINE (scm_get_bytevector_some, "get-bytevector-some", 1, 0, 0, | |
543 | (SCM port), | |
21bbe22a MW |
544 | "Read from @var{port}, blocking as necessary, until bytes " |
545 | "are available or an end-of-file is reached. Return either " | |
546 | "the end-of-file object or a new bytevector containing some " | |
547 | "of the available bytes (at least one), and update the port " | |
548 | "position to point just past these bytes.") | |
1ee2c72e LC |
549 | #define FUNC_NAME s_scm_get_bytevector_some |
550 | { | |
21bbe22a MW |
551 | scm_t_port *pt; |
552 | size_t size; | |
553 | SCM bv; | |
1ee2c72e LC |
554 | |
555 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
21bbe22a | 556 | pt = SCM_PTAB_ENTRY (port); |
1ee2c72e | 557 | |
21bbe22a | 558 | if (pt->rw_active == SCM_PORT_WRITE) |
f6f4feb0 | 559 | scm_flush_unlocked (port); |
1ee2c72e | 560 | |
21bbe22a MW |
561 | if (pt->rw_random) |
562 | pt->rw_active = SCM_PORT_READ; | |
1ee2c72e | 563 | |
21bbe22a | 564 | if (pt->read_pos >= pt->read_end) |
1ee2c72e | 565 | { |
f6f4feb0 | 566 | if (scm_fill_input_unlocked (port) == EOF) |
21bbe22a | 567 | return SCM_EOF_VAL; |
1ee2c72e | 568 | } |
1ee2c72e | 569 | |
21bbe22a MW |
570 | size = pt->read_end - pt->read_pos; |
571 | if (pt->read_buf == pt->putback_buf) | |
572 | size += pt->saved_read_end - pt->saved_read_pos; | |
1ee2c72e | 573 | |
21bbe22a MW |
574 | bv = scm_c_make_bytevector (size); |
575 | scm_take_from_input_buffers | |
576 | (port, (char *) SCM_BYTEVECTOR_CONTENTS (bv), size); | |
577 | ||
578 | return bv; | |
1ee2c72e LC |
579 | } |
580 | #undef FUNC_NAME | |
581 | ||
582 | SCM_DEFINE (scm_get_bytevector_all, "get-bytevector-all", 1, 0, 0, | |
583 | (SCM port), | |
584 | "Read from @var{port}, blocking as necessary, until " | |
585 | "the end-of-file is reached. Return either " | |
586 | "a new bytevector containing the data read or the " | |
587 | "end-of-file object (if no data were available).") | |
588 | #define FUNC_NAME s_scm_get_bytevector_all | |
589 | { | |
590 | SCM result; | |
591 | char *c_bv; | |
592 | unsigned c_len, c_count; | |
593 | size_t c_read, c_total; | |
594 | ||
595 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
596 | ||
597 | c_len = c_count = 4096; | |
05762e72 | 598 | c_bv = (char *) scm_gc_malloc_pointerless (c_len, SCM_GC_BYTEVECTOR); |
1ee2c72e LC |
599 | c_total = c_read = 0; |
600 | ||
601 | do | |
602 | { | |
603 | if (c_total + c_read > c_len) | |
604 | { | |
605 | /* Grow the bytevector. */ | |
606 | c_bv = (char *) scm_gc_realloc (c_bv, c_len, c_len * 2, | |
607 | SCM_GC_BYTEVECTOR); | |
608 | c_count = c_len; | |
609 | c_len *= 2; | |
610 | } | |
611 | ||
612 | /* `scm_c_read ()' blocks until C_COUNT bytes are available or EOF is | |
613 | reached. */ | |
be632904 | 614 | c_read = scm_c_read_unlocked (port, c_bv + c_total, c_count); |
1ee2c72e LC |
615 | c_total += c_read, c_count -= c_read; |
616 | } | |
47f2bce5 | 617 | while (c_count == 0); |
1ee2c72e LC |
618 | |
619 | if (c_total == 0) | |
620 | { | |
621 | result = SCM_EOF_VAL; | |
622 | scm_gc_free (c_bv, c_len, SCM_GC_BYTEVECTOR); | |
623 | } | |
624 | else | |
625 | { | |
626 | if (c_len > c_total) | |
627 | { | |
628 | /* Shrink the bytevector. */ | |
629 | c_bv = (char *) scm_gc_realloc (c_bv, c_len, c_total, | |
630 | SCM_GC_BYTEVECTOR); | |
631 | c_len = (unsigned) c_total; | |
632 | } | |
633 | ||
8b66aa8f AW |
634 | result = scm_c_take_gc_bytevector ((signed char *) c_bv, c_len, |
635 | SCM_BOOL_F); | |
1ee2c72e LC |
636 | } |
637 | ||
638 | return result; | |
639 | } | |
640 | #undef FUNC_NAME | |
641 | ||
642 | ||
643 | \f | |
644 | /* Binary output. */ | |
645 | ||
646 | /* We currently don't support specific binary input ports. */ | |
647 | #define SCM_VALIDATE_BINARY_OUTPUT_PORT SCM_VALIDATE_OPOUTPORT | |
648 | ||
649 | ||
650 | SCM_DEFINE (scm_put_u8, "put-u8", 2, 0, 0, | |
651 | (SCM port, SCM octet), | |
652 | "Write @var{octet} to binary port @var{port}.") | |
653 | #define FUNC_NAME s_scm_put_u8 | |
654 | { | |
655 | scm_t_uint8 c_octet; | |
656 | ||
657 | SCM_VALIDATE_BINARY_OUTPUT_PORT (1, port); | |
658 | c_octet = scm_to_uint8 (octet); | |
659 | ||
0607ebbf | 660 | scm_putc_unlocked ((char) c_octet, port); |
1ee2c72e LC |
661 | |
662 | return SCM_UNSPECIFIED; | |
663 | } | |
664 | #undef FUNC_NAME | |
665 | ||
666 | SCM_DEFINE (scm_put_bytevector, "put-bytevector", 2, 2, 0, | |
667 | (SCM port, SCM bv, SCM start, SCM count), | |
668 | "Write the contents of @var{bv} to @var{port}, optionally " | |
669 | "starting at index @var{start} and limiting to @var{count} " | |
670 | "octets.") | |
671 | #define FUNC_NAME s_scm_put_bytevector | |
672 | { | |
673 | char *c_bv; | |
674 | unsigned c_start, c_count, c_len; | |
675 | ||
676 | SCM_VALIDATE_BINARY_OUTPUT_PORT (1, port); | |
677 | SCM_VALIDATE_BYTEVECTOR (2, bv); | |
678 | ||
679 | c_len = SCM_BYTEVECTOR_LENGTH (bv); | |
680 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
681 | ||
d223c3fc | 682 | if (!scm_is_eq (start, SCM_UNDEFINED)) |
1ee2c72e LC |
683 | { |
684 | c_start = scm_to_uint (start); | |
685 | ||
d223c3fc | 686 | if (!scm_is_eq (count, SCM_UNDEFINED)) |
1ee2c72e LC |
687 | { |
688 | c_count = scm_to_uint (count); | |
689 | if (SCM_UNLIKELY (c_start + c_count > c_len)) | |
690 | scm_out_of_range (FUNC_NAME, count); | |
691 | } | |
692 | else | |
693 | { | |
694 | if (SCM_UNLIKELY (c_start >= c_len)) | |
695 | scm_out_of_range (FUNC_NAME, start); | |
696 | else | |
697 | c_count = c_len - c_start; | |
698 | } | |
699 | } | |
700 | else | |
701 | c_start = 0, c_count = c_len; | |
702 | ||
f209aeee | 703 | scm_c_write_unlocked (port, c_bv + c_start, c_count); |
1ee2c72e LC |
704 | |
705 | return SCM_UNSPECIFIED; | |
706 | } | |
707 | #undef FUNC_NAME | |
708 | ||
7f6c3f8f MW |
709 | SCM_DEFINE (scm_unget_bytevector, "unget-bytevector", 2, 2, 0, |
710 | (SCM port, SCM bv, SCM start, SCM count), | |
711 | "Unget the contents of @var{bv} to @var{port}, optionally " | |
712 | "starting at index @var{start} and limiting to @var{count} " | |
713 | "octets.") | |
714 | #define FUNC_NAME s_scm_unget_bytevector | |
715 | { | |
716 | unsigned char *c_bv; | |
717 | size_t c_start, c_count, c_len; | |
718 | ||
719 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); | |
720 | SCM_VALIDATE_BYTEVECTOR (2, bv); | |
721 | ||
722 | c_len = SCM_BYTEVECTOR_LENGTH (bv); | |
723 | c_bv = (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv); | |
724 | ||
725 | if (!scm_is_eq (start, SCM_UNDEFINED)) | |
726 | { | |
727 | c_start = scm_to_size_t (start); | |
728 | ||
729 | if (!scm_is_eq (count, SCM_UNDEFINED)) | |
730 | { | |
731 | c_count = scm_to_size_t (count); | |
732 | if (SCM_UNLIKELY (c_start + c_count > c_len)) | |
733 | scm_out_of_range (FUNC_NAME, count); | |
734 | } | |
735 | else | |
736 | { | |
737 | if (SCM_UNLIKELY (c_start >= c_len)) | |
738 | scm_out_of_range (FUNC_NAME, start); | |
739 | else | |
740 | c_count = c_len - c_start; | |
741 | } | |
742 | } | |
743 | else | |
744 | c_start = 0, c_count = c_len; | |
745 | ||
746 | scm_unget_bytes (c_bv + c_start, c_count, port); | |
747 | ||
748 | return SCM_UNSPECIFIED; | |
749 | } | |
750 | #undef FUNC_NAME | |
751 | ||
1ee2c72e LC |
752 | |
753 | \f | |
754 | /* Bytevector output port ("bop" for short). */ | |
755 | ||
756 | /* Implementation of "bops". | |
757 | ||
758 | Each bop has an internal buffer, of type `scm_t_bop_buffer', attached to | |
759 | it. The procedure returned along with the output port is actually an | |
760 | applicable SMOB. The SMOB holds a reference to the port. When applied, | |
761 | the SMOB swallows the port's internal buffer, turning it into a | |
762 | bytevector, and resets it. | |
763 | ||
764 | XXX: Access to a bop's internal buffer is not thread-safe. */ | |
765 | ||
766 | static scm_t_bits bytevector_output_port_type = 0; | |
767 | ||
768 | SCM_SMOB (bytevector_output_port_procedure, | |
769 | "r6rs-bytevector-output-port-procedure", | |
770 | 0); | |
771 | ||
772 | #define SCM_GC_BOP "r6rs-bytevector-output-port" | |
773 | #define SCM_BOP_BUFFER_INITIAL_SIZE 4096 | |
774 | ||
775 | /* Representation of a bop's internal buffer. */ | |
776 | typedef struct | |
777 | { | |
778 | size_t total_len; | |
779 | size_t len; | |
780 | size_t pos; | |
781 | char *buffer; | |
782 | } scm_t_bop_buffer; | |
783 | ||
784 | ||
785 | /* Accessing a bop's buffer. */ | |
786 | #define SCM_BOP_BUFFER(_port) \ | |
787 | ((scm_t_bop_buffer *) SCM_STREAM (_port)) | |
788 | #define SCM_SET_BOP_BUFFER(_port, _buf) \ | |
789 | (SCM_SETSTREAM ((_port), (scm_t_bits) (_buf))) | |
790 | ||
791 | ||
792 | static inline void | |
793 | bop_buffer_init (scm_t_bop_buffer *buf) | |
794 | { | |
795 | buf->total_len = buf->len = buf->pos = 0; | |
796 | buf->buffer = NULL; | |
797 | } | |
798 | ||
799 | static inline void | |
800 | bop_buffer_grow (scm_t_bop_buffer *buf, size_t min_size) | |
801 | { | |
802 | char *new_buf; | |
803 | size_t new_size; | |
804 | ||
805 | for (new_size = buf->total_len | |
806 | ? buf->total_len : SCM_BOP_BUFFER_INITIAL_SIZE; | |
807 | new_size < min_size; | |
808 | new_size *= 2); | |
809 | ||
810 | if (buf->buffer) | |
811 | new_buf = scm_gc_realloc ((void *) buf->buffer, buf->total_len, | |
812 | new_size, SCM_GC_BOP); | |
813 | else | |
05762e72 | 814 | new_buf = scm_gc_malloc_pointerless (new_size, SCM_GC_BOP); |
1ee2c72e LC |
815 | |
816 | buf->buffer = new_buf; | |
817 | buf->total_len = new_size; | |
818 | } | |
819 | ||
820 | static inline SCM | |
821 | make_bop (void) | |
822 | { | |
823 | SCM port, bop_proc; | |
824 | scm_t_port *c_port; | |
825 | scm_t_bop_buffer *buf; | |
826 | const unsigned long mode_bits = SCM_OPN | SCM_WRTNG; | |
827 | ||
1ee2c72e LC |
828 | buf = (scm_t_bop_buffer *) scm_gc_malloc (sizeof (* buf), SCM_GC_BOP); |
829 | bop_buffer_init (buf); | |
830 | ||
2721f918 AW |
831 | port = scm_c_make_port_with_encoding (bytevector_output_port_type, |
832 | mode_bits, | |
833 | NULL, /* encoding */ | |
834 | SCM_FAILED_CONVERSION_ERROR, | |
835 | (scm_t_bits)buf); | |
1ee2c72e | 836 | |
2721f918 | 837 | c_port = SCM_PTAB_ENTRY (port); |
1ee2c72e | 838 | |
2721f918 AW |
839 | c_port->write_buf = c_port->write_pos = c_port->write_end = NULL; |
840 | c_port->write_buf_size = 0; | |
a653d32a | 841 | |
1ee2c72e | 842 | /* Make the bop procedure. */ |
a653d32a | 843 | SCM_NEWSMOB (bop_proc, bytevector_output_port_procedure, buf); |
1ee2c72e LC |
844 | |
845 | return (scm_values (scm_list_2 (port, bop_proc))); | |
846 | } | |
847 | ||
1ee2c72e LC |
848 | /* Write SIZE octets from DATA to PORT. */ |
849 | static void | |
850 | bop_write (SCM port, const void *data, size_t size) | |
851 | { | |
852 | scm_t_bop_buffer *buf; | |
853 | ||
854 | buf = SCM_BOP_BUFFER (port); | |
855 | ||
856 | if (buf->pos + size > buf->total_len) | |
857 | bop_buffer_grow (buf, buf->pos + size); | |
858 | ||
859 | memcpy (buf->buffer + buf->pos, data, size); | |
860 | buf->pos += size; | |
861 | buf->len = (buf->len > buf->pos) ? buf->len : buf->pos; | |
862 | } | |
863 | ||
f1ce9199 LC |
864 | static scm_t_off |
865 | bop_seek (SCM port, scm_t_off offset, int whence) | |
1ee2c72e LC |
866 | #define FUNC_NAME "bop_seek" |
867 | { | |
868 | scm_t_bop_buffer *buf; | |
869 | ||
870 | buf = SCM_BOP_BUFFER (port); | |
871 | switch (whence) | |
872 | { | |
873 | case SEEK_CUR: | |
f1ce9199 | 874 | offset += (scm_t_off) buf->pos; |
1ee2c72e LC |
875 | /* Fall through. */ |
876 | ||
877 | case SEEK_SET: | |
878 | if (offset < 0 || (unsigned) offset > buf->len) | |
879 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); | |
880 | else | |
881 | buf->pos = offset; | |
882 | break; | |
883 | ||
884 | case SEEK_END: | |
885 | if (offset < 0 || (unsigned) offset >= buf->len) | |
886 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); | |
887 | else | |
888 | buf->pos = buf->len - (offset + 1); | |
889 | break; | |
890 | ||
891 | default: | |
892 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, | |
893 | "invalid `seek' parameter"); | |
894 | } | |
895 | ||
896 | return buf->pos; | |
897 | } | |
898 | #undef FUNC_NAME | |
899 | ||
900 | /* Fetch data from a bop. */ | |
901 | SCM_SMOB_APPLY (bytevector_output_port_procedure, | |
902 | bop_proc_apply, 0, 0, 0, (SCM bop_proc)) | |
903 | { | |
a653d32a | 904 | SCM bv; |
1ee2c72e LC |
905 | scm_t_bop_buffer *buf, result_buf; |
906 | ||
a653d32a | 907 | buf = (scm_t_bop_buffer *) SCM_SMOB_DATA (bop_proc); |
1ee2c72e LC |
908 | |
909 | result_buf = *buf; | |
910 | bop_buffer_init (buf); | |
911 | ||
912 | if (result_buf.len == 0) | |
8b66aa8f | 913 | bv = scm_c_take_gc_bytevector (NULL, 0, SCM_BOOL_F); |
1ee2c72e LC |
914 | else |
915 | { | |
916 | if (result_buf.total_len > result_buf.len) | |
917 | /* Shrink the buffer. */ | |
918 | result_buf.buffer = scm_gc_realloc ((void *) result_buf.buffer, | |
919 | result_buf.total_len, | |
920 | result_buf.len, | |
921 | SCM_GC_BOP); | |
922 | ||
fb031aba | 923 | bv = scm_c_take_gc_bytevector ((signed char *) result_buf.buffer, |
8b66aa8f | 924 | result_buf.len, SCM_BOOL_F); |
1ee2c72e LC |
925 | } |
926 | ||
927 | return bv; | |
928 | } | |
929 | ||
1ee2c72e LC |
930 | SCM_DEFINE (scm_open_bytevector_output_port, |
931 | "open-bytevector-output-port", 0, 1, 0, | |
932 | (SCM transcoder), | |
933 | "Return two values: an output port and a procedure. The latter " | |
934 | "should be called with zero arguments to obtain a bytevector " | |
935 | "containing the data accumulated by the port.") | |
936 | #define FUNC_NAME s_scm_open_bytevector_output_port | |
937 | { | |
938 | if (!SCM_UNBNDP (transcoder) && !scm_is_false (transcoder)) | |
939 | transcoders_not_implemented (); | |
940 | ||
941 | return (make_bop ()); | |
942 | } | |
943 | #undef FUNC_NAME | |
944 | ||
945 | static inline void | |
946 | initialize_bytevector_output_ports (void) | |
947 | { | |
948 | bytevector_output_port_type = | |
949 | scm_make_port_type ("r6rs-bytevector-output-port", | |
950 | NULL, bop_write); | |
951 | ||
952 | scm_set_port_seek (bytevector_output_port_type, bop_seek); | |
1ee2c72e LC |
953 | } |
954 | ||
955 | \f | |
956 | /* Custom binary output port ("cbop" for short). */ | |
957 | ||
958 | static scm_t_bits custom_binary_output_port_type; | |
959 | ||
960 | /* Return the various procedures of PORT. */ | |
961 | #define SCM_CBOP_WRITE_PROC(_port) \ | |
962 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 0) | |
963 | ||
964 | ||
965 | static inline SCM | |
966 | make_cbop (SCM write_proc, SCM get_position_proc, | |
967 | SCM set_position_proc, SCM close_proc) | |
968 | { | |
969 | SCM port, method_vector; | |
970 | scm_t_port *c_port; | |
971 | const unsigned long mode_bits = SCM_OPN | SCM_WRTNG; | |
972 | ||
973 | /* Store the various methods and bytevector in a vector. */ | |
974 | method_vector = scm_c_make_vector (4, SCM_BOOL_F); | |
975 | SCM_SIMPLE_VECTOR_SET (method_vector, 0, write_proc); | |
976 | SCM_SIMPLE_VECTOR_SET (method_vector, 1, get_position_proc); | |
977 | SCM_SIMPLE_VECTOR_SET (method_vector, 2, set_position_proc); | |
978 | SCM_SIMPLE_VECTOR_SET (method_vector, 3, close_proc); | |
979 | ||
2721f918 AW |
980 | port = scm_c_make_port_with_encoding (custom_binary_output_port_type, |
981 | mode_bits, | |
982 | NULL, /* encoding */ | |
983 | SCM_FAILED_CONVERSION_ERROR, | |
984 | SCM_UNPACK (method_vector)); | |
a653d32a | 985 | |
96128014 LC |
986 | c_port = SCM_PTAB_ENTRY (port); |
987 | ||
1ee2c72e | 988 | /* Have the port directly access the buffer (bytevector). */ |
1ee2c72e LC |
989 | c_port->write_buf = c_port->write_pos = c_port->write_end = NULL; |
990 | c_port->write_buf_size = c_port->read_buf_size = 0; | |
991 | ||
1ee2c72e LC |
992 | return port; |
993 | } | |
994 | ||
995 | /* Write SIZE octets from DATA to PORT. */ | |
996 | static void | |
997 | cbop_write (SCM port, const void *data, size_t size) | |
998 | #define FUNC_NAME "cbop_write" | |
999 | { | |
1000 | long int c_result; | |
1001 | size_t c_written; | |
1002 | SCM bv, write_proc, result; | |
1003 | ||
1004 | /* XXX: Allocating a new bytevector at each `write' call is inefficient, | |
1005 | but necessary since (1) we don't control the lifetime of the buffer | |
1006 | pointed to by DATA, and (2) the `write!' procedure could capture the | |
1007 | bytevector it is passed. */ | |
1008 | bv = scm_c_make_bytevector (size); | |
1009 | memcpy (SCM_BYTEVECTOR_CONTENTS (bv), data, size); | |
1010 | ||
1011 | write_proc = SCM_CBOP_WRITE_PROC (port); | |
1012 | ||
1013 | /* Since the `write' procedure of Guile's ports has type `void', it must | |
1014 | try hard to write exactly SIZE bytes, regardless of how many bytes the | |
1015 | sink can handle. */ | |
1016 | for (c_written = 0; | |
1017 | c_written < size; | |
1018 | c_written += c_result) | |
1019 | { | |
1020 | result = scm_call_3 (write_proc, bv, | |
1021 | scm_from_size_t (c_written), | |
1022 | scm_from_size_t (size - c_written)); | |
1023 | ||
1024 | c_result = scm_to_long (result); | |
1025 | if (SCM_UNLIKELY (c_result < 0 | |
1026 | || (size_t) c_result > (size - c_written))) | |
1027 | scm_wrong_type_arg_msg (FUNC_NAME, 0, result, | |
1028 | "R6RS custom binary output port `write!' " | |
1029 | "returned a incorrect integer"); | |
1030 | } | |
1031 | } | |
1032 | #undef FUNC_NAME | |
1033 | ||
1034 | ||
1035 | SCM_DEFINE (scm_make_custom_binary_output_port, | |
1036 | "make-custom-binary-output-port", 5, 0, 0, | |
1037 | (SCM id, SCM write_proc, SCM get_position_proc, | |
1038 | SCM set_position_proc, SCM close_proc), | |
1039 | "Return a new custom binary output port whose output is drained " | |
1040 | "by invoking @var{write_proc} and passing it a bytevector, an " | |
1041 | "index where octets should be written, and an octet count.") | |
1042 | #define FUNC_NAME s_scm_make_custom_binary_output_port | |
1043 | { | |
1044 | SCM_VALIDATE_STRING (1, id); | |
1045 | SCM_VALIDATE_PROC (2, write_proc); | |
1046 | ||
1047 | if (!scm_is_false (get_position_proc)) | |
1048 | SCM_VALIDATE_PROC (3, get_position_proc); | |
1049 | ||
1050 | if (!scm_is_false (set_position_proc)) | |
1051 | SCM_VALIDATE_PROC (4, set_position_proc); | |
1052 | ||
1053 | if (!scm_is_false (close_proc)) | |
1054 | SCM_VALIDATE_PROC (5, close_proc); | |
1055 | ||
1056 | return (make_cbop (write_proc, get_position_proc, set_position_proc, | |
1057 | close_proc)); | |
1058 | } | |
1059 | #undef FUNC_NAME | |
1060 | ||
1061 | ||
1062 | /* Instantiate the custom binary output port type. */ | |
1063 | static inline void | |
1064 | initialize_custom_binary_output_ports (void) | |
1065 | { | |
1066 | custom_binary_output_port_type = | |
1067 | scm_make_port_type ("r6rs-custom-binary-output-port", | |
1068 | NULL, cbop_write); | |
1069 | ||
1ee2c72e LC |
1070 | scm_set_port_seek (custom_binary_output_port_type, cbp_seek); |
1071 | scm_set_port_close (custom_binary_output_port_type, cbp_close); | |
1072 | } | |
1073 | ||
1074 | \f | |
1044537d AR |
1075 | /* Transcoded ports ("tp" for short). */ |
1076 | static scm_t_bits transcoded_port_type = 0; | |
1077 | ||
1078 | #define TP_INPUT_BUFFER_SIZE 4096 | |
1079 | ||
1080 | #define SCM_TP_BINARY_PORT(_port) SCM_PACK (SCM_STREAM (_port)) | |
1081 | ||
1082 | static inline SCM | |
1083 | make_tp (SCM binary_port, unsigned long mode) | |
1084 | { | |
1085 | SCM port; | |
1086 | scm_t_port *c_port; | |
1087 | const unsigned long mode_bits = SCM_OPN | mode; | |
1088 | ||
2721f918 AW |
1089 | port = scm_c_make_port (transcoded_port_type, mode_bits, |
1090 | SCM_UNPACK (binary_port)); | |
1044537d AR |
1091 | |
1092 | if (SCM_INPUT_PORT_P (port)) | |
1093 | { | |
1094 | c_port = SCM_PTAB_ENTRY (port); | |
1095 | c_port->read_buf = scm_gc_malloc_pointerless (TP_INPUT_BUFFER_SIZE, | |
1096 | "port buffer"); | |
1097 | c_port->read_pos = c_port->read_end = c_port->read_buf; | |
1098 | c_port->read_buf_size = TP_INPUT_BUFFER_SIZE; | |
1099 | ||
1100 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0); | |
1101 | } | |
1102 | ||
1044537d AR |
1103 | return port; |
1104 | } | |
1105 | ||
1106 | static void | |
1107 | tp_write (SCM port, const void *data, size_t size) | |
1108 | { | |
f209aeee | 1109 | scm_c_write_unlocked (SCM_TP_BINARY_PORT (port), data, size); |
1044537d AR |
1110 | } |
1111 | ||
1112 | static int | |
1113 | tp_fill_input (SCM port) | |
1114 | { | |
1115 | size_t count; | |
1116 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); | |
1117 | SCM bport = SCM_TP_BINARY_PORT (port); | |
1118 | scm_t_port *c_bport = SCM_PTAB_ENTRY (bport); | |
1119 | ||
1120 | /* We can't use `scm_c_read' here, since it blocks until the whole | |
1121 | block has been read or EOF. */ | |
1122 | ||
1123 | if (c_bport->rw_active == SCM_PORT_WRITE) | |
1124 | scm_force_output (bport); | |
1125 | ||
1126 | if (c_bport->read_pos >= c_bport->read_end) | |
4251ae2e | 1127 | scm_fill_input_unlocked (bport); |
1044537d AR |
1128 | |
1129 | count = c_bport->read_end - c_bport->read_pos; | |
1130 | if (count > c_port->read_buf_size) | |
1131 | count = c_port->read_buf_size; | |
1132 | ||
1133 | memcpy (c_port->read_buf, c_bport->read_pos, count); | |
1134 | c_bport->read_pos += count; | |
1135 | ||
1136 | if (c_bport->rw_random) | |
1137 | c_bport->rw_active = SCM_PORT_READ; | |
1138 | ||
1139 | if (count == 0) | |
1140 | return EOF; | |
1141 | else | |
1142 | { | |
1143 | c_port->read_pos = c_port->read_buf; | |
1144 | c_port->read_end = c_port->read_buf + count; | |
1145 | return *c_port->read_buf; | |
1146 | } | |
1147 | } | |
1148 | ||
1149 | static void | |
1150 | tp_flush (SCM port) | |
1151 | { | |
1152 | SCM binary_port = SCM_TP_BINARY_PORT (port); | |
1153 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); | |
1154 | size_t count = c_port->write_pos - c_port->write_buf; | |
1155 | ||
dfb572a7 AR |
1156 | /* As the runtime will try to flush all ports upon exit, we test for |
1157 | the underlying port still being open here. Otherwise, when you | |
1158 | would explicitly close the underlying port and the transcoded port | |
1159 | still had data outstanding, you'd get an exception on Guile exit. | |
1160 | ||
1161 | We just throw away the data when the underlying port is closed. */ | |
1162 | ||
1163 | if (SCM_OPOUTPORTP (binary_port)) | |
f209aeee | 1164 | scm_c_write_unlocked (binary_port, c_port->write_buf, count); |
1044537d AR |
1165 | |
1166 | c_port->write_pos = c_port->write_buf; | |
1167 | c_port->rw_active = SCM_PORT_NEITHER; | |
1168 | ||
dfb572a7 AR |
1169 | if (SCM_OPOUTPORTP (binary_port)) |
1170 | scm_force_output (binary_port); | |
1044537d AR |
1171 | } |
1172 | ||
1173 | static int | |
1174 | tp_close (SCM port) | |
1175 | { | |
1176 | if (SCM_OUTPUT_PORT_P (port)) | |
1177 | tp_flush (port); | |
1178 | return scm_is_true (scm_close_port (SCM_TP_BINARY_PORT (port))) ? 0 : -1; | |
1179 | } | |
1180 | ||
1181 | static inline void | |
1182 | initialize_transcoded_ports (void) | |
1183 | { | |
1184 | transcoded_port_type = | |
1185 | scm_make_port_type ("r6rs-transcoded-port", tp_fill_input, tp_write); | |
1186 | ||
1187 | scm_set_port_flush (transcoded_port_type, tp_flush); | |
1188 | scm_set_port_close (transcoded_port_type, tp_close); | |
1189 | } | |
1190 | ||
36cc0b90 AW |
1191 | SCM_INTERNAL SCM scm_i_make_transcoded_port (SCM); |
1192 | ||
1044537d AR |
1193 | SCM_DEFINE (scm_i_make_transcoded_port, |
1194 | "%make-transcoded-port", 1, 0, 0, | |
1195 | (SCM port), | |
1196 | "Return a new port which reads and writes to @var{port}") | |
1197 | #define FUNC_NAME s_scm_i_make_transcoded_port | |
1198 | { | |
1199 | SCM result; | |
1200 | unsigned long mode = 0; | |
1201 | ||
1202 | SCM_VALIDATE_PORT (SCM_ARG1, port); | |
1203 | ||
1204 | if (scm_is_true (scm_output_port_p (port))) | |
1205 | mode |= SCM_WRTNG; | |
1206 | else if (scm_is_true (scm_input_port_p (port))) | |
1207 | mode |= SCM_RDNG; | |
1208 | ||
1209 | result = make_tp (port, mode); | |
1210 | ||
1211 | /* FIXME: We should actually close `port' "in a special way" here, | |
1212 | according to R6RS. As there is no way to do that in Guile without | |
1213 | rendering the underlying port unusable for our purposes as well, we | |
1214 | just leave it open. */ | |
1215 | ||
1216 | return result; | |
1217 | } | |
1218 | #undef FUNC_NAME | |
1219 | ||
1220 | \f | |
a6c377f7 AR |
1221 | /* Textual I/O */ |
1222 | ||
1223 | SCM_DEFINE (scm_get_string_n_x, | |
1224 | "get-string-n!", 4, 0, 0, | |
1225 | (SCM port, SCM str, SCM start, SCM count), | |
1226 | "Read up to @var{count} characters from @var{port} into " | |
1227 | "@var{str}, starting at @var{start}. If no characters " | |
1228 | "can be read before the end of file is encountered, the end " | |
1229 | "of file object is returned. Otherwise, the number of " | |
1230 | "characters read is returned.") | |
1231 | #define FUNC_NAME s_scm_get_string_n_x | |
1232 | { | |
1233 | size_t c_start, c_count, c_len, c_end, j; | |
1234 | scm_t_wchar c; | |
1235 | ||
1236 | SCM_VALIDATE_OPINPORT (1, port); | |
1237 | SCM_VALIDATE_STRING (2, str); | |
1238 | c_len = scm_c_string_length (str); | |
1239 | c_start = scm_to_size_t (start); | |
1240 | c_count = scm_to_size_t (count); | |
1241 | c_end = c_start + c_count; | |
1242 | ||
1243 | if (SCM_UNLIKELY (c_end > c_len)) | |
1244 | scm_out_of_range (FUNC_NAME, count); | |
1245 | ||
1246 | for (j = c_start; j < c_end; j++) | |
1247 | { | |
be632904 | 1248 | c = scm_getc_unlocked (port); |
a6c377f7 AR |
1249 | if (c == EOF) |
1250 | { | |
1251 | size_t chars_read = j - c_start; | |
1252 | return chars_read == 0 ? SCM_EOF_VAL : scm_from_size_t (chars_read); | |
1253 | } | |
1254 | scm_c_string_set_x (str, j, SCM_MAKE_CHAR (c)); | |
1255 | } | |
1256 | return count; | |
1257 | } | |
1258 | #undef FUNC_NAME | |
1259 | ||
1260 | \f | |
1ee2c72e LC |
1261 | /* Initialization. */ |
1262 | ||
c0062328 LC |
1263 | void |
1264 | scm_register_r6rs_ports (void) | |
1265 | { | |
1266 | scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION, | |
1267 | "scm_init_r6rs_ports", | |
1268 | (scm_t_extension_init_func) scm_init_r6rs_ports, | |
1269 | NULL); | |
1270 | } | |
1271 | ||
1ee2c72e LC |
1272 | void |
1273 | scm_init_r6rs_ports (void) | |
1274 | { | |
62e9a9b7 | 1275 | #include "libguile/r6rs-ports.x" |
1ee2c72e LC |
1276 | |
1277 | initialize_bytevector_input_ports (); | |
1278 | initialize_custom_binary_input_ports (); | |
1279 | initialize_bytevector_output_ports (); | |
1280 | initialize_custom_binary_output_ports (); | |
1044537d | 1281 | initialize_transcoded_ports (); |
1ee2c72e | 1282 | } |