| 1 | /* Copyright (C) 2009, 2010, 2011, 2013 Free Software Foundation, Inc. |
| 2 | * |
| 3 | * This library is free software; you can redistribute it and/or |
| 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. |
| 7 | * |
| 8 | * This library is distributed in the hope that it will be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 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 |
| 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 16 | * 02110-1301 USA |
| 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 | |
| 87 | scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex); |
| 88 | |
| 89 | port = scm_new_port_table_entry (bytevector_input_port_type); |
| 90 | c_port = SCM_PTAB_ENTRY (port); |
| 91 | |
| 92 | /* Match the expectation of `binary-port?'. */ |
| 93 | c_port->encoding = NULL; |
| 94 | |
| 95 | /* Prevent BV from being GC'd. */ |
| 96 | SCM_SETSTREAM (port, SCM_UNPACK (bv)); |
| 97 | |
| 98 | /* Have the port directly access the bytevector. */ |
| 99 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); |
| 100 | c_len = SCM_BYTEVECTOR_LENGTH (bv); |
| 101 | |
| 102 | c_port->read_pos = c_port->read_buf = (unsigned char *) c_bv; |
| 103 | c_port->read_end = (unsigned char *) c_bv + c_len; |
| 104 | c_port->read_buf_size = c_len; |
| 105 | |
| 106 | /* Mark PORT as open, readable and unbuffered (hmm, how elegant...). */ |
| 107 | SCM_SET_CELL_TYPE (port, bytevector_input_port_type | mode_bits); |
| 108 | |
| 109 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
| 110 | |
| 111 | return port; |
| 112 | } |
| 113 | |
| 114 | static int |
| 115 | bip_fill_input (SCM port) |
| 116 | { |
| 117 | int result; |
| 118 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); |
| 119 | |
| 120 | if (c_port->read_pos >= c_port->read_end) |
| 121 | result = EOF; |
| 122 | else |
| 123 | result = (int) *c_port->read_pos; |
| 124 | |
| 125 | return result; |
| 126 | } |
| 127 | |
| 128 | static scm_t_off |
| 129 | bip_seek (SCM port, scm_t_off offset, int whence) |
| 130 | #define FUNC_NAME "bip_seek" |
| 131 | { |
| 132 | scm_t_off c_result = 0; |
| 133 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); |
| 134 | |
| 135 | switch (whence) |
| 136 | { |
| 137 | case SEEK_CUR: |
| 138 | offset += c_port->read_pos - c_port->read_buf; |
| 139 | /* Fall through. */ |
| 140 | |
| 141 | case SEEK_SET: |
| 142 | if (c_port->read_buf + offset <= c_port->read_end) |
| 143 | { |
| 144 | c_port->read_pos = c_port->read_buf + offset; |
| 145 | c_result = offset; |
| 146 | } |
| 147 | else |
| 148 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); |
| 149 | break; |
| 150 | |
| 151 | case SEEK_END: |
| 152 | if (c_port->read_end - offset >= c_port->read_buf) |
| 153 | { |
| 154 | c_port->read_pos = c_port->read_end - offset; |
| 155 | c_result = c_port->read_pos - c_port->read_buf; |
| 156 | } |
| 157 | else |
| 158 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); |
| 159 | break; |
| 160 | |
| 161 | default: |
| 162 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, |
| 163 | "invalid `seek' parameter"); |
| 164 | } |
| 165 | |
| 166 | return c_result; |
| 167 | } |
| 168 | #undef FUNC_NAME |
| 169 | |
| 170 | |
| 171 | /* Instantiate the bytevector input port type. */ |
| 172 | static inline void |
| 173 | initialize_bytevector_input_ports (void) |
| 174 | { |
| 175 | bytevector_input_port_type = |
| 176 | scm_make_port_type ("r6rs-bytevector-input-port", bip_fill_input, |
| 177 | NULL); |
| 178 | |
| 179 | scm_set_port_seek (bytevector_input_port_type, bip_seek); |
| 180 | } |
| 181 | |
| 182 | |
| 183 | SCM_DEFINE (scm_open_bytevector_input_port, |
| 184 | "open-bytevector-input-port", 1, 1, 0, |
| 185 | (SCM bv, SCM transcoder), |
| 186 | "Return an input port whose contents are drawn from " |
| 187 | "bytevector @var{bv}.") |
| 188 | #define FUNC_NAME s_scm_open_bytevector_input_port |
| 189 | { |
| 190 | SCM_VALIDATE_BYTEVECTOR (1, bv); |
| 191 | if (!SCM_UNBNDP (transcoder) && !scm_is_false (transcoder)) |
| 192 | transcoders_not_implemented (); |
| 193 | |
| 194 | return (make_bip (bv)); |
| 195 | } |
| 196 | #undef FUNC_NAME |
| 197 | |
| 198 | \f |
| 199 | /* Custom binary ports. The following routines are shared by input and |
| 200 | output custom binary ports. */ |
| 201 | |
| 202 | #define SCM_CBP_GET_POSITION_PROC(_port) \ |
| 203 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 1) |
| 204 | #define SCM_CBP_SET_POSITION_PROC(_port) \ |
| 205 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 2) |
| 206 | #define SCM_CBP_CLOSE_PROC(_port) \ |
| 207 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 3) |
| 208 | |
| 209 | static scm_t_off |
| 210 | cbp_seek (SCM port, scm_t_off offset, int whence) |
| 211 | #define FUNC_NAME "cbp_seek" |
| 212 | { |
| 213 | SCM result; |
| 214 | scm_t_off c_result = 0; |
| 215 | |
| 216 | switch (whence) |
| 217 | { |
| 218 | case SEEK_CUR: |
| 219 | { |
| 220 | SCM get_position_proc; |
| 221 | |
| 222 | get_position_proc = SCM_CBP_GET_POSITION_PROC (port); |
| 223 | if (SCM_LIKELY (scm_is_true (get_position_proc))) |
| 224 | result = scm_call_0 (get_position_proc); |
| 225 | else |
| 226 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, |
| 227 | "R6RS custom binary port does not " |
| 228 | "support `port-position'"); |
| 229 | |
| 230 | offset += scm_to_int (result); |
| 231 | /* Fall through. */ |
| 232 | } |
| 233 | |
| 234 | case SEEK_SET: |
| 235 | { |
| 236 | SCM set_position_proc; |
| 237 | |
| 238 | set_position_proc = SCM_CBP_SET_POSITION_PROC (port); |
| 239 | if (SCM_LIKELY (scm_is_true (set_position_proc))) |
| 240 | result = scm_call_1 (set_position_proc, scm_from_int (offset)); |
| 241 | else |
| 242 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, |
| 243 | "R6RS custom binary port does not " |
| 244 | "support `set-port-position!'"); |
| 245 | |
| 246 | /* Assuming setting the position succeeded. */ |
| 247 | c_result = offset; |
| 248 | break; |
| 249 | } |
| 250 | |
| 251 | default: |
| 252 | /* `SEEK_END' cannot be supported. */ |
| 253 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, |
| 254 | "R6RS custom binary ports do not " |
| 255 | "support `SEEK_END'"); |
| 256 | } |
| 257 | |
| 258 | return c_result; |
| 259 | } |
| 260 | #undef FUNC_NAME |
| 261 | |
| 262 | static int |
| 263 | cbp_close (SCM port) |
| 264 | { |
| 265 | SCM close_proc; |
| 266 | |
| 267 | close_proc = SCM_CBP_CLOSE_PROC (port); |
| 268 | if (scm_is_true (close_proc)) |
| 269 | /* Invoke the `close' thunk. */ |
| 270 | scm_call_0 (close_proc); |
| 271 | |
| 272 | return 1; |
| 273 | } |
| 274 | |
| 275 | \f |
| 276 | /* Custom binary input port ("cbip" for short). */ |
| 277 | |
| 278 | static scm_t_bits custom_binary_input_port_type = 0; |
| 279 | |
| 280 | /* Size of the buffer embedded in custom binary input ports. */ |
| 281 | #define CBIP_BUFFER_SIZE 4096 |
| 282 | |
| 283 | /* Return the bytevector associated with PORT. */ |
| 284 | #define SCM_CBIP_BYTEVECTOR(_port) \ |
| 285 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 4) |
| 286 | |
| 287 | /* Return the various procedures of PORT. */ |
| 288 | #define SCM_CBIP_READ_PROC(_port) \ |
| 289 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 0) |
| 290 | |
| 291 | |
| 292 | static inline SCM |
| 293 | make_cbip (SCM read_proc, SCM get_position_proc, |
| 294 | SCM set_position_proc, SCM close_proc) |
| 295 | { |
| 296 | SCM port, bv, method_vector; |
| 297 | char *c_bv; |
| 298 | unsigned c_len; |
| 299 | scm_t_port *c_port; |
| 300 | const unsigned long mode_bits = SCM_OPN | SCM_RDNG; |
| 301 | |
| 302 | /* Use a bytevector as the underlying buffer. */ |
| 303 | c_len = CBIP_BUFFER_SIZE; |
| 304 | bv = scm_c_make_bytevector (c_len); |
| 305 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); |
| 306 | |
| 307 | /* Store the various methods and bytevector in a vector. */ |
| 308 | method_vector = scm_c_make_vector (5, SCM_BOOL_F); |
| 309 | SCM_SIMPLE_VECTOR_SET (method_vector, 4, bv); |
| 310 | SCM_SIMPLE_VECTOR_SET (method_vector, 0, read_proc); |
| 311 | SCM_SIMPLE_VECTOR_SET (method_vector, 1, get_position_proc); |
| 312 | SCM_SIMPLE_VECTOR_SET (method_vector, 2, set_position_proc); |
| 313 | SCM_SIMPLE_VECTOR_SET (method_vector, 3, close_proc); |
| 314 | |
| 315 | scm_i_pthread_mutex_lock (&scm_i_port_table_mutex); |
| 316 | |
| 317 | port = scm_new_port_table_entry (custom_binary_input_port_type); |
| 318 | c_port = SCM_PTAB_ENTRY (port); |
| 319 | |
| 320 | /* Match the expectation of `binary-port?'. */ |
| 321 | c_port->encoding = NULL; |
| 322 | |
| 323 | /* Attach it the method vector. */ |
| 324 | SCM_SETSTREAM (port, SCM_UNPACK (method_vector)); |
| 325 | |
| 326 | /* Have the port directly access the buffer (bytevector). */ |
| 327 | c_port->read_pos = c_port->read_buf = (unsigned char *) c_bv; |
| 328 | c_port->read_end = (unsigned char *) c_bv; |
| 329 | c_port->read_buf_size = c_len; |
| 330 | |
| 331 | /* Mark PORT as open, readable and unbuffered (hmm, how elegant...). */ |
| 332 | SCM_SET_CELL_TYPE (port, custom_binary_input_port_type | mode_bits); |
| 333 | |
| 334 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
| 335 | |
| 336 | return port; |
| 337 | } |
| 338 | |
| 339 | static int |
| 340 | cbip_fill_input (SCM port) |
| 341 | #define FUNC_NAME "cbip_fill_input" |
| 342 | { |
| 343 | int result; |
| 344 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); |
| 345 | |
| 346 | again: |
| 347 | if (c_port->read_pos >= c_port->read_end) |
| 348 | { |
| 349 | /* Invoke the user's `read!' procedure. */ |
| 350 | unsigned c_octets; |
| 351 | SCM bv, read_proc, octets; |
| 352 | |
| 353 | /* Use the bytevector associated with PORT as the buffer passed to the |
| 354 | `read!' procedure, thereby avoiding additional allocations. */ |
| 355 | bv = SCM_CBIP_BYTEVECTOR (port); |
| 356 | read_proc = SCM_CBIP_READ_PROC (port); |
| 357 | |
| 358 | /* The assumption here is that C_PORT's internal buffer wasn't changed |
| 359 | behind our back. */ |
| 360 | assert (c_port->read_buf == |
| 361 | (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv)); |
| 362 | assert ((unsigned) c_port->read_buf_size |
| 363 | == SCM_BYTEVECTOR_LENGTH (bv)); |
| 364 | |
| 365 | octets = scm_call_3 (read_proc, bv, SCM_INUM0, |
| 366 | SCM_I_MAKINUM (CBIP_BUFFER_SIZE)); |
| 367 | c_octets = scm_to_uint (octets); |
| 368 | |
| 369 | c_port->read_pos = (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv); |
| 370 | c_port->read_end = (unsigned char *) c_port->read_pos + c_octets; |
| 371 | |
| 372 | if (c_octets > 0) |
| 373 | goto again; |
| 374 | else |
| 375 | result = EOF; |
| 376 | } |
| 377 | else |
| 378 | result = (int) *c_port->read_pos; |
| 379 | |
| 380 | return result; |
| 381 | } |
| 382 | #undef FUNC_NAME |
| 383 | |
| 384 | |
| 385 | SCM_DEFINE (scm_make_custom_binary_input_port, |
| 386 | "make-custom-binary-input-port", 5, 0, 0, |
| 387 | (SCM id, SCM read_proc, SCM get_position_proc, |
| 388 | SCM set_position_proc, SCM close_proc), |
| 389 | "Return a new custom binary input port whose input is drained " |
| 390 | "by invoking @var{read_proc} and passing it a bytevector, an " |
| 391 | "index where octets should be written, and an octet count.") |
| 392 | #define FUNC_NAME s_scm_make_custom_binary_input_port |
| 393 | { |
| 394 | SCM_VALIDATE_STRING (1, id); |
| 395 | SCM_VALIDATE_PROC (2, read_proc); |
| 396 | |
| 397 | if (!scm_is_false (get_position_proc)) |
| 398 | SCM_VALIDATE_PROC (3, get_position_proc); |
| 399 | |
| 400 | if (!scm_is_false (set_position_proc)) |
| 401 | SCM_VALIDATE_PROC (4, set_position_proc); |
| 402 | |
| 403 | if (!scm_is_false (close_proc)) |
| 404 | SCM_VALIDATE_PROC (5, close_proc); |
| 405 | |
| 406 | return (make_cbip (read_proc, get_position_proc, set_position_proc, |
| 407 | close_proc)); |
| 408 | } |
| 409 | #undef FUNC_NAME |
| 410 | |
| 411 | |
| 412 | /* Instantiate the custom binary input port type. */ |
| 413 | static inline void |
| 414 | initialize_custom_binary_input_ports (void) |
| 415 | { |
| 416 | custom_binary_input_port_type = |
| 417 | scm_make_port_type ("r6rs-custom-binary-input-port", |
| 418 | cbip_fill_input, NULL); |
| 419 | |
| 420 | scm_set_port_seek (custom_binary_input_port_type, cbp_seek); |
| 421 | scm_set_port_close (custom_binary_input_port_type, cbp_close); |
| 422 | } |
| 423 | |
| 424 | |
| 425 | \f |
| 426 | /* Binary input. */ |
| 427 | |
| 428 | /* We currently don't support specific binary input ports. */ |
| 429 | #define SCM_VALIDATE_BINARY_INPUT_PORT SCM_VALIDATE_OPINPORT |
| 430 | |
| 431 | SCM_DEFINE (scm_get_u8, "get-u8", 1, 0, 0, |
| 432 | (SCM port), |
| 433 | "Read an octet from @var{port}, a binary input port, " |
| 434 | "blocking as necessary.") |
| 435 | #define FUNC_NAME s_scm_get_u8 |
| 436 | { |
| 437 | SCM result; |
| 438 | int c_result; |
| 439 | |
| 440 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); |
| 441 | |
| 442 | c_result = scm_get_byte_or_eof (port); |
| 443 | if (c_result == EOF) |
| 444 | result = SCM_EOF_VAL; |
| 445 | else |
| 446 | result = SCM_I_MAKINUM ((unsigned char) c_result); |
| 447 | |
| 448 | return result; |
| 449 | } |
| 450 | #undef FUNC_NAME |
| 451 | |
| 452 | SCM_DEFINE (scm_lookahead_u8, "lookahead-u8", 1, 0, 0, |
| 453 | (SCM port), |
| 454 | "Like @code{get-u8} but does not update @var{port} to " |
| 455 | "point past the octet.") |
| 456 | #define FUNC_NAME s_scm_lookahead_u8 |
| 457 | { |
| 458 | int u8; |
| 459 | SCM result; |
| 460 | |
| 461 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); |
| 462 | |
| 463 | u8 = scm_peek_byte_or_eof (port); |
| 464 | if (u8 == EOF) |
| 465 | result = SCM_EOF_VAL; |
| 466 | else |
| 467 | result = SCM_I_MAKINUM ((scm_t_uint8) u8); |
| 468 | |
| 469 | return result; |
| 470 | } |
| 471 | #undef FUNC_NAME |
| 472 | |
| 473 | SCM_DEFINE (scm_get_bytevector_n, "get-bytevector-n", 2, 0, 0, |
| 474 | (SCM port, SCM count), |
| 475 | "Read @var{count} octets from @var{port}, blocking as " |
| 476 | "necessary and return a bytevector containing the octets " |
| 477 | "read. If fewer bytes are available, a bytevector smaller " |
| 478 | "than @var{count} is returned.") |
| 479 | #define FUNC_NAME s_scm_get_bytevector_n |
| 480 | { |
| 481 | SCM result; |
| 482 | char *c_bv; |
| 483 | unsigned c_count; |
| 484 | size_t c_read; |
| 485 | |
| 486 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); |
| 487 | c_count = scm_to_uint (count); |
| 488 | |
| 489 | result = scm_c_make_bytevector (c_count); |
| 490 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (result); |
| 491 | |
| 492 | if (SCM_LIKELY (c_count > 0)) |
| 493 | /* XXX: `scm_c_read ()' does not update the port position. */ |
| 494 | c_read = scm_c_read (port, c_bv, c_count); |
| 495 | else |
| 496 | /* Don't invoke `scm_c_read ()' since it may block. */ |
| 497 | c_read = 0; |
| 498 | |
| 499 | if ((c_read == 0) && (c_count > 0)) |
| 500 | { |
| 501 | if (scm_peek_byte_or_eof (port) == EOF) |
| 502 | result = SCM_EOF_VAL; |
| 503 | else |
| 504 | result = scm_null_bytevector; |
| 505 | } |
| 506 | else |
| 507 | { |
| 508 | if (c_read < c_count) |
| 509 | result = scm_c_shrink_bytevector (result, c_read); |
| 510 | } |
| 511 | |
| 512 | return result; |
| 513 | } |
| 514 | #undef FUNC_NAME |
| 515 | |
| 516 | SCM_DEFINE (scm_get_bytevector_n_x, "get-bytevector-n!", 4, 0, 0, |
| 517 | (SCM port, SCM bv, SCM start, SCM count), |
| 518 | "Read @var{count} bytes from @var{port} and store them " |
| 519 | "in @var{bv} starting at index @var{start}. Return either " |
| 520 | "the number of bytes actually read or the end-of-file " |
| 521 | "object.") |
| 522 | #define FUNC_NAME s_scm_get_bytevector_n_x |
| 523 | { |
| 524 | SCM result; |
| 525 | char *c_bv; |
| 526 | unsigned c_start, c_count, c_len; |
| 527 | size_t c_read; |
| 528 | |
| 529 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); |
| 530 | SCM_VALIDATE_BYTEVECTOR (2, bv); |
| 531 | c_start = scm_to_uint (start); |
| 532 | c_count = scm_to_uint (count); |
| 533 | |
| 534 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); |
| 535 | c_len = SCM_BYTEVECTOR_LENGTH (bv); |
| 536 | |
| 537 | if (SCM_UNLIKELY (c_start + c_count > c_len)) |
| 538 | scm_out_of_range (FUNC_NAME, count); |
| 539 | |
| 540 | if (SCM_LIKELY (c_count > 0)) |
| 541 | c_read = scm_c_read (port, c_bv + c_start, c_count); |
| 542 | else |
| 543 | /* Don't invoke `scm_c_read ()' since it may block. */ |
| 544 | c_read = 0; |
| 545 | |
| 546 | if ((c_read == 0) && (c_count > 0)) |
| 547 | { |
| 548 | if (scm_peek_byte_or_eof (port) == EOF) |
| 549 | result = SCM_EOF_VAL; |
| 550 | else |
| 551 | result = SCM_I_MAKINUM (0); |
| 552 | } |
| 553 | else |
| 554 | result = scm_from_size_t (c_read); |
| 555 | |
| 556 | return result; |
| 557 | } |
| 558 | #undef FUNC_NAME |
| 559 | |
| 560 | |
| 561 | SCM_DEFINE (scm_get_bytevector_some, "get-bytevector-some", 1, 0, 0, |
| 562 | (SCM port), |
| 563 | "Read from @var{port}, blocking as necessary, until data " |
| 564 | "are available or and end-of-file is reached. Return either " |
| 565 | "a new bytevector containing the data read or the " |
| 566 | "end-of-file object.") |
| 567 | #define FUNC_NAME s_scm_get_bytevector_some |
| 568 | { |
| 569 | /* Read at least one byte, unless the end-of-file is already reached, and |
| 570 | read while characters are available (buffered). */ |
| 571 | |
| 572 | SCM result; |
| 573 | char *c_bv; |
| 574 | unsigned c_len; |
| 575 | size_t c_total; |
| 576 | |
| 577 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); |
| 578 | |
| 579 | c_len = 4096; |
| 580 | c_bv = (char *) scm_gc_malloc_pointerless (c_len, SCM_GC_BYTEVECTOR); |
| 581 | c_total = 0; |
| 582 | |
| 583 | do |
| 584 | { |
| 585 | int c_chr; |
| 586 | |
| 587 | if (c_total + 1 > c_len) |
| 588 | { |
| 589 | /* Grow the bytevector. */ |
| 590 | c_bv = (char *) scm_gc_realloc (c_bv, c_len, c_len * 2, |
| 591 | SCM_GC_BYTEVECTOR); |
| 592 | c_len *= 2; |
| 593 | } |
| 594 | |
| 595 | /* We can't use `scm_c_read ()' since it blocks. */ |
| 596 | c_chr = scm_get_byte_or_eof (port); |
| 597 | if (c_chr != EOF) |
| 598 | { |
| 599 | c_bv[c_total] = (char) c_chr; |
| 600 | c_total++; |
| 601 | } |
| 602 | } |
| 603 | /* XXX: We want to check for the availability of a byte, but that's |
| 604 | what `scm_char_ready_p' actually does. */ |
| 605 | while (scm_is_true (scm_char_ready_p (port)) |
| 606 | && (scm_peek_byte_or_eof (port) != EOF)); |
| 607 | |
| 608 | if (c_total == 0) |
| 609 | { |
| 610 | result = SCM_EOF_VAL; |
| 611 | scm_gc_free (c_bv, c_len, SCM_GC_BYTEVECTOR); |
| 612 | } |
| 613 | else |
| 614 | { |
| 615 | if (c_len > c_total) |
| 616 | { |
| 617 | /* Shrink the bytevector. */ |
| 618 | c_bv = (char *) scm_gc_realloc (c_bv, c_len, c_total, |
| 619 | SCM_GC_BYTEVECTOR); |
| 620 | c_len = (unsigned) c_total; |
| 621 | } |
| 622 | |
| 623 | result = scm_c_take_gc_bytevector ((signed char *) c_bv, c_len); |
| 624 | } |
| 625 | |
| 626 | return result; |
| 627 | } |
| 628 | #undef FUNC_NAME |
| 629 | |
| 630 | SCM_DEFINE (scm_get_bytevector_all, "get-bytevector-all", 1, 0, 0, |
| 631 | (SCM port), |
| 632 | "Read from @var{port}, blocking as necessary, until " |
| 633 | "the end-of-file is reached. Return either " |
| 634 | "a new bytevector containing the data read or the " |
| 635 | "end-of-file object (if no data were available).") |
| 636 | #define FUNC_NAME s_scm_get_bytevector_all |
| 637 | { |
| 638 | SCM result; |
| 639 | char *c_bv; |
| 640 | unsigned c_len, c_count; |
| 641 | size_t c_read, c_total; |
| 642 | |
| 643 | SCM_VALIDATE_BINARY_INPUT_PORT (1, port); |
| 644 | |
| 645 | c_len = c_count = 4096; |
| 646 | c_bv = (char *) scm_gc_malloc_pointerless (c_len, SCM_GC_BYTEVECTOR); |
| 647 | c_total = c_read = 0; |
| 648 | |
| 649 | do |
| 650 | { |
| 651 | if (c_total + c_read > c_len) |
| 652 | { |
| 653 | /* Grow the bytevector. */ |
| 654 | c_bv = (char *) scm_gc_realloc (c_bv, c_len, c_len * 2, |
| 655 | SCM_GC_BYTEVECTOR); |
| 656 | c_count = c_len; |
| 657 | c_len *= 2; |
| 658 | } |
| 659 | |
| 660 | /* `scm_c_read ()' blocks until C_COUNT bytes are available or EOF is |
| 661 | reached. */ |
| 662 | c_read = scm_c_read (port, c_bv + c_total, c_count); |
| 663 | c_total += c_read, c_count -= c_read; |
| 664 | } |
| 665 | while (scm_peek_byte_or_eof (port) != EOF); |
| 666 | |
| 667 | if (c_total == 0) |
| 668 | { |
| 669 | result = SCM_EOF_VAL; |
| 670 | scm_gc_free (c_bv, c_len, SCM_GC_BYTEVECTOR); |
| 671 | } |
| 672 | else |
| 673 | { |
| 674 | if (c_len > c_total) |
| 675 | { |
| 676 | /* Shrink the bytevector. */ |
| 677 | c_bv = (char *) scm_gc_realloc (c_bv, c_len, c_total, |
| 678 | SCM_GC_BYTEVECTOR); |
| 679 | c_len = (unsigned) c_total; |
| 680 | } |
| 681 | |
| 682 | result = scm_c_take_gc_bytevector ((signed char *) c_bv, c_len); |
| 683 | } |
| 684 | |
| 685 | return result; |
| 686 | } |
| 687 | #undef FUNC_NAME |
| 688 | |
| 689 | |
| 690 | \f |
| 691 | /* Binary output. */ |
| 692 | |
| 693 | /* We currently don't support specific binary input ports. */ |
| 694 | #define SCM_VALIDATE_BINARY_OUTPUT_PORT SCM_VALIDATE_OPOUTPORT |
| 695 | |
| 696 | |
| 697 | SCM_DEFINE (scm_put_u8, "put-u8", 2, 0, 0, |
| 698 | (SCM port, SCM octet), |
| 699 | "Write @var{octet} to binary port @var{port}.") |
| 700 | #define FUNC_NAME s_scm_put_u8 |
| 701 | { |
| 702 | scm_t_uint8 c_octet; |
| 703 | |
| 704 | SCM_VALIDATE_BINARY_OUTPUT_PORT (1, port); |
| 705 | c_octet = scm_to_uint8 (octet); |
| 706 | |
| 707 | scm_putc ((char) c_octet, port); |
| 708 | |
| 709 | return SCM_UNSPECIFIED; |
| 710 | } |
| 711 | #undef FUNC_NAME |
| 712 | |
| 713 | SCM_DEFINE (scm_put_bytevector, "put-bytevector", 2, 2, 0, |
| 714 | (SCM port, SCM bv, SCM start, SCM count), |
| 715 | "Write the contents of @var{bv} to @var{port}, optionally " |
| 716 | "starting at index @var{start} and limiting to @var{count} " |
| 717 | "octets.") |
| 718 | #define FUNC_NAME s_scm_put_bytevector |
| 719 | { |
| 720 | char *c_bv; |
| 721 | unsigned c_start, c_count, c_len; |
| 722 | |
| 723 | SCM_VALIDATE_BINARY_OUTPUT_PORT (1, port); |
| 724 | SCM_VALIDATE_BYTEVECTOR (2, bv); |
| 725 | |
| 726 | c_len = SCM_BYTEVECTOR_LENGTH (bv); |
| 727 | c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv); |
| 728 | |
| 729 | if (!scm_is_eq (start, SCM_UNDEFINED)) |
| 730 | { |
| 731 | c_start = scm_to_uint (start); |
| 732 | |
| 733 | if (!scm_is_eq (count, SCM_UNDEFINED)) |
| 734 | { |
| 735 | c_count = scm_to_uint (count); |
| 736 | if (SCM_UNLIKELY (c_start + c_count > c_len)) |
| 737 | scm_out_of_range (FUNC_NAME, count); |
| 738 | } |
| 739 | else |
| 740 | { |
| 741 | if (SCM_UNLIKELY (c_start >= c_len)) |
| 742 | scm_out_of_range (FUNC_NAME, start); |
| 743 | else |
| 744 | c_count = c_len - c_start; |
| 745 | } |
| 746 | } |
| 747 | else |
| 748 | c_start = 0, c_count = c_len; |
| 749 | |
| 750 | scm_c_write (port, c_bv + c_start, c_count); |
| 751 | |
| 752 | return SCM_UNSPECIFIED; |
| 753 | } |
| 754 | #undef FUNC_NAME |
| 755 | |
| 756 | |
| 757 | \f |
| 758 | /* Bytevector output port ("bop" for short). */ |
| 759 | |
| 760 | /* Implementation of "bops". |
| 761 | |
| 762 | Each bop has an internal buffer, of type `scm_t_bop_buffer', attached to |
| 763 | it. The procedure returned along with the output port is actually an |
| 764 | applicable SMOB. The SMOB holds a reference to the port. When applied, |
| 765 | the SMOB swallows the port's internal buffer, turning it into a |
| 766 | bytevector, and resets it. |
| 767 | |
| 768 | XXX: Access to a bop's internal buffer is not thread-safe. */ |
| 769 | |
| 770 | static scm_t_bits bytevector_output_port_type = 0; |
| 771 | |
| 772 | SCM_SMOB (bytevector_output_port_procedure, |
| 773 | "r6rs-bytevector-output-port-procedure", |
| 774 | 0); |
| 775 | |
| 776 | #define SCM_GC_BOP "r6rs-bytevector-output-port" |
| 777 | #define SCM_BOP_BUFFER_INITIAL_SIZE 4096 |
| 778 | |
| 779 | /* Representation of a bop's internal buffer. */ |
| 780 | typedef struct |
| 781 | { |
| 782 | size_t total_len; |
| 783 | size_t len; |
| 784 | size_t pos; |
| 785 | char *buffer; |
| 786 | } scm_t_bop_buffer; |
| 787 | |
| 788 | |
| 789 | /* Accessing a bop's buffer. */ |
| 790 | #define SCM_BOP_BUFFER(_port) \ |
| 791 | ((scm_t_bop_buffer *) SCM_STREAM (_port)) |
| 792 | #define SCM_SET_BOP_BUFFER(_port, _buf) \ |
| 793 | (SCM_SETSTREAM ((_port), (scm_t_bits) (_buf))) |
| 794 | |
| 795 | |
| 796 | static inline void |
| 797 | bop_buffer_init (scm_t_bop_buffer *buf) |
| 798 | { |
| 799 | buf->total_len = buf->len = buf->pos = 0; |
| 800 | buf->buffer = NULL; |
| 801 | } |
| 802 | |
| 803 | static inline void |
| 804 | bop_buffer_grow (scm_t_bop_buffer *buf, size_t min_size) |
| 805 | { |
| 806 | char *new_buf; |
| 807 | size_t new_size; |
| 808 | |
| 809 | for (new_size = buf->total_len |
| 810 | ? buf->total_len : SCM_BOP_BUFFER_INITIAL_SIZE; |
| 811 | new_size < min_size; |
| 812 | new_size *= 2); |
| 813 | |
| 814 | if (buf->buffer) |
| 815 | new_buf = scm_gc_realloc ((void *) buf->buffer, buf->total_len, |
| 816 | new_size, SCM_GC_BOP); |
| 817 | else |
| 818 | new_buf = scm_gc_malloc_pointerless (new_size, SCM_GC_BOP); |
| 819 | |
| 820 | buf->buffer = new_buf; |
| 821 | buf->total_len = new_size; |
| 822 | } |
| 823 | |
| 824 | static inline SCM |
| 825 | make_bop (void) |
| 826 | { |
| 827 | SCM port, bop_proc; |
| 828 | scm_t_port *c_port; |
| 829 | scm_t_bop_buffer *buf; |
| 830 | const unsigned long mode_bits = SCM_OPN | SCM_WRTNG; |
| 831 | |
| 832 | scm_i_pthread_mutex_lock (&scm_i_port_table_mutex); |
| 833 | |
| 834 | port = scm_new_port_table_entry (bytevector_output_port_type); |
| 835 | c_port = SCM_PTAB_ENTRY (port); |
| 836 | |
| 837 | /* Match the expectation of `binary-port?'. */ |
| 838 | c_port->encoding = NULL; |
| 839 | |
| 840 | buf = (scm_t_bop_buffer *) scm_gc_malloc (sizeof (* buf), SCM_GC_BOP); |
| 841 | bop_buffer_init (buf); |
| 842 | |
| 843 | c_port->write_buf = c_port->write_pos = c_port->write_end = NULL; |
| 844 | c_port->write_buf_size = 0; |
| 845 | |
| 846 | SCM_SET_BOP_BUFFER (port, buf); |
| 847 | |
| 848 | /* Mark PORT as open and writable. */ |
| 849 | SCM_SET_CELL_TYPE (port, bytevector_output_port_type | mode_bits); |
| 850 | |
| 851 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
| 852 | |
| 853 | /* Make the bop procedure. */ |
| 854 | SCM_NEWSMOB (bop_proc, bytevector_output_port_procedure, buf); |
| 855 | |
| 856 | return (scm_values (scm_list_2 (port, bop_proc))); |
| 857 | } |
| 858 | |
| 859 | /* Write SIZE octets from DATA to PORT. */ |
| 860 | static void |
| 861 | bop_write (SCM port, const void *data, size_t size) |
| 862 | { |
| 863 | scm_t_bop_buffer *buf; |
| 864 | |
| 865 | buf = SCM_BOP_BUFFER (port); |
| 866 | |
| 867 | if (buf->pos + size > buf->total_len) |
| 868 | bop_buffer_grow (buf, buf->pos + size); |
| 869 | |
| 870 | memcpy (buf->buffer + buf->pos, data, size); |
| 871 | buf->pos += size; |
| 872 | buf->len = (buf->len > buf->pos) ? buf->len : buf->pos; |
| 873 | } |
| 874 | |
| 875 | static scm_t_off |
| 876 | bop_seek (SCM port, scm_t_off offset, int whence) |
| 877 | #define FUNC_NAME "bop_seek" |
| 878 | { |
| 879 | scm_t_bop_buffer *buf; |
| 880 | |
| 881 | buf = SCM_BOP_BUFFER (port); |
| 882 | switch (whence) |
| 883 | { |
| 884 | case SEEK_CUR: |
| 885 | offset += (scm_t_off) buf->pos; |
| 886 | /* Fall through. */ |
| 887 | |
| 888 | case SEEK_SET: |
| 889 | if (offset < 0 || (unsigned) offset > buf->len) |
| 890 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); |
| 891 | else |
| 892 | buf->pos = offset; |
| 893 | break; |
| 894 | |
| 895 | case SEEK_END: |
| 896 | if (offset < 0 || (unsigned) offset >= buf->len) |
| 897 | scm_out_of_range (FUNC_NAME, scm_from_int (offset)); |
| 898 | else |
| 899 | buf->pos = buf->len - (offset + 1); |
| 900 | break; |
| 901 | |
| 902 | default: |
| 903 | scm_wrong_type_arg_msg (FUNC_NAME, 0, port, |
| 904 | "invalid `seek' parameter"); |
| 905 | } |
| 906 | |
| 907 | return buf->pos; |
| 908 | } |
| 909 | #undef FUNC_NAME |
| 910 | |
| 911 | /* Fetch data from a bop. */ |
| 912 | SCM_SMOB_APPLY (bytevector_output_port_procedure, |
| 913 | bop_proc_apply, 0, 0, 0, (SCM bop_proc)) |
| 914 | { |
| 915 | SCM bv; |
| 916 | scm_t_bop_buffer *buf, result_buf; |
| 917 | |
| 918 | buf = (scm_t_bop_buffer *) SCM_SMOB_DATA (bop_proc); |
| 919 | |
| 920 | result_buf = *buf; |
| 921 | bop_buffer_init (buf); |
| 922 | |
| 923 | if (result_buf.len == 0) |
| 924 | bv = scm_c_take_gc_bytevector (NULL, 0); |
| 925 | else |
| 926 | { |
| 927 | if (result_buf.total_len > result_buf.len) |
| 928 | /* Shrink the buffer. */ |
| 929 | result_buf.buffer = scm_gc_realloc ((void *) result_buf.buffer, |
| 930 | result_buf.total_len, |
| 931 | result_buf.len, |
| 932 | SCM_GC_BOP); |
| 933 | |
| 934 | bv = scm_c_take_gc_bytevector ((signed char *) result_buf.buffer, |
| 935 | result_buf.len); |
| 936 | } |
| 937 | |
| 938 | return bv; |
| 939 | } |
| 940 | |
| 941 | SCM_DEFINE (scm_open_bytevector_output_port, |
| 942 | "open-bytevector-output-port", 0, 1, 0, |
| 943 | (SCM transcoder), |
| 944 | "Return two values: an output port and a procedure. The latter " |
| 945 | "should be called with zero arguments to obtain a bytevector " |
| 946 | "containing the data accumulated by the port.") |
| 947 | #define FUNC_NAME s_scm_open_bytevector_output_port |
| 948 | { |
| 949 | if (!SCM_UNBNDP (transcoder) && !scm_is_false (transcoder)) |
| 950 | transcoders_not_implemented (); |
| 951 | |
| 952 | return (make_bop ()); |
| 953 | } |
| 954 | #undef FUNC_NAME |
| 955 | |
| 956 | static inline void |
| 957 | initialize_bytevector_output_ports (void) |
| 958 | { |
| 959 | bytevector_output_port_type = |
| 960 | scm_make_port_type ("r6rs-bytevector-output-port", |
| 961 | NULL, bop_write); |
| 962 | |
| 963 | scm_set_port_seek (bytevector_output_port_type, bop_seek); |
| 964 | } |
| 965 | |
| 966 | \f |
| 967 | /* Custom binary output port ("cbop" for short). */ |
| 968 | |
| 969 | static scm_t_bits custom_binary_output_port_type; |
| 970 | |
| 971 | /* Return the various procedures of PORT. */ |
| 972 | #define SCM_CBOP_WRITE_PROC(_port) \ |
| 973 | SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 0) |
| 974 | |
| 975 | |
| 976 | static inline SCM |
| 977 | make_cbop (SCM write_proc, SCM get_position_proc, |
| 978 | SCM set_position_proc, SCM close_proc) |
| 979 | { |
| 980 | SCM port, method_vector; |
| 981 | scm_t_port *c_port; |
| 982 | const unsigned long mode_bits = SCM_OPN | SCM_WRTNG; |
| 983 | |
| 984 | /* Store the various methods and bytevector in a vector. */ |
| 985 | method_vector = scm_c_make_vector (4, SCM_BOOL_F); |
| 986 | SCM_SIMPLE_VECTOR_SET (method_vector, 0, write_proc); |
| 987 | SCM_SIMPLE_VECTOR_SET (method_vector, 1, get_position_proc); |
| 988 | SCM_SIMPLE_VECTOR_SET (method_vector, 2, set_position_proc); |
| 989 | SCM_SIMPLE_VECTOR_SET (method_vector, 3, close_proc); |
| 990 | |
| 991 | scm_i_pthread_mutex_lock (&scm_i_port_table_mutex); |
| 992 | |
| 993 | port = scm_new_port_table_entry (custom_binary_output_port_type); |
| 994 | c_port = SCM_PTAB_ENTRY (port); |
| 995 | |
| 996 | /* Match the expectation of `binary-port?'. */ |
| 997 | c_port->encoding = NULL; |
| 998 | |
| 999 | /* Attach it the method vector. */ |
| 1000 | SCM_SETSTREAM (port, SCM_UNPACK (method_vector)); |
| 1001 | |
| 1002 | /* Have the port directly access the buffer (bytevector). */ |
| 1003 | c_port->write_buf = c_port->write_pos = c_port->write_end = NULL; |
| 1004 | c_port->write_buf_size = c_port->read_buf_size = 0; |
| 1005 | |
| 1006 | /* Mark PORT as open, writable and unbuffered. */ |
| 1007 | SCM_SET_CELL_TYPE (port, custom_binary_output_port_type | mode_bits); |
| 1008 | |
| 1009 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
| 1010 | |
| 1011 | return port; |
| 1012 | } |
| 1013 | |
| 1014 | /* Write SIZE octets from DATA to PORT. */ |
| 1015 | static void |
| 1016 | cbop_write (SCM port, const void *data, size_t size) |
| 1017 | #define FUNC_NAME "cbop_write" |
| 1018 | { |
| 1019 | long int c_result; |
| 1020 | size_t c_written; |
| 1021 | SCM bv, write_proc, result; |
| 1022 | |
| 1023 | /* XXX: Allocating a new bytevector at each `write' call is inefficient, |
| 1024 | but necessary since (1) we don't control the lifetime of the buffer |
| 1025 | pointed to by DATA, and (2) the `write!' procedure could capture the |
| 1026 | bytevector it is passed. */ |
| 1027 | bv = scm_c_make_bytevector (size); |
| 1028 | memcpy (SCM_BYTEVECTOR_CONTENTS (bv), data, size); |
| 1029 | |
| 1030 | write_proc = SCM_CBOP_WRITE_PROC (port); |
| 1031 | |
| 1032 | /* Since the `write' procedure of Guile's ports has type `void', it must |
| 1033 | try hard to write exactly SIZE bytes, regardless of how many bytes the |
| 1034 | sink can handle. */ |
| 1035 | for (c_written = 0; |
| 1036 | c_written < size; |
| 1037 | c_written += c_result) |
| 1038 | { |
| 1039 | result = scm_call_3 (write_proc, bv, |
| 1040 | scm_from_size_t (c_written), |
| 1041 | scm_from_size_t (size - c_written)); |
| 1042 | |
| 1043 | c_result = scm_to_long (result); |
| 1044 | if (SCM_UNLIKELY (c_result < 0 |
| 1045 | || (size_t) c_result > (size - c_written))) |
| 1046 | scm_wrong_type_arg_msg (FUNC_NAME, 0, result, |
| 1047 | "R6RS custom binary output port `write!' " |
| 1048 | "returned a incorrect integer"); |
| 1049 | } |
| 1050 | } |
| 1051 | #undef FUNC_NAME |
| 1052 | |
| 1053 | |
| 1054 | SCM_DEFINE (scm_make_custom_binary_output_port, |
| 1055 | "make-custom-binary-output-port", 5, 0, 0, |
| 1056 | (SCM id, SCM write_proc, SCM get_position_proc, |
| 1057 | SCM set_position_proc, SCM close_proc), |
| 1058 | "Return a new custom binary output port whose output is drained " |
| 1059 | "by invoking @var{write_proc} and passing it a bytevector, an " |
| 1060 | "index where octets should be written, and an octet count.") |
| 1061 | #define FUNC_NAME s_scm_make_custom_binary_output_port |
| 1062 | { |
| 1063 | SCM_VALIDATE_STRING (1, id); |
| 1064 | SCM_VALIDATE_PROC (2, write_proc); |
| 1065 | |
| 1066 | if (!scm_is_false (get_position_proc)) |
| 1067 | SCM_VALIDATE_PROC (3, get_position_proc); |
| 1068 | |
| 1069 | if (!scm_is_false (set_position_proc)) |
| 1070 | SCM_VALIDATE_PROC (4, set_position_proc); |
| 1071 | |
| 1072 | if (!scm_is_false (close_proc)) |
| 1073 | SCM_VALIDATE_PROC (5, close_proc); |
| 1074 | |
| 1075 | return (make_cbop (write_proc, get_position_proc, set_position_proc, |
| 1076 | close_proc)); |
| 1077 | } |
| 1078 | #undef FUNC_NAME |
| 1079 | |
| 1080 | |
| 1081 | /* Instantiate the custom binary output port type. */ |
| 1082 | static inline void |
| 1083 | initialize_custom_binary_output_ports (void) |
| 1084 | { |
| 1085 | custom_binary_output_port_type = |
| 1086 | scm_make_port_type ("r6rs-custom-binary-output-port", |
| 1087 | NULL, cbop_write); |
| 1088 | |
| 1089 | scm_set_port_seek (custom_binary_output_port_type, cbp_seek); |
| 1090 | scm_set_port_close (custom_binary_output_port_type, cbp_close); |
| 1091 | } |
| 1092 | |
| 1093 | \f |
| 1094 | /* Transcoded ports ("tp" for short). */ |
| 1095 | static scm_t_bits transcoded_port_type = 0; |
| 1096 | |
| 1097 | #define TP_INPUT_BUFFER_SIZE 4096 |
| 1098 | |
| 1099 | #define SCM_TP_BINARY_PORT(_port) SCM_PACK (SCM_STREAM (_port)) |
| 1100 | |
| 1101 | static inline SCM |
| 1102 | make_tp (SCM binary_port, unsigned long mode) |
| 1103 | { |
| 1104 | SCM port; |
| 1105 | scm_t_port *c_port; |
| 1106 | const unsigned long mode_bits = SCM_OPN | mode; |
| 1107 | |
| 1108 | scm_i_pthread_mutex_lock (&scm_i_port_table_mutex); |
| 1109 | |
| 1110 | port = scm_new_port_table_entry (transcoded_port_type); |
| 1111 | |
| 1112 | SCM_SETSTREAM (port, SCM_UNPACK (binary_port)); |
| 1113 | |
| 1114 | SCM_SET_CELL_TYPE (port, transcoded_port_type | mode_bits); |
| 1115 | |
| 1116 | if (SCM_INPUT_PORT_P (port)) |
| 1117 | { |
| 1118 | c_port = SCM_PTAB_ENTRY (port); |
| 1119 | c_port->read_buf = scm_gc_malloc_pointerless (TP_INPUT_BUFFER_SIZE, |
| 1120 | "port buffer"); |
| 1121 | c_port->read_pos = c_port->read_end = c_port->read_buf; |
| 1122 | c_port->read_buf_size = TP_INPUT_BUFFER_SIZE; |
| 1123 | |
| 1124 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0); |
| 1125 | } |
| 1126 | |
| 1127 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
| 1128 | |
| 1129 | return port; |
| 1130 | } |
| 1131 | |
| 1132 | static void |
| 1133 | tp_write (SCM port, const void *data, size_t size) |
| 1134 | { |
| 1135 | scm_c_write (SCM_TP_BINARY_PORT (port), data, size); |
| 1136 | } |
| 1137 | |
| 1138 | static int |
| 1139 | tp_fill_input (SCM port) |
| 1140 | { |
| 1141 | size_t count; |
| 1142 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); |
| 1143 | SCM bport = SCM_TP_BINARY_PORT (port); |
| 1144 | scm_t_port *c_bport = SCM_PTAB_ENTRY (bport); |
| 1145 | |
| 1146 | /* We can't use `scm_c_read' here, since it blocks until the whole |
| 1147 | block has been read or EOF. */ |
| 1148 | |
| 1149 | if (c_bport->rw_active == SCM_PORT_WRITE) |
| 1150 | scm_force_output (bport); |
| 1151 | |
| 1152 | if (c_bport->read_pos >= c_bport->read_end) |
| 1153 | scm_fill_input (bport); |
| 1154 | |
| 1155 | count = c_bport->read_end - c_bport->read_pos; |
| 1156 | if (count > c_port->read_buf_size) |
| 1157 | count = c_port->read_buf_size; |
| 1158 | |
| 1159 | memcpy (c_port->read_buf, c_bport->read_pos, count); |
| 1160 | c_bport->read_pos += count; |
| 1161 | |
| 1162 | if (c_bport->rw_random) |
| 1163 | c_bport->rw_active = SCM_PORT_READ; |
| 1164 | |
| 1165 | if (count == 0) |
| 1166 | return EOF; |
| 1167 | else |
| 1168 | { |
| 1169 | c_port->read_pos = c_port->read_buf; |
| 1170 | c_port->read_end = c_port->read_buf + count; |
| 1171 | return *c_port->read_buf; |
| 1172 | } |
| 1173 | } |
| 1174 | |
| 1175 | static void |
| 1176 | tp_flush (SCM port) |
| 1177 | { |
| 1178 | SCM binary_port = SCM_TP_BINARY_PORT (port); |
| 1179 | scm_t_port *c_port = SCM_PTAB_ENTRY (port); |
| 1180 | size_t count = c_port->write_pos - c_port->write_buf; |
| 1181 | |
| 1182 | /* As the runtime will try to flush all ports upon exit, we test for |
| 1183 | the underlying port still being open here. Otherwise, when you |
| 1184 | would explicitly close the underlying port and the transcoded port |
| 1185 | still had data outstanding, you'd get an exception on Guile exit. |
| 1186 | |
| 1187 | We just throw away the data when the underlying port is closed. */ |
| 1188 | |
| 1189 | if (SCM_OPOUTPORTP (binary_port)) |
| 1190 | scm_c_write (binary_port, c_port->write_buf, count); |
| 1191 | |
| 1192 | c_port->write_pos = c_port->write_buf; |
| 1193 | c_port->rw_active = SCM_PORT_NEITHER; |
| 1194 | |
| 1195 | if (SCM_OPOUTPORTP (binary_port)) |
| 1196 | scm_force_output (binary_port); |
| 1197 | } |
| 1198 | |
| 1199 | static int |
| 1200 | tp_close (SCM port) |
| 1201 | { |
| 1202 | if (SCM_OUTPUT_PORT_P (port)) |
| 1203 | tp_flush (port); |
| 1204 | return scm_is_true (scm_close_port (SCM_TP_BINARY_PORT (port))) ? 0 : -1; |
| 1205 | } |
| 1206 | |
| 1207 | static inline void |
| 1208 | initialize_transcoded_ports (void) |
| 1209 | { |
| 1210 | transcoded_port_type = |
| 1211 | scm_make_port_type ("r6rs-transcoded-port", tp_fill_input, tp_write); |
| 1212 | |
| 1213 | scm_set_port_flush (transcoded_port_type, tp_flush); |
| 1214 | scm_set_port_close (transcoded_port_type, tp_close); |
| 1215 | } |
| 1216 | |
| 1217 | SCM_DEFINE (scm_i_make_transcoded_port, |
| 1218 | "%make-transcoded-port", 1, 0, 0, |
| 1219 | (SCM port), |
| 1220 | "Return a new port which reads and writes to @var{port}") |
| 1221 | #define FUNC_NAME s_scm_i_make_transcoded_port |
| 1222 | { |
| 1223 | SCM result; |
| 1224 | unsigned long mode = 0; |
| 1225 | |
| 1226 | SCM_VALIDATE_PORT (SCM_ARG1, port); |
| 1227 | |
| 1228 | if (scm_is_true (scm_output_port_p (port))) |
| 1229 | mode |= SCM_WRTNG; |
| 1230 | else if (scm_is_true (scm_input_port_p (port))) |
| 1231 | mode |= SCM_RDNG; |
| 1232 | |
| 1233 | result = make_tp (port, mode); |
| 1234 | |
| 1235 | /* FIXME: We should actually close `port' "in a special way" here, |
| 1236 | according to R6RS. As there is no way to do that in Guile without |
| 1237 | rendering the underlying port unusable for our purposes as well, we |
| 1238 | just leave it open. */ |
| 1239 | |
| 1240 | return result; |
| 1241 | } |
| 1242 | #undef FUNC_NAME |
| 1243 | |
| 1244 | \f |
| 1245 | /* Textual I/O */ |
| 1246 | |
| 1247 | SCM_DEFINE (scm_get_string_n_x, |
| 1248 | "get-string-n!", 4, 0, 0, |
| 1249 | (SCM port, SCM str, SCM start, SCM count), |
| 1250 | "Read up to @var{count} characters from @var{port} into " |
| 1251 | "@var{str}, starting at @var{start}. If no characters " |
| 1252 | "can be read before the end of file is encountered, the end " |
| 1253 | "of file object is returned. Otherwise, the number of " |
| 1254 | "characters read is returned.") |
| 1255 | #define FUNC_NAME s_scm_get_string_n_x |
| 1256 | { |
| 1257 | size_t c_start, c_count, c_len, c_end, j; |
| 1258 | scm_t_wchar c; |
| 1259 | |
| 1260 | SCM_VALIDATE_OPINPORT (1, port); |
| 1261 | SCM_VALIDATE_STRING (2, str); |
| 1262 | c_len = scm_c_string_length (str); |
| 1263 | c_start = scm_to_size_t (start); |
| 1264 | c_count = scm_to_size_t (count); |
| 1265 | c_end = c_start + c_count; |
| 1266 | |
| 1267 | if (SCM_UNLIKELY (c_end > c_len)) |
| 1268 | scm_out_of_range (FUNC_NAME, count); |
| 1269 | |
| 1270 | for (j = c_start; j < c_end; j++) |
| 1271 | { |
| 1272 | c = scm_getc (port); |
| 1273 | if (c == EOF) |
| 1274 | { |
| 1275 | size_t chars_read = j - c_start; |
| 1276 | return chars_read == 0 ? SCM_EOF_VAL : scm_from_size_t (chars_read); |
| 1277 | } |
| 1278 | scm_c_string_set_x (str, j, SCM_MAKE_CHAR (c)); |
| 1279 | } |
| 1280 | return count; |
| 1281 | } |
| 1282 | #undef FUNC_NAME |
| 1283 | |
| 1284 | \f |
| 1285 | /* Initialization. */ |
| 1286 | |
| 1287 | void |
| 1288 | scm_register_r6rs_ports (void) |
| 1289 | { |
| 1290 | scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION, |
| 1291 | "scm_init_r6rs_ports", |
| 1292 | (scm_t_extension_init_func) scm_init_r6rs_ports, |
| 1293 | NULL); |
| 1294 | } |
| 1295 | |
| 1296 | void |
| 1297 | scm_init_r6rs_ports (void) |
| 1298 | { |
| 1299 | #include "libguile/r6rs-ports.x" |
| 1300 | |
| 1301 | initialize_bytevector_input_ports (); |
| 1302 | initialize_custom_binary_input_ports (); |
| 1303 | initialize_bytevector_output_ports (); |
| 1304 | initialize_custom_binary_output_ports (); |
| 1305 | initialize_transcoded_ports (); |
| 1306 | } |