| 1 | /* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, |
| 2 | * 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public License |
| 6 | * as published by the Free Software Foundation; either version 3 of |
| 7 | * the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This library is distributed in the hope that it will be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public |
| 15 | * License along with this library; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 17 | * 02110-1301 USA |
| 18 | */ |
| 19 | |
| 20 | |
| 21 | \f |
| 22 | /* Headers. */ |
| 23 | |
| 24 | #define _LARGEFILE64_SOURCE /* ask for stat64 etc */ |
| 25 | |
| 26 | #ifdef HAVE_CONFIG_H |
| 27 | # include <config.h> |
| 28 | #endif |
| 29 | |
| 30 | #include <stdio.h> |
| 31 | #include <errno.h> |
| 32 | #include <fcntl.h> /* for chsize on mingw */ |
| 33 | #include <assert.h> |
| 34 | #include <iconv.h> |
| 35 | #include <uniconv.h> |
| 36 | #include <unistr.h> |
| 37 | #include <striconveh.h> |
| 38 | |
| 39 | #include <assert.h> |
| 40 | |
| 41 | #include "libguile/_scm.h" |
| 42 | #include "libguile/async.h" |
| 43 | #include "libguile/deprecation.h" |
| 44 | #include "libguile/eval.h" |
| 45 | #include "libguile/fports.h" /* direct access for seek and truncate */ |
| 46 | #include "libguile/goops.h" |
| 47 | #include "libguile/smob.h" |
| 48 | #include "libguile/chars.h" |
| 49 | #include "libguile/dynwind.h" |
| 50 | |
| 51 | #include "libguile/keywords.h" |
| 52 | #include "libguile/hashtab.h" |
| 53 | #include "libguile/root.h" |
| 54 | #include "libguile/strings.h" |
| 55 | #include "libguile/mallocs.h" |
| 56 | #include "libguile/validate.h" |
| 57 | #include "libguile/ports.h" |
| 58 | #include "libguile/vectors.h" |
| 59 | #include "libguile/weak-set.h" |
| 60 | #include "libguile/fluids.h" |
| 61 | #include "libguile/eq.h" |
| 62 | |
| 63 | #ifdef HAVE_STRING_H |
| 64 | #include <string.h> |
| 65 | #endif |
| 66 | |
| 67 | #ifdef HAVE_IO_H |
| 68 | #include <io.h> |
| 69 | #endif |
| 70 | |
| 71 | #ifdef HAVE_UNISTD_H |
| 72 | #include <unistd.h> |
| 73 | #endif |
| 74 | |
| 75 | #ifdef HAVE_SYS_IOCTL_H |
| 76 | #include <sys/ioctl.h> |
| 77 | #endif |
| 78 | |
| 79 | /* Mingw (version 3.4.5, circa 2006) has ftruncate as an alias for chsize |
| 80 | already, but have this code here in case that wasn't so in past versions, |
| 81 | or perhaps to help other minimal DOS environments. |
| 82 | |
| 83 | gnulib ftruncate.c has code using fcntl F_CHSIZE and F_FREESP, which |
| 84 | might be possibilities if we've got other systems without ftruncate. */ |
| 85 | |
| 86 | #if defined HAVE_CHSIZE && ! defined HAVE_FTRUNCATE |
| 87 | #define ftruncate(fd, size) chsize (fd, size) |
| 88 | #undef HAVE_FTRUNCATE |
| 89 | #define HAVE_FTRUNCATE 1 |
| 90 | #endif |
| 91 | |
| 92 | \f |
| 93 | /* The port kind table --- a dynamically resized array of port types. */ |
| 94 | |
| 95 | |
| 96 | /* scm_ptobs scm_numptob |
| 97 | * implement a dynamically resized array of ptob records. |
| 98 | * Indexes into this table are used when generating type |
| 99 | * tags for smobjects (if you know a tag you can get an index and conversely). |
| 100 | */ |
| 101 | static scm_t_ptob_descriptor **scm_ptobs = NULL; |
| 102 | static long scm_numptob = 0; /* Number of port types. */ |
| 103 | static long scm_ptobs_size = 0; /* Number of slots in the port type |
| 104 | table. */ |
| 105 | static scm_i_pthread_mutex_t scm_ptobs_lock = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
| 106 | |
| 107 | long |
| 108 | scm_c_num_port_types (void) |
| 109 | { |
| 110 | long ret; |
| 111 | |
| 112 | scm_i_pthread_mutex_lock (&scm_ptobs_lock); |
| 113 | ret = scm_numptob; |
| 114 | scm_i_pthread_mutex_unlock (&scm_ptobs_lock); |
| 115 | |
| 116 | return ret; |
| 117 | } |
| 118 | |
| 119 | scm_t_ptob_descriptor* |
| 120 | scm_c_port_type_ref (long ptobnum) |
| 121 | { |
| 122 | scm_t_ptob_descriptor *ret = NULL; |
| 123 | |
| 124 | scm_i_pthread_mutex_lock (&scm_ptobs_lock); |
| 125 | |
| 126 | if (0 <= ptobnum && ptobnum < scm_numptob) |
| 127 | ret = scm_ptobs[ptobnum]; |
| 128 | |
| 129 | scm_i_pthread_mutex_unlock (&scm_ptobs_lock); |
| 130 | |
| 131 | if (!ret) |
| 132 | scm_out_of_range ("scm_c_port_type_ref", scm_from_long (ptobnum)); |
| 133 | |
| 134 | return ret; |
| 135 | } |
| 136 | |
| 137 | long |
| 138 | scm_c_port_type_add_x (scm_t_ptob_descriptor *desc) |
| 139 | { |
| 140 | long ret = -1; |
| 141 | |
| 142 | scm_i_pthread_mutex_lock (&scm_ptobs_lock); |
| 143 | |
| 144 | if (scm_numptob + 1 < SCM_I_MAX_PORT_TYPE_COUNT) |
| 145 | { |
| 146 | if (scm_numptob == scm_ptobs_size) |
| 147 | { |
| 148 | unsigned long old_size = scm_ptobs_size; |
| 149 | scm_t_ptob_descriptor **old_ptobs = scm_ptobs; |
| 150 | |
| 151 | /* Currently there are only 9 predefined port types, so one |
| 152 | resize will cover it. */ |
| 153 | scm_ptobs_size = old_size + 10; |
| 154 | |
| 155 | if (scm_ptobs_size >= SCM_I_MAX_PORT_TYPE_COUNT) |
| 156 | scm_ptobs_size = SCM_I_MAX_PORT_TYPE_COUNT; |
| 157 | |
| 158 | scm_ptobs = scm_gc_malloc (sizeof (*scm_ptobs) * scm_ptobs_size, |
| 159 | "scm_ptobs"); |
| 160 | |
| 161 | memcpy (scm_ptobs, old_ptobs, sizeof (*scm_ptobs) * scm_numptob); |
| 162 | } |
| 163 | |
| 164 | ret = scm_numptob++; |
| 165 | scm_ptobs[ret] = desc; |
| 166 | } |
| 167 | |
| 168 | scm_i_pthread_mutex_unlock (&scm_ptobs_lock); |
| 169 | |
| 170 | if (ret < 0) |
| 171 | scm_out_of_range ("scm_c_port_type_add_x", scm_from_long (scm_numptob)); |
| 172 | |
| 173 | return ret; |
| 174 | } |
| 175 | |
| 176 | /* |
| 177 | * We choose to use an interface similar to the smob interface with |
| 178 | * fill_input and write as standard fields, passed to the port |
| 179 | * type constructor, and optional fields set by setters. |
| 180 | */ |
| 181 | |
| 182 | static void |
| 183 | flush_port_default (SCM port SCM_UNUSED) |
| 184 | { |
| 185 | } |
| 186 | |
| 187 | static void |
| 188 | end_input_default (SCM port SCM_UNUSED, int offset SCM_UNUSED) |
| 189 | { |
| 190 | } |
| 191 | |
| 192 | scm_t_bits |
| 193 | scm_make_port_type (char *name, |
| 194 | int (*fill_input) (SCM port), |
| 195 | void (*write) (SCM port, const void *data, size_t size)) |
| 196 | { |
| 197 | scm_t_ptob_descriptor *desc; |
| 198 | long ptobnum; |
| 199 | |
| 200 | desc = scm_gc_malloc_pointerless (sizeof (*desc), "port-type"); |
| 201 | memset (desc, 0, sizeof (*desc)); |
| 202 | |
| 203 | desc->name = name; |
| 204 | desc->print = scm_port_print; |
| 205 | desc->write = write; |
| 206 | desc->flush = flush_port_default; |
| 207 | desc->end_input = end_input_default; |
| 208 | desc->fill_input = fill_input; |
| 209 | |
| 210 | ptobnum = scm_c_port_type_add_x (desc); |
| 211 | |
| 212 | /* Make a class object if GOOPS is present. */ |
| 213 | if (SCM_UNPACK (scm_port_class[0]) != 0) |
| 214 | scm_make_port_classes (ptobnum, name); |
| 215 | |
| 216 | return scm_tc7_port + ptobnum * 256; |
| 217 | } |
| 218 | |
| 219 | void |
| 220 | scm_set_port_mark (scm_t_bits tc, SCM (*mark) (SCM)) |
| 221 | { |
| 222 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->mark = mark; |
| 223 | } |
| 224 | |
| 225 | void |
| 226 | scm_set_port_free (scm_t_bits tc, size_t (*free) (SCM)) |
| 227 | { |
| 228 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->free = free; |
| 229 | } |
| 230 | |
| 231 | void |
| 232 | scm_set_port_print (scm_t_bits tc, int (*print) (SCM exp, SCM port, |
| 233 | scm_print_state *pstate)) |
| 234 | { |
| 235 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->print = print; |
| 236 | } |
| 237 | |
| 238 | void |
| 239 | scm_set_port_equalp (scm_t_bits tc, SCM (*equalp) (SCM, SCM)) |
| 240 | { |
| 241 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->equalp = equalp; |
| 242 | } |
| 243 | |
| 244 | void |
| 245 | scm_set_port_close (scm_t_bits tc, int (*close) (SCM)) |
| 246 | { |
| 247 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->close = close; |
| 248 | } |
| 249 | |
| 250 | void |
| 251 | scm_set_port_flush (scm_t_bits tc, void (*flush) (SCM port)) |
| 252 | { |
| 253 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->flush = flush; |
| 254 | } |
| 255 | |
| 256 | void |
| 257 | scm_set_port_end_input (scm_t_bits tc, void (*end_input) (SCM port, int offset)) |
| 258 | { |
| 259 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->end_input = end_input; |
| 260 | } |
| 261 | |
| 262 | void |
| 263 | scm_set_port_seek (scm_t_bits tc, scm_t_off (*seek) (SCM, scm_t_off, int)) |
| 264 | { |
| 265 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->seek = seek; |
| 266 | } |
| 267 | |
| 268 | void |
| 269 | scm_set_port_truncate (scm_t_bits tc, void (*truncate) (SCM, scm_t_off)) |
| 270 | { |
| 271 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->truncate = truncate; |
| 272 | } |
| 273 | |
| 274 | void |
| 275 | scm_set_port_input_waiting (scm_t_bits tc, int (*input_waiting) (SCM)) |
| 276 | { |
| 277 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->input_waiting = input_waiting; |
| 278 | } |
| 279 | |
| 280 | \f |
| 281 | |
| 282 | /* Standard ports --- current input, output, error, and more(!). */ |
| 283 | |
| 284 | static SCM cur_inport_fluid = SCM_BOOL_F; |
| 285 | static SCM cur_outport_fluid = SCM_BOOL_F; |
| 286 | static SCM cur_errport_fluid = SCM_BOOL_F; |
| 287 | static SCM cur_loadport_fluid = SCM_BOOL_F; |
| 288 | |
| 289 | SCM_DEFINE (scm_current_input_port, "current-input-port", 0, 0, 0, |
| 290 | (), |
| 291 | "Return the current input port. This is the default port used\n" |
| 292 | "by many input procedures. Initially, @code{current-input-port}\n" |
| 293 | "returns the @dfn{standard input} in Unix and C terminology.") |
| 294 | #define FUNC_NAME s_scm_current_input_port |
| 295 | { |
| 296 | if (scm_is_true (cur_inport_fluid)) |
| 297 | return scm_fluid_ref (cur_inport_fluid); |
| 298 | else |
| 299 | return SCM_BOOL_F; |
| 300 | } |
| 301 | #undef FUNC_NAME |
| 302 | |
| 303 | SCM_DEFINE (scm_current_output_port, "current-output-port", 0, 0, 0, |
| 304 | (), |
| 305 | "Return the current output port. This is the default port used\n" |
| 306 | "by many output procedures. Initially,\n" |
| 307 | "@code{current-output-port} returns the @dfn{standard output} in\n" |
| 308 | "Unix and C terminology.") |
| 309 | #define FUNC_NAME s_scm_current_output_port |
| 310 | { |
| 311 | if (scm_is_true (cur_outport_fluid)) |
| 312 | return scm_fluid_ref (cur_outport_fluid); |
| 313 | else |
| 314 | return SCM_BOOL_F; |
| 315 | } |
| 316 | #undef FUNC_NAME |
| 317 | |
| 318 | SCM_DEFINE (scm_current_error_port, "current-error-port", 0, 0, 0, |
| 319 | (), |
| 320 | "Return the port to which errors and warnings should be sent (the\n" |
| 321 | "@dfn{standard error} in Unix and C terminology).") |
| 322 | #define FUNC_NAME s_scm_current_error_port |
| 323 | { |
| 324 | if (scm_is_true (cur_errport_fluid)) |
| 325 | return scm_fluid_ref (cur_errport_fluid); |
| 326 | else |
| 327 | return SCM_BOOL_F; |
| 328 | } |
| 329 | #undef FUNC_NAME |
| 330 | |
| 331 | SCM_DEFINE (scm_current_load_port, "current-load-port", 0, 0, 0, |
| 332 | (), |
| 333 | "Return the current-load-port.\n" |
| 334 | "The load port is used internally by @code{primitive-load}.") |
| 335 | #define FUNC_NAME s_scm_current_load_port |
| 336 | { |
| 337 | return scm_fluid_ref (cur_loadport_fluid); |
| 338 | } |
| 339 | #undef FUNC_NAME |
| 340 | |
| 341 | SCM_DEFINE (scm_set_current_input_port, "set-current-input-port", 1, 0, 0, |
| 342 | (SCM port), |
| 343 | "@deffnx {Scheme Procedure} set-current-output-port port\n" |
| 344 | "@deffnx {Scheme Procedure} set-current-error-port port\n" |
| 345 | "Change the ports returned by @code{current-input-port},\n" |
| 346 | "@code{current-output-port} and @code{current-error-port}, respectively,\n" |
| 347 | "so that they use the supplied @var{port} for input or output.") |
| 348 | #define FUNC_NAME s_scm_set_current_input_port |
| 349 | { |
| 350 | SCM oinp = scm_fluid_ref (cur_inport_fluid); |
| 351 | SCM_VALIDATE_OPINPORT (1, port); |
| 352 | scm_fluid_set_x (cur_inport_fluid, port); |
| 353 | return oinp; |
| 354 | } |
| 355 | #undef FUNC_NAME |
| 356 | |
| 357 | |
| 358 | SCM_DEFINE (scm_set_current_output_port, "set-current-output-port", 1, 0, 0, |
| 359 | (SCM port), |
| 360 | "Set the current default output port to @var{port}.") |
| 361 | #define FUNC_NAME s_scm_set_current_output_port |
| 362 | { |
| 363 | SCM ooutp = scm_fluid_ref (cur_outport_fluid); |
| 364 | port = SCM_COERCE_OUTPORT (port); |
| 365 | SCM_VALIDATE_OPOUTPORT (1, port); |
| 366 | scm_fluid_set_x (cur_outport_fluid, port); |
| 367 | return ooutp; |
| 368 | } |
| 369 | #undef FUNC_NAME |
| 370 | |
| 371 | |
| 372 | SCM_DEFINE (scm_set_current_error_port, "set-current-error-port", 1, 0, 0, |
| 373 | (SCM port), |
| 374 | "Set the current default error port to @var{port}.") |
| 375 | #define FUNC_NAME s_scm_set_current_error_port |
| 376 | { |
| 377 | SCM oerrp = scm_fluid_ref (cur_errport_fluid); |
| 378 | port = SCM_COERCE_OUTPORT (port); |
| 379 | SCM_VALIDATE_OPOUTPORT (1, port); |
| 380 | scm_fluid_set_x (cur_errport_fluid, port); |
| 381 | return oerrp; |
| 382 | } |
| 383 | #undef FUNC_NAME |
| 384 | |
| 385 | void |
| 386 | scm_dynwind_current_input_port (SCM port) |
| 387 | #define FUNC_NAME NULL |
| 388 | { |
| 389 | SCM_VALIDATE_OPINPORT (1, port); |
| 390 | scm_dynwind_fluid (cur_inport_fluid, port); |
| 391 | } |
| 392 | #undef FUNC_NAME |
| 393 | |
| 394 | void |
| 395 | scm_dynwind_current_output_port (SCM port) |
| 396 | #define FUNC_NAME NULL |
| 397 | { |
| 398 | port = SCM_COERCE_OUTPORT (port); |
| 399 | SCM_VALIDATE_OPOUTPORT (1, port); |
| 400 | scm_dynwind_fluid (cur_outport_fluid, port); |
| 401 | } |
| 402 | #undef FUNC_NAME |
| 403 | |
| 404 | void |
| 405 | scm_dynwind_current_error_port (SCM port) |
| 406 | #define FUNC_NAME NULL |
| 407 | { |
| 408 | port = SCM_COERCE_OUTPORT (port); |
| 409 | SCM_VALIDATE_OPOUTPORT (1, port); |
| 410 | scm_dynwind_fluid (cur_errport_fluid, port); |
| 411 | } |
| 412 | #undef FUNC_NAME |
| 413 | |
| 414 | void |
| 415 | scm_i_dynwind_current_load_port (SCM port) |
| 416 | { |
| 417 | scm_dynwind_fluid (cur_loadport_fluid, port); |
| 418 | } |
| 419 | |
| 420 | |
| 421 | \f |
| 422 | |
| 423 | /* Retrieving a port's mode. */ |
| 424 | |
| 425 | /* Return the flags that characterize a port based on the mode |
| 426 | * string used to open a file for that port. |
| 427 | * |
| 428 | * See PORT FLAGS in scm.h |
| 429 | */ |
| 430 | |
| 431 | static long |
| 432 | scm_i_mode_bits_n (SCM modes) |
| 433 | { |
| 434 | return (SCM_OPN |
| 435 | | (scm_i_string_contains_char (modes, 'r') |
| 436 | || scm_i_string_contains_char (modes, '+') ? SCM_RDNG : 0) |
| 437 | | (scm_i_string_contains_char (modes, 'w') |
| 438 | || scm_i_string_contains_char (modes, 'a') |
| 439 | || scm_i_string_contains_char (modes, '+') ? SCM_WRTNG : 0) |
| 440 | | (scm_i_string_contains_char (modes, '0') ? SCM_BUF0 : 0) |
| 441 | | (scm_i_string_contains_char (modes, 'l') ? SCM_BUFLINE : 0)); |
| 442 | } |
| 443 | |
| 444 | long |
| 445 | scm_mode_bits (char *modes) |
| 446 | { |
| 447 | return scm_i_mode_bits (scm_from_locale_string (modes)); |
| 448 | } |
| 449 | |
| 450 | long |
| 451 | scm_i_mode_bits (SCM modes) |
| 452 | { |
| 453 | long bits; |
| 454 | |
| 455 | if (!scm_is_string (modes)) |
| 456 | scm_wrong_type_arg_msg (NULL, 0, modes, "string"); |
| 457 | |
| 458 | bits = scm_i_mode_bits_n (modes); |
| 459 | scm_remember_upto_here_1 (modes); |
| 460 | return bits; |
| 461 | } |
| 462 | |
| 463 | /* Return the mode flags from an open port. |
| 464 | * Some modes such as "append" are only used when opening |
| 465 | * a file and are not returned here. */ |
| 466 | |
| 467 | SCM_DEFINE (scm_port_mode, "port-mode", 1, 0, 0, |
| 468 | (SCM port), |
| 469 | "Return the port modes associated with the open port @var{port}.\n" |
| 470 | "These will not necessarily be identical to the modes used when\n" |
| 471 | "the port was opened, since modes such as \"append\" which are\n" |
| 472 | "used only during port creation are not retained.") |
| 473 | #define FUNC_NAME s_scm_port_mode |
| 474 | { |
| 475 | char modes[4]; |
| 476 | modes[0] = '\0'; |
| 477 | |
| 478 | port = SCM_COERCE_OUTPORT (port); |
| 479 | SCM_VALIDATE_OPPORT (1, port); |
| 480 | if (SCM_CELL_WORD_0 (port) & SCM_RDNG) { |
| 481 | if (SCM_CELL_WORD_0 (port) & SCM_WRTNG) |
| 482 | strcpy (modes, "r+"); |
| 483 | else |
| 484 | strcpy (modes, "r"); |
| 485 | } |
| 486 | else if (SCM_CELL_WORD_0 (port) & SCM_WRTNG) |
| 487 | strcpy (modes, "w"); |
| 488 | if (SCM_CELL_WORD_0 (port) & SCM_BUF0) |
| 489 | strcat (modes, "0"); |
| 490 | |
| 491 | return scm_from_latin1_string (modes); |
| 492 | } |
| 493 | #undef FUNC_NAME |
| 494 | |
| 495 | |
| 496 | \f |
| 497 | |
| 498 | /* The port table --- a weak set of all ports. |
| 499 | |
| 500 | We need a global registry of ports to flush them all at exit, and to |
| 501 | get all the ports matching a file descriptor. */ |
| 502 | SCM scm_i_port_weak_set; |
| 503 | |
| 504 | |
| 505 | \f |
| 506 | |
| 507 | /* Port finalization. */ |
| 508 | |
| 509 | static void finalize_port (GC_PTR, GC_PTR); |
| 510 | |
| 511 | /* Register a finalizer for PORT. */ |
| 512 | static SCM_C_INLINE_KEYWORD void |
| 513 | register_finalizer_for_port (SCM port) |
| 514 | { |
| 515 | GC_finalization_proc prev_finalizer; |
| 516 | GC_PTR prev_finalization_data; |
| 517 | |
| 518 | /* Register a finalizer for PORT so that its iconv CDs get freed and |
| 519 | optionally its type's `free' function gets called. */ |
| 520 | GC_REGISTER_FINALIZER_NO_ORDER (SCM_HEAP_OBJECT_BASE (port), |
| 521 | finalize_port, 0, |
| 522 | &prev_finalizer, |
| 523 | &prev_finalization_data); |
| 524 | } |
| 525 | |
| 526 | /* Finalize the object (a port) pointed to by PTR. */ |
| 527 | static void |
| 528 | finalize_port (GC_PTR ptr, GC_PTR data) |
| 529 | { |
| 530 | SCM port = SCM_PACK_POINTER (ptr); |
| 531 | |
| 532 | if (!SCM_PORTP (port)) |
| 533 | abort (); |
| 534 | |
| 535 | if (SCM_OPENP (port)) |
| 536 | { |
| 537 | if (SCM_REVEALED (port) > 0) |
| 538 | /* Keep "revealed" ports alive and re-register a finalizer. */ |
| 539 | register_finalizer_for_port (port); |
| 540 | else |
| 541 | { |
| 542 | scm_t_ptob_descriptor *ptob = SCM_PORT_DESCRIPTOR (port); |
| 543 | scm_t_port *entry; |
| 544 | |
| 545 | if (ptob->free) |
| 546 | /* Yes, I really do mean `free' rather than `close'. `close' |
| 547 | is for explicit `close-port' by user. */ |
| 548 | ptob->free (port); |
| 549 | |
| 550 | entry = SCM_PTAB_ENTRY (port); |
| 551 | |
| 552 | if (entry->input_cd != (iconv_t) -1) |
| 553 | iconv_close (entry->input_cd); |
| 554 | if (entry->output_cd != (iconv_t) -1) |
| 555 | iconv_close (entry->output_cd); |
| 556 | |
| 557 | SCM_SETSTREAM (port, 0); |
| 558 | SCM_CLR_PORT_OPEN_FLAG (port); |
| 559 | |
| 560 | scm_gc_ports_collected++; |
| 561 | } |
| 562 | } |
| 563 | } |
| 564 | |
| 565 | |
| 566 | \f |
| 567 | |
| 568 | SCM |
| 569 | scm_c_make_port_with_encoding (scm_t_bits tag, unsigned long mode_bits, |
| 570 | const char *encoding, |
| 571 | scm_t_string_failed_conversion_handler handler, |
| 572 | scm_t_bits stream) |
| 573 | { |
| 574 | SCM ret; |
| 575 | scm_t_port *entry; |
| 576 | scm_t_ptob_descriptor *ptob; |
| 577 | |
| 578 | entry = (scm_t_port *) scm_gc_calloc (sizeof (scm_t_port), "port"); |
| 579 | ptob = scm_c_port_type_ref (SCM_TC2PTOBNUM (tag)); |
| 580 | |
| 581 | ret = scm_words (tag | mode_bits, 3); |
| 582 | SCM_SET_CELL_WORD_1 (ret, (scm_t_bits) entry); |
| 583 | SCM_SET_CELL_WORD_2 (ret, (scm_t_bits) ptob); |
| 584 | |
| 585 | #if SCM_USE_PTHREAD_THREADS |
| 586 | scm_i_pthread_mutex_init (&entry->lock, scm_i_pthread_mutexattr_recursive); |
| 587 | #endif |
| 588 | |
| 589 | entry->file_name = SCM_BOOL_F; |
| 590 | entry->rw_active = SCM_PORT_NEITHER; |
| 591 | entry->port = ret; |
| 592 | entry->stream = stream; |
| 593 | entry->encoding = encoding ? scm_gc_strdup (encoding, "port") : NULL; |
| 594 | /* The conversion descriptors will be opened lazily. */ |
| 595 | entry->input_cd = (iconv_t) -1; |
| 596 | entry->output_cd = (iconv_t) -1; |
| 597 | entry->ilseq_handler = handler; |
| 598 | |
| 599 | scm_weak_set_add_x (scm_i_port_weak_set, ret); |
| 600 | |
| 601 | /* For each new port, register a finalizer so that it port type's free |
| 602 | function can be invoked eventually. */ |
| 603 | register_finalizer_for_port (ret); |
| 604 | |
| 605 | return ret; |
| 606 | } |
| 607 | |
| 608 | SCM |
| 609 | scm_c_make_port (scm_t_bits tag, unsigned long mode_bits, scm_t_bits stream) |
| 610 | { |
| 611 | return scm_c_make_port_with_encoding (tag, mode_bits, |
| 612 | scm_i_default_port_encoding (), |
| 613 | scm_i_get_conversion_strategy (SCM_BOOL_F), |
| 614 | stream); |
| 615 | } |
| 616 | |
| 617 | SCM |
| 618 | scm_new_port_table_entry (scm_t_bits tag) |
| 619 | { |
| 620 | return scm_c_make_port (tag, 0, 0); |
| 621 | } |
| 622 | |
| 623 | /* Remove a port from the table and destroy it. */ |
| 624 | |
| 625 | static void |
| 626 | scm_i_remove_port (SCM port) |
| 627 | #define FUNC_NAME "scm_remove_port" |
| 628 | { |
| 629 | scm_t_port *p; |
| 630 | |
| 631 | p = SCM_PTAB_ENTRY (port); |
| 632 | scm_port_non_buffer (p); |
| 633 | SCM_SETPTAB_ENTRY (port, 0); |
| 634 | scm_weak_set_remove_x (scm_i_port_weak_set, port); |
| 635 | |
| 636 | p->putback_buf = NULL; |
| 637 | p->putback_buf_size = 0; |
| 638 | |
| 639 | if (p->input_cd != (iconv_t) -1) |
| 640 | { |
| 641 | iconv_close (p->input_cd); |
| 642 | p->input_cd = (iconv_t) -1; |
| 643 | } |
| 644 | |
| 645 | if (p->output_cd != (iconv_t) -1) |
| 646 | { |
| 647 | iconv_close (p->output_cd); |
| 648 | p->output_cd = (iconv_t) -1; |
| 649 | } |
| 650 | } |
| 651 | #undef FUNC_NAME |
| 652 | |
| 653 | |
| 654 | \f |
| 655 | |
| 656 | /* Predicates. */ |
| 657 | |
| 658 | SCM_DEFINE (scm_port_p, "port?", 1, 0, 0, |
| 659 | (SCM x), |
| 660 | "Return a boolean indicating whether @var{x} is a port.\n" |
| 661 | "Equivalent to @code{(or (input-port? @var{x}) (output-port?\n" |
| 662 | "@var{x}))}.") |
| 663 | #define FUNC_NAME s_scm_port_p |
| 664 | { |
| 665 | return scm_from_bool (SCM_PORTP (x)); |
| 666 | } |
| 667 | #undef FUNC_NAME |
| 668 | |
| 669 | SCM_DEFINE (scm_input_port_p, "input-port?", 1, 0, 0, |
| 670 | (SCM x), |
| 671 | "Return @code{#t} if @var{x} is an input port, otherwise return\n" |
| 672 | "@code{#f}. Any object satisfying this predicate also satisfies\n" |
| 673 | "@code{port?}.") |
| 674 | #define FUNC_NAME s_scm_input_port_p |
| 675 | { |
| 676 | return scm_from_bool (SCM_INPUT_PORT_P (x)); |
| 677 | } |
| 678 | #undef FUNC_NAME |
| 679 | |
| 680 | SCM_DEFINE (scm_output_port_p, "output-port?", 1, 0, 0, |
| 681 | (SCM x), |
| 682 | "Return @code{#t} if @var{x} is an output port, otherwise return\n" |
| 683 | "@code{#f}. Any object satisfying this predicate also satisfies\n" |
| 684 | "@code{port?}.") |
| 685 | #define FUNC_NAME s_scm_output_port_p |
| 686 | { |
| 687 | x = SCM_COERCE_OUTPORT (x); |
| 688 | return scm_from_bool (SCM_OUTPUT_PORT_P (x)); |
| 689 | } |
| 690 | #undef FUNC_NAME |
| 691 | |
| 692 | SCM_DEFINE (scm_port_closed_p, "port-closed?", 1, 0, 0, |
| 693 | (SCM port), |
| 694 | "Return @code{#t} if @var{port} is closed or @code{#f} if it is\n" |
| 695 | "open.") |
| 696 | #define FUNC_NAME s_scm_port_closed_p |
| 697 | { |
| 698 | SCM_VALIDATE_PORT (1, port); |
| 699 | return scm_from_bool (!SCM_OPPORTP (port)); |
| 700 | } |
| 701 | #undef FUNC_NAME |
| 702 | |
| 703 | SCM_DEFINE (scm_eof_object_p, "eof-object?", 1, 0, 0, |
| 704 | (SCM x), |
| 705 | "Return @code{#t} if @var{x} is an end-of-file object; otherwise\n" |
| 706 | "return @code{#f}.") |
| 707 | #define FUNC_NAME s_scm_eof_object_p |
| 708 | { |
| 709 | return scm_from_bool (SCM_EOF_OBJECT_P (x)); |
| 710 | } |
| 711 | #undef FUNC_NAME |
| 712 | |
| 713 | |
| 714 | \f |
| 715 | |
| 716 | /* Closing ports. */ |
| 717 | |
| 718 | /* scm_close_port |
| 719 | * Call the close operation on a port object. |
| 720 | * see also scm_close. |
| 721 | */ |
| 722 | SCM_DEFINE (scm_close_port, "close-port", 1, 0, 0, |
| 723 | (SCM port), |
| 724 | "Close the specified port object. Return @code{#t} if it\n" |
| 725 | "successfully closes a port or @code{#f} if it was already\n" |
| 726 | "closed. An exception may be raised if an error occurs, for\n" |
| 727 | "example when flushing buffered output. See also @ref{Ports and\n" |
| 728 | "File Descriptors, close}, for a procedure which can close file\n" |
| 729 | "descriptors.") |
| 730 | #define FUNC_NAME s_scm_close_port |
| 731 | { |
| 732 | int rv; |
| 733 | |
| 734 | port = SCM_COERCE_OUTPORT (port); |
| 735 | |
| 736 | SCM_VALIDATE_PORT (1, port); |
| 737 | if (SCM_CLOSEDP (port)) |
| 738 | return SCM_BOOL_F; |
| 739 | if (SCM_PORT_DESCRIPTOR (port)->close) |
| 740 | rv = SCM_PORT_DESCRIPTOR (port)->close (port); |
| 741 | else |
| 742 | rv = 0; |
| 743 | scm_i_remove_port (port); |
| 744 | SCM_CLR_PORT_OPEN_FLAG (port); |
| 745 | return scm_from_bool (rv >= 0); |
| 746 | } |
| 747 | #undef FUNC_NAME |
| 748 | |
| 749 | SCM_DEFINE (scm_close_input_port, "close-input-port", 1, 0, 0, |
| 750 | (SCM port), |
| 751 | "Close the specified input port object. The routine has no effect if\n" |
| 752 | "the file has already been closed. An exception may be raised if an\n" |
| 753 | "error occurs. The value returned is unspecified.\n\n" |
| 754 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" |
| 755 | "which can close file descriptors.") |
| 756 | #define FUNC_NAME s_scm_close_input_port |
| 757 | { |
| 758 | SCM_VALIDATE_INPUT_PORT (1, port); |
| 759 | scm_close_port (port); |
| 760 | return SCM_UNSPECIFIED; |
| 761 | } |
| 762 | #undef FUNC_NAME |
| 763 | |
| 764 | SCM_DEFINE (scm_close_output_port, "close-output-port", 1, 0, 0, |
| 765 | (SCM port), |
| 766 | "Close the specified output port object. The routine has no effect if\n" |
| 767 | "the file has already been closed. An exception may be raised if an\n" |
| 768 | "error occurs. The value returned is unspecified.\n\n" |
| 769 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" |
| 770 | "which can close file descriptors.") |
| 771 | #define FUNC_NAME s_scm_close_output_port |
| 772 | { |
| 773 | port = SCM_COERCE_OUTPORT (port); |
| 774 | SCM_VALIDATE_OUTPUT_PORT (1, port); |
| 775 | scm_close_port (port); |
| 776 | return SCM_UNSPECIFIED; |
| 777 | } |
| 778 | #undef FUNC_NAME |
| 779 | |
| 780 | |
| 781 | \f |
| 782 | |
| 783 | /* Encoding characters to byte streams, and decoding byte streams to |
| 784 | characters. */ |
| 785 | |
| 786 | /* A fluid specifying the default encoding for newly created ports. If it is |
| 787 | a string, that is the encoding. If it is #f, it is in the "native" |
| 788 | (Latin-1) encoding. */ |
| 789 | SCM_VARIABLE (default_port_encoding_var, "%default-port-encoding"); |
| 790 | |
| 791 | static int scm_port_encoding_init = 0; |
| 792 | |
| 793 | /* Use ENCODING as the default encoding for future ports. */ |
| 794 | void |
| 795 | scm_i_set_default_port_encoding (const char *encoding) |
| 796 | { |
| 797 | if (!scm_port_encoding_init |
| 798 | || !scm_is_fluid (SCM_VARIABLE_REF (default_port_encoding_var))) |
| 799 | scm_misc_error (NULL, "tried to set port encoding fluid before it is initialized", |
| 800 | SCM_EOL); |
| 801 | |
| 802 | if (encoding == NULL |
| 803 | || !strcmp (encoding, "ASCII") |
| 804 | || !strcmp (encoding, "ANSI_X3.4-1968") |
| 805 | || !strcmp (encoding, "ISO-8859-1")) |
| 806 | scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var), SCM_BOOL_F); |
| 807 | else |
| 808 | scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var), |
| 809 | scm_from_locale_string (encoding)); |
| 810 | } |
| 811 | |
| 812 | /* Return the name of the default encoding for newly created ports; a |
| 813 | return value of NULL means "ISO-8859-1". */ |
| 814 | const char * |
| 815 | scm_i_default_port_encoding (void) |
| 816 | { |
| 817 | if (!scm_port_encoding_init) |
| 818 | return NULL; |
| 819 | else if (!scm_is_fluid (SCM_VARIABLE_REF (default_port_encoding_var))) |
| 820 | return NULL; |
| 821 | else |
| 822 | { |
| 823 | SCM encoding; |
| 824 | |
| 825 | encoding = scm_fluid_ref (SCM_VARIABLE_REF (default_port_encoding_var)); |
| 826 | if (!scm_is_string (encoding)) |
| 827 | return NULL; |
| 828 | else |
| 829 | return scm_i_string_chars (encoding); |
| 830 | } |
| 831 | } |
| 832 | |
| 833 | void |
| 834 | scm_i_set_port_encoding_x (SCM port, const char *encoding) |
| 835 | { |
| 836 | scm_t_port *pt; |
| 837 | iconv_t new_input_cd, new_output_cd; |
| 838 | |
| 839 | new_input_cd = (iconv_t) -1; |
| 840 | new_output_cd = (iconv_t) -1; |
| 841 | |
| 842 | /* Set the character encoding for this port. */ |
| 843 | pt = SCM_PTAB_ENTRY (port); |
| 844 | |
| 845 | if (encoding == NULL) |
| 846 | encoding = "ISO-8859-1"; |
| 847 | |
| 848 | if (pt->encoding != encoding) |
| 849 | pt->encoding = scm_gc_strdup (encoding, "port"); |
| 850 | |
| 851 | /* If ENCODING is UTF-8, then no conversion descriptor is opened |
| 852 | because we do I/O ourselves. This saves 100+ KiB for each |
| 853 | descriptor. */ |
| 854 | if (strcmp (encoding, "UTF-8")) |
| 855 | { |
| 856 | if (SCM_CELL_WORD_0 (port) & SCM_RDNG) |
| 857 | { |
| 858 | /* Open an input iconv conversion descriptor, from ENCODING |
| 859 | to UTF-8. We choose UTF-8, not UTF-32, because iconv |
| 860 | implementations can typically convert from anything to |
| 861 | UTF-8, but not to UTF-32 (see |
| 862 | <http://lists.gnu.org/archive/html/bug-libunistring/2010-09/msg00007.html>). */ |
| 863 | new_input_cd = iconv_open ("UTF-8", encoding); |
| 864 | if (new_input_cd == (iconv_t) -1) |
| 865 | goto invalid_encoding; |
| 866 | } |
| 867 | |
| 868 | if (SCM_CELL_WORD_0 (port) & SCM_WRTNG) |
| 869 | { |
| 870 | new_output_cd = iconv_open (encoding, "UTF-8"); |
| 871 | if (new_output_cd == (iconv_t) -1) |
| 872 | { |
| 873 | if (new_input_cd != (iconv_t) -1) |
| 874 | iconv_close (new_input_cd); |
| 875 | goto invalid_encoding; |
| 876 | } |
| 877 | } |
| 878 | } |
| 879 | |
| 880 | if (pt->input_cd != (iconv_t) -1) |
| 881 | iconv_close (pt->input_cd); |
| 882 | if (pt->output_cd != (iconv_t) -1) |
| 883 | iconv_close (pt->output_cd); |
| 884 | |
| 885 | pt->input_cd = new_input_cd; |
| 886 | pt->output_cd = new_output_cd; |
| 887 | |
| 888 | return; |
| 889 | |
| 890 | invalid_encoding: |
| 891 | { |
| 892 | SCM err; |
| 893 | err = scm_from_locale_string (encoding); |
| 894 | scm_misc_error ("scm_i_set_port_encoding_x", |
| 895 | "invalid or unknown character encoding ~s", |
| 896 | scm_list_1 (err)); |
| 897 | } |
| 898 | } |
| 899 | |
| 900 | SCM_DEFINE (scm_port_encoding, "port-encoding", 1, 0, 0, |
| 901 | (SCM port), |
| 902 | "Returns, as a string, the character encoding that @var{port}\n" |
| 903 | "uses to interpret its input and output.\n") |
| 904 | #define FUNC_NAME s_scm_port_encoding |
| 905 | { |
| 906 | scm_t_port *pt; |
| 907 | const char *enc; |
| 908 | |
| 909 | SCM_VALIDATE_PORT (1, port); |
| 910 | |
| 911 | pt = SCM_PTAB_ENTRY (port); |
| 912 | enc = pt->encoding; |
| 913 | if (enc) |
| 914 | return scm_from_locale_string (pt->encoding); |
| 915 | else |
| 916 | return SCM_BOOL_F; |
| 917 | } |
| 918 | #undef FUNC_NAME |
| 919 | |
| 920 | SCM_DEFINE (scm_set_port_encoding_x, "set-port-encoding!", 2, 0, 0, |
| 921 | (SCM port, SCM enc), |
| 922 | "Sets the character encoding that will be used to interpret all\n" |
| 923 | "port I/O. New ports are created with the encoding\n" |
| 924 | "appropriate for the current locale if @code{setlocale} has \n" |
| 925 | "been called or ISO-8859-1 otherwise\n" |
| 926 | "and this procedure can be used to modify that encoding.\n") |
| 927 | #define FUNC_NAME s_scm_set_port_encoding_x |
| 928 | { |
| 929 | char *enc_str; |
| 930 | |
| 931 | SCM_VALIDATE_PORT (1, port); |
| 932 | SCM_VALIDATE_STRING (2, enc); |
| 933 | |
| 934 | enc_str = scm_to_locale_string (enc); |
| 935 | scm_i_set_port_encoding_x (port, enc_str); |
| 936 | free (enc_str); |
| 937 | |
| 938 | return SCM_UNSPECIFIED; |
| 939 | } |
| 940 | #undef FUNC_NAME |
| 941 | |
| 942 | |
| 943 | /* This determines how conversions handle unconvertible characters. */ |
| 944 | SCM_GLOBAL_VARIABLE (scm_conversion_strategy, "%port-conversion-strategy"); |
| 945 | static int scm_conversion_strategy_init = 0; |
| 946 | |
| 947 | scm_t_string_failed_conversion_handler |
| 948 | scm_i_get_conversion_strategy (SCM port) |
| 949 | { |
| 950 | SCM encoding; |
| 951 | |
| 952 | if (scm_is_false (port)) |
| 953 | { |
| 954 | if (!scm_conversion_strategy_init |
| 955 | || !scm_is_fluid (SCM_VARIABLE_REF (scm_conversion_strategy))) |
| 956 | return SCM_FAILED_CONVERSION_QUESTION_MARK; |
| 957 | else |
| 958 | { |
| 959 | encoding = scm_fluid_ref (SCM_VARIABLE_REF (scm_conversion_strategy)); |
| 960 | if (scm_is_false (encoding)) |
| 961 | return SCM_FAILED_CONVERSION_QUESTION_MARK; |
| 962 | else |
| 963 | return (scm_t_string_failed_conversion_handler) scm_to_int (encoding); |
| 964 | } |
| 965 | } |
| 966 | else |
| 967 | { |
| 968 | scm_t_port *pt; |
| 969 | pt = SCM_PTAB_ENTRY (port); |
| 970 | return pt->ilseq_handler; |
| 971 | } |
| 972 | |
| 973 | } |
| 974 | |
| 975 | void |
| 976 | scm_i_set_conversion_strategy_x (SCM port, |
| 977 | scm_t_string_failed_conversion_handler handler) |
| 978 | { |
| 979 | SCM strategy; |
| 980 | scm_t_port *pt; |
| 981 | |
| 982 | strategy = scm_from_int ((int) handler); |
| 983 | |
| 984 | if (scm_is_false (port)) |
| 985 | { |
| 986 | /* Set the default encoding for future ports. */ |
| 987 | if (!scm_conversion_strategy_init |
| 988 | || !scm_is_fluid (SCM_VARIABLE_REF (scm_conversion_strategy))) |
| 989 | scm_misc_error (NULL, "tried to set conversion strategy fluid before it is initialized", |
| 990 | SCM_EOL); |
| 991 | scm_fluid_set_x (SCM_VARIABLE_REF (scm_conversion_strategy), strategy); |
| 992 | } |
| 993 | else |
| 994 | { |
| 995 | /* Set the character encoding for this port. */ |
| 996 | pt = SCM_PTAB_ENTRY (port); |
| 997 | pt->ilseq_handler = handler; |
| 998 | } |
| 999 | } |
| 1000 | |
| 1001 | SCM_DEFINE (scm_port_conversion_strategy, "port-conversion-strategy", |
| 1002 | 1, 0, 0, (SCM port), |
| 1003 | "Returns the behavior of the port when handling a character that\n" |
| 1004 | "is not representable in the port's current encoding.\n" |
| 1005 | "It returns the symbol @code{error} if unrepresentable characters\n" |
| 1006 | "should cause exceptions, @code{substitute} if the port should\n" |
| 1007 | "try to replace unrepresentable characters with question marks or\n" |
| 1008 | "approximate characters, or @code{escape} if unrepresentable\n" |
| 1009 | "characters should be converted to string escapes.\n" |
| 1010 | "\n" |
| 1011 | "If @var{port} is @code{#f}, then the current default behavior\n" |
| 1012 | "will be returned. New ports will have this default behavior\n" |
| 1013 | "when they are created.\n") |
| 1014 | #define FUNC_NAME s_scm_port_conversion_strategy |
| 1015 | { |
| 1016 | scm_t_string_failed_conversion_handler h; |
| 1017 | |
| 1018 | SCM_VALIDATE_OPPORT (1, port); |
| 1019 | |
| 1020 | if (!scm_is_false (port)) |
| 1021 | { |
| 1022 | SCM_VALIDATE_OPPORT (1, port); |
| 1023 | } |
| 1024 | |
| 1025 | h = scm_i_get_conversion_strategy (port); |
| 1026 | if (h == SCM_FAILED_CONVERSION_ERROR) |
| 1027 | return scm_from_latin1_symbol ("error"); |
| 1028 | else if (h == SCM_FAILED_CONVERSION_QUESTION_MARK) |
| 1029 | return scm_from_latin1_symbol ("substitute"); |
| 1030 | else if (h == SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE) |
| 1031 | return scm_from_latin1_symbol ("escape"); |
| 1032 | else |
| 1033 | abort (); |
| 1034 | |
| 1035 | /* Never gets here. */ |
| 1036 | return SCM_UNDEFINED; |
| 1037 | } |
| 1038 | #undef FUNC_NAME |
| 1039 | |
| 1040 | SCM_DEFINE (scm_set_port_conversion_strategy_x, "set-port-conversion-strategy!", |
| 1041 | 2, 0, 0, |
| 1042 | (SCM port, SCM sym), |
| 1043 | "Sets the behavior of the interpreter when outputting a character\n" |
| 1044 | "that is not representable in the port's current encoding.\n" |
| 1045 | "@var{sym} can be either @code{'error}, @code{'substitute}, or\n" |
| 1046 | "@code{'escape}. If it is @code{'error}, an error will be thrown\n" |
| 1047 | "when an unconvertible character is encountered. If it is\n" |
| 1048 | "@code{'substitute}, then unconvertible characters will \n" |
| 1049 | "be replaced with approximate characters, or with question marks\n" |
| 1050 | "if no approximately correct character is available.\n" |
| 1051 | "If it is @code{'escape},\n" |
| 1052 | "it will appear as a hex escape when output.\n" |
| 1053 | "\n" |
| 1054 | "If @var{port} is an open port, the conversion error behavior\n" |
| 1055 | "is set for that port. If it is @code{#f}, it is set as the\n" |
| 1056 | "default behavior for any future ports that get created in\n" |
| 1057 | "this thread.\n") |
| 1058 | #define FUNC_NAME s_scm_set_port_conversion_strategy_x |
| 1059 | { |
| 1060 | SCM err; |
| 1061 | SCM qm; |
| 1062 | SCM esc; |
| 1063 | |
| 1064 | if (!scm_is_false (port)) |
| 1065 | { |
| 1066 | SCM_VALIDATE_OPPORT (1, port); |
| 1067 | } |
| 1068 | |
| 1069 | err = scm_from_latin1_symbol ("error"); |
| 1070 | if (scm_is_true (scm_eqv_p (sym, err))) |
| 1071 | { |
| 1072 | scm_i_set_conversion_strategy_x (port, SCM_FAILED_CONVERSION_ERROR); |
| 1073 | return SCM_UNSPECIFIED; |
| 1074 | } |
| 1075 | |
| 1076 | qm = scm_from_latin1_symbol ("substitute"); |
| 1077 | if (scm_is_true (scm_eqv_p (sym, qm))) |
| 1078 | { |
| 1079 | scm_i_set_conversion_strategy_x (port, |
| 1080 | SCM_FAILED_CONVERSION_QUESTION_MARK); |
| 1081 | return SCM_UNSPECIFIED; |
| 1082 | } |
| 1083 | |
| 1084 | esc = scm_from_latin1_symbol ("escape"); |
| 1085 | if (scm_is_true (scm_eqv_p (sym, esc))) |
| 1086 | { |
| 1087 | scm_i_set_conversion_strategy_x (port, |
| 1088 | SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE); |
| 1089 | return SCM_UNSPECIFIED; |
| 1090 | } |
| 1091 | |
| 1092 | SCM_MISC_ERROR ("unknown conversion behavior ~s", scm_list_1 (sym)); |
| 1093 | |
| 1094 | return SCM_UNSPECIFIED; |
| 1095 | } |
| 1096 | #undef FUNC_NAME |
| 1097 | |
| 1098 | |
| 1099 | \f |
| 1100 | |
| 1101 | /* Revealed counts --- an oddity inherited from SCSH. */ |
| 1102 | |
| 1103 | /* Find a port in the table and return its revealed count. |
| 1104 | Also used by the garbage collector. |
| 1105 | */ |
| 1106 | int |
| 1107 | scm_revealed_count (SCM port) |
| 1108 | { |
| 1109 | int ret; |
| 1110 | |
| 1111 | scm_c_lock_port (port); |
| 1112 | ret = SCM_REVEALED (port); |
| 1113 | scm_c_unlock_port (port); |
| 1114 | |
| 1115 | return ret; |
| 1116 | } |
| 1117 | |
| 1118 | SCM_DEFINE (scm_port_revealed, "port-revealed", 1, 0, 0, |
| 1119 | (SCM port), |
| 1120 | "Return the revealed count for @var{port}.") |
| 1121 | #define FUNC_NAME s_scm_port_revealed |
| 1122 | { |
| 1123 | port = SCM_COERCE_OUTPORT (port); |
| 1124 | SCM_VALIDATE_OPENPORT (1, port); |
| 1125 | return scm_from_int (scm_revealed_count (port)); |
| 1126 | } |
| 1127 | #undef FUNC_NAME |
| 1128 | |
| 1129 | /* Set the revealed count for a port. */ |
| 1130 | SCM_DEFINE (scm_set_port_revealed_x, "set-port-revealed!", 2, 0, 0, |
| 1131 | (SCM port, SCM rcount), |
| 1132 | "Sets the revealed count for a port to a given value.\n" |
| 1133 | "The return value is unspecified.") |
| 1134 | #define FUNC_NAME s_scm_set_port_revealed_x |
| 1135 | { |
| 1136 | int r; |
| 1137 | port = SCM_COERCE_OUTPORT (port); |
| 1138 | SCM_VALIDATE_OPENPORT (1, port); |
| 1139 | r = scm_to_int (rcount); |
| 1140 | scm_c_lock_port (port); |
| 1141 | SCM_REVEALED (port) = r; |
| 1142 | scm_c_unlock_port (port); |
| 1143 | return SCM_UNSPECIFIED; |
| 1144 | } |
| 1145 | #undef FUNC_NAME |
| 1146 | |
| 1147 | /* Set the revealed count for a port. */ |
| 1148 | SCM_DEFINE (scm_adjust_port_revealed_x, "adjust-port-revealed!", 2, 0, 0, |
| 1149 | (SCM port, SCM addend), |
| 1150 | "Add @var{addend} to the revealed count of @var{port}.\n" |
| 1151 | "The return value is unspecified.") |
| 1152 | #define FUNC_NAME s_scm_set_port_revealed_x |
| 1153 | { |
| 1154 | int a; |
| 1155 | port = SCM_COERCE_OUTPORT (port); |
| 1156 | SCM_VALIDATE_OPENPORT (1, port); |
| 1157 | a = scm_to_int (addend); |
| 1158 | scm_c_lock_port (port); |
| 1159 | SCM_REVEALED (port) += a; |
| 1160 | scm_c_unlock_port (port); |
| 1161 | return SCM_UNSPECIFIED; |
| 1162 | } |
| 1163 | #undef FUNC_NAME |
| 1164 | |
| 1165 | |
| 1166 | \f |
| 1167 | |
| 1168 | /* Input. */ |
| 1169 | |
| 1170 | int |
| 1171 | scm_get_byte_or_eof (SCM port) |
| 1172 | { |
| 1173 | int ret; |
| 1174 | |
| 1175 | scm_c_lock_port (port); |
| 1176 | ret = scm_get_byte_or_eof_unlocked (port); |
| 1177 | scm_c_unlock_port (port); |
| 1178 | |
| 1179 | return ret; |
| 1180 | } |
| 1181 | |
| 1182 | int |
| 1183 | scm_peek_byte_or_eof (SCM port) |
| 1184 | { |
| 1185 | int ret; |
| 1186 | |
| 1187 | scm_c_lock_port (port); |
| 1188 | ret = scm_peek_byte_or_eof_unlocked (port); |
| 1189 | scm_c_unlock_port (port); |
| 1190 | |
| 1191 | return ret; |
| 1192 | } |
| 1193 | |
| 1194 | /* scm_c_read |
| 1195 | * |
| 1196 | * Used by an application to read arbitrary number of bytes from an |
| 1197 | * SCM port. Same semantics as libc read, except that scm_c_read only |
| 1198 | * returns less than SIZE bytes if at end-of-file. |
| 1199 | * |
| 1200 | * Warning: Doesn't update port line and column counts! */ |
| 1201 | |
| 1202 | /* This structure, and the following swap_buffer function, are used |
| 1203 | for temporarily swapping a port's own read buffer, and the buffer |
| 1204 | that the caller of scm_c_read provides. */ |
| 1205 | struct port_and_swap_buffer |
| 1206 | { |
| 1207 | scm_t_port *pt; |
| 1208 | unsigned char *buffer; |
| 1209 | size_t size; |
| 1210 | }; |
| 1211 | |
| 1212 | static void |
| 1213 | swap_buffer (void *data) |
| 1214 | { |
| 1215 | struct port_and_swap_buffer *psb = (struct port_and_swap_buffer *) data; |
| 1216 | unsigned char *old_buf = psb->pt->read_buf; |
| 1217 | size_t old_size = psb->pt->read_buf_size; |
| 1218 | |
| 1219 | /* Make the port use (buffer, size) from the struct. */ |
| 1220 | psb->pt->read_pos = psb->pt->read_buf = psb->pt->read_end = psb->buffer; |
| 1221 | psb->pt->read_buf_size = psb->size; |
| 1222 | |
| 1223 | /* Save the port's old (buffer, size) in the struct. */ |
| 1224 | psb->buffer = old_buf; |
| 1225 | psb->size = old_size; |
| 1226 | } |
| 1227 | |
| 1228 | size_t |
| 1229 | scm_c_read_unlocked (SCM port, void *buffer, size_t size) |
| 1230 | #define FUNC_NAME "scm_c_read" |
| 1231 | { |
| 1232 | scm_t_port *pt; |
| 1233 | size_t n_read = 0, n_available; |
| 1234 | struct port_and_swap_buffer psb; |
| 1235 | |
| 1236 | SCM_VALIDATE_OPINPORT (1, port); |
| 1237 | |
| 1238 | pt = SCM_PTAB_ENTRY (port); |
| 1239 | if (pt->rw_active == SCM_PORT_WRITE) |
| 1240 | SCM_PORT_DESCRIPTOR (port)->flush (port); |
| 1241 | |
| 1242 | if (pt->rw_random) |
| 1243 | pt->rw_active = SCM_PORT_READ; |
| 1244 | |
| 1245 | /* Take bytes first from the port's read buffer. */ |
| 1246 | if (pt->read_pos < pt->read_end) |
| 1247 | { |
| 1248 | n_available = min (size, pt->read_end - pt->read_pos); |
| 1249 | memcpy (buffer, pt->read_pos, n_available); |
| 1250 | buffer = (char *) buffer + n_available; |
| 1251 | pt->read_pos += n_available; |
| 1252 | n_read += n_available; |
| 1253 | size -= n_available; |
| 1254 | } |
| 1255 | |
| 1256 | /* Avoid the scm_dynwind_* costs if we now have enough data. */ |
| 1257 | if (size == 0) |
| 1258 | return n_read; |
| 1259 | |
| 1260 | /* Now we will call scm_fill_input repeatedly until we have read the |
| 1261 | requested number of bytes. (Note that a single scm_fill_input |
| 1262 | call does not guarantee to fill the whole of the port's read |
| 1263 | buffer.) */ |
| 1264 | if (pt->read_buf_size <= 1 && pt->encoding == NULL) |
| 1265 | { |
| 1266 | /* The port that we are reading from is unbuffered - i.e. does |
| 1267 | not have its own persistent buffer - but we have a buffer, |
| 1268 | provided by our caller, that is the right size for the data |
| 1269 | that is wanted. For the following scm_fill_input calls, |
| 1270 | therefore, we use the buffer in hand as the port's read |
| 1271 | buffer. |
| 1272 | |
| 1273 | We need to make sure that the port's normal (1 byte) buffer |
| 1274 | is reinstated in case one of the scm_fill_input () calls |
| 1275 | throws an exception; we use the scm_dynwind_* API to achieve |
| 1276 | that. |
| 1277 | |
| 1278 | A consequence of this optimization is that the fill_input |
| 1279 | functions can't unget characters. That'll push data to the |
| 1280 | pushback buffer instead of this psb buffer. */ |
| 1281 | #if SCM_DEBUG == 1 |
| 1282 | unsigned char *pback = pt->putback_buf; |
| 1283 | #endif |
| 1284 | psb.pt = pt; |
| 1285 | psb.buffer = buffer; |
| 1286 | psb.size = size; |
| 1287 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
| 1288 | scm_dynwind_rewind_handler (swap_buffer, &psb, SCM_F_WIND_EXPLICITLY); |
| 1289 | scm_dynwind_unwind_handler (swap_buffer, &psb, SCM_F_WIND_EXPLICITLY); |
| 1290 | |
| 1291 | /* Call scm_fill_input until we have all the bytes that we need, |
| 1292 | or we hit EOF. */ |
| 1293 | while (pt->read_buf_size && (scm_fill_input_unlocked (port) != EOF)) |
| 1294 | { |
| 1295 | pt->read_buf_size -= (pt->read_end - pt->read_pos); |
| 1296 | pt->read_pos = pt->read_buf = pt->read_end; |
| 1297 | } |
| 1298 | #if SCM_DEBUG == 1 |
| 1299 | if (pback != pt->putback_buf |
| 1300 | || pt->read_buf - (unsigned char *) buffer < 0) |
| 1301 | scm_misc_error (FUNC_NAME, |
| 1302 | "scm_c_read must not call a fill function that pushes " |
| 1303 | "back characters onto an unbuffered port", SCM_EOL); |
| 1304 | #endif |
| 1305 | n_read += pt->read_buf - (unsigned char *) buffer; |
| 1306 | |
| 1307 | /* Reinstate the port's normal buffer. */ |
| 1308 | scm_dynwind_end (); |
| 1309 | } |
| 1310 | else |
| 1311 | { |
| 1312 | /* The port has its own buffer. It is important that we use it, |
| 1313 | even if it happens to be smaller than our caller's buffer, so |
| 1314 | that a custom port implementation's entry points (in |
| 1315 | particular, fill_input) can rely on the buffer always being |
| 1316 | the same as they first set up. */ |
| 1317 | while (size && (scm_fill_input_unlocked (port) != EOF)) |
| 1318 | { |
| 1319 | n_available = min (size, pt->read_end - pt->read_pos); |
| 1320 | memcpy (buffer, pt->read_pos, n_available); |
| 1321 | buffer = (char *) buffer + n_available; |
| 1322 | pt->read_pos += n_available; |
| 1323 | n_read += n_available; |
| 1324 | size -= n_available; |
| 1325 | } |
| 1326 | } |
| 1327 | |
| 1328 | return n_read; |
| 1329 | } |
| 1330 | #undef FUNC_NAME |
| 1331 | |
| 1332 | size_t |
| 1333 | scm_c_read (SCM port, void *buffer, size_t size) |
| 1334 | { |
| 1335 | size_t ret; |
| 1336 | |
| 1337 | scm_c_lock_port (port); |
| 1338 | ret = scm_c_read_unlocked (port, buffer, size); |
| 1339 | scm_c_unlock_port (port); |
| 1340 | |
| 1341 | return ret; |
| 1342 | } |
| 1343 | |
| 1344 | /* Update the line and column number of PORT after consumption of C. */ |
| 1345 | static inline void |
| 1346 | update_port_lf (scm_t_wchar c, SCM port) |
| 1347 | { |
| 1348 | switch (c) |
| 1349 | { |
| 1350 | case '\a': |
| 1351 | case EOF: |
| 1352 | break; |
| 1353 | case '\b': |
| 1354 | SCM_DECCOL (port); |
| 1355 | break; |
| 1356 | case '\n': |
| 1357 | SCM_INCLINE (port); |
| 1358 | break; |
| 1359 | case '\r': |
| 1360 | SCM_ZEROCOL (port); |
| 1361 | break; |
| 1362 | case '\t': |
| 1363 | SCM_TABCOL (port); |
| 1364 | break; |
| 1365 | default: |
| 1366 | SCM_INCCOL (port); |
| 1367 | break; |
| 1368 | } |
| 1369 | } |
| 1370 | |
| 1371 | #define SCM_MBCHAR_BUF_SIZE (4) |
| 1372 | |
| 1373 | /* Convert the SIZE-byte UTF-8 sequence in UTF8_BUF to a codepoint. |
| 1374 | UTF8_BUF is assumed to contain a valid UTF-8 sequence. */ |
| 1375 | static scm_t_wchar |
| 1376 | utf8_to_codepoint (const scm_t_uint8 *utf8_buf, size_t size) |
| 1377 | { |
| 1378 | scm_t_wchar codepoint; |
| 1379 | |
| 1380 | if (utf8_buf[0] <= 0x7f) |
| 1381 | { |
| 1382 | assert (size == 1); |
| 1383 | codepoint = utf8_buf[0]; |
| 1384 | } |
| 1385 | else if ((utf8_buf[0] & 0xe0) == 0xc0) |
| 1386 | { |
| 1387 | assert (size == 2); |
| 1388 | codepoint = ((scm_t_wchar) utf8_buf[0] & 0x1f) << 6UL |
| 1389 | | (utf8_buf[1] & 0x3f); |
| 1390 | } |
| 1391 | else if ((utf8_buf[0] & 0xf0) == 0xe0) |
| 1392 | { |
| 1393 | assert (size == 3); |
| 1394 | codepoint = ((scm_t_wchar) utf8_buf[0] & 0x0f) << 12UL |
| 1395 | | ((scm_t_wchar) utf8_buf[1] & 0x3f) << 6UL |
| 1396 | | (utf8_buf[2] & 0x3f); |
| 1397 | } |
| 1398 | else |
| 1399 | { |
| 1400 | assert (size == 4); |
| 1401 | codepoint = ((scm_t_wchar) utf8_buf[0] & 0x07) << 18UL |
| 1402 | | ((scm_t_wchar) utf8_buf[1] & 0x3f) << 12UL |
| 1403 | | ((scm_t_wchar) utf8_buf[2] & 0x3f) << 6UL |
| 1404 | | (utf8_buf[3] & 0x3f); |
| 1405 | } |
| 1406 | |
| 1407 | return codepoint; |
| 1408 | } |
| 1409 | |
| 1410 | /* Read a UTF-8 sequence from PORT. On success, return 0 and set |
| 1411 | *CODEPOINT to the codepoint that was read, fill BUF with its UTF-8 |
| 1412 | representation, and set *LEN to the length in bytes. Return |
| 1413 | `EILSEQ' on error. */ |
| 1414 | static int |
| 1415 | get_utf8_codepoint (SCM port, scm_t_wchar *codepoint, |
| 1416 | scm_t_uint8 buf[SCM_MBCHAR_BUF_SIZE], size_t *len) |
| 1417 | { |
| 1418 | #define ASSERT_NOT_EOF(b) \ |
| 1419 | if (SCM_UNLIKELY ((b) == EOF)) \ |
| 1420 | goto invalid_seq |
| 1421 | #define CONSUME_PEEKED_BYTE() \ |
| 1422 | pt->read_pos++ |
| 1423 | |
| 1424 | int byte; |
| 1425 | scm_t_port *pt; |
| 1426 | |
| 1427 | *len = 0; |
| 1428 | pt = SCM_PTAB_ENTRY (port); |
| 1429 | |
| 1430 | byte = scm_get_byte_or_eof_unlocked (port); |
| 1431 | if (byte == EOF) |
| 1432 | { |
| 1433 | *codepoint = EOF; |
| 1434 | return 0; |
| 1435 | } |
| 1436 | |
| 1437 | buf[0] = (scm_t_uint8) byte; |
| 1438 | *len = 1; |
| 1439 | |
| 1440 | if (buf[0] <= 0x7f) |
| 1441 | /* 1-byte form. */ |
| 1442 | *codepoint = buf[0]; |
| 1443 | else if (buf[0] >= 0xc2 && buf[0] <= 0xdf) |
| 1444 | { |
| 1445 | /* 2-byte form. */ |
| 1446 | byte = scm_peek_byte_or_eof_unlocked (port); |
| 1447 | ASSERT_NOT_EOF (byte); |
| 1448 | |
| 1449 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80)) |
| 1450 | goto invalid_seq; |
| 1451 | |
| 1452 | CONSUME_PEEKED_BYTE (); |
| 1453 | buf[1] = (scm_t_uint8) byte; |
| 1454 | *len = 2; |
| 1455 | |
| 1456 | *codepoint = ((scm_t_wchar) buf[0] & 0x1f) << 6UL |
| 1457 | | (buf[1] & 0x3f); |
| 1458 | } |
| 1459 | else if ((buf[0] & 0xf0) == 0xe0) |
| 1460 | { |
| 1461 | /* 3-byte form. */ |
| 1462 | byte = scm_peek_byte_or_eof_unlocked (port); |
| 1463 | ASSERT_NOT_EOF (byte); |
| 1464 | |
| 1465 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80 |
| 1466 | || (buf[0] == 0xe0 && byte < 0xa0) |
| 1467 | || (buf[0] == 0xed && byte > 0x9f))) |
| 1468 | goto invalid_seq; |
| 1469 | |
| 1470 | CONSUME_PEEKED_BYTE (); |
| 1471 | buf[1] = (scm_t_uint8) byte; |
| 1472 | *len = 2; |
| 1473 | |
| 1474 | byte = scm_peek_byte_or_eof_unlocked (port); |
| 1475 | ASSERT_NOT_EOF (byte); |
| 1476 | |
| 1477 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80)) |
| 1478 | goto invalid_seq; |
| 1479 | |
| 1480 | CONSUME_PEEKED_BYTE (); |
| 1481 | buf[2] = (scm_t_uint8) byte; |
| 1482 | *len = 3; |
| 1483 | |
| 1484 | *codepoint = ((scm_t_wchar) buf[0] & 0x0f) << 12UL |
| 1485 | | ((scm_t_wchar) buf[1] & 0x3f) << 6UL |
| 1486 | | (buf[2] & 0x3f); |
| 1487 | } |
| 1488 | else if (buf[0] >= 0xf0 && buf[0] <= 0xf4) |
| 1489 | { |
| 1490 | /* 4-byte form. */ |
| 1491 | byte = scm_peek_byte_or_eof_unlocked (port); |
| 1492 | ASSERT_NOT_EOF (byte); |
| 1493 | |
| 1494 | if (SCM_UNLIKELY (((byte & 0xc0) != 0x80) |
| 1495 | || (buf[0] == 0xf0 && byte < 0x90) |
| 1496 | || (buf[0] == 0xf4 && byte > 0x8f))) |
| 1497 | goto invalid_seq; |
| 1498 | |
| 1499 | CONSUME_PEEKED_BYTE (); |
| 1500 | buf[1] = (scm_t_uint8) byte; |
| 1501 | *len = 2; |
| 1502 | |
| 1503 | byte = scm_peek_byte_or_eof_unlocked (port); |
| 1504 | ASSERT_NOT_EOF (byte); |
| 1505 | |
| 1506 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80)) |
| 1507 | goto invalid_seq; |
| 1508 | |
| 1509 | CONSUME_PEEKED_BYTE (); |
| 1510 | buf[2] = (scm_t_uint8) byte; |
| 1511 | *len = 3; |
| 1512 | |
| 1513 | byte = scm_peek_byte_or_eof_unlocked (port); |
| 1514 | ASSERT_NOT_EOF (byte); |
| 1515 | |
| 1516 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80)) |
| 1517 | goto invalid_seq; |
| 1518 | |
| 1519 | CONSUME_PEEKED_BYTE (); |
| 1520 | buf[3] = (scm_t_uint8) byte; |
| 1521 | *len = 4; |
| 1522 | |
| 1523 | *codepoint = ((scm_t_wchar) buf[0] & 0x07) << 18UL |
| 1524 | | ((scm_t_wchar) buf[1] & 0x3f) << 12UL |
| 1525 | | ((scm_t_wchar) buf[2] & 0x3f) << 6UL |
| 1526 | | (buf[3] & 0x3f); |
| 1527 | } |
| 1528 | else |
| 1529 | goto invalid_seq; |
| 1530 | |
| 1531 | return 0; |
| 1532 | |
| 1533 | invalid_seq: |
| 1534 | /* Here we could choose the consume the faulty byte when it's not a |
| 1535 | valid starting byte, but it's not a requirement. What Section 3.9 |
| 1536 | of Unicode 6.0.0 mandates, though, is to not consume a byte that |
| 1537 | would otherwise be a valid starting byte. */ |
| 1538 | |
| 1539 | return EILSEQ; |
| 1540 | |
| 1541 | #undef CONSUME_PEEKED_BYTE |
| 1542 | #undef ASSERT_NOT_EOF |
| 1543 | } |
| 1544 | |
| 1545 | /* Likewise, read a byte sequence from PORT, passing it through its |
| 1546 | input conversion descriptor. */ |
| 1547 | static int |
| 1548 | get_iconv_codepoint (SCM port, scm_t_wchar *codepoint, |
| 1549 | char buf[SCM_MBCHAR_BUF_SIZE], size_t *len) |
| 1550 | { |
| 1551 | scm_t_port *pt; |
| 1552 | int err, byte_read; |
| 1553 | size_t bytes_consumed, output_size; |
| 1554 | char *output; |
| 1555 | scm_t_uint8 utf8_buf[SCM_MBCHAR_BUF_SIZE]; |
| 1556 | |
| 1557 | pt = SCM_PTAB_ENTRY (port); |
| 1558 | |
| 1559 | for (output_size = 0, output = (char *) utf8_buf, |
| 1560 | bytes_consumed = 0, err = 0; |
| 1561 | err == 0 && output_size == 0 |
| 1562 | && (bytes_consumed == 0 || byte_read != EOF); |
| 1563 | bytes_consumed++) |
| 1564 | { |
| 1565 | char *input; |
| 1566 | size_t input_left, output_left, done; |
| 1567 | |
| 1568 | byte_read = scm_get_byte_or_eof_unlocked (port); |
| 1569 | if (byte_read == EOF) |
| 1570 | { |
| 1571 | if (bytes_consumed == 0) |
| 1572 | { |
| 1573 | *codepoint = (scm_t_wchar) EOF; |
| 1574 | *len = 0; |
| 1575 | return 0; |
| 1576 | } |
| 1577 | else |
| 1578 | continue; |
| 1579 | } |
| 1580 | |
| 1581 | buf[bytes_consumed] = byte_read; |
| 1582 | |
| 1583 | input = buf; |
| 1584 | input_left = bytes_consumed + 1; |
| 1585 | output_left = sizeof (utf8_buf); |
| 1586 | |
| 1587 | done = iconv (pt->input_cd, &input, &input_left, |
| 1588 | &output, &output_left); |
| 1589 | if (done == (size_t) -1) |
| 1590 | { |
| 1591 | err = errno; |
| 1592 | if (err == EINVAL) |
| 1593 | /* Missing input: keep trying. */ |
| 1594 | err = 0; |
| 1595 | } |
| 1596 | else |
| 1597 | output_size = sizeof (utf8_buf) - output_left; |
| 1598 | } |
| 1599 | |
| 1600 | if (SCM_UNLIKELY (output_size == 0)) |
| 1601 | /* An unterminated sequence. */ |
| 1602 | err = EILSEQ; |
| 1603 | else if (SCM_LIKELY (err == 0)) |
| 1604 | { |
| 1605 | /* Convert the UTF8_BUF sequence to a Unicode code point. */ |
| 1606 | *codepoint = utf8_to_codepoint (utf8_buf, output_size); |
| 1607 | *len = bytes_consumed; |
| 1608 | } |
| 1609 | |
| 1610 | return err; |
| 1611 | } |
| 1612 | |
| 1613 | /* Read a codepoint from PORT and return it in *CODEPOINT. Fill BUF |
| 1614 | with the byte representation of the codepoint in PORT's encoding, and |
| 1615 | set *LEN to the length in bytes of that representation. Return 0 on |
| 1616 | success and an errno value on error. */ |
| 1617 | static int |
| 1618 | get_codepoint (SCM port, scm_t_wchar *codepoint, |
| 1619 | char buf[SCM_MBCHAR_BUF_SIZE], size_t *len) |
| 1620 | { |
| 1621 | int err; |
| 1622 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 1623 | |
| 1624 | if (pt->input_cd == (iconv_t) -1) |
| 1625 | /* Initialize the conversion descriptors, if needed. */ |
| 1626 | scm_i_set_port_encoding_x (port, pt->encoding); |
| 1627 | |
| 1628 | /* FIXME: In 2.1, add a flag to determine whether a port is UTF-8. */ |
| 1629 | if (pt->input_cd == (iconv_t) -1) |
| 1630 | err = get_utf8_codepoint (port, codepoint, (scm_t_uint8 *) buf, len); |
| 1631 | else |
| 1632 | err = get_iconv_codepoint (port, codepoint, buf, len); |
| 1633 | |
| 1634 | if (SCM_LIKELY (err == 0)) |
| 1635 | update_port_lf (*codepoint, port); |
| 1636 | else if (pt->ilseq_handler == SCM_ICONVEH_QUESTION_MARK) |
| 1637 | { |
| 1638 | *codepoint = '?'; |
| 1639 | err = 0; |
| 1640 | update_port_lf (*codepoint, port); |
| 1641 | } |
| 1642 | |
| 1643 | return err; |
| 1644 | } |
| 1645 | |
| 1646 | /* Read a codepoint from PORT and return it. */ |
| 1647 | scm_t_wchar |
| 1648 | scm_getc_unlocked (SCM port) |
| 1649 | #define FUNC_NAME "scm_getc" |
| 1650 | { |
| 1651 | int err; |
| 1652 | size_t len; |
| 1653 | scm_t_wchar codepoint; |
| 1654 | char buf[SCM_MBCHAR_BUF_SIZE]; |
| 1655 | |
| 1656 | err = get_codepoint (port, &codepoint, buf, &len); |
| 1657 | if (SCM_UNLIKELY (err != 0)) |
| 1658 | /* At this point PORT should point past the invalid encoding, as per |
| 1659 | R6RS-lib Section 8.2.4. */ |
| 1660 | scm_decoding_error (FUNC_NAME, err, "input decoding error", port); |
| 1661 | |
| 1662 | return codepoint; |
| 1663 | } |
| 1664 | #undef FUNC_NAME |
| 1665 | |
| 1666 | scm_t_wchar |
| 1667 | scm_getc (SCM port) |
| 1668 | { |
| 1669 | scm_t_wchar ret; |
| 1670 | |
| 1671 | scm_c_lock_port (port); |
| 1672 | ret = scm_getc_unlocked (port); |
| 1673 | scm_c_unlock_port (port); |
| 1674 | |
| 1675 | return ret; |
| 1676 | } |
| 1677 | |
| 1678 | SCM_DEFINE (scm_read_char, "read-char", 0, 1, 0, |
| 1679 | (SCM port), |
| 1680 | "Return the next character available from @var{port}, updating\n" |
| 1681 | "@var{port} to point to the following character. If no more\n" |
| 1682 | "characters are available, the end-of-file object is returned.\n" |
| 1683 | "\n" |
| 1684 | "When @var{port}'s data cannot be decoded according to its\n" |
| 1685 | "character encoding, a @code{decoding-error} is raised and\n" |
| 1686 | "@var{port} points past the erroneous byte sequence.\n") |
| 1687 | #define FUNC_NAME s_scm_read_char |
| 1688 | { |
| 1689 | scm_t_wchar c; |
| 1690 | if (SCM_UNBNDP (port)) |
| 1691 | port = scm_current_input_port (); |
| 1692 | SCM_VALIDATE_OPINPORT (1, port); |
| 1693 | c = scm_getc_unlocked (port); |
| 1694 | if (EOF == c) |
| 1695 | return SCM_EOF_VAL; |
| 1696 | return SCM_MAKE_CHAR (c); |
| 1697 | } |
| 1698 | #undef FUNC_NAME |
| 1699 | |
| 1700 | |
| 1701 | \f |
| 1702 | |
| 1703 | /* Pushback. */ |
| 1704 | |
| 1705 | void |
| 1706 | scm_unget_byte_unlocked (int c, SCM port) |
| 1707 | #define FUNC_NAME "scm_unget_byte" |
| 1708 | { |
| 1709 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 1710 | |
| 1711 | if (pt->read_buf == pt->putback_buf) |
| 1712 | /* already using the put-back buffer. */ |
| 1713 | { |
| 1714 | /* enlarge putback_buf if necessary. */ |
| 1715 | if (pt->read_end == pt->read_buf + pt->read_buf_size |
| 1716 | && pt->read_buf == pt->read_pos) |
| 1717 | { |
| 1718 | size_t new_size = pt->read_buf_size * 2; |
| 1719 | unsigned char *tmp = (unsigned char *) |
| 1720 | scm_gc_realloc (pt->putback_buf, pt->read_buf_size, new_size, |
| 1721 | "putback buffer"); |
| 1722 | |
| 1723 | pt->read_pos = pt->read_buf = pt->putback_buf = tmp; |
| 1724 | pt->read_end = pt->read_buf + pt->read_buf_size; |
| 1725 | pt->read_buf_size = pt->putback_buf_size = new_size; |
| 1726 | } |
| 1727 | |
| 1728 | /* shift any existing bytes to buffer + 1. */ |
| 1729 | if (pt->read_pos == pt->read_end) |
| 1730 | pt->read_end = pt->read_buf + 1; |
| 1731 | else if (pt->read_pos != pt->read_buf + 1) |
| 1732 | { |
| 1733 | int count = pt->read_end - pt->read_pos; |
| 1734 | |
| 1735 | memmove (pt->read_buf + 1, pt->read_pos, count); |
| 1736 | pt->read_end = pt->read_buf + 1 + count; |
| 1737 | } |
| 1738 | |
| 1739 | pt->read_pos = pt->read_buf; |
| 1740 | } |
| 1741 | else |
| 1742 | /* switch to the put-back buffer. */ |
| 1743 | { |
| 1744 | if (pt->putback_buf == NULL) |
| 1745 | { |
| 1746 | pt->putback_buf |
| 1747 | = (unsigned char *) scm_gc_malloc_pointerless |
| 1748 | (SCM_INITIAL_PUTBACK_BUF_SIZE, "putback buffer"); |
| 1749 | pt->putback_buf_size = SCM_INITIAL_PUTBACK_BUF_SIZE; |
| 1750 | } |
| 1751 | |
| 1752 | pt->saved_read_buf = pt->read_buf; |
| 1753 | pt->saved_read_pos = pt->read_pos; |
| 1754 | pt->saved_read_end = pt->read_end; |
| 1755 | pt->saved_read_buf_size = pt->read_buf_size; |
| 1756 | |
| 1757 | pt->read_pos = pt->read_buf = pt->putback_buf; |
| 1758 | pt->read_end = pt->read_buf + 1; |
| 1759 | pt->read_buf_size = pt->putback_buf_size; |
| 1760 | } |
| 1761 | |
| 1762 | *pt->read_buf = c; |
| 1763 | |
| 1764 | if (pt->rw_random) |
| 1765 | pt->rw_active = SCM_PORT_READ; |
| 1766 | } |
| 1767 | #undef FUNC_NAME |
| 1768 | |
| 1769 | void |
| 1770 | scm_unget_byte (int c, SCM port) |
| 1771 | { |
| 1772 | scm_c_lock_port (port); |
| 1773 | scm_unget_byte_unlocked (c, port); |
| 1774 | scm_c_unlock_port (port); |
| 1775 | } |
| 1776 | |
| 1777 | void |
| 1778 | scm_ungetc_unlocked (scm_t_wchar c, SCM port) |
| 1779 | #define FUNC_NAME "scm_ungetc" |
| 1780 | { |
| 1781 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 1782 | char *result; |
| 1783 | char result_buf[10]; |
| 1784 | const char *encoding; |
| 1785 | size_t len; |
| 1786 | int i; |
| 1787 | |
| 1788 | if (pt->encoding != NULL) |
| 1789 | encoding = pt->encoding; |
| 1790 | else |
| 1791 | encoding = "ISO-8859-1"; |
| 1792 | |
| 1793 | len = sizeof (result_buf); |
| 1794 | result = u32_conv_to_encoding (encoding, |
| 1795 | (enum iconv_ilseq_handler) pt->ilseq_handler, |
| 1796 | (uint32_t *) &c, 1, NULL, |
| 1797 | result_buf, &len); |
| 1798 | |
| 1799 | if (SCM_UNLIKELY (result == NULL || len == 0)) |
| 1800 | scm_encoding_error (FUNC_NAME, errno, |
| 1801 | "conversion to port encoding failed", |
| 1802 | SCM_BOOL_F, SCM_MAKE_CHAR (c)); |
| 1803 | |
| 1804 | for (i = len - 1; i >= 0; i--) |
| 1805 | scm_unget_byte_unlocked (result[i], port); |
| 1806 | |
| 1807 | if (SCM_UNLIKELY (result != result_buf)) |
| 1808 | free (result); |
| 1809 | |
| 1810 | if (c == '\n') |
| 1811 | { |
| 1812 | /* What should col be in this case? |
| 1813 | * We'll leave it at -1. |
| 1814 | */ |
| 1815 | SCM_LINUM (port) -= 1; |
| 1816 | } |
| 1817 | else |
| 1818 | SCM_COL(port) -= 1; |
| 1819 | } |
| 1820 | #undef FUNC_NAME |
| 1821 | |
| 1822 | void |
| 1823 | scm_ungetc (scm_t_wchar c, SCM port) |
| 1824 | { |
| 1825 | scm_c_lock_port (port); |
| 1826 | scm_ungetc_unlocked (c, port); |
| 1827 | scm_c_unlock_port (port); |
| 1828 | } |
| 1829 | |
| 1830 | void |
| 1831 | scm_ungets_unlocked (const char *s, int n, SCM port) |
| 1832 | { |
| 1833 | /* This is simple minded and inefficient, but unreading strings is |
| 1834 | * probably not a common operation, and remember that line and |
| 1835 | * column numbers have to be handled... |
| 1836 | * |
| 1837 | * Please feel free to write an optimized version! |
| 1838 | */ |
| 1839 | while (n--) |
| 1840 | scm_ungetc_unlocked (s[n], port); |
| 1841 | } |
| 1842 | |
| 1843 | void |
| 1844 | scm_ungets (const char *s, int n, SCM port) |
| 1845 | { |
| 1846 | scm_c_lock_port (port); |
| 1847 | scm_ungets_unlocked (s, n, port); |
| 1848 | scm_c_unlock_port (port); |
| 1849 | } |
| 1850 | |
| 1851 | SCM_DEFINE (scm_peek_char, "peek-char", 0, 1, 0, |
| 1852 | (SCM port), |
| 1853 | "Return the next character available from @var{port},\n" |
| 1854 | "@emph{without} updating @var{port} to point to the following\n" |
| 1855 | "character. If no more characters are available, the\n" |
| 1856 | "end-of-file object is returned.\n" |
| 1857 | "\n" |
| 1858 | "The value returned by\n" |
| 1859 | "a call to @code{peek-char} is the same as the value that would\n" |
| 1860 | "have been returned by a call to @code{read-char} on the same\n" |
| 1861 | "port. The only difference is that the very next call to\n" |
| 1862 | "@code{read-char} or @code{peek-char} on that @var{port} will\n" |
| 1863 | "return the value returned by the preceding call to\n" |
| 1864 | "@code{peek-char}. In particular, a call to @code{peek-char} on\n" |
| 1865 | "an interactive port will hang waiting for input whenever a call\n" |
| 1866 | "to @code{read-char} would have hung.\n" |
| 1867 | "\n" |
| 1868 | "As for @code{read-char}, a @code{decoding-error} may be raised\n" |
| 1869 | "if such a situation occurs. However, unlike with @code{read-char},\n" |
| 1870 | "@var{port} still points at the beginning of the erroneous byte\n" |
| 1871 | "sequence when the error is raised.\n") |
| 1872 | #define FUNC_NAME s_scm_peek_char |
| 1873 | { |
| 1874 | int err; |
| 1875 | SCM result; |
| 1876 | scm_t_wchar c; |
| 1877 | char bytes[SCM_MBCHAR_BUF_SIZE]; |
| 1878 | long column, line, i; |
| 1879 | size_t len; |
| 1880 | |
| 1881 | if (SCM_UNBNDP (port)) |
| 1882 | port = scm_current_input_port (); |
| 1883 | SCM_VALIDATE_OPINPORT (1, port); |
| 1884 | |
| 1885 | column = SCM_COL (port); |
| 1886 | line = SCM_LINUM (port); |
| 1887 | |
| 1888 | err = get_codepoint (port, &c, bytes, &len); |
| 1889 | |
| 1890 | for (i = len - 1; i >= 0; i--) |
| 1891 | scm_unget_byte_unlocked (bytes[i], port); |
| 1892 | |
| 1893 | SCM_COL (port) = column; |
| 1894 | SCM_LINUM (port) = line; |
| 1895 | |
| 1896 | if (SCM_UNLIKELY (err != 0)) |
| 1897 | { |
| 1898 | scm_decoding_error (FUNC_NAME, err, "input decoding error", port); |
| 1899 | |
| 1900 | /* Shouldn't happen since `catch' always aborts to prompt. */ |
| 1901 | result = SCM_BOOL_F; |
| 1902 | } |
| 1903 | else if (c == EOF) |
| 1904 | result = SCM_EOF_VAL; |
| 1905 | else |
| 1906 | result = SCM_MAKE_CHAR (c); |
| 1907 | |
| 1908 | return result; |
| 1909 | } |
| 1910 | #undef FUNC_NAME |
| 1911 | |
| 1912 | SCM_DEFINE (scm_unread_char, "unread-char", 1, 1, 0, |
| 1913 | (SCM cobj, SCM port), |
| 1914 | "Place @var{char} in @var{port} so that it will be read by the\n" |
| 1915 | "next read operation. If called multiple times, the unread characters\n" |
| 1916 | "will be read again in last-in first-out order. If @var{port} is\n" |
| 1917 | "not supplied, the current input port is used.") |
| 1918 | #define FUNC_NAME s_scm_unread_char |
| 1919 | { |
| 1920 | int c; |
| 1921 | |
| 1922 | SCM_VALIDATE_CHAR (1, cobj); |
| 1923 | if (SCM_UNBNDP (port)) |
| 1924 | port = scm_current_input_port (); |
| 1925 | SCM_VALIDATE_OPINPORT (2, port); |
| 1926 | |
| 1927 | c = SCM_CHAR (cobj); |
| 1928 | |
| 1929 | scm_ungetc_unlocked (c, port); |
| 1930 | return cobj; |
| 1931 | } |
| 1932 | #undef FUNC_NAME |
| 1933 | |
| 1934 | SCM_DEFINE (scm_unread_string, "unread-string", 2, 0, 0, |
| 1935 | (SCM str, SCM port), |
| 1936 | "Place the string @var{str} in @var{port} so that its characters will be\n" |
| 1937 | "read in subsequent read operations. If called multiple times, the\n" |
| 1938 | "unread characters will be read again in last-in first-out order. If\n" |
| 1939 | "@var{port} is not supplied, the current-input-port is used.") |
| 1940 | #define FUNC_NAME s_scm_unread_string |
| 1941 | { |
| 1942 | int n; |
| 1943 | SCM_VALIDATE_STRING (1, str); |
| 1944 | if (SCM_UNBNDP (port)) |
| 1945 | port = scm_current_input_port (); |
| 1946 | SCM_VALIDATE_OPINPORT (2, port); |
| 1947 | |
| 1948 | n = scm_i_string_length (str); |
| 1949 | |
| 1950 | while (n--) |
| 1951 | scm_ungetc_unlocked (scm_i_string_ref (str, n), port); |
| 1952 | |
| 1953 | return str; |
| 1954 | } |
| 1955 | #undef FUNC_NAME |
| 1956 | |
| 1957 | |
| 1958 | \f |
| 1959 | |
| 1960 | /* Manipulating the buffers. */ |
| 1961 | |
| 1962 | /* This routine does not take any locks, as it is usually called as part |
| 1963 | of a port implementation. */ |
| 1964 | void |
| 1965 | scm_port_non_buffer (scm_t_port *pt) |
| 1966 | { |
| 1967 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; |
| 1968 | pt->write_buf = pt->write_pos = &pt->shortbuf; |
| 1969 | pt->read_buf_size = pt->write_buf_size = 1; |
| 1970 | pt->write_end = pt->write_buf + pt->write_buf_size; |
| 1971 | } |
| 1972 | |
| 1973 | /* this should only be called when the read buffer is empty. it |
| 1974 | tries to refill the read buffer. it returns the first char from |
| 1975 | the port, which is either EOF or *(pt->read_pos). */ |
| 1976 | int |
| 1977 | scm_fill_input_unlocked (SCM port) |
| 1978 | { |
| 1979 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 1980 | |
| 1981 | assert (pt->read_pos == pt->read_end); |
| 1982 | |
| 1983 | if (pt->read_buf == pt->putback_buf) |
| 1984 | { |
| 1985 | /* finished reading put-back chars. */ |
| 1986 | pt->read_buf = pt->saved_read_buf; |
| 1987 | pt->read_pos = pt->saved_read_pos; |
| 1988 | pt->read_end = pt->saved_read_end; |
| 1989 | pt->read_buf_size = pt->saved_read_buf_size; |
| 1990 | if (pt->read_pos < pt->read_end) |
| 1991 | return *(pt->read_pos); |
| 1992 | } |
| 1993 | return SCM_PORT_DESCRIPTOR (port)->fill_input (port); |
| 1994 | } |
| 1995 | |
| 1996 | int |
| 1997 | scm_fill_input (SCM port) |
| 1998 | { |
| 1999 | int ret; |
| 2000 | |
| 2001 | scm_c_lock_port (port); |
| 2002 | ret = scm_fill_input_unlocked (port); |
| 2003 | scm_c_unlock_port (port); |
| 2004 | |
| 2005 | return ret; |
| 2006 | } |
| 2007 | |
| 2008 | /* move up to read_len chars from port's putback and/or read buffers |
| 2009 | into memory starting at dest. returns the number of chars moved. */ |
| 2010 | size_t |
| 2011 | scm_take_from_input_buffers (SCM port, char *dest, size_t read_len) |
| 2012 | { |
| 2013 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 2014 | size_t chars_read = 0; |
| 2015 | size_t from_buf = min (pt->read_end - pt->read_pos, read_len); |
| 2016 | |
| 2017 | if (from_buf > 0) |
| 2018 | { |
| 2019 | memcpy (dest, pt->read_pos, from_buf); |
| 2020 | pt->read_pos += from_buf; |
| 2021 | chars_read += from_buf; |
| 2022 | read_len -= from_buf; |
| 2023 | dest += from_buf; |
| 2024 | } |
| 2025 | |
| 2026 | /* if putback was active, try the real input buffer too. */ |
| 2027 | if (pt->read_buf == pt->putback_buf) |
| 2028 | { |
| 2029 | from_buf = min (pt->saved_read_end - pt->saved_read_pos, read_len); |
| 2030 | if (from_buf > 0) |
| 2031 | { |
| 2032 | memcpy (dest, pt->saved_read_pos, from_buf); |
| 2033 | pt->saved_read_pos += from_buf; |
| 2034 | chars_read += from_buf; |
| 2035 | } |
| 2036 | } |
| 2037 | return chars_read; |
| 2038 | } |
| 2039 | |
| 2040 | /* Clear a port's read buffers, returning the contents. */ |
| 2041 | SCM_DEFINE (scm_drain_input, "drain-input", 1, 0, 0, |
| 2042 | (SCM port), |
| 2043 | "This procedure clears a port's input buffers, similar\n" |
| 2044 | "to the way that force-output clears the output buffer. The\n" |
| 2045 | "contents of the buffers are returned as a single string, e.g.,\n" |
| 2046 | "\n" |
| 2047 | "@lisp\n" |
| 2048 | "(define p (open-input-file ...))\n" |
| 2049 | "(drain-input p) => empty string, nothing buffered yet.\n" |
| 2050 | "(unread-char (read-char p) p)\n" |
| 2051 | "(drain-input p) => initial chars from p, up to the buffer size.\n" |
| 2052 | "@end lisp\n\n" |
| 2053 | "Draining the buffers may be useful for cleanly finishing\n" |
| 2054 | "buffered I/O so that the file descriptor can be used directly\n" |
| 2055 | "for further input.") |
| 2056 | #define FUNC_NAME s_scm_drain_input |
| 2057 | { |
| 2058 | SCM result; |
| 2059 | char *data; |
| 2060 | scm_t_port *pt; |
| 2061 | long count; |
| 2062 | |
| 2063 | SCM_VALIDATE_OPINPORT (1, port); |
| 2064 | pt = SCM_PTAB_ENTRY (port); |
| 2065 | |
| 2066 | count = pt->read_end - pt->read_pos; |
| 2067 | if (pt->read_buf == pt->putback_buf) |
| 2068 | count += pt->saved_read_end - pt->saved_read_pos; |
| 2069 | |
| 2070 | if (count) |
| 2071 | { |
| 2072 | result = scm_i_make_string (count, &data, 0); |
| 2073 | scm_take_from_input_buffers (port, data, count); |
| 2074 | } |
| 2075 | else |
| 2076 | result = scm_nullstr; |
| 2077 | |
| 2078 | return result; |
| 2079 | } |
| 2080 | #undef FUNC_NAME |
| 2081 | |
| 2082 | void |
| 2083 | scm_end_input_unlocked (SCM port) |
| 2084 | { |
| 2085 | long offset; |
| 2086 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 2087 | |
| 2088 | if (pt->read_buf == pt->putback_buf) |
| 2089 | { |
| 2090 | offset = pt->read_end - pt->read_pos; |
| 2091 | pt->read_buf = pt->saved_read_buf; |
| 2092 | pt->read_pos = pt->saved_read_pos; |
| 2093 | pt->read_end = pt->saved_read_end; |
| 2094 | pt->read_buf_size = pt->saved_read_buf_size; |
| 2095 | } |
| 2096 | else |
| 2097 | offset = 0; |
| 2098 | |
| 2099 | SCM_PORT_DESCRIPTOR (port)->end_input (port, offset); |
| 2100 | } |
| 2101 | |
| 2102 | void |
| 2103 | scm_end_input (SCM port) |
| 2104 | { |
| 2105 | scm_c_lock_port (port); |
| 2106 | scm_end_input_unlocked (port); |
| 2107 | scm_c_unlock_port (port); |
| 2108 | } |
| 2109 | |
| 2110 | SCM_DEFINE (scm_force_output, "force-output", 0, 1, 0, |
| 2111 | (SCM port), |
| 2112 | "Flush the specified output port, or the current output port if @var{port}\n" |
| 2113 | "is omitted. The current output buffer contents are passed to the\n" |
| 2114 | "underlying port implementation (e.g., in the case of fports, the\n" |
| 2115 | "data will be written to the file and the output buffer will be cleared.)\n" |
| 2116 | "It has no effect on an unbuffered port.\n\n" |
| 2117 | "The return value is unspecified.") |
| 2118 | #define FUNC_NAME s_scm_force_output |
| 2119 | { |
| 2120 | if (SCM_UNBNDP (port)) |
| 2121 | port = scm_current_output_port (); |
| 2122 | else |
| 2123 | { |
| 2124 | port = SCM_COERCE_OUTPORT (port); |
| 2125 | SCM_VALIDATE_OPOUTPORT (1, port); |
| 2126 | } |
| 2127 | scm_flush_unlocked (port); |
| 2128 | return SCM_UNSPECIFIED; |
| 2129 | } |
| 2130 | #undef FUNC_NAME |
| 2131 | |
| 2132 | void |
| 2133 | scm_flush_unlocked (SCM port) |
| 2134 | { |
| 2135 | SCM_PORT_DESCRIPTOR (port)->flush (port); |
| 2136 | } |
| 2137 | |
| 2138 | void |
| 2139 | scm_flush (SCM port) |
| 2140 | { |
| 2141 | scm_c_lock_port (port); |
| 2142 | scm_flush_unlocked (port); |
| 2143 | scm_c_unlock_port (port); |
| 2144 | } |
| 2145 | |
| 2146 | |
| 2147 | \f |
| 2148 | |
| 2149 | /* Output. */ |
| 2150 | |
| 2151 | /* scm_c_write |
| 2152 | * |
| 2153 | * Used by an application to write arbitrary number of bytes to an SCM |
| 2154 | * port. Similar semantics as libc write. However, unlike libc |
| 2155 | * write, scm_c_write writes the requested number of bytes and has no |
| 2156 | * return value. |
| 2157 | * |
| 2158 | * Warning: Doesn't update port line and column counts! |
| 2159 | */ |
| 2160 | void |
| 2161 | scm_c_write (SCM port, const void *ptr, size_t size) |
| 2162 | #define FUNC_NAME "scm_c_write" |
| 2163 | { |
| 2164 | scm_t_port *pt; |
| 2165 | scm_t_ptob_descriptor *ptob; |
| 2166 | |
| 2167 | SCM_VALIDATE_OPOUTPORT (1, port); |
| 2168 | |
| 2169 | pt = SCM_PTAB_ENTRY (port); |
| 2170 | ptob = SCM_PORT_DESCRIPTOR (port); |
| 2171 | |
| 2172 | if (pt->rw_active == SCM_PORT_READ) |
| 2173 | scm_end_input_unlocked (port); |
| 2174 | |
| 2175 | ptob->write (port, ptr, size); |
| 2176 | |
| 2177 | if (pt->rw_random) |
| 2178 | pt->rw_active = SCM_PORT_WRITE; |
| 2179 | } |
| 2180 | #undef FUNC_NAME |
| 2181 | |
| 2182 | /* scm_lfwrite |
| 2183 | * |
| 2184 | * This function differs from scm_c_write; it updates port line and |
| 2185 | * column. */ |
| 2186 | void |
| 2187 | scm_lfwrite (const char *ptr, size_t size, SCM port) |
| 2188 | { |
| 2189 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 2190 | scm_t_ptob_descriptor *ptob = SCM_PORT_DESCRIPTOR (port); |
| 2191 | |
| 2192 | if (pt->rw_active == SCM_PORT_READ) |
| 2193 | scm_end_input_unlocked (port); |
| 2194 | |
| 2195 | ptob->write (port, ptr, size); |
| 2196 | |
| 2197 | for (; size; ptr++, size--) |
| 2198 | update_port_lf ((scm_t_wchar) (unsigned char) *ptr, port); |
| 2199 | |
| 2200 | if (pt->rw_random) |
| 2201 | pt->rw_active = SCM_PORT_WRITE; |
| 2202 | } |
| 2203 | |
| 2204 | /* Write STR to PORT from START inclusive to END exclusive. */ |
| 2205 | void |
| 2206 | scm_lfwrite_substr (SCM str, size_t start, size_t end, SCM port) |
| 2207 | { |
| 2208 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 2209 | |
| 2210 | if (pt->rw_active == SCM_PORT_READ) |
| 2211 | scm_end_input_unlocked (port); |
| 2212 | |
| 2213 | if (end == (size_t) -1) |
| 2214 | end = scm_i_string_length (str); |
| 2215 | |
| 2216 | scm_display (scm_c_substring (str, start, end), port); |
| 2217 | |
| 2218 | if (pt->rw_random) |
| 2219 | pt->rw_active = SCM_PORT_WRITE; |
| 2220 | } |
| 2221 | |
| 2222 | |
| 2223 | \f |
| 2224 | |
| 2225 | /* Querying and setting positions, and character availability. */ |
| 2226 | |
| 2227 | SCM_DEFINE (scm_char_ready_p, "char-ready?", 0, 1, 0, |
| 2228 | (SCM port), |
| 2229 | "Return @code{#t} if a character is ready on input @var{port}\n" |
| 2230 | "and return @code{#f} otherwise. If @code{char-ready?} returns\n" |
| 2231 | "@code{#t} then the next @code{read-char} operation on\n" |
| 2232 | "@var{port} is guaranteed not to hang. If @var{port} is a file\n" |
| 2233 | "port at end of file then @code{char-ready?} returns @code{#t}.\n" |
| 2234 | "\n" |
| 2235 | "@code{char-ready?} exists to make it possible for a\n" |
| 2236 | "program to accept characters from interactive ports without\n" |
| 2237 | "getting stuck waiting for input. Any input editors associated\n" |
| 2238 | "with such ports must make sure that characters whose existence\n" |
| 2239 | "has been asserted by @code{char-ready?} cannot be rubbed out.\n" |
| 2240 | "If @code{char-ready?} were to return @code{#f} at end of file,\n" |
| 2241 | "a port at end of file would be indistinguishable from an\n" |
| 2242 | "interactive port that has no ready characters.") |
| 2243 | #define FUNC_NAME s_scm_char_ready_p |
| 2244 | { |
| 2245 | scm_t_port *pt; |
| 2246 | |
| 2247 | if (SCM_UNBNDP (port)) |
| 2248 | port = scm_current_input_port (); |
| 2249 | /* It's possible to close the current input port, so validate even in |
| 2250 | this case. */ |
| 2251 | SCM_VALIDATE_OPINPORT (1, port); |
| 2252 | |
| 2253 | pt = SCM_PTAB_ENTRY (port); |
| 2254 | |
| 2255 | /* if the current read buffer is filled, or the |
| 2256 | last pushed-back char has been read and the saved buffer is |
| 2257 | filled, result is true. */ |
| 2258 | if (pt->read_pos < pt->read_end |
| 2259 | || (pt->read_buf == pt->putback_buf |
| 2260 | && pt->saved_read_pos < pt->saved_read_end)) |
| 2261 | return SCM_BOOL_T; |
| 2262 | else |
| 2263 | { |
| 2264 | scm_t_ptob_descriptor *ptob = SCM_PORT_DESCRIPTOR (port); |
| 2265 | |
| 2266 | if (ptob->input_waiting) |
| 2267 | return scm_from_bool(ptob->input_waiting (port)); |
| 2268 | else |
| 2269 | return SCM_BOOL_T; |
| 2270 | } |
| 2271 | } |
| 2272 | #undef FUNC_NAME |
| 2273 | |
| 2274 | SCM_DEFINE (scm_seek, "seek", 3, 0, 0, |
| 2275 | (SCM fd_port, SCM offset, SCM whence), |
| 2276 | "Sets the current position of @var{fd/port} to the integer\n" |
| 2277 | "@var{offset}, which is interpreted according to the value of\n" |
| 2278 | "@var{whence}.\n" |
| 2279 | "\n" |
| 2280 | "One of the following variables should be supplied for\n" |
| 2281 | "@var{whence}:\n" |
| 2282 | "@defvar SEEK_SET\n" |
| 2283 | "Seek from the beginning of the file.\n" |
| 2284 | "@end defvar\n" |
| 2285 | "@defvar SEEK_CUR\n" |
| 2286 | "Seek from the current position.\n" |
| 2287 | "@end defvar\n" |
| 2288 | "@defvar SEEK_END\n" |
| 2289 | "Seek from the end of the file.\n" |
| 2290 | "@end defvar\n" |
| 2291 | "If @var{fd/port} is a file descriptor, the underlying system\n" |
| 2292 | "call is @code{lseek}. @var{port} may be a string port.\n" |
| 2293 | "\n" |
| 2294 | "The value returned is the new position in the file. This means\n" |
| 2295 | "that the current position of a port can be obtained using:\n" |
| 2296 | "@lisp\n" |
| 2297 | "(seek port 0 SEEK_CUR)\n" |
| 2298 | "@end lisp") |
| 2299 | #define FUNC_NAME s_scm_seek |
| 2300 | { |
| 2301 | int how; |
| 2302 | |
| 2303 | fd_port = SCM_COERCE_OUTPORT (fd_port); |
| 2304 | |
| 2305 | how = scm_to_int (whence); |
| 2306 | if (how != SEEK_SET && how != SEEK_CUR && how != SEEK_END) |
| 2307 | SCM_OUT_OF_RANGE (3, whence); |
| 2308 | |
| 2309 | if (SCM_OPPORTP (fd_port)) |
| 2310 | { |
| 2311 | scm_t_ptob_descriptor *ptob = SCM_PORT_DESCRIPTOR (fd_port); |
| 2312 | off_t_or_off64_t off = scm_to_off_t_or_off64_t (offset); |
| 2313 | off_t_or_off64_t rv; |
| 2314 | |
| 2315 | if (!ptob->seek) |
| 2316 | SCM_MISC_ERROR ("port is not seekable", |
| 2317 | scm_cons (fd_port, SCM_EOL)); |
| 2318 | else |
| 2319 | rv = ptob->seek (fd_port, off, how); |
| 2320 | return scm_from_off_t_or_off64_t (rv); |
| 2321 | } |
| 2322 | else /* file descriptor?. */ |
| 2323 | { |
| 2324 | off_t_or_off64_t off = scm_to_off_t_or_off64_t (offset); |
| 2325 | off_t_or_off64_t rv; |
| 2326 | rv = lseek_or_lseek64 (scm_to_int (fd_port), off, how); |
| 2327 | if (rv == -1) |
| 2328 | SCM_SYSERROR; |
| 2329 | return scm_from_off_t_or_off64_t (rv); |
| 2330 | } |
| 2331 | } |
| 2332 | #undef FUNC_NAME |
| 2333 | |
| 2334 | #ifndef O_BINARY |
| 2335 | #define O_BINARY 0 |
| 2336 | #endif |
| 2337 | |
| 2338 | /* Mingw has ftruncate(), perhaps implemented above using chsize, but |
| 2339 | doesn't have the filename version truncate(), hence this code. */ |
| 2340 | #if HAVE_FTRUNCATE && ! HAVE_TRUNCATE |
| 2341 | static int |
| 2342 | truncate (const char *file, off_t length) |
| 2343 | { |
| 2344 | int ret, fdes; |
| 2345 | |
| 2346 | fdes = open (file, O_BINARY | O_WRONLY); |
| 2347 | if (fdes == -1) |
| 2348 | return -1; |
| 2349 | |
| 2350 | ret = ftruncate (fdes, length); |
| 2351 | if (ret == -1) |
| 2352 | { |
| 2353 | int save_errno = errno; |
| 2354 | close (fdes); |
| 2355 | errno = save_errno; |
| 2356 | return -1; |
| 2357 | } |
| 2358 | |
| 2359 | return close (fdes); |
| 2360 | } |
| 2361 | #endif /* HAVE_FTRUNCATE && ! HAVE_TRUNCATE */ |
| 2362 | |
| 2363 | SCM_DEFINE (scm_truncate_file, "truncate-file", 1, 1, 0, |
| 2364 | (SCM object, SCM length), |
| 2365 | "Truncate @var{file} to @var{length} bytes. @var{file} can be a\n" |
| 2366 | "filename string, a port object, or an integer file descriptor.\n" |
| 2367 | "The return value is unspecified.\n" |
| 2368 | "\n" |
| 2369 | "For a port or file descriptor @var{length} can be omitted, in\n" |
| 2370 | "which case the file is truncated at the current position (per\n" |
| 2371 | "@code{ftell} above).\n" |
| 2372 | "\n" |
| 2373 | "On most systems a file can be extended by giving a length\n" |
| 2374 | "greater than the current size, but this is not mandatory in the\n" |
| 2375 | "POSIX standard.") |
| 2376 | #define FUNC_NAME s_scm_truncate_file |
| 2377 | { |
| 2378 | int rv; |
| 2379 | |
| 2380 | /* "object" can be a port, fdes or filename. |
| 2381 | |
| 2382 | Negative "length" makes no sense, but it's left to truncate() or |
| 2383 | ftruncate() to give back an error for that (normally EINVAL). |
| 2384 | */ |
| 2385 | |
| 2386 | if (SCM_UNBNDP (length)) |
| 2387 | { |
| 2388 | /* must supply length if object is a filename. */ |
| 2389 | if (scm_is_string (object)) |
| 2390 | SCM_MISC_ERROR("must supply length if OBJECT is a filename", SCM_EOL); |
| 2391 | |
| 2392 | length = scm_seek (object, SCM_INUM0, scm_from_int (SEEK_CUR)); |
| 2393 | } |
| 2394 | |
| 2395 | object = SCM_COERCE_OUTPORT (object); |
| 2396 | if (scm_is_integer (object)) |
| 2397 | { |
| 2398 | off_t_or_off64_t c_length = scm_to_off_t_or_off64_t (length); |
| 2399 | SCM_SYSCALL (rv = ftruncate_or_ftruncate64 (scm_to_int (object), |
| 2400 | c_length)); |
| 2401 | } |
| 2402 | else if (SCM_OPOUTPORTP (object)) |
| 2403 | { |
| 2404 | off_t_or_off64_t c_length = scm_to_off_t_or_off64_t (length); |
| 2405 | scm_t_port *pt = SCM_PTAB_ENTRY (object); |
| 2406 | scm_t_ptob_descriptor *ptob = SCM_PORT_DESCRIPTOR (object); |
| 2407 | |
| 2408 | if (!ptob->truncate) |
| 2409 | SCM_MISC_ERROR ("port is not truncatable", SCM_EOL); |
| 2410 | if (pt->rw_active == SCM_PORT_READ) |
| 2411 | scm_end_input_unlocked (object); |
| 2412 | else if (pt->rw_active == SCM_PORT_WRITE) |
| 2413 | ptob->flush (object); |
| 2414 | |
| 2415 | ptob->truncate (object, c_length); |
| 2416 | rv = 0; |
| 2417 | } |
| 2418 | else |
| 2419 | { |
| 2420 | off_t_or_off64_t c_length = scm_to_off_t_or_off64_t (length); |
| 2421 | char *str = scm_to_locale_string (object); |
| 2422 | int eno; |
| 2423 | SCM_SYSCALL (rv = truncate_or_truncate64 (str, c_length)); |
| 2424 | eno = errno; |
| 2425 | free (str); |
| 2426 | errno = eno; |
| 2427 | } |
| 2428 | if (rv == -1) |
| 2429 | SCM_SYSERROR; |
| 2430 | return SCM_UNSPECIFIED; |
| 2431 | } |
| 2432 | #undef FUNC_NAME |
| 2433 | |
| 2434 | SCM_DEFINE (scm_port_line, "port-line", 1, 0, 0, |
| 2435 | (SCM port), |
| 2436 | "Return the current line number for @var{port}.\n" |
| 2437 | "\n" |
| 2438 | "The first line of a file is 0. But you might want to add 1\n" |
| 2439 | "when printing line numbers, since starting from 1 is\n" |
| 2440 | "traditional in error messages, and likely to be more natural to\n" |
| 2441 | "non-programmers.") |
| 2442 | #define FUNC_NAME s_scm_port_line |
| 2443 | { |
| 2444 | port = SCM_COERCE_OUTPORT (port); |
| 2445 | SCM_VALIDATE_OPENPORT (1, port); |
| 2446 | return scm_from_long (SCM_LINUM (port)); |
| 2447 | } |
| 2448 | #undef FUNC_NAME |
| 2449 | |
| 2450 | SCM_DEFINE (scm_set_port_line_x, "set-port-line!", 2, 0, 0, |
| 2451 | (SCM port, SCM line), |
| 2452 | "Set the current line number for @var{port} to @var{line}. The\n" |
| 2453 | "first line of a file is 0.") |
| 2454 | #define FUNC_NAME s_scm_set_port_line_x |
| 2455 | { |
| 2456 | port = SCM_COERCE_OUTPORT (port); |
| 2457 | SCM_VALIDATE_OPENPORT (1, port); |
| 2458 | SCM_PTAB_ENTRY (port)->line_number = scm_to_long (line); |
| 2459 | return SCM_UNSPECIFIED; |
| 2460 | } |
| 2461 | #undef FUNC_NAME |
| 2462 | |
| 2463 | SCM_DEFINE (scm_port_column, "port-column", 1, 0, 0, |
| 2464 | (SCM port), |
| 2465 | "Return the current column number of @var{port}.\n" |
| 2466 | "If the number is\n" |
| 2467 | "unknown, the result is #f. Otherwise, the result is a 0-origin integer\n" |
| 2468 | "- i.e. the first character of the first line is line 0, column 0.\n" |
| 2469 | "(However, when you display a file position, for example in an error\n" |
| 2470 | "message, we recommend you add 1 to get 1-origin integers. This is\n" |
| 2471 | "because lines and column numbers traditionally start with 1, and that is\n" |
| 2472 | "what non-programmers will find most natural.)") |
| 2473 | #define FUNC_NAME s_scm_port_column |
| 2474 | { |
| 2475 | port = SCM_COERCE_OUTPORT (port); |
| 2476 | SCM_VALIDATE_OPENPORT (1, port); |
| 2477 | return scm_from_int (SCM_COL (port)); |
| 2478 | } |
| 2479 | #undef FUNC_NAME |
| 2480 | |
| 2481 | SCM_DEFINE (scm_set_port_column_x, "set-port-column!", 2, 0, 0, |
| 2482 | (SCM port, SCM column), |
| 2483 | "Set the current column of @var{port}. Before reading the first\n" |
| 2484 | "character on a line the column should be 0.") |
| 2485 | #define FUNC_NAME s_scm_set_port_column_x |
| 2486 | { |
| 2487 | port = SCM_COERCE_OUTPORT (port); |
| 2488 | SCM_VALIDATE_OPENPORT (1, port); |
| 2489 | SCM_PTAB_ENTRY (port)->column_number = scm_to_int (column); |
| 2490 | return SCM_UNSPECIFIED; |
| 2491 | } |
| 2492 | #undef FUNC_NAME |
| 2493 | |
| 2494 | SCM_DEFINE (scm_port_filename, "port-filename", 1, 0, 0, |
| 2495 | (SCM port), |
| 2496 | "Return the filename associated with @var{port}, or @code{#f}\n" |
| 2497 | "if no filename is associated with the port.") |
| 2498 | #define FUNC_NAME s_scm_port_filename |
| 2499 | { |
| 2500 | port = SCM_COERCE_OUTPORT (port); |
| 2501 | SCM_VALIDATE_OPENPORT (1, port); |
| 2502 | return SCM_FILENAME (port); |
| 2503 | } |
| 2504 | #undef FUNC_NAME |
| 2505 | |
| 2506 | SCM_DEFINE (scm_set_port_filename_x, "set-port-filename!", 2, 0, 0, |
| 2507 | (SCM port, SCM filename), |
| 2508 | "Change the filename associated with @var{port}, using the current input\n" |
| 2509 | "port if none is specified. Note that this does not change the port's\n" |
| 2510 | "source of data, but only the value that is returned by\n" |
| 2511 | "@code{port-filename} and reported in diagnostic output.") |
| 2512 | #define FUNC_NAME s_scm_set_port_filename_x |
| 2513 | { |
| 2514 | port = SCM_COERCE_OUTPORT (port); |
| 2515 | SCM_VALIDATE_OPENPORT (1, port); |
| 2516 | /* We allow the user to set the filename to whatever he likes. */ |
| 2517 | SCM_SET_FILENAME (port, filename); |
| 2518 | return SCM_UNSPECIFIED; |
| 2519 | } |
| 2520 | #undef FUNC_NAME |
| 2521 | |
| 2522 | |
| 2523 | \f |
| 2524 | |
| 2525 | /* Implementation helpers for port printing functions. */ |
| 2526 | |
| 2527 | void |
| 2528 | scm_print_port_mode (SCM exp, SCM port) |
| 2529 | { |
| 2530 | scm_puts (SCM_CLOSEDP (exp) |
| 2531 | ? "closed: " |
| 2532 | : (SCM_RDNG & SCM_CELL_WORD_0 (exp) |
| 2533 | ? (SCM_WRTNG & SCM_CELL_WORD_0 (exp) |
| 2534 | ? "input-output: " |
| 2535 | : "input: ") |
| 2536 | : (SCM_WRTNG & SCM_CELL_WORD_0 (exp) |
| 2537 | ? "output: " |
| 2538 | : "bogus: ")), |
| 2539 | port); |
| 2540 | } |
| 2541 | |
| 2542 | int |
| 2543 | scm_port_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) |
| 2544 | { |
| 2545 | char *type = SCM_PTOBNAME (SCM_PTOBNUM (exp)); |
| 2546 | if (!type) |
| 2547 | type = "port"; |
| 2548 | scm_puts ("#<", port); |
| 2549 | scm_print_port_mode (exp, port); |
| 2550 | scm_puts (type, port); |
| 2551 | scm_putc (' ', port); |
| 2552 | scm_uintprint (SCM_CELL_WORD_1 (exp), 16, port); |
| 2553 | scm_putc ('>', port); |
| 2554 | return 1; |
| 2555 | } |
| 2556 | |
| 2557 | |
| 2558 | \f |
| 2559 | |
| 2560 | /* Iterating over all ports. */ |
| 2561 | |
| 2562 | struct for_each_data |
| 2563 | { |
| 2564 | void (*proc) (void *data, SCM p); |
| 2565 | void *data; |
| 2566 | }; |
| 2567 | |
| 2568 | static SCM |
| 2569 | for_each_trampoline (void *data, SCM port, SCM result) |
| 2570 | { |
| 2571 | struct for_each_data *d = data; |
| 2572 | |
| 2573 | d->proc (d->data, port); |
| 2574 | |
| 2575 | return result; |
| 2576 | } |
| 2577 | |
| 2578 | void |
| 2579 | scm_c_port_for_each (void (*proc)(void *data, SCM p), void *data) |
| 2580 | { |
| 2581 | struct for_each_data d; |
| 2582 | |
| 2583 | d.proc = proc; |
| 2584 | d.data = data; |
| 2585 | |
| 2586 | scm_c_weak_set_fold (for_each_trampoline, &d, SCM_EOL, |
| 2587 | scm_i_port_weak_set); |
| 2588 | } |
| 2589 | |
| 2590 | static void |
| 2591 | scm_for_each_trampoline (void *data, SCM port) |
| 2592 | { |
| 2593 | scm_call_1 (SCM_PACK_POINTER (data), port); |
| 2594 | } |
| 2595 | |
| 2596 | SCM_DEFINE (scm_port_for_each, "port-for-each", 1, 0, 0, |
| 2597 | (SCM proc), |
| 2598 | "Apply @var{proc} to each port in the Guile port table\n" |
| 2599 | "in turn. The return value is unspecified. More specifically,\n" |
| 2600 | "@var{proc} is applied exactly once to every port that exists\n" |
| 2601 | "in the system at the time @var{port-for-each} is invoked.\n" |
| 2602 | "Changes to the port table while @var{port-for-each} is running\n" |
| 2603 | "have no effect as far as @var{port-for-each} is concerned.") |
| 2604 | #define FUNC_NAME s_scm_port_for_each |
| 2605 | { |
| 2606 | SCM_VALIDATE_PROC (1, proc); |
| 2607 | |
| 2608 | scm_c_port_for_each (scm_for_each_trampoline, SCM_UNPACK_POINTER (proc)); |
| 2609 | |
| 2610 | return SCM_UNSPECIFIED; |
| 2611 | } |
| 2612 | #undef FUNC_NAME |
| 2613 | |
| 2614 | static void |
| 2615 | flush_output_port (void *closure, SCM port) |
| 2616 | { |
| 2617 | if (SCM_OPOUTPORTP (port)) |
| 2618 | scm_flush_unlocked (port); |
| 2619 | } |
| 2620 | |
| 2621 | SCM_DEFINE (scm_flush_all_ports, "flush-all-ports", 0, 0, 0, |
| 2622 | (), |
| 2623 | "Equivalent to calling @code{force-output} on\n" |
| 2624 | "all open output ports. The return value is unspecified.") |
| 2625 | #define FUNC_NAME s_scm_flush_all_ports |
| 2626 | { |
| 2627 | scm_c_port_for_each (&flush_output_port, NULL); |
| 2628 | return SCM_UNSPECIFIED; |
| 2629 | } |
| 2630 | #undef FUNC_NAME |
| 2631 | |
| 2632 | |
| 2633 | \f |
| 2634 | |
| 2635 | /* Void ports. */ |
| 2636 | |
| 2637 | scm_t_bits scm_tc16_void_port = 0; |
| 2638 | |
| 2639 | static int fill_input_void_port (SCM port SCM_UNUSED) |
| 2640 | { |
| 2641 | return EOF; |
| 2642 | } |
| 2643 | |
| 2644 | static void |
| 2645 | write_void_port (SCM port SCM_UNUSED, |
| 2646 | const void *data SCM_UNUSED, |
| 2647 | size_t size SCM_UNUSED) |
| 2648 | { |
| 2649 | } |
| 2650 | |
| 2651 | static SCM |
| 2652 | scm_i_void_port (long mode_bits) |
| 2653 | { |
| 2654 | SCM ret; |
| 2655 | |
| 2656 | ret = scm_c_make_port (scm_tc16_void_port, mode_bits, 0); |
| 2657 | |
| 2658 | scm_port_non_buffer (SCM_PTAB_ENTRY (ret)); |
| 2659 | |
| 2660 | return ret; |
| 2661 | } |
| 2662 | |
| 2663 | SCM |
| 2664 | scm_void_port (char *mode_str) |
| 2665 | { |
| 2666 | return scm_i_void_port (scm_mode_bits (mode_str)); |
| 2667 | } |
| 2668 | |
| 2669 | SCM_DEFINE (scm_sys_make_void_port, "%make-void-port", 1, 0, 0, |
| 2670 | (SCM mode), |
| 2671 | "Create and return a new void port. A void port acts like\n" |
| 2672 | "@file{/dev/null}. The @var{mode} argument\n" |
| 2673 | "specifies the input/output modes for this port: see the\n" |
| 2674 | "documentation for @code{open-file} in @ref{File Ports}.") |
| 2675 | #define FUNC_NAME s_scm_sys_make_void_port |
| 2676 | { |
| 2677 | return scm_i_void_port (scm_i_mode_bits (mode)); |
| 2678 | } |
| 2679 | #undef FUNC_NAME |
| 2680 | |
| 2681 | |
| 2682 | \f |
| 2683 | |
| 2684 | /* Initialization. */ |
| 2685 | |
| 2686 | void |
| 2687 | scm_init_ports () |
| 2688 | { |
| 2689 | /* lseek() symbols. */ |
| 2690 | scm_c_define ("SEEK_SET", scm_from_int (SEEK_SET)); |
| 2691 | scm_c_define ("SEEK_CUR", scm_from_int (SEEK_CUR)); |
| 2692 | scm_c_define ("SEEK_END", scm_from_int (SEEK_END)); |
| 2693 | |
| 2694 | scm_tc16_void_port = scm_make_port_type ("void", fill_input_void_port, |
| 2695 | write_void_port); |
| 2696 | |
| 2697 | cur_inport_fluid = scm_make_fluid (); |
| 2698 | cur_outport_fluid = scm_make_fluid (); |
| 2699 | cur_errport_fluid = scm_make_fluid (); |
| 2700 | cur_loadport_fluid = scm_make_fluid (); |
| 2701 | |
| 2702 | scm_i_port_weak_set = scm_c_make_weak_set (31); |
| 2703 | |
| 2704 | #include "libguile/ports.x" |
| 2705 | |
| 2706 | /* Use Latin-1 as the default port encoding. */ |
| 2707 | SCM_VARIABLE_SET (default_port_encoding_var, scm_make_fluid ()); |
| 2708 | scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var), SCM_BOOL_F); |
| 2709 | scm_port_encoding_init = 1; |
| 2710 | |
| 2711 | SCM_VARIABLE_SET (scm_conversion_strategy, scm_make_fluid ()); |
| 2712 | scm_fluid_set_x (SCM_VARIABLE_REF (scm_conversion_strategy), |
| 2713 | scm_from_int ((int) SCM_FAILED_CONVERSION_QUESTION_MARK)); |
| 2714 | scm_conversion_strategy_init = 1; |
| 2715 | |
| 2716 | } |
| 2717 | |
| 2718 | /* |
| 2719 | Local Variables: |
| 2720 | c-file-style: "gnu" |
| 2721 | End: |
| 2722 | */ |