Commit | Line | Data |
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f4bc4e59 | 1 | /* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, |
b7e64f8b | 2 | * 2006, 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc. |
f4bc4e59 | 3 | * |
73be1d9e | 4 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
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. | |
0f2d19dd | 8 | * |
53befeb7 NJ |
9 | * This library is distributed in the hope that it will be useful, but |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | * Lesser General Public License for more details. | |
0f2d19dd | 13 | * |
73be1d9e MV |
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 | |
53befeb7 NJ |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
17 | * 02110-1301 USA | |
73be1d9e | 18 | */ |
1bbd0b84 | 19 | |
1bbd0b84 | 20 | |
0f2d19dd | 21 | \f |
d68fee48 JB |
22 | /* Headers. */ |
23 | ||
2b829bbb KR |
24 | #define _LARGEFILE64_SOURCE /* ask for stat64 etc */ |
25 | ||
dbb605f5 | 26 | #ifdef HAVE_CONFIG_H |
bd515f37 RB |
27 | # include <config.h> |
28 | #endif | |
29 | ||
0f2d19dd | 30 | #include <stdio.h> |
e6e2e95a | 31 | #include <errno.h> |
8ab3d8a0 | 32 | #include <fcntl.h> /* for chsize on mingw */ |
b5cb4464 | 33 | #include <assert.h> |
f4bc4e59 | 34 | #include <iconv.h> |
889975e5 MG |
35 | #include <uniconv.h> |
36 | #include <unistr.h> | |
37 | #include <striconveh.h> | |
e6e2e95a | 38 | |
fca43887 LC |
39 | #include <assert.h> |
40 | ||
a0599745 | 41 | #include "libguile/_scm.h" |
4e047c3e | 42 | #include "libguile/async.h" |
8269ba5b | 43 | #include "libguile/deprecation.h" |
f0942910 | 44 | #include "libguile/eval.h" |
8ab3d8a0 | 45 | #include "libguile/fports.h" /* direct access for seek and truncate */ |
9511876f | 46 | #include "libguile/goops.h" |
a0599745 MD |
47 | #include "libguile/smob.h" |
48 | #include "libguile/chars.h" | |
185e369a | 49 | #include "libguile/dynwind.h" |
0f2d19dd | 50 | |
a0599745 | 51 | #include "libguile/keywords.h" |
5dbc6c06 | 52 | #include "libguile/hashtab.h" |
a0599745 MD |
53 | #include "libguile/root.h" |
54 | #include "libguile/strings.h" | |
b42170a4 | 55 | #include "libguile/mallocs.h" |
a0599745 MD |
56 | #include "libguile/validate.h" |
57 | #include "libguile/ports.h" | |
3a5fb14d | 58 | #include "libguile/vectors.h" |
2721f918 | 59 | #include "libguile/weak-set.h" |
9de87eea | 60 | #include "libguile/fluids.h" |
889975e5 | 61 | #include "libguile/eq.h" |
0f2d19dd | 62 | |
bd9e24b3 GH |
63 | #ifdef HAVE_STRING_H |
64 | #include <string.h> | |
65 | #endif | |
66 | ||
ec65f5da MV |
67 | #ifdef HAVE_IO_H |
68 | #include <io.h> | |
69 | #endif | |
70 | ||
0f2d19dd JB |
71 | #ifdef HAVE_UNISTD_H |
72 | #include <unistd.h> | |
73 | #endif | |
74 | ||
95b88819 GH |
75 | #ifdef HAVE_SYS_IOCTL_H |
76 | #include <sys/ioctl.h> | |
77 | #endif | |
d68fee48 | 78 | |
8ab3d8a0 KR |
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 | ||
56a3dcd4 | 86 | #if defined HAVE_CHSIZE && ! defined HAVE_FTRUNCATE |
82893676 | 87 | #define ftruncate(fd, size) chsize (fd, size) |
8ab3d8a0 KR |
88 | #undef HAVE_FTRUNCATE |
89 | #define HAVE_FTRUNCATE 1 | |
82893676 MG |
90 | #endif |
91 | ||
0f2d19dd | 92 | \f |
d68fee48 | 93 | /* The port kind table --- a dynamically resized array of port types. */ |
0f2d19dd JB |
94 | |
95 | ||
96 | /* scm_ptobs scm_numptob | |
5dbc6c06 | 97 | * implement a dynamically resized array of ptob records. |
0f2d19dd JB |
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 | */ | |
62bd5d66 AW |
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; | |
6a97b1f9 | 106 | SCM_PTHREAD_ATFORK_LOCK_STATIC_MUTEX (scm_ptobs_lock); |
62bd5d66 AW |
107 | |
108 | long | |
109 | scm_c_num_port_types (void) | |
110 | { | |
111 | long ret; | |
112 | ||
113 | scm_i_pthread_mutex_lock (&scm_ptobs_lock); | |
114 | ret = scm_numptob; | |
115 | scm_i_pthread_mutex_unlock (&scm_ptobs_lock); | |
116 | ||
117 | return ret; | |
118 | } | |
119 | ||
120 | scm_t_ptob_descriptor* | |
121 | scm_c_port_type_ref (long ptobnum) | |
122 | { | |
123 | scm_t_ptob_descriptor *ret = NULL; | |
124 | ||
125 | scm_i_pthread_mutex_lock (&scm_ptobs_lock); | |
126 | ||
127 | if (0 <= ptobnum && ptobnum < scm_numptob) | |
128 | ret = scm_ptobs[ptobnum]; | |
129 | ||
130 | scm_i_pthread_mutex_unlock (&scm_ptobs_lock); | |
131 | ||
132 | if (!ret) | |
133 | scm_out_of_range ("scm_c_port_type_ref", scm_from_long (ptobnum)); | |
134 | ||
135 | return ret; | |
136 | } | |
137 | ||
138 | long | |
139 | scm_c_port_type_add_x (scm_t_ptob_descriptor *desc) | |
140 | { | |
141 | long ret = -1; | |
142 | ||
143 | scm_i_pthread_mutex_lock (&scm_ptobs_lock); | |
144 | ||
145 | if (scm_numptob + 1 < SCM_I_MAX_PORT_TYPE_COUNT) | |
146 | { | |
147 | if (scm_numptob == scm_ptobs_size) | |
148 | { | |
149 | unsigned long old_size = scm_ptobs_size; | |
150 | scm_t_ptob_descriptor **old_ptobs = scm_ptobs; | |
151 | ||
152 | /* Currently there are only 9 predefined port types, so one | |
153 | resize will cover it. */ | |
154 | scm_ptobs_size = old_size + 10; | |
155 | ||
156 | if (scm_ptobs_size >= SCM_I_MAX_PORT_TYPE_COUNT) | |
157 | scm_ptobs_size = SCM_I_MAX_PORT_TYPE_COUNT; | |
158 | ||
159 | scm_ptobs = scm_gc_malloc (sizeof (*scm_ptobs) * scm_ptobs_size, | |
160 | "scm_ptobs"); | |
161 | ||
162 | memcpy (scm_ptobs, old_ptobs, sizeof (*scm_ptobs) * scm_numptob); | |
163 | } | |
164 | ||
165 | ret = scm_numptob++; | |
166 | scm_ptobs[ret] = desc; | |
167 | } | |
168 | ||
169 | scm_i_pthread_mutex_unlock (&scm_ptobs_lock); | |
170 | ||
171 | if (ret < 0) | |
172 | scm_out_of_range ("scm_c_port_type_add_x", scm_from_long (scm_numptob)); | |
173 | ||
174 | return ret; | |
175 | } | |
0f2d19dd | 176 | |
f12733c9 | 177 | /* |
f12733c9 | 178 | * We choose to use an interface similar to the smob interface with |
affc96b5 | 179 | * fill_input and write as standard fields, passed to the port |
f12733c9 MD |
180 | * type constructor, and optional fields set by setters. |
181 | */ | |
182 | ||
70df8af6 | 183 | static void |
e81d98ec | 184 | flush_port_default (SCM port SCM_UNUSED) |
70df8af6 GH |
185 | { |
186 | } | |
187 | ||
188 | static void | |
e81d98ec | 189 | end_input_default (SCM port SCM_UNUSED, int offset SCM_UNUSED) |
70df8af6 GH |
190 | { |
191 | } | |
0f2d19dd | 192 | |
92c2555f | 193 | scm_t_bits |
f12733c9 | 194 | scm_make_port_type (char *name, |
affc96b5 | 195 | int (*fill_input) (SCM port), |
8aa011a1 | 196 | void (*write) (SCM port, const void *data, size_t size)) |
0f2d19dd | 197 | { |
62bd5d66 AW |
198 | scm_t_ptob_descriptor *desc; |
199 | long ptobnum; | |
affc96b5 | 200 | |
62bd5d66 AW |
201 | desc = scm_gc_malloc_pointerless (sizeof (*desc), "port-type"); |
202 | memset (desc, 0, sizeof (*desc)); | |
affc96b5 | 203 | |
62bd5d66 AW |
204 | desc->name = name; |
205 | desc->print = scm_port_print; | |
206 | desc->write = write; | |
207 | desc->flush = flush_port_default; | |
208 | desc->end_input = end_input_default; | |
209 | desc->fill_input = fill_input; | |
affc96b5 | 210 | |
62bd5d66 | 211 | ptobnum = scm_c_port_type_add_x (desc); |
affc96b5 | 212 | |
62bd5d66 | 213 | /* Make a class object if GOOPS is present. */ |
63385df2 | 214 | if (SCM_UNPACK (scm_port_class[0]) != 0) |
62bd5d66 AW |
215 | scm_make_port_classes (ptobnum, name); |
216 | ||
217 | return scm_tc7_port + ptobnum * 256; | |
0f2d19dd JB |
218 | } |
219 | ||
f12733c9 | 220 | void |
23f2b9a3 | 221 | scm_set_port_mark (scm_t_bits tc, SCM (*mark) (SCM)) |
f12733c9 | 222 | { |
62bd5d66 | 223 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->mark = mark; |
f12733c9 MD |
224 | } |
225 | ||
226 | void | |
23f2b9a3 | 227 | scm_set_port_free (scm_t_bits tc, size_t (*free) (SCM)) |
f12733c9 | 228 | { |
62bd5d66 | 229 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->free = free; |
f12733c9 MD |
230 | } |
231 | ||
232 | void | |
23f2b9a3 | 233 | scm_set_port_print (scm_t_bits tc, int (*print) (SCM exp, SCM port, |
19b8d12b | 234 | scm_print_state *pstate)) |
f12733c9 | 235 | { |
62bd5d66 | 236 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->print = print; |
f12733c9 MD |
237 | } |
238 | ||
239 | void | |
23f2b9a3 | 240 | scm_set_port_equalp (scm_t_bits tc, SCM (*equalp) (SCM, SCM)) |
f12733c9 | 241 | { |
62bd5d66 | 242 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->equalp = equalp; |
f12733c9 MD |
243 | } |
244 | ||
31703ab8 | 245 | void |
19b8d12b | 246 | scm_set_port_close (scm_t_bits tc, int (*close) (SCM)) |
31703ab8 | 247 | { |
19b8d12b | 248 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->close = close; |
31703ab8 GH |
249 | } |
250 | ||
f12733c9 | 251 | void |
19b8d12b | 252 | scm_set_port_flush (scm_t_bits tc, void (*flush) (SCM port)) |
f12733c9 | 253 | { |
03a2eeb0 AW |
254 | scm_t_ptob_descriptor *ptob = scm_c_port_type_ref (SCM_TC2PTOBNUM (tc)); |
255 | ptob->flush = flush; | |
256 | ptob->flags |= SCM_PORT_TYPE_HAS_FLUSH; | |
f12733c9 MD |
257 | } |
258 | ||
259 | void | |
19b8d12b | 260 | scm_set_port_end_input (scm_t_bits tc, void (*end_input) (SCM port, int offset)) |
f12733c9 | 261 | { |
19b8d12b | 262 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->end_input = end_input; |
f12733c9 MD |
263 | } |
264 | ||
265 | void | |
19b8d12b | 266 | scm_set_port_seek (scm_t_bits tc, scm_t_off (*seek) (SCM, scm_t_off, int)) |
f12733c9 | 267 | { |
62bd5d66 | 268 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->seek = seek; |
f12733c9 MD |
269 | } |
270 | ||
271 | void | |
f1ce9199 | 272 | scm_set_port_truncate (scm_t_bits tc, void (*truncate) (SCM, scm_t_off)) |
f12733c9 | 273 | { |
62bd5d66 | 274 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->truncate = truncate; |
f12733c9 MD |
275 | } |
276 | ||
277 | void | |
23f2b9a3 | 278 | scm_set_port_input_waiting (scm_t_bits tc, int (*input_waiting) (SCM)) |
f12733c9 | 279 | { |
62bd5d66 | 280 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->input_waiting = input_waiting; |
f12733c9 MD |
281 | } |
282 | ||
0f2d19dd | 283 | \f |
0f2d19dd | 284 | |
d68fee48 | 285 | /* Standard ports --- current input, output, error, and more(!). */ |
0f2d19dd | 286 | |
34297700 AW |
287 | static SCM cur_inport_fluid = SCM_BOOL_F; |
288 | static SCM cur_outport_fluid = SCM_BOOL_F; | |
289 | static SCM cur_errport_fluid = SCM_BOOL_F; | |
290 | static SCM cur_loadport_fluid = SCM_BOOL_F; | |
9de87eea | 291 | |
3b3b36dd | 292 | SCM_DEFINE (scm_current_input_port, "current-input-port", 0, 0, 0, |
e1546b65 MG |
293 | (), |
294 | "Return the current input port. This is the default port used\n" | |
295 | "by many input procedures. Initially, @code{current-input-port}\n" | |
296 | "returns the @dfn{standard input} in Unix and C terminology.") | |
1bbd0b84 | 297 | #define FUNC_NAME s_scm_current_input_port |
0f2d19dd | 298 | { |
34297700 | 299 | if (scm_is_true (cur_inport_fluid)) |
889975e5 MG |
300 | return scm_fluid_ref (cur_inport_fluid); |
301 | else | |
302 | return SCM_BOOL_F; | |
0f2d19dd | 303 | } |
1bbd0b84 | 304 | #undef FUNC_NAME |
0f2d19dd | 305 | |
3b3b36dd | 306 | SCM_DEFINE (scm_current_output_port, "current-output-port", 0, 0, 0, |
e1546b65 MG |
307 | (), |
308 | "Return the current output port. This is the default port used\n" | |
9401323e | 309 | "by many output procedures. Initially,\n" |
e1546b65 MG |
310 | "@code{current-output-port} returns the @dfn{standard output} in\n" |
311 | "Unix and C terminology.") | |
1bbd0b84 | 312 | #define FUNC_NAME s_scm_current_output_port |
0f2d19dd | 313 | { |
34297700 | 314 | if (scm_is_true (cur_outport_fluid)) |
889975e5 MG |
315 | return scm_fluid_ref (cur_outport_fluid); |
316 | else | |
317 | return SCM_BOOL_F; | |
0f2d19dd | 318 | } |
1bbd0b84 | 319 | #undef FUNC_NAME |
0f2d19dd | 320 | |
3b3b36dd | 321 | SCM_DEFINE (scm_current_error_port, "current-error-port", 0, 0, 0, |
1bbd0b84 | 322 | (), |
b380b885 MD |
323 | "Return the port to which errors and warnings should be sent (the\n" |
324 | "@dfn{standard error} in Unix and C terminology).") | |
1bbd0b84 | 325 | #define FUNC_NAME s_scm_current_error_port |
0f2d19dd | 326 | { |
34297700 | 327 | if (scm_is_true (cur_errport_fluid)) |
889975e5 MG |
328 | return scm_fluid_ref (cur_errport_fluid); |
329 | else | |
330 | return SCM_BOOL_F; | |
0f2d19dd | 331 | } |
1bbd0b84 | 332 | #undef FUNC_NAME |
0f2d19dd | 333 | |
3972de76 AW |
334 | SCM |
335 | scm_current_warning_port (void) | |
336 | { | |
337 | static SCM cwp_var = SCM_BOOL_F; | |
338 | ||
339 | if (scm_is_false (cwp_var)) | |
340 | cwp_var = scm_c_private_lookup ("guile", "current-warning-port"); | |
341 | ||
342 | return scm_call_0 (scm_variable_ref (cwp_var)); | |
343 | } | |
344 | ||
3b3b36dd | 345 | SCM_DEFINE (scm_current_load_port, "current-load-port", 0, 0, 0, |
e1546b65 | 346 | (), |
b450f070 | 347 | "Return the current-load-port.\n" |
e1546b65 | 348 | "The load port is used internally by @code{primitive-load}.") |
1bbd0b84 | 349 | #define FUNC_NAME s_scm_current_load_port |
31614d8e | 350 | { |
9de87eea | 351 | return scm_fluid_ref (cur_loadport_fluid); |
31614d8e | 352 | } |
1bbd0b84 | 353 | #undef FUNC_NAME |
31614d8e | 354 | |
3b3b36dd | 355 | SCM_DEFINE (scm_set_current_input_port, "set-current-input-port", 1, 0, 0, |
1bbd0b84 | 356 | (SCM port), |
8f85c0c6 NJ |
357 | "@deffnx {Scheme Procedure} set-current-output-port port\n" |
358 | "@deffnx {Scheme Procedure} set-current-error-port port\n" | |
b380b885 MD |
359 | "Change the ports returned by @code{current-input-port},\n" |
360 | "@code{current-output-port} and @code{current-error-port}, respectively,\n" | |
361 | "so that they use the supplied @var{port} for input or output.") | |
1bbd0b84 | 362 | #define FUNC_NAME s_scm_set_current_input_port |
0f2d19dd | 363 | { |
9de87eea | 364 | SCM oinp = scm_fluid_ref (cur_inport_fluid); |
34d19ef6 | 365 | SCM_VALIDATE_OPINPORT (1, port); |
9de87eea | 366 | scm_fluid_set_x (cur_inport_fluid, port); |
0f2d19dd JB |
367 | return oinp; |
368 | } | |
1bbd0b84 | 369 | #undef FUNC_NAME |
0f2d19dd JB |
370 | |
371 | ||
3b3b36dd | 372 | SCM_DEFINE (scm_set_current_output_port, "set-current-output-port", 1, 0, 0, |
e1546b65 MG |
373 | (SCM port), |
374 | "Set the current default output port to @var{port}.") | |
1bbd0b84 | 375 | #define FUNC_NAME s_scm_set_current_output_port |
0f2d19dd | 376 | { |
9de87eea | 377 | SCM ooutp = scm_fluid_ref (cur_outport_fluid); |
78446828 | 378 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 379 | SCM_VALIDATE_OPOUTPORT (1, port); |
9de87eea | 380 | scm_fluid_set_x (cur_outport_fluid, port); |
0f2d19dd JB |
381 | return ooutp; |
382 | } | |
1bbd0b84 | 383 | #undef FUNC_NAME |
0f2d19dd JB |
384 | |
385 | ||
3b3b36dd | 386 | SCM_DEFINE (scm_set_current_error_port, "set-current-error-port", 1, 0, 0, |
e1546b65 MG |
387 | (SCM port), |
388 | "Set the current default error port to @var{port}.") | |
1bbd0b84 | 389 | #define FUNC_NAME s_scm_set_current_error_port |
0f2d19dd | 390 | { |
9de87eea | 391 | SCM oerrp = scm_fluid_ref (cur_errport_fluid); |
78446828 | 392 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 393 | SCM_VALIDATE_OPOUTPORT (1, port); |
9de87eea | 394 | scm_fluid_set_x (cur_errport_fluid, port); |
0f2d19dd JB |
395 | return oerrp; |
396 | } | |
1bbd0b84 | 397 | #undef FUNC_NAME |
0f2d19dd | 398 | |
3972de76 AW |
399 | |
400 | SCM | |
401 | scm_set_current_warning_port (SCM port) | |
402 | { | |
403 | static SCM cwp_var = SCM_BOOL_F; | |
404 | ||
405 | if (scm_is_false (cwp_var)) | |
406 | cwp_var = scm_c_private_lookup ("guile", "current-warning-port"); | |
407 | ||
408 | return scm_call_1 (scm_variable_ref (cwp_var), port); | |
409 | } | |
410 | ||
411 | ||
185e369a | 412 | void |
661ae7ab | 413 | scm_dynwind_current_input_port (SCM port) |
9de87eea | 414 | #define FUNC_NAME NULL |
185e369a | 415 | { |
9de87eea | 416 | SCM_VALIDATE_OPINPORT (1, port); |
661ae7ab | 417 | scm_dynwind_fluid (cur_inport_fluid, port); |
185e369a | 418 | } |
9de87eea | 419 | #undef FUNC_NAME |
185e369a MV |
420 | |
421 | void | |
661ae7ab | 422 | scm_dynwind_current_output_port (SCM port) |
9de87eea | 423 | #define FUNC_NAME NULL |
185e369a | 424 | { |
9de87eea MV |
425 | port = SCM_COERCE_OUTPORT (port); |
426 | SCM_VALIDATE_OPOUTPORT (1, port); | |
661ae7ab | 427 | scm_dynwind_fluid (cur_outport_fluid, port); |
185e369a | 428 | } |
9de87eea | 429 | #undef FUNC_NAME |
185e369a MV |
430 | |
431 | void | |
661ae7ab | 432 | scm_dynwind_current_error_port (SCM port) |
9de87eea MV |
433 | #define FUNC_NAME NULL |
434 | { | |
435 | port = SCM_COERCE_OUTPORT (port); | |
436 | SCM_VALIDATE_OPOUTPORT (1, port); | |
661ae7ab | 437 | scm_dynwind_fluid (cur_errport_fluid, port); |
9de87eea MV |
438 | } |
439 | #undef FUNC_NAME | |
440 | ||
441 | void | |
661ae7ab | 442 | scm_i_dynwind_current_load_port (SCM port) |
185e369a | 443 | { |
661ae7ab | 444 | scm_dynwind_fluid (cur_loadport_fluid, port); |
185e369a MV |
445 | } |
446 | ||
19b8d12b | 447 | |
0f2d19dd | 448 | \f |
0f2d19dd | 449 | |
19b8d12b AW |
450 | /* Retrieving a port's mode. */ |
451 | ||
452 | /* Return the flags that characterize a port based on the mode | |
453 | * string used to open a file for that port. | |
454 | * | |
455 | * See PORT FLAGS in scm.h | |
5dbc6c06 | 456 | */ |
19b8d12b AW |
457 | |
458 | static long | |
459 | scm_i_mode_bits_n (SCM modes) | |
460 | { | |
461 | return (SCM_OPN | |
462 | | (scm_i_string_contains_char (modes, 'r') | |
463 | || scm_i_string_contains_char (modes, '+') ? SCM_RDNG : 0) | |
464 | | (scm_i_string_contains_char (modes, 'w') | |
465 | || scm_i_string_contains_char (modes, 'a') | |
466 | || scm_i_string_contains_char (modes, '+') ? SCM_WRTNG : 0) | |
467 | | (scm_i_string_contains_char (modes, '0') ? SCM_BUF0 : 0) | |
468 | | (scm_i_string_contains_char (modes, 'l') ? SCM_BUFLINE : 0)); | |
469 | } | |
470 | ||
471 | long | |
472 | scm_mode_bits (char *modes) | |
473 | { | |
474 | return scm_i_mode_bits (scm_from_locale_string (modes)); | |
475 | } | |
476 | ||
477 | long | |
478 | scm_i_mode_bits (SCM modes) | |
479 | { | |
480 | long bits; | |
481 | ||
482 | if (!scm_is_string (modes)) | |
483 | scm_wrong_type_arg_msg (NULL, 0, modes, "string"); | |
484 | ||
485 | bits = scm_i_mode_bits_n (modes); | |
486 | scm_remember_upto_here_1 (modes); | |
487 | return bits; | |
488 | } | |
489 | ||
490 | /* Return the mode flags from an open port. | |
491 | * Some modes such as "append" are only used when opening | |
492 | * a file and are not returned here. */ | |
493 | ||
494 | SCM_DEFINE (scm_port_mode, "port-mode", 1, 0, 0, | |
495 | (SCM port), | |
496 | "Return the port modes associated with the open port @var{port}.\n" | |
497 | "These will not necessarily be identical to the modes used when\n" | |
498 | "the port was opened, since modes such as \"append\" which are\n" | |
499 | "used only during port creation are not retained.") | |
500 | #define FUNC_NAME s_scm_port_mode | |
501 | { | |
502 | char modes[4]; | |
503 | modes[0] = '\0'; | |
504 | ||
505 | port = SCM_COERCE_OUTPORT (port); | |
506 | SCM_VALIDATE_OPPORT (1, port); | |
507 | if (SCM_CELL_WORD_0 (port) & SCM_RDNG) { | |
508 | if (SCM_CELL_WORD_0 (port) & SCM_WRTNG) | |
509 | strcpy (modes, "r+"); | |
510 | else | |
511 | strcpy (modes, "r"); | |
512 | } | |
513 | else if (SCM_CELL_WORD_0 (port) & SCM_WRTNG) | |
514 | strcpy (modes, "w"); | |
515 | if (SCM_CELL_WORD_0 (port) & SCM_BUF0) | |
516 | strcat (modes, "0"); | |
517 | ||
518 | return scm_from_latin1_string (modes); | |
519 | } | |
520 | #undef FUNC_NAME | |
521 | ||
522 | ||
523 | \f | |
524 | ||
525 | /* The port table --- a weak set of all ports. | |
526 | ||
527 | We need a global registry of ports to flush them all at exit, and to | |
528 | get all the ports matching a file descriptor. */ | |
2721f918 | 529 | SCM scm_i_port_weak_set; |
b9ad392e | 530 | |
19b8d12b | 531 | |
651a0735 | 532 | \f |
651a0735 | 533 | |
19b8d12b | 534 | /* Port finalization. */ |
1cc91f1b | 535 | |
5a771d5f AW |
536 | struct do_free_data |
537 | { | |
538 | scm_t_ptob_descriptor *ptob; | |
539 | SCM port; | |
540 | }; | |
541 | ||
542 | static SCM | |
543 | do_free (void *body_data) | |
544 | { | |
545 | struct do_free_data *data = body_data; | |
546 | ||
547 | /* `close' is for explicit `close-port' by user. `free' is for this | |
548 | purpose: ports collected by the GC. */ | |
549 | data->ptob->free (data->port); | |
550 | ||
551 | return SCM_BOOL_T; | |
552 | } | |
553 | ||
651a0735 LC |
554 | /* Finalize the object (a port) pointed to by PTR. */ |
555 | static void | |
556 | finalize_port (GC_PTR ptr, GC_PTR data) | |
557 | { | |
21041372 | 558 | SCM port = SCM_PACK_POINTER (ptr); |
651a0735 LC |
559 | |
560 | if (!SCM_PORTP (port)) | |
561 | abort (); | |
562 | ||
563 | if (SCM_OPENP (port)) | |
564 | { | |
3753e227 | 565 | struct do_free_data data; |
651a0735 | 566 | |
3753e227 | 567 | SCM_CLR_PORT_OPEN_FLAG (port); |
651a0735 | 568 | |
3753e227 AW |
569 | data.ptob = SCM_PORT_DESCRIPTOR (port); |
570 | data.port = port; | |
5a771d5f | 571 | |
3753e227 AW |
572 | scm_internal_catch (SCM_BOOL_T, do_free, &data, |
573 | scm_handle_by_message_noexit, NULL); | |
5a771d5f | 574 | |
3753e227 | 575 | scm_gc_ports_collected++; |
651a0735 LC |
576 | } |
577 | } | |
578 | ||
579 | ||
651a0735 LC |
580 | \f |
581 | ||
da220f27 | 582 | SCM |
2721f918 AW |
583 | scm_c_make_port_with_encoding (scm_t_bits tag, unsigned long mode_bits, |
584 | const char *encoding, | |
585 | scm_t_string_failed_conversion_handler handler, | |
586 | scm_t_bits stream) | |
0f2d19dd | 587 | { |
2721f918 AW |
588 | SCM ret; |
589 | scm_t_port *entry; | |
62bd5d66 | 590 | scm_t_ptob_descriptor *ptob; |
2721f918 AW |
591 | |
592 | entry = (scm_t_port *) scm_gc_calloc (sizeof (scm_t_port), "port"); | |
62bd5d66 AW |
593 | ptob = scm_c_port_type_ref (SCM_TC2PTOBNUM (tag)); |
594 | ||
595 | ret = scm_words (tag | mode_bits, 3); | |
596 | SCM_SET_CELL_WORD_1 (ret, (scm_t_bits) entry); | |
597 | SCM_SET_CELL_WORD_2 (ret, (scm_t_bits) ptob); | |
5f16b897 | 598 | |
92c0ebac AW |
599 | entry->lock = scm_gc_malloc_pointerless (sizeof (*entry->lock), "port lock"); |
600 | scm_i_pthread_mutex_init (entry->lock, scm_i_pthread_mutexattr_recursive); | |
30b126d2 | 601 | |
840ae05d | 602 | entry->file_name = SCM_BOOL_F; |
61e452ba | 603 | entry->rw_active = SCM_PORT_NEITHER; |
2721f918 AW |
604 | entry->port = ret; |
605 | entry->stream = stream; | |
606 | entry->encoding = encoding ? scm_gc_strdup (encoding, "port") : NULL; | |
6c98257f AW |
607 | if (encoding && strcmp (encoding, "UTF-8") == 0) |
608 | entry->encoding_mode = SCM_PORT_ENCODING_MODE_UTF8; | |
609 | else | |
610 | entry->encoding_mode = SCM_PORT_ENCODING_MODE_ICONV; | |
2721f918 | 611 | entry->ilseq_handler = handler; |
6c98257f | 612 | entry->iconv_descriptors = NULL; |
f4bc4e59 | 613 | |
6978c673 AW |
614 | if (SCM_PORT_DESCRIPTOR (ret)->free) |
615 | scm_i_set_finalizer (SCM2PTR (ret), finalize_port, NULL); | |
616 | ||
03a2eeb0 AW |
617 | if (SCM_PORT_DESCRIPTOR (ret)->flags & SCM_PORT_TYPE_HAS_FLUSH) |
618 | scm_weak_set_add_x (scm_i_port_weak_set, ret); | |
651a0735 | 619 | |
2721f918 AW |
620 | return ret; |
621 | } | |
622 | ||
623 | SCM | |
624 | scm_c_make_port (scm_t_bits tag, unsigned long mode_bits, scm_t_bits stream) | |
625 | { | |
626 | return scm_c_make_port_with_encoding (tag, mode_bits, | |
627 | scm_i_default_port_encoding (), | |
628 | scm_i_get_conversion_strategy (SCM_BOOL_F), | |
629 | stream); | |
630 | } | |
631 | ||
632 | SCM | |
633 | scm_new_port_table_entry (scm_t_bits tag) | |
634 | { | |
635 | return scm_c_make_port (tag, 0, 0); | |
0f2d19dd JB |
636 | } |
637 | ||
d68fee48 | 638 | \f |
d68fee48 | 639 | |
19b8d12b | 640 | /* Predicates. */ |
1cc91f1b | 641 | |
19b8d12b AW |
642 | SCM_DEFINE (scm_port_p, "port?", 1, 0, 0, |
643 | (SCM x), | |
644 | "Return a boolean indicating whether @var{x} is a port.\n" | |
645 | "Equivalent to @code{(or (input-port? @var{x}) (output-port?\n" | |
646 | "@var{x}))}.") | |
647 | #define FUNC_NAME s_scm_port_p | |
0f2d19dd | 648 | { |
19b8d12b | 649 | return scm_from_bool (SCM_PORTP (x)); |
0f2d19dd | 650 | } |
19b8d12b | 651 | #undef FUNC_NAME |
0f2d19dd | 652 | |
19b8d12b AW |
653 | SCM_DEFINE (scm_input_port_p, "input-port?", 1, 0, 0, |
654 | (SCM x), | |
655 | "Return @code{#t} if @var{x} is an input port, otherwise return\n" | |
656 | "@code{#f}. Any object satisfying this predicate also satisfies\n" | |
657 | "@code{port?}.") | |
658 | #define FUNC_NAME s_scm_input_port_p | |
0f2d19dd | 659 | { |
19b8d12b | 660 | return scm_from_bool (SCM_INPUT_PORT_P (x)); |
0f2d19dd | 661 | } |
1bbd0b84 | 662 | #undef FUNC_NAME |
0f2d19dd | 663 | |
19b8d12b AW |
664 | SCM_DEFINE (scm_output_port_p, "output-port?", 1, 0, 0, |
665 | (SCM x), | |
666 | "Return @code{#t} if @var{x} is an output port, otherwise return\n" | |
667 | "@code{#f}. Any object satisfying this predicate also satisfies\n" | |
668 | "@code{port?}.") | |
669 | #define FUNC_NAME s_scm_output_port_p | |
0f2d19dd | 670 | { |
19b8d12b AW |
671 | x = SCM_COERCE_OUTPORT (x); |
672 | return scm_from_bool (SCM_OUTPUT_PORT_P (x)); | |
0f2d19dd | 673 | } |
1bbd0b84 | 674 | #undef FUNC_NAME |
0f2d19dd | 675 | |
19b8d12b AW |
676 | SCM_DEFINE (scm_port_closed_p, "port-closed?", 1, 0, 0, |
677 | (SCM port), | |
678 | "Return @code{#t} if @var{port} is closed or @code{#f} if it is\n" | |
679 | "open.") | |
680 | #define FUNC_NAME s_scm_port_closed_p | |
d617ee18 | 681 | { |
19b8d12b AW |
682 | SCM_VALIDATE_PORT (1, port); |
683 | return scm_from_bool (!SCM_OPPORTP (port)); | |
d617ee18 | 684 | } |
19b8d12b | 685 | #undef FUNC_NAME |
eadd48de | 686 | |
19b8d12b AW |
687 | SCM_DEFINE (scm_eof_object_p, "eof-object?", 1, 0, 0, |
688 | (SCM x), | |
689 | "Return @code{#t} if @var{x} is an end-of-file object; otherwise\n" | |
690 | "return @code{#f}.") | |
691 | #define FUNC_NAME s_scm_eof_object_p | |
eadd48de | 692 | { |
19b8d12b | 693 | return scm_from_bool (SCM_EOF_OBJECT_P (x)); |
eadd48de | 694 | } |
1bbd0b84 | 695 | #undef FUNC_NAME |
eadd48de GH |
696 | |
697 | ||
d68fee48 | 698 | \f |
19b8d12b | 699 | |
d68fee48 JB |
700 | /* Closing ports. */ |
701 | ||
03a2eeb0 AW |
702 | static void close_iconv_descriptors (scm_t_iconv_descriptors *id); |
703 | ||
0f2d19dd JB |
704 | /* scm_close_port |
705 | * Call the close operation on a port object. | |
eadd48de | 706 | * see also scm_close. |
0f2d19dd | 707 | */ |
3b3b36dd | 708 | SCM_DEFINE (scm_close_port, "close-port", 1, 0, 0, |
1bbd0b84 | 709 | (SCM port), |
1e6808ea MG |
710 | "Close the specified port object. Return @code{#t} if it\n" |
711 | "successfully closes a port or @code{#f} if it was already\n" | |
712 | "closed. An exception may be raised if an error occurs, for\n" | |
713 | "example when flushing buffered output. See also @ref{Ports and\n" | |
714 | "File Descriptors, close}, for a procedure which can close file\n" | |
715 | "descriptors.") | |
1bbd0b84 | 716 | #define FUNC_NAME s_scm_close_port |
0f2d19dd | 717 | { |
03a2eeb0 | 718 | scm_t_port *p; |
eadd48de GH |
719 | int rv; |
720 | ||
78446828 MV |
721 | port = SCM_COERCE_OUTPORT (port); |
722 | ||
7a754ca6 | 723 | SCM_VALIDATE_PORT (1, port); |
0f2d19dd | 724 | if (SCM_CLOSEDP (port)) |
eadd48de | 725 | return SCM_BOOL_F; |
03a2eeb0 AW |
726 | |
727 | p = SCM_PTAB_ENTRY (port); | |
5a771d5f | 728 | SCM_CLR_PORT_OPEN_FLAG (port); |
03a2eeb0 AW |
729 | |
730 | if (SCM_PORT_DESCRIPTOR (port)->flags & SCM_PORT_TYPE_HAS_FLUSH) | |
731 | scm_weak_set_remove_x (scm_i_port_weak_set, port); | |
732 | ||
5a771d5f AW |
733 | if (SCM_PORT_DESCRIPTOR (port)->close) |
734 | /* Note! This may throw an exception. Anything after this point | |
735 | should be resilient to non-local exits. */ | |
736 | rv = SCM_PORT_DESCRIPTOR (port)->close (port); | |
737 | else | |
738 | rv = 0; | |
03a2eeb0 AW |
739 | |
740 | if (p->iconv_descriptors) | |
741 | { | |
5a771d5f AW |
742 | /* If we don't get here, the iconv_descriptors finalizer will |
743 | clean up. */ | |
03a2eeb0 AW |
744 | close_iconv_descriptors (p->iconv_descriptors); |
745 | p->iconv_descriptors = NULL; | |
746 | } | |
747 | ||
7888309b | 748 | return scm_from_bool (rv >= 0); |
7a754ca6 MD |
749 | } |
750 | #undef FUNC_NAME | |
751 | ||
752 | SCM_DEFINE (scm_close_input_port, "close-input-port", 1, 0, 0, | |
753 | (SCM port), | |
754 | "Close the specified input port object. The routine has no effect if\n" | |
755 | "the file has already been closed. An exception may be raised if an\n" | |
756 | "error occurs. The value returned is unspecified.\n\n" | |
757 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" | |
758 | "which can close file descriptors.") | |
759 | #define FUNC_NAME s_scm_close_input_port | |
760 | { | |
761 | SCM_VALIDATE_INPUT_PORT (1, port); | |
762 | scm_close_port (port); | |
763 | return SCM_UNSPECIFIED; | |
764 | } | |
765 | #undef FUNC_NAME | |
766 | ||
767 | SCM_DEFINE (scm_close_output_port, "close-output-port", 1, 0, 0, | |
768 | (SCM port), | |
769 | "Close the specified output port object. The routine has no effect if\n" | |
770 | "the file has already been closed. An exception may be raised if an\n" | |
771 | "error occurs. The value returned is unspecified.\n\n" | |
772 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" | |
773 | "which can close file descriptors.") | |
774 | #define FUNC_NAME s_scm_close_output_port | |
775 | { | |
776 | port = SCM_COERCE_OUTPORT (port); | |
777 | SCM_VALIDATE_OUTPUT_PORT (1, port); | |
778 | scm_close_port (port); | |
779 | return SCM_UNSPECIFIED; | |
0f2d19dd | 780 | } |
1bbd0b84 | 781 | #undef FUNC_NAME |
0f2d19dd | 782 | |
2721f918 | 783 | |
19b8d12b | 784 | \f |
2721f918 | 785 | |
19b8d12b AW |
786 | /* Encoding characters to byte streams, and decoding byte streams to |
787 | characters. */ | |
5dbc6c06 | 788 | |
19b8d12b AW |
789 | /* A fluid specifying the default encoding for newly created ports. If it is |
790 | a string, that is the encoding. If it is #f, it is in the "native" | |
791 | (Latin-1) encoding. */ | |
792 | SCM_VARIABLE (default_port_encoding_var, "%default-port-encoding"); | |
793 | ||
794 | static int scm_port_encoding_init = 0; | |
795 | ||
796 | /* Use ENCODING as the default encoding for future ports. */ | |
c536b4b3 | 797 | void |
19b8d12b | 798 | scm_i_set_default_port_encoding (const char *encoding) |
c2ca4493 | 799 | { |
19b8d12b AW |
800 | if (!scm_port_encoding_init |
801 | || !scm_is_fluid (SCM_VARIABLE_REF (default_port_encoding_var))) | |
802 | scm_misc_error (NULL, "tried to set port encoding fluid before it is initialized", | |
803 | SCM_EOL); | |
fdfe6305 | 804 | |
19b8d12b AW |
805 | if (encoding == NULL |
806 | || !strcmp (encoding, "ASCII") | |
807 | || !strcmp (encoding, "ANSI_X3.4-1968") | |
808 | || !strcmp (encoding, "ISO-8859-1")) | |
809 | scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var), SCM_BOOL_F); | |
810 | else | |
811 | scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var), | |
812 | scm_from_locale_string (encoding)); | |
2721f918 | 813 | } |
3a5fb14d | 814 | |
19b8d12b AW |
815 | /* Return the name of the default encoding for newly created ports; a |
816 | return value of NULL means "ISO-8859-1". */ | |
817 | const char * | |
818 | scm_i_default_port_encoding (void) | |
2721f918 | 819 | { |
19b8d12b AW |
820 | if (!scm_port_encoding_init) |
821 | return NULL; | |
822 | else if (!scm_is_fluid (SCM_VARIABLE_REF (default_port_encoding_var))) | |
823 | return NULL; | |
824 | else | |
825 | { | |
826 | SCM encoding; | |
827 | ||
828 | encoding = scm_fluid_ref (SCM_VARIABLE_REF (default_port_encoding_var)); | |
829 | if (!scm_is_string (encoding)) | |
830 | return NULL; | |
831 | else | |
832 | return scm_i_string_chars (encoding); | |
833 | } | |
c536b4b3 | 834 | } |
fdfe6305 | 835 | |
6c98257f AW |
836 | static void |
837 | finalize_iconv_descriptors (GC_PTR ptr, GC_PTR data) | |
c536b4b3 | 838 | { |
6c98257f AW |
839 | close_iconv_descriptors (ptr); |
840 | } | |
c2ca4493 | 841 | |
6c98257f AW |
842 | static scm_t_iconv_descriptors * |
843 | open_iconv_descriptors (const char *encoding, int reading, int writing) | |
844 | { | |
845 | scm_t_iconv_descriptors *id; | |
846 | iconv_t input_cd, output_cd; | |
c536b4b3 | 847 | |
6c98257f AW |
848 | input_cd = (iconv_t) -1; |
849 | output_cd = (iconv_t) -1; | |
d68fee48 | 850 | |
6c98257f AW |
851 | if (reading) |
852 | { | |
853 | /* Open an input iconv conversion descriptor, from ENCODING | |
854 | to UTF-8. We choose UTF-8, not UTF-32, because iconv | |
855 | implementations can typically convert from anything to | |
856 | UTF-8, but not to UTF-32 (see | |
857 | <http://lists.gnu.org/archive/html/bug-libunistring/2010-09/msg00007.html>). */ | |
858 | ||
859 | /* Assume opening an iconv descriptor causes about 16 KB of | |
860 | allocation. */ | |
861 | scm_gc_register_allocation (16 * 1024); | |
862 | ||
8dfb7bbf | 863 | scm_i_lock_iconv (); |
6c98257f | 864 | input_cd = iconv_open ("UTF-8", encoding); |
8dfb7bbf | 865 | scm_i_unlock_iconv (); |
6c98257f AW |
866 | if (input_cd == (iconv_t) -1) |
867 | goto invalid_encoding; | |
868 | } | |
0f2d19dd | 869 | |
6c98257f | 870 | if (writing) |
19b8d12b | 871 | { |
6c98257f AW |
872 | /* Assume opening an iconv descriptor causes about 16 KB of |
873 | allocation. */ | |
874 | scm_gc_register_allocation (16 * 1024); | |
0f2d19dd | 875 | |
8dfb7bbf | 876 | scm_i_lock_iconv (); |
6c98257f | 877 | output_cd = iconv_open (encoding, "UTF-8"); |
8dfb7bbf | 878 | scm_i_unlock_iconv (); |
6c98257f AW |
879 | if (output_cd == (iconv_t) -1) |
880 | { | |
8dfb7bbf | 881 | scm_i_lock_iconv (); |
6c98257f AW |
882 | if (input_cd != (iconv_t) -1) |
883 | iconv_close (input_cd); | |
8dfb7bbf | 884 | scm_i_unlock_iconv (); |
6c98257f AW |
885 | goto invalid_encoding; |
886 | } | |
19b8d12b | 887 | } |
eb5c0a2a | 888 | |
6c98257f AW |
889 | id = scm_gc_malloc_pointerless (sizeof (*id), "iconv descriptors"); |
890 | id->input_cd = input_cd; | |
891 | id->output_cd = output_cd; | |
892 | ||
6978c673 AW |
893 | /* Register a finalizer to close the descriptors. */ |
894 | scm_i_set_finalizer (id, finalize_iconv_descriptors, NULL); | |
19b8d12b | 895 | |
6c98257f | 896 | return id; |
19b8d12b AW |
897 | |
898 | invalid_encoding: | |
899 | { | |
900 | SCM err; | |
901 | err = scm_from_locale_string (encoding); | |
6c98257f | 902 | scm_misc_error ("open_iconv_descriptors", |
19b8d12b AW |
903 | "invalid or unknown character encoding ~s", |
904 | scm_list_1 (err)); | |
905 | } | |
0f2d19dd JB |
906 | } |
907 | ||
6c98257f AW |
908 | static void |
909 | close_iconv_descriptors (scm_t_iconv_descriptors *id) | |
910 | { | |
8dfb7bbf | 911 | scm_i_lock_iconv (); |
6c98257f AW |
912 | if (id->input_cd != (iconv_t) -1) |
913 | iconv_close (id->input_cd); | |
914 | if (id->output_cd != (iconv_t) -1) | |
915 | iconv_close (id->output_cd); | |
8dfb7bbf | 916 | scm_i_unlock_iconv (); |
6c98257f AW |
917 | id->input_cd = (void *) -1; |
918 | id->output_cd = (void *) -1; | |
919 | } | |
920 | ||
921 | scm_t_iconv_descriptors * | |
922 | scm_i_port_iconv_descriptors (SCM port) | |
923 | { | |
924 | scm_t_port *pt; | |
925 | ||
926 | pt = SCM_PTAB_ENTRY (port); | |
927 | ||
928 | assert (pt->encoding_mode == SCM_PORT_ENCODING_MODE_ICONV); | |
929 | ||
930 | if (!pt->iconv_descriptors) | |
931 | { | |
932 | if (!pt->encoding) | |
933 | pt->encoding = "ISO-8859-1"; | |
934 | pt->iconv_descriptors = | |
935 | open_iconv_descriptors (pt->encoding, | |
936 | SCM_INPUT_PORT_P (port), | |
937 | SCM_OUTPUT_PORT_P (port)); | |
938 | } | |
939 | ||
940 | return pt->iconv_descriptors; | |
941 | } | |
942 | ||
943 | void | |
944 | scm_i_set_port_encoding_x (SCM port, const char *encoding) | |
945 | { | |
946 | scm_t_port *pt; | |
947 | scm_t_iconv_descriptors *prev; | |
948 | ||
949 | /* Set the character encoding for this port. */ | |
950 | pt = SCM_PTAB_ENTRY (port); | |
951 | prev = pt->iconv_descriptors; | |
952 | ||
953 | if (encoding == NULL) | |
954 | encoding = "ISO-8859-1"; | |
955 | ||
956 | if (strcmp (encoding, "UTF-8") == 0) | |
957 | { | |
958 | pt->encoding = "UTF-8"; | |
959 | pt->encoding_mode = SCM_PORT_ENCODING_MODE_UTF8; | |
960 | pt->iconv_descriptors = NULL; | |
961 | } | |
962 | else | |
963 | { | |
964 | /* Open descriptors before mutating the port. */ | |
965 | pt->iconv_descriptors = | |
966 | open_iconv_descriptors (encoding, | |
967 | SCM_INPUT_PORT_P (port), | |
968 | SCM_OUTPUT_PORT_P (port)); | |
969 | pt->encoding = scm_gc_strdup (encoding, "port"); | |
970 | pt->encoding_mode = SCM_PORT_ENCODING_MODE_ICONV; | |
971 | } | |
972 | ||
973 | if (prev) | |
974 | close_iconv_descriptors (prev); | |
975 | } | |
976 | ||
19b8d12b AW |
977 | SCM_DEFINE (scm_port_encoding, "port-encoding", 1, 0, 0, |
978 | (SCM port), | |
979 | "Returns, as a string, the character encoding that @var{port}\n" | |
980 | "uses to interpret its input and output.\n") | |
981 | #define FUNC_NAME s_scm_port_encoding | |
0f2d19dd | 982 | { |
19b8d12b AW |
983 | scm_t_port *pt; |
984 | const char *enc; | |
985 | ||
986 | SCM_VALIDATE_PORT (1, port); | |
987 | ||
988 | pt = SCM_PTAB_ENTRY (port); | |
989 | enc = pt->encoding; | |
990 | if (enc) | |
991 | return scm_from_locale_string (pt->encoding); | |
0f2d19dd | 992 | else |
19b8d12b | 993 | return SCM_BOOL_F; |
0f2d19dd | 994 | } |
1bbd0b84 | 995 | #undef FUNC_NAME |
0f2d19dd | 996 | |
19b8d12b AW |
997 | SCM_DEFINE (scm_set_port_encoding_x, "set-port-encoding!", 2, 0, 0, |
998 | (SCM port, SCM enc), | |
999 | "Sets the character encoding that will be used to interpret all\n" | |
1000 | "port I/O. New ports are created with the encoding\n" | |
1001 | "appropriate for the current locale if @code{setlocale} has \n" | |
1002 | "been called or ISO-8859-1 otherwise\n" | |
1003 | "and this procedure can be used to modify that encoding.\n") | |
1004 | #define FUNC_NAME s_scm_set_port_encoding_x | |
5dbc6c06 | 1005 | { |
19b8d12b | 1006 | char *enc_str; |
5dbc6c06 | 1007 | |
19b8d12b AW |
1008 | SCM_VALIDATE_PORT (1, port); |
1009 | SCM_VALIDATE_STRING (2, enc); | |
0f2d19dd | 1010 | |
19b8d12b AW |
1011 | enc_str = scm_to_locale_string (enc); |
1012 | scm_i_set_port_encoding_x (port, enc_str); | |
1013 | free (enc_str); | |
1014 | ||
1015 | return SCM_UNSPECIFIED; | |
0f2d19dd | 1016 | } |
1bbd0b84 | 1017 | #undef FUNC_NAME |
0f2d19dd | 1018 | |
f4bc4e59 | 1019 | |
19b8d12b AW |
1020 | /* This determines how conversions handle unconvertible characters. */ |
1021 | SCM_GLOBAL_VARIABLE (scm_conversion_strategy, "%port-conversion-strategy"); | |
1022 | static int scm_conversion_strategy_init = 0; | |
889975e5 | 1023 | |
19b8d12b AW |
1024 | scm_t_string_failed_conversion_handler |
1025 | scm_i_get_conversion_strategy (SCM port) | |
f4bc4e59 | 1026 | { |
19b8d12b AW |
1027 | SCM encoding; |
1028 | ||
1029 | if (scm_is_false (port)) | |
f4bc4e59 | 1030 | { |
19b8d12b AW |
1031 | if (!scm_conversion_strategy_init |
1032 | || !scm_is_fluid (SCM_VARIABLE_REF (scm_conversion_strategy))) | |
1033 | return SCM_FAILED_CONVERSION_QUESTION_MARK; | |
1034 | else | |
1035 | { | |
1036 | encoding = scm_fluid_ref (SCM_VARIABLE_REF (scm_conversion_strategy)); | |
1037 | if (scm_is_false (encoding)) | |
1038 | return SCM_FAILED_CONVERSION_QUESTION_MARK; | |
1039 | else | |
1040 | return (scm_t_string_failed_conversion_handler) scm_to_int (encoding); | |
1041 | } | |
f4bc4e59 | 1042 | } |
19b8d12b | 1043 | else |
f4bc4e59 | 1044 | { |
19b8d12b AW |
1045 | scm_t_port *pt; |
1046 | pt = SCM_PTAB_ENTRY (port); | |
1047 | return pt->ilseq_handler; | |
f4bc4e59 | 1048 | } |
19b8d12b AW |
1049 | |
1050 | } | |
1051 | ||
1052 | void | |
1053 | scm_i_set_conversion_strategy_x (SCM port, | |
1054 | scm_t_string_failed_conversion_handler handler) | |
1055 | { | |
1056 | SCM strategy; | |
1057 | scm_t_port *pt; | |
1058 | ||
1059 | strategy = scm_from_int ((int) handler); | |
1060 | ||
1061 | if (scm_is_false (port)) | |
f4bc4e59 | 1062 | { |
19b8d12b AW |
1063 | /* Set the default encoding for future ports. */ |
1064 | if (!scm_conversion_strategy_init | |
1065 | || !scm_is_fluid (SCM_VARIABLE_REF (scm_conversion_strategy))) | |
1066 | scm_misc_error (NULL, "tried to set conversion strategy fluid before it is initialized", | |
1067 | SCM_EOL); | |
1068 | scm_fluid_set_x (SCM_VARIABLE_REF (scm_conversion_strategy), strategy); | |
f4bc4e59 LC |
1069 | } |
1070 | else | |
1071 | { | |
19b8d12b AW |
1072 | /* Set the character encoding for this port. */ |
1073 | pt = SCM_PTAB_ENTRY (port); | |
1074 | pt->ilseq_handler = handler; | |
f4bc4e59 | 1075 | } |
f4bc4e59 LC |
1076 | } |
1077 | ||
19b8d12b AW |
1078 | SCM_DEFINE (scm_port_conversion_strategy, "port-conversion-strategy", |
1079 | 1, 0, 0, (SCM port), | |
1080 | "Returns the behavior of the port when handling a character that\n" | |
1081 | "is not representable in the port's current encoding.\n" | |
1082 | "It returns the symbol @code{error} if unrepresentable characters\n" | |
1083 | "should cause exceptions, @code{substitute} if the port should\n" | |
1084 | "try to replace unrepresentable characters with question marks or\n" | |
1085 | "approximate characters, or @code{escape} if unrepresentable\n" | |
1086 | "characters should be converted to string escapes.\n" | |
1087 | "\n" | |
1088 | "If @var{port} is @code{#f}, then the current default behavior\n" | |
1089 | "will be returned. New ports will have this default behavior\n" | |
1090 | "when they are created.\n") | |
1091 | #define FUNC_NAME s_scm_port_conversion_strategy | |
889975e5 | 1092 | { |
19b8d12b | 1093 | scm_t_string_failed_conversion_handler h; |
7b292a9d | 1094 | |
19b8d12b | 1095 | SCM_VALIDATE_OPPORT (1, port); |
7b292a9d | 1096 | |
19b8d12b | 1097 | if (!scm_is_false (port)) |
7b292a9d | 1098 | { |
19b8d12b | 1099 | SCM_VALIDATE_OPPORT (1, port); |
7b292a9d LC |
1100 | } |
1101 | ||
19b8d12b AW |
1102 | h = scm_i_get_conversion_strategy (port); |
1103 | if (h == SCM_FAILED_CONVERSION_ERROR) | |
1104 | return scm_from_latin1_symbol ("error"); | |
1105 | else if (h == SCM_FAILED_CONVERSION_QUESTION_MARK) | |
1106 | return scm_from_latin1_symbol ("substitute"); | |
1107 | else if (h == SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE) | |
1108 | return scm_from_latin1_symbol ("escape"); | |
1109 | else | |
1110 | abort (); | |
7b292a9d | 1111 | |
19b8d12b AW |
1112 | /* Never gets here. */ |
1113 | return SCM_UNDEFINED; | |
1114 | } | |
1115 | #undef FUNC_NAME | |
7b292a9d | 1116 | |
19b8d12b AW |
1117 | SCM_DEFINE (scm_set_port_conversion_strategy_x, "set-port-conversion-strategy!", |
1118 | 2, 0, 0, | |
1119 | (SCM port, SCM sym), | |
1120 | "Sets the behavior of the interpreter when outputting a character\n" | |
1121 | "that is not representable in the port's current encoding.\n" | |
1122 | "@var{sym} can be either @code{'error}, @code{'substitute}, or\n" | |
1123 | "@code{'escape}. If it is @code{'error}, an error will be thrown\n" | |
1124 | "when an unconvertible character is encountered. If it is\n" | |
1125 | "@code{'substitute}, then unconvertible characters will \n" | |
1126 | "be replaced with approximate characters, or with question marks\n" | |
1127 | "if no approximately correct character is available.\n" | |
1128 | "If it is @code{'escape},\n" | |
1129 | "it will appear as a hex escape when output.\n" | |
1130 | "\n" | |
1131 | "If @var{port} is an open port, the conversion error behavior\n" | |
1132 | "is set for that port. If it is @code{#f}, it is set as the\n" | |
1133 | "default behavior for any future ports that get created in\n" | |
1134 | "this thread.\n") | |
1135 | #define FUNC_NAME s_scm_set_port_conversion_strategy_x | |
1136 | { | |
1137 | SCM err; | |
1138 | SCM qm; | |
1139 | SCM esc; | |
7be1705d | 1140 | |
19b8d12b | 1141 | if (!scm_is_false (port)) |
7b292a9d | 1142 | { |
19b8d12b AW |
1143 | SCM_VALIDATE_OPPORT (1, port); |
1144 | } | |
7b292a9d | 1145 | |
19b8d12b AW |
1146 | err = scm_from_latin1_symbol ("error"); |
1147 | if (scm_is_true (scm_eqv_p (sym, err))) | |
1148 | { | |
1149 | scm_i_set_conversion_strategy_x (port, SCM_FAILED_CONVERSION_ERROR); | |
1150 | return SCM_UNSPECIFIED; | |
1151 | } | |
7b292a9d | 1152 | |
19b8d12b AW |
1153 | qm = scm_from_latin1_symbol ("substitute"); |
1154 | if (scm_is_true (scm_eqv_p (sym, qm))) | |
1155 | { | |
1156 | scm_i_set_conversion_strategy_x (port, | |
1157 | SCM_FAILED_CONVERSION_QUESTION_MARK); | |
1158 | return SCM_UNSPECIFIED; | |
1159 | } | |
7b292a9d | 1160 | |
19b8d12b AW |
1161 | esc = scm_from_latin1_symbol ("escape"); |
1162 | if (scm_is_true (scm_eqv_p (sym, esc))) | |
1163 | { | |
1164 | scm_i_set_conversion_strategy_x (port, | |
1165 | SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE); | |
1166 | return SCM_UNSPECIFIED; | |
1167 | } | |
7b292a9d | 1168 | |
19b8d12b | 1169 | SCM_MISC_ERROR ("unknown conversion behavior ~s", scm_list_1 (sym)); |
7b292a9d | 1170 | |
19b8d12b AW |
1171 | return SCM_UNSPECIFIED; |
1172 | } | |
1173 | #undef FUNC_NAME | |
7be1705d | 1174 | |
7b292a9d | 1175 | |
19b8d12b | 1176 | \f |
7b292a9d | 1177 | |
14dcb5cc AW |
1178 | /* The port lock. */ |
1179 | ||
1180 | static void | |
92c0ebac | 1181 | lock_port (void *mutex) |
14dcb5cc | 1182 | { |
92c0ebac | 1183 | scm_i_pthread_mutex_lock (mutex); |
14dcb5cc AW |
1184 | } |
1185 | ||
1186 | static void | |
92c0ebac | 1187 | unlock_port (void *mutex) |
14dcb5cc | 1188 | { |
92c0ebac | 1189 | scm_i_pthread_mutex_unlock (mutex); |
14dcb5cc AW |
1190 | } |
1191 | ||
1192 | void | |
1193 | scm_dynwind_lock_port (SCM port) | |
92c0ebac | 1194 | #define FUNC_NAME "dynwind-lock-port" |
14dcb5cc | 1195 | { |
92c0ebac AW |
1196 | scm_i_pthread_mutex_t *lock; |
1197 | SCM_VALIDATE_OPPORT (SCM_ARG1, port); | |
1198 | scm_c_lock_port (port, &lock); | |
1199 | if (lock) | |
1200 | { | |
1201 | scm_dynwind_unwind_handler (unlock_port, lock, SCM_F_WIND_EXPLICITLY); | |
1202 | scm_dynwind_rewind_handler (lock_port, lock, 0); | |
1203 | } | |
14dcb5cc | 1204 | } |
92c0ebac | 1205 | #undef FUNC_NAME |
14dcb5cc AW |
1206 | |
1207 | ||
1208 | \f | |
1209 | ||
19b8d12b | 1210 | /* Input. */ |
7be1705d | 1211 | |
0d959103 AW |
1212 | int |
1213 | scm_get_byte_or_eof (SCM port) | |
1214 | { | |
92c0ebac | 1215 | scm_i_pthread_mutex_t *lock; |
0d959103 AW |
1216 | int ret; |
1217 | ||
92c0ebac | 1218 | scm_c_lock_port (port, &lock); |
0d959103 | 1219 | ret = scm_get_byte_or_eof_unlocked (port); |
92c0ebac AW |
1220 | if (lock) |
1221 | scm_i_pthread_mutex_unlock (lock); | |
0d959103 AW |
1222 | |
1223 | return ret; | |
1224 | } | |
1225 | ||
1226 | int | |
1227 | scm_peek_byte_or_eof (SCM port) | |
1228 | { | |
92c0ebac | 1229 | scm_i_pthread_mutex_t *lock; |
0d959103 AW |
1230 | int ret; |
1231 | ||
92c0ebac | 1232 | scm_c_lock_port (port, &lock); |
0d959103 | 1233 | ret = scm_peek_byte_or_eof_unlocked (port); |
92c0ebac AW |
1234 | if (lock) |
1235 | scm_i_pthread_mutex_unlock (lock); | |
0d959103 AW |
1236 | |
1237 | return ret; | |
1238 | } | |
1239 | ||
19b8d12b AW |
1240 | /* scm_c_read |
1241 | * | |
1242 | * Used by an application to read arbitrary number of bytes from an | |
1243 | * SCM port. Same semantics as libc read, except that scm_c_read only | |
1244 | * returns less than SIZE bytes if at end-of-file. | |
1245 | * | |
1246 | * Warning: Doesn't update port line and column counts! */ | |
7b292a9d | 1247 | |
19b8d12b AW |
1248 | /* This structure, and the following swap_buffer function, are used |
1249 | for temporarily swapping a port's own read buffer, and the buffer | |
1250 | that the caller of scm_c_read provides. */ | |
1251 | struct port_and_swap_buffer | |
1252 | { | |
1253 | scm_t_port *pt; | |
1254 | unsigned char *buffer; | |
1255 | size_t size; | |
1256 | }; | |
7b292a9d | 1257 | |
19b8d12b AW |
1258 | static void |
1259 | swap_buffer (void *data) | |
1260 | { | |
1261 | struct port_and_swap_buffer *psb = (struct port_and_swap_buffer *) data; | |
1262 | unsigned char *old_buf = psb->pt->read_buf; | |
1263 | size_t old_size = psb->pt->read_buf_size; | |
7be1705d | 1264 | |
19b8d12b AW |
1265 | /* Make the port use (buffer, size) from the struct. */ |
1266 | psb->pt->read_pos = psb->pt->read_buf = psb->pt->read_end = psb->buffer; | |
1267 | psb->pt->read_buf_size = psb->size; | |
7b292a9d | 1268 | |
19b8d12b AW |
1269 | /* Save the port's old (buffer, size) in the struct. */ |
1270 | psb->buffer = old_buf; | |
1271 | psb->size = old_size; | |
7b292a9d LC |
1272 | } |
1273 | ||
19b8d12b | 1274 | size_t |
be632904 | 1275 | scm_c_read_unlocked (SCM port, void *buffer, size_t size) |
19b8d12b | 1276 | #define FUNC_NAME "scm_c_read" |
7b292a9d LC |
1277 | { |
1278 | scm_t_port *pt; | |
19b8d12b AW |
1279 | size_t n_read = 0, n_available; |
1280 | struct port_and_swap_buffer psb; | |
889975e5 | 1281 | |
19b8d12b | 1282 | SCM_VALIDATE_OPINPORT (1, port); |
889975e5 | 1283 | |
19b8d12b AW |
1284 | pt = SCM_PTAB_ENTRY (port); |
1285 | if (pt->rw_active == SCM_PORT_WRITE) | |
1286 | SCM_PORT_DESCRIPTOR (port)->flush (port); | |
889975e5 | 1287 | |
19b8d12b AW |
1288 | if (pt->rw_random) |
1289 | pt->rw_active = SCM_PORT_READ; | |
889975e5 | 1290 | |
19b8d12b AW |
1291 | /* Take bytes first from the port's read buffer. */ |
1292 | if (pt->read_pos < pt->read_end) | |
1293 | { | |
1294 | n_available = min (size, pt->read_end - pt->read_pos); | |
1295 | memcpy (buffer, pt->read_pos, n_available); | |
1296 | buffer = (char *) buffer + n_available; | |
1297 | pt->read_pos += n_available; | |
1298 | n_read += n_available; | |
1299 | size -= n_available; | |
1300 | } | |
889975e5 | 1301 | |
19b8d12b AW |
1302 | /* Avoid the scm_dynwind_* costs if we now have enough data. */ |
1303 | if (size == 0) | |
1304 | return n_read; | |
b5cb4464 NJ |
1305 | |
1306 | /* Now we will call scm_fill_input repeatedly until we have read the | |
1307 | requested number of bytes. (Note that a single scm_fill_input | |
1308 | call does not guarantee to fill the whole of the port's read | |
6d227556 | 1309 | buffer.) */ |
75192345 | 1310 | if (pt->read_buf_size <= 1 && pt->encoding == NULL) |
b5cb4464 | 1311 | { |
6d227556 NJ |
1312 | /* The port that we are reading from is unbuffered - i.e. does |
1313 | not have its own persistent buffer - but we have a buffer, | |
1314 | provided by our caller, that is the right size for the data | |
1315 | that is wanted. For the following scm_fill_input calls, | |
1316 | therefore, we use the buffer in hand as the port's read | |
1317 | buffer. | |
1318 | ||
1319 | We need to make sure that the port's normal (1 byte) buffer | |
1320 | is reinstated in case one of the scm_fill_input () calls | |
1321 | throws an exception; we use the scm_dynwind_* API to achieve | |
75192345 MG |
1322 | that. |
1323 | ||
1324 | A consequence of this optimization is that the fill_input | |
1325 | functions can't unget characters. That'll push data to the | |
1326 | pushback buffer instead of this psb buffer. */ | |
1327 | #if SCM_DEBUG == 1 | |
1328 | unsigned char *pback = pt->putback_buf; | |
1329 | #endif | |
6d227556 NJ |
1330 | psb.pt = pt; |
1331 | psb.buffer = buffer; | |
1332 | psb.size = size; | |
1333 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); | |
1334 | scm_dynwind_rewind_handler (swap_buffer, &psb, SCM_F_WIND_EXPLICITLY); | |
1335 | scm_dynwind_unwind_handler (swap_buffer, &psb, SCM_F_WIND_EXPLICITLY); | |
1336 | ||
1337 | /* Call scm_fill_input until we have all the bytes that we need, | |
1338 | or we hit EOF. */ | |
4251ae2e | 1339 | while (pt->read_buf_size && (scm_fill_input_unlocked (port) != EOF)) |
6d227556 NJ |
1340 | { |
1341 | pt->read_buf_size -= (pt->read_end - pt->read_pos); | |
1342 | pt->read_pos = pt->read_buf = pt->read_end; | |
1343 | } | |
75192345 MG |
1344 | #if SCM_DEBUG == 1 |
1345 | if (pback != pt->putback_buf | |
1346 | || pt->read_buf - (unsigned char *) buffer < 0) | |
1347 | scm_misc_error (FUNC_NAME, | |
1348 | "scm_c_read must not call a fill function that pushes " | |
1349 | "back characters onto an unbuffered port", SCM_EOL); | |
1350 | #endif | |
6d227556 | 1351 | n_read += pt->read_buf - (unsigned char *) buffer; |
75192345 | 1352 | |
6d227556 NJ |
1353 | /* Reinstate the port's normal buffer. */ |
1354 | scm_dynwind_end (); | |
1355 | } | |
1356 | else | |
1357 | { | |
1358 | /* The port has its own buffer. It is important that we use it, | |
1359 | even if it happens to be smaller than our caller's buffer, so | |
1360 | that a custom port implementation's entry points (in | |
1361 | particular, fill_input) can rely on the buffer always being | |
1362 | the same as they first set up. */ | |
4251ae2e | 1363 | while (size && (scm_fill_input_unlocked (port) != EOF)) |
6d227556 NJ |
1364 | { |
1365 | n_available = min (size, pt->read_end - pt->read_pos); | |
1366 | memcpy (buffer, pt->read_pos, n_available); | |
1367 | buffer = (char *) buffer + n_available; | |
1368 | pt->read_pos += n_available; | |
1369 | n_read += n_available; | |
1370 | size -= n_available; | |
1371 | } | |
1372 | } | |
6fe692e9 | 1373 | |
b5cb4464 | 1374 | return n_read; |
6fe692e9 | 1375 | } |
693758d5 | 1376 | #undef FUNC_NAME |
6fe692e9 | 1377 | |
be632904 AW |
1378 | size_t |
1379 | scm_c_read (SCM port, void *buffer, size_t size) | |
1380 | { | |
92c0ebac | 1381 | scm_i_pthread_mutex_t *lock; |
be632904 AW |
1382 | size_t ret; |
1383 | ||
92c0ebac | 1384 | scm_c_lock_port (port, &lock); |
be632904 | 1385 | ret = scm_c_read_unlocked (port, buffer, size); |
92c0ebac AW |
1386 | if (lock) |
1387 | scm_i_pthread_mutex_unlock (lock); | |
1388 | ||
be632904 AW |
1389 | |
1390 | return ret; | |
1391 | } | |
1392 | ||
19b8d12b AW |
1393 | /* Update the line and column number of PORT after consumption of C. */ |
1394 | static inline void | |
1395 | update_port_lf (scm_t_wchar c, SCM port) | |
6fe692e9 | 1396 | { |
19b8d12b AW |
1397 | switch (c) |
1398 | { | |
1399 | case '\a': | |
1400 | case EOF: | |
1401 | break; | |
1402 | case '\b': | |
1403 | SCM_DECCOL (port); | |
1404 | break; | |
1405 | case '\n': | |
1406 | SCM_INCLINE (port); | |
1407 | break; | |
1408 | case '\r': | |
1409 | SCM_ZEROCOL (port); | |
1410 | break; | |
1411 | case '\t': | |
1412 | SCM_TABCOL (port); | |
1413 | break; | |
1414 | default: | |
1415 | SCM_INCCOL (port); | |
1416 | break; | |
1417 | } | |
1418 | } | |
6fe692e9 | 1419 | |
19b8d12b | 1420 | #define SCM_MBCHAR_BUF_SIZE (4) |
6fe692e9 | 1421 | |
19b8d12b AW |
1422 | /* Convert the SIZE-byte UTF-8 sequence in UTF8_BUF to a codepoint. |
1423 | UTF8_BUF is assumed to contain a valid UTF-8 sequence. */ | |
1424 | static scm_t_wchar | |
1425 | utf8_to_codepoint (const scm_t_uint8 *utf8_buf, size_t size) | |
283a1a0e | 1426 | { |
19b8d12b | 1427 | scm_t_wchar codepoint; |
283a1a0e | 1428 | |
19b8d12b | 1429 | if (utf8_buf[0] <= 0x7f) |
283a1a0e | 1430 | { |
19b8d12b AW |
1431 | assert (size == 1); |
1432 | codepoint = utf8_buf[0]; | |
1433 | } | |
1434 | else if ((utf8_buf[0] & 0xe0) == 0xc0) | |
1435 | { | |
1436 | assert (size == 2); | |
1437 | codepoint = ((scm_t_wchar) utf8_buf[0] & 0x1f) << 6UL | |
1438 | | (utf8_buf[1] & 0x3f); | |
1439 | } | |
1440 | else if ((utf8_buf[0] & 0xf0) == 0xe0) | |
1441 | { | |
1442 | assert (size == 3); | |
1443 | codepoint = ((scm_t_wchar) utf8_buf[0] & 0x0f) << 12UL | |
1444 | | ((scm_t_wchar) utf8_buf[1] & 0x3f) << 6UL | |
1445 | | (utf8_buf[2] & 0x3f); | |
283a1a0e GH |
1446 | } |
1447 | else | |
19b8d12b AW |
1448 | { |
1449 | assert (size == 4); | |
1450 | codepoint = ((scm_t_wchar) utf8_buf[0] & 0x07) << 18UL | |
1451 | | ((scm_t_wchar) utf8_buf[1] & 0x3f) << 12UL | |
1452 | | ((scm_t_wchar) utf8_buf[2] & 0x3f) << 6UL | |
1453 | | (utf8_buf[3] & 0x3f); | |
1454 | } | |
283a1a0e | 1455 | |
19b8d12b | 1456 | return codepoint; |
283a1a0e GH |
1457 | } |
1458 | ||
19b8d12b AW |
1459 | /* Read a UTF-8 sequence from PORT. On success, return 0 and set |
1460 | *CODEPOINT to the codepoint that was read, fill BUF with its UTF-8 | |
1461 | representation, and set *LEN to the length in bytes. Return | |
1462 | `EILSEQ' on error. */ | |
1463 | static int | |
1464 | get_utf8_codepoint (SCM port, scm_t_wchar *codepoint, | |
1465 | scm_t_uint8 buf[SCM_MBCHAR_BUF_SIZE], size_t *len) | |
1466 | { | |
1467 | #define ASSERT_NOT_EOF(b) \ | |
1468 | if (SCM_UNLIKELY ((b) == EOF)) \ | |
1469 | goto invalid_seq | |
1470 | #define CONSUME_PEEKED_BYTE() \ | |
1471 | pt->read_pos++ | |
ee149d03 | 1472 | |
19b8d12b AW |
1473 | int byte; |
1474 | scm_t_port *pt; | |
ee149d03 | 1475 | |
19b8d12b AW |
1476 | *len = 0; |
1477 | pt = SCM_PTAB_ENTRY (port); | |
840ae05d | 1478 | |
0d959103 | 1479 | byte = scm_get_byte_or_eof_unlocked (port); |
19b8d12b | 1480 | if (byte == EOF) |
6c951427 | 1481 | { |
19b8d12b AW |
1482 | *codepoint = EOF; |
1483 | return 0; | |
1484 | } | |
6c951427 | 1485 | |
19b8d12b AW |
1486 | buf[0] = (scm_t_uint8) byte; |
1487 | *len = 1; | |
6c951427 | 1488 | |
19b8d12b AW |
1489 | if (buf[0] <= 0x7f) |
1490 | /* 1-byte form. */ | |
1491 | *codepoint = buf[0]; | |
1492 | else if (buf[0] >= 0xc2 && buf[0] <= 0xdf) | |
1493 | { | |
1494 | /* 2-byte form. */ | |
0d959103 | 1495 | byte = scm_peek_byte_or_eof_unlocked (port); |
19b8d12b | 1496 | ASSERT_NOT_EOF (byte); |
6c951427 | 1497 | |
19b8d12b AW |
1498 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80)) |
1499 | goto invalid_seq; | |
6c951427 | 1500 | |
19b8d12b AW |
1501 | CONSUME_PEEKED_BYTE (); |
1502 | buf[1] = (scm_t_uint8) byte; | |
1503 | *len = 2; | |
1504 | ||
1505 | *codepoint = ((scm_t_wchar) buf[0] & 0x1f) << 6UL | |
1506 | | (buf[1] & 0x3f); | |
6c951427 | 1507 | } |
19b8d12b | 1508 | else if ((buf[0] & 0xf0) == 0xe0) |
6c951427 | 1509 | { |
19b8d12b | 1510 | /* 3-byte form. */ |
0d959103 | 1511 | byte = scm_peek_byte_or_eof_unlocked (port); |
19b8d12b | 1512 | ASSERT_NOT_EOF (byte); |
6c951427 | 1513 | |
19b8d12b AW |
1514 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80 |
1515 | || (buf[0] == 0xe0 && byte < 0xa0) | |
1516 | || (buf[0] == 0xed && byte > 0x9f))) | |
1517 | goto invalid_seq; | |
6c951427 | 1518 | |
19b8d12b AW |
1519 | CONSUME_PEEKED_BYTE (); |
1520 | buf[1] = (scm_t_uint8) byte; | |
1521 | *len = 2; | |
1522 | ||
0d959103 | 1523 | byte = scm_peek_byte_or_eof_unlocked (port); |
19b8d12b AW |
1524 | ASSERT_NOT_EOF (byte); |
1525 | ||
1526 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80)) | |
1527 | goto invalid_seq; | |
1528 | ||
1529 | CONSUME_PEEKED_BYTE (); | |
1530 | buf[2] = (scm_t_uint8) byte; | |
1531 | *len = 3; | |
1532 | ||
1533 | *codepoint = ((scm_t_wchar) buf[0] & 0x0f) << 12UL | |
1534 | | ((scm_t_wchar) buf[1] & 0x3f) << 6UL | |
1535 | | (buf[2] & 0x3f); | |
6c951427 | 1536 | } |
19b8d12b AW |
1537 | else if (buf[0] >= 0xf0 && buf[0] <= 0xf4) |
1538 | { | |
1539 | /* 4-byte form. */ | |
0d959103 | 1540 | byte = scm_peek_byte_or_eof_unlocked (port); |
19b8d12b | 1541 | ASSERT_NOT_EOF (byte); |
6c951427 | 1542 | |
19b8d12b AW |
1543 | if (SCM_UNLIKELY (((byte & 0xc0) != 0x80) |
1544 | || (buf[0] == 0xf0 && byte < 0x90) | |
1545 | || (buf[0] == 0xf4 && byte > 0x8f))) | |
1546 | goto invalid_seq; | |
ee149d03 | 1547 | |
19b8d12b AW |
1548 | CONSUME_PEEKED_BYTE (); |
1549 | buf[1] = (scm_t_uint8) byte; | |
1550 | *len = 2; | |
889975e5 | 1551 | |
0d959103 | 1552 | byte = scm_peek_byte_or_eof_unlocked (port); |
19b8d12b | 1553 | ASSERT_NOT_EOF (byte); |
889975e5 | 1554 | |
19b8d12b AW |
1555 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80)) |
1556 | goto invalid_seq; | |
63479112 | 1557 | |
19b8d12b AW |
1558 | CONSUME_PEEKED_BYTE (); |
1559 | buf[2] = (scm_t_uint8) byte; | |
1560 | *len = 3; | |
63479112 | 1561 | |
0d959103 | 1562 | byte = scm_peek_byte_or_eof_unlocked (port); |
19b8d12b | 1563 | ASSERT_NOT_EOF (byte); |
63479112 | 1564 | |
19b8d12b AW |
1565 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80)) |
1566 | goto invalid_seq; | |
63479112 | 1567 | |
19b8d12b AW |
1568 | CONSUME_PEEKED_BYTE (); |
1569 | buf[3] = (scm_t_uint8) byte; | |
1570 | *len = 4; | |
840ae05d | 1571 | |
19b8d12b AW |
1572 | *codepoint = ((scm_t_wchar) buf[0] & 0x07) << 18UL |
1573 | | ((scm_t_wchar) buf[1] & 0x3f) << 12UL | |
1574 | | ((scm_t_wchar) buf[2] & 0x3f) << 6UL | |
1575 | | (buf[3] & 0x3f); | |
ee149d03 JB |
1576 | } |
1577 | else | |
19b8d12b | 1578 | goto invalid_seq; |
ee149d03 | 1579 | |
19b8d12b | 1580 | return 0; |
ee149d03 | 1581 | |
19b8d12b AW |
1582 | invalid_seq: |
1583 | /* Here we could choose the consume the faulty byte when it's not a | |
1584 | valid starting byte, but it's not a requirement. What Section 3.9 | |
1585 | of Unicode 6.0.0 mandates, though, is to not consume a byte that | |
1586 | would otherwise be a valid starting byte. */ | |
ee149d03 | 1587 | |
19b8d12b | 1588 | return EILSEQ; |
ee149d03 | 1589 | |
19b8d12b AW |
1590 | #undef CONSUME_PEEKED_BYTE |
1591 | #undef ASSERT_NOT_EOF | |
1592 | } | |
1593 | ||
1594 | /* Likewise, read a byte sequence from PORT, passing it through its | |
1595 | input conversion descriptor. */ | |
1596 | static int | |
1597 | get_iconv_codepoint (SCM port, scm_t_wchar *codepoint, | |
1598 | char buf[SCM_MBCHAR_BUF_SIZE], size_t *len) | |
1599 | { | |
6c98257f | 1600 | scm_t_iconv_descriptors *id; |
19b8d12b AW |
1601 | int err, byte_read; |
1602 | size_t bytes_consumed, output_size; | |
1603 | char *output; | |
1604 | scm_t_uint8 utf8_buf[SCM_MBCHAR_BUF_SIZE]; | |
1605 | ||
6c98257f | 1606 | id = scm_i_port_iconv_descriptors (port); |
19b8d12b AW |
1607 | |
1608 | for (output_size = 0, output = (char *) utf8_buf, | |
1609 | bytes_consumed = 0, err = 0; | |
1610 | err == 0 && output_size == 0 | |
1611 | && (bytes_consumed == 0 || byte_read != EOF); | |
1612 | bytes_consumed++) | |
1613 | { | |
1614 | char *input; | |
1615 | size_t input_left, output_left, done; | |
1616 | ||
0d959103 | 1617 | byte_read = scm_get_byte_or_eof_unlocked (port); |
19b8d12b AW |
1618 | if (byte_read == EOF) |
1619 | { | |
1620 | if (bytes_consumed == 0) | |
1621 | { | |
1622 | *codepoint = (scm_t_wchar) EOF; | |
1623 | *len = 0; | |
1624 | return 0; | |
1625 | } | |
1626 | else | |
1627 | continue; | |
1628 | } | |
1629 | ||
1630 | buf[bytes_consumed] = byte_read; | |
1631 | ||
1632 | input = buf; | |
1633 | input_left = bytes_consumed + 1; | |
1634 | output_left = sizeof (utf8_buf); | |
1635 | ||
6c98257f | 1636 | done = iconv (id->input_cd, &input, &input_left, &output, &output_left); |
19b8d12b AW |
1637 | if (done == (size_t) -1) |
1638 | { | |
1639 | err = errno; | |
1640 | if (err == EINVAL) | |
1641 | /* Missing input: keep trying. */ | |
1642 | err = 0; | |
1643 | } | |
1644 | else | |
1645 | output_size = sizeof (utf8_buf) - output_left; | |
1646 | } | |
1647 | ||
1648 | if (SCM_UNLIKELY (output_size == 0)) | |
1649 | /* An unterminated sequence. */ | |
1650 | err = EILSEQ; | |
1651 | else if (SCM_LIKELY (err == 0)) | |
1652 | { | |
1653 | /* Convert the UTF8_BUF sequence to a Unicode code point. */ | |
1654 | *codepoint = utf8_to_codepoint (utf8_buf, output_size); | |
1655 | *len = bytes_consumed; | |
1656 | } | |
1657 | ||
1658 | return err; | |
1659 | } | |
1660 | ||
1661 | /* Read a codepoint from PORT and return it in *CODEPOINT. Fill BUF | |
1662 | with the byte representation of the codepoint in PORT's encoding, and | |
1663 | set *LEN to the length in bytes of that representation. Return 0 on | |
1664 | success and an errno value on error. */ | |
1665 | static int | |
1666 | get_codepoint (SCM port, scm_t_wchar *codepoint, | |
1667 | char buf[SCM_MBCHAR_BUF_SIZE], size_t *len) | |
1668 | { | |
1669 | int err; | |
1670 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
1671 | ||
6c98257f | 1672 | if (pt->encoding_mode == SCM_PORT_ENCODING_MODE_UTF8) |
19b8d12b AW |
1673 | err = get_utf8_codepoint (port, codepoint, (scm_t_uint8 *) buf, len); |
1674 | else | |
1675 | err = get_iconv_codepoint (port, codepoint, buf, len); | |
1676 | ||
1677 | if (SCM_LIKELY (err == 0)) | |
1678 | update_port_lf (*codepoint, port); | |
1679 | else if (pt->ilseq_handler == SCM_ICONVEH_QUESTION_MARK) | |
1680 | { | |
1681 | *codepoint = '?'; | |
1682 | err = 0; | |
1683 | update_port_lf (*codepoint, port); | |
1684 | } | |
1685 | ||
1686 | return err; | |
1687 | } | |
1688 | ||
1689 | /* Read a codepoint from PORT and return it. */ | |
1690 | scm_t_wchar | |
be632904 | 1691 | scm_getc_unlocked (SCM port) |
19b8d12b AW |
1692 | #define FUNC_NAME "scm_getc" |
1693 | { | |
1694 | int err; | |
1695 | size_t len; | |
1696 | scm_t_wchar codepoint; | |
1697 | char buf[SCM_MBCHAR_BUF_SIZE]; | |
1698 | ||
1699 | err = get_codepoint (port, &codepoint, buf, &len); | |
1700 | if (SCM_UNLIKELY (err != 0)) | |
1701 | /* At this point PORT should point past the invalid encoding, as per | |
1702 | R6RS-lib Section 8.2.4. */ | |
1703 | scm_decoding_error (FUNC_NAME, err, "input decoding error", port); | |
1704 | ||
1705 | return codepoint; | |
1706 | } | |
1707 | #undef FUNC_NAME | |
1708 | ||
be632904 AW |
1709 | scm_t_wchar |
1710 | scm_getc (SCM port) | |
1711 | { | |
92c0ebac | 1712 | scm_i_pthread_mutex_t *lock; |
be632904 AW |
1713 | scm_t_wchar ret; |
1714 | ||
92c0ebac | 1715 | scm_c_lock_port (port, &lock); |
be632904 | 1716 | ret = scm_getc_unlocked (port); |
92c0ebac AW |
1717 | if (lock) |
1718 | scm_i_pthread_mutex_unlock (lock); | |
1719 | ||
be632904 AW |
1720 | |
1721 | return ret; | |
1722 | } | |
1723 | ||
19b8d12b AW |
1724 | SCM_DEFINE (scm_read_char, "read-char", 0, 1, 0, |
1725 | (SCM port), | |
1726 | "Return the next character available from @var{port}, updating\n" | |
1727 | "@var{port} to point to the following character. If no more\n" | |
1728 | "characters are available, the end-of-file object is returned.\n" | |
1729 | "\n" | |
1730 | "When @var{port}'s data cannot be decoded according to its\n" | |
1731 | "character encoding, a @code{decoding-error} is raised and\n" | |
1732 | "@var{port} points past the erroneous byte sequence.\n") | |
1733 | #define FUNC_NAME s_scm_read_char | |
1734 | { | |
1735 | scm_t_wchar c; | |
1736 | if (SCM_UNBNDP (port)) | |
1737 | port = scm_current_input_port (); | |
1738 | SCM_VALIDATE_OPINPORT (1, port); | |
be632904 | 1739 | c = scm_getc_unlocked (port); |
19b8d12b AW |
1740 | if (EOF == c) |
1741 | return SCM_EOF_VAL; | |
1742 | return SCM_MAKE_CHAR (c); | |
1743 | } | |
1744 | #undef FUNC_NAME | |
1745 | ||
1746 | ||
1747 | \f | |
1748 | ||
1749 | /* Pushback. */ | |
1750 | ||
1751 | void | |
c932ce0b | 1752 | scm_unget_byte_unlocked (int c, SCM port) |
19b8d12b AW |
1753 | #define FUNC_NAME "scm_unget_byte" |
1754 | { | |
1755 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
1756 | ||
1757 | if (pt->read_buf == pt->putback_buf) | |
1758 | /* already using the put-back buffer. */ | |
1759 | { | |
1760 | /* enlarge putback_buf if necessary. */ | |
1761 | if (pt->read_end == pt->read_buf + pt->read_buf_size | |
1762 | && pt->read_buf == pt->read_pos) | |
1763 | { | |
1764 | size_t new_size = pt->read_buf_size * 2; | |
1765 | unsigned char *tmp = (unsigned char *) | |
1766 | scm_gc_realloc (pt->putback_buf, pt->read_buf_size, new_size, | |
1767 | "putback buffer"); | |
1768 | ||
1769 | pt->read_pos = pt->read_buf = pt->putback_buf = tmp; | |
1770 | pt->read_end = pt->read_buf + pt->read_buf_size; | |
1771 | pt->read_buf_size = pt->putback_buf_size = new_size; | |
1772 | } | |
1773 | ||
1774 | /* shift any existing bytes to buffer + 1. */ | |
1775 | if (pt->read_pos == pt->read_end) | |
1776 | pt->read_end = pt->read_buf + 1; | |
1777 | else if (pt->read_pos != pt->read_buf + 1) | |
1778 | { | |
1779 | int count = pt->read_end - pt->read_pos; | |
1780 | ||
1781 | memmove (pt->read_buf + 1, pt->read_pos, count); | |
1782 | pt->read_end = pt->read_buf + 1 + count; | |
1783 | } | |
1784 | ||
1785 | pt->read_pos = pt->read_buf; | |
1786 | } | |
1787 | else | |
1788 | /* switch to the put-back buffer. */ | |
1789 | { | |
1790 | if (pt->putback_buf == NULL) | |
1791 | { | |
1792 | pt->putback_buf | |
1793 | = (unsigned char *) scm_gc_malloc_pointerless | |
1794 | (SCM_INITIAL_PUTBACK_BUF_SIZE, "putback buffer"); | |
1795 | pt->putback_buf_size = SCM_INITIAL_PUTBACK_BUF_SIZE; | |
1796 | } | |
1797 | ||
1798 | pt->saved_read_buf = pt->read_buf; | |
1799 | pt->saved_read_pos = pt->read_pos; | |
1800 | pt->saved_read_end = pt->read_end; | |
1801 | pt->saved_read_buf_size = pt->read_buf_size; | |
1802 | ||
1803 | pt->read_pos = pt->read_buf = pt->putback_buf; | |
1804 | pt->read_end = pt->read_buf + 1; | |
1805 | pt->read_buf_size = pt->putback_buf_size; | |
1806 | } | |
1807 | ||
1808 | *pt->read_buf = c; | |
1809 | ||
1810 | if (pt->rw_random) | |
1811 | pt->rw_active = SCM_PORT_READ; | |
1812 | } | |
1813 | #undef FUNC_NAME | |
1814 | ||
c932ce0b AW |
1815 | void |
1816 | scm_unget_byte (int c, SCM port) | |
1817 | { | |
92c0ebac AW |
1818 | scm_i_pthread_mutex_t *lock; |
1819 | scm_c_lock_port (port, &lock); | |
c932ce0b | 1820 | scm_unget_byte_unlocked (c, port); |
92c0ebac AW |
1821 | if (lock) |
1822 | scm_i_pthread_mutex_unlock (lock); | |
1823 | ||
c932ce0b AW |
1824 | } |
1825 | ||
19b8d12b | 1826 | void |
c932ce0b | 1827 | scm_ungetc_unlocked (scm_t_wchar c, SCM port) |
19b8d12b AW |
1828 | #define FUNC_NAME "scm_ungetc" |
1829 | { | |
1830 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
1831 | char *result; | |
1832 | char result_buf[10]; | |
1833 | const char *encoding; | |
1834 | size_t len; | |
1835 | int i; | |
1836 | ||
1837 | if (pt->encoding != NULL) | |
1838 | encoding = pt->encoding; | |
1839 | else | |
1840 | encoding = "ISO-8859-1"; | |
1841 | ||
1842 | len = sizeof (result_buf); | |
8dfb7bbf | 1843 | scm_i_lock_iconv (); |
19b8d12b AW |
1844 | result = u32_conv_to_encoding (encoding, |
1845 | (enum iconv_ilseq_handler) pt->ilseq_handler, | |
1846 | (uint32_t *) &c, 1, NULL, | |
1847 | result_buf, &len); | |
8dfb7bbf | 1848 | scm_i_unlock_iconv (); |
19b8d12b AW |
1849 | |
1850 | if (SCM_UNLIKELY (result == NULL || len == 0)) | |
1851 | scm_encoding_error (FUNC_NAME, errno, | |
1852 | "conversion to port encoding failed", | |
1853 | SCM_BOOL_F, SCM_MAKE_CHAR (c)); | |
1854 | ||
1855 | for (i = len - 1; i >= 0; i--) | |
c932ce0b | 1856 | scm_unget_byte_unlocked (result[i], port); |
19b8d12b AW |
1857 | |
1858 | if (SCM_UNLIKELY (result != result_buf)) | |
1859 | free (result); | |
1860 | ||
1861 | if (c == '\n') | |
1862 | { | |
1863 | /* What should col be in this case? | |
1864 | * We'll leave it at -1. | |
1865 | */ | |
1866 | SCM_LINUM (port) -= 1; | |
1867 | } | |
1868 | else | |
1869 | SCM_COL(port) -= 1; | |
1870 | } | |
1871 | #undef FUNC_NAME | |
1872 | ||
c932ce0b AW |
1873 | void |
1874 | scm_ungetc (scm_t_wchar c, SCM port) | |
1875 | { | |
92c0ebac AW |
1876 | scm_i_pthread_mutex_t *lock; |
1877 | scm_c_lock_port (port, &lock); | |
c932ce0b | 1878 | scm_ungetc_unlocked (c, port); |
92c0ebac AW |
1879 | if (lock) |
1880 | scm_i_pthread_mutex_unlock (lock); | |
1881 | ||
c932ce0b | 1882 | } |
19b8d12b AW |
1883 | |
1884 | void | |
c932ce0b | 1885 | scm_ungets_unlocked (const char *s, int n, SCM port) |
19b8d12b AW |
1886 | { |
1887 | /* This is simple minded and inefficient, but unreading strings is | |
1888 | * probably not a common operation, and remember that line and | |
1889 | * column numbers have to be handled... | |
1890 | * | |
1891 | * Please feel free to write an optimized version! | |
1892 | */ | |
1893 | while (n--) | |
c932ce0b | 1894 | scm_ungetc_unlocked (s[n], port); |
19b8d12b AW |
1895 | } |
1896 | ||
c932ce0b AW |
1897 | void |
1898 | scm_ungets (const char *s, int n, SCM port) | |
1899 | { | |
92c0ebac AW |
1900 | scm_i_pthread_mutex_t *lock; |
1901 | scm_c_lock_port (port, &lock); | |
c932ce0b | 1902 | scm_ungets_unlocked (s, n, port); |
92c0ebac AW |
1903 | if (lock) |
1904 | scm_i_pthread_mutex_unlock (lock); | |
1905 | ||
c932ce0b | 1906 | } |
19b8d12b AW |
1907 | |
1908 | SCM_DEFINE (scm_peek_char, "peek-char", 0, 1, 0, | |
1bbd0b84 | 1909 | (SCM port), |
1e6808ea MG |
1910 | "Return the next character available from @var{port},\n" |
1911 | "@emph{without} updating @var{port} to point to the following\n" | |
1912 | "character. If no more characters are available, the\n" | |
c2dfff19 KR |
1913 | "end-of-file object is returned.\n" |
1914 | "\n" | |
1915 | "The value returned by\n" | |
1e6808ea MG |
1916 | "a call to @code{peek-char} is the same as the value that would\n" |
1917 | "have been returned by a call to @code{read-char} on the same\n" | |
1918 | "port. The only difference is that the very next call to\n" | |
1919 | "@code{read-char} or @code{peek-char} on that @var{port} will\n" | |
1920 | "return the value returned by the preceding call to\n" | |
1921 | "@code{peek-char}. In particular, a call to @code{peek-char} on\n" | |
1922 | "an interactive port will hang waiting for input whenever a call\n" | |
c62da8f8 LC |
1923 | "to @code{read-char} would have hung.\n" |
1924 | "\n" | |
1925 | "As for @code{read-char}, a @code{decoding-error} may be raised\n" | |
1926 | "if such a situation occurs. However, unlike with @code{read-char},\n" | |
1927 | "@var{port} still points at the beginning of the erroneous byte\n" | |
1928 | "sequence when the error is raised.\n") | |
1bbd0b84 | 1929 | #define FUNC_NAME s_scm_peek_char |
ee149d03 | 1930 | { |
c62da8f8 | 1931 | int err; |
fd5eec2b LC |
1932 | SCM result; |
1933 | scm_t_wchar c; | |
1934 | char bytes[SCM_MBCHAR_BUF_SIZE]; | |
c62da8f8 | 1935 | long column, line, i; |
fd5eec2b LC |
1936 | size_t len; |
1937 | ||
ee149d03 | 1938 | if (SCM_UNBNDP (port)) |
9de87eea | 1939 | port = scm_current_input_port (); |
b2456dd4 | 1940 | SCM_VALIDATE_OPINPORT (1, port); |
fd5eec2b LC |
1941 | |
1942 | column = SCM_COL (port); | |
1943 | line = SCM_LINUM (port); | |
1944 | ||
c62da8f8 | 1945 | err = get_codepoint (port, &c, bytes, &len); |
fd5eec2b | 1946 | |
c62da8f8 | 1947 | for (i = len - 1; i >= 0; i--) |
c932ce0b | 1948 | scm_unget_byte_unlocked (bytes[i], port); |
fd5eec2b | 1949 | |
c62da8f8 LC |
1950 | SCM_COL (port) = column; |
1951 | SCM_LINUM (port) = line; | |
fd5eec2b | 1952 | |
c62da8f8 LC |
1953 | if (SCM_UNLIKELY (err != 0)) |
1954 | { | |
1955 | scm_decoding_error (FUNC_NAME, err, "input decoding error", port); | |
1956 | ||
1957 | /* Shouldn't happen since `catch' always aborts to prompt. */ | |
1958 | result = SCM_BOOL_F; | |
fd5eec2b | 1959 | } |
c62da8f8 LC |
1960 | else if (c == EOF) |
1961 | result = SCM_EOF_VAL; | |
1962 | else | |
1963 | result = SCM_MAKE_CHAR (c); | |
fd5eec2b LC |
1964 | |
1965 | return result; | |
3cb988bd | 1966 | } |
1bbd0b84 | 1967 | #undef FUNC_NAME |
3cb988bd | 1968 | |
1be4270a | 1969 | SCM_DEFINE (scm_unread_char, "unread-char", 1, 1, 0, |
1bbd0b84 | 1970 | (SCM cobj, SCM port), |
b7e64f8b BT |
1971 | "Place character @var{cobj} in @var{port} so that it will be\n" |
1972 | "read by the next read operation. If called multiple times, the\n" | |
1973 | "unread characters will be read again in last-in first-out\n" | |
1974 | "order. If @var{port} is not supplied, the current input port\n" | |
1975 | "is used.") | |
1bbd0b84 | 1976 | #define FUNC_NAME s_scm_unread_char |
0f2d19dd JB |
1977 | { |
1978 | int c; | |
1979 | ||
34d19ef6 | 1980 | SCM_VALIDATE_CHAR (1, cobj); |
0f2d19dd | 1981 | if (SCM_UNBNDP (port)) |
9de87eea | 1982 | port = scm_current_input_port (); |
b2456dd4 | 1983 | SCM_VALIDATE_OPINPORT (2, port); |
0f2d19dd | 1984 | |
7866a09b | 1985 | c = SCM_CHAR (cobj); |
0f2d19dd | 1986 | |
c932ce0b | 1987 | scm_ungetc_unlocked (c, port); |
0f2d19dd JB |
1988 | return cobj; |
1989 | } | |
1bbd0b84 | 1990 | #undef FUNC_NAME |
0f2d19dd | 1991 | |
a1ec6916 | 1992 | SCM_DEFINE (scm_unread_string, "unread-string", 2, 0, 0, |
1bbd0b84 | 1993 | (SCM str, SCM port), |
b380b885 MD |
1994 | "Place the string @var{str} in @var{port} so that its characters will be\n" |
1995 | "read in subsequent read operations. If called multiple times, the\n" | |
1996 | "unread characters will be read again in last-in first-out order. If\n" | |
1997 | "@var{port} is not supplied, the current-input-port is used.") | |
1bbd0b84 | 1998 | #define FUNC_NAME s_scm_unread_string |
ee1e7e13 | 1999 | { |
889975e5 | 2000 | int n; |
34d19ef6 | 2001 | SCM_VALIDATE_STRING (1, str); |
ee1e7e13 | 2002 | if (SCM_UNBNDP (port)) |
9de87eea | 2003 | port = scm_current_input_port (); |
b2456dd4 | 2004 | SCM_VALIDATE_OPINPORT (2, port); |
ee1e7e13 | 2005 | |
889975e5 MG |
2006 | n = scm_i_string_length (str); |
2007 | ||
2008 | while (n--) | |
c932ce0b | 2009 | scm_ungetc_unlocked (scm_i_string_ref (str, n), port); |
ee1e7e13 MD |
2010 | |
2011 | return str; | |
2012 | } | |
1bbd0b84 | 2013 | #undef FUNC_NAME |
ee1e7e13 | 2014 | |
840ae05d | 2015 | |
19b8d12b | 2016 | \f |
23f2b9a3 | 2017 | |
19b8d12b | 2018 | /* Manipulating the buffers. */ |
840ae05d | 2019 | |
4251ae2e AW |
2020 | /* This routine does not take any locks, as it is usually called as part |
2021 | of a port implementation. */ | |
19b8d12b AW |
2022 | void |
2023 | scm_port_non_buffer (scm_t_port *pt) | |
2024 | { | |
2025 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; | |
2026 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
2027 | pt->read_buf_size = pt->write_buf_size = 1; | |
2028 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
840ae05d | 2029 | } |
8ab3d8a0 | 2030 | |
19b8d12b AW |
2031 | /* this should only be called when the read buffer is empty. it |
2032 | tries to refill the read buffer. it returns the first char from | |
2033 | the port, which is either EOF or *(pt->read_pos). */ | |
2034 | int | |
4251ae2e | 2035 | scm_fill_input_unlocked (SCM port) |
82893676 | 2036 | { |
19b8d12b | 2037 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
8ab3d8a0 | 2038 | |
19b8d12b | 2039 | assert (pt->read_pos == pt->read_end); |
8ab3d8a0 | 2040 | |
19b8d12b | 2041 | if (pt->read_buf == pt->putback_buf) |
82893676 | 2042 | { |
19b8d12b AW |
2043 | /* finished reading put-back chars. */ |
2044 | pt->read_buf = pt->saved_read_buf; | |
2045 | pt->read_pos = pt->saved_read_pos; | |
2046 | pt->read_end = pt->saved_read_end; | |
2047 | pt->read_buf_size = pt->saved_read_buf_size; | |
2048 | if (pt->read_pos < pt->read_end) | |
2049 | return *(pt->read_pos); | |
82893676 | 2050 | } |
19b8d12b | 2051 | return SCM_PORT_DESCRIPTOR (port)->fill_input (port); |
82893676 | 2052 | } |
82893676 | 2053 | |
4251ae2e AW |
2054 | int |
2055 | scm_fill_input (SCM port) | |
2056 | { | |
92c0ebac | 2057 | scm_i_pthread_mutex_t *lock; |
4251ae2e AW |
2058 | int ret; |
2059 | ||
92c0ebac | 2060 | scm_c_lock_port (port, &lock); |
4251ae2e | 2061 | ret = scm_fill_input_unlocked (port); |
92c0ebac AW |
2062 | if (lock) |
2063 | scm_i_pthread_mutex_unlock (lock); | |
2064 | ||
4251ae2e AW |
2065 | |
2066 | return ret; | |
2067 | } | |
2068 | ||
19b8d12b AW |
2069 | /* move up to read_len chars from port's putback and/or read buffers |
2070 | into memory starting at dest. returns the number of chars moved. */ | |
2071 | size_t | |
2072 | scm_take_from_input_buffers (SCM port, char *dest, size_t read_len) | |
840ae05d | 2073 | { |
19b8d12b AW |
2074 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
2075 | size_t chars_read = 0; | |
2076 | size_t from_buf = min (pt->read_end - pt->read_pos, read_len); | |
840ae05d | 2077 | |
19b8d12b | 2078 | if (from_buf > 0) |
840ae05d | 2079 | { |
19b8d12b AW |
2080 | memcpy (dest, pt->read_pos, from_buf); |
2081 | pt->read_pos += from_buf; | |
2082 | chars_read += from_buf; | |
2083 | read_len -= from_buf; | |
2084 | dest += from_buf; | |
840ae05d | 2085 | } |
3fe6190f | 2086 | |
19b8d12b AW |
2087 | /* if putback was active, try the real input buffer too. */ |
2088 | if (pt->read_buf == pt->putback_buf) | |
69bc9ff3 | 2089 | { |
19b8d12b AW |
2090 | from_buf = min (pt->saved_read_end - pt->saved_read_pos, read_len); |
2091 | if (from_buf > 0) | |
2092 | { | |
2093 | memcpy (dest, pt->saved_read_pos, from_buf); | |
2094 | pt->saved_read_pos += from_buf; | |
2095 | chars_read += from_buf; | |
2096 | } | |
69bc9ff3 | 2097 | } |
19b8d12b | 2098 | return chars_read; |
840ae05d JB |
2099 | } |
2100 | ||
19b8d12b AW |
2101 | /* Clear a port's read buffers, returning the contents. */ |
2102 | SCM_DEFINE (scm_drain_input, "drain-input", 1, 0, 0, | |
1bbd0b84 | 2103 | (SCM port), |
19b8d12b AW |
2104 | "This procedure clears a port's input buffers, similar\n" |
2105 | "to the way that force-output clears the output buffer. The\n" | |
2106 | "contents of the buffers are returned as a single string, e.g.,\n" | |
a150979d | 2107 | "\n" |
19b8d12b AW |
2108 | "@lisp\n" |
2109 | "(define p (open-input-file ...))\n" | |
2110 | "(drain-input p) => empty string, nothing buffered yet.\n" | |
2111 | "(unread-char (read-char p) p)\n" | |
2112 | "(drain-input p) => initial chars from p, up to the buffer size.\n" | |
2113 | "@end lisp\n\n" | |
2114 | "Draining the buffers may be useful for cleanly finishing\n" | |
2115 | "buffered I/O so that the file descriptor can be used directly\n" | |
2116 | "for further input.") | |
2117 | #define FUNC_NAME s_scm_drain_input | |
0f2d19dd | 2118 | { |
19b8d12b AW |
2119 | SCM result; |
2120 | char *data; | |
2121 | scm_t_port *pt; | |
2122 | long count; | |
0f2d19dd | 2123 | |
19b8d12b AW |
2124 | SCM_VALIDATE_OPINPORT (1, port); |
2125 | pt = SCM_PTAB_ENTRY (port); | |
2126 | ||
2127 | count = pt->read_end - pt->read_pos; | |
2128 | if (pt->read_buf == pt->putback_buf) | |
2129 | count += pt->saved_read_end - pt->saved_read_pos; | |
2130 | ||
2131 | if (count) | |
2132 | { | |
2133 | result = scm_i_make_string (count, &data, 0); | |
2134 | scm_take_from_input_buffers (port, data, count); | |
2135 | } | |
2136 | else | |
2137 | result = scm_nullstr; | |
2138 | ||
2139 | return result; | |
d043d8c2 | 2140 | } |
1bbd0b84 | 2141 | #undef FUNC_NAME |
d043d8c2 | 2142 | |
19b8d12b | 2143 | void |
4251ae2e | 2144 | scm_end_input_unlocked (SCM port) |
0f2d19dd | 2145 | { |
19b8d12b AW |
2146 | long offset; |
2147 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
2148 | ||
2149 | if (pt->read_buf == pt->putback_buf) | |
2150 | { | |
2151 | offset = pt->read_end - pt->read_pos; | |
2152 | pt->read_buf = pt->saved_read_buf; | |
2153 | pt->read_pos = pt->saved_read_pos; | |
2154 | pt->read_end = pt->saved_read_end; | |
2155 | pt->read_buf_size = pt->saved_read_buf_size; | |
2156 | } | |
2157 | else | |
2158 | offset = 0; | |
2159 | ||
2160 | SCM_PORT_DESCRIPTOR (port)->end_input (port, offset); | |
0f2d19dd JB |
2161 | } |
2162 | ||
4251ae2e AW |
2163 | void |
2164 | scm_end_input (SCM port) | |
2165 | { | |
92c0ebac AW |
2166 | scm_i_pthread_mutex_t *lock; |
2167 | scm_c_lock_port (port, &lock); | |
4251ae2e | 2168 | scm_end_input_unlocked (port); |
92c0ebac AW |
2169 | if (lock) |
2170 | scm_i_pthread_mutex_unlock (lock); | |
2171 | ||
4251ae2e AW |
2172 | } |
2173 | ||
19b8d12b AW |
2174 | SCM_DEFINE (scm_force_output, "force-output", 0, 1, 0, |
2175 | (SCM port), | |
2176 | "Flush the specified output port, or the current output port if @var{port}\n" | |
2177 | "is omitted. The current output buffer contents are passed to the\n" | |
2178 | "underlying port implementation (e.g., in the case of fports, the\n" | |
2179 | "data will be written to the file and the output buffer will be cleared.)\n" | |
2180 | "It has no effect on an unbuffered port.\n\n" | |
2181 | "The return value is unspecified.") | |
2182 | #define FUNC_NAME s_scm_force_output | |
d043d8c2 | 2183 | { |
19b8d12b AW |
2184 | if (SCM_UNBNDP (port)) |
2185 | port = scm_current_output_port (); | |
2186 | else | |
2187 | { | |
2188 | port = SCM_COERCE_OUTPORT (port); | |
2189 | SCM_VALIDATE_OPOUTPORT (1, port); | |
2190 | } | |
4251ae2e | 2191 | scm_flush_unlocked (port); |
564478fd | 2192 | return SCM_UNSPECIFIED; |
d043d8c2 | 2193 | } |
1bbd0b84 | 2194 | #undef FUNC_NAME |
d043d8c2 | 2195 | |
19b8d12b | 2196 | void |
4251ae2e | 2197 | scm_flush_unlocked (SCM port) |
0f2d19dd | 2198 | { |
19b8d12b | 2199 | SCM_PORT_DESCRIPTOR (port)->flush (port); |
0f2d19dd JB |
2200 | } |
2201 | ||
4251ae2e AW |
2202 | void |
2203 | scm_flush (SCM port) | |
2204 | { | |
92c0ebac AW |
2205 | scm_i_pthread_mutex_t *lock; |
2206 | scm_c_lock_port (port, &lock); | |
4251ae2e | 2207 | scm_flush_unlocked (port); |
92c0ebac AW |
2208 | if (lock) |
2209 | scm_i_pthread_mutex_unlock (lock); | |
2210 | ||
4251ae2e AW |
2211 | } |
2212 | ||
d14af9f2 | 2213 | |
19b8d12b | 2214 | \f |
d6a6989e | 2215 | |
19b8d12b | 2216 | /* Output. */ |
889975e5 | 2217 | |
0607ebbf AW |
2218 | void |
2219 | scm_putc (char c, SCM port) | |
2220 | { | |
92c0ebac AW |
2221 | scm_i_pthread_mutex_t *lock; |
2222 | scm_c_lock_port (port, &lock); | |
0607ebbf | 2223 | scm_putc_unlocked (c, port); |
92c0ebac AW |
2224 | if (lock) |
2225 | scm_i_pthread_mutex_unlock (lock); | |
2226 | ||
0607ebbf AW |
2227 | } |
2228 | ||
2229 | void | |
2230 | scm_puts (const char *s, SCM port) | |
2231 | { | |
92c0ebac AW |
2232 | scm_i_pthread_mutex_t *lock; |
2233 | scm_c_lock_port (port, &lock); | |
0607ebbf | 2234 | scm_puts_unlocked (s, port); |
92c0ebac AW |
2235 | if (lock) |
2236 | scm_i_pthread_mutex_unlock (lock); | |
2237 | ||
0607ebbf AW |
2238 | } |
2239 | ||
19b8d12b AW |
2240 | /* scm_c_write |
2241 | * | |
2242 | * Used by an application to write arbitrary number of bytes to an SCM | |
2243 | * port. Similar semantics as libc write. However, unlike libc | |
2244 | * write, scm_c_write writes the requested number of bytes and has no | |
2245 | * return value. | |
2246 | * | |
2247 | * Warning: Doesn't update port line and column counts! | |
2248 | */ | |
9d9c66ba | 2249 | void |
f209aeee | 2250 | scm_c_write_unlocked (SCM port, const void *ptr, size_t size) |
19b8d12b | 2251 | #define FUNC_NAME "scm_c_write" |
9d9c66ba | 2252 | { |
19b8d12b AW |
2253 | scm_t_port *pt; |
2254 | scm_t_ptob_descriptor *ptob; | |
9d9c66ba | 2255 | |
19b8d12b | 2256 | SCM_VALIDATE_OPOUTPORT (1, port); |
9d9c66ba | 2257 | |
19b8d12b AW |
2258 | pt = SCM_PTAB_ENTRY (port); |
2259 | ptob = SCM_PORT_DESCRIPTOR (port); | |
9d9c66ba | 2260 | |
19b8d12b | 2261 | if (pt->rw_active == SCM_PORT_READ) |
4251ae2e | 2262 | scm_end_input_unlocked (port); |
19b8d12b AW |
2263 | |
2264 | ptob->write (port, ptr, size); | |
2265 | ||
2266 | if (pt->rw_random) | |
2267 | pt->rw_active = SCM_PORT_WRITE; | |
889975e5 | 2268 | } |
19b8d12b | 2269 | #undef FUNC_NAME |
889975e5 | 2270 | |
f209aeee AW |
2271 | void |
2272 | scm_c_write (SCM port, const void *ptr, size_t size) | |
2273 | { | |
92c0ebac AW |
2274 | scm_i_pthread_mutex_t *lock; |
2275 | scm_c_lock_port (port, &lock); | |
f209aeee | 2276 | scm_c_write_unlocked (port, ptr, size); |
92c0ebac AW |
2277 | if (lock) |
2278 | scm_i_pthread_mutex_unlock (lock); | |
2279 | ||
f209aeee AW |
2280 | } |
2281 | ||
19b8d12b AW |
2282 | /* scm_lfwrite |
2283 | * | |
2284 | * This function differs from scm_c_write; it updates port line and | |
2285 | * column. */ | |
889975e5 | 2286 | void |
f209aeee | 2287 | scm_lfwrite_unlocked (const char *ptr, size_t size, SCM port) |
889975e5 | 2288 | { |
19b8d12b AW |
2289 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
2290 | scm_t_ptob_descriptor *ptob = SCM_PORT_DESCRIPTOR (port); | |
f4bc4e59 | 2291 | |
19b8d12b | 2292 | if (pt->rw_active == SCM_PORT_READ) |
4251ae2e | 2293 | scm_end_input_unlocked (port); |
f4bc4e59 | 2294 | |
19b8d12b | 2295 | ptob->write (port, ptr, size); |
f4bc4e59 | 2296 | |
19b8d12b AW |
2297 | for (; size; ptr++, size--) |
2298 | update_port_lf ((scm_t_wchar) (unsigned char) *ptr, port); | |
d9544bf0 | 2299 | |
19b8d12b AW |
2300 | if (pt->rw_random) |
2301 | pt->rw_active = SCM_PORT_WRITE; | |
2302 | } | |
f4bc4e59 | 2303 | |
f209aeee AW |
2304 | void |
2305 | scm_lfwrite (const char *ptr, size_t size, SCM port) | |
2306 | { | |
92c0ebac AW |
2307 | scm_i_pthread_mutex_t *lock; |
2308 | scm_c_lock_port (port, &lock); | |
f209aeee | 2309 | scm_lfwrite_unlocked (ptr, size, port); |
92c0ebac AW |
2310 | if (lock) |
2311 | scm_i_pthread_mutex_unlock (lock); | |
2312 | ||
f209aeee AW |
2313 | } |
2314 | ||
19b8d12b AW |
2315 | /* Write STR to PORT from START inclusive to END exclusive. */ |
2316 | void | |
2317 | scm_lfwrite_substr (SCM str, size_t start, size_t end, SCM port) | |
2318 | { | |
2319 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
f4bc4e59 | 2320 | |
19b8d12b | 2321 | if (pt->rw_active == SCM_PORT_READ) |
4251ae2e | 2322 | scm_end_input_unlocked (port); |
f4bc4e59 | 2323 | |
19b8d12b AW |
2324 | if (end == (size_t) -1) |
2325 | end = scm_i_string_length (str); | |
f4bc4e59 | 2326 | |
19b8d12b | 2327 | scm_display (scm_c_substring (str, start, end), port); |
f4bc4e59 | 2328 | |
19b8d12b AW |
2329 | if (pt->rw_random) |
2330 | pt->rw_active = SCM_PORT_WRITE; | |
889975e5 MG |
2331 | } |
2332 | ||
19b8d12b AW |
2333 | |
2334 | \f | |
2335 | ||
2336 | /* Querying and setting positions, and character availability. */ | |
2337 | ||
2338 | SCM_DEFINE (scm_char_ready_p, "char-ready?", 0, 1, 0, | |
889975e5 | 2339 | (SCM port), |
19b8d12b AW |
2340 | "Return @code{#t} if a character is ready on input @var{port}\n" |
2341 | "and return @code{#f} otherwise. If @code{char-ready?} returns\n" | |
2342 | "@code{#t} then the next @code{read-char} operation on\n" | |
2343 | "@var{port} is guaranteed not to hang. If @var{port} is a file\n" | |
2344 | "port at end of file then @code{char-ready?} returns @code{#t}.\n" | |
2345 | "\n" | |
2346 | "@code{char-ready?} exists to make it possible for a\n" | |
2347 | "program to accept characters from interactive ports without\n" | |
2348 | "getting stuck waiting for input. Any input editors associated\n" | |
2349 | "with such ports must make sure that characters whose existence\n" | |
2350 | "has been asserted by @code{char-ready?} cannot be rubbed out.\n" | |
2351 | "If @code{char-ready?} were to return @code{#f} at end of file,\n" | |
2352 | "a port at end of file would be indistinguishable from an\n" | |
2353 | "interactive port that has no ready characters.") | |
2354 | #define FUNC_NAME s_scm_char_ready_p | |
889975e5 MG |
2355 | { |
2356 | scm_t_port *pt; | |
889975e5 | 2357 | |
19b8d12b AW |
2358 | if (SCM_UNBNDP (port)) |
2359 | port = scm_current_input_port (); | |
2360 | /* It's possible to close the current input port, so validate even in | |
2361 | this case. */ | |
2362 | SCM_VALIDATE_OPINPORT (1, port); | |
889975e5 MG |
2363 | |
2364 | pt = SCM_PTAB_ENTRY (port); | |
19b8d12b AW |
2365 | |
2366 | /* if the current read buffer is filled, or the | |
2367 | last pushed-back char has been read and the saved buffer is | |
2368 | filled, result is true. */ | |
2369 | if (pt->read_pos < pt->read_end | |
2370 | || (pt->read_buf == pt->putback_buf | |
2371 | && pt->saved_read_pos < pt->saved_read_end)) | |
2372 | return SCM_BOOL_T; | |
889975e5 | 2373 | else |
19b8d12b AW |
2374 | { |
2375 | scm_t_ptob_descriptor *ptob = SCM_PORT_DESCRIPTOR (port); | |
2376 | ||
2377 | if (ptob->input_waiting) | |
2378 | return scm_from_bool(ptob->input_waiting (port)); | |
2379 | else | |
2380 | return SCM_BOOL_T; | |
2381 | } | |
889975e5 MG |
2382 | } |
2383 | #undef FUNC_NAME | |
d6a6989e | 2384 | |
19b8d12b AW |
2385 | SCM_DEFINE (scm_seek, "seek", 3, 0, 0, |
2386 | (SCM fd_port, SCM offset, SCM whence), | |
0858753e | 2387 | "Sets the current position of @var{fd_port} to the integer\n" |
19b8d12b AW |
2388 | "@var{offset}, which is interpreted according to the value of\n" |
2389 | "@var{whence}.\n" | |
2390 | "\n" | |
2391 | "One of the following variables should be supplied for\n" | |
2392 | "@var{whence}:\n" | |
2393 | "@defvar SEEK_SET\n" | |
2394 | "Seek from the beginning of the file.\n" | |
2395 | "@end defvar\n" | |
2396 | "@defvar SEEK_CUR\n" | |
2397 | "Seek from the current position.\n" | |
2398 | "@end defvar\n" | |
2399 | "@defvar SEEK_END\n" | |
2400 | "Seek from the end of the file.\n" | |
2401 | "@end defvar\n" | |
0858753e | 2402 | "If @var{fd_port} is a file descriptor, the underlying system\n" |
19b8d12b AW |
2403 | "call is @code{lseek}. @var{port} may be a string port.\n" |
2404 | "\n" | |
2405 | "The value returned is the new position in the file. This means\n" | |
2406 | "that the current position of a port can be obtained using:\n" | |
2407 | "@lisp\n" | |
2408 | "(seek port 0 SEEK_CUR)\n" | |
2409 | "@end lisp") | |
2410 | #define FUNC_NAME s_scm_seek | |
889975e5 | 2411 | { |
19b8d12b | 2412 | int how; |
889975e5 | 2413 | |
19b8d12b | 2414 | fd_port = SCM_COERCE_OUTPORT (fd_port); |
889975e5 | 2415 | |
19b8d12b AW |
2416 | how = scm_to_int (whence); |
2417 | if (how != SEEK_SET && how != SEEK_CUR && how != SEEK_END) | |
2418 | SCM_OUT_OF_RANGE (3, whence); | |
da288f50 | 2419 | |
19b8d12b AW |
2420 | if (SCM_OPPORTP (fd_port)) |
2421 | { | |
2422 | scm_t_ptob_descriptor *ptob = SCM_PORT_DESCRIPTOR (fd_port); | |
2423 | off_t_or_off64_t off = scm_to_off_t_or_off64_t (offset); | |
2424 | off_t_or_off64_t rv; | |
2425 | ||
2426 | if (!ptob->seek) | |
2427 | SCM_MISC_ERROR ("port is not seekable", | |
2428 | scm_cons (fd_port, SCM_EOL)); | |
2429 | else | |
2430 | rv = ptob->seek (fd_port, off, how); | |
2431 | return scm_from_off_t_or_off64_t (rv); | |
2432 | } | |
2433 | else /* file descriptor?. */ | |
2434 | { | |
2435 | off_t_or_off64_t off = scm_to_off_t_or_off64_t (offset); | |
2436 | off_t_or_off64_t rv; | |
2437 | rv = lseek_or_lseek64 (scm_to_int (fd_port), off, how); | |
2438 | if (rv == -1) | |
2439 | SCM_SYSERROR; | |
2440 | return scm_from_off_t_or_off64_t (rv); | |
2441 | } | |
889975e5 MG |
2442 | } |
2443 | #undef FUNC_NAME | |
2444 | ||
19b8d12b AW |
2445 | #ifndef O_BINARY |
2446 | #define O_BINARY 0 | |
2447 | #endif | |
889975e5 | 2448 | |
19b8d12b AW |
2449 | /* Mingw has ftruncate(), perhaps implemented above using chsize, but |
2450 | doesn't have the filename version truncate(), hence this code. */ | |
2451 | #if HAVE_FTRUNCATE && ! HAVE_TRUNCATE | |
2452 | static int | |
2453 | truncate (const char *file, off_t length) | |
889975e5 | 2454 | { |
19b8d12b AW |
2455 | int ret, fdes; |
2456 | ||
2457 | fdes = open (file, O_BINARY | O_WRONLY); | |
2458 | if (fdes == -1) | |
2459 | return -1; | |
2460 | ||
2461 | ret = ftruncate (fdes, length); | |
2462 | if (ret == -1) | |
889975e5 | 2463 | { |
19b8d12b AW |
2464 | int save_errno = errno; |
2465 | close (fdes); | |
2466 | errno = save_errno; | |
2467 | return -1; | |
889975e5 | 2468 | } |
19b8d12b AW |
2469 | |
2470 | return close (fdes); | |
889975e5 | 2471 | } |
19b8d12b | 2472 | #endif /* HAVE_FTRUNCATE && ! HAVE_TRUNCATE */ |
889975e5 | 2473 | |
19b8d12b AW |
2474 | SCM_DEFINE (scm_truncate_file, "truncate-file", 1, 1, 0, |
2475 | (SCM object, SCM length), | |
0858753e AW |
2476 | "Truncate file @var{object} to @var{length} bytes. @var{object}\n" |
2477 | "can be a filename string, a port object, or an integer file\n" | |
2478 | "descriptor.\n" | |
19b8d12b AW |
2479 | "The return value is unspecified.\n" |
2480 | "\n" | |
2481 | "For a port or file descriptor @var{length} can be omitted, in\n" | |
2482 | "which case the file is truncated at the current position (per\n" | |
2483 | "@code{ftell} above).\n" | |
2484 | "\n" | |
2485 | "On most systems a file can be extended by giving a length\n" | |
2486 | "greater than the current size, but this is not mandatory in the\n" | |
2487 | "POSIX standard.") | |
2488 | #define FUNC_NAME s_scm_truncate_file | |
889975e5 | 2489 | { |
19b8d12b AW |
2490 | int rv; |
2491 | ||
2492 | /* "object" can be a port, fdes or filename. | |
2493 | ||
2494 | Negative "length" makes no sense, but it's left to truncate() or | |
2495 | ftruncate() to give back an error for that (normally EINVAL). | |
2496 | */ | |
2497 | ||
2498 | if (SCM_UNBNDP (length)) | |
889975e5 | 2499 | { |
19b8d12b AW |
2500 | /* must supply length if object is a filename. */ |
2501 | if (scm_is_string (object)) | |
2502 | SCM_MISC_ERROR("must supply length if OBJECT is a filename", SCM_EOL); | |
2503 | ||
2504 | length = scm_seek (object, SCM_INUM0, scm_from_int (SEEK_CUR)); | |
2505 | } | |
2506 | ||
2507 | object = SCM_COERCE_OUTPORT (object); | |
2508 | if (scm_is_integer (object)) | |
2509 | { | |
2510 | off_t_or_off64_t c_length = scm_to_off_t_or_off64_t (length); | |
2511 | SCM_SYSCALL (rv = ftruncate_or_ftruncate64 (scm_to_int (object), | |
2512 | c_length)); | |
2513 | } | |
2514 | else if (SCM_OPOUTPORTP (object)) | |
2515 | { | |
2516 | off_t_or_off64_t c_length = scm_to_off_t_or_off64_t (length); | |
2517 | scm_t_port *pt = SCM_PTAB_ENTRY (object); | |
2518 | scm_t_ptob_descriptor *ptob = SCM_PORT_DESCRIPTOR (object); | |
2519 | ||
2520 | if (!ptob->truncate) | |
2521 | SCM_MISC_ERROR ("port is not truncatable", SCM_EOL); | |
2522 | if (pt->rw_active == SCM_PORT_READ) | |
4251ae2e | 2523 | scm_end_input_unlocked (object); |
19b8d12b AW |
2524 | else if (pt->rw_active == SCM_PORT_WRITE) |
2525 | ptob->flush (object); | |
2526 | ||
2527 | ptob->truncate (object, c_length); | |
2528 | rv = 0; | |
889975e5 MG |
2529 | } |
2530 | else | |
2531 | { | |
19b8d12b AW |
2532 | off_t_or_off64_t c_length = scm_to_off_t_or_off64_t (length); |
2533 | char *str = scm_to_locale_string (object); | |
2534 | int eno; | |
2535 | SCM_SYSCALL (rv = truncate_or_truncate64 (str, c_length)); | |
2536 | eno = errno; | |
2537 | free (str); | |
2538 | errno = eno; | |
889975e5 | 2539 | } |
19b8d12b AW |
2540 | if (rv == -1) |
2541 | SCM_SYSERROR; | |
2542 | return SCM_UNSPECIFIED; | |
889975e5 | 2543 | } |
19b8d12b | 2544 | #undef FUNC_NAME |
889975e5 | 2545 | |
19b8d12b AW |
2546 | SCM_DEFINE (scm_port_line, "port-line", 1, 0, 0, |
2547 | (SCM port), | |
2548 | "Return the current line number for @var{port}.\n" | |
889975e5 | 2549 | "\n" |
19b8d12b AW |
2550 | "The first line of a file is 0. But you might want to add 1\n" |
2551 | "when printing line numbers, since starting from 1 is\n" | |
2552 | "traditional in error messages, and likely to be more natural to\n" | |
2553 | "non-programmers.") | |
2554 | #define FUNC_NAME s_scm_port_line | |
889975e5 | 2555 | { |
19b8d12b AW |
2556 | port = SCM_COERCE_OUTPORT (port); |
2557 | SCM_VALIDATE_OPENPORT (1, port); | |
2558 | return scm_from_long (SCM_LINUM (port)); | |
889975e5 MG |
2559 | } |
2560 | #undef FUNC_NAME | |
2561 | ||
19b8d12b AW |
2562 | SCM_DEFINE (scm_set_port_line_x, "set-port-line!", 2, 0, 0, |
2563 | (SCM port, SCM line), | |
2564 | "Set the current line number for @var{port} to @var{line}. The\n" | |
2565 | "first line of a file is 0.") | |
2566 | #define FUNC_NAME s_scm_set_port_line_x | |
889975e5 | 2567 | { |
19b8d12b AW |
2568 | port = SCM_COERCE_OUTPORT (port); |
2569 | SCM_VALIDATE_OPENPORT (1, port); | |
2570 | SCM_PTAB_ENTRY (port)->line_number = scm_to_long (line); | |
2571 | return SCM_UNSPECIFIED; | |
2572 | } | |
2573 | #undef FUNC_NAME | |
889975e5 | 2574 | |
19b8d12b AW |
2575 | SCM_DEFINE (scm_port_column, "port-column", 1, 0, 0, |
2576 | (SCM port), | |
2577 | "Return the current column number of @var{port}.\n" | |
2578 | "If the number is\n" | |
2579 | "unknown, the result is #f. Otherwise, the result is a 0-origin integer\n" | |
2580 | "- i.e. the first character of the first line is line 0, column 0.\n" | |
2581 | "(However, when you display a file position, for example in an error\n" | |
2582 | "message, we recommend you add 1 to get 1-origin integers. This is\n" | |
2583 | "because lines and column numbers traditionally start with 1, and that is\n" | |
2584 | "what non-programmers will find most natural.)") | |
2585 | #define FUNC_NAME s_scm_port_column | |
2586 | { | |
2587 | port = SCM_COERCE_OUTPORT (port); | |
2588 | SCM_VALIDATE_OPENPORT (1, port); | |
2589 | return scm_from_int (SCM_COL (port)); | |
2590 | } | |
2591 | #undef FUNC_NAME | |
889975e5 | 2592 | |
19b8d12b AW |
2593 | SCM_DEFINE (scm_set_port_column_x, "set-port-column!", 2, 0, 0, |
2594 | (SCM port, SCM column), | |
2595 | "Set the current column of @var{port}. Before reading the first\n" | |
2596 | "character on a line the column should be 0.") | |
2597 | #define FUNC_NAME s_scm_set_port_column_x | |
2598 | { | |
2599 | port = SCM_COERCE_OUTPORT (port); | |
2600 | SCM_VALIDATE_OPENPORT (1, port); | |
2601 | SCM_PTAB_ENTRY (port)->column_number = scm_to_int (column); | |
2602 | return SCM_UNSPECIFIED; | |
2603 | } | |
2604 | #undef FUNC_NAME | |
889975e5 | 2605 | |
19b8d12b AW |
2606 | SCM_DEFINE (scm_port_filename, "port-filename", 1, 0, 0, |
2607 | (SCM port), | |
2608 | "Return the filename associated with @var{port}, or @code{#f}\n" | |
2609 | "if no filename is associated with the port.") | |
2610 | #define FUNC_NAME s_scm_port_filename | |
2611 | { | |
2612 | port = SCM_COERCE_OUTPORT (port); | |
2613 | SCM_VALIDATE_OPENPORT (1, port); | |
2614 | return SCM_FILENAME (port); | |
2615 | } | |
2616 | #undef FUNC_NAME | |
889975e5 | 2617 | |
19b8d12b AW |
2618 | SCM_DEFINE (scm_set_port_filename_x, "set-port-filename!", 2, 0, 0, |
2619 | (SCM port, SCM filename), | |
2620 | "Change the filename associated with @var{port}, using the current input\n" | |
2621 | "port if none is specified. Note that this does not change the port's\n" | |
2622 | "source of data, but only the value that is returned by\n" | |
2623 | "@code{port-filename} and reported in diagnostic output.") | |
2624 | #define FUNC_NAME s_scm_set_port_filename_x | |
2625 | { | |
2626 | port = SCM_COERCE_OUTPORT (port); | |
2627 | SCM_VALIDATE_OPENPORT (1, port); | |
2628 | /* We allow the user to set the filename to whatever he likes. */ | |
2629 | SCM_SET_FILENAME (port, filename); | |
889975e5 MG |
2630 | return SCM_UNSPECIFIED; |
2631 | } | |
2632 | #undef FUNC_NAME | |
2633 | ||
2634 | ||
19b8d12b AW |
2635 | \f |
2636 | ||
2637 | /* Implementation helpers for port printing functions. */ | |
889975e5 | 2638 | |
f12733c9 MD |
2639 | void |
2640 | scm_print_port_mode (SCM exp, SCM port) | |
2641 | { | |
0607ebbf | 2642 | scm_puts_unlocked (SCM_CLOSEDP (exp) |
f12733c9 | 2643 | ? "closed: " |
f9a64404 DH |
2644 | : (SCM_RDNG & SCM_CELL_WORD_0 (exp) |
2645 | ? (SCM_WRTNG & SCM_CELL_WORD_0 (exp) | |
f12733c9 MD |
2646 | ? "input-output: " |
2647 | : "input: ") | |
f9a64404 | 2648 | : (SCM_WRTNG & SCM_CELL_WORD_0 (exp) |
f12733c9 MD |
2649 | ? "output: " |
2650 | : "bogus: ")), | |
2651 | port); | |
2652 | } | |
1cc91f1b | 2653 | |
f12733c9 | 2654 | int |
e81d98ec | 2655 | scm_port_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) |
0f2d19dd | 2656 | { |
f12733c9 MD |
2657 | char *type = SCM_PTOBNAME (SCM_PTOBNUM (exp)); |
2658 | if (!type) | |
2659 | type = "port"; | |
0607ebbf | 2660 | scm_puts_unlocked ("#<", port); |
f12733c9 | 2661 | scm_print_port_mode (exp, port); |
0607ebbf AW |
2662 | scm_puts_unlocked (type, port); |
2663 | scm_putc_unlocked (' ', port); | |
0345e278 | 2664 | scm_uintprint (SCM_CELL_WORD_1 (exp), 16, port); |
0607ebbf | 2665 | scm_putc_unlocked ('>', port); |
f12733c9 | 2666 | return 1; |
0f2d19dd JB |
2667 | } |
2668 | ||
19b8d12b AW |
2669 | |
2670 | \f | |
2671 | ||
2672 | /* Iterating over all ports. */ | |
2673 | ||
2674 | struct for_each_data | |
2675 | { | |
2676 | void (*proc) (void *data, SCM p); | |
2677 | void *data; | |
2678 | }; | |
2679 | ||
2680 | static SCM | |
2681 | for_each_trampoline (void *data, SCM port, SCM result) | |
2682 | { | |
2683 | struct for_each_data *d = data; | |
2684 | ||
2685 | d->proc (d->data, port); | |
2686 | ||
2687 | return result; | |
2688 | } | |
2689 | ||
2690 | void | |
2691 | scm_c_port_for_each (void (*proc)(void *data, SCM p), void *data) | |
2692 | { | |
2693 | struct for_each_data d; | |
2694 | ||
2695 | d.proc = proc; | |
2696 | d.data = data; | |
2697 | ||
2698 | scm_c_weak_set_fold (for_each_trampoline, &d, SCM_EOL, | |
2699 | scm_i_port_weak_set); | |
2700 | } | |
2701 | ||
2702 | static void | |
2703 | scm_for_each_trampoline (void *data, SCM port) | |
2704 | { | |
2705 | scm_call_1 (SCM_PACK_POINTER (data), port); | |
2706 | } | |
2707 | ||
2708 | SCM_DEFINE (scm_port_for_each, "port-for-each", 1, 0, 0, | |
2709 | (SCM proc), | |
2710 | "Apply @var{proc} to each port in the Guile port table\n" | |
2711 | "in turn. The return value is unspecified. More specifically,\n" | |
2712 | "@var{proc} is applied exactly once to every port that exists\n" | |
0858753e AW |
2713 | "in the system at the time @code{port-for-each} is invoked.\n" |
2714 | "Changes to the port table while @code{port-for-each} is running\n" | |
2715 | "have no effect as far as @code{port-for-each} is concerned.") | |
19b8d12b AW |
2716 | #define FUNC_NAME s_scm_port_for_each |
2717 | { | |
2718 | SCM_VALIDATE_PROC (1, proc); | |
2719 | ||
2720 | scm_c_port_for_each (scm_for_each_trampoline, SCM_UNPACK_POINTER (proc)); | |
2721 | ||
2722 | return SCM_UNSPECIFIED; | |
2723 | } | |
2724 | #undef FUNC_NAME | |
2725 | ||
2726 | static void | |
2727 | flush_output_port (void *closure, SCM port) | |
2728 | { | |
2729 | if (SCM_OPOUTPORTP (port)) | |
4251ae2e | 2730 | scm_flush_unlocked (port); |
19b8d12b AW |
2731 | } |
2732 | ||
2733 | SCM_DEFINE (scm_flush_all_ports, "flush-all-ports", 0, 0, 0, | |
2734 | (), | |
2735 | "Equivalent to calling @code{force-output} on\n" | |
2736 | "all open output ports. The return value is unspecified.") | |
2737 | #define FUNC_NAME s_scm_flush_all_ports | |
2738 | { | |
2739 | scm_c_port_for_each (&flush_output_port, NULL); | |
2740 | return SCM_UNSPECIFIED; | |
2741 | } | |
2742 | #undef FUNC_NAME | |
2743 | ||
2744 | ||
0f2d19dd | 2745 | \f |
ee149d03 | 2746 | |
d68fee48 | 2747 | /* Void ports. */ |
0f2d19dd | 2748 | |
92c2555f | 2749 | scm_t_bits scm_tc16_void_port = 0; |
0f2d19dd | 2750 | |
e81d98ec | 2751 | static int fill_input_void_port (SCM port SCM_UNUSED) |
283a1a0e | 2752 | { |
70df8af6 | 2753 | return EOF; |
283a1a0e GH |
2754 | } |
2755 | ||
31703ab8 | 2756 | static void |
e81d98ec DH |
2757 | write_void_port (SCM port SCM_UNUSED, |
2758 | const void *data SCM_UNUSED, | |
2759 | size_t size SCM_UNUSED) | |
31703ab8 GH |
2760 | { |
2761 | } | |
2762 | ||
d617ee18 MV |
2763 | static SCM |
2764 | scm_i_void_port (long mode_bits) | |
0f2d19dd | 2765 | { |
2721f918 AW |
2766 | SCM ret; |
2767 | ||
2768 | ret = scm_c_make_port (scm_tc16_void_port, mode_bits, 0); | |
da220f27 | 2769 | |
2721f918 | 2770 | scm_port_non_buffer (SCM_PTAB_ENTRY (ret)); |
402788a9 | 2771 | |
2721f918 | 2772 | return ret; |
0f2d19dd JB |
2773 | } |
2774 | ||
d617ee18 MV |
2775 | SCM |
2776 | scm_void_port (char *mode_str) | |
2777 | { | |
2778 | return scm_i_void_port (scm_mode_bits (mode_str)); | |
2779 | } | |
2780 | ||
a1ec6916 | 2781 | SCM_DEFINE (scm_sys_make_void_port, "%make-void-port", 1, 0, 0, |
1bbd0b84 | 2782 | (SCM mode), |
70df8af6 | 2783 | "Create and return a new void port. A void port acts like\n" |
bb2c02f2 | 2784 | "@file{/dev/null}. The @var{mode} argument\n" |
70df8af6 | 2785 | "specifies the input/output modes for this port: see the\n" |
b380b885 | 2786 | "documentation for @code{open-file} in @ref{File Ports}.") |
1bbd0b84 | 2787 | #define FUNC_NAME s_scm_sys_make_void_port |
0f2d19dd | 2788 | { |
d617ee18 | 2789 | return scm_i_void_port (scm_i_mode_bits (mode)); |
0f2d19dd | 2790 | } |
1bbd0b84 | 2791 | #undef FUNC_NAME |
0f2d19dd | 2792 | |
19b8d12b | 2793 | |
0f2d19dd | 2794 | \f |
19b8d12b | 2795 | |
89545eba | 2796 | /* Initialization. */ |
1cc91f1b | 2797 | |
0f2d19dd JB |
2798 | void |
2799 | scm_init_ports () | |
0f2d19dd | 2800 | { |
840ae05d | 2801 | /* lseek() symbols. */ |
e11e83f3 MV |
2802 | scm_c_define ("SEEK_SET", scm_from_int (SEEK_SET)); |
2803 | scm_c_define ("SEEK_CUR", scm_from_int (SEEK_CUR)); | |
2804 | scm_c_define ("SEEK_END", scm_from_int (SEEK_END)); | |
840ae05d | 2805 | |
70df8af6 GH |
2806 | scm_tc16_void_port = scm_make_port_type ("void", fill_input_void_port, |
2807 | write_void_port); | |
9de87eea | 2808 | |
f39448c5 AW |
2809 | cur_inport_fluid = scm_make_fluid (); |
2810 | cur_outport_fluid = scm_make_fluid (); | |
2811 | cur_errport_fluid = scm_make_fluid (); | |
2812 | cur_loadport_fluid = scm_make_fluid (); | |
9de87eea | 2813 | |
2721f918 | 2814 | scm_i_port_weak_set = scm_c_make_weak_set (31); |
d6a6989e | 2815 | |
a0599745 | 2816 | #include "libguile/ports.x" |
889975e5 | 2817 | |
d6a6989e | 2818 | /* Use Latin-1 as the default port encoding. */ |
c81c2ad3 AW |
2819 | SCM_VARIABLE_SET (default_port_encoding_var, |
2820 | scm_make_fluid_with_default (SCM_BOOL_F)); | |
889975e5 | 2821 | scm_port_encoding_init = 1; |
d6a6989e | 2822 | |
c81c2ad3 AW |
2823 | SCM_VARIABLE_SET (scm_conversion_strategy, |
2824 | scm_make_fluid_with_default | |
2825 | (scm_from_int ((int) SCM_FAILED_CONVERSION_QUESTION_MARK))); | |
889975e5 MG |
2826 | scm_conversion_strategy_init = 1; |
2827 | ||
9670f238 AW |
2828 | /* These bindings are used when boot-9 turns `current-input-port' et |
2829 | al into parameters. They are then removed from the guile module. */ | |
2830 | scm_c_define ("%current-input-port-fluid", cur_inport_fluid); | |
2831 | scm_c_define ("%current-output-port-fluid", cur_outport_fluid); | |
2832 | scm_c_define ("%current-error-port-fluid", cur_errport_fluid); | |
0f2d19dd | 2833 | } |
89e00824 ML |
2834 | |
2835 | /* | |
2836 | Local Variables: | |
2837 | c-file-style: "gnu" | |
2838 | End: | |
2839 | */ |