Commit | Line | Data |
---|---|---|
f4bc4e59 LC |
1 | /* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, |
2 | * 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. | |
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; | |
106 | ||
107 | long | |
108 | scm_c_num_port_types (void) | |
109 | { | |
110 | long ret; | |
111 | ||
112 | scm_i_pthread_mutex_lock (&scm_ptobs_lock); | |
113 | ret = scm_numptob; | |
114 | scm_i_pthread_mutex_unlock (&scm_ptobs_lock); | |
115 | ||
116 | return ret; | |
117 | } | |
118 | ||
119 | scm_t_ptob_descriptor* | |
120 | scm_c_port_type_ref (long ptobnum) | |
121 | { | |
122 | scm_t_ptob_descriptor *ret = NULL; | |
123 | ||
124 | scm_i_pthread_mutex_lock (&scm_ptobs_lock); | |
125 | ||
126 | if (0 <= ptobnum && ptobnum < scm_numptob) | |
127 | ret = scm_ptobs[ptobnum]; | |
128 | ||
129 | scm_i_pthread_mutex_unlock (&scm_ptobs_lock); | |
130 | ||
131 | if (!ret) | |
132 | scm_out_of_range ("scm_c_port_type_ref", scm_from_long (ptobnum)); | |
133 | ||
134 | return ret; | |
135 | } | |
136 | ||
137 | long | |
138 | scm_c_port_type_add_x (scm_t_ptob_descriptor *desc) | |
139 | { | |
140 | long ret = -1; | |
141 | ||
142 | scm_i_pthread_mutex_lock (&scm_ptobs_lock); | |
143 | ||
144 | if (scm_numptob + 1 < SCM_I_MAX_PORT_TYPE_COUNT) | |
145 | { | |
146 | if (scm_numptob == scm_ptobs_size) | |
147 | { | |
148 | unsigned long old_size = scm_ptobs_size; | |
149 | scm_t_ptob_descriptor **old_ptobs = scm_ptobs; | |
150 | ||
151 | /* Currently there are only 9 predefined port types, so one | |
152 | resize will cover it. */ | |
153 | scm_ptobs_size = old_size + 10; | |
154 | ||
155 | if (scm_ptobs_size >= SCM_I_MAX_PORT_TYPE_COUNT) | |
156 | scm_ptobs_size = SCM_I_MAX_PORT_TYPE_COUNT; | |
157 | ||
158 | scm_ptobs = scm_gc_malloc (sizeof (*scm_ptobs) * scm_ptobs_size, | |
159 | "scm_ptobs"); | |
160 | ||
161 | memcpy (scm_ptobs, old_ptobs, sizeof (*scm_ptobs) * scm_numptob); | |
162 | } | |
163 | ||
164 | ret = scm_numptob++; | |
165 | scm_ptobs[ret] = desc; | |
166 | } | |
167 | ||
168 | scm_i_pthread_mutex_unlock (&scm_ptobs_lock); | |
169 | ||
170 | if (ret < 0) | |
171 | scm_out_of_range ("scm_c_port_type_add_x", scm_from_long (scm_numptob)); | |
172 | ||
173 | return ret; | |
174 | } | |
0f2d19dd | 175 | |
f12733c9 | 176 | /* |
f12733c9 | 177 | * We choose to use an interface similar to the smob interface with |
affc96b5 | 178 | * fill_input and write as standard fields, passed to the port |
f12733c9 MD |
179 | * type constructor, and optional fields set by setters. |
180 | */ | |
181 | ||
70df8af6 | 182 | static void |
e81d98ec | 183 | flush_port_default (SCM port SCM_UNUSED) |
70df8af6 GH |
184 | { |
185 | } | |
186 | ||
187 | static void | |
e81d98ec | 188 | end_input_default (SCM port SCM_UNUSED, int offset SCM_UNUSED) |
70df8af6 GH |
189 | { |
190 | } | |
0f2d19dd | 191 | |
92c2555f | 192 | scm_t_bits |
f12733c9 | 193 | scm_make_port_type (char *name, |
affc96b5 | 194 | int (*fill_input) (SCM port), |
8aa011a1 | 195 | void (*write) (SCM port, const void *data, size_t size)) |
0f2d19dd | 196 | { |
62bd5d66 AW |
197 | scm_t_ptob_descriptor *desc; |
198 | long ptobnum; | |
affc96b5 | 199 | |
62bd5d66 AW |
200 | desc = scm_gc_malloc_pointerless (sizeof (*desc), "port-type"); |
201 | memset (desc, 0, sizeof (*desc)); | |
affc96b5 | 202 | |
62bd5d66 AW |
203 | desc->name = name; |
204 | desc->print = scm_port_print; | |
205 | desc->write = write; | |
206 | desc->flush = flush_port_default; | |
207 | desc->end_input = end_input_default; | |
208 | desc->fill_input = fill_input; | |
affc96b5 | 209 | |
62bd5d66 | 210 | ptobnum = scm_c_port_type_add_x (desc); |
affc96b5 | 211 | |
62bd5d66 | 212 | /* Make a class object if GOOPS is present. */ |
63385df2 | 213 | if (SCM_UNPACK (scm_port_class[0]) != 0) |
62bd5d66 AW |
214 | scm_make_port_classes (ptobnum, name); |
215 | ||
216 | return scm_tc7_port + ptobnum * 256; | |
0f2d19dd JB |
217 | } |
218 | ||
f12733c9 | 219 | void |
23f2b9a3 | 220 | scm_set_port_mark (scm_t_bits tc, SCM (*mark) (SCM)) |
f12733c9 | 221 | { |
62bd5d66 | 222 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->mark = mark; |
f12733c9 MD |
223 | } |
224 | ||
225 | void | |
23f2b9a3 | 226 | scm_set_port_free (scm_t_bits tc, size_t (*free) (SCM)) |
f12733c9 | 227 | { |
62bd5d66 | 228 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->free = free; |
f12733c9 MD |
229 | } |
230 | ||
231 | void | |
23f2b9a3 | 232 | scm_set_port_print (scm_t_bits tc, int (*print) (SCM exp, SCM port, |
f12733c9 MD |
233 | scm_print_state *pstate)) |
234 | { | |
62bd5d66 | 235 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->print = print; |
f12733c9 MD |
236 | } |
237 | ||
238 | void | |
23f2b9a3 | 239 | scm_set_port_equalp (scm_t_bits tc, SCM (*equalp) (SCM, SCM)) |
f12733c9 | 240 | { |
62bd5d66 | 241 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->equalp = equalp; |
f12733c9 MD |
242 | } |
243 | ||
31703ab8 | 244 | void |
23f2b9a3 | 245 | scm_set_port_flush (scm_t_bits tc, void (*flush) (SCM port)) |
31703ab8 | 246 | { |
62bd5d66 | 247 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->flush = flush; |
31703ab8 GH |
248 | } |
249 | ||
f12733c9 | 250 | void |
23f2b9a3 | 251 | scm_set_port_end_input (scm_t_bits tc, void (*end_input) (SCM port, int offset)) |
f12733c9 | 252 | { |
62bd5d66 | 253 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->end_input = end_input; |
f12733c9 MD |
254 | } |
255 | ||
256 | void | |
23f2b9a3 | 257 | scm_set_port_close (scm_t_bits tc, int (*close) (SCM)) |
f12733c9 | 258 | { |
62bd5d66 | 259 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->close = close; |
f12733c9 MD |
260 | } |
261 | ||
262 | void | |
f1ce9199 LC |
263 | scm_set_port_seek (scm_t_bits tc, |
264 | scm_t_off (*seek) (SCM, scm_t_off, int)) | |
f12733c9 | 265 | { |
62bd5d66 | 266 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->seek = seek; |
f12733c9 MD |
267 | } |
268 | ||
269 | void | |
f1ce9199 | 270 | scm_set_port_truncate (scm_t_bits tc, void (*truncate) (SCM, scm_t_off)) |
f12733c9 | 271 | { |
62bd5d66 | 272 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->truncate = truncate; |
f12733c9 MD |
273 | } |
274 | ||
275 | void | |
23f2b9a3 | 276 | scm_set_port_input_waiting (scm_t_bits tc, int (*input_waiting) (SCM)) |
f12733c9 | 277 | { |
62bd5d66 | 278 | scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->input_waiting = input_waiting; |
f12733c9 MD |
279 | } |
280 | ||
0f2d19dd | 281 | \f |
0f2d19dd | 282 | |
3b3b36dd | 283 | SCM_DEFINE (scm_char_ready_p, "char-ready?", 0, 1, 0, |
1e6808ea MG |
284 | (SCM port), |
285 | "Return @code{#t} if a character is ready on input @var{port}\n" | |
286 | "and return @code{#f} otherwise. If @code{char-ready?} returns\n" | |
287 | "@code{#t} then the next @code{read-char} operation on\n" | |
288 | "@var{port} is guaranteed not to hang. If @var{port} is a file\n" | |
289 | "port at end of file then @code{char-ready?} returns @code{#t}.\n" | |
c2dfff19 KR |
290 | "\n" |
291 | "@code{char-ready?} exists to make it possible for a\n" | |
1e6808ea MG |
292 | "program to accept characters from interactive ports without\n" |
293 | "getting stuck waiting for input. Any input editors associated\n" | |
294 | "with such ports must make sure that characters whose existence\n" | |
295 | "has been asserted by @code{char-ready?} cannot be rubbed out.\n" | |
296 | "If @code{char-ready?} were to return @code{#f} at end of file,\n" | |
297 | "a port at end of file would be indistinguishable from an\n" | |
c2dfff19 | 298 | "interactive port that has no ready characters.") |
1bbd0b84 | 299 | #define FUNC_NAME s_scm_char_ready_p |
0f2d19dd | 300 | { |
92c2555f | 301 | scm_t_port *pt; |
6c951427 | 302 | |
0f2d19dd | 303 | if (SCM_UNBNDP (port)) |
9de87eea | 304 | port = scm_current_input_port (); |
b2456dd4 AW |
305 | /* It's possible to close the current input port, so validate even in |
306 | this case. */ | |
307 | SCM_VALIDATE_OPINPORT (1, port); | |
d68fee48 | 308 | |
ae4c4016 JB |
309 | pt = SCM_PTAB_ENTRY (port); |
310 | ||
6c951427 GH |
311 | /* if the current read buffer is filled, or the |
312 | last pushed-back char has been read and the saved buffer is | |
313 | filled, result is true. */ | |
314 | if (pt->read_pos < pt->read_end | |
315 | || (pt->read_buf == pt->putback_buf | |
316 | && pt->saved_read_pos < pt->saved_read_end)) | |
0f2d19dd | 317 | return SCM_BOOL_T; |
ee149d03 JB |
318 | else |
319 | { | |
62bd5d66 | 320 | scm_t_ptob_descriptor *ptob = SCM_PORT_DESCRIPTOR (port); |
ee149d03 | 321 | |
affc96b5 | 322 | if (ptob->input_waiting) |
7888309b | 323 | return scm_from_bool(ptob->input_waiting (port)); |
ee149d03 | 324 | else |
6c951427 | 325 | return SCM_BOOL_T; |
ee149d03 | 326 | } |
0f2d19dd | 327 | } |
1bbd0b84 | 328 | #undef FUNC_NAME |
0f2d19dd | 329 | |
c2da2648 GH |
330 | /* move up to read_len chars from port's putback and/or read buffers |
331 | into memory starting at dest. returns the number of chars moved. */ | |
62bd5d66 AW |
332 | size_t |
333 | scm_take_from_input_buffers (SCM port, char *dest, size_t read_len) | |
c2da2648 | 334 | { |
92c2555f | 335 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
c2da2648 GH |
336 | size_t chars_read = 0; |
337 | size_t from_buf = min (pt->read_end - pt->read_pos, read_len); | |
338 | ||
339 | if (from_buf > 0) | |
340 | { | |
341 | memcpy (dest, pt->read_pos, from_buf); | |
342 | pt->read_pos += from_buf; | |
343 | chars_read += from_buf; | |
344 | read_len -= from_buf; | |
345 | dest += from_buf; | |
346 | } | |
347 | ||
348 | /* if putback was active, try the real input buffer too. */ | |
349 | if (pt->read_buf == pt->putback_buf) | |
350 | { | |
351 | from_buf = min (pt->saved_read_end - pt->saved_read_pos, read_len); | |
352 | if (from_buf > 0) | |
353 | { | |
354 | memcpy (dest, pt->saved_read_pos, from_buf); | |
355 | pt->saved_read_pos += from_buf; | |
356 | chars_read += from_buf; | |
357 | } | |
358 | } | |
359 | return chars_read; | |
360 | } | |
361 | ||
6c951427 | 362 | /* Clear a port's read buffers, returning the contents. */ |
a1ec6916 | 363 | SCM_DEFINE (scm_drain_input, "drain-input", 1, 0, 0, |
1bbd0b84 | 364 | (SCM port), |
4a151b3d GH |
365 | "This procedure clears a port's input buffers, similar\n" |
366 | "to the way that force-output clears the output buffer. The\n" | |
367 | "contents of the buffers are returned as a single string, e.g.,\n" | |
368 | "\n" | |
369 | "@lisp\n" | |
370 | "(define p (open-input-file ...))\n" | |
371 | "(drain-input p) => empty string, nothing buffered yet.\n" | |
372 | "(unread-char (read-char p) p)\n" | |
373 | "(drain-input p) => initial chars from p, up to the buffer size.\n" | |
374 | "@end lisp\n\n" | |
375 | "Draining the buffers may be useful for cleanly finishing\n" | |
376 | "buffered I/O so that the file descriptor can be used directly\n" | |
377 | "for further input.") | |
1bbd0b84 | 378 | #define FUNC_NAME s_scm_drain_input |
ee149d03 | 379 | { |
840ae05d | 380 | SCM result; |
3a5fb14d | 381 | char *data; |
28a6e1b0 | 382 | scm_t_port *pt; |
c014a02e | 383 | long count; |
ee149d03 | 384 | |
34d19ef6 | 385 | SCM_VALIDATE_OPINPORT (1, port); |
28a6e1b0 | 386 | pt = SCM_PTAB_ENTRY (port); |
840ae05d | 387 | |
6c951427 GH |
388 | count = pt->read_end - pt->read_pos; |
389 | if (pt->read_buf == pt->putback_buf) | |
390 | count += pt->saved_read_end - pt->saved_read_pos; | |
840ae05d | 391 | |
67a72dc1 AW |
392 | if (count) |
393 | { | |
190d4b0d | 394 | result = scm_i_make_string (count, &data, 0); |
67a72dc1 AW |
395 | scm_take_from_input_buffers (port, data, count); |
396 | } | |
397 | else | |
398 | result = scm_nullstr; | |
399 | ||
840ae05d | 400 | return result; |
ee149d03 | 401 | } |
1bbd0b84 | 402 | #undef FUNC_NAME |
0f2d19dd JB |
403 | |
404 | \f | |
d68fee48 | 405 | /* Standard ports --- current input, output, error, and more(!). */ |
0f2d19dd | 406 | |
34297700 AW |
407 | static SCM cur_inport_fluid = SCM_BOOL_F; |
408 | static SCM cur_outport_fluid = SCM_BOOL_F; | |
409 | static SCM cur_errport_fluid = SCM_BOOL_F; | |
410 | static SCM cur_loadport_fluid = SCM_BOOL_F; | |
9de87eea | 411 | |
3b3b36dd | 412 | SCM_DEFINE (scm_current_input_port, "current-input-port", 0, 0, 0, |
e1546b65 MG |
413 | (), |
414 | "Return the current input port. This is the default port used\n" | |
415 | "by many input procedures. Initially, @code{current-input-port}\n" | |
416 | "returns the @dfn{standard input} in Unix and C terminology.") | |
1bbd0b84 | 417 | #define FUNC_NAME s_scm_current_input_port |
0f2d19dd | 418 | { |
34297700 | 419 | if (scm_is_true (cur_inport_fluid)) |
889975e5 MG |
420 | return scm_fluid_ref (cur_inport_fluid); |
421 | else | |
422 | return SCM_BOOL_F; | |
0f2d19dd | 423 | } |
1bbd0b84 | 424 | #undef FUNC_NAME |
0f2d19dd | 425 | |
3b3b36dd | 426 | SCM_DEFINE (scm_current_output_port, "current-output-port", 0, 0, 0, |
e1546b65 MG |
427 | (), |
428 | "Return the current output port. This is the default port used\n" | |
9401323e | 429 | "by many output procedures. Initially,\n" |
e1546b65 MG |
430 | "@code{current-output-port} returns the @dfn{standard output} in\n" |
431 | "Unix and C terminology.") | |
1bbd0b84 | 432 | #define FUNC_NAME s_scm_current_output_port |
0f2d19dd | 433 | { |
34297700 | 434 | if (scm_is_true (cur_outport_fluid)) |
889975e5 MG |
435 | return scm_fluid_ref (cur_outport_fluid); |
436 | else | |
437 | return SCM_BOOL_F; | |
0f2d19dd | 438 | } |
1bbd0b84 | 439 | #undef FUNC_NAME |
0f2d19dd | 440 | |
3b3b36dd | 441 | SCM_DEFINE (scm_current_error_port, "current-error-port", 0, 0, 0, |
1bbd0b84 | 442 | (), |
b380b885 MD |
443 | "Return the port to which errors and warnings should be sent (the\n" |
444 | "@dfn{standard error} in Unix and C terminology).") | |
1bbd0b84 | 445 | #define FUNC_NAME s_scm_current_error_port |
0f2d19dd | 446 | { |
34297700 | 447 | if (scm_is_true (cur_errport_fluid)) |
889975e5 MG |
448 | return scm_fluid_ref (cur_errport_fluid); |
449 | else | |
450 | return SCM_BOOL_F; | |
0f2d19dd | 451 | } |
1bbd0b84 | 452 | #undef FUNC_NAME |
0f2d19dd | 453 | |
3b3b36dd | 454 | SCM_DEFINE (scm_current_load_port, "current-load-port", 0, 0, 0, |
e1546b65 | 455 | (), |
b450f070 | 456 | "Return the current-load-port.\n" |
e1546b65 | 457 | "The load port is used internally by @code{primitive-load}.") |
1bbd0b84 | 458 | #define FUNC_NAME s_scm_current_load_port |
31614d8e | 459 | { |
9de87eea | 460 | return scm_fluid_ref (cur_loadport_fluid); |
31614d8e | 461 | } |
1bbd0b84 | 462 | #undef FUNC_NAME |
31614d8e | 463 | |
3b3b36dd | 464 | SCM_DEFINE (scm_set_current_input_port, "set-current-input-port", 1, 0, 0, |
1bbd0b84 | 465 | (SCM port), |
8f85c0c6 NJ |
466 | "@deffnx {Scheme Procedure} set-current-output-port port\n" |
467 | "@deffnx {Scheme Procedure} set-current-error-port port\n" | |
b380b885 MD |
468 | "Change the ports returned by @code{current-input-port},\n" |
469 | "@code{current-output-port} and @code{current-error-port}, respectively,\n" | |
470 | "so that they use the supplied @var{port} for input or output.") | |
1bbd0b84 | 471 | #define FUNC_NAME s_scm_set_current_input_port |
0f2d19dd | 472 | { |
9de87eea | 473 | SCM oinp = scm_fluid_ref (cur_inport_fluid); |
34d19ef6 | 474 | SCM_VALIDATE_OPINPORT (1, port); |
9de87eea | 475 | scm_fluid_set_x (cur_inport_fluid, port); |
0f2d19dd JB |
476 | return oinp; |
477 | } | |
1bbd0b84 | 478 | #undef FUNC_NAME |
0f2d19dd JB |
479 | |
480 | ||
3b3b36dd | 481 | SCM_DEFINE (scm_set_current_output_port, "set-current-output-port", 1, 0, 0, |
e1546b65 MG |
482 | (SCM port), |
483 | "Set the current default output port to @var{port}.") | |
1bbd0b84 | 484 | #define FUNC_NAME s_scm_set_current_output_port |
0f2d19dd | 485 | { |
9de87eea | 486 | SCM ooutp = scm_fluid_ref (cur_outport_fluid); |
78446828 | 487 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 488 | SCM_VALIDATE_OPOUTPORT (1, port); |
9de87eea | 489 | scm_fluid_set_x (cur_outport_fluid, port); |
0f2d19dd JB |
490 | return ooutp; |
491 | } | |
1bbd0b84 | 492 | #undef FUNC_NAME |
0f2d19dd JB |
493 | |
494 | ||
3b3b36dd | 495 | SCM_DEFINE (scm_set_current_error_port, "set-current-error-port", 1, 0, 0, |
e1546b65 MG |
496 | (SCM port), |
497 | "Set the current default error port to @var{port}.") | |
1bbd0b84 | 498 | #define FUNC_NAME s_scm_set_current_error_port |
0f2d19dd | 499 | { |
9de87eea | 500 | SCM oerrp = scm_fluid_ref (cur_errport_fluid); |
78446828 | 501 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 502 | SCM_VALIDATE_OPOUTPORT (1, port); |
9de87eea | 503 | scm_fluid_set_x (cur_errport_fluid, port); |
0f2d19dd JB |
504 | return oerrp; |
505 | } | |
1bbd0b84 | 506 | #undef FUNC_NAME |
0f2d19dd | 507 | |
185e369a | 508 | void |
661ae7ab | 509 | scm_dynwind_current_input_port (SCM port) |
9de87eea | 510 | #define FUNC_NAME NULL |
185e369a | 511 | { |
9de87eea | 512 | SCM_VALIDATE_OPINPORT (1, port); |
661ae7ab | 513 | scm_dynwind_fluid (cur_inport_fluid, port); |
185e369a | 514 | } |
9de87eea | 515 | #undef FUNC_NAME |
185e369a MV |
516 | |
517 | void | |
661ae7ab | 518 | scm_dynwind_current_output_port (SCM port) |
9de87eea | 519 | #define FUNC_NAME NULL |
185e369a | 520 | { |
9de87eea MV |
521 | port = SCM_COERCE_OUTPORT (port); |
522 | SCM_VALIDATE_OPOUTPORT (1, port); | |
661ae7ab | 523 | scm_dynwind_fluid (cur_outport_fluid, port); |
185e369a | 524 | } |
9de87eea | 525 | #undef FUNC_NAME |
185e369a MV |
526 | |
527 | void | |
661ae7ab | 528 | scm_dynwind_current_error_port (SCM port) |
9de87eea MV |
529 | #define FUNC_NAME NULL |
530 | { | |
531 | port = SCM_COERCE_OUTPORT (port); | |
532 | SCM_VALIDATE_OPOUTPORT (1, port); | |
661ae7ab | 533 | scm_dynwind_fluid (cur_errport_fluid, port); |
9de87eea MV |
534 | } |
535 | #undef FUNC_NAME | |
536 | ||
537 | void | |
661ae7ab | 538 | scm_i_dynwind_current_load_port (SCM port) |
185e369a | 539 | { |
661ae7ab | 540 | scm_dynwind_fluid (cur_loadport_fluid, port); |
185e369a MV |
541 | } |
542 | ||
0f2d19dd | 543 | \f |
840ae05d | 544 | /* The port table --- an array of pointers to ports. */ |
0f2d19dd | 545 | |
5dbc6c06 HWN |
546 | /* |
547 | We need a global registry of ports to flush them all at exit, and to | |
548 | get all the ports matching a file descriptor. | |
549 | */ | |
2721f918 | 550 | SCM scm_i_port_weak_set; |
b9ad392e | 551 | |
651a0735 LC |
552 | \f |
553 | /* Port finalization. */ | |
554 | ||
1cc91f1b | 555 | |
651a0735 LC |
556 | static void finalize_port (GC_PTR, GC_PTR); |
557 | ||
f4bc4e59 | 558 | /* Register a finalizer for PORT. */ |
651a0735 LC |
559 | static SCM_C_INLINE_KEYWORD void |
560 | register_finalizer_for_port (SCM port) | |
561 | { | |
f4bc4e59 LC |
562 | GC_finalization_proc prev_finalizer; |
563 | GC_PTR prev_finalization_data; | |
651a0735 | 564 | |
f4bc4e59 LC |
565 | /* Register a finalizer for PORT so that its iconv CDs get freed and |
566 | optionally its type's `free' function gets called. */ | |
47ed8656 AW |
567 | GC_REGISTER_FINALIZER_NO_ORDER (SCM_HEAP_OBJECT_BASE (port), |
568 | finalize_port, 0, | |
f4bc4e59 LC |
569 | &prev_finalizer, |
570 | &prev_finalization_data); | |
651a0735 LC |
571 | } |
572 | ||
573 | /* Finalize the object (a port) pointed to by PTR. */ | |
574 | static void | |
575 | finalize_port (GC_PTR ptr, GC_PTR data) | |
576 | { | |
21041372 | 577 | SCM port = SCM_PACK_POINTER (ptr); |
651a0735 LC |
578 | |
579 | if (!SCM_PORTP (port)) | |
580 | abort (); | |
581 | ||
582 | if (SCM_OPENP (port)) | |
583 | { | |
584 | if (SCM_REVEALED (port) > 0) | |
585 | /* Keep "revealed" ports alive and re-register a finalizer. */ | |
586 | register_finalizer_for_port (port); | |
587 | else | |
588 | { | |
62bd5d66 | 589 | scm_t_ptob_descriptor *ptob = SCM_PORT_DESCRIPTOR (port); |
f4bc4e59 LC |
590 | scm_t_port *entry; |
591 | ||
62bd5d66 AW |
592 | if (ptob->free) |
593 | /* Yes, I really do mean `free' rather than `close'. `close' | |
651a0735 | 594 | is for explicit `close-port' by user. */ |
62bd5d66 | 595 | ptob->free (port); |
651a0735 | 596 | |
f4bc4e59 LC |
597 | entry = SCM_PTAB_ENTRY (port); |
598 | ||
599 | if (entry->input_cd != (iconv_t) -1) | |
600 | iconv_close (entry->input_cd); | |
601 | if (entry->output_cd != (iconv_t) -1) | |
602 | iconv_close (entry->output_cd); | |
603 | ||
651a0735 LC |
604 | SCM_SETSTREAM (port, 0); |
605 | SCM_CLR_PORT_OPEN_FLAG (port); | |
651a0735 LC |
606 | |
607 | scm_gc_ports_collected++; | |
608 | } | |
609 | } | |
610 | } | |
611 | ||
612 | ||
613 | ||
614 | \f | |
615 | ||
da220f27 | 616 | SCM |
2721f918 AW |
617 | scm_c_make_port_with_encoding (scm_t_bits tag, unsigned long mode_bits, |
618 | const char *encoding, | |
619 | scm_t_string_failed_conversion_handler handler, | |
620 | scm_t_bits stream) | |
0f2d19dd | 621 | { |
2721f918 AW |
622 | SCM ret; |
623 | scm_t_port *entry; | |
62bd5d66 | 624 | scm_t_ptob_descriptor *ptob; |
2721f918 AW |
625 | |
626 | entry = (scm_t_port *) scm_gc_calloc (sizeof (scm_t_port), "port"); | |
62bd5d66 AW |
627 | ptob = scm_c_port_type_ref (SCM_TC2PTOBNUM (tag)); |
628 | ||
629 | ret = scm_words (tag | mode_bits, 3); | |
630 | SCM_SET_CELL_WORD_1 (ret, (scm_t_bits) entry); | |
631 | SCM_SET_CELL_WORD_2 (ret, (scm_t_bits) ptob); | |
5f16b897 | 632 | |
30b126d2 AW |
633 | #if SCM_USE_PTHREAD_THREADS |
634 | scm_i_pthread_mutex_init (&entry->lock, scm_i_pthread_mutexattr_recursive); | |
635 | #endif | |
636 | ||
840ae05d | 637 | entry->file_name = SCM_BOOL_F; |
61e452ba | 638 | entry->rw_active = SCM_PORT_NEITHER; |
2721f918 AW |
639 | entry->port = ret; |
640 | entry->stream = stream; | |
641 | entry->encoding = encoding ? scm_gc_strdup (encoding, "port") : NULL; | |
f4bc4e59 LC |
642 | /* The conversion descriptors will be opened lazily. */ |
643 | entry->input_cd = (iconv_t) -1; | |
644 | entry->output_cd = (iconv_t) -1; | |
2721f918 | 645 | entry->ilseq_handler = handler; |
f4bc4e59 | 646 | |
2721f918 | 647 | scm_weak_set_add_x (scm_i_port_weak_set, ret); |
651a0735 LC |
648 | |
649 | /* For each new port, register a finalizer so that it port type's free | |
650 | function can be invoked eventually. */ | |
2721f918 | 651 | register_finalizer_for_port (ret); |
651a0735 | 652 | |
2721f918 AW |
653 | return ret; |
654 | } | |
655 | ||
656 | SCM | |
657 | scm_c_make_port (scm_t_bits tag, unsigned long mode_bits, scm_t_bits stream) | |
658 | { | |
659 | return scm_c_make_port_with_encoding (tag, mode_bits, | |
660 | scm_i_default_port_encoding (), | |
661 | scm_i_get_conversion_strategy (SCM_BOOL_F), | |
662 | stream); | |
663 | } | |
664 | ||
665 | SCM | |
666 | scm_new_port_table_entry (scm_t_bits tag) | |
667 | { | |
668 | return scm_c_make_port (tag, 0, 0); | |
0f2d19dd JB |
669 | } |
670 | ||
6c951427 | 671 | /* Remove a port from the table and destroy it. */ |
b9ad392e | 672 | |
8269ba5b | 673 | static void |
5dbc6c06 HWN |
674 | scm_i_remove_port (SCM port) |
675 | #define FUNC_NAME "scm_remove_port" | |
0f2d19dd | 676 | { |
8269ba5b | 677 | scm_t_port *p; |
682d78d0 | 678 | |
8269ba5b AW |
679 | p = SCM_PTAB_ENTRY (port); |
680 | scm_port_non_buffer (p); | |
2721f918 AW |
681 | SCM_SETPTAB_ENTRY (port, 0); |
682 | scm_weak_set_remove_x (scm_i_port_weak_set, port); | |
683 | ||
682d78d0 LC |
684 | p->putback_buf = NULL; |
685 | p->putback_buf_size = 0; | |
3e05fc04 AW |
686 | |
687 | if (p->input_cd != (iconv_t) -1) | |
688 | { | |
689 | iconv_close (p->input_cd); | |
690 | p->input_cd = (iconv_t) -1; | |
691 | } | |
692 | ||
693 | if (p->output_cd != (iconv_t) -1) | |
694 | { | |
695 | iconv_close (p->output_cd); | |
696 | p->output_cd = (iconv_t) -1; | |
697 | } | |
0f2d19dd | 698 | } |
db4b4ca6 DH |
699 | #undef FUNC_NAME |
700 | ||
0f2d19dd | 701 | |
70df8af6 | 702 | void |
92c2555f | 703 | scm_port_non_buffer (scm_t_port *pt) |
70df8af6 GH |
704 | { |
705 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; | |
706 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
707 | pt->read_buf_size = pt->write_buf_size = 1; | |
708 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
709 | } | |
0f2d19dd | 710 | |
d68fee48 JB |
711 | \f |
712 | /* Revealed counts --- an oddity inherited from SCSH. */ | |
713 | ||
8b13c6b3 GH |
714 | /* Find a port in the table and return its revealed count. |
715 | Also used by the garbage collector. | |
0f2d19dd | 716 | */ |
1cc91f1b | 717 | |
0f2d19dd | 718 | int |
a284e297 | 719 | scm_revealed_count (SCM port) |
0f2d19dd JB |
720 | { |
721 | return SCM_REVEALED(port); | |
722 | } | |
723 | ||
724 | ||
725 | ||
726 | /* Return the revealed count for a port. */ | |
727 | ||
3b3b36dd | 728 | SCM_DEFINE (scm_port_revealed, "port-revealed", 1, 0, 0, |
1bbd0b84 | 729 | (SCM port), |
1e6808ea | 730 | "Return the revealed count for @var{port}.") |
1bbd0b84 | 731 | #define FUNC_NAME s_scm_port_revealed |
0f2d19dd | 732 | { |
78446828 | 733 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 734 | SCM_VALIDATE_OPENPORT (1, port); |
e11e83f3 | 735 | return scm_from_int (scm_revealed_count (port)); |
0f2d19dd | 736 | } |
1bbd0b84 | 737 | #undef FUNC_NAME |
0f2d19dd JB |
738 | |
739 | /* Set the revealed count for a port. */ | |
3b3b36dd | 740 | SCM_DEFINE (scm_set_port_revealed_x, "set-port-revealed!", 2, 0, 0, |
1bbd0b84 | 741 | (SCM port, SCM rcount), |
b450f070 | 742 | "Sets the revealed count for a port to a given value.\n" |
b380b885 | 743 | "The return value is unspecified.") |
1bbd0b84 | 744 | #define FUNC_NAME s_scm_set_port_revealed_x |
0f2d19dd | 745 | { |
78446828 | 746 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 747 | SCM_VALIDATE_OPENPORT (1, port); |
a55c2b68 | 748 | SCM_REVEALED (port) = scm_to_int (rcount); |
8b13c6b3 | 749 | return SCM_UNSPECIFIED; |
0f2d19dd | 750 | } |
1bbd0b84 | 751 | #undef FUNC_NAME |
0f2d19dd | 752 | |
d68fee48 JB |
753 | |
754 | \f | |
755 | /* Retrieving a port's mode. */ | |
756 | ||
eadd48de GH |
757 | /* Return the flags that characterize a port based on the mode |
758 | * string used to open a file for that port. | |
759 | * | |
760 | * See PORT FLAGS in scm.h | |
761 | */ | |
762 | ||
3a5fb14d | 763 | static long |
889975e5 | 764 | scm_i_mode_bits_n (SCM modes) |
3a5fb14d MV |
765 | { |
766 | return (SCM_OPN | |
889975e5 MG |
767 | | (scm_i_string_contains_char (modes, 'r') |
768 | || scm_i_string_contains_char (modes, '+') ? SCM_RDNG : 0) | |
769 | | (scm_i_string_contains_char (modes, 'w') | |
770 | || scm_i_string_contains_char (modes, 'a') | |
771 | || scm_i_string_contains_char (modes, '+') ? SCM_WRTNG : 0) | |
772 | | (scm_i_string_contains_char (modes, '0') ? SCM_BUF0 : 0) | |
773 | | (scm_i_string_contains_char (modes, 'l') ? SCM_BUFLINE : 0)); | |
3a5fb14d MV |
774 | } |
775 | ||
eadd48de | 776 | long |
a284e297 | 777 | scm_mode_bits (char *modes) |
eadd48de | 778 | { |
889975e5 | 779 | return scm_i_mode_bits (scm_from_locale_string (modes)); |
eadd48de GH |
780 | } |
781 | ||
d617ee18 MV |
782 | long |
783 | scm_i_mode_bits (SCM modes) | |
784 | { | |
785 | long bits; | |
786 | ||
787 | if (!scm_is_string (modes)) | |
788 | scm_wrong_type_arg_msg (NULL, 0, modes, "string"); | |
789 | ||
889975e5 | 790 | bits = scm_i_mode_bits_n (modes); |
d617ee18 MV |
791 | scm_remember_upto_here_1 (modes); |
792 | return bits; | |
793 | } | |
eadd48de GH |
794 | |
795 | /* Return the mode flags from an open port. | |
796 | * Some modes such as "append" are only used when opening | |
797 | * a file and are not returned here. */ | |
798 | ||
3b3b36dd | 799 | SCM_DEFINE (scm_port_mode, "port-mode", 1, 0, 0, |
1bbd0b84 | 800 | (SCM port), |
1e6808ea MG |
801 | "Return the port modes associated with the open port @var{port}.\n" |
802 | "These will not necessarily be identical to the modes used when\n" | |
803 | "the port was opened, since modes such as \"append\" which are\n" | |
804 | "used only during port creation are not retained.") | |
1bbd0b84 | 805 | #define FUNC_NAME s_scm_port_mode |
eadd48de | 806 | { |
26a3038d | 807 | char modes[4]; |
eadd48de | 808 | modes[0] = '\0'; |
78446828 MV |
809 | |
810 | port = SCM_COERCE_OUTPORT (port); | |
34d19ef6 | 811 | SCM_VALIDATE_OPPORT (1, port); |
f9a64404 DH |
812 | if (SCM_CELL_WORD_0 (port) & SCM_RDNG) { |
813 | if (SCM_CELL_WORD_0 (port) & SCM_WRTNG) | |
eadd48de GH |
814 | strcpy (modes, "r+"); |
815 | else | |
816 | strcpy (modes, "r"); | |
817 | } | |
f9a64404 | 818 | else if (SCM_CELL_WORD_0 (port) & SCM_WRTNG) |
eadd48de | 819 | strcpy (modes, "w"); |
f9a64404 | 820 | if (SCM_CELL_WORD_0 (port) & SCM_BUF0) |
eadd48de | 821 | strcat (modes, "0"); |
62bd5d66 AW |
822 | |
823 | return scm_from_latin1_string (modes); | |
eadd48de | 824 | } |
1bbd0b84 | 825 | #undef FUNC_NAME |
eadd48de GH |
826 | |
827 | ||
d68fee48 JB |
828 | \f |
829 | /* Closing ports. */ | |
830 | ||
0f2d19dd JB |
831 | /* scm_close_port |
832 | * Call the close operation on a port object. | |
eadd48de | 833 | * see also scm_close. |
0f2d19dd | 834 | */ |
3b3b36dd | 835 | SCM_DEFINE (scm_close_port, "close-port", 1, 0, 0, |
1bbd0b84 | 836 | (SCM port), |
1e6808ea MG |
837 | "Close the specified port object. Return @code{#t} if it\n" |
838 | "successfully closes a port or @code{#f} if it was already\n" | |
839 | "closed. An exception may be raised if an error occurs, for\n" | |
840 | "example when flushing buffered output. See also @ref{Ports and\n" | |
841 | "File Descriptors, close}, for a procedure which can close file\n" | |
842 | "descriptors.") | |
1bbd0b84 | 843 | #define FUNC_NAME s_scm_close_port |
0f2d19dd | 844 | { |
eadd48de GH |
845 | int rv; |
846 | ||
78446828 MV |
847 | port = SCM_COERCE_OUTPORT (port); |
848 | ||
7a754ca6 | 849 | SCM_VALIDATE_PORT (1, port); |
0f2d19dd | 850 | if (SCM_CLOSEDP (port)) |
eadd48de | 851 | return SCM_BOOL_F; |
62bd5d66 AW |
852 | if (SCM_PORT_DESCRIPTOR (port)->close) |
853 | rv = SCM_PORT_DESCRIPTOR (port)->close (port); | |
eadd48de GH |
854 | else |
855 | rv = 0; | |
5dbc6c06 | 856 | scm_i_remove_port (port); |
22a52da1 | 857 | SCM_CLR_PORT_OPEN_FLAG (port); |
7888309b | 858 | return scm_from_bool (rv >= 0); |
7a754ca6 MD |
859 | } |
860 | #undef FUNC_NAME | |
861 | ||
862 | SCM_DEFINE (scm_close_input_port, "close-input-port", 1, 0, 0, | |
863 | (SCM port), | |
864 | "Close the specified input port object. The routine has no effect if\n" | |
865 | "the file has already been closed. An exception may be raised if an\n" | |
866 | "error occurs. The value returned is unspecified.\n\n" | |
867 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" | |
868 | "which can close file descriptors.") | |
869 | #define FUNC_NAME s_scm_close_input_port | |
870 | { | |
871 | SCM_VALIDATE_INPUT_PORT (1, port); | |
872 | scm_close_port (port); | |
873 | return SCM_UNSPECIFIED; | |
874 | } | |
875 | #undef FUNC_NAME | |
876 | ||
877 | SCM_DEFINE (scm_close_output_port, "close-output-port", 1, 0, 0, | |
878 | (SCM port), | |
879 | "Close the specified output port object. The routine has no effect if\n" | |
880 | "the file has already been closed. An exception may be raised if an\n" | |
881 | "error occurs. The value returned is unspecified.\n\n" | |
882 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" | |
883 | "which can close file descriptors.") | |
884 | #define FUNC_NAME s_scm_close_output_port | |
885 | { | |
886 | port = SCM_COERCE_OUTPORT (port); | |
887 | SCM_VALIDATE_OUTPUT_PORT (1, port); | |
888 | scm_close_port (port); | |
889 | return SCM_UNSPECIFIED; | |
0f2d19dd | 890 | } |
1bbd0b84 | 891 | #undef FUNC_NAME |
0f2d19dd | 892 | |
2721f918 AW |
893 | struct for_each_data |
894 | { | |
895 | void (*proc) (void *data, SCM p); | |
896 | void *data; | |
897 | }; | |
898 | ||
5dbc6c06 | 899 | static SCM |
2721f918 | 900 | for_each_trampoline (void *data, SCM port, SCM result) |
5dbc6c06 | 901 | { |
2721f918 AW |
902 | struct for_each_data *d = data; |
903 | ||
904 | d->proc (d->data, port); | |
905 | ||
906 | return result; | |
5dbc6c06 HWN |
907 | } |
908 | ||
c536b4b3 MV |
909 | void |
910 | scm_c_port_for_each (void (*proc)(void *data, SCM p), void *data) | |
c2ca4493 | 911 | { |
2721f918 AW |
912 | struct for_each_data d; |
913 | ||
914 | d.proc = proc; | |
915 | d.data = data; | |
fdfe6305 | 916 | |
2721f918 AW |
917 | scm_c_weak_set_fold (for_each_trampoline, &d, SCM_EOL, |
918 | scm_i_port_weak_set); | |
919 | } | |
3a5fb14d | 920 | |
2721f918 AW |
921 | static void |
922 | scm_for_each_trampoline (void *data, SCM port) | |
923 | { | |
21041372 | 924 | scm_call_1 (SCM_PACK_POINTER (data), port); |
c536b4b3 | 925 | } |
fdfe6305 | 926 | |
c536b4b3 MV |
927 | SCM_DEFINE (scm_port_for_each, "port-for-each", 1, 0, 0, |
928 | (SCM proc), | |
929 | "Apply @var{proc} to each port in the Guile port table\n" | |
930 | "in turn. The return value is unspecified. More specifically,\n" | |
931 | "@var{proc} is applied exactly once to every port that exists\n" | |
932 | "in the system at the time @var{port-for-each} is invoked.\n" | |
933 | "Changes to the port table while @var{port-for-each} is running\n" | |
934 | "have no effect as far as @var{port-for-each} is concerned.") | |
935 | #define FUNC_NAME s_scm_port_for_each | |
936 | { | |
937 | SCM_VALIDATE_PROC (1, proc); | |
938 | ||
21041372 | 939 | scm_c_port_for_each (scm_for_each_trampoline, SCM_UNPACK_POINTER (proc)); |
2721f918 | 940 | |
c2ca4493 GH |
941 | return SCM_UNSPECIFIED; |
942 | } | |
943 | #undef FUNC_NAME | |
944 | ||
c536b4b3 | 945 | |
d68fee48 JB |
946 | \f |
947 | /* Utter miscellany. Gosh, we should clean this up some time. */ | |
948 | ||
3b3b36dd | 949 | SCM_DEFINE (scm_input_port_p, "input-port?", 1, 0, 0, |
1bbd0b84 | 950 | (SCM x), |
1e6808ea MG |
951 | "Return @code{#t} if @var{x} is an input port, otherwise return\n" |
952 | "@code{#f}. Any object satisfying this predicate also satisfies\n" | |
953 | "@code{port?}.") | |
1bbd0b84 | 954 | #define FUNC_NAME s_scm_input_port_p |
0f2d19dd | 955 | { |
7888309b | 956 | return scm_from_bool (SCM_INPUT_PORT_P (x)); |
0f2d19dd | 957 | } |
1bbd0b84 | 958 | #undef FUNC_NAME |
0f2d19dd | 959 | |
3b3b36dd | 960 | SCM_DEFINE (scm_output_port_p, "output-port?", 1, 0, 0, |
1bbd0b84 | 961 | (SCM x), |
1e6808ea MG |
962 | "Return @code{#t} if @var{x} is an output port, otherwise return\n" |
963 | "@code{#f}. Any object satisfying this predicate also satisfies\n" | |
964 | "@code{port?}.") | |
1bbd0b84 | 965 | #define FUNC_NAME s_scm_output_port_p |
0f2d19dd | 966 | { |
82893676 | 967 | x = SCM_COERCE_OUTPORT (x); |
7888309b | 968 | return scm_from_bool (SCM_OUTPUT_PORT_P (x)); |
0f2d19dd | 969 | } |
1bbd0b84 | 970 | #undef FUNC_NAME |
0f2d19dd | 971 | |
eb5c0a2a GH |
972 | SCM_DEFINE (scm_port_p, "port?", 1, 0, 0, |
973 | (SCM x), | |
1e6808ea | 974 | "Return a boolean indicating whether @var{x} is a port.\n" |
5352393c MG |
975 | "Equivalent to @code{(or (input-port? @var{x}) (output-port?\n" |
976 | "@var{x}))}.") | |
eb5c0a2a GH |
977 | #define FUNC_NAME s_scm_port_p |
978 | { | |
7888309b | 979 | return scm_from_bool (SCM_PORTP (x)); |
eb5c0a2a GH |
980 | } |
981 | #undef FUNC_NAME | |
982 | ||
3b3b36dd | 983 | SCM_DEFINE (scm_port_closed_p, "port-closed?", 1, 0, 0, |
1bbd0b84 | 984 | (SCM port), |
1e6808ea MG |
985 | "Return @code{#t} if @var{port} is closed or @code{#f} if it is\n" |
986 | "open.") | |
1bbd0b84 | 987 | #define FUNC_NAME s_scm_port_closed_p |
60d0643d | 988 | { |
34d19ef6 | 989 | SCM_VALIDATE_PORT (1, port); |
7888309b | 990 | return scm_from_bool (!SCM_OPPORTP (port)); |
60d0643d | 991 | } |
1bbd0b84 | 992 | #undef FUNC_NAME |
0f2d19dd | 993 | |
3b3b36dd | 994 | SCM_DEFINE (scm_eof_object_p, "eof-object?", 1, 0, 0, |
1bbd0b84 | 995 | (SCM x), |
1e6808ea MG |
996 | "Return @code{#t} if @var{x} is an end-of-file object; otherwise\n" |
997 | "return @code{#f}.") | |
1bbd0b84 | 998 | #define FUNC_NAME s_scm_eof_object_p |
0f2d19dd | 999 | { |
7888309b | 1000 | return scm_from_bool(SCM_EOF_OBJECT_P (x)); |
0f2d19dd | 1001 | } |
1bbd0b84 | 1002 | #undef FUNC_NAME |
0f2d19dd | 1003 | |
3b3b36dd | 1004 | SCM_DEFINE (scm_force_output, "force-output", 0, 1, 0, |
1bbd0b84 | 1005 | (SCM port), |
b380b885 | 1006 | "Flush the specified output port, or the current output port if @var{port}\n" |
9401323e | 1007 | "is omitted. The current output buffer contents are passed to the\n" |
b380b885 MD |
1008 | "underlying port implementation (e.g., in the case of fports, the\n" |
1009 | "data will be written to the file and the output buffer will be cleared.)\n" | |
1010 | "It has no effect on an unbuffered port.\n\n" | |
1011 | "The return value is unspecified.") | |
1bbd0b84 | 1012 | #define FUNC_NAME s_scm_force_output |
0f2d19dd JB |
1013 | { |
1014 | if (SCM_UNBNDP (port)) | |
9de87eea | 1015 | port = scm_current_output_port (); |
0f2d19dd | 1016 | else |
78446828 MV |
1017 | { |
1018 | port = SCM_COERCE_OUTPORT (port); | |
34d19ef6 | 1019 | SCM_VALIDATE_OPOUTPORT (1, port); |
78446828 | 1020 | } |
affc96b5 | 1021 | scm_flush (port); |
ee149d03 | 1022 | return SCM_UNSPECIFIED; |
0f2d19dd | 1023 | } |
1bbd0b84 | 1024 | #undef FUNC_NAME |
0f2d19dd | 1025 | |
5dbc6c06 HWN |
1026 | |
1027 | static void | |
61d3568b | 1028 | flush_output_port (void *closure, SCM port) |
5dbc6c06 | 1029 | { |
5dbc6c06 HWN |
1030 | if (SCM_OPOUTPORTP (port)) |
1031 | scm_flush (port); | |
1032 | } | |
1033 | ||
a1ec6916 | 1034 | SCM_DEFINE (scm_flush_all_ports, "flush-all-ports", 0, 0, 0, |
1bbd0b84 | 1035 | (), |
b380b885 MD |
1036 | "Equivalent to calling @code{force-output} on\n" |
1037 | "all open output ports. The return value is unspecified.") | |
1bbd0b84 | 1038 | #define FUNC_NAME s_scm_flush_all_ports |
89ea5b7c | 1039 | { |
5dbc6c06 | 1040 | scm_c_port_for_each (&flush_output_port, NULL); |
89ea5b7c GH |
1041 | return SCM_UNSPECIFIED; |
1042 | } | |
1bbd0b84 | 1043 | #undef FUNC_NAME |
0f2d19dd | 1044 | |
3b3b36dd | 1045 | SCM_DEFINE (scm_read_char, "read-char", 0, 1, 0, |
1bbd0b84 | 1046 | (SCM port), |
1e6808ea MG |
1047 | "Return the next character available from @var{port}, updating\n" |
1048 | "@var{port} to point to the following character. If no more\n" | |
c62da8f8 LC |
1049 | "characters are available, the end-of-file object is returned.\n" |
1050 | "\n" | |
1051 | "When @var{port}'s data cannot be decoded according to its\n" | |
1052 | "character encoding, a @code{decoding-error} is raised and\n" | |
1053 | "@var{port} points past the erroneous byte sequence.\n") | |
1bbd0b84 | 1054 | #define FUNC_NAME s_scm_read_char |
0f2d19dd | 1055 | { |
889975e5 | 1056 | scm_t_wchar c; |
0f2d19dd | 1057 | if (SCM_UNBNDP (port)) |
9de87eea | 1058 | port = scm_current_input_port (); |
34d19ef6 | 1059 | SCM_VALIDATE_OPINPORT (1, port); |
b7f3516f | 1060 | c = scm_getc (port); |
0f2d19dd JB |
1061 | if (EOF == c) |
1062 | return SCM_EOF_VAL; | |
7866a09b | 1063 | return SCM_MAKE_CHAR (c); |
0f2d19dd | 1064 | } |
1bbd0b84 | 1065 | #undef FUNC_NAME |
0f2d19dd | 1066 | |
f4bc4e59 LC |
1067 | /* Update the line and column number of PORT after consumption of C. */ |
1068 | static inline void | |
1069 | update_port_lf (scm_t_wchar c, SCM port) | |
1070 | { | |
1071 | switch (c) | |
1072 | { | |
1073 | case '\a': | |
7b292a9d | 1074 | case EOF: |
f4bc4e59 LC |
1075 | break; |
1076 | case '\b': | |
1077 | SCM_DECCOL (port); | |
1078 | break; | |
1079 | case '\n': | |
1080 | SCM_INCLINE (port); | |
1081 | break; | |
1082 | case '\r': | |
1083 | SCM_ZEROCOL (port); | |
1084 | break; | |
1085 | case '\t': | |
1086 | SCM_TABCOL (port); | |
1087 | break; | |
1088 | default: | |
1089 | SCM_INCCOL (port); | |
1090 | break; | |
1091 | } | |
1092 | } | |
1093 | ||
889975e5 MG |
1094 | #define SCM_MBCHAR_BUF_SIZE (4) |
1095 | ||
f4bc4e59 LC |
1096 | /* Convert the SIZE-byte UTF-8 sequence in UTF8_BUF to a codepoint. |
1097 | UTF8_BUF is assumed to contain a valid UTF-8 sequence. */ | |
1098 | static scm_t_wchar | |
1099 | utf8_to_codepoint (const scm_t_uint8 *utf8_buf, size_t size) | |
1100 | { | |
1101 | scm_t_wchar codepoint; | |
1102 | ||
1103 | if (utf8_buf[0] <= 0x7f) | |
1104 | { | |
1105 | assert (size == 1); | |
1106 | codepoint = utf8_buf[0]; | |
1107 | } | |
1108 | else if ((utf8_buf[0] & 0xe0) == 0xc0) | |
1109 | { | |
1110 | assert (size == 2); | |
1111 | codepoint = ((scm_t_wchar) utf8_buf[0] & 0x1f) << 6UL | |
1112 | | (utf8_buf[1] & 0x3f); | |
1113 | } | |
1114 | else if ((utf8_buf[0] & 0xf0) == 0xe0) | |
1115 | { | |
1116 | assert (size == 3); | |
1117 | codepoint = ((scm_t_wchar) utf8_buf[0] & 0x0f) << 12UL | |
1118 | | ((scm_t_wchar) utf8_buf[1] & 0x3f) << 6UL | |
1119 | | (utf8_buf[2] & 0x3f); | |
1120 | } | |
1121 | else | |
1122 | { | |
1123 | assert (size == 4); | |
1124 | codepoint = ((scm_t_wchar) utf8_buf[0] & 0x07) << 18UL | |
1125 | | ((scm_t_wchar) utf8_buf[1] & 0x3f) << 12UL | |
1126 | | ((scm_t_wchar) utf8_buf[2] & 0x3f) << 6UL | |
1127 | | (utf8_buf[3] & 0x3f); | |
1128 | } | |
1129 | ||
1130 | return codepoint; | |
1131 | } | |
1132 | ||
7b292a9d LC |
1133 | /* Read a UTF-8 sequence from PORT. On success, return 0 and set |
1134 | *CODEPOINT to the codepoint that was read, fill BUF with its UTF-8 | |
1135 | representation, and set *LEN to the length in bytes. Return | |
1136 | `EILSEQ' on error. */ | |
c62da8f8 | 1137 | static int |
7b292a9d LC |
1138 | get_utf8_codepoint (SCM port, scm_t_wchar *codepoint, |
1139 | scm_t_uint8 buf[SCM_MBCHAR_BUF_SIZE], size_t *len) | |
889975e5 | 1140 | { |
7b292a9d LC |
1141 | #define ASSERT_NOT_EOF(b) \ |
1142 | if (SCM_UNLIKELY ((b) == EOF)) \ | |
1143 | goto invalid_seq | |
7be1705d LC |
1144 | #define CONSUME_PEEKED_BYTE() \ |
1145 | pt->read_pos++ | |
7b292a9d LC |
1146 | |
1147 | int byte; | |
7be1705d | 1148 | scm_t_port *pt; |
7b292a9d LC |
1149 | |
1150 | *len = 0; | |
7be1705d | 1151 | pt = SCM_PTAB_ENTRY (port); |
7b292a9d LC |
1152 | |
1153 | byte = scm_get_byte_or_eof (port); | |
1154 | if (byte == EOF) | |
1155 | { | |
1156 | *codepoint = EOF; | |
1157 | return 0; | |
1158 | } | |
1159 | ||
1160 | buf[0] = (scm_t_uint8) byte; | |
1161 | *len = 1; | |
1162 | ||
1163 | if (buf[0] <= 0x7f) | |
1164 | /* 1-byte form. */ | |
1165 | *codepoint = buf[0]; | |
1166 | else if (buf[0] >= 0xc2 && buf[0] <= 0xdf) | |
1167 | { | |
1168 | /* 2-byte form. */ | |
7be1705d | 1169 | byte = scm_peek_byte_or_eof (port); |
7b292a9d LC |
1170 | ASSERT_NOT_EOF (byte); |
1171 | ||
7b292a9d LC |
1172 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80)) |
1173 | goto invalid_seq; | |
1174 | ||
7be1705d LC |
1175 | CONSUME_PEEKED_BYTE (); |
1176 | buf[1] = (scm_t_uint8) byte; | |
1177 | *len = 2; | |
1178 | ||
7b292a9d LC |
1179 | *codepoint = ((scm_t_wchar) buf[0] & 0x1f) << 6UL |
1180 | | (buf[1] & 0x3f); | |
1181 | } | |
1182 | else if ((buf[0] & 0xf0) == 0xe0) | |
1183 | { | |
1184 | /* 3-byte form. */ | |
7be1705d LC |
1185 | byte = scm_peek_byte_or_eof (port); |
1186 | ASSERT_NOT_EOF (byte); | |
7b292a9d LC |
1187 | |
1188 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80 | |
1189 | || (buf[0] == 0xe0 && byte < 0xa0) | |
1190 | || (buf[0] == 0xed && byte > 0x9f))) | |
7be1705d | 1191 | goto invalid_seq; |
7b292a9d | 1192 | |
7be1705d LC |
1193 | CONSUME_PEEKED_BYTE (); |
1194 | buf[1] = (scm_t_uint8) byte; | |
1195 | *len = 2; | |
7b292a9d | 1196 | |
7be1705d | 1197 | byte = scm_peek_byte_or_eof (port); |
7b292a9d LC |
1198 | ASSERT_NOT_EOF (byte); |
1199 | ||
7b292a9d LC |
1200 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80)) |
1201 | goto invalid_seq; | |
1202 | ||
7be1705d LC |
1203 | CONSUME_PEEKED_BYTE (); |
1204 | buf[2] = (scm_t_uint8) byte; | |
1205 | *len = 3; | |
1206 | ||
7b292a9d LC |
1207 | *codepoint = ((scm_t_wchar) buf[0] & 0x0f) << 12UL |
1208 | | ((scm_t_wchar) buf[1] & 0x3f) << 6UL | |
1209 | | (buf[2] & 0x3f); | |
1210 | } | |
1211 | else if (buf[0] >= 0xf0 && buf[0] <= 0xf4) | |
1212 | { | |
1213 | /* 4-byte form. */ | |
7be1705d | 1214 | byte = scm_peek_byte_or_eof (port); |
7b292a9d LC |
1215 | ASSERT_NOT_EOF (byte); |
1216 | ||
7b292a9d LC |
1217 | if (SCM_UNLIKELY (((byte & 0xc0) != 0x80) |
1218 | || (buf[0] == 0xf0 && byte < 0x90) | |
1219 | || (buf[0] == 0xf4 && byte > 0x8f))) | |
7be1705d | 1220 | goto invalid_seq; |
7b292a9d | 1221 | |
7be1705d LC |
1222 | CONSUME_PEEKED_BYTE (); |
1223 | buf[1] = (scm_t_uint8) byte; | |
1224 | *len = 2; | |
1225 | ||
1226 | byte = scm_peek_byte_or_eof (port); | |
7b292a9d LC |
1227 | ASSERT_NOT_EOF (byte); |
1228 | ||
7be1705d LC |
1229 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80)) |
1230 | goto invalid_seq; | |
1231 | ||
1232 | CONSUME_PEEKED_BYTE (); | |
7b292a9d LC |
1233 | buf[2] = (scm_t_uint8) byte; |
1234 | *len = 3; | |
1235 | ||
7be1705d | 1236 | byte = scm_peek_byte_or_eof (port); |
7b292a9d LC |
1237 | ASSERT_NOT_EOF (byte); |
1238 | ||
7b292a9d LC |
1239 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80)) |
1240 | goto invalid_seq; | |
1241 | ||
7be1705d LC |
1242 | CONSUME_PEEKED_BYTE (); |
1243 | buf[3] = (scm_t_uint8) byte; | |
1244 | *len = 4; | |
1245 | ||
7b292a9d LC |
1246 | *codepoint = ((scm_t_wchar) buf[0] & 0x07) << 18UL |
1247 | | ((scm_t_wchar) buf[1] & 0x3f) << 12UL | |
1248 | | ((scm_t_wchar) buf[2] & 0x3f) << 6UL | |
1249 | | (buf[3] & 0x3f); | |
1250 | } | |
1251 | else | |
1252 | goto invalid_seq; | |
1253 | ||
1254 | return 0; | |
1255 | ||
1256 | invalid_seq: | |
7be1705d LC |
1257 | /* Here we could choose the consume the faulty byte when it's not a |
1258 | valid starting byte, but it's not a requirement. What Section 3.9 | |
1259 | of Unicode 6.0.0 mandates, though, is to not consume a byte that | |
1260 | would otherwise be a valid starting byte. */ | |
1261 | ||
7b292a9d LC |
1262 | return EILSEQ; |
1263 | ||
7be1705d | 1264 | #undef CONSUME_PEEKED_BYTE |
7b292a9d LC |
1265 | #undef ASSERT_NOT_EOF |
1266 | } | |
1267 | ||
1268 | /* Likewise, read a byte sequence from PORT, passing it through its | |
1269 | input conversion descriptor. */ | |
1270 | static int | |
1271 | get_iconv_codepoint (SCM port, scm_t_wchar *codepoint, | |
1272 | char buf[SCM_MBCHAR_BUF_SIZE], size_t *len) | |
1273 | { | |
1274 | scm_t_port *pt; | |
f4bc4e59 LC |
1275 | int err, byte_read; |
1276 | size_t bytes_consumed, output_size; | |
f4bc4e59 LC |
1277 | char *output; |
1278 | scm_t_uint8 utf8_buf[SCM_MBCHAR_BUF_SIZE]; | |
889975e5 | 1279 | |
7b292a9d | 1280 | pt = SCM_PTAB_ENTRY (port); |
889975e5 | 1281 | |
f4bc4e59 LC |
1282 | for (output_size = 0, output = (char *) utf8_buf, |
1283 | bytes_consumed = 0, err = 0; | |
1284 | err == 0 && output_size == 0 | |
1285 | && (bytes_consumed == 0 || byte_read != EOF); | |
1286 | bytes_consumed++) | |
63479112 | 1287 | { |
f4bc4e59 LC |
1288 | char *input; |
1289 | size_t input_left, output_left, done; | |
889975e5 | 1290 | |
f4bc4e59 LC |
1291 | byte_read = scm_get_byte_or_eof (port); |
1292 | if (byte_read == EOF) | |
889975e5 | 1293 | { |
f4bc4e59 | 1294 | if (bytes_consumed == 0) |
c62da8f8 LC |
1295 | { |
1296 | *codepoint = (scm_t_wchar) EOF; | |
1297 | *len = 0; | |
1298 | return 0; | |
1299 | } | |
f4bc4e59 LC |
1300 | else |
1301 | continue; | |
889975e5 MG |
1302 | } |
1303 | ||
f4bc4e59 | 1304 | buf[bytes_consumed] = byte_read; |
889975e5 | 1305 | |
f4bc4e59 LC |
1306 | input = buf; |
1307 | input_left = bytes_consumed + 1; | |
1308 | output_left = sizeof (utf8_buf); | |
889975e5 | 1309 | |
f4bc4e59 LC |
1310 | done = iconv (pt->input_cd, &input, &input_left, |
1311 | &output, &output_left); | |
1312 | if (done == (size_t) -1) | |
889975e5 | 1313 | { |
f4bc4e59 LC |
1314 | err = errno; |
1315 | if (err == EINVAL) | |
1316 | /* Missing input: keep trying. */ | |
1317 | err = 0; | |
889975e5 | 1318 | } |
f4bc4e59 LC |
1319 | else |
1320 | output_size = sizeof (utf8_buf) - output_left; | |
889975e5 MG |
1321 | } |
1322 | ||
a42d7971 LC |
1323 | if (SCM_UNLIKELY (output_size == 0)) |
1324 | /* An unterminated sequence. */ | |
1325 | err = EILSEQ; | |
7b292a9d | 1326 | else if (SCM_LIKELY (err == 0)) |
cc540d0b | 1327 | { |
7b292a9d LC |
1328 | /* Convert the UTF8_BUF sequence to a Unicode code point. */ |
1329 | *codepoint = utf8_to_codepoint (utf8_buf, output_size); | |
1330 | *len = bytes_consumed; | |
1331 | } | |
cc540d0b | 1332 | |
7b292a9d LC |
1333 | return err; |
1334 | } | |
c62da8f8 | 1335 | |
7b292a9d LC |
1336 | /* Read a codepoint from PORT and return it in *CODEPOINT. Fill BUF |
1337 | with the byte representation of the codepoint in PORT's encoding, and | |
1338 | set *LEN to the length in bytes of that representation. Return 0 on | |
1339 | success and an errno value on error. */ | |
1340 | static int | |
1341 | get_codepoint (SCM port, scm_t_wchar *codepoint, | |
1342 | char buf[SCM_MBCHAR_BUF_SIZE], size_t *len) | |
1343 | { | |
1344 | int err; | |
1345 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
1346 | ||
1347 | if (pt->input_cd == (iconv_t) -1) | |
1348 | /* Initialize the conversion descriptors, if needed. */ | |
1349 | scm_i_set_port_encoding_x (port, pt->encoding); | |
1350 | ||
1351 | /* FIXME: In 2.1, add a flag to determine whether a port is UTF-8. */ | |
1352 | if (pt->input_cd == (iconv_t) -1) | |
1353 | err = get_utf8_codepoint (port, codepoint, (scm_t_uint8 *) buf, len); | |
cc540d0b | 1354 | else |
7b292a9d LC |
1355 | err = get_iconv_codepoint (port, codepoint, buf, len); |
1356 | ||
1357 | if (SCM_LIKELY (err == 0)) | |
1358 | update_port_lf (*codepoint, port); | |
1359 | else if (pt->ilseq_handler == SCM_ICONVEH_QUESTION_MARK) | |
a42d7971 | 1360 | { |
7b292a9d LC |
1361 | *codepoint = '?'; |
1362 | err = 0; | |
a42d7971 LC |
1363 | update_port_lf (*codepoint, port); |
1364 | } | |
889975e5 | 1365 | |
c62da8f8 | 1366 | return err; |
889975e5 MG |
1367 | } |
1368 | ||
fd5eec2b LC |
1369 | /* Read a codepoint from PORT and return it. */ |
1370 | scm_t_wchar | |
1371 | scm_getc (SCM port) | |
c62da8f8 | 1372 | #define FUNC_NAME "scm_getc" |
fd5eec2b | 1373 | { |
c62da8f8 | 1374 | int err; |
fd5eec2b | 1375 | size_t len; |
c62da8f8 | 1376 | scm_t_wchar codepoint; |
fd5eec2b LC |
1377 | char buf[SCM_MBCHAR_BUF_SIZE]; |
1378 | ||
c62da8f8 LC |
1379 | err = get_codepoint (port, &codepoint, buf, &len); |
1380 | if (SCM_UNLIKELY (err != 0)) | |
1381 | /* At this point PORT should point past the invalid encoding, as per | |
1382 | R6RS-lib Section 8.2.4. */ | |
1383 | scm_decoding_error (FUNC_NAME, err, "input decoding error", port); | |
1384 | ||
1385 | return codepoint; | |
fd5eec2b | 1386 | } |
c62da8f8 | 1387 | #undef FUNC_NAME |
889975e5 | 1388 | |
5c070ca7 | 1389 | /* this should only be called when the read buffer is empty. it |
affc96b5 | 1390 | tries to refill the read buffer. it returns the first char from |
5c070ca7 | 1391 | the port, which is either EOF or *(pt->read_pos). */ |
6c951427 | 1392 | int |
affc96b5 | 1393 | scm_fill_input (SCM port) |
6c951427 | 1394 | { |
92c2555f | 1395 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
283a1a0e | 1396 | |
b5cb4464 NJ |
1397 | assert (pt->read_pos == pt->read_end); |
1398 | ||
6c951427 GH |
1399 | if (pt->read_buf == pt->putback_buf) |
1400 | { | |
1401 | /* finished reading put-back chars. */ | |
1402 | pt->read_buf = pt->saved_read_buf; | |
1403 | pt->read_pos = pt->saved_read_pos; | |
1404 | pt->read_end = pt->saved_read_end; | |
1405 | pt->read_buf_size = pt->saved_read_buf_size; | |
1406 | if (pt->read_pos < pt->read_end) | |
5c070ca7 | 1407 | return *(pt->read_pos); |
6c951427 | 1408 | } |
62bd5d66 | 1409 | return SCM_PORT_DESCRIPTOR (port)->fill_input (port); |
6c951427 GH |
1410 | } |
1411 | ||
3cb988bd | 1412 | |
6fe692e9 MD |
1413 | /* scm_lfwrite |
1414 | * | |
53802ea8 MV |
1415 | * This function differs from scm_c_write; it updates port line and |
1416 | * column. */ | |
6fe692e9 | 1417 | |
9c44cd45 | 1418 | void |
1be6b49c | 1419 | scm_lfwrite (const char *ptr, size_t size, SCM port) |
ee149d03 | 1420 | { |
92c2555f | 1421 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
62bd5d66 | 1422 | scm_t_ptob_descriptor *ptob = SCM_PORT_DESCRIPTOR (port); |
3e2043c4 | 1423 | |
840ae05d | 1424 | if (pt->rw_active == SCM_PORT_READ) |
affc96b5 | 1425 | scm_end_input (port); |
283a1a0e | 1426 | |
31703ab8 | 1427 | ptob->write (port, ptr, size); |
840ae05d | 1428 | |
9c44cd45 MG |
1429 | for (; size; ptr++, size--) |
1430 | update_port_lf ((scm_t_wchar) (unsigned char) *ptr, port); | |
1431 | ||
1432 | if (pt->rw_random) | |
1433 | pt->rw_active = SCM_PORT_WRITE; | |
1434 | } | |
1435 | ||
4325620f | 1436 | /* Write STR to PORT from START inclusive to END exclusive. */ |
9c44cd45 MG |
1437 | void |
1438 | scm_lfwrite_substr (SCM str, size_t start, size_t end, SCM port) | |
1439 | { | |
9c44cd45 | 1440 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
9c44cd45 MG |
1441 | |
1442 | if (pt->rw_active == SCM_PORT_READ) | |
1443 | scm_end_input (port); | |
1444 | ||
4325620f LC |
1445 | if (end == (size_t) -1) |
1446 | end = scm_i_string_length (str); | |
9c44cd45 | 1447 | |
4325620f | 1448 | scm_display (scm_c_substring (str, start, end), port); |
53802ea8 | 1449 | |
840ae05d JB |
1450 | if (pt->rw_random) |
1451 | pt->rw_active = SCM_PORT_WRITE; | |
ee149d03 | 1452 | } |
3cb988bd | 1453 | |
6fe692e9 MD |
1454 | /* scm_c_read |
1455 | * | |
1456 | * Used by an application to read arbitrary number of bytes from an | |
1457 | * SCM port. Same semantics as libc read, except that scm_c_read only | |
1458 | * returns less than SIZE bytes if at end-of-file. | |
1459 | * | |
1460 | * Warning: Doesn't update port line and column counts! */ | |
1461 | ||
b5cb4464 NJ |
1462 | /* This structure, and the following swap_buffer function, are used |
1463 | for temporarily swapping a port's own read buffer, and the buffer | |
1464 | that the caller of scm_c_read provides. */ | |
1465 | struct port_and_swap_buffer | |
1466 | { | |
1467 | scm_t_port *pt; | |
1468 | unsigned char *buffer; | |
1469 | size_t size; | |
1470 | }; | |
1471 | ||
1472 | static void | |
1473 | swap_buffer (void *data) | |
1474 | { | |
1475 | struct port_and_swap_buffer *psb = (struct port_and_swap_buffer *) data; | |
1476 | unsigned char *old_buf = psb->pt->read_buf; | |
1477 | size_t old_size = psb->pt->read_buf_size; | |
1478 | ||
1479 | /* Make the port use (buffer, size) from the struct. */ | |
1480 | psb->pt->read_pos = psb->pt->read_buf = psb->pt->read_end = psb->buffer; | |
1481 | psb->pt->read_buf_size = psb->size; | |
1482 | ||
1483 | /* Save the port's old (buffer, size) in the struct. */ | |
1484 | psb->buffer = old_buf; | |
1485 | psb->size = old_size; | |
1486 | } | |
1487 | ||
1be6b49c ML |
1488 | size_t |
1489 | scm_c_read (SCM port, void *buffer, size_t size) | |
693758d5 | 1490 | #define FUNC_NAME "scm_c_read" |
6fe692e9 | 1491 | { |
693758d5 | 1492 | scm_t_port *pt; |
1be6b49c | 1493 | size_t n_read = 0, n_available; |
b5cb4464 | 1494 | struct port_and_swap_buffer psb; |
6fe692e9 | 1495 | |
693758d5 LC |
1496 | SCM_VALIDATE_OPINPORT (1, port); |
1497 | ||
1498 | pt = SCM_PTAB_ENTRY (port); | |
6fe692e9 | 1499 | if (pt->rw_active == SCM_PORT_WRITE) |
62bd5d66 | 1500 | SCM_PORT_DESCRIPTOR (port)->flush (port); |
6fe692e9 MD |
1501 | |
1502 | if (pt->rw_random) | |
1503 | pt->rw_active = SCM_PORT_READ; | |
1504 | ||
b5cb4464 NJ |
1505 | /* Take bytes first from the port's read buffer. */ |
1506 | if (pt->read_pos < pt->read_end) | |
6fe692e9 | 1507 | { |
b5cb4464 | 1508 | n_available = min (size, pt->read_end - pt->read_pos); |
6fe692e9 | 1509 | memcpy (buffer, pt->read_pos, n_available); |
910d1e40 | 1510 | buffer = (char *) buffer + n_available; |
6fe692e9 MD |
1511 | pt->read_pos += n_available; |
1512 | n_read += n_available; | |
6fe692e9 | 1513 | size -= n_available; |
6fe692e9 MD |
1514 | } |
1515 | ||
b5cb4464 NJ |
1516 | /* Avoid the scm_dynwind_* costs if we now have enough data. */ |
1517 | if (size == 0) | |
1518 | return n_read; | |
1519 | ||
1520 | /* Now we will call scm_fill_input repeatedly until we have read the | |
1521 | requested number of bytes. (Note that a single scm_fill_input | |
1522 | call does not guarantee to fill the whole of the port's read | |
6d227556 | 1523 | buffer.) */ |
75192345 | 1524 | if (pt->read_buf_size <= 1 && pt->encoding == NULL) |
b5cb4464 | 1525 | { |
6d227556 NJ |
1526 | /* The port that we are reading from is unbuffered - i.e. does |
1527 | not have its own persistent buffer - but we have a buffer, | |
1528 | provided by our caller, that is the right size for the data | |
1529 | that is wanted. For the following scm_fill_input calls, | |
1530 | therefore, we use the buffer in hand as the port's read | |
1531 | buffer. | |
1532 | ||
1533 | We need to make sure that the port's normal (1 byte) buffer | |
1534 | is reinstated in case one of the scm_fill_input () calls | |
1535 | throws an exception; we use the scm_dynwind_* API to achieve | |
75192345 MG |
1536 | that. |
1537 | ||
1538 | A consequence of this optimization is that the fill_input | |
1539 | functions can't unget characters. That'll push data to the | |
1540 | pushback buffer instead of this psb buffer. */ | |
1541 | #if SCM_DEBUG == 1 | |
1542 | unsigned char *pback = pt->putback_buf; | |
1543 | #endif | |
6d227556 NJ |
1544 | psb.pt = pt; |
1545 | psb.buffer = buffer; | |
1546 | psb.size = size; | |
1547 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); | |
1548 | scm_dynwind_rewind_handler (swap_buffer, &psb, SCM_F_WIND_EXPLICITLY); | |
1549 | scm_dynwind_unwind_handler (swap_buffer, &psb, SCM_F_WIND_EXPLICITLY); | |
1550 | ||
1551 | /* Call scm_fill_input until we have all the bytes that we need, | |
1552 | or we hit EOF. */ | |
1553 | while (pt->read_buf_size && (scm_fill_input (port) != EOF)) | |
1554 | { | |
1555 | pt->read_buf_size -= (pt->read_end - pt->read_pos); | |
1556 | pt->read_pos = pt->read_buf = pt->read_end; | |
1557 | } | |
75192345 MG |
1558 | #if SCM_DEBUG == 1 |
1559 | if (pback != pt->putback_buf | |
1560 | || pt->read_buf - (unsigned char *) buffer < 0) | |
1561 | scm_misc_error (FUNC_NAME, | |
1562 | "scm_c_read must not call a fill function that pushes " | |
1563 | "back characters onto an unbuffered port", SCM_EOL); | |
1564 | #endif | |
6d227556 | 1565 | n_read += pt->read_buf - (unsigned char *) buffer; |
75192345 | 1566 | |
6d227556 NJ |
1567 | /* Reinstate the port's normal buffer. */ |
1568 | scm_dynwind_end (); | |
1569 | } | |
1570 | else | |
1571 | { | |
1572 | /* The port has its own buffer. It is important that we use it, | |
1573 | even if it happens to be smaller than our caller's buffer, so | |
1574 | that a custom port implementation's entry points (in | |
1575 | particular, fill_input) can rely on the buffer always being | |
1576 | the same as they first set up. */ | |
1577 | while (size && (scm_fill_input (port) != EOF)) | |
1578 | { | |
1579 | n_available = min (size, pt->read_end - pt->read_pos); | |
1580 | memcpy (buffer, pt->read_pos, n_available); | |
1581 | buffer = (char *) buffer + n_available; | |
1582 | pt->read_pos += n_available; | |
1583 | n_read += n_available; | |
1584 | size -= n_available; | |
1585 | } | |
1586 | } | |
6fe692e9 | 1587 | |
b5cb4464 | 1588 | return n_read; |
6fe692e9 | 1589 | } |
693758d5 | 1590 | #undef FUNC_NAME |
6fe692e9 MD |
1591 | |
1592 | /* scm_c_write | |
1593 | * | |
1594 | * Used by an application to write arbitrary number of bytes to an SCM | |
1595 | * port. Similar semantics as libc write. However, unlike libc | |
1596 | * write, scm_c_write writes the requested number of bytes and has no | |
1597 | * return value. | |
1598 | * | |
1599 | * Warning: Doesn't update port line and column counts! | |
1600 | */ | |
1601 | ||
693758d5 | 1602 | void |
1be6b49c | 1603 | scm_c_write (SCM port, const void *ptr, size_t size) |
693758d5 | 1604 | #define FUNC_NAME "scm_c_write" |
6fe692e9 | 1605 | { |
693758d5 LC |
1606 | scm_t_port *pt; |
1607 | scm_t_ptob_descriptor *ptob; | |
1608 | ||
1609 | SCM_VALIDATE_OPOUTPORT (1, port); | |
1610 | ||
1611 | pt = SCM_PTAB_ENTRY (port); | |
62bd5d66 | 1612 | ptob = SCM_PORT_DESCRIPTOR (port); |
6fe692e9 MD |
1613 | |
1614 | if (pt->rw_active == SCM_PORT_READ) | |
1615 | scm_end_input (port); | |
1616 | ||
1617 | ptob->write (port, ptr, size); | |
1618 | ||
1619 | if (pt->rw_random) | |
1620 | pt->rw_active = SCM_PORT_WRITE; | |
1621 | } | |
693758d5 | 1622 | #undef FUNC_NAME |
3cb988bd | 1623 | |
fca43887 | 1624 | void |
a284e297 | 1625 | scm_flush (SCM port) |
ee149d03 | 1626 | { |
62bd5d66 | 1627 | SCM_PORT_DESCRIPTOR (port)->flush (port); |
ee149d03 JB |
1628 | } |
1629 | ||
283a1a0e | 1630 | void |
a284e297 | 1631 | scm_end_input (SCM port) |
283a1a0e | 1632 | { |
c014a02e | 1633 | long offset; |
92c2555f | 1634 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
283a1a0e GH |
1635 | |
1636 | if (pt->read_buf == pt->putback_buf) | |
1637 | { | |
1638 | offset = pt->read_end - pt->read_pos; | |
1639 | pt->read_buf = pt->saved_read_buf; | |
1640 | pt->read_pos = pt->saved_read_pos; | |
1641 | pt->read_end = pt->saved_read_end; | |
1642 | pt->read_buf_size = pt->saved_read_buf_size; | |
1643 | } | |
1644 | else | |
1645 | offset = 0; | |
1646 | ||
62bd5d66 | 1647 | SCM_PORT_DESCRIPTOR (port)->end_input (port, offset); |
283a1a0e GH |
1648 | } |
1649 | ||
ee149d03 JB |
1650 | \f |
1651 | ||
1652 | ||
1653 | void | |
889975e5 MG |
1654 | scm_unget_byte (int c, SCM port) |
1655 | #define FUNC_NAME "scm_unget_byte" | |
ee149d03 | 1656 | { |
92c2555f | 1657 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
840ae05d | 1658 | |
6c951427 GH |
1659 | if (pt->read_buf == pt->putback_buf) |
1660 | /* already using the put-back buffer. */ | |
1661 | { | |
1662 | /* enlarge putback_buf if necessary. */ | |
1663 | if (pt->read_end == pt->read_buf + pt->read_buf_size | |
1664 | && pt->read_buf == pt->read_pos) | |
1665 | { | |
1be6b49c | 1666 | size_t new_size = pt->read_buf_size * 2; |
c6c79933 | 1667 | unsigned char *tmp = (unsigned char *) |
4c9419ac MV |
1668 | scm_gc_realloc (pt->putback_buf, pt->read_buf_size, new_size, |
1669 | "putback buffer"); | |
6c951427 | 1670 | |
6c951427 GH |
1671 | pt->read_pos = pt->read_buf = pt->putback_buf = tmp; |
1672 | pt->read_end = pt->read_buf + pt->read_buf_size; | |
1673 | pt->read_buf_size = pt->putback_buf_size = new_size; | |
1674 | } | |
1675 | ||
1676 | /* shift any existing bytes to buffer + 1. */ | |
1677 | if (pt->read_pos == pt->read_end) | |
1678 | pt->read_end = pt->read_buf + 1; | |
1679 | else if (pt->read_pos != pt->read_buf + 1) | |
1680 | { | |
1681 | int count = pt->read_end - pt->read_pos; | |
1682 | ||
1683 | memmove (pt->read_buf + 1, pt->read_pos, count); | |
1684 | pt->read_end = pt->read_buf + 1 + count; | |
1685 | } | |
1686 | ||
1687 | pt->read_pos = pt->read_buf; | |
1688 | } | |
1689 | else | |
1690 | /* switch to the put-back buffer. */ | |
1691 | { | |
1692 | if (pt->putback_buf == NULL) | |
1693 | { | |
c357d546 | 1694 | pt->putback_buf |
92d8fd32 LC |
1695 | = (unsigned char *) scm_gc_malloc_pointerless |
1696 | (SCM_INITIAL_PUTBACK_BUF_SIZE, "putback buffer"); | |
6c951427 GH |
1697 | pt->putback_buf_size = SCM_INITIAL_PUTBACK_BUF_SIZE; |
1698 | } | |
1699 | ||
1700 | pt->saved_read_buf = pt->read_buf; | |
1701 | pt->saved_read_pos = pt->read_pos; | |
1702 | pt->saved_read_end = pt->read_end; | |
1703 | pt->saved_read_buf_size = pt->read_buf_size; | |
1704 | ||
1705 | pt->read_pos = pt->read_buf = pt->putback_buf; | |
1706 | pt->read_end = pt->read_buf + 1; | |
1707 | pt->read_buf_size = pt->putback_buf_size; | |
1708 | } | |
1709 | ||
1710 | *pt->read_buf = c; | |
ee149d03 | 1711 | |
840ae05d JB |
1712 | if (pt->rw_random) |
1713 | pt->rw_active = SCM_PORT_READ; | |
889975e5 MG |
1714 | } |
1715 | #undef FUNC_NAME | |
1716 | ||
63479112 | 1717 | void |
889975e5 MG |
1718 | scm_ungetc (scm_t_wchar c, SCM port) |
1719 | #define FUNC_NAME "scm_ungetc" | |
1720 | { | |
1721 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
63479112 LC |
1722 | char *result; |
1723 | char result_buf[10]; | |
1724 | const char *encoding; | |
889975e5 MG |
1725 | size_t len; |
1726 | int i; | |
1727 | ||
63479112 LC |
1728 | if (pt->encoding != NULL) |
1729 | encoding = pt->encoding; | |
1730 | else | |
1731 | encoding = "ISO-8859-1"; | |
1732 | ||
1733 | len = sizeof (result_buf); | |
1734 | result = u32_conv_to_encoding (encoding, | |
1735 | (enum iconv_ilseq_handler) pt->ilseq_handler, | |
1736 | (uint32_t *) &c, 1, NULL, | |
1737 | result_buf, &len); | |
1738 | ||
1739 | if (SCM_UNLIKELY (result == NULL || len == 0)) | |
6851d3be LC |
1740 | scm_encoding_error (FUNC_NAME, errno, |
1741 | "conversion to port encoding failed", | |
1742 | SCM_BOOL_F, SCM_MAKE_CHAR (c)); | |
63479112 | 1743 | |
889975e5 | 1744 | for (i = len - 1; i >= 0; i--) |
63479112 LC |
1745 | scm_unget_byte (result[i], port); |
1746 | ||
1747 | if (SCM_UNLIKELY (result != result_buf)) | |
1748 | free (result); | |
840ae05d | 1749 | |
ee149d03 JB |
1750 | if (c == '\n') |
1751 | { | |
1752 | /* What should col be in this case? | |
1753 | * We'll leave it at -1. | |
1754 | */ | |
1755 | SCM_LINUM (port) -= 1; | |
1756 | } | |
1757 | else | |
1758 | SCM_COL(port) -= 1; | |
1759 | } | |
c6c79933 | 1760 | #undef FUNC_NAME |
ee149d03 JB |
1761 | |
1762 | ||
1763 | void | |
70d63753 | 1764 | scm_ungets (const char *s, int n, SCM port) |
ee149d03 JB |
1765 | { |
1766 | /* This is simple minded and inefficient, but unreading strings is | |
1767 | * probably not a common operation, and remember that line and | |
1768 | * column numbers have to be handled... | |
1769 | * | |
1770 | * Please feel free to write an optimized version! | |
1771 | */ | |
1772 | while (n--) | |
1773 | scm_ungetc (s[n], port); | |
1774 | } | |
1775 | ||
1776 | ||
3b3b36dd | 1777 | SCM_DEFINE (scm_peek_char, "peek-char", 0, 1, 0, |
1bbd0b84 | 1778 | (SCM port), |
1e6808ea MG |
1779 | "Return the next character available from @var{port},\n" |
1780 | "@emph{without} updating @var{port} to point to the following\n" | |
1781 | "character. If no more characters are available, the\n" | |
c2dfff19 KR |
1782 | "end-of-file object is returned.\n" |
1783 | "\n" | |
1784 | "The value returned by\n" | |
1e6808ea MG |
1785 | "a call to @code{peek-char} is the same as the value that would\n" |
1786 | "have been returned by a call to @code{read-char} on the same\n" | |
1787 | "port. The only difference is that the very next call to\n" | |
1788 | "@code{read-char} or @code{peek-char} on that @var{port} will\n" | |
1789 | "return the value returned by the preceding call to\n" | |
1790 | "@code{peek-char}. In particular, a call to @code{peek-char} on\n" | |
1791 | "an interactive port will hang waiting for input whenever a call\n" | |
c62da8f8 LC |
1792 | "to @code{read-char} would have hung.\n" |
1793 | "\n" | |
1794 | "As for @code{read-char}, a @code{decoding-error} may be raised\n" | |
1795 | "if such a situation occurs. However, unlike with @code{read-char},\n" | |
1796 | "@var{port} still points at the beginning of the erroneous byte\n" | |
1797 | "sequence when the error is raised.\n") | |
1bbd0b84 | 1798 | #define FUNC_NAME s_scm_peek_char |
ee149d03 | 1799 | { |
c62da8f8 | 1800 | int err; |
fd5eec2b LC |
1801 | SCM result; |
1802 | scm_t_wchar c; | |
1803 | char bytes[SCM_MBCHAR_BUF_SIZE]; | |
c62da8f8 | 1804 | long column, line, i; |
fd5eec2b LC |
1805 | size_t len; |
1806 | ||
ee149d03 | 1807 | if (SCM_UNBNDP (port)) |
9de87eea | 1808 | port = scm_current_input_port (); |
b2456dd4 | 1809 | SCM_VALIDATE_OPINPORT (1, port); |
fd5eec2b LC |
1810 | |
1811 | column = SCM_COL (port); | |
1812 | line = SCM_LINUM (port); | |
1813 | ||
c62da8f8 | 1814 | err = get_codepoint (port, &c, bytes, &len); |
fd5eec2b | 1815 | |
c62da8f8 LC |
1816 | for (i = len - 1; i >= 0; i--) |
1817 | scm_unget_byte (bytes[i], port); | |
fd5eec2b | 1818 | |
c62da8f8 LC |
1819 | SCM_COL (port) = column; |
1820 | SCM_LINUM (port) = line; | |
fd5eec2b | 1821 | |
c62da8f8 LC |
1822 | if (SCM_UNLIKELY (err != 0)) |
1823 | { | |
1824 | scm_decoding_error (FUNC_NAME, err, "input decoding error", port); | |
1825 | ||
1826 | /* Shouldn't happen since `catch' always aborts to prompt. */ | |
1827 | result = SCM_BOOL_F; | |
fd5eec2b | 1828 | } |
c62da8f8 LC |
1829 | else if (c == EOF) |
1830 | result = SCM_EOF_VAL; | |
1831 | else | |
1832 | result = SCM_MAKE_CHAR (c); | |
fd5eec2b LC |
1833 | |
1834 | return result; | |
3cb988bd | 1835 | } |
1bbd0b84 | 1836 | #undef FUNC_NAME |
3cb988bd | 1837 | |
1be4270a | 1838 | SCM_DEFINE (scm_unread_char, "unread-char", 1, 1, 0, |
1bbd0b84 | 1839 | (SCM cobj, SCM port), |
b380b885 MD |
1840 | "Place @var{char} in @var{port} so that it will be read by the\n" |
1841 | "next read operation. If called multiple times, the unread characters\n" | |
1842 | "will be read again in last-in first-out order. If @var{port} is\n" | |
1843 | "not supplied, the current input port is used.") | |
1bbd0b84 | 1844 | #define FUNC_NAME s_scm_unread_char |
0f2d19dd JB |
1845 | { |
1846 | int c; | |
1847 | ||
34d19ef6 | 1848 | SCM_VALIDATE_CHAR (1, cobj); |
0f2d19dd | 1849 | if (SCM_UNBNDP (port)) |
9de87eea | 1850 | port = scm_current_input_port (); |
b2456dd4 | 1851 | SCM_VALIDATE_OPINPORT (2, port); |
0f2d19dd | 1852 | |
7866a09b | 1853 | c = SCM_CHAR (cobj); |
0f2d19dd | 1854 | |
b7f3516f | 1855 | scm_ungetc (c, port); |
0f2d19dd JB |
1856 | return cobj; |
1857 | } | |
1bbd0b84 | 1858 | #undef FUNC_NAME |
0f2d19dd | 1859 | |
a1ec6916 | 1860 | SCM_DEFINE (scm_unread_string, "unread-string", 2, 0, 0, |
1bbd0b84 | 1861 | (SCM str, SCM port), |
b380b885 MD |
1862 | "Place the string @var{str} in @var{port} so that its characters will be\n" |
1863 | "read in subsequent read operations. If called multiple times, the\n" | |
1864 | "unread characters will be read again in last-in first-out order. If\n" | |
1865 | "@var{port} is not supplied, the current-input-port is used.") | |
1bbd0b84 | 1866 | #define FUNC_NAME s_scm_unread_string |
ee1e7e13 | 1867 | { |
889975e5 | 1868 | int n; |
34d19ef6 | 1869 | SCM_VALIDATE_STRING (1, str); |
ee1e7e13 | 1870 | if (SCM_UNBNDP (port)) |
9de87eea | 1871 | port = scm_current_input_port (); |
b2456dd4 | 1872 | SCM_VALIDATE_OPINPORT (2, port); |
ee1e7e13 | 1873 | |
889975e5 MG |
1874 | n = scm_i_string_length (str); |
1875 | ||
1876 | while (n--) | |
1877 | scm_ungetc (scm_i_string_ref (str, n), port); | |
ee1e7e13 MD |
1878 | |
1879 | return str; | |
1880 | } | |
1bbd0b84 | 1881 | #undef FUNC_NAME |
ee1e7e13 | 1882 | |
a1ec6916 | 1883 | SCM_DEFINE (scm_seek, "seek", 3, 0, 0, |
1e6808ea MG |
1884 | (SCM fd_port, SCM offset, SCM whence), |
1885 | "Sets the current position of @var{fd/port} to the integer\n" | |
1886 | "@var{offset}, which is interpreted according to the value of\n" | |
1887 | "@var{whence}.\n" | |
1888 | "\n" | |
1889 | "One of the following variables should be supplied for\n" | |
1890 | "@var{whence}:\n" | |
b380b885 MD |
1891 | "@defvar SEEK_SET\n" |
1892 | "Seek from the beginning of the file.\n" | |
1893 | "@end defvar\n" | |
1894 | "@defvar SEEK_CUR\n" | |
1895 | "Seek from the current position.\n" | |
1896 | "@end defvar\n" | |
1897 | "@defvar SEEK_END\n" | |
1898 | "Seek from the end of the file.\n" | |
1e6808ea MG |
1899 | "@end defvar\n" |
1900 | "If @var{fd/port} is a file descriptor, the underlying system\n" | |
1901 | "call is @code{lseek}. @var{port} may be a string port.\n" | |
1902 | "\n" | |
1903 | "The value returned is the new position in the file. This means\n" | |
1904 | "that the current position of a port can be obtained using:\n" | |
1905 | "@lisp\n" | |
b380b885 | 1906 | "(seek port 0 SEEK_CUR)\n" |
1e6808ea | 1907 | "@end lisp") |
1bbd0b84 | 1908 | #define FUNC_NAME s_scm_seek |
840ae05d | 1909 | { |
840ae05d JB |
1910 | int how; |
1911 | ||
1e6808ea | 1912 | fd_port = SCM_COERCE_OUTPORT (fd_port); |
840ae05d | 1913 | |
a55c2b68 | 1914 | how = scm_to_int (whence); |
840ae05d | 1915 | if (how != SEEK_SET && how != SEEK_CUR && how != SEEK_END) |
1bbd0b84 | 1916 | SCM_OUT_OF_RANGE (3, whence); |
23f2b9a3 | 1917 | |
0a94eb00 | 1918 | if (SCM_OPPORTP (fd_port)) |
840ae05d | 1919 | { |
62bd5d66 | 1920 | scm_t_ptob_descriptor *ptob = SCM_PORT_DESCRIPTOR (fd_port); |
f1ce9199 LC |
1921 | off_t_or_off64_t off = scm_to_off_t_or_off64_t (offset); |
1922 | off_t_or_off64_t rv; | |
840ae05d JB |
1923 | |
1924 | if (!ptob->seek) | |
1bbd0b84 | 1925 | SCM_MISC_ERROR ("port is not seekable", |
1e6808ea | 1926 | scm_cons (fd_port, SCM_EOL)); |
840ae05d | 1927 | else |
1e6808ea | 1928 | rv = ptob->seek (fd_port, off, how); |
f1ce9199 | 1929 | return scm_from_off_t_or_off64_t (rv); |
840ae05d JB |
1930 | } |
1931 | else /* file descriptor?. */ | |
1932 | { | |
23f2b9a3 KR |
1933 | off_t_or_off64_t off = scm_to_off_t_or_off64_t (offset); |
1934 | off_t_or_off64_t rv; | |
1935 | rv = lseek_or_lseek64 (scm_to_int (fd_port), off, how); | |
840ae05d | 1936 | if (rv == -1) |
1bbd0b84 | 1937 | SCM_SYSERROR; |
23f2b9a3 | 1938 | return scm_from_off_t_or_off64_t (rv); |
840ae05d | 1939 | } |
840ae05d | 1940 | } |
1bbd0b84 | 1941 | #undef FUNC_NAME |
840ae05d | 1942 | |
8ab3d8a0 KR |
1943 | #ifndef O_BINARY |
1944 | #define O_BINARY 0 | |
1945 | #endif | |
1946 | ||
1947 | /* Mingw has ftruncate(), perhaps implemented above using chsize, but | |
1948 | doesn't have the filename version truncate(), hence this code. */ | |
1949 | #if HAVE_FTRUNCATE && ! HAVE_TRUNCATE | |
1950 | static int | |
1951 | truncate (const char *file, off_t length) | |
82893676 | 1952 | { |
8ab3d8a0 KR |
1953 | int ret, fdes; |
1954 | ||
1955 | fdes = open (file, O_BINARY | O_WRONLY); | |
1956 | if (fdes == -1) | |
1957 | return -1; | |
1958 | ||
1959 | ret = ftruncate (fdes, length); | |
1960 | if (ret == -1) | |
82893676 | 1961 | { |
8ab3d8a0 | 1962 | int save_errno = errno; |
82893676 | 1963 | close (fdes); |
8ab3d8a0 KR |
1964 | errno = save_errno; |
1965 | return -1; | |
82893676 | 1966 | } |
8ab3d8a0 KR |
1967 | |
1968 | return close (fdes); | |
82893676 | 1969 | } |
8ab3d8a0 | 1970 | #endif /* HAVE_FTRUNCATE && ! HAVE_TRUNCATE */ |
82893676 | 1971 | |
a1ec6916 | 1972 | SCM_DEFINE (scm_truncate_file, "truncate-file", 1, 1, 0, |
1bbd0b84 | 1973 | (SCM object, SCM length), |
8ab3d8a0 KR |
1974 | "Truncate @var{file} to @var{length} bytes. @var{file} can be a\n" |
1975 | "filename string, a port object, or an integer file descriptor.\n" | |
1976 | "The return value is unspecified.\n" | |
1977 | "\n" | |
1978 | "For a port or file descriptor @var{length} can be omitted, in\n" | |
1979 | "which case the file is truncated at the current position (per\n" | |
1980 | "@code{ftell} above).\n" | |
1981 | "\n" | |
1982 | "On most systems a file can be extended by giving a length\n" | |
1983 | "greater than the current size, but this is not mandatory in the\n" | |
1984 | "POSIX standard.") | |
1bbd0b84 | 1985 | #define FUNC_NAME s_scm_truncate_file |
840ae05d | 1986 | { |
69bc9ff3 | 1987 | int rv; |
69bc9ff3 | 1988 | |
2b829bbb KR |
1989 | /* "object" can be a port, fdes or filename. |
1990 | ||
1991 | Negative "length" makes no sense, but it's left to truncate() or | |
1992 | ftruncate() to give back an error for that (normally EINVAL). | |
1993 | */ | |
840ae05d | 1994 | |
840ae05d JB |
1995 | if (SCM_UNBNDP (length)) |
1996 | { | |
69bc9ff3 | 1997 | /* must supply length if object is a filename. */ |
7f9994d9 | 1998 | if (scm_is_string (object)) |
34d19ef6 | 1999 | SCM_MISC_ERROR("must supply length if OBJECT is a filename", SCM_EOL); |
69bc9ff3 | 2000 | |
e11e83f3 | 2001 | length = scm_seek (object, SCM_INUM0, scm_from_int (SEEK_CUR)); |
840ae05d | 2002 | } |
3fe6190f | 2003 | |
69bc9ff3 | 2004 | object = SCM_COERCE_OUTPORT (object); |
e11e83f3 | 2005 | if (scm_is_integer (object)) |
69bc9ff3 | 2006 | { |
23f2b9a3 KR |
2007 | off_t_or_off64_t c_length = scm_to_off_t_or_off64_t (length); |
2008 | SCM_SYSCALL (rv = ftruncate_or_ftruncate64 (scm_to_int (object), | |
2009 | c_length)); | |
69bc9ff3 | 2010 | } |
0c95b57d | 2011 | else if (SCM_OPOUTPORTP (object)) |
69bc9ff3 | 2012 | { |
f1ce9199 | 2013 | off_t_or_off64_t c_length = scm_to_off_t_or_off64_t (length); |
92c2555f | 2014 | scm_t_port *pt = SCM_PTAB_ENTRY (object); |
62bd5d66 | 2015 | scm_t_ptob_descriptor *ptob = SCM_PORT_DESCRIPTOR (object); |
69bc9ff3 | 2016 | |
affc96b5 | 2017 | if (!ptob->truncate) |
1bbd0b84 | 2018 | SCM_MISC_ERROR ("port is not truncatable", SCM_EOL); |
69bc9ff3 | 2019 | if (pt->rw_active == SCM_PORT_READ) |
affc96b5 | 2020 | scm_end_input (object); |
69bc9ff3 | 2021 | else if (pt->rw_active == SCM_PORT_WRITE) |
affc96b5 | 2022 | ptob->flush (object); |
69bc9ff3 | 2023 | |
affc96b5 | 2024 | ptob->truncate (object, c_length); |
69bc9ff3 GH |
2025 | rv = 0; |
2026 | } | |
2027 | else | |
2028 | { | |
2b829bbb | 2029 | off_t_or_off64_t c_length = scm_to_off_t_or_off64_t (length); |
7f9994d9 MV |
2030 | char *str = scm_to_locale_string (object); |
2031 | int eno; | |
2b829bbb | 2032 | SCM_SYSCALL (rv = truncate_or_truncate64 (str, c_length)); |
7f9994d9 MV |
2033 | eno = errno; |
2034 | free (str); | |
2035 | errno = eno; | |
69bc9ff3 GH |
2036 | } |
2037 | if (rv == -1) | |
1bbd0b84 | 2038 | SCM_SYSERROR; |
840ae05d JB |
2039 | return SCM_UNSPECIFIED; |
2040 | } | |
1bbd0b84 | 2041 | #undef FUNC_NAME |
840ae05d | 2042 | |
a1ec6916 | 2043 | SCM_DEFINE (scm_port_line, "port-line", 1, 0, 0, |
1bbd0b84 | 2044 | (SCM port), |
a150979d KR |
2045 | "Return the current line number for @var{port}.\n" |
2046 | "\n" | |
2047 | "The first line of a file is 0. But you might want to add 1\n" | |
2048 | "when printing line numbers, since starting from 1 is\n" | |
2049 | "traditional in error messages, and likely to be more natural to\n" | |
2050 | "non-programmers.") | |
1bbd0b84 | 2051 | #define FUNC_NAME s_scm_port_line |
0f2d19dd | 2052 | { |
78446828 | 2053 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 2054 | SCM_VALIDATE_OPENPORT (1, port); |
651f2cd2 | 2055 | return scm_from_long (SCM_LINUM (port)); |
0f2d19dd | 2056 | } |
1bbd0b84 | 2057 | #undef FUNC_NAME |
0f2d19dd | 2058 | |
a1ec6916 | 2059 | SCM_DEFINE (scm_set_port_line_x, "set-port-line!", 2, 0, 0, |
1bbd0b84 | 2060 | (SCM port, SCM line), |
a150979d KR |
2061 | "Set the current line number for @var{port} to @var{line}. The\n" |
2062 | "first line of a file is 0.") | |
1bbd0b84 | 2063 | #define FUNC_NAME s_scm_set_port_line_x |
d043d8c2 | 2064 | { |
360fc44c | 2065 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 2066 | SCM_VALIDATE_OPENPORT (1, port); |
651f2cd2 | 2067 | SCM_PTAB_ENTRY (port)->line_number = scm_to_long (line); |
564478fd | 2068 | return SCM_UNSPECIFIED; |
d043d8c2 | 2069 | } |
1bbd0b84 | 2070 | #undef FUNC_NAME |
d043d8c2 | 2071 | |
a1ec6916 | 2072 | SCM_DEFINE (scm_port_column, "port-column", 1, 0, 0, |
1bbd0b84 | 2073 | (SCM port), |
a150979d KR |
2074 | "Return the current column number of @var{port}.\n" |
2075 | "If the number is\n" | |
b380b885 MD |
2076 | "unknown, the result is #f. Otherwise, the result is a 0-origin integer\n" |
2077 | "- i.e. the first character of the first line is line 0, column 0.\n" | |
2078 | "(However, when you display a file position, for example in an error\n" | |
650a1cf9 | 2079 | "message, we recommend you add 1 to get 1-origin integers. This is\n" |
b380b885 MD |
2080 | "because lines and column numbers traditionally start with 1, and that is\n" |
2081 | "what non-programmers will find most natural.)") | |
1bbd0b84 | 2082 | #define FUNC_NAME s_scm_port_column |
0f2d19dd | 2083 | { |
78446828 | 2084 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 2085 | SCM_VALIDATE_OPENPORT (1, port); |
e11e83f3 | 2086 | return scm_from_int (SCM_COL (port)); |
0f2d19dd | 2087 | } |
1bbd0b84 | 2088 | #undef FUNC_NAME |
0f2d19dd | 2089 | |
a1ec6916 | 2090 | SCM_DEFINE (scm_set_port_column_x, "set-port-column!", 2, 0, 0, |
1bbd0b84 | 2091 | (SCM port, SCM column), |
a150979d KR |
2092 | "Set the current column of @var{port}. Before reading the first\n" |
2093 | "character on a line the column should be 0.") | |
1bbd0b84 | 2094 | #define FUNC_NAME s_scm_set_port_column_x |
d043d8c2 | 2095 | { |
360fc44c | 2096 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 2097 | SCM_VALIDATE_OPENPORT (1, port); |
a55c2b68 | 2098 | SCM_PTAB_ENTRY (port)->column_number = scm_to_int (column); |
564478fd | 2099 | return SCM_UNSPECIFIED; |
d043d8c2 | 2100 | } |
1bbd0b84 | 2101 | #undef FUNC_NAME |
d043d8c2 | 2102 | |
a1ec6916 | 2103 | SCM_DEFINE (scm_port_filename, "port-filename", 1, 0, 0, |
1bbd0b84 | 2104 | (SCM port), |
ac012a27 AW |
2105 | "Return the filename associated with @var{port}, or @code{#f}\n" |
2106 | "if no filename is associated with the port.") | |
1bbd0b84 | 2107 | #define FUNC_NAME s_scm_port_filename |
0f2d19dd | 2108 | { |
78446828 | 2109 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 2110 | SCM_VALIDATE_OPENPORT (1, port); |
b24b5e13 | 2111 | return SCM_FILENAME (port); |
0f2d19dd | 2112 | } |
1bbd0b84 | 2113 | #undef FUNC_NAME |
0f2d19dd | 2114 | |
a1ec6916 | 2115 | SCM_DEFINE (scm_set_port_filename_x, "set-port-filename!", 2, 0, 0, |
1bbd0b84 | 2116 | (SCM port, SCM filename), |
b380b885 MD |
2117 | "Change the filename associated with @var{port}, using the current input\n" |
2118 | "port if none is specified. Note that this does not change the port's\n" | |
2119 | "source of data, but only the value that is returned by\n" | |
2120 | "@code{port-filename} and reported in diagnostic output.") | |
1bbd0b84 | 2121 | #define FUNC_NAME s_scm_set_port_filename_x |
d14af9f2 | 2122 | { |
360fc44c | 2123 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 2124 | SCM_VALIDATE_OPENPORT (1, port); |
360fc44c | 2125 | /* We allow the user to set the filename to whatever he likes. */ |
b24b5e13 DH |
2126 | SCM_SET_FILENAME (port, filename); |
2127 | return SCM_UNSPECIFIED; | |
d14af9f2 | 2128 | } |
1bbd0b84 | 2129 | #undef FUNC_NAME |
d14af9f2 | 2130 | |
d6a6989e LC |
2131 | /* A fluid specifying the default encoding for newly created ports. If it is |
2132 | a string, that is the encoding. If it is #f, it is in the "native" | |
2133 | (Latin-1) encoding. */ | |
2134 | SCM_VARIABLE (default_port_encoding_var, "%default-port-encoding"); | |
2135 | ||
889975e5 MG |
2136 | static int scm_port_encoding_init = 0; |
2137 | ||
9d9c66ba LC |
2138 | /* Use ENCODING as the default encoding for future ports. */ |
2139 | void | |
2140 | scm_i_set_default_port_encoding (const char *encoding) | |
2141 | { | |
2142 | if (!scm_port_encoding_init | |
2143 | || !scm_is_fluid (SCM_VARIABLE_REF (default_port_encoding_var))) | |
2144 | scm_misc_error (NULL, "tried to set port encoding fluid before it is initialized", | |
2145 | SCM_EOL); | |
2146 | ||
2147 | if (encoding == NULL | |
2148 | || !strcmp (encoding, "ASCII") | |
2149 | || !strcmp (encoding, "ANSI_X3.4-1968") | |
2150 | || !strcmp (encoding, "ISO-8859-1")) | |
2151 | scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var), SCM_BOOL_F); | |
2152 | else | |
2153 | scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var), | |
2154 | scm_from_locale_string (encoding)); | |
2155 | } | |
2156 | ||
2157 | /* Return the name of the default encoding for newly created ports; a | |
2158 | return value of NULL means "ISO-8859-1". */ | |
889975e5 | 2159 | const char * |
9d9c66ba | 2160 | scm_i_default_port_encoding (void) |
889975e5 | 2161 | { |
9d9c66ba LC |
2162 | if (!scm_port_encoding_init) |
2163 | return NULL; | |
2164 | else if (!scm_is_fluid (SCM_VARIABLE_REF (default_port_encoding_var))) | |
2165 | return NULL; | |
2166 | else | |
889975e5 | 2167 | { |
9d9c66ba LC |
2168 | SCM encoding; |
2169 | ||
2170 | encoding = scm_fluid_ref (SCM_VARIABLE_REF (default_port_encoding_var)); | |
2171 | if (!scm_is_string (encoding)) | |
889975e5 MG |
2172 | return NULL; |
2173 | else | |
9d9c66ba | 2174 | return scm_i_string_chars (encoding); |
889975e5 MG |
2175 | } |
2176 | } | |
2177 | ||
889975e5 | 2178 | void |
064c27c4 | 2179 | scm_i_set_port_encoding_x (SCM port, const char *encoding) |
889975e5 | 2180 | { |
889975e5 | 2181 | scm_t_port *pt; |
9d9c66ba | 2182 | iconv_t new_input_cd, new_output_cd; |
889975e5 | 2183 | |
9d9c66ba LC |
2184 | new_input_cd = (iconv_t) -1; |
2185 | new_output_cd = (iconv_t) -1; | |
f4bc4e59 | 2186 | |
9d9c66ba LC |
2187 | /* Set the character encoding for this port. */ |
2188 | pt = SCM_PTAB_ENTRY (port); | |
f4bc4e59 | 2189 | |
9d9c66ba LC |
2190 | if (encoding == NULL) |
2191 | encoding = "ISO-8859-1"; | |
f4bc4e59 | 2192 | |
7b292a9d LC |
2193 | if (pt->encoding != encoding) |
2194 | pt->encoding = scm_gc_strdup (encoding, "port"); | |
d9544bf0 | 2195 | |
7b292a9d LC |
2196 | /* If ENCODING is UTF-8, then no conversion descriptor is opened |
2197 | because we do I/O ourselves. This saves 100+ KiB for each | |
2198 | descriptor. */ | |
2199 | if (strcmp (encoding, "UTF-8")) | |
9d9c66ba | 2200 | { |
7b292a9d LC |
2201 | if (SCM_CELL_WORD_0 (port) & SCM_RDNG) |
2202 | { | |
2203 | /* Open an input iconv conversion descriptor, from ENCODING | |
2204 | to UTF-8. We choose UTF-8, not UTF-32, because iconv | |
2205 | implementations can typically convert from anything to | |
2206 | UTF-8, but not to UTF-32 (see | |
2207 | <http://lists.gnu.org/archive/html/bug-libunistring/2010-09/msg00007.html>). */ | |
2208 | new_input_cd = iconv_open ("UTF-8", encoding); | |
2209 | if (new_input_cd == (iconv_t) -1) | |
2210 | goto invalid_encoding; | |
2211 | } | |
f4bc4e59 | 2212 | |
7b292a9d | 2213 | if (SCM_CELL_WORD_0 (port) & SCM_WRTNG) |
f4bc4e59 | 2214 | { |
7b292a9d LC |
2215 | new_output_cd = iconv_open (encoding, "UTF-8"); |
2216 | if (new_output_cd == (iconv_t) -1) | |
2217 | { | |
2218 | if (new_input_cd != (iconv_t) -1) | |
2219 | iconv_close (new_input_cd); | |
2220 | goto invalid_encoding; | |
2221 | } | |
f4bc4e59 | 2222 | } |
9d9c66ba | 2223 | } |
f4bc4e59 | 2224 | |
9d9c66ba LC |
2225 | if (pt->input_cd != (iconv_t) -1) |
2226 | iconv_close (pt->input_cd); | |
2227 | if (pt->output_cd != (iconv_t) -1) | |
2228 | iconv_close (pt->output_cd); | |
f4bc4e59 | 2229 | |
9d9c66ba LC |
2230 | pt->input_cd = new_input_cd; |
2231 | pt->output_cd = new_output_cd; | |
f4bc4e59 LC |
2232 | |
2233 | return; | |
2234 | ||
2235 | invalid_encoding: | |
2236 | { | |
2237 | SCM err; | |
064c27c4 LC |
2238 | err = scm_from_locale_string (encoding); |
2239 | scm_misc_error ("scm_i_set_port_encoding_x", | |
2240 | "invalid or unknown character encoding ~s", | |
f4bc4e59 LC |
2241 | scm_list_1 (err)); |
2242 | } | |
889975e5 MG |
2243 | } |
2244 | ||
2245 | SCM_DEFINE (scm_port_encoding, "port-encoding", 1, 0, 0, | |
2246 | (SCM port), | |
2247 | "Returns, as a string, the character encoding that @var{port}\n" | |
2248 | "uses to interpret its input and output.\n") | |
2249 | #define FUNC_NAME s_scm_port_encoding | |
2250 | { | |
2251 | scm_t_port *pt; | |
2252 | const char *enc; | |
2253 | ||
2254 | SCM_VALIDATE_PORT (1, port); | |
2255 | ||
2256 | pt = SCM_PTAB_ENTRY (port); | |
9d9c66ba | 2257 | enc = pt->encoding; |
889975e5 MG |
2258 | if (enc) |
2259 | return scm_from_locale_string (pt->encoding); | |
2260 | else | |
0af34a3f | 2261 | return SCM_BOOL_F; |
889975e5 MG |
2262 | } |
2263 | #undef FUNC_NAME | |
d6a6989e | 2264 | |
889975e5 MG |
2265 | SCM_DEFINE (scm_set_port_encoding_x, "set-port-encoding!", 2, 0, 0, |
2266 | (SCM port, SCM enc), | |
2267 | "Sets the character encoding that will be used to interpret all\n" | |
2268 | "port I/O. New ports are created with the encoding\n" | |
2269 | "appropriate for the current locale if @code{setlocale} has \n" | |
2270 | "been called or ISO-8859-1 otherwise\n" | |
2271 | "and this procedure can be used to modify that encoding.\n") | |
889975e5 MG |
2272 | #define FUNC_NAME s_scm_set_port_encoding_x |
2273 | { | |
2274 | char *enc_str; | |
889975e5 MG |
2275 | |
2276 | SCM_VALIDATE_PORT (1, port); | |
2277 | SCM_VALIDATE_STRING (2, enc); | |
2278 | ||
2279 | enc_str = scm_to_locale_string (enc); | |
da288f50 | 2280 | scm_i_set_port_encoding_x (port, enc_str); |
3e05fc04 | 2281 | free (enc_str); |
da288f50 | 2282 | |
889975e5 MG |
2283 | return SCM_UNSPECIFIED; |
2284 | } | |
2285 | #undef FUNC_NAME | |
2286 | ||
2287 | ||
2288 | /* This determines how conversions handle unconvertible characters. */ | |
2289 | SCM_GLOBAL_VARIABLE (scm_conversion_strategy, "%port-conversion-strategy"); | |
2290 | static int scm_conversion_strategy_init = 0; | |
2291 | ||
2292 | scm_t_string_failed_conversion_handler | |
2293 | scm_i_get_conversion_strategy (SCM port) | |
2294 | { | |
2295 | SCM encoding; | |
2296 | ||
2297 | if (scm_is_false (port)) | |
2298 | { | |
2299 | if (!scm_conversion_strategy_init | |
2300 | || !scm_is_fluid (SCM_VARIABLE_REF (scm_conversion_strategy))) | |
2301 | return SCM_FAILED_CONVERSION_QUESTION_MARK; | |
2302 | else | |
2303 | { | |
2304 | encoding = scm_fluid_ref (SCM_VARIABLE_REF (scm_conversion_strategy)); | |
2305 | if (scm_is_false (encoding)) | |
2306 | return SCM_FAILED_CONVERSION_QUESTION_MARK; | |
2307 | else | |
2308 | return (scm_t_string_failed_conversion_handler) scm_to_int (encoding); | |
2309 | } | |
2310 | } | |
2311 | else | |
2312 | { | |
2313 | scm_t_port *pt; | |
2314 | pt = SCM_PTAB_ENTRY (port); | |
e1ee45e7 | 2315 | return pt->ilseq_handler; |
889975e5 MG |
2316 | } |
2317 | ||
2318 | } | |
2319 | ||
2320 | void | |
2321 | scm_i_set_conversion_strategy_x (SCM port, | |
2322 | scm_t_string_failed_conversion_handler handler) | |
2323 | { | |
2324 | SCM strategy; | |
2325 | scm_t_port *pt; | |
2326 | ||
2327 | strategy = scm_from_int ((int) handler); | |
2328 | ||
2329 | if (scm_is_false (port)) | |
2330 | { | |
2331 | /* Set the default encoding for future ports. */ | |
2e16a342 | 2332 | if (!scm_conversion_strategy_init |
889975e5 MG |
2333 | || !scm_is_fluid (SCM_VARIABLE_REF (scm_conversion_strategy))) |
2334 | scm_misc_error (NULL, "tried to set conversion strategy fluid before it is initialized", | |
2335 | SCM_EOL); | |
2336 | scm_fluid_set_x (SCM_VARIABLE_REF (scm_conversion_strategy), strategy); | |
2337 | } | |
2338 | else | |
2339 | { | |
2340 | /* Set the character encoding for this port. */ | |
2341 | pt = SCM_PTAB_ENTRY (port); | |
2342 | pt->ilseq_handler = handler; | |
2343 | } | |
2344 | } | |
2345 | ||
2346 | SCM_DEFINE (scm_port_conversion_strategy, "port-conversion-strategy", | |
2347 | 1, 0, 0, (SCM port), | |
2348 | "Returns the behavior of the port when handling a character that\n" | |
2349 | "is not representable in the port's current encoding.\n" | |
2350 | "It returns the symbol @code{error} if unrepresentable characters\n" | |
2351 | "should cause exceptions, @code{substitute} if the port should\n" | |
2352 | "try to replace unrepresentable characters with question marks or\n" | |
2353 | "approximate characters, or @code{escape} if unrepresentable\n" | |
2354 | "characters should be converted to string escapes.\n" | |
2355 | "\n" | |
2356 | "If @var{port} is @code{#f}, then the current default behavior\n" | |
2357 | "will be returned. New ports will have this default behavior\n" | |
2358 | "when they are created.\n") | |
2359 | #define FUNC_NAME s_scm_port_conversion_strategy | |
2360 | { | |
2361 | scm_t_string_failed_conversion_handler h; | |
2362 | ||
2363 | SCM_VALIDATE_OPPORT (1, port); | |
2364 | ||
2365 | if (!scm_is_false (port)) | |
2366 | { | |
2367 | SCM_VALIDATE_OPPORT (1, port); | |
2368 | } | |
2369 | ||
2370 | h = scm_i_get_conversion_strategy (port); | |
2371 | if (h == SCM_FAILED_CONVERSION_ERROR) | |
4a655e50 | 2372 | return scm_from_latin1_symbol ("error"); |
889975e5 | 2373 | else if (h == SCM_FAILED_CONVERSION_QUESTION_MARK) |
4a655e50 | 2374 | return scm_from_latin1_symbol ("substitute"); |
889975e5 | 2375 | else if (h == SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE) |
4a655e50 | 2376 | return scm_from_latin1_symbol ("escape"); |
889975e5 MG |
2377 | else |
2378 | abort (); | |
2379 | ||
2380 | /* Never gets here. */ | |
2381 | return SCM_UNDEFINED; | |
2382 | } | |
2383 | #undef FUNC_NAME | |
2384 | ||
2385 | SCM_DEFINE (scm_set_port_conversion_strategy_x, "set-port-conversion-strategy!", | |
2386 | 2, 0, 0, | |
2387 | (SCM port, SCM sym), | |
2388 | "Sets the behavior of the interpreter when outputting a character\n" | |
2389 | "that is not representable in the port's current encoding.\n" | |
2390 | "@var{sym} can be either @code{'error}, @code{'substitute}, or\n" | |
2391 | "@code{'escape}. If it is @code{'error}, an error will be thrown\n" | |
2392 | "when an unconvertible character is encountered. If it is\n" | |
2393 | "@code{'substitute}, then unconvertible characters will \n" | |
2394 | "be replaced with approximate characters, or with question marks\n" | |
2395 | "if no approximately correct character is available.\n" | |
2396 | "If it is @code{'escape},\n" | |
2397 | "it will appear as a hex escape when output.\n" | |
2398 | "\n" | |
2399 | "If @var{port} is an open port, the conversion error behavior\n" | |
2400 | "is set for that port. If it is @code{#f}, it is set as the\n" | |
2401 | "default behavior for any future ports that get created in\n" | |
2402 | "this thread.\n") | |
2403 | #define FUNC_NAME s_scm_set_port_conversion_strategy_x | |
2404 | { | |
2405 | SCM err; | |
2406 | SCM qm; | |
2407 | SCM esc; | |
2408 | ||
2409 | if (!scm_is_false (port)) | |
2410 | { | |
2411 | SCM_VALIDATE_OPPORT (1, port); | |
2412 | } | |
2413 | ||
4a655e50 | 2414 | err = scm_from_latin1_symbol ("error"); |
889975e5 MG |
2415 | if (scm_is_true (scm_eqv_p (sym, err))) |
2416 | { | |
2417 | scm_i_set_conversion_strategy_x (port, SCM_FAILED_CONVERSION_ERROR); | |
2418 | return SCM_UNSPECIFIED; | |
2419 | } | |
2420 | ||
4a655e50 | 2421 | qm = scm_from_latin1_symbol ("substitute"); |
889975e5 MG |
2422 | if (scm_is_true (scm_eqv_p (sym, qm))) |
2423 | { | |
2424 | scm_i_set_conversion_strategy_x (port, | |
2425 | SCM_FAILED_CONVERSION_QUESTION_MARK); | |
2426 | return SCM_UNSPECIFIED; | |
2427 | } | |
2428 | ||
4a655e50 | 2429 | esc = scm_from_latin1_symbol ("escape"); |
889975e5 MG |
2430 | if (scm_is_true (scm_eqv_p (sym, esc))) |
2431 | { | |
2432 | scm_i_set_conversion_strategy_x (port, | |
2433 | SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE); | |
2434 | return SCM_UNSPECIFIED; | |
2435 | } | |
2436 | ||
2437 | SCM_MISC_ERROR ("unknown conversion behavior ~s", scm_list_1 (sym)); | |
2438 | ||
2439 | return SCM_UNSPECIFIED; | |
2440 | } | |
2441 | #undef FUNC_NAME | |
2442 | ||
2443 | ||
2444 | ||
f12733c9 MD |
2445 | void |
2446 | scm_print_port_mode (SCM exp, SCM port) | |
2447 | { | |
2448 | scm_puts (SCM_CLOSEDP (exp) | |
2449 | ? "closed: " | |
f9a64404 DH |
2450 | : (SCM_RDNG & SCM_CELL_WORD_0 (exp) |
2451 | ? (SCM_WRTNG & SCM_CELL_WORD_0 (exp) | |
f12733c9 MD |
2452 | ? "input-output: " |
2453 | : "input: ") | |
f9a64404 | 2454 | : (SCM_WRTNG & SCM_CELL_WORD_0 (exp) |
f12733c9 MD |
2455 | ? "output: " |
2456 | : "bogus: ")), | |
2457 | port); | |
2458 | } | |
1cc91f1b | 2459 | |
f12733c9 | 2460 | int |
e81d98ec | 2461 | scm_port_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) |
0f2d19dd | 2462 | { |
f12733c9 MD |
2463 | char *type = SCM_PTOBNAME (SCM_PTOBNUM (exp)); |
2464 | if (!type) | |
2465 | type = "port"; | |
b7f3516f | 2466 | scm_puts ("#<", port); |
f12733c9 | 2467 | scm_print_port_mode (exp, port); |
b7f3516f TT |
2468 | scm_puts (type, port); |
2469 | scm_putc (' ', port); | |
0345e278 | 2470 | scm_uintprint (SCM_CELL_WORD_1 (exp), 16, port); |
b7f3516f | 2471 | scm_putc ('>', port); |
f12733c9 | 2472 | return 1; |
0f2d19dd JB |
2473 | } |
2474 | ||
0f2d19dd | 2475 | \f |
ee149d03 | 2476 | |
d68fee48 | 2477 | /* Void ports. */ |
0f2d19dd | 2478 | |
92c2555f | 2479 | scm_t_bits scm_tc16_void_port = 0; |
0f2d19dd | 2480 | |
e81d98ec | 2481 | static int fill_input_void_port (SCM port SCM_UNUSED) |
283a1a0e | 2482 | { |
70df8af6 | 2483 | return EOF; |
283a1a0e GH |
2484 | } |
2485 | ||
31703ab8 | 2486 | static void |
e81d98ec DH |
2487 | write_void_port (SCM port SCM_UNUSED, |
2488 | const void *data SCM_UNUSED, | |
2489 | size_t size SCM_UNUSED) | |
31703ab8 GH |
2490 | { |
2491 | } | |
2492 | ||
d617ee18 MV |
2493 | static SCM |
2494 | scm_i_void_port (long mode_bits) | |
0f2d19dd | 2495 | { |
2721f918 AW |
2496 | SCM ret; |
2497 | ||
2498 | ret = scm_c_make_port (scm_tc16_void_port, mode_bits, 0); | |
da220f27 | 2499 | |
2721f918 | 2500 | scm_port_non_buffer (SCM_PTAB_ENTRY (ret)); |
402788a9 | 2501 | |
2721f918 | 2502 | return ret; |
0f2d19dd JB |
2503 | } |
2504 | ||
d617ee18 MV |
2505 | SCM |
2506 | scm_void_port (char *mode_str) | |
2507 | { | |
2508 | return scm_i_void_port (scm_mode_bits (mode_str)); | |
2509 | } | |
2510 | ||
a1ec6916 | 2511 | SCM_DEFINE (scm_sys_make_void_port, "%make-void-port", 1, 0, 0, |
1bbd0b84 | 2512 | (SCM mode), |
70df8af6 | 2513 | "Create and return a new void port. A void port acts like\n" |
bb2c02f2 | 2514 | "@file{/dev/null}. The @var{mode} argument\n" |
70df8af6 | 2515 | "specifies the input/output modes for this port: see the\n" |
b380b885 | 2516 | "documentation for @code{open-file} in @ref{File Ports}.") |
1bbd0b84 | 2517 | #define FUNC_NAME s_scm_sys_make_void_port |
0f2d19dd | 2518 | { |
d617ee18 | 2519 | return scm_i_void_port (scm_i_mode_bits (mode)); |
0f2d19dd | 2520 | } |
1bbd0b84 | 2521 | #undef FUNC_NAME |
0f2d19dd | 2522 | |
0f2d19dd | 2523 | \f |
89545eba | 2524 | /* Initialization. */ |
1cc91f1b | 2525 | |
0f2d19dd JB |
2526 | void |
2527 | scm_init_ports () | |
0f2d19dd | 2528 | { |
840ae05d | 2529 | /* lseek() symbols. */ |
e11e83f3 MV |
2530 | scm_c_define ("SEEK_SET", scm_from_int (SEEK_SET)); |
2531 | scm_c_define ("SEEK_CUR", scm_from_int (SEEK_CUR)); | |
2532 | scm_c_define ("SEEK_END", scm_from_int (SEEK_END)); | |
840ae05d | 2533 | |
70df8af6 GH |
2534 | scm_tc16_void_port = scm_make_port_type ("void", fill_input_void_port, |
2535 | write_void_port); | |
9de87eea | 2536 | |
f39448c5 AW |
2537 | cur_inport_fluid = scm_make_fluid (); |
2538 | cur_outport_fluid = scm_make_fluid (); | |
2539 | cur_errport_fluid = scm_make_fluid (); | |
2540 | cur_loadport_fluid = scm_make_fluid (); | |
9de87eea | 2541 | |
2721f918 | 2542 | scm_i_port_weak_set = scm_c_make_weak_set (31); |
d6a6989e | 2543 | |
a0599745 | 2544 | #include "libguile/ports.x" |
889975e5 | 2545 | |
d6a6989e LC |
2546 | /* Use Latin-1 as the default port encoding. */ |
2547 | SCM_VARIABLE_SET (default_port_encoding_var, scm_make_fluid ()); | |
2548 | scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var), SCM_BOOL_F); | |
889975e5 | 2549 | scm_port_encoding_init = 1; |
d6a6989e | 2550 | |
889975e5 MG |
2551 | SCM_VARIABLE_SET (scm_conversion_strategy, scm_make_fluid ()); |
2552 | scm_fluid_set_x (SCM_VARIABLE_REF (scm_conversion_strategy), | |
2553 | scm_from_int ((int) SCM_FAILED_CONVERSION_QUESTION_MARK)); | |
2554 | scm_conversion_strategy_init = 1; | |
2555 | ||
0f2d19dd | 2556 | } |
89e00824 ML |
2557 | |
2558 | /* | |
2559 | Local Variables: | |
2560 | c-file-style: "gnu" | |
2561 | End: | |
2562 | */ |