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 | */ | |
dd3a26f3 AW |
101 | scm_t_ptob_descriptor *scm_ptobs = NULL; |
102 | long scm_numptob = 0; | |
0f2d19dd | 103 | |
ee149d03 | 104 | /* GC marker for a port with stream of SCM type. */ |
0f2d19dd | 105 | SCM |
a284e297 | 106 | scm_markstream (SCM ptr) |
0f2d19dd JB |
107 | { |
108 | int openp; | |
f9a64404 | 109 | openp = SCM_CELL_WORD_0 (ptr) & SCM_OPN; |
0f2d19dd | 110 | if (openp) |
74a16888 | 111 | return SCM_PACK (SCM_STREAM (ptr)); |
0f2d19dd JB |
112 | else |
113 | return SCM_BOOL_F; | |
114 | } | |
115 | ||
f12733c9 | 116 | /* |
f12733c9 | 117 | * We choose to use an interface similar to the smob interface with |
affc96b5 | 118 | * fill_input and write as standard fields, passed to the port |
f12733c9 MD |
119 | * type constructor, and optional fields set by setters. |
120 | */ | |
121 | ||
70df8af6 | 122 | static void |
e81d98ec | 123 | flush_port_default (SCM port SCM_UNUSED) |
70df8af6 GH |
124 | { |
125 | } | |
126 | ||
127 | static void | |
e81d98ec | 128 | end_input_default (SCM port SCM_UNUSED, int offset SCM_UNUSED) |
70df8af6 GH |
129 | { |
130 | } | |
0f2d19dd | 131 | |
92c2555f | 132 | scm_t_bits |
f12733c9 | 133 | scm_make_port_type (char *name, |
affc96b5 | 134 | int (*fill_input) (SCM port), |
8aa011a1 | 135 | void (*write) (SCM port, const void *data, size_t size)) |
0f2d19dd JB |
136 | { |
137 | char *tmp; | |
0953b549 | 138 | if (SCM_I_MAX_PORT_TYPE_COUNT - 1 <= scm_numptob) |
0f2d19dd | 139 | goto ptoberr; |
9de87eea | 140 | SCM_CRITICAL_SECTION_START; |
fca43887 LC |
141 | tmp = (char *) scm_gc_realloc ((char *) scm_ptobs, |
142 | scm_numptob * sizeof (scm_t_ptob_descriptor), | |
143 | (1 + scm_numptob) | |
144 | * sizeof (scm_t_ptob_descriptor), | |
145 | "port-type"); | |
0f2d19dd JB |
146 | if (tmp) |
147 | { | |
92c2555f | 148 | scm_ptobs = (scm_t_ptob_descriptor *) tmp; |
affc96b5 | 149 | |
f12733c9 MD |
150 | scm_ptobs[scm_numptob].name = name; |
151 | scm_ptobs[scm_numptob].mark = 0; | |
3051344b | 152 | scm_ptobs[scm_numptob].free = NULL; |
f12733c9 MD |
153 | scm_ptobs[scm_numptob].print = scm_port_print; |
154 | scm_ptobs[scm_numptob].equalp = 0; | |
affc96b5 GH |
155 | scm_ptobs[scm_numptob].close = 0; |
156 | ||
157 | scm_ptobs[scm_numptob].write = write; | |
70df8af6 | 158 | scm_ptobs[scm_numptob].flush = flush_port_default; |
affc96b5 | 159 | |
70df8af6 | 160 | scm_ptobs[scm_numptob].end_input = end_input_default; |
affc96b5 GH |
161 | scm_ptobs[scm_numptob].fill_input = fill_input; |
162 | scm_ptobs[scm_numptob].input_waiting = 0; | |
163 | ||
f12733c9 | 164 | scm_ptobs[scm_numptob].seek = 0; |
affc96b5 GH |
165 | scm_ptobs[scm_numptob].truncate = 0; |
166 | ||
0f2d19dd JB |
167 | scm_numptob++; |
168 | } | |
9de87eea | 169 | SCM_CRITICAL_SECTION_END; |
0f2d19dd | 170 | if (!tmp) |
2500356c DH |
171 | { |
172 | ptoberr: | |
173 | scm_memory_error ("scm_make_port_type"); | |
174 | } | |
f12733c9 | 175 | /* Make a class object if Goops is present */ |
63385df2 | 176 | if (SCM_UNPACK (scm_port_class[0]) != 0) |
f12733c9 | 177 | scm_make_port_classes (scm_numptob - 1, SCM_PTOBNAME (scm_numptob - 1)); |
0f2d19dd JB |
178 | return scm_tc7_port + (scm_numptob - 1) * 256; |
179 | } | |
180 | ||
f12733c9 | 181 | void |
23f2b9a3 | 182 | scm_set_port_mark (scm_t_bits tc, SCM (*mark) (SCM)) |
f12733c9 MD |
183 | { |
184 | scm_ptobs[SCM_TC2PTOBNUM (tc)].mark = mark; | |
185 | } | |
186 | ||
187 | void | |
23f2b9a3 | 188 | scm_set_port_free (scm_t_bits tc, size_t (*free) (SCM)) |
f12733c9 MD |
189 | { |
190 | scm_ptobs[SCM_TC2PTOBNUM (tc)].free = free; | |
191 | } | |
192 | ||
193 | void | |
23f2b9a3 | 194 | scm_set_port_print (scm_t_bits tc, int (*print) (SCM exp, SCM port, |
f12733c9 MD |
195 | scm_print_state *pstate)) |
196 | { | |
197 | scm_ptobs[SCM_TC2PTOBNUM (tc)].print = print; | |
198 | } | |
199 | ||
200 | void | |
23f2b9a3 | 201 | scm_set_port_equalp (scm_t_bits tc, SCM (*equalp) (SCM, SCM)) |
f12733c9 MD |
202 | { |
203 | scm_ptobs[SCM_TC2PTOBNUM (tc)].equalp = equalp; | |
204 | } | |
205 | ||
31703ab8 | 206 | void |
23f2b9a3 | 207 | scm_set_port_flush (scm_t_bits tc, void (*flush) (SCM port)) |
31703ab8 | 208 | { |
affc96b5 | 209 | scm_ptobs[SCM_TC2PTOBNUM (tc)].flush = flush; |
31703ab8 GH |
210 | } |
211 | ||
f12733c9 | 212 | void |
23f2b9a3 | 213 | scm_set_port_end_input (scm_t_bits tc, void (*end_input) (SCM port, int offset)) |
f12733c9 | 214 | { |
affc96b5 | 215 | scm_ptobs[SCM_TC2PTOBNUM (tc)].end_input = end_input; |
f12733c9 MD |
216 | } |
217 | ||
218 | void | |
23f2b9a3 | 219 | scm_set_port_close (scm_t_bits tc, int (*close) (SCM)) |
f12733c9 | 220 | { |
affc96b5 | 221 | scm_ptobs[SCM_TC2PTOBNUM (tc)].close = close; |
f12733c9 MD |
222 | } |
223 | ||
224 | void | |
f1ce9199 LC |
225 | scm_set_port_seek (scm_t_bits tc, |
226 | scm_t_off (*seek) (SCM, scm_t_off, int)) | |
f12733c9 MD |
227 | { |
228 | scm_ptobs[SCM_TC2PTOBNUM (tc)].seek = seek; | |
229 | } | |
230 | ||
231 | void | |
f1ce9199 | 232 | scm_set_port_truncate (scm_t_bits tc, void (*truncate) (SCM, scm_t_off)) |
f12733c9 | 233 | { |
affc96b5 | 234 | scm_ptobs[SCM_TC2PTOBNUM (tc)].truncate = truncate; |
f12733c9 MD |
235 | } |
236 | ||
237 | void | |
23f2b9a3 | 238 | scm_set_port_input_waiting (scm_t_bits tc, int (*input_waiting) (SCM)) |
f12733c9 | 239 | { |
affc96b5 | 240 | scm_ptobs[SCM_TC2PTOBNUM (tc)].input_waiting = input_waiting; |
f12733c9 MD |
241 | } |
242 | ||
0f2d19dd | 243 | \f |
0f2d19dd | 244 | |
3b3b36dd | 245 | SCM_DEFINE (scm_char_ready_p, "char-ready?", 0, 1, 0, |
1e6808ea MG |
246 | (SCM port), |
247 | "Return @code{#t} if a character is ready on input @var{port}\n" | |
248 | "and return @code{#f} otherwise. If @code{char-ready?} returns\n" | |
249 | "@code{#t} then the next @code{read-char} operation on\n" | |
250 | "@var{port} is guaranteed not to hang. If @var{port} is a file\n" | |
251 | "port at end of file then @code{char-ready?} returns @code{#t}.\n" | |
c2dfff19 KR |
252 | "\n" |
253 | "@code{char-ready?} exists to make it possible for a\n" | |
1e6808ea MG |
254 | "program to accept characters from interactive ports without\n" |
255 | "getting stuck waiting for input. Any input editors associated\n" | |
256 | "with such ports must make sure that characters whose existence\n" | |
257 | "has been asserted by @code{char-ready?} cannot be rubbed out.\n" | |
258 | "If @code{char-ready?} were to return @code{#f} at end of file,\n" | |
259 | "a port at end of file would be indistinguishable from an\n" | |
c2dfff19 | 260 | "interactive port that has no ready characters.") |
1bbd0b84 | 261 | #define FUNC_NAME s_scm_char_ready_p |
0f2d19dd | 262 | { |
92c2555f | 263 | scm_t_port *pt; |
6c951427 | 264 | |
0f2d19dd | 265 | if (SCM_UNBNDP (port)) |
9de87eea | 266 | port = scm_current_input_port (); |
b2456dd4 AW |
267 | /* It's possible to close the current input port, so validate even in |
268 | this case. */ | |
269 | SCM_VALIDATE_OPINPORT (1, port); | |
d68fee48 | 270 | |
ae4c4016 JB |
271 | pt = SCM_PTAB_ENTRY (port); |
272 | ||
6c951427 GH |
273 | /* if the current read buffer is filled, or the |
274 | last pushed-back char has been read and the saved buffer is | |
275 | filled, result is true. */ | |
276 | if (pt->read_pos < pt->read_end | |
277 | || (pt->read_buf == pt->putback_buf | |
278 | && pt->saved_read_pos < pt->saved_read_end)) | |
0f2d19dd | 279 | return SCM_BOOL_T; |
ee149d03 JB |
280 | else |
281 | { | |
92c2555f | 282 | scm_t_ptob_descriptor *ptob = &scm_ptobs[SCM_PTOBNUM (port)]; |
ee149d03 | 283 | |
affc96b5 | 284 | if (ptob->input_waiting) |
7888309b | 285 | return scm_from_bool(ptob->input_waiting (port)); |
ee149d03 | 286 | else |
6c951427 | 287 | return SCM_BOOL_T; |
ee149d03 | 288 | } |
0f2d19dd | 289 | } |
1bbd0b84 | 290 | #undef FUNC_NAME |
0f2d19dd | 291 | |
c2da2648 GH |
292 | /* move up to read_len chars from port's putback and/or read buffers |
293 | into memory starting at dest. returns the number of chars moved. */ | |
294 | size_t scm_take_from_input_buffers (SCM port, char *dest, size_t read_len) | |
295 | { | |
92c2555f | 296 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
c2da2648 GH |
297 | size_t chars_read = 0; |
298 | size_t from_buf = min (pt->read_end - pt->read_pos, read_len); | |
299 | ||
300 | if (from_buf > 0) | |
301 | { | |
302 | memcpy (dest, pt->read_pos, from_buf); | |
303 | pt->read_pos += from_buf; | |
304 | chars_read += from_buf; | |
305 | read_len -= from_buf; | |
306 | dest += from_buf; | |
307 | } | |
308 | ||
309 | /* if putback was active, try the real input buffer too. */ | |
310 | if (pt->read_buf == pt->putback_buf) | |
311 | { | |
312 | from_buf = min (pt->saved_read_end - pt->saved_read_pos, read_len); | |
313 | if (from_buf > 0) | |
314 | { | |
315 | memcpy (dest, pt->saved_read_pos, from_buf); | |
316 | pt->saved_read_pos += from_buf; | |
317 | chars_read += from_buf; | |
318 | } | |
319 | } | |
320 | return chars_read; | |
321 | } | |
322 | ||
6c951427 | 323 | /* Clear a port's read buffers, returning the contents. */ |
a1ec6916 | 324 | SCM_DEFINE (scm_drain_input, "drain-input", 1, 0, 0, |
1bbd0b84 | 325 | (SCM port), |
4a151b3d GH |
326 | "This procedure clears a port's input buffers, similar\n" |
327 | "to the way that force-output clears the output buffer. The\n" | |
328 | "contents of the buffers are returned as a single string, e.g.,\n" | |
329 | "\n" | |
330 | "@lisp\n" | |
331 | "(define p (open-input-file ...))\n" | |
332 | "(drain-input p) => empty string, nothing buffered yet.\n" | |
333 | "(unread-char (read-char p) p)\n" | |
334 | "(drain-input p) => initial chars from p, up to the buffer size.\n" | |
335 | "@end lisp\n\n" | |
336 | "Draining the buffers may be useful for cleanly finishing\n" | |
337 | "buffered I/O so that the file descriptor can be used directly\n" | |
338 | "for further input.") | |
1bbd0b84 | 339 | #define FUNC_NAME s_scm_drain_input |
ee149d03 | 340 | { |
840ae05d | 341 | SCM result; |
3a5fb14d | 342 | char *data; |
28a6e1b0 | 343 | scm_t_port *pt; |
c014a02e | 344 | long count; |
ee149d03 | 345 | |
34d19ef6 | 346 | SCM_VALIDATE_OPINPORT (1, port); |
28a6e1b0 | 347 | pt = SCM_PTAB_ENTRY (port); |
840ae05d | 348 | |
6c951427 GH |
349 | count = pt->read_end - pt->read_pos; |
350 | if (pt->read_buf == pt->putback_buf) | |
351 | count += pt->saved_read_end - pt->saved_read_pos; | |
840ae05d | 352 | |
67a72dc1 AW |
353 | if (count) |
354 | { | |
190d4b0d | 355 | result = scm_i_make_string (count, &data, 0); |
67a72dc1 AW |
356 | scm_take_from_input_buffers (port, data, count); |
357 | } | |
358 | else | |
359 | result = scm_nullstr; | |
360 | ||
840ae05d | 361 | return result; |
ee149d03 | 362 | } |
1bbd0b84 | 363 | #undef FUNC_NAME |
0f2d19dd JB |
364 | |
365 | \f | |
d68fee48 | 366 | /* Standard ports --- current input, output, error, and more(!). */ |
0f2d19dd | 367 | |
34297700 AW |
368 | static SCM cur_inport_fluid = SCM_BOOL_F; |
369 | static SCM cur_outport_fluid = SCM_BOOL_F; | |
370 | static SCM cur_errport_fluid = SCM_BOOL_F; | |
371 | static SCM cur_loadport_fluid = SCM_BOOL_F; | |
9de87eea | 372 | |
3b3b36dd | 373 | SCM_DEFINE (scm_current_input_port, "current-input-port", 0, 0, 0, |
e1546b65 MG |
374 | (), |
375 | "Return the current input port. This is the default port used\n" | |
376 | "by many input procedures. Initially, @code{current-input-port}\n" | |
377 | "returns the @dfn{standard input} in Unix and C terminology.") | |
1bbd0b84 | 378 | #define FUNC_NAME s_scm_current_input_port |
0f2d19dd | 379 | { |
34297700 | 380 | if (scm_is_true (cur_inport_fluid)) |
889975e5 MG |
381 | return scm_fluid_ref (cur_inport_fluid); |
382 | else | |
383 | return SCM_BOOL_F; | |
0f2d19dd | 384 | } |
1bbd0b84 | 385 | #undef FUNC_NAME |
0f2d19dd | 386 | |
3b3b36dd | 387 | SCM_DEFINE (scm_current_output_port, "current-output-port", 0, 0, 0, |
e1546b65 MG |
388 | (), |
389 | "Return the current output port. This is the default port used\n" | |
9401323e | 390 | "by many output procedures. Initially,\n" |
e1546b65 MG |
391 | "@code{current-output-port} returns the @dfn{standard output} in\n" |
392 | "Unix and C terminology.") | |
1bbd0b84 | 393 | #define FUNC_NAME s_scm_current_output_port |
0f2d19dd | 394 | { |
34297700 | 395 | if (scm_is_true (cur_outport_fluid)) |
889975e5 MG |
396 | return scm_fluid_ref (cur_outport_fluid); |
397 | else | |
398 | return SCM_BOOL_F; | |
0f2d19dd | 399 | } |
1bbd0b84 | 400 | #undef FUNC_NAME |
0f2d19dd | 401 | |
3b3b36dd | 402 | SCM_DEFINE (scm_current_error_port, "current-error-port", 0, 0, 0, |
1bbd0b84 | 403 | (), |
b380b885 MD |
404 | "Return the port to which errors and warnings should be sent (the\n" |
405 | "@dfn{standard error} in Unix and C terminology).") | |
1bbd0b84 | 406 | #define FUNC_NAME s_scm_current_error_port |
0f2d19dd | 407 | { |
34297700 | 408 | if (scm_is_true (cur_errport_fluid)) |
889975e5 MG |
409 | return scm_fluid_ref (cur_errport_fluid); |
410 | else | |
411 | return SCM_BOOL_F; | |
0f2d19dd | 412 | } |
1bbd0b84 | 413 | #undef FUNC_NAME |
0f2d19dd | 414 | |
3b3b36dd | 415 | SCM_DEFINE (scm_current_load_port, "current-load-port", 0, 0, 0, |
e1546b65 | 416 | (), |
b450f070 | 417 | "Return the current-load-port.\n" |
e1546b65 | 418 | "The load port is used internally by @code{primitive-load}.") |
1bbd0b84 | 419 | #define FUNC_NAME s_scm_current_load_port |
31614d8e | 420 | { |
9de87eea | 421 | return scm_fluid_ref (cur_loadport_fluid); |
31614d8e | 422 | } |
1bbd0b84 | 423 | #undef FUNC_NAME |
31614d8e | 424 | |
3b3b36dd | 425 | SCM_DEFINE (scm_set_current_input_port, "set-current-input-port", 1, 0, 0, |
1bbd0b84 | 426 | (SCM port), |
8f85c0c6 NJ |
427 | "@deffnx {Scheme Procedure} set-current-output-port port\n" |
428 | "@deffnx {Scheme Procedure} set-current-error-port port\n" | |
b380b885 MD |
429 | "Change the ports returned by @code{current-input-port},\n" |
430 | "@code{current-output-port} and @code{current-error-port}, respectively,\n" | |
431 | "so that they use the supplied @var{port} for input or output.") | |
1bbd0b84 | 432 | #define FUNC_NAME s_scm_set_current_input_port |
0f2d19dd | 433 | { |
9de87eea | 434 | SCM oinp = scm_fluid_ref (cur_inport_fluid); |
34d19ef6 | 435 | SCM_VALIDATE_OPINPORT (1, port); |
9de87eea | 436 | scm_fluid_set_x (cur_inport_fluid, port); |
0f2d19dd JB |
437 | return oinp; |
438 | } | |
1bbd0b84 | 439 | #undef FUNC_NAME |
0f2d19dd JB |
440 | |
441 | ||
3b3b36dd | 442 | SCM_DEFINE (scm_set_current_output_port, "set-current-output-port", 1, 0, 0, |
e1546b65 MG |
443 | (SCM port), |
444 | "Set the current default output port to @var{port}.") | |
1bbd0b84 | 445 | #define FUNC_NAME s_scm_set_current_output_port |
0f2d19dd | 446 | { |
9de87eea | 447 | SCM ooutp = scm_fluid_ref (cur_outport_fluid); |
78446828 | 448 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 449 | SCM_VALIDATE_OPOUTPORT (1, port); |
9de87eea | 450 | scm_fluid_set_x (cur_outport_fluid, port); |
0f2d19dd JB |
451 | return ooutp; |
452 | } | |
1bbd0b84 | 453 | #undef FUNC_NAME |
0f2d19dd JB |
454 | |
455 | ||
3b3b36dd | 456 | SCM_DEFINE (scm_set_current_error_port, "set-current-error-port", 1, 0, 0, |
e1546b65 MG |
457 | (SCM port), |
458 | "Set the current default error port to @var{port}.") | |
1bbd0b84 | 459 | #define FUNC_NAME s_scm_set_current_error_port |
0f2d19dd | 460 | { |
9de87eea | 461 | SCM oerrp = scm_fluid_ref (cur_errport_fluid); |
78446828 | 462 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 463 | SCM_VALIDATE_OPOUTPORT (1, port); |
9de87eea | 464 | scm_fluid_set_x (cur_errport_fluid, port); |
0f2d19dd JB |
465 | return oerrp; |
466 | } | |
1bbd0b84 | 467 | #undef FUNC_NAME |
0f2d19dd | 468 | |
185e369a | 469 | void |
661ae7ab | 470 | scm_dynwind_current_input_port (SCM port) |
9de87eea | 471 | #define FUNC_NAME NULL |
185e369a | 472 | { |
9de87eea | 473 | SCM_VALIDATE_OPINPORT (1, port); |
661ae7ab | 474 | scm_dynwind_fluid (cur_inport_fluid, port); |
185e369a | 475 | } |
9de87eea | 476 | #undef FUNC_NAME |
185e369a MV |
477 | |
478 | void | |
661ae7ab | 479 | scm_dynwind_current_output_port (SCM port) |
9de87eea | 480 | #define FUNC_NAME NULL |
185e369a | 481 | { |
9de87eea MV |
482 | port = SCM_COERCE_OUTPORT (port); |
483 | SCM_VALIDATE_OPOUTPORT (1, port); | |
661ae7ab | 484 | scm_dynwind_fluid (cur_outport_fluid, port); |
185e369a | 485 | } |
9de87eea | 486 | #undef FUNC_NAME |
185e369a MV |
487 | |
488 | void | |
661ae7ab | 489 | scm_dynwind_current_error_port (SCM port) |
9de87eea MV |
490 | #define FUNC_NAME NULL |
491 | { | |
492 | port = SCM_COERCE_OUTPORT (port); | |
493 | SCM_VALIDATE_OPOUTPORT (1, port); | |
661ae7ab | 494 | scm_dynwind_fluid (cur_errport_fluid, port); |
9de87eea MV |
495 | } |
496 | #undef FUNC_NAME | |
497 | ||
498 | void | |
661ae7ab | 499 | scm_i_dynwind_current_load_port (SCM port) |
185e369a | 500 | { |
661ae7ab | 501 | scm_dynwind_fluid (cur_loadport_fluid, port); |
185e369a MV |
502 | } |
503 | ||
0f2d19dd | 504 | \f |
840ae05d | 505 | /* The port table --- an array of pointers to ports. */ |
0f2d19dd | 506 | |
5dbc6c06 HWN |
507 | /* |
508 | We need a global registry of ports to flush them all at exit, and to | |
509 | get all the ports matching a file descriptor. | |
510 | */ | |
2721f918 | 511 | SCM scm_i_port_weak_set; |
b9ad392e | 512 | |
651a0735 LC |
513 | \f |
514 | /* Port finalization. */ | |
515 | ||
1cc91f1b | 516 | |
651a0735 LC |
517 | static void finalize_port (GC_PTR, GC_PTR); |
518 | ||
f4bc4e59 | 519 | /* Register a finalizer for PORT. */ |
651a0735 LC |
520 | static SCM_C_INLINE_KEYWORD void |
521 | register_finalizer_for_port (SCM port) | |
522 | { | |
f4bc4e59 LC |
523 | GC_finalization_proc prev_finalizer; |
524 | GC_PTR prev_finalization_data; | |
651a0735 | 525 | |
f4bc4e59 LC |
526 | /* Register a finalizer for PORT so that its iconv CDs get freed and |
527 | optionally its type's `free' function gets called. */ | |
528 | GC_REGISTER_FINALIZER_NO_ORDER (SCM2PTR (port), finalize_port, 0, | |
529 | &prev_finalizer, | |
530 | &prev_finalization_data); | |
651a0735 LC |
531 | } |
532 | ||
533 | /* Finalize the object (a port) pointed to by PTR. */ | |
534 | static void | |
535 | finalize_port (GC_PTR ptr, GC_PTR data) | |
536 | { | |
537 | long port_type; | |
538 | SCM port = PTR2SCM (ptr); | |
539 | ||
540 | if (!SCM_PORTP (port)) | |
541 | abort (); | |
542 | ||
543 | if (SCM_OPENP (port)) | |
544 | { | |
545 | if (SCM_REVEALED (port) > 0) | |
546 | /* Keep "revealed" ports alive and re-register a finalizer. */ | |
547 | register_finalizer_for_port (port); | |
548 | else | |
549 | { | |
f4bc4e59 LC |
550 | scm_t_port *entry; |
551 | ||
651a0735 LC |
552 | port_type = SCM_TC2PTOBNUM (SCM_CELL_TYPE (port)); |
553 | if (port_type >= scm_numptob) | |
554 | abort (); | |
555 | ||
556 | if (scm_ptobs[port_type].free) | |
557 | /* Yes, I really do mean `.free' rather than `.close'. `.close' | |
558 | is for explicit `close-port' by user. */ | |
559 | scm_ptobs[port_type].free (port); | |
560 | ||
f4bc4e59 LC |
561 | entry = SCM_PTAB_ENTRY (port); |
562 | ||
563 | if (entry->input_cd != (iconv_t) -1) | |
564 | iconv_close (entry->input_cd); | |
565 | if (entry->output_cd != (iconv_t) -1) | |
566 | iconv_close (entry->output_cd); | |
567 | ||
651a0735 LC |
568 | SCM_SETSTREAM (port, 0); |
569 | SCM_CLR_PORT_OPEN_FLAG (port); | |
651a0735 LC |
570 | |
571 | scm_gc_ports_collected++; | |
572 | } | |
573 | } | |
574 | } | |
575 | ||
576 | ||
577 | ||
578 | \f | |
579 | ||
da220f27 | 580 | SCM |
2721f918 AW |
581 | scm_c_make_port_with_encoding (scm_t_bits tag, unsigned long mode_bits, |
582 | const char *encoding, | |
583 | scm_t_string_failed_conversion_handler handler, | |
584 | scm_t_bits stream) | |
0f2d19dd | 585 | { |
2721f918 AW |
586 | SCM ret; |
587 | scm_t_port *entry; | |
588 | ||
589 | entry = (scm_t_port *) scm_gc_calloc (sizeof (scm_t_port), "port"); | |
590 | ret = scm_cell (tag | mode_bits, (scm_t_bits)entry); | |
5f16b897 | 591 | |
840ae05d | 592 | entry->file_name = SCM_BOOL_F; |
61e452ba | 593 | entry->rw_active = SCM_PORT_NEITHER; |
2721f918 AW |
594 | entry->port = ret; |
595 | entry->stream = stream; | |
596 | entry->encoding = encoding ? scm_gc_strdup (encoding, "port") : NULL; | |
f4bc4e59 LC |
597 | /* The conversion descriptors will be opened lazily. */ |
598 | entry->input_cd = (iconv_t) -1; | |
599 | entry->output_cd = (iconv_t) -1; | |
2721f918 | 600 | entry->ilseq_handler = handler; |
f4bc4e59 | 601 | |
2721f918 | 602 | scm_weak_set_add_x (scm_i_port_weak_set, ret); |
651a0735 LC |
603 | |
604 | /* For each new port, register a finalizer so that it port type's free | |
605 | function can be invoked eventually. */ | |
2721f918 | 606 | register_finalizer_for_port (ret); |
651a0735 | 607 | |
2721f918 AW |
608 | return ret; |
609 | } | |
610 | ||
611 | SCM | |
612 | scm_c_make_port (scm_t_bits tag, unsigned long mode_bits, scm_t_bits stream) | |
613 | { | |
614 | return scm_c_make_port_with_encoding (tag, mode_bits, | |
615 | scm_i_default_port_encoding (), | |
616 | scm_i_get_conversion_strategy (SCM_BOOL_F), | |
617 | stream); | |
618 | } | |
619 | ||
620 | SCM | |
621 | scm_new_port_table_entry (scm_t_bits tag) | |
622 | { | |
623 | return scm_c_make_port (tag, 0, 0); | |
0f2d19dd JB |
624 | } |
625 | ||
6c951427 | 626 | /* Remove a port from the table and destroy it. */ |
b9ad392e | 627 | |
8269ba5b | 628 | static void |
5dbc6c06 HWN |
629 | scm_i_remove_port (SCM port) |
630 | #define FUNC_NAME "scm_remove_port" | |
0f2d19dd | 631 | { |
8269ba5b | 632 | scm_t_port *p; |
682d78d0 | 633 | |
8269ba5b AW |
634 | p = SCM_PTAB_ENTRY (port); |
635 | scm_port_non_buffer (p); | |
2721f918 AW |
636 | SCM_SETPTAB_ENTRY (port, 0); |
637 | scm_weak_set_remove_x (scm_i_port_weak_set, port); | |
638 | ||
682d78d0 LC |
639 | p->putback_buf = NULL; |
640 | p->putback_buf_size = 0; | |
3e05fc04 AW |
641 | |
642 | if (p->input_cd != (iconv_t) -1) | |
643 | { | |
644 | iconv_close (p->input_cd); | |
645 | p->input_cd = (iconv_t) -1; | |
646 | } | |
647 | ||
648 | if (p->output_cd != (iconv_t) -1) | |
649 | { | |
650 | iconv_close (p->output_cd); | |
651 | p->output_cd = (iconv_t) -1; | |
652 | } | |
0f2d19dd | 653 | } |
db4b4ca6 DH |
654 | #undef FUNC_NAME |
655 | ||
0f2d19dd | 656 | |
70df8af6 | 657 | void |
92c2555f | 658 | scm_port_non_buffer (scm_t_port *pt) |
70df8af6 GH |
659 | { |
660 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; | |
661 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
662 | pt->read_buf_size = pt->write_buf_size = 1; | |
663 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
664 | } | |
0f2d19dd | 665 | |
d68fee48 JB |
666 | \f |
667 | /* Revealed counts --- an oddity inherited from SCSH. */ | |
668 | ||
8b13c6b3 GH |
669 | /* Find a port in the table and return its revealed count. |
670 | Also used by the garbage collector. | |
0f2d19dd | 671 | */ |
1cc91f1b | 672 | |
0f2d19dd | 673 | int |
a284e297 | 674 | scm_revealed_count (SCM port) |
0f2d19dd JB |
675 | { |
676 | return SCM_REVEALED(port); | |
677 | } | |
678 | ||
679 | ||
680 | ||
681 | /* Return the revealed count for a port. */ | |
682 | ||
3b3b36dd | 683 | SCM_DEFINE (scm_port_revealed, "port-revealed", 1, 0, 0, |
1bbd0b84 | 684 | (SCM port), |
1e6808ea | 685 | "Return the revealed count for @var{port}.") |
1bbd0b84 | 686 | #define FUNC_NAME s_scm_port_revealed |
0f2d19dd | 687 | { |
78446828 | 688 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 689 | SCM_VALIDATE_OPENPORT (1, port); |
e11e83f3 | 690 | return scm_from_int (scm_revealed_count (port)); |
0f2d19dd | 691 | } |
1bbd0b84 | 692 | #undef FUNC_NAME |
0f2d19dd JB |
693 | |
694 | /* Set the revealed count for a port. */ | |
3b3b36dd | 695 | SCM_DEFINE (scm_set_port_revealed_x, "set-port-revealed!", 2, 0, 0, |
1bbd0b84 | 696 | (SCM port, SCM rcount), |
b450f070 | 697 | "Sets the revealed count for a port to a given value.\n" |
b380b885 | 698 | "The return value is unspecified.") |
1bbd0b84 | 699 | #define FUNC_NAME s_scm_set_port_revealed_x |
0f2d19dd | 700 | { |
78446828 | 701 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 702 | SCM_VALIDATE_OPENPORT (1, port); |
a55c2b68 | 703 | SCM_REVEALED (port) = scm_to_int (rcount); |
8b13c6b3 | 704 | return SCM_UNSPECIFIED; |
0f2d19dd | 705 | } |
1bbd0b84 | 706 | #undef FUNC_NAME |
0f2d19dd | 707 | |
d68fee48 JB |
708 | |
709 | \f | |
710 | /* Retrieving a port's mode. */ | |
711 | ||
eadd48de GH |
712 | /* Return the flags that characterize a port based on the mode |
713 | * string used to open a file for that port. | |
714 | * | |
715 | * See PORT FLAGS in scm.h | |
716 | */ | |
717 | ||
3a5fb14d | 718 | static long |
889975e5 | 719 | scm_i_mode_bits_n (SCM modes) |
3a5fb14d MV |
720 | { |
721 | return (SCM_OPN | |
889975e5 MG |
722 | | (scm_i_string_contains_char (modes, 'r') |
723 | || scm_i_string_contains_char (modes, '+') ? SCM_RDNG : 0) | |
724 | | (scm_i_string_contains_char (modes, 'w') | |
725 | || scm_i_string_contains_char (modes, 'a') | |
726 | || scm_i_string_contains_char (modes, '+') ? SCM_WRTNG : 0) | |
727 | | (scm_i_string_contains_char (modes, '0') ? SCM_BUF0 : 0) | |
728 | | (scm_i_string_contains_char (modes, 'l') ? SCM_BUFLINE : 0)); | |
3a5fb14d MV |
729 | } |
730 | ||
eadd48de | 731 | long |
a284e297 | 732 | scm_mode_bits (char *modes) |
eadd48de | 733 | { |
889975e5 | 734 | return scm_i_mode_bits (scm_from_locale_string (modes)); |
eadd48de GH |
735 | } |
736 | ||
d617ee18 MV |
737 | long |
738 | scm_i_mode_bits (SCM modes) | |
739 | { | |
740 | long bits; | |
741 | ||
742 | if (!scm_is_string (modes)) | |
743 | scm_wrong_type_arg_msg (NULL, 0, modes, "string"); | |
744 | ||
889975e5 | 745 | bits = scm_i_mode_bits_n (modes); |
d617ee18 MV |
746 | scm_remember_upto_here_1 (modes); |
747 | return bits; | |
748 | } | |
eadd48de GH |
749 | |
750 | /* Return the mode flags from an open port. | |
751 | * Some modes such as "append" are only used when opening | |
752 | * a file and are not returned here. */ | |
753 | ||
3b3b36dd | 754 | SCM_DEFINE (scm_port_mode, "port-mode", 1, 0, 0, |
1bbd0b84 | 755 | (SCM port), |
1e6808ea MG |
756 | "Return the port modes associated with the open port @var{port}.\n" |
757 | "These will not necessarily be identical to the modes used when\n" | |
758 | "the port was opened, since modes such as \"append\" which are\n" | |
759 | "used only during port creation are not retained.") | |
1bbd0b84 | 760 | #define FUNC_NAME s_scm_port_mode |
eadd48de | 761 | { |
26a3038d | 762 | char modes[4]; |
eadd48de | 763 | modes[0] = '\0'; |
78446828 MV |
764 | |
765 | port = SCM_COERCE_OUTPORT (port); | |
34d19ef6 | 766 | SCM_VALIDATE_OPPORT (1, port); |
f9a64404 DH |
767 | if (SCM_CELL_WORD_0 (port) & SCM_RDNG) { |
768 | if (SCM_CELL_WORD_0 (port) & SCM_WRTNG) | |
eadd48de GH |
769 | strcpy (modes, "r+"); |
770 | else | |
771 | strcpy (modes, "r"); | |
772 | } | |
f9a64404 | 773 | else if (SCM_CELL_WORD_0 (port) & SCM_WRTNG) |
eadd48de | 774 | strcpy (modes, "w"); |
f9a64404 | 775 | if (SCM_CELL_WORD_0 (port) & SCM_BUF0) |
eadd48de | 776 | strcat (modes, "0"); |
3a5fb14d | 777 | return scm_from_locale_string (modes); |
eadd48de | 778 | } |
1bbd0b84 | 779 | #undef FUNC_NAME |
eadd48de GH |
780 | |
781 | ||
d68fee48 JB |
782 | \f |
783 | /* Closing ports. */ | |
784 | ||
0f2d19dd JB |
785 | /* scm_close_port |
786 | * Call the close operation on a port object. | |
eadd48de | 787 | * see also scm_close. |
0f2d19dd | 788 | */ |
3b3b36dd | 789 | SCM_DEFINE (scm_close_port, "close-port", 1, 0, 0, |
1bbd0b84 | 790 | (SCM port), |
1e6808ea MG |
791 | "Close the specified port object. Return @code{#t} if it\n" |
792 | "successfully closes a port or @code{#f} if it was already\n" | |
793 | "closed. An exception may be raised if an error occurs, for\n" | |
794 | "example when flushing buffered output. See also @ref{Ports and\n" | |
795 | "File Descriptors, close}, for a procedure which can close file\n" | |
796 | "descriptors.") | |
1bbd0b84 | 797 | #define FUNC_NAME s_scm_close_port |
0f2d19dd | 798 | { |
1be6b49c | 799 | size_t i; |
eadd48de GH |
800 | int rv; |
801 | ||
78446828 MV |
802 | port = SCM_COERCE_OUTPORT (port); |
803 | ||
7a754ca6 | 804 | SCM_VALIDATE_PORT (1, port); |
0f2d19dd | 805 | if (SCM_CLOSEDP (port)) |
eadd48de | 806 | return SCM_BOOL_F; |
0f2d19dd | 807 | i = SCM_PTOBNUM (port); |
affc96b5 GH |
808 | if (scm_ptobs[i].close) |
809 | rv = (scm_ptobs[i].close) (port); | |
eadd48de GH |
810 | else |
811 | rv = 0; | |
5dbc6c06 | 812 | scm_i_remove_port (port); |
22a52da1 | 813 | SCM_CLR_PORT_OPEN_FLAG (port); |
7888309b | 814 | return scm_from_bool (rv >= 0); |
7a754ca6 MD |
815 | } |
816 | #undef FUNC_NAME | |
817 | ||
818 | SCM_DEFINE (scm_close_input_port, "close-input-port", 1, 0, 0, | |
819 | (SCM port), | |
820 | "Close the specified input port object. The routine has no effect if\n" | |
821 | "the file has already been closed. An exception may be raised if an\n" | |
822 | "error occurs. The value returned is unspecified.\n\n" | |
823 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" | |
824 | "which can close file descriptors.") | |
825 | #define FUNC_NAME s_scm_close_input_port | |
826 | { | |
827 | SCM_VALIDATE_INPUT_PORT (1, port); | |
828 | scm_close_port (port); | |
829 | return SCM_UNSPECIFIED; | |
830 | } | |
831 | #undef FUNC_NAME | |
832 | ||
833 | SCM_DEFINE (scm_close_output_port, "close-output-port", 1, 0, 0, | |
834 | (SCM port), | |
835 | "Close the specified output port object. The routine has no effect if\n" | |
836 | "the file has already been closed. An exception may be raised if an\n" | |
837 | "error occurs. The value returned is unspecified.\n\n" | |
838 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" | |
839 | "which can close file descriptors.") | |
840 | #define FUNC_NAME s_scm_close_output_port | |
841 | { | |
842 | port = SCM_COERCE_OUTPORT (port); | |
843 | SCM_VALIDATE_OUTPUT_PORT (1, port); | |
844 | scm_close_port (port); | |
845 | return SCM_UNSPECIFIED; | |
0f2d19dd | 846 | } |
1bbd0b84 | 847 | #undef FUNC_NAME |
0f2d19dd | 848 | |
2721f918 AW |
849 | struct for_each_data |
850 | { | |
851 | void (*proc) (void *data, SCM p); | |
852 | void *data; | |
853 | }; | |
854 | ||
5dbc6c06 | 855 | static SCM |
2721f918 | 856 | for_each_trampoline (void *data, SCM port, SCM result) |
5dbc6c06 | 857 | { |
2721f918 AW |
858 | struct for_each_data *d = data; |
859 | ||
860 | d->proc (d->data, port); | |
861 | ||
862 | return result; | |
5dbc6c06 HWN |
863 | } |
864 | ||
c536b4b3 MV |
865 | void |
866 | scm_c_port_for_each (void (*proc)(void *data, SCM p), void *data) | |
c2ca4493 | 867 | { |
2721f918 AW |
868 | struct for_each_data d; |
869 | ||
870 | d.proc = proc; | |
871 | d.data = data; | |
fdfe6305 | 872 | |
2721f918 AW |
873 | scm_c_weak_set_fold (for_each_trampoline, &d, SCM_EOL, |
874 | scm_i_port_weak_set); | |
875 | } | |
3a5fb14d | 876 | |
2721f918 AW |
877 | static void |
878 | scm_for_each_trampoline (void *data, SCM port) | |
879 | { | |
880 | scm_call_1 (PTR2SCM (data), port); | |
c536b4b3 | 881 | } |
fdfe6305 | 882 | |
c536b4b3 MV |
883 | SCM_DEFINE (scm_port_for_each, "port-for-each", 1, 0, 0, |
884 | (SCM proc), | |
885 | "Apply @var{proc} to each port in the Guile port table\n" | |
886 | "in turn. The return value is unspecified. More specifically,\n" | |
887 | "@var{proc} is applied exactly once to every port that exists\n" | |
888 | "in the system at the time @var{port-for-each} is invoked.\n" | |
889 | "Changes to the port table while @var{port-for-each} is running\n" | |
890 | "have no effect as far as @var{port-for-each} is concerned.") | |
891 | #define FUNC_NAME s_scm_port_for_each | |
892 | { | |
893 | SCM_VALIDATE_PROC (1, proc); | |
894 | ||
2721f918 AW |
895 | scm_c_port_for_each (scm_for_each_trampoline, SCM2PTR (proc)); |
896 | ||
c2ca4493 GH |
897 | return SCM_UNSPECIFIED; |
898 | } | |
899 | #undef FUNC_NAME | |
900 | ||
c536b4b3 | 901 | |
d68fee48 JB |
902 | \f |
903 | /* Utter miscellany. Gosh, we should clean this up some time. */ | |
904 | ||
3b3b36dd | 905 | SCM_DEFINE (scm_input_port_p, "input-port?", 1, 0, 0, |
1bbd0b84 | 906 | (SCM x), |
1e6808ea MG |
907 | "Return @code{#t} if @var{x} is an input port, otherwise return\n" |
908 | "@code{#f}. Any object satisfying this predicate also satisfies\n" | |
909 | "@code{port?}.") | |
1bbd0b84 | 910 | #define FUNC_NAME s_scm_input_port_p |
0f2d19dd | 911 | { |
7888309b | 912 | return scm_from_bool (SCM_INPUT_PORT_P (x)); |
0f2d19dd | 913 | } |
1bbd0b84 | 914 | #undef FUNC_NAME |
0f2d19dd | 915 | |
3b3b36dd | 916 | SCM_DEFINE (scm_output_port_p, "output-port?", 1, 0, 0, |
1bbd0b84 | 917 | (SCM x), |
1e6808ea MG |
918 | "Return @code{#t} if @var{x} is an output port, otherwise return\n" |
919 | "@code{#f}. Any object satisfying this predicate also satisfies\n" | |
920 | "@code{port?}.") | |
1bbd0b84 | 921 | #define FUNC_NAME s_scm_output_port_p |
0f2d19dd | 922 | { |
82893676 | 923 | x = SCM_COERCE_OUTPORT (x); |
7888309b | 924 | return scm_from_bool (SCM_OUTPUT_PORT_P (x)); |
0f2d19dd | 925 | } |
1bbd0b84 | 926 | #undef FUNC_NAME |
0f2d19dd | 927 | |
eb5c0a2a GH |
928 | SCM_DEFINE (scm_port_p, "port?", 1, 0, 0, |
929 | (SCM x), | |
1e6808ea | 930 | "Return a boolean indicating whether @var{x} is a port.\n" |
5352393c MG |
931 | "Equivalent to @code{(or (input-port? @var{x}) (output-port?\n" |
932 | "@var{x}))}.") | |
eb5c0a2a GH |
933 | #define FUNC_NAME s_scm_port_p |
934 | { | |
7888309b | 935 | return scm_from_bool (SCM_PORTP (x)); |
eb5c0a2a GH |
936 | } |
937 | #undef FUNC_NAME | |
938 | ||
3b3b36dd | 939 | SCM_DEFINE (scm_port_closed_p, "port-closed?", 1, 0, 0, |
1bbd0b84 | 940 | (SCM port), |
1e6808ea MG |
941 | "Return @code{#t} if @var{port} is closed or @code{#f} if it is\n" |
942 | "open.") | |
1bbd0b84 | 943 | #define FUNC_NAME s_scm_port_closed_p |
60d0643d | 944 | { |
34d19ef6 | 945 | SCM_VALIDATE_PORT (1, port); |
7888309b | 946 | return scm_from_bool (!SCM_OPPORTP (port)); |
60d0643d | 947 | } |
1bbd0b84 | 948 | #undef FUNC_NAME |
0f2d19dd | 949 | |
3b3b36dd | 950 | SCM_DEFINE (scm_eof_object_p, "eof-object?", 1, 0, 0, |
1bbd0b84 | 951 | (SCM x), |
1e6808ea MG |
952 | "Return @code{#t} if @var{x} is an end-of-file object; otherwise\n" |
953 | "return @code{#f}.") | |
1bbd0b84 | 954 | #define FUNC_NAME s_scm_eof_object_p |
0f2d19dd | 955 | { |
7888309b | 956 | return scm_from_bool(SCM_EOF_OBJECT_P (x)); |
0f2d19dd | 957 | } |
1bbd0b84 | 958 | #undef FUNC_NAME |
0f2d19dd | 959 | |
3b3b36dd | 960 | SCM_DEFINE (scm_force_output, "force-output", 0, 1, 0, |
1bbd0b84 | 961 | (SCM port), |
b380b885 | 962 | "Flush the specified output port, or the current output port if @var{port}\n" |
9401323e | 963 | "is omitted. The current output buffer contents are passed to the\n" |
b380b885 MD |
964 | "underlying port implementation (e.g., in the case of fports, the\n" |
965 | "data will be written to the file and the output buffer will be cleared.)\n" | |
966 | "It has no effect on an unbuffered port.\n\n" | |
967 | "The return value is unspecified.") | |
1bbd0b84 | 968 | #define FUNC_NAME s_scm_force_output |
0f2d19dd JB |
969 | { |
970 | if (SCM_UNBNDP (port)) | |
9de87eea | 971 | port = scm_current_output_port (); |
0f2d19dd | 972 | else |
78446828 MV |
973 | { |
974 | port = SCM_COERCE_OUTPORT (port); | |
34d19ef6 | 975 | SCM_VALIDATE_OPOUTPORT (1, port); |
78446828 | 976 | } |
affc96b5 | 977 | scm_flush (port); |
ee149d03 | 978 | return SCM_UNSPECIFIED; |
0f2d19dd | 979 | } |
1bbd0b84 | 980 | #undef FUNC_NAME |
0f2d19dd | 981 | |
5dbc6c06 HWN |
982 | |
983 | static void | |
61d3568b | 984 | flush_output_port (void *closure, SCM port) |
5dbc6c06 | 985 | { |
5dbc6c06 HWN |
986 | if (SCM_OPOUTPORTP (port)) |
987 | scm_flush (port); | |
988 | } | |
989 | ||
a1ec6916 | 990 | SCM_DEFINE (scm_flush_all_ports, "flush-all-ports", 0, 0, 0, |
1bbd0b84 | 991 | (), |
b380b885 MD |
992 | "Equivalent to calling @code{force-output} on\n" |
993 | "all open output ports. The return value is unspecified.") | |
1bbd0b84 | 994 | #define FUNC_NAME s_scm_flush_all_ports |
89ea5b7c | 995 | { |
5dbc6c06 | 996 | scm_c_port_for_each (&flush_output_port, NULL); |
89ea5b7c GH |
997 | return SCM_UNSPECIFIED; |
998 | } | |
1bbd0b84 | 999 | #undef FUNC_NAME |
0f2d19dd | 1000 | |
3b3b36dd | 1001 | SCM_DEFINE (scm_read_char, "read-char", 0, 1, 0, |
1bbd0b84 | 1002 | (SCM port), |
1e6808ea MG |
1003 | "Return the next character available from @var{port}, updating\n" |
1004 | "@var{port} to point to the following character. If no more\n" | |
c62da8f8 LC |
1005 | "characters are available, the end-of-file object is returned.\n" |
1006 | "\n" | |
1007 | "When @var{port}'s data cannot be decoded according to its\n" | |
1008 | "character encoding, a @code{decoding-error} is raised and\n" | |
1009 | "@var{port} points past the erroneous byte sequence.\n") | |
1bbd0b84 | 1010 | #define FUNC_NAME s_scm_read_char |
0f2d19dd | 1011 | { |
889975e5 | 1012 | scm_t_wchar c; |
0f2d19dd | 1013 | if (SCM_UNBNDP (port)) |
9de87eea | 1014 | port = scm_current_input_port (); |
34d19ef6 | 1015 | SCM_VALIDATE_OPINPORT (1, port); |
b7f3516f | 1016 | c = scm_getc (port); |
0f2d19dd JB |
1017 | if (EOF == c) |
1018 | return SCM_EOF_VAL; | |
7866a09b | 1019 | return SCM_MAKE_CHAR (c); |
0f2d19dd | 1020 | } |
1bbd0b84 | 1021 | #undef FUNC_NAME |
0f2d19dd | 1022 | |
f4bc4e59 LC |
1023 | /* Update the line and column number of PORT after consumption of C. */ |
1024 | static inline void | |
1025 | update_port_lf (scm_t_wchar c, SCM port) | |
1026 | { | |
1027 | switch (c) | |
1028 | { | |
1029 | case '\a': | |
7b292a9d | 1030 | case EOF: |
f4bc4e59 LC |
1031 | break; |
1032 | case '\b': | |
1033 | SCM_DECCOL (port); | |
1034 | break; | |
1035 | case '\n': | |
1036 | SCM_INCLINE (port); | |
1037 | break; | |
1038 | case '\r': | |
1039 | SCM_ZEROCOL (port); | |
1040 | break; | |
1041 | case '\t': | |
1042 | SCM_TABCOL (port); | |
1043 | break; | |
1044 | default: | |
1045 | SCM_INCCOL (port); | |
1046 | break; | |
1047 | } | |
1048 | } | |
1049 | ||
889975e5 MG |
1050 | #define SCM_MBCHAR_BUF_SIZE (4) |
1051 | ||
f4bc4e59 LC |
1052 | /* Convert the SIZE-byte UTF-8 sequence in UTF8_BUF to a codepoint. |
1053 | UTF8_BUF is assumed to contain a valid UTF-8 sequence. */ | |
1054 | static scm_t_wchar | |
1055 | utf8_to_codepoint (const scm_t_uint8 *utf8_buf, size_t size) | |
1056 | { | |
1057 | scm_t_wchar codepoint; | |
1058 | ||
1059 | if (utf8_buf[0] <= 0x7f) | |
1060 | { | |
1061 | assert (size == 1); | |
1062 | codepoint = utf8_buf[0]; | |
1063 | } | |
1064 | else if ((utf8_buf[0] & 0xe0) == 0xc0) | |
1065 | { | |
1066 | assert (size == 2); | |
1067 | codepoint = ((scm_t_wchar) utf8_buf[0] & 0x1f) << 6UL | |
1068 | | (utf8_buf[1] & 0x3f); | |
1069 | } | |
1070 | else if ((utf8_buf[0] & 0xf0) == 0xe0) | |
1071 | { | |
1072 | assert (size == 3); | |
1073 | codepoint = ((scm_t_wchar) utf8_buf[0] & 0x0f) << 12UL | |
1074 | | ((scm_t_wchar) utf8_buf[1] & 0x3f) << 6UL | |
1075 | | (utf8_buf[2] & 0x3f); | |
1076 | } | |
1077 | else | |
1078 | { | |
1079 | assert (size == 4); | |
1080 | codepoint = ((scm_t_wchar) utf8_buf[0] & 0x07) << 18UL | |
1081 | | ((scm_t_wchar) utf8_buf[1] & 0x3f) << 12UL | |
1082 | | ((scm_t_wchar) utf8_buf[2] & 0x3f) << 6UL | |
1083 | | (utf8_buf[3] & 0x3f); | |
1084 | } | |
1085 | ||
1086 | return codepoint; | |
1087 | } | |
1088 | ||
7b292a9d LC |
1089 | /* Read a UTF-8 sequence from PORT. On success, return 0 and set |
1090 | *CODEPOINT to the codepoint that was read, fill BUF with its UTF-8 | |
1091 | representation, and set *LEN to the length in bytes. Return | |
1092 | `EILSEQ' on error. */ | |
c62da8f8 | 1093 | static int |
7b292a9d LC |
1094 | get_utf8_codepoint (SCM port, scm_t_wchar *codepoint, |
1095 | scm_t_uint8 buf[SCM_MBCHAR_BUF_SIZE], size_t *len) | |
889975e5 | 1096 | { |
7b292a9d LC |
1097 | #define ASSERT_NOT_EOF(b) \ |
1098 | if (SCM_UNLIKELY ((b) == EOF)) \ | |
1099 | goto invalid_seq | |
7be1705d LC |
1100 | #define CONSUME_PEEKED_BYTE() \ |
1101 | pt->read_pos++ | |
7b292a9d LC |
1102 | |
1103 | int byte; | |
7be1705d | 1104 | scm_t_port *pt; |
7b292a9d LC |
1105 | |
1106 | *len = 0; | |
7be1705d | 1107 | pt = SCM_PTAB_ENTRY (port); |
7b292a9d LC |
1108 | |
1109 | byte = scm_get_byte_or_eof (port); | |
1110 | if (byte == EOF) | |
1111 | { | |
1112 | *codepoint = EOF; | |
1113 | return 0; | |
1114 | } | |
1115 | ||
1116 | buf[0] = (scm_t_uint8) byte; | |
1117 | *len = 1; | |
1118 | ||
1119 | if (buf[0] <= 0x7f) | |
1120 | /* 1-byte form. */ | |
1121 | *codepoint = buf[0]; | |
1122 | else if (buf[0] >= 0xc2 && buf[0] <= 0xdf) | |
1123 | { | |
1124 | /* 2-byte form. */ | |
7be1705d | 1125 | byte = scm_peek_byte_or_eof (port); |
7b292a9d LC |
1126 | ASSERT_NOT_EOF (byte); |
1127 | ||
7b292a9d LC |
1128 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80)) |
1129 | goto invalid_seq; | |
1130 | ||
7be1705d LC |
1131 | CONSUME_PEEKED_BYTE (); |
1132 | buf[1] = (scm_t_uint8) byte; | |
1133 | *len = 2; | |
1134 | ||
7b292a9d LC |
1135 | *codepoint = ((scm_t_wchar) buf[0] & 0x1f) << 6UL |
1136 | | (buf[1] & 0x3f); | |
1137 | } | |
1138 | else if ((buf[0] & 0xf0) == 0xe0) | |
1139 | { | |
1140 | /* 3-byte form. */ | |
7be1705d LC |
1141 | byte = scm_peek_byte_or_eof (port); |
1142 | ASSERT_NOT_EOF (byte); | |
7b292a9d LC |
1143 | |
1144 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80 | |
1145 | || (buf[0] == 0xe0 && byte < 0xa0) | |
1146 | || (buf[0] == 0xed && byte > 0x9f))) | |
7be1705d | 1147 | goto invalid_seq; |
7b292a9d | 1148 | |
7be1705d LC |
1149 | CONSUME_PEEKED_BYTE (); |
1150 | buf[1] = (scm_t_uint8) byte; | |
1151 | *len = 2; | |
7b292a9d | 1152 | |
7be1705d | 1153 | byte = scm_peek_byte_or_eof (port); |
7b292a9d LC |
1154 | ASSERT_NOT_EOF (byte); |
1155 | ||
7b292a9d LC |
1156 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80)) |
1157 | goto invalid_seq; | |
1158 | ||
7be1705d LC |
1159 | CONSUME_PEEKED_BYTE (); |
1160 | buf[2] = (scm_t_uint8) byte; | |
1161 | *len = 3; | |
1162 | ||
7b292a9d LC |
1163 | *codepoint = ((scm_t_wchar) buf[0] & 0x0f) << 12UL |
1164 | | ((scm_t_wchar) buf[1] & 0x3f) << 6UL | |
1165 | | (buf[2] & 0x3f); | |
1166 | } | |
1167 | else if (buf[0] >= 0xf0 && buf[0] <= 0xf4) | |
1168 | { | |
1169 | /* 4-byte form. */ | |
7be1705d | 1170 | byte = scm_peek_byte_or_eof (port); |
7b292a9d LC |
1171 | ASSERT_NOT_EOF (byte); |
1172 | ||
7b292a9d LC |
1173 | if (SCM_UNLIKELY (((byte & 0xc0) != 0x80) |
1174 | || (buf[0] == 0xf0 && byte < 0x90) | |
1175 | || (buf[0] == 0xf4 && byte > 0x8f))) | |
7be1705d | 1176 | goto invalid_seq; |
7b292a9d | 1177 | |
7be1705d LC |
1178 | CONSUME_PEEKED_BYTE (); |
1179 | buf[1] = (scm_t_uint8) byte; | |
1180 | *len = 2; | |
1181 | ||
1182 | byte = scm_peek_byte_or_eof (port); | |
7b292a9d LC |
1183 | ASSERT_NOT_EOF (byte); |
1184 | ||
7be1705d LC |
1185 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80)) |
1186 | goto invalid_seq; | |
1187 | ||
1188 | CONSUME_PEEKED_BYTE (); | |
7b292a9d LC |
1189 | buf[2] = (scm_t_uint8) byte; |
1190 | *len = 3; | |
1191 | ||
7be1705d | 1192 | byte = scm_peek_byte_or_eof (port); |
7b292a9d LC |
1193 | ASSERT_NOT_EOF (byte); |
1194 | ||
7b292a9d LC |
1195 | if (SCM_UNLIKELY ((byte & 0xc0) != 0x80)) |
1196 | goto invalid_seq; | |
1197 | ||
7be1705d LC |
1198 | CONSUME_PEEKED_BYTE (); |
1199 | buf[3] = (scm_t_uint8) byte; | |
1200 | *len = 4; | |
1201 | ||
7b292a9d LC |
1202 | *codepoint = ((scm_t_wchar) buf[0] & 0x07) << 18UL |
1203 | | ((scm_t_wchar) buf[1] & 0x3f) << 12UL | |
1204 | | ((scm_t_wchar) buf[2] & 0x3f) << 6UL | |
1205 | | (buf[3] & 0x3f); | |
1206 | } | |
1207 | else | |
1208 | goto invalid_seq; | |
1209 | ||
1210 | return 0; | |
1211 | ||
1212 | invalid_seq: | |
7be1705d LC |
1213 | /* Here we could choose the consume the faulty byte when it's not a |
1214 | valid starting byte, but it's not a requirement. What Section 3.9 | |
1215 | of Unicode 6.0.0 mandates, though, is to not consume a byte that | |
1216 | would otherwise be a valid starting byte. */ | |
1217 | ||
7b292a9d LC |
1218 | return EILSEQ; |
1219 | ||
7be1705d | 1220 | #undef CONSUME_PEEKED_BYTE |
7b292a9d LC |
1221 | #undef ASSERT_NOT_EOF |
1222 | } | |
1223 | ||
1224 | /* Likewise, read a byte sequence from PORT, passing it through its | |
1225 | input conversion descriptor. */ | |
1226 | static int | |
1227 | get_iconv_codepoint (SCM port, scm_t_wchar *codepoint, | |
1228 | char buf[SCM_MBCHAR_BUF_SIZE], size_t *len) | |
1229 | { | |
1230 | scm_t_port *pt; | |
f4bc4e59 LC |
1231 | int err, byte_read; |
1232 | size_t bytes_consumed, output_size; | |
f4bc4e59 LC |
1233 | char *output; |
1234 | scm_t_uint8 utf8_buf[SCM_MBCHAR_BUF_SIZE]; | |
889975e5 | 1235 | |
7b292a9d | 1236 | pt = SCM_PTAB_ENTRY (port); |
889975e5 | 1237 | |
f4bc4e59 LC |
1238 | for (output_size = 0, output = (char *) utf8_buf, |
1239 | bytes_consumed = 0, err = 0; | |
1240 | err == 0 && output_size == 0 | |
1241 | && (bytes_consumed == 0 || byte_read != EOF); | |
1242 | bytes_consumed++) | |
63479112 | 1243 | { |
f4bc4e59 LC |
1244 | char *input; |
1245 | size_t input_left, output_left, done; | |
889975e5 | 1246 | |
f4bc4e59 LC |
1247 | byte_read = scm_get_byte_or_eof (port); |
1248 | if (byte_read == EOF) | |
889975e5 | 1249 | { |
f4bc4e59 | 1250 | if (bytes_consumed == 0) |
c62da8f8 LC |
1251 | { |
1252 | *codepoint = (scm_t_wchar) EOF; | |
1253 | *len = 0; | |
1254 | return 0; | |
1255 | } | |
f4bc4e59 LC |
1256 | else |
1257 | continue; | |
889975e5 MG |
1258 | } |
1259 | ||
f4bc4e59 | 1260 | buf[bytes_consumed] = byte_read; |
889975e5 | 1261 | |
f4bc4e59 LC |
1262 | input = buf; |
1263 | input_left = bytes_consumed + 1; | |
1264 | output_left = sizeof (utf8_buf); | |
889975e5 | 1265 | |
f4bc4e59 LC |
1266 | done = iconv (pt->input_cd, &input, &input_left, |
1267 | &output, &output_left); | |
1268 | if (done == (size_t) -1) | |
889975e5 | 1269 | { |
f4bc4e59 LC |
1270 | err = errno; |
1271 | if (err == EINVAL) | |
1272 | /* Missing input: keep trying. */ | |
1273 | err = 0; | |
889975e5 | 1274 | } |
f4bc4e59 LC |
1275 | else |
1276 | output_size = sizeof (utf8_buf) - output_left; | |
889975e5 MG |
1277 | } |
1278 | ||
a42d7971 LC |
1279 | if (SCM_UNLIKELY (output_size == 0)) |
1280 | /* An unterminated sequence. */ | |
1281 | err = EILSEQ; | |
7b292a9d | 1282 | else if (SCM_LIKELY (err == 0)) |
cc540d0b | 1283 | { |
7b292a9d LC |
1284 | /* Convert the UTF8_BUF sequence to a Unicode code point. */ |
1285 | *codepoint = utf8_to_codepoint (utf8_buf, output_size); | |
1286 | *len = bytes_consumed; | |
1287 | } | |
cc540d0b | 1288 | |
7b292a9d LC |
1289 | return err; |
1290 | } | |
c62da8f8 | 1291 | |
7b292a9d LC |
1292 | /* Read a codepoint from PORT and return it in *CODEPOINT. Fill BUF |
1293 | with the byte representation of the codepoint in PORT's encoding, and | |
1294 | set *LEN to the length in bytes of that representation. Return 0 on | |
1295 | success and an errno value on error. */ | |
1296 | static int | |
1297 | get_codepoint (SCM port, scm_t_wchar *codepoint, | |
1298 | char buf[SCM_MBCHAR_BUF_SIZE], size_t *len) | |
1299 | { | |
1300 | int err; | |
1301 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
1302 | ||
1303 | if (pt->input_cd == (iconv_t) -1) | |
1304 | /* Initialize the conversion descriptors, if needed. */ | |
1305 | scm_i_set_port_encoding_x (port, pt->encoding); | |
1306 | ||
1307 | /* FIXME: In 2.1, add a flag to determine whether a port is UTF-8. */ | |
1308 | if (pt->input_cd == (iconv_t) -1) | |
1309 | err = get_utf8_codepoint (port, codepoint, (scm_t_uint8 *) buf, len); | |
cc540d0b | 1310 | else |
7b292a9d LC |
1311 | err = get_iconv_codepoint (port, codepoint, buf, len); |
1312 | ||
1313 | if (SCM_LIKELY (err == 0)) | |
1314 | update_port_lf (*codepoint, port); | |
1315 | else if (pt->ilseq_handler == SCM_ICONVEH_QUESTION_MARK) | |
a42d7971 | 1316 | { |
7b292a9d LC |
1317 | *codepoint = '?'; |
1318 | err = 0; | |
a42d7971 LC |
1319 | update_port_lf (*codepoint, port); |
1320 | } | |
889975e5 | 1321 | |
c62da8f8 | 1322 | return err; |
889975e5 MG |
1323 | } |
1324 | ||
fd5eec2b LC |
1325 | /* Read a codepoint from PORT and return it. */ |
1326 | scm_t_wchar | |
1327 | scm_getc (SCM port) | |
c62da8f8 | 1328 | #define FUNC_NAME "scm_getc" |
fd5eec2b | 1329 | { |
c62da8f8 | 1330 | int err; |
fd5eec2b | 1331 | size_t len; |
c62da8f8 | 1332 | scm_t_wchar codepoint; |
fd5eec2b LC |
1333 | char buf[SCM_MBCHAR_BUF_SIZE]; |
1334 | ||
c62da8f8 LC |
1335 | err = get_codepoint (port, &codepoint, buf, &len); |
1336 | if (SCM_UNLIKELY (err != 0)) | |
1337 | /* At this point PORT should point past the invalid encoding, as per | |
1338 | R6RS-lib Section 8.2.4. */ | |
1339 | scm_decoding_error (FUNC_NAME, err, "input decoding error", port); | |
1340 | ||
1341 | return codepoint; | |
fd5eec2b | 1342 | } |
c62da8f8 | 1343 | #undef FUNC_NAME |
889975e5 | 1344 | |
5c070ca7 | 1345 | /* this should only be called when the read buffer is empty. it |
affc96b5 | 1346 | tries to refill the read buffer. it returns the first char from |
5c070ca7 | 1347 | the port, which is either EOF or *(pt->read_pos). */ |
6c951427 | 1348 | int |
affc96b5 | 1349 | scm_fill_input (SCM port) |
6c951427 | 1350 | { |
92c2555f | 1351 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
283a1a0e | 1352 | |
b5cb4464 NJ |
1353 | assert (pt->read_pos == pt->read_end); |
1354 | ||
6c951427 GH |
1355 | if (pt->read_buf == pt->putback_buf) |
1356 | { | |
1357 | /* finished reading put-back chars. */ | |
1358 | pt->read_buf = pt->saved_read_buf; | |
1359 | pt->read_pos = pt->saved_read_pos; | |
1360 | pt->read_end = pt->saved_read_end; | |
1361 | pt->read_buf_size = pt->saved_read_buf_size; | |
1362 | if (pt->read_pos < pt->read_end) | |
5c070ca7 | 1363 | return *(pt->read_pos); |
6c951427 | 1364 | } |
affc96b5 | 1365 | return scm_ptobs[SCM_PTOBNUM (port)].fill_input (port); |
6c951427 GH |
1366 | } |
1367 | ||
3cb988bd | 1368 | |
6fe692e9 MD |
1369 | /* scm_lfwrite |
1370 | * | |
53802ea8 MV |
1371 | * This function differs from scm_c_write; it updates port line and |
1372 | * column. */ | |
6fe692e9 | 1373 | |
9c44cd45 | 1374 | void |
1be6b49c | 1375 | scm_lfwrite (const char *ptr, size_t size, SCM port) |
ee149d03 | 1376 | { |
92c2555f MV |
1377 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
1378 | scm_t_ptob_descriptor *ptob = &scm_ptobs[SCM_PTOBNUM (port)]; | |
3e2043c4 | 1379 | |
840ae05d | 1380 | if (pt->rw_active == SCM_PORT_READ) |
affc96b5 | 1381 | scm_end_input (port); |
283a1a0e | 1382 | |
31703ab8 | 1383 | ptob->write (port, ptr, size); |
840ae05d | 1384 | |
9c44cd45 MG |
1385 | for (; size; ptr++, size--) |
1386 | update_port_lf ((scm_t_wchar) (unsigned char) *ptr, port); | |
1387 | ||
1388 | if (pt->rw_random) | |
1389 | pt->rw_active = SCM_PORT_WRITE; | |
1390 | } | |
1391 | ||
4325620f | 1392 | /* Write STR to PORT from START inclusive to END exclusive. */ |
9c44cd45 MG |
1393 | void |
1394 | scm_lfwrite_substr (SCM str, size_t start, size_t end, SCM port) | |
1395 | { | |
9c44cd45 | 1396 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
9c44cd45 MG |
1397 | |
1398 | if (pt->rw_active == SCM_PORT_READ) | |
1399 | scm_end_input (port); | |
1400 | ||
4325620f LC |
1401 | if (end == (size_t) -1) |
1402 | end = scm_i_string_length (str); | |
9c44cd45 | 1403 | |
4325620f | 1404 | scm_display (scm_c_substring (str, start, end), port); |
53802ea8 | 1405 | |
840ae05d JB |
1406 | if (pt->rw_random) |
1407 | pt->rw_active = SCM_PORT_WRITE; | |
ee149d03 | 1408 | } |
3cb988bd | 1409 | |
6fe692e9 MD |
1410 | /* scm_c_read |
1411 | * | |
1412 | * Used by an application to read arbitrary number of bytes from an | |
1413 | * SCM port. Same semantics as libc read, except that scm_c_read only | |
1414 | * returns less than SIZE bytes if at end-of-file. | |
1415 | * | |
1416 | * Warning: Doesn't update port line and column counts! */ | |
1417 | ||
b5cb4464 NJ |
1418 | /* This structure, and the following swap_buffer function, are used |
1419 | for temporarily swapping a port's own read buffer, and the buffer | |
1420 | that the caller of scm_c_read provides. */ | |
1421 | struct port_and_swap_buffer | |
1422 | { | |
1423 | scm_t_port *pt; | |
1424 | unsigned char *buffer; | |
1425 | size_t size; | |
1426 | }; | |
1427 | ||
1428 | static void | |
1429 | swap_buffer (void *data) | |
1430 | { | |
1431 | struct port_and_swap_buffer *psb = (struct port_and_swap_buffer *) data; | |
1432 | unsigned char *old_buf = psb->pt->read_buf; | |
1433 | size_t old_size = psb->pt->read_buf_size; | |
1434 | ||
1435 | /* Make the port use (buffer, size) from the struct. */ | |
1436 | psb->pt->read_pos = psb->pt->read_buf = psb->pt->read_end = psb->buffer; | |
1437 | psb->pt->read_buf_size = psb->size; | |
1438 | ||
1439 | /* Save the port's old (buffer, size) in the struct. */ | |
1440 | psb->buffer = old_buf; | |
1441 | psb->size = old_size; | |
1442 | } | |
1443 | ||
1be6b49c ML |
1444 | size_t |
1445 | scm_c_read (SCM port, void *buffer, size_t size) | |
693758d5 | 1446 | #define FUNC_NAME "scm_c_read" |
6fe692e9 | 1447 | { |
693758d5 | 1448 | scm_t_port *pt; |
1be6b49c | 1449 | size_t n_read = 0, n_available; |
b5cb4464 | 1450 | struct port_and_swap_buffer psb; |
6fe692e9 | 1451 | |
693758d5 LC |
1452 | SCM_VALIDATE_OPINPORT (1, port); |
1453 | ||
1454 | pt = SCM_PTAB_ENTRY (port); | |
6fe692e9 MD |
1455 | if (pt->rw_active == SCM_PORT_WRITE) |
1456 | scm_ptobs[SCM_PTOBNUM (port)].flush (port); | |
1457 | ||
1458 | if (pt->rw_random) | |
1459 | pt->rw_active = SCM_PORT_READ; | |
1460 | ||
b5cb4464 NJ |
1461 | /* Take bytes first from the port's read buffer. */ |
1462 | if (pt->read_pos < pt->read_end) | |
6fe692e9 | 1463 | { |
b5cb4464 | 1464 | n_available = min (size, pt->read_end - pt->read_pos); |
6fe692e9 | 1465 | memcpy (buffer, pt->read_pos, n_available); |
910d1e40 | 1466 | buffer = (char *) buffer + n_available; |
6fe692e9 MD |
1467 | pt->read_pos += n_available; |
1468 | n_read += n_available; | |
6fe692e9 | 1469 | size -= n_available; |
6fe692e9 MD |
1470 | } |
1471 | ||
b5cb4464 NJ |
1472 | /* Avoid the scm_dynwind_* costs if we now have enough data. */ |
1473 | if (size == 0) | |
1474 | return n_read; | |
1475 | ||
1476 | /* Now we will call scm_fill_input repeatedly until we have read the | |
1477 | requested number of bytes. (Note that a single scm_fill_input | |
1478 | call does not guarantee to fill the whole of the port's read | |
6d227556 | 1479 | buffer.) */ |
75192345 | 1480 | if (pt->read_buf_size <= 1 && pt->encoding == NULL) |
b5cb4464 | 1481 | { |
6d227556 NJ |
1482 | /* The port that we are reading from is unbuffered - i.e. does |
1483 | not have its own persistent buffer - but we have a buffer, | |
1484 | provided by our caller, that is the right size for the data | |
1485 | that is wanted. For the following scm_fill_input calls, | |
1486 | therefore, we use the buffer in hand as the port's read | |
1487 | buffer. | |
1488 | ||
1489 | We need to make sure that the port's normal (1 byte) buffer | |
1490 | is reinstated in case one of the scm_fill_input () calls | |
1491 | throws an exception; we use the scm_dynwind_* API to achieve | |
75192345 MG |
1492 | that. |
1493 | ||
1494 | A consequence of this optimization is that the fill_input | |
1495 | functions can't unget characters. That'll push data to the | |
1496 | pushback buffer instead of this psb buffer. */ | |
1497 | #if SCM_DEBUG == 1 | |
1498 | unsigned char *pback = pt->putback_buf; | |
1499 | #endif | |
6d227556 NJ |
1500 | psb.pt = pt; |
1501 | psb.buffer = buffer; | |
1502 | psb.size = size; | |
1503 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); | |
1504 | scm_dynwind_rewind_handler (swap_buffer, &psb, SCM_F_WIND_EXPLICITLY); | |
1505 | scm_dynwind_unwind_handler (swap_buffer, &psb, SCM_F_WIND_EXPLICITLY); | |
1506 | ||
1507 | /* Call scm_fill_input until we have all the bytes that we need, | |
1508 | or we hit EOF. */ | |
1509 | while (pt->read_buf_size && (scm_fill_input (port) != EOF)) | |
1510 | { | |
1511 | pt->read_buf_size -= (pt->read_end - pt->read_pos); | |
1512 | pt->read_pos = pt->read_buf = pt->read_end; | |
1513 | } | |
75192345 MG |
1514 | #if SCM_DEBUG == 1 |
1515 | if (pback != pt->putback_buf | |
1516 | || pt->read_buf - (unsigned char *) buffer < 0) | |
1517 | scm_misc_error (FUNC_NAME, | |
1518 | "scm_c_read must not call a fill function that pushes " | |
1519 | "back characters onto an unbuffered port", SCM_EOL); | |
1520 | #endif | |
6d227556 | 1521 | n_read += pt->read_buf - (unsigned char *) buffer; |
75192345 | 1522 | |
6d227556 NJ |
1523 | /* Reinstate the port's normal buffer. */ |
1524 | scm_dynwind_end (); | |
1525 | } | |
1526 | else | |
1527 | { | |
1528 | /* The port has its own buffer. It is important that we use it, | |
1529 | even if it happens to be smaller than our caller's buffer, so | |
1530 | that a custom port implementation's entry points (in | |
1531 | particular, fill_input) can rely on the buffer always being | |
1532 | the same as they first set up. */ | |
1533 | while (size && (scm_fill_input (port) != EOF)) | |
1534 | { | |
1535 | n_available = min (size, pt->read_end - pt->read_pos); | |
1536 | memcpy (buffer, pt->read_pos, n_available); | |
1537 | buffer = (char *) buffer + n_available; | |
1538 | pt->read_pos += n_available; | |
1539 | n_read += n_available; | |
1540 | size -= n_available; | |
1541 | } | |
1542 | } | |
6fe692e9 | 1543 | |
b5cb4464 | 1544 | return n_read; |
6fe692e9 | 1545 | } |
693758d5 | 1546 | #undef FUNC_NAME |
6fe692e9 MD |
1547 | |
1548 | /* scm_c_write | |
1549 | * | |
1550 | * Used by an application to write arbitrary number of bytes to an SCM | |
1551 | * port. Similar semantics as libc write. However, unlike libc | |
1552 | * write, scm_c_write writes the requested number of bytes and has no | |
1553 | * return value. | |
1554 | * | |
1555 | * Warning: Doesn't update port line and column counts! | |
1556 | */ | |
1557 | ||
693758d5 | 1558 | void |
1be6b49c | 1559 | scm_c_write (SCM port, const void *ptr, size_t size) |
693758d5 | 1560 | #define FUNC_NAME "scm_c_write" |
6fe692e9 | 1561 | { |
693758d5 LC |
1562 | scm_t_port *pt; |
1563 | scm_t_ptob_descriptor *ptob; | |
1564 | ||
1565 | SCM_VALIDATE_OPOUTPORT (1, port); | |
1566 | ||
1567 | pt = SCM_PTAB_ENTRY (port); | |
1568 | ptob = &scm_ptobs[SCM_PTOBNUM (port)]; | |
6fe692e9 MD |
1569 | |
1570 | if (pt->rw_active == SCM_PORT_READ) | |
1571 | scm_end_input (port); | |
1572 | ||
1573 | ptob->write (port, ptr, size); | |
1574 | ||
1575 | if (pt->rw_random) | |
1576 | pt->rw_active = SCM_PORT_WRITE; | |
1577 | } | |
693758d5 | 1578 | #undef FUNC_NAME |
3cb988bd | 1579 | |
fca43887 | 1580 | void |
a284e297 | 1581 | scm_flush (SCM port) |
ee149d03 | 1582 | { |
c014a02e | 1583 | long i = SCM_PTOBNUM (port); |
7f2a6c38 | 1584 | assert (i >= 0); |
affc96b5 | 1585 | (scm_ptobs[i].flush) (port); |
ee149d03 JB |
1586 | } |
1587 | ||
283a1a0e | 1588 | void |
a284e297 | 1589 | scm_end_input (SCM port) |
283a1a0e | 1590 | { |
c014a02e | 1591 | long offset; |
92c2555f | 1592 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
283a1a0e GH |
1593 | |
1594 | if (pt->read_buf == pt->putback_buf) | |
1595 | { | |
1596 | offset = pt->read_end - pt->read_pos; | |
1597 | pt->read_buf = pt->saved_read_buf; | |
1598 | pt->read_pos = pt->saved_read_pos; | |
1599 | pt->read_end = pt->saved_read_end; | |
1600 | pt->read_buf_size = pt->saved_read_buf_size; | |
1601 | } | |
1602 | else | |
1603 | offset = 0; | |
1604 | ||
affc96b5 | 1605 | scm_ptobs[SCM_PTOBNUM (port)].end_input (port, offset); |
283a1a0e GH |
1606 | } |
1607 | ||
ee149d03 JB |
1608 | \f |
1609 | ||
1610 | ||
1611 | void | |
889975e5 MG |
1612 | scm_unget_byte (int c, SCM port) |
1613 | #define FUNC_NAME "scm_unget_byte" | |
ee149d03 | 1614 | { |
92c2555f | 1615 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
840ae05d | 1616 | |
6c951427 GH |
1617 | if (pt->read_buf == pt->putback_buf) |
1618 | /* already using the put-back buffer. */ | |
1619 | { | |
1620 | /* enlarge putback_buf if necessary. */ | |
1621 | if (pt->read_end == pt->read_buf + pt->read_buf_size | |
1622 | && pt->read_buf == pt->read_pos) | |
1623 | { | |
1be6b49c | 1624 | size_t new_size = pt->read_buf_size * 2; |
c6c79933 | 1625 | unsigned char *tmp = (unsigned char *) |
4c9419ac MV |
1626 | scm_gc_realloc (pt->putback_buf, pt->read_buf_size, new_size, |
1627 | "putback buffer"); | |
6c951427 | 1628 | |
6c951427 GH |
1629 | pt->read_pos = pt->read_buf = pt->putback_buf = tmp; |
1630 | pt->read_end = pt->read_buf + pt->read_buf_size; | |
1631 | pt->read_buf_size = pt->putback_buf_size = new_size; | |
1632 | } | |
1633 | ||
1634 | /* shift any existing bytes to buffer + 1. */ | |
1635 | if (pt->read_pos == pt->read_end) | |
1636 | pt->read_end = pt->read_buf + 1; | |
1637 | else if (pt->read_pos != pt->read_buf + 1) | |
1638 | { | |
1639 | int count = pt->read_end - pt->read_pos; | |
1640 | ||
1641 | memmove (pt->read_buf + 1, pt->read_pos, count); | |
1642 | pt->read_end = pt->read_buf + 1 + count; | |
1643 | } | |
1644 | ||
1645 | pt->read_pos = pt->read_buf; | |
1646 | } | |
1647 | else | |
1648 | /* switch to the put-back buffer. */ | |
1649 | { | |
1650 | if (pt->putback_buf == NULL) | |
1651 | { | |
c357d546 | 1652 | pt->putback_buf |
92d8fd32 LC |
1653 | = (unsigned char *) scm_gc_malloc_pointerless |
1654 | (SCM_INITIAL_PUTBACK_BUF_SIZE, "putback buffer"); | |
6c951427 GH |
1655 | pt->putback_buf_size = SCM_INITIAL_PUTBACK_BUF_SIZE; |
1656 | } | |
1657 | ||
1658 | pt->saved_read_buf = pt->read_buf; | |
1659 | pt->saved_read_pos = pt->read_pos; | |
1660 | pt->saved_read_end = pt->read_end; | |
1661 | pt->saved_read_buf_size = pt->read_buf_size; | |
1662 | ||
1663 | pt->read_pos = pt->read_buf = pt->putback_buf; | |
1664 | pt->read_end = pt->read_buf + 1; | |
1665 | pt->read_buf_size = pt->putback_buf_size; | |
1666 | } | |
1667 | ||
1668 | *pt->read_buf = c; | |
ee149d03 | 1669 | |
840ae05d JB |
1670 | if (pt->rw_random) |
1671 | pt->rw_active = SCM_PORT_READ; | |
889975e5 MG |
1672 | } |
1673 | #undef FUNC_NAME | |
1674 | ||
63479112 | 1675 | void |
889975e5 MG |
1676 | scm_ungetc (scm_t_wchar c, SCM port) |
1677 | #define FUNC_NAME "scm_ungetc" | |
1678 | { | |
1679 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
63479112 LC |
1680 | char *result; |
1681 | char result_buf[10]; | |
1682 | const char *encoding; | |
889975e5 MG |
1683 | size_t len; |
1684 | int i; | |
1685 | ||
63479112 LC |
1686 | if (pt->encoding != NULL) |
1687 | encoding = pt->encoding; | |
1688 | else | |
1689 | encoding = "ISO-8859-1"; | |
1690 | ||
1691 | len = sizeof (result_buf); | |
1692 | result = u32_conv_to_encoding (encoding, | |
1693 | (enum iconv_ilseq_handler) pt->ilseq_handler, | |
1694 | (uint32_t *) &c, 1, NULL, | |
1695 | result_buf, &len); | |
1696 | ||
1697 | if (SCM_UNLIKELY (result == NULL || len == 0)) | |
6851d3be LC |
1698 | scm_encoding_error (FUNC_NAME, errno, |
1699 | "conversion to port encoding failed", | |
1700 | SCM_BOOL_F, SCM_MAKE_CHAR (c)); | |
63479112 | 1701 | |
889975e5 | 1702 | for (i = len - 1; i >= 0; i--) |
63479112 LC |
1703 | scm_unget_byte (result[i], port); |
1704 | ||
1705 | if (SCM_UNLIKELY (result != result_buf)) | |
1706 | free (result); | |
840ae05d | 1707 | |
ee149d03 JB |
1708 | if (c == '\n') |
1709 | { | |
1710 | /* What should col be in this case? | |
1711 | * We'll leave it at -1. | |
1712 | */ | |
1713 | SCM_LINUM (port) -= 1; | |
1714 | } | |
1715 | else | |
1716 | SCM_COL(port) -= 1; | |
1717 | } | |
c6c79933 | 1718 | #undef FUNC_NAME |
ee149d03 JB |
1719 | |
1720 | ||
1721 | void | |
70d63753 | 1722 | scm_ungets (const char *s, int n, SCM port) |
ee149d03 JB |
1723 | { |
1724 | /* This is simple minded and inefficient, but unreading strings is | |
1725 | * probably not a common operation, and remember that line and | |
1726 | * column numbers have to be handled... | |
1727 | * | |
1728 | * Please feel free to write an optimized version! | |
1729 | */ | |
1730 | while (n--) | |
1731 | scm_ungetc (s[n], port); | |
1732 | } | |
1733 | ||
1734 | ||
3b3b36dd | 1735 | SCM_DEFINE (scm_peek_char, "peek-char", 0, 1, 0, |
1bbd0b84 | 1736 | (SCM port), |
1e6808ea MG |
1737 | "Return the next character available from @var{port},\n" |
1738 | "@emph{without} updating @var{port} to point to the following\n" | |
1739 | "character. If no more characters are available, the\n" | |
c2dfff19 KR |
1740 | "end-of-file object is returned.\n" |
1741 | "\n" | |
1742 | "The value returned by\n" | |
1e6808ea MG |
1743 | "a call to @code{peek-char} is the same as the value that would\n" |
1744 | "have been returned by a call to @code{read-char} on the same\n" | |
1745 | "port. The only difference is that the very next call to\n" | |
1746 | "@code{read-char} or @code{peek-char} on that @var{port} will\n" | |
1747 | "return the value returned by the preceding call to\n" | |
1748 | "@code{peek-char}. In particular, a call to @code{peek-char} on\n" | |
1749 | "an interactive port will hang waiting for input whenever a call\n" | |
c62da8f8 LC |
1750 | "to @code{read-char} would have hung.\n" |
1751 | "\n" | |
1752 | "As for @code{read-char}, a @code{decoding-error} may be raised\n" | |
1753 | "if such a situation occurs. However, unlike with @code{read-char},\n" | |
1754 | "@var{port} still points at the beginning of the erroneous byte\n" | |
1755 | "sequence when the error is raised.\n") | |
1bbd0b84 | 1756 | #define FUNC_NAME s_scm_peek_char |
ee149d03 | 1757 | { |
c62da8f8 | 1758 | int err; |
fd5eec2b LC |
1759 | SCM result; |
1760 | scm_t_wchar c; | |
1761 | char bytes[SCM_MBCHAR_BUF_SIZE]; | |
c62da8f8 | 1762 | long column, line, i; |
fd5eec2b LC |
1763 | size_t len; |
1764 | ||
ee149d03 | 1765 | if (SCM_UNBNDP (port)) |
9de87eea | 1766 | port = scm_current_input_port (); |
b2456dd4 | 1767 | SCM_VALIDATE_OPINPORT (1, port); |
fd5eec2b LC |
1768 | |
1769 | column = SCM_COL (port); | |
1770 | line = SCM_LINUM (port); | |
1771 | ||
c62da8f8 | 1772 | err = get_codepoint (port, &c, bytes, &len); |
fd5eec2b | 1773 | |
c62da8f8 LC |
1774 | for (i = len - 1; i >= 0; i--) |
1775 | scm_unget_byte (bytes[i], port); | |
fd5eec2b | 1776 | |
c62da8f8 LC |
1777 | SCM_COL (port) = column; |
1778 | SCM_LINUM (port) = line; | |
fd5eec2b | 1779 | |
c62da8f8 LC |
1780 | if (SCM_UNLIKELY (err != 0)) |
1781 | { | |
1782 | scm_decoding_error (FUNC_NAME, err, "input decoding error", port); | |
1783 | ||
1784 | /* Shouldn't happen since `catch' always aborts to prompt. */ | |
1785 | result = SCM_BOOL_F; | |
fd5eec2b | 1786 | } |
c62da8f8 LC |
1787 | else if (c == EOF) |
1788 | result = SCM_EOF_VAL; | |
1789 | else | |
1790 | result = SCM_MAKE_CHAR (c); | |
fd5eec2b LC |
1791 | |
1792 | return result; | |
3cb988bd | 1793 | } |
1bbd0b84 | 1794 | #undef FUNC_NAME |
3cb988bd | 1795 | |
1be4270a | 1796 | SCM_DEFINE (scm_unread_char, "unread-char", 1, 1, 0, |
1bbd0b84 | 1797 | (SCM cobj, SCM port), |
b380b885 MD |
1798 | "Place @var{char} in @var{port} so that it will be read by the\n" |
1799 | "next read operation. If called multiple times, the unread characters\n" | |
1800 | "will be read again in last-in first-out order. If @var{port} is\n" | |
1801 | "not supplied, the current input port is used.") | |
1bbd0b84 | 1802 | #define FUNC_NAME s_scm_unread_char |
0f2d19dd JB |
1803 | { |
1804 | int c; | |
1805 | ||
34d19ef6 | 1806 | SCM_VALIDATE_CHAR (1, cobj); |
0f2d19dd | 1807 | if (SCM_UNBNDP (port)) |
9de87eea | 1808 | port = scm_current_input_port (); |
b2456dd4 | 1809 | SCM_VALIDATE_OPINPORT (2, port); |
0f2d19dd | 1810 | |
7866a09b | 1811 | c = SCM_CHAR (cobj); |
0f2d19dd | 1812 | |
b7f3516f | 1813 | scm_ungetc (c, port); |
0f2d19dd JB |
1814 | return cobj; |
1815 | } | |
1bbd0b84 | 1816 | #undef FUNC_NAME |
0f2d19dd | 1817 | |
a1ec6916 | 1818 | SCM_DEFINE (scm_unread_string, "unread-string", 2, 0, 0, |
1bbd0b84 | 1819 | (SCM str, SCM port), |
b380b885 MD |
1820 | "Place the string @var{str} in @var{port} so that its characters will be\n" |
1821 | "read in subsequent read operations. If called multiple times, the\n" | |
1822 | "unread characters will be read again in last-in first-out order. If\n" | |
1823 | "@var{port} is not supplied, the current-input-port is used.") | |
1bbd0b84 | 1824 | #define FUNC_NAME s_scm_unread_string |
ee1e7e13 | 1825 | { |
889975e5 | 1826 | int n; |
34d19ef6 | 1827 | SCM_VALIDATE_STRING (1, str); |
ee1e7e13 | 1828 | if (SCM_UNBNDP (port)) |
9de87eea | 1829 | port = scm_current_input_port (); |
b2456dd4 | 1830 | SCM_VALIDATE_OPINPORT (2, port); |
ee1e7e13 | 1831 | |
889975e5 MG |
1832 | n = scm_i_string_length (str); |
1833 | ||
1834 | while (n--) | |
1835 | scm_ungetc (scm_i_string_ref (str, n), port); | |
ee1e7e13 MD |
1836 | |
1837 | return str; | |
1838 | } | |
1bbd0b84 | 1839 | #undef FUNC_NAME |
ee1e7e13 | 1840 | |
a1ec6916 | 1841 | SCM_DEFINE (scm_seek, "seek", 3, 0, 0, |
1e6808ea MG |
1842 | (SCM fd_port, SCM offset, SCM whence), |
1843 | "Sets the current position of @var{fd/port} to the integer\n" | |
1844 | "@var{offset}, which is interpreted according to the value of\n" | |
1845 | "@var{whence}.\n" | |
1846 | "\n" | |
1847 | "One of the following variables should be supplied for\n" | |
1848 | "@var{whence}:\n" | |
b380b885 MD |
1849 | "@defvar SEEK_SET\n" |
1850 | "Seek from the beginning of the file.\n" | |
1851 | "@end defvar\n" | |
1852 | "@defvar SEEK_CUR\n" | |
1853 | "Seek from the current position.\n" | |
1854 | "@end defvar\n" | |
1855 | "@defvar SEEK_END\n" | |
1856 | "Seek from the end of the file.\n" | |
1e6808ea MG |
1857 | "@end defvar\n" |
1858 | "If @var{fd/port} is a file descriptor, the underlying system\n" | |
1859 | "call is @code{lseek}. @var{port} may be a string port.\n" | |
1860 | "\n" | |
1861 | "The value returned is the new position in the file. This means\n" | |
1862 | "that the current position of a port can be obtained using:\n" | |
1863 | "@lisp\n" | |
b380b885 | 1864 | "(seek port 0 SEEK_CUR)\n" |
1e6808ea | 1865 | "@end lisp") |
1bbd0b84 | 1866 | #define FUNC_NAME s_scm_seek |
840ae05d | 1867 | { |
840ae05d JB |
1868 | int how; |
1869 | ||
1e6808ea | 1870 | fd_port = SCM_COERCE_OUTPORT (fd_port); |
840ae05d | 1871 | |
a55c2b68 | 1872 | how = scm_to_int (whence); |
840ae05d | 1873 | if (how != SEEK_SET && how != SEEK_CUR && how != SEEK_END) |
1bbd0b84 | 1874 | SCM_OUT_OF_RANGE (3, whence); |
23f2b9a3 | 1875 | |
0a94eb00 | 1876 | if (SCM_OPPORTP (fd_port)) |
840ae05d | 1877 | { |
92c2555f | 1878 | scm_t_ptob_descriptor *ptob = scm_ptobs + SCM_PTOBNUM (fd_port); |
f1ce9199 LC |
1879 | off_t_or_off64_t off = scm_to_off_t_or_off64_t (offset); |
1880 | off_t_or_off64_t rv; | |
840ae05d JB |
1881 | |
1882 | if (!ptob->seek) | |
1bbd0b84 | 1883 | SCM_MISC_ERROR ("port is not seekable", |
1e6808ea | 1884 | scm_cons (fd_port, SCM_EOL)); |
840ae05d | 1885 | else |
1e6808ea | 1886 | rv = ptob->seek (fd_port, off, how); |
f1ce9199 | 1887 | return scm_from_off_t_or_off64_t (rv); |
840ae05d JB |
1888 | } |
1889 | else /* file descriptor?. */ | |
1890 | { | |
23f2b9a3 KR |
1891 | off_t_or_off64_t off = scm_to_off_t_or_off64_t (offset); |
1892 | off_t_or_off64_t rv; | |
1893 | rv = lseek_or_lseek64 (scm_to_int (fd_port), off, how); | |
840ae05d | 1894 | if (rv == -1) |
1bbd0b84 | 1895 | SCM_SYSERROR; |
23f2b9a3 | 1896 | return scm_from_off_t_or_off64_t (rv); |
840ae05d | 1897 | } |
840ae05d | 1898 | } |
1bbd0b84 | 1899 | #undef FUNC_NAME |
840ae05d | 1900 | |
8ab3d8a0 KR |
1901 | #ifndef O_BINARY |
1902 | #define O_BINARY 0 | |
1903 | #endif | |
1904 | ||
1905 | /* Mingw has ftruncate(), perhaps implemented above using chsize, but | |
1906 | doesn't have the filename version truncate(), hence this code. */ | |
1907 | #if HAVE_FTRUNCATE && ! HAVE_TRUNCATE | |
1908 | static int | |
1909 | truncate (const char *file, off_t length) | |
82893676 | 1910 | { |
8ab3d8a0 KR |
1911 | int ret, fdes; |
1912 | ||
1913 | fdes = open (file, O_BINARY | O_WRONLY); | |
1914 | if (fdes == -1) | |
1915 | return -1; | |
1916 | ||
1917 | ret = ftruncate (fdes, length); | |
1918 | if (ret == -1) | |
82893676 | 1919 | { |
8ab3d8a0 | 1920 | int save_errno = errno; |
82893676 | 1921 | close (fdes); |
8ab3d8a0 KR |
1922 | errno = save_errno; |
1923 | return -1; | |
82893676 | 1924 | } |
8ab3d8a0 KR |
1925 | |
1926 | return close (fdes); | |
82893676 | 1927 | } |
8ab3d8a0 | 1928 | #endif /* HAVE_FTRUNCATE && ! HAVE_TRUNCATE */ |
82893676 | 1929 | |
a1ec6916 | 1930 | SCM_DEFINE (scm_truncate_file, "truncate-file", 1, 1, 0, |
1bbd0b84 | 1931 | (SCM object, SCM length), |
8ab3d8a0 KR |
1932 | "Truncate @var{file} to @var{length} bytes. @var{file} can be a\n" |
1933 | "filename string, a port object, or an integer file descriptor.\n" | |
1934 | "The return value is unspecified.\n" | |
1935 | "\n" | |
1936 | "For a port or file descriptor @var{length} can be omitted, in\n" | |
1937 | "which case the file is truncated at the current position (per\n" | |
1938 | "@code{ftell} above).\n" | |
1939 | "\n" | |
1940 | "On most systems a file can be extended by giving a length\n" | |
1941 | "greater than the current size, but this is not mandatory in the\n" | |
1942 | "POSIX standard.") | |
1bbd0b84 | 1943 | #define FUNC_NAME s_scm_truncate_file |
840ae05d | 1944 | { |
69bc9ff3 | 1945 | int rv; |
69bc9ff3 | 1946 | |
2b829bbb KR |
1947 | /* "object" can be a port, fdes or filename. |
1948 | ||
1949 | Negative "length" makes no sense, but it's left to truncate() or | |
1950 | ftruncate() to give back an error for that (normally EINVAL). | |
1951 | */ | |
840ae05d | 1952 | |
840ae05d JB |
1953 | if (SCM_UNBNDP (length)) |
1954 | { | |
69bc9ff3 | 1955 | /* must supply length if object is a filename. */ |
7f9994d9 | 1956 | if (scm_is_string (object)) |
34d19ef6 | 1957 | SCM_MISC_ERROR("must supply length if OBJECT is a filename", SCM_EOL); |
69bc9ff3 | 1958 | |
e11e83f3 | 1959 | length = scm_seek (object, SCM_INUM0, scm_from_int (SEEK_CUR)); |
840ae05d | 1960 | } |
3fe6190f | 1961 | |
69bc9ff3 | 1962 | object = SCM_COERCE_OUTPORT (object); |
e11e83f3 | 1963 | if (scm_is_integer (object)) |
69bc9ff3 | 1964 | { |
23f2b9a3 KR |
1965 | off_t_or_off64_t c_length = scm_to_off_t_or_off64_t (length); |
1966 | SCM_SYSCALL (rv = ftruncate_or_ftruncate64 (scm_to_int (object), | |
1967 | c_length)); | |
69bc9ff3 | 1968 | } |
0c95b57d | 1969 | else if (SCM_OPOUTPORTP (object)) |
69bc9ff3 | 1970 | { |
f1ce9199 | 1971 | off_t_or_off64_t c_length = scm_to_off_t_or_off64_t (length); |
92c2555f MV |
1972 | scm_t_port *pt = SCM_PTAB_ENTRY (object); |
1973 | scm_t_ptob_descriptor *ptob = scm_ptobs + SCM_PTOBNUM (object); | |
69bc9ff3 | 1974 | |
affc96b5 | 1975 | if (!ptob->truncate) |
1bbd0b84 | 1976 | SCM_MISC_ERROR ("port is not truncatable", SCM_EOL); |
69bc9ff3 | 1977 | if (pt->rw_active == SCM_PORT_READ) |
affc96b5 | 1978 | scm_end_input (object); |
69bc9ff3 | 1979 | else if (pt->rw_active == SCM_PORT_WRITE) |
affc96b5 | 1980 | ptob->flush (object); |
69bc9ff3 | 1981 | |
affc96b5 | 1982 | ptob->truncate (object, c_length); |
69bc9ff3 GH |
1983 | rv = 0; |
1984 | } | |
1985 | else | |
1986 | { | |
2b829bbb | 1987 | off_t_or_off64_t c_length = scm_to_off_t_or_off64_t (length); |
7f9994d9 MV |
1988 | char *str = scm_to_locale_string (object); |
1989 | int eno; | |
2b829bbb | 1990 | SCM_SYSCALL (rv = truncate_or_truncate64 (str, c_length)); |
7f9994d9 MV |
1991 | eno = errno; |
1992 | free (str); | |
1993 | errno = eno; | |
69bc9ff3 GH |
1994 | } |
1995 | if (rv == -1) | |
1bbd0b84 | 1996 | SCM_SYSERROR; |
840ae05d JB |
1997 | return SCM_UNSPECIFIED; |
1998 | } | |
1bbd0b84 | 1999 | #undef FUNC_NAME |
840ae05d | 2000 | |
a1ec6916 | 2001 | SCM_DEFINE (scm_port_line, "port-line", 1, 0, 0, |
1bbd0b84 | 2002 | (SCM port), |
a150979d KR |
2003 | "Return the current line number for @var{port}.\n" |
2004 | "\n" | |
2005 | "The first line of a file is 0. But you might want to add 1\n" | |
2006 | "when printing line numbers, since starting from 1 is\n" | |
2007 | "traditional in error messages, and likely to be more natural to\n" | |
2008 | "non-programmers.") | |
1bbd0b84 | 2009 | #define FUNC_NAME s_scm_port_line |
0f2d19dd | 2010 | { |
78446828 | 2011 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 2012 | SCM_VALIDATE_OPENPORT (1, port); |
651f2cd2 | 2013 | return scm_from_long (SCM_LINUM (port)); |
0f2d19dd | 2014 | } |
1bbd0b84 | 2015 | #undef FUNC_NAME |
0f2d19dd | 2016 | |
a1ec6916 | 2017 | SCM_DEFINE (scm_set_port_line_x, "set-port-line!", 2, 0, 0, |
1bbd0b84 | 2018 | (SCM port, SCM line), |
a150979d KR |
2019 | "Set the current line number for @var{port} to @var{line}. The\n" |
2020 | "first line of a file is 0.") | |
1bbd0b84 | 2021 | #define FUNC_NAME s_scm_set_port_line_x |
d043d8c2 | 2022 | { |
360fc44c | 2023 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 2024 | SCM_VALIDATE_OPENPORT (1, port); |
651f2cd2 | 2025 | SCM_PTAB_ENTRY (port)->line_number = scm_to_long (line); |
564478fd | 2026 | return SCM_UNSPECIFIED; |
d043d8c2 | 2027 | } |
1bbd0b84 | 2028 | #undef FUNC_NAME |
d043d8c2 | 2029 | |
a1ec6916 | 2030 | SCM_DEFINE (scm_port_column, "port-column", 1, 0, 0, |
1bbd0b84 | 2031 | (SCM port), |
a150979d KR |
2032 | "Return the current column number of @var{port}.\n" |
2033 | "If the number is\n" | |
b380b885 MD |
2034 | "unknown, the result is #f. Otherwise, the result is a 0-origin integer\n" |
2035 | "- i.e. the first character of the first line is line 0, column 0.\n" | |
2036 | "(However, when you display a file position, for example in an error\n" | |
650a1cf9 | 2037 | "message, we recommend you add 1 to get 1-origin integers. This is\n" |
b380b885 MD |
2038 | "because lines and column numbers traditionally start with 1, and that is\n" |
2039 | "what non-programmers will find most natural.)") | |
1bbd0b84 | 2040 | #define FUNC_NAME s_scm_port_column |
0f2d19dd | 2041 | { |
78446828 | 2042 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 2043 | SCM_VALIDATE_OPENPORT (1, port); |
e11e83f3 | 2044 | return scm_from_int (SCM_COL (port)); |
0f2d19dd | 2045 | } |
1bbd0b84 | 2046 | #undef FUNC_NAME |
0f2d19dd | 2047 | |
a1ec6916 | 2048 | SCM_DEFINE (scm_set_port_column_x, "set-port-column!", 2, 0, 0, |
1bbd0b84 | 2049 | (SCM port, SCM column), |
a150979d KR |
2050 | "Set the current column of @var{port}. Before reading the first\n" |
2051 | "character on a line the column should be 0.") | |
1bbd0b84 | 2052 | #define FUNC_NAME s_scm_set_port_column_x |
d043d8c2 | 2053 | { |
360fc44c | 2054 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 2055 | SCM_VALIDATE_OPENPORT (1, port); |
a55c2b68 | 2056 | SCM_PTAB_ENTRY (port)->column_number = scm_to_int (column); |
564478fd | 2057 | return SCM_UNSPECIFIED; |
d043d8c2 | 2058 | } |
1bbd0b84 | 2059 | #undef FUNC_NAME |
d043d8c2 | 2060 | |
a1ec6916 | 2061 | SCM_DEFINE (scm_port_filename, "port-filename", 1, 0, 0, |
1bbd0b84 | 2062 | (SCM port), |
ac012a27 AW |
2063 | "Return the filename associated with @var{port}, or @code{#f}\n" |
2064 | "if no filename is associated with the port.") | |
1bbd0b84 | 2065 | #define FUNC_NAME s_scm_port_filename |
0f2d19dd | 2066 | { |
78446828 | 2067 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 2068 | SCM_VALIDATE_OPENPORT (1, port); |
b24b5e13 | 2069 | return SCM_FILENAME (port); |
0f2d19dd | 2070 | } |
1bbd0b84 | 2071 | #undef FUNC_NAME |
0f2d19dd | 2072 | |
a1ec6916 | 2073 | SCM_DEFINE (scm_set_port_filename_x, "set-port-filename!", 2, 0, 0, |
1bbd0b84 | 2074 | (SCM port, SCM filename), |
b380b885 MD |
2075 | "Change the filename associated with @var{port}, using the current input\n" |
2076 | "port if none is specified. Note that this does not change the port's\n" | |
2077 | "source of data, but only the value that is returned by\n" | |
2078 | "@code{port-filename} and reported in diagnostic output.") | |
1bbd0b84 | 2079 | #define FUNC_NAME s_scm_set_port_filename_x |
d14af9f2 | 2080 | { |
360fc44c | 2081 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 2082 | SCM_VALIDATE_OPENPORT (1, port); |
360fc44c | 2083 | /* We allow the user to set the filename to whatever he likes. */ |
b24b5e13 DH |
2084 | SCM_SET_FILENAME (port, filename); |
2085 | return SCM_UNSPECIFIED; | |
d14af9f2 | 2086 | } |
1bbd0b84 | 2087 | #undef FUNC_NAME |
d14af9f2 | 2088 | |
d6a6989e LC |
2089 | /* A fluid specifying the default encoding for newly created ports. If it is |
2090 | a string, that is the encoding. If it is #f, it is in the "native" | |
2091 | (Latin-1) encoding. */ | |
2092 | SCM_VARIABLE (default_port_encoding_var, "%default-port-encoding"); | |
2093 | ||
889975e5 MG |
2094 | static int scm_port_encoding_init = 0; |
2095 | ||
9d9c66ba LC |
2096 | /* Use ENCODING as the default encoding for future ports. */ |
2097 | void | |
2098 | scm_i_set_default_port_encoding (const char *encoding) | |
2099 | { | |
2100 | if (!scm_port_encoding_init | |
2101 | || !scm_is_fluid (SCM_VARIABLE_REF (default_port_encoding_var))) | |
2102 | scm_misc_error (NULL, "tried to set port encoding fluid before it is initialized", | |
2103 | SCM_EOL); | |
2104 | ||
2105 | if (encoding == NULL | |
2106 | || !strcmp (encoding, "ASCII") | |
2107 | || !strcmp (encoding, "ANSI_X3.4-1968") | |
2108 | || !strcmp (encoding, "ISO-8859-1")) | |
2109 | scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var), SCM_BOOL_F); | |
2110 | else | |
2111 | scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var), | |
2112 | scm_from_locale_string (encoding)); | |
2113 | } | |
2114 | ||
2115 | /* Return the name of the default encoding for newly created ports; a | |
2116 | return value of NULL means "ISO-8859-1". */ | |
889975e5 | 2117 | const char * |
9d9c66ba | 2118 | scm_i_default_port_encoding (void) |
889975e5 | 2119 | { |
9d9c66ba LC |
2120 | if (!scm_port_encoding_init) |
2121 | return NULL; | |
2122 | else if (!scm_is_fluid (SCM_VARIABLE_REF (default_port_encoding_var))) | |
2123 | return NULL; | |
2124 | else | |
889975e5 | 2125 | { |
9d9c66ba LC |
2126 | SCM encoding; |
2127 | ||
2128 | encoding = scm_fluid_ref (SCM_VARIABLE_REF (default_port_encoding_var)); | |
2129 | if (!scm_is_string (encoding)) | |
889975e5 MG |
2130 | return NULL; |
2131 | else | |
9d9c66ba | 2132 | return scm_i_string_chars (encoding); |
889975e5 MG |
2133 | } |
2134 | } | |
2135 | ||
889975e5 | 2136 | void |
064c27c4 | 2137 | scm_i_set_port_encoding_x (SCM port, const char *encoding) |
889975e5 | 2138 | { |
889975e5 | 2139 | scm_t_port *pt; |
9d9c66ba | 2140 | iconv_t new_input_cd, new_output_cd; |
889975e5 | 2141 | |
9d9c66ba LC |
2142 | new_input_cd = (iconv_t) -1; |
2143 | new_output_cd = (iconv_t) -1; | |
f4bc4e59 | 2144 | |
9d9c66ba LC |
2145 | /* Set the character encoding for this port. */ |
2146 | pt = SCM_PTAB_ENTRY (port); | |
f4bc4e59 | 2147 | |
9d9c66ba LC |
2148 | if (encoding == NULL) |
2149 | encoding = "ISO-8859-1"; | |
f4bc4e59 | 2150 | |
7b292a9d LC |
2151 | if (pt->encoding != encoding) |
2152 | pt->encoding = scm_gc_strdup (encoding, "port"); | |
d9544bf0 | 2153 | |
7b292a9d LC |
2154 | /* If ENCODING is UTF-8, then no conversion descriptor is opened |
2155 | because we do I/O ourselves. This saves 100+ KiB for each | |
2156 | descriptor. */ | |
2157 | if (strcmp (encoding, "UTF-8")) | |
9d9c66ba | 2158 | { |
7b292a9d LC |
2159 | if (SCM_CELL_WORD_0 (port) & SCM_RDNG) |
2160 | { | |
2161 | /* Open an input iconv conversion descriptor, from ENCODING | |
2162 | to UTF-8. We choose UTF-8, not UTF-32, because iconv | |
2163 | implementations can typically convert from anything to | |
2164 | UTF-8, but not to UTF-32 (see | |
2165 | <http://lists.gnu.org/archive/html/bug-libunistring/2010-09/msg00007.html>). */ | |
2166 | new_input_cd = iconv_open ("UTF-8", encoding); | |
2167 | if (new_input_cd == (iconv_t) -1) | |
2168 | goto invalid_encoding; | |
2169 | } | |
f4bc4e59 | 2170 | |
7b292a9d | 2171 | if (SCM_CELL_WORD_0 (port) & SCM_WRTNG) |
f4bc4e59 | 2172 | { |
7b292a9d LC |
2173 | new_output_cd = iconv_open (encoding, "UTF-8"); |
2174 | if (new_output_cd == (iconv_t) -1) | |
2175 | { | |
2176 | if (new_input_cd != (iconv_t) -1) | |
2177 | iconv_close (new_input_cd); | |
2178 | goto invalid_encoding; | |
2179 | } | |
f4bc4e59 | 2180 | } |
9d9c66ba | 2181 | } |
f4bc4e59 | 2182 | |
9d9c66ba LC |
2183 | if (pt->input_cd != (iconv_t) -1) |
2184 | iconv_close (pt->input_cd); | |
2185 | if (pt->output_cd != (iconv_t) -1) | |
2186 | iconv_close (pt->output_cd); | |
f4bc4e59 | 2187 | |
9d9c66ba LC |
2188 | pt->input_cd = new_input_cd; |
2189 | pt->output_cd = new_output_cd; | |
f4bc4e59 LC |
2190 | |
2191 | return; | |
2192 | ||
2193 | invalid_encoding: | |
2194 | { | |
2195 | SCM err; | |
064c27c4 LC |
2196 | err = scm_from_locale_string (encoding); |
2197 | scm_misc_error ("scm_i_set_port_encoding_x", | |
2198 | "invalid or unknown character encoding ~s", | |
f4bc4e59 LC |
2199 | scm_list_1 (err)); |
2200 | } | |
889975e5 MG |
2201 | } |
2202 | ||
2203 | SCM_DEFINE (scm_port_encoding, "port-encoding", 1, 0, 0, | |
2204 | (SCM port), | |
2205 | "Returns, as a string, the character encoding that @var{port}\n" | |
2206 | "uses to interpret its input and output.\n") | |
2207 | #define FUNC_NAME s_scm_port_encoding | |
2208 | { | |
2209 | scm_t_port *pt; | |
2210 | const char *enc; | |
2211 | ||
2212 | SCM_VALIDATE_PORT (1, port); | |
2213 | ||
2214 | pt = SCM_PTAB_ENTRY (port); | |
9d9c66ba | 2215 | enc = pt->encoding; |
889975e5 MG |
2216 | if (enc) |
2217 | return scm_from_locale_string (pt->encoding); | |
2218 | else | |
0af34a3f | 2219 | return SCM_BOOL_F; |
889975e5 MG |
2220 | } |
2221 | #undef FUNC_NAME | |
d6a6989e | 2222 | |
889975e5 MG |
2223 | SCM_DEFINE (scm_set_port_encoding_x, "set-port-encoding!", 2, 0, 0, |
2224 | (SCM port, SCM enc), | |
2225 | "Sets the character encoding that will be used to interpret all\n" | |
2226 | "port I/O. New ports are created with the encoding\n" | |
2227 | "appropriate for the current locale if @code{setlocale} has \n" | |
2228 | "been called or ISO-8859-1 otherwise\n" | |
2229 | "and this procedure can be used to modify that encoding.\n") | |
889975e5 MG |
2230 | #define FUNC_NAME s_scm_set_port_encoding_x |
2231 | { | |
2232 | char *enc_str; | |
889975e5 MG |
2233 | |
2234 | SCM_VALIDATE_PORT (1, port); | |
2235 | SCM_VALIDATE_STRING (2, enc); | |
2236 | ||
2237 | enc_str = scm_to_locale_string (enc); | |
da288f50 | 2238 | scm_i_set_port_encoding_x (port, enc_str); |
3e05fc04 | 2239 | free (enc_str); |
da288f50 | 2240 | |
889975e5 MG |
2241 | return SCM_UNSPECIFIED; |
2242 | } | |
2243 | #undef FUNC_NAME | |
2244 | ||
2245 | ||
2246 | /* This determines how conversions handle unconvertible characters. */ | |
2247 | SCM_GLOBAL_VARIABLE (scm_conversion_strategy, "%port-conversion-strategy"); | |
2248 | static int scm_conversion_strategy_init = 0; | |
2249 | ||
2250 | scm_t_string_failed_conversion_handler | |
2251 | scm_i_get_conversion_strategy (SCM port) | |
2252 | { | |
2253 | SCM encoding; | |
2254 | ||
2255 | if (scm_is_false (port)) | |
2256 | { | |
2257 | if (!scm_conversion_strategy_init | |
2258 | || !scm_is_fluid (SCM_VARIABLE_REF (scm_conversion_strategy))) | |
2259 | return SCM_FAILED_CONVERSION_QUESTION_MARK; | |
2260 | else | |
2261 | { | |
2262 | encoding = scm_fluid_ref (SCM_VARIABLE_REF (scm_conversion_strategy)); | |
2263 | if (scm_is_false (encoding)) | |
2264 | return SCM_FAILED_CONVERSION_QUESTION_MARK; | |
2265 | else | |
2266 | return (scm_t_string_failed_conversion_handler) scm_to_int (encoding); | |
2267 | } | |
2268 | } | |
2269 | else | |
2270 | { | |
2271 | scm_t_port *pt; | |
2272 | pt = SCM_PTAB_ENTRY (port); | |
e1ee45e7 | 2273 | return pt->ilseq_handler; |
889975e5 MG |
2274 | } |
2275 | ||
2276 | } | |
2277 | ||
2278 | void | |
2279 | scm_i_set_conversion_strategy_x (SCM port, | |
2280 | scm_t_string_failed_conversion_handler handler) | |
2281 | { | |
2282 | SCM strategy; | |
2283 | scm_t_port *pt; | |
2284 | ||
2285 | strategy = scm_from_int ((int) handler); | |
2286 | ||
2287 | if (scm_is_false (port)) | |
2288 | { | |
2289 | /* Set the default encoding for future ports. */ | |
2e16a342 | 2290 | if (!scm_conversion_strategy_init |
889975e5 MG |
2291 | || !scm_is_fluid (SCM_VARIABLE_REF (scm_conversion_strategy))) |
2292 | scm_misc_error (NULL, "tried to set conversion strategy fluid before it is initialized", | |
2293 | SCM_EOL); | |
2294 | scm_fluid_set_x (SCM_VARIABLE_REF (scm_conversion_strategy), strategy); | |
2295 | } | |
2296 | else | |
2297 | { | |
2298 | /* Set the character encoding for this port. */ | |
2299 | pt = SCM_PTAB_ENTRY (port); | |
2300 | pt->ilseq_handler = handler; | |
2301 | } | |
2302 | } | |
2303 | ||
2304 | SCM_DEFINE (scm_port_conversion_strategy, "port-conversion-strategy", | |
2305 | 1, 0, 0, (SCM port), | |
2306 | "Returns the behavior of the port when handling a character that\n" | |
2307 | "is not representable in the port's current encoding.\n" | |
2308 | "It returns the symbol @code{error} if unrepresentable characters\n" | |
2309 | "should cause exceptions, @code{substitute} if the port should\n" | |
2310 | "try to replace unrepresentable characters with question marks or\n" | |
2311 | "approximate characters, or @code{escape} if unrepresentable\n" | |
2312 | "characters should be converted to string escapes.\n" | |
2313 | "\n" | |
2314 | "If @var{port} is @code{#f}, then the current default behavior\n" | |
2315 | "will be returned. New ports will have this default behavior\n" | |
2316 | "when they are created.\n") | |
2317 | #define FUNC_NAME s_scm_port_conversion_strategy | |
2318 | { | |
2319 | scm_t_string_failed_conversion_handler h; | |
2320 | ||
2321 | SCM_VALIDATE_OPPORT (1, port); | |
2322 | ||
2323 | if (!scm_is_false (port)) | |
2324 | { | |
2325 | SCM_VALIDATE_OPPORT (1, port); | |
2326 | } | |
2327 | ||
2328 | h = scm_i_get_conversion_strategy (port); | |
2329 | if (h == SCM_FAILED_CONVERSION_ERROR) | |
4a655e50 | 2330 | return scm_from_latin1_symbol ("error"); |
889975e5 | 2331 | else if (h == SCM_FAILED_CONVERSION_QUESTION_MARK) |
4a655e50 | 2332 | return scm_from_latin1_symbol ("substitute"); |
889975e5 | 2333 | else if (h == SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE) |
4a655e50 | 2334 | return scm_from_latin1_symbol ("escape"); |
889975e5 MG |
2335 | else |
2336 | abort (); | |
2337 | ||
2338 | /* Never gets here. */ | |
2339 | return SCM_UNDEFINED; | |
2340 | } | |
2341 | #undef FUNC_NAME | |
2342 | ||
2343 | SCM_DEFINE (scm_set_port_conversion_strategy_x, "set-port-conversion-strategy!", | |
2344 | 2, 0, 0, | |
2345 | (SCM port, SCM sym), | |
2346 | "Sets the behavior of the interpreter when outputting a character\n" | |
2347 | "that is not representable in the port's current encoding.\n" | |
2348 | "@var{sym} can be either @code{'error}, @code{'substitute}, or\n" | |
2349 | "@code{'escape}. If it is @code{'error}, an error will be thrown\n" | |
2350 | "when an unconvertible character is encountered. If it is\n" | |
2351 | "@code{'substitute}, then unconvertible characters will \n" | |
2352 | "be replaced with approximate characters, or with question marks\n" | |
2353 | "if no approximately correct character is available.\n" | |
2354 | "If it is @code{'escape},\n" | |
2355 | "it will appear as a hex escape when output.\n" | |
2356 | "\n" | |
2357 | "If @var{port} is an open port, the conversion error behavior\n" | |
2358 | "is set for that port. If it is @code{#f}, it is set as the\n" | |
2359 | "default behavior for any future ports that get created in\n" | |
2360 | "this thread.\n") | |
2361 | #define FUNC_NAME s_scm_set_port_conversion_strategy_x | |
2362 | { | |
2363 | SCM err; | |
2364 | SCM qm; | |
2365 | SCM esc; | |
2366 | ||
2367 | if (!scm_is_false (port)) | |
2368 | { | |
2369 | SCM_VALIDATE_OPPORT (1, port); | |
2370 | } | |
2371 | ||
4a655e50 | 2372 | err = scm_from_latin1_symbol ("error"); |
889975e5 MG |
2373 | if (scm_is_true (scm_eqv_p (sym, err))) |
2374 | { | |
2375 | scm_i_set_conversion_strategy_x (port, SCM_FAILED_CONVERSION_ERROR); | |
2376 | return SCM_UNSPECIFIED; | |
2377 | } | |
2378 | ||
4a655e50 | 2379 | qm = scm_from_latin1_symbol ("substitute"); |
889975e5 MG |
2380 | if (scm_is_true (scm_eqv_p (sym, qm))) |
2381 | { | |
2382 | scm_i_set_conversion_strategy_x (port, | |
2383 | SCM_FAILED_CONVERSION_QUESTION_MARK); | |
2384 | return SCM_UNSPECIFIED; | |
2385 | } | |
2386 | ||
4a655e50 | 2387 | esc = scm_from_latin1_symbol ("escape"); |
889975e5 MG |
2388 | if (scm_is_true (scm_eqv_p (sym, esc))) |
2389 | { | |
2390 | scm_i_set_conversion_strategy_x (port, | |
2391 | SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE); | |
2392 | return SCM_UNSPECIFIED; | |
2393 | } | |
2394 | ||
2395 | SCM_MISC_ERROR ("unknown conversion behavior ~s", scm_list_1 (sym)); | |
2396 | ||
2397 | return SCM_UNSPECIFIED; | |
2398 | } | |
2399 | #undef FUNC_NAME | |
2400 | ||
2401 | ||
2402 | ||
f12733c9 MD |
2403 | void |
2404 | scm_print_port_mode (SCM exp, SCM port) | |
2405 | { | |
2406 | scm_puts (SCM_CLOSEDP (exp) | |
2407 | ? "closed: " | |
f9a64404 DH |
2408 | : (SCM_RDNG & SCM_CELL_WORD_0 (exp) |
2409 | ? (SCM_WRTNG & SCM_CELL_WORD_0 (exp) | |
f12733c9 MD |
2410 | ? "input-output: " |
2411 | : "input: ") | |
f9a64404 | 2412 | : (SCM_WRTNG & SCM_CELL_WORD_0 (exp) |
f12733c9 MD |
2413 | ? "output: " |
2414 | : "bogus: ")), | |
2415 | port); | |
2416 | } | |
1cc91f1b | 2417 | |
f12733c9 | 2418 | int |
e81d98ec | 2419 | scm_port_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) |
0f2d19dd | 2420 | { |
f12733c9 MD |
2421 | char *type = SCM_PTOBNAME (SCM_PTOBNUM (exp)); |
2422 | if (!type) | |
2423 | type = "port"; | |
b7f3516f | 2424 | scm_puts ("#<", port); |
f12733c9 | 2425 | scm_print_port_mode (exp, port); |
b7f3516f TT |
2426 | scm_puts (type, port); |
2427 | scm_putc (' ', port); | |
0345e278 | 2428 | scm_uintprint (SCM_CELL_WORD_1 (exp), 16, port); |
b7f3516f | 2429 | scm_putc ('>', port); |
f12733c9 | 2430 | return 1; |
0f2d19dd JB |
2431 | } |
2432 | ||
0f2d19dd | 2433 | \f |
ee149d03 | 2434 | |
d68fee48 | 2435 | /* Void ports. */ |
0f2d19dd | 2436 | |
92c2555f | 2437 | scm_t_bits scm_tc16_void_port = 0; |
0f2d19dd | 2438 | |
e81d98ec | 2439 | static int fill_input_void_port (SCM port SCM_UNUSED) |
283a1a0e | 2440 | { |
70df8af6 | 2441 | return EOF; |
283a1a0e GH |
2442 | } |
2443 | ||
31703ab8 | 2444 | static void |
e81d98ec DH |
2445 | write_void_port (SCM port SCM_UNUSED, |
2446 | const void *data SCM_UNUSED, | |
2447 | size_t size SCM_UNUSED) | |
31703ab8 GH |
2448 | { |
2449 | } | |
2450 | ||
d617ee18 MV |
2451 | static SCM |
2452 | scm_i_void_port (long mode_bits) | |
0f2d19dd | 2453 | { |
2721f918 AW |
2454 | SCM ret; |
2455 | ||
2456 | ret = scm_c_make_port (scm_tc16_void_port, mode_bits, 0); | |
da220f27 | 2457 | |
2721f918 | 2458 | scm_port_non_buffer (SCM_PTAB_ENTRY (ret)); |
402788a9 | 2459 | |
2721f918 | 2460 | return ret; |
0f2d19dd JB |
2461 | } |
2462 | ||
d617ee18 MV |
2463 | SCM |
2464 | scm_void_port (char *mode_str) | |
2465 | { | |
2466 | return scm_i_void_port (scm_mode_bits (mode_str)); | |
2467 | } | |
2468 | ||
a1ec6916 | 2469 | SCM_DEFINE (scm_sys_make_void_port, "%make-void-port", 1, 0, 0, |
1bbd0b84 | 2470 | (SCM mode), |
70df8af6 | 2471 | "Create and return a new void port. A void port acts like\n" |
bb2c02f2 | 2472 | "@file{/dev/null}. The @var{mode} argument\n" |
70df8af6 | 2473 | "specifies the input/output modes for this port: see the\n" |
b380b885 | 2474 | "documentation for @code{open-file} in @ref{File Ports}.") |
1bbd0b84 | 2475 | #define FUNC_NAME s_scm_sys_make_void_port |
0f2d19dd | 2476 | { |
d617ee18 | 2477 | return scm_i_void_port (scm_i_mode_bits (mode)); |
0f2d19dd | 2478 | } |
1bbd0b84 | 2479 | #undef FUNC_NAME |
0f2d19dd | 2480 | |
0f2d19dd | 2481 | \f |
89545eba | 2482 | /* Initialization. */ |
1cc91f1b | 2483 | |
0f2d19dd JB |
2484 | void |
2485 | scm_init_ports () | |
0f2d19dd | 2486 | { |
840ae05d | 2487 | /* lseek() symbols. */ |
e11e83f3 MV |
2488 | scm_c_define ("SEEK_SET", scm_from_int (SEEK_SET)); |
2489 | scm_c_define ("SEEK_CUR", scm_from_int (SEEK_CUR)); | |
2490 | scm_c_define ("SEEK_END", scm_from_int (SEEK_END)); | |
840ae05d | 2491 | |
70df8af6 GH |
2492 | scm_tc16_void_port = scm_make_port_type ("void", fill_input_void_port, |
2493 | write_void_port); | |
9de87eea | 2494 | |
f39448c5 AW |
2495 | cur_inport_fluid = scm_make_fluid (); |
2496 | cur_outport_fluid = scm_make_fluid (); | |
2497 | cur_errport_fluid = scm_make_fluid (); | |
2498 | cur_loadport_fluid = scm_make_fluid (); | |
9de87eea | 2499 | |
2721f918 | 2500 | scm_i_port_weak_set = scm_c_make_weak_set (31); |
d6a6989e | 2501 | |
a0599745 | 2502 | #include "libguile/ports.x" |
889975e5 | 2503 | |
d6a6989e LC |
2504 | /* Use Latin-1 as the default port encoding. */ |
2505 | SCM_VARIABLE_SET (default_port_encoding_var, scm_make_fluid ()); | |
2506 | scm_fluid_set_x (SCM_VARIABLE_REF (default_port_encoding_var), SCM_BOOL_F); | |
889975e5 | 2507 | scm_port_encoding_init = 1; |
d6a6989e | 2508 | |
889975e5 MG |
2509 | SCM_VARIABLE_SET (scm_conversion_strategy, scm_make_fluid ()); |
2510 | scm_fluid_set_x (SCM_VARIABLE_REF (scm_conversion_strategy), | |
2511 | scm_from_int ((int) SCM_FAILED_CONVERSION_QUESTION_MARK)); | |
2512 | scm_conversion_strategy_init = 1; | |
2513 | ||
0f2d19dd | 2514 | } |
89e00824 ML |
2515 | |
2516 | /* | |
2517 | Local Variables: | |
2518 | c-file-style: "gnu" | |
2519 | End: | |
2520 | */ |