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7a754ca6 | 1 | /* Copyright (C) 1995,1996,1997,1998,1999, 2000 Free Software Foundation, Inc. |
0f2d19dd JB |
2 | * |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License as published by | |
5 | * the Free Software Foundation; either version 2, or (at your option) | |
6 | * any later version. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this software; see the file COPYING. If not, write to | |
82892bed JB |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
16 | * Boston, MA 02111-1307 USA | |
0f2d19dd JB |
17 | * |
18 | * As a special exception, the Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of GUILE. | |
20 | * | |
21 | * The exception is that, if you link the GUILE library with other files | |
22 | * to produce an executable, this does not by itself cause the | |
23 | * resulting executable to be covered by the GNU General Public License. | |
24 | * Your use of that executable is in no way restricted on account of | |
25 | * linking the GUILE library code into it. | |
26 | * | |
27 | * This exception does not however invalidate any other reasons why | |
28 | * the executable file might be covered by the GNU General Public License. | |
29 | * | |
30 | * This exception applies only to the code released by the | |
31 | * Free Software Foundation under the name GUILE. If you copy | |
32 | * code from other Free Software Foundation releases into a copy of | |
33 | * GUILE, as the General Public License permits, the exception does | |
34 | * not apply to the code that you add in this way. To avoid misleading | |
35 | * anyone as to the status of such modified files, you must delete | |
36 | * this exception notice from them. | |
37 | * | |
38 | * If you write modifications of your own for GUILE, it is your choice | |
39 | * whether to permit this exception to apply to your modifications. | |
82892bed | 40 | * If you do not wish that, delete this exception notice. */ |
1bbd0b84 GB |
41 | |
42 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, | |
43 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
44 | ||
0f2d19dd | 45 | \f |
d68fee48 JB |
46 | /* Headers. */ |
47 | ||
0f2d19dd | 48 | #include <stdio.h> |
a0599745 MD |
49 | #include "libguile/_scm.h" |
50 | #include "libguile/objects.h" | |
51 | #include "libguile/smob.h" | |
52 | #include "libguile/chars.h" | |
0f2d19dd | 53 | |
a0599745 MD |
54 | #include "libguile/keywords.h" |
55 | #include "libguile/root.h" | |
56 | #include "libguile/strings.h" | |
20e6290e | 57 | |
a0599745 MD |
58 | #include "libguile/validate.h" |
59 | #include "libguile/ports.h" | |
0f2d19dd | 60 | |
bd9e24b3 GH |
61 | #ifdef HAVE_STRING_H |
62 | #include <string.h> | |
63 | #endif | |
64 | ||
0f2d19dd | 65 | #ifdef HAVE_MALLOC_H |
95b88819 | 66 | #include <malloc.h> |
0f2d19dd JB |
67 | #endif |
68 | ||
69 | #ifdef HAVE_UNISTD_H | |
70 | #include <unistd.h> | |
71 | #endif | |
72 | ||
95b88819 GH |
73 | #ifdef HAVE_SYS_IOCTL_H |
74 | #include <sys/ioctl.h> | |
75 | #endif | |
d68fee48 | 76 | |
0f2d19dd | 77 | \f |
d68fee48 | 78 | /* The port kind table --- a dynamically resized array of port types. */ |
0f2d19dd JB |
79 | |
80 | ||
81 | /* scm_ptobs scm_numptob | |
82 | * implement a dynamicly resized array of ptob records. | |
83 | * Indexes into this table are used when generating type | |
84 | * tags for smobjects (if you know a tag you can get an index and conversely). | |
85 | */ | |
f12733c9 | 86 | scm_ptob_descriptor *scm_ptobs; |
a1c95c45 | 87 | int scm_numptob; |
0f2d19dd | 88 | |
ee149d03 | 89 | /* GC marker for a port with stream of SCM type. */ |
0f2d19dd | 90 | SCM |
a284e297 | 91 | scm_markstream (SCM ptr) |
0f2d19dd JB |
92 | { |
93 | int openp; | |
f1267706 | 94 | openp = SCM_UNPACK_CAR (ptr) & SCM_OPN; |
0f2d19dd | 95 | if (openp) |
74a16888 | 96 | return SCM_PACK (SCM_STREAM (ptr)); |
0f2d19dd JB |
97 | else |
98 | return SCM_BOOL_F; | |
99 | } | |
100 | ||
f12733c9 | 101 | /* |
f12733c9 | 102 | * We choose to use an interface similar to the smob interface with |
affc96b5 | 103 | * fill_input and write as standard fields, passed to the port |
f12733c9 MD |
104 | * type constructor, and optional fields set by setters. |
105 | */ | |
106 | ||
70df8af6 GH |
107 | static void |
108 | flush_port_default (SCM port) | |
109 | { | |
110 | } | |
111 | ||
112 | static void | |
113 | end_input_default (SCM port, int offset) | |
114 | { | |
115 | } | |
0f2d19dd | 116 | |
0f2d19dd | 117 | long |
f12733c9 | 118 | scm_make_port_type (char *name, |
affc96b5 | 119 | int (*fill_input) (SCM port), |
8aa011a1 | 120 | void (*write) (SCM port, const void *data, size_t size)) |
0f2d19dd JB |
121 | { |
122 | char *tmp; | |
123 | if (255 <= scm_numptob) | |
124 | goto ptoberr; | |
f12733c9 MD |
125 | SCM_DEFER_INTS; |
126 | SCM_SYSCALL (tmp = (char *) realloc ((char *) scm_ptobs, | |
127 | (1 + scm_numptob) | |
128 | * sizeof (scm_ptob_descriptor))); | |
0f2d19dd JB |
129 | if (tmp) |
130 | { | |
f12733c9 | 131 | scm_ptobs = (scm_ptob_descriptor *) tmp; |
affc96b5 | 132 | |
f12733c9 MD |
133 | scm_ptobs[scm_numptob].name = name; |
134 | scm_ptobs[scm_numptob].mark = 0; | |
135 | scm_ptobs[scm_numptob].free = scm_free0; | |
136 | scm_ptobs[scm_numptob].print = scm_port_print; | |
137 | scm_ptobs[scm_numptob].equalp = 0; | |
affc96b5 GH |
138 | scm_ptobs[scm_numptob].close = 0; |
139 | ||
140 | scm_ptobs[scm_numptob].write = write; | |
70df8af6 | 141 | scm_ptobs[scm_numptob].flush = flush_port_default; |
affc96b5 | 142 | |
70df8af6 | 143 | scm_ptobs[scm_numptob].end_input = end_input_default; |
affc96b5 GH |
144 | scm_ptobs[scm_numptob].fill_input = fill_input; |
145 | scm_ptobs[scm_numptob].input_waiting = 0; | |
146 | ||
f12733c9 | 147 | scm_ptobs[scm_numptob].seek = 0; |
affc96b5 GH |
148 | scm_ptobs[scm_numptob].truncate = 0; |
149 | ||
0f2d19dd JB |
150 | scm_numptob++; |
151 | } | |
f12733c9 | 152 | SCM_ALLOW_INTS; |
0f2d19dd | 153 | if (!tmp) |
f12733c9 MD |
154 | ptoberr:scm_wta (SCM_MAKINUM ((long) scm_numptob), |
155 | (char *) SCM_NALLOC, "scm_make_port_type"); | |
156 | /* Make a class object if Goops is present */ | |
157 | if (scm_port_class) | |
158 | scm_make_port_classes (scm_numptob - 1, SCM_PTOBNAME (scm_numptob - 1)); | |
0f2d19dd JB |
159 | return scm_tc7_port + (scm_numptob - 1) * 256; |
160 | } | |
161 | ||
f12733c9 | 162 | void |
6c747373 | 163 | scm_set_port_mark (long tc, SCM (*mark) (SCM)) |
f12733c9 MD |
164 | { |
165 | scm_ptobs[SCM_TC2PTOBNUM (tc)].mark = mark; | |
166 | } | |
167 | ||
168 | void | |
6c747373 | 169 | scm_set_port_free (long tc, scm_sizet (*free) (SCM)) |
f12733c9 MD |
170 | { |
171 | scm_ptobs[SCM_TC2PTOBNUM (tc)].free = free; | |
172 | } | |
173 | ||
174 | void | |
6c747373 | 175 | scm_set_port_print (long tc, int (*print) (SCM exp, SCM port, |
f12733c9 MD |
176 | scm_print_state *pstate)) |
177 | { | |
178 | scm_ptobs[SCM_TC2PTOBNUM (tc)].print = print; | |
179 | } | |
180 | ||
181 | void | |
6c747373 | 182 | scm_set_port_equalp (long tc, SCM (*equalp) (SCM, SCM)) |
f12733c9 MD |
183 | { |
184 | scm_ptobs[SCM_TC2PTOBNUM (tc)].equalp = equalp; | |
185 | } | |
186 | ||
31703ab8 | 187 | void |
affc96b5 | 188 | scm_set_port_flush (long tc, void (*flush) (SCM port)) |
31703ab8 | 189 | { |
affc96b5 | 190 | scm_ptobs[SCM_TC2PTOBNUM (tc)].flush = flush; |
31703ab8 GH |
191 | } |
192 | ||
f12733c9 | 193 | void |
affc96b5 | 194 | scm_set_port_end_input (long tc, void (*end_input) (SCM port, int offset)) |
f12733c9 | 195 | { |
affc96b5 | 196 | scm_ptobs[SCM_TC2PTOBNUM (tc)].end_input = end_input; |
f12733c9 MD |
197 | } |
198 | ||
199 | void | |
6c747373 | 200 | scm_set_port_close (long tc, int (*close) (SCM)) |
f12733c9 | 201 | { |
affc96b5 | 202 | scm_ptobs[SCM_TC2PTOBNUM (tc)].close = close; |
f12733c9 MD |
203 | } |
204 | ||
205 | void | |
6c747373 | 206 | scm_set_port_seek (long tc, off_t (*seek) (SCM port, |
f12733c9 MD |
207 | off_t OFFSET, |
208 | int WHENCE)) | |
209 | { | |
210 | scm_ptobs[SCM_TC2PTOBNUM (tc)].seek = seek; | |
211 | } | |
212 | ||
213 | void | |
6c747373 | 214 | scm_set_port_truncate (long tc, void (*truncate) (SCM port, off_t length)) |
f12733c9 | 215 | { |
affc96b5 | 216 | scm_ptobs[SCM_TC2PTOBNUM (tc)].truncate = truncate; |
f12733c9 MD |
217 | } |
218 | ||
219 | void | |
affc96b5 | 220 | scm_set_port_input_waiting (long tc, int (*input_waiting) (SCM)) |
f12733c9 | 221 | { |
affc96b5 | 222 | scm_ptobs[SCM_TC2PTOBNUM (tc)].input_waiting = input_waiting; |
f12733c9 MD |
223 | } |
224 | ||
0f2d19dd | 225 | \f |
0f2d19dd | 226 | |
3b3b36dd | 227 | SCM_DEFINE (scm_char_ready_p, "char-ready?", 0, 1, 0, |
1bbd0b84 | 228 | (SCM port), |
bfc46627 GB |
229 | "Returns @code{#t} if a character is ready on input @var{port} and\n" |
230 | "returns @code{#f} otherwise. If @code{char-ready?} returns @code{#t}\n" | |
231 | "then the next @code{read-char} operation on @var{port} is\n" | |
232 | "guaranteed not to hang. If @var{port} is a file port at end of\n" | |
233 | "file then @code{char-ready?} returns @code{#t}.\n" | |
234 | "@footnote{@code{char-ready?} exists to make it possible for a\n" | |
235 | "program to accept characters from interactive ports without getting\n" | |
236 | "stuck waiting for input. Any input editors associated with such ports\n" | |
237 | "must make sure that characters whose existence has been asserted by\n" | |
238 | "@code{char-ready?} cannot be rubbed out. If @code{char-ready?} were to\n" | |
239 | "return @code{#f} at end of file, a port at end of file would be\n" | |
240 | "indistinguishable from an interactive port that has no ready\n" | |
241 | "characters.}") | |
1bbd0b84 | 242 | #define FUNC_NAME s_scm_char_ready_p |
0f2d19dd | 243 | { |
ae4c4016 | 244 | scm_port *pt; |
6c951427 | 245 | |
0f2d19dd JB |
246 | if (SCM_UNBNDP (port)) |
247 | port = scm_cur_inp; | |
248 | else | |
3b3b36dd | 249 | SCM_VALIDATE_OPINPORT (1,port); |
d68fee48 | 250 | |
ae4c4016 JB |
251 | pt = SCM_PTAB_ENTRY (port); |
252 | ||
6c951427 GH |
253 | /* if the current read buffer is filled, or the |
254 | last pushed-back char has been read and the saved buffer is | |
255 | filled, result is true. */ | |
256 | if (pt->read_pos < pt->read_end | |
257 | || (pt->read_buf == pt->putback_buf | |
258 | && pt->saved_read_pos < pt->saved_read_end)) | |
0f2d19dd | 259 | return SCM_BOOL_T; |
ee149d03 JB |
260 | else |
261 | { | |
f12733c9 | 262 | scm_ptob_descriptor *ptob = &scm_ptobs[SCM_PTOBNUM (port)]; |
ee149d03 | 263 | |
affc96b5 | 264 | if (ptob->input_waiting) |
1bbd0b84 | 265 | return SCM_BOOL(ptob->input_waiting (port)); |
ee149d03 | 266 | else |
6c951427 | 267 | return SCM_BOOL_T; |
ee149d03 | 268 | } |
0f2d19dd | 269 | } |
1bbd0b84 | 270 | #undef FUNC_NAME |
0f2d19dd | 271 | |
6c951427 | 272 | /* Clear a port's read buffers, returning the contents. */ |
a1ec6916 | 273 | SCM_DEFINE (scm_drain_input, "drain-input", 1, 0, 0, |
1bbd0b84 | 274 | (SCM port), |
b380b885 MD |
275 | "Drains @var{PORT}'s read buffers (including any pushed-back characters)\n" |
276 | "and returns the contents as a single string.") | |
1bbd0b84 | 277 | #define FUNC_NAME s_scm_drain_input |
ee149d03 | 278 | { |
840ae05d JB |
279 | SCM result; |
280 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
6c951427 | 281 | int count; |
840ae05d | 282 | char *dst; |
ee149d03 | 283 | |
3b3b36dd | 284 | SCM_VALIDATE_OPINPORT (1,port); |
840ae05d | 285 | |
6c951427 GH |
286 | count = pt->read_end - pt->read_pos; |
287 | if (pt->read_buf == pt->putback_buf) | |
288 | count += pt->saved_read_end - pt->saved_read_pos; | |
840ae05d | 289 | |
6c951427 GH |
290 | result = scm_makstr (count, 0); |
291 | dst = SCM_CHARS (result); | |
840ae05d JB |
292 | |
293 | while (pt->read_pos < pt->read_end) | |
6c951427 GH |
294 | *dst++ = *(pt->read_pos++); |
295 | ||
296 | if (pt->read_buf == pt->putback_buf) | |
840ae05d | 297 | { |
6c951427 GH |
298 | while (pt->saved_read_pos < pt->saved_read_end) |
299 | *dst++ = *(pt->saved_read_pos++); | |
840ae05d | 300 | } |
6c951427 | 301 | |
840ae05d | 302 | return result; |
ee149d03 | 303 | } |
1bbd0b84 | 304 | #undef FUNC_NAME |
0f2d19dd JB |
305 | |
306 | \f | |
d68fee48 | 307 | /* Standard ports --- current input, output, error, and more(!). */ |
0f2d19dd | 308 | |
3b3b36dd | 309 | SCM_DEFINE (scm_current_input_port, "current-input-port", 0, 0, 0, |
1bbd0b84 | 310 | (), |
bfc46627 GB |
311 | "Returns the current input port. This is the default port used by many\n" |
312 | "input procedures. Initially, @code{current-input-port} returns the\n" | |
313 | "value of @code{???}.") | |
1bbd0b84 | 314 | #define FUNC_NAME s_scm_current_input_port |
0f2d19dd JB |
315 | { |
316 | return scm_cur_inp; | |
317 | } | |
1bbd0b84 | 318 | #undef FUNC_NAME |
0f2d19dd | 319 | |
3b3b36dd | 320 | SCM_DEFINE (scm_current_output_port, "current-output-port", 0, 0, 0, |
1bbd0b84 | 321 | (), |
bfc46627 GB |
322 | "Returns the current output port. This is the default port used by many\n" |
323 | "output procedures. Initially, @code{current-output-port} returns the\n" | |
324 | "value of @code{???}.") | |
1bbd0b84 | 325 | #define FUNC_NAME s_scm_current_output_port |
0f2d19dd JB |
326 | { |
327 | return scm_cur_outp; | |
328 | } | |
1bbd0b84 | 329 | #undef FUNC_NAME |
0f2d19dd | 330 | |
3b3b36dd | 331 | SCM_DEFINE (scm_current_error_port, "current-error-port", 0, 0, 0, |
1bbd0b84 | 332 | (), |
b380b885 MD |
333 | "Return the port to which errors and warnings should be sent (the\n" |
334 | "@dfn{standard error} in Unix and C terminology).") | |
1bbd0b84 | 335 | #define FUNC_NAME s_scm_current_error_port |
0f2d19dd JB |
336 | { |
337 | return scm_cur_errp; | |
338 | } | |
1bbd0b84 | 339 | #undef FUNC_NAME |
0f2d19dd | 340 | |
3b3b36dd | 341 | SCM_DEFINE (scm_current_load_port, "current-load-port", 0, 0, 0, |
1bbd0b84 | 342 | (), |
b450f070 GB |
343 | "Return the current-load-port.\n" |
344 | "The load port is used internally by `primitive-load'.") | |
1bbd0b84 | 345 | #define FUNC_NAME s_scm_current_load_port |
31614d8e MD |
346 | { |
347 | return scm_cur_loadp; | |
348 | } | |
1bbd0b84 | 349 | #undef FUNC_NAME |
31614d8e | 350 | |
3b3b36dd | 351 | SCM_DEFINE (scm_set_current_input_port, "set-current-input-port", 1, 0, 0, |
1bbd0b84 | 352 | (SCM port), |
b380b885 MD |
353 | "@deffnx primitive set-current-output-port port\n" |
354 | "@deffnx primitive set-current-error-port port\n" | |
355 | "Change the ports returned by @code{current-input-port},\n" | |
356 | "@code{current-output-port} and @code{current-error-port}, respectively,\n" | |
357 | "so that they use the supplied @var{port} for input or output.") | |
1bbd0b84 | 358 | #define FUNC_NAME s_scm_set_current_input_port |
0f2d19dd JB |
359 | { |
360 | SCM oinp = scm_cur_inp; | |
3b3b36dd | 361 | SCM_VALIDATE_OPINPORT (1,port); |
0f2d19dd JB |
362 | scm_cur_inp = port; |
363 | return oinp; | |
364 | } | |
1bbd0b84 | 365 | #undef FUNC_NAME |
0f2d19dd JB |
366 | |
367 | ||
3b3b36dd | 368 | SCM_DEFINE (scm_set_current_output_port, "set-current-output-port", 1, 0, 0, |
1bbd0b84 | 369 | (SCM port), |
b450f070 | 370 | "Set the current default output port to PORT.") |
1bbd0b84 | 371 | #define FUNC_NAME s_scm_set_current_output_port |
0f2d19dd JB |
372 | { |
373 | SCM ooutp = scm_cur_outp; | |
78446828 | 374 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd | 375 | SCM_VALIDATE_OPOUTPORT (1,port); |
0f2d19dd JB |
376 | scm_cur_outp = port; |
377 | return ooutp; | |
378 | } | |
1bbd0b84 | 379 | #undef FUNC_NAME |
0f2d19dd JB |
380 | |
381 | ||
3b3b36dd | 382 | SCM_DEFINE (scm_set_current_error_port, "set-current-error-port", 1, 0, 0, |
1bbd0b84 | 383 | (SCM port), |
b450f070 | 384 | "Set the current default error port to PORT.") |
1bbd0b84 | 385 | #define FUNC_NAME s_scm_set_current_error_port |
0f2d19dd JB |
386 | { |
387 | SCM oerrp = scm_cur_errp; | |
78446828 | 388 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd | 389 | SCM_VALIDATE_OPOUTPORT (1,port); |
0f2d19dd JB |
390 | scm_cur_errp = port; |
391 | return oerrp; | |
392 | } | |
1bbd0b84 | 393 | #undef FUNC_NAME |
0f2d19dd JB |
394 | |
395 | \f | |
840ae05d | 396 | /* The port table --- an array of pointers to ports. */ |
0f2d19dd | 397 | |
840ae05d | 398 | scm_port **scm_port_table; |
0f2d19dd JB |
399 | |
400 | int scm_port_table_size = 0; /* Number of ports in scm_port_table. */ | |
401 | int scm_port_table_room = 20; /* Size of the array. */ | |
402 | ||
ee149d03 | 403 | /* Add a port to the table. */ |
1cc91f1b | 404 | |
840ae05d | 405 | scm_port * |
a284e297 | 406 | scm_add_to_port_table (SCM port) |
0f2d19dd | 407 | { |
840ae05d JB |
408 | scm_port *entry; |
409 | ||
0f2d19dd JB |
410 | if (scm_port_table_size == scm_port_table_room) |
411 | { | |
ee149d03 | 412 | void *newt = realloc ((char *) scm_port_table, |
840ae05d | 413 | (scm_sizet) (sizeof (scm_port *) |
ee149d03 JB |
414 | * scm_port_table_room * 2)); |
415 | if (newt == NULL) | |
840ae05d JB |
416 | scm_memory_error ("scm_add_to_port_table"); |
417 | scm_port_table = (scm_port **) newt; | |
0f2d19dd JB |
418 | scm_port_table_room *= 2; |
419 | } | |
840ae05d JB |
420 | entry = (scm_port *) malloc (sizeof (scm_port)); |
421 | if (entry == NULL) | |
422 | scm_memory_error ("scm_add_to_port_table"); | |
423 | ||
424 | entry->port = port; | |
425 | entry->entry = scm_port_table_size; | |
426 | entry->revealed = 0; | |
427 | entry->stream = 0; | |
428 | entry->file_name = SCM_BOOL_F; | |
429 | entry->line_number = 0; | |
430 | entry->column_number = 0; | |
6c951427 GH |
431 | entry->putback_buf = 0; |
432 | entry->putback_buf_size = 0; | |
61e452ba | 433 | entry->rw_active = SCM_PORT_NEITHER; |
0de97b83 | 434 | entry->rw_random = 0; |
840ae05d JB |
435 | |
436 | scm_port_table[scm_port_table_size] = entry; | |
437 | scm_port_table_size++; | |
438 | ||
439 | return entry; | |
0f2d19dd JB |
440 | } |
441 | ||
6c951427 | 442 | /* Remove a port from the table and destroy it. */ |
1cc91f1b | 443 | |
0f2d19dd | 444 | void |
a284e297 | 445 | scm_remove_from_port_table (SCM port) |
0f2d19dd | 446 | { |
840ae05d | 447 | scm_port *p = SCM_PTAB_ENTRY (port); |
ee1e7e13 | 448 | int i = p->entry; |
6c951427 | 449 | |
ee1e7e13 MD |
450 | if (i >= scm_port_table_size) |
451 | scm_wta (port, "Port not in table", "scm_remove_from_port_table"); | |
6c951427 GH |
452 | if (p->putback_buf) |
453 | free (p->putback_buf); | |
840ae05d | 454 | free (p); |
ee1e7e13 MD |
455 | /* Since we have just freed slot i we can shrink the table by moving |
456 | the last entry to that slot... */ | |
457 | if (i < scm_port_table_size - 1) | |
0f2d19dd | 458 | { |
ee1e7e13 MD |
459 | scm_port_table[i] = scm_port_table[scm_port_table_size - 1]; |
460 | scm_port_table[i]->entry = i; | |
0f2d19dd | 461 | } |
0f2d19dd JB |
462 | SCM_SETPTAB_ENTRY (port, 0); |
463 | scm_port_table_size--; | |
464 | } | |
465 | ||
fea6b4ea | 466 | #ifdef GUILE_DEBUG |
b450f070 | 467 | /* Functions for debugging. */ |
1cc91f1b | 468 | |
3b3b36dd | 469 | SCM_DEFINE (scm_pt_size, "pt-size", 0, 0, 0, |
b450f070 GB |
470 | (), |
471 | "Returns the number of ports in the port table.\n" | |
472 | "`pt-size' is only included in GUILE_DEBUG builds.") | |
1bbd0b84 | 473 | #define FUNC_NAME s_scm_pt_size |
0f2d19dd JB |
474 | { |
475 | return SCM_MAKINUM (scm_port_table_size); | |
476 | } | |
1bbd0b84 | 477 | #undef FUNC_NAME |
0f2d19dd | 478 | |
3b3b36dd | 479 | SCM_DEFINE (scm_pt_member, "pt-member", 1, 0, 0, |
b450f070 GB |
480 | (SCM index), |
481 | "Returns the port at INDEX in the port table.\n" | |
482 | "`pt-member' is only included in GUILE_DEBUG builds.") | |
1bbd0b84 | 483 | #define FUNC_NAME s_scm_pt_member |
0f2d19dd JB |
484 | { |
485 | int i; | |
b450f070 | 486 | SCM_VALIDATE_INUM_COPY (1,index,i); |
0f2d19dd JB |
487 | if (i < 0 || i >= scm_port_table_size) |
488 | return SCM_BOOL_F; | |
489 | else | |
490 | return scm_port_table[i]->port; | |
491 | } | |
1bbd0b84 | 492 | #undef FUNC_NAME |
0f2d19dd JB |
493 | #endif |
494 | ||
70df8af6 GH |
495 | void |
496 | scm_port_non_buffer (scm_port *pt) | |
497 | { | |
498 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; | |
499 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
500 | pt->read_buf_size = pt->write_buf_size = 1; | |
501 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
502 | } | |
0f2d19dd | 503 | |
d68fee48 JB |
504 | \f |
505 | /* Revealed counts --- an oddity inherited from SCSH. */ | |
506 | ||
8b13c6b3 GH |
507 | /* Find a port in the table and return its revealed count. |
508 | Also used by the garbage collector. | |
0f2d19dd | 509 | */ |
1cc91f1b | 510 | |
0f2d19dd | 511 | int |
a284e297 | 512 | scm_revealed_count (SCM port) |
0f2d19dd JB |
513 | { |
514 | return SCM_REVEALED(port); | |
515 | } | |
516 | ||
517 | ||
518 | ||
519 | /* Return the revealed count for a port. */ | |
520 | ||
3b3b36dd | 521 | SCM_DEFINE (scm_port_revealed, "port-revealed", 1, 0, 0, |
1bbd0b84 | 522 | (SCM port), |
b380b885 | 523 | "Returns the revealed count for @var{port}.") |
1bbd0b84 | 524 | #define FUNC_NAME s_scm_port_revealed |
0f2d19dd | 525 | { |
78446828 | 526 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd | 527 | SCM_VALIDATE_PORT (1,port); |
8b13c6b3 | 528 | return SCM_MAKINUM (scm_revealed_count (port)); |
0f2d19dd | 529 | } |
1bbd0b84 | 530 | #undef FUNC_NAME |
0f2d19dd JB |
531 | |
532 | /* Set the revealed count for a port. */ | |
3b3b36dd | 533 | SCM_DEFINE (scm_set_port_revealed_x, "set-port-revealed!", 2, 0, 0, |
1bbd0b84 | 534 | (SCM port, SCM rcount), |
b450f070 | 535 | "Sets the revealed count for a port to a given value.\n" |
b380b885 | 536 | "The return value is unspecified.") |
1bbd0b84 | 537 | #define FUNC_NAME s_scm_set_port_revealed_x |
0f2d19dd | 538 | { |
78446828 | 539 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd GB |
540 | SCM_VALIDATE_PORT (1,port); |
541 | SCM_VALIDATE_INUM (2,rcount); | |
0f2d19dd | 542 | SCM_REVEALED (port) = SCM_INUM (rcount); |
8b13c6b3 | 543 | return SCM_UNSPECIFIED; |
0f2d19dd | 544 | } |
1bbd0b84 | 545 | #undef FUNC_NAME |
0f2d19dd | 546 | |
d68fee48 JB |
547 | |
548 | \f | |
549 | /* Retrieving a port's mode. */ | |
550 | ||
eadd48de GH |
551 | /* Return the flags that characterize a port based on the mode |
552 | * string used to open a file for that port. | |
553 | * | |
554 | * See PORT FLAGS in scm.h | |
555 | */ | |
556 | ||
557 | long | |
a284e297 | 558 | scm_mode_bits (char *modes) |
eadd48de GH |
559 | { |
560 | return (SCM_OPN | |
561 | | (strchr (modes, 'r') || strchr (modes, '+') ? SCM_RDNG : 0) | |
562 | | ( strchr (modes, 'w') | |
563 | || strchr (modes, 'a') | |
564 | || strchr (modes, '+') ? SCM_WRTNG : 0) | |
ee149d03 JB |
565 | | (strchr (modes, '0') ? SCM_BUF0 : 0) |
566 | | (strchr (modes, 'l') ? SCM_BUFLINE : 0)); | |
eadd48de GH |
567 | } |
568 | ||
569 | ||
570 | /* Return the mode flags from an open port. | |
571 | * Some modes such as "append" are only used when opening | |
572 | * a file and are not returned here. */ | |
573 | ||
3b3b36dd | 574 | SCM_DEFINE (scm_port_mode, "port-mode", 1, 0, 0, |
1bbd0b84 | 575 | (SCM port), |
b380b885 MD |
576 | "Returns the port modes associated with the open port @var{port}. These\n" |
577 | "will not necessarily be identical to the modes used when the port was\n" | |
578 | "opened, since modes such as \"append\" which are used only during\n" | |
579 | "port creation are not retained.") | |
1bbd0b84 | 580 | #define FUNC_NAME s_scm_port_mode |
eadd48de GH |
581 | { |
582 | char modes[3]; | |
583 | modes[0] = '\0'; | |
78446828 MV |
584 | |
585 | port = SCM_COERCE_OUTPORT (port); | |
3b3b36dd | 586 | SCM_VALIDATE_OPPORT (1,port); |
f1267706 MD |
587 | if (SCM_UNPACK_CAR (port) & SCM_RDNG) { |
588 | if (SCM_UNPACK_CAR (port) & SCM_WRTNG) | |
eadd48de GH |
589 | strcpy (modes, "r+"); |
590 | else | |
591 | strcpy (modes, "r"); | |
592 | } | |
f1267706 | 593 | else if (SCM_UNPACK_CAR (port) & SCM_WRTNG) |
eadd48de | 594 | strcpy (modes, "w"); |
f1267706 | 595 | if (SCM_UNPACK_CAR (port) & SCM_BUF0) |
eadd48de GH |
596 | strcat (modes, "0"); |
597 | return scm_makfromstr (modes, strlen (modes), 0); | |
598 | } | |
1bbd0b84 | 599 | #undef FUNC_NAME |
eadd48de GH |
600 | |
601 | ||
d68fee48 JB |
602 | \f |
603 | /* Closing ports. */ | |
604 | ||
0f2d19dd JB |
605 | /* scm_close_port |
606 | * Call the close operation on a port object. | |
eadd48de | 607 | * see also scm_close. |
0f2d19dd | 608 | */ |
3b3b36dd | 609 | SCM_DEFINE (scm_close_port, "close-port", 1, 0, 0, |
1bbd0b84 | 610 | (SCM port), |
b380b885 MD |
611 | "Close the specified port object. Returns @code{#t} if it successfully\n" |
612 | "closes a port or @code{#f} if it was already\n" | |
613 | "closed. An exception may be raised if an error occurs, for example\n" | |
614 | "when flushing buffered output.\n" | |
615 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" | |
616 | "which can close file descriptors.") | |
1bbd0b84 | 617 | #define FUNC_NAME s_scm_close_port |
0f2d19dd JB |
618 | { |
619 | scm_sizet i; | |
eadd48de GH |
620 | int rv; |
621 | ||
78446828 MV |
622 | port = SCM_COERCE_OUTPORT (port); |
623 | ||
7a754ca6 | 624 | SCM_VALIDATE_PORT (1, port); |
0f2d19dd | 625 | if (SCM_CLOSEDP (port)) |
eadd48de | 626 | return SCM_BOOL_F; |
0f2d19dd | 627 | i = SCM_PTOBNUM (port); |
affc96b5 GH |
628 | if (scm_ptobs[i].close) |
629 | rv = (scm_ptobs[i].close) (port); | |
eadd48de GH |
630 | else |
631 | rv = 0; | |
0f2d19dd | 632 | scm_remove_from_port_table (port); |
898a256f | 633 | SCM_SETAND_CAR (port, ~SCM_OPN); |
7a754ca6 MD |
634 | return SCM_NEGATE_BOOL (rv < 0); |
635 | } | |
636 | #undef FUNC_NAME | |
637 | ||
638 | SCM_DEFINE (scm_close_input_port, "close-input-port", 1, 0, 0, | |
639 | (SCM port), | |
640 | "Close the specified input port object. The routine has no effect if\n" | |
641 | "the file has already been closed. An exception may be raised if an\n" | |
642 | "error occurs. The value returned is unspecified.\n\n" | |
643 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" | |
644 | "which can close file descriptors.") | |
645 | #define FUNC_NAME s_scm_close_input_port | |
646 | { | |
647 | SCM_VALIDATE_INPUT_PORT (1, port); | |
648 | scm_close_port (port); | |
649 | return SCM_UNSPECIFIED; | |
650 | } | |
651 | #undef FUNC_NAME | |
652 | ||
653 | SCM_DEFINE (scm_close_output_port, "close-output-port", 1, 0, 0, | |
654 | (SCM port), | |
655 | "Close the specified output port object. The routine has no effect if\n" | |
656 | "the file has already been closed. An exception may be raised if an\n" | |
657 | "error occurs. The value returned is unspecified.\n\n" | |
658 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" | |
659 | "which can close file descriptors.") | |
660 | #define FUNC_NAME s_scm_close_output_port | |
661 | { | |
662 | port = SCM_COERCE_OUTPORT (port); | |
663 | SCM_VALIDATE_OUTPUT_PORT (1, port); | |
664 | scm_close_port (port); | |
665 | return SCM_UNSPECIFIED; | |
0f2d19dd | 666 | } |
1bbd0b84 | 667 | #undef FUNC_NAME |
0f2d19dd | 668 | |
3b3b36dd | 669 | SCM_DEFINE (scm_close_all_ports_except, "close-all-ports-except", 0, 0, 1, |
1bbd0b84 | 670 | (SCM ports), |
b380b885 MD |
671 | "Close all open file ports used by the interpreter\n" |
672 | "except for those supplied as arguments. This procedure\n" | |
673 | "is intended to be used before an exec call to close file descriptors\n" | |
b380b885 | 674 | "which are not needed in the new process.") |
1bbd0b84 | 675 | #define FUNC_NAME s_scm_close_all_ports_except |
0f2d19dd JB |
676 | { |
677 | int i = 0; | |
3b3b36dd | 678 | SCM_VALIDATE_CONS (1,ports); |
0f2d19dd JB |
679 | while (i < scm_port_table_size) |
680 | { | |
681 | SCM thisport = scm_port_table[i]->port; | |
682 | int found = 0; | |
683 | SCM ports_ptr = ports; | |
684 | ||
685 | while (SCM_NNULLP (ports_ptr)) | |
686 | { | |
78446828 | 687 | SCM port = SCM_COERCE_OUTPORT (SCM_CAR (ports_ptr)); |
0f2d19dd | 688 | if (i == 0) |
3b3b36dd | 689 | SCM_VALIDATE_OPPORT (SCM_ARG1,port); |
54778cd3 | 690 | if (SCM_EQ_P (port, thisport)) |
0f2d19dd JB |
691 | found = 1; |
692 | ports_ptr = SCM_CDR (ports_ptr); | |
693 | } | |
694 | if (found) | |
695 | i++; | |
696 | else | |
697 | /* i is not to be incremented here. */ | |
698 | scm_close_port (thisport); | |
699 | } | |
0f2d19dd JB |
700 | return SCM_UNSPECIFIED; |
701 | } | |
1bbd0b84 | 702 | #undef FUNC_NAME |
0f2d19dd | 703 | |
d68fee48 JB |
704 | |
705 | \f | |
706 | /* Utter miscellany. Gosh, we should clean this up some time. */ | |
707 | ||
3b3b36dd | 708 | SCM_DEFINE (scm_input_port_p, "input-port?", 1, 0, 0, |
1bbd0b84 | 709 | (SCM x), |
bfc46627 GB |
710 | "Returns @code{#t} if @var{x} is an input port, otherwise returns\n" |
711 | "@code{#f}. Any object satisfying this predicate also satisfies\n" | |
712 | "@code{port?}.") | |
1bbd0b84 | 713 | #define FUNC_NAME s_scm_input_port_p |
0f2d19dd JB |
714 | { |
715 | if (SCM_IMP (x)) | |
4a94d8ca | 716 | return SCM_BOOL_F; |
1bbd0b84 | 717 | return SCM_BOOL(SCM_INPORTP (x)); |
0f2d19dd | 718 | } |
1bbd0b84 | 719 | #undef FUNC_NAME |
0f2d19dd | 720 | |
3b3b36dd | 721 | SCM_DEFINE (scm_output_port_p, "output-port?", 1, 0, 0, |
1bbd0b84 | 722 | (SCM x), |
bfc46627 GB |
723 | "Returns @code{#t} if @var{x} is an output port, otherwise returns\n" |
724 | "@code{#f}. Any object satisfying this predicate also satisfies\n" | |
725 | "@code{port?}.") | |
1bbd0b84 | 726 | #define FUNC_NAME s_scm_output_port_p |
0f2d19dd JB |
727 | { |
728 | if (SCM_IMP (x)) | |
4a94d8ca MD |
729 | return SCM_BOOL_F; |
730 | if (SCM_PORT_WITH_PS_P (x)) | |
731 | x = SCM_PORT_WITH_PS_PORT (x); | |
1bbd0b84 | 732 | return SCM_BOOL(SCM_OUTPORTP (x)); |
0f2d19dd | 733 | } |
1bbd0b84 | 734 | #undef FUNC_NAME |
0f2d19dd | 735 | |
3b3b36dd | 736 | SCM_DEFINE (scm_port_closed_p, "port-closed?", 1, 0, 0, |
1bbd0b84 | 737 | (SCM port), |
b380b885 | 738 | "Returns @code{#t} if @var{port} is closed or @code{#f} if it is open.") |
1bbd0b84 | 739 | #define FUNC_NAME s_scm_port_closed_p |
60d0643d | 740 | { |
c1bfcf60 | 741 | SCM_VALIDATE_PORT (1,port); |
1bbd0b84 | 742 | return SCM_NEGATE_BOOL(SCM_OPPORTP (port)); |
60d0643d | 743 | } |
1bbd0b84 | 744 | #undef FUNC_NAME |
0f2d19dd | 745 | |
3b3b36dd | 746 | SCM_DEFINE (scm_eof_object_p, "eof-object?", 1, 0, 0, |
1bbd0b84 | 747 | (SCM x), |
bfc46627 GB |
748 | "Returns @code{#t} if @var{x} is an end-of-file object; otherwise\n" |
749 | "returns @code{#f}.") | |
1bbd0b84 | 750 | #define FUNC_NAME s_scm_eof_object_p |
0f2d19dd | 751 | { |
1bbd0b84 | 752 | return SCM_BOOL(SCM_EOF_OBJECT_P (x)); |
0f2d19dd | 753 | } |
1bbd0b84 | 754 | #undef FUNC_NAME |
0f2d19dd | 755 | |
3b3b36dd | 756 | SCM_DEFINE (scm_force_output, "force-output", 0, 1, 0, |
1bbd0b84 | 757 | (SCM port), |
b380b885 MD |
758 | "Flush the specified output port, or the current output port if @var{port}\n" |
759 | "is omitted. The current output buffer contents are passed to the \n" | |
760 | "underlying port implementation (e.g., in the case of fports, the\n" | |
761 | "data will be written to the file and the output buffer will be cleared.)\n" | |
762 | "It has no effect on an unbuffered port.\n\n" | |
763 | "The return value is unspecified.") | |
1bbd0b84 | 764 | #define FUNC_NAME s_scm_force_output |
0f2d19dd JB |
765 | { |
766 | if (SCM_UNBNDP (port)) | |
3e877d15 | 767 | port = scm_cur_outp; |
0f2d19dd | 768 | else |
78446828 MV |
769 | { |
770 | port = SCM_COERCE_OUTPORT (port); | |
3b3b36dd | 771 | SCM_VALIDATE_OPOUTPORT (1,port); |
78446828 | 772 | } |
affc96b5 | 773 | scm_flush (port); |
ee149d03 | 774 | return SCM_UNSPECIFIED; |
0f2d19dd | 775 | } |
1bbd0b84 | 776 | #undef FUNC_NAME |
0f2d19dd | 777 | |
a1ec6916 | 778 | SCM_DEFINE (scm_flush_all_ports, "flush-all-ports", 0, 0, 0, |
1bbd0b84 | 779 | (), |
b380b885 MD |
780 | "Equivalent to calling @code{force-output} on\n" |
781 | "all open output ports. The return value is unspecified.") | |
1bbd0b84 | 782 | #define FUNC_NAME s_scm_flush_all_ports |
89ea5b7c GH |
783 | { |
784 | int i; | |
785 | ||
786 | for (i = 0; i < scm_port_table_size; i++) | |
787 | { | |
ee149d03 | 788 | if (SCM_OPOUTPORTP (scm_port_table[i]->port)) |
affc96b5 | 789 | scm_flush (scm_port_table[i]->port); |
89ea5b7c GH |
790 | } |
791 | return SCM_UNSPECIFIED; | |
792 | } | |
1bbd0b84 | 793 | #undef FUNC_NAME |
0f2d19dd | 794 | |
3b3b36dd | 795 | SCM_DEFINE (scm_read_char, "read-char", 0, 1, 0, |
1bbd0b84 | 796 | (SCM port), |
bfc46627 GB |
797 | "Returns the next character available from @var{port}, updating\n" |
798 | "@var{port} to point to the following character. If no more\n" | |
799 | "characters are available, an end-of-file object is returned.") | |
1bbd0b84 | 800 | #define FUNC_NAME s_scm_read_char |
0f2d19dd JB |
801 | { |
802 | int c; | |
803 | if (SCM_UNBNDP (port)) | |
334341aa | 804 | port = scm_cur_inp; |
3b3b36dd | 805 | SCM_VALIDATE_OPINPORT (1,port); |
b7f3516f | 806 | c = scm_getc (port); |
0f2d19dd JB |
807 | if (EOF == c) |
808 | return SCM_EOF_VAL; | |
7866a09b | 809 | return SCM_MAKE_CHAR (c); |
0f2d19dd | 810 | } |
1bbd0b84 | 811 | #undef FUNC_NAME |
0f2d19dd | 812 | |
5c070ca7 | 813 | /* this should only be called when the read buffer is empty. it |
affc96b5 | 814 | tries to refill the read buffer. it returns the first char from |
5c070ca7 | 815 | the port, which is either EOF or *(pt->read_pos). */ |
6c951427 | 816 | int |
affc96b5 | 817 | scm_fill_input (SCM port) |
6c951427 | 818 | { |
283a1a0e GH |
819 | scm_port *pt = SCM_PTAB_ENTRY (port); |
820 | ||
6c951427 GH |
821 | if (pt->read_buf == pt->putback_buf) |
822 | { | |
823 | /* finished reading put-back chars. */ | |
824 | pt->read_buf = pt->saved_read_buf; | |
825 | pt->read_pos = pt->saved_read_pos; | |
826 | pt->read_end = pt->saved_read_end; | |
827 | pt->read_buf_size = pt->saved_read_buf_size; | |
828 | if (pt->read_pos < pt->read_end) | |
5c070ca7 | 829 | return *(pt->read_pos); |
6c951427 | 830 | } |
affc96b5 | 831 | return scm_ptobs[SCM_PTOBNUM (port)].fill_input (port); |
6c951427 GH |
832 | } |
833 | ||
ee149d03 | 834 | int |
a284e297 | 835 | scm_getc (SCM port) |
0f2d19dd JB |
836 | { |
837 | int c; | |
840ae05d | 838 | scm_port *pt = SCM_PTAB_ENTRY (port); |
ee149d03 | 839 | |
840ae05d JB |
840 | if (pt->rw_active == SCM_PORT_WRITE) |
841 | { | |
affc96b5 GH |
842 | /* may be marginally faster than calling scm_flush. */ |
843 | scm_ptobs[SCM_PTOBNUM (port)].flush (port); | |
840ae05d | 844 | } |
6c951427 | 845 | |
5c070ca7 GH |
846 | if (pt->rw_random) |
847 | pt->rw_active = SCM_PORT_READ; | |
848 | ||
849 | if (pt->read_pos >= pt->read_end) | |
ee149d03 | 850 | { |
affc96b5 | 851 | if (scm_fill_input (port) == EOF) |
5c070ca7 | 852 | return EOF; |
ee149d03 JB |
853 | } |
854 | ||
5c070ca7 | 855 | c = *(pt->read_pos++); |
840ae05d | 856 | |
ee149d03 JB |
857 | if (c == '\n') |
858 | { | |
859 | SCM_INCLINE (port); | |
860 | } | |
861 | else if (c == '\t') | |
862 | { | |
863 | SCM_TABCOL (port); | |
864 | } | |
865 | else | |
866 | { | |
867 | SCM_INCCOL (port); | |
868 | } | |
869 | ||
870 | return c; | |
0f2d19dd JB |
871 | } |
872 | ||
ee149d03 | 873 | void |
a284e297 | 874 | scm_putc (char c, SCM port) |
ee149d03 | 875 | { |
265e6a4d | 876 | scm_lfwrite (&c, 1, port); |
ee149d03 | 877 | } |
3cb988bd | 878 | |
ee149d03 | 879 | void |
70d63753 | 880 | scm_puts (const char *s, SCM port) |
3cb988bd | 881 | { |
265e6a4d | 882 | scm_lfwrite (s, strlen (s), port); |
ee149d03 | 883 | } |
3cb988bd | 884 | |
ee149d03 | 885 | void |
70d63753 | 886 | scm_lfwrite (const char *ptr, scm_sizet size, SCM port) |
ee149d03 | 887 | { |
840ae05d | 888 | scm_port *pt = SCM_PTAB_ENTRY (port); |
f12733c9 | 889 | scm_ptob_descriptor *ptob = &scm_ptobs[SCM_PTOBNUM (port)]; |
3e2043c4 | 890 | |
840ae05d | 891 | if (pt->rw_active == SCM_PORT_READ) |
affc96b5 | 892 | scm_end_input (port); |
283a1a0e | 893 | |
31703ab8 | 894 | ptob->write (port, ptr, size); |
840ae05d JB |
895 | |
896 | if (pt->rw_random) | |
897 | pt->rw_active = SCM_PORT_WRITE; | |
ee149d03 | 898 | } |
3cb988bd | 899 | |
3cb988bd | 900 | |
ee149d03 | 901 | void |
a284e297 | 902 | scm_flush (SCM port) |
ee149d03 JB |
903 | { |
904 | scm_sizet i = SCM_PTOBNUM (port); | |
affc96b5 | 905 | (scm_ptobs[i].flush) (port); |
ee149d03 JB |
906 | } |
907 | ||
283a1a0e | 908 | void |
a284e297 | 909 | scm_end_input (SCM port) |
283a1a0e GH |
910 | { |
911 | int offset; | |
912 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
913 | ||
914 | if (pt->read_buf == pt->putback_buf) | |
915 | { | |
916 | offset = pt->read_end - pt->read_pos; | |
917 | pt->read_buf = pt->saved_read_buf; | |
918 | pt->read_pos = pt->saved_read_pos; | |
919 | pt->read_end = pt->saved_read_end; | |
920 | pt->read_buf_size = pt->saved_read_buf_size; | |
921 | } | |
922 | else | |
923 | offset = 0; | |
924 | ||
affc96b5 | 925 | scm_ptobs[SCM_PTOBNUM (port)].end_input (port, offset); |
283a1a0e GH |
926 | } |
927 | ||
ee149d03 JB |
928 | \f |
929 | ||
930 | ||
931 | void | |
a284e297 | 932 | scm_ungetc (int c, SCM port) |
ee149d03 | 933 | { |
840ae05d JB |
934 | scm_port *pt = SCM_PTAB_ENTRY (port); |
935 | ||
6c951427 GH |
936 | if (pt->read_buf == pt->putback_buf) |
937 | /* already using the put-back buffer. */ | |
938 | { | |
939 | /* enlarge putback_buf if necessary. */ | |
940 | if (pt->read_end == pt->read_buf + pt->read_buf_size | |
941 | && pt->read_buf == pt->read_pos) | |
942 | { | |
943 | int new_size = pt->read_buf_size * 2; | |
944 | unsigned char *tmp = | |
945 | (unsigned char *) realloc (pt->putback_buf, new_size); | |
946 | ||
947 | if (tmp == NULL) | |
948 | scm_memory_error ("scm_ungetc"); | |
949 | pt->read_pos = pt->read_buf = pt->putback_buf = tmp; | |
950 | pt->read_end = pt->read_buf + pt->read_buf_size; | |
951 | pt->read_buf_size = pt->putback_buf_size = new_size; | |
952 | } | |
953 | ||
954 | /* shift any existing bytes to buffer + 1. */ | |
955 | if (pt->read_pos == pt->read_end) | |
956 | pt->read_end = pt->read_buf + 1; | |
957 | else if (pt->read_pos != pt->read_buf + 1) | |
958 | { | |
959 | int count = pt->read_end - pt->read_pos; | |
960 | ||
961 | memmove (pt->read_buf + 1, pt->read_pos, count); | |
962 | pt->read_end = pt->read_buf + 1 + count; | |
963 | } | |
964 | ||
965 | pt->read_pos = pt->read_buf; | |
966 | } | |
967 | else | |
968 | /* switch to the put-back buffer. */ | |
969 | { | |
970 | if (pt->putback_buf == NULL) | |
971 | { | |
6e2e75db | 972 | pt->putback_buf = (char *) malloc (SCM_INITIAL_PUTBACK_BUF_SIZE); |
6c951427 GH |
973 | if (pt->putback_buf == NULL) |
974 | scm_memory_error ("scm_ungetc"); | |
975 | pt->putback_buf_size = SCM_INITIAL_PUTBACK_BUF_SIZE; | |
976 | } | |
977 | ||
978 | pt->saved_read_buf = pt->read_buf; | |
979 | pt->saved_read_pos = pt->read_pos; | |
980 | pt->saved_read_end = pt->read_end; | |
981 | pt->saved_read_buf_size = pt->read_buf_size; | |
982 | ||
983 | pt->read_pos = pt->read_buf = pt->putback_buf; | |
984 | pt->read_end = pt->read_buf + 1; | |
985 | pt->read_buf_size = pt->putback_buf_size; | |
986 | } | |
987 | ||
988 | *pt->read_buf = c; | |
ee149d03 | 989 | |
840ae05d JB |
990 | if (pt->rw_random) |
991 | pt->rw_active = SCM_PORT_READ; | |
992 | ||
ee149d03 JB |
993 | if (c == '\n') |
994 | { | |
995 | /* What should col be in this case? | |
996 | * We'll leave it at -1. | |
997 | */ | |
998 | SCM_LINUM (port) -= 1; | |
999 | } | |
1000 | else | |
1001 | SCM_COL(port) -= 1; | |
1002 | } | |
1003 | ||
1004 | ||
1005 | void | |
70d63753 | 1006 | scm_ungets (const char *s, int n, SCM port) |
ee149d03 JB |
1007 | { |
1008 | /* This is simple minded and inefficient, but unreading strings is | |
1009 | * probably not a common operation, and remember that line and | |
1010 | * column numbers have to be handled... | |
1011 | * | |
1012 | * Please feel free to write an optimized version! | |
1013 | */ | |
1014 | while (n--) | |
1015 | scm_ungetc (s[n], port); | |
1016 | } | |
1017 | ||
1018 | ||
3b3b36dd | 1019 | SCM_DEFINE (scm_peek_char, "peek-char", 0, 1, 0, |
1bbd0b84 | 1020 | (SCM port), |
bfc46627 GB |
1021 | "Returns the next character available from @var{port},\n" |
1022 | "@emph{without} updating @var{port} to point to the following\n" | |
1023 | "character. If no more characters are available, an end-of-file object\n" | |
1024 | "is returned.@footnote{The value returned by a call to @code{peek-char}\n" | |
1025 | "is the same as the value that would have been returned by a call to\n" | |
1026 | "@code{read-char} on the same port. The only difference is that the very\n" | |
1027 | "next call to @code{read-char} or @code{peek-char} on that\n" | |
1028 | "@var{port} will return the value returned by the preceding call to\n" | |
1029 | "@code{peek-char}. In particular, a call to @code{peek-char} on an\n" | |
1030 | "interactive port will hang waiting for input whenever a call to\n" | |
1031 | "@code{read-char} would have hung.}") | |
1bbd0b84 | 1032 | #define FUNC_NAME s_scm_peek_char |
ee149d03 JB |
1033 | { |
1034 | int c; | |
1035 | if (SCM_UNBNDP (port)) | |
1036 | port = scm_cur_inp; | |
1037 | else | |
3b3b36dd | 1038 | SCM_VALIDATE_OPINPORT (1,port); |
ee149d03 JB |
1039 | c = scm_getc (port); |
1040 | if (EOF == c) | |
1041 | return SCM_EOF_VAL; | |
1042 | scm_ungetc (c, port); | |
7866a09b | 1043 | return SCM_MAKE_CHAR (c); |
3cb988bd | 1044 | } |
1bbd0b84 | 1045 | #undef FUNC_NAME |
3cb988bd | 1046 | |
a1ec6916 | 1047 | SCM_DEFINE (scm_unread_char, "unread-char", 2, 0, 0, |
1bbd0b84 | 1048 | (SCM cobj, SCM port), |
b380b885 MD |
1049 | "Place @var{char} in @var{port} so that it will be read by the\n" |
1050 | "next read operation. If called multiple times, the unread characters\n" | |
1051 | "will be read again in last-in first-out order. If @var{port} is\n" | |
1052 | "not supplied, the current input port is used.") | |
1bbd0b84 | 1053 | #define FUNC_NAME s_scm_unread_char |
0f2d19dd JB |
1054 | { |
1055 | int c; | |
1056 | ||
7866a09b | 1057 | SCM_VALIDATE_CHAR (1,cobj); |
0f2d19dd JB |
1058 | if (SCM_UNBNDP (port)) |
1059 | port = scm_cur_inp; | |
1060 | else | |
3b3b36dd | 1061 | SCM_VALIDATE_OPINPORT (2,port); |
0f2d19dd | 1062 | |
7866a09b | 1063 | c = SCM_CHAR (cobj); |
0f2d19dd | 1064 | |
b7f3516f | 1065 | scm_ungetc (c, port); |
0f2d19dd JB |
1066 | return cobj; |
1067 | } | |
1bbd0b84 | 1068 | #undef FUNC_NAME |
0f2d19dd | 1069 | |
a1ec6916 | 1070 | SCM_DEFINE (scm_unread_string, "unread-string", 2, 0, 0, |
1bbd0b84 | 1071 | (SCM str, SCM port), |
b380b885 MD |
1072 | "Place the string @var{str} in @var{port} so that its characters will be\n" |
1073 | "read in subsequent read operations. If called multiple times, the\n" | |
1074 | "unread characters will be read again in last-in first-out order. If\n" | |
1075 | "@var{port} is not supplied, the current-input-port is used.") | |
1bbd0b84 | 1076 | #define FUNC_NAME s_scm_unread_string |
ee1e7e13 | 1077 | { |
3b3b36dd | 1078 | SCM_VALIDATE_STRING (1,str); |
ee1e7e13 MD |
1079 | if (SCM_UNBNDP (port)) |
1080 | port = scm_cur_inp; | |
1081 | else | |
3b3b36dd | 1082 | SCM_VALIDATE_OPINPORT (2,port); |
ee1e7e13 | 1083 | |
d1c90db5 | 1084 | scm_ungets (SCM_ROUCHARS (str), SCM_LENGTH (str), port); |
ee1e7e13 MD |
1085 | |
1086 | return str; | |
1087 | } | |
1bbd0b84 | 1088 | #undef FUNC_NAME |
ee1e7e13 | 1089 | |
a1ec6916 | 1090 | SCM_DEFINE (scm_seek, "seek", 3, 0, 0, |
1bbd0b84 | 1091 | (SCM object, SCM offset, SCM whence), |
b380b885 MD |
1092 | "Sets the current position of @var{fd/port} to the integer @var{offset},\n" |
1093 | "which is interpreted according to the value of @var{whence}.\n\n" | |
1094 | "One of the following variables should be supplied\n" | |
1095 | "for @var{whence}:\n" | |
1096 | "@defvar SEEK_SET\n" | |
1097 | "Seek from the beginning of the file.\n" | |
1098 | "@end defvar\n" | |
1099 | "@defvar SEEK_CUR\n" | |
1100 | "Seek from the current position.\n" | |
1101 | "@end defvar\n" | |
1102 | "@defvar SEEK_END\n" | |
1103 | "Seek from the end of the file.\n" | |
1104 | "@end defvar\n\n" | |
1105 | "If @var{fd/port} is a file descriptor, the underlying system call is\n" | |
1106 | "@code{lseek}. @var{port} may be a string port.\n\n" | |
1107 | "The value returned is the new position in the file. This means that\n" | |
1108 | "the current position of a port can be obtained using:\n" | |
1109 | "@smalllisp\n" | |
1110 | "(seek port 0 SEEK_CUR)\n" | |
1111 | "@end smalllisp") | |
1bbd0b84 | 1112 | #define FUNC_NAME s_scm_seek |
840ae05d JB |
1113 | { |
1114 | off_t off; | |
1115 | off_t rv; | |
1116 | int how; | |
1117 | ||
1118 | object = SCM_COERCE_OUTPORT (object); | |
1119 | ||
1bbd0b84 | 1120 | off = SCM_NUM2LONG (2,offset); |
3b3b36dd | 1121 | SCM_VALIDATE_INUM_COPY (3,whence,how); |
840ae05d | 1122 | if (how != SEEK_SET && how != SEEK_CUR && how != SEEK_END) |
1bbd0b84 | 1123 | SCM_OUT_OF_RANGE (3, whence); |
0c95b57d | 1124 | if (SCM_OPPORTP (object)) |
840ae05d | 1125 | { |
f12733c9 | 1126 | scm_ptob_descriptor *ptob = scm_ptobs + SCM_PTOBNUM (object); |
840ae05d JB |
1127 | |
1128 | if (!ptob->seek) | |
1bbd0b84 GB |
1129 | SCM_MISC_ERROR ("port is not seekable", |
1130 | scm_cons (object, SCM_EOL)); | |
840ae05d | 1131 | else |
7dcb364d | 1132 | rv = ptob->seek (object, off, how); |
840ae05d JB |
1133 | } |
1134 | else /* file descriptor?. */ | |
1135 | { | |
3b3b36dd | 1136 | SCM_VALIDATE_INUM (1,object); |
840ae05d JB |
1137 | rv = lseek (SCM_INUM (object), off, how); |
1138 | if (rv == -1) | |
1bbd0b84 | 1139 | SCM_SYSERROR; |
840ae05d JB |
1140 | } |
1141 | return scm_long2num (rv); | |
1142 | } | |
1bbd0b84 | 1143 | #undef FUNC_NAME |
840ae05d | 1144 | |
a1ec6916 | 1145 | SCM_DEFINE (scm_truncate_file, "truncate-file", 1, 1, 0, |
1bbd0b84 | 1146 | (SCM object, SCM length), |
b380b885 MD |
1147 | "Truncates the object referred to by @var{obj} to at most @var{size} bytes.\n" |
1148 | "@var{obj} can be a string containing a file name or an integer file\n" | |
1149 | "descriptor or a port. @var{size} may be omitted if @var{obj} is not\n" | |
1150 | "a file name, in which case the truncation occurs at the current port.\n" | |
1151 | "position.\n\n" | |
1152 | "The return value is unspecified.") | |
1bbd0b84 | 1153 | #define FUNC_NAME s_scm_truncate_file |
840ae05d | 1154 | { |
69bc9ff3 GH |
1155 | int rv; |
1156 | off_t c_length; | |
1157 | ||
1158 | /* object can be a port, fdes or filename. */ | |
840ae05d | 1159 | |
840ae05d JB |
1160 | if (SCM_UNBNDP (length)) |
1161 | { | |
69bc9ff3 | 1162 | /* must supply length if object is a filename. */ |
0c95b57d | 1163 | if (SCM_ROSTRINGP (object)) |
c1bfcf60 | 1164 | SCM_MISC_ERROR("must supply length if OBJECT is a filename",SCM_EOL); |
69bc9ff3 | 1165 | |
c94577b4 | 1166 | length = scm_seek (object, SCM_INUM0, SCM_MAKINUM (SEEK_CUR)); |
840ae05d | 1167 | } |
1bbd0b84 | 1168 | c_length = SCM_NUM2LONG (2,length); |
69bc9ff3 | 1169 | if (c_length < 0) |
1bbd0b84 | 1170 | SCM_MISC_ERROR ("negative offset", SCM_EOL); |
3fe6190f | 1171 | |
69bc9ff3 GH |
1172 | object = SCM_COERCE_OUTPORT (object); |
1173 | if (SCM_INUMP (object)) | |
1174 | { | |
1175 | SCM_SYSCALL (rv = ftruncate (SCM_INUM (object), c_length)); | |
1176 | } | |
0c95b57d | 1177 | else if (SCM_OPOUTPORTP (object)) |
69bc9ff3 GH |
1178 | { |
1179 | scm_port *pt = SCM_PTAB_ENTRY (object); | |
f12733c9 | 1180 | scm_ptob_descriptor *ptob = scm_ptobs + SCM_PTOBNUM (object); |
69bc9ff3 | 1181 | |
affc96b5 | 1182 | if (!ptob->truncate) |
1bbd0b84 | 1183 | SCM_MISC_ERROR ("port is not truncatable", SCM_EOL); |
69bc9ff3 | 1184 | if (pt->rw_active == SCM_PORT_READ) |
affc96b5 | 1185 | scm_end_input (object); |
69bc9ff3 | 1186 | else if (pt->rw_active == SCM_PORT_WRITE) |
affc96b5 | 1187 | ptob->flush (object); |
69bc9ff3 | 1188 | |
affc96b5 | 1189 | ptob->truncate (object, c_length); |
69bc9ff3 GH |
1190 | rv = 0; |
1191 | } | |
1192 | else | |
1193 | { | |
3b3b36dd | 1194 | SCM_VALIDATE_ROSTRING (1,object); |
69bc9ff3 GH |
1195 | SCM_COERCE_SUBSTR (object); |
1196 | SCM_SYSCALL (rv = truncate (SCM_ROCHARS (object), c_length)); | |
1197 | } | |
1198 | if (rv == -1) | |
1bbd0b84 | 1199 | SCM_SYSERROR; |
840ae05d JB |
1200 | return SCM_UNSPECIFIED; |
1201 | } | |
1bbd0b84 | 1202 | #undef FUNC_NAME |
840ae05d | 1203 | |
a1ec6916 | 1204 | SCM_DEFINE (scm_port_line, "port-line", 1, 0, 0, |
1bbd0b84 | 1205 | (SCM port), |
b450f070 | 1206 | "Return the current line number for PORT.") |
1bbd0b84 | 1207 | #define FUNC_NAME s_scm_port_line |
0f2d19dd | 1208 | { |
78446828 | 1209 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd | 1210 | SCM_VALIDATE_OPENPORT (1,port); |
360fc44c | 1211 | return SCM_MAKINUM (SCM_LINUM (port)); |
0f2d19dd | 1212 | } |
1bbd0b84 | 1213 | #undef FUNC_NAME |
0f2d19dd | 1214 | |
a1ec6916 | 1215 | SCM_DEFINE (scm_set_port_line_x, "set-port-line!", 2, 0, 0, |
1bbd0b84 | 1216 | (SCM port, SCM line), |
b450f070 | 1217 | "Set the current line number for PORT to LINE.") |
1bbd0b84 | 1218 | #define FUNC_NAME s_scm_set_port_line_x |
d043d8c2 | 1219 | { |
360fc44c | 1220 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd GB |
1221 | SCM_VALIDATE_OPENPORT (1,port); |
1222 | SCM_VALIDATE_INUM (2,line); | |
564478fd GB |
1223 | SCM_PTAB_ENTRY (port)->line_number = SCM_INUM (line); |
1224 | return SCM_UNSPECIFIED; | |
d043d8c2 | 1225 | } |
1bbd0b84 | 1226 | #undef FUNC_NAME |
d043d8c2 | 1227 | |
a1ec6916 | 1228 | SCM_DEFINE (scm_port_column, "port-column", 1, 0, 0, |
1bbd0b84 | 1229 | (SCM port), |
b380b885 MD |
1230 | "@deffnx primitive port-line [input-port]\n" |
1231 | "Return the current column number or line number of @var{input-port},\n" | |
1232 | "using the current input port if none is specified. If the number is\n" | |
1233 | "unknown, the result is #f. Otherwise, the result is a 0-origin integer\n" | |
1234 | "- i.e. the first character of the first line is line 0, column 0.\n" | |
1235 | "(However, when you display a file position, for example in an error\n" | |
1236 | "message, we recommand you add 1 to get 1-origin integers. This is\n" | |
1237 | "because lines and column numbers traditionally start with 1, and that is\n" | |
1238 | "what non-programmers will find most natural.)") | |
1bbd0b84 | 1239 | #define FUNC_NAME s_scm_port_column |
0f2d19dd | 1240 | { |
78446828 | 1241 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd | 1242 | SCM_VALIDATE_OPENPORT (1,port); |
360fc44c | 1243 | return SCM_MAKINUM (SCM_COL (port)); |
0f2d19dd | 1244 | } |
1bbd0b84 | 1245 | #undef FUNC_NAME |
0f2d19dd | 1246 | |
a1ec6916 | 1247 | SCM_DEFINE (scm_set_port_column_x, "set-port-column!", 2, 0, 0, |
1bbd0b84 | 1248 | (SCM port, SCM column), |
564478fd | 1249 | "@deffnx primitive set-port-column! [input-port] column\n" |
b380b885 MD |
1250 | "Set the current column or line number of @var{input-port}, using the\n" |
1251 | "current input port if none is specified.") | |
1bbd0b84 | 1252 | #define FUNC_NAME s_scm_set_port_column_x |
d043d8c2 | 1253 | { |
360fc44c | 1254 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd GB |
1255 | SCM_VALIDATE_OPENPORT (1,port); |
1256 | SCM_VALIDATE_INUM (2,column); | |
564478fd GB |
1257 | SCM_PTAB_ENTRY (port)->column_number = SCM_INUM (column); |
1258 | return SCM_UNSPECIFIED; | |
d043d8c2 | 1259 | } |
1bbd0b84 | 1260 | #undef FUNC_NAME |
d043d8c2 | 1261 | |
a1ec6916 | 1262 | SCM_DEFINE (scm_port_filename, "port-filename", 1, 0, 0, |
1bbd0b84 | 1263 | (SCM port), |
b380b885 | 1264 | "Return the filename associated with @var{port}. This function returns\n" |
a3c8b9fc MD |
1265 | "the strings \"standard input\", \"standard output\" and \"standard error\"" |
1266 | "when called on the current input, output and error ports respectively.") | |
1bbd0b84 | 1267 | #define FUNC_NAME s_scm_port_filename |
0f2d19dd | 1268 | { |
78446828 | 1269 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd | 1270 | SCM_VALIDATE_OPENPORT (1,port); |
360fc44c | 1271 | return SCM_PTAB_ENTRY (port)->file_name; |
0f2d19dd | 1272 | } |
1bbd0b84 | 1273 | #undef FUNC_NAME |
0f2d19dd | 1274 | |
a1ec6916 | 1275 | SCM_DEFINE (scm_set_port_filename_x, "set-port-filename!", 2, 0, 0, |
1bbd0b84 | 1276 | (SCM port, SCM filename), |
b380b885 MD |
1277 | "Change the filename associated with @var{port}, using the current input\n" |
1278 | "port if none is specified. Note that this does not change the port's\n" | |
1279 | "source of data, but only the value that is returned by\n" | |
1280 | "@code{port-filename} and reported in diagnostic output.") | |
1bbd0b84 | 1281 | #define FUNC_NAME s_scm_set_port_filename_x |
d14af9f2 | 1282 | { |
360fc44c | 1283 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd | 1284 | SCM_VALIDATE_OPENPORT (1,port); |
360fc44c | 1285 | /* We allow the user to set the filename to whatever he likes. */ |
d14af9f2 MD |
1286 | return SCM_PTAB_ENTRY (port)->file_name = filename; |
1287 | } | |
1bbd0b84 | 1288 | #undef FUNC_NAME |
d14af9f2 | 1289 | |
0f2d19dd JB |
1290 | #ifndef ttyname |
1291 | extern char * ttyname(); | |
1292 | #endif | |
1293 | ||
f12733c9 MD |
1294 | void |
1295 | scm_print_port_mode (SCM exp, SCM port) | |
1296 | { | |
1297 | scm_puts (SCM_CLOSEDP (exp) | |
1298 | ? "closed: " | |
f1267706 MD |
1299 | : (SCM_RDNG & SCM_UNPACK_CAR (exp) |
1300 | ? (SCM_WRTNG & SCM_UNPACK_CAR (exp) | |
f12733c9 MD |
1301 | ? "input-output: " |
1302 | : "input: ") | |
f1267706 | 1303 | : (SCM_WRTNG & SCM_UNPACK_CAR (exp) |
f12733c9 MD |
1304 | ? "output: " |
1305 | : "bogus: ")), | |
1306 | port); | |
1307 | } | |
1cc91f1b | 1308 | |
f12733c9 MD |
1309 | int |
1310 | scm_port_print (SCM exp, SCM port, scm_print_state *pstate) | |
0f2d19dd | 1311 | { |
f12733c9 MD |
1312 | char *type = SCM_PTOBNAME (SCM_PTOBNUM (exp)); |
1313 | if (!type) | |
1314 | type = "port"; | |
b7f3516f | 1315 | scm_puts ("#<", port); |
f12733c9 | 1316 | scm_print_port_mode (exp, port); |
b7f3516f TT |
1317 | scm_puts (type, port); |
1318 | scm_putc (' ', port); | |
12a8b769 | 1319 | scm_intprint (SCM_CELL_WORD_1 (exp), 16, port); |
b7f3516f | 1320 | scm_putc ('>', port); |
f12733c9 | 1321 | return 1; |
0f2d19dd JB |
1322 | } |
1323 | ||
f12733c9 MD |
1324 | extern void scm_make_fptob (); |
1325 | extern void scm_make_stptob (); | |
1326 | extern void scm_make_sfptob (); | |
1cc91f1b | 1327 | |
0f2d19dd JB |
1328 | void |
1329 | scm_ports_prehistory () | |
0f2d19dd JB |
1330 | { |
1331 | scm_numptob = 0; | |
f12733c9 | 1332 | scm_ptobs = (scm_ptob_descriptor *) malloc (sizeof (scm_ptob_descriptor)); |
0f2d19dd JB |
1333 | |
1334 | /* WARNING: These scm_newptob calls must be done in this order. | |
1335 | * They must agree with the port declarations in tags.h. | |
1336 | */ | |
f12733c9 MD |
1337 | /* scm_tc16_fport = */ scm_make_fptob (); |
1338 | /* scm_tc16_pipe was here */ scm_make_fptob (); /* dummy. */ | |
1339 | /* scm_tc16_strport = */ scm_make_stptob (); | |
1340 | /* scm_tc16_sfport = */ scm_make_sfptob (); | |
0f2d19dd | 1341 | } |
0f2d19dd JB |
1342 | |
1343 | \f | |
ee149d03 | 1344 | |
d68fee48 | 1345 | /* Void ports. */ |
0f2d19dd | 1346 | |
f12733c9 | 1347 | long scm_tc16_void_port = 0; |
0f2d19dd | 1348 | |
70df8af6 | 1349 | static int fill_input_void_port (SCM port) |
283a1a0e | 1350 | { |
70df8af6 | 1351 | return EOF; |
283a1a0e GH |
1352 | } |
1353 | ||
31703ab8 | 1354 | static void |
8aa011a1 | 1355 | write_void_port (SCM port, const void *data, size_t size) |
31703ab8 GH |
1356 | { |
1357 | } | |
1358 | ||
0f2d19dd | 1359 | SCM |
a284e297 | 1360 | scm_void_port (char *mode_str) |
0f2d19dd JB |
1361 | { |
1362 | int mode_bits; | |
1363 | SCM answer; | |
840ae05d | 1364 | scm_port * pt; |
0f2d19dd JB |
1365 | |
1366 | SCM_NEWCELL (answer); | |
1367 | SCM_DEFER_INTS; | |
1368 | mode_bits = scm_mode_bits (mode_str); | |
1369 | pt = scm_add_to_port_table (answer); | |
70df8af6 | 1370 | scm_port_non_buffer (pt); |
0f2d19dd | 1371 | SCM_SETPTAB_ENTRY (answer, pt); |
ee149d03 | 1372 | SCM_SETSTREAM (answer, 0); |
54778cd3 | 1373 | SCM_SET_CELL_TYPE (answer, scm_tc16_void_port | mode_bits); |
0f2d19dd JB |
1374 | SCM_ALLOW_INTS; |
1375 | return answer; | |
1376 | } | |
1377 | ||
a1ec6916 | 1378 | SCM_DEFINE (scm_sys_make_void_port, "%make-void-port", 1, 0, 0, |
1bbd0b84 | 1379 | (SCM mode), |
70df8af6 GH |
1380 | "Create and return a new void port. A void port acts like\n" |
1381 | "/dev/null. The @var{mode} argument\n" | |
1382 | "specifies the input/output modes for this port: see the\n" | |
b380b885 | 1383 | "documentation for @code{open-file} in @ref{File Ports}.") |
1bbd0b84 | 1384 | #define FUNC_NAME s_scm_sys_make_void_port |
0f2d19dd | 1385 | { |
3b3b36dd | 1386 | SCM_VALIDATE_ROSTRING (1,mode); |
89958ad0 | 1387 | SCM_COERCE_SUBSTR (mode); |
0f2d19dd JB |
1388 | return scm_void_port (SCM_ROCHARS (mode)); |
1389 | } | |
1bbd0b84 | 1390 | #undef FUNC_NAME |
0f2d19dd | 1391 | |
0f2d19dd | 1392 | \f |
89545eba | 1393 | /* Initialization. */ |
1cc91f1b | 1394 | |
0f2d19dd JB |
1395 | void |
1396 | scm_init_ports () | |
0f2d19dd | 1397 | { |
840ae05d JB |
1398 | /* lseek() symbols. */ |
1399 | scm_sysintern ("SEEK_SET", SCM_MAKINUM (SEEK_SET)); | |
1400 | scm_sysintern ("SEEK_CUR", SCM_MAKINUM (SEEK_CUR)); | |
1401 | scm_sysintern ("SEEK_END", SCM_MAKINUM (SEEK_END)); | |
1402 | ||
70df8af6 GH |
1403 | scm_tc16_void_port = scm_make_port_type ("void", fill_input_void_port, |
1404 | write_void_port); | |
a0599745 | 1405 | #include "libguile/ports.x" |
0f2d19dd | 1406 | } |
89e00824 ML |
1407 | |
1408 | /* | |
1409 | Local Variables: | |
1410 | c-file-style: "gnu" | |
1411 | End: | |
1412 | */ |