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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; | |
f9a64404 | 94 | openp = SCM_CELL_WORD_0 (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) |
2500356c DH |
154 | { |
155 | ptoberr: | |
156 | scm_memory_error ("scm_make_port_type"); | |
157 | } | |
f12733c9 MD |
158 | /* Make a class object if Goops is present */ |
159 | if (scm_port_class) | |
160 | scm_make_port_classes (scm_numptob - 1, SCM_PTOBNAME (scm_numptob - 1)); | |
0f2d19dd JB |
161 | return scm_tc7_port + (scm_numptob - 1) * 256; |
162 | } | |
163 | ||
f12733c9 | 164 | void |
6c747373 | 165 | scm_set_port_mark (long tc, SCM (*mark) (SCM)) |
f12733c9 MD |
166 | { |
167 | scm_ptobs[SCM_TC2PTOBNUM (tc)].mark = mark; | |
168 | } | |
169 | ||
170 | void | |
6c747373 | 171 | scm_set_port_free (long tc, scm_sizet (*free) (SCM)) |
f12733c9 MD |
172 | { |
173 | scm_ptobs[SCM_TC2PTOBNUM (tc)].free = free; | |
174 | } | |
175 | ||
176 | void | |
6c747373 | 177 | scm_set_port_print (long tc, int (*print) (SCM exp, SCM port, |
f12733c9 MD |
178 | scm_print_state *pstate)) |
179 | { | |
180 | scm_ptobs[SCM_TC2PTOBNUM (tc)].print = print; | |
181 | } | |
182 | ||
183 | void | |
6c747373 | 184 | scm_set_port_equalp (long tc, SCM (*equalp) (SCM, SCM)) |
f12733c9 MD |
185 | { |
186 | scm_ptobs[SCM_TC2PTOBNUM (tc)].equalp = equalp; | |
187 | } | |
188 | ||
31703ab8 | 189 | void |
affc96b5 | 190 | scm_set_port_flush (long tc, void (*flush) (SCM port)) |
31703ab8 | 191 | { |
affc96b5 | 192 | scm_ptobs[SCM_TC2PTOBNUM (tc)].flush = flush; |
31703ab8 GH |
193 | } |
194 | ||
f12733c9 | 195 | void |
affc96b5 | 196 | scm_set_port_end_input (long tc, void (*end_input) (SCM port, int offset)) |
f12733c9 | 197 | { |
affc96b5 | 198 | scm_ptobs[SCM_TC2PTOBNUM (tc)].end_input = end_input; |
f12733c9 MD |
199 | } |
200 | ||
201 | void | |
6c747373 | 202 | scm_set_port_close (long tc, int (*close) (SCM)) |
f12733c9 | 203 | { |
affc96b5 | 204 | scm_ptobs[SCM_TC2PTOBNUM (tc)].close = close; |
f12733c9 MD |
205 | } |
206 | ||
207 | void | |
6c747373 | 208 | scm_set_port_seek (long tc, off_t (*seek) (SCM port, |
f12733c9 MD |
209 | off_t OFFSET, |
210 | int WHENCE)) | |
211 | { | |
212 | scm_ptobs[SCM_TC2PTOBNUM (tc)].seek = seek; | |
213 | } | |
214 | ||
215 | void | |
6c747373 | 216 | scm_set_port_truncate (long tc, void (*truncate) (SCM port, off_t length)) |
f12733c9 | 217 | { |
affc96b5 | 218 | scm_ptobs[SCM_TC2PTOBNUM (tc)].truncate = truncate; |
f12733c9 MD |
219 | } |
220 | ||
221 | void | |
affc96b5 | 222 | scm_set_port_input_waiting (long tc, int (*input_waiting) (SCM)) |
f12733c9 | 223 | { |
affc96b5 | 224 | scm_ptobs[SCM_TC2PTOBNUM (tc)].input_waiting = input_waiting; |
f12733c9 MD |
225 | } |
226 | ||
0f2d19dd | 227 | \f |
0f2d19dd | 228 | |
3b3b36dd | 229 | SCM_DEFINE (scm_char_ready_p, "char-ready?", 0, 1, 0, |
1bbd0b84 | 230 | (SCM port), |
bfc46627 GB |
231 | "Returns @code{#t} if a character is ready on input @var{port} and\n" |
232 | "returns @code{#f} otherwise. If @code{char-ready?} returns @code{#t}\n" | |
233 | "then the next @code{read-char} operation on @var{port} is\n" | |
234 | "guaranteed not to hang. If @var{port} is a file port at end of\n" | |
235 | "file then @code{char-ready?} returns @code{#t}.\n" | |
236 | "@footnote{@code{char-ready?} exists to make it possible for a\n" | |
237 | "program to accept characters from interactive ports without getting\n" | |
238 | "stuck waiting for input. Any input editors associated with such ports\n" | |
239 | "must make sure that characters whose existence has been asserted by\n" | |
240 | "@code{char-ready?} cannot be rubbed out. If @code{char-ready?} were to\n" | |
241 | "return @code{#f} at end of file, a port at end of file would be\n" | |
242 | "indistinguishable from an interactive port that has no ready\n" | |
243 | "characters.}") | |
1bbd0b84 | 244 | #define FUNC_NAME s_scm_char_ready_p |
0f2d19dd | 245 | { |
ae4c4016 | 246 | scm_port *pt; |
6c951427 | 247 | |
0f2d19dd JB |
248 | if (SCM_UNBNDP (port)) |
249 | port = scm_cur_inp; | |
250 | else | |
3b3b36dd | 251 | SCM_VALIDATE_OPINPORT (1,port); |
d68fee48 | 252 | |
ae4c4016 JB |
253 | pt = SCM_PTAB_ENTRY (port); |
254 | ||
6c951427 GH |
255 | /* if the current read buffer is filled, or the |
256 | last pushed-back char has been read and the saved buffer is | |
257 | filled, result is true. */ | |
258 | if (pt->read_pos < pt->read_end | |
259 | || (pt->read_buf == pt->putback_buf | |
260 | && pt->saved_read_pos < pt->saved_read_end)) | |
0f2d19dd | 261 | return SCM_BOOL_T; |
ee149d03 JB |
262 | else |
263 | { | |
f12733c9 | 264 | scm_ptob_descriptor *ptob = &scm_ptobs[SCM_PTOBNUM (port)]; |
ee149d03 | 265 | |
affc96b5 | 266 | if (ptob->input_waiting) |
1bbd0b84 | 267 | return SCM_BOOL(ptob->input_waiting (port)); |
ee149d03 | 268 | else |
6c951427 | 269 | return SCM_BOOL_T; |
ee149d03 | 270 | } |
0f2d19dd | 271 | } |
1bbd0b84 | 272 | #undef FUNC_NAME |
0f2d19dd | 273 | |
6c951427 | 274 | /* Clear a port's read buffers, returning the contents. */ |
a1ec6916 | 275 | SCM_DEFINE (scm_drain_input, "drain-input", 1, 0, 0, |
1bbd0b84 | 276 | (SCM port), |
b380b885 MD |
277 | "Drains @var{PORT}'s read buffers (including any pushed-back characters)\n" |
278 | "and returns the contents as a single string.") | |
1bbd0b84 | 279 | #define FUNC_NAME s_scm_drain_input |
ee149d03 | 280 | { |
840ae05d JB |
281 | SCM result; |
282 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
6c951427 | 283 | int count; |
840ae05d | 284 | char *dst; |
ee149d03 | 285 | |
3b3b36dd | 286 | SCM_VALIDATE_OPINPORT (1,port); |
840ae05d | 287 | |
6c951427 GH |
288 | count = pt->read_end - pt->read_pos; |
289 | if (pt->read_buf == pt->putback_buf) | |
290 | count += pt->saved_read_end - pt->saved_read_pos; | |
840ae05d | 291 | |
6c951427 | 292 | result = scm_makstr (count, 0); |
86c991c2 | 293 | dst = SCM_STRING_CHARS (result); |
840ae05d JB |
294 | |
295 | while (pt->read_pos < pt->read_end) | |
6c951427 GH |
296 | *dst++ = *(pt->read_pos++); |
297 | ||
298 | if (pt->read_buf == pt->putback_buf) | |
840ae05d | 299 | { |
6c951427 GH |
300 | while (pt->saved_read_pos < pt->saved_read_end) |
301 | *dst++ = *(pt->saved_read_pos++); | |
840ae05d | 302 | } |
6c951427 | 303 | |
840ae05d | 304 | return result; |
ee149d03 | 305 | } |
1bbd0b84 | 306 | #undef FUNC_NAME |
0f2d19dd JB |
307 | |
308 | \f | |
d68fee48 | 309 | /* Standard ports --- current input, output, error, and more(!). */ |
0f2d19dd | 310 | |
3b3b36dd | 311 | SCM_DEFINE (scm_current_input_port, "current-input-port", 0, 0, 0, |
1bbd0b84 | 312 | (), |
bfc46627 GB |
313 | "Returns the current input port. This is the default port used by many\n" |
314 | "input procedures. Initially, @code{current-input-port} returns the\n" | |
315 | "value of @code{???}.") | |
1bbd0b84 | 316 | #define FUNC_NAME s_scm_current_input_port |
0f2d19dd JB |
317 | { |
318 | return scm_cur_inp; | |
319 | } | |
1bbd0b84 | 320 | #undef FUNC_NAME |
0f2d19dd | 321 | |
3b3b36dd | 322 | SCM_DEFINE (scm_current_output_port, "current-output-port", 0, 0, 0, |
1bbd0b84 | 323 | (), |
bfc46627 GB |
324 | "Returns the current output port. This is the default port used by many\n" |
325 | "output procedures. Initially, @code{current-output-port} returns the\n" | |
326 | "value of @code{???}.") | |
1bbd0b84 | 327 | #define FUNC_NAME s_scm_current_output_port |
0f2d19dd JB |
328 | { |
329 | return scm_cur_outp; | |
330 | } | |
1bbd0b84 | 331 | #undef FUNC_NAME |
0f2d19dd | 332 | |
3b3b36dd | 333 | SCM_DEFINE (scm_current_error_port, "current-error-port", 0, 0, 0, |
1bbd0b84 | 334 | (), |
b380b885 MD |
335 | "Return the port to which errors and warnings should be sent (the\n" |
336 | "@dfn{standard error} in Unix and C terminology).") | |
1bbd0b84 | 337 | #define FUNC_NAME s_scm_current_error_port |
0f2d19dd JB |
338 | { |
339 | return scm_cur_errp; | |
340 | } | |
1bbd0b84 | 341 | #undef FUNC_NAME |
0f2d19dd | 342 | |
3b3b36dd | 343 | SCM_DEFINE (scm_current_load_port, "current-load-port", 0, 0, 0, |
1bbd0b84 | 344 | (), |
b450f070 GB |
345 | "Return the current-load-port.\n" |
346 | "The load port is used internally by `primitive-load'.") | |
1bbd0b84 | 347 | #define FUNC_NAME s_scm_current_load_port |
31614d8e MD |
348 | { |
349 | return scm_cur_loadp; | |
350 | } | |
1bbd0b84 | 351 | #undef FUNC_NAME |
31614d8e | 352 | |
3b3b36dd | 353 | SCM_DEFINE (scm_set_current_input_port, "set-current-input-port", 1, 0, 0, |
1bbd0b84 | 354 | (SCM port), |
b380b885 MD |
355 | "@deffnx primitive set-current-output-port port\n" |
356 | "@deffnx primitive set-current-error-port port\n" | |
357 | "Change the ports returned by @code{current-input-port},\n" | |
358 | "@code{current-output-port} and @code{current-error-port}, respectively,\n" | |
359 | "so that they use the supplied @var{port} for input or output.") | |
1bbd0b84 | 360 | #define FUNC_NAME s_scm_set_current_input_port |
0f2d19dd JB |
361 | { |
362 | SCM oinp = scm_cur_inp; | |
3b3b36dd | 363 | SCM_VALIDATE_OPINPORT (1,port); |
0f2d19dd JB |
364 | scm_cur_inp = port; |
365 | return oinp; | |
366 | } | |
1bbd0b84 | 367 | #undef FUNC_NAME |
0f2d19dd JB |
368 | |
369 | ||
3b3b36dd | 370 | SCM_DEFINE (scm_set_current_output_port, "set-current-output-port", 1, 0, 0, |
1bbd0b84 | 371 | (SCM port), |
b450f070 | 372 | "Set the current default output port to PORT.") |
1bbd0b84 | 373 | #define FUNC_NAME s_scm_set_current_output_port |
0f2d19dd JB |
374 | { |
375 | SCM ooutp = scm_cur_outp; | |
78446828 | 376 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd | 377 | SCM_VALIDATE_OPOUTPORT (1,port); |
0f2d19dd JB |
378 | scm_cur_outp = port; |
379 | return ooutp; | |
380 | } | |
1bbd0b84 | 381 | #undef FUNC_NAME |
0f2d19dd JB |
382 | |
383 | ||
3b3b36dd | 384 | SCM_DEFINE (scm_set_current_error_port, "set-current-error-port", 1, 0, 0, |
1bbd0b84 | 385 | (SCM port), |
b450f070 | 386 | "Set the current default error port to PORT.") |
1bbd0b84 | 387 | #define FUNC_NAME s_scm_set_current_error_port |
0f2d19dd JB |
388 | { |
389 | SCM oerrp = scm_cur_errp; | |
78446828 | 390 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd | 391 | SCM_VALIDATE_OPOUTPORT (1,port); |
0f2d19dd JB |
392 | scm_cur_errp = port; |
393 | return oerrp; | |
394 | } | |
1bbd0b84 | 395 | #undef FUNC_NAME |
0f2d19dd JB |
396 | |
397 | \f | |
840ae05d | 398 | /* The port table --- an array of pointers to ports. */ |
0f2d19dd | 399 | |
840ae05d | 400 | scm_port **scm_port_table; |
0f2d19dd JB |
401 | |
402 | int scm_port_table_size = 0; /* Number of ports in scm_port_table. */ | |
403 | int scm_port_table_room = 20; /* Size of the array. */ | |
404 | ||
ee149d03 | 405 | /* Add a port to the table. */ |
1cc91f1b | 406 | |
840ae05d | 407 | scm_port * |
a284e297 | 408 | scm_add_to_port_table (SCM port) |
0f2d19dd | 409 | { |
840ae05d JB |
410 | scm_port *entry; |
411 | ||
0f2d19dd JB |
412 | if (scm_port_table_size == scm_port_table_room) |
413 | { | |
ee149d03 | 414 | void *newt = realloc ((char *) scm_port_table, |
840ae05d | 415 | (scm_sizet) (sizeof (scm_port *) |
ee149d03 JB |
416 | * scm_port_table_room * 2)); |
417 | if (newt == NULL) | |
840ae05d JB |
418 | scm_memory_error ("scm_add_to_port_table"); |
419 | scm_port_table = (scm_port **) newt; | |
0f2d19dd JB |
420 | scm_port_table_room *= 2; |
421 | } | |
840ae05d JB |
422 | entry = (scm_port *) malloc (sizeof (scm_port)); |
423 | if (entry == NULL) | |
424 | scm_memory_error ("scm_add_to_port_table"); | |
425 | ||
426 | entry->port = port; | |
427 | entry->entry = scm_port_table_size; | |
428 | entry->revealed = 0; | |
429 | entry->stream = 0; | |
430 | entry->file_name = SCM_BOOL_F; | |
431 | entry->line_number = 0; | |
432 | entry->column_number = 0; | |
6c951427 GH |
433 | entry->putback_buf = 0; |
434 | entry->putback_buf_size = 0; | |
61e452ba | 435 | entry->rw_active = SCM_PORT_NEITHER; |
0de97b83 | 436 | entry->rw_random = 0; |
840ae05d JB |
437 | |
438 | scm_port_table[scm_port_table_size] = entry; | |
439 | scm_port_table_size++; | |
440 | ||
441 | return entry; | |
0f2d19dd JB |
442 | } |
443 | ||
6c951427 | 444 | /* Remove a port from the table and destroy it. */ |
1cc91f1b | 445 | |
0f2d19dd | 446 | void |
a284e297 | 447 | scm_remove_from_port_table (SCM port) |
0f2d19dd | 448 | { |
840ae05d | 449 | scm_port *p = SCM_PTAB_ENTRY (port); |
ee1e7e13 | 450 | int i = p->entry; |
6c951427 | 451 | |
ee1e7e13 MD |
452 | if (i >= scm_port_table_size) |
453 | scm_wta (port, "Port not in table", "scm_remove_from_port_table"); | |
6c951427 GH |
454 | if (p->putback_buf) |
455 | free (p->putback_buf); | |
840ae05d | 456 | free (p); |
ee1e7e13 MD |
457 | /* Since we have just freed slot i we can shrink the table by moving |
458 | the last entry to that slot... */ | |
459 | if (i < scm_port_table_size - 1) | |
0f2d19dd | 460 | { |
ee1e7e13 MD |
461 | scm_port_table[i] = scm_port_table[scm_port_table_size - 1]; |
462 | scm_port_table[i]->entry = i; | |
0f2d19dd | 463 | } |
0f2d19dd JB |
464 | SCM_SETPTAB_ENTRY (port, 0); |
465 | scm_port_table_size--; | |
466 | } | |
467 | ||
fea6b4ea | 468 | #ifdef GUILE_DEBUG |
b450f070 | 469 | /* Functions for debugging. */ |
1cc91f1b | 470 | |
3b3b36dd | 471 | SCM_DEFINE (scm_pt_size, "pt-size", 0, 0, 0, |
b450f070 GB |
472 | (), |
473 | "Returns the number of ports in the port table.\n" | |
474 | "`pt-size' is only included in GUILE_DEBUG builds.") | |
1bbd0b84 | 475 | #define FUNC_NAME s_scm_pt_size |
0f2d19dd JB |
476 | { |
477 | return SCM_MAKINUM (scm_port_table_size); | |
478 | } | |
1bbd0b84 | 479 | #undef FUNC_NAME |
0f2d19dd | 480 | |
3b3b36dd | 481 | SCM_DEFINE (scm_pt_member, "pt-member", 1, 0, 0, |
b450f070 GB |
482 | (SCM index), |
483 | "Returns the port at INDEX in the port table.\n" | |
484 | "`pt-member' is only included in GUILE_DEBUG builds.") | |
1bbd0b84 | 485 | #define FUNC_NAME s_scm_pt_member |
0f2d19dd JB |
486 | { |
487 | int i; | |
b450f070 | 488 | SCM_VALIDATE_INUM_COPY (1,index,i); |
0f2d19dd JB |
489 | if (i < 0 || i >= scm_port_table_size) |
490 | return SCM_BOOL_F; | |
491 | else | |
492 | return scm_port_table[i]->port; | |
493 | } | |
1bbd0b84 | 494 | #undef FUNC_NAME |
0f2d19dd JB |
495 | #endif |
496 | ||
70df8af6 GH |
497 | void |
498 | scm_port_non_buffer (scm_port *pt) | |
499 | { | |
500 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; | |
501 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
502 | pt->read_buf_size = pt->write_buf_size = 1; | |
503 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
504 | } | |
0f2d19dd | 505 | |
d68fee48 JB |
506 | \f |
507 | /* Revealed counts --- an oddity inherited from SCSH. */ | |
508 | ||
8b13c6b3 GH |
509 | /* Find a port in the table and return its revealed count. |
510 | Also used by the garbage collector. | |
0f2d19dd | 511 | */ |
1cc91f1b | 512 | |
0f2d19dd | 513 | int |
a284e297 | 514 | scm_revealed_count (SCM port) |
0f2d19dd JB |
515 | { |
516 | return SCM_REVEALED(port); | |
517 | } | |
518 | ||
519 | ||
520 | ||
521 | /* Return the revealed count for a port. */ | |
522 | ||
3b3b36dd | 523 | SCM_DEFINE (scm_port_revealed, "port-revealed", 1, 0, 0, |
1bbd0b84 | 524 | (SCM port), |
b380b885 | 525 | "Returns the revealed count for @var{port}.") |
1bbd0b84 | 526 | #define FUNC_NAME s_scm_port_revealed |
0f2d19dd | 527 | { |
78446828 | 528 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd | 529 | SCM_VALIDATE_PORT (1,port); |
8b13c6b3 | 530 | return SCM_MAKINUM (scm_revealed_count (port)); |
0f2d19dd | 531 | } |
1bbd0b84 | 532 | #undef FUNC_NAME |
0f2d19dd JB |
533 | |
534 | /* Set the revealed count for a port. */ | |
3b3b36dd | 535 | SCM_DEFINE (scm_set_port_revealed_x, "set-port-revealed!", 2, 0, 0, |
1bbd0b84 | 536 | (SCM port, SCM rcount), |
b450f070 | 537 | "Sets the revealed count for a port to a given value.\n" |
b380b885 | 538 | "The return value is unspecified.") |
1bbd0b84 | 539 | #define FUNC_NAME s_scm_set_port_revealed_x |
0f2d19dd | 540 | { |
78446828 | 541 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd GB |
542 | SCM_VALIDATE_PORT (1,port); |
543 | SCM_VALIDATE_INUM (2,rcount); | |
0f2d19dd | 544 | SCM_REVEALED (port) = SCM_INUM (rcount); |
8b13c6b3 | 545 | return SCM_UNSPECIFIED; |
0f2d19dd | 546 | } |
1bbd0b84 | 547 | #undef FUNC_NAME |
0f2d19dd | 548 | |
d68fee48 JB |
549 | |
550 | \f | |
551 | /* Retrieving a port's mode. */ | |
552 | ||
eadd48de GH |
553 | /* Return the flags that characterize a port based on the mode |
554 | * string used to open a file for that port. | |
555 | * | |
556 | * See PORT FLAGS in scm.h | |
557 | */ | |
558 | ||
559 | long | |
a284e297 | 560 | scm_mode_bits (char *modes) |
eadd48de GH |
561 | { |
562 | return (SCM_OPN | |
563 | | (strchr (modes, 'r') || strchr (modes, '+') ? SCM_RDNG : 0) | |
564 | | ( strchr (modes, 'w') | |
565 | || strchr (modes, 'a') | |
566 | || strchr (modes, '+') ? SCM_WRTNG : 0) | |
ee149d03 JB |
567 | | (strchr (modes, '0') ? SCM_BUF0 : 0) |
568 | | (strchr (modes, 'l') ? SCM_BUFLINE : 0)); | |
eadd48de GH |
569 | } |
570 | ||
571 | ||
572 | /* Return the mode flags from an open port. | |
573 | * Some modes such as "append" are only used when opening | |
574 | * a file and are not returned here. */ | |
575 | ||
3b3b36dd | 576 | SCM_DEFINE (scm_port_mode, "port-mode", 1, 0, 0, |
1bbd0b84 | 577 | (SCM port), |
b380b885 MD |
578 | "Returns the port modes associated with the open port @var{port}. These\n" |
579 | "will not necessarily be identical to the modes used when the port was\n" | |
580 | "opened, since modes such as \"append\" which are used only during\n" | |
581 | "port creation are not retained.") | |
1bbd0b84 | 582 | #define FUNC_NAME s_scm_port_mode |
eadd48de GH |
583 | { |
584 | char modes[3]; | |
585 | modes[0] = '\0'; | |
78446828 MV |
586 | |
587 | port = SCM_COERCE_OUTPORT (port); | |
3b3b36dd | 588 | SCM_VALIDATE_OPPORT (1,port); |
f9a64404 DH |
589 | if (SCM_CELL_WORD_0 (port) & SCM_RDNG) { |
590 | if (SCM_CELL_WORD_0 (port) & SCM_WRTNG) | |
eadd48de GH |
591 | strcpy (modes, "r+"); |
592 | else | |
593 | strcpy (modes, "r"); | |
594 | } | |
f9a64404 | 595 | else if (SCM_CELL_WORD_0 (port) & SCM_WRTNG) |
eadd48de | 596 | strcpy (modes, "w"); |
f9a64404 | 597 | if (SCM_CELL_WORD_0 (port) & SCM_BUF0) |
eadd48de GH |
598 | strcat (modes, "0"); |
599 | return scm_makfromstr (modes, strlen (modes), 0); | |
600 | } | |
1bbd0b84 | 601 | #undef FUNC_NAME |
eadd48de GH |
602 | |
603 | ||
d68fee48 JB |
604 | \f |
605 | /* Closing ports. */ | |
606 | ||
0f2d19dd JB |
607 | /* scm_close_port |
608 | * Call the close operation on a port object. | |
eadd48de | 609 | * see also scm_close. |
0f2d19dd | 610 | */ |
3b3b36dd | 611 | SCM_DEFINE (scm_close_port, "close-port", 1, 0, 0, |
1bbd0b84 | 612 | (SCM port), |
b380b885 MD |
613 | "Close the specified port object. Returns @code{#t} if it successfully\n" |
614 | "closes a port or @code{#f} if it was already\n" | |
615 | "closed. An exception may be raised if an error occurs, for example\n" | |
616 | "when flushing buffered output.\n" | |
617 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" | |
618 | "which can close file descriptors.") | |
1bbd0b84 | 619 | #define FUNC_NAME s_scm_close_port |
0f2d19dd JB |
620 | { |
621 | scm_sizet i; | |
eadd48de GH |
622 | int rv; |
623 | ||
78446828 MV |
624 | port = SCM_COERCE_OUTPORT (port); |
625 | ||
7a754ca6 | 626 | SCM_VALIDATE_PORT (1, port); |
0f2d19dd | 627 | if (SCM_CLOSEDP (port)) |
eadd48de | 628 | return SCM_BOOL_F; |
0f2d19dd | 629 | i = SCM_PTOBNUM (port); |
affc96b5 GH |
630 | if (scm_ptobs[i].close) |
631 | rv = (scm_ptobs[i].close) (port); | |
eadd48de GH |
632 | else |
633 | rv = 0; | |
0f2d19dd | 634 | scm_remove_from_port_table (port); |
898a256f | 635 | SCM_SETAND_CAR (port, ~SCM_OPN); |
7a754ca6 MD |
636 | return SCM_NEGATE_BOOL (rv < 0); |
637 | } | |
638 | #undef FUNC_NAME | |
639 | ||
640 | SCM_DEFINE (scm_close_input_port, "close-input-port", 1, 0, 0, | |
641 | (SCM port), | |
642 | "Close the specified input port object. The routine has no effect if\n" | |
643 | "the file has already been closed. An exception may be raised if an\n" | |
644 | "error occurs. The value returned is unspecified.\n\n" | |
645 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" | |
646 | "which can close file descriptors.") | |
647 | #define FUNC_NAME s_scm_close_input_port | |
648 | { | |
649 | SCM_VALIDATE_INPUT_PORT (1, port); | |
650 | scm_close_port (port); | |
651 | return SCM_UNSPECIFIED; | |
652 | } | |
653 | #undef FUNC_NAME | |
654 | ||
655 | SCM_DEFINE (scm_close_output_port, "close-output-port", 1, 0, 0, | |
656 | (SCM port), | |
657 | "Close the specified output port object. The routine has no effect if\n" | |
658 | "the file has already been closed. An exception may be raised if an\n" | |
659 | "error occurs. The value returned is unspecified.\n\n" | |
660 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" | |
661 | "which can close file descriptors.") | |
662 | #define FUNC_NAME s_scm_close_output_port | |
663 | { | |
664 | port = SCM_COERCE_OUTPORT (port); | |
665 | SCM_VALIDATE_OUTPUT_PORT (1, port); | |
666 | scm_close_port (port); | |
667 | return SCM_UNSPECIFIED; | |
0f2d19dd | 668 | } |
1bbd0b84 | 669 | #undef FUNC_NAME |
0f2d19dd | 670 | |
3b3b36dd | 671 | SCM_DEFINE (scm_close_all_ports_except, "close-all-ports-except", 0, 0, 1, |
1bbd0b84 | 672 | (SCM ports), |
b380b885 MD |
673 | "Close all open file ports used by the interpreter\n" |
674 | "except for those supplied as arguments. This procedure\n" | |
675 | "is intended to be used before an exec call to close file descriptors\n" | |
b380b885 | 676 | "which are not needed in the new process.") |
1bbd0b84 | 677 | #define FUNC_NAME s_scm_close_all_ports_except |
0f2d19dd JB |
678 | { |
679 | int i = 0; | |
af45e3b0 | 680 | SCM_VALIDATE_REST_ARGUMENT (ports); |
0f2d19dd JB |
681 | while (i < scm_port_table_size) |
682 | { | |
683 | SCM thisport = scm_port_table[i]->port; | |
684 | int found = 0; | |
685 | SCM ports_ptr = ports; | |
686 | ||
687 | while (SCM_NNULLP (ports_ptr)) | |
688 | { | |
78446828 | 689 | SCM port = SCM_COERCE_OUTPORT (SCM_CAR (ports_ptr)); |
0f2d19dd | 690 | if (i == 0) |
3b3b36dd | 691 | SCM_VALIDATE_OPPORT (SCM_ARG1,port); |
54778cd3 | 692 | if (SCM_EQ_P (port, thisport)) |
0f2d19dd JB |
693 | found = 1; |
694 | ports_ptr = SCM_CDR (ports_ptr); | |
695 | } | |
696 | if (found) | |
697 | i++; | |
698 | else | |
699 | /* i is not to be incremented here. */ | |
700 | scm_close_port (thisport); | |
701 | } | |
0f2d19dd JB |
702 | return SCM_UNSPECIFIED; |
703 | } | |
1bbd0b84 | 704 | #undef FUNC_NAME |
0f2d19dd | 705 | |
d68fee48 JB |
706 | |
707 | \f | |
708 | /* Utter miscellany. Gosh, we should clean this up some time. */ | |
709 | ||
3b3b36dd | 710 | SCM_DEFINE (scm_input_port_p, "input-port?", 1, 0, 0, |
1bbd0b84 | 711 | (SCM x), |
bfc46627 GB |
712 | "Returns @code{#t} if @var{x} is an input port, otherwise returns\n" |
713 | "@code{#f}. Any object satisfying this predicate also satisfies\n" | |
714 | "@code{port?}.") | |
1bbd0b84 | 715 | #define FUNC_NAME s_scm_input_port_p |
0f2d19dd JB |
716 | { |
717 | if (SCM_IMP (x)) | |
4a94d8ca | 718 | return SCM_BOOL_F; |
f5f2dcff | 719 | return SCM_BOOL(SCM_INPUT_PORT_P (x)); |
0f2d19dd | 720 | } |
1bbd0b84 | 721 | #undef FUNC_NAME |
0f2d19dd | 722 | |
3b3b36dd | 723 | SCM_DEFINE (scm_output_port_p, "output-port?", 1, 0, 0, |
1bbd0b84 | 724 | (SCM x), |
bfc46627 GB |
725 | "Returns @code{#t} if @var{x} is an output port, otherwise returns\n" |
726 | "@code{#f}. Any object satisfying this predicate also satisfies\n" | |
727 | "@code{port?}.") | |
1bbd0b84 | 728 | #define FUNC_NAME s_scm_output_port_p |
0f2d19dd JB |
729 | { |
730 | if (SCM_IMP (x)) | |
4a94d8ca MD |
731 | return SCM_BOOL_F; |
732 | if (SCM_PORT_WITH_PS_P (x)) | |
733 | x = SCM_PORT_WITH_PS_PORT (x); | |
f5f2dcff | 734 | return SCM_BOOL(SCM_OUTPUT_PORT_P (x)); |
0f2d19dd | 735 | } |
1bbd0b84 | 736 | #undef FUNC_NAME |
0f2d19dd | 737 | |
3b3b36dd | 738 | SCM_DEFINE (scm_port_closed_p, "port-closed?", 1, 0, 0, |
1bbd0b84 | 739 | (SCM port), |
b380b885 | 740 | "Returns @code{#t} if @var{port} is closed or @code{#f} if it is open.") |
1bbd0b84 | 741 | #define FUNC_NAME s_scm_port_closed_p |
60d0643d | 742 | { |
c1bfcf60 | 743 | SCM_VALIDATE_PORT (1,port); |
1bbd0b84 | 744 | return SCM_NEGATE_BOOL(SCM_OPPORTP (port)); |
60d0643d | 745 | } |
1bbd0b84 | 746 | #undef FUNC_NAME |
0f2d19dd | 747 | |
3b3b36dd | 748 | SCM_DEFINE (scm_eof_object_p, "eof-object?", 1, 0, 0, |
1bbd0b84 | 749 | (SCM x), |
bfc46627 GB |
750 | "Returns @code{#t} if @var{x} is an end-of-file object; otherwise\n" |
751 | "returns @code{#f}.") | |
1bbd0b84 | 752 | #define FUNC_NAME s_scm_eof_object_p |
0f2d19dd | 753 | { |
1bbd0b84 | 754 | return SCM_BOOL(SCM_EOF_OBJECT_P (x)); |
0f2d19dd | 755 | } |
1bbd0b84 | 756 | #undef FUNC_NAME |
0f2d19dd | 757 | |
3b3b36dd | 758 | SCM_DEFINE (scm_force_output, "force-output", 0, 1, 0, |
1bbd0b84 | 759 | (SCM port), |
b380b885 MD |
760 | "Flush the specified output port, or the current output port if @var{port}\n" |
761 | "is omitted. The current output buffer contents are passed to the \n" | |
762 | "underlying port implementation (e.g., in the case of fports, the\n" | |
763 | "data will be written to the file and the output buffer will be cleared.)\n" | |
764 | "It has no effect on an unbuffered port.\n\n" | |
765 | "The return value is unspecified.") | |
1bbd0b84 | 766 | #define FUNC_NAME s_scm_force_output |
0f2d19dd JB |
767 | { |
768 | if (SCM_UNBNDP (port)) | |
3e877d15 | 769 | port = scm_cur_outp; |
0f2d19dd | 770 | else |
78446828 MV |
771 | { |
772 | port = SCM_COERCE_OUTPORT (port); | |
3b3b36dd | 773 | SCM_VALIDATE_OPOUTPORT (1,port); |
78446828 | 774 | } |
affc96b5 | 775 | scm_flush (port); |
ee149d03 | 776 | return SCM_UNSPECIFIED; |
0f2d19dd | 777 | } |
1bbd0b84 | 778 | #undef FUNC_NAME |
0f2d19dd | 779 | |
a1ec6916 | 780 | SCM_DEFINE (scm_flush_all_ports, "flush-all-ports", 0, 0, 0, |
1bbd0b84 | 781 | (), |
b380b885 MD |
782 | "Equivalent to calling @code{force-output} on\n" |
783 | "all open output ports. The return value is unspecified.") | |
1bbd0b84 | 784 | #define FUNC_NAME s_scm_flush_all_ports |
89ea5b7c GH |
785 | { |
786 | int i; | |
787 | ||
788 | for (i = 0; i < scm_port_table_size; i++) | |
789 | { | |
ee149d03 | 790 | if (SCM_OPOUTPORTP (scm_port_table[i]->port)) |
affc96b5 | 791 | scm_flush (scm_port_table[i]->port); |
89ea5b7c GH |
792 | } |
793 | return SCM_UNSPECIFIED; | |
794 | } | |
1bbd0b84 | 795 | #undef FUNC_NAME |
0f2d19dd | 796 | |
3b3b36dd | 797 | SCM_DEFINE (scm_read_char, "read-char", 0, 1, 0, |
1bbd0b84 | 798 | (SCM port), |
bfc46627 GB |
799 | "Returns the next character available from @var{port}, updating\n" |
800 | "@var{port} to point to the following character. If no more\n" | |
801 | "characters are available, an end-of-file object is returned.") | |
1bbd0b84 | 802 | #define FUNC_NAME s_scm_read_char |
0f2d19dd JB |
803 | { |
804 | int c; | |
805 | if (SCM_UNBNDP (port)) | |
334341aa | 806 | port = scm_cur_inp; |
3b3b36dd | 807 | SCM_VALIDATE_OPINPORT (1,port); |
b7f3516f | 808 | c = scm_getc (port); |
0f2d19dd JB |
809 | if (EOF == c) |
810 | return SCM_EOF_VAL; | |
7866a09b | 811 | return SCM_MAKE_CHAR (c); |
0f2d19dd | 812 | } |
1bbd0b84 | 813 | #undef FUNC_NAME |
0f2d19dd | 814 | |
5c070ca7 | 815 | /* this should only be called when the read buffer is empty. it |
affc96b5 | 816 | tries to refill the read buffer. it returns the first char from |
5c070ca7 | 817 | the port, which is either EOF or *(pt->read_pos). */ |
6c951427 | 818 | int |
affc96b5 | 819 | scm_fill_input (SCM port) |
6c951427 | 820 | { |
283a1a0e GH |
821 | scm_port *pt = SCM_PTAB_ENTRY (port); |
822 | ||
6c951427 GH |
823 | if (pt->read_buf == pt->putback_buf) |
824 | { | |
825 | /* finished reading put-back chars. */ | |
826 | pt->read_buf = pt->saved_read_buf; | |
827 | pt->read_pos = pt->saved_read_pos; | |
828 | pt->read_end = pt->saved_read_end; | |
829 | pt->read_buf_size = pt->saved_read_buf_size; | |
830 | if (pt->read_pos < pt->read_end) | |
5c070ca7 | 831 | return *(pt->read_pos); |
6c951427 | 832 | } |
affc96b5 | 833 | return scm_ptobs[SCM_PTOBNUM (port)].fill_input (port); |
6c951427 GH |
834 | } |
835 | ||
ee149d03 | 836 | int |
a284e297 | 837 | scm_getc (SCM port) |
0f2d19dd JB |
838 | { |
839 | int c; | |
840ae05d | 840 | scm_port *pt = SCM_PTAB_ENTRY (port); |
ee149d03 | 841 | |
840ae05d JB |
842 | if (pt->rw_active == SCM_PORT_WRITE) |
843 | { | |
affc96b5 GH |
844 | /* may be marginally faster than calling scm_flush. */ |
845 | scm_ptobs[SCM_PTOBNUM (port)].flush (port); | |
840ae05d | 846 | } |
6c951427 | 847 | |
5c070ca7 GH |
848 | if (pt->rw_random) |
849 | pt->rw_active = SCM_PORT_READ; | |
850 | ||
851 | if (pt->read_pos >= pt->read_end) | |
ee149d03 | 852 | { |
affc96b5 | 853 | if (scm_fill_input (port) == EOF) |
5c070ca7 | 854 | return EOF; |
ee149d03 JB |
855 | } |
856 | ||
5c070ca7 | 857 | c = *(pt->read_pos++); |
840ae05d | 858 | |
ee149d03 JB |
859 | if (c == '\n') |
860 | { | |
861 | SCM_INCLINE (port); | |
862 | } | |
863 | else if (c == '\t') | |
864 | { | |
865 | SCM_TABCOL (port); | |
866 | } | |
867 | else | |
868 | { | |
869 | SCM_INCCOL (port); | |
870 | } | |
871 | ||
872 | return c; | |
0f2d19dd JB |
873 | } |
874 | ||
ee149d03 | 875 | void |
a284e297 | 876 | scm_putc (char c, SCM port) |
ee149d03 | 877 | { |
265e6a4d | 878 | scm_lfwrite (&c, 1, port); |
ee149d03 | 879 | } |
3cb988bd | 880 | |
ee149d03 | 881 | void |
70d63753 | 882 | scm_puts (const char *s, SCM port) |
3cb988bd | 883 | { |
265e6a4d | 884 | scm_lfwrite (s, strlen (s), port); |
ee149d03 | 885 | } |
3cb988bd | 886 | |
ee149d03 | 887 | void |
70d63753 | 888 | scm_lfwrite (const char *ptr, scm_sizet size, SCM port) |
ee149d03 | 889 | { |
840ae05d | 890 | scm_port *pt = SCM_PTAB_ENTRY (port); |
f12733c9 | 891 | scm_ptob_descriptor *ptob = &scm_ptobs[SCM_PTOBNUM (port)]; |
3e2043c4 | 892 | |
840ae05d | 893 | if (pt->rw_active == SCM_PORT_READ) |
affc96b5 | 894 | scm_end_input (port); |
283a1a0e | 895 | |
31703ab8 | 896 | ptob->write (port, ptr, size); |
840ae05d JB |
897 | |
898 | if (pt->rw_random) | |
899 | pt->rw_active = SCM_PORT_WRITE; | |
ee149d03 | 900 | } |
3cb988bd | 901 | |
3cb988bd | 902 | |
ee149d03 | 903 | void |
a284e297 | 904 | scm_flush (SCM port) |
ee149d03 JB |
905 | { |
906 | scm_sizet i = SCM_PTOBNUM (port); | |
affc96b5 | 907 | (scm_ptobs[i].flush) (port); |
ee149d03 JB |
908 | } |
909 | ||
283a1a0e | 910 | void |
a284e297 | 911 | scm_end_input (SCM port) |
283a1a0e GH |
912 | { |
913 | int offset; | |
914 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
915 | ||
916 | if (pt->read_buf == pt->putback_buf) | |
917 | { | |
918 | offset = pt->read_end - pt->read_pos; | |
919 | pt->read_buf = pt->saved_read_buf; | |
920 | pt->read_pos = pt->saved_read_pos; | |
921 | pt->read_end = pt->saved_read_end; | |
922 | pt->read_buf_size = pt->saved_read_buf_size; | |
923 | } | |
924 | else | |
925 | offset = 0; | |
926 | ||
affc96b5 | 927 | scm_ptobs[SCM_PTOBNUM (port)].end_input (port, offset); |
283a1a0e GH |
928 | } |
929 | ||
ee149d03 JB |
930 | \f |
931 | ||
932 | ||
933 | void | |
a284e297 | 934 | scm_ungetc (int c, SCM port) |
ee149d03 | 935 | { |
840ae05d JB |
936 | scm_port *pt = SCM_PTAB_ENTRY (port); |
937 | ||
6c951427 GH |
938 | if (pt->read_buf == pt->putback_buf) |
939 | /* already using the put-back buffer. */ | |
940 | { | |
941 | /* enlarge putback_buf if necessary. */ | |
942 | if (pt->read_end == pt->read_buf + pt->read_buf_size | |
943 | && pt->read_buf == pt->read_pos) | |
944 | { | |
945 | int new_size = pt->read_buf_size * 2; | |
946 | unsigned char *tmp = | |
947 | (unsigned char *) realloc (pt->putback_buf, new_size); | |
948 | ||
949 | if (tmp == NULL) | |
950 | scm_memory_error ("scm_ungetc"); | |
951 | pt->read_pos = pt->read_buf = pt->putback_buf = tmp; | |
952 | pt->read_end = pt->read_buf + pt->read_buf_size; | |
953 | pt->read_buf_size = pt->putback_buf_size = new_size; | |
954 | } | |
955 | ||
956 | /* shift any existing bytes to buffer + 1. */ | |
957 | if (pt->read_pos == pt->read_end) | |
958 | pt->read_end = pt->read_buf + 1; | |
959 | else if (pt->read_pos != pt->read_buf + 1) | |
960 | { | |
961 | int count = pt->read_end - pt->read_pos; | |
962 | ||
963 | memmove (pt->read_buf + 1, pt->read_pos, count); | |
964 | pt->read_end = pt->read_buf + 1 + count; | |
965 | } | |
966 | ||
967 | pt->read_pos = pt->read_buf; | |
968 | } | |
969 | else | |
970 | /* switch to the put-back buffer. */ | |
971 | { | |
972 | if (pt->putback_buf == NULL) | |
973 | { | |
c357d546 MD |
974 | pt->putback_buf |
975 | = (unsigned char *) malloc (SCM_INITIAL_PUTBACK_BUF_SIZE); | |
6c951427 GH |
976 | if (pt->putback_buf == NULL) |
977 | scm_memory_error ("scm_ungetc"); | |
978 | pt->putback_buf_size = SCM_INITIAL_PUTBACK_BUF_SIZE; | |
979 | } | |
980 | ||
981 | pt->saved_read_buf = pt->read_buf; | |
982 | pt->saved_read_pos = pt->read_pos; | |
983 | pt->saved_read_end = pt->read_end; | |
984 | pt->saved_read_buf_size = pt->read_buf_size; | |
985 | ||
986 | pt->read_pos = pt->read_buf = pt->putback_buf; | |
987 | pt->read_end = pt->read_buf + 1; | |
988 | pt->read_buf_size = pt->putback_buf_size; | |
989 | } | |
990 | ||
991 | *pt->read_buf = c; | |
ee149d03 | 992 | |
840ae05d JB |
993 | if (pt->rw_random) |
994 | pt->rw_active = SCM_PORT_READ; | |
995 | ||
ee149d03 JB |
996 | if (c == '\n') |
997 | { | |
998 | /* What should col be in this case? | |
999 | * We'll leave it at -1. | |
1000 | */ | |
1001 | SCM_LINUM (port) -= 1; | |
1002 | } | |
1003 | else | |
1004 | SCM_COL(port) -= 1; | |
1005 | } | |
1006 | ||
1007 | ||
1008 | void | |
70d63753 | 1009 | scm_ungets (const char *s, int n, SCM port) |
ee149d03 JB |
1010 | { |
1011 | /* This is simple minded and inefficient, but unreading strings is | |
1012 | * probably not a common operation, and remember that line and | |
1013 | * column numbers have to be handled... | |
1014 | * | |
1015 | * Please feel free to write an optimized version! | |
1016 | */ | |
1017 | while (n--) | |
1018 | scm_ungetc (s[n], port); | |
1019 | } | |
1020 | ||
1021 | ||
3b3b36dd | 1022 | SCM_DEFINE (scm_peek_char, "peek-char", 0, 1, 0, |
1bbd0b84 | 1023 | (SCM port), |
bfc46627 GB |
1024 | "Returns the next character available from @var{port},\n" |
1025 | "@emph{without} updating @var{port} to point to the following\n" | |
1026 | "character. If no more characters are available, an end-of-file object\n" | |
1027 | "is returned.@footnote{The value returned by a call to @code{peek-char}\n" | |
1028 | "is the same as the value that would have been returned by a call to\n" | |
1029 | "@code{read-char} on the same port. The only difference is that the very\n" | |
1030 | "next call to @code{read-char} or @code{peek-char} on that\n" | |
1031 | "@var{port} will return the value returned by the preceding call to\n" | |
1032 | "@code{peek-char}. In particular, a call to @code{peek-char} on an\n" | |
1033 | "interactive port will hang waiting for input whenever a call to\n" | |
1034 | "@code{read-char} would have hung.}") | |
1bbd0b84 | 1035 | #define FUNC_NAME s_scm_peek_char |
ee149d03 JB |
1036 | { |
1037 | int c; | |
1038 | if (SCM_UNBNDP (port)) | |
1039 | port = scm_cur_inp; | |
1040 | else | |
3b3b36dd | 1041 | SCM_VALIDATE_OPINPORT (1,port); |
ee149d03 JB |
1042 | c = scm_getc (port); |
1043 | if (EOF == c) | |
1044 | return SCM_EOF_VAL; | |
1045 | scm_ungetc (c, port); | |
7866a09b | 1046 | return SCM_MAKE_CHAR (c); |
3cb988bd | 1047 | } |
1bbd0b84 | 1048 | #undef FUNC_NAME |
3cb988bd | 1049 | |
a1ec6916 | 1050 | SCM_DEFINE (scm_unread_char, "unread-char", 2, 0, 0, |
1bbd0b84 | 1051 | (SCM cobj, SCM port), |
b380b885 MD |
1052 | "Place @var{char} in @var{port} so that it will be read by the\n" |
1053 | "next read operation. If called multiple times, the unread characters\n" | |
1054 | "will be read again in last-in first-out order. If @var{port} is\n" | |
1055 | "not supplied, the current input port is used.") | |
1bbd0b84 | 1056 | #define FUNC_NAME s_scm_unread_char |
0f2d19dd JB |
1057 | { |
1058 | int c; | |
1059 | ||
7866a09b | 1060 | SCM_VALIDATE_CHAR (1,cobj); |
0f2d19dd JB |
1061 | if (SCM_UNBNDP (port)) |
1062 | port = scm_cur_inp; | |
1063 | else | |
3b3b36dd | 1064 | SCM_VALIDATE_OPINPORT (2,port); |
0f2d19dd | 1065 | |
7866a09b | 1066 | c = SCM_CHAR (cobj); |
0f2d19dd | 1067 | |
b7f3516f | 1068 | scm_ungetc (c, port); |
0f2d19dd JB |
1069 | return cobj; |
1070 | } | |
1bbd0b84 | 1071 | #undef FUNC_NAME |
0f2d19dd | 1072 | |
a1ec6916 | 1073 | SCM_DEFINE (scm_unread_string, "unread-string", 2, 0, 0, |
1bbd0b84 | 1074 | (SCM str, SCM port), |
b380b885 MD |
1075 | "Place the string @var{str} in @var{port} so that its characters will be\n" |
1076 | "read in subsequent read operations. If called multiple times, the\n" | |
1077 | "unread characters will be read again in last-in first-out order. If\n" | |
1078 | "@var{port} is not supplied, the current-input-port is used.") | |
1bbd0b84 | 1079 | #define FUNC_NAME s_scm_unread_string |
ee1e7e13 | 1080 | { |
3b3b36dd | 1081 | SCM_VALIDATE_STRING (1,str); |
ee1e7e13 MD |
1082 | if (SCM_UNBNDP (port)) |
1083 | port = scm_cur_inp; | |
1084 | else | |
3b3b36dd | 1085 | SCM_VALIDATE_OPINPORT (2,port); |
ee1e7e13 | 1086 | |
bfa974f0 | 1087 | scm_ungets (SCM_ROCHARS (str), SCM_STRING_LENGTH (str), port); |
ee1e7e13 MD |
1088 | |
1089 | return str; | |
1090 | } | |
1bbd0b84 | 1091 | #undef FUNC_NAME |
ee1e7e13 | 1092 | |
a1ec6916 | 1093 | SCM_DEFINE (scm_seek, "seek", 3, 0, 0, |
1bbd0b84 | 1094 | (SCM object, SCM offset, SCM whence), |
b380b885 MD |
1095 | "Sets the current position of @var{fd/port} to the integer @var{offset},\n" |
1096 | "which is interpreted according to the value of @var{whence}.\n\n" | |
1097 | "One of the following variables should be supplied\n" | |
1098 | "for @var{whence}:\n" | |
1099 | "@defvar SEEK_SET\n" | |
1100 | "Seek from the beginning of the file.\n" | |
1101 | "@end defvar\n" | |
1102 | "@defvar SEEK_CUR\n" | |
1103 | "Seek from the current position.\n" | |
1104 | "@end defvar\n" | |
1105 | "@defvar SEEK_END\n" | |
1106 | "Seek from the end of the file.\n" | |
1107 | "@end defvar\n\n" | |
1108 | "If @var{fd/port} is a file descriptor, the underlying system call is\n" | |
1109 | "@code{lseek}. @var{port} may be a string port.\n\n" | |
1110 | "The value returned is the new position in the file. This means that\n" | |
1111 | "the current position of a port can be obtained using:\n" | |
1112 | "@smalllisp\n" | |
1113 | "(seek port 0 SEEK_CUR)\n" | |
1114 | "@end smalllisp") | |
1bbd0b84 | 1115 | #define FUNC_NAME s_scm_seek |
840ae05d JB |
1116 | { |
1117 | off_t off; | |
1118 | off_t rv; | |
1119 | int how; | |
1120 | ||
1121 | object = SCM_COERCE_OUTPORT (object); | |
1122 | ||
1bbd0b84 | 1123 | off = SCM_NUM2LONG (2,offset); |
3b3b36dd | 1124 | SCM_VALIDATE_INUM_COPY (3,whence,how); |
840ae05d | 1125 | if (how != SEEK_SET && how != SEEK_CUR && how != SEEK_END) |
1bbd0b84 | 1126 | SCM_OUT_OF_RANGE (3, whence); |
0c95b57d | 1127 | if (SCM_OPPORTP (object)) |
840ae05d | 1128 | { |
f12733c9 | 1129 | scm_ptob_descriptor *ptob = scm_ptobs + SCM_PTOBNUM (object); |
840ae05d JB |
1130 | |
1131 | if (!ptob->seek) | |
1bbd0b84 GB |
1132 | SCM_MISC_ERROR ("port is not seekable", |
1133 | scm_cons (object, SCM_EOL)); | |
840ae05d | 1134 | else |
7dcb364d | 1135 | rv = ptob->seek (object, off, how); |
840ae05d JB |
1136 | } |
1137 | else /* file descriptor?. */ | |
1138 | { | |
3b3b36dd | 1139 | SCM_VALIDATE_INUM (1,object); |
840ae05d JB |
1140 | rv = lseek (SCM_INUM (object), off, how); |
1141 | if (rv == -1) | |
1bbd0b84 | 1142 | SCM_SYSERROR; |
840ae05d JB |
1143 | } |
1144 | return scm_long2num (rv); | |
1145 | } | |
1bbd0b84 | 1146 | #undef FUNC_NAME |
840ae05d | 1147 | |
a1ec6916 | 1148 | SCM_DEFINE (scm_truncate_file, "truncate-file", 1, 1, 0, |
1bbd0b84 | 1149 | (SCM object, SCM length), |
b380b885 MD |
1150 | "Truncates the object referred to by @var{obj} to at most @var{size} bytes.\n" |
1151 | "@var{obj} can be a string containing a file name or an integer file\n" | |
1152 | "descriptor or a port. @var{size} may be omitted if @var{obj} is not\n" | |
1153 | "a file name, in which case the truncation occurs at the current port.\n" | |
1154 | "position.\n\n" | |
1155 | "The return value is unspecified.") | |
1bbd0b84 | 1156 | #define FUNC_NAME s_scm_truncate_file |
840ae05d | 1157 | { |
69bc9ff3 GH |
1158 | int rv; |
1159 | off_t c_length; | |
1160 | ||
1161 | /* object can be a port, fdes or filename. */ | |
840ae05d | 1162 | |
840ae05d JB |
1163 | if (SCM_UNBNDP (length)) |
1164 | { | |
69bc9ff3 | 1165 | /* must supply length if object is a filename. */ |
0c95b57d | 1166 | if (SCM_ROSTRINGP (object)) |
c1bfcf60 | 1167 | SCM_MISC_ERROR("must supply length if OBJECT is a filename",SCM_EOL); |
69bc9ff3 | 1168 | |
c94577b4 | 1169 | length = scm_seek (object, SCM_INUM0, SCM_MAKINUM (SEEK_CUR)); |
840ae05d | 1170 | } |
1bbd0b84 | 1171 | c_length = SCM_NUM2LONG (2,length); |
69bc9ff3 | 1172 | if (c_length < 0) |
1bbd0b84 | 1173 | SCM_MISC_ERROR ("negative offset", SCM_EOL); |
3fe6190f | 1174 | |
69bc9ff3 GH |
1175 | object = SCM_COERCE_OUTPORT (object); |
1176 | if (SCM_INUMP (object)) | |
1177 | { | |
1178 | SCM_SYSCALL (rv = ftruncate (SCM_INUM (object), c_length)); | |
1179 | } | |
0c95b57d | 1180 | else if (SCM_OPOUTPORTP (object)) |
69bc9ff3 GH |
1181 | { |
1182 | scm_port *pt = SCM_PTAB_ENTRY (object); | |
f12733c9 | 1183 | scm_ptob_descriptor *ptob = scm_ptobs + SCM_PTOBNUM (object); |
69bc9ff3 | 1184 | |
affc96b5 | 1185 | if (!ptob->truncate) |
1bbd0b84 | 1186 | SCM_MISC_ERROR ("port is not truncatable", SCM_EOL); |
69bc9ff3 | 1187 | if (pt->rw_active == SCM_PORT_READ) |
affc96b5 | 1188 | scm_end_input (object); |
69bc9ff3 | 1189 | else if (pt->rw_active == SCM_PORT_WRITE) |
affc96b5 | 1190 | ptob->flush (object); |
69bc9ff3 | 1191 | |
affc96b5 | 1192 | ptob->truncate (object, c_length); |
69bc9ff3 GH |
1193 | rv = 0; |
1194 | } | |
1195 | else | |
1196 | { | |
3b3b36dd | 1197 | SCM_VALIDATE_ROSTRING (1,object); |
69bc9ff3 GH |
1198 | SCM_COERCE_SUBSTR (object); |
1199 | SCM_SYSCALL (rv = truncate (SCM_ROCHARS (object), c_length)); | |
1200 | } | |
1201 | if (rv == -1) | |
1bbd0b84 | 1202 | SCM_SYSERROR; |
840ae05d JB |
1203 | return SCM_UNSPECIFIED; |
1204 | } | |
1bbd0b84 | 1205 | #undef FUNC_NAME |
840ae05d | 1206 | |
a1ec6916 | 1207 | SCM_DEFINE (scm_port_line, "port-line", 1, 0, 0, |
1bbd0b84 | 1208 | (SCM port), |
b450f070 | 1209 | "Return the current line number for PORT.") |
1bbd0b84 | 1210 | #define FUNC_NAME s_scm_port_line |
0f2d19dd | 1211 | { |
78446828 | 1212 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd | 1213 | SCM_VALIDATE_OPENPORT (1,port); |
360fc44c | 1214 | return SCM_MAKINUM (SCM_LINUM (port)); |
0f2d19dd | 1215 | } |
1bbd0b84 | 1216 | #undef FUNC_NAME |
0f2d19dd | 1217 | |
a1ec6916 | 1218 | SCM_DEFINE (scm_set_port_line_x, "set-port-line!", 2, 0, 0, |
1bbd0b84 | 1219 | (SCM port, SCM line), |
b450f070 | 1220 | "Set the current line number for PORT to LINE.") |
1bbd0b84 | 1221 | #define FUNC_NAME s_scm_set_port_line_x |
d043d8c2 | 1222 | { |
360fc44c | 1223 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd GB |
1224 | SCM_VALIDATE_OPENPORT (1,port); |
1225 | SCM_VALIDATE_INUM (2,line); | |
564478fd GB |
1226 | SCM_PTAB_ENTRY (port)->line_number = SCM_INUM (line); |
1227 | return SCM_UNSPECIFIED; | |
d043d8c2 | 1228 | } |
1bbd0b84 | 1229 | #undef FUNC_NAME |
d043d8c2 | 1230 | |
a1ec6916 | 1231 | SCM_DEFINE (scm_port_column, "port-column", 1, 0, 0, |
1bbd0b84 | 1232 | (SCM port), |
b380b885 MD |
1233 | "@deffnx primitive port-line [input-port]\n" |
1234 | "Return the current column number or line number of @var{input-port},\n" | |
1235 | "using the current input port if none is specified. If the number is\n" | |
1236 | "unknown, the result is #f. Otherwise, the result is a 0-origin integer\n" | |
1237 | "- i.e. the first character of the first line is line 0, column 0.\n" | |
1238 | "(However, when you display a file position, for example in an error\n" | |
1239 | "message, we recommand you add 1 to get 1-origin integers. This is\n" | |
1240 | "because lines and column numbers traditionally start with 1, and that is\n" | |
1241 | "what non-programmers will find most natural.)") | |
1bbd0b84 | 1242 | #define FUNC_NAME s_scm_port_column |
0f2d19dd | 1243 | { |
78446828 | 1244 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd | 1245 | SCM_VALIDATE_OPENPORT (1,port); |
360fc44c | 1246 | return SCM_MAKINUM (SCM_COL (port)); |
0f2d19dd | 1247 | } |
1bbd0b84 | 1248 | #undef FUNC_NAME |
0f2d19dd | 1249 | |
a1ec6916 | 1250 | SCM_DEFINE (scm_set_port_column_x, "set-port-column!", 2, 0, 0, |
1bbd0b84 | 1251 | (SCM port, SCM column), |
92ccc1f1 NJ |
1252 | "@deffnx primitive set-port-line! port line\n" |
1253 | "Set the current column or line number of @var{port}, using the\n" | |
b380b885 | 1254 | "current input port if none is specified.") |
1bbd0b84 | 1255 | #define FUNC_NAME s_scm_set_port_column_x |
d043d8c2 | 1256 | { |
360fc44c | 1257 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd GB |
1258 | SCM_VALIDATE_OPENPORT (1,port); |
1259 | SCM_VALIDATE_INUM (2,column); | |
564478fd GB |
1260 | SCM_PTAB_ENTRY (port)->column_number = SCM_INUM (column); |
1261 | return SCM_UNSPECIFIED; | |
d043d8c2 | 1262 | } |
1bbd0b84 | 1263 | #undef FUNC_NAME |
d043d8c2 | 1264 | |
a1ec6916 | 1265 | SCM_DEFINE (scm_port_filename, "port-filename", 1, 0, 0, |
1bbd0b84 | 1266 | (SCM port), |
b380b885 | 1267 | "Return the filename associated with @var{port}. This function returns\n" |
2a2a730b | 1268 | "the strings \"standard input\", \"standard output\" and \"standard error\"\n" |
a3c8b9fc | 1269 | "when called on the current input, output and error ports respectively.") |
1bbd0b84 | 1270 | #define FUNC_NAME s_scm_port_filename |
0f2d19dd | 1271 | { |
78446828 | 1272 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd | 1273 | SCM_VALIDATE_OPENPORT (1,port); |
360fc44c | 1274 | return SCM_PTAB_ENTRY (port)->file_name; |
0f2d19dd | 1275 | } |
1bbd0b84 | 1276 | #undef FUNC_NAME |
0f2d19dd | 1277 | |
a1ec6916 | 1278 | SCM_DEFINE (scm_set_port_filename_x, "set-port-filename!", 2, 0, 0, |
1bbd0b84 | 1279 | (SCM port, SCM filename), |
b380b885 MD |
1280 | "Change the filename associated with @var{port}, using the current input\n" |
1281 | "port if none is specified. Note that this does not change the port's\n" | |
1282 | "source of data, but only the value that is returned by\n" | |
1283 | "@code{port-filename} and reported in diagnostic output.") | |
1bbd0b84 | 1284 | #define FUNC_NAME s_scm_set_port_filename_x |
d14af9f2 | 1285 | { |
360fc44c | 1286 | port = SCM_COERCE_OUTPORT (port); |
3b3b36dd | 1287 | SCM_VALIDATE_OPENPORT (1,port); |
360fc44c | 1288 | /* We allow the user to set the filename to whatever he likes. */ |
d14af9f2 MD |
1289 | return SCM_PTAB_ENTRY (port)->file_name = filename; |
1290 | } | |
1bbd0b84 | 1291 | #undef FUNC_NAME |
d14af9f2 | 1292 | |
0f2d19dd JB |
1293 | #ifndef ttyname |
1294 | extern char * ttyname(); | |
1295 | #endif | |
1296 | ||
f12733c9 MD |
1297 | void |
1298 | scm_print_port_mode (SCM exp, SCM port) | |
1299 | { | |
1300 | scm_puts (SCM_CLOSEDP (exp) | |
1301 | ? "closed: " | |
f9a64404 DH |
1302 | : (SCM_RDNG & SCM_CELL_WORD_0 (exp) |
1303 | ? (SCM_WRTNG & SCM_CELL_WORD_0 (exp) | |
f12733c9 MD |
1304 | ? "input-output: " |
1305 | : "input: ") | |
f9a64404 | 1306 | : (SCM_WRTNG & SCM_CELL_WORD_0 (exp) |
f12733c9 MD |
1307 | ? "output: " |
1308 | : "bogus: ")), | |
1309 | port); | |
1310 | } | |
1cc91f1b | 1311 | |
f12733c9 MD |
1312 | int |
1313 | scm_port_print (SCM exp, SCM port, scm_print_state *pstate) | |
0f2d19dd | 1314 | { |
f12733c9 MD |
1315 | char *type = SCM_PTOBNAME (SCM_PTOBNUM (exp)); |
1316 | if (!type) | |
1317 | type = "port"; | |
b7f3516f | 1318 | scm_puts ("#<", port); |
f12733c9 | 1319 | scm_print_port_mode (exp, port); |
b7f3516f TT |
1320 | scm_puts (type, port); |
1321 | scm_putc (' ', port); | |
12a8b769 | 1322 | scm_intprint (SCM_CELL_WORD_1 (exp), 16, port); |
b7f3516f | 1323 | scm_putc ('>', port); |
f12733c9 | 1324 | return 1; |
0f2d19dd JB |
1325 | } |
1326 | ||
f12733c9 MD |
1327 | extern void scm_make_fptob (); |
1328 | extern void scm_make_stptob (); | |
1329 | extern void scm_make_sfptob (); | |
1cc91f1b | 1330 | |
0f2d19dd JB |
1331 | void |
1332 | scm_ports_prehistory () | |
0f2d19dd JB |
1333 | { |
1334 | scm_numptob = 0; | |
f12733c9 | 1335 | scm_ptobs = (scm_ptob_descriptor *) malloc (sizeof (scm_ptob_descriptor)); |
0f2d19dd JB |
1336 | |
1337 | /* WARNING: These scm_newptob calls must be done in this order. | |
1338 | * They must agree with the port declarations in tags.h. | |
1339 | */ | |
f12733c9 MD |
1340 | /* scm_tc16_fport = */ scm_make_fptob (); |
1341 | /* scm_tc16_pipe was here */ scm_make_fptob (); /* dummy. */ | |
1342 | /* scm_tc16_strport = */ scm_make_stptob (); | |
1343 | /* scm_tc16_sfport = */ scm_make_sfptob (); | |
0f2d19dd | 1344 | } |
0f2d19dd JB |
1345 | |
1346 | \f | |
ee149d03 | 1347 | |
d68fee48 | 1348 | /* Void ports. */ |
0f2d19dd | 1349 | |
f12733c9 | 1350 | long scm_tc16_void_port = 0; |
0f2d19dd | 1351 | |
70df8af6 | 1352 | static int fill_input_void_port (SCM port) |
283a1a0e | 1353 | { |
70df8af6 | 1354 | return EOF; |
283a1a0e GH |
1355 | } |
1356 | ||
31703ab8 | 1357 | static void |
8aa011a1 | 1358 | write_void_port (SCM port, const void *data, size_t size) |
31703ab8 GH |
1359 | { |
1360 | } | |
1361 | ||
0f2d19dd | 1362 | SCM |
a284e297 | 1363 | scm_void_port (char *mode_str) |
0f2d19dd JB |
1364 | { |
1365 | int mode_bits; | |
1366 | SCM answer; | |
840ae05d | 1367 | scm_port * pt; |
0f2d19dd JB |
1368 | |
1369 | SCM_NEWCELL (answer); | |
1370 | SCM_DEFER_INTS; | |
1371 | mode_bits = scm_mode_bits (mode_str); | |
1372 | pt = scm_add_to_port_table (answer); | |
70df8af6 | 1373 | scm_port_non_buffer (pt); |
0f2d19dd | 1374 | SCM_SETPTAB_ENTRY (answer, pt); |
ee149d03 | 1375 | SCM_SETSTREAM (answer, 0); |
54778cd3 | 1376 | SCM_SET_CELL_TYPE (answer, scm_tc16_void_port | mode_bits); |
0f2d19dd JB |
1377 | SCM_ALLOW_INTS; |
1378 | return answer; | |
1379 | } | |
1380 | ||
a1ec6916 | 1381 | SCM_DEFINE (scm_sys_make_void_port, "%make-void-port", 1, 0, 0, |
1bbd0b84 | 1382 | (SCM mode), |
70df8af6 GH |
1383 | "Create and return a new void port. A void port acts like\n" |
1384 | "/dev/null. The @var{mode} argument\n" | |
1385 | "specifies the input/output modes for this port: see the\n" | |
b380b885 | 1386 | "documentation for @code{open-file} in @ref{File Ports}.") |
1bbd0b84 | 1387 | #define FUNC_NAME s_scm_sys_make_void_port |
0f2d19dd | 1388 | { |
3b3b36dd | 1389 | SCM_VALIDATE_ROSTRING (1,mode); |
89958ad0 | 1390 | SCM_COERCE_SUBSTR (mode); |
0f2d19dd JB |
1391 | return scm_void_port (SCM_ROCHARS (mode)); |
1392 | } | |
1bbd0b84 | 1393 | #undef FUNC_NAME |
0f2d19dd | 1394 | |
0f2d19dd | 1395 | \f |
89545eba | 1396 | /* Initialization. */ |
1cc91f1b | 1397 | |
0f2d19dd JB |
1398 | void |
1399 | scm_init_ports () | |
0f2d19dd | 1400 | { |
840ae05d JB |
1401 | /* lseek() symbols. */ |
1402 | scm_sysintern ("SEEK_SET", SCM_MAKINUM (SEEK_SET)); | |
1403 | scm_sysintern ("SEEK_CUR", SCM_MAKINUM (SEEK_CUR)); | |
1404 | scm_sysintern ("SEEK_END", SCM_MAKINUM (SEEK_END)); | |
1405 | ||
70df8af6 GH |
1406 | scm_tc16_void_port = scm_make_port_type ("void", fill_input_void_port, |
1407 | write_void_port); | |
a0599745 | 1408 | #include "libguile/ports.x" |
0f2d19dd | 1409 | } |
89e00824 ML |
1410 | |
1411 | /* | |
1412 | Local Variables: | |
1413 | c-file-style: "gnu" | |
1414 | End: | |
1415 | */ |