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be54b15d | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001 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 | 41 | |
1bbd0b84 | 42 | |
0f2d19dd | 43 | \f |
d68fee48 JB |
44 | /* Headers. */ |
45 | ||
bd515f37 RB |
46 | #if HAVE_CONFIG_H |
47 | # include <config.h> | |
48 | #endif | |
49 | ||
0f2d19dd | 50 | #include <stdio.h> |
e6e2e95a MD |
51 | #include <errno.h> |
52 | ||
a0599745 | 53 | #include "libguile/_scm.h" |
f0942910 | 54 | #include "libguile/eval.h" |
a0599745 MD |
55 | #include "libguile/objects.h" |
56 | #include "libguile/smob.h" | |
57 | #include "libguile/chars.h" | |
0f2d19dd | 58 | |
a0599745 MD |
59 | #include "libguile/keywords.h" |
60 | #include "libguile/root.h" | |
61 | #include "libguile/strings.h" | |
20e6290e | 62 | |
a0599745 MD |
63 | #include "libguile/validate.h" |
64 | #include "libguile/ports.h" | |
0f2d19dd | 65 | |
bd9e24b3 GH |
66 | #ifdef HAVE_STRING_H |
67 | #include <string.h> | |
68 | #endif | |
69 | ||
0f2d19dd | 70 | #ifdef HAVE_MALLOC_H |
95b88819 | 71 | #include <malloc.h> |
0f2d19dd JB |
72 | #endif |
73 | ||
ec65f5da MV |
74 | #ifdef HAVE_IO_H |
75 | #include <io.h> | |
76 | #endif | |
77 | ||
0f2d19dd JB |
78 | #ifdef HAVE_UNISTD_H |
79 | #include <unistd.h> | |
80 | #endif | |
81 | ||
95b88819 GH |
82 | #ifdef HAVE_SYS_IOCTL_H |
83 | #include <sys/ioctl.h> | |
84 | #endif | |
d68fee48 | 85 | |
82893676 MG |
86 | #ifdef __MINGW32__ |
87 | #include <fcntl.h> | |
88 | #define ftruncate(fd, size) chsize (fd, size) | |
89 | #endif | |
90 | ||
0f2d19dd | 91 | \f |
d68fee48 | 92 | /* The port kind table --- a dynamically resized array of port types. */ |
0f2d19dd JB |
93 | |
94 | ||
95 | /* scm_ptobs scm_numptob | |
96 | * implement a dynamicly resized array of ptob records. | |
97 | * Indexes into this table are used when generating type | |
98 | * tags for smobjects (if you know a tag you can get an index and conversely). | |
99 | */ | |
92c2555f | 100 | scm_t_ptob_descriptor *scm_ptobs; |
c014a02e | 101 | long scm_numptob; |
0f2d19dd | 102 | |
ee149d03 | 103 | /* GC marker for a port with stream of SCM type. */ |
0f2d19dd | 104 | SCM |
a284e297 | 105 | scm_markstream (SCM ptr) |
0f2d19dd JB |
106 | { |
107 | int openp; | |
f9a64404 | 108 | openp = SCM_CELL_WORD_0 (ptr) & SCM_OPN; |
0f2d19dd | 109 | if (openp) |
74a16888 | 110 | return SCM_PACK (SCM_STREAM (ptr)); |
0f2d19dd JB |
111 | else |
112 | return SCM_BOOL_F; | |
113 | } | |
114 | ||
f12733c9 | 115 | /* |
f12733c9 | 116 | * We choose to use an interface similar to the smob interface with |
affc96b5 | 117 | * fill_input and write as standard fields, passed to the port |
f12733c9 MD |
118 | * type constructor, and optional fields set by setters. |
119 | */ | |
120 | ||
70df8af6 | 121 | static void |
e81d98ec | 122 | flush_port_default (SCM port SCM_UNUSED) |
70df8af6 GH |
123 | { |
124 | } | |
125 | ||
126 | static void | |
e81d98ec | 127 | end_input_default (SCM port SCM_UNUSED, int offset SCM_UNUSED) |
70df8af6 GH |
128 | { |
129 | } | |
0f2d19dd | 130 | |
4c9419ac MV |
131 | static size_t |
132 | scm_port_free0 (SCM port) | |
133 | { | |
134 | return 0; | |
135 | } | |
136 | ||
92c2555f | 137 | scm_t_bits |
f12733c9 | 138 | scm_make_port_type (char *name, |
affc96b5 | 139 | int (*fill_input) (SCM port), |
8aa011a1 | 140 | void (*write) (SCM port, const void *data, size_t size)) |
0f2d19dd JB |
141 | { |
142 | char *tmp; | |
143 | if (255 <= scm_numptob) | |
144 | goto ptoberr; | |
f12733c9 MD |
145 | SCM_DEFER_INTS; |
146 | SCM_SYSCALL (tmp = (char *) realloc ((char *) scm_ptobs, | |
147 | (1 + scm_numptob) | |
92c2555f | 148 | * sizeof (scm_t_ptob_descriptor))); |
0f2d19dd JB |
149 | if (tmp) |
150 | { | |
92c2555f | 151 | scm_ptobs = (scm_t_ptob_descriptor *) tmp; |
affc96b5 | 152 | |
f12733c9 MD |
153 | scm_ptobs[scm_numptob].name = name; |
154 | scm_ptobs[scm_numptob].mark = 0; | |
4c9419ac | 155 | scm_ptobs[scm_numptob].free = scm_port_free0; |
f12733c9 MD |
156 | scm_ptobs[scm_numptob].print = scm_port_print; |
157 | scm_ptobs[scm_numptob].equalp = 0; | |
affc96b5 GH |
158 | scm_ptobs[scm_numptob].close = 0; |
159 | ||
160 | scm_ptobs[scm_numptob].write = write; | |
70df8af6 | 161 | scm_ptobs[scm_numptob].flush = flush_port_default; |
affc96b5 | 162 | |
70df8af6 | 163 | scm_ptobs[scm_numptob].end_input = end_input_default; |
affc96b5 GH |
164 | scm_ptobs[scm_numptob].fill_input = fill_input; |
165 | scm_ptobs[scm_numptob].input_waiting = 0; | |
166 | ||
f12733c9 | 167 | scm_ptobs[scm_numptob].seek = 0; |
affc96b5 GH |
168 | scm_ptobs[scm_numptob].truncate = 0; |
169 | ||
0f2d19dd JB |
170 | scm_numptob++; |
171 | } | |
f12733c9 | 172 | SCM_ALLOW_INTS; |
0f2d19dd | 173 | if (!tmp) |
2500356c DH |
174 | { |
175 | ptoberr: | |
176 | scm_memory_error ("scm_make_port_type"); | |
177 | } | |
f12733c9 MD |
178 | /* Make a class object if Goops is present */ |
179 | if (scm_port_class) | |
180 | scm_make_port_classes (scm_numptob - 1, SCM_PTOBNAME (scm_numptob - 1)); | |
0f2d19dd JB |
181 | return scm_tc7_port + (scm_numptob - 1) * 256; |
182 | } | |
183 | ||
f12733c9 | 184 | void |
6c747373 | 185 | scm_set_port_mark (long tc, SCM (*mark) (SCM)) |
f12733c9 MD |
186 | { |
187 | scm_ptobs[SCM_TC2PTOBNUM (tc)].mark = mark; | |
188 | } | |
189 | ||
190 | void | |
1be6b49c | 191 | scm_set_port_free (long tc, size_t (*free) (SCM)) |
f12733c9 MD |
192 | { |
193 | scm_ptobs[SCM_TC2PTOBNUM (tc)].free = free; | |
194 | } | |
195 | ||
196 | void | |
6c747373 | 197 | scm_set_port_print (long tc, int (*print) (SCM exp, SCM port, |
f12733c9 MD |
198 | scm_print_state *pstate)) |
199 | { | |
200 | scm_ptobs[SCM_TC2PTOBNUM (tc)].print = print; | |
201 | } | |
202 | ||
203 | void | |
6c747373 | 204 | scm_set_port_equalp (long tc, SCM (*equalp) (SCM, SCM)) |
f12733c9 MD |
205 | { |
206 | scm_ptobs[SCM_TC2PTOBNUM (tc)].equalp = equalp; | |
207 | } | |
208 | ||
31703ab8 | 209 | void |
affc96b5 | 210 | scm_set_port_flush (long tc, void (*flush) (SCM port)) |
31703ab8 | 211 | { |
affc96b5 | 212 | scm_ptobs[SCM_TC2PTOBNUM (tc)].flush = flush; |
31703ab8 GH |
213 | } |
214 | ||
f12733c9 | 215 | void |
affc96b5 | 216 | scm_set_port_end_input (long tc, void (*end_input) (SCM port, int offset)) |
f12733c9 | 217 | { |
affc96b5 | 218 | scm_ptobs[SCM_TC2PTOBNUM (tc)].end_input = end_input; |
f12733c9 MD |
219 | } |
220 | ||
221 | void | |
6c747373 | 222 | scm_set_port_close (long tc, int (*close) (SCM)) |
f12733c9 | 223 | { |
affc96b5 | 224 | scm_ptobs[SCM_TC2PTOBNUM (tc)].close = close; |
f12733c9 MD |
225 | } |
226 | ||
227 | void | |
6c747373 | 228 | scm_set_port_seek (long tc, off_t (*seek) (SCM port, |
f12733c9 MD |
229 | off_t OFFSET, |
230 | int WHENCE)) | |
231 | { | |
232 | scm_ptobs[SCM_TC2PTOBNUM (tc)].seek = seek; | |
233 | } | |
234 | ||
235 | void | |
6c747373 | 236 | scm_set_port_truncate (long tc, void (*truncate) (SCM port, off_t length)) |
f12733c9 | 237 | { |
affc96b5 | 238 | scm_ptobs[SCM_TC2PTOBNUM (tc)].truncate = truncate; |
f12733c9 MD |
239 | } |
240 | ||
241 | void | |
affc96b5 | 242 | scm_set_port_input_waiting (long tc, int (*input_waiting) (SCM)) |
f12733c9 | 243 | { |
affc96b5 | 244 | scm_ptobs[SCM_TC2PTOBNUM (tc)].input_waiting = input_waiting; |
f12733c9 MD |
245 | } |
246 | ||
0f2d19dd | 247 | \f |
0f2d19dd | 248 | |
3b3b36dd | 249 | SCM_DEFINE (scm_char_ready_p, "char-ready?", 0, 1, 0, |
1e6808ea MG |
250 | (SCM port), |
251 | "Return @code{#t} if a character is ready on input @var{port}\n" | |
252 | "and return @code{#f} otherwise. If @code{char-ready?} returns\n" | |
253 | "@code{#t} then the next @code{read-char} operation on\n" | |
254 | "@var{port} is guaranteed not to hang. If @var{port} is a file\n" | |
255 | "port at end of file then @code{char-ready?} returns @code{#t}.\n" | |
256 | "@footnote{@code{char-ready?} exists to make it possible for a\n" | |
257 | "program to accept characters from interactive ports without\n" | |
258 | "getting stuck waiting for input. Any input editors associated\n" | |
259 | "with such ports must make sure that characters whose existence\n" | |
260 | "has been asserted by @code{char-ready?} cannot be rubbed out.\n" | |
261 | "If @code{char-ready?} were to return @code{#f} at end of file,\n" | |
262 | "a port at end of file would be indistinguishable from an\n" | |
263 | "interactive port that has no ready characters.}") | |
1bbd0b84 | 264 | #define FUNC_NAME s_scm_char_ready_p |
0f2d19dd | 265 | { |
92c2555f | 266 | scm_t_port *pt; |
6c951427 | 267 | |
0f2d19dd JB |
268 | if (SCM_UNBNDP (port)) |
269 | port = scm_cur_inp; | |
270 | else | |
34d19ef6 | 271 | SCM_VALIDATE_OPINPORT (1, port); |
d68fee48 | 272 | |
ae4c4016 JB |
273 | pt = SCM_PTAB_ENTRY (port); |
274 | ||
6c951427 GH |
275 | /* if the current read buffer is filled, or the |
276 | last pushed-back char has been read and the saved buffer is | |
277 | filled, result is true. */ | |
278 | if (pt->read_pos < pt->read_end | |
279 | || (pt->read_buf == pt->putback_buf | |
280 | && pt->saved_read_pos < pt->saved_read_end)) | |
0f2d19dd | 281 | return SCM_BOOL_T; |
ee149d03 JB |
282 | else |
283 | { | |
92c2555f | 284 | scm_t_ptob_descriptor *ptob = &scm_ptobs[SCM_PTOBNUM (port)]; |
ee149d03 | 285 | |
affc96b5 | 286 | if (ptob->input_waiting) |
1bbd0b84 | 287 | return SCM_BOOL(ptob->input_waiting (port)); |
ee149d03 | 288 | else |
6c951427 | 289 | return SCM_BOOL_T; |
ee149d03 | 290 | } |
0f2d19dd | 291 | } |
1bbd0b84 | 292 | #undef FUNC_NAME |
0f2d19dd | 293 | |
c2da2648 GH |
294 | /* move up to read_len chars from port's putback and/or read buffers |
295 | into memory starting at dest. returns the number of chars moved. */ | |
296 | size_t scm_take_from_input_buffers (SCM port, char *dest, size_t read_len) | |
297 | { | |
92c2555f | 298 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
c2da2648 GH |
299 | size_t chars_read = 0; |
300 | size_t from_buf = min (pt->read_end - pt->read_pos, read_len); | |
301 | ||
302 | if (from_buf > 0) | |
303 | { | |
304 | memcpy (dest, pt->read_pos, from_buf); | |
305 | pt->read_pos += from_buf; | |
306 | chars_read += from_buf; | |
307 | read_len -= from_buf; | |
308 | dest += from_buf; | |
309 | } | |
310 | ||
311 | /* if putback was active, try the real input buffer too. */ | |
312 | if (pt->read_buf == pt->putback_buf) | |
313 | { | |
314 | from_buf = min (pt->saved_read_end - pt->saved_read_pos, read_len); | |
315 | if (from_buf > 0) | |
316 | { | |
317 | memcpy (dest, pt->saved_read_pos, from_buf); | |
318 | pt->saved_read_pos += from_buf; | |
319 | chars_read += from_buf; | |
320 | } | |
321 | } | |
322 | return chars_read; | |
323 | } | |
324 | ||
6c951427 | 325 | /* Clear a port's read buffers, returning the contents. */ |
a1ec6916 | 326 | SCM_DEFINE (scm_drain_input, "drain-input", 1, 0, 0, |
1bbd0b84 | 327 | (SCM port), |
4a151b3d GH |
328 | "This procedure clears a port's input buffers, similar\n" |
329 | "to the way that force-output clears the output buffer. The\n" | |
330 | "contents of the buffers are returned as a single string, e.g.,\n" | |
331 | "\n" | |
332 | "@lisp\n" | |
333 | "(define p (open-input-file ...))\n" | |
334 | "(drain-input p) => empty string, nothing buffered yet.\n" | |
335 | "(unread-char (read-char p) p)\n" | |
336 | "(drain-input p) => initial chars from p, up to the buffer size.\n" | |
337 | "@end lisp\n\n" | |
338 | "Draining the buffers may be useful for cleanly finishing\n" | |
339 | "buffered I/O so that the file descriptor can be used directly\n" | |
340 | "for further input.") | |
1bbd0b84 | 341 | #define FUNC_NAME s_scm_drain_input |
ee149d03 | 342 | { |
840ae05d | 343 | SCM result; |
92c2555f | 344 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
c014a02e | 345 | long count; |
ee149d03 | 346 | |
34d19ef6 | 347 | SCM_VALIDATE_OPINPORT (1, port); |
840ae05d | 348 | |
6c951427 GH |
349 | count = pt->read_end - pt->read_pos; |
350 | if (pt->read_buf == pt->putback_buf) | |
351 | count += pt->saved_read_end - pt->saved_read_pos; | |
840ae05d | 352 | |
be54b15d | 353 | result = scm_allocate_string (count); |
c2da2648 | 354 | scm_take_from_input_buffers (port, SCM_STRING_CHARS (result), count); |
6c951427 | 355 | |
840ae05d | 356 | return result; |
ee149d03 | 357 | } |
1bbd0b84 | 358 | #undef FUNC_NAME |
0f2d19dd JB |
359 | |
360 | \f | |
d68fee48 | 361 | /* Standard ports --- current input, output, error, and more(!). */ |
0f2d19dd | 362 | |
3b3b36dd | 363 | SCM_DEFINE (scm_current_input_port, "current-input-port", 0, 0, 0, |
e1546b65 MG |
364 | (), |
365 | "Return the current input port. This is the default port used\n" | |
366 | "by many input procedures. Initially, @code{current-input-port}\n" | |
367 | "returns the @dfn{standard input} in Unix and C terminology.") | |
1bbd0b84 | 368 | #define FUNC_NAME s_scm_current_input_port |
0f2d19dd JB |
369 | { |
370 | return scm_cur_inp; | |
371 | } | |
1bbd0b84 | 372 | #undef FUNC_NAME |
0f2d19dd | 373 | |
3b3b36dd | 374 | SCM_DEFINE (scm_current_output_port, "current-output-port", 0, 0, 0, |
e1546b65 MG |
375 | (), |
376 | "Return the current output port. This is the default port used\n" | |
9401323e | 377 | "by many output procedures. Initially,\n" |
e1546b65 MG |
378 | "@code{current-output-port} returns the @dfn{standard output} in\n" |
379 | "Unix and C terminology.") | |
1bbd0b84 | 380 | #define FUNC_NAME s_scm_current_output_port |
0f2d19dd JB |
381 | { |
382 | return scm_cur_outp; | |
383 | } | |
1bbd0b84 | 384 | #undef FUNC_NAME |
0f2d19dd | 385 | |
3b3b36dd | 386 | SCM_DEFINE (scm_current_error_port, "current-error-port", 0, 0, 0, |
1bbd0b84 | 387 | (), |
b380b885 MD |
388 | "Return the port to which errors and warnings should be sent (the\n" |
389 | "@dfn{standard error} in Unix and C terminology).") | |
1bbd0b84 | 390 | #define FUNC_NAME s_scm_current_error_port |
0f2d19dd JB |
391 | { |
392 | return scm_cur_errp; | |
393 | } | |
1bbd0b84 | 394 | #undef FUNC_NAME |
0f2d19dd | 395 | |
3b3b36dd | 396 | SCM_DEFINE (scm_current_load_port, "current-load-port", 0, 0, 0, |
e1546b65 | 397 | (), |
b450f070 | 398 | "Return the current-load-port.\n" |
e1546b65 | 399 | "The load port is used internally by @code{primitive-load}.") |
1bbd0b84 | 400 | #define FUNC_NAME s_scm_current_load_port |
31614d8e MD |
401 | { |
402 | return scm_cur_loadp; | |
403 | } | |
1bbd0b84 | 404 | #undef FUNC_NAME |
31614d8e | 405 | |
3b3b36dd | 406 | SCM_DEFINE (scm_set_current_input_port, "set-current-input-port", 1, 0, 0, |
1bbd0b84 | 407 | (SCM port), |
8f85c0c6 NJ |
408 | "@deffnx {Scheme Procedure} set-current-output-port port\n" |
409 | "@deffnx {Scheme Procedure} set-current-error-port port\n" | |
b380b885 MD |
410 | "Change the ports returned by @code{current-input-port},\n" |
411 | "@code{current-output-port} and @code{current-error-port}, respectively,\n" | |
412 | "so that they use the supplied @var{port} for input or output.") | |
1bbd0b84 | 413 | #define FUNC_NAME s_scm_set_current_input_port |
0f2d19dd JB |
414 | { |
415 | SCM oinp = scm_cur_inp; | |
34d19ef6 | 416 | SCM_VALIDATE_OPINPORT (1, port); |
0f2d19dd JB |
417 | scm_cur_inp = port; |
418 | return oinp; | |
419 | } | |
1bbd0b84 | 420 | #undef FUNC_NAME |
0f2d19dd JB |
421 | |
422 | ||
3b3b36dd | 423 | SCM_DEFINE (scm_set_current_output_port, "set-current-output-port", 1, 0, 0, |
e1546b65 MG |
424 | (SCM port), |
425 | "Set the current default output port to @var{port}.") | |
1bbd0b84 | 426 | #define FUNC_NAME s_scm_set_current_output_port |
0f2d19dd JB |
427 | { |
428 | SCM ooutp = scm_cur_outp; | |
78446828 | 429 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 430 | SCM_VALIDATE_OPOUTPORT (1, port); |
0f2d19dd JB |
431 | scm_cur_outp = port; |
432 | return ooutp; | |
433 | } | |
1bbd0b84 | 434 | #undef FUNC_NAME |
0f2d19dd JB |
435 | |
436 | ||
3b3b36dd | 437 | SCM_DEFINE (scm_set_current_error_port, "set-current-error-port", 1, 0, 0, |
e1546b65 MG |
438 | (SCM port), |
439 | "Set the current default error port to @var{port}.") | |
1bbd0b84 | 440 | #define FUNC_NAME s_scm_set_current_error_port |
0f2d19dd JB |
441 | { |
442 | SCM oerrp = scm_cur_errp; | |
78446828 | 443 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 444 | SCM_VALIDATE_OPOUTPORT (1, port); |
0f2d19dd JB |
445 | scm_cur_errp = port; |
446 | return oerrp; | |
447 | } | |
1bbd0b84 | 448 | #undef FUNC_NAME |
0f2d19dd JB |
449 | |
450 | \f | |
840ae05d | 451 | /* The port table --- an array of pointers to ports. */ |
0f2d19dd | 452 | |
67329a9e | 453 | scm_t_port **scm_i_port_table; |
0f2d19dd | 454 | |
67329a9e HWN |
455 | long scm_i_port_table_size = 0; /* Number of ports in scm_i_port_table. */ |
456 | long scm_i_port_table_room = 20; /* Size of the array. */ | |
0f2d19dd | 457 | |
1cc91f1b | 458 | |
da220f27 HWN |
459 | SCM |
460 | scm_new_port_table_entry (scm_t_bits tag) | |
402788a9 | 461 | #define FUNC_NAME "scm_new_port_table_entry" |
0f2d19dd | 462 | { |
85835e59 HWN |
463 | /* |
464 | We initialize the cell to empty, this is in case scm_gc_calloc | |
465 | triggers GC ; we don't want the GC to scan a half-finished Z. | |
466 | */ | |
467 | ||
67329a9e | 468 | SCM z = scm_cons (SCM_EOL, SCM_EOL); |
39e8f371 | 469 | scm_t_port *entry = (scm_t_port *) scm_gc_calloc (sizeof (scm_t_port), "port"); |
67329a9e | 470 | if (scm_i_port_table_size == scm_i_port_table_room) |
0f2d19dd | 471 | { |
4c9419ac | 472 | /* initial malloc is in gc.c. this doesn't use scm_gc_malloc etc., |
c6c79933 | 473 | since it can never be freed during gc. */ |
67329a9e | 474 | void *newt = scm_realloc ((char *) scm_i_port_table, |
4c9419ac | 475 | (size_t) (sizeof (scm_t_port *) |
67329a9e HWN |
476 | * scm_i_port_table_room * 2)); |
477 | scm_i_port_table = (scm_t_port **) newt; | |
478 | scm_i_port_table_room *= 2; | |
0f2d19dd | 479 | } |
840ae05d | 480 | |
67329a9e | 481 | entry->entry = scm_i_port_table_size; |
5f16b897 | 482 | |
840ae05d | 483 | entry->file_name = SCM_BOOL_F; |
61e452ba | 484 | entry->rw_active = SCM_PORT_NEITHER; |
5f16b897 | 485 | |
67329a9e HWN |
486 | scm_i_port_table[scm_i_port_table_size] = entry; |
487 | scm_i_port_table_size++; | |
840ae05d | 488 | |
da220f27 HWN |
489 | entry->port = z; |
490 | SCM_SET_CELL_TYPE(z, tag); | |
491 | SCM_SETPTAB_ENTRY(z, entry); | |
492 | ||
493 | return z; | |
0f2d19dd | 494 | } |
c6c79933 | 495 | #undef FUNC_NAME |
0f2d19dd | 496 | |
67329a9e HWN |
497 | #if SCM_ENABLE_DEPRECATED==1 |
498 | SCM_API scm_t_port * | |
499 | scm_add_to_port_table (SCM port) | |
500 | { | |
501 | SCM z = scm_new_port_table_entry (scm_tc7_port); | |
502 | scm_t_port * pt = SCM_PTAB_ENTRY(z); | |
503 | ||
504 | pt->port = port; | |
505 | SCM_SETCAR(z, SCM_EOL); | |
506 | SCM_SETCDR(z, SCM_EOL); | |
85835e59 | 507 | SCM_SETPTAB_ENTRY (port, pt); |
67329a9e HWN |
508 | return pt; |
509 | } | |
510 | #endif | |
511 | ||
512 | ||
6c951427 | 513 | /* Remove a port from the table and destroy it. */ |
0f2d19dd | 514 | void |
a284e297 | 515 | scm_remove_from_port_table (SCM port) |
db4b4ca6 | 516 | #define FUNC_NAME "scm_remove_from_port_table" |
0f2d19dd | 517 | { |
92c2555f | 518 | scm_t_port *p = SCM_PTAB_ENTRY (port); |
c014a02e | 519 | long i = p->entry; |
6c951427 | 520 | |
67329a9e | 521 | if (i >= scm_i_port_table_size) |
1afff620 | 522 | SCM_MISC_ERROR ("Port not in table: ~S", scm_list_1 (port)); |
6c951427 | 523 | if (p->putback_buf) |
4c9419ac MV |
524 | scm_gc_free (p->putback_buf, p->putback_buf_size, "putback buffer"); |
525 | scm_gc_free (p, sizeof (scm_t_port), "port"); | |
ee1e7e13 MD |
526 | /* Since we have just freed slot i we can shrink the table by moving |
527 | the last entry to that slot... */ | |
67329a9e | 528 | if (i < scm_i_port_table_size - 1) |
0f2d19dd | 529 | { |
67329a9e HWN |
530 | scm_i_port_table[i] = scm_i_port_table[scm_i_port_table_size - 1]; |
531 | scm_i_port_table[i]->entry = i; | |
0f2d19dd | 532 | } |
0f2d19dd | 533 | SCM_SETPTAB_ENTRY (port, 0); |
67329a9e | 534 | scm_i_port_table_size--; |
0f2d19dd | 535 | } |
db4b4ca6 DH |
536 | #undef FUNC_NAME |
537 | ||
0f2d19dd | 538 | |
fea6b4ea | 539 | #ifdef GUILE_DEBUG |
b450f070 | 540 | /* Functions for debugging. */ |
1cc91f1b | 541 | |
3b3b36dd | 542 | SCM_DEFINE (scm_pt_size, "pt-size", 0, 0, 0, |
b450f070 | 543 | (), |
1e6808ea | 544 | "Return the number of ports in the port table. @code{pt-size}\n" |
5352393c | 545 | "is only included in @code{--enable-guile-debug} builds.") |
1bbd0b84 | 546 | #define FUNC_NAME s_scm_pt_size |
0f2d19dd | 547 | { |
67329a9e | 548 | return SCM_MAKINUM (scm_i_port_table_size); |
0f2d19dd | 549 | } |
1bbd0b84 | 550 | #undef FUNC_NAME |
0f2d19dd | 551 | |
3b3b36dd | 552 | SCM_DEFINE (scm_pt_member, "pt-member", 1, 0, 0, |
b450f070 | 553 | (SCM index), |
1e6808ea | 554 | "Return the port at @var{index} in the port table.\n" |
5352393c MG |
555 | "@code{pt-member} is only included in\n" |
556 | "@code{--enable-guile-debug} builds.") | |
1bbd0b84 | 557 | #define FUNC_NAME s_scm_pt_member |
0f2d19dd | 558 | { |
c014a02e | 559 | long i; |
34d19ef6 | 560 | SCM_VALIDATE_INUM_COPY (1, index, i); |
67329a9e | 561 | if (i < 0 || i >= scm_i_port_table_size) |
0f2d19dd JB |
562 | return SCM_BOOL_F; |
563 | else | |
67329a9e | 564 | return scm_i_port_table[i]->port; |
0f2d19dd | 565 | } |
1bbd0b84 | 566 | #undef FUNC_NAME |
0f2d19dd JB |
567 | #endif |
568 | ||
70df8af6 | 569 | void |
92c2555f | 570 | scm_port_non_buffer (scm_t_port *pt) |
70df8af6 GH |
571 | { |
572 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; | |
573 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
574 | pt->read_buf_size = pt->write_buf_size = 1; | |
575 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
576 | } | |
0f2d19dd | 577 | |
d68fee48 JB |
578 | \f |
579 | /* Revealed counts --- an oddity inherited from SCSH. */ | |
580 | ||
8b13c6b3 GH |
581 | /* Find a port in the table and return its revealed count. |
582 | Also used by the garbage collector. | |
0f2d19dd | 583 | */ |
1cc91f1b | 584 | |
0f2d19dd | 585 | int |
a284e297 | 586 | scm_revealed_count (SCM port) |
0f2d19dd JB |
587 | { |
588 | return SCM_REVEALED(port); | |
589 | } | |
590 | ||
591 | ||
592 | ||
593 | /* Return the revealed count for a port. */ | |
594 | ||
3b3b36dd | 595 | SCM_DEFINE (scm_port_revealed, "port-revealed", 1, 0, 0, |
1bbd0b84 | 596 | (SCM port), |
1e6808ea | 597 | "Return the revealed count for @var{port}.") |
1bbd0b84 | 598 | #define FUNC_NAME s_scm_port_revealed |
0f2d19dd | 599 | { |
78446828 | 600 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 601 | SCM_VALIDATE_OPENPORT (1, port); |
8b13c6b3 | 602 | return SCM_MAKINUM (scm_revealed_count (port)); |
0f2d19dd | 603 | } |
1bbd0b84 | 604 | #undef FUNC_NAME |
0f2d19dd JB |
605 | |
606 | /* Set the revealed count for a port. */ | |
3b3b36dd | 607 | SCM_DEFINE (scm_set_port_revealed_x, "set-port-revealed!", 2, 0, 0, |
1bbd0b84 | 608 | (SCM port, SCM rcount), |
b450f070 | 609 | "Sets the revealed count for a port to a given value.\n" |
b380b885 | 610 | "The return value is unspecified.") |
1bbd0b84 | 611 | #define FUNC_NAME s_scm_set_port_revealed_x |
0f2d19dd | 612 | { |
78446828 | 613 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 HWN |
614 | SCM_VALIDATE_OPENPORT (1, port); |
615 | SCM_VALIDATE_INUM (2, rcount); | |
0f2d19dd | 616 | SCM_REVEALED (port) = SCM_INUM (rcount); |
8b13c6b3 | 617 | return SCM_UNSPECIFIED; |
0f2d19dd | 618 | } |
1bbd0b84 | 619 | #undef FUNC_NAME |
0f2d19dd | 620 | |
d68fee48 JB |
621 | |
622 | \f | |
623 | /* Retrieving a port's mode. */ | |
624 | ||
eadd48de GH |
625 | /* Return the flags that characterize a port based on the mode |
626 | * string used to open a file for that port. | |
627 | * | |
628 | * See PORT FLAGS in scm.h | |
629 | */ | |
630 | ||
631 | long | |
a284e297 | 632 | scm_mode_bits (char *modes) |
eadd48de GH |
633 | { |
634 | return (SCM_OPN | |
635 | | (strchr (modes, 'r') || strchr (modes, '+') ? SCM_RDNG : 0) | |
636 | | ( strchr (modes, 'w') | |
637 | || strchr (modes, 'a') | |
638 | || strchr (modes, '+') ? SCM_WRTNG : 0) | |
ee149d03 JB |
639 | | (strchr (modes, '0') ? SCM_BUF0 : 0) |
640 | | (strchr (modes, 'l') ? SCM_BUFLINE : 0)); | |
eadd48de GH |
641 | } |
642 | ||
643 | ||
644 | /* Return the mode flags from an open port. | |
645 | * Some modes such as "append" are only used when opening | |
646 | * a file and are not returned here. */ | |
647 | ||
3b3b36dd | 648 | SCM_DEFINE (scm_port_mode, "port-mode", 1, 0, 0, |
1bbd0b84 | 649 | (SCM port), |
1e6808ea MG |
650 | "Return the port modes associated with the open port @var{port}.\n" |
651 | "These will not necessarily be identical to the modes used when\n" | |
652 | "the port was opened, since modes such as \"append\" which are\n" | |
653 | "used only during port creation are not retained.") | |
1bbd0b84 | 654 | #define FUNC_NAME s_scm_port_mode |
eadd48de | 655 | { |
26a3038d | 656 | char modes[4]; |
eadd48de | 657 | modes[0] = '\0'; |
78446828 MV |
658 | |
659 | port = SCM_COERCE_OUTPORT (port); | |
34d19ef6 | 660 | SCM_VALIDATE_OPPORT (1, port); |
f9a64404 DH |
661 | if (SCM_CELL_WORD_0 (port) & SCM_RDNG) { |
662 | if (SCM_CELL_WORD_0 (port) & SCM_WRTNG) | |
eadd48de GH |
663 | strcpy (modes, "r+"); |
664 | else | |
665 | strcpy (modes, "r"); | |
666 | } | |
f9a64404 | 667 | else if (SCM_CELL_WORD_0 (port) & SCM_WRTNG) |
eadd48de | 668 | strcpy (modes, "w"); |
f9a64404 | 669 | if (SCM_CELL_WORD_0 (port) & SCM_BUF0) |
eadd48de | 670 | strcat (modes, "0"); |
36284627 | 671 | return scm_mem2string (modes, strlen (modes)); |
eadd48de | 672 | } |
1bbd0b84 | 673 | #undef FUNC_NAME |
eadd48de GH |
674 | |
675 | ||
d68fee48 JB |
676 | \f |
677 | /* Closing ports. */ | |
678 | ||
0f2d19dd JB |
679 | /* scm_close_port |
680 | * Call the close operation on a port object. | |
eadd48de | 681 | * see also scm_close. |
0f2d19dd | 682 | */ |
3b3b36dd | 683 | SCM_DEFINE (scm_close_port, "close-port", 1, 0, 0, |
1bbd0b84 | 684 | (SCM port), |
1e6808ea MG |
685 | "Close the specified port object. Return @code{#t} if it\n" |
686 | "successfully closes a port or @code{#f} if it was already\n" | |
687 | "closed. An exception may be raised if an error occurs, for\n" | |
688 | "example when flushing buffered output. See also @ref{Ports and\n" | |
689 | "File Descriptors, close}, for a procedure which can close file\n" | |
690 | "descriptors.") | |
1bbd0b84 | 691 | #define FUNC_NAME s_scm_close_port |
0f2d19dd | 692 | { |
1be6b49c | 693 | size_t i; |
eadd48de GH |
694 | int rv; |
695 | ||
78446828 MV |
696 | port = SCM_COERCE_OUTPORT (port); |
697 | ||
7a754ca6 | 698 | SCM_VALIDATE_PORT (1, port); |
0f2d19dd | 699 | if (SCM_CLOSEDP (port)) |
eadd48de | 700 | return SCM_BOOL_F; |
0f2d19dd | 701 | i = SCM_PTOBNUM (port); |
affc96b5 GH |
702 | if (scm_ptobs[i].close) |
703 | rv = (scm_ptobs[i].close) (port); | |
eadd48de GH |
704 | else |
705 | rv = 0; | |
0f2d19dd | 706 | scm_remove_from_port_table (port); |
22a52da1 | 707 | SCM_CLR_PORT_OPEN_FLAG (port); |
36284627 | 708 | return SCM_BOOL (rv >= 0); |
7a754ca6 MD |
709 | } |
710 | #undef FUNC_NAME | |
711 | ||
712 | SCM_DEFINE (scm_close_input_port, "close-input-port", 1, 0, 0, | |
713 | (SCM port), | |
714 | "Close the specified input port object. The routine has no effect if\n" | |
715 | "the file has already been closed. An exception may be raised if an\n" | |
716 | "error occurs. The value returned is unspecified.\n\n" | |
717 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" | |
718 | "which can close file descriptors.") | |
719 | #define FUNC_NAME s_scm_close_input_port | |
720 | { | |
721 | SCM_VALIDATE_INPUT_PORT (1, port); | |
722 | scm_close_port (port); | |
723 | return SCM_UNSPECIFIED; | |
724 | } | |
725 | #undef FUNC_NAME | |
726 | ||
727 | SCM_DEFINE (scm_close_output_port, "close-output-port", 1, 0, 0, | |
728 | (SCM port), | |
729 | "Close the specified output port object. The routine has no effect if\n" | |
730 | "the file has already been closed. An exception may be raised if an\n" | |
731 | "error occurs. The value returned is unspecified.\n\n" | |
732 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" | |
733 | "which can close file descriptors.") | |
734 | #define FUNC_NAME s_scm_close_output_port | |
735 | { | |
736 | port = SCM_COERCE_OUTPORT (port); | |
737 | SCM_VALIDATE_OUTPUT_PORT (1, port); | |
738 | scm_close_port (port); | |
739 | return SCM_UNSPECIFIED; | |
0f2d19dd | 740 | } |
1bbd0b84 | 741 | #undef FUNC_NAME |
0f2d19dd | 742 | |
c2ca4493 GH |
743 | SCM_DEFINE (scm_port_for_each, "port-for-each", 1, 0, 0, |
744 | (SCM proc), | |
745 | "Apply @var{proc} to each port in the Guile port table\n" | |
2f1bbcfd MV |
746 | "in turn. The return value is unspecified. More specifically,\n" |
747 | "@var{proc} is applied exactly once to every port that exists\n" | |
748 | "in the system at the time @var{port-for-each} is invoked.\n" | |
749 | "Changes to the port table while @var{port-for-each} is running\n" | |
9401323e | 750 | "have no effect as far as @var{port-for-each} is concerned.") |
c2ca4493 GH |
751 | #define FUNC_NAME s_scm_port_for_each |
752 | { | |
c014a02e | 753 | long i; |
fdfe6305 MV |
754 | SCM ports; |
755 | ||
c2ca4493 GH |
756 | SCM_VALIDATE_PROC (1, proc); |
757 | ||
758 | /* when pre-emptive multithreading is supported, access to the port | |
759 | table will need to be controlled by a mutex. */ | |
fdfe6305 MV |
760 | |
761 | /* Even without pre-emptive multithreading, running arbitrary code | |
762 | while scanning the port table is unsafe because the port table | |
763 | can change arbitrarily (from a GC, for example). So we build a | |
764 | list in advance while blocking the GC. -mvo */ | |
765 | ||
c2ca4493 | 766 | SCM_DEFER_INTS; |
fdfe6305 MV |
767 | scm_block_gc++; |
768 | ports = SCM_EOL; | |
67329a9e HWN |
769 | for (i = 0; i < scm_i_port_table_size; i++) |
770 | ports = scm_cons (scm_i_port_table[i]->port, ports); | |
fdfe6305 MV |
771 | scm_block_gc--; |
772 | SCM_ALLOW_INTS; | |
773 | ||
774 | while (ports != SCM_EOL) | |
c2ca4493 | 775 | { |
fdc28395 | 776 | scm_call_1 (proc, SCM_CAR (ports)); |
fdfe6305 | 777 | ports = SCM_CDR (ports); |
c2ca4493 | 778 | } |
fdfe6305 | 779 | |
c2ca4493 GH |
780 | return SCM_UNSPECIFIED; |
781 | } | |
782 | #undef FUNC_NAME | |
783 | ||
d68fee48 JB |
784 | \f |
785 | /* Utter miscellany. Gosh, we should clean this up some time. */ | |
786 | ||
3b3b36dd | 787 | SCM_DEFINE (scm_input_port_p, "input-port?", 1, 0, 0, |
1bbd0b84 | 788 | (SCM x), |
1e6808ea MG |
789 | "Return @code{#t} if @var{x} is an input port, otherwise return\n" |
790 | "@code{#f}. Any object satisfying this predicate also satisfies\n" | |
791 | "@code{port?}.") | |
1bbd0b84 | 792 | #define FUNC_NAME s_scm_input_port_p |
0f2d19dd | 793 | { |
36284627 | 794 | return SCM_BOOL (SCM_INPUT_PORT_P (x)); |
0f2d19dd | 795 | } |
1bbd0b84 | 796 | #undef FUNC_NAME |
0f2d19dd | 797 | |
3b3b36dd | 798 | SCM_DEFINE (scm_output_port_p, "output-port?", 1, 0, 0, |
1bbd0b84 | 799 | (SCM x), |
1e6808ea MG |
800 | "Return @code{#t} if @var{x} is an output port, otherwise return\n" |
801 | "@code{#f}. Any object satisfying this predicate also satisfies\n" | |
802 | "@code{port?}.") | |
1bbd0b84 | 803 | #define FUNC_NAME s_scm_output_port_p |
0f2d19dd | 804 | { |
82893676 | 805 | x = SCM_COERCE_OUTPORT (x); |
36284627 | 806 | return SCM_BOOL (SCM_OUTPUT_PORT_P (x)); |
0f2d19dd | 807 | } |
1bbd0b84 | 808 | #undef FUNC_NAME |
0f2d19dd | 809 | |
eb5c0a2a GH |
810 | SCM_DEFINE (scm_port_p, "port?", 1, 0, 0, |
811 | (SCM x), | |
1e6808ea | 812 | "Return a boolean indicating whether @var{x} is a port.\n" |
5352393c MG |
813 | "Equivalent to @code{(or (input-port? @var{x}) (output-port?\n" |
814 | "@var{x}))}.") | |
eb5c0a2a GH |
815 | #define FUNC_NAME s_scm_port_p |
816 | { | |
817 | return SCM_BOOL (SCM_PORTP (x)); | |
818 | } | |
819 | #undef FUNC_NAME | |
820 | ||
3b3b36dd | 821 | SCM_DEFINE (scm_port_closed_p, "port-closed?", 1, 0, 0, |
1bbd0b84 | 822 | (SCM port), |
1e6808ea MG |
823 | "Return @code{#t} if @var{port} is closed or @code{#f} if it is\n" |
824 | "open.") | |
1bbd0b84 | 825 | #define FUNC_NAME s_scm_port_closed_p |
60d0643d | 826 | { |
34d19ef6 | 827 | SCM_VALIDATE_PORT (1, port); |
36284627 | 828 | return SCM_BOOL (!SCM_OPPORTP (port)); |
60d0643d | 829 | } |
1bbd0b84 | 830 | #undef FUNC_NAME |
0f2d19dd | 831 | |
3b3b36dd | 832 | SCM_DEFINE (scm_eof_object_p, "eof-object?", 1, 0, 0, |
1bbd0b84 | 833 | (SCM x), |
1e6808ea MG |
834 | "Return @code{#t} if @var{x} is an end-of-file object; otherwise\n" |
835 | "return @code{#f}.") | |
1bbd0b84 | 836 | #define FUNC_NAME s_scm_eof_object_p |
0f2d19dd | 837 | { |
1bbd0b84 | 838 | return SCM_BOOL(SCM_EOF_OBJECT_P (x)); |
0f2d19dd | 839 | } |
1bbd0b84 | 840 | #undef FUNC_NAME |
0f2d19dd | 841 | |
3b3b36dd | 842 | SCM_DEFINE (scm_force_output, "force-output", 0, 1, 0, |
1bbd0b84 | 843 | (SCM port), |
b380b885 | 844 | "Flush the specified output port, or the current output port if @var{port}\n" |
9401323e | 845 | "is omitted. The current output buffer contents are passed to the\n" |
b380b885 MD |
846 | "underlying port implementation (e.g., in the case of fports, the\n" |
847 | "data will be written to the file and the output buffer will be cleared.)\n" | |
848 | "It has no effect on an unbuffered port.\n\n" | |
849 | "The return value is unspecified.") | |
1bbd0b84 | 850 | #define FUNC_NAME s_scm_force_output |
0f2d19dd JB |
851 | { |
852 | if (SCM_UNBNDP (port)) | |
3e877d15 | 853 | port = scm_cur_outp; |
0f2d19dd | 854 | else |
78446828 MV |
855 | { |
856 | port = SCM_COERCE_OUTPORT (port); | |
34d19ef6 | 857 | SCM_VALIDATE_OPOUTPORT (1, port); |
78446828 | 858 | } |
affc96b5 | 859 | scm_flush (port); |
ee149d03 | 860 | return SCM_UNSPECIFIED; |
0f2d19dd | 861 | } |
1bbd0b84 | 862 | #undef FUNC_NAME |
0f2d19dd | 863 | |
a1ec6916 | 864 | SCM_DEFINE (scm_flush_all_ports, "flush-all-ports", 0, 0, 0, |
1bbd0b84 | 865 | (), |
b380b885 MD |
866 | "Equivalent to calling @code{force-output} on\n" |
867 | "all open output ports. The return value is unspecified.") | |
1bbd0b84 | 868 | #define FUNC_NAME s_scm_flush_all_ports |
89ea5b7c | 869 | { |
1be6b49c | 870 | size_t i; |
89ea5b7c | 871 | |
67329a9e | 872 | for (i = 0; i < scm_i_port_table_size; i++) |
89ea5b7c | 873 | { |
67329a9e HWN |
874 | if (SCM_OPOUTPORTP (scm_i_port_table[i]->port)) |
875 | scm_flush (scm_i_port_table[i]->port); | |
89ea5b7c GH |
876 | } |
877 | return SCM_UNSPECIFIED; | |
878 | } | |
1bbd0b84 | 879 | #undef FUNC_NAME |
0f2d19dd | 880 | |
3b3b36dd | 881 | SCM_DEFINE (scm_read_char, "read-char", 0, 1, 0, |
1bbd0b84 | 882 | (SCM port), |
1e6808ea MG |
883 | "Return the next character available from @var{port}, updating\n" |
884 | "@var{port} to point to the following character. If no more\n" | |
885 | "characters are available, the end-of-file object is returned.") | |
1bbd0b84 | 886 | #define FUNC_NAME s_scm_read_char |
0f2d19dd JB |
887 | { |
888 | int c; | |
889 | if (SCM_UNBNDP (port)) | |
334341aa | 890 | port = scm_cur_inp; |
34d19ef6 | 891 | SCM_VALIDATE_OPINPORT (1, port); |
b7f3516f | 892 | c = scm_getc (port); |
0f2d19dd JB |
893 | if (EOF == c) |
894 | return SCM_EOF_VAL; | |
7866a09b | 895 | return SCM_MAKE_CHAR (c); |
0f2d19dd | 896 | } |
1bbd0b84 | 897 | #undef FUNC_NAME |
0f2d19dd | 898 | |
5c070ca7 | 899 | /* this should only be called when the read buffer is empty. it |
affc96b5 | 900 | tries to refill the read buffer. it returns the first char from |
5c070ca7 | 901 | the port, which is either EOF or *(pt->read_pos). */ |
6c951427 | 902 | int |
affc96b5 | 903 | scm_fill_input (SCM port) |
6c951427 | 904 | { |
92c2555f | 905 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
283a1a0e | 906 | |
6c951427 GH |
907 | if (pt->read_buf == pt->putback_buf) |
908 | { | |
909 | /* finished reading put-back chars. */ | |
910 | pt->read_buf = pt->saved_read_buf; | |
911 | pt->read_pos = pt->saved_read_pos; | |
912 | pt->read_end = pt->saved_read_end; | |
913 | pt->read_buf_size = pt->saved_read_buf_size; | |
914 | if (pt->read_pos < pt->read_end) | |
5c070ca7 | 915 | return *(pt->read_pos); |
6c951427 | 916 | } |
affc96b5 | 917 | return scm_ptobs[SCM_PTOBNUM (port)].fill_input (port); |
6c951427 GH |
918 | } |
919 | ||
ee149d03 | 920 | int |
a284e297 | 921 | scm_getc (SCM port) |
0f2d19dd JB |
922 | { |
923 | int c; | |
92c2555f | 924 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
ee149d03 | 925 | |
840ae05d JB |
926 | if (pt->rw_active == SCM_PORT_WRITE) |
927 | { | |
affc96b5 GH |
928 | /* may be marginally faster than calling scm_flush. */ |
929 | scm_ptobs[SCM_PTOBNUM (port)].flush (port); | |
840ae05d | 930 | } |
6c951427 | 931 | |
5c070ca7 GH |
932 | if (pt->rw_random) |
933 | pt->rw_active = SCM_PORT_READ; | |
934 | ||
935 | if (pt->read_pos >= pt->read_end) | |
ee149d03 | 936 | { |
affc96b5 | 937 | if (scm_fill_input (port) == EOF) |
5c070ca7 | 938 | return EOF; |
ee149d03 JB |
939 | } |
940 | ||
5c070ca7 | 941 | c = *(pt->read_pos++); |
840ae05d | 942 | |
ee149d03 JB |
943 | if (c == '\n') |
944 | { | |
945 | SCM_INCLINE (port); | |
946 | } | |
947 | else if (c == '\t') | |
948 | { | |
949 | SCM_TABCOL (port); | |
950 | } | |
951 | else | |
952 | { | |
953 | SCM_INCCOL (port); | |
954 | } | |
955 | ||
956 | return c; | |
0f2d19dd JB |
957 | } |
958 | ||
ee149d03 | 959 | void |
a284e297 | 960 | scm_putc (char c, SCM port) |
ee149d03 | 961 | { |
265e6a4d | 962 | scm_lfwrite (&c, 1, port); |
ee149d03 | 963 | } |
3cb988bd | 964 | |
ee149d03 | 965 | void |
70d63753 | 966 | scm_puts (const char *s, SCM port) |
3cb988bd | 967 | { |
265e6a4d | 968 | scm_lfwrite (s, strlen (s), port); |
ee149d03 | 969 | } |
3cb988bd | 970 | |
6fe692e9 MD |
971 | /* scm_lfwrite |
972 | * | |
53802ea8 MV |
973 | * This function differs from scm_c_write; it updates port line and |
974 | * column. */ | |
6fe692e9 | 975 | |
ee149d03 | 976 | void |
1be6b49c | 977 | scm_lfwrite (const char *ptr, size_t size, SCM port) |
ee149d03 | 978 | { |
92c2555f MV |
979 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
980 | scm_t_ptob_descriptor *ptob = &scm_ptobs[SCM_PTOBNUM (port)]; | |
3e2043c4 | 981 | |
840ae05d | 982 | if (pt->rw_active == SCM_PORT_READ) |
affc96b5 | 983 | scm_end_input (port); |
283a1a0e | 984 | |
31703ab8 | 985 | ptob->write (port, ptr, size); |
840ae05d | 986 | |
53802ea8 MV |
987 | for (; size; ptr++, size--) { |
988 | if (*ptr == '\n') { | |
989 | SCM_INCLINE(port); | |
990 | } | |
991 | else if (*ptr == '\t') { | |
992 | SCM_TABCOL(port); | |
993 | } | |
994 | else { | |
995 | SCM_INCCOL(port); | |
996 | } | |
997 | } | |
998 | ||
840ae05d JB |
999 | if (pt->rw_random) |
1000 | pt->rw_active = SCM_PORT_WRITE; | |
ee149d03 | 1001 | } |
3cb988bd | 1002 | |
6fe692e9 MD |
1003 | /* scm_c_read |
1004 | * | |
1005 | * Used by an application to read arbitrary number of bytes from an | |
1006 | * SCM port. Same semantics as libc read, except that scm_c_read only | |
1007 | * returns less than SIZE bytes if at end-of-file. | |
1008 | * | |
1009 | * Warning: Doesn't update port line and column counts! */ | |
1010 | ||
1be6b49c ML |
1011 | size_t |
1012 | scm_c_read (SCM port, void *buffer, size_t size) | |
6fe692e9 | 1013 | { |
92c2555f | 1014 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
1be6b49c | 1015 | size_t n_read = 0, n_available; |
6fe692e9 MD |
1016 | |
1017 | if (pt->rw_active == SCM_PORT_WRITE) | |
1018 | scm_ptobs[SCM_PTOBNUM (port)].flush (port); | |
1019 | ||
1020 | if (pt->rw_random) | |
1021 | pt->rw_active = SCM_PORT_READ; | |
1022 | ||
1023 | if (SCM_READ_BUFFER_EMPTY_P (pt)) | |
1024 | { | |
1025 | if (scm_fill_input (port) == EOF) | |
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | n_available = pt->read_end - pt->read_pos; | |
1030 | ||
1031 | while (n_available < size) | |
1032 | { | |
1033 | memcpy (buffer, pt->read_pos, n_available); | |
910d1e40 | 1034 | buffer = (char *) buffer + n_available; |
6fe692e9 MD |
1035 | pt->read_pos += n_available; |
1036 | n_read += n_available; | |
1037 | ||
1038 | if (SCM_READ_BUFFER_EMPTY_P (pt)) | |
1039 | { | |
1040 | if (scm_fill_input (port) == EOF) | |
1041 | return n_read; | |
1042 | } | |
1043 | ||
1044 | size -= n_available; | |
1045 | n_available = pt->read_end - pt->read_pos; | |
1046 | } | |
1047 | ||
1048 | memcpy (buffer, pt->read_pos, size); | |
1049 | pt->read_pos += size; | |
1050 | ||
1051 | return n_read + size; | |
1052 | } | |
1053 | ||
1054 | /* scm_c_write | |
1055 | * | |
1056 | * Used by an application to write arbitrary number of bytes to an SCM | |
1057 | * port. Similar semantics as libc write. However, unlike libc | |
1058 | * write, scm_c_write writes the requested number of bytes and has no | |
1059 | * return value. | |
1060 | * | |
1061 | * Warning: Doesn't update port line and column counts! | |
1062 | */ | |
1063 | ||
1064 | void | |
1be6b49c | 1065 | scm_c_write (SCM port, const void *ptr, size_t size) |
6fe692e9 | 1066 | { |
92c2555f MV |
1067 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
1068 | scm_t_ptob_descriptor *ptob = &scm_ptobs[SCM_PTOBNUM (port)]; | |
6fe692e9 MD |
1069 | |
1070 | if (pt->rw_active == SCM_PORT_READ) | |
1071 | scm_end_input (port); | |
1072 | ||
1073 | ptob->write (port, ptr, size); | |
1074 | ||
1075 | if (pt->rw_random) | |
1076 | pt->rw_active = SCM_PORT_WRITE; | |
1077 | } | |
3cb988bd | 1078 | |
ee149d03 | 1079 | void |
a284e297 | 1080 | scm_flush (SCM port) |
ee149d03 | 1081 | { |
c014a02e | 1082 | long i = SCM_PTOBNUM (port); |
affc96b5 | 1083 | (scm_ptobs[i].flush) (port); |
ee149d03 JB |
1084 | } |
1085 | ||
283a1a0e | 1086 | void |
a284e297 | 1087 | scm_end_input (SCM port) |
283a1a0e | 1088 | { |
c014a02e | 1089 | long offset; |
92c2555f | 1090 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
283a1a0e GH |
1091 | |
1092 | if (pt->read_buf == pt->putback_buf) | |
1093 | { | |
1094 | offset = pt->read_end - pt->read_pos; | |
1095 | pt->read_buf = pt->saved_read_buf; | |
1096 | pt->read_pos = pt->saved_read_pos; | |
1097 | pt->read_end = pt->saved_read_end; | |
1098 | pt->read_buf_size = pt->saved_read_buf_size; | |
1099 | } | |
1100 | else | |
1101 | offset = 0; | |
1102 | ||
affc96b5 | 1103 | scm_ptobs[SCM_PTOBNUM (port)].end_input (port, offset); |
283a1a0e GH |
1104 | } |
1105 | ||
ee149d03 JB |
1106 | \f |
1107 | ||
1108 | ||
1109 | void | |
a284e297 | 1110 | scm_ungetc (int c, SCM port) |
c6c79933 | 1111 | #define FUNC_NAME "scm_ungetc" |
ee149d03 | 1112 | { |
92c2555f | 1113 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
840ae05d | 1114 | |
6c951427 GH |
1115 | if (pt->read_buf == pt->putback_buf) |
1116 | /* already using the put-back buffer. */ | |
1117 | { | |
1118 | /* enlarge putback_buf if necessary. */ | |
1119 | if (pt->read_end == pt->read_buf + pt->read_buf_size | |
1120 | && pt->read_buf == pt->read_pos) | |
1121 | { | |
1be6b49c | 1122 | size_t new_size = pt->read_buf_size * 2; |
c6c79933 | 1123 | unsigned char *tmp = (unsigned char *) |
4c9419ac MV |
1124 | scm_gc_realloc (pt->putback_buf, pt->read_buf_size, new_size, |
1125 | "putback buffer"); | |
6c951427 | 1126 | |
6c951427 GH |
1127 | pt->read_pos = pt->read_buf = pt->putback_buf = tmp; |
1128 | pt->read_end = pt->read_buf + pt->read_buf_size; | |
1129 | pt->read_buf_size = pt->putback_buf_size = new_size; | |
1130 | } | |
1131 | ||
1132 | /* shift any existing bytes to buffer + 1. */ | |
1133 | if (pt->read_pos == pt->read_end) | |
1134 | pt->read_end = pt->read_buf + 1; | |
1135 | else if (pt->read_pos != pt->read_buf + 1) | |
1136 | { | |
1137 | int count = pt->read_end - pt->read_pos; | |
1138 | ||
1139 | memmove (pt->read_buf + 1, pt->read_pos, count); | |
1140 | pt->read_end = pt->read_buf + 1 + count; | |
1141 | } | |
1142 | ||
1143 | pt->read_pos = pt->read_buf; | |
1144 | } | |
1145 | else | |
1146 | /* switch to the put-back buffer. */ | |
1147 | { | |
1148 | if (pt->putback_buf == NULL) | |
1149 | { | |
c357d546 | 1150 | pt->putback_buf |
4c9419ac MV |
1151 | = (unsigned char *) scm_gc_malloc (SCM_INITIAL_PUTBACK_BUF_SIZE, |
1152 | "putback buffer"); | |
6c951427 GH |
1153 | pt->putback_buf_size = SCM_INITIAL_PUTBACK_BUF_SIZE; |
1154 | } | |
1155 | ||
1156 | pt->saved_read_buf = pt->read_buf; | |
1157 | pt->saved_read_pos = pt->read_pos; | |
1158 | pt->saved_read_end = pt->read_end; | |
1159 | pt->saved_read_buf_size = pt->read_buf_size; | |
1160 | ||
1161 | pt->read_pos = pt->read_buf = pt->putback_buf; | |
1162 | pt->read_end = pt->read_buf + 1; | |
1163 | pt->read_buf_size = pt->putback_buf_size; | |
1164 | } | |
1165 | ||
1166 | *pt->read_buf = c; | |
ee149d03 | 1167 | |
840ae05d JB |
1168 | if (pt->rw_random) |
1169 | pt->rw_active = SCM_PORT_READ; | |
1170 | ||
ee149d03 JB |
1171 | if (c == '\n') |
1172 | { | |
1173 | /* What should col be in this case? | |
1174 | * We'll leave it at -1. | |
1175 | */ | |
1176 | SCM_LINUM (port) -= 1; | |
1177 | } | |
1178 | else | |
1179 | SCM_COL(port) -= 1; | |
1180 | } | |
c6c79933 | 1181 | #undef FUNC_NAME |
ee149d03 JB |
1182 | |
1183 | ||
1184 | void | |
70d63753 | 1185 | scm_ungets (const char *s, int n, SCM port) |
ee149d03 JB |
1186 | { |
1187 | /* This is simple minded and inefficient, but unreading strings is | |
1188 | * probably not a common operation, and remember that line and | |
1189 | * column numbers have to be handled... | |
1190 | * | |
1191 | * Please feel free to write an optimized version! | |
1192 | */ | |
1193 | while (n--) | |
1194 | scm_ungetc (s[n], port); | |
1195 | } | |
1196 | ||
1197 | ||
3b3b36dd | 1198 | SCM_DEFINE (scm_peek_char, "peek-char", 0, 1, 0, |
1bbd0b84 | 1199 | (SCM port), |
1e6808ea MG |
1200 | "Return the next character available from @var{port},\n" |
1201 | "@emph{without} updating @var{port} to point to the following\n" | |
1202 | "character. If no more characters are available, the\n" | |
1203 | "end-of-file object is returned.@footnote{The value returned by\n" | |
1204 | "a call to @code{peek-char} is the same as the value that would\n" | |
1205 | "have been returned by a call to @code{read-char} on the same\n" | |
1206 | "port. The only difference is that the very next call to\n" | |
1207 | "@code{read-char} or @code{peek-char} on that @var{port} will\n" | |
1208 | "return the value returned by the preceding call to\n" | |
1209 | "@code{peek-char}. In particular, a call to @code{peek-char} on\n" | |
1210 | "an interactive port will hang waiting for input whenever a call\n" | |
1211 | "to @code{read-char} would have hung.}") | |
1bbd0b84 | 1212 | #define FUNC_NAME s_scm_peek_char |
ee149d03 JB |
1213 | { |
1214 | int c; | |
1215 | if (SCM_UNBNDP (port)) | |
1216 | port = scm_cur_inp; | |
1217 | else | |
34d19ef6 | 1218 | SCM_VALIDATE_OPINPORT (1, port); |
ee149d03 JB |
1219 | c = scm_getc (port); |
1220 | if (EOF == c) | |
1221 | return SCM_EOF_VAL; | |
1222 | scm_ungetc (c, port); | |
7866a09b | 1223 | return SCM_MAKE_CHAR (c); |
3cb988bd | 1224 | } |
1bbd0b84 | 1225 | #undef FUNC_NAME |
3cb988bd | 1226 | |
1be4270a | 1227 | SCM_DEFINE (scm_unread_char, "unread-char", 1, 1, 0, |
1bbd0b84 | 1228 | (SCM cobj, SCM port), |
b380b885 MD |
1229 | "Place @var{char} in @var{port} so that it will be read by the\n" |
1230 | "next read operation. If called multiple times, the unread characters\n" | |
1231 | "will be read again in last-in first-out order. If @var{port} is\n" | |
1232 | "not supplied, the current input port is used.") | |
1bbd0b84 | 1233 | #define FUNC_NAME s_scm_unread_char |
0f2d19dd JB |
1234 | { |
1235 | int c; | |
1236 | ||
34d19ef6 | 1237 | SCM_VALIDATE_CHAR (1, cobj); |
0f2d19dd JB |
1238 | if (SCM_UNBNDP (port)) |
1239 | port = scm_cur_inp; | |
1240 | else | |
34d19ef6 | 1241 | SCM_VALIDATE_OPINPORT (2, port); |
0f2d19dd | 1242 | |
7866a09b | 1243 | c = SCM_CHAR (cobj); |
0f2d19dd | 1244 | |
b7f3516f | 1245 | scm_ungetc (c, port); |
0f2d19dd JB |
1246 | return cobj; |
1247 | } | |
1bbd0b84 | 1248 | #undef FUNC_NAME |
0f2d19dd | 1249 | |
a1ec6916 | 1250 | SCM_DEFINE (scm_unread_string, "unread-string", 2, 0, 0, |
1bbd0b84 | 1251 | (SCM str, SCM port), |
b380b885 MD |
1252 | "Place the string @var{str} in @var{port} so that its characters will be\n" |
1253 | "read in subsequent read operations. If called multiple times, the\n" | |
1254 | "unread characters will be read again in last-in first-out order. If\n" | |
1255 | "@var{port} is not supplied, the current-input-port is used.") | |
1bbd0b84 | 1256 | #define FUNC_NAME s_scm_unread_string |
ee1e7e13 | 1257 | { |
34d19ef6 | 1258 | SCM_VALIDATE_STRING (1, str); |
ee1e7e13 MD |
1259 | if (SCM_UNBNDP (port)) |
1260 | port = scm_cur_inp; | |
1261 | else | |
34d19ef6 | 1262 | SCM_VALIDATE_OPINPORT (2, port); |
ee1e7e13 | 1263 | |
34f0f2b8 | 1264 | scm_ungets (SCM_STRING_CHARS (str), SCM_STRING_LENGTH (str), port); |
ee1e7e13 MD |
1265 | |
1266 | return str; | |
1267 | } | |
1bbd0b84 | 1268 | #undef FUNC_NAME |
ee1e7e13 | 1269 | |
a1ec6916 | 1270 | SCM_DEFINE (scm_seek, "seek", 3, 0, 0, |
1e6808ea MG |
1271 | (SCM fd_port, SCM offset, SCM whence), |
1272 | "Sets the current position of @var{fd/port} to the integer\n" | |
1273 | "@var{offset}, which is interpreted according to the value of\n" | |
1274 | "@var{whence}.\n" | |
1275 | "\n" | |
1276 | "One of the following variables should be supplied for\n" | |
1277 | "@var{whence}:\n" | |
b380b885 MD |
1278 | "@defvar SEEK_SET\n" |
1279 | "Seek from the beginning of the file.\n" | |
1280 | "@end defvar\n" | |
1281 | "@defvar SEEK_CUR\n" | |
1282 | "Seek from the current position.\n" | |
1283 | "@end defvar\n" | |
1284 | "@defvar SEEK_END\n" | |
1285 | "Seek from the end of the file.\n" | |
1e6808ea MG |
1286 | "@end defvar\n" |
1287 | "If @var{fd/port} is a file descriptor, the underlying system\n" | |
1288 | "call is @code{lseek}. @var{port} may be a string port.\n" | |
1289 | "\n" | |
1290 | "The value returned is the new position in the file. This means\n" | |
1291 | "that the current position of a port can be obtained using:\n" | |
1292 | "@lisp\n" | |
b380b885 | 1293 | "(seek port 0 SEEK_CUR)\n" |
1e6808ea | 1294 | "@end lisp") |
1bbd0b84 | 1295 | #define FUNC_NAME s_scm_seek |
840ae05d JB |
1296 | { |
1297 | off_t off; | |
1298 | off_t rv; | |
1299 | int how; | |
1300 | ||
1e6808ea | 1301 | fd_port = SCM_COERCE_OUTPORT (fd_port); |
840ae05d | 1302 | |
6fe692e9 MD |
1303 | off = SCM_NUM2LONG (2, offset); |
1304 | SCM_VALIDATE_INUM_COPY (3, whence, how); | |
840ae05d | 1305 | if (how != SEEK_SET && how != SEEK_CUR && how != SEEK_END) |
1bbd0b84 | 1306 | SCM_OUT_OF_RANGE (3, whence); |
1e6808ea | 1307 | if (SCM_OPPORTP (fd_port)) |
840ae05d | 1308 | { |
92c2555f | 1309 | scm_t_ptob_descriptor *ptob = scm_ptobs + SCM_PTOBNUM (fd_port); |
840ae05d JB |
1310 | |
1311 | if (!ptob->seek) | |
1bbd0b84 | 1312 | SCM_MISC_ERROR ("port is not seekable", |
1e6808ea | 1313 | scm_cons (fd_port, SCM_EOL)); |
840ae05d | 1314 | else |
1e6808ea | 1315 | rv = ptob->seek (fd_port, off, how); |
840ae05d JB |
1316 | } |
1317 | else /* file descriptor?. */ | |
1318 | { | |
34d19ef6 | 1319 | SCM_VALIDATE_INUM (1, fd_port); |
1e6808ea | 1320 | rv = lseek (SCM_INUM (fd_port), off, how); |
840ae05d | 1321 | if (rv == -1) |
1bbd0b84 | 1322 | SCM_SYSERROR; |
840ae05d JB |
1323 | } |
1324 | return scm_long2num (rv); | |
1325 | } | |
1bbd0b84 | 1326 | #undef FUNC_NAME |
840ae05d | 1327 | |
82893676 MG |
1328 | #ifdef __MINGW32__ |
1329 | /* Define this function since it is not supported under Windows. */ | |
1330 | static int truncate (char *file, int length) | |
1331 | { | |
1332 | int ret = -1, fdes; | |
1333 | if ((fdes = open (file, O_BINARY | O_WRONLY)) != -1) | |
1334 | { | |
1335 | ret = chsize (fdes, length); | |
1336 | close (fdes); | |
1337 | } | |
1338 | return ret; | |
1339 | } | |
1340 | #endif /* __MINGW32__ */ | |
1341 | ||
a1ec6916 | 1342 | SCM_DEFINE (scm_truncate_file, "truncate-file", 1, 1, 0, |
1bbd0b84 | 1343 | (SCM object, SCM length), |
1e6808ea MG |
1344 | "Truncates the object referred to by @var{object} to at most\n" |
1345 | "@var{length} bytes. @var{object} can be a string containing a\n" | |
1346 | "file name or an integer file descriptor or a port.\n" | |
1347 | "@var{length} may be omitted if @var{object} is not a file name,\n" | |
1348 | "in which case the truncation occurs at the current port.\n" | |
1349 | "position. The return value is unspecified.") | |
1bbd0b84 | 1350 | #define FUNC_NAME s_scm_truncate_file |
840ae05d | 1351 | { |
69bc9ff3 GH |
1352 | int rv; |
1353 | off_t c_length; | |
1354 | ||
1355 | /* object can be a port, fdes or filename. */ | |
840ae05d | 1356 | |
840ae05d JB |
1357 | if (SCM_UNBNDP (length)) |
1358 | { | |
69bc9ff3 | 1359 | /* must supply length if object is a filename. */ |
a6d9e5ab | 1360 | if (SCM_STRINGP (object)) |
34d19ef6 | 1361 | SCM_MISC_ERROR("must supply length if OBJECT is a filename", SCM_EOL); |
69bc9ff3 | 1362 | |
c94577b4 | 1363 | length = scm_seek (object, SCM_INUM0, SCM_MAKINUM (SEEK_CUR)); |
840ae05d | 1364 | } |
34d19ef6 | 1365 | c_length = SCM_NUM2LONG (2, length); |
69bc9ff3 | 1366 | if (c_length < 0) |
1bbd0b84 | 1367 | SCM_MISC_ERROR ("negative offset", SCM_EOL); |
3fe6190f | 1368 | |
69bc9ff3 GH |
1369 | object = SCM_COERCE_OUTPORT (object); |
1370 | if (SCM_INUMP (object)) | |
1371 | { | |
1372 | SCM_SYSCALL (rv = ftruncate (SCM_INUM (object), c_length)); | |
1373 | } | |
0c95b57d | 1374 | else if (SCM_OPOUTPORTP (object)) |
69bc9ff3 | 1375 | { |
92c2555f MV |
1376 | scm_t_port *pt = SCM_PTAB_ENTRY (object); |
1377 | scm_t_ptob_descriptor *ptob = scm_ptobs + SCM_PTOBNUM (object); | |
69bc9ff3 | 1378 | |
affc96b5 | 1379 | if (!ptob->truncate) |
1bbd0b84 | 1380 | SCM_MISC_ERROR ("port is not truncatable", SCM_EOL); |
69bc9ff3 | 1381 | if (pt->rw_active == SCM_PORT_READ) |
affc96b5 | 1382 | scm_end_input (object); |
69bc9ff3 | 1383 | else if (pt->rw_active == SCM_PORT_WRITE) |
affc96b5 | 1384 | ptob->flush (object); |
69bc9ff3 | 1385 | |
affc96b5 | 1386 | ptob->truncate (object, c_length); |
69bc9ff3 GH |
1387 | rv = 0; |
1388 | } | |
1389 | else | |
1390 | { | |
a6d9e5ab | 1391 | SCM_VALIDATE_STRING (1, object); |
a6d9e5ab | 1392 | SCM_SYSCALL (rv = truncate (SCM_STRING_CHARS (object), c_length)); |
69bc9ff3 GH |
1393 | } |
1394 | if (rv == -1) | |
1bbd0b84 | 1395 | SCM_SYSERROR; |
840ae05d JB |
1396 | return SCM_UNSPECIFIED; |
1397 | } | |
1bbd0b84 | 1398 | #undef FUNC_NAME |
840ae05d | 1399 | |
a1ec6916 | 1400 | SCM_DEFINE (scm_port_line, "port-line", 1, 0, 0, |
1bbd0b84 | 1401 | (SCM port), |
e1546b65 | 1402 | "Return the current line number for @var{port}.") |
1bbd0b84 | 1403 | #define FUNC_NAME s_scm_port_line |
0f2d19dd | 1404 | { |
78446828 | 1405 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 1406 | SCM_VALIDATE_OPENPORT (1, port); |
360fc44c | 1407 | return SCM_MAKINUM (SCM_LINUM (port)); |
0f2d19dd | 1408 | } |
1bbd0b84 | 1409 | #undef FUNC_NAME |
0f2d19dd | 1410 | |
a1ec6916 | 1411 | SCM_DEFINE (scm_set_port_line_x, "set-port-line!", 2, 0, 0, |
1bbd0b84 | 1412 | (SCM port, SCM line), |
e1546b65 | 1413 | "Set the current line number for @var{port} to @var{line}.") |
1bbd0b84 | 1414 | #define FUNC_NAME s_scm_set_port_line_x |
d043d8c2 | 1415 | { |
360fc44c | 1416 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 HWN |
1417 | SCM_VALIDATE_OPENPORT (1, port); |
1418 | SCM_VALIDATE_INUM (2, line); | |
564478fd GB |
1419 | SCM_PTAB_ENTRY (port)->line_number = SCM_INUM (line); |
1420 | return SCM_UNSPECIFIED; | |
d043d8c2 | 1421 | } |
1bbd0b84 | 1422 | #undef FUNC_NAME |
d043d8c2 | 1423 | |
a1ec6916 | 1424 | SCM_DEFINE (scm_port_column, "port-column", 1, 0, 0, |
1bbd0b84 | 1425 | (SCM port), |
8f85c0c6 | 1426 | "@deffnx {Scheme Procedure} port-line port\n" |
650a1cf9 | 1427 | "Return the current column number or line number of @var{port},\n" |
b380b885 MD |
1428 | "using the current input port if none is specified. If the number is\n" |
1429 | "unknown, the result is #f. Otherwise, the result is a 0-origin integer\n" | |
1430 | "- i.e. the first character of the first line is line 0, column 0.\n" | |
1431 | "(However, when you display a file position, for example in an error\n" | |
650a1cf9 | 1432 | "message, we recommend you add 1 to get 1-origin integers. This is\n" |
b380b885 MD |
1433 | "because lines and column numbers traditionally start with 1, and that is\n" |
1434 | "what non-programmers will find most natural.)") | |
1bbd0b84 | 1435 | #define FUNC_NAME s_scm_port_column |
0f2d19dd | 1436 | { |
78446828 | 1437 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 1438 | SCM_VALIDATE_OPENPORT (1, port); |
360fc44c | 1439 | return SCM_MAKINUM (SCM_COL (port)); |
0f2d19dd | 1440 | } |
1bbd0b84 | 1441 | #undef FUNC_NAME |
0f2d19dd | 1442 | |
a1ec6916 | 1443 | SCM_DEFINE (scm_set_port_column_x, "set-port-column!", 2, 0, 0, |
1bbd0b84 | 1444 | (SCM port, SCM column), |
8f85c0c6 | 1445 | "@deffnx {Scheme Procedure} set-port-line! port line\n" |
92ccc1f1 | 1446 | "Set the current column or line number of @var{port}, using the\n" |
b380b885 | 1447 | "current input port if none is specified.") |
1bbd0b84 | 1448 | #define FUNC_NAME s_scm_set_port_column_x |
d043d8c2 | 1449 | { |
360fc44c | 1450 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 HWN |
1451 | SCM_VALIDATE_OPENPORT (1, port); |
1452 | SCM_VALIDATE_INUM (2, column); | |
564478fd GB |
1453 | SCM_PTAB_ENTRY (port)->column_number = SCM_INUM (column); |
1454 | return SCM_UNSPECIFIED; | |
d043d8c2 | 1455 | } |
1bbd0b84 | 1456 | #undef FUNC_NAME |
d043d8c2 | 1457 | |
a1ec6916 | 1458 | SCM_DEFINE (scm_port_filename, "port-filename", 1, 0, 0, |
1bbd0b84 | 1459 | (SCM port), |
b380b885 | 1460 | "Return the filename associated with @var{port}. This function returns\n" |
2a2a730b | 1461 | "the strings \"standard input\", \"standard output\" and \"standard error\"\n" |
a3c8b9fc | 1462 | "when called on the current input, output and error ports respectively.") |
1bbd0b84 | 1463 | #define FUNC_NAME s_scm_port_filename |
0f2d19dd | 1464 | { |
78446828 | 1465 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 1466 | SCM_VALIDATE_OPENPORT (1, port); |
b24b5e13 | 1467 | return SCM_FILENAME (port); |
0f2d19dd | 1468 | } |
1bbd0b84 | 1469 | #undef FUNC_NAME |
0f2d19dd | 1470 | |
a1ec6916 | 1471 | SCM_DEFINE (scm_set_port_filename_x, "set-port-filename!", 2, 0, 0, |
1bbd0b84 | 1472 | (SCM port, SCM filename), |
b380b885 MD |
1473 | "Change the filename associated with @var{port}, using the current input\n" |
1474 | "port if none is specified. Note that this does not change the port's\n" | |
1475 | "source of data, but only the value that is returned by\n" | |
1476 | "@code{port-filename} and reported in diagnostic output.") | |
1bbd0b84 | 1477 | #define FUNC_NAME s_scm_set_port_filename_x |
d14af9f2 | 1478 | { |
360fc44c | 1479 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 1480 | SCM_VALIDATE_OPENPORT (1, port); |
360fc44c | 1481 | /* We allow the user to set the filename to whatever he likes. */ |
b24b5e13 DH |
1482 | SCM_SET_FILENAME (port, filename); |
1483 | return SCM_UNSPECIFIED; | |
d14af9f2 | 1484 | } |
1bbd0b84 | 1485 | #undef FUNC_NAME |
d14af9f2 | 1486 | |
0f2d19dd JB |
1487 | #ifndef ttyname |
1488 | extern char * ttyname(); | |
1489 | #endif | |
1490 | ||
f12733c9 MD |
1491 | void |
1492 | scm_print_port_mode (SCM exp, SCM port) | |
1493 | { | |
1494 | scm_puts (SCM_CLOSEDP (exp) | |
1495 | ? "closed: " | |
f9a64404 DH |
1496 | : (SCM_RDNG & SCM_CELL_WORD_0 (exp) |
1497 | ? (SCM_WRTNG & SCM_CELL_WORD_0 (exp) | |
f12733c9 MD |
1498 | ? "input-output: " |
1499 | : "input: ") | |
f9a64404 | 1500 | : (SCM_WRTNG & SCM_CELL_WORD_0 (exp) |
f12733c9 MD |
1501 | ? "output: " |
1502 | : "bogus: ")), | |
1503 | port); | |
1504 | } | |
1cc91f1b | 1505 | |
f12733c9 | 1506 | int |
e81d98ec | 1507 | scm_port_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) |
0f2d19dd | 1508 | { |
f12733c9 MD |
1509 | char *type = SCM_PTOBNAME (SCM_PTOBNUM (exp)); |
1510 | if (!type) | |
1511 | type = "port"; | |
b7f3516f | 1512 | scm_puts ("#<", port); |
f12733c9 | 1513 | scm_print_port_mode (exp, port); |
b7f3516f TT |
1514 | scm_puts (type, port); |
1515 | scm_putc (' ', port); | |
12a8b769 | 1516 | scm_intprint (SCM_CELL_WORD_1 (exp), 16, port); |
b7f3516f | 1517 | scm_putc ('>', port); |
f12733c9 | 1518 | return 1; |
0f2d19dd JB |
1519 | } |
1520 | ||
0f2d19dd JB |
1521 | void |
1522 | scm_ports_prehistory () | |
0f2d19dd JB |
1523 | { |
1524 | scm_numptob = 0; | |
67329a9e | 1525 | scm_ptobs = (scm_t_ptob_descriptor *) scm_malloc (sizeof (scm_t_ptob_descriptor)); |
0f2d19dd | 1526 | } |
0f2d19dd JB |
1527 | |
1528 | \f | |
ee149d03 | 1529 | |
d68fee48 | 1530 | /* Void ports. */ |
0f2d19dd | 1531 | |
92c2555f | 1532 | scm_t_bits scm_tc16_void_port = 0; |
0f2d19dd | 1533 | |
e81d98ec | 1534 | static int fill_input_void_port (SCM port SCM_UNUSED) |
283a1a0e | 1535 | { |
70df8af6 | 1536 | return EOF; |
283a1a0e GH |
1537 | } |
1538 | ||
31703ab8 | 1539 | static void |
e81d98ec DH |
1540 | write_void_port (SCM port SCM_UNUSED, |
1541 | const void *data SCM_UNUSED, | |
1542 | size_t size SCM_UNUSED) | |
31703ab8 GH |
1543 | { |
1544 | } | |
1545 | ||
0f2d19dd | 1546 | SCM |
a284e297 | 1547 | scm_void_port (char *mode_str) |
0f2d19dd | 1548 | { |
0f2d19dd | 1549 | SCM_DEFER_INTS; |
402788a9 HWN |
1550 | { |
1551 | int mode_bits = scm_mode_bits (mode_str); | |
da220f27 HWN |
1552 | SCM answer = scm_new_port_table_entry (scm_tc16_void_port); |
1553 | scm_t_port * pt = SCM_PTAB_ENTRY(answer); | |
1554 | ||
402788a9 | 1555 | scm_port_non_buffer (pt); |
402788a9 HWN |
1556 | |
1557 | SCM_SETSTREAM (answer, 0); | |
1558 | SCM_SET_CELL_TYPE (answer, scm_tc16_void_port | mode_bits); | |
1559 | SCM_ALLOW_INTS; | |
1560 | return answer; | |
1561 | } | |
0f2d19dd JB |
1562 | } |
1563 | ||
a1ec6916 | 1564 | SCM_DEFINE (scm_sys_make_void_port, "%make-void-port", 1, 0, 0, |
1bbd0b84 | 1565 | (SCM mode), |
70df8af6 | 1566 | "Create and return a new void port. A void port acts like\n" |
bb2c02f2 | 1567 | "@file{/dev/null}. The @var{mode} argument\n" |
70df8af6 | 1568 | "specifies the input/output modes for this port: see the\n" |
b380b885 | 1569 | "documentation for @code{open-file} in @ref{File Ports}.") |
1bbd0b84 | 1570 | #define FUNC_NAME s_scm_sys_make_void_port |
0f2d19dd | 1571 | { |
a6d9e5ab | 1572 | SCM_VALIDATE_STRING (1, mode); |
a6d9e5ab | 1573 | return scm_void_port (SCM_STRING_CHARS (mode)); |
0f2d19dd | 1574 | } |
1bbd0b84 | 1575 | #undef FUNC_NAME |
0f2d19dd | 1576 | |
0f2d19dd | 1577 | \f |
89545eba | 1578 | /* Initialization. */ |
1cc91f1b | 1579 | |
0f2d19dd JB |
1580 | void |
1581 | scm_init_ports () | |
0f2d19dd | 1582 | { |
840ae05d | 1583 | /* lseek() symbols. */ |
86d31dfe MV |
1584 | scm_c_define ("SEEK_SET", SCM_MAKINUM (SEEK_SET)); |
1585 | scm_c_define ("SEEK_CUR", SCM_MAKINUM (SEEK_CUR)); | |
1586 | scm_c_define ("SEEK_END", SCM_MAKINUM (SEEK_END)); | |
840ae05d | 1587 | |
70df8af6 GH |
1588 | scm_tc16_void_port = scm_make_port_type ("void", fill_input_void_port, |
1589 | write_void_port); | |
a0599745 | 1590 | #include "libguile/ports.x" |
0f2d19dd | 1591 | } |
89e00824 ML |
1592 | |
1593 | /* | |
1594 | Local Variables: | |
1595 | c-file-style: "gnu" | |
1596 | End: | |
1597 | */ |