Commit | Line | Data |
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5bb2d903 | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2003, 2004, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
0f2d19dd | 2 | * |
73be1d9e | 3 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
4 | * modify it under the terms of the GNU Lesser General Public License |
5 | * as published by the Free Software Foundation; either version 3 of | |
6 | * the License, or (at your option) any later version. | |
0f2d19dd | 7 | * |
53befeb7 NJ |
8 | * This library is distributed in the hope that it will be useful, but |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * Lesser General Public License for more details. | |
0f2d19dd | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
16 | * 02110-1301 USA | |
73be1d9e | 17 | */ |
1bbd0b84 | 18 | |
1bbd0b84 | 19 | |
0f2d19dd | 20 | \f |
d68fee48 JB |
21 | /* Headers. */ |
22 | ||
2b829bbb KR |
23 | #define _LARGEFILE64_SOURCE /* ask for stat64 etc */ |
24 | ||
dbb605f5 | 25 | #ifdef HAVE_CONFIG_H |
bd515f37 RB |
26 | # include <config.h> |
27 | #endif | |
28 | ||
0f2d19dd | 29 | #include <stdio.h> |
e6e2e95a | 30 | #include <errno.h> |
8ab3d8a0 | 31 | #include <fcntl.h> /* for chsize on mingw */ |
b5cb4464 | 32 | #include <assert.h> |
e6e2e95a | 33 | |
a0599745 | 34 | #include "libguile/_scm.h" |
4e047c3e | 35 | #include "libguile/async.h" |
f0942910 | 36 | #include "libguile/eval.h" |
8ab3d8a0 | 37 | #include "libguile/fports.h" /* direct access for seek and truncate */ |
a0599745 | 38 | #include "libguile/objects.h" |
9511876f | 39 | #include "libguile/goops.h" |
a0599745 MD |
40 | #include "libguile/smob.h" |
41 | #include "libguile/chars.h" | |
185e369a | 42 | #include "libguile/dynwind.h" |
0f2d19dd | 43 | |
a0599745 | 44 | #include "libguile/keywords.h" |
5dbc6c06 | 45 | #include "libguile/hashtab.h" |
a0599745 MD |
46 | #include "libguile/root.h" |
47 | #include "libguile/strings.h" | |
b42170a4 | 48 | #include "libguile/mallocs.h" |
a0599745 MD |
49 | #include "libguile/validate.h" |
50 | #include "libguile/ports.h" | |
3a5fb14d | 51 | #include "libguile/vectors.h" |
5dbc6c06 | 52 | #include "libguile/weaks.h" |
9de87eea | 53 | #include "libguile/fluids.h" |
0f2d19dd | 54 | |
bd9e24b3 GH |
55 | #ifdef HAVE_STRING_H |
56 | #include <string.h> | |
57 | #endif | |
58 | ||
0f2d19dd | 59 | #ifdef HAVE_MALLOC_H |
95b88819 | 60 | #include <malloc.h> |
0f2d19dd JB |
61 | #endif |
62 | ||
ec65f5da MV |
63 | #ifdef HAVE_IO_H |
64 | #include <io.h> | |
65 | #endif | |
66 | ||
0f2d19dd JB |
67 | #ifdef HAVE_UNISTD_H |
68 | #include <unistd.h> | |
69 | #endif | |
70 | ||
95b88819 GH |
71 | #ifdef HAVE_SYS_IOCTL_H |
72 | #include <sys/ioctl.h> | |
73 | #endif | |
d68fee48 | 74 | |
8ab3d8a0 KR |
75 | /* Mingw (version 3.4.5, circa 2006) has ftruncate as an alias for chsize |
76 | already, but have this code here in case that wasn't so in past versions, | |
77 | or perhaps to help other minimal DOS environments. | |
78 | ||
79 | gnulib ftruncate.c has code using fcntl F_CHSIZE and F_FREESP, which | |
80 | might be possibilities if we've got other systems without ftruncate. */ | |
81 | ||
82 | #if HAVE_CHSIZE && ! HAVE_FTRUNCATE | |
82893676 | 83 | #define ftruncate(fd, size) chsize (fd, size) |
8ab3d8a0 KR |
84 | #undef HAVE_FTRUNCATE |
85 | #define HAVE_FTRUNCATE 1 | |
82893676 MG |
86 | #endif |
87 | ||
0f2d19dd | 88 | \f |
d68fee48 | 89 | /* The port kind table --- a dynamically resized array of port types. */ |
0f2d19dd JB |
90 | |
91 | ||
92 | /* scm_ptobs scm_numptob | |
5dbc6c06 | 93 | * implement a dynamically resized array of ptob records. |
0f2d19dd JB |
94 | * Indexes into this table are used when generating type |
95 | * tags for smobjects (if you know a tag you can get an index and conversely). | |
96 | */ | |
92c2555f | 97 | scm_t_ptob_descriptor *scm_ptobs; |
c014a02e | 98 | long scm_numptob; |
0f2d19dd | 99 | |
ee149d03 | 100 | /* GC marker for a port with stream of SCM type. */ |
0f2d19dd | 101 | SCM |
a284e297 | 102 | scm_markstream (SCM ptr) |
0f2d19dd JB |
103 | { |
104 | int openp; | |
f9a64404 | 105 | openp = SCM_CELL_WORD_0 (ptr) & SCM_OPN; |
0f2d19dd | 106 | if (openp) |
74a16888 | 107 | return SCM_PACK (SCM_STREAM (ptr)); |
0f2d19dd JB |
108 | else |
109 | return SCM_BOOL_F; | |
110 | } | |
111 | ||
f12733c9 | 112 | /* |
f12733c9 | 113 | * We choose to use an interface similar to the smob interface with |
affc96b5 | 114 | * fill_input and write as standard fields, passed to the port |
f12733c9 MD |
115 | * type constructor, and optional fields set by setters. |
116 | */ | |
117 | ||
70df8af6 | 118 | static void |
e81d98ec | 119 | flush_port_default (SCM port SCM_UNUSED) |
70df8af6 GH |
120 | { |
121 | } | |
122 | ||
123 | static void | |
e81d98ec | 124 | end_input_default (SCM port SCM_UNUSED, int offset SCM_UNUSED) |
70df8af6 GH |
125 | { |
126 | } | |
0f2d19dd | 127 | |
4c9419ac MV |
128 | static size_t |
129 | scm_port_free0 (SCM port) | |
130 | { | |
131 | return 0; | |
132 | } | |
133 | ||
92c2555f | 134 | scm_t_bits |
f12733c9 | 135 | scm_make_port_type (char *name, |
affc96b5 | 136 | int (*fill_input) (SCM port), |
8aa011a1 | 137 | void (*write) (SCM port, const void *data, size_t size)) |
0f2d19dd JB |
138 | { |
139 | char *tmp; | |
5bb2d903 | 140 | if (SCM_I_MAX_PORT_TYPE_COUNT - 1 <= scm_numptob) |
0f2d19dd | 141 | goto ptoberr; |
9de87eea | 142 | SCM_CRITICAL_SECTION_START; |
f12733c9 MD |
143 | SCM_SYSCALL (tmp = (char *) realloc ((char *) scm_ptobs, |
144 | (1 + scm_numptob) | |
92c2555f | 145 | * sizeof (scm_t_ptob_descriptor))); |
0f2d19dd JB |
146 | if (tmp) |
147 | { | |
92c2555f | 148 | scm_ptobs = (scm_t_ptob_descriptor *) tmp; |
affc96b5 | 149 | |
f12733c9 MD |
150 | scm_ptobs[scm_numptob].name = name; |
151 | scm_ptobs[scm_numptob].mark = 0; | |
4c9419ac | 152 | scm_ptobs[scm_numptob].free = scm_port_free0; |
f12733c9 MD |
153 | scm_ptobs[scm_numptob].print = scm_port_print; |
154 | scm_ptobs[scm_numptob].equalp = 0; | |
affc96b5 GH |
155 | scm_ptobs[scm_numptob].close = 0; |
156 | ||
157 | scm_ptobs[scm_numptob].write = write; | |
70df8af6 | 158 | scm_ptobs[scm_numptob].flush = flush_port_default; |
affc96b5 | 159 | |
70df8af6 | 160 | scm_ptobs[scm_numptob].end_input = end_input_default; |
affc96b5 GH |
161 | scm_ptobs[scm_numptob].fill_input = fill_input; |
162 | scm_ptobs[scm_numptob].input_waiting = 0; | |
163 | ||
f12733c9 | 164 | scm_ptobs[scm_numptob].seek = 0; |
affc96b5 GH |
165 | scm_ptobs[scm_numptob].truncate = 0; |
166 | ||
0f2d19dd JB |
167 | scm_numptob++; |
168 | } | |
9de87eea | 169 | SCM_CRITICAL_SECTION_END; |
0f2d19dd | 170 | if (!tmp) |
2500356c DH |
171 | { |
172 | ptoberr: | |
173 | scm_memory_error ("scm_make_port_type"); | |
174 | } | |
f12733c9 | 175 | /* Make a class object if Goops is present */ |
6290d3f1 | 176 | if (SCM_UNPACK (scm_port_class[0]) != 0) |
f12733c9 | 177 | scm_make_port_classes (scm_numptob - 1, SCM_PTOBNAME (scm_numptob - 1)); |
0f2d19dd JB |
178 | return scm_tc7_port + (scm_numptob - 1) * 256; |
179 | } | |
180 | ||
f12733c9 | 181 | void |
23f2b9a3 | 182 | scm_set_port_mark (scm_t_bits tc, SCM (*mark) (SCM)) |
f12733c9 MD |
183 | { |
184 | scm_ptobs[SCM_TC2PTOBNUM (tc)].mark = mark; | |
185 | } | |
186 | ||
187 | void | |
23f2b9a3 | 188 | scm_set_port_free (scm_t_bits tc, size_t (*free) (SCM)) |
f12733c9 MD |
189 | { |
190 | scm_ptobs[SCM_TC2PTOBNUM (tc)].free = free; | |
191 | } | |
192 | ||
193 | void | |
23f2b9a3 | 194 | scm_set_port_print (scm_t_bits tc, int (*print) (SCM exp, SCM port, |
f12733c9 MD |
195 | scm_print_state *pstate)) |
196 | { | |
197 | scm_ptobs[SCM_TC2PTOBNUM (tc)].print = print; | |
198 | } | |
199 | ||
200 | void | |
23f2b9a3 | 201 | scm_set_port_equalp (scm_t_bits tc, SCM (*equalp) (SCM, SCM)) |
f12733c9 MD |
202 | { |
203 | scm_ptobs[SCM_TC2PTOBNUM (tc)].equalp = equalp; | |
204 | } | |
205 | ||
31703ab8 | 206 | void |
23f2b9a3 | 207 | scm_set_port_flush (scm_t_bits tc, void (*flush) (SCM port)) |
31703ab8 | 208 | { |
affc96b5 | 209 | scm_ptobs[SCM_TC2PTOBNUM (tc)].flush = flush; |
31703ab8 GH |
210 | } |
211 | ||
f12733c9 | 212 | void |
23f2b9a3 | 213 | scm_set_port_end_input (scm_t_bits tc, void (*end_input) (SCM port, int offset)) |
f12733c9 | 214 | { |
affc96b5 | 215 | scm_ptobs[SCM_TC2PTOBNUM (tc)].end_input = end_input; |
f12733c9 MD |
216 | } |
217 | ||
218 | void | |
23f2b9a3 | 219 | scm_set_port_close (scm_t_bits tc, int (*close) (SCM)) |
f12733c9 | 220 | { |
affc96b5 | 221 | scm_ptobs[SCM_TC2PTOBNUM (tc)].close = close; |
f12733c9 MD |
222 | } |
223 | ||
224 | void | |
f1ce9199 LC |
225 | scm_set_port_seek (scm_t_bits tc, |
226 | scm_t_off (*seek) (SCM, scm_t_off, int)) | |
f12733c9 MD |
227 | { |
228 | scm_ptobs[SCM_TC2PTOBNUM (tc)].seek = seek; | |
229 | } | |
230 | ||
231 | void | |
f1ce9199 | 232 | scm_set_port_truncate (scm_t_bits tc, void (*truncate) (SCM, scm_t_off)) |
f12733c9 | 233 | { |
affc96b5 | 234 | scm_ptobs[SCM_TC2PTOBNUM (tc)].truncate = truncate; |
f12733c9 MD |
235 | } |
236 | ||
237 | void | |
23f2b9a3 | 238 | scm_set_port_input_waiting (scm_t_bits tc, int (*input_waiting) (SCM)) |
f12733c9 | 239 | { |
affc96b5 | 240 | scm_ptobs[SCM_TC2PTOBNUM (tc)].input_waiting = input_waiting; |
f12733c9 MD |
241 | } |
242 | ||
0f2d19dd | 243 | \f |
0f2d19dd | 244 | |
3b3b36dd | 245 | SCM_DEFINE (scm_char_ready_p, "char-ready?", 0, 1, 0, |
1e6808ea MG |
246 | (SCM port), |
247 | "Return @code{#t} if a character is ready on input @var{port}\n" | |
248 | "and return @code{#f} otherwise. If @code{char-ready?} returns\n" | |
249 | "@code{#t} then the next @code{read-char} operation on\n" | |
250 | "@var{port} is guaranteed not to hang. If @var{port} is a file\n" | |
251 | "port at end of file then @code{char-ready?} returns @code{#t}.\n" | |
c2dfff19 KR |
252 | "\n" |
253 | "@code{char-ready?} exists to make it possible for a\n" | |
1e6808ea MG |
254 | "program to accept characters from interactive ports without\n" |
255 | "getting stuck waiting for input. Any input editors associated\n" | |
256 | "with such ports must make sure that characters whose existence\n" | |
257 | "has been asserted by @code{char-ready?} cannot be rubbed out.\n" | |
258 | "If @code{char-ready?} were to return @code{#f} at end of file,\n" | |
259 | "a port at end of file would be indistinguishable from an\n" | |
c2dfff19 | 260 | "interactive port that has no ready characters.") |
1bbd0b84 | 261 | #define FUNC_NAME s_scm_char_ready_p |
0f2d19dd | 262 | { |
92c2555f | 263 | scm_t_port *pt; |
6c951427 | 264 | |
0f2d19dd | 265 | if (SCM_UNBNDP (port)) |
9de87eea | 266 | port = scm_current_input_port (); |
0f2d19dd | 267 | else |
34d19ef6 | 268 | SCM_VALIDATE_OPINPORT (1, port); |
d68fee48 | 269 | |
ae4c4016 JB |
270 | pt = SCM_PTAB_ENTRY (port); |
271 | ||
6c951427 GH |
272 | /* if the current read buffer is filled, or the |
273 | last pushed-back char has been read and the saved buffer is | |
274 | filled, result is true. */ | |
275 | if (pt->read_pos < pt->read_end | |
276 | || (pt->read_buf == pt->putback_buf | |
277 | && pt->saved_read_pos < pt->saved_read_end)) | |
0f2d19dd | 278 | return SCM_BOOL_T; |
ee149d03 JB |
279 | else |
280 | { | |
92c2555f | 281 | scm_t_ptob_descriptor *ptob = &scm_ptobs[SCM_PTOBNUM (port)]; |
ee149d03 | 282 | |
affc96b5 | 283 | if (ptob->input_waiting) |
7888309b | 284 | return scm_from_bool(ptob->input_waiting (port)); |
ee149d03 | 285 | else |
6c951427 | 286 | return SCM_BOOL_T; |
ee149d03 | 287 | } |
0f2d19dd | 288 | } |
1bbd0b84 | 289 | #undef FUNC_NAME |
0f2d19dd | 290 | |
c2da2648 GH |
291 | /* move up to read_len chars from port's putback and/or read buffers |
292 | into memory starting at dest. returns the number of chars moved. */ | |
293 | size_t scm_take_from_input_buffers (SCM port, char *dest, size_t read_len) | |
294 | { | |
92c2555f | 295 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
c2da2648 GH |
296 | size_t chars_read = 0; |
297 | size_t from_buf = min (pt->read_end - pt->read_pos, read_len); | |
298 | ||
299 | if (from_buf > 0) | |
300 | { | |
301 | memcpy (dest, pt->read_pos, from_buf); | |
302 | pt->read_pos += from_buf; | |
303 | chars_read += from_buf; | |
304 | read_len -= from_buf; | |
305 | dest += from_buf; | |
306 | } | |
307 | ||
308 | /* if putback was active, try the real input buffer too. */ | |
309 | if (pt->read_buf == pt->putback_buf) | |
310 | { | |
311 | from_buf = min (pt->saved_read_end - pt->saved_read_pos, read_len); | |
312 | if (from_buf > 0) | |
313 | { | |
314 | memcpy (dest, pt->saved_read_pos, from_buf); | |
315 | pt->saved_read_pos += from_buf; | |
316 | chars_read += from_buf; | |
317 | } | |
318 | } | |
319 | return chars_read; | |
320 | } | |
321 | ||
6c951427 | 322 | /* Clear a port's read buffers, returning the contents. */ |
a1ec6916 | 323 | SCM_DEFINE (scm_drain_input, "drain-input", 1, 0, 0, |
1bbd0b84 | 324 | (SCM port), |
4a151b3d GH |
325 | "This procedure clears a port's input buffers, similar\n" |
326 | "to the way that force-output clears the output buffer. The\n" | |
327 | "contents of the buffers are returned as a single string, e.g.,\n" | |
328 | "\n" | |
329 | "@lisp\n" | |
330 | "(define p (open-input-file ...))\n" | |
331 | "(drain-input p) => empty string, nothing buffered yet.\n" | |
332 | "(unread-char (read-char p) p)\n" | |
333 | "(drain-input p) => initial chars from p, up to the buffer size.\n" | |
334 | "@end lisp\n\n" | |
335 | "Draining the buffers may be useful for cleanly finishing\n" | |
336 | "buffered I/O so that the file descriptor can be used directly\n" | |
337 | "for further input.") | |
1bbd0b84 | 338 | #define FUNC_NAME s_scm_drain_input |
ee149d03 | 339 | { |
840ae05d | 340 | SCM result; |
3a5fb14d | 341 | char *data; |
28a6e1b0 | 342 | scm_t_port *pt; |
c014a02e | 343 | long count; |
ee149d03 | 344 | |
34d19ef6 | 345 | SCM_VALIDATE_OPINPORT (1, port); |
28a6e1b0 | 346 | pt = SCM_PTAB_ENTRY (port); |
840ae05d | 347 | |
6c951427 GH |
348 | count = pt->read_end - pt->read_pos; |
349 | if (pt->read_buf == pt->putback_buf) | |
350 | count += pt->saved_read_end - pt->saved_read_pos; | |
840ae05d | 351 | |
3a5fb14d MV |
352 | result = scm_i_make_string (count, &data); |
353 | scm_take_from_input_buffers (port, data, count); | |
840ae05d | 354 | return result; |
ee149d03 | 355 | } |
1bbd0b84 | 356 | #undef FUNC_NAME |
0f2d19dd JB |
357 | |
358 | \f | |
d68fee48 | 359 | /* Standard ports --- current input, output, error, and more(!). */ |
0f2d19dd | 360 | |
9de87eea MV |
361 | static SCM cur_inport_fluid; |
362 | static SCM cur_outport_fluid; | |
363 | static SCM cur_errport_fluid; | |
364 | static SCM cur_loadport_fluid; | |
365 | ||
3b3b36dd | 366 | SCM_DEFINE (scm_current_input_port, "current-input-port", 0, 0, 0, |
e1546b65 MG |
367 | (), |
368 | "Return the current input port. This is the default port used\n" | |
369 | "by many input procedures. Initially, @code{current-input-port}\n" | |
370 | "returns the @dfn{standard input} in Unix and C terminology.") | |
1bbd0b84 | 371 | #define FUNC_NAME s_scm_current_input_port |
0f2d19dd | 372 | { |
9de87eea | 373 | return scm_fluid_ref (cur_inport_fluid); |
0f2d19dd | 374 | } |
1bbd0b84 | 375 | #undef FUNC_NAME |
0f2d19dd | 376 | |
3b3b36dd | 377 | SCM_DEFINE (scm_current_output_port, "current-output-port", 0, 0, 0, |
e1546b65 MG |
378 | (), |
379 | "Return the current output port. This is the default port used\n" | |
9401323e | 380 | "by many output procedures. Initially,\n" |
e1546b65 MG |
381 | "@code{current-output-port} returns the @dfn{standard output} in\n" |
382 | "Unix and C terminology.") | |
1bbd0b84 | 383 | #define FUNC_NAME s_scm_current_output_port |
0f2d19dd | 384 | { |
9de87eea | 385 | return scm_fluid_ref (cur_outport_fluid); |
0f2d19dd | 386 | } |
1bbd0b84 | 387 | #undef FUNC_NAME |
0f2d19dd | 388 | |
3b3b36dd | 389 | SCM_DEFINE (scm_current_error_port, "current-error-port", 0, 0, 0, |
1bbd0b84 | 390 | (), |
b380b885 MD |
391 | "Return the port to which errors and warnings should be sent (the\n" |
392 | "@dfn{standard error} in Unix and C terminology).") | |
1bbd0b84 | 393 | #define FUNC_NAME s_scm_current_error_port |
0f2d19dd | 394 | { |
9de87eea | 395 | return scm_fluid_ref (cur_errport_fluid); |
0f2d19dd | 396 | } |
1bbd0b84 | 397 | #undef FUNC_NAME |
0f2d19dd | 398 | |
3b3b36dd | 399 | SCM_DEFINE (scm_current_load_port, "current-load-port", 0, 0, 0, |
e1546b65 | 400 | (), |
b450f070 | 401 | "Return the current-load-port.\n" |
e1546b65 | 402 | "The load port is used internally by @code{primitive-load}.") |
1bbd0b84 | 403 | #define FUNC_NAME s_scm_current_load_port |
31614d8e | 404 | { |
9de87eea | 405 | return scm_fluid_ref (cur_loadport_fluid); |
31614d8e | 406 | } |
1bbd0b84 | 407 | #undef FUNC_NAME |
31614d8e | 408 | |
3b3b36dd | 409 | SCM_DEFINE (scm_set_current_input_port, "set-current-input-port", 1, 0, 0, |
1bbd0b84 | 410 | (SCM port), |
8f85c0c6 NJ |
411 | "@deffnx {Scheme Procedure} set-current-output-port port\n" |
412 | "@deffnx {Scheme Procedure} set-current-error-port port\n" | |
b380b885 MD |
413 | "Change the ports returned by @code{current-input-port},\n" |
414 | "@code{current-output-port} and @code{current-error-port}, respectively,\n" | |
415 | "so that they use the supplied @var{port} for input or output.") | |
1bbd0b84 | 416 | #define FUNC_NAME s_scm_set_current_input_port |
0f2d19dd | 417 | { |
9de87eea | 418 | SCM oinp = scm_fluid_ref (cur_inport_fluid); |
34d19ef6 | 419 | SCM_VALIDATE_OPINPORT (1, port); |
9de87eea | 420 | scm_fluid_set_x (cur_inport_fluid, port); |
0f2d19dd JB |
421 | return oinp; |
422 | } | |
1bbd0b84 | 423 | #undef FUNC_NAME |
0f2d19dd JB |
424 | |
425 | ||
3b3b36dd | 426 | SCM_DEFINE (scm_set_current_output_port, "set-current-output-port", 1, 0, 0, |
e1546b65 MG |
427 | (SCM port), |
428 | "Set the current default output port to @var{port}.") | |
1bbd0b84 | 429 | #define FUNC_NAME s_scm_set_current_output_port |
0f2d19dd | 430 | { |
9de87eea | 431 | SCM ooutp = scm_fluid_ref (cur_outport_fluid); |
78446828 | 432 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 433 | SCM_VALIDATE_OPOUTPORT (1, port); |
9de87eea | 434 | scm_fluid_set_x (cur_outport_fluid, port); |
0f2d19dd JB |
435 | return ooutp; |
436 | } | |
1bbd0b84 | 437 | #undef FUNC_NAME |
0f2d19dd JB |
438 | |
439 | ||
3b3b36dd | 440 | SCM_DEFINE (scm_set_current_error_port, "set-current-error-port", 1, 0, 0, |
e1546b65 MG |
441 | (SCM port), |
442 | "Set the current default error port to @var{port}.") | |
1bbd0b84 | 443 | #define FUNC_NAME s_scm_set_current_error_port |
0f2d19dd | 444 | { |
9de87eea | 445 | SCM oerrp = scm_fluid_ref (cur_errport_fluid); |
78446828 | 446 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 447 | SCM_VALIDATE_OPOUTPORT (1, port); |
9de87eea | 448 | scm_fluid_set_x (cur_errport_fluid, port); |
0f2d19dd JB |
449 | return oerrp; |
450 | } | |
1bbd0b84 | 451 | #undef FUNC_NAME |
0f2d19dd | 452 | |
185e369a | 453 | void |
661ae7ab | 454 | scm_dynwind_current_input_port (SCM port) |
9de87eea | 455 | #define FUNC_NAME NULL |
185e369a | 456 | { |
9de87eea | 457 | SCM_VALIDATE_OPINPORT (1, port); |
661ae7ab | 458 | scm_dynwind_fluid (cur_inport_fluid, port); |
185e369a | 459 | } |
9de87eea | 460 | #undef FUNC_NAME |
185e369a MV |
461 | |
462 | void | |
661ae7ab | 463 | scm_dynwind_current_output_port (SCM port) |
9de87eea | 464 | #define FUNC_NAME NULL |
185e369a | 465 | { |
9de87eea MV |
466 | port = SCM_COERCE_OUTPORT (port); |
467 | SCM_VALIDATE_OPOUTPORT (1, port); | |
661ae7ab | 468 | scm_dynwind_fluid (cur_outport_fluid, port); |
185e369a | 469 | } |
9de87eea | 470 | #undef FUNC_NAME |
185e369a MV |
471 | |
472 | void | |
661ae7ab | 473 | scm_dynwind_current_error_port (SCM port) |
9de87eea MV |
474 | #define FUNC_NAME NULL |
475 | { | |
476 | port = SCM_COERCE_OUTPORT (port); | |
477 | SCM_VALIDATE_OPOUTPORT (1, port); | |
661ae7ab | 478 | scm_dynwind_fluid (cur_errport_fluid, port); |
9de87eea MV |
479 | } |
480 | #undef FUNC_NAME | |
481 | ||
482 | void | |
661ae7ab | 483 | scm_i_dynwind_current_load_port (SCM port) |
185e369a | 484 | { |
661ae7ab | 485 | scm_dynwind_fluid (cur_loadport_fluid, port); |
185e369a MV |
486 | } |
487 | ||
0f2d19dd | 488 | \f |
840ae05d | 489 | /* The port table --- an array of pointers to ports. */ |
0f2d19dd | 490 | |
5dbc6c06 HWN |
491 | /* |
492 | We need a global registry of ports to flush them all at exit, and to | |
493 | get all the ports matching a file descriptor. | |
494 | */ | |
495 | SCM scm_i_port_weak_hash; | |
0f2d19dd | 496 | |
9de87eea | 497 | scm_i_pthread_mutex_t scm_i_port_table_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
b9ad392e MD |
498 | |
499 | /* This function is not and should not be thread safe. */ | |
1cc91f1b | 500 | |
da220f27 HWN |
501 | SCM |
502 | scm_new_port_table_entry (scm_t_bits tag) | |
402788a9 | 503 | #define FUNC_NAME "scm_new_port_table_entry" |
0f2d19dd | 504 | { |
85835e59 HWN |
505 | /* |
506 | We initialize the cell to empty, this is in case scm_gc_calloc | |
507 | triggers GC ; we don't want the GC to scan a half-finished Z. | |
508 | */ | |
509 | ||
67329a9e | 510 | SCM z = scm_cons (SCM_EOL, SCM_EOL); |
39e8f371 | 511 | scm_t_port *entry = (scm_t_port *) scm_gc_calloc (sizeof (scm_t_port), "port"); |
5f16b897 | 512 | |
840ae05d | 513 | entry->file_name = SCM_BOOL_F; |
61e452ba | 514 | entry->rw_active = SCM_PORT_NEITHER; |
5dbc6c06 | 515 | entry->port = z; |
5f16b897 | 516 | |
5dbc6c06 HWN |
517 | SCM_SET_CELL_TYPE (z, tag); |
518 | SCM_SETPTAB_ENTRY (z, entry); | |
519 | ||
520 | scm_hashq_set_x (scm_i_port_weak_hash, z, SCM_BOOL_F); | |
840ae05d | 521 | |
da220f27 | 522 | return z; |
0f2d19dd | 523 | } |
c6c79933 | 524 | #undef FUNC_NAME |
0f2d19dd | 525 | |
67329a9e HWN |
526 | #if SCM_ENABLE_DEPRECATED==1 |
527 | SCM_API scm_t_port * | |
528 | scm_add_to_port_table (SCM port) | |
529 | { | |
530 | SCM z = scm_new_port_table_entry (scm_tc7_port); | |
531 | scm_t_port * pt = SCM_PTAB_ENTRY(z); | |
532 | ||
533 | pt->port = port; | |
5dbc6c06 HWN |
534 | SCM_SETCAR (z, SCM_EOL); |
535 | SCM_SETCDR (z, SCM_EOL); | |
85835e59 | 536 | SCM_SETPTAB_ENTRY (port, pt); |
67329a9e HWN |
537 | return pt; |
538 | } | |
539 | #endif | |
540 | ||
541 | ||
6c951427 | 542 | /* Remove a port from the table and destroy it. */ |
b9ad392e MD |
543 | |
544 | /* This function is not and should not be thread safe. */ | |
0f2d19dd | 545 | void |
5dbc6c06 HWN |
546 | scm_i_remove_port (SCM port) |
547 | #define FUNC_NAME "scm_remove_port" | |
0f2d19dd | 548 | { |
92c2555f | 549 | scm_t_port *p = SCM_PTAB_ENTRY (port); |
6c951427 | 550 | if (p->putback_buf) |
4c9419ac MV |
551 | scm_gc_free (p->putback_buf, p->putback_buf_size, "putback buffer"); |
552 | scm_gc_free (p, sizeof (scm_t_port), "port"); | |
5dbc6c06 | 553 | |
0f2d19dd | 554 | SCM_SETPTAB_ENTRY (port, 0); |
5dbc6c06 | 555 | scm_hashq_remove_x (scm_i_port_weak_hash, port); |
0f2d19dd | 556 | } |
db4b4ca6 DH |
557 | #undef FUNC_NAME |
558 | ||
0f2d19dd | 559 | |
b450f070 | 560 | /* Functions for debugging. */ |
5dbc6c06 | 561 | #ifdef GUILE_DEBUG |
3b3b36dd | 562 | SCM_DEFINE (scm_pt_size, "pt-size", 0, 0, 0, |
b450f070 | 563 | (), |
1e6808ea | 564 | "Return the number of ports in the port table. @code{pt-size}\n" |
5352393c | 565 | "is only included in @code{--enable-guile-debug} builds.") |
1bbd0b84 | 566 | #define FUNC_NAME s_scm_pt_size |
0f2d19dd | 567 | { |
5dbc6c06 | 568 | return scm_from_int (SCM_HASHTABLE_N_ITEMS (scm_i_port_weak_hash)); |
0f2d19dd | 569 | } |
1bbd0b84 | 570 | #undef FUNC_NAME |
0f2d19dd JB |
571 | #endif |
572 | ||
70df8af6 | 573 | void |
92c2555f | 574 | scm_port_non_buffer (scm_t_port *pt) |
70df8af6 GH |
575 | { |
576 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; | |
577 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
578 | pt->read_buf_size = pt->write_buf_size = 1; | |
579 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
580 | } | |
0f2d19dd | 581 | |
d68fee48 JB |
582 | \f |
583 | /* Revealed counts --- an oddity inherited from SCSH. */ | |
584 | ||
8b13c6b3 GH |
585 | /* Find a port in the table and return its revealed count. |
586 | Also used by the garbage collector. | |
0f2d19dd | 587 | */ |
1cc91f1b | 588 | |
0f2d19dd | 589 | int |
a284e297 | 590 | scm_revealed_count (SCM port) |
0f2d19dd JB |
591 | { |
592 | return SCM_REVEALED(port); | |
593 | } | |
594 | ||
595 | ||
596 | ||
597 | /* Return the revealed count for a port. */ | |
598 | ||
3b3b36dd | 599 | SCM_DEFINE (scm_port_revealed, "port-revealed", 1, 0, 0, |
1bbd0b84 | 600 | (SCM port), |
1e6808ea | 601 | "Return the revealed count for @var{port}.") |
1bbd0b84 | 602 | #define FUNC_NAME s_scm_port_revealed |
0f2d19dd | 603 | { |
78446828 | 604 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 605 | SCM_VALIDATE_OPENPORT (1, port); |
e11e83f3 | 606 | return scm_from_int (scm_revealed_count (port)); |
0f2d19dd | 607 | } |
1bbd0b84 | 608 | #undef FUNC_NAME |
0f2d19dd JB |
609 | |
610 | /* Set the revealed count for a port. */ | |
3b3b36dd | 611 | SCM_DEFINE (scm_set_port_revealed_x, "set-port-revealed!", 2, 0, 0, |
1bbd0b84 | 612 | (SCM port, SCM rcount), |
b450f070 | 613 | "Sets the revealed count for a port to a given value.\n" |
b380b885 | 614 | "The return value is unspecified.") |
1bbd0b84 | 615 | #define FUNC_NAME s_scm_set_port_revealed_x |
0f2d19dd | 616 | { |
78446828 | 617 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 618 | SCM_VALIDATE_OPENPORT (1, port); |
a55c2b68 | 619 | SCM_REVEALED (port) = scm_to_int (rcount); |
8b13c6b3 | 620 | return SCM_UNSPECIFIED; |
0f2d19dd | 621 | } |
1bbd0b84 | 622 | #undef FUNC_NAME |
0f2d19dd | 623 | |
d68fee48 JB |
624 | |
625 | \f | |
626 | /* Retrieving a port's mode. */ | |
627 | ||
eadd48de GH |
628 | /* Return the flags that characterize a port based on the mode |
629 | * string used to open a file for that port. | |
630 | * | |
631 | * See PORT FLAGS in scm.h | |
632 | */ | |
633 | ||
3a5fb14d MV |
634 | static long |
635 | scm_i_mode_bits_n (const char *modes, size_t n) | |
636 | { | |
637 | return (SCM_OPN | |
638 | | (memchr (modes, 'r', n) || memchr (modes, '+', n) ? SCM_RDNG : 0) | |
639 | | ( memchr (modes, 'w', n) | |
640 | || memchr (modes, 'a', n) | |
641 | || memchr (modes, '+', n) ? SCM_WRTNG : 0) | |
642 | | (memchr (modes, '0', n) ? SCM_BUF0 : 0) | |
643 | | (memchr (modes, 'l', n) ? SCM_BUFLINE : 0)); | |
644 | } | |
645 | ||
eadd48de | 646 | long |
a284e297 | 647 | scm_mode_bits (char *modes) |
eadd48de | 648 | { |
3a5fb14d | 649 | return scm_i_mode_bits_n (modes, strlen (modes)); |
eadd48de GH |
650 | } |
651 | ||
d617ee18 MV |
652 | long |
653 | scm_i_mode_bits (SCM modes) | |
654 | { | |
655 | long bits; | |
656 | ||
657 | if (!scm_is_string (modes)) | |
658 | scm_wrong_type_arg_msg (NULL, 0, modes, "string"); | |
659 | ||
3a5fb14d MV |
660 | bits = scm_i_mode_bits_n (scm_i_string_chars (modes), |
661 | scm_i_string_length (modes)); | |
d617ee18 MV |
662 | scm_remember_upto_here_1 (modes); |
663 | return bits; | |
664 | } | |
eadd48de GH |
665 | |
666 | /* Return the mode flags from an open port. | |
667 | * Some modes such as "append" are only used when opening | |
668 | * a file and are not returned here. */ | |
669 | ||
3b3b36dd | 670 | SCM_DEFINE (scm_port_mode, "port-mode", 1, 0, 0, |
1bbd0b84 | 671 | (SCM port), |
1e6808ea MG |
672 | "Return the port modes associated with the open port @var{port}.\n" |
673 | "These will not necessarily be identical to the modes used when\n" | |
674 | "the port was opened, since modes such as \"append\" which are\n" | |
675 | "used only during port creation are not retained.") | |
1bbd0b84 | 676 | #define FUNC_NAME s_scm_port_mode |
eadd48de | 677 | { |
26a3038d | 678 | char modes[4]; |
eadd48de | 679 | modes[0] = '\0'; |
78446828 MV |
680 | |
681 | port = SCM_COERCE_OUTPORT (port); | |
34d19ef6 | 682 | SCM_VALIDATE_OPPORT (1, port); |
f9a64404 DH |
683 | if (SCM_CELL_WORD_0 (port) & SCM_RDNG) { |
684 | if (SCM_CELL_WORD_0 (port) & SCM_WRTNG) | |
eadd48de GH |
685 | strcpy (modes, "r+"); |
686 | else | |
687 | strcpy (modes, "r"); | |
688 | } | |
f9a64404 | 689 | else if (SCM_CELL_WORD_0 (port) & SCM_WRTNG) |
eadd48de | 690 | strcpy (modes, "w"); |
f9a64404 | 691 | if (SCM_CELL_WORD_0 (port) & SCM_BUF0) |
eadd48de | 692 | strcat (modes, "0"); |
3a5fb14d | 693 | return scm_from_locale_string (modes); |
eadd48de | 694 | } |
1bbd0b84 | 695 | #undef FUNC_NAME |
eadd48de GH |
696 | |
697 | ||
d68fee48 JB |
698 | \f |
699 | /* Closing ports. */ | |
700 | ||
0f2d19dd JB |
701 | /* scm_close_port |
702 | * Call the close operation on a port object. | |
eadd48de | 703 | * see also scm_close. |
0f2d19dd | 704 | */ |
3b3b36dd | 705 | SCM_DEFINE (scm_close_port, "close-port", 1, 0, 0, |
1bbd0b84 | 706 | (SCM port), |
1e6808ea MG |
707 | "Close the specified port object. Return @code{#t} if it\n" |
708 | "successfully closes a port or @code{#f} if it was already\n" | |
709 | "closed. An exception may be raised if an error occurs, for\n" | |
710 | "example when flushing buffered output. See also @ref{Ports and\n" | |
711 | "File Descriptors, close}, for a procedure which can close file\n" | |
712 | "descriptors.") | |
1bbd0b84 | 713 | #define FUNC_NAME s_scm_close_port |
0f2d19dd | 714 | { |
1be6b49c | 715 | size_t i; |
eadd48de GH |
716 | int rv; |
717 | ||
78446828 MV |
718 | port = SCM_COERCE_OUTPORT (port); |
719 | ||
7a754ca6 | 720 | SCM_VALIDATE_PORT (1, port); |
0f2d19dd | 721 | if (SCM_CLOSEDP (port)) |
eadd48de | 722 | return SCM_BOOL_F; |
0f2d19dd | 723 | i = SCM_PTOBNUM (port); |
affc96b5 GH |
724 | if (scm_ptobs[i].close) |
725 | rv = (scm_ptobs[i].close) (port); | |
eadd48de GH |
726 | else |
727 | rv = 0; | |
9de87eea | 728 | scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex); |
5dbc6c06 | 729 | scm_i_remove_port (port); |
9de87eea | 730 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
22a52da1 | 731 | SCM_CLR_PORT_OPEN_FLAG (port); |
7888309b | 732 | return scm_from_bool (rv >= 0); |
7a754ca6 MD |
733 | } |
734 | #undef FUNC_NAME | |
735 | ||
736 | SCM_DEFINE (scm_close_input_port, "close-input-port", 1, 0, 0, | |
737 | (SCM port), | |
738 | "Close the specified input port object. The routine has no effect if\n" | |
739 | "the file has already been closed. An exception may be raised if an\n" | |
740 | "error occurs. The value returned is unspecified.\n\n" | |
741 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" | |
742 | "which can close file descriptors.") | |
743 | #define FUNC_NAME s_scm_close_input_port | |
744 | { | |
745 | SCM_VALIDATE_INPUT_PORT (1, port); | |
746 | scm_close_port (port); | |
747 | return SCM_UNSPECIFIED; | |
748 | } | |
749 | #undef FUNC_NAME | |
750 | ||
751 | SCM_DEFINE (scm_close_output_port, "close-output-port", 1, 0, 0, | |
752 | (SCM port), | |
753 | "Close the specified output port object. The routine has no effect if\n" | |
754 | "the file has already been closed. An exception may be raised if an\n" | |
755 | "error occurs. The value returned is unspecified.\n\n" | |
756 | "See also @ref{Ports and File Descriptors, close}, for a procedure\n" | |
757 | "which can close file descriptors.") | |
758 | #define FUNC_NAME s_scm_close_output_port | |
759 | { | |
760 | port = SCM_COERCE_OUTPORT (port); | |
761 | SCM_VALIDATE_OUTPUT_PORT (1, port); | |
762 | scm_close_port (port); | |
763 | return SCM_UNSPECIFIED; | |
0f2d19dd | 764 | } |
1bbd0b84 | 765 | #undef FUNC_NAME |
0f2d19dd | 766 | |
5dbc6c06 HWN |
767 | static SCM |
768 | scm_i_collect_keys_in_vector (void *closure, SCM key, SCM value, SCM result) | |
769 | { | |
770 | int *i = (int*) closure; | |
771 | scm_c_vector_set_x (result, *i, key); | |
772 | (*i)++; | |
773 | ||
774 | return result; | |
775 | } | |
776 | ||
c536b4b3 MV |
777 | void |
778 | scm_c_port_for_each (void (*proc)(void *data, SCM p), void *data) | |
c2ca4493 | 779 | { |
5dbc6c06 | 780 | int i = 0; |
3a5fb14d | 781 | size_t n; |
fdfe6305 MV |
782 | SCM ports; |
783 | ||
fdfe6305 MV |
784 | /* Even without pre-emptive multithreading, running arbitrary code |
785 | while scanning the port table is unsafe because the port table | |
3a5fb14d MV |
786 | can change arbitrarily (from a GC, for example). So we first |
787 | collect the ports into a vector. -mvo */ | |
fdfe6305 | 788 | |
9de87eea | 789 | scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex); |
5dbc6c06 | 790 | n = SCM_HASHTABLE_N_ITEMS (scm_i_port_weak_hash); |
9de87eea | 791 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
4057a3e0 | 792 | ports = scm_c_make_vector (n, SCM_BOOL_F); |
3a5fb14d | 793 | |
5dbc6c06 HWN |
794 | scm_i_pthread_mutex_lock (&scm_i_port_table_mutex); |
795 | ports = scm_internal_hash_fold (scm_i_collect_keys_in_vector, &i, | |
796 | ports, scm_i_port_weak_hash); | |
9de87eea | 797 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
3a5fb14d | 798 | |
5dbc6c06 HWN |
799 | for (i = 0; i < n; i++) { |
800 | SCM p = SCM_SIMPLE_VECTOR_REF (ports, i); | |
801 | if (SCM_PORTP (p)) | |
802 | proc (data, p); | |
803 | } | |
bd83658e RB |
804 | |
805 | scm_remember_upto_here_1 (ports); | |
c536b4b3 | 806 | } |
fdfe6305 | 807 | |
c536b4b3 MV |
808 | SCM_DEFINE (scm_port_for_each, "port-for-each", 1, 0, 0, |
809 | (SCM proc), | |
810 | "Apply @var{proc} to each port in the Guile port table\n" | |
811 | "in turn. The return value is unspecified. More specifically,\n" | |
812 | "@var{proc} is applied exactly once to every port that exists\n" | |
813 | "in the system at the time @var{port-for-each} is invoked.\n" | |
814 | "Changes to the port table while @var{port-for-each} is running\n" | |
815 | "have no effect as far as @var{port-for-each} is concerned.") | |
816 | #define FUNC_NAME s_scm_port_for_each | |
817 | { | |
818 | SCM_VALIDATE_PROC (1, proc); | |
819 | ||
820 | scm_c_port_for_each ((void (*)(void*,SCM))scm_call_1, proc); | |
c2ca4493 GH |
821 | return SCM_UNSPECIFIED; |
822 | } | |
823 | #undef FUNC_NAME | |
824 | ||
c536b4b3 | 825 | |
d68fee48 JB |
826 | \f |
827 | /* Utter miscellany. Gosh, we should clean this up some time. */ | |
828 | ||
3b3b36dd | 829 | SCM_DEFINE (scm_input_port_p, "input-port?", 1, 0, 0, |
1bbd0b84 | 830 | (SCM x), |
1e6808ea MG |
831 | "Return @code{#t} if @var{x} is an input port, otherwise return\n" |
832 | "@code{#f}. Any object satisfying this predicate also satisfies\n" | |
833 | "@code{port?}.") | |
1bbd0b84 | 834 | #define FUNC_NAME s_scm_input_port_p |
0f2d19dd | 835 | { |
7888309b | 836 | return scm_from_bool (SCM_INPUT_PORT_P (x)); |
0f2d19dd | 837 | } |
1bbd0b84 | 838 | #undef FUNC_NAME |
0f2d19dd | 839 | |
3b3b36dd | 840 | SCM_DEFINE (scm_output_port_p, "output-port?", 1, 0, 0, |
1bbd0b84 | 841 | (SCM x), |
1e6808ea MG |
842 | "Return @code{#t} if @var{x} is an output port, otherwise return\n" |
843 | "@code{#f}. Any object satisfying this predicate also satisfies\n" | |
844 | "@code{port?}.") | |
1bbd0b84 | 845 | #define FUNC_NAME s_scm_output_port_p |
0f2d19dd | 846 | { |
82893676 | 847 | x = SCM_COERCE_OUTPORT (x); |
7888309b | 848 | return scm_from_bool (SCM_OUTPUT_PORT_P (x)); |
0f2d19dd | 849 | } |
1bbd0b84 | 850 | #undef FUNC_NAME |
0f2d19dd | 851 | |
eb5c0a2a GH |
852 | SCM_DEFINE (scm_port_p, "port?", 1, 0, 0, |
853 | (SCM x), | |
1e6808ea | 854 | "Return a boolean indicating whether @var{x} is a port.\n" |
5352393c MG |
855 | "Equivalent to @code{(or (input-port? @var{x}) (output-port?\n" |
856 | "@var{x}))}.") | |
eb5c0a2a GH |
857 | #define FUNC_NAME s_scm_port_p |
858 | { | |
7888309b | 859 | return scm_from_bool (SCM_PORTP (x)); |
eb5c0a2a GH |
860 | } |
861 | #undef FUNC_NAME | |
862 | ||
3b3b36dd | 863 | SCM_DEFINE (scm_port_closed_p, "port-closed?", 1, 0, 0, |
1bbd0b84 | 864 | (SCM port), |
1e6808ea MG |
865 | "Return @code{#t} if @var{port} is closed or @code{#f} if it is\n" |
866 | "open.") | |
1bbd0b84 | 867 | #define FUNC_NAME s_scm_port_closed_p |
60d0643d | 868 | { |
34d19ef6 | 869 | SCM_VALIDATE_PORT (1, port); |
7888309b | 870 | return scm_from_bool (!SCM_OPPORTP (port)); |
60d0643d | 871 | } |
1bbd0b84 | 872 | #undef FUNC_NAME |
0f2d19dd | 873 | |
3b3b36dd | 874 | SCM_DEFINE (scm_eof_object_p, "eof-object?", 1, 0, 0, |
1bbd0b84 | 875 | (SCM x), |
1e6808ea MG |
876 | "Return @code{#t} if @var{x} is an end-of-file object; otherwise\n" |
877 | "return @code{#f}.") | |
1bbd0b84 | 878 | #define FUNC_NAME s_scm_eof_object_p |
0f2d19dd | 879 | { |
7888309b | 880 | return scm_from_bool(SCM_EOF_OBJECT_P (x)); |
0f2d19dd | 881 | } |
1bbd0b84 | 882 | #undef FUNC_NAME |
0f2d19dd | 883 | |
3b3b36dd | 884 | SCM_DEFINE (scm_force_output, "force-output", 0, 1, 0, |
1bbd0b84 | 885 | (SCM port), |
b380b885 | 886 | "Flush the specified output port, or the current output port if @var{port}\n" |
9401323e | 887 | "is omitted. The current output buffer contents are passed to the\n" |
b380b885 MD |
888 | "underlying port implementation (e.g., in the case of fports, the\n" |
889 | "data will be written to the file and the output buffer will be cleared.)\n" | |
890 | "It has no effect on an unbuffered port.\n\n" | |
891 | "The return value is unspecified.") | |
1bbd0b84 | 892 | #define FUNC_NAME s_scm_force_output |
0f2d19dd JB |
893 | { |
894 | if (SCM_UNBNDP (port)) | |
9de87eea | 895 | port = scm_current_output_port (); |
0f2d19dd | 896 | else |
78446828 MV |
897 | { |
898 | port = SCM_COERCE_OUTPORT (port); | |
34d19ef6 | 899 | SCM_VALIDATE_OPOUTPORT (1, port); |
78446828 | 900 | } |
affc96b5 | 901 | scm_flush (port); |
ee149d03 | 902 | return SCM_UNSPECIFIED; |
0f2d19dd | 903 | } |
1bbd0b84 | 904 | #undef FUNC_NAME |
0f2d19dd | 905 | |
5dbc6c06 HWN |
906 | |
907 | static void | |
61d3568b | 908 | flush_output_port (void *closure, SCM port) |
5dbc6c06 | 909 | { |
5dbc6c06 HWN |
910 | if (SCM_OPOUTPORTP (port)) |
911 | scm_flush (port); | |
912 | } | |
913 | ||
a1ec6916 | 914 | SCM_DEFINE (scm_flush_all_ports, "flush-all-ports", 0, 0, 0, |
1bbd0b84 | 915 | (), |
b380b885 MD |
916 | "Equivalent to calling @code{force-output} on\n" |
917 | "all open output ports. The return value is unspecified.") | |
1bbd0b84 | 918 | #define FUNC_NAME s_scm_flush_all_ports |
89ea5b7c | 919 | { |
5dbc6c06 | 920 | scm_c_port_for_each (&flush_output_port, NULL); |
89ea5b7c GH |
921 | return SCM_UNSPECIFIED; |
922 | } | |
1bbd0b84 | 923 | #undef FUNC_NAME |
0f2d19dd | 924 | |
3b3b36dd | 925 | SCM_DEFINE (scm_read_char, "read-char", 0, 1, 0, |
1bbd0b84 | 926 | (SCM port), |
1e6808ea MG |
927 | "Return the next character available from @var{port}, updating\n" |
928 | "@var{port} to point to the following character. If no more\n" | |
929 | "characters are available, the end-of-file object is returned.") | |
1bbd0b84 | 930 | #define FUNC_NAME s_scm_read_char |
0f2d19dd JB |
931 | { |
932 | int c; | |
933 | if (SCM_UNBNDP (port)) | |
9de87eea | 934 | port = scm_current_input_port (); |
34d19ef6 | 935 | SCM_VALIDATE_OPINPORT (1, port); |
b7f3516f | 936 | c = scm_getc (port); |
0f2d19dd JB |
937 | if (EOF == c) |
938 | return SCM_EOF_VAL; | |
7866a09b | 939 | return SCM_MAKE_CHAR (c); |
0f2d19dd | 940 | } |
1bbd0b84 | 941 | #undef FUNC_NAME |
0f2d19dd | 942 | |
5c070ca7 | 943 | /* this should only be called when the read buffer is empty. it |
affc96b5 | 944 | tries to refill the read buffer. it returns the first char from |
5c070ca7 | 945 | the port, which is either EOF or *(pt->read_pos). */ |
6c951427 | 946 | int |
affc96b5 | 947 | scm_fill_input (SCM port) |
6c951427 | 948 | { |
92c2555f | 949 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
283a1a0e | 950 | |
b5cb4464 NJ |
951 | assert (pt->read_pos == pt->read_end); |
952 | ||
6c951427 GH |
953 | if (pt->read_buf == pt->putback_buf) |
954 | { | |
955 | /* finished reading put-back chars. */ | |
956 | pt->read_buf = pt->saved_read_buf; | |
957 | pt->read_pos = pt->saved_read_pos; | |
958 | pt->read_end = pt->saved_read_end; | |
959 | pt->read_buf_size = pt->saved_read_buf_size; | |
960 | if (pt->read_pos < pt->read_end) | |
5c070ca7 | 961 | return *(pt->read_pos); |
6c951427 | 962 | } |
affc96b5 | 963 | return scm_ptobs[SCM_PTOBNUM (port)].fill_input (port); |
6c951427 GH |
964 | } |
965 | ||
3cb988bd | 966 | |
6fe692e9 MD |
967 | /* scm_lfwrite |
968 | * | |
53802ea8 MV |
969 | * This function differs from scm_c_write; it updates port line and |
970 | * column. */ | |
6fe692e9 | 971 | |
9c44cd45 MG |
972 | static void |
973 | update_port_lf (scm_t_wchar c, SCM port) | |
974 | { | |
975 | if (c == '\a') | |
976 | { | |
977 | } | |
978 | else if (c == '\b') | |
979 | { | |
980 | SCM_DECCOL (port); | |
981 | } | |
982 | else if (c == '\n') | |
983 | { | |
984 | SCM_INCLINE (port); | |
985 | } | |
986 | else if (c == '\r') | |
987 | { | |
988 | SCM_ZEROCOL (port); | |
989 | } | |
990 | else if (c == '\t') | |
991 | { | |
992 | SCM_TABCOL (port); | |
993 | } | |
994 | else | |
995 | { | |
996 | SCM_INCCOL (port); | |
997 | } | |
998 | } | |
999 | ||
1000 | void | |
1be6b49c | 1001 | scm_lfwrite (const char *ptr, size_t size, SCM port) |
ee149d03 | 1002 | { |
92c2555f MV |
1003 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
1004 | scm_t_ptob_descriptor *ptob = &scm_ptobs[SCM_PTOBNUM (port)]; | |
3e2043c4 | 1005 | |
840ae05d | 1006 | if (pt->rw_active == SCM_PORT_READ) |
affc96b5 | 1007 | scm_end_input (port); |
283a1a0e | 1008 | |
31703ab8 | 1009 | ptob->write (port, ptr, size); |
840ae05d | 1010 | |
9c44cd45 MG |
1011 | for (; size; ptr++, size--) |
1012 | update_port_lf ((scm_t_wchar) (unsigned char) *ptr, port); | |
1013 | ||
1014 | if (pt->rw_random) | |
1015 | pt->rw_active = SCM_PORT_WRITE; | |
1016 | } | |
1017 | ||
1018 | /* Write a scheme string STR to PORT from START inclusive to END | |
1019 | exclusive. */ | |
1020 | void | |
1021 | scm_lfwrite_substr (SCM str, size_t start, size_t end, SCM port) | |
1022 | { | |
1023 | size_t i, size = scm_i_string_length (str); | |
1024 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
1025 | scm_t_ptob_descriptor *ptob = &scm_ptobs[SCM_PTOBNUM (port)]; | |
1026 | scm_t_wchar p; | |
1027 | char *buf; | |
1028 | size_t len; | |
1029 | ||
1030 | if (pt->rw_active == SCM_PORT_READ) | |
1031 | scm_end_input (port); | |
1032 | ||
1033 | if (end == -1) | |
1034 | end = size; | |
1035 | size = end - start; | |
1036 | ||
1037 | buf = scm_to_stringn (scm_c_substring (str, start, end), &len, | |
1038 | NULL, iconveh_escape_sequence); | |
1039 | ptob->write (port, buf, len); | |
1040 | free (buf); | |
1041 | ||
1042 | for (i = 0; i < size; i++) | |
1043 | { | |
1044 | p = scm_i_string_ref (str, i + start); | |
1045 | update_port_lf (p, port); | |
53802ea8 | 1046 | } |
53802ea8 | 1047 | |
840ae05d JB |
1048 | if (pt->rw_random) |
1049 | pt->rw_active = SCM_PORT_WRITE; | |
ee149d03 | 1050 | } |
3cb988bd | 1051 | |
9c44cd45 MG |
1052 | /* Write a scheme string STR to PORT. */ |
1053 | void | |
1054 | scm_lfwrite_str (SCM str, SCM port) | |
1055 | { | |
1056 | scm_lfwrite_substr (str, 0, -1, port); | |
1057 | } | |
1058 | ||
6fe692e9 MD |
1059 | /* scm_c_read |
1060 | * | |
1061 | * Used by an application to read arbitrary number of bytes from an | |
1062 | * SCM port. Same semantics as libc read, except that scm_c_read only | |
1063 | * returns less than SIZE bytes if at end-of-file. | |
1064 | * | |
1065 | * Warning: Doesn't update port line and column counts! */ | |
1066 | ||
b5cb4464 NJ |
1067 | /* This structure, and the following swap_buffer function, are used |
1068 | for temporarily swapping a port's own read buffer, and the buffer | |
1069 | that the caller of scm_c_read provides. */ | |
1070 | struct port_and_swap_buffer | |
1071 | { | |
1072 | scm_t_port *pt; | |
1073 | unsigned char *buffer; | |
1074 | size_t size; | |
1075 | }; | |
1076 | ||
1077 | static void | |
1078 | swap_buffer (void *data) | |
1079 | { | |
1080 | struct port_and_swap_buffer *psb = (struct port_and_swap_buffer *) data; | |
1081 | unsigned char *old_buf = psb->pt->read_buf; | |
1082 | size_t old_size = psb->pt->read_buf_size; | |
1083 | ||
1084 | /* Make the port use (buffer, size) from the struct. */ | |
1085 | psb->pt->read_pos = psb->pt->read_buf = psb->pt->read_end = psb->buffer; | |
1086 | psb->pt->read_buf_size = psb->size; | |
1087 | ||
1088 | /* Save the port's old (buffer, size) in the struct. */ | |
1089 | psb->buffer = old_buf; | |
1090 | psb->size = old_size; | |
1091 | } | |
1092 | ||
1be6b49c ML |
1093 | size_t |
1094 | scm_c_read (SCM port, void *buffer, size_t size) | |
693758d5 | 1095 | #define FUNC_NAME "scm_c_read" |
6fe692e9 | 1096 | { |
693758d5 | 1097 | scm_t_port *pt; |
1be6b49c | 1098 | size_t n_read = 0, n_available; |
b5cb4464 | 1099 | struct port_and_swap_buffer psb; |
6fe692e9 | 1100 | |
693758d5 LC |
1101 | SCM_VALIDATE_OPINPORT (1, port); |
1102 | ||
1103 | pt = SCM_PTAB_ENTRY (port); | |
6fe692e9 MD |
1104 | if (pt->rw_active == SCM_PORT_WRITE) |
1105 | scm_ptobs[SCM_PTOBNUM (port)].flush (port); | |
1106 | ||
1107 | if (pt->rw_random) | |
1108 | pt->rw_active = SCM_PORT_READ; | |
1109 | ||
b5cb4464 NJ |
1110 | /* Take bytes first from the port's read buffer. */ |
1111 | if (pt->read_pos < pt->read_end) | |
6fe692e9 | 1112 | { |
b5cb4464 | 1113 | n_available = min (size, pt->read_end - pt->read_pos); |
6fe692e9 | 1114 | memcpy (buffer, pt->read_pos, n_available); |
910d1e40 | 1115 | buffer = (char *) buffer + n_available; |
6fe692e9 MD |
1116 | pt->read_pos += n_available; |
1117 | n_read += n_available; | |
6fe692e9 | 1118 | size -= n_available; |
6fe692e9 MD |
1119 | } |
1120 | ||
b5cb4464 NJ |
1121 | /* Avoid the scm_dynwind_* costs if we now have enough data. */ |
1122 | if (size == 0) | |
1123 | return n_read; | |
1124 | ||
1125 | /* Now we will call scm_fill_input repeatedly until we have read the | |
1126 | requested number of bytes. (Note that a single scm_fill_input | |
1127 | call does not guarantee to fill the whole of the port's read | |
6d227556 NJ |
1128 | buffer.) */ |
1129 | if (pt->read_buf_size <= 1) | |
b5cb4464 | 1130 | { |
6d227556 NJ |
1131 | /* The port that we are reading from is unbuffered - i.e. does |
1132 | not have its own persistent buffer - but we have a buffer, | |
1133 | provided by our caller, that is the right size for the data | |
1134 | that is wanted. For the following scm_fill_input calls, | |
1135 | therefore, we use the buffer in hand as the port's read | |
1136 | buffer. | |
1137 | ||
1138 | We need to make sure that the port's normal (1 byte) buffer | |
1139 | is reinstated in case one of the scm_fill_input () calls | |
1140 | throws an exception; we use the scm_dynwind_* API to achieve | |
1141 | that. */ | |
1142 | psb.pt = pt; | |
1143 | psb.buffer = buffer; | |
1144 | psb.size = size; | |
1145 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); | |
1146 | scm_dynwind_rewind_handler (swap_buffer, &psb, SCM_F_WIND_EXPLICITLY); | |
1147 | scm_dynwind_unwind_handler (swap_buffer, &psb, SCM_F_WIND_EXPLICITLY); | |
1148 | ||
1149 | /* Call scm_fill_input until we have all the bytes that we need, | |
1150 | or we hit EOF. */ | |
1151 | while (pt->read_buf_size && (scm_fill_input (port) != EOF)) | |
1152 | { | |
1153 | pt->read_buf_size -= (pt->read_end - pt->read_pos); | |
1154 | pt->read_pos = pt->read_buf = pt->read_end; | |
1155 | } | |
1156 | n_read += pt->read_buf - (unsigned char *) buffer; | |
b5cb4464 | 1157 | |
6d227556 NJ |
1158 | /* Reinstate the port's normal buffer. */ |
1159 | scm_dynwind_end (); | |
1160 | } | |
1161 | else | |
1162 | { | |
1163 | /* The port has its own buffer. It is important that we use it, | |
1164 | even if it happens to be smaller than our caller's buffer, so | |
1165 | that a custom port implementation's entry points (in | |
1166 | particular, fill_input) can rely on the buffer always being | |
1167 | the same as they first set up. */ | |
1168 | while (size && (scm_fill_input (port) != EOF)) | |
1169 | { | |
1170 | n_available = min (size, pt->read_end - pt->read_pos); | |
1171 | memcpy (buffer, pt->read_pos, n_available); | |
1172 | buffer = (char *) buffer + n_available; | |
1173 | pt->read_pos += n_available; | |
1174 | n_read += n_available; | |
1175 | size -= n_available; | |
1176 | } | |
1177 | } | |
6fe692e9 | 1178 | |
b5cb4464 | 1179 | return n_read; |
6fe692e9 | 1180 | } |
693758d5 | 1181 | #undef FUNC_NAME |
6fe692e9 MD |
1182 | |
1183 | /* scm_c_write | |
1184 | * | |
1185 | * Used by an application to write arbitrary number of bytes to an SCM | |
1186 | * port. Similar semantics as libc write. However, unlike libc | |
1187 | * write, scm_c_write writes the requested number of bytes and has no | |
1188 | * return value. | |
1189 | * | |
1190 | * Warning: Doesn't update port line and column counts! | |
1191 | */ | |
1192 | ||
693758d5 | 1193 | void |
1be6b49c | 1194 | scm_c_write (SCM port, const void *ptr, size_t size) |
693758d5 | 1195 | #define FUNC_NAME "scm_c_write" |
6fe692e9 | 1196 | { |
693758d5 LC |
1197 | scm_t_port *pt; |
1198 | scm_t_ptob_descriptor *ptob; | |
1199 | ||
1200 | SCM_VALIDATE_OPOUTPORT (1, port); | |
1201 | ||
1202 | pt = SCM_PTAB_ENTRY (port); | |
1203 | ptob = &scm_ptobs[SCM_PTOBNUM (port)]; | |
6fe692e9 MD |
1204 | |
1205 | if (pt->rw_active == SCM_PORT_READ) | |
1206 | scm_end_input (port); | |
1207 | ||
1208 | ptob->write (port, ptr, size); | |
1209 | ||
1210 | if (pt->rw_random) | |
1211 | pt->rw_active = SCM_PORT_WRITE; | |
1212 | } | |
693758d5 | 1213 | #undef FUNC_NAME |
3cb988bd | 1214 | |
ee149d03 | 1215 | void |
a284e297 | 1216 | scm_flush (SCM port) |
ee149d03 | 1217 | { |
c014a02e | 1218 | long i = SCM_PTOBNUM (port); |
affc96b5 | 1219 | (scm_ptobs[i].flush) (port); |
ee149d03 JB |
1220 | } |
1221 | ||
283a1a0e | 1222 | void |
a284e297 | 1223 | scm_end_input (SCM port) |
283a1a0e | 1224 | { |
c014a02e | 1225 | long offset; |
92c2555f | 1226 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
283a1a0e GH |
1227 | |
1228 | if (pt->read_buf == pt->putback_buf) | |
1229 | { | |
1230 | offset = pt->read_end - pt->read_pos; | |
1231 | pt->read_buf = pt->saved_read_buf; | |
1232 | pt->read_pos = pt->saved_read_pos; | |
1233 | pt->read_end = pt->saved_read_end; | |
1234 | pt->read_buf_size = pt->saved_read_buf_size; | |
1235 | } | |
1236 | else | |
1237 | offset = 0; | |
1238 | ||
affc96b5 | 1239 | scm_ptobs[SCM_PTOBNUM (port)].end_input (port, offset); |
283a1a0e GH |
1240 | } |
1241 | ||
ee149d03 JB |
1242 | \f |
1243 | ||
1244 | ||
1245 | void | |
a284e297 | 1246 | scm_ungetc (int c, SCM port) |
c6c79933 | 1247 | #define FUNC_NAME "scm_ungetc" |
ee149d03 | 1248 | { |
92c2555f | 1249 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
840ae05d | 1250 | |
6c951427 GH |
1251 | if (pt->read_buf == pt->putback_buf) |
1252 | /* already using the put-back buffer. */ | |
1253 | { | |
1254 | /* enlarge putback_buf if necessary. */ | |
1255 | if (pt->read_end == pt->read_buf + pt->read_buf_size | |
1256 | && pt->read_buf == pt->read_pos) | |
1257 | { | |
1be6b49c | 1258 | size_t new_size = pt->read_buf_size * 2; |
c6c79933 | 1259 | unsigned char *tmp = (unsigned char *) |
4c9419ac MV |
1260 | scm_gc_realloc (pt->putback_buf, pt->read_buf_size, new_size, |
1261 | "putback buffer"); | |
6c951427 | 1262 | |
6c951427 GH |
1263 | pt->read_pos = pt->read_buf = pt->putback_buf = tmp; |
1264 | pt->read_end = pt->read_buf + pt->read_buf_size; | |
1265 | pt->read_buf_size = pt->putback_buf_size = new_size; | |
1266 | } | |
1267 | ||
1268 | /* shift any existing bytes to buffer + 1. */ | |
1269 | if (pt->read_pos == pt->read_end) | |
1270 | pt->read_end = pt->read_buf + 1; | |
1271 | else if (pt->read_pos != pt->read_buf + 1) | |
1272 | { | |
1273 | int count = pt->read_end - pt->read_pos; | |
1274 | ||
1275 | memmove (pt->read_buf + 1, pt->read_pos, count); | |
1276 | pt->read_end = pt->read_buf + 1 + count; | |
1277 | } | |
1278 | ||
1279 | pt->read_pos = pt->read_buf; | |
1280 | } | |
1281 | else | |
1282 | /* switch to the put-back buffer. */ | |
1283 | { | |
1284 | if (pt->putback_buf == NULL) | |
1285 | { | |
c357d546 | 1286 | pt->putback_buf |
4c9419ac MV |
1287 | = (unsigned char *) scm_gc_malloc (SCM_INITIAL_PUTBACK_BUF_SIZE, |
1288 | "putback buffer"); | |
6c951427 GH |
1289 | pt->putback_buf_size = SCM_INITIAL_PUTBACK_BUF_SIZE; |
1290 | } | |
1291 | ||
1292 | pt->saved_read_buf = pt->read_buf; | |
1293 | pt->saved_read_pos = pt->read_pos; | |
1294 | pt->saved_read_end = pt->read_end; | |
1295 | pt->saved_read_buf_size = pt->read_buf_size; | |
1296 | ||
1297 | pt->read_pos = pt->read_buf = pt->putback_buf; | |
1298 | pt->read_end = pt->read_buf + 1; | |
1299 | pt->read_buf_size = pt->putback_buf_size; | |
1300 | } | |
1301 | ||
1302 | *pt->read_buf = c; | |
ee149d03 | 1303 | |
840ae05d JB |
1304 | if (pt->rw_random) |
1305 | pt->rw_active = SCM_PORT_READ; | |
1306 | ||
ee149d03 JB |
1307 | if (c == '\n') |
1308 | { | |
1309 | /* What should col be in this case? | |
1310 | * We'll leave it at -1. | |
1311 | */ | |
1312 | SCM_LINUM (port) -= 1; | |
1313 | } | |
1314 | else | |
1315 | SCM_COL(port) -= 1; | |
1316 | } | |
c6c79933 | 1317 | #undef FUNC_NAME |
ee149d03 JB |
1318 | |
1319 | ||
1320 | void | |
70d63753 | 1321 | scm_ungets (const char *s, int n, SCM port) |
ee149d03 JB |
1322 | { |
1323 | /* This is simple minded and inefficient, but unreading strings is | |
1324 | * probably not a common operation, and remember that line and | |
1325 | * column numbers have to be handled... | |
1326 | * | |
1327 | * Please feel free to write an optimized version! | |
1328 | */ | |
1329 | while (n--) | |
1330 | scm_ungetc (s[n], port); | |
1331 | } | |
1332 | ||
1333 | ||
3b3b36dd | 1334 | SCM_DEFINE (scm_peek_char, "peek-char", 0, 1, 0, |
1bbd0b84 | 1335 | (SCM port), |
1e6808ea MG |
1336 | "Return the next character available from @var{port},\n" |
1337 | "@emph{without} updating @var{port} to point to the following\n" | |
1338 | "character. If no more characters are available, the\n" | |
c2dfff19 KR |
1339 | "end-of-file object is returned.\n" |
1340 | "\n" | |
1341 | "The value returned by\n" | |
1e6808ea MG |
1342 | "a call to @code{peek-char} is the same as the value that would\n" |
1343 | "have been returned by a call to @code{read-char} on the same\n" | |
1344 | "port. The only difference is that the very next call to\n" | |
1345 | "@code{read-char} or @code{peek-char} on that @var{port} will\n" | |
1346 | "return the value returned by the preceding call to\n" | |
1347 | "@code{peek-char}. In particular, a call to @code{peek-char} on\n" | |
1348 | "an interactive port will hang waiting for input whenever a call\n" | |
c2dfff19 | 1349 | "to @code{read-char} would have hung.") |
1bbd0b84 | 1350 | #define FUNC_NAME s_scm_peek_char |
ee149d03 | 1351 | { |
1a973c42 | 1352 | int c, column; |
ee149d03 | 1353 | if (SCM_UNBNDP (port)) |
9de87eea | 1354 | port = scm_current_input_port (); |
ee149d03 | 1355 | else |
34d19ef6 | 1356 | SCM_VALIDATE_OPINPORT (1, port); |
1a973c42 | 1357 | column = SCM_COL(port); |
ee149d03 JB |
1358 | c = scm_getc (port); |
1359 | if (EOF == c) | |
1360 | return SCM_EOF_VAL; | |
1361 | scm_ungetc (c, port); | |
1a973c42 | 1362 | SCM_COL(port) = column; |
7866a09b | 1363 | return SCM_MAKE_CHAR (c); |
3cb988bd | 1364 | } |
1bbd0b84 | 1365 | #undef FUNC_NAME |
3cb988bd | 1366 | |
1be4270a | 1367 | SCM_DEFINE (scm_unread_char, "unread-char", 1, 1, 0, |
1bbd0b84 | 1368 | (SCM cobj, SCM port), |
b380b885 MD |
1369 | "Place @var{char} in @var{port} so that it will be read by the\n" |
1370 | "next read operation. If called multiple times, the unread characters\n" | |
1371 | "will be read again in last-in first-out order. If @var{port} is\n" | |
1372 | "not supplied, the current input port is used.") | |
1bbd0b84 | 1373 | #define FUNC_NAME s_scm_unread_char |
0f2d19dd JB |
1374 | { |
1375 | int c; | |
1376 | ||
34d19ef6 | 1377 | SCM_VALIDATE_CHAR (1, cobj); |
0f2d19dd | 1378 | if (SCM_UNBNDP (port)) |
9de87eea | 1379 | port = scm_current_input_port (); |
0f2d19dd | 1380 | else |
34d19ef6 | 1381 | SCM_VALIDATE_OPINPORT (2, port); |
0f2d19dd | 1382 | |
7866a09b | 1383 | c = SCM_CHAR (cobj); |
0f2d19dd | 1384 | |
b7f3516f | 1385 | scm_ungetc (c, port); |
0f2d19dd JB |
1386 | return cobj; |
1387 | } | |
1bbd0b84 | 1388 | #undef FUNC_NAME |
0f2d19dd | 1389 | |
a1ec6916 | 1390 | SCM_DEFINE (scm_unread_string, "unread-string", 2, 0, 0, |
1bbd0b84 | 1391 | (SCM str, SCM port), |
b380b885 MD |
1392 | "Place the string @var{str} in @var{port} so that its characters will be\n" |
1393 | "read in subsequent read operations. If called multiple times, the\n" | |
1394 | "unread characters will be read again in last-in first-out order. If\n" | |
1395 | "@var{port} is not supplied, the current-input-port is used.") | |
1bbd0b84 | 1396 | #define FUNC_NAME s_scm_unread_string |
ee1e7e13 | 1397 | { |
34d19ef6 | 1398 | SCM_VALIDATE_STRING (1, str); |
ee1e7e13 | 1399 | if (SCM_UNBNDP (port)) |
9de87eea | 1400 | port = scm_current_input_port (); |
ee1e7e13 | 1401 | else |
34d19ef6 | 1402 | SCM_VALIDATE_OPINPORT (2, port); |
ee1e7e13 | 1403 | |
3a5fb14d | 1404 | scm_ungets (scm_i_string_chars (str), scm_i_string_length (str), port); |
ee1e7e13 MD |
1405 | |
1406 | return str; | |
1407 | } | |
1bbd0b84 | 1408 | #undef FUNC_NAME |
ee1e7e13 | 1409 | |
a1ec6916 | 1410 | SCM_DEFINE (scm_seek, "seek", 3, 0, 0, |
1e6808ea MG |
1411 | (SCM fd_port, SCM offset, SCM whence), |
1412 | "Sets the current position of @var{fd/port} to the integer\n" | |
1413 | "@var{offset}, which is interpreted according to the value of\n" | |
1414 | "@var{whence}.\n" | |
1415 | "\n" | |
1416 | "One of the following variables should be supplied for\n" | |
1417 | "@var{whence}:\n" | |
b380b885 MD |
1418 | "@defvar SEEK_SET\n" |
1419 | "Seek from the beginning of the file.\n" | |
1420 | "@end defvar\n" | |
1421 | "@defvar SEEK_CUR\n" | |
1422 | "Seek from the current position.\n" | |
1423 | "@end defvar\n" | |
1424 | "@defvar SEEK_END\n" | |
1425 | "Seek from the end of the file.\n" | |
1e6808ea MG |
1426 | "@end defvar\n" |
1427 | "If @var{fd/port} is a file descriptor, the underlying system\n" | |
1428 | "call is @code{lseek}. @var{port} may be a string port.\n" | |
1429 | "\n" | |
1430 | "The value returned is the new position in the file. This means\n" | |
1431 | "that the current position of a port can be obtained using:\n" | |
1432 | "@lisp\n" | |
b380b885 | 1433 | "(seek port 0 SEEK_CUR)\n" |
1e6808ea | 1434 | "@end lisp") |
1bbd0b84 | 1435 | #define FUNC_NAME s_scm_seek |
840ae05d | 1436 | { |
840ae05d JB |
1437 | int how; |
1438 | ||
1e6808ea | 1439 | fd_port = SCM_COERCE_OUTPORT (fd_port); |
840ae05d | 1440 | |
a55c2b68 | 1441 | how = scm_to_int (whence); |
840ae05d | 1442 | if (how != SEEK_SET && how != SEEK_CUR && how != SEEK_END) |
1bbd0b84 | 1443 | SCM_OUT_OF_RANGE (3, whence); |
23f2b9a3 | 1444 | |
0a94eb00 | 1445 | if (SCM_OPPORTP (fd_port)) |
840ae05d | 1446 | { |
92c2555f | 1447 | scm_t_ptob_descriptor *ptob = scm_ptobs + SCM_PTOBNUM (fd_port); |
f1ce9199 LC |
1448 | off_t_or_off64_t off = scm_to_off_t_or_off64_t (offset); |
1449 | off_t_or_off64_t rv; | |
840ae05d JB |
1450 | |
1451 | if (!ptob->seek) | |
1bbd0b84 | 1452 | SCM_MISC_ERROR ("port is not seekable", |
1e6808ea | 1453 | scm_cons (fd_port, SCM_EOL)); |
840ae05d | 1454 | else |
1e6808ea | 1455 | rv = ptob->seek (fd_port, off, how); |
f1ce9199 | 1456 | return scm_from_off_t_or_off64_t (rv); |
840ae05d JB |
1457 | } |
1458 | else /* file descriptor?. */ | |
1459 | { | |
23f2b9a3 KR |
1460 | off_t_or_off64_t off = scm_to_off_t_or_off64_t (offset); |
1461 | off_t_or_off64_t rv; | |
1462 | rv = lseek_or_lseek64 (scm_to_int (fd_port), off, how); | |
840ae05d | 1463 | if (rv == -1) |
1bbd0b84 | 1464 | SCM_SYSERROR; |
23f2b9a3 | 1465 | return scm_from_off_t_or_off64_t (rv); |
840ae05d | 1466 | } |
840ae05d | 1467 | } |
1bbd0b84 | 1468 | #undef FUNC_NAME |
840ae05d | 1469 | |
8ab3d8a0 KR |
1470 | #ifndef O_BINARY |
1471 | #define O_BINARY 0 | |
1472 | #endif | |
1473 | ||
1474 | /* Mingw has ftruncate(), perhaps implemented above using chsize, but | |
1475 | doesn't have the filename version truncate(), hence this code. */ | |
1476 | #if HAVE_FTRUNCATE && ! HAVE_TRUNCATE | |
1477 | static int | |
1478 | truncate (const char *file, off_t length) | |
82893676 | 1479 | { |
8ab3d8a0 KR |
1480 | int ret, fdes; |
1481 | ||
1482 | fdes = open (file, O_BINARY | O_WRONLY); | |
1483 | if (fdes == -1) | |
1484 | return -1; | |
1485 | ||
1486 | ret = ftruncate (fdes, length); | |
1487 | if (ret == -1) | |
82893676 | 1488 | { |
8ab3d8a0 | 1489 | int save_errno = errno; |
82893676 | 1490 | close (fdes); |
8ab3d8a0 KR |
1491 | errno = save_errno; |
1492 | return -1; | |
82893676 | 1493 | } |
8ab3d8a0 KR |
1494 | |
1495 | return close (fdes); | |
82893676 | 1496 | } |
8ab3d8a0 | 1497 | #endif /* HAVE_FTRUNCATE && ! HAVE_TRUNCATE */ |
82893676 | 1498 | |
a1ec6916 | 1499 | SCM_DEFINE (scm_truncate_file, "truncate-file", 1, 1, 0, |
1bbd0b84 | 1500 | (SCM object, SCM length), |
8ab3d8a0 KR |
1501 | "Truncate @var{file} to @var{length} bytes. @var{file} can be a\n" |
1502 | "filename string, a port object, or an integer file descriptor.\n" | |
1503 | "The return value is unspecified.\n" | |
1504 | "\n" | |
1505 | "For a port or file descriptor @var{length} can be omitted, in\n" | |
1506 | "which case the file is truncated at the current position (per\n" | |
1507 | "@code{ftell} above).\n" | |
1508 | "\n" | |
1509 | "On most systems a file can be extended by giving a length\n" | |
1510 | "greater than the current size, but this is not mandatory in the\n" | |
1511 | "POSIX standard.") | |
1bbd0b84 | 1512 | #define FUNC_NAME s_scm_truncate_file |
840ae05d | 1513 | { |
69bc9ff3 | 1514 | int rv; |
69bc9ff3 | 1515 | |
2b829bbb KR |
1516 | /* "object" can be a port, fdes or filename. |
1517 | ||
1518 | Negative "length" makes no sense, but it's left to truncate() or | |
1519 | ftruncate() to give back an error for that (normally EINVAL). | |
1520 | */ | |
840ae05d | 1521 | |
840ae05d JB |
1522 | if (SCM_UNBNDP (length)) |
1523 | { | |
69bc9ff3 | 1524 | /* must supply length if object is a filename. */ |
7f9994d9 | 1525 | if (scm_is_string (object)) |
34d19ef6 | 1526 | SCM_MISC_ERROR("must supply length if OBJECT is a filename", SCM_EOL); |
69bc9ff3 | 1527 | |
e11e83f3 | 1528 | length = scm_seek (object, SCM_INUM0, scm_from_int (SEEK_CUR)); |
840ae05d | 1529 | } |
3fe6190f | 1530 | |
69bc9ff3 | 1531 | object = SCM_COERCE_OUTPORT (object); |
e11e83f3 | 1532 | if (scm_is_integer (object)) |
69bc9ff3 | 1533 | { |
23f2b9a3 KR |
1534 | off_t_or_off64_t c_length = scm_to_off_t_or_off64_t (length); |
1535 | SCM_SYSCALL (rv = ftruncate_or_ftruncate64 (scm_to_int (object), | |
1536 | c_length)); | |
69bc9ff3 | 1537 | } |
0c95b57d | 1538 | else if (SCM_OPOUTPORTP (object)) |
69bc9ff3 | 1539 | { |
f1ce9199 | 1540 | off_t_or_off64_t c_length = scm_to_off_t_or_off64_t (length); |
92c2555f MV |
1541 | scm_t_port *pt = SCM_PTAB_ENTRY (object); |
1542 | scm_t_ptob_descriptor *ptob = scm_ptobs + SCM_PTOBNUM (object); | |
69bc9ff3 | 1543 | |
affc96b5 | 1544 | if (!ptob->truncate) |
1bbd0b84 | 1545 | SCM_MISC_ERROR ("port is not truncatable", SCM_EOL); |
69bc9ff3 | 1546 | if (pt->rw_active == SCM_PORT_READ) |
affc96b5 | 1547 | scm_end_input (object); |
69bc9ff3 | 1548 | else if (pt->rw_active == SCM_PORT_WRITE) |
affc96b5 | 1549 | ptob->flush (object); |
69bc9ff3 | 1550 | |
affc96b5 | 1551 | ptob->truncate (object, c_length); |
69bc9ff3 GH |
1552 | rv = 0; |
1553 | } | |
1554 | else | |
1555 | { | |
2b829bbb | 1556 | off_t_or_off64_t c_length = scm_to_off_t_or_off64_t (length); |
7f9994d9 MV |
1557 | char *str = scm_to_locale_string (object); |
1558 | int eno; | |
2b829bbb | 1559 | SCM_SYSCALL (rv = truncate_or_truncate64 (str, c_length)); |
7f9994d9 MV |
1560 | eno = errno; |
1561 | free (str); | |
1562 | errno = eno; | |
69bc9ff3 GH |
1563 | } |
1564 | if (rv == -1) | |
1bbd0b84 | 1565 | SCM_SYSERROR; |
840ae05d JB |
1566 | return SCM_UNSPECIFIED; |
1567 | } | |
1bbd0b84 | 1568 | #undef FUNC_NAME |
840ae05d | 1569 | |
a1ec6916 | 1570 | SCM_DEFINE (scm_port_line, "port-line", 1, 0, 0, |
1bbd0b84 | 1571 | (SCM port), |
a150979d KR |
1572 | "Return the current line number for @var{port}.\n" |
1573 | "\n" | |
1574 | "The first line of a file is 0. But you might want to add 1\n" | |
1575 | "when printing line numbers, since starting from 1 is\n" | |
1576 | "traditional in error messages, and likely to be more natural to\n" | |
1577 | "non-programmers.") | |
1bbd0b84 | 1578 | #define FUNC_NAME s_scm_port_line |
0f2d19dd | 1579 | { |
78446828 | 1580 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 1581 | SCM_VALIDATE_OPENPORT (1, port); |
651f2cd2 | 1582 | return scm_from_long (SCM_LINUM (port)); |
0f2d19dd | 1583 | } |
1bbd0b84 | 1584 | #undef FUNC_NAME |
0f2d19dd | 1585 | |
a1ec6916 | 1586 | SCM_DEFINE (scm_set_port_line_x, "set-port-line!", 2, 0, 0, |
1bbd0b84 | 1587 | (SCM port, SCM line), |
a150979d KR |
1588 | "Set the current line number for @var{port} to @var{line}. The\n" |
1589 | "first line of a file is 0.") | |
1bbd0b84 | 1590 | #define FUNC_NAME s_scm_set_port_line_x |
d043d8c2 | 1591 | { |
360fc44c | 1592 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 1593 | SCM_VALIDATE_OPENPORT (1, port); |
651f2cd2 | 1594 | SCM_PTAB_ENTRY (port)->line_number = scm_to_long (line); |
564478fd | 1595 | return SCM_UNSPECIFIED; |
d043d8c2 | 1596 | } |
1bbd0b84 | 1597 | #undef FUNC_NAME |
d043d8c2 | 1598 | |
a1ec6916 | 1599 | SCM_DEFINE (scm_port_column, "port-column", 1, 0, 0, |
1bbd0b84 | 1600 | (SCM port), |
a150979d KR |
1601 | "Return the current column number of @var{port}.\n" |
1602 | "If the number is\n" | |
b380b885 MD |
1603 | "unknown, the result is #f. Otherwise, the result is a 0-origin integer\n" |
1604 | "- i.e. the first character of the first line is line 0, column 0.\n" | |
1605 | "(However, when you display a file position, for example in an error\n" | |
650a1cf9 | 1606 | "message, we recommend you add 1 to get 1-origin integers. This is\n" |
b380b885 MD |
1607 | "because lines and column numbers traditionally start with 1, and that is\n" |
1608 | "what non-programmers will find most natural.)") | |
1bbd0b84 | 1609 | #define FUNC_NAME s_scm_port_column |
0f2d19dd | 1610 | { |
78446828 | 1611 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 1612 | SCM_VALIDATE_OPENPORT (1, port); |
e11e83f3 | 1613 | return scm_from_int (SCM_COL (port)); |
0f2d19dd | 1614 | } |
1bbd0b84 | 1615 | #undef FUNC_NAME |
0f2d19dd | 1616 | |
a1ec6916 | 1617 | SCM_DEFINE (scm_set_port_column_x, "set-port-column!", 2, 0, 0, |
1bbd0b84 | 1618 | (SCM port, SCM column), |
a150979d KR |
1619 | "Set the current column of @var{port}. Before reading the first\n" |
1620 | "character on a line the column should be 0.") | |
1bbd0b84 | 1621 | #define FUNC_NAME s_scm_set_port_column_x |
d043d8c2 | 1622 | { |
360fc44c | 1623 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 1624 | SCM_VALIDATE_OPENPORT (1, port); |
a55c2b68 | 1625 | SCM_PTAB_ENTRY (port)->column_number = scm_to_int (column); |
564478fd | 1626 | return SCM_UNSPECIFIED; |
d043d8c2 | 1627 | } |
1bbd0b84 | 1628 | #undef FUNC_NAME |
d043d8c2 | 1629 | |
a1ec6916 | 1630 | SCM_DEFINE (scm_port_filename, "port-filename", 1, 0, 0, |
1bbd0b84 | 1631 | (SCM port), |
b380b885 | 1632 | "Return the filename associated with @var{port}. This function returns\n" |
2a2a730b | 1633 | "the strings \"standard input\", \"standard output\" and \"standard error\"\n" |
a3c8b9fc | 1634 | "when called on the current input, output and error ports respectively.") |
1bbd0b84 | 1635 | #define FUNC_NAME s_scm_port_filename |
0f2d19dd | 1636 | { |
78446828 | 1637 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 1638 | SCM_VALIDATE_OPENPORT (1, port); |
b24b5e13 | 1639 | return SCM_FILENAME (port); |
0f2d19dd | 1640 | } |
1bbd0b84 | 1641 | #undef FUNC_NAME |
0f2d19dd | 1642 | |
a1ec6916 | 1643 | SCM_DEFINE (scm_set_port_filename_x, "set-port-filename!", 2, 0, 0, |
1bbd0b84 | 1644 | (SCM port, SCM filename), |
b380b885 MD |
1645 | "Change the filename associated with @var{port}, using the current input\n" |
1646 | "port if none is specified. Note that this does not change the port's\n" | |
1647 | "source of data, but only the value that is returned by\n" | |
1648 | "@code{port-filename} and reported in diagnostic output.") | |
1bbd0b84 | 1649 | #define FUNC_NAME s_scm_set_port_filename_x |
d14af9f2 | 1650 | { |
360fc44c | 1651 | port = SCM_COERCE_OUTPORT (port); |
34d19ef6 | 1652 | SCM_VALIDATE_OPENPORT (1, port); |
360fc44c | 1653 | /* We allow the user to set the filename to whatever he likes. */ |
b24b5e13 DH |
1654 | SCM_SET_FILENAME (port, filename); |
1655 | return SCM_UNSPECIFIED; | |
d14af9f2 | 1656 | } |
1bbd0b84 | 1657 | #undef FUNC_NAME |
d14af9f2 | 1658 | |
f12733c9 MD |
1659 | void |
1660 | scm_print_port_mode (SCM exp, SCM port) | |
1661 | { | |
1662 | scm_puts (SCM_CLOSEDP (exp) | |
1663 | ? "closed: " | |
f9a64404 DH |
1664 | : (SCM_RDNG & SCM_CELL_WORD_0 (exp) |
1665 | ? (SCM_WRTNG & SCM_CELL_WORD_0 (exp) | |
f12733c9 MD |
1666 | ? "input-output: " |
1667 | : "input: ") | |
f9a64404 | 1668 | : (SCM_WRTNG & SCM_CELL_WORD_0 (exp) |
f12733c9 MD |
1669 | ? "output: " |
1670 | : "bogus: ")), | |
1671 | port); | |
1672 | } | |
1cc91f1b | 1673 | |
f12733c9 | 1674 | int |
e81d98ec | 1675 | scm_port_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) |
0f2d19dd | 1676 | { |
f12733c9 MD |
1677 | char *type = SCM_PTOBNAME (SCM_PTOBNUM (exp)); |
1678 | if (!type) | |
1679 | type = "port"; | |
b7f3516f | 1680 | scm_puts ("#<", port); |
f12733c9 | 1681 | scm_print_port_mode (exp, port); |
b7f3516f TT |
1682 | scm_puts (type, port); |
1683 | scm_putc (' ', port); | |
0345e278 | 1684 | scm_uintprint (SCM_CELL_WORD_1 (exp), 16, port); |
b7f3516f | 1685 | scm_putc ('>', port); |
f12733c9 | 1686 | return 1; |
0f2d19dd JB |
1687 | } |
1688 | ||
0f2d19dd JB |
1689 | void |
1690 | scm_ports_prehistory () | |
0f2d19dd JB |
1691 | { |
1692 | scm_numptob = 0; | |
67329a9e | 1693 | scm_ptobs = (scm_t_ptob_descriptor *) scm_malloc (sizeof (scm_t_ptob_descriptor)); |
0f2d19dd | 1694 | } |
0f2d19dd JB |
1695 | |
1696 | \f | |
ee149d03 | 1697 | |
d68fee48 | 1698 | /* Void ports. */ |
0f2d19dd | 1699 | |
92c2555f | 1700 | scm_t_bits scm_tc16_void_port = 0; |
0f2d19dd | 1701 | |
e81d98ec | 1702 | static int fill_input_void_port (SCM port SCM_UNUSED) |
283a1a0e | 1703 | { |
70df8af6 | 1704 | return EOF; |
283a1a0e GH |
1705 | } |
1706 | ||
31703ab8 | 1707 | static void |
e81d98ec DH |
1708 | write_void_port (SCM port SCM_UNUSED, |
1709 | const void *data SCM_UNUSED, | |
1710 | size_t size SCM_UNUSED) | |
31703ab8 GH |
1711 | { |
1712 | } | |
1713 | ||
d617ee18 MV |
1714 | static SCM |
1715 | scm_i_void_port (long mode_bits) | |
0f2d19dd | 1716 | { |
9de87eea | 1717 | scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex); |
402788a9 | 1718 | { |
da220f27 HWN |
1719 | SCM answer = scm_new_port_table_entry (scm_tc16_void_port); |
1720 | scm_t_port * pt = SCM_PTAB_ENTRY(answer); | |
1721 | ||
402788a9 | 1722 | scm_port_non_buffer (pt); |
402788a9 HWN |
1723 | |
1724 | SCM_SETSTREAM (answer, 0); | |
1725 | SCM_SET_CELL_TYPE (answer, scm_tc16_void_port | mode_bits); | |
9de87eea | 1726 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
402788a9 HWN |
1727 | return answer; |
1728 | } | |
0f2d19dd JB |
1729 | } |
1730 | ||
d617ee18 MV |
1731 | SCM |
1732 | scm_void_port (char *mode_str) | |
1733 | { | |
1734 | return scm_i_void_port (scm_mode_bits (mode_str)); | |
1735 | } | |
1736 | ||
a1ec6916 | 1737 | SCM_DEFINE (scm_sys_make_void_port, "%make-void-port", 1, 0, 0, |
1bbd0b84 | 1738 | (SCM mode), |
70df8af6 | 1739 | "Create and return a new void port. A void port acts like\n" |
bb2c02f2 | 1740 | "@file{/dev/null}. The @var{mode} argument\n" |
70df8af6 | 1741 | "specifies the input/output modes for this port: see the\n" |
b380b885 | 1742 | "documentation for @code{open-file} in @ref{File Ports}.") |
1bbd0b84 | 1743 | #define FUNC_NAME s_scm_sys_make_void_port |
0f2d19dd | 1744 | { |
d617ee18 | 1745 | return scm_i_void_port (scm_i_mode_bits (mode)); |
0f2d19dd | 1746 | } |
1bbd0b84 | 1747 | #undef FUNC_NAME |
0f2d19dd | 1748 | |
0f2d19dd | 1749 | \f |
89545eba | 1750 | /* Initialization. */ |
1cc91f1b | 1751 | |
0f2d19dd JB |
1752 | void |
1753 | scm_init_ports () | |
0f2d19dd | 1754 | { |
840ae05d | 1755 | /* lseek() symbols. */ |
e11e83f3 MV |
1756 | scm_c_define ("SEEK_SET", scm_from_int (SEEK_SET)); |
1757 | scm_c_define ("SEEK_CUR", scm_from_int (SEEK_CUR)); | |
1758 | scm_c_define ("SEEK_END", scm_from_int (SEEK_END)); | |
840ae05d | 1759 | |
70df8af6 GH |
1760 | scm_tc16_void_port = scm_make_port_type ("void", fill_input_void_port, |
1761 | write_void_port); | |
9de87eea MV |
1762 | |
1763 | cur_inport_fluid = scm_permanent_object (scm_make_fluid ()); | |
1764 | cur_outport_fluid = scm_permanent_object (scm_make_fluid ()); | |
1765 | cur_errport_fluid = scm_permanent_object (scm_make_fluid ()); | |
1766 | cur_loadport_fluid = scm_permanent_object (scm_make_fluid ()); | |
1767 | ||
5dbc6c06 HWN |
1768 | scm_i_port_weak_hash = scm_permanent_object (scm_make_weak_key_hash_table (SCM_I_MAKINUM(31))); |
1769 | ||
a0599745 | 1770 | #include "libguile/ports.x" |
0f2d19dd | 1771 | } |
89e00824 ML |
1772 | |
1773 | /* | |
1774 | Local Variables: | |
1775 | c-file-style: "gnu" | |
1776 | End: | |
1777 | */ |