Commit | Line | Data |
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fd08c236 | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
0f2d19dd | 2 | * |
73be1d9e MV |
3 | * This library is free software; you can redistribute it and/or |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
0f2d19dd | 7 | * |
73be1d9e MV |
8 | * This library 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 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 | |
15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
16 | */ | |
1bbd0b84 | 17 | |
1bbd0b84 | 18 | |
0f2d19dd | 19 | \f |
85286595 RB |
20 | #if HAVE_CONFIG_H |
21 | # include <config.h> | |
22 | #endif | |
0f2d19dd JB |
23 | |
24 | #include <stdio.h> | |
cb63cf9e | 25 | #include <fcntl.h> |
a0599745 MD |
26 | #include "libguile/_scm.h" |
27 | #include "libguile/strings.h" | |
a0599745 | 28 | #include "libguile/validate.h" |
6b72ac1d | 29 | #include "libguile/gc.h" |
7f9994d9 | 30 | #include "libguile/dynwind.h" |
6b72ac1d | 31 | |
a0599745 | 32 | #include "libguile/fports.h" |
95b88819 GH |
33 | |
34 | #ifdef HAVE_STRING_H | |
35 | #include <string.h> | |
36 | #endif | |
0f2d19dd JB |
37 | #ifdef HAVE_UNISTD_H |
38 | #include <unistd.h> | |
39 | #else | |
1be6b49c | 40 | size_t fwrite (); |
0f2d19dd | 41 | #endif |
b8b17bfd MV |
42 | #ifdef HAVE_IO_H |
43 | #include <io.h> | |
44 | #endif | |
f47a5239 | 45 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
cb63cf9e JB |
46 | #include <sys/stat.h> |
47 | #endif | |
0f2d19dd | 48 | |
cb63cf9e | 49 | #include <errno.h> |
e145dd02 | 50 | |
a0599745 | 51 | #include "libguile/iselect.h" |
edb810bb SJ |
52 | |
53 | /* Some defines for Windows (native port, not Cygwin). */ | |
82893676 MG |
54 | #ifdef __MINGW32__ |
55 | # include <sys/stat.h> | |
56 | # include <winsock2.h> | |
57 | # define ftruncate(fd, size) chsize (fd, size) | |
58 | #endif /* __MINGW32__ */ | |
cb63cf9e | 59 | |
a98bddfd | 60 | |
92c2555f | 61 | scm_t_bits scm_tc16_fport; |
a98bddfd DH |
62 | |
63 | ||
19b27fa2 | 64 | /* default buffer size, used if the O/S won't supply a value. */ |
1be6b49c | 65 | static const size_t default_buffer_size = 1024; |
19b27fa2 | 66 | |
cb63cf9e JB |
67 | /* create FPORT buffer with specified sizes (or -1 to use default size or |
68 | 0 for no buffer. */ | |
69 | static void | |
c014a02e | 70 | scm_fport_buffer_add (SCM port, long read_size, int write_size) |
c6c79933 | 71 | #define FUNC_NAME "scm_fport_buffer_add" |
e145dd02 | 72 | { |
92c2555f | 73 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
e145dd02 | 74 | |
cb63cf9e JB |
75 | if (read_size == -1 || write_size == -1) |
76 | { | |
1be6b49c | 77 | size_t default_size; |
f47a5239 | 78 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
cb63cf9e | 79 | struct stat st; |
b8b17bfd | 80 | scm_t_fport *fp = SCM_FSTREAM (port); |
cb63cf9e | 81 | |
19b27fa2 GH |
82 | default_size = (fstat (fp->fdes, &st) == -1) ? default_buffer_size |
83 | : st.st_blksize; | |
cb63cf9e | 84 | #else |
19b27fa2 | 85 | default_size = default_buffer_size; |
cb63cf9e JB |
86 | #endif |
87 | if (read_size == -1) | |
88 | read_size = default_size; | |
89 | if (write_size == -1) | |
90 | write_size = default_size; | |
91 | } | |
0f2d19dd | 92 | |
f5f2dcff | 93 | if (SCM_INPUT_PORT_P (port) && read_size > 0) |
cb63cf9e | 94 | { |
4c9419ac | 95 | pt->read_buf = scm_gc_malloc (read_size, "port buffer"); |
cb63cf9e JB |
96 | pt->read_pos = pt->read_end = pt->read_buf; |
97 | pt->read_buf_size = read_size; | |
98 | } | |
99 | else | |
100 | { | |
840ae05d | 101 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; |
cb63cf9e JB |
102 | pt->read_buf_size = 1; |
103 | } | |
1717856b | 104 | |
f5f2dcff | 105 | if (SCM_OUTPUT_PORT_P (port) && write_size > 0) |
cb63cf9e | 106 | { |
4c9419ac | 107 | pt->write_buf = scm_gc_malloc (write_size, "port buffer"); |
cb63cf9e JB |
108 | pt->write_pos = pt->write_buf; |
109 | pt->write_buf_size = write_size; | |
110 | } | |
111 | else | |
112 | { | |
113 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
114 | pt->write_buf_size = 1; | |
115 | } | |
116 | ||
117 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
118 | if (read_size > 0 || write_size > 0) | |
54778cd3 | 119 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0); |
cb63cf9e | 120 | else |
54778cd3 | 121 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUF0); |
7a6f1ffa | 122 | } |
c6c79933 | 123 | #undef FUNC_NAME |
7a6f1ffa | 124 | |
a1ec6916 | 125 | SCM_DEFINE (scm_setvbuf, "setvbuf", 2, 1, 0, |
1bbd0b84 | 126 | (SCM port, SCM mode, SCM size), |
fc0d72d4 MD |
127 | "Set the buffering mode for @var{port}. @var{mode} can be:\n" |
128 | "@table @code\n" | |
129 | "@item _IONBF\n" | |
130 | "non-buffered\n" | |
131 | "@item _IOLBF\n" | |
132 | "line buffered\n" | |
133 | "@item _IOFBF\n" | |
134 | "block buffered, using a newly allocated buffer of @var{size} bytes.\n" | |
135 | "If @var{size} is omitted, a default size will be used.\n" | |
2c1ae20e | 136 | "@end table") |
1bbd0b84 | 137 | #define FUNC_NAME s_scm_setvbuf |
7a6f1ffa | 138 | { |
1be6b49c | 139 | int cmode; |
c014a02e | 140 | long csize; |
92c2555f | 141 | scm_t_port *pt; |
7a6f1ffa | 142 | |
78446828 MV |
143 | port = SCM_COERCE_OUTPORT (port); |
144 | ||
3b3b36dd | 145 | SCM_VALIDATE_OPFPORT (1,port); |
a55c2b68 | 146 | cmode = scm_to_int (mode); |
d3639214 | 147 | if (cmode != _IONBF && cmode != _IOFBF && cmode != _IOLBF) |
1bbd0b84 | 148 | scm_out_of_range (FUNC_NAME, mode); |
d3639214 GH |
149 | |
150 | if (cmode == _IOLBF) | |
151 | { | |
54778cd3 | 152 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUFLINE); |
d3639214 GH |
153 | cmode = _IOFBF; |
154 | } | |
155 | else | |
156 | { | |
54778cd3 | 157 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) ^ SCM_BUFLINE); |
d3639214 GH |
158 | } |
159 | ||
7a6f1ffa | 160 | if (SCM_UNBNDP (size)) |
cb63cf9e JB |
161 | { |
162 | if (cmode == _IOFBF) | |
163 | csize = -1; | |
164 | else | |
165 | csize = 0; | |
166 | } | |
7a6f1ffa GH |
167 | else |
168 | { | |
a55c2b68 | 169 | csize = scm_to_int (size); |
cb63cf9e | 170 | if (csize < 0 || (cmode == _IONBF && csize > 0)) |
1bbd0b84 | 171 | scm_out_of_range (FUNC_NAME, size); |
7a6f1ffa | 172 | } |
d3639214 | 173 | |
cb63cf9e | 174 | pt = SCM_PTAB_ENTRY (port); |
7a6f1ffa | 175 | |
4c9419ac MV |
176 | /* silently discards buffered and put-back chars. */ |
177 | if (pt->read_buf == pt->putback_buf) | |
178 | { | |
179 | pt->read_buf = pt->saved_read_buf; | |
180 | pt->read_pos = pt->saved_read_pos; | |
181 | pt->read_end = pt->saved_read_end; | |
182 | pt->read_buf_size = pt->saved_read_buf_size; | |
183 | } | |
cb63cf9e | 184 | if (pt->read_buf != &pt->shortbuf) |
4c9419ac | 185 | scm_gc_free (pt->read_buf, pt->read_buf_size, "port buffer"); |
cb63cf9e | 186 | if (pt->write_buf != &pt->shortbuf) |
4c9419ac | 187 | scm_gc_free (pt->write_buf, pt->write_buf_size, "port buffer"); |
7a6f1ffa | 188 | |
cb63cf9e JB |
189 | scm_fport_buffer_add (port, csize, csize); |
190 | return SCM_UNSPECIFIED; | |
0f2d19dd | 191 | } |
1bbd0b84 | 192 | #undef FUNC_NAME |
0f2d19dd | 193 | |
eadd48de | 194 | /* Move ports with the specified file descriptor to new descriptors, |
387d418c | 195 | * resetting the revealed count to 0. |
0f2d19dd | 196 | */ |
1717856b | 197 | |
eadd48de | 198 | void |
6e8d25a6 | 199 | scm_evict_ports (int fd) |
0f2d19dd | 200 | { |
c014a02e | 201 | long i; |
0f2d19dd | 202 | |
b9ad392e MD |
203 | scm_mutex_lock (&scm_i_port_table_mutex); |
204 | ||
67329a9e | 205 | for (i = 0; i < scm_i_port_table_size; i++) |
eadd48de | 206 | { |
67329a9e | 207 | SCM port = scm_i_port_table[i]->port; |
cb63cf9e JB |
208 | |
209 | if (SCM_FPORTP (port)) | |
eadd48de | 210 | { |
92c2555f | 211 | scm_t_fport *fp = SCM_FSTREAM (port); |
cb63cf9e JB |
212 | |
213 | if (fp->fdes == fd) | |
214 | { | |
215 | fp->fdes = dup (fd); | |
216 | if (fp->fdes == -1) | |
217 | scm_syserror ("scm_evict_ports"); | |
e11e83f3 | 218 | scm_set_port_revealed_x (port, scm_from_int (0)); |
cb63cf9e | 219 | } |
eadd48de GH |
220 | } |
221 | } | |
b9ad392e MD |
222 | |
223 | scm_mutex_unlock (&scm_i_port_table_mutex); | |
eadd48de | 224 | } |
0f2d19dd | 225 | |
efa40607 DH |
226 | |
227 | SCM_DEFINE (scm_file_port_p, "file-port?", 1, 0, 0, | |
228 | (SCM obj), | |
2069af38 | 229 | "Determine whether @var{obj} is a port that is related to a file.") |
efa40607 DH |
230 | #define FUNC_NAME s_scm_file_port_p |
231 | { | |
7888309b | 232 | return scm_from_bool (SCM_FPORTP (obj)); |
efa40607 DH |
233 | } |
234 | #undef FUNC_NAME | |
235 | ||
236 | ||
0f2d19dd JB |
237 | /* scm_open_file |
238 | * Return a new port open on a given file. | |
239 | * | |
240 | * The mode string must match the pattern: [rwa+]** which | |
241 | * is interpreted in the usual unix way. | |
242 | * | |
243 | * Return the new port. | |
244 | */ | |
3b3b36dd | 245 | SCM_DEFINE (scm_open_file, "open-file", 2, 0, 0, |
1e6808ea MG |
246 | (SCM filename, SCM mode), |
247 | "Open the file whose name is @var{filename}, and return a port\n" | |
fc0d72d4 | 248 | "representing that file. The attributes of the port are\n" |
1e6808ea MG |
249 | "determined by the @var{mode} string. The way in which this is\n" |
250 | "interpreted is similar to C stdio. The first character must be\n" | |
251 | "one of the following:\n" | |
fc0d72d4 MD |
252 | "@table @samp\n" |
253 | "@item r\n" | |
254 | "Open an existing file for input.\n" | |
255 | "@item w\n" | |
256 | "Open a file for output, creating it if it doesn't already exist\n" | |
257 | "or removing its contents if it does.\n" | |
258 | "@item a\n" | |
1e6808ea MG |
259 | "Open a file for output, creating it if it doesn't already\n" |
260 | "exist. All writes to the port will go to the end of the file.\n" | |
fc0d72d4 MD |
261 | "The \"append mode\" can be turned off while the port is in use\n" |
262 | "@pxref{Ports and File Descriptors, fcntl}\n" | |
1e6808ea MG |
263 | "@end table\n" |
264 | "The following additional characters can be appended:\n" | |
fc0d72d4 MD |
265 | "@table @samp\n" |
266 | "@item +\n" | |
267 | "Open the port for both input and output. E.g., @code{r+}: open\n" | |
268 | "an existing file for both input and output.\n" | |
269 | "@item 0\n" | |
1e6808ea MG |
270 | "Create an \"unbuffered\" port. In this case input and output\n" |
271 | "operations are passed directly to the underlying port\n" | |
272 | "implementation without additional buffering. This is likely to\n" | |
273 | "slow down I/O operations. The buffering mode can be changed\n" | |
274 | "while a port is in use @pxref{Ports and File Descriptors,\n" | |
275 | "setvbuf}\n" | |
fc0d72d4 MD |
276 | "@item l\n" |
277 | "Add line-buffering to the port. The port output buffer will be\n" | |
278 | "automatically flushed whenever a newline character is written.\n" | |
1e6808ea MG |
279 | "@end table\n" |
280 | "In theory we could create read/write ports which were buffered\n" | |
281 | "in one direction only. However this isn't included in the\n" | |
282 | "current interfaces. If a file cannot be opened with the access\n" | |
283 | "requested, @code{open-file} throws an exception.") | |
1bbd0b84 | 284 | #define FUNC_NAME s_scm_open_file |
0f2d19dd | 285 | { |
19639113 | 286 | SCM port; |
cb63cf9e JB |
287 | int fdes; |
288 | int flags = 0; | |
19639113 | 289 | char *file; |
1e6808ea | 290 | char *md; |
cb63cf9e | 291 | char *ptr; |
19639113 | 292 | |
7f9994d9 | 293 | scm_frame_begin (0); |
19639113 | 294 | |
7f9994d9 MV |
295 | file = scm_to_locale_string (filename); |
296 | scm_frame_free (file); | |
297 | ||
298 | md = scm_to_locale_string (mode); | |
299 | scm_frame_free (md); | |
19639113 | 300 | |
1e6808ea | 301 | switch (*md) |
0f2d19dd | 302 | { |
cb63cf9e JB |
303 | case 'r': |
304 | flags |= O_RDONLY; | |
305 | break; | |
306 | case 'w': | |
307 | flags |= O_WRONLY | O_CREAT | O_TRUNC; | |
308 | break; | |
309 | case 'a': | |
310 | flags |= O_WRONLY | O_CREAT | O_APPEND; | |
311 | break; | |
312 | default: | |
1e6808ea | 313 | scm_out_of_range (FUNC_NAME, mode); |
0f2d19dd | 314 | } |
1e6808ea | 315 | ptr = md + 1; |
cb63cf9e | 316 | while (*ptr != '\0') |
e145dd02 | 317 | { |
cb63cf9e JB |
318 | switch (*ptr) |
319 | { | |
320 | case '+': | |
321 | flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR; | |
322 | break; | |
9f561420 GH |
323 | case 'b': |
324 | #if defined (O_BINARY) | |
325 | flags |= O_BINARY; | |
326 | #endif | |
327 | break; | |
cb63cf9e | 328 | case '0': /* unbuffered: handled later. */ |
d3639214 | 329 | case 'l': /* line buffered: handled during output. */ |
cb63cf9e JB |
330 | break; |
331 | default: | |
1e6808ea | 332 | scm_out_of_range (FUNC_NAME, mode); |
cb63cf9e JB |
333 | } |
334 | ptr++; | |
e145dd02 | 335 | } |
cb63cf9e JB |
336 | SCM_SYSCALL (fdes = open (file, flags, 0666)); |
337 | if (fdes == -1) | |
e145dd02 | 338 | { |
cb63cf9e JB |
339 | int en = errno; |
340 | ||
5d2d2ffc | 341 | SCM_SYSERROR_MSG ("~A: ~S", |
fd08c236 | 342 | scm_cons (scm_strerror (scm_from_int (en)), |
5d2d2ffc | 343 | scm_cons (filename, SCM_EOL)), en); |
0f2d19dd | 344 | } |
1e6808ea | 345 | port = scm_fdes_to_port (fdes, md, filename); |
7f9994d9 MV |
346 | |
347 | scm_frame_end (); | |
348 | ||
0f2d19dd JB |
349 | return port; |
350 | } | |
1bbd0b84 | 351 | #undef FUNC_NAME |
0f2d19dd | 352 | |
e145dd02 | 353 | \f |
82893676 MG |
354 | #ifdef __MINGW32__ |
355 | /* | |
356 | * Try getting the appropiate file flags for a given file descriptor | |
357 | * under Windows. This incorporates some fancy operations because Windows | |
358 | * differentiates between file, pipe and socket descriptors. | |
359 | */ | |
360 | #ifndef O_ACCMODE | |
361 | # define O_ACCMODE 0x0003 | |
362 | #endif | |
363 | ||
364 | static int getflags (int fdes) | |
365 | { | |
366 | int flags = 0; | |
367 | struct stat buf; | |
368 | int error, optlen = sizeof (int); | |
369 | ||
370 | /* Is this a socket ? */ | |
371 | if (getsockopt (fdes, SOL_SOCKET, SO_ERROR, (void *) &error, &optlen) >= 0) | |
372 | flags = O_RDWR; | |
373 | /* Maybe a regular file ? */ | |
374 | else if (fstat (fdes, &buf) < 0) | |
375 | flags = -1; | |
376 | else | |
377 | { | |
378 | /* Or an anonymous pipe handle ? */ | |
b8b17bfd | 379 | if (buf.st_mode & _S_IFIFO) |
8f99e3f3 SJ |
380 | flags = PeekNamedPipe ((HANDLE) _get_osfhandle (fdes), NULL, 0, |
381 | NULL, NULL, NULL) ? O_RDONLY : O_WRONLY; | |
82893676 | 382 | /* stdin ? */ |
b8b17bfd | 383 | else if (fdes == fileno (stdin) && isatty (fdes)) |
82893676 MG |
384 | flags = O_RDONLY; |
385 | /* stdout / stderr ? */ | |
b8b17bfd MV |
386 | else if ((fdes == fileno (stdout) || fdes == fileno (stderr)) && |
387 | isatty (fdes)) | |
82893676 MG |
388 | flags = O_WRONLY; |
389 | else | |
390 | flags = buf.st_mode; | |
391 | } | |
392 | return flags; | |
393 | } | |
394 | #endif /* __MINGW32__ */ | |
395 | ||
cb63cf9e | 396 | /* Building Guile ports from a file descriptor. */ |
e145dd02 | 397 | |
cb63cf9e | 398 | /* Build a Scheme port from an open file descriptor `fdes'. |
a089567e JB |
399 | MODE indicates whether FILE is open for reading or writing; it uses |
400 | the same notation as open-file's second argument. | |
19b27fa2 GH |
401 | NAME is a string to be used as the port's filename. |
402 | */ | |
a089567e | 403 | SCM |
cb63cf9e | 404 | scm_fdes_to_port (int fdes, char *mode, SCM name) |
19b27fa2 | 405 | #define FUNC_NAME "scm_fdes_to_port" |
a089567e JB |
406 | { |
407 | long mode_bits = scm_mode_bits (mode); | |
408 | SCM port; | |
92c2555f | 409 | scm_t_port *pt; |
19b27fa2 GH |
410 | int flags; |
411 | ||
412 | /* test that fdes is valid. */ | |
82893676 MG |
413 | #ifdef __MINGW32__ |
414 | flags = getflags (fdes); | |
415 | #else | |
19b27fa2 | 416 | flags = fcntl (fdes, F_GETFL, 0); |
82893676 | 417 | #endif |
19b27fa2 GH |
418 | if (flags == -1) |
419 | SCM_SYSERROR; | |
420 | flags &= O_ACCMODE; | |
421 | if (flags != O_RDWR | |
422 | && ((flags != O_WRONLY && (mode_bits & SCM_WRTNG)) | |
423 | || (flags != O_RDONLY && (mode_bits & SCM_RDNG)))) | |
424 | { | |
425 | SCM_MISC_ERROR ("requested file mode not available on fdes", SCM_EOL); | |
426 | } | |
a089567e | 427 | |
b9ad392e | 428 | scm_mutex_lock (&scm_i_port_table_mutex); |
da220f27 HWN |
429 | |
430 | port = scm_new_port_table_entry (scm_tc16_fport); | |
431 | SCM_SET_CELL_TYPE(port, scm_tc16_fport | mode_bits); | |
432 | pt = SCM_PTAB_ENTRY(port); | |
a089567e | 433 | { |
92c2555f | 434 | scm_t_fport *fp |
4c9419ac | 435 | = (scm_t_fport *) scm_gc_malloc (sizeof (scm_t_fport), "file port"); |
c6c79933 | 436 | |
cb63cf9e | 437 | fp->fdes = fdes; |
0de97b83 | 438 | pt->rw_random = SCM_FDES_RANDOM_P (fdes); |
cb63cf9e JB |
439 | SCM_SETSTREAM (port, fp); |
440 | if (mode_bits & SCM_BUF0) | |
441 | scm_fport_buffer_add (port, 0, 0); | |
442 | else | |
443 | scm_fport_buffer_add (port, -1, -1); | |
a089567e | 444 | } |
b24b5e13 | 445 | SCM_SET_FILENAME (port, name); |
b9ad392e | 446 | scm_mutex_unlock (&scm_i_port_table_mutex); |
e145dd02 JB |
447 | return port; |
448 | } | |
19b27fa2 | 449 | #undef FUNC_NAME |
e145dd02 | 450 | |
affc96b5 | 451 | /* Return a lower bound on the number of bytes available for input. */ |
cb63cf9e | 452 | static int |
affc96b5 | 453 | fport_input_waiting (SCM port) |
e145dd02 | 454 | { |
cb63cf9e JB |
455 | int fdes = SCM_FSTREAM (port)->fdes; |
456 | ||
457 | #ifdef HAVE_SELECT | |
458 | struct timeval timeout; | |
459 | SELECT_TYPE read_set; | |
460 | SELECT_TYPE write_set; | |
461 | SELECT_TYPE except_set; | |
462 | ||
463 | FD_ZERO (&read_set); | |
464 | FD_ZERO (&write_set); | |
465 | FD_ZERO (&except_set); | |
466 | ||
467 | FD_SET (fdes, &read_set); | |
468 | ||
469 | timeout.tv_sec = 0; | |
470 | timeout.tv_usec = 0; | |
471 | ||
472 | if (select (SELECT_SET_SIZE, | |
473 | &read_set, &write_set, &except_set, &timeout) | |
474 | < 0) | |
affc96b5 GH |
475 | scm_syserror ("fport_input_waiting"); |
476 | return FD_ISSET (fdes, &read_set) ? 1 : 0; | |
cb63cf9e JB |
477 | #elif defined (FIONREAD) |
478 | int remir; | |
479 | ioctl(fdes, FIONREAD, &remir); | |
480 | return remir; | |
481 | #else | |
affc96b5 | 482 | scm_misc_error ("fport_input_waiting", |
cb63cf9e JB |
483 | "Not fully implemented on this platform", |
484 | SCM_EOL); | |
485 | #endif | |
a089567e JB |
486 | } |
487 | ||
cb63cf9e | 488 | \f |
0f2d19dd | 489 | static int |
e81d98ec | 490 | fport_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) |
0f2d19dd | 491 | { |
b3ec3c64 MD |
492 | scm_puts ("#<", port); |
493 | scm_print_port_mode (exp, port); | |
494 | if (SCM_OPFPORTP (exp)) | |
0f2d19dd | 495 | { |
b3ec3c64 | 496 | int fdes; |
b24b5e13 | 497 | SCM name = SCM_FILENAME (exp); |
7f9994d9 | 498 | if (scm_is_string (name) || SCM_SYMBOLP (name)) |
b24b5e13 DH |
499 | scm_display (name, port); |
500 | else | |
501 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); | |
b3ec3c64 MD |
502 | scm_putc (' ', port); |
503 | fdes = (SCM_FSTREAM (exp))->fdes; | |
504 | ||
82893676 | 505 | #ifdef HAVE_TTYNAME |
b3ec3c64 MD |
506 | if (isatty (fdes)) |
507 | scm_puts (ttyname (fdes), port); | |
508 | else | |
82893676 | 509 | #endif /* HAVE_TTYNAME */ |
b3ec3c64 | 510 | scm_intprint (fdes, 10, port); |
0f2d19dd JB |
511 | } |
512 | else | |
513 | { | |
b3ec3c64 MD |
514 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); |
515 | scm_putc (' ', port); | |
63bcad19 | 516 | scm_intprint ((scm_t_bits) SCM_PTAB_ENTRY (exp), 16, port); |
0f2d19dd | 517 | } |
b3ec3c64 MD |
518 | scm_putc ('>', port); |
519 | return 1; | |
0f2d19dd JB |
520 | } |
521 | ||
2e945bcc | 522 | #ifndef __MINGW32__ |
cb63cf9e JB |
523 | /* thread-local block for input on fport's fdes. */ |
524 | static void | |
525 | fport_wait_for_input (SCM port) | |
3cb988bd | 526 | { |
cb63cf9e | 527 | int fdes = SCM_FSTREAM (port)->fdes; |
3cb988bd | 528 | |
affc96b5 | 529 | if (!fport_input_waiting (port)) |
8122b543 | 530 | { |
cb63cf9e JB |
531 | int n; |
532 | SELECT_TYPE readfds; | |
533 | int flags = fcntl (fdes, F_GETFL); | |
534 | ||
535 | if (flags == -1) | |
536 | scm_syserror ("scm_fdes_wait_for_input"); | |
537 | if (!(flags & O_NONBLOCK)) | |
538 | do | |
539 | { | |
540 | FD_ZERO (&readfds); | |
541 | FD_SET (fdes, &readfds); | |
542 | n = scm_internal_select (fdes + 1, &readfds, NULL, NULL, NULL); | |
543 | } | |
544 | while (n == -1 && errno == EINTR); | |
8122b543 | 545 | } |
3cb988bd | 546 | } |
2e945bcc | 547 | #endif /* !__MINGW32__ */ |
0f2d19dd | 548 | |
affc96b5 | 549 | static void fport_flush (SCM port); |
0f2d19dd | 550 | |
c2da2648 GH |
551 | /* fill a port's read-buffer with a single read. returns the first |
552 | char or EOF if end of file. */ | |
0f2d19dd | 553 | static int |
affc96b5 | 554 | fport_fill_input (SCM port) |
0f2d19dd | 555 | { |
c014a02e | 556 | long count; |
92c2555f MV |
557 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
558 | scm_t_fport *fp = SCM_FSTREAM (port); | |
cb63cf9e | 559 | |
2e945bcc | 560 | #ifndef __MINGW32__ |
cb63cf9e | 561 | fport_wait_for_input (port); |
2e945bcc | 562 | #endif /* !__MINGW32__ */ |
cb63cf9e JB |
563 | SCM_SYSCALL (count = read (fp->fdes, pt->read_buf, pt->read_buf_size)); |
564 | if (count == -1) | |
affc96b5 | 565 | scm_syserror ("fport_fill_input"); |
cb63cf9e JB |
566 | if (count == 0) |
567 | return EOF; | |
568 | else | |
569 | { | |
5c070ca7 | 570 | pt->read_pos = pt->read_buf; |
cb63cf9e | 571 | pt->read_end = pt->read_buf + count; |
5c070ca7 | 572 | return *pt->read_buf; |
cb63cf9e | 573 | } |
0f2d19dd JB |
574 | } |
575 | ||
cb63cf9e | 576 | static off_t |
affc96b5 | 577 | fport_seek (SCM port, off_t offset, int whence) |
0f2d19dd | 578 | { |
92c2555f MV |
579 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
580 | scm_t_fport *fp = SCM_FSTREAM (port); | |
7dcb364d GH |
581 | off_t rv; |
582 | off_t result; | |
583 | ||
584 | if (pt->rw_active == SCM_PORT_WRITE) | |
585 | { | |
586 | if (offset != 0 || whence != SEEK_CUR) | |
587 | { | |
588 | fport_flush (port); | |
589 | result = rv = lseek (fp->fdes, offset, whence); | |
590 | } | |
591 | else | |
592 | { | |
593 | /* read current position without disturbing the buffer. */ | |
594 | rv = lseek (fp->fdes, offset, whence); | |
595 | result = rv + (pt->write_pos - pt->write_buf); | |
596 | } | |
597 | } | |
598 | else if (pt->rw_active == SCM_PORT_READ) | |
599 | { | |
600 | if (offset != 0 || whence != SEEK_CUR) | |
601 | { | |
602 | /* could expand to avoid a second seek. */ | |
603 | scm_end_input (port); | |
604 | result = rv = lseek (fp->fdes, offset, whence); | |
605 | } | |
606 | else | |
607 | { | |
608 | /* read current position without disturbing the buffer | |
609 | (particularly the unread-char buffer). */ | |
610 | rv = lseek (fp->fdes, offset, whence); | |
611 | result = rv - (pt->read_end - pt->read_pos); | |
612 | ||
613 | if (pt->read_buf == pt->putback_buf) | |
614 | result -= pt->saved_read_end - pt->saved_read_pos; | |
615 | } | |
616 | } | |
617 | else /* SCM_PORT_NEITHER */ | |
618 | { | |
619 | result = rv = lseek (fp->fdes, offset, whence); | |
620 | } | |
cb8dfa3f | 621 | |
7dcb364d | 622 | if (rv == -1) |
affc96b5 | 623 | scm_syserror ("fport_seek"); |
7dcb364d | 624 | |
cb8dfa3f | 625 | return result; |
0f2d19dd JB |
626 | } |
627 | ||
840ae05d | 628 | static void |
affc96b5 | 629 | fport_truncate (SCM port, off_t length) |
840ae05d | 630 | { |
92c2555f | 631 | scm_t_fport *fp = SCM_FSTREAM (port); |
840ae05d JB |
632 | |
633 | if (ftruncate (fp->fdes, length) == -1) | |
634 | scm_syserror ("ftruncate"); | |
635 | } | |
636 | ||
0c6d2191 GH |
637 | /* helper for fport_write: try to write data, using multiple system |
638 | calls if required. */ | |
639 | #define FUNC_NAME "write_all" | |
640 | static void write_all (SCM port, const void *data, size_t remaining) | |
641 | { | |
642 | int fdes = SCM_FSTREAM (port)->fdes; | |
643 | ||
644 | while (remaining > 0) | |
645 | { | |
82893676 | 646 | size_t done; |
0c6d2191 GH |
647 | |
648 | SCM_SYSCALL (done = write (fdes, data, remaining)); | |
649 | ||
650 | if (done == -1) | |
651 | SCM_SYSERROR; | |
652 | remaining -= done; | |
653 | data = ((const char *) data) + done; | |
654 | } | |
655 | } | |
656 | #undef FUNC_NAME | |
657 | ||
31703ab8 | 658 | static void |
8aa011a1 | 659 | fport_write (SCM port, const void *data, size_t size) |
31703ab8 | 660 | { |
0c6d2191 | 661 | /* this procedure tries to minimize the number of writes/flushes. */ |
92c2555f | 662 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
31703ab8 | 663 | |
0c6d2191 GH |
664 | if (pt->write_buf == &pt->shortbuf |
665 | || (pt->write_pos == pt->write_buf && size >= pt->write_buf_size)) | |
31703ab8 | 666 | { |
0c6d2191 GH |
667 | /* "unbuffered" port, or |
668 | port with empty buffer and data won't fit in buffer. */ | |
669 | write_all (port, data, size); | |
670 | return; | |
31703ab8 | 671 | } |
d3639214 | 672 | |
0c6d2191 GH |
673 | { |
674 | off_t space = pt->write_end - pt->write_pos; | |
675 | ||
676 | if (size <= space) | |
677 | { | |
678 | /* data fits in buffer. */ | |
679 | memcpy (pt->write_pos, data, size); | |
680 | pt->write_pos += size; | |
681 | if (pt->write_pos == pt->write_end) | |
682 | { | |
affc96b5 | 683 | fport_flush (port); |
0c6d2191 GH |
684 | /* we can skip the line-buffering check if nothing's buffered. */ |
685 | return; | |
686 | } | |
687 | } | |
688 | else | |
689 | { | |
690 | memcpy (pt->write_pos, data, space); | |
691 | pt->write_pos = pt->write_end; | |
692 | fport_flush (port); | |
693 | { | |
694 | const void *ptr = ((const char *) data) + space; | |
695 | size_t remaining = size - space; | |
696 | ||
697 | if (size >= pt->write_buf_size) | |
698 | { | |
699 | write_all (port, ptr, remaining); | |
700 | return; | |
701 | } | |
702 | else | |
703 | { | |
704 | memcpy (pt->write_pos, ptr, remaining); | |
705 | pt->write_pos += remaining; | |
706 | } | |
31703ab8 | 707 | } |
0c6d2191 | 708 | } |
31703ab8 | 709 | |
0c6d2191 GH |
710 | /* handle line buffering. */ |
711 | if ((SCM_CELL_WORD_0 (port) & SCM_BUFLINE) && memchr (data, '\n', size)) | |
712 | fport_flush (port); | |
713 | } | |
31703ab8 GH |
714 | } |
715 | ||
716 | /* becomes 1 when process is exiting: normal exception handling won't | |
717 | work by this time. */ | |
04a98cff | 718 | extern int scm_i_terminating; |
0f2d19dd | 719 | |
cb63cf9e | 720 | static void |
affc96b5 | 721 | fport_flush (SCM port) |
0f2d19dd | 722 | { |
92c2555f MV |
723 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
724 | scm_t_fport *fp = SCM_FSTREAM (port); | |
6f760c1d | 725 | unsigned char *ptr = pt->write_buf; |
c014a02e ML |
726 | long init_size = pt->write_pos - pt->write_buf; |
727 | long remaining = init_size; | |
0f2d19dd | 728 | |
cb63cf9e JB |
729 | while (remaining > 0) |
730 | { | |
c014a02e | 731 | long count; |
cb63cf9e JB |
732 | |
733 | SCM_SYSCALL (count = write (fp->fdes, ptr, remaining)); | |
734 | if (count < 0) | |
735 | { | |
736 | /* error. assume nothing was written this call, but | |
737 | fix up the buffer for any previous successful writes. */ | |
c014a02e | 738 | long done = init_size - remaining; |
cb63cf9e JB |
739 | |
740 | if (done > 0) | |
741 | { | |
742 | int i; | |
743 | ||
744 | for (i = 0; i < remaining; i++) | |
745 | { | |
746 | *(pt->write_buf + i) = *(pt->write_buf + done + i); | |
747 | } | |
748 | pt->write_pos = pt->write_buf + remaining; | |
749 | } | |
04a98cff | 750 | if (scm_i_terminating) |
cb63cf9e JB |
751 | { |
752 | const char *msg = "Error: could not flush file-descriptor "; | |
753 | char buf[11]; | |
754 | ||
755 | write (2, msg, strlen (msg)); | |
756 | sprintf (buf, "%d\n", fp->fdes); | |
757 | write (2, buf, strlen (buf)); | |
758 | ||
759 | count = remaining; | |
760 | } | |
6b72ac1d GH |
761 | else if (scm_gc_running_p) |
762 | { | |
763 | /* silently ignore the error. scm_error would abort if we | |
764 | called it now. */ | |
765 | count = remaining; | |
766 | } | |
767 | else | |
768 | scm_syserror ("fport_flush"); | |
cb63cf9e JB |
769 | } |
770 | ptr += count; | |
771 | remaining -= count; | |
772 | } | |
773 | pt->write_pos = pt->write_buf; | |
61e452ba | 774 | pt->rw_active = SCM_PORT_NEITHER; |
840ae05d JB |
775 | } |
776 | ||
283a1a0e | 777 | /* clear the read buffer and adjust the file position for unread bytes. */ |
840ae05d | 778 | static void |
affc96b5 | 779 | fport_end_input (SCM port, int offset) |
840ae05d | 780 | { |
92c2555f MV |
781 | scm_t_fport *fp = SCM_FSTREAM (port); |
782 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
283a1a0e GH |
783 | |
784 | offset += pt->read_end - pt->read_pos; | |
840ae05d | 785 | |
840ae05d JB |
786 | if (offset > 0) |
787 | { | |
788 | pt->read_pos = pt->read_end; | |
789 | /* will throw error if unread-char used at beginning of file | |
790 | then attempting to write. seems correct. */ | |
791 | if (lseek (fp->fdes, -offset, SEEK_CUR) == -1) | |
affc96b5 | 792 | scm_syserror ("fport_end_input"); |
840ae05d | 793 | } |
61e452ba | 794 | pt->rw_active = SCM_PORT_NEITHER; |
8f29fbd0 JB |
795 | } |
796 | ||
6a2c4c81 | 797 | static int |
affc96b5 | 798 | fport_close (SCM port) |
6a2c4c81 | 799 | { |
92c2555f MV |
800 | scm_t_fport *fp = SCM_FSTREAM (port); |
801 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
cb63cf9e | 802 | int rv; |
840ae05d | 803 | |
affc96b5 | 804 | fport_flush (port); |
cb63cf9e JB |
805 | SCM_SYSCALL (rv = close (fp->fdes)); |
806 | if (rv == -1 && errno != EBADF) | |
6b72ac1d GH |
807 | { |
808 | if (scm_gc_running_p) | |
809 | /* silently ignore the error. scm_error would abort if we | |
810 | called it now. */ | |
811 | ; | |
812 | else | |
813 | scm_syserror ("fport_close"); | |
814 | } | |
6c951427 GH |
815 | if (pt->read_buf == pt->putback_buf) |
816 | pt->read_buf = pt->saved_read_buf; | |
cb63cf9e | 817 | if (pt->read_buf != &pt->shortbuf) |
4c9419ac | 818 | scm_gc_free (pt->read_buf, pt->read_buf_size, "port buffer"); |
cb63cf9e | 819 | if (pt->write_buf != &pt->shortbuf) |
4c9419ac MV |
820 | scm_gc_free (pt->write_buf, pt->write_buf_size, "port buffer"); |
821 | scm_gc_free (fp, sizeof (*fp), "file port"); | |
cb63cf9e | 822 | return rv; |
6a2c4c81 JB |
823 | } |
824 | ||
1be6b49c | 825 | static size_t |
affc96b5 | 826 | fport_free (SCM port) |
b3ec3c64 | 827 | { |
affc96b5 | 828 | fport_close (port); |
b3ec3c64 MD |
829 | return 0; |
830 | } | |
831 | ||
92c2555f | 832 | static scm_t_bits |
b3ec3c64 MD |
833 | scm_make_fptob () |
834 | { | |
92c2555f | 835 | scm_t_bits tc = scm_make_port_type ("file", fport_fill_input, fport_write); |
a98bddfd | 836 | |
affc96b5 | 837 | scm_set_port_free (tc, fport_free); |
e841c3e0 | 838 | scm_set_port_print (tc, fport_print); |
affc96b5 GH |
839 | scm_set_port_flush (tc, fport_flush); |
840 | scm_set_port_end_input (tc, fport_end_input); | |
841 | scm_set_port_close (tc, fport_close); | |
842 | scm_set_port_seek (tc, fport_seek); | |
843 | scm_set_port_truncate (tc, fport_truncate); | |
844 | scm_set_port_input_waiting (tc, fport_input_waiting); | |
a98bddfd DH |
845 | |
846 | return tc; | |
b3ec3c64 | 847 | } |
0f2d19dd | 848 | |
0f2d19dd JB |
849 | void |
850 | scm_init_fports () | |
0f2d19dd | 851 | { |
a98bddfd DH |
852 | scm_tc16_fport = scm_make_fptob (); |
853 | ||
e11e83f3 MV |
854 | scm_c_define ("_IOFBF", scm_from_int (_IOFBF)); |
855 | scm_c_define ("_IOLBF", scm_from_int (_IOLBF)); | |
856 | scm_c_define ("_IONBF", scm_from_int (_IONBF)); | |
a98bddfd | 857 | |
a98bddfd | 858 | #include "libguile/fports.x" |
0f2d19dd | 859 | } |
89e00824 ML |
860 | |
861 | /* | |
862 | Local Variables: | |
863 | c-file-style: "gnu" | |
864 | End: | |
865 | */ |