Commit | Line | Data |
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2b829bbb | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002, 2003, 2004, 2006 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 | |
92205699 | 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
73be1d9e | 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" |
eb372585 | 30 | #include "libguile/posix.h" |
7f9994d9 | 31 | #include "libguile/dynwind.h" |
6b72ac1d | 32 | |
a0599745 | 33 | #include "libguile/fports.h" |
95b88819 GH |
34 | |
35 | #ifdef HAVE_STRING_H | |
36 | #include <string.h> | |
37 | #endif | |
0f2d19dd JB |
38 | #ifdef HAVE_UNISTD_H |
39 | #include <unistd.h> | |
40 | #else | |
1be6b49c | 41 | size_t fwrite (); |
0f2d19dd | 42 | #endif |
b8b17bfd MV |
43 | #ifdef HAVE_IO_H |
44 | #include <io.h> | |
45 | #endif | |
f47a5239 | 46 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
cb63cf9e JB |
47 | #include <sys/stat.h> |
48 | #endif | |
0f2d19dd | 49 | |
cb63cf9e | 50 | #include <errno.h> |
e145dd02 | 51 | |
a0599745 | 52 | #include "libguile/iselect.h" |
edb810bb SJ |
53 | |
54 | /* Some defines for Windows (native port, not Cygwin). */ | |
82893676 MG |
55 | #ifdef __MINGW32__ |
56 | # include <sys/stat.h> | |
57 | # include <winsock2.h> | |
58 | # define ftruncate(fd, size) chsize (fd, size) | |
59 | #endif /* __MINGW32__ */ | |
cb63cf9e | 60 | |
a98bddfd | 61 | |
92c2555f | 62 | scm_t_bits scm_tc16_fport; |
a98bddfd DH |
63 | |
64 | ||
19b27fa2 | 65 | /* default buffer size, used if the O/S won't supply a value. */ |
1be6b49c | 66 | static const size_t default_buffer_size = 1024; |
19b27fa2 | 67 | |
cb63cf9e JB |
68 | /* create FPORT buffer with specified sizes (or -1 to use default size or |
69 | 0 for no buffer. */ | |
70 | static void | |
c014a02e | 71 | scm_fport_buffer_add (SCM port, long read_size, int write_size) |
c6c79933 | 72 | #define FUNC_NAME "scm_fport_buffer_add" |
e145dd02 | 73 | { |
92c2555f | 74 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
e145dd02 | 75 | |
cb63cf9e JB |
76 | if (read_size == -1 || write_size == -1) |
77 | { | |
1be6b49c | 78 | size_t default_size; |
f47a5239 | 79 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
cb63cf9e | 80 | struct stat st; |
b8b17bfd | 81 | scm_t_fport *fp = SCM_FSTREAM (port); |
cb63cf9e | 82 | |
19b27fa2 GH |
83 | default_size = (fstat (fp->fdes, &st) == -1) ? default_buffer_size |
84 | : st.st_blksize; | |
cb63cf9e | 85 | #else |
19b27fa2 | 86 | default_size = default_buffer_size; |
cb63cf9e JB |
87 | #endif |
88 | if (read_size == -1) | |
89 | read_size = default_size; | |
90 | if (write_size == -1) | |
91 | write_size = default_size; | |
92 | } | |
0f2d19dd | 93 | |
f5f2dcff | 94 | if (SCM_INPUT_PORT_P (port) && read_size > 0) |
cb63cf9e | 95 | { |
4c9419ac | 96 | pt->read_buf = scm_gc_malloc (read_size, "port buffer"); |
cb63cf9e JB |
97 | pt->read_pos = pt->read_end = pt->read_buf; |
98 | pt->read_buf_size = read_size; | |
99 | } | |
100 | else | |
101 | { | |
840ae05d | 102 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; |
cb63cf9e JB |
103 | pt->read_buf_size = 1; |
104 | } | |
1717856b | 105 | |
f5f2dcff | 106 | if (SCM_OUTPUT_PORT_P (port) && write_size > 0) |
cb63cf9e | 107 | { |
4c9419ac | 108 | pt->write_buf = scm_gc_malloc (write_size, "port buffer"); |
cb63cf9e JB |
109 | pt->write_pos = pt->write_buf; |
110 | pt->write_buf_size = write_size; | |
111 | } | |
112 | else | |
113 | { | |
114 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
115 | pt->write_buf_size = 1; | |
116 | } | |
117 | ||
118 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
119 | if (read_size > 0 || write_size > 0) | |
54778cd3 | 120 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0); |
cb63cf9e | 121 | else |
54778cd3 | 122 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUF0); |
7a6f1ffa | 123 | } |
c6c79933 | 124 | #undef FUNC_NAME |
7a6f1ffa | 125 | |
a1ec6916 | 126 | SCM_DEFINE (scm_setvbuf, "setvbuf", 2, 1, 0, |
1bbd0b84 | 127 | (SCM port, SCM mode, SCM size), |
fc0d72d4 MD |
128 | "Set the buffering mode for @var{port}. @var{mode} can be:\n" |
129 | "@table @code\n" | |
130 | "@item _IONBF\n" | |
131 | "non-buffered\n" | |
132 | "@item _IOLBF\n" | |
133 | "line buffered\n" | |
134 | "@item _IOFBF\n" | |
135 | "block buffered, using a newly allocated buffer of @var{size} bytes.\n" | |
136 | "If @var{size} is omitted, a default size will be used.\n" | |
2c1ae20e | 137 | "@end table") |
1bbd0b84 | 138 | #define FUNC_NAME s_scm_setvbuf |
7a6f1ffa | 139 | { |
1be6b49c | 140 | int cmode; |
c014a02e | 141 | long csize; |
92c2555f | 142 | scm_t_port *pt; |
7a6f1ffa | 143 | |
78446828 MV |
144 | port = SCM_COERCE_OUTPORT (port); |
145 | ||
3b3b36dd | 146 | SCM_VALIDATE_OPFPORT (1,port); |
a55c2b68 | 147 | cmode = scm_to_int (mode); |
d3639214 | 148 | if (cmode != _IONBF && cmode != _IOFBF && cmode != _IOLBF) |
1bbd0b84 | 149 | scm_out_of_range (FUNC_NAME, mode); |
d3639214 GH |
150 | |
151 | if (cmode == _IOLBF) | |
152 | { | |
54778cd3 | 153 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUFLINE); |
d3639214 GH |
154 | cmode = _IOFBF; |
155 | } | |
156 | else | |
157 | { | |
2b829bbb | 158 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~(scm_t_bits)SCM_BUFLINE); |
d3639214 GH |
159 | } |
160 | ||
7a6f1ffa | 161 | if (SCM_UNBNDP (size)) |
cb63cf9e JB |
162 | { |
163 | if (cmode == _IOFBF) | |
164 | csize = -1; | |
165 | else | |
166 | csize = 0; | |
167 | } | |
7a6f1ffa GH |
168 | else |
169 | { | |
a55c2b68 | 170 | csize = scm_to_int (size); |
cb63cf9e | 171 | if (csize < 0 || (cmode == _IONBF && csize > 0)) |
1bbd0b84 | 172 | scm_out_of_range (FUNC_NAME, size); |
7a6f1ffa | 173 | } |
d3639214 | 174 | |
cb63cf9e | 175 | pt = SCM_PTAB_ENTRY (port); |
7a6f1ffa | 176 | |
4c9419ac MV |
177 | /* silently discards buffered and put-back chars. */ |
178 | if (pt->read_buf == pt->putback_buf) | |
179 | { | |
180 | pt->read_buf = pt->saved_read_buf; | |
181 | pt->read_pos = pt->saved_read_pos; | |
182 | pt->read_end = pt->saved_read_end; | |
183 | pt->read_buf_size = pt->saved_read_buf_size; | |
184 | } | |
cb63cf9e | 185 | if (pt->read_buf != &pt->shortbuf) |
4c9419ac | 186 | scm_gc_free (pt->read_buf, pt->read_buf_size, "port buffer"); |
cb63cf9e | 187 | if (pt->write_buf != &pt->shortbuf) |
4c9419ac | 188 | scm_gc_free (pt->write_buf, pt->write_buf_size, "port buffer"); |
7a6f1ffa | 189 | |
cb63cf9e JB |
190 | scm_fport_buffer_add (port, csize, csize); |
191 | return SCM_UNSPECIFIED; | |
0f2d19dd | 192 | } |
1bbd0b84 | 193 | #undef FUNC_NAME |
0f2d19dd | 194 | |
eadd48de | 195 | /* Move ports with the specified file descriptor to new descriptors, |
387d418c | 196 | * resetting the revealed count to 0. |
0f2d19dd | 197 | */ |
1717856b | 198 | |
eadd48de | 199 | void |
6e8d25a6 | 200 | scm_evict_ports (int fd) |
0f2d19dd | 201 | { |
c014a02e | 202 | long i; |
0f2d19dd | 203 | |
9de87eea | 204 | scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex); |
b9ad392e | 205 | |
67329a9e | 206 | for (i = 0; i < scm_i_port_table_size; i++) |
eadd48de | 207 | { |
67329a9e | 208 | SCM port = scm_i_port_table[i]->port; |
cb63cf9e JB |
209 | |
210 | if (SCM_FPORTP (port)) | |
eadd48de | 211 | { |
92c2555f | 212 | scm_t_fport *fp = SCM_FSTREAM (port); |
cb63cf9e JB |
213 | |
214 | if (fp->fdes == fd) | |
215 | { | |
216 | fp->fdes = dup (fd); | |
217 | if (fp->fdes == -1) | |
218 | scm_syserror ("scm_evict_ports"); | |
e11e83f3 | 219 | scm_set_port_revealed_x (port, scm_from_int (0)); |
cb63cf9e | 220 | } |
eadd48de GH |
221 | } |
222 | } | |
b9ad392e | 223 | |
9de87eea | 224 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
eadd48de | 225 | } |
0f2d19dd | 226 | |
efa40607 DH |
227 | |
228 | SCM_DEFINE (scm_file_port_p, "file-port?", 1, 0, 0, | |
229 | (SCM obj), | |
2069af38 | 230 | "Determine whether @var{obj} is a port that is related to a file.") |
efa40607 DH |
231 | #define FUNC_NAME s_scm_file_port_p |
232 | { | |
7888309b | 233 | return scm_from_bool (SCM_FPORTP (obj)); |
efa40607 DH |
234 | } |
235 | #undef FUNC_NAME | |
236 | ||
237 | ||
0f2d19dd JB |
238 | /* scm_open_file |
239 | * Return a new port open on a given file. | |
240 | * | |
241 | * The mode string must match the pattern: [rwa+]** which | |
242 | * is interpreted in the usual unix way. | |
243 | * | |
244 | * Return the new port. | |
245 | */ | |
3b3b36dd | 246 | SCM_DEFINE (scm_open_file, "open-file", 2, 0, 0, |
1e6808ea MG |
247 | (SCM filename, SCM mode), |
248 | "Open the file whose name is @var{filename}, and return a port\n" | |
fc0d72d4 | 249 | "representing that file. The attributes of the port are\n" |
1e6808ea MG |
250 | "determined by the @var{mode} string. The way in which this is\n" |
251 | "interpreted is similar to C stdio. The first character must be\n" | |
252 | "one of the following:\n" | |
fc0d72d4 MD |
253 | "@table @samp\n" |
254 | "@item r\n" | |
255 | "Open an existing file for input.\n" | |
256 | "@item w\n" | |
257 | "Open a file for output, creating it if it doesn't already exist\n" | |
258 | "or removing its contents if it does.\n" | |
259 | "@item a\n" | |
1e6808ea MG |
260 | "Open a file for output, creating it if it doesn't already\n" |
261 | "exist. All writes to the port will go to the end of the file.\n" | |
fc0d72d4 MD |
262 | "The \"append mode\" can be turned off while the port is in use\n" |
263 | "@pxref{Ports and File Descriptors, fcntl}\n" | |
1e6808ea MG |
264 | "@end table\n" |
265 | "The following additional characters can be appended:\n" | |
fc0d72d4 | 266 | "@table @samp\n" |
fc9c5d06 HWN |
267 | "@item b\n" |
268 | "Open the underlying file in binary mode, if supported by the operating system. " | |
fc0d72d4 MD |
269 | "@item +\n" |
270 | "Open the port for both input and output. E.g., @code{r+}: open\n" | |
271 | "an existing file for both input and output.\n" | |
272 | "@item 0\n" | |
1e6808ea MG |
273 | "Create an \"unbuffered\" port. In this case input and output\n" |
274 | "operations are passed directly to the underlying port\n" | |
275 | "implementation without additional buffering. This is likely to\n" | |
276 | "slow down I/O operations. The buffering mode can be changed\n" | |
277 | "while a port is in use @pxref{Ports and File Descriptors,\n" | |
278 | "setvbuf}\n" | |
fc0d72d4 MD |
279 | "@item l\n" |
280 | "Add line-buffering to the port. The port output buffer will be\n" | |
281 | "automatically flushed whenever a newline character is written.\n" | |
1e6808ea MG |
282 | "@end table\n" |
283 | "In theory we could create read/write ports which were buffered\n" | |
284 | "in one direction only. However this isn't included in the\n" | |
285 | "current interfaces. If a file cannot be opened with the access\n" | |
286 | "requested, @code{open-file} throws an exception.") | |
1bbd0b84 | 287 | #define FUNC_NAME s_scm_open_file |
0f2d19dd | 288 | { |
19639113 | 289 | SCM port; |
cb63cf9e JB |
290 | int fdes; |
291 | int flags = 0; | |
19639113 | 292 | char *file; |
1e6808ea | 293 | char *md; |
cb63cf9e | 294 | char *ptr; |
19639113 | 295 | |
661ae7ab | 296 | scm_dynwind_begin (0); |
19639113 | 297 | |
7f9994d9 | 298 | file = scm_to_locale_string (filename); |
661ae7ab | 299 | scm_dynwind_free (file); |
7f9994d9 MV |
300 | |
301 | md = scm_to_locale_string (mode); | |
661ae7ab | 302 | scm_dynwind_free (md); |
19639113 | 303 | |
1e6808ea | 304 | switch (*md) |
0f2d19dd | 305 | { |
cb63cf9e JB |
306 | case 'r': |
307 | flags |= O_RDONLY; | |
308 | break; | |
309 | case 'w': | |
310 | flags |= O_WRONLY | O_CREAT | O_TRUNC; | |
311 | break; | |
312 | case 'a': | |
313 | flags |= O_WRONLY | O_CREAT | O_APPEND; | |
314 | break; | |
315 | default: | |
1e6808ea | 316 | scm_out_of_range (FUNC_NAME, mode); |
0f2d19dd | 317 | } |
1e6808ea | 318 | ptr = md + 1; |
cb63cf9e | 319 | while (*ptr != '\0') |
e145dd02 | 320 | { |
cb63cf9e JB |
321 | switch (*ptr) |
322 | { | |
323 | case '+': | |
324 | flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR; | |
325 | break; | |
9f561420 GH |
326 | case 'b': |
327 | #if defined (O_BINARY) | |
328 | flags |= O_BINARY; | |
329 | #endif | |
330 | break; | |
cb63cf9e | 331 | case '0': /* unbuffered: handled later. */ |
d3639214 | 332 | case 'l': /* line buffered: handled during output. */ |
cb63cf9e JB |
333 | break; |
334 | default: | |
1e6808ea | 335 | scm_out_of_range (FUNC_NAME, mode); |
cb63cf9e JB |
336 | } |
337 | ptr++; | |
e145dd02 | 338 | } |
cb63cf9e JB |
339 | SCM_SYSCALL (fdes = open (file, flags, 0666)); |
340 | if (fdes == -1) | |
e145dd02 | 341 | { |
cb63cf9e JB |
342 | int en = errno; |
343 | ||
5d2d2ffc | 344 | SCM_SYSERROR_MSG ("~A: ~S", |
fd08c236 | 345 | scm_cons (scm_strerror (scm_from_int (en)), |
5d2d2ffc | 346 | scm_cons (filename, SCM_EOL)), en); |
0f2d19dd | 347 | } |
d617ee18 | 348 | port = scm_i_fdes_to_port (fdes, scm_i_mode_bits (mode), filename); |
7f9994d9 | 349 | |
661ae7ab | 350 | scm_dynwind_end (); |
7f9994d9 | 351 | |
0f2d19dd JB |
352 | return port; |
353 | } | |
1bbd0b84 | 354 | #undef FUNC_NAME |
0f2d19dd | 355 | |
e145dd02 | 356 | \f |
82893676 MG |
357 | #ifdef __MINGW32__ |
358 | /* | |
359 | * Try getting the appropiate file flags for a given file descriptor | |
360 | * under Windows. This incorporates some fancy operations because Windows | |
361 | * differentiates between file, pipe and socket descriptors. | |
362 | */ | |
363 | #ifndef O_ACCMODE | |
364 | # define O_ACCMODE 0x0003 | |
365 | #endif | |
366 | ||
367 | static int getflags (int fdes) | |
368 | { | |
369 | int flags = 0; | |
370 | struct stat buf; | |
371 | int error, optlen = sizeof (int); | |
372 | ||
373 | /* Is this a socket ? */ | |
374 | if (getsockopt (fdes, SOL_SOCKET, SO_ERROR, (void *) &error, &optlen) >= 0) | |
375 | flags = O_RDWR; | |
376 | /* Maybe a regular file ? */ | |
377 | else if (fstat (fdes, &buf) < 0) | |
378 | flags = -1; | |
379 | else | |
380 | { | |
381 | /* Or an anonymous pipe handle ? */ | |
b8b17bfd | 382 | if (buf.st_mode & _S_IFIFO) |
8f99e3f3 SJ |
383 | flags = PeekNamedPipe ((HANDLE) _get_osfhandle (fdes), NULL, 0, |
384 | NULL, NULL, NULL) ? O_RDONLY : O_WRONLY; | |
82893676 | 385 | /* stdin ? */ |
b8b17bfd | 386 | else if (fdes == fileno (stdin) && isatty (fdes)) |
82893676 MG |
387 | flags = O_RDONLY; |
388 | /* stdout / stderr ? */ | |
b8b17bfd MV |
389 | else if ((fdes == fileno (stdout) || fdes == fileno (stderr)) && |
390 | isatty (fdes)) | |
82893676 MG |
391 | flags = O_WRONLY; |
392 | else | |
393 | flags = buf.st_mode; | |
394 | } | |
395 | return flags; | |
396 | } | |
397 | #endif /* __MINGW32__ */ | |
398 | ||
cb63cf9e | 399 | /* Building Guile ports from a file descriptor. */ |
e145dd02 | 400 | |
cb63cf9e | 401 | /* Build a Scheme port from an open file descriptor `fdes'. |
a089567e JB |
402 | MODE indicates whether FILE is open for reading or writing; it uses |
403 | the same notation as open-file's second argument. | |
19b27fa2 GH |
404 | NAME is a string to be used as the port's filename. |
405 | */ | |
a089567e | 406 | SCM |
d617ee18 | 407 | scm_i_fdes_to_port (int fdes, long mode_bits, SCM name) |
19b27fa2 | 408 | #define FUNC_NAME "scm_fdes_to_port" |
a089567e | 409 | { |
a089567e | 410 | SCM port; |
92c2555f | 411 | scm_t_port *pt; |
19b27fa2 GH |
412 | int flags; |
413 | ||
414 | /* test that fdes is valid. */ | |
82893676 MG |
415 | #ifdef __MINGW32__ |
416 | flags = getflags (fdes); | |
417 | #else | |
19b27fa2 | 418 | flags = fcntl (fdes, F_GETFL, 0); |
82893676 | 419 | #endif |
19b27fa2 GH |
420 | if (flags == -1) |
421 | SCM_SYSERROR; | |
422 | flags &= O_ACCMODE; | |
423 | if (flags != O_RDWR | |
424 | && ((flags != O_WRONLY && (mode_bits & SCM_WRTNG)) | |
425 | || (flags != O_RDONLY && (mode_bits & SCM_RDNG)))) | |
426 | { | |
427 | SCM_MISC_ERROR ("requested file mode not available on fdes", SCM_EOL); | |
428 | } | |
a089567e | 429 | |
9de87eea | 430 | scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex); |
da220f27 HWN |
431 | |
432 | port = scm_new_port_table_entry (scm_tc16_fport); | |
433 | SCM_SET_CELL_TYPE(port, scm_tc16_fport | mode_bits); | |
434 | pt = SCM_PTAB_ENTRY(port); | |
a089567e | 435 | { |
92c2555f | 436 | scm_t_fport *fp |
4c9419ac | 437 | = (scm_t_fport *) scm_gc_malloc (sizeof (scm_t_fport), "file port"); |
c6c79933 | 438 | |
cb63cf9e | 439 | fp->fdes = fdes; |
0de97b83 | 440 | pt->rw_random = SCM_FDES_RANDOM_P (fdes); |
cb63cf9e JB |
441 | SCM_SETSTREAM (port, fp); |
442 | if (mode_bits & SCM_BUF0) | |
443 | scm_fport_buffer_add (port, 0, 0); | |
444 | else | |
445 | scm_fport_buffer_add (port, -1, -1); | |
a089567e | 446 | } |
b24b5e13 | 447 | SCM_SET_FILENAME (port, name); |
9de87eea | 448 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
e145dd02 JB |
449 | return port; |
450 | } | |
19b27fa2 | 451 | #undef FUNC_NAME |
e145dd02 | 452 | |
d617ee18 MV |
453 | SCM |
454 | scm_fdes_to_port (int fdes, char *mode, SCM name) | |
455 | { | |
456 | return scm_i_fdes_to_port (fdes, scm_mode_bits (mode), name); | |
457 | } | |
458 | ||
affc96b5 | 459 | /* Return a lower bound on the number of bytes available for input. */ |
cb63cf9e | 460 | static int |
affc96b5 | 461 | fport_input_waiting (SCM port) |
e145dd02 | 462 | { |
cb63cf9e JB |
463 | int fdes = SCM_FSTREAM (port)->fdes; |
464 | ||
465 | #ifdef HAVE_SELECT | |
466 | struct timeval timeout; | |
467 | SELECT_TYPE read_set; | |
468 | SELECT_TYPE write_set; | |
469 | SELECT_TYPE except_set; | |
470 | ||
471 | FD_ZERO (&read_set); | |
472 | FD_ZERO (&write_set); | |
473 | FD_ZERO (&except_set); | |
474 | ||
475 | FD_SET (fdes, &read_set); | |
476 | ||
477 | timeout.tv_sec = 0; | |
478 | timeout.tv_usec = 0; | |
479 | ||
480 | if (select (SELECT_SET_SIZE, | |
481 | &read_set, &write_set, &except_set, &timeout) | |
482 | < 0) | |
affc96b5 GH |
483 | scm_syserror ("fport_input_waiting"); |
484 | return FD_ISSET (fdes, &read_set) ? 1 : 0; | |
cb63cf9e JB |
485 | #elif defined (FIONREAD) |
486 | int remir; | |
487 | ioctl(fdes, FIONREAD, &remir); | |
488 | return remir; | |
489 | #else | |
affc96b5 | 490 | scm_misc_error ("fport_input_waiting", |
cb63cf9e JB |
491 | "Not fully implemented on this platform", |
492 | SCM_EOL); | |
493 | #endif | |
a089567e JB |
494 | } |
495 | ||
cb63cf9e | 496 | \f |
0f2d19dd | 497 | static int |
e81d98ec | 498 | fport_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) |
0f2d19dd | 499 | { |
b3ec3c64 MD |
500 | scm_puts ("#<", port); |
501 | scm_print_port_mode (exp, port); | |
502 | if (SCM_OPFPORTP (exp)) | |
0f2d19dd | 503 | { |
b3ec3c64 | 504 | int fdes; |
b24b5e13 | 505 | SCM name = SCM_FILENAME (exp); |
cc95e00a | 506 | if (scm_is_string (name) || scm_is_symbol (name)) |
b24b5e13 DH |
507 | scm_display (name, port); |
508 | else | |
509 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); | |
b3ec3c64 MD |
510 | scm_putc (' ', port); |
511 | fdes = (SCM_FSTREAM (exp))->fdes; | |
512 | ||
82893676 | 513 | #ifdef HAVE_TTYNAME |
b3ec3c64 | 514 | if (isatty (fdes)) |
eb372585 | 515 | scm_display (scm_ttyname (exp), port); |
b3ec3c64 | 516 | else |
82893676 | 517 | #endif /* HAVE_TTYNAME */ |
b3ec3c64 | 518 | scm_intprint (fdes, 10, port); |
0f2d19dd JB |
519 | } |
520 | else | |
521 | { | |
b3ec3c64 MD |
522 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); |
523 | scm_putc (' ', port); | |
0345e278 | 524 | scm_uintprint ((scm_t_bits) SCM_PTAB_ENTRY (exp), 16, port); |
0f2d19dd | 525 | } |
b3ec3c64 MD |
526 | scm_putc ('>', port); |
527 | return 1; | |
0f2d19dd JB |
528 | } |
529 | ||
2e945bcc | 530 | #ifndef __MINGW32__ |
cb63cf9e JB |
531 | /* thread-local block for input on fport's fdes. */ |
532 | static void | |
533 | fport_wait_for_input (SCM port) | |
3cb988bd | 534 | { |
cb63cf9e | 535 | int fdes = SCM_FSTREAM (port)->fdes; |
3cb988bd | 536 | |
affc96b5 | 537 | if (!fport_input_waiting (port)) |
8122b543 | 538 | { |
cb63cf9e JB |
539 | int n; |
540 | SELECT_TYPE readfds; | |
541 | int flags = fcntl (fdes, F_GETFL); | |
542 | ||
543 | if (flags == -1) | |
544 | scm_syserror ("scm_fdes_wait_for_input"); | |
545 | if (!(flags & O_NONBLOCK)) | |
546 | do | |
547 | { | |
548 | FD_ZERO (&readfds); | |
549 | FD_SET (fdes, &readfds); | |
9de87eea | 550 | n = scm_std_select (fdes + 1, &readfds, NULL, NULL, NULL); |
cb63cf9e JB |
551 | } |
552 | while (n == -1 && errno == EINTR); | |
8122b543 | 553 | } |
3cb988bd | 554 | } |
2e945bcc | 555 | #endif /* !__MINGW32__ */ |
0f2d19dd | 556 | |
affc96b5 | 557 | static void fport_flush (SCM port); |
0f2d19dd | 558 | |
c2da2648 GH |
559 | /* fill a port's read-buffer with a single read. returns the first |
560 | char or EOF if end of file. */ | |
0f2d19dd | 561 | static int |
affc96b5 | 562 | fport_fill_input (SCM port) |
0f2d19dd | 563 | { |
c014a02e | 564 | long count; |
92c2555f MV |
565 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
566 | scm_t_fport *fp = SCM_FSTREAM (port); | |
cb63cf9e | 567 | |
2e945bcc | 568 | #ifndef __MINGW32__ |
cb63cf9e | 569 | fport_wait_for_input (port); |
2e945bcc | 570 | #endif /* !__MINGW32__ */ |
cb63cf9e JB |
571 | SCM_SYSCALL (count = read (fp->fdes, pt->read_buf, pt->read_buf_size)); |
572 | if (count == -1) | |
affc96b5 | 573 | scm_syserror ("fport_fill_input"); |
cb63cf9e JB |
574 | if (count == 0) |
575 | return EOF; | |
576 | else | |
577 | { | |
5c070ca7 | 578 | pt->read_pos = pt->read_buf; |
cb63cf9e | 579 | pt->read_end = pt->read_buf + count; |
5c070ca7 | 580 | return *pt->read_buf; |
cb63cf9e | 581 | } |
0f2d19dd JB |
582 | } |
583 | ||
cb63cf9e | 584 | static off_t |
affc96b5 | 585 | fport_seek (SCM port, off_t offset, int whence) |
0f2d19dd | 586 | { |
92c2555f MV |
587 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
588 | scm_t_fport *fp = SCM_FSTREAM (port); | |
7dcb364d GH |
589 | off_t rv; |
590 | off_t result; | |
591 | ||
592 | if (pt->rw_active == SCM_PORT_WRITE) | |
593 | { | |
594 | if (offset != 0 || whence != SEEK_CUR) | |
595 | { | |
596 | fport_flush (port); | |
597 | result = rv = lseek (fp->fdes, offset, whence); | |
598 | } | |
599 | else | |
600 | { | |
601 | /* read current position without disturbing the buffer. */ | |
602 | rv = lseek (fp->fdes, offset, whence); | |
603 | result = rv + (pt->write_pos - pt->write_buf); | |
604 | } | |
605 | } | |
606 | else if (pt->rw_active == SCM_PORT_READ) | |
607 | { | |
608 | if (offset != 0 || whence != SEEK_CUR) | |
609 | { | |
610 | /* could expand to avoid a second seek. */ | |
611 | scm_end_input (port); | |
612 | result = rv = lseek (fp->fdes, offset, whence); | |
613 | } | |
614 | else | |
615 | { | |
616 | /* read current position without disturbing the buffer | |
617 | (particularly the unread-char buffer). */ | |
618 | rv = lseek (fp->fdes, offset, whence); | |
619 | result = rv - (pt->read_end - pt->read_pos); | |
620 | ||
621 | if (pt->read_buf == pt->putback_buf) | |
622 | result -= pt->saved_read_end - pt->saved_read_pos; | |
623 | } | |
624 | } | |
625 | else /* SCM_PORT_NEITHER */ | |
626 | { | |
627 | result = rv = lseek (fp->fdes, offset, whence); | |
628 | } | |
cb8dfa3f | 629 | |
7dcb364d | 630 | if (rv == -1) |
affc96b5 | 631 | scm_syserror ("fport_seek"); |
7dcb364d | 632 | |
cb8dfa3f | 633 | return result; |
0f2d19dd JB |
634 | } |
635 | ||
840ae05d | 636 | static void |
affc96b5 | 637 | fport_truncate (SCM port, off_t length) |
840ae05d | 638 | { |
92c2555f | 639 | scm_t_fport *fp = SCM_FSTREAM (port); |
840ae05d JB |
640 | |
641 | if (ftruncate (fp->fdes, length) == -1) | |
642 | scm_syserror ("ftruncate"); | |
643 | } | |
644 | ||
0c6d2191 GH |
645 | /* helper for fport_write: try to write data, using multiple system |
646 | calls if required. */ | |
647 | #define FUNC_NAME "write_all" | |
648 | static void write_all (SCM port, const void *data, size_t remaining) | |
649 | { | |
650 | int fdes = SCM_FSTREAM (port)->fdes; | |
651 | ||
652 | while (remaining > 0) | |
653 | { | |
82893676 | 654 | size_t done; |
0c6d2191 GH |
655 | |
656 | SCM_SYSCALL (done = write (fdes, data, remaining)); | |
657 | ||
658 | if (done == -1) | |
659 | SCM_SYSERROR; | |
660 | remaining -= done; | |
661 | data = ((const char *) data) + done; | |
662 | } | |
663 | } | |
664 | #undef FUNC_NAME | |
665 | ||
31703ab8 | 666 | static void |
8aa011a1 | 667 | fport_write (SCM port, const void *data, size_t size) |
31703ab8 | 668 | { |
0c6d2191 | 669 | /* this procedure tries to minimize the number of writes/flushes. */ |
92c2555f | 670 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
31703ab8 | 671 | |
0c6d2191 GH |
672 | if (pt->write_buf == &pt->shortbuf |
673 | || (pt->write_pos == pt->write_buf && size >= pt->write_buf_size)) | |
31703ab8 | 674 | { |
0c6d2191 GH |
675 | /* "unbuffered" port, or |
676 | port with empty buffer and data won't fit in buffer. */ | |
677 | write_all (port, data, size); | |
678 | return; | |
31703ab8 | 679 | } |
d3639214 | 680 | |
0c6d2191 GH |
681 | { |
682 | off_t space = pt->write_end - pt->write_pos; | |
683 | ||
684 | if (size <= space) | |
685 | { | |
686 | /* data fits in buffer. */ | |
687 | memcpy (pt->write_pos, data, size); | |
688 | pt->write_pos += size; | |
689 | if (pt->write_pos == pt->write_end) | |
690 | { | |
affc96b5 | 691 | fport_flush (port); |
0c6d2191 GH |
692 | /* we can skip the line-buffering check if nothing's buffered. */ |
693 | return; | |
694 | } | |
695 | } | |
696 | else | |
697 | { | |
698 | memcpy (pt->write_pos, data, space); | |
699 | pt->write_pos = pt->write_end; | |
700 | fport_flush (port); | |
701 | { | |
702 | const void *ptr = ((const char *) data) + space; | |
703 | size_t remaining = size - space; | |
704 | ||
705 | if (size >= pt->write_buf_size) | |
706 | { | |
707 | write_all (port, ptr, remaining); | |
708 | return; | |
709 | } | |
710 | else | |
711 | { | |
712 | memcpy (pt->write_pos, ptr, remaining); | |
713 | pt->write_pos += remaining; | |
714 | } | |
31703ab8 | 715 | } |
0c6d2191 | 716 | } |
31703ab8 | 717 | |
0c6d2191 GH |
718 | /* handle line buffering. */ |
719 | if ((SCM_CELL_WORD_0 (port) & SCM_BUFLINE) && memchr (data, '\n', size)) | |
720 | fport_flush (port); | |
721 | } | |
31703ab8 GH |
722 | } |
723 | ||
724 | /* becomes 1 when process is exiting: normal exception handling won't | |
725 | work by this time. */ | |
04a98cff | 726 | extern int scm_i_terminating; |
0f2d19dd | 727 | |
cb63cf9e | 728 | static void |
affc96b5 | 729 | fport_flush (SCM port) |
0f2d19dd | 730 | { |
92c2555f MV |
731 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
732 | scm_t_fport *fp = SCM_FSTREAM (port); | |
6f760c1d | 733 | unsigned char *ptr = pt->write_buf; |
c014a02e ML |
734 | long init_size = pt->write_pos - pt->write_buf; |
735 | long remaining = init_size; | |
0f2d19dd | 736 | |
cb63cf9e JB |
737 | while (remaining > 0) |
738 | { | |
c014a02e | 739 | long count; |
cb63cf9e JB |
740 | |
741 | SCM_SYSCALL (count = write (fp->fdes, ptr, remaining)); | |
742 | if (count < 0) | |
743 | { | |
744 | /* error. assume nothing was written this call, but | |
745 | fix up the buffer for any previous successful writes. */ | |
c014a02e | 746 | long done = init_size - remaining; |
cb63cf9e JB |
747 | |
748 | if (done > 0) | |
749 | { | |
750 | int i; | |
751 | ||
752 | for (i = 0; i < remaining; i++) | |
753 | { | |
754 | *(pt->write_buf + i) = *(pt->write_buf + done + i); | |
755 | } | |
756 | pt->write_pos = pt->write_buf + remaining; | |
757 | } | |
04a98cff | 758 | if (scm_i_terminating) |
cb63cf9e JB |
759 | { |
760 | const char *msg = "Error: could not flush file-descriptor "; | |
761 | char buf[11]; | |
762 | ||
763 | write (2, msg, strlen (msg)); | |
764 | sprintf (buf, "%d\n", fp->fdes); | |
765 | write (2, buf, strlen (buf)); | |
766 | ||
767 | count = remaining; | |
768 | } | |
6b72ac1d GH |
769 | else if (scm_gc_running_p) |
770 | { | |
771 | /* silently ignore the error. scm_error would abort if we | |
772 | called it now. */ | |
773 | count = remaining; | |
774 | } | |
775 | else | |
776 | scm_syserror ("fport_flush"); | |
cb63cf9e JB |
777 | } |
778 | ptr += count; | |
779 | remaining -= count; | |
780 | } | |
781 | pt->write_pos = pt->write_buf; | |
61e452ba | 782 | pt->rw_active = SCM_PORT_NEITHER; |
840ae05d JB |
783 | } |
784 | ||
283a1a0e | 785 | /* clear the read buffer and adjust the file position for unread bytes. */ |
840ae05d | 786 | static void |
affc96b5 | 787 | fport_end_input (SCM port, int offset) |
840ae05d | 788 | { |
92c2555f MV |
789 | scm_t_fport *fp = SCM_FSTREAM (port); |
790 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
283a1a0e GH |
791 | |
792 | offset += pt->read_end - pt->read_pos; | |
840ae05d | 793 | |
840ae05d JB |
794 | if (offset > 0) |
795 | { | |
796 | pt->read_pos = pt->read_end; | |
797 | /* will throw error if unread-char used at beginning of file | |
798 | then attempting to write. seems correct. */ | |
799 | if (lseek (fp->fdes, -offset, SEEK_CUR) == -1) | |
affc96b5 | 800 | scm_syserror ("fport_end_input"); |
840ae05d | 801 | } |
61e452ba | 802 | pt->rw_active = SCM_PORT_NEITHER; |
8f29fbd0 JB |
803 | } |
804 | ||
6a2c4c81 | 805 | static int |
affc96b5 | 806 | fport_close (SCM port) |
6a2c4c81 | 807 | { |
92c2555f MV |
808 | scm_t_fport *fp = SCM_FSTREAM (port); |
809 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
cb63cf9e | 810 | int rv; |
840ae05d | 811 | |
affc96b5 | 812 | fport_flush (port); |
cb63cf9e JB |
813 | SCM_SYSCALL (rv = close (fp->fdes)); |
814 | if (rv == -1 && errno != EBADF) | |
6b72ac1d GH |
815 | { |
816 | if (scm_gc_running_p) | |
817 | /* silently ignore the error. scm_error would abort if we | |
818 | called it now. */ | |
819 | ; | |
820 | else | |
821 | scm_syserror ("fport_close"); | |
822 | } | |
6c951427 GH |
823 | if (pt->read_buf == pt->putback_buf) |
824 | pt->read_buf = pt->saved_read_buf; | |
cb63cf9e | 825 | if (pt->read_buf != &pt->shortbuf) |
4c9419ac | 826 | scm_gc_free (pt->read_buf, pt->read_buf_size, "port buffer"); |
cb63cf9e | 827 | if (pt->write_buf != &pt->shortbuf) |
4c9419ac MV |
828 | scm_gc_free (pt->write_buf, pt->write_buf_size, "port buffer"); |
829 | scm_gc_free (fp, sizeof (*fp), "file port"); | |
cb63cf9e | 830 | return rv; |
6a2c4c81 JB |
831 | } |
832 | ||
1be6b49c | 833 | static size_t |
affc96b5 | 834 | fport_free (SCM port) |
b3ec3c64 | 835 | { |
affc96b5 | 836 | fport_close (port); |
b3ec3c64 MD |
837 | return 0; |
838 | } | |
839 | ||
92c2555f | 840 | static scm_t_bits |
b3ec3c64 MD |
841 | scm_make_fptob () |
842 | { | |
92c2555f | 843 | scm_t_bits tc = scm_make_port_type ("file", fport_fill_input, fport_write); |
a98bddfd | 844 | |
affc96b5 | 845 | scm_set_port_free (tc, fport_free); |
e841c3e0 | 846 | scm_set_port_print (tc, fport_print); |
affc96b5 GH |
847 | scm_set_port_flush (tc, fport_flush); |
848 | scm_set_port_end_input (tc, fport_end_input); | |
849 | scm_set_port_close (tc, fport_close); | |
850 | scm_set_port_seek (tc, fport_seek); | |
851 | scm_set_port_truncate (tc, fport_truncate); | |
852 | scm_set_port_input_waiting (tc, fport_input_waiting); | |
a98bddfd DH |
853 | |
854 | return tc; | |
b3ec3c64 | 855 | } |
0f2d19dd | 856 | |
0f2d19dd JB |
857 | void |
858 | scm_init_fports () | |
0f2d19dd | 859 | { |
a98bddfd DH |
860 | scm_tc16_fport = scm_make_fptob (); |
861 | ||
e11e83f3 MV |
862 | scm_c_define ("_IOFBF", scm_from_int (_IOFBF)); |
863 | scm_c_define ("_IOLBF", scm_from_int (_IOLBF)); | |
864 | scm_c_define ("_IONBF", scm_from_int (_IONBF)); | |
a98bddfd | 865 | |
a98bddfd | 866 | #include "libguile/fports.x" |
0f2d19dd | 867 | } |
89e00824 ML |
868 | |
869 | /* | |
870 | Local Variables: | |
871 | c-file-style: "gnu" | |
872 | End: | |
873 | */ |