Commit | Line | Data |
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e81d98ec | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc. |
0f2d19dd JB |
2 | * |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License as published by | |
5 | * the Free Software Foundation; either version 2, or (at your option) | |
6 | * any later version. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this software; see the file COPYING. If not, write to | |
82892bed JB |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
16 | * Boston, MA 02111-1307 USA | |
0f2d19dd JB |
17 | * |
18 | * As a special exception, the Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of GUILE. | |
20 | * | |
21 | * The exception is that, if you link the GUILE library with other files | |
22 | * to produce an executable, this does not by itself cause the | |
23 | * resulting executable to be covered by the GNU General Public License. | |
24 | * Your use of that executable is in no way restricted on account of | |
25 | * linking the GUILE library code into it. | |
26 | * | |
27 | * This exception does not however invalidate any other reasons why | |
28 | * the executable file might be covered by the GNU General Public License. | |
29 | * | |
30 | * This exception applies only to the code released by the | |
31 | * Free Software Foundation under the name GUILE. If you copy | |
32 | * code from other Free Software Foundation releases into a copy of | |
33 | * GUILE, as the General Public License permits, the exception does | |
34 | * not apply to the code that you add in this way. To avoid misleading | |
35 | * anyone as to the status of such modified files, you must delete | |
36 | * this exception notice from them. | |
37 | * | |
38 | * If you write modifications of your own for GUILE, it is your choice | |
39 | * whether to permit this exception to apply to your modifications. | |
82892bed | 40 | * If you do not wish that, delete this exception notice. */ |
1bbd0b84 | 41 | |
1bbd0b84 | 42 | |
0f2d19dd JB |
43 | \f |
44 | ||
45 | #include <stdio.h> | |
cb63cf9e | 46 | #include <fcntl.h> |
a0599745 MD |
47 | #include "libguile/_scm.h" |
48 | #include "libguile/strings.h" | |
a0599745 | 49 | #include "libguile/validate.h" |
6b72ac1d GH |
50 | #include "libguile/gc.h" |
51 | ||
a0599745 | 52 | #include "libguile/fports.h" |
95b88819 GH |
53 | |
54 | #ifdef HAVE_STRING_H | |
55 | #include <string.h> | |
56 | #endif | |
0f2d19dd JB |
57 | #ifdef HAVE_UNISTD_H |
58 | #include <unistd.h> | |
59 | #else | |
1be6b49c | 60 | size_t fwrite (); |
0f2d19dd | 61 | #endif |
b8b17bfd MV |
62 | #ifdef HAVE_IO_H |
63 | #include <io.h> | |
64 | #endif | |
f47a5239 | 65 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
cb63cf9e JB |
66 | #include <sys/stat.h> |
67 | #endif | |
0f2d19dd | 68 | |
cb63cf9e | 69 | #include <errno.h> |
e145dd02 | 70 | |
a0599745 | 71 | #include "libguile/iselect.h" |
82893676 MG |
72 | /* Some defines for Windows. */ |
73 | #ifdef __MINGW32__ | |
74 | # include <sys/stat.h> | |
75 | # include <winsock2.h> | |
76 | # define ftruncate(fd, size) chsize (fd, size) | |
77 | #endif /* __MINGW32__ */ | |
cb63cf9e | 78 | |
a98bddfd | 79 | |
92c2555f | 80 | scm_t_bits scm_tc16_fport; |
a98bddfd DH |
81 | |
82 | ||
19b27fa2 | 83 | /* default buffer size, used if the O/S won't supply a value. */ |
1be6b49c | 84 | static const size_t default_buffer_size = 1024; |
19b27fa2 | 85 | |
cb63cf9e JB |
86 | /* create FPORT buffer with specified sizes (or -1 to use default size or |
87 | 0 for no buffer. */ | |
88 | static void | |
c014a02e | 89 | scm_fport_buffer_add (SCM port, long read_size, int write_size) |
c6c79933 | 90 | #define FUNC_NAME "scm_fport_buffer_add" |
e145dd02 | 91 | { |
92c2555f | 92 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
e145dd02 | 93 | |
cb63cf9e JB |
94 | if (read_size == -1 || write_size == -1) |
95 | { | |
1be6b49c | 96 | size_t default_size; |
f47a5239 | 97 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
cb63cf9e | 98 | struct stat st; |
b8b17bfd | 99 | scm_t_fport *fp = SCM_FSTREAM (port); |
cb63cf9e | 100 | |
19b27fa2 GH |
101 | default_size = (fstat (fp->fdes, &st) == -1) ? default_buffer_size |
102 | : st.st_blksize; | |
cb63cf9e | 103 | #else |
19b27fa2 | 104 | default_size = default_buffer_size; |
cb63cf9e JB |
105 | #endif |
106 | if (read_size == -1) | |
107 | read_size = default_size; | |
108 | if (write_size == -1) | |
109 | write_size = default_size; | |
110 | } | |
0f2d19dd | 111 | |
f5f2dcff | 112 | if (SCM_INPUT_PORT_P (port) && read_size > 0) |
cb63cf9e | 113 | { |
4c9419ac | 114 | pt->read_buf = scm_gc_malloc (read_size, "port buffer"); |
cb63cf9e JB |
115 | pt->read_pos = pt->read_end = pt->read_buf; |
116 | pt->read_buf_size = read_size; | |
117 | } | |
118 | else | |
119 | { | |
840ae05d | 120 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; |
cb63cf9e JB |
121 | pt->read_buf_size = 1; |
122 | } | |
1717856b | 123 | |
f5f2dcff | 124 | if (SCM_OUTPUT_PORT_P (port) && write_size > 0) |
cb63cf9e | 125 | { |
4c9419ac | 126 | pt->write_buf = scm_gc_malloc (write_size, "port buffer"); |
cb63cf9e JB |
127 | pt->write_pos = pt->write_buf; |
128 | pt->write_buf_size = write_size; | |
129 | } | |
130 | else | |
131 | { | |
132 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
133 | pt->write_buf_size = 1; | |
134 | } | |
135 | ||
136 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
137 | if (read_size > 0 || write_size > 0) | |
54778cd3 | 138 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0); |
cb63cf9e | 139 | else |
54778cd3 | 140 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUF0); |
7a6f1ffa | 141 | } |
c6c79933 | 142 | #undef FUNC_NAME |
7a6f1ffa | 143 | |
a1ec6916 | 144 | SCM_DEFINE (scm_setvbuf, "setvbuf", 2, 1, 0, |
1bbd0b84 | 145 | (SCM port, SCM mode, SCM size), |
fc0d72d4 MD |
146 | "Set the buffering mode for @var{port}. @var{mode} can be:\n" |
147 | "@table @code\n" | |
148 | "@item _IONBF\n" | |
149 | "non-buffered\n" | |
150 | "@item _IOLBF\n" | |
151 | "line buffered\n" | |
152 | "@item _IOFBF\n" | |
153 | "block buffered, using a newly allocated buffer of @var{size} bytes.\n" | |
154 | "If @var{size} is omitted, a default size will be used.\n" | |
2c1ae20e | 155 | "@end table") |
1bbd0b84 | 156 | #define FUNC_NAME s_scm_setvbuf |
7a6f1ffa | 157 | { |
1be6b49c | 158 | int cmode; |
c014a02e | 159 | long csize; |
92c2555f | 160 | scm_t_port *pt; |
7a6f1ffa | 161 | |
78446828 MV |
162 | port = SCM_COERCE_OUTPORT (port); |
163 | ||
3b3b36dd GB |
164 | SCM_VALIDATE_OPFPORT (1,port); |
165 | SCM_VALIDATE_INUM_COPY (2,mode,cmode); | |
d3639214 | 166 | if (cmode != _IONBF && cmode != _IOFBF && cmode != _IOLBF) |
1bbd0b84 | 167 | scm_out_of_range (FUNC_NAME, mode); |
d3639214 GH |
168 | |
169 | if (cmode == _IOLBF) | |
170 | { | |
54778cd3 | 171 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUFLINE); |
d3639214 GH |
172 | cmode = _IOFBF; |
173 | } | |
174 | else | |
175 | { | |
54778cd3 | 176 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) ^ SCM_BUFLINE); |
d3639214 GH |
177 | } |
178 | ||
7a6f1ffa | 179 | if (SCM_UNBNDP (size)) |
cb63cf9e JB |
180 | { |
181 | if (cmode == _IOFBF) | |
182 | csize = -1; | |
183 | else | |
184 | csize = 0; | |
185 | } | |
7a6f1ffa GH |
186 | else |
187 | { | |
3b3b36dd | 188 | SCM_VALIDATE_INUM_COPY (3,size,csize); |
cb63cf9e | 189 | if (csize < 0 || (cmode == _IONBF && csize > 0)) |
1bbd0b84 | 190 | scm_out_of_range (FUNC_NAME, size); |
7a6f1ffa | 191 | } |
d3639214 | 192 | |
cb63cf9e | 193 | pt = SCM_PTAB_ENTRY (port); |
7a6f1ffa | 194 | |
4c9419ac MV |
195 | /* silently discards buffered and put-back chars. */ |
196 | if (pt->read_buf == pt->putback_buf) | |
197 | { | |
198 | pt->read_buf = pt->saved_read_buf; | |
199 | pt->read_pos = pt->saved_read_pos; | |
200 | pt->read_end = pt->saved_read_end; | |
201 | pt->read_buf_size = pt->saved_read_buf_size; | |
202 | } | |
cb63cf9e | 203 | if (pt->read_buf != &pt->shortbuf) |
4c9419ac | 204 | scm_gc_free (pt->read_buf, pt->read_buf_size, "port buffer"); |
cb63cf9e | 205 | if (pt->write_buf != &pt->shortbuf) |
4c9419ac | 206 | scm_gc_free (pt->write_buf, pt->write_buf_size, "port buffer"); |
7a6f1ffa | 207 | |
cb63cf9e JB |
208 | scm_fport_buffer_add (port, csize, csize); |
209 | return SCM_UNSPECIFIED; | |
0f2d19dd | 210 | } |
1bbd0b84 | 211 | #undef FUNC_NAME |
0f2d19dd | 212 | |
eadd48de GH |
213 | /* Move ports with the specified file descriptor to new descriptors, |
214 | * reseting the revealed count to 0. | |
0f2d19dd | 215 | */ |
1717856b | 216 | |
eadd48de | 217 | void |
6e8d25a6 | 218 | scm_evict_ports (int fd) |
0f2d19dd | 219 | { |
c014a02e | 220 | long i; |
0f2d19dd | 221 | |
f5fd8aa2 | 222 | for (i = 0; i < scm_port_table_size; i++) |
eadd48de | 223 | { |
f5fd8aa2 | 224 | SCM port = scm_port_table[i]->port; |
cb63cf9e JB |
225 | |
226 | if (SCM_FPORTP (port)) | |
eadd48de | 227 | { |
92c2555f | 228 | scm_t_fport *fp = SCM_FSTREAM (port); |
cb63cf9e JB |
229 | |
230 | if (fp->fdes == fd) | |
231 | { | |
232 | fp->fdes = dup (fd); | |
233 | if (fp->fdes == -1) | |
234 | scm_syserror ("scm_evict_ports"); | |
235 | scm_set_port_revealed_x (port, SCM_MAKINUM (0)); | |
236 | } | |
eadd48de GH |
237 | } |
238 | } | |
239 | } | |
0f2d19dd | 240 | |
efa40607 DH |
241 | |
242 | SCM_DEFINE (scm_file_port_p, "file-port?", 1, 0, 0, | |
243 | (SCM obj), | |
2069af38 | 244 | "Determine whether @var{obj} is a port that is related to a file.") |
efa40607 DH |
245 | #define FUNC_NAME s_scm_file_port_p |
246 | { | |
247 | return SCM_BOOL (SCM_FPORTP (obj)); | |
248 | } | |
249 | #undef FUNC_NAME | |
250 | ||
251 | ||
0f2d19dd JB |
252 | /* scm_open_file |
253 | * Return a new port open on a given file. | |
254 | * | |
255 | * The mode string must match the pattern: [rwa+]** which | |
256 | * is interpreted in the usual unix way. | |
257 | * | |
258 | * Return the new port. | |
259 | */ | |
3b3b36dd | 260 | SCM_DEFINE (scm_open_file, "open-file", 2, 0, 0, |
1e6808ea MG |
261 | (SCM filename, SCM mode), |
262 | "Open the file whose name is @var{filename}, and return a port\n" | |
fc0d72d4 | 263 | "representing that file. The attributes of the port are\n" |
1e6808ea MG |
264 | "determined by the @var{mode} string. The way in which this is\n" |
265 | "interpreted is similar to C stdio. The first character must be\n" | |
266 | "one of the following:\n" | |
fc0d72d4 MD |
267 | "@table @samp\n" |
268 | "@item r\n" | |
269 | "Open an existing file for input.\n" | |
270 | "@item w\n" | |
271 | "Open a file for output, creating it if it doesn't already exist\n" | |
272 | "or removing its contents if it does.\n" | |
273 | "@item a\n" | |
1e6808ea MG |
274 | "Open a file for output, creating it if it doesn't already\n" |
275 | "exist. All writes to the port will go to the end of the file.\n" | |
fc0d72d4 MD |
276 | "The \"append mode\" can be turned off while the port is in use\n" |
277 | "@pxref{Ports and File Descriptors, fcntl}\n" | |
1e6808ea MG |
278 | "@end table\n" |
279 | "The following additional characters can be appended:\n" | |
fc0d72d4 MD |
280 | "@table @samp\n" |
281 | "@item +\n" | |
282 | "Open the port for both input and output. E.g., @code{r+}: open\n" | |
283 | "an existing file for both input and output.\n" | |
284 | "@item 0\n" | |
1e6808ea MG |
285 | "Create an \"unbuffered\" port. In this case input and output\n" |
286 | "operations are passed directly to the underlying port\n" | |
287 | "implementation without additional buffering. This is likely to\n" | |
288 | "slow down I/O operations. The buffering mode can be changed\n" | |
289 | "while a port is in use @pxref{Ports and File Descriptors,\n" | |
290 | "setvbuf}\n" | |
fc0d72d4 MD |
291 | "@item l\n" |
292 | "Add line-buffering to the port. The port output buffer will be\n" | |
293 | "automatically flushed whenever a newline character is written.\n" | |
1e6808ea MG |
294 | "@end table\n" |
295 | "In theory we could create read/write ports which were buffered\n" | |
296 | "in one direction only. However this isn't included in the\n" | |
297 | "current interfaces. If a file cannot be opened with the access\n" | |
298 | "requested, @code{open-file} throws an exception.") | |
1bbd0b84 | 299 | #define FUNC_NAME s_scm_open_file |
0f2d19dd | 300 | { |
19639113 | 301 | SCM port; |
cb63cf9e JB |
302 | int fdes; |
303 | int flags = 0; | |
19639113 | 304 | char *file; |
1e6808ea | 305 | char *md; |
cb63cf9e | 306 | char *ptr; |
19639113 | 307 | |
a6d9e5ab | 308 | SCM_VALIDATE_STRING (1, filename); |
1e6808ea | 309 | SCM_VALIDATE_STRING (2, mode); |
19639113 | 310 | |
a6d9e5ab | 311 | file = SCM_STRING_CHARS (filename); |
1e6808ea | 312 | md = SCM_STRING_CHARS (mode); |
19639113 | 313 | |
1e6808ea | 314 | switch (*md) |
0f2d19dd | 315 | { |
cb63cf9e JB |
316 | case 'r': |
317 | flags |= O_RDONLY; | |
318 | break; | |
319 | case 'w': | |
320 | flags |= O_WRONLY | O_CREAT | O_TRUNC; | |
321 | break; | |
322 | case 'a': | |
323 | flags |= O_WRONLY | O_CREAT | O_APPEND; | |
324 | break; | |
325 | default: | |
1e6808ea | 326 | scm_out_of_range (FUNC_NAME, mode); |
0f2d19dd | 327 | } |
1e6808ea | 328 | ptr = md + 1; |
cb63cf9e | 329 | while (*ptr != '\0') |
e145dd02 | 330 | { |
cb63cf9e JB |
331 | switch (*ptr) |
332 | { | |
333 | case '+': | |
334 | flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR; | |
335 | break; | |
9f561420 GH |
336 | case 'b': |
337 | #if defined (O_BINARY) | |
338 | flags |= O_BINARY; | |
339 | #endif | |
340 | break; | |
cb63cf9e | 341 | case '0': /* unbuffered: handled later. */ |
d3639214 | 342 | case 'l': /* line buffered: handled during output. */ |
cb63cf9e JB |
343 | break; |
344 | default: | |
1e6808ea | 345 | scm_out_of_range (FUNC_NAME, mode); |
cb63cf9e JB |
346 | } |
347 | ptr++; | |
e145dd02 | 348 | } |
cb63cf9e JB |
349 | SCM_SYSCALL (fdes = open (file, flags, 0666)); |
350 | if (fdes == -1) | |
e145dd02 | 351 | { |
cb63cf9e JB |
352 | int en = errno; |
353 | ||
5d2d2ffc | 354 | SCM_SYSERROR_MSG ("~A: ~S", |
cb63cf9e | 355 | scm_cons (scm_makfrom0str (strerror (en)), |
5d2d2ffc | 356 | scm_cons (filename, SCM_EOL)), en); |
0f2d19dd | 357 | } |
1e6808ea | 358 | port = scm_fdes_to_port (fdes, md, filename); |
0f2d19dd JB |
359 | return port; |
360 | } | |
1bbd0b84 | 361 | #undef FUNC_NAME |
0f2d19dd | 362 | |
e145dd02 | 363 | \f |
82893676 MG |
364 | #ifdef __MINGW32__ |
365 | /* | |
366 | * Try getting the appropiate file flags for a given file descriptor | |
367 | * under Windows. This incorporates some fancy operations because Windows | |
368 | * differentiates between file, pipe and socket descriptors. | |
369 | */ | |
370 | #ifndef O_ACCMODE | |
371 | # define O_ACCMODE 0x0003 | |
372 | #endif | |
373 | ||
374 | static int getflags (int fdes) | |
375 | { | |
376 | int flags = 0; | |
377 | struct stat buf; | |
378 | int error, optlen = sizeof (int); | |
379 | ||
380 | /* Is this a socket ? */ | |
381 | if (getsockopt (fdes, SOL_SOCKET, SO_ERROR, (void *) &error, &optlen) >= 0) | |
382 | flags = O_RDWR; | |
383 | /* Maybe a regular file ? */ | |
384 | else if (fstat (fdes, &buf) < 0) | |
385 | flags = -1; | |
386 | else | |
387 | { | |
388 | /* Or an anonymous pipe handle ? */ | |
b8b17bfd | 389 | if (buf.st_mode & _S_IFIFO) |
8f99e3f3 SJ |
390 | flags = PeekNamedPipe ((HANDLE) _get_osfhandle (fdes), NULL, 0, |
391 | NULL, NULL, NULL) ? O_RDONLY : O_WRONLY; | |
82893676 | 392 | /* stdin ? */ |
b8b17bfd | 393 | else if (fdes == fileno (stdin) && isatty (fdes)) |
82893676 MG |
394 | flags = O_RDONLY; |
395 | /* stdout / stderr ? */ | |
b8b17bfd MV |
396 | else if ((fdes == fileno (stdout) || fdes == fileno (stderr)) && |
397 | isatty (fdes)) | |
82893676 MG |
398 | flags = O_WRONLY; |
399 | else | |
400 | flags = buf.st_mode; | |
401 | } | |
402 | return flags; | |
403 | } | |
404 | #endif /* __MINGW32__ */ | |
405 | ||
cb63cf9e | 406 | /* Building Guile ports from a file descriptor. */ |
e145dd02 | 407 | |
cb63cf9e | 408 | /* Build a Scheme port from an open file descriptor `fdes'. |
a089567e JB |
409 | MODE indicates whether FILE is open for reading or writing; it uses |
410 | the same notation as open-file's second argument. | |
19b27fa2 GH |
411 | NAME is a string to be used as the port's filename. |
412 | */ | |
a089567e | 413 | SCM |
cb63cf9e | 414 | scm_fdes_to_port (int fdes, char *mode, SCM name) |
19b27fa2 | 415 | #define FUNC_NAME "scm_fdes_to_port" |
a089567e JB |
416 | { |
417 | long mode_bits = scm_mode_bits (mode); | |
418 | SCM port; | |
92c2555f | 419 | scm_t_port *pt; |
19b27fa2 GH |
420 | int flags; |
421 | ||
422 | /* test that fdes is valid. */ | |
82893676 MG |
423 | #ifdef __MINGW32__ |
424 | flags = getflags (fdes); | |
425 | #else | |
19b27fa2 | 426 | flags = fcntl (fdes, F_GETFL, 0); |
82893676 | 427 | #endif |
19b27fa2 GH |
428 | if (flags == -1) |
429 | SCM_SYSERROR; | |
430 | flags &= O_ACCMODE; | |
431 | if (flags != O_RDWR | |
432 | && ((flags != O_WRONLY && (mode_bits & SCM_WRTNG)) | |
433 | || (flags != O_RDONLY && (mode_bits & SCM_RDNG)))) | |
434 | { | |
435 | SCM_MISC_ERROR ("requested file mode not available on fdes", SCM_EOL); | |
436 | } | |
a089567e | 437 | |
16d4699b | 438 | port = scm_alloc_cell (scm_tc16_fport, 0); |
a089567e | 439 | SCM_DEFER_INTS; |
cb63cf9e JB |
440 | pt = scm_add_to_port_table (port); |
441 | SCM_SETPTAB_ENTRY (port, pt); | |
54778cd3 | 442 | SCM_SET_CELL_TYPE (port, (scm_tc16_fport | mode_bits)); |
cb63cf9e | 443 | |
a089567e | 444 | { |
92c2555f | 445 | scm_t_fport *fp |
4c9419ac | 446 | = (scm_t_fport *) scm_gc_malloc (sizeof (scm_t_fport), "file port"); |
c6c79933 | 447 | |
cb63cf9e | 448 | fp->fdes = fdes; |
0de97b83 | 449 | pt->rw_random = SCM_FDES_RANDOM_P (fdes); |
cb63cf9e JB |
450 | SCM_SETSTREAM (port, fp); |
451 | if (mode_bits & SCM_BUF0) | |
452 | scm_fport_buffer_add (port, 0, 0); | |
453 | else | |
454 | scm_fport_buffer_add (port, -1, -1); | |
a089567e | 455 | } |
b24b5e13 | 456 | SCM_SET_FILENAME (port, name); |
a089567e | 457 | SCM_ALLOW_INTS; |
e145dd02 JB |
458 | return port; |
459 | } | |
19b27fa2 | 460 | #undef FUNC_NAME |
e145dd02 | 461 | |
affc96b5 | 462 | /* Return a lower bound on the number of bytes available for input. */ |
cb63cf9e | 463 | static int |
affc96b5 | 464 | fport_input_waiting (SCM port) |
e145dd02 | 465 | { |
cb63cf9e JB |
466 | int fdes = SCM_FSTREAM (port)->fdes; |
467 | ||
468 | #ifdef HAVE_SELECT | |
469 | struct timeval timeout; | |
470 | SELECT_TYPE read_set; | |
471 | SELECT_TYPE write_set; | |
472 | SELECT_TYPE except_set; | |
473 | ||
474 | FD_ZERO (&read_set); | |
475 | FD_ZERO (&write_set); | |
476 | FD_ZERO (&except_set); | |
477 | ||
478 | FD_SET (fdes, &read_set); | |
479 | ||
480 | timeout.tv_sec = 0; | |
481 | timeout.tv_usec = 0; | |
482 | ||
483 | if (select (SELECT_SET_SIZE, | |
484 | &read_set, &write_set, &except_set, &timeout) | |
485 | < 0) | |
affc96b5 GH |
486 | scm_syserror ("fport_input_waiting"); |
487 | return FD_ISSET (fdes, &read_set) ? 1 : 0; | |
cb63cf9e JB |
488 | #elif defined (FIONREAD) |
489 | int remir; | |
490 | ioctl(fdes, FIONREAD, &remir); | |
491 | return remir; | |
492 | #else | |
affc96b5 | 493 | scm_misc_error ("fport_input_waiting", |
cb63cf9e JB |
494 | "Not fully implemented on this platform", |
495 | SCM_EOL); | |
496 | #endif | |
a089567e JB |
497 | } |
498 | ||
cb63cf9e | 499 | \f |
0f2d19dd | 500 | static int |
e81d98ec | 501 | fport_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) |
0f2d19dd | 502 | { |
b3ec3c64 MD |
503 | scm_puts ("#<", port); |
504 | scm_print_port_mode (exp, port); | |
505 | if (SCM_OPFPORTP (exp)) | |
0f2d19dd | 506 | { |
b3ec3c64 | 507 | int fdes; |
b24b5e13 DH |
508 | SCM name = SCM_FILENAME (exp); |
509 | if (SCM_STRINGP (name) || SCM_SYMBOLP (name)) | |
510 | scm_display (name, port); | |
511 | else | |
512 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); | |
b3ec3c64 MD |
513 | scm_putc (' ', port); |
514 | fdes = (SCM_FSTREAM (exp))->fdes; | |
515 | ||
82893676 | 516 | #ifdef HAVE_TTYNAME |
b3ec3c64 MD |
517 | if (isatty (fdes)) |
518 | scm_puts (ttyname (fdes), port); | |
519 | else | |
82893676 | 520 | #endif /* HAVE_TTYNAME */ |
b3ec3c64 | 521 | scm_intprint (fdes, 10, port); |
0f2d19dd JB |
522 | } |
523 | else | |
524 | { | |
b3ec3c64 MD |
525 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); |
526 | scm_putc (' ', port); | |
63bcad19 | 527 | scm_intprint ((scm_t_bits) SCM_PTAB_ENTRY (exp), 16, port); |
0f2d19dd | 528 | } |
b3ec3c64 MD |
529 | scm_putc ('>', port); |
530 | return 1; | |
0f2d19dd JB |
531 | } |
532 | ||
cb63cf9e JB |
533 | #ifdef GUILE_ISELECT |
534 | /* thread-local block for input on fport's fdes. */ | |
535 | static void | |
536 | fport_wait_for_input (SCM port) | |
3cb988bd | 537 | { |
cb63cf9e | 538 | int fdes = SCM_FSTREAM (port)->fdes; |
3cb988bd | 539 | |
affc96b5 | 540 | if (!fport_input_waiting (port)) |
8122b543 | 541 | { |
cb63cf9e JB |
542 | int n; |
543 | SELECT_TYPE readfds; | |
544 | int flags = fcntl (fdes, F_GETFL); | |
545 | ||
546 | if (flags == -1) | |
547 | scm_syserror ("scm_fdes_wait_for_input"); | |
548 | if (!(flags & O_NONBLOCK)) | |
549 | do | |
550 | { | |
551 | FD_ZERO (&readfds); | |
552 | FD_SET (fdes, &readfds); | |
553 | n = scm_internal_select (fdes + 1, &readfds, NULL, NULL, NULL); | |
554 | } | |
555 | while (n == -1 && errno == EINTR); | |
8122b543 | 556 | } |
3cb988bd | 557 | } |
0f2d19dd JB |
558 | #endif |
559 | ||
affc96b5 | 560 | static void fport_flush (SCM port); |
0f2d19dd | 561 | |
c2da2648 GH |
562 | /* fill a port's read-buffer with a single read. returns the first |
563 | char or EOF if end of file. */ | |
0f2d19dd | 564 | static int |
affc96b5 | 565 | fport_fill_input (SCM port) |
0f2d19dd | 566 | { |
c014a02e | 567 | long count; |
92c2555f MV |
568 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
569 | scm_t_fport *fp = SCM_FSTREAM (port); | |
cb63cf9e | 570 | |
cb63cf9e JB |
571 | #ifdef GUILE_ISELECT |
572 | fport_wait_for_input (port); | |
573 | #endif | |
574 | SCM_SYSCALL (count = read (fp->fdes, pt->read_buf, pt->read_buf_size)); | |
575 | if (count == -1) | |
affc96b5 | 576 | scm_syserror ("fport_fill_input"); |
cb63cf9e JB |
577 | if (count == 0) |
578 | return EOF; | |
579 | else | |
580 | { | |
5c070ca7 | 581 | pt->read_pos = pt->read_buf; |
cb63cf9e | 582 | pt->read_end = pt->read_buf + count; |
5c070ca7 | 583 | return *pt->read_buf; |
cb63cf9e | 584 | } |
0f2d19dd JB |
585 | } |
586 | ||
cb63cf9e | 587 | static off_t |
affc96b5 | 588 | fport_seek (SCM port, off_t offset, int whence) |
0f2d19dd | 589 | { |
92c2555f MV |
590 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
591 | scm_t_fport *fp = SCM_FSTREAM (port); | |
7dcb364d GH |
592 | off_t rv; |
593 | off_t result; | |
594 | ||
595 | if (pt->rw_active == SCM_PORT_WRITE) | |
596 | { | |
597 | if (offset != 0 || whence != SEEK_CUR) | |
598 | { | |
599 | fport_flush (port); | |
600 | result = rv = lseek (fp->fdes, offset, whence); | |
601 | } | |
602 | else | |
603 | { | |
604 | /* read current position without disturbing the buffer. */ | |
605 | rv = lseek (fp->fdes, offset, whence); | |
606 | result = rv + (pt->write_pos - pt->write_buf); | |
607 | } | |
608 | } | |
609 | else if (pt->rw_active == SCM_PORT_READ) | |
610 | { | |
611 | if (offset != 0 || whence != SEEK_CUR) | |
612 | { | |
613 | /* could expand to avoid a second seek. */ | |
614 | scm_end_input (port); | |
615 | result = rv = lseek (fp->fdes, offset, whence); | |
616 | } | |
617 | else | |
618 | { | |
619 | /* read current position without disturbing the buffer | |
620 | (particularly the unread-char buffer). */ | |
621 | rv = lseek (fp->fdes, offset, whence); | |
622 | result = rv - (pt->read_end - pt->read_pos); | |
623 | ||
624 | if (pt->read_buf == pt->putback_buf) | |
625 | result -= pt->saved_read_end - pt->saved_read_pos; | |
626 | } | |
627 | } | |
628 | else /* SCM_PORT_NEITHER */ | |
629 | { | |
630 | result = rv = lseek (fp->fdes, offset, whence); | |
631 | } | |
cb8dfa3f | 632 | |
7dcb364d | 633 | if (rv == -1) |
affc96b5 | 634 | scm_syserror ("fport_seek"); |
7dcb364d | 635 | |
cb8dfa3f | 636 | return result; |
0f2d19dd JB |
637 | } |
638 | ||
840ae05d | 639 | static void |
affc96b5 | 640 | fport_truncate (SCM port, off_t length) |
840ae05d | 641 | { |
92c2555f | 642 | scm_t_fport *fp = SCM_FSTREAM (port); |
840ae05d JB |
643 | |
644 | if (ftruncate (fp->fdes, length) == -1) | |
645 | scm_syserror ("ftruncate"); | |
646 | } | |
647 | ||
0c6d2191 GH |
648 | /* helper for fport_write: try to write data, using multiple system |
649 | calls if required. */ | |
650 | #define FUNC_NAME "write_all" | |
651 | static void write_all (SCM port, const void *data, size_t remaining) | |
652 | { | |
653 | int fdes = SCM_FSTREAM (port)->fdes; | |
654 | ||
655 | while (remaining > 0) | |
656 | { | |
82893676 | 657 | size_t done; |
0c6d2191 GH |
658 | |
659 | SCM_SYSCALL (done = write (fdes, data, remaining)); | |
660 | ||
661 | if (done == -1) | |
662 | SCM_SYSERROR; | |
663 | remaining -= done; | |
664 | data = ((const char *) data) + done; | |
665 | } | |
666 | } | |
667 | #undef FUNC_NAME | |
668 | ||
31703ab8 | 669 | static void |
8aa011a1 | 670 | fport_write (SCM port, const void *data, size_t size) |
31703ab8 | 671 | { |
0c6d2191 | 672 | /* this procedure tries to minimize the number of writes/flushes. */ |
92c2555f | 673 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
31703ab8 | 674 | |
0c6d2191 GH |
675 | if (pt->write_buf == &pt->shortbuf |
676 | || (pt->write_pos == pt->write_buf && size >= pt->write_buf_size)) | |
31703ab8 | 677 | { |
0c6d2191 GH |
678 | /* "unbuffered" port, or |
679 | port with empty buffer and data won't fit in buffer. */ | |
680 | write_all (port, data, size); | |
681 | return; | |
31703ab8 | 682 | } |
d3639214 | 683 | |
0c6d2191 GH |
684 | { |
685 | off_t space = pt->write_end - pt->write_pos; | |
686 | ||
687 | if (size <= space) | |
688 | { | |
689 | /* data fits in buffer. */ | |
690 | memcpy (pt->write_pos, data, size); | |
691 | pt->write_pos += size; | |
692 | if (pt->write_pos == pt->write_end) | |
693 | { | |
affc96b5 | 694 | fport_flush (port); |
0c6d2191 GH |
695 | /* we can skip the line-buffering check if nothing's buffered. */ |
696 | return; | |
697 | } | |
698 | } | |
699 | else | |
700 | { | |
701 | memcpy (pt->write_pos, data, space); | |
702 | pt->write_pos = pt->write_end; | |
703 | fport_flush (port); | |
704 | { | |
705 | const void *ptr = ((const char *) data) + space; | |
706 | size_t remaining = size - space; | |
707 | ||
708 | if (size >= pt->write_buf_size) | |
709 | { | |
710 | write_all (port, ptr, remaining); | |
711 | return; | |
712 | } | |
713 | else | |
714 | { | |
715 | memcpy (pt->write_pos, ptr, remaining); | |
716 | pt->write_pos += remaining; | |
717 | } | |
31703ab8 | 718 | } |
0c6d2191 | 719 | } |
31703ab8 | 720 | |
0c6d2191 GH |
721 | /* handle line buffering. */ |
722 | if ((SCM_CELL_WORD_0 (port) & SCM_BUFLINE) && memchr (data, '\n', size)) | |
723 | fport_flush (port); | |
724 | } | |
31703ab8 GH |
725 | } |
726 | ||
727 | /* becomes 1 when process is exiting: normal exception handling won't | |
728 | work by this time. */ | |
cb63cf9e | 729 | extern int terminating; |
0f2d19dd | 730 | |
cb63cf9e | 731 | static void |
affc96b5 | 732 | fport_flush (SCM port) |
0f2d19dd | 733 | { |
92c2555f MV |
734 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
735 | scm_t_fport *fp = SCM_FSTREAM (port); | |
6f760c1d | 736 | unsigned char *ptr = pt->write_buf; |
c014a02e ML |
737 | long init_size = pt->write_pos - pt->write_buf; |
738 | long remaining = init_size; | |
0f2d19dd | 739 | |
cb63cf9e JB |
740 | while (remaining > 0) |
741 | { | |
c014a02e | 742 | long count; |
cb63cf9e JB |
743 | |
744 | SCM_SYSCALL (count = write (fp->fdes, ptr, remaining)); | |
745 | if (count < 0) | |
746 | { | |
747 | /* error. assume nothing was written this call, but | |
748 | fix up the buffer for any previous successful writes. */ | |
c014a02e | 749 | long done = init_size - remaining; |
cb63cf9e JB |
750 | |
751 | if (done > 0) | |
752 | { | |
753 | int i; | |
754 | ||
755 | for (i = 0; i < remaining; i++) | |
756 | { | |
757 | *(pt->write_buf + i) = *(pt->write_buf + done + i); | |
758 | } | |
759 | pt->write_pos = pt->write_buf + remaining; | |
760 | } | |
6b72ac1d | 761 | if (terminating) |
cb63cf9e JB |
762 | { |
763 | const char *msg = "Error: could not flush file-descriptor "; | |
764 | char buf[11]; | |
765 | ||
766 | write (2, msg, strlen (msg)); | |
767 | sprintf (buf, "%d\n", fp->fdes); | |
768 | write (2, buf, strlen (buf)); | |
769 | ||
770 | count = remaining; | |
771 | } | |
6b72ac1d GH |
772 | else if (scm_gc_running_p) |
773 | { | |
774 | /* silently ignore the error. scm_error would abort if we | |
775 | called it now. */ | |
776 | count = remaining; | |
777 | } | |
778 | else | |
779 | scm_syserror ("fport_flush"); | |
cb63cf9e JB |
780 | } |
781 | ptr += count; | |
782 | remaining -= count; | |
783 | } | |
784 | pt->write_pos = pt->write_buf; | |
61e452ba | 785 | pt->rw_active = SCM_PORT_NEITHER; |
840ae05d JB |
786 | } |
787 | ||
283a1a0e | 788 | /* clear the read buffer and adjust the file position for unread bytes. */ |
840ae05d | 789 | static void |
affc96b5 | 790 | fport_end_input (SCM port, int offset) |
840ae05d | 791 | { |
92c2555f MV |
792 | scm_t_fport *fp = SCM_FSTREAM (port); |
793 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
283a1a0e GH |
794 | |
795 | offset += pt->read_end - pt->read_pos; | |
840ae05d | 796 | |
840ae05d JB |
797 | if (offset > 0) |
798 | { | |
799 | pt->read_pos = pt->read_end; | |
800 | /* will throw error if unread-char used at beginning of file | |
801 | then attempting to write. seems correct. */ | |
802 | if (lseek (fp->fdes, -offset, SEEK_CUR) == -1) | |
affc96b5 | 803 | scm_syserror ("fport_end_input"); |
840ae05d | 804 | } |
61e452ba | 805 | pt->rw_active = SCM_PORT_NEITHER; |
8f29fbd0 JB |
806 | } |
807 | ||
6a2c4c81 | 808 | static int |
affc96b5 | 809 | fport_close (SCM port) |
6a2c4c81 | 810 | { |
92c2555f MV |
811 | scm_t_fport *fp = SCM_FSTREAM (port); |
812 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
cb63cf9e | 813 | int rv; |
840ae05d | 814 | |
affc96b5 | 815 | fport_flush (port); |
cb63cf9e JB |
816 | SCM_SYSCALL (rv = close (fp->fdes)); |
817 | if (rv == -1 && errno != EBADF) | |
6b72ac1d GH |
818 | { |
819 | if (scm_gc_running_p) | |
820 | /* silently ignore the error. scm_error would abort if we | |
821 | called it now. */ | |
822 | ; | |
823 | else | |
824 | scm_syserror ("fport_close"); | |
825 | } | |
6c951427 GH |
826 | if (pt->read_buf == pt->putback_buf) |
827 | pt->read_buf = pt->saved_read_buf; | |
cb63cf9e | 828 | if (pt->read_buf != &pt->shortbuf) |
4c9419ac | 829 | scm_gc_free (pt->read_buf, pt->read_buf_size, "port buffer"); |
cb63cf9e | 830 | if (pt->write_buf != &pt->shortbuf) |
4c9419ac MV |
831 | scm_gc_free (pt->write_buf, pt->write_buf_size, "port buffer"); |
832 | scm_gc_free (fp, sizeof (*fp), "file port"); | |
cb63cf9e | 833 | return rv; |
6a2c4c81 JB |
834 | } |
835 | ||
1be6b49c | 836 | static size_t |
affc96b5 | 837 | fport_free (SCM port) |
b3ec3c64 | 838 | { |
affc96b5 | 839 | fport_close (port); |
b3ec3c64 MD |
840 | return 0; |
841 | } | |
842 | ||
92c2555f | 843 | static scm_t_bits |
b3ec3c64 MD |
844 | scm_make_fptob () |
845 | { | |
92c2555f | 846 | scm_t_bits tc = scm_make_port_type ("file", fport_fill_input, fport_write); |
a98bddfd | 847 | |
affc96b5 | 848 | scm_set_port_free (tc, fport_free); |
e841c3e0 | 849 | scm_set_port_print (tc, fport_print); |
affc96b5 GH |
850 | scm_set_port_flush (tc, fport_flush); |
851 | scm_set_port_end_input (tc, fport_end_input); | |
852 | scm_set_port_close (tc, fport_close); | |
853 | scm_set_port_seek (tc, fport_seek); | |
854 | scm_set_port_truncate (tc, fport_truncate); | |
855 | scm_set_port_input_waiting (tc, fport_input_waiting); | |
a98bddfd DH |
856 | |
857 | return tc; | |
b3ec3c64 | 858 | } |
0f2d19dd | 859 | |
0f2d19dd JB |
860 | void |
861 | scm_init_fports () | |
0f2d19dd | 862 | { |
a98bddfd DH |
863 | scm_tc16_fport = scm_make_fptob (); |
864 | ||
86d31dfe MV |
865 | scm_c_define ("_IOFBF", SCM_MAKINUM (_IOFBF)); |
866 | scm_c_define ("_IOLBF", SCM_MAKINUM (_IOLBF)); | |
867 | scm_c_define ("_IONBF", SCM_MAKINUM (_IONBF)); | |
a98bddfd DH |
868 | |
869 | #ifndef SCM_MAGIC_SNARFER | |
870 | #include "libguile/fports.x" | |
871 | #endif | |
0f2d19dd | 872 | } |
89e00824 ML |
873 | |
874 | /* | |
875 | Local Variables: | |
876 | c-file-style: "gnu" | |
877 | End: | |
878 | */ |