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 GB |
41 | |
42 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, | |
43 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
44 | ||
0f2d19dd JB |
45 | \f |
46 | ||
47 | #include <stdio.h> | |
cb63cf9e | 48 | #include <fcntl.h> |
a0599745 MD |
49 | #include "libguile/_scm.h" |
50 | #include "libguile/strings.h" | |
a0599745 | 51 | #include "libguile/validate.h" |
6b72ac1d GH |
52 | #include "libguile/gc.h" |
53 | ||
a0599745 | 54 | #include "libguile/fports.h" |
95b88819 GH |
55 | |
56 | #ifdef HAVE_STRING_H | |
57 | #include <string.h> | |
58 | #endif | |
0f2d19dd JB |
59 | #ifdef HAVE_UNISTD_H |
60 | #include <unistd.h> | |
61 | #else | |
1be6b49c | 62 | size_t fwrite (); |
0f2d19dd | 63 | #endif |
f47a5239 | 64 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
cb63cf9e JB |
65 | #include <sys/stat.h> |
66 | #endif | |
0f2d19dd | 67 | |
cb63cf9e | 68 | #include <errno.h> |
e145dd02 | 69 | |
a0599745 | 70 | #include "libguile/iselect.h" |
82893676 MG |
71 | /* Some defines for Windows. */ |
72 | #ifdef __MINGW32__ | |
73 | # include <sys/stat.h> | |
74 | # include <winsock2.h> | |
75 | # define ftruncate(fd, size) chsize (fd, size) | |
76 | #endif /* __MINGW32__ */ | |
cb63cf9e | 77 | |
a98bddfd | 78 | |
92c2555f | 79 | scm_t_bits scm_tc16_fport; |
a98bddfd DH |
80 | |
81 | ||
19b27fa2 | 82 | /* default buffer size, used if the O/S won't supply a value. */ |
1be6b49c | 83 | static const size_t default_buffer_size = 1024; |
19b27fa2 | 84 | |
cb63cf9e JB |
85 | /* create FPORT buffer with specified sizes (or -1 to use default size or |
86 | 0 for no buffer. */ | |
87 | static void | |
c014a02e | 88 | scm_fport_buffer_add (SCM port, long read_size, int write_size) |
c6c79933 | 89 | #define FUNC_NAME "scm_fport_buffer_add" |
e145dd02 | 90 | { |
92c2555f MV |
91 | scm_t_fport *fp = SCM_FSTREAM (port); |
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 JB |
98 | struct stat st; |
99 | ||
19b27fa2 GH |
100 | default_size = (fstat (fp->fdes, &st) == -1) ? default_buffer_size |
101 | : st.st_blksize; | |
cb63cf9e | 102 | #else |
19b27fa2 | 103 | default_size = default_buffer_size; |
cb63cf9e JB |
104 | #endif |
105 | if (read_size == -1) | |
106 | read_size = default_size; | |
107 | if (write_size == -1) | |
108 | write_size = default_size; | |
109 | } | |
0f2d19dd | 110 | |
f5f2dcff | 111 | if (SCM_INPUT_PORT_P (port) && read_size > 0) |
cb63cf9e | 112 | { |
c6c79933 | 113 | pt->read_buf = scm_must_malloc (read_size, FUNC_NAME); |
cb63cf9e JB |
114 | pt->read_pos = pt->read_end = pt->read_buf; |
115 | pt->read_buf_size = read_size; | |
116 | } | |
117 | else | |
118 | { | |
840ae05d | 119 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; |
cb63cf9e JB |
120 | pt->read_buf_size = 1; |
121 | } | |
1717856b | 122 | |
f5f2dcff | 123 | if (SCM_OUTPUT_PORT_P (port) && write_size > 0) |
cb63cf9e | 124 | { |
c6c79933 | 125 | pt->write_buf = scm_must_malloc (write_size, FUNC_NAME); |
cb63cf9e JB |
126 | pt->write_pos = pt->write_buf; |
127 | pt->write_buf_size = write_size; | |
128 | } | |
129 | else | |
130 | { | |
131 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
132 | pt->write_buf_size = 1; | |
133 | } | |
134 | ||
135 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
136 | if (read_size > 0 || write_size > 0) | |
54778cd3 | 137 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0); |
cb63cf9e | 138 | else |
54778cd3 | 139 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUF0); |
7a6f1ffa | 140 | } |
c6c79933 | 141 | #undef FUNC_NAME |
7a6f1ffa | 142 | |
a1ec6916 | 143 | SCM_DEFINE (scm_setvbuf, "setvbuf", 2, 1, 0, |
1bbd0b84 | 144 | (SCM port, SCM mode, SCM size), |
fc0d72d4 MD |
145 | "Set the buffering mode for @var{port}. @var{mode} can be:\n" |
146 | "@table @code\n" | |
147 | "@item _IONBF\n" | |
148 | "non-buffered\n" | |
149 | "@item _IOLBF\n" | |
150 | "line buffered\n" | |
151 | "@item _IOFBF\n" | |
152 | "block buffered, using a newly allocated buffer of @var{size} bytes.\n" | |
153 | "If @var{size} is omitted, a default size will be used.\n" | |
2c1ae20e | 154 | "@end table") |
1bbd0b84 | 155 | #define FUNC_NAME s_scm_setvbuf |
7a6f1ffa | 156 | { |
1be6b49c | 157 | int cmode; |
c014a02e | 158 | long csize; |
92c2555f | 159 | scm_t_port *pt; |
7a6f1ffa | 160 | |
78446828 MV |
161 | port = SCM_COERCE_OUTPORT (port); |
162 | ||
3b3b36dd GB |
163 | SCM_VALIDATE_OPFPORT (1,port); |
164 | SCM_VALIDATE_INUM_COPY (2,mode,cmode); | |
d3639214 | 165 | if (cmode != _IONBF && cmode != _IOFBF && cmode != _IOLBF) |
1bbd0b84 | 166 | scm_out_of_range (FUNC_NAME, mode); |
d3639214 GH |
167 | |
168 | if (cmode == _IOLBF) | |
169 | { | |
54778cd3 | 170 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUFLINE); |
d3639214 GH |
171 | cmode = _IOFBF; |
172 | } | |
173 | else | |
174 | { | |
54778cd3 | 175 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) ^ SCM_BUFLINE); |
d3639214 GH |
176 | } |
177 | ||
7a6f1ffa | 178 | if (SCM_UNBNDP (size)) |
cb63cf9e JB |
179 | { |
180 | if (cmode == _IOFBF) | |
181 | csize = -1; | |
182 | else | |
183 | csize = 0; | |
184 | } | |
7a6f1ffa GH |
185 | else |
186 | { | |
3b3b36dd | 187 | SCM_VALIDATE_INUM_COPY (3,size,csize); |
cb63cf9e | 188 | if (csize < 0 || (cmode == _IONBF && csize > 0)) |
1bbd0b84 | 189 | scm_out_of_range (FUNC_NAME, size); |
7a6f1ffa | 190 | } |
d3639214 | 191 | |
cb63cf9e | 192 | pt = SCM_PTAB_ENTRY (port); |
7a6f1ffa | 193 | |
cb63cf9e JB |
194 | /* silently discards buffered chars. */ |
195 | if (pt->read_buf != &pt->shortbuf) | |
c6c79933 | 196 | scm_must_free (pt->read_buf); |
cb63cf9e | 197 | if (pt->write_buf != &pt->shortbuf) |
c6c79933 | 198 | scm_must_free (pt->write_buf); |
7a6f1ffa | 199 | |
cb63cf9e JB |
200 | scm_fport_buffer_add (port, csize, csize); |
201 | return SCM_UNSPECIFIED; | |
0f2d19dd | 202 | } |
1bbd0b84 | 203 | #undef FUNC_NAME |
0f2d19dd | 204 | |
eadd48de GH |
205 | /* Move ports with the specified file descriptor to new descriptors, |
206 | * reseting the revealed count to 0. | |
0f2d19dd | 207 | */ |
1717856b | 208 | |
eadd48de | 209 | void |
6e8d25a6 | 210 | scm_evict_ports (int fd) |
0f2d19dd | 211 | { |
c014a02e | 212 | long i; |
0f2d19dd | 213 | |
92c2555f | 214 | for (i = 0; i < scm_t_portable_size; i++) |
eadd48de | 215 | { |
92c2555f | 216 | SCM port = scm_t_portable[i]->port; |
cb63cf9e JB |
217 | |
218 | if (SCM_FPORTP (port)) | |
eadd48de | 219 | { |
92c2555f | 220 | scm_t_fport *fp = SCM_FSTREAM (port); |
cb63cf9e JB |
221 | |
222 | if (fp->fdes == fd) | |
223 | { | |
224 | fp->fdes = dup (fd); | |
225 | if (fp->fdes == -1) | |
226 | scm_syserror ("scm_evict_ports"); | |
227 | scm_set_port_revealed_x (port, SCM_MAKINUM (0)); | |
228 | } | |
eadd48de GH |
229 | } |
230 | } | |
231 | } | |
0f2d19dd | 232 | |
efa40607 DH |
233 | |
234 | SCM_DEFINE (scm_file_port_p, "file-port?", 1, 0, 0, | |
235 | (SCM obj), | |
2069af38 | 236 | "Determine whether @var{obj} is a port that is related to a file.") |
efa40607 DH |
237 | #define FUNC_NAME s_scm_file_port_p |
238 | { | |
239 | return SCM_BOOL (SCM_FPORTP (obj)); | |
240 | } | |
241 | #undef FUNC_NAME | |
242 | ||
243 | ||
0f2d19dd JB |
244 | /* scm_open_file |
245 | * Return a new port open on a given file. | |
246 | * | |
247 | * The mode string must match the pattern: [rwa+]** which | |
248 | * is interpreted in the usual unix way. | |
249 | * | |
250 | * Return the new port. | |
251 | */ | |
3b3b36dd | 252 | SCM_DEFINE (scm_open_file, "open-file", 2, 0, 0, |
1e6808ea MG |
253 | (SCM filename, SCM mode), |
254 | "Open the file whose name is @var{filename}, and return a port\n" | |
fc0d72d4 | 255 | "representing that file. The attributes of the port are\n" |
1e6808ea MG |
256 | "determined by the @var{mode} string. The way in which this is\n" |
257 | "interpreted is similar to C stdio. The first character must be\n" | |
258 | "one of the following:\n" | |
fc0d72d4 MD |
259 | "@table @samp\n" |
260 | "@item r\n" | |
261 | "Open an existing file for input.\n" | |
262 | "@item w\n" | |
263 | "Open a file for output, creating it if it doesn't already exist\n" | |
264 | "or removing its contents if it does.\n" | |
265 | "@item a\n" | |
1e6808ea MG |
266 | "Open a file for output, creating it if it doesn't already\n" |
267 | "exist. All writes to the port will go to the end of the file.\n" | |
fc0d72d4 MD |
268 | "The \"append mode\" can be turned off while the port is in use\n" |
269 | "@pxref{Ports and File Descriptors, fcntl}\n" | |
1e6808ea MG |
270 | "@end table\n" |
271 | "The following additional characters can be appended:\n" | |
fc0d72d4 MD |
272 | "@table @samp\n" |
273 | "@item +\n" | |
274 | "Open the port for both input and output. E.g., @code{r+}: open\n" | |
275 | "an existing file for both input and output.\n" | |
276 | "@item 0\n" | |
1e6808ea MG |
277 | "Create an \"unbuffered\" port. In this case input and output\n" |
278 | "operations are passed directly to the underlying port\n" | |
279 | "implementation without additional buffering. This is likely to\n" | |
280 | "slow down I/O operations. The buffering mode can be changed\n" | |
281 | "while a port is in use @pxref{Ports and File Descriptors,\n" | |
282 | "setvbuf}\n" | |
fc0d72d4 MD |
283 | "@item l\n" |
284 | "Add line-buffering to the port. The port output buffer will be\n" | |
285 | "automatically flushed whenever a newline character is written.\n" | |
1e6808ea MG |
286 | "@end table\n" |
287 | "In theory we could create read/write ports which were buffered\n" | |
288 | "in one direction only. However this isn't included in the\n" | |
289 | "current interfaces. If a file cannot be opened with the access\n" | |
290 | "requested, @code{open-file} throws an exception.") | |
1bbd0b84 | 291 | #define FUNC_NAME s_scm_open_file |
0f2d19dd | 292 | { |
19639113 | 293 | SCM port; |
cb63cf9e JB |
294 | int fdes; |
295 | int flags = 0; | |
19639113 | 296 | char *file; |
1e6808ea | 297 | char *md; |
cb63cf9e | 298 | char *ptr; |
19639113 | 299 | |
a6d9e5ab | 300 | SCM_VALIDATE_STRING (1, filename); |
1e6808ea | 301 | SCM_VALIDATE_STRING (2, mode); |
a6d9e5ab | 302 | SCM_STRING_COERCE_0TERMINATION_X (filename); |
1e6808ea | 303 | SCM_STRING_COERCE_0TERMINATION_X (mode); |
19639113 | 304 | |
a6d9e5ab | 305 | file = SCM_STRING_CHARS (filename); |
1e6808ea | 306 | md = SCM_STRING_CHARS (mode); |
19639113 | 307 | |
1e6808ea | 308 | switch (*md) |
0f2d19dd | 309 | { |
cb63cf9e JB |
310 | case 'r': |
311 | flags |= O_RDONLY; | |
312 | break; | |
313 | case 'w': | |
314 | flags |= O_WRONLY | O_CREAT | O_TRUNC; | |
315 | break; | |
316 | case 'a': | |
317 | flags |= O_WRONLY | O_CREAT | O_APPEND; | |
318 | break; | |
319 | default: | |
1e6808ea | 320 | scm_out_of_range (FUNC_NAME, mode); |
0f2d19dd | 321 | } |
1e6808ea | 322 | ptr = md + 1; |
cb63cf9e | 323 | while (*ptr != '\0') |
e145dd02 | 324 | { |
cb63cf9e JB |
325 | switch (*ptr) |
326 | { | |
327 | case '+': | |
328 | flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR; | |
329 | break; | |
9f561420 GH |
330 | case 'b': |
331 | #if defined (O_BINARY) | |
332 | flags |= O_BINARY; | |
333 | #endif | |
334 | break; | |
cb63cf9e | 335 | case '0': /* unbuffered: handled later. */ |
d3639214 | 336 | case 'l': /* line buffered: handled during output. */ |
cb63cf9e JB |
337 | break; |
338 | default: | |
1e6808ea | 339 | scm_out_of_range (FUNC_NAME, mode); |
cb63cf9e JB |
340 | } |
341 | ptr++; | |
e145dd02 | 342 | } |
cb63cf9e JB |
343 | SCM_SYSCALL (fdes = open (file, flags, 0666)); |
344 | if (fdes == -1) | |
e145dd02 | 345 | { |
cb63cf9e JB |
346 | int en = errno; |
347 | ||
5d2d2ffc | 348 | SCM_SYSERROR_MSG ("~A: ~S", |
cb63cf9e | 349 | scm_cons (scm_makfrom0str (strerror (en)), |
5d2d2ffc | 350 | scm_cons (filename, SCM_EOL)), en); |
0f2d19dd | 351 | } |
1e6808ea | 352 | port = scm_fdes_to_port (fdes, md, filename); |
0f2d19dd JB |
353 | return port; |
354 | } | |
1bbd0b84 | 355 | #undef FUNC_NAME |
0f2d19dd | 356 | |
e145dd02 | 357 | \f |
82893676 MG |
358 | #ifdef __MINGW32__ |
359 | /* | |
360 | * Try getting the appropiate file flags for a given file descriptor | |
361 | * under Windows. This incorporates some fancy operations because Windows | |
362 | * differentiates between file, pipe and socket descriptors. | |
363 | */ | |
364 | #ifndef O_ACCMODE | |
365 | # define O_ACCMODE 0x0003 | |
366 | #endif | |
367 | ||
368 | static int getflags (int fdes) | |
369 | { | |
370 | int flags = 0; | |
371 | struct stat buf; | |
372 | int error, optlen = sizeof (int); | |
373 | ||
374 | /* Is this a socket ? */ | |
375 | if (getsockopt (fdes, SOL_SOCKET, SO_ERROR, (void *) &error, &optlen) >= 0) | |
376 | flags = O_RDWR; | |
377 | /* Maybe a regular file ? */ | |
378 | else if (fstat (fdes, &buf) < 0) | |
379 | flags = -1; | |
380 | else | |
381 | { | |
382 | /* Or an anonymous pipe handle ? */ | |
383 | if (buf.st_mode & 0x1000 /* _O_SHORT_LIVED */) | |
384 | flags = O_RDWR; | |
385 | /* stdin ? */ | |
386 | else if (fdes == 0 && isatty (fdes)) | |
387 | flags = O_RDONLY; | |
388 | /* stdout / stderr ? */ | |
389 | else if ((fdes == 1 || fdes == 2) && isatty (fdes)) | |
390 | flags = O_WRONLY; | |
391 | else | |
392 | flags = buf.st_mode; | |
393 | } | |
394 | return flags; | |
395 | } | |
396 | #endif /* __MINGW32__ */ | |
397 | ||
cb63cf9e | 398 | /* Building Guile ports from a file descriptor. */ |
e145dd02 | 399 | |
cb63cf9e | 400 | /* Build a Scheme port from an open file descriptor `fdes'. |
a089567e JB |
401 | MODE indicates whether FILE is open for reading or writing; it uses |
402 | the same notation as open-file's second argument. | |
19b27fa2 GH |
403 | NAME is a string to be used as the port's filename. |
404 | */ | |
a089567e | 405 | SCM |
cb63cf9e | 406 | scm_fdes_to_port (int fdes, char *mode, SCM name) |
19b27fa2 | 407 | #define FUNC_NAME "scm_fdes_to_port" |
a089567e JB |
408 | { |
409 | long mode_bits = scm_mode_bits (mode); | |
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 JB |
429 | |
430 | SCM_NEWCELL (port); | |
431 | SCM_DEFER_INTS; | |
cb63cf9e JB |
432 | pt = scm_add_to_port_table (port); |
433 | SCM_SETPTAB_ENTRY (port, pt); | |
54778cd3 | 434 | SCM_SET_CELL_TYPE (port, (scm_tc16_fport | mode_bits)); |
cb63cf9e | 435 | |
a089567e | 436 | { |
92c2555f MV |
437 | scm_t_fport *fp |
438 | = (scm_t_fport *) scm_must_malloc (sizeof (scm_t_fport), | |
c6c79933 GH |
439 | FUNC_NAME); |
440 | ||
cb63cf9e | 441 | fp->fdes = fdes; |
0de97b83 | 442 | pt->rw_random = SCM_FDES_RANDOM_P (fdes); |
cb63cf9e JB |
443 | SCM_SETSTREAM (port, fp); |
444 | if (mode_bits & SCM_BUF0) | |
445 | scm_fport_buffer_add (port, 0, 0); | |
446 | else | |
447 | scm_fport_buffer_add (port, -1, -1); | |
a089567e | 448 | } |
b24b5e13 | 449 | SCM_SET_FILENAME (port, name); |
a089567e | 450 | SCM_ALLOW_INTS; |
e145dd02 JB |
451 | return port; |
452 | } | |
19b27fa2 | 453 | #undef FUNC_NAME |
e145dd02 | 454 | |
affc96b5 | 455 | /* Return a lower bound on the number of bytes available for input. */ |
cb63cf9e | 456 | static int |
affc96b5 | 457 | fport_input_waiting (SCM port) |
e145dd02 | 458 | { |
cb63cf9e JB |
459 | int fdes = SCM_FSTREAM (port)->fdes; |
460 | ||
461 | #ifdef HAVE_SELECT | |
462 | struct timeval timeout; | |
463 | SELECT_TYPE read_set; | |
464 | SELECT_TYPE write_set; | |
465 | SELECT_TYPE except_set; | |
466 | ||
467 | FD_ZERO (&read_set); | |
468 | FD_ZERO (&write_set); | |
469 | FD_ZERO (&except_set); | |
470 | ||
471 | FD_SET (fdes, &read_set); | |
472 | ||
473 | timeout.tv_sec = 0; | |
474 | timeout.tv_usec = 0; | |
475 | ||
476 | if (select (SELECT_SET_SIZE, | |
477 | &read_set, &write_set, &except_set, &timeout) | |
478 | < 0) | |
affc96b5 GH |
479 | scm_syserror ("fport_input_waiting"); |
480 | return FD_ISSET (fdes, &read_set) ? 1 : 0; | |
cb63cf9e JB |
481 | #elif defined (FIONREAD) |
482 | int remir; | |
483 | ioctl(fdes, FIONREAD, &remir); | |
484 | return remir; | |
485 | #else | |
affc96b5 | 486 | scm_misc_error ("fport_input_waiting", |
cb63cf9e JB |
487 | "Not fully implemented on this platform", |
488 | SCM_EOL); | |
489 | #endif | |
a089567e JB |
490 | } |
491 | ||
cb63cf9e | 492 | \f |
0f2d19dd | 493 | static int |
e81d98ec | 494 | fport_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) |
0f2d19dd | 495 | { |
b3ec3c64 MD |
496 | scm_puts ("#<", port); |
497 | scm_print_port_mode (exp, port); | |
498 | if (SCM_OPFPORTP (exp)) | |
0f2d19dd | 499 | { |
b3ec3c64 | 500 | int fdes; |
b24b5e13 DH |
501 | SCM name = SCM_FILENAME (exp); |
502 | if (SCM_STRINGP (name) || SCM_SYMBOLP (name)) | |
503 | scm_display (name, port); | |
504 | else | |
505 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); | |
b3ec3c64 MD |
506 | scm_putc (' ', port); |
507 | fdes = (SCM_FSTREAM (exp))->fdes; | |
508 | ||
82893676 | 509 | #ifdef HAVE_TTYNAME |
b3ec3c64 MD |
510 | if (isatty (fdes)) |
511 | scm_puts (ttyname (fdes), port); | |
512 | else | |
82893676 | 513 | #endif /* HAVE_TTYNAME */ |
b3ec3c64 | 514 | scm_intprint (fdes, 10, port); |
0f2d19dd JB |
515 | } |
516 | else | |
517 | { | |
b3ec3c64 MD |
518 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); |
519 | scm_putc (' ', port); | |
f1267706 | 520 | scm_intprint (SCM_UNPACK (SCM_CDR (exp)), 16, port); |
0f2d19dd | 521 | } |
b3ec3c64 MD |
522 | scm_putc ('>', port); |
523 | return 1; | |
0f2d19dd JB |
524 | } |
525 | ||
cb63cf9e JB |
526 | #ifdef GUILE_ISELECT |
527 | /* thread-local block for input on fport's fdes. */ | |
528 | static void | |
529 | fport_wait_for_input (SCM port) | |
3cb988bd | 530 | { |
cb63cf9e | 531 | int fdes = SCM_FSTREAM (port)->fdes; |
3cb988bd | 532 | |
affc96b5 | 533 | if (!fport_input_waiting (port)) |
8122b543 | 534 | { |
cb63cf9e JB |
535 | int n; |
536 | SELECT_TYPE readfds; | |
537 | int flags = fcntl (fdes, F_GETFL); | |
538 | ||
539 | if (flags == -1) | |
540 | scm_syserror ("scm_fdes_wait_for_input"); | |
541 | if (!(flags & O_NONBLOCK)) | |
542 | do | |
543 | { | |
544 | FD_ZERO (&readfds); | |
545 | FD_SET (fdes, &readfds); | |
546 | n = scm_internal_select (fdes + 1, &readfds, NULL, NULL, NULL); | |
547 | } | |
548 | while (n == -1 && errno == EINTR); | |
8122b543 | 549 | } |
3cb988bd | 550 | } |
0f2d19dd JB |
551 | #endif |
552 | ||
affc96b5 | 553 | static void fport_flush (SCM port); |
0f2d19dd | 554 | |
c2da2648 GH |
555 | /* fill a port's read-buffer with a single read. returns the first |
556 | char or EOF if end of file. */ | |
0f2d19dd | 557 | static int |
affc96b5 | 558 | fport_fill_input (SCM port) |
0f2d19dd | 559 | { |
c014a02e | 560 | long count; |
92c2555f MV |
561 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
562 | scm_t_fport *fp = SCM_FSTREAM (port); | |
cb63cf9e | 563 | |
cb63cf9e JB |
564 | #ifdef GUILE_ISELECT |
565 | fport_wait_for_input (port); | |
566 | #endif | |
567 | SCM_SYSCALL (count = read (fp->fdes, pt->read_buf, pt->read_buf_size)); | |
568 | if (count == -1) | |
affc96b5 | 569 | scm_syserror ("fport_fill_input"); |
cb63cf9e JB |
570 | if (count == 0) |
571 | return EOF; | |
572 | else | |
573 | { | |
5c070ca7 | 574 | pt->read_pos = pt->read_buf; |
cb63cf9e | 575 | pt->read_end = pt->read_buf + count; |
5c070ca7 | 576 | return *pt->read_buf; |
cb63cf9e | 577 | } |
0f2d19dd JB |
578 | } |
579 | ||
cb63cf9e | 580 | static off_t |
affc96b5 | 581 | fport_seek (SCM port, off_t offset, int whence) |
0f2d19dd | 582 | { |
92c2555f MV |
583 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
584 | scm_t_fport *fp = SCM_FSTREAM (port); | |
7dcb364d GH |
585 | off_t rv; |
586 | off_t result; | |
587 | ||
588 | if (pt->rw_active == SCM_PORT_WRITE) | |
589 | { | |
590 | if (offset != 0 || whence != SEEK_CUR) | |
591 | { | |
592 | fport_flush (port); | |
593 | result = rv = lseek (fp->fdes, offset, whence); | |
594 | } | |
595 | else | |
596 | { | |
597 | /* read current position without disturbing the buffer. */ | |
598 | rv = lseek (fp->fdes, offset, whence); | |
599 | result = rv + (pt->write_pos - pt->write_buf); | |
600 | } | |
601 | } | |
602 | else if (pt->rw_active == SCM_PORT_READ) | |
603 | { | |
604 | if (offset != 0 || whence != SEEK_CUR) | |
605 | { | |
606 | /* could expand to avoid a second seek. */ | |
607 | scm_end_input (port); | |
608 | result = rv = lseek (fp->fdes, offset, whence); | |
609 | } | |
610 | else | |
611 | { | |
612 | /* read current position without disturbing the buffer | |
613 | (particularly the unread-char buffer). */ | |
614 | rv = lseek (fp->fdes, offset, whence); | |
615 | result = rv - (pt->read_end - pt->read_pos); | |
616 | ||
617 | if (pt->read_buf == pt->putback_buf) | |
618 | result -= pt->saved_read_end - pt->saved_read_pos; | |
619 | } | |
620 | } | |
621 | else /* SCM_PORT_NEITHER */ | |
622 | { | |
623 | result = rv = lseek (fp->fdes, offset, whence); | |
624 | } | |
cb8dfa3f | 625 | |
7dcb364d | 626 | if (rv == -1) |
affc96b5 | 627 | scm_syserror ("fport_seek"); |
7dcb364d | 628 | |
cb8dfa3f | 629 | return result; |
0f2d19dd JB |
630 | } |
631 | ||
840ae05d | 632 | static void |
affc96b5 | 633 | fport_truncate (SCM port, off_t length) |
840ae05d | 634 | { |
92c2555f | 635 | scm_t_fport *fp = SCM_FSTREAM (port); |
840ae05d JB |
636 | |
637 | if (ftruncate (fp->fdes, length) == -1) | |
638 | scm_syserror ("ftruncate"); | |
639 | } | |
640 | ||
0c6d2191 GH |
641 | /* helper for fport_write: try to write data, using multiple system |
642 | calls if required. */ | |
643 | #define FUNC_NAME "write_all" | |
644 | static void write_all (SCM port, const void *data, size_t remaining) | |
645 | { | |
646 | int fdes = SCM_FSTREAM (port)->fdes; | |
647 | ||
648 | while (remaining > 0) | |
649 | { | |
82893676 | 650 | size_t done; |
0c6d2191 GH |
651 | |
652 | SCM_SYSCALL (done = write (fdes, data, remaining)); | |
653 | ||
654 | if (done == -1) | |
655 | SCM_SYSERROR; | |
656 | remaining -= done; | |
657 | data = ((const char *) data) + done; | |
658 | } | |
659 | } | |
660 | #undef FUNC_NAME | |
661 | ||
31703ab8 | 662 | static void |
8aa011a1 | 663 | fport_write (SCM port, const void *data, size_t size) |
31703ab8 | 664 | { |
0c6d2191 | 665 | /* this procedure tries to minimize the number of writes/flushes. */ |
92c2555f | 666 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
31703ab8 | 667 | |
0c6d2191 GH |
668 | if (pt->write_buf == &pt->shortbuf |
669 | || (pt->write_pos == pt->write_buf && size >= pt->write_buf_size)) | |
31703ab8 | 670 | { |
0c6d2191 GH |
671 | /* "unbuffered" port, or |
672 | port with empty buffer and data won't fit in buffer. */ | |
673 | write_all (port, data, size); | |
674 | return; | |
31703ab8 | 675 | } |
d3639214 | 676 | |
0c6d2191 GH |
677 | { |
678 | off_t space = pt->write_end - pt->write_pos; | |
679 | ||
680 | if (size <= space) | |
681 | { | |
682 | /* data fits in buffer. */ | |
683 | memcpy (pt->write_pos, data, size); | |
684 | pt->write_pos += size; | |
685 | if (pt->write_pos == pt->write_end) | |
686 | { | |
affc96b5 | 687 | fport_flush (port); |
0c6d2191 GH |
688 | /* we can skip the line-buffering check if nothing's buffered. */ |
689 | return; | |
690 | } | |
691 | } | |
692 | else | |
693 | { | |
694 | memcpy (pt->write_pos, data, space); | |
695 | pt->write_pos = pt->write_end; | |
696 | fport_flush (port); | |
697 | { | |
698 | const void *ptr = ((const char *) data) + space; | |
699 | size_t remaining = size - space; | |
700 | ||
701 | if (size >= pt->write_buf_size) | |
702 | { | |
703 | write_all (port, ptr, remaining); | |
704 | return; | |
705 | } | |
706 | else | |
707 | { | |
708 | memcpy (pt->write_pos, ptr, remaining); | |
709 | pt->write_pos += remaining; | |
710 | } | |
31703ab8 | 711 | } |
0c6d2191 | 712 | } |
31703ab8 | 713 | |
0c6d2191 GH |
714 | /* handle line buffering. */ |
715 | if ((SCM_CELL_WORD_0 (port) & SCM_BUFLINE) && memchr (data, '\n', size)) | |
716 | fport_flush (port); | |
717 | } | |
31703ab8 GH |
718 | } |
719 | ||
720 | /* becomes 1 when process is exiting: normal exception handling won't | |
721 | work by this time. */ | |
cb63cf9e | 722 | extern int terminating; |
0f2d19dd | 723 | |
cb63cf9e | 724 | static void |
affc96b5 | 725 | fport_flush (SCM port) |
0f2d19dd | 726 | { |
92c2555f MV |
727 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
728 | scm_t_fport *fp = SCM_FSTREAM (port); | |
6f760c1d | 729 | unsigned char *ptr = pt->write_buf; |
c014a02e ML |
730 | long init_size = pt->write_pos - pt->write_buf; |
731 | long remaining = init_size; | |
0f2d19dd | 732 | |
cb63cf9e JB |
733 | while (remaining > 0) |
734 | { | |
c014a02e | 735 | long count; |
cb63cf9e JB |
736 | |
737 | SCM_SYSCALL (count = write (fp->fdes, ptr, remaining)); | |
738 | if (count < 0) | |
739 | { | |
740 | /* error. assume nothing was written this call, but | |
741 | fix up the buffer for any previous successful writes. */ | |
c014a02e | 742 | long done = init_size - remaining; |
cb63cf9e JB |
743 | |
744 | if (done > 0) | |
745 | { | |
746 | int i; | |
747 | ||
748 | for (i = 0; i < remaining; i++) | |
749 | { | |
750 | *(pt->write_buf + i) = *(pt->write_buf + done + i); | |
751 | } | |
752 | pt->write_pos = pt->write_buf + remaining; | |
753 | } | |
6b72ac1d | 754 | if (terminating) |
cb63cf9e JB |
755 | { |
756 | const char *msg = "Error: could not flush file-descriptor "; | |
757 | char buf[11]; | |
758 | ||
759 | write (2, msg, strlen (msg)); | |
760 | sprintf (buf, "%d\n", fp->fdes); | |
761 | write (2, buf, strlen (buf)); | |
762 | ||
763 | count = remaining; | |
764 | } | |
6b72ac1d GH |
765 | else if (scm_gc_running_p) |
766 | { | |
767 | /* silently ignore the error. scm_error would abort if we | |
768 | called it now. */ | |
769 | count = remaining; | |
770 | } | |
771 | else | |
772 | scm_syserror ("fport_flush"); | |
cb63cf9e JB |
773 | } |
774 | ptr += count; | |
775 | remaining -= count; | |
776 | } | |
777 | pt->write_pos = pt->write_buf; | |
61e452ba | 778 | pt->rw_active = SCM_PORT_NEITHER; |
840ae05d JB |
779 | } |
780 | ||
283a1a0e | 781 | /* clear the read buffer and adjust the file position for unread bytes. */ |
840ae05d | 782 | static void |
affc96b5 | 783 | fport_end_input (SCM port, int offset) |
840ae05d | 784 | { |
92c2555f MV |
785 | scm_t_fport *fp = SCM_FSTREAM (port); |
786 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
283a1a0e GH |
787 | |
788 | offset += pt->read_end - pt->read_pos; | |
840ae05d | 789 | |
840ae05d JB |
790 | if (offset > 0) |
791 | { | |
792 | pt->read_pos = pt->read_end; | |
793 | /* will throw error if unread-char used at beginning of file | |
794 | then attempting to write. seems correct. */ | |
795 | if (lseek (fp->fdes, -offset, SEEK_CUR) == -1) | |
affc96b5 | 796 | scm_syserror ("fport_end_input"); |
840ae05d | 797 | } |
61e452ba | 798 | pt->rw_active = SCM_PORT_NEITHER; |
8f29fbd0 JB |
799 | } |
800 | ||
6a2c4c81 | 801 | static int |
affc96b5 | 802 | fport_close (SCM port) |
6a2c4c81 | 803 | { |
92c2555f MV |
804 | scm_t_fport *fp = SCM_FSTREAM (port); |
805 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
cb63cf9e | 806 | int rv; |
840ae05d | 807 | |
affc96b5 | 808 | fport_flush (port); |
cb63cf9e JB |
809 | SCM_SYSCALL (rv = close (fp->fdes)); |
810 | if (rv == -1 && errno != EBADF) | |
6b72ac1d GH |
811 | { |
812 | if (scm_gc_running_p) | |
813 | /* silently ignore the error. scm_error would abort if we | |
814 | called it now. */ | |
815 | ; | |
816 | else | |
817 | scm_syserror ("fport_close"); | |
818 | } | |
6c951427 GH |
819 | if (pt->read_buf == pt->putback_buf) |
820 | pt->read_buf = pt->saved_read_buf; | |
cb63cf9e | 821 | if (pt->read_buf != &pt->shortbuf) |
c6c79933 | 822 | scm_must_free (pt->read_buf); |
cb63cf9e | 823 | if (pt->write_buf != &pt->shortbuf) |
c6c79933 GH |
824 | scm_must_free (pt->write_buf); |
825 | scm_must_free ((char *) fp); | |
cb63cf9e | 826 | return rv; |
6a2c4c81 JB |
827 | } |
828 | ||
1be6b49c | 829 | static size_t |
affc96b5 | 830 | fport_free (SCM port) |
b3ec3c64 | 831 | { |
affc96b5 | 832 | fport_close (port); |
b3ec3c64 MD |
833 | return 0; |
834 | } | |
835 | ||
92c2555f | 836 | static scm_t_bits |
b3ec3c64 MD |
837 | scm_make_fptob () |
838 | { | |
92c2555f | 839 | scm_t_bits tc = scm_make_port_type ("file", fport_fill_input, fport_write); |
a98bddfd | 840 | |
affc96b5 | 841 | scm_set_port_free (tc, fport_free); |
e841c3e0 | 842 | scm_set_port_print (tc, fport_print); |
affc96b5 GH |
843 | scm_set_port_flush (tc, fport_flush); |
844 | scm_set_port_end_input (tc, fport_end_input); | |
845 | scm_set_port_close (tc, fport_close); | |
846 | scm_set_port_seek (tc, fport_seek); | |
847 | scm_set_port_truncate (tc, fport_truncate); | |
848 | scm_set_port_input_waiting (tc, fport_input_waiting); | |
a98bddfd DH |
849 | |
850 | return tc; | |
b3ec3c64 | 851 | } |
0f2d19dd | 852 | |
0f2d19dd JB |
853 | void |
854 | scm_init_fports () | |
0f2d19dd | 855 | { |
a98bddfd DH |
856 | scm_tc16_fport = scm_make_fptob (); |
857 | ||
86d31dfe MV |
858 | scm_c_define ("_IOFBF", SCM_MAKINUM (_IOFBF)); |
859 | scm_c_define ("_IOLBF", SCM_MAKINUM (_IOLBF)); | |
860 | scm_c_define ("_IONBF", SCM_MAKINUM (_IONBF)); | |
a98bddfd DH |
861 | |
862 | #ifndef SCM_MAGIC_SNARFER | |
863 | #include "libguile/fports.x" | |
864 | #endif | |
0f2d19dd | 865 | } |
89e00824 ML |
866 | |
867 | /* | |
868 | Local Variables: | |
869 | c-file-style: "gnu" | |
870 | End: | |
871 | */ |