Commit | Line | Data |
---|---|---|
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 |
f47a5239 | 62 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
cb63cf9e JB |
63 | #include <sys/stat.h> |
64 | #endif | |
0f2d19dd | 65 | |
cb63cf9e | 66 | #include <errno.h> |
e145dd02 | 67 | |
a0599745 | 68 | #include "libguile/iselect.h" |
82893676 MG |
69 | /* Some defines for Windows. */ |
70 | #ifdef __MINGW32__ | |
71 | # include <sys/stat.h> | |
72 | # include <winsock2.h> | |
73 | # define ftruncate(fd, size) chsize (fd, size) | |
74 | #endif /* __MINGW32__ */ | |
cb63cf9e | 75 | |
a98bddfd | 76 | |
92c2555f | 77 | scm_t_bits scm_tc16_fport; |
a98bddfd DH |
78 | |
79 | ||
19b27fa2 | 80 | /* default buffer size, used if the O/S won't supply a value. */ |
1be6b49c | 81 | static const size_t default_buffer_size = 1024; |
19b27fa2 | 82 | |
cb63cf9e JB |
83 | /* create FPORT buffer with specified sizes (or -1 to use default size or |
84 | 0 for no buffer. */ | |
85 | static void | |
c014a02e | 86 | scm_fport_buffer_add (SCM port, long read_size, int write_size) |
c6c79933 | 87 | #define FUNC_NAME "scm_fport_buffer_add" |
e145dd02 | 88 | { |
92c2555f MV |
89 | scm_t_fport *fp = SCM_FSTREAM (port); |
90 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
e145dd02 | 91 | |
cb63cf9e JB |
92 | if (read_size == -1 || write_size == -1) |
93 | { | |
1be6b49c | 94 | size_t default_size; |
f47a5239 | 95 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
cb63cf9e JB |
96 | struct stat st; |
97 | ||
19b27fa2 GH |
98 | default_size = (fstat (fp->fdes, &st) == -1) ? default_buffer_size |
99 | : st.st_blksize; | |
cb63cf9e | 100 | #else |
19b27fa2 | 101 | default_size = default_buffer_size; |
cb63cf9e JB |
102 | #endif |
103 | if (read_size == -1) | |
104 | read_size = default_size; | |
105 | if (write_size == -1) | |
106 | write_size = default_size; | |
107 | } | |
0f2d19dd | 108 | |
f5f2dcff | 109 | if (SCM_INPUT_PORT_P (port) && read_size > 0) |
cb63cf9e | 110 | { |
c6c79933 | 111 | pt->read_buf = scm_must_malloc (read_size, FUNC_NAME); |
cb63cf9e JB |
112 | pt->read_pos = pt->read_end = pt->read_buf; |
113 | pt->read_buf_size = read_size; | |
114 | } | |
115 | else | |
116 | { | |
840ae05d | 117 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; |
cb63cf9e JB |
118 | pt->read_buf_size = 1; |
119 | } | |
1717856b | 120 | |
f5f2dcff | 121 | if (SCM_OUTPUT_PORT_P (port) && write_size > 0) |
cb63cf9e | 122 | { |
c6c79933 | 123 | pt->write_buf = scm_must_malloc (write_size, FUNC_NAME); |
cb63cf9e JB |
124 | pt->write_pos = pt->write_buf; |
125 | pt->write_buf_size = write_size; | |
126 | } | |
127 | else | |
128 | { | |
129 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
130 | pt->write_buf_size = 1; | |
131 | } | |
132 | ||
133 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
134 | if (read_size > 0 || write_size > 0) | |
54778cd3 | 135 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0); |
cb63cf9e | 136 | else |
54778cd3 | 137 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUF0); |
7a6f1ffa | 138 | } |
c6c79933 | 139 | #undef FUNC_NAME |
7a6f1ffa | 140 | |
a1ec6916 | 141 | SCM_DEFINE (scm_setvbuf, "setvbuf", 2, 1, 0, |
1bbd0b84 | 142 | (SCM port, SCM mode, SCM size), |
fc0d72d4 MD |
143 | "Set the buffering mode for @var{port}. @var{mode} can be:\n" |
144 | "@table @code\n" | |
145 | "@item _IONBF\n" | |
146 | "non-buffered\n" | |
147 | "@item _IOLBF\n" | |
148 | "line buffered\n" | |
149 | "@item _IOFBF\n" | |
150 | "block buffered, using a newly allocated buffer of @var{size} bytes.\n" | |
151 | "If @var{size} is omitted, a default size will be used.\n" | |
2c1ae20e | 152 | "@end table") |
1bbd0b84 | 153 | #define FUNC_NAME s_scm_setvbuf |
7a6f1ffa | 154 | { |
1be6b49c | 155 | int cmode; |
c014a02e | 156 | long csize; |
92c2555f | 157 | scm_t_port *pt; |
7a6f1ffa | 158 | |
78446828 MV |
159 | port = SCM_COERCE_OUTPORT (port); |
160 | ||
3b3b36dd GB |
161 | SCM_VALIDATE_OPFPORT (1,port); |
162 | SCM_VALIDATE_INUM_COPY (2,mode,cmode); | |
d3639214 | 163 | if (cmode != _IONBF && cmode != _IOFBF && cmode != _IOLBF) |
1bbd0b84 | 164 | scm_out_of_range (FUNC_NAME, mode); |
d3639214 GH |
165 | |
166 | if (cmode == _IOLBF) | |
167 | { | |
54778cd3 | 168 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUFLINE); |
d3639214 GH |
169 | cmode = _IOFBF; |
170 | } | |
171 | else | |
172 | { | |
54778cd3 | 173 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) ^ SCM_BUFLINE); |
d3639214 GH |
174 | } |
175 | ||
7a6f1ffa | 176 | if (SCM_UNBNDP (size)) |
cb63cf9e JB |
177 | { |
178 | if (cmode == _IOFBF) | |
179 | csize = -1; | |
180 | else | |
181 | csize = 0; | |
182 | } | |
7a6f1ffa GH |
183 | else |
184 | { | |
3b3b36dd | 185 | SCM_VALIDATE_INUM_COPY (3,size,csize); |
cb63cf9e | 186 | if (csize < 0 || (cmode == _IONBF && csize > 0)) |
1bbd0b84 | 187 | scm_out_of_range (FUNC_NAME, size); |
7a6f1ffa | 188 | } |
d3639214 | 189 | |
cb63cf9e | 190 | pt = SCM_PTAB_ENTRY (port); |
7a6f1ffa | 191 | |
cb63cf9e JB |
192 | /* silently discards buffered chars. */ |
193 | if (pt->read_buf != &pt->shortbuf) | |
c6c79933 | 194 | scm_must_free (pt->read_buf); |
cb63cf9e | 195 | if (pt->write_buf != &pt->shortbuf) |
c6c79933 | 196 | scm_must_free (pt->write_buf); |
7a6f1ffa | 197 | |
cb63cf9e JB |
198 | scm_fport_buffer_add (port, csize, csize); |
199 | return SCM_UNSPECIFIED; | |
0f2d19dd | 200 | } |
1bbd0b84 | 201 | #undef FUNC_NAME |
0f2d19dd | 202 | |
eadd48de GH |
203 | /* Move ports with the specified file descriptor to new descriptors, |
204 | * reseting the revealed count to 0. | |
0f2d19dd | 205 | */ |
1717856b | 206 | |
eadd48de | 207 | void |
6e8d25a6 | 208 | scm_evict_ports (int fd) |
0f2d19dd | 209 | { |
c014a02e | 210 | long i; |
0f2d19dd | 211 | |
f5fd8aa2 | 212 | for (i = 0; i < scm_port_table_size; i++) |
eadd48de | 213 | { |
f5fd8aa2 | 214 | SCM port = scm_port_table[i]->port; |
cb63cf9e JB |
215 | |
216 | if (SCM_FPORTP (port)) | |
eadd48de | 217 | { |
92c2555f | 218 | scm_t_fport *fp = SCM_FSTREAM (port); |
cb63cf9e JB |
219 | |
220 | if (fp->fdes == fd) | |
221 | { | |
222 | fp->fdes = dup (fd); | |
223 | if (fp->fdes == -1) | |
224 | scm_syserror ("scm_evict_ports"); | |
225 | scm_set_port_revealed_x (port, SCM_MAKINUM (0)); | |
226 | } | |
eadd48de GH |
227 | } |
228 | } | |
229 | } | |
0f2d19dd | 230 | |
efa40607 DH |
231 | |
232 | SCM_DEFINE (scm_file_port_p, "file-port?", 1, 0, 0, | |
233 | (SCM obj), | |
2069af38 | 234 | "Determine whether @var{obj} is a port that is related to a file.") |
efa40607 DH |
235 | #define FUNC_NAME s_scm_file_port_p |
236 | { | |
237 | return SCM_BOOL (SCM_FPORTP (obj)); | |
238 | } | |
239 | #undef FUNC_NAME | |
240 | ||
241 | ||
0f2d19dd JB |
242 | /* scm_open_file |
243 | * Return a new port open on a given file. | |
244 | * | |
245 | * The mode string must match the pattern: [rwa+]** which | |
246 | * is interpreted in the usual unix way. | |
247 | * | |
248 | * Return the new port. | |
249 | */ | |
3b3b36dd | 250 | SCM_DEFINE (scm_open_file, "open-file", 2, 0, 0, |
1e6808ea MG |
251 | (SCM filename, SCM mode), |
252 | "Open the file whose name is @var{filename}, and return a port\n" | |
fc0d72d4 | 253 | "representing that file. The attributes of the port are\n" |
1e6808ea MG |
254 | "determined by the @var{mode} string. The way in which this is\n" |
255 | "interpreted is similar to C stdio. The first character must be\n" | |
256 | "one of the following:\n" | |
fc0d72d4 MD |
257 | "@table @samp\n" |
258 | "@item r\n" | |
259 | "Open an existing file for input.\n" | |
260 | "@item w\n" | |
261 | "Open a file for output, creating it if it doesn't already exist\n" | |
262 | "or removing its contents if it does.\n" | |
263 | "@item a\n" | |
1e6808ea MG |
264 | "Open a file for output, creating it if it doesn't already\n" |
265 | "exist. All writes to the port will go to the end of the file.\n" | |
fc0d72d4 MD |
266 | "The \"append mode\" can be turned off while the port is in use\n" |
267 | "@pxref{Ports and File Descriptors, fcntl}\n" | |
1e6808ea MG |
268 | "@end table\n" |
269 | "The following additional characters can be appended:\n" | |
fc0d72d4 MD |
270 | "@table @samp\n" |
271 | "@item +\n" | |
272 | "Open the port for both input and output. E.g., @code{r+}: open\n" | |
273 | "an existing file for both input and output.\n" | |
274 | "@item 0\n" | |
1e6808ea MG |
275 | "Create an \"unbuffered\" port. In this case input and output\n" |
276 | "operations are passed directly to the underlying port\n" | |
277 | "implementation without additional buffering. This is likely to\n" | |
278 | "slow down I/O operations. The buffering mode can be changed\n" | |
279 | "while a port is in use @pxref{Ports and File Descriptors,\n" | |
280 | "setvbuf}\n" | |
fc0d72d4 MD |
281 | "@item l\n" |
282 | "Add line-buffering to the port. The port output buffer will be\n" | |
283 | "automatically flushed whenever a newline character is written.\n" | |
1e6808ea MG |
284 | "@end table\n" |
285 | "In theory we could create read/write ports which were buffered\n" | |
286 | "in one direction only. However this isn't included in the\n" | |
287 | "current interfaces. If a file cannot be opened with the access\n" | |
288 | "requested, @code{open-file} throws an exception.") | |
1bbd0b84 | 289 | #define FUNC_NAME s_scm_open_file |
0f2d19dd | 290 | { |
19639113 | 291 | SCM port; |
cb63cf9e JB |
292 | int fdes; |
293 | int flags = 0; | |
19639113 | 294 | char *file; |
1e6808ea | 295 | char *md; |
cb63cf9e | 296 | char *ptr; |
19639113 | 297 | |
a6d9e5ab | 298 | SCM_VALIDATE_STRING (1, filename); |
1e6808ea | 299 | SCM_VALIDATE_STRING (2, mode); |
19639113 | 300 | |
a6d9e5ab | 301 | file = SCM_STRING_CHARS (filename); |
1e6808ea | 302 | md = SCM_STRING_CHARS (mode); |
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", |
cb63cf9e | 345 | scm_cons (scm_makfrom0str (strerror (en)), |
5d2d2ffc | 346 | scm_cons (filename, SCM_EOL)), en); |
0f2d19dd | 347 | } |
1e6808ea | 348 | port = scm_fdes_to_port (fdes, md, filename); |
0f2d19dd JB |
349 | return port; |
350 | } | |
1bbd0b84 | 351 | #undef FUNC_NAME |
0f2d19dd | 352 | |
e145dd02 | 353 | \f |
82893676 MG |
354 | #ifdef __MINGW32__ |
355 | /* | |
356 | * Try getting the appropiate file flags for a given file descriptor | |
357 | * under Windows. This incorporates some fancy operations because Windows | |
358 | * differentiates between file, pipe and socket descriptors. | |
359 | */ | |
360 | #ifndef O_ACCMODE | |
361 | # define O_ACCMODE 0x0003 | |
362 | #endif | |
363 | ||
364 | static int getflags (int fdes) | |
365 | { | |
366 | int flags = 0; | |
367 | struct stat buf; | |
368 | int error, optlen = sizeof (int); | |
369 | ||
370 | /* Is this a socket ? */ | |
371 | if (getsockopt (fdes, SOL_SOCKET, SO_ERROR, (void *) &error, &optlen) >= 0) | |
372 | flags = O_RDWR; | |
373 | /* Maybe a regular file ? */ | |
374 | else if (fstat (fdes, &buf) < 0) | |
375 | flags = -1; | |
376 | else | |
377 | { | |
378 | /* Or an anonymous pipe handle ? */ | |
379 | if (buf.st_mode & 0x1000 /* _O_SHORT_LIVED */) | |
380 | flags = O_RDWR; | |
381 | /* stdin ? */ | |
382 | else if (fdes == 0 && isatty (fdes)) | |
383 | flags = O_RDONLY; | |
384 | /* stdout / stderr ? */ | |
385 | else if ((fdes == 1 || fdes == 2) && isatty (fdes)) | |
386 | flags = O_WRONLY; | |
387 | else | |
388 | flags = buf.st_mode; | |
389 | } | |
390 | return flags; | |
391 | } | |
392 | #endif /* __MINGW32__ */ | |
393 | ||
cb63cf9e | 394 | /* Building Guile ports from a file descriptor. */ |
e145dd02 | 395 | |
cb63cf9e | 396 | /* Build a Scheme port from an open file descriptor `fdes'. |
a089567e JB |
397 | MODE indicates whether FILE is open for reading or writing; it uses |
398 | the same notation as open-file's second argument. | |
19b27fa2 GH |
399 | NAME is a string to be used as the port's filename. |
400 | */ | |
a089567e | 401 | SCM |
cb63cf9e | 402 | scm_fdes_to_port (int fdes, char *mode, SCM name) |
19b27fa2 | 403 | #define FUNC_NAME "scm_fdes_to_port" |
a089567e JB |
404 | { |
405 | long mode_bits = scm_mode_bits (mode); | |
406 | SCM port; | |
92c2555f | 407 | scm_t_port *pt; |
19b27fa2 GH |
408 | int flags; |
409 | ||
410 | /* test that fdes is valid. */ | |
82893676 MG |
411 | #ifdef __MINGW32__ |
412 | flags = getflags (fdes); | |
413 | #else | |
19b27fa2 | 414 | flags = fcntl (fdes, F_GETFL, 0); |
82893676 | 415 | #endif |
19b27fa2 GH |
416 | if (flags == -1) |
417 | SCM_SYSERROR; | |
418 | flags &= O_ACCMODE; | |
419 | if (flags != O_RDWR | |
420 | && ((flags != O_WRONLY && (mode_bits & SCM_WRTNG)) | |
421 | || (flags != O_RDONLY && (mode_bits & SCM_RDNG)))) | |
422 | { | |
423 | SCM_MISC_ERROR ("requested file mode not available on fdes", SCM_EOL); | |
424 | } | |
a089567e JB |
425 | |
426 | SCM_NEWCELL (port); | |
427 | SCM_DEFER_INTS; | |
cb63cf9e JB |
428 | pt = scm_add_to_port_table (port); |
429 | SCM_SETPTAB_ENTRY (port, pt); | |
54778cd3 | 430 | SCM_SET_CELL_TYPE (port, (scm_tc16_fport | mode_bits)); |
cb63cf9e | 431 | |
a089567e | 432 | { |
92c2555f MV |
433 | scm_t_fport *fp |
434 | = (scm_t_fport *) scm_must_malloc (sizeof (scm_t_fport), | |
c6c79933 GH |
435 | FUNC_NAME); |
436 | ||
cb63cf9e | 437 | fp->fdes = fdes; |
0de97b83 | 438 | pt->rw_random = SCM_FDES_RANDOM_P (fdes); |
cb63cf9e JB |
439 | SCM_SETSTREAM (port, fp); |
440 | if (mode_bits & SCM_BUF0) | |
441 | scm_fport_buffer_add (port, 0, 0); | |
442 | else | |
443 | scm_fport_buffer_add (port, -1, -1); | |
a089567e | 444 | } |
b24b5e13 | 445 | SCM_SET_FILENAME (port, name); |
a089567e | 446 | SCM_ALLOW_INTS; |
e145dd02 JB |
447 | return port; |
448 | } | |
19b27fa2 | 449 | #undef FUNC_NAME |
e145dd02 | 450 | |
affc96b5 | 451 | /* Return a lower bound on the number of bytes available for input. */ |
cb63cf9e | 452 | static int |
affc96b5 | 453 | fport_input_waiting (SCM port) |
e145dd02 | 454 | { |
cb63cf9e JB |
455 | int fdes = SCM_FSTREAM (port)->fdes; |
456 | ||
457 | #ifdef HAVE_SELECT | |
458 | struct timeval timeout; | |
459 | SELECT_TYPE read_set; | |
460 | SELECT_TYPE write_set; | |
461 | SELECT_TYPE except_set; | |
462 | ||
463 | FD_ZERO (&read_set); | |
464 | FD_ZERO (&write_set); | |
465 | FD_ZERO (&except_set); | |
466 | ||
467 | FD_SET (fdes, &read_set); | |
468 | ||
469 | timeout.tv_sec = 0; | |
470 | timeout.tv_usec = 0; | |
471 | ||
472 | if (select (SELECT_SET_SIZE, | |
473 | &read_set, &write_set, &except_set, &timeout) | |
474 | < 0) | |
affc96b5 GH |
475 | scm_syserror ("fport_input_waiting"); |
476 | return FD_ISSET (fdes, &read_set) ? 1 : 0; | |
cb63cf9e JB |
477 | #elif defined (FIONREAD) |
478 | int remir; | |
479 | ioctl(fdes, FIONREAD, &remir); | |
480 | return remir; | |
481 | #else | |
affc96b5 | 482 | scm_misc_error ("fport_input_waiting", |
cb63cf9e JB |
483 | "Not fully implemented on this platform", |
484 | SCM_EOL); | |
485 | #endif | |
a089567e JB |
486 | } |
487 | ||
cb63cf9e | 488 | \f |
0f2d19dd | 489 | static int |
e81d98ec | 490 | fport_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) |
0f2d19dd | 491 | { |
b3ec3c64 MD |
492 | scm_puts ("#<", port); |
493 | scm_print_port_mode (exp, port); | |
494 | if (SCM_OPFPORTP (exp)) | |
0f2d19dd | 495 | { |
b3ec3c64 | 496 | int fdes; |
b24b5e13 DH |
497 | SCM name = SCM_FILENAME (exp); |
498 | if (SCM_STRINGP (name) || SCM_SYMBOLP (name)) | |
499 | scm_display (name, port); | |
500 | else | |
501 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); | |
b3ec3c64 MD |
502 | scm_putc (' ', port); |
503 | fdes = (SCM_FSTREAM (exp))->fdes; | |
504 | ||
82893676 | 505 | #ifdef HAVE_TTYNAME |
b3ec3c64 MD |
506 | if (isatty (fdes)) |
507 | scm_puts (ttyname (fdes), port); | |
508 | else | |
82893676 | 509 | #endif /* HAVE_TTYNAME */ |
b3ec3c64 | 510 | scm_intprint (fdes, 10, port); |
0f2d19dd JB |
511 | } |
512 | else | |
513 | { | |
b3ec3c64 MD |
514 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); |
515 | scm_putc (' ', port); | |
63bcad19 | 516 | scm_intprint ((scm_t_bits) SCM_PTAB_ENTRY (exp), 16, port); |
0f2d19dd | 517 | } |
b3ec3c64 MD |
518 | scm_putc ('>', port); |
519 | return 1; | |
0f2d19dd JB |
520 | } |
521 | ||
cb63cf9e JB |
522 | #ifdef GUILE_ISELECT |
523 | /* thread-local block for input on fport's fdes. */ | |
524 | static void | |
525 | fport_wait_for_input (SCM port) | |
3cb988bd | 526 | { |
cb63cf9e | 527 | int fdes = SCM_FSTREAM (port)->fdes; |
3cb988bd | 528 | |
affc96b5 | 529 | if (!fport_input_waiting (port)) |
8122b543 | 530 | { |
cb63cf9e JB |
531 | int n; |
532 | SELECT_TYPE readfds; | |
533 | int flags = fcntl (fdes, F_GETFL); | |
534 | ||
535 | if (flags == -1) | |
536 | scm_syserror ("scm_fdes_wait_for_input"); | |
537 | if (!(flags & O_NONBLOCK)) | |
538 | do | |
539 | { | |
540 | FD_ZERO (&readfds); | |
541 | FD_SET (fdes, &readfds); | |
542 | n = scm_internal_select (fdes + 1, &readfds, NULL, NULL, NULL); | |
543 | } | |
544 | while (n == -1 && errno == EINTR); | |
8122b543 | 545 | } |
3cb988bd | 546 | } |
0f2d19dd JB |
547 | #endif |
548 | ||
affc96b5 | 549 | static void fport_flush (SCM port); |
0f2d19dd | 550 | |
c2da2648 GH |
551 | /* fill a port's read-buffer with a single read. returns the first |
552 | char or EOF if end of file. */ | |
0f2d19dd | 553 | static int |
affc96b5 | 554 | fport_fill_input (SCM port) |
0f2d19dd | 555 | { |
c014a02e | 556 | long count; |
92c2555f MV |
557 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
558 | scm_t_fport *fp = SCM_FSTREAM (port); | |
cb63cf9e | 559 | |
cb63cf9e JB |
560 | #ifdef GUILE_ISELECT |
561 | fport_wait_for_input (port); | |
562 | #endif | |
563 | SCM_SYSCALL (count = read (fp->fdes, pt->read_buf, pt->read_buf_size)); | |
564 | if (count == -1) | |
affc96b5 | 565 | scm_syserror ("fport_fill_input"); |
cb63cf9e JB |
566 | if (count == 0) |
567 | return EOF; | |
568 | else | |
569 | { | |
5c070ca7 | 570 | pt->read_pos = pt->read_buf; |
cb63cf9e | 571 | pt->read_end = pt->read_buf + count; |
5c070ca7 | 572 | return *pt->read_buf; |
cb63cf9e | 573 | } |
0f2d19dd JB |
574 | } |
575 | ||
cb63cf9e | 576 | static off_t |
affc96b5 | 577 | fport_seek (SCM port, off_t offset, int whence) |
0f2d19dd | 578 | { |
92c2555f MV |
579 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
580 | scm_t_fport *fp = SCM_FSTREAM (port); | |
7dcb364d GH |
581 | off_t rv; |
582 | off_t result; | |
583 | ||
584 | if (pt->rw_active == SCM_PORT_WRITE) | |
585 | { | |
586 | if (offset != 0 || whence != SEEK_CUR) | |
587 | { | |
588 | fport_flush (port); | |
589 | result = rv = lseek (fp->fdes, offset, whence); | |
590 | } | |
591 | else | |
592 | { | |
593 | /* read current position without disturbing the buffer. */ | |
594 | rv = lseek (fp->fdes, offset, whence); | |
595 | result = rv + (pt->write_pos - pt->write_buf); | |
596 | } | |
597 | } | |
598 | else if (pt->rw_active == SCM_PORT_READ) | |
599 | { | |
600 | if (offset != 0 || whence != SEEK_CUR) | |
601 | { | |
602 | /* could expand to avoid a second seek. */ | |
603 | scm_end_input (port); | |
604 | result = rv = lseek (fp->fdes, offset, whence); | |
605 | } | |
606 | else | |
607 | { | |
608 | /* read current position without disturbing the buffer | |
609 | (particularly the unread-char buffer). */ | |
610 | rv = lseek (fp->fdes, offset, whence); | |
611 | result = rv - (pt->read_end - pt->read_pos); | |
612 | ||
613 | if (pt->read_buf == pt->putback_buf) | |
614 | result -= pt->saved_read_end - pt->saved_read_pos; | |
615 | } | |
616 | } | |
617 | else /* SCM_PORT_NEITHER */ | |
618 | { | |
619 | result = rv = lseek (fp->fdes, offset, whence); | |
620 | } | |
cb8dfa3f | 621 | |
7dcb364d | 622 | if (rv == -1) |
affc96b5 | 623 | scm_syserror ("fport_seek"); |
7dcb364d | 624 | |
cb8dfa3f | 625 | return result; |
0f2d19dd JB |
626 | } |
627 | ||
840ae05d | 628 | static void |
affc96b5 | 629 | fport_truncate (SCM port, off_t length) |
840ae05d | 630 | { |
92c2555f | 631 | scm_t_fport *fp = SCM_FSTREAM (port); |
840ae05d JB |
632 | |
633 | if (ftruncate (fp->fdes, length) == -1) | |
634 | scm_syserror ("ftruncate"); | |
635 | } | |
636 | ||
0c6d2191 GH |
637 | /* helper for fport_write: try to write data, using multiple system |
638 | calls if required. */ | |
639 | #define FUNC_NAME "write_all" | |
640 | static void write_all (SCM port, const void *data, size_t remaining) | |
641 | { | |
642 | int fdes = SCM_FSTREAM (port)->fdes; | |
643 | ||
644 | while (remaining > 0) | |
645 | { | |
82893676 | 646 | size_t done; |
0c6d2191 GH |
647 | |
648 | SCM_SYSCALL (done = write (fdes, data, remaining)); | |
649 | ||
650 | if (done == -1) | |
651 | SCM_SYSERROR; | |
652 | remaining -= done; | |
653 | data = ((const char *) data) + done; | |
654 | } | |
655 | } | |
656 | #undef FUNC_NAME | |
657 | ||
31703ab8 | 658 | static void |
8aa011a1 | 659 | fport_write (SCM port, const void *data, size_t size) |
31703ab8 | 660 | { |
0c6d2191 | 661 | /* this procedure tries to minimize the number of writes/flushes. */ |
92c2555f | 662 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
31703ab8 | 663 | |
0c6d2191 GH |
664 | if (pt->write_buf == &pt->shortbuf |
665 | || (pt->write_pos == pt->write_buf && size >= pt->write_buf_size)) | |
31703ab8 | 666 | { |
0c6d2191 GH |
667 | /* "unbuffered" port, or |
668 | port with empty buffer and data won't fit in buffer. */ | |
669 | write_all (port, data, size); | |
670 | return; | |
31703ab8 | 671 | } |
d3639214 | 672 | |
0c6d2191 GH |
673 | { |
674 | off_t space = pt->write_end - pt->write_pos; | |
675 | ||
676 | if (size <= space) | |
677 | { | |
678 | /* data fits in buffer. */ | |
679 | memcpy (pt->write_pos, data, size); | |
680 | pt->write_pos += size; | |
681 | if (pt->write_pos == pt->write_end) | |
682 | { | |
affc96b5 | 683 | fport_flush (port); |
0c6d2191 GH |
684 | /* we can skip the line-buffering check if nothing's buffered. */ |
685 | return; | |
686 | } | |
687 | } | |
688 | else | |
689 | { | |
690 | memcpy (pt->write_pos, data, space); | |
691 | pt->write_pos = pt->write_end; | |
692 | fport_flush (port); | |
693 | { | |
694 | const void *ptr = ((const char *) data) + space; | |
695 | size_t remaining = size - space; | |
696 | ||
697 | if (size >= pt->write_buf_size) | |
698 | { | |
699 | write_all (port, ptr, remaining); | |
700 | return; | |
701 | } | |
702 | else | |
703 | { | |
704 | memcpy (pt->write_pos, ptr, remaining); | |
705 | pt->write_pos += remaining; | |
706 | } | |
31703ab8 | 707 | } |
0c6d2191 | 708 | } |
31703ab8 | 709 | |
0c6d2191 GH |
710 | /* handle line buffering. */ |
711 | if ((SCM_CELL_WORD_0 (port) & SCM_BUFLINE) && memchr (data, '\n', size)) | |
712 | fport_flush (port); | |
713 | } | |
31703ab8 GH |
714 | } |
715 | ||
716 | /* becomes 1 when process is exiting: normal exception handling won't | |
717 | work by this time. */ | |
cb63cf9e | 718 | extern int terminating; |
0f2d19dd | 719 | |
cb63cf9e | 720 | static void |
affc96b5 | 721 | fport_flush (SCM port) |
0f2d19dd | 722 | { |
92c2555f MV |
723 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
724 | scm_t_fport *fp = SCM_FSTREAM (port); | |
6f760c1d | 725 | unsigned char *ptr = pt->write_buf; |
c014a02e ML |
726 | long init_size = pt->write_pos - pt->write_buf; |
727 | long remaining = init_size; | |
0f2d19dd | 728 | |
cb63cf9e JB |
729 | while (remaining > 0) |
730 | { | |
c014a02e | 731 | long count; |
cb63cf9e JB |
732 | |
733 | SCM_SYSCALL (count = write (fp->fdes, ptr, remaining)); | |
734 | if (count < 0) | |
735 | { | |
736 | /* error. assume nothing was written this call, but | |
737 | fix up the buffer for any previous successful writes. */ | |
c014a02e | 738 | long done = init_size - remaining; |
cb63cf9e JB |
739 | |
740 | if (done > 0) | |
741 | { | |
742 | int i; | |
743 | ||
744 | for (i = 0; i < remaining; i++) | |
745 | { | |
746 | *(pt->write_buf + i) = *(pt->write_buf + done + i); | |
747 | } | |
748 | pt->write_pos = pt->write_buf + remaining; | |
749 | } | |
6b72ac1d | 750 | if (terminating) |
cb63cf9e JB |
751 | { |
752 | const char *msg = "Error: could not flush file-descriptor "; | |
753 | char buf[11]; | |
754 | ||
755 | write (2, msg, strlen (msg)); | |
756 | sprintf (buf, "%d\n", fp->fdes); | |
757 | write (2, buf, strlen (buf)); | |
758 | ||
759 | count = remaining; | |
760 | } | |
6b72ac1d GH |
761 | else if (scm_gc_running_p) |
762 | { | |
763 | /* silently ignore the error. scm_error would abort if we | |
764 | called it now. */ | |
765 | count = remaining; | |
766 | } | |
767 | else | |
768 | scm_syserror ("fport_flush"); | |
cb63cf9e JB |
769 | } |
770 | ptr += count; | |
771 | remaining -= count; | |
772 | } | |
773 | pt->write_pos = pt->write_buf; | |
61e452ba | 774 | pt->rw_active = SCM_PORT_NEITHER; |
840ae05d JB |
775 | } |
776 | ||
283a1a0e | 777 | /* clear the read buffer and adjust the file position for unread bytes. */ |
840ae05d | 778 | static void |
affc96b5 | 779 | fport_end_input (SCM port, int offset) |
840ae05d | 780 | { |
92c2555f MV |
781 | scm_t_fport *fp = SCM_FSTREAM (port); |
782 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
283a1a0e GH |
783 | |
784 | offset += pt->read_end - pt->read_pos; | |
840ae05d | 785 | |
840ae05d JB |
786 | if (offset > 0) |
787 | { | |
788 | pt->read_pos = pt->read_end; | |
789 | /* will throw error if unread-char used at beginning of file | |
790 | then attempting to write. seems correct. */ | |
791 | if (lseek (fp->fdes, -offset, SEEK_CUR) == -1) | |
affc96b5 | 792 | scm_syserror ("fport_end_input"); |
840ae05d | 793 | } |
61e452ba | 794 | pt->rw_active = SCM_PORT_NEITHER; |
8f29fbd0 JB |
795 | } |
796 | ||
6a2c4c81 | 797 | static int |
affc96b5 | 798 | fport_close (SCM port) |
6a2c4c81 | 799 | { |
92c2555f MV |
800 | scm_t_fport *fp = SCM_FSTREAM (port); |
801 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
cb63cf9e | 802 | int rv; |
840ae05d | 803 | |
affc96b5 | 804 | fport_flush (port); |
cb63cf9e JB |
805 | SCM_SYSCALL (rv = close (fp->fdes)); |
806 | if (rv == -1 && errno != EBADF) | |
6b72ac1d GH |
807 | { |
808 | if (scm_gc_running_p) | |
809 | /* silently ignore the error. scm_error would abort if we | |
810 | called it now. */ | |
811 | ; | |
812 | else | |
813 | scm_syserror ("fport_close"); | |
814 | } | |
6c951427 GH |
815 | if (pt->read_buf == pt->putback_buf) |
816 | pt->read_buf = pt->saved_read_buf; | |
cb63cf9e | 817 | if (pt->read_buf != &pt->shortbuf) |
c6c79933 | 818 | scm_must_free (pt->read_buf); |
cb63cf9e | 819 | if (pt->write_buf != &pt->shortbuf) |
c6c79933 GH |
820 | scm_must_free (pt->write_buf); |
821 | scm_must_free ((char *) fp); | |
cb63cf9e | 822 | return rv; |
6a2c4c81 JB |
823 | } |
824 | ||
1be6b49c | 825 | static size_t |
affc96b5 | 826 | fport_free (SCM port) |
b3ec3c64 | 827 | { |
affc96b5 | 828 | fport_close (port); |
b3ec3c64 MD |
829 | return 0; |
830 | } | |
831 | ||
92c2555f | 832 | static scm_t_bits |
b3ec3c64 MD |
833 | scm_make_fptob () |
834 | { | |
92c2555f | 835 | scm_t_bits tc = scm_make_port_type ("file", fport_fill_input, fport_write); |
a98bddfd | 836 | |
affc96b5 | 837 | scm_set_port_free (tc, fport_free); |
e841c3e0 | 838 | scm_set_port_print (tc, fport_print); |
affc96b5 GH |
839 | scm_set_port_flush (tc, fport_flush); |
840 | scm_set_port_end_input (tc, fport_end_input); | |
841 | scm_set_port_close (tc, fport_close); | |
842 | scm_set_port_seek (tc, fport_seek); | |
843 | scm_set_port_truncate (tc, fport_truncate); | |
844 | scm_set_port_input_waiting (tc, fport_input_waiting); | |
a98bddfd DH |
845 | |
846 | return tc; | |
b3ec3c64 | 847 | } |
0f2d19dd | 848 | |
0f2d19dd JB |
849 | void |
850 | scm_init_fports () | |
0f2d19dd | 851 | { |
a98bddfd DH |
852 | scm_tc16_fport = scm_make_fptob (); |
853 | ||
86d31dfe MV |
854 | scm_c_define ("_IOFBF", SCM_MAKINUM (_IOFBF)); |
855 | scm_c_define ("_IOLBF", SCM_MAKINUM (_IOLBF)); | |
856 | scm_c_define ("_IONBF", SCM_MAKINUM (_IONBF)); | |
a98bddfd DH |
857 | |
858 | #ifndef SCM_MAGIC_SNARFER | |
859 | #include "libguile/fports.x" | |
860 | #endif | |
0f2d19dd | 861 | } |
89e00824 ML |
862 | |
863 | /* | |
864 | Local Variables: | |
865 | c-file-style: "gnu" | |
866 | End: | |
867 | */ |