Commit | Line | Data |
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c6c79933 | 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 |
cb63cf9e JB |
64 | #ifdef HAVE_ST_BLKSIZE |
65 | #include <sys/stat.h> | |
66 | #endif | |
0f2d19dd | 67 | |
cb63cf9e | 68 | #include <errno.h> |
e145dd02 | 69 | |
a0599745 | 70 | #include "libguile/iselect.h" |
cb63cf9e | 71 | |
a98bddfd DH |
72 | |
73 | scm_bits_t scm_tc16_fport; | |
74 | ||
75 | ||
19b27fa2 | 76 | /* default buffer size, used if the O/S won't supply a value. */ |
1be6b49c | 77 | static const size_t default_buffer_size = 1024; |
19b27fa2 | 78 | |
cb63cf9e JB |
79 | /* create FPORT buffer with specified sizes (or -1 to use default size or |
80 | 0 for no buffer. */ | |
81 | static void | |
c014a02e | 82 | scm_fport_buffer_add (SCM port, long read_size, int write_size) |
c6c79933 | 83 | #define FUNC_NAME "scm_fport_buffer_add" |
e145dd02 | 84 | { |
1be6b49c ML |
85 | scm_fport_t *fp = SCM_FSTREAM (port); |
86 | scm_port_t *pt = SCM_PTAB_ENTRY (port); | |
e145dd02 | 87 | |
cb63cf9e JB |
88 | if (read_size == -1 || write_size == -1) |
89 | { | |
1be6b49c | 90 | size_t default_size; |
cb63cf9e JB |
91 | #ifdef HAVE_ST_BLKSIZE |
92 | struct stat st; | |
93 | ||
19b27fa2 GH |
94 | default_size = (fstat (fp->fdes, &st) == -1) ? default_buffer_size |
95 | : st.st_blksize; | |
cb63cf9e | 96 | #else |
19b27fa2 | 97 | default_size = default_buffer_size; |
cb63cf9e JB |
98 | #endif |
99 | if (read_size == -1) | |
100 | read_size = default_size; | |
101 | if (write_size == -1) | |
102 | write_size = default_size; | |
103 | } | |
0f2d19dd | 104 | |
f5f2dcff | 105 | if (SCM_INPUT_PORT_P (port) && read_size > 0) |
cb63cf9e | 106 | { |
c6c79933 | 107 | pt->read_buf = scm_must_malloc (read_size, FUNC_NAME); |
cb63cf9e JB |
108 | pt->read_pos = pt->read_end = pt->read_buf; |
109 | pt->read_buf_size = read_size; | |
110 | } | |
111 | else | |
112 | { | |
840ae05d | 113 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; |
cb63cf9e JB |
114 | pt->read_buf_size = 1; |
115 | } | |
1717856b | 116 | |
f5f2dcff | 117 | if (SCM_OUTPUT_PORT_P (port) && write_size > 0) |
cb63cf9e | 118 | { |
c6c79933 | 119 | pt->write_buf = scm_must_malloc (write_size, FUNC_NAME); |
cb63cf9e JB |
120 | pt->write_pos = pt->write_buf; |
121 | pt->write_buf_size = write_size; | |
122 | } | |
123 | else | |
124 | { | |
125 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
126 | pt->write_buf_size = 1; | |
127 | } | |
128 | ||
129 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
130 | if (read_size > 0 || write_size > 0) | |
54778cd3 | 131 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0); |
cb63cf9e | 132 | else |
54778cd3 | 133 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUF0); |
7a6f1ffa | 134 | } |
c6c79933 | 135 | #undef FUNC_NAME |
7a6f1ffa | 136 | |
a1ec6916 | 137 | SCM_DEFINE (scm_setvbuf, "setvbuf", 2, 1, 0, |
1bbd0b84 | 138 | (SCM port, SCM mode, SCM size), |
fc0d72d4 MD |
139 | "Set the buffering mode for @var{port}. @var{mode} can be:\n" |
140 | "@table @code\n" | |
141 | "@item _IONBF\n" | |
142 | "non-buffered\n" | |
143 | "@item _IOLBF\n" | |
144 | "line buffered\n" | |
145 | "@item _IOFBF\n" | |
146 | "block buffered, using a newly allocated buffer of @var{size} bytes.\n" | |
147 | "If @var{size} is omitted, a default size will be used.\n" | |
2c1ae20e | 148 | "@end table") |
1bbd0b84 | 149 | #define FUNC_NAME s_scm_setvbuf |
7a6f1ffa | 150 | { |
1be6b49c | 151 | int cmode; |
c014a02e | 152 | long csize; |
1be6b49c | 153 | scm_port_t *pt; |
7a6f1ffa | 154 | |
78446828 MV |
155 | port = SCM_COERCE_OUTPORT (port); |
156 | ||
3b3b36dd GB |
157 | SCM_VALIDATE_OPFPORT (1,port); |
158 | SCM_VALIDATE_INUM_COPY (2,mode,cmode); | |
d3639214 | 159 | if (cmode != _IONBF && cmode != _IOFBF && cmode != _IOLBF) |
1bbd0b84 | 160 | scm_out_of_range (FUNC_NAME, mode); |
d3639214 GH |
161 | |
162 | if (cmode == _IOLBF) | |
163 | { | |
54778cd3 | 164 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUFLINE); |
d3639214 GH |
165 | cmode = _IOFBF; |
166 | } | |
167 | else | |
168 | { | |
54778cd3 | 169 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) ^ SCM_BUFLINE); |
d3639214 GH |
170 | } |
171 | ||
7a6f1ffa | 172 | if (SCM_UNBNDP (size)) |
cb63cf9e JB |
173 | { |
174 | if (cmode == _IOFBF) | |
175 | csize = -1; | |
176 | else | |
177 | csize = 0; | |
178 | } | |
7a6f1ffa GH |
179 | else |
180 | { | |
3b3b36dd | 181 | SCM_VALIDATE_INUM_COPY (3,size,csize); |
cb63cf9e | 182 | if (csize < 0 || (cmode == _IONBF && csize > 0)) |
1bbd0b84 | 183 | scm_out_of_range (FUNC_NAME, size); |
7a6f1ffa | 184 | } |
d3639214 | 185 | |
cb63cf9e | 186 | pt = SCM_PTAB_ENTRY (port); |
7a6f1ffa | 187 | |
cb63cf9e JB |
188 | /* silently discards buffered chars. */ |
189 | if (pt->read_buf != &pt->shortbuf) | |
c6c79933 | 190 | scm_must_free (pt->read_buf); |
cb63cf9e | 191 | if (pt->write_buf != &pt->shortbuf) |
c6c79933 | 192 | scm_must_free (pt->write_buf); |
7a6f1ffa | 193 | |
cb63cf9e JB |
194 | scm_fport_buffer_add (port, csize, csize); |
195 | return SCM_UNSPECIFIED; | |
0f2d19dd | 196 | } |
1bbd0b84 | 197 | #undef FUNC_NAME |
0f2d19dd | 198 | |
eadd48de GH |
199 | /* Move ports with the specified file descriptor to new descriptors, |
200 | * reseting the revealed count to 0. | |
0f2d19dd | 201 | */ |
1717856b | 202 | |
eadd48de | 203 | void |
6e8d25a6 | 204 | scm_evict_ports (int fd) |
0f2d19dd | 205 | { |
c014a02e | 206 | long i; |
0f2d19dd | 207 | |
eadd48de GH |
208 | for (i = 0; i < scm_port_table_size; i++) |
209 | { | |
cb63cf9e JB |
210 | SCM port = scm_port_table[i]->port; |
211 | ||
212 | if (SCM_FPORTP (port)) | |
eadd48de | 213 | { |
1be6b49c | 214 | scm_fport_t *fp = SCM_FSTREAM (port); |
cb63cf9e JB |
215 | |
216 | if (fp->fdes == fd) | |
217 | { | |
218 | fp->fdes = dup (fd); | |
219 | if (fp->fdes == -1) | |
220 | scm_syserror ("scm_evict_ports"); | |
221 | scm_set_port_revealed_x (port, SCM_MAKINUM (0)); | |
222 | } | |
eadd48de GH |
223 | } |
224 | } | |
225 | } | |
0f2d19dd | 226 | |
efa40607 DH |
227 | |
228 | SCM_DEFINE (scm_file_port_p, "file-port?", 1, 0, 0, | |
229 | (SCM obj), | |
2069af38 | 230 | "Determine whether @var{obj} is a port that is related to a file.") |
efa40607 DH |
231 | #define FUNC_NAME s_scm_file_port_p |
232 | { | |
233 | return SCM_BOOL (SCM_FPORTP (obj)); | |
234 | } | |
235 | #undef FUNC_NAME | |
236 | ||
237 | ||
0f2d19dd JB |
238 | /* scm_open_file |
239 | * Return a new port open on a given file. | |
240 | * | |
241 | * The mode string must match the pattern: [rwa+]** which | |
242 | * is interpreted in the usual unix way. | |
243 | * | |
244 | * Return the new port. | |
245 | */ | |
3b3b36dd | 246 | SCM_DEFINE (scm_open_file, "open-file", 2, 0, 0, |
1e6808ea MG |
247 | (SCM filename, SCM mode), |
248 | "Open the file whose name is @var{filename}, and return a port\n" | |
fc0d72d4 | 249 | "representing that file. The attributes of the port are\n" |
1e6808ea MG |
250 | "determined by the @var{mode} string. The way in which this is\n" |
251 | "interpreted is similar to C stdio. The first character must be\n" | |
252 | "one of the following:\n" | |
fc0d72d4 MD |
253 | "@table @samp\n" |
254 | "@item r\n" | |
255 | "Open an existing file for input.\n" | |
256 | "@item w\n" | |
257 | "Open a file for output, creating it if it doesn't already exist\n" | |
258 | "or removing its contents if it does.\n" | |
259 | "@item a\n" | |
1e6808ea MG |
260 | "Open a file for output, creating it if it doesn't already\n" |
261 | "exist. All writes to the port will go to the end of the file.\n" | |
fc0d72d4 MD |
262 | "The \"append mode\" can be turned off while the port is in use\n" |
263 | "@pxref{Ports and File Descriptors, fcntl}\n" | |
1e6808ea MG |
264 | "@end table\n" |
265 | "The following additional characters can be appended:\n" | |
fc0d72d4 MD |
266 | "@table @samp\n" |
267 | "@item +\n" | |
268 | "Open the port for both input and output. E.g., @code{r+}: open\n" | |
269 | "an existing file for both input and output.\n" | |
270 | "@item 0\n" | |
1e6808ea MG |
271 | "Create an \"unbuffered\" port. In this case input and output\n" |
272 | "operations are passed directly to the underlying port\n" | |
273 | "implementation without additional buffering. This is likely to\n" | |
274 | "slow down I/O operations. The buffering mode can be changed\n" | |
275 | "while a port is in use @pxref{Ports and File Descriptors,\n" | |
276 | "setvbuf}\n" | |
fc0d72d4 MD |
277 | "@item l\n" |
278 | "Add line-buffering to the port. The port output buffer will be\n" | |
279 | "automatically flushed whenever a newline character is written.\n" | |
1e6808ea MG |
280 | "@end table\n" |
281 | "In theory we could create read/write ports which were buffered\n" | |
282 | "in one direction only. However this isn't included in the\n" | |
283 | "current interfaces. If a file cannot be opened with the access\n" | |
284 | "requested, @code{open-file} throws an exception.") | |
1bbd0b84 | 285 | #define FUNC_NAME s_scm_open_file |
0f2d19dd | 286 | { |
19639113 | 287 | SCM port; |
cb63cf9e JB |
288 | int fdes; |
289 | int flags = 0; | |
19639113 | 290 | char *file; |
1e6808ea | 291 | char *md; |
cb63cf9e | 292 | char *ptr; |
19639113 | 293 | |
a6d9e5ab | 294 | SCM_VALIDATE_STRING (1, filename); |
1e6808ea | 295 | SCM_VALIDATE_STRING (2, mode); |
a6d9e5ab | 296 | SCM_STRING_COERCE_0TERMINATION_X (filename); |
1e6808ea | 297 | SCM_STRING_COERCE_0TERMINATION_X (mode); |
19639113 | 298 | |
a6d9e5ab | 299 | file = SCM_STRING_CHARS (filename); |
1e6808ea | 300 | md = SCM_STRING_CHARS (mode); |
19639113 | 301 | |
1e6808ea | 302 | switch (*md) |
0f2d19dd | 303 | { |
cb63cf9e JB |
304 | case 'r': |
305 | flags |= O_RDONLY; | |
306 | break; | |
307 | case 'w': | |
308 | flags |= O_WRONLY | O_CREAT | O_TRUNC; | |
309 | break; | |
310 | case 'a': | |
311 | flags |= O_WRONLY | O_CREAT | O_APPEND; | |
312 | break; | |
313 | default: | |
1e6808ea | 314 | scm_out_of_range (FUNC_NAME, mode); |
0f2d19dd | 315 | } |
1e6808ea | 316 | ptr = md + 1; |
cb63cf9e | 317 | while (*ptr != '\0') |
e145dd02 | 318 | { |
cb63cf9e JB |
319 | switch (*ptr) |
320 | { | |
321 | case '+': | |
322 | flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR; | |
323 | break; | |
9f561420 GH |
324 | case 'b': |
325 | #if defined (O_BINARY) | |
326 | flags |= O_BINARY; | |
327 | #endif | |
328 | break; | |
cb63cf9e | 329 | case '0': /* unbuffered: handled later. */ |
d3639214 | 330 | case 'l': /* line buffered: handled during output. */ |
cb63cf9e JB |
331 | break; |
332 | default: | |
1e6808ea | 333 | scm_out_of_range (FUNC_NAME, mode); |
cb63cf9e JB |
334 | } |
335 | ptr++; | |
e145dd02 | 336 | } |
cb63cf9e JB |
337 | SCM_SYSCALL (fdes = open (file, flags, 0666)); |
338 | if (fdes == -1) | |
e145dd02 | 339 | { |
cb63cf9e JB |
340 | int en = errno; |
341 | ||
5d2d2ffc | 342 | SCM_SYSERROR_MSG ("~A: ~S", |
cb63cf9e | 343 | scm_cons (scm_makfrom0str (strerror (en)), |
5d2d2ffc | 344 | scm_cons (filename, SCM_EOL)), en); |
0f2d19dd | 345 | } |
1e6808ea | 346 | port = scm_fdes_to_port (fdes, md, filename); |
0f2d19dd JB |
347 | return port; |
348 | } | |
1bbd0b84 | 349 | #undef FUNC_NAME |
0f2d19dd | 350 | |
e145dd02 | 351 | \f |
cb63cf9e | 352 | /* Building Guile ports from a file descriptor. */ |
e145dd02 | 353 | |
cb63cf9e | 354 | /* Build a Scheme port from an open file descriptor `fdes'. |
a089567e JB |
355 | MODE indicates whether FILE is open for reading or writing; it uses |
356 | the same notation as open-file's second argument. | |
19b27fa2 GH |
357 | NAME is a string to be used as the port's filename. |
358 | */ | |
a089567e | 359 | SCM |
cb63cf9e | 360 | scm_fdes_to_port (int fdes, char *mode, SCM name) |
19b27fa2 | 361 | #define FUNC_NAME "scm_fdes_to_port" |
a089567e JB |
362 | { |
363 | long mode_bits = scm_mode_bits (mode); | |
364 | SCM port; | |
1be6b49c | 365 | scm_port_t *pt; |
19b27fa2 GH |
366 | int flags; |
367 | ||
368 | /* test that fdes is valid. */ | |
369 | flags = fcntl (fdes, F_GETFL, 0); | |
370 | if (flags == -1) | |
371 | SCM_SYSERROR; | |
372 | flags &= O_ACCMODE; | |
373 | if (flags != O_RDWR | |
374 | && ((flags != O_WRONLY && (mode_bits & SCM_WRTNG)) | |
375 | || (flags != O_RDONLY && (mode_bits & SCM_RDNG)))) | |
376 | { | |
377 | SCM_MISC_ERROR ("requested file mode not available on fdes", SCM_EOL); | |
378 | } | |
a089567e JB |
379 | |
380 | SCM_NEWCELL (port); | |
381 | SCM_DEFER_INTS; | |
cb63cf9e JB |
382 | pt = scm_add_to_port_table (port); |
383 | SCM_SETPTAB_ENTRY (port, pt); | |
54778cd3 | 384 | SCM_SET_CELL_TYPE (port, (scm_tc16_fport | mode_bits)); |
cb63cf9e | 385 | |
a089567e | 386 | { |
1be6b49c ML |
387 | scm_fport_t *fp |
388 | = (scm_fport_t *) scm_must_malloc (sizeof (scm_fport_t), | |
c6c79933 GH |
389 | FUNC_NAME); |
390 | ||
cb63cf9e | 391 | fp->fdes = fdes; |
0de97b83 | 392 | pt->rw_random = SCM_FDES_RANDOM_P (fdes); |
cb63cf9e JB |
393 | SCM_SETSTREAM (port, fp); |
394 | if (mode_bits & SCM_BUF0) | |
395 | scm_fport_buffer_add (port, 0, 0); | |
396 | else | |
397 | scm_fport_buffer_add (port, -1, -1); | |
a089567e | 398 | } |
b24b5e13 | 399 | SCM_SET_FILENAME (port, name); |
a089567e | 400 | SCM_ALLOW_INTS; |
e145dd02 JB |
401 | return port; |
402 | } | |
19b27fa2 | 403 | #undef FUNC_NAME |
e145dd02 | 404 | |
affc96b5 | 405 | /* Return a lower bound on the number of bytes available for input. */ |
cb63cf9e | 406 | static int |
affc96b5 | 407 | fport_input_waiting (SCM port) |
e145dd02 | 408 | { |
cb63cf9e JB |
409 | int fdes = SCM_FSTREAM (port)->fdes; |
410 | ||
411 | #ifdef HAVE_SELECT | |
412 | struct timeval timeout; | |
413 | SELECT_TYPE read_set; | |
414 | SELECT_TYPE write_set; | |
415 | SELECT_TYPE except_set; | |
416 | ||
417 | FD_ZERO (&read_set); | |
418 | FD_ZERO (&write_set); | |
419 | FD_ZERO (&except_set); | |
420 | ||
421 | FD_SET (fdes, &read_set); | |
422 | ||
423 | timeout.tv_sec = 0; | |
424 | timeout.tv_usec = 0; | |
425 | ||
426 | if (select (SELECT_SET_SIZE, | |
427 | &read_set, &write_set, &except_set, &timeout) | |
428 | < 0) | |
affc96b5 GH |
429 | scm_syserror ("fport_input_waiting"); |
430 | return FD_ISSET (fdes, &read_set) ? 1 : 0; | |
cb63cf9e JB |
431 | #elif defined (FIONREAD) |
432 | int remir; | |
433 | ioctl(fdes, FIONREAD, &remir); | |
434 | return remir; | |
435 | #else | |
affc96b5 | 436 | scm_misc_error ("fport_input_waiting", |
cb63cf9e JB |
437 | "Not fully implemented on this platform", |
438 | SCM_EOL); | |
439 | #endif | |
a089567e JB |
440 | } |
441 | ||
cb63cf9e | 442 | \f |
0f2d19dd | 443 | static int |
e841c3e0 | 444 | fport_print (SCM exp, SCM port, scm_print_state *pstate) |
0f2d19dd | 445 | { |
b3ec3c64 MD |
446 | scm_puts ("#<", port); |
447 | scm_print_port_mode (exp, port); | |
448 | if (SCM_OPFPORTP (exp)) | |
0f2d19dd | 449 | { |
b3ec3c64 | 450 | int fdes; |
b24b5e13 DH |
451 | SCM name = SCM_FILENAME (exp); |
452 | if (SCM_STRINGP (name) || SCM_SYMBOLP (name)) | |
453 | scm_display (name, port); | |
454 | else | |
455 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); | |
b3ec3c64 MD |
456 | scm_putc (' ', port); |
457 | fdes = (SCM_FSTREAM (exp))->fdes; | |
458 | ||
459 | if (isatty (fdes)) | |
460 | scm_puts (ttyname (fdes), port); | |
461 | else | |
462 | scm_intprint (fdes, 10, port); | |
0f2d19dd JB |
463 | } |
464 | else | |
465 | { | |
b3ec3c64 MD |
466 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); |
467 | scm_putc (' ', port); | |
f1267706 | 468 | scm_intprint (SCM_UNPACK (SCM_CDR (exp)), 16, port); |
0f2d19dd | 469 | } |
b3ec3c64 MD |
470 | scm_putc ('>', port); |
471 | return 1; | |
0f2d19dd JB |
472 | } |
473 | ||
cb63cf9e JB |
474 | #ifdef GUILE_ISELECT |
475 | /* thread-local block for input on fport's fdes. */ | |
476 | static void | |
477 | fport_wait_for_input (SCM port) | |
3cb988bd | 478 | { |
cb63cf9e | 479 | int fdes = SCM_FSTREAM (port)->fdes; |
3cb988bd | 480 | |
affc96b5 | 481 | if (!fport_input_waiting (port)) |
8122b543 | 482 | { |
cb63cf9e JB |
483 | int n; |
484 | SELECT_TYPE readfds; | |
485 | int flags = fcntl (fdes, F_GETFL); | |
486 | ||
487 | if (flags == -1) | |
488 | scm_syserror ("scm_fdes_wait_for_input"); | |
489 | if (!(flags & O_NONBLOCK)) | |
490 | do | |
491 | { | |
492 | FD_ZERO (&readfds); | |
493 | FD_SET (fdes, &readfds); | |
494 | n = scm_internal_select (fdes + 1, &readfds, NULL, NULL, NULL); | |
495 | } | |
496 | while (n == -1 && errno == EINTR); | |
8122b543 | 497 | } |
3cb988bd | 498 | } |
0f2d19dd JB |
499 | #endif |
500 | ||
affc96b5 | 501 | static void fport_flush (SCM port); |
0f2d19dd | 502 | |
c2da2648 GH |
503 | /* fill a port's read-buffer with a single read. returns the first |
504 | char or EOF if end of file. */ | |
0f2d19dd | 505 | static int |
affc96b5 | 506 | fport_fill_input (SCM port) |
0f2d19dd | 507 | { |
c014a02e | 508 | long count; |
1be6b49c ML |
509 | scm_port_t *pt = SCM_PTAB_ENTRY (port); |
510 | scm_fport_t *fp = SCM_FSTREAM (port); | |
cb63cf9e | 511 | |
cb63cf9e JB |
512 | #ifdef GUILE_ISELECT |
513 | fport_wait_for_input (port); | |
514 | #endif | |
515 | SCM_SYSCALL (count = read (fp->fdes, pt->read_buf, pt->read_buf_size)); | |
516 | if (count == -1) | |
affc96b5 | 517 | scm_syserror ("fport_fill_input"); |
cb63cf9e JB |
518 | if (count == 0) |
519 | return EOF; | |
520 | else | |
521 | { | |
5c070ca7 | 522 | pt->read_pos = pt->read_buf; |
cb63cf9e | 523 | pt->read_end = pt->read_buf + count; |
5c070ca7 | 524 | return *pt->read_buf; |
cb63cf9e | 525 | } |
0f2d19dd JB |
526 | } |
527 | ||
cb63cf9e | 528 | static off_t |
affc96b5 | 529 | fport_seek (SCM port, off_t offset, int whence) |
0f2d19dd | 530 | { |
1be6b49c ML |
531 | scm_port_t *pt = SCM_PTAB_ENTRY (port); |
532 | scm_fport_t *fp = SCM_FSTREAM (port); | |
7dcb364d GH |
533 | off_t rv; |
534 | off_t result; | |
535 | ||
536 | if (pt->rw_active == SCM_PORT_WRITE) | |
537 | { | |
538 | if (offset != 0 || whence != SEEK_CUR) | |
539 | { | |
540 | fport_flush (port); | |
541 | result = rv = lseek (fp->fdes, offset, whence); | |
542 | } | |
543 | else | |
544 | { | |
545 | /* read current position without disturbing the buffer. */ | |
546 | rv = lseek (fp->fdes, offset, whence); | |
547 | result = rv + (pt->write_pos - pt->write_buf); | |
548 | } | |
549 | } | |
550 | else if (pt->rw_active == SCM_PORT_READ) | |
551 | { | |
552 | if (offset != 0 || whence != SEEK_CUR) | |
553 | { | |
554 | /* could expand to avoid a second seek. */ | |
555 | scm_end_input (port); | |
556 | result = rv = lseek (fp->fdes, offset, whence); | |
557 | } | |
558 | else | |
559 | { | |
560 | /* read current position without disturbing the buffer | |
561 | (particularly the unread-char buffer). */ | |
562 | rv = lseek (fp->fdes, offset, whence); | |
563 | result = rv - (pt->read_end - pt->read_pos); | |
564 | ||
565 | if (pt->read_buf == pt->putback_buf) | |
566 | result -= pt->saved_read_end - pt->saved_read_pos; | |
567 | } | |
568 | } | |
569 | else /* SCM_PORT_NEITHER */ | |
570 | { | |
571 | result = rv = lseek (fp->fdes, offset, whence); | |
572 | } | |
cb8dfa3f | 573 | |
7dcb364d | 574 | if (rv == -1) |
affc96b5 | 575 | scm_syserror ("fport_seek"); |
7dcb364d | 576 | |
cb8dfa3f | 577 | return result; |
0f2d19dd JB |
578 | } |
579 | ||
840ae05d | 580 | static void |
affc96b5 | 581 | fport_truncate (SCM port, off_t length) |
840ae05d | 582 | { |
1be6b49c | 583 | scm_fport_t *fp = SCM_FSTREAM (port); |
840ae05d JB |
584 | |
585 | if (ftruncate (fp->fdes, length) == -1) | |
586 | scm_syserror ("ftruncate"); | |
587 | } | |
588 | ||
0c6d2191 GH |
589 | /* helper for fport_write: try to write data, using multiple system |
590 | calls if required. */ | |
591 | #define FUNC_NAME "write_all" | |
592 | static void write_all (SCM port, const void *data, size_t remaining) | |
593 | { | |
594 | int fdes = SCM_FSTREAM (port)->fdes; | |
595 | ||
596 | while (remaining > 0) | |
597 | { | |
598 | ssize_t done; | |
599 | ||
600 | SCM_SYSCALL (done = write (fdes, data, remaining)); | |
601 | ||
602 | if (done == -1) | |
603 | SCM_SYSERROR; | |
604 | remaining -= done; | |
605 | data = ((const char *) data) + done; | |
606 | } | |
607 | } | |
608 | #undef FUNC_NAME | |
609 | ||
31703ab8 | 610 | static void |
8aa011a1 | 611 | fport_write (SCM port, const void *data, size_t size) |
31703ab8 | 612 | { |
0c6d2191 | 613 | /* this procedure tries to minimize the number of writes/flushes. */ |
1be6b49c | 614 | scm_port_t *pt = SCM_PTAB_ENTRY (port); |
31703ab8 | 615 | |
0c6d2191 GH |
616 | if (pt->write_buf == &pt->shortbuf |
617 | || (pt->write_pos == pt->write_buf && size >= pt->write_buf_size)) | |
31703ab8 | 618 | { |
0c6d2191 GH |
619 | /* "unbuffered" port, or |
620 | port with empty buffer and data won't fit in buffer. */ | |
621 | write_all (port, data, size); | |
622 | return; | |
31703ab8 | 623 | } |
d3639214 | 624 | |
0c6d2191 GH |
625 | { |
626 | off_t space = pt->write_end - pt->write_pos; | |
627 | ||
628 | if (size <= space) | |
629 | { | |
630 | /* data fits in buffer. */ | |
631 | memcpy (pt->write_pos, data, size); | |
632 | pt->write_pos += size; | |
633 | if (pt->write_pos == pt->write_end) | |
634 | { | |
affc96b5 | 635 | fport_flush (port); |
0c6d2191 GH |
636 | /* we can skip the line-buffering check if nothing's buffered. */ |
637 | return; | |
638 | } | |
639 | } | |
640 | else | |
641 | { | |
642 | memcpy (pt->write_pos, data, space); | |
643 | pt->write_pos = pt->write_end; | |
644 | fport_flush (port); | |
645 | { | |
646 | const void *ptr = ((const char *) data) + space; | |
647 | size_t remaining = size - space; | |
648 | ||
649 | if (size >= pt->write_buf_size) | |
650 | { | |
651 | write_all (port, ptr, remaining); | |
652 | return; | |
653 | } | |
654 | else | |
655 | { | |
656 | memcpy (pt->write_pos, ptr, remaining); | |
657 | pt->write_pos += remaining; | |
658 | } | |
31703ab8 | 659 | } |
0c6d2191 | 660 | } |
31703ab8 | 661 | |
0c6d2191 GH |
662 | /* handle line buffering. */ |
663 | if ((SCM_CELL_WORD_0 (port) & SCM_BUFLINE) && memchr (data, '\n', size)) | |
664 | fport_flush (port); | |
665 | } | |
31703ab8 GH |
666 | } |
667 | ||
668 | /* becomes 1 when process is exiting: normal exception handling won't | |
669 | work by this time. */ | |
cb63cf9e | 670 | extern int terminating; |
0f2d19dd | 671 | |
cb63cf9e | 672 | static void |
affc96b5 | 673 | fport_flush (SCM port) |
0f2d19dd | 674 | { |
1be6b49c ML |
675 | scm_port_t *pt = SCM_PTAB_ENTRY (port); |
676 | scm_fport_t *fp = SCM_FSTREAM (port); | |
6f760c1d | 677 | unsigned char *ptr = pt->write_buf; |
c014a02e ML |
678 | long init_size = pt->write_pos - pt->write_buf; |
679 | long remaining = init_size; | |
0f2d19dd | 680 | |
cb63cf9e JB |
681 | while (remaining > 0) |
682 | { | |
c014a02e | 683 | long count; |
cb63cf9e JB |
684 | |
685 | SCM_SYSCALL (count = write (fp->fdes, ptr, remaining)); | |
686 | if (count < 0) | |
687 | { | |
688 | /* error. assume nothing was written this call, but | |
689 | fix up the buffer for any previous successful writes. */ | |
c014a02e | 690 | long done = init_size - remaining; |
cb63cf9e JB |
691 | |
692 | if (done > 0) | |
693 | { | |
694 | int i; | |
695 | ||
696 | for (i = 0; i < remaining; i++) | |
697 | { | |
698 | *(pt->write_buf + i) = *(pt->write_buf + done + i); | |
699 | } | |
700 | pt->write_pos = pt->write_buf + remaining; | |
701 | } | |
6b72ac1d | 702 | if (terminating) |
cb63cf9e JB |
703 | { |
704 | const char *msg = "Error: could not flush file-descriptor "; | |
705 | char buf[11]; | |
706 | ||
707 | write (2, msg, strlen (msg)); | |
708 | sprintf (buf, "%d\n", fp->fdes); | |
709 | write (2, buf, strlen (buf)); | |
710 | ||
711 | count = remaining; | |
712 | } | |
6b72ac1d GH |
713 | else if (scm_gc_running_p) |
714 | { | |
715 | /* silently ignore the error. scm_error would abort if we | |
716 | called it now. */ | |
717 | count = remaining; | |
718 | } | |
719 | else | |
720 | scm_syserror ("fport_flush"); | |
cb63cf9e JB |
721 | } |
722 | ptr += count; | |
723 | remaining -= count; | |
724 | } | |
725 | pt->write_pos = pt->write_buf; | |
61e452ba | 726 | pt->rw_active = SCM_PORT_NEITHER; |
840ae05d JB |
727 | } |
728 | ||
283a1a0e | 729 | /* clear the read buffer and adjust the file position for unread bytes. */ |
840ae05d | 730 | static void |
affc96b5 | 731 | fport_end_input (SCM port, int offset) |
840ae05d | 732 | { |
1be6b49c ML |
733 | scm_fport_t *fp = SCM_FSTREAM (port); |
734 | scm_port_t *pt = SCM_PTAB_ENTRY (port); | |
283a1a0e GH |
735 | |
736 | offset += pt->read_end - pt->read_pos; | |
840ae05d | 737 | |
840ae05d JB |
738 | if (offset > 0) |
739 | { | |
740 | pt->read_pos = pt->read_end; | |
741 | /* will throw error if unread-char used at beginning of file | |
742 | then attempting to write. seems correct. */ | |
743 | if (lseek (fp->fdes, -offset, SEEK_CUR) == -1) | |
affc96b5 | 744 | scm_syserror ("fport_end_input"); |
840ae05d | 745 | } |
61e452ba | 746 | pt->rw_active = SCM_PORT_NEITHER; |
8f29fbd0 JB |
747 | } |
748 | ||
6a2c4c81 | 749 | static int |
affc96b5 | 750 | fport_close (SCM port) |
6a2c4c81 | 751 | { |
1be6b49c ML |
752 | scm_fport_t *fp = SCM_FSTREAM (port); |
753 | scm_port_t *pt = SCM_PTAB_ENTRY (port); | |
cb63cf9e | 754 | int rv; |
840ae05d | 755 | |
affc96b5 | 756 | fport_flush (port); |
cb63cf9e JB |
757 | SCM_SYSCALL (rv = close (fp->fdes)); |
758 | if (rv == -1 && errno != EBADF) | |
6b72ac1d GH |
759 | { |
760 | if (scm_gc_running_p) | |
761 | /* silently ignore the error. scm_error would abort if we | |
762 | called it now. */ | |
763 | ; | |
764 | else | |
765 | scm_syserror ("fport_close"); | |
766 | } | |
6c951427 GH |
767 | if (pt->read_buf == pt->putback_buf) |
768 | pt->read_buf = pt->saved_read_buf; | |
cb63cf9e | 769 | if (pt->read_buf != &pt->shortbuf) |
c6c79933 | 770 | scm_must_free (pt->read_buf); |
cb63cf9e | 771 | if (pt->write_buf != &pt->shortbuf) |
c6c79933 GH |
772 | scm_must_free (pt->write_buf); |
773 | scm_must_free ((char *) fp); | |
cb63cf9e | 774 | return rv; |
6a2c4c81 JB |
775 | } |
776 | ||
1be6b49c | 777 | static size_t |
affc96b5 | 778 | fport_free (SCM port) |
b3ec3c64 | 779 | { |
affc96b5 | 780 | fport_close (port); |
b3ec3c64 MD |
781 | return 0; |
782 | } | |
783 | ||
a98bddfd | 784 | static scm_bits_t |
b3ec3c64 MD |
785 | scm_make_fptob () |
786 | { | |
a98bddfd DH |
787 | scm_bits_t tc = scm_make_port_type ("file", fport_fill_input, fport_write); |
788 | ||
affc96b5 | 789 | scm_set_port_free (tc, fport_free); |
e841c3e0 | 790 | scm_set_port_print (tc, fport_print); |
affc96b5 GH |
791 | scm_set_port_flush (tc, fport_flush); |
792 | scm_set_port_end_input (tc, fport_end_input); | |
793 | scm_set_port_close (tc, fport_close); | |
794 | scm_set_port_seek (tc, fport_seek); | |
795 | scm_set_port_truncate (tc, fport_truncate); | |
796 | scm_set_port_input_waiting (tc, fport_input_waiting); | |
a98bddfd DH |
797 | |
798 | return tc; | |
b3ec3c64 | 799 | } |
0f2d19dd | 800 | |
0f2d19dd JB |
801 | void |
802 | scm_init_fports () | |
0f2d19dd | 803 | { |
a98bddfd DH |
804 | scm_tc16_fport = scm_make_fptob (); |
805 | ||
86d31dfe MV |
806 | scm_c_define ("_IOFBF", SCM_MAKINUM (_IOFBF)); |
807 | scm_c_define ("_IOLBF", SCM_MAKINUM (_IOLBF)); | |
808 | scm_c_define ("_IONBF", SCM_MAKINUM (_IONBF)); | |
a98bddfd DH |
809 | |
810 | #ifndef SCM_MAGIC_SNARFER | |
811 | #include "libguile/fports.x" | |
812 | #endif | |
0f2d19dd | 813 | } |
89e00824 ML |
814 | |
815 | /* | |
816 | Local Variables: | |
817 | c-file-style: "gnu" | |
818 | End: | |
819 | */ |