Commit | Line | Data |
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b9ad392e | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002, 2003 Free Software Foundation, Inc. |
0f2d19dd | 2 | * |
73be1d9e MV |
3 | * This library is free software; you can redistribute it and/or |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
0f2d19dd | 7 | * |
73be1d9e MV |
8 | * This library is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * Lesser General Public License for more details. | |
0f2d19dd | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
16 | */ | |
1bbd0b84 | 17 | |
1bbd0b84 | 18 | |
0f2d19dd | 19 | \f |
85286595 RB |
20 | #if HAVE_CONFIG_H |
21 | # include <config.h> | |
22 | #endif | |
0f2d19dd JB |
23 | |
24 | #include <stdio.h> | |
cb63cf9e | 25 | #include <fcntl.h> |
a0599745 MD |
26 | #include "libguile/_scm.h" |
27 | #include "libguile/strings.h" | |
a0599745 | 28 | #include "libguile/validate.h" |
6b72ac1d GH |
29 | #include "libguile/gc.h" |
30 | ||
a0599745 | 31 | #include "libguile/fports.h" |
95b88819 GH |
32 | |
33 | #ifdef HAVE_STRING_H | |
34 | #include <string.h> | |
35 | #endif | |
0f2d19dd JB |
36 | #ifdef HAVE_UNISTD_H |
37 | #include <unistd.h> | |
38 | #else | |
1be6b49c | 39 | size_t fwrite (); |
0f2d19dd | 40 | #endif |
b8b17bfd MV |
41 | #ifdef HAVE_IO_H |
42 | #include <io.h> | |
43 | #endif | |
f47a5239 | 44 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
cb63cf9e JB |
45 | #include <sys/stat.h> |
46 | #endif | |
0f2d19dd | 47 | |
cb63cf9e | 48 | #include <errno.h> |
e145dd02 | 49 | |
a0599745 | 50 | #include "libguile/iselect.h" |
edb810bb SJ |
51 | |
52 | /* Some defines for Windows (native port, not Cygwin). */ | |
82893676 MG |
53 | #ifdef __MINGW32__ |
54 | # include <sys/stat.h> | |
55 | # include <winsock2.h> | |
56 | # define ftruncate(fd, size) chsize (fd, size) | |
57 | #endif /* __MINGW32__ */ | |
cb63cf9e | 58 | |
a98bddfd | 59 | |
92c2555f | 60 | scm_t_bits scm_tc16_fport; |
a98bddfd DH |
61 | |
62 | ||
19b27fa2 | 63 | /* default buffer size, used if the O/S won't supply a value. */ |
1be6b49c | 64 | static const size_t default_buffer_size = 1024; |
19b27fa2 | 65 | |
cb63cf9e JB |
66 | /* create FPORT buffer with specified sizes (or -1 to use default size or |
67 | 0 for no buffer. */ | |
68 | static void | |
c014a02e | 69 | scm_fport_buffer_add (SCM port, long read_size, int write_size) |
c6c79933 | 70 | #define FUNC_NAME "scm_fport_buffer_add" |
e145dd02 | 71 | { |
92c2555f | 72 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
e145dd02 | 73 | |
cb63cf9e JB |
74 | if (read_size == -1 || write_size == -1) |
75 | { | |
1be6b49c | 76 | size_t default_size; |
f47a5239 | 77 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
cb63cf9e | 78 | struct stat st; |
b8b17bfd | 79 | scm_t_fport *fp = SCM_FSTREAM (port); |
cb63cf9e | 80 | |
19b27fa2 GH |
81 | default_size = (fstat (fp->fdes, &st) == -1) ? default_buffer_size |
82 | : st.st_blksize; | |
cb63cf9e | 83 | #else |
19b27fa2 | 84 | default_size = default_buffer_size; |
cb63cf9e JB |
85 | #endif |
86 | if (read_size == -1) | |
87 | read_size = default_size; | |
88 | if (write_size == -1) | |
89 | write_size = default_size; | |
90 | } | |
0f2d19dd | 91 | |
f5f2dcff | 92 | if (SCM_INPUT_PORT_P (port) && read_size > 0) |
cb63cf9e | 93 | { |
4c9419ac | 94 | pt->read_buf = scm_gc_malloc (read_size, "port buffer"); |
cb63cf9e JB |
95 | pt->read_pos = pt->read_end = pt->read_buf; |
96 | pt->read_buf_size = read_size; | |
97 | } | |
98 | else | |
99 | { | |
840ae05d | 100 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; |
cb63cf9e JB |
101 | pt->read_buf_size = 1; |
102 | } | |
1717856b | 103 | |
f5f2dcff | 104 | if (SCM_OUTPUT_PORT_P (port) && write_size > 0) |
cb63cf9e | 105 | { |
4c9419ac | 106 | pt->write_buf = scm_gc_malloc (write_size, "port buffer"); |
cb63cf9e JB |
107 | pt->write_pos = pt->write_buf; |
108 | pt->write_buf_size = write_size; | |
109 | } | |
110 | else | |
111 | { | |
112 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
113 | pt->write_buf_size = 1; | |
114 | } | |
115 | ||
116 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
117 | if (read_size > 0 || write_size > 0) | |
54778cd3 | 118 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0); |
cb63cf9e | 119 | else |
54778cd3 | 120 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUF0); |
7a6f1ffa | 121 | } |
c6c79933 | 122 | #undef FUNC_NAME |
7a6f1ffa | 123 | |
a1ec6916 | 124 | SCM_DEFINE (scm_setvbuf, "setvbuf", 2, 1, 0, |
1bbd0b84 | 125 | (SCM port, SCM mode, SCM size), |
fc0d72d4 MD |
126 | "Set the buffering mode for @var{port}. @var{mode} can be:\n" |
127 | "@table @code\n" | |
128 | "@item _IONBF\n" | |
129 | "non-buffered\n" | |
130 | "@item _IOLBF\n" | |
131 | "line buffered\n" | |
132 | "@item _IOFBF\n" | |
133 | "block buffered, using a newly allocated buffer of @var{size} bytes.\n" | |
134 | "If @var{size} is omitted, a default size will be used.\n" | |
2c1ae20e | 135 | "@end table") |
1bbd0b84 | 136 | #define FUNC_NAME s_scm_setvbuf |
7a6f1ffa | 137 | { |
1be6b49c | 138 | int cmode; |
c014a02e | 139 | long csize; |
92c2555f | 140 | scm_t_port *pt; |
7a6f1ffa | 141 | |
78446828 MV |
142 | port = SCM_COERCE_OUTPORT (port); |
143 | ||
3b3b36dd GB |
144 | SCM_VALIDATE_OPFPORT (1,port); |
145 | SCM_VALIDATE_INUM_COPY (2,mode,cmode); | |
d3639214 | 146 | if (cmode != _IONBF && cmode != _IOFBF && cmode != _IOLBF) |
1bbd0b84 | 147 | scm_out_of_range (FUNC_NAME, mode); |
d3639214 GH |
148 | |
149 | if (cmode == _IOLBF) | |
150 | { | |
54778cd3 | 151 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUFLINE); |
d3639214 GH |
152 | cmode = _IOFBF; |
153 | } | |
154 | else | |
155 | { | |
54778cd3 | 156 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) ^ SCM_BUFLINE); |
d3639214 GH |
157 | } |
158 | ||
7a6f1ffa | 159 | if (SCM_UNBNDP (size)) |
cb63cf9e JB |
160 | { |
161 | if (cmode == _IOFBF) | |
162 | csize = -1; | |
163 | else | |
164 | csize = 0; | |
165 | } | |
7a6f1ffa GH |
166 | else |
167 | { | |
3b3b36dd | 168 | SCM_VALIDATE_INUM_COPY (3,size,csize); |
cb63cf9e | 169 | if (csize < 0 || (cmode == _IONBF && csize > 0)) |
1bbd0b84 | 170 | scm_out_of_range (FUNC_NAME, size); |
7a6f1ffa | 171 | } |
d3639214 | 172 | |
cb63cf9e | 173 | pt = SCM_PTAB_ENTRY (port); |
7a6f1ffa | 174 | |
4c9419ac MV |
175 | /* silently discards buffered and put-back chars. */ |
176 | if (pt->read_buf == pt->putback_buf) | |
177 | { | |
178 | pt->read_buf = pt->saved_read_buf; | |
179 | pt->read_pos = pt->saved_read_pos; | |
180 | pt->read_end = pt->saved_read_end; | |
181 | pt->read_buf_size = pt->saved_read_buf_size; | |
182 | } | |
cb63cf9e | 183 | if (pt->read_buf != &pt->shortbuf) |
4c9419ac | 184 | scm_gc_free (pt->read_buf, pt->read_buf_size, "port buffer"); |
cb63cf9e | 185 | if (pt->write_buf != &pt->shortbuf) |
4c9419ac | 186 | scm_gc_free (pt->write_buf, pt->write_buf_size, "port buffer"); |
7a6f1ffa | 187 | |
cb63cf9e JB |
188 | scm_fport_buffer_add (port, csize, csize); |
189 | return SCM_UNSPECIFIED; | |
0f2d19dd | 190 | } |
1bbd0b84 | 191 | #undef FUNC_NAME |
0f2d19dd | 192 | |
eadd48de | 193 | /* Move ports with the specified file descriptor to new descriptors, |
387d418c | 194 | * resetting the revealed count to 0. |
0f2d19dd | 195 | */ |
1717856b | 196 | |
eadd48de | 197 | void |
6e8d25a6 | 198 | scm_evict_ports (int fd) |
0f2d19dd | 199 | { |
c014a02e | 200 | long i; |
0f2d19dd | 201 | |
b9ad392e MD |
202 | scm_mutex_lock (&scm_i_port_table_mutex); |
203 | ||
67329a9e | 204 | for (i = 0; i < scm_i_port_table_size; i++) |
eadd48de | 205 | { |
67329a9e | 206 | SCM port = scm_i_port_table[i]->port; |
cb63cf9e JB |
207 | |
208 | if (SCM_FPORTP (port)) | |
eadd48de | 209 | { |
92c2555f | 210 | scm_t_fport *fp = SCM_FSTREAM (port); |
cb63cf9e JB |
211 | |
212 | if (fp->fdes == fd) | |
213 | { | |
214 | fp->fdes = dup (fd); | |
215 | if (fp->fdes == -1) | |
216 | scm_syserror ("scm_evict_ports"); | |
93ccaef0 | 217 | scm_set_port_revealed_x (port, SCM_I_MAKINUM (0)); |
cb63cf9e | 218 | } |
eadd48de GH |
219 | } |
220 | } | |
b9ad392e MD |
221 | |
222 | scm_mutex_unlock (&scm_i_port_table_mutex); | |
eadd48de | 223 | } |
0f2d19dd | 224 | |
efa40607 DH |
225 | |
226 | SCM_DEFINE (scm_file_port_p, "file-port?", 1, 0, 0, | |
227 | (SCM obj), | |
2069af38 | 228 | "Determine whether @var{obj} is a port that is related to a file.") |
efa40607 DH |
229 | #define FUNC_NAME s_scm_file_port_p |
230 | { | |
7888309b | 231 | return scm_from_bool (SCM_FPORTP (obj)); |
efa40607 DH |
232 | } |
233 | #undef FUNC_NAME | |
234 | ||
235 | ||
0f2d19dd JB |
236 | /* scm_open_file |
237 | * Return a new port open on a given file. | |
238 | * | |
239 | * The mode string must match the pattern: [rwa+]** which | |
240 | * is interpreted in the usual unix way. | |
241 | * | |
242 | * Return the new port. | |
243 | */ | |
3b3b36dd | 244 | SCM_DEFINE (scm_open_file, "open-file", 2, 0, 0, |
1e6808ea MG |
245 | (SCM filename, SCM mode), |
246 | "Open the file whose name is @var{filename}, and return a port\n" | |
fc0d72d4 | 247 | "representing that file. The attributes of the port are\n" |
1e6808ea MG |
248 | "determined by the @var{mode} string. The way in which this is\n" |
249 | "interpreted is similar to C stdio. The first character must be\n" | |
250 | "one of the following:\n" | |
fc0d72d4 MD |
251 | "@table @samp\n" |
252 | "@item r\n" | |
253 | "Open an existing file for input.\n" | |
254 | "@item w\n" | |
255 | "Open a file for output, creating it if it doesn't already exist\n" | |
256 | "or removing its contents if it does.\n" | |
257 | "@item a\n" | |
1e6808ea MG |
258 | "Open a file for output, creating it if it doesn't already\n" |
259 | "exist. All writes to the port will go to the end of the file.\n" | |
fc0d72d4 MD |
260 | "The \"append mode\" can be turned off while the port is in use\n" |
261 | "@pxref{Ports and File Descriptors, fcntl}\n" | |
1e6808ea MG |
262 | "@end table\n" |
263 | "The following additional characters can be appended:\n" | |
fc0d72d4 MD |
264 | "@table @samp\n" |
265 | "@item +\n" | |
266 | "Open the port for both input and output. E.g., @code{r+}: open\n" | |
267 | "an existing file for both input and output.\n" | |
268 | "@item 0\n" | |
1e6808ea MG |
269 | "Create an \"unbuffered\" port. In this case input and output\n" |
270 | "operations are passed directly to the underlying port\n" | |
271 | "implementation without additional buffering. This is likely to\n" | |
272 | "slow down I/O operations. The buffering mode can be changed\n" | |
273 | "while a port is in use @pxref{Ports and File Descriptors,\n" | |
274 | "setvbuf}\n" | |
fc0d72d4 MD |
275 | "@item l\n" |
276 | "Add line-buffering to the port. The port output buffer will be\n" | |
277 | "automatically flushed whenever a newline character is written.\n" | |
1e6808ea MG |
278 | "@end table\n" |
279 | "In theory we could create read/write ports which were buffered\n" | |
280 | "in one direction only. However this isn't included in the\n" | |
281 | "current interfaces. If a file cannot be opened with the access\n" | |
282 | "requested, @code{open-file} throws an exception.") | |
1bbd0b84 | 283 | #define FUNC_NAME s_scm_open_file |
0f2d19dd | 284 | { |
19639113 | 285 | SCM port; |
cb63cf9e JB |
286 | int fdes; |
287 | int flags = 0; | |
19639113 | 288 | char *file; |
1e6808ea | 289 | char *md; |
cb63cf9e | 290 | char *ptr; |
19639113 | 291 | |
a6d9e5ab | 292 | SCM_VALIDATE_STRING (1, filename); |
1e6808ea | 293 | SCM_VALIDATE_STRING (2, mode); |
19639113 | 294 | |
a6d9e5ab | 295 | file = SCM_STRING_CHARS (filename); |
1e6808ea | 296 | md = SCM_STRING_CHARS (mode); |
19639113 | 297 | |
1e6808ea | 298 | switch (*md) |
0f2d19dd | 299 | { |
cb63cf9e JB |
300 | case 'r': |
301 | flags |= O_RDONLY; | |
302 | break; | |
303 | case 'w': | |
304 | flags |= O_WRONLY | O_CREAT | O_TRUNC; | |
305 | break; | |
306 | case 'a': | |
307 | flags |= O_WRONLY | O_CREAT | O_APPEND; | |
308 | break; | |
309 | default: | |
1e6808ea | 310 | scm_out_of_range (FUNC_NAME, mode); |
0f2d19dd | 311 | } |
1e6808ea | 312 | ptr = md + 1; |
cb63cf9e | 313 | while (*ptr != '\0') |
e145dd02 | 314 | { |
cb63cf9e JB |
315 | switch (*ptr) |
316 | { | |
317 | case '+': | |
318 | flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR; | |
319 | break; | |
9f561420 GH |
320 | case 'b': |
321 | #if defined (O_BINARY) | |
322 | flags |= O_BINARY; | |
323 | #endif | |
324 | break; | |
cb63cf9e | 325 | case '0': /* unbuffered: handled later. */ |
d3639214 | 326 | case 'l': /* line buffered: handled during output. */ |
cb63cf9e JB |
327 | break; |
328 | default: | |
1e6808ea | 329 | scm_out_of_range (FUNC_NAME, mode); |
cb63cf9e JB |
330 | } |
331 | ptr++; | |
e145dd02 | 332 | } |
cb63cf9e JB |
333 | SCM_SYSCALL (fdes = open (file, flags, 0666)); |
334 | if (fdes == -1) | |
e145dd02 | 335 | { |
cb63cf9e JB |
336 | int en = errno; |
337 | ||
5d2d2ffc | 338 | SCM_SYSERROR_MSG ("~A: ~S", |
cb63cf9e | 339 | scm_cons (scm_makfrom0str (strerror (en)), |
5d2d2ffc | 340 | scm_cons (filename, SCM_EOL)), en); |
0f2d19dd | 341 | } |
1e6808ea | 342 | port = scm_fdes_to_port (fdes, md, filename); |
0f2d19dd JB |
343 | return port; |
344 | } | |
1bbd0b84 | 345 | #undef FUNC_NAME |
0f2d19dd | 346 | |
e145dd02 | 347 | \f |
82893676 MG |
348 | #ifdef __MINGW32__ |
349 | /* | |
350 | * Try getting the appropiate file flags for a given file descriptor | |
351 | * under Windows. This incorporates some fancy operations because Windows | |
352 | * differentiates between file, pipe and socket descriptors. | |
353 | */ | |
354 | #ifndef O_ACCMODE | |
355 | # define O_ACCMODE 0x0003 | |
356 | #endif | |
357 | ||
358 | static int getflags (int fdes) | |
359 | { | |
360 | int flags = 0; | |
361 | struct stat buf; | |
362 | int error, optlen = sizeof (int); | |
363 | ||
364 | /* Is this a socket ? */ | |
365 | if (getsockopt (fdes, SOL_SOCKET, SO_ERROR, (void *) &error, &optlen) >= 0) | |
366 | flags = O_RDWR; | |
367 | /* Maybe a regular file ? */ | |
368 | else if (fstat (fdes, &buf) < 0) | |
369 | flags = -1; | |
370 | else | |
371 | { | |
372 | /* Or an anonymous pipe handle ? */ | |
b8b17bfd | 373 | if (buf.st_mode & _S_IFIFO) |
8f99e3f3 SJ |
374 | flags = PeekNamedPipe ((HANDLE) _get_osfhandle (fdes), NULL, 0, |
375 | NULL, NULL, NULL) ? O_RDONLY : O_WRONLY; | |
82893676 | 376 | /* stdin ? */ |
b8b17bfd | 377 | else if (fdes == fileno (stdin) && isatty (fdes)) |
82893676 MG |
378 | flags = O_RDONLY; |
379 | /* stdout / stderr ? */ | |
b8b17bfd MV |
380 | else if ((fdes == fileno (stdout) || fdes == fileno (stderr)) && |
381 | isatty (fdes)) | |
82893676 MG |
382 | flags = O_WRONLY; |
383 | else | |
384 | flags = buf.st_mode; | |
385 | } | |
386 | return flags; | |
387 | } | |
388 | #endif /* __MINGW32__ */ | |
389 | ||
cb63cf9e | 390 | /* Building Guile ports from a file descriptor. */ |
e145dd02 | 391 | |
cb63cf9e | 392 | /* Build a Scheme port from an open file descriptor `fdes'. |
a089567e JB |
393 | MODE indicates whether FILE is open for reading or writing; it uses |
394 | the same notation as open-file's second argument. | |
19b27fa2 GH |
395 | NAME is a string to be used as the port's filename. |
396 | */ | |
a089567e | 397 | SCM |
cb63cf9e | 398 | scm_fdes_to_port (int fdes, char *mode, SCM name) |
19b27fa2 | 399 | #define FUNC_NAME "scm_fdes_to_port" |
a089567e JB |
400 | { |
401 | long mode_bits = scm_mode_bits (mode); | |
402 | SCM port; | |
92c2555f | 403 | scm_t_port *pt; |
19b27fa2 GH |
404 | int flags; |
405 | ||
406 | /* test that fdes is valid. */ | |
82893676 MG |
407 | #ifdef __MINGW32__ |
408 | flags = getflags (fdes); | |
409 | #else | |
19b27fa2 | 410 | flags = fcntl (fdes, F_GETFL, 0); |
82893676 | 411 | #endif |
19b27fa2 GH |
412 | if (flags == -1) |
413 | SCM_SYSERROR; | |
414 | flags &= O_ACCMODE; | |
415 | if (flags != O_RDWR | |
416 | && ((flags != O_WRONLY && (mode_bits & SCM_WRTNG)) | |
417 | || (flags != O_RDONLY && (mode_bits & SCM_RDNG)))) | |
418 | { | |
419 | SCM_MISC_ERROR ("requested file mode not available on fdes", SCM_EOL); | |
420 | } | |
a089567e | 421 | |
b9ad392e | 422 | scm_mutex_lock (&scm_i_port_table_mutex); |
da220f27 HWN |
423 | |
424 | port = scm_new_port_table_entry (scm_tc16_fport); | |
425 | SCM_SET_CELL_TYPE(port, scm_tc16_fport | mode_bits); | |
426 | pt = SCM_PTAB_ENTRY(port); | |
a089567e | 427 | { |
92c2555f | 428 | scm_t_fport *fp |
4c9419ac | 429 | = (scm_t_fport *) scm_gc_malloc (sizeof (scm_t_fport), "file port"); |
c6c79933 | 430 | |
cb63cf9e | 431 | fp->fdes = fdes; |
0de97b83 | 432 | pt->rw_random = SCM_FDES_RANDOM_P (fdes); |
cb63cf9e JB |
433 | SCM_SETSTREAM (port, fp); |
434 | if (mode_bits & SCM_BUF0) | |
435 | scm_fport_buffer_add (port, 0, 0); | |
436 | else | |
437 | scm_fport_buffer_add (port, -1, -1); | |
a089567e | 438 | } |
b24b5e13 | 439 | SCM_SET_FILENAME (port, name); |
b9ad392e | 440 | scm_mutex_unlock (&scm_i_port_table_mutex); |
e145dd02 JB |
441 | return port; |
442 | } | |
19b27fa2 | 443 | #undef FUNC_NAME |
e145dd02 | 444 | |
affc96b5 | 445 | /* Return a lower bound on the number of bytes available for input. */ |
cb63cf9e | 446 | static int |
affc96b5 | 447 | fport_input_waiting (SCM port) |
e145dd02 | 448 | { |
cb63cf9e JB |
449 | int fdes = SCM_FSTREAM (port)->fdes; |
450 | ||
451 | #ifdef HAVE_SELECT | |
452 | struct timeval timeout; | |
453 | SELECT_TYPE read_set; | |
454 | SELECT_TYPE write_set; | |
455 | SELECT_TYPE except_set; | |
456 | ||
457 | FD_ZERO (&read_set); | |
458 | FD_ZERO (&write_set); | |
459 | FD_ZERO (&except_set); | |
460 | ||
461 | FD_SET (fdes, &read_set); | |
462 | ||
463 | timeout.tv_sec = 0; | |
464 | timeout.tv_usec = 0; | |
465 | ||
466 | if (select (SELECT_SET_SIZE, | |
467 | &read_set, &write_set, &except_set, &timeout) | |
468 | < 0) | |
affc96b5 GH |
469 | scm_syserror ("fport_input_waiting"); |
470 | return FD_ISSET (fdes, &read_set) ? 1 : 0; | |
cb63cf9e JB |
471 | #elif defined (FIONREAD) |
472 | int remir; | |
473 | ioctl(fdes, FIONREAD, &remir); | |
474 | return remir; | |
475 | #else | |
affc96b5 | 476 | scm_misc_error ("fport_input_waiting", |
cb63cf9e JB |
477 | "Not fully implemented on this platform", |
478 | SCM_EOL); | |
479 | #endif | |
a089567e JB |
480 | } |
481 | ||
cb63cf9e | 482 | \f |
0f2d19dd | 483 | static int |
e81d98ec | 484 | fport_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) |
0f2d19dd | 485 | { |
b3ec3c64 MD |
486 | scm_puts ("#<", port); |
487 | scm_print_port_mode (exp, port); | |
488 | if (SCM_OPFPORTP (exp)) | |
0f2d19dd | 489 | { |
b3ec3c64 | 490 | int fdes; |
b24b5e13 DH |
491 | SCM name = SCM_FILENAME (exp); |
492 | if (SCM_STRINGP (name) || SCM_SYMBOLP (name)) | |
493 | scm_display (name, port); | |
494 | else | |
495 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); | |
b3ec3c64 MD |
496 | scm_putc (' ', port); |
497 | fdes = (SCM_FSTREAM (exp))->fdes; | |
498 | ||
82893676 | 499 | #ifdef HAVE_TTYNAME |
b3ec3c64 MD |
500 | if (isatty (fdes)) |
501 | scm_puts (ttyname (fdes), port); | |
502 | else | |
82893676 | 503 | #endif /* HAVE_TTYNAME */ |
b3ec3c64 | 504 | scm_intprint (fdes, 10, port); |
0f2d19dd JB |
505 | } |
506 | else | |
507 | { | |
b3ec3c64 MD |
508 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); |
509 | scm_putc (' ', port); | |
63bcad19 | 510 | scm_intprint ((scm_t_bits) SCM_PTAB_ENTRY (exp), 16, port); |
0f2d19dd | 511 | } |
b3ec3c64 MD |
512 | scm_putc ('>', port); |
513 | return 1; | |
0f2d19dd JB |
514 | } |
515 | ||
2e945bcc | 516 | #ifndef __MINGW32__ |
cb63cf9e JB |
517 | /* thread-local block for input on fport's fdes. */ |
518 | static void | |
519 | fport_wait_for_input (SCM port) | |
3cb988bd | 520 | { |
cb63cf9e | 521 | int fdes = SCM_FSTREAM (port)->fdes; |
3cb988bd | 522 | |
affc96b5 | 523 | if (!fport_input_waiting (port)) |
8122b543 | 524 | { |
cb63cf9e JB |
525 | int n; |
526 | SELECT_TYPE readfds; | |
527 | int flags = fcntl (fdes, F_GETFL); | |
528 | ||
529 | if (flags == -1) | |
530 | scm_syserror ("scm_fdes_wait_for_input"); | |
531 | if (!(flags & O_NONBLOCK)) | |
532 | do | |
533 | { | |
534 | FD_ZERO (&readfds); | |
535 | FD_SET (fdes, &readfds); | |
536 | n = scm_internal_select (fdes + 1, &readfds, NULL, NULL, NULL); | |
537 | } | |
538 | while (n == -1 && errno == EINTR); | |
8122b543 | 539 | } |
3cb988bd | 540 | } |
2e945bcc | 541 | #endif /* !__MINGW32__ */ |
0f2d19dd | 542 | |
affc96b5 | 543 | static void fport_flush (SCM port); |
0f2d19dd | 544 | |
c2da2648 GH |
545 | /* fill a port's read-buffer with a single read. returns the first |
546 | char or EOF if end of file. */ | |
0f2d19dd | 547 | static int |
affc96b5 | 548 | fport_fill_input (SCM port) |
0f2d19dd | 549 | { |
c014a02e | 550 | long count; |
92c2555f MV |
551 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
552 | scm_t_fport *fp = SCM_FSTREAM (port); | |
cb63cf9e | 553 | |
2e945bcc | 554 | #ifndef __MINGW32__ |
cb63cf9e | 555 | fport_wait_for_input (port); |
2e945bcc | 556 | #endif /* !__MINGW32__ */ |
cb63cf9e JB |
557 | SCM_SYSCALL (count = read (fp->fdes, pt->read_buf, pt->read_buf_size)); |
558 | if (count == -1) | |
affc96b5 | 559 | scm_syserror ("fport_fill_input"); |
cb63cf9e JB |
560 | if (count == 0) |
561 | return EOF; | |
562 | else | |
563 | { | |
5c070ca7 | 564 | pt->read_pos = pt->read_buf; |
cb63cf9e | 565 | pt->read_end = pt->read_buf + count; |
5c070ca7 | 566 | return *pt->read_buf; |
cb63cf9e | 567 | } |
0f2d19dd JB |
568 | } |
569 | ||
cb63cf9e | 570 | static off_t |
affc96b5 | 571 | fport_seek (SCM port, off_t offset, int whence) |
0f2d19dd | 572 | { |
92c2555f MV |
573 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
574 | scm_t_fport *fp = SCM_FSTREAM (port); | |
7dcb364d GH |
575 | off_t rv; |
576 | off_t result; | |
577 | ||
578 | if (pt->rw_active == SCM_PORT_WRITE) | |
579 | { | |
580 | if (offset != 0 || whence != SEEK_CUR) | |
581 | { | |
582 | fport_flush (port); | |
583 | result = rv = lseek (fp->fdes, offset, whence); | |
584 | } | |
585 | else | |
586 | { | |
587 | /* read current position without disturbing the buffer. */ | |
588 | rv = lseek (fp->fdes, offset, whence); | |
589 | result = rv + (pt->write_pos - pt->write_buf); | |
590 | } | |
591 | } | |
592 | else if (pt->rw_active == SCM_PORT_READ) | |
593 | { | |
594 | if (offset != 0 || whence != SEEK_CUR) | |
595 | { | |
596 | /* could expand to avoid a second seek. */ | |
597 | scm_end_input (port); | |
598 | result = rv = lseek (fp->fdes, offset, whence); | |
599 | } | |
600 | else | |
601 | { | |
602 | /* read current position without disturbing the buffer | |
603 | (particularly the unread-char buffer). */ | |
604 | rv = lseek (fp->fdes, offset, whence); | |
605 | result = rv - (pt->read_end - pt->read_pos); | |
606 | ||
607 | if (pt->read_buf == pt->putback_buf) | |
608 | result -= pt->saved_read_end - pt->saved_read_pos; | |
609 | } | |
610 | } | |
611 | else /* SCM_PORT_NEITHER */ | |
612 | { | |
613 | result = rv = lseek (fp->fdes, offset, whence); | |
614 | } | |
cb8dfa3f | 615 | |
7dcb364d | 616 | if (rv == -1) |
affc96b5 | 617 | scm_syserror ("fport_seek"); |
7dcb364d | 618 | |
cb8dfa3f | 619 | return result; |
0f2d19dd JB |
620 | } |
621 | ||
840ae05d | 622 | static void |
affc96b5 | 623 | fport_truncate (SCM port, off_t length) |
840ae05d | 624 | { |
92c2555f | 625 | scm_t_fport *fp = SCM_FSTREAM (port); |
840ae05d JB |
626 | |
627 | if (ftruncate (fp->fdes, length) == -1) | |
628 | scm_syserror ("ftruncate"); | |
629 | } | |
630 | ||
0c6d2191 GH |
631 | /* helper for fport_write: try to write data, using multiple system |
632 | calls if required. */ | |
633 | #define FUNC_NAME "write_all" | |
634 | static void write_all (SCM port, const void *data, size_t remaining) | |
635 | { | |
636 | int fdes = SCM_FSTREAM (port)->fdes; | |
637 | ||
638 | while (remaining > 0) | |
639 | { | |
82893676 | 640 | size_t done; |
0c6d2191 GH |
641 | |
642 | SCM_SYSCALL (done = write (fdes, data, remaining)); | |
643 | ||
644 | if (done == -1) | |
645 | SCM_SYSERROR; | |
646 | remaining -= done; | |
647 | data = ((const char *) data) + done; | |
648 | } | |
649 | } | |
650 | #undef FUNC_NAME | |
651 | ||
31703ab8 | 652 | static void |
8aa011a1 | 653 | fport_write (SCM port, const void *data, size_t size) |
31703ab8 | 654 | { |
0c6d2191 | 655 | /* this procedure tries to minimize the number of writes/flushes. */ |
92c2555f | 656 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
31703ab8 | 657 | |
0c6d2191 GH |
658 | if (pt->write_buf == &pt->shortbuf |
659 | || (pt->write_pos == pt->write_buf && size >= pt->write_buf_size)) | |
31703ab8 | 660 | { |
0c6d2191 GH |
661 | /* "unbuffered" port, or |
662 | port with empty buffer and data won't fit in buffer. */ | |
663 | write_all (port, data, size); | |
664 | return; | |
31703ab8 | 665 | } |
d3639214 | 666 | |
0c6d2191 GH |
667 | { |
668 | off_t space = pt->write_end - pt->write_pos; | |
669 | ||
670 | if (size <= space) | |
671 | { | |
672 | /* data fits in buffer. */ | |
673 | memcpy (pt->write_pos, data, size); | |
674 | pt->write_pos += size; | |
675 | if (pt->write_pos == pt->write_end) | |
676 | { | |
affc96b5 | 677 | fport_flush (port); |
0c6d2191 GH |
678 | /* we can skip the line-buffering check if nothing's buffered. */ |
679 | return; | |
680 | } | |
681 | } | |
682 | else | |
683 | { | |
684 | memcpy (pt->write_pos, data, space); | |
685 | pt->write_pos = pt->write_end; | |
686 | fport_flush (port); | |
687 | { | |
688 | const void *ptr = ((const char *) data) + space; | |
689 | size_t remaining = size - space; | |
690 | ||
691 | if (size >= pt->write_buf_size) | |
692 | { | |
693 | write_all (port, ptr, remaining); | |
694 | return; | |
695 | } | |
696 | else | |
697 | { | |
698 | memcpy (pt->write_pos, ptr, remaining); | |
699 | pt->write_pos += remaining; | |
700 | } | |
31703ab8 | 701 | } |
0c6d2191 | 702 | } |
31703ab8 | 703 | |
0c6d2191 GH |
704 | /* handle line buffering. */ |
705 | if ((SCM_CELL_WORD_0 (port) & SCM_BUFLINE) && memchr (data, '\n', size)) | |
706 | fport_flush (port); | |
707 | } | |
31703ab8 GH |
708 | } |
709 | ||
710 | /* becomes 1 when process is exiting: normal exception handling won't | |
711 | work by this time. */ | |
04a98cff | 712 | extern int scm_i_terminating; |
0f2d19dd | 713 | |
cb63cf9e | 714 | static void |
affc96b5 | 715 | fport_flush (SCM port) |
0f2d19dd | 716 | { |
92c2555f MV |
717 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
718 | scm_t_fport *fp = SCM_FSTREAM (port); | |
6f760c1d | 719 | unsigned char *ptr = pt->write_buf; |
c014a02e ML |
720 | long init_size = pt->write_pos - pt->write_buf; |
721 | long remaining = init_size; | |
0f2d19dd | 722 | |
cb63cf9e JB |
723 | while (remaining > 0) |
724 | { | |
c014a02e | 725 | long count; |
cb63cf9e JB |
726 | |
727 | SCM_SYSCALL (count = write (fp->fdes, ptr, remaining)); | |
728 | if (count < 0) | |
729 | { | |
730 | /* error. assume nothing was written this call, but | |
731 | fix up the buffer for any previous successful writes. */ | |
c014a02e | 732 | long done = init_size - remaining; |
cb63cf9e JB |
733 | |
734 | if (done > 0) | |
735 | { | |
736 | int i; | |
737 | ||
738 | for (i = 0; i < remaining; i++) | |
739 | { | |
740 | *(pt->write_buf + i) = *(pt->write_buf + done + i); | |
741 | } | |
742 | pt->write_pos = pt->write_buf + remaining; | |
743 | } | |
04a98cff | 744 | if (scm_i_terminating) |
cb63cf9e JB |
745 | { |
746 | const char *msg = "Error: could not flush file-descriptor "; | |
747 | char buf[11]; | |
748 | ||
749 | write (2, msg, strlen (msg)); | |
750 | sprintf (buf, "%d\n", fp->fdes); | |
751 | write (2, buf, strlen (buf)); | |
752 | ||
753 | count = remaining; | |
754 | } | |
6b72ac1d GH |
755 | else if (scm_gc_running_p) |
756 | { | |
757 | /* silently ignore the error. scm_error would abort if we | |
758 | called it now. */ | |
759 | count = remaining; | |
760 | } | |
761 | else | |
762 | scm_syserror ("fport_flush"); | |
cb63cf9e JB |
763 | } |
764 | ptr += count; | |
765 | remaining -= count; | |
766 | } | |
767 | pt->write_pos = pt->write_buf; | |
61e452ba | 768 | pt->rw_active = SCM_PORT_NEITHER; |
840ae05d JB |
769 | } |
770 | ||
283a1a0e | 771 | /* clear the read buffer and adjust the file position for unread bytes. */ |
840ae05d | 772 | static void |
affc96b5 | 773 | fport_end_input (SCM port, int offset) |
840ae05d | 774 | { |
92c2555f MV |
775 | scm_t_fport *fp = SCM_FSTREAM (port); |
776 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
283a1a0e GH |
777 | |
778 | offset += pt->read_end - pt->read_pos; | |
840ae05d | 779 | |
840ae05d JB |
780 | if (offset > 0) |
781 | { | |
782 | pt->read_pos = pt->read_end; | |
783 | /* will throw error if unread-char used at beginning of file | |
784 | then attempting to write. seems correct. */ | |
785 | if (lseek (fp->fdes, -offset, SEEK_CUR) == -1) | |
affc96b5 | 786 | scm_syserror ("fport_end_input"); |
840ae05d | 787 | } |
61e452ba | 788 | pt->rw_active = SCM_PORT_NEITHER; |
8f29fbd0 JB |
789 | } |
790 | ||
6a2c4c81 | 791 | static int |
affc96b5 | 792 | fport_close (SCM port) |
6a2c4c81 | 793 | { |
92c2555f MV |
794 | scm_t_fport *fp = SCM_FSTREAM (port); |
795 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
cb63cf9e | 796 | int rv; |
840ae05d | 797 | |
affc96b5 | 798 | fport_flush (port); |
cb63cf9e JB |
799 | SCM_SYSCALL (rv = close (fp->fdes)); |
800 | if (rv == -1 && errno != EBADF) | |
6b72ac1d GH |
801 | { |
802 | if (scm_gc_running_p) | |
803 | /* silently ignore the error. scm_error would abort if we | |
804 | called it now. */ | |
805 | ; | |
806 | else | |
807 | scm_syserror ("fport_close"); | |
808 | } | |
6c951427 GH |
809 | if (pt->read_buf == pt->putback_buf) |
810 | pt->read_buf = pt->saved_read_buf; | |
cb63cf9e | 811 | if (pt->read_buf != &pt->shortbuf) |
4c9419ac | 812 | scm_gc_free (pt->read_buf, pt->read_buf_size, "port buffer"); |
cb63cf9e | 813 | if (pt->write_buf != &pt->shortbuf) |
4c9419ac MV |
814 | scm_gc_free (pt->write_buf, pt->write_buf_size, "port buffer"); |
815 | scm_gc_free (fp, sizeof (*fp), "file port"); | |
cb63cf9e | 816 | return rv; |
6a2c4c81 JB |
817 | } |
818 | ||
1be6b49c | 819 | static size_t |
affc96b5 | 820 | fport_free (SCM port) |
b3ec3c64 | 821 | { |
affc96b5 | 822 | fport_close (port); |
b3ec3c64 MD |
823 | return 0; |
824 | } | |
825 | ||
92c2555f | 826 | static scm_t_bits |
b3ec3c64 MD |
827 | scm_make_fptob () |
828 | { | |
92c2555f | 829 | scm_t_bits tc = scm_make_port_type ("file", fport_fill_input, fport_write); |
a98bddfd | 830 | |
affc96b5 | 831 | scm_set_port_free (tc, fport_free); |
e841c3e0 | 832 | scm_set_port_print (tc, fport_print); |
affc96b5 GH |
833 | scm_set_port_flush (tc, fport_flush); |
834 | scm_set_port_end_input (tc, fport_end_input); | |
835 | scm_set_port_close (tc, fport_close); | |
836 | scm_set_port_seek (tc, fport_seek); | |
837 | scm_set_port_truncate (tc, fport_truncate); | |
838 | scm_set_port_input_waiting (tc, fport_input_waiting); | |
a98bddfd DH |
839 | |
840 | return tc; | |
b3ec3c64 | 841 | } |
0f2d19dd | 842 | |
0f2d19dd JB |
843 | void |
844 | scm_init_fports () | |
0f2d19dd | 845 | { |
a98bddfd DH |
846 | scm_tc16_fport = scm_make_fptob (); |
847 | ||
93ccaef0 MV |
848 | scm_c_define ("_IOFBF", SCM_I_MAKINUM (_IOFBF)); |
849 | scm_c_define ("_IOLBF", SCM_I_MAKINUM (_IOLBF)); | |
850 | scm_c_define ("_IONBF", SCM_I_MAKINUM (_IONBF)); | |
a98bddfd | 851 | |
a98bddfd | 852 | #include "libguile/fports.x" |
0f2d19dd | 853 | } |
89e00824 ML |
854 | |
855 | /* | |
856 | Local Variables: | |
857 | c-file-style: "gnu" | |
858 | End: | |
859 | */ |