Commit | Line | Data |
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3d7f708f | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002 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 | 43 | \f |
85286595 RB |
44 | #if HAVE_CONFIG_H |
45 | # include <config.h> | |
46 | #endif | |
0f2d19dd JB |
47 | |
48 | #include <stdio.h> | |
cb63cf9e | 49 | #include <fcntl.h> |
a0599745 MD |
50 | #include "libguile/_scm.h" |
51 | #include "libguile/strings.h" | |
a0599745 | 52 | #include "libguile/validate.h" |
6b72ac1d GH |
53 | #include "libguile/gc.h" |
54 | ||
a0599745 | 55 | #include "libguile/fports.h" |
95b88819 GH |
56 | |
57 | #ifdef HAVE_STRING_H | |
58 | #include <string.h> | |
59 | #endif | |
0f2d19dd JB |
60 | #ifdef HAVE_UNISTD_H |
61 | #include <unistd.h> | |
62 | #else | |
1be6b49c | 63 | size_t fwrite (); |
0f2d19dd | 64 | #endif |
b8b17bfd MV |
65 | #ifdef HAVE_IO_H |
66 | #include <io.h> | |
67 | #endif | |
f47a5239 | 68 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
cb63cf9e JB |
69 | #include <sys/stat.h> |
70 | #endif | |
0f2d19dd | 71 | |
cb63cf9e | 72 | #include <errno.h> |
e145dd02 | 73 | |
a0599745 | 74 | #include "libguile/iselect.h" |
edb810bb SJ |
75 | |
76 | /* Some defines for Windows (native port, not Cygwin). */ | |
82893676 MG |
77 | #ifdef __MINGW32__ |
78 | # include <sys/stat.h> | |
79 | # include <winsock2.h> | |
80 | # define ftruncate(fd, size) chsize (fd, size) | |
81 | #endif /* __MINGW32__ */ | |
cb63cf9e | 82 | |
a98bddfd | 83 | |
92c2555f | 84 | scm_t_bits scm_tc16_fport; |
a98bddfd DH |
85 | |
86 | ||
19b27fa2 | 87 | /* default buffer size, used if the O/S won't supply a value. */ |
1be6b49c | 88 | static const size_t default_buffer_size = 1024; |
19b27fa2 | 89 | |
cb63cf9e JB |
90 | /* create FPORT buffer with specified sizes (or -1 to use default size or |
91 | 0 for no buffer. */ | |
92 | static void | |
c014a02e | 93 | scm_fport_buffer_add (SCM port, long read_size, int write_size) |
c6c79933 | 94 | #define FUNC_NAME "scm_fport_buffer_add" |
e145dd02 | 95 | { |
92c2555f | 96 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
e145dd02 | 97 | |
cb63cf9e JB |
98 | if (read_size == -1 || write_size == -1) |
99 | { | |
1be6b49c | 100 | size_t default_size; |
f47a5239 | 101 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
cb63cf9e | 102 | struct stat st; |
b8b17bfd | 103 | scm_t_fport *fp = SCM_FSTREAM (port); |
cb63cf9e | 104 | |
19b27fa2 GH |
105 | default_size = (fstat (fp->fdes, &st) == -1) ? default_buffer_size |
106 | : st.st_blksize; | |
cb63cf9e | 107 | #else |
19b27fa2 | 108 | default_size = default_buffer_size; |
cb63cf9e JB |
109 | #endif |
110 | if (read_size == -1) | |
111 | read_size = default_size; | |
112 | if (write_size == -1) | |
113 | write_size = default_size; | |
114 | } | |
0f2d19dd | 115 | |
f5f2dcff | 116 | if (SCM_INPUT_PORT_P (port) && read_size > 0) |
cb63cf9e | 117 | { |
4c9419ac | 118 | pt->read_buf = scm_gc_malloc (read_size, "port buffer"); |
cb63cf9e JB |
119 | pt->read_pos = pt->read_end = pt->read_buf; |
120 | pt->read_buf_size = read_size; | |
121 | } | |
122 | else | |
123 | { | |
840ae05d | 124 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; |
cb63cf9e JB |
125 | pt->read_buf_size = 1; |
126 | } | |
1717856b | 127 | |
f5f2dcff | 128 | if (SCM_OUTPUT_PORT_P (port) && write_size > 0) |
cb63cf9e | 129 | { |
4c9419ac | 130 | pt->write_buf = scm_gc_malloc (write_size, "port buffer"); |
cb63cf9e JB |
131 | pt->write_pos = pt->write_buf; |
132 | pt->write_buf_size = write_size; | |
133 | } | |
134 | else | |
135 | { | |
136 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
137 | pt->write_buf_size = 1; | |
138 | } | |
139 | ||
140 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
141 | if (read_size > 0 || write_size > 0) | |
54778cd3 | 142 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0); |
cb63cf9e | 143 | else |
54778cd3 | 144 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUF0); |
7a6f1ffa | 145 | } |
c6c79933 | 146 | #undef FUNC_NAME |
7a6f1ffa | 147 | |
a1ec6916 | 148 | SCM_DEFINE (scm_setvbuf, "setvbuf", 2, 1, 0, |
1bbd0b84 | 149 | (SCM port, SCM mode, SCM size), |
fc0d72d4 MD |
150 | "Set the buffering mode for @var{port}. @var{mode} can be:\n" |
151 | "@table @code\n" | |
152 | "@item _IONBF\n" | |
153 | "non-buffered\n" | |
154 | "@item _IOLBF\n" | |
155 | "line buffered\n" | |
156 | "@item _IOFBF\n" | |
157 | "block buffered, using a newly allocated buffer of @var{size} bytes.\n" | |
158 | "If @var{size} is omitted, a default size will be used.\n" | |
2c1ae20e | 159 | "@end table") |
1bbd0b84 | 160 | #define FUNC_NAME s_scm_setvbuf |
7a6f1ffa | 161 | { |
1be6b49c | 162 | int cmode; |
c014a02e | 163 | long csize; |
92c2555f | 164 | scm_t_port *pt; |
7a6f1ffa | 165 | |
78446828 MV |
166 | port = SCM_COERCE_OUTPORT (port); |
167 | ||
3b3b36dd GB |
168 | SCM_VALIDATE_OPFPORT (1,port); |
169 | SCM_VALIDATE_INUM_COPY (2,mode,cmode); | |
d3639214 | 170 | if (cmode != _IONBF && cmode != _IOFBF && cmode != _IOLBF) |
1bbd0b84 | 171 | scm_out_of_range (FUNC_NAME, mode); |
d3639214 GH |
172 | |
173 | if (cmode == _IOLBF) | |
174 | { | |
54778cd3 | 175 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUFLINE); |
d3639214 GH |
176 | cmode = _IOFBF; |
177 | } | |
178 | else | |
179 | { | |
54778cd3 | 180 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) ^ SCM_BUFLINE); |
d3639214 GH |
181 | } |
182 | ||
7a6f1ffa | 183 | if (SCM_UNBNDP (size)) |
cb63cf9e JB |
184 | { |
185 | if (cmode == _IOFBF) | |
186 | csize = -1; | |
187 | else | |
188 | csize = 0; | |
189 | } | |
7a6f1ffa GH |
190 | else |
191 | { | |
3b3b36dd | 192 | SCM_VALIDATE_INUM_COPY (3,size,csize); |
cb63cf9e | 193 | if (csize < 0 || (cmode == _IONBF && csize > 0)) |
1bbd0b84 | 194 | scm_out_of_range (FUNC_NAME, size); |
7a6f1ffa | 195 | } |
d3639214 | 196 | |
cb63cf9e | 197 | pt = SCM_PTAB_ENTRY (port); |
7a6f1ffa | 198 | |
4c9419ac MV |
199 | /* silently discards buffered and put-back chars. */ |
200 | if (pt->read_buf == pt->putback_buf) | |
201 | { | |
202 | pt->read_buf = pt->saved_read_buf; | |
203 | pt->read_pos = pt->saved_read_pos; | |
204 | pt->read_end = pt->saved_read_end; | |
205 | pt->read_buf_size = pt->saved_read_buf_size; | |
206 | } | |
cb63cf9e | 207 | if (pt->read_buf != &pt->shortbuf) |
4c9419ac | 208 | scm_gc_free (pt->read_buf, pt->read_buf_size, "port buffer"); |
cb63cf9e | 209 | if (pt->write_buf != &pt->shortbuf) |
4c9419ac | 210 | scm_gc_free (pt->write_buf, pt->write_buf_size, "port buffer"); |
7a6f1ffa | 211 | |
cb63cf9e JB |
212 | scm_fport_buffer_add (port, csize, csize); |
213 | return SCM_UNSPECIFIED; | |
0f2d19dd | 214 | } |
1bbd0b84 | 215 | #undef FUNC_NAME |
0f2d19dd | 216 | |
eadd48de | 217 | /* Move ports with the specified file descriptor to new descriptors, |
387d418c | 218 | * resetting the revealed count to 0. |
0f2d19dd | 219 | */ |
1717856b | 220 | |
eadd48de | 221 | void |
6e8d25a6 | 222 | scm_evict_ports (int fd) |
0f2d19dd | 223 | { |
c014a02e | 224 | long i; |
0f2d19dd | 225 | |
67329a9e | 226 | for (i = 0; i < scm_i_port_table_size; i++) |
eadd48de | 227 | { |
67329a9e | 228 | SCM port = scm_i_port_table[i]->port; |
cb63cf9e JB |
229 | |
230 | if (SCM_FPORTP (port)) | |
eadd48de | 231 | { |
92c2555f | 232 | scm_t_fport *fp = SCM_FSTREAM (port); |
cb63cf9e JB |
233 | |
234 | if (fp->fdes == fd) | |
235 | { | |
236 | fp->fdes = dup (fd); | |
237 | if (fp->fdes == -1) | |
238 | scm_syserror ("scm_evict_ports"); | |
239 | scm_set_port_revealed_x (port, SCM_MAKINUM (0)); | |
240 | } | |
eadd48de GH |
241 | } |
242 | } | |
243 | } | |
0f2d19dd | 244 | |
efa40607 DH |
245 | |
246 | SCM_DEFINE (scm_file_port_p, "file-port?", 1, 0, 0, | |
247 | (SCM obj), | |
2069af38 | 248 | "Determine whether @var{obj} is a port that is related to a file.") |
efa40607 DH |
249 | #define FUNC_NAME s_scm_file_port_p |
250 | { | |
251 | return SCM_BOOL (SCM_FPORTP (obj)); | |
252 | } | |
253 | #undef FUNC_NAME | |
254 | ||
255 | ||
0f2d19dd JB |
256 | /* scm_open_file |
257 | * Return a new port open on a given file. | |
258 | * | |
259 | * The mode string must match the pattern: [rwa+]** which | |
260 | * is interpreted in the usual unix way. | |
261 | * | |
262 | * Return the new port. | |
263 | */ | |
3b3b36dd | 264 | SCM_DEFINE (scm_open_file, "open-file", 2, 0, 0, |
1e6808ea MG |
265 | (SCM filename, SCM mode), |
266 | "Open the file whose name is @var{filename}, and return a port\n" | |
fc0d72d4 | 267 | "representing that file. The attributes of the port are\n" |
1e6808ea MG |
268 | "determined by the @var{mode} string. The way in which this is\n" |
269 | "interpreted is similar to C stdio. The first character must be\n" | |
270 | "one of the following:\n" | |
fc0d72d4 MD |
271 | "@table @samp\n" |
272 | "@item r\n" | |
273 | "Open an existing file for input.\n" | |
274 | "@item w\n" | |
275 | "Open a file for output, creating it if it doesn't already exist\n" | |
276 | "or removing its contents if it does.\n" | |
277 | "@item a\n" | |
1e6808ea MG |
278 | "Open a file for output, creating it if it doesn't already\n" |
279 | "exist. All writes to the port will go to the end of the file.\n" | |
fc0d72d4 MD |
280 | "The \"append mode\" can be turned off while the port is in use\n" |
281 | "@pxref{Ports and File Descriptors, fcntl}\n" | |
1e6808ea MG |
282 | "@end table\n" |
283 | "The following additional characters can be appended:\n" | |
fc0d72d4 MD |
284 | "@table @samp\n" |
285 | "@item +\n" | |
286 | "Open the port for both input and output. E.g., @code{r+}: open\n" | |
287 | "an existing file for both input and output.\n" | |
288 | "@item 0\n" | |
1e6808ea MG |
289 | "Create an \"unbuffered\" port. In this case input and output\n" |
290 | "operations are passed directly to the underlying port\n" | |
291 | "implementation without additional buffering. This is likely to\n" | |
292 | "slow down I/O operations. The buffering mode can be changed\n" | |
293 | "while a port is in use @pxref{Ports and File Descriptors,\n" | |
294 | "setvbuf}\n" | |
fc0d72d4 MD |
295 | "@item l\n" |
296 | "Add line-buffering to the port. The port output buffer will be\n" | |
297 | "automatically flushed whenever a newline character is written.\n" | |
1e6808ea MG |
298 | "@end table\n" |
299 | "In theory we could create read/write ports which were buffered\n" | |
300 | "in one direction only. However this isn't included in the\n" | |
301 | "current interfaces. If a file cannot be opened with the access\n" | |
302 | "requested, @code{open-file} throws an exception.") | |
1bbd0b84 | 303 | #define FUNC_NAME s_scm_open_file |
0f2d19dd | 304 | { |
19639113 | 305 | SCM port; |
cb63cf9e JB |
306 | int fdes; |
307 | int flags = 0; | |
19639113 | 308 | char *file; |
1e6808ea | 309 | char *md; |
cb63cf9e | 310 | char *ptr; |
19639113 | 311 | |
a6d9e5ab | 312 | SCM_VALIDATE_STRING (1, filename); |
1e6808ea | 313 | SCM_VALIDATE_STRING (2, mode); |
19639113 | 314 | |
a6d9e5ab | 315 | file = SCM_STRING_CHARS (filename); |
1e6808ea | 316 | md = SCM_STRING_CHARS (mode); |
19639113 | 317 | |
1e6808ea | 318 | switch (*md) |
0f2d19dd | 319 | { |
cb63cf9e JB |
320 | case 'r': |
321 | flags |= O_RDONLY; | |
322 | break; | |
323 | case 'w': | |
324 | flags |= O_WRONLY | O_CREAT | O_TRUNC; | |
325 | break; | |
326 | case 'a': | |
327 | flags |= O_WRONLY | O_CREAT | O_APPEND; | |
328 | break; | |
329 | default: | |
1e6808ea | 330 | scm_out_of_range (FUNC_NAME, mode); |
0f2d19dd | 331 | } |
1e6808ea | 332 | ptr = md + 1; |
cb63cf9e | 333 | while (*ptr != '\0') |
e145dd02 | 334 | { |
cb63cf9e JB |
335 | switch (*ptr) |
336 | { | |
337 | case '+': | |
338 | flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR; | |
339 | break; | |
9f561420 GH |
340 | case 'b': |
341 | #if defined (O_BINARY) | |
342 | flags |= O_BINARY; | |
343 | #endif | |
344 | break; | |
cb63cf9e | 345 | case '0': /* unbuffered: handled later. */ |
d3639214 | 346 | case 'l': /* line buffered: handled during output. */ |
cb63cf9e JB |
347 | break; |
348 | default: | |
1e6808ea | 349 | scm_out_of_range (FUNC_NAME, mode); |
cb63cf9e JB |
350 | } |
351 | ptr++; | |
e145dd02 | 352 | } |
cb63cf9e JB |
353 | SCM_SYSCALL (fdes = open (file, flags, 0666)); |
354 | if (fdes == -1) | |
e145dd02 | 355 | { |
cb63cf9e JB |
356 | int en = errno; |
357 | ||
5d2d2ffc | 358 | SCM_SYSERROR_MSG ("~A: ~S", |
cb63cf9e | 359 | scm_cons (scm_makfrom0str (strerror (en)), |
5d2d2ffc | 360 | scm_cons (filename, SCM_EOL)), en); |
0f2d19dd | 361 | } |
1e6808ea | 362 | port = scm_fdes_to_port (fdes, md, filename); |
0f2d19dd JB |
363 | return port; |
364 | } | |
1bbd0b84 | 365 | #undef FUNC_NAME |
0f2d19dd | 366 | |
e145dd02 | 367 | \f |
82893676 MG |
368 | #ifdef __MINGW32__ |
369 | /* | |
370 | * Try getting the appropiate file flags for a given file descriptor | |
371 | * under Windows. This incorporates some fancy operations because Windows | |
372 | * differentiates between file, pipe and socket descriptors. | |
373 | */ | |
374 | #ifndef O_ACCMODE | |
375 | # define O_ACCMODE 0x0003 | |
376 | #endif | |
377 | ||
378 | static int getflags (int fdes) | |
379 | { | |
380 | int flags = 0; | |
381 | struct stat buf; | |
382 | int error, optlen = sizeof (int); | |
383 | ||
384 | /* Is this a socket ? */ | |
385 | if (getsockopt (fdes, SOL_SOCKET, SO_ERROR, (void *) &error, &optlen) >= 0) | |
386 | flags = O_RDWR; | |
387 | /* Maybe a regular file ? */ | |
388 | else if (fstat (fdes, &buf) < 0) | |
389 | flags = -1; | |
390 | else | |
391 | { | |
392 | /* Or an anonymous pipe handle ? */ | |
b8b17bfd | 393 | if (buf.st_mode & _S_IFIFO) |
8f99e3f3 SJ |
394 | flags = PeekNamedPipe ((HANDLE) _get_osfhandle (fdes), NULL, 0, |
395 | NULL, NULL, NULL) ? O_RDONLY : O_WRONLY; | |
82893676 | 396 | /* stdin ? */ |
b8b17bfd | 397 | else if (fdes == fileno (stdin) && isatty (fdes)) |
82893676 MG |
398 | flags = O_RDONLY; |
399 | /* stdout / stderr ? */ | |
b8b17bfd MV |
400 | else if ((fdes == fileno (stdout) || fdes == fileno (stderr)) && |
401 | isatty (fdes)) | |
82893676 MG |
402 | flags = O_WRONLY; |
403 | else | |
404 | flags = buf.st_mode; | |
405 | } | |
406 | return flags; | |
407 | } | |
408 | #endif /* __MINGW32__ */ | |
409 | ||
cb63cf9e | 410 | /* Building Guile ports from a file descriptor. */ |
e145dd02 | 411 | |
cb63cf9e | 412 | /* Build a Scheme port from an open file descriptor `fdes'. |
a089567e JB |
413 | MODE indicates whether FILE is open for reading or writing; it uses |
414 | the same notation as open-file's second argument. | |
19b27fa2 GH |
415 | NAME is a string to be used as the port's filename. |
416 | */ | |
a089567e | 417 | SCM |
cb63cf9e | 418 | scm_fdes_to_port (int fdes, char *mode, SCM name) |
19b27fa2 | 419 | #define FUNC_NAME "scm_fdes_to_port" |
a089567e JB |
420 | { |
421 | long mode_bits = scm_mode_bits (mode); | |
422 | SCM port; | |
92c2555f | 423 | scm_t_port *pt; |
19b27fa2 GH |
424 | int flags; |
425 | ||
426 | /* test that fdes is valid. */ | |
82893676 MG |
427 | #ifdef __MINGW32__ |
428 | flags = getflags (fdes); | |
429 | #else | |
19b27fa2 | 430 | flags = fcntl (fdes, F_GETFL, 0); |
82893676 | 431 | #endif |
19b27fa2 GH |
432 | if (flags == -1) |
433 | SCM_SYSERROR; | |
434 | flags &= O_ACCMODE; | |
435 | if (flags != O_RDWR | |
436 | && ((flags != O_WRONLY && (mode_bits & SCM_WRTNG)) | |
437 | || (flags != O_RDONLY && (mode_bits & SCM_RDNG)))) | |
438 | { | |
439 | SCM_MISC_ERROR ("requested file mode not available on fdes", SCM_EOL); | |
440 | } | |
a089567e | 441 | |
a089567e | 442 | SCM_DEFER_INTS; |
da220f27 HWN |
443 | |
444 | port = scm_new_port_table_entry (scm_tc16_fport); | |
445 | SCM_SET_CELL_TYPE(port, scm_tc16_fport | mode_bits); | |
446 | pt = SCM_PTAB_ENTRY(port); | |
a089567e | 447 | { |
92c2555f | 448 | scm_t_fport *fp |
4c9419ac | 449 | = (scm_t_fport *) scm_gc_malloc (sizeof (scm_t_fport), "file port"); |
c6c79933 | 450 | |
cb63cf9e | 451 | fp->fdes = fdes; |
0de97b83 | 452 | pt->rw_random = SCM_FDES_RANDOM_P (fdes); |
cb63cf9e JB |
453 | SCM_SETSTREAM (port, fp); |
454 | if (mode_bits & SCM_BUF0) | |
455 | scm_fport_buffer_add (port, 0, 0); | |
456 | else | |
457 | scm_fport_buffer_add (port, -1, -1); | |
a089567e | 458 | } |
b24b5e13 | 459 | SCM_SET_FILENAME (port, name); |
a089567e | 460 | SCM_ALLOW_INTS; |
e145dd02 JB |
461 | return port; |
462 | } | |
19b27fa2 | 463 | #undef FUNC_NAME |
e145dd02 | 464 | |
affc96b5 | 465 | /* Return a lower bound on the number of bytes available for input. */ |
cb63cf9e | 466 | static int |
affc96b5 | 467 | fport_input_waiting (SCM port) |
e145dd02 | 468 | { |
cb63cf9e JB |
469 | int fdes = SCM_FSTREAM (port)->fdes; |
470 | ||
471 | #ifdef HAVE_SELECT | |
472 | struct timeval timeout; | |
473 | SELECT_TYPE read_set; | |
474 | SELECT_TYPE write_set; | |
475 | SELECT_TYPE except_set; | |
476 | ||
477 | FD_ZERO (&read_set); | |
478 | FD_ZERO (&write_set); | |
479 | FD_ZERO (&except_set); | |
480 | ||
481 | FD_SET (fdes, &read_set); | |
482 | ||
483 | timeout.tv_sec = 0; | |
484 | timeout.tv_usec = 0; | |
485 | ||
486 | if (select (SELECT_SET_SIZE, | |
487 | &read_set, &write_set, &except_set, &timeout) | |
488 | < 0) | |
affc96b5 GH |
489 | scm_syserror ("fport_input_waiting"); |
490 | return FD_ISSET (fdes, &read_set) ? 1 : 0; | |
cb63cf9e JB |
491 | #elif defined (FIONREAD) |
492 | int remir; | |
493 | ioctl(fdes, FIONREAD, &remir); | |
494 | return remir; | |
495 | #else | |
affc96b5 | 496 | scm_misc_error ("fport_input_waiting", |
cb63cf9e JB |
497 | "Not fully implemented on this platform", |
498 | SCM_EOL); | |
499 | #endif | |
a089567e JB |
500 | } |
501 | ||
cb63cf9e | 502 | \f |
0f2d19dd | 503 | static int |
e81d98ec | 504 | fport_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) |
0f2d19dd | 505 | { |
b3ec3c64 MD |
506 | scm_puts ("#<", port); |
507 | scm_print_port_mode (exp, port); | |
508 | if (SCM_OPFPORTP (exp)) | |
0f2d19dd | 509 | { |
b3ec3c64 | 510 | int fdes; |
b24b5e13 DH |
511 | SCM name = SCM_FILENAME (exp); |
512 | if (SCM_STRINGP (name) || SCM_SYMBOLP (name)) | |
513 | scm_display (name, port); | |
514 | else | |
515 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); | |
b3ec3c64 MD |
516 | scm_putc (' ', port); |
517 | fdes = (SCM_FSTREAM (exp))->fdes; | |
518 | ||
82893676 | 519 | #ifdef HAVE_TTYNAME |
b3ec3c64 MD |
520 | if (isatty (fdes)) |
521 | scm_puts (ttyname (fdes), port); | |
522 | else | |
82893676 | 523 | #endif /* HAVE_TTYNAME */ |
b3ec3c64 | 524 | scm_intprint (fdes, 10, port); |
0f2d19dd JB |
525 | } |
526 | else | |
527 | { | |
b3ec3c64 MD |
528 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); |
529 | scm_putc (' ', port); | |
63bcad19 | 530 | scm_intprint ((scm_t_bits) SCM_PTAB_ENTRY (exp), 16, port); |
0f2d19dd | 531 | } |
b3ec3c64 MD |
532 | scm_putc ('>', port); |
533 | return 1; | |
0f2d19dd JB |
534 | } |
535 | ||
cb63cf9e JB |
536 | /* thread-local block for input on fport's fdes. */ |
537 | static void | |
538 | fport_wait_for_input (SCM port) | |
3cb988bd | 539 | { |
cb63cf9e | 540 | int fdes = SCM_FSTREAM (port)->fdes; |
3cb988bd | 541 | |
affc96b5 | 542 | if (!fport_input_waiting (port)) |
8122b543 | 543 | { |
cb63cf9e JB |
544 | int n; |
545 | SELECT_TYPE readfds; | |
546 | int flags = fcntl (fdes, F_GETFL); | |
547 | ||
548 | if (flags == -1) | |
549 | scm_syserror ("scm_fdes_wait_for_input"); | |
550 | if (!(flags & O_NONBLOCK)) | |
551 | do | |
552 | { | |
553 | FD_ZERO (&readfds); | |
554 | FD_SET (fdes, &readfds); | |
555 | n = scm_internal_select (fdes + 1, &readfds, NULL, NULL, NULL); | |
556 | } | |
557 | while (n == -1 && errno == EINTR); | |
8122b543 | 558 | } |
3cb988bd | 559 | } |
0f2d19dd | 560 | |
affc96b5 | 561 | static void fport_flush (SCM port); |
0f2d19dd | 562 | |
c2da2648 GH |
563 | /* fill a port's read-buffer with a single read. returns the first |
564 | char or EOF if end of file. */ | |
0f2d19dd | 565 | static int |
affc96b5 | 566 | fport_fill_input (SCM port) |
0f2d19dd | 567 | { |
c014a02e | 568 | long count; |
92c2555f MV |
569 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
570 | scm_t_fport *fp = SCM_FSTREAM (port); | |
cb63cf9e | 571 | |
cb63cf9e | 572 | fport_wait_for_input (port); |
cb63cf9e JB |
573 | SCM_SYSCALL (count = read (fp->fdes, pt->read_buf, pt->read_buf_size)); |
574 | if (count == -1) | |
affc96b5 | 575 | scm_syserror ("fport_fill_input"); |
cb63cf9e JB |
576 | if (count == 0) |
577 | return EOF; | |
578 | else | |
579 | { | |
5c070ca7 | 580 | pt->read_pos = pt->read_buf; |
cb63cf9e | 581 | pt->read_end = pt->read_buf + count; |
5c070ca7 | 582 | return *pt->read_buf; |
cb63cf9e | 583 | } |
0f2d19dd JB |
584 | } |
585 | ||
cb63cf9e | 586 | static off_t |
affc96b5 | 587 | fport_seek (SCM port, off_t offset, int whence) |
0f2d19dd | 588 | { |
92c2555f MV |
589 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
590 | scm_t_fport *fp = SCM_FSTREAM (port); | |
7dcb364d GH |
591 | off_t rv; |
592 | off_t result; | |
593 | ||
594 | if (pt->rw_active == SCM_PORT_WRITE) | |
595 | { | |
596 | if (offset != 0 || whence != SEEK_CUR) | |
597 | { | |
598 | fport_flush (port); | |
599 | result = rv = lseek (fp->fdes, offset, whence); | |
600 | } | |
601 | else | |
602 | { | |
603 | /* read current position without disturbing the buffer. */ | |
604 | rv = lseek (fp->fdes, offset, whence); | |
605 | result = rv + (pt->write_pos - pt->write_buf); | |
606 | } | |
607 | } | |
608 | else if (pt->rw_active == SCM_PORT_READ) | |
609 | { | |
610 | if (offset != 0 || whence != SEEK_CUR) | |
611 | { | |
612 | /* could expand to avoid a second seek. */ | |
613 | scm_end_input (port); | |
614 | result = rv = lseek (fp->fdes, offset, whence); | |
615 | } | |
616 | else | |
617 | { | |
618 | /* read current position without disturbing the buffer | |
619 | (particularly the unread-char buffer). */ | |
620 | rv = lseek (fp->fdes, offset, whence); | |
621 | result = rv - (pt->read_end - pt->read_pos); | |
622 | ||
623 | if (pt->read_buf == pt->putback_buf) | |
624 | result -= pt->saved_read_end - pt->saved_read_pos; | |
625 | } | |
626 | } | |
627 | else /* SCM_PORT_NEITHER */ | |
628 | { | |
629 | result = rv = lseek (fp->fdes, offset, whence); | |
630 | } | |
cb8dfa3f | 631 | |
7dcb364d | 632 | if (rv == -1) |
affc96b5 | 633 | scm_syserror ("fport_seek"); |
7dcb364d | 634 | |
cb8dfa3f | 635 | return result; |
0f2d19dd JB |
636 | } |
637 | ||
840ae05d | 638 | static void |
affc96b5 | 639 | fport_truncate (SCM port, off_t length) |
840ae05d | 640 | { |
92c2555f | 641 | scm_t_fport *fp = SCM_FSTREAM (port); |
840ae05d JB |
642 | |
643 | if (ftruncate (fp->fdes, length) == -1) | |
644 | scm_syserror ("ftruncate"); | |
645 | } | |
646 | ||
0c6d2191 GH |
647 | /* helper for fport_write: try to write data, using multiple system |
648 | calls if required. */ | |
649 | #define FUNC_NAME "write_all" | |
650 | static void write_all (SCM port, const void *data, size_t remaining) | |
651 | { | |
652 | int fdes = SCM_FSTREAM (port)->fdes; | |
653 | ||
654 | while (remaining > 0) | |
655 | { | |
82893676 | 656 | size_t done; |
0c6d2191 GH |
657 | |
658 | SCM_SYSCALL (done = write (fdes, data, remaining)); | |
659 | ||
660 | if (done == -1) | |
661 | SCM_SYSERROR; | |
662 | remaining -= done; | |
663 | data = ((const char *) data) + done; | |
664 | } | |
665 | } | |
666 | #undef FUNC_NAME | |
667 | ||
31703ab8 | 668 | static void |
8aa011a1 | 669 | fport_write (SCM port, const void *data, size_t size) |
31703ab8 | 670 | { |
0c6d2191 | 671 | /* this procedure tries to minimize the number of writes/flushes. */ |
92c2555f | 672 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
31703ab8 | 673 | |
0c6d2191 GH |
674 | if (pt->write_buf == &pt->shortbuf |
675 | || (pt->write_pos == pt->write_buf && size >= pt->write_buf_size)) | |
31703ab8 | 676 | { |
0c6d2191 GH |
677 | /* "unbuffered" port, or |
678 | port with empty buffer and data won't fit in buffer. */ | |
679 | write_all (port, data, size); | |
680 | return; | |
31703ab8 | 681 | } |
d3639214 | 682 | |
0c6d2191 GH |
683 | { |
684 | off_t space = pt->write_end - pt->write_pos; | |
685 | ||
686 | if (size <= space) | |
687 | { | |
688 | /* data fits in buffer. */ | |
689 | memcpy (pt->write_pos, data, size); | |
690 | pt->write_pos += size; | |
691 | if (pt->write_pos == pt->write_end) | |
692 | { | |
affc96b5 | 693 | fport_flush (port); |
0c6d2191 GH |
694 | /* we can skip the line-buffering check if nothing's buffered. */ |
695 | return; | |
696 | } | |
697 | } | |
698 | else | |
699 | { | |
700 | memcpy (pt->write_pos, data, space); | |
701 | pt->write_pos = pt->write_end; | |
702 | fport_flush (port); | |
703 | { | |
704 | const void *ptr = ((const char *) data) + space; | |
705 | size_t remaining = size - space; | |
706 | ||
707 | if (size >= pt->write_buf_size) | |
708 | { | |
709 | write_all (port, ptr, remaining); | |
710 | return; | |
711 | } | |
712 | else | |
713 | { | |
714 | memcpy (pt->write_pos, ptr, remaining); | |
715 | pt->write_pos += remaining; | |
716 | } | |
31703ab8 | 717 | } |
0c6d2191 | 718 | } |
31703ab8 | 719 | |
0c6d2191 GH |
720 | /* handle line buffering. */ |
721 | if ((SCM_CELL_WORD_0 (port) & SCM_BUFLINE) && memchr (data, '\n', size)) | |
722 | fport_flush (port); | |
723 | } | |
31703ab8 GH |
724 | } |
725 | ||
726 | /* becomes 1 when process is exiting: normal exception handling won't | |
727 | work by this time. */ | |
04a98cff | 728 | extern int scm_i_terminating; |
0f2d19dd | 729 | |
cb63cf9e | 730 | static void |
affc96b5 | 731 | fport_flush (SCM port) |
0f2d19dd | 732 | { |
92c2555f MV |
733 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
734 | scm_t_fport *fp = SCM_FSTREAM (port); | |
6f760c1d | 735 | unsigned char *ptr = pt->write_buf; |
c014a02e ML |
736 | long init_size = pt->write_pos - pt->write_buf; |
737 | long remaining = init_size; | |
0f2d19dd | 738 | |
cb63cf9e JB |
739 | while (remaining > 0) |
740 | { | |
c014a02e | 741 | long count; |
cb63cf9e JB |
742 | |
743 | SCM_SYSCALL (count = write (fp->fdes, ptr, remaining)); | |
744 | if (count < 0) | |
745 | { | |
746 | /* error. assume nothing was written this call, but | |
747 | fix up the buffer for any previous successful writes. */ | |
c014a02e | 748 | long done = init_size - remaining; |
cb63cf9e JB |
749 | |
750 | if (done > 0) | |
751 | { | |
752 | int i; | |
753 | ||
754 | for (i = 0; i < remaining; i++) | |
755 | { | |
756 | *(pt->write_buf + i) = *(pt->write_buf + done + i); | |
757 | } | |
758 | pt->write_pos = pt->write_buf + remaining; | |
759 | } | |
04a98cff | 760 | if (scm_i_terminating) |
cb63cf9e JB |
761 | { |
762 | const char *msg = "Error: could not flush file-descriptor "; | |
763 | char buf[11]; | |
764 | ||
765 | write (2, msg, strlen (msg)); | |
766 | sprintf (buf, "%d\n", fp->fdes); | |
767 | write (2, buf, strlen (buf)); | |
768 | ||
769 | count = remaining; | |
770 | } | |
6b72ac1d GH |
771 | else if (scm_gc_running_p) |
772 | { | |
773 | /* silently ignore the error. scm_error would abort if we | |
774 | called it now. */ | |
775 | count = remaining; | |
776 | } | |
777 | else | |
778 | scm_syserror ("fport_flush"); | |
cb63cf9e JB |
779 | } |
780 | ptr += count; | |
781 | remaining -= count; | |
782 | } | |
783 | pt->write_pos = pt->write_buf; | |
61e452ba | 784 | pt->rw_active = SCM_PORT_NEITHER; |
840ae05d JB |
785 | } |
786 | ||
283a1a0e | 787 | /* clear the read buffer and adjust the file position for unread bytes. */ |
840ae05d | 788 | static void |
affc96b5 | 789 | fport_end_input (SCM port, int offset) |
840ae05d | 790 | { |
92c2555f MV |
791 | scm_t_fport *fp = SCM_FSTREAM (port); |
792 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
283a1a0e GH |
793 | |
794 | offset += pt->read_end - pt->read_pos; | |
840ae05d | 795 | |
840ae05d JB |
796 | if (offset > 0) |
797 | { | |
798 | pt->read_pos = pt->read_end; | |
799 | /* will throw error if unread-char used at beginning of file | |
800 | then attempting to write. seems correct. */ | |
801 | if (lseek (fp->fdes, -offset, SEEK_CUR) == -1) | |
affc96b5 | 802 | scm_syserror ("fport_end_input"); |
840ae05d | 803 | } |
61e452ba | 804 | pt->rw_active = SCM_PORT_NEITHER; |
8f29fbd0 JB |
805 | } |
806 | ||
6a2c4c81 | 807 | static int |
affc96b5 | 808 | fport_close (SCM port) |
6a2c4c81 | 809 | { |
92c2555f MV |
810 | scm_t_fport *fp = SCM_FSTREAM (port); |
811 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
cb63cf9e | 812 | int rv; |
840ae05d | 813 | |
affc96b5 | 814 | fport_flush (port); |
cb63cf9e JB |
815 | SCM_SYSCALL (rv = close (fp->fdes)); |
816 | if (rv == -1 && errno != EBADF) | |
6b72ac1d GH |
817 | { |
818 | if (scm_gc_running_p) | |
819 | /* silently ignore the error. scm_error would abort if we | |
820 | called it now. */ | |
821 | ; | |
822 | else | |
823 | scm_syserror ("fport_close"); | |
824 | } | |
6c951427 GH |
825 | if (pt->read_buf == pt->putback_buf) |
826 | pt->read_buf = pt->saved_read_buf; | |
cb63cf9e | 827 | if (pt->read_buf != &pt->shortbuf) |
4c9419ac | 828 | scm_gc_free (pt->read_buf, pt->read_buf_size, "port buffer"); |
cb63cf9e | 829 | if (pt->write_buf != &pt->shortbuf) |
4c9419ac MV |
830 | scm_gc_free (pt->write_buf, pt->write_buf_size, "port buffer"); |
831 | scm_gc_free (fp, sizeof (*fp), "file port"); | |
cb63cf9e | 832 | return rv; |
6a2c4c81 JB |
833 | } |
834 | ||
1be6b49c | 835 | static size_t |
affc96b5 | 836 | fport_free (SCM port) |
b3ec3c64 | 837 | { |
affc96b5 | 838 | fport_close (port); |
b3ec3c64 MD |
839 | return 0; |
840 | } | |
841 | ||
92c2555f | 842 | static scm_t_bits |
b3ec3c64 MD |
843 | scm_make_fptob () |
844 | { | |
92c2555f | 845 | scm_t_bits tc = scm_make_port_type ("file", fport_fill_input, fport_write); |
a98bddfd | 846 | |
affc96b5 | 847 | scm_set_port_free (tc, fport_free); |
e841c3e0 | 848 | scm_set_port_print (tc, fport_print); |
affc96b5 GH |
849 | scm_set_port_flush (tc, fport_flush); |
850 | scm_set_port_end_input (tc, fport_end_input); | |
851 | scm_set_port_close (tc, fport_close); | |
852 | scm_set_port_seek (tc, fport_seek); | |
853 | scm_set_port_truncate (tc, fport_truncate); | |
854 | scm_set_port_input_waiting (tc, fport_input_waiting); | |
a98bddfd DH |
855 | |
856 | return tc; | |
b3ec3c64 | 857 | } |
0f2d19dd | 858 | |
0f2d19dd JB |
859 | void |
860 | scm_init_fports () | |
0f2d19dd | 861 | { |
a98bddfd DH |
862 | scm_tc16_fport = scm_make_fptob (); |
863 | ||
86d31dfe MV |
864 | scm_c_define ("_IOFBF", SCM_MAKINUM (_IOFBF)); |
865 | scm_c_define ("_IOLBF", SCM_MAKINUM (_IOLBF)); | |
866 | scm_c_define ("_IONBF", SCM_MAKINUM (_IONBF)); | |
a98bddfd | 867 | |
a98bddfd | 868 | #include "libguile/fports.x" |
0f2d19dd | 869 | } |
89e00824 ML |
870 | |
871 | /* | |
872 | Local Variables: | |
873 | c-file-style: "gnu" | |
874 | End: | |
875 | */ |