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840ae05d | 1 | /* Copyright (C) 1995,1996,1997,1998,1999 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> |
0f2d19dd | 49 | #include "_scm.h" |
20e6290e | 50 | |
1bbd0b84 | 51 | #include "scm_validate.h" |
20e6290e | 52 | #include "fports.h" |
95b88819 GH |
53 | |
54 | #ifdef HAVE_STRING_H | |
55 | #include <string.h> | |
56 | #endif | |
0f2d19dd JB |
57 | #ifdef HAVE_UNISTD_H |
58 | #include <unistd.h> | |
59 | #else | |
0f2d19dd JB |
60 | scm_sizet fwrite (); |
61 | #endif | |
cb63cf9e JB |
62 | #ifdef HAVE_ST_BLKSIZE |
63 | #include <sys/stat.h> | |
64 | #endif | |
0f2d19dd | 65 | |
cb63cf9e | 66 | #include <errno.h> |
e145dd02 | 67 | |
cb63cf9e JB |
68 | #include "iselect.h" |
69 | ||
70 | /* create FPORT buffer with specified sizes (or -1 to use default size or | |
71 | 0 for no buffer. */ | |
72 | static void | |
73 | scm_fport_buffer_add (SCM port, int read_size, int write_size) | |
e145dd02 | 74 | { |
cb63cf9e | 75 | struct scm_fport *fp = SCM_FSTREAM (port); |
840ae05d | 76 | scm_port *pt = SCM_PTAB_ENTRY (port); |
cb63cf9e | 77 | char *s_scm_fport_buffer_add = "scm_fport_buffer_add"; |
e145dd02 | 78 | |
cb63cf9e JB |
79 | if (read_size == -1 || write_size == -1) |
80 | { | |
81 | int default_size; | |
82 | #ifdef HAVE_ST_BLKSIZE | |
83 | struct stat st; | |
84 | ||
85 | if (fstat (fp->fdes, &st) == -1) | |
86 | scm_syserror (s_scm_fport_buffer_add); | |
87 | default_size = st.st_blksize; | |
88 | #else | |
89 | default_size = 1024; | |
90 | #endif | |
91 | if (read_size == -1) | |
92 | read_size = default_size; | |
93 | if (write_size == -1) | |
94 | write_size = default_size; | |
95 | } | |
0f2d19dd | 96 | |
cb63cf9e JB |
97 | if (SCM_INPORTP (port) && read_size > 0) |
98 | { | |
840ae05d JB |
99 | pt->read_buf = malloc (read_size); |
100 | if (pt->read_buf == NULL) | |
101 | scm_memory_error (s_scm_fport_buffer_add); | |
cb63cf9e JB |
102 | pt->read_pos = pt->read_end = pt->read_buf; |
103 | pt->read_buf_size = read_size; | |
104 | } | |
105 | else | |
106 | { | |
840ae05d | 107 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; |
cb63cf9e JB |
108 | pt->read_buf_size = 1; |
109 | } | |
1717856b | 110 | |
cb63cf9e JB |
111 | if (SCM_OUTPORTP (port) && write_size > 0) |
112 | { | |
840ae05d JB |
113 | pt->write_buf = malloc (write_size); |
114 | if (pt->write_buf == NULL) | |
115 | scm_memory_error (s_scm_fport_buffer_add); | |
cb63cf9e JB |
116 | pt->write_pos = pt->write_buf; |
117 | pt->write_buf_size = write_size; | |
118 | } | |
119 | else | |
120 | { | |
121 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
122 | pt->write_buf_size = 1; | |
123 | } | |
124 | ||
125 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
126 | if (read_size > 0 || write_size > 0) | |
127 | SCM_SETCAR (port, SCM_CAR (port) & ~SCM_BUF0); | |
128 | else | |
129 | SCM_SETCAR (port, (SCM_CAR (port) | SCM_BUF0)); | |
7a6f1ffa GH |
130 | } |
131 | ||
a1ec6916 | 132 | SCM_DEFINE (scm_setvbuf, "setvbuf", 2, 1, 0, |
1bbd0b84 | 133 | (SCM port, SCM mode, SCM size), |
4079f87e GB |
134 | "Set the buffering mode for @var{port}. @var{mode} can be: |
135 | @table @code | |
136 | @item _IONBF | |
137 | non-buffered | |
138 | @item _IOLBF | |
139 | line buffered | |
140 | @item _IOFBF | |
141 | block buffered, using a newly allocated buffer of @var{size} bytes. | |
142 | If @var{size} is omitted, a default size will be used. | |
143 | @end table | |
144 | ||
145 | ||
146 | @deffn primitive fcntl fd/port command [value] | |
147 | Apply @var{command} to the specified file descriptor or the underlying | |
148 | file descriptor of the specified port. @var{value} is an optional | |
149 | integer argument. | |
150 | ||
151 | Values for @var{command} are: | |
152 | ||
153 | @table @code | |
154 | @item F_DUPFD | |
155 | Duplicate a file descriptor | |
156 | @item F_GETFD | |
157 | Get flags associated with the file descriptor. | |
158 | @item F_SETFD | |
159 | Set flags associated with the file descriptor to @var{value}. | |
160 | @item F_GETFL | |
161 | Get flags associated with the open file. | |
162 | @item F_SETFL | |
163 | Set flags associated with the open file to @var{value} | |
164 | @item F_GETOWN | |
165 | Get the process ID of a socket's owner, for @code{SIGIO} signals. | |
166 | @item F_SETOWN | |
167 | Set the process that owns a socket to @var{value}, for @code{SIGIO} signals. | |
168 | @item FD_CLOEXEC | |
169 | The value used to indicate the "close on exec" flag with @code{F_GETFL} or | |
170 | @code{F_SETFL}. | |
171 | @end table | |
172 | ") | |
1bbd0b84 | 173 | #define FUNC_NAME s_scm_setvbuf |
7a6f1ffa | 174 | { |
7a6f1ffa | 175 | int cmode, csize; |
840ae05d | 176 | scm_port *pt; |
7a6f1ffa | 177 | |
78446828 MV |
178 | port = SCM_COERCE_OUTPORT (port); |
179 | ||
3b3b36dd GB |
180 | SCM_VALIDATE_OPFPORT (1,port); |
181 | SCM_VALIDATE_INUM_COPY (2,mode,cmode); | |
d3639214 | 182 | if (cmode != _IONBF && cmode != _IOFBF && cmode != _IOLBF) |
1bbd0b84 | 183 | scm_out_of_range (FUNC_NAME, mode); |
d3639214 GH |
184 | |
185 | if (cmode == _IOLBF) | |
186 | { | |
187 | SCM_SETCAR (port, SCM_CAR (port) | SCM_BUFLINE); | |
188 | cmode = _IOFBF; | |
189 | } | |
190 | else | |
191 | { | |
192 | SCM_SETCAR (port, SCM_CAR (port) ^ SCM_BUFLINE); | |
193 | } | |
194 | ||
7a6f1ffa | 195 | if (SCM_UNBNDP (size)) |
cb63cf9e JB |
196 | { |
197 | if (cmode == _IOFBF) | |
198 | csize = -1; | |
199 | else | |
200 | csize = 0; | |
201 | } | |
7a6f1ffa GH |
202 | else |
203 | { | |
3b3b36dd | 204 | SCM_VALIDATE_INUM_COPY (3,size,csize); |
cb63cf9e | 205 | if (csize < 0 || (cmode == _IONBF && csize > 0)) |
1bbd0b84 | 206 | scm_out_of_range (FUNC_NAME, size); |
7a6f1ffa | 207 | } |
d3639214 | 208 | |
cb63cf9e | 209 | pt = SCM_PTAB_ENTRY (port); |
7a6f1ffa | 210 | |
cb63cf9e JB |
211 | /* silently discards buffered chars. */ |
212 | if (pt->read_buf != &pt->shortbuf) | |
213 | scm_must_free (pt->read_buf); | |
214 | if (pt->write_buf != &pt->shortbuf) | |
215 | scm_must_free (pt->write_buf); | |
7a6f1ffa | 216 | |
cb63cf9e JB |
217 | scm_fport_buffer_add (port, csize, csize); |
218 | return SCM_UNSPECIFIED; | |
0f2d19dd | 219 | } |
1bbd0b84 | 220 | #undef FUNC_NAME |
0f2d19dd | 221 | |
eadd48de GH |
222 | /* Move ports with the specified file descriptor to new descriptors, |
223 | * reseting the revealed count to 0. | |
0f2d19dd | 224 | */ |
1717856b | 225 | |
eadd48de | 226 | void |
6e8d25a6 | 227 | scm_evict_ports (int fd) |
0f2d19dd | 228 | { |
eadd48de | 229 | int i; |
0f2d19dd | 230 | |
eadd48de GH |
231 | for (i = 0; i < scm_port_table_size; i++) |
232 | { | |
cb63cf9e JB |
233 | SCM port = scm_port_table[i]->port; |
234 | ||
235 | if (SCM_FPORTP (port)) | |
eadd48de | 236 | { |
cb63cf9e JB |
237 | struct scm_fport *fp = SCM_FSTREAM (port); |
238 | ||
239 | if (fp->fdes == fd) | |
240 | { | |
241 | fp->fdes = dup (fd); | |
242 | if (fp->fdes == -1) | |
243 | scm_syserror ("scm_evict_ports"); | |
244 | scm_set_port_revealed_x (port, SCM_MAKINUM (0)); | |
245 | } | |
eadd48de GH |
246 | } |
247 | } | |
248 | } | |
0f2d19dd JB |
249 | |
250 | /* scm_open_file | |
251 | * Return a new port open on a given file. | |
252 | * | |
253 | * The mode string must match the pattern: [rwa+]** which | |
254 | * is interpreted in the usual unix way. | |
255 | * | |
256 | * Return the new port. | |
257 | */ | |
3b3b36dd | 258 | SCM_DEFINE (scm_open_file, "open-file", 2, 0, 0, |
1bbd0b84 | 259 | (SCM filename, SCM modes), |
4079f87e GB |
260 | "Open the file whose name is @var{string}, and return a port |
261 | representing that file. The attributes of the port are | |
262 | determined by the @var{mode} string. The way in | |
263 | which this is interpreted is similar to C stdio: | |
264 | ||
265 | The first character must be one of the following: | |
266 | ||
267 | @table @samp | |
268 | @item r | |
269 | Open an existing file for input. | |
270 | @item w | |
271 | Open a file for output, creating it if it doesn't already exist | |
272 | or removing its contents if it does. | |
273 | @item a | |
274 | Open a file for output, creating it if it doesn't already exist. | |
275 | All writes to the port will go to the end of the file. | |
276 | The "append mode" can be turned off while the port is in use | |
277 | @pxref{Ports and File Descriptors, fcntl} | |
278 | @end table | |
279 | ||
280 | The following additional characters can be appended: | |
281 | ||
282 | @table @samp | |
283 | @item + | |
284 | Open the port for both input and output. E.g., @code{r+}: open | |
285 | an existing file for both input and output. | |
286 | @item 0 | |
287 | Create an "unbuffered" port. In this case input and output operations | |
288 | are passed directly to the underlying port implementation without | |
289 | additional buffering. This is likely to slow down I/O operations. | |
290 | The buffering mode can be changed while a port is in use | |
291 | @pxref{Ports and File Descriptors, setvbuf} | |
292 | @item l | |
293 | Add line-buffering to the port. The port output buffer will be | |
294 | automatically flushed whenever a newline character is written. | |
295 | @end table | |
296 | ||
297 | In theory we could create read/write ports which were buffered in one | |
298 | direction only. However this isn't included in the current interfaces. | |
299 | ||
300 | If a file cannot be opened with the access requested, | |
301 | @code{open-file} throws an exception.") | |
1bbd0b84 | 302 | #define FUNC_NAME s_scm_open_file |
0f2d19dd | 303 | { |
19639113 | 304 | SCM port; |
cb63cf9e JB |
305 | int fdes; |
306 | int flags = 0; | |
19639113 GH |
307 | char *file; |
308 | char *mode; | |
cb63cf9e | 309 | char *ptr; |
19639113 | 310 | |
3b3b36dd GB |
311 | SCM_VALIDATE_ROSTRING (1,filename); |
312 | SCM_VALIDATE_ROSTRING (2,modes); | |
19639113 GH |
313 | if (SCM_SUBSTRP (filename)) |
314 | filename = scm_makfromstr (SCM_ROCHARS (filename), SCM_ROLENGTH (filename), 0); | |
315 | if (SCM_SUBSTRP (modes)) | |
316 | modes = scm_makfromstr (SCM_ROCHARS (modes), SCM_ROLENGTH (modes), 0); | |
317 | ||
318 | file = SCM_ROCHARS (filename); | |
319 | mode = SCM_ROCHARS (modes); | |
320 | ||
cb63cf9e | 321 | switch (*mode) |
0f2d19dd | 322 | { |
cb63cf9e JB |
323 | case 'r': |
324 | flags |= O_RDONLY; | |
325 | break; | |
326 | case 'w': | |
327 | flags |= O_WRONLY | O_CREAT | O_TRUNC; | |
328 | break; | |
329 | case 'a': | |
330 | flags |= O_WRONLY | O_CREAT | O_APPEND; | |
331 | break; | |
332 | default: | |
1bbd0b84 | 333 | scm_out_of_range (FUNC_NAME, modes); |
0f2d19dd | 334 | } |
cb63cf9e JB |
335 | ptr = mode + 1; |
336 | while (*ptr != '\0') | |
e145dd02 | 337 | { |
cb63cf9e JB |
338 | switch (*ptr) |
339 | { | |
340 | case '+': | |
341 | flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR; | |
342 | break; | |
343 | case '0': /* unbuffered: handled later. */ | |
344 | case 'b': /* 'binary' mode: ignored. */ | |
d3639214 | 345 | case 'l': /* line buffered: handled during output. */ |
cb63cf9e JB |
346 | break; |
347 | default: | |
1bbd0b84 | 348 | scm_out_of_range (FUNC_NAME, modes); |
cb63cf9e JB |
349 | } |
350 | ptr++; | |
e145dd02 | 351 | } |
cb63cf9e JB |
352 | SCM_SYSCALL (fdes = open (file, flags, 0666)); |
353 | if (fdes == -1) | |
e145dd02 | 354 | { |
cb63cf9e JB |
355 | int en = errno; |
356 | ||
70d63753 | 357 | scm_syserror_msg (FUNC_NAME, "~A: ~S", |
cb63cf9e JB |
358 | scm_cons (scm_makfrom0str (strerror (en)), |
359 | scm_cons (filename, SCM_EOL)), | |
360 | en); | |
0f2d19dd | 361 | } |
cb63cf9e | 362 | port = scm_fdes_to_port (fdes, mode, filename); |
0f2d19dd JB |
363 | return port; |
364 | } | |
1bbd0b84 | 365 | #undef FUNC_NAME |
0f2d19dd | 366 | |
e145dd02 | 367 | \f |
cb63cf9e | 368 | /* Building Guile ports from a file descriptor. */ |
e145dd02 | 369 | |
cb63cf9e | 370 | /* Build a Scheme port from an open file descriptor `fdes'. |
a089567e JB |
371 | MODE indicates whether FILE is open for reading or writing; it uses |
372 | the same notation as open-file's second argument. | |
e145dd02 | 373 | Use NAME as the port's filename. */ |
cb63cf9e | 374 | |
a089567e | 375 | SCM |
cb63cf9e | 376 | scm_fdes_to_port (int fdes, char *mode, SCM name) |
a089567e JB |
377 | { |
378 | long mode_bits = scm_mode_bits (mode); | |
379 | SCM port; | |
840ae05d | 380 | scm_port *pt; |
a089567e JB |
381 | |
382 | SCM_NEWCELL (port); | |
383 | SCM_DEFER_INTS; | |
cb63cf9e JB |
384 | pt = scm_add_to_port_table (port); |
385 | SCM_SETPTAB_ENTRY (port, pt); | |
386 | SCM_SETCAR (port, (scm_tc16_fport | mode_bits)); | |
387 | ||
a089567e | 388 | { |
cb63cf9e | 389 | struct scm_fport *fp |
840ae05d JB |
390 | = (struct scm_fport *) malloc (sizeof (struct scm_fport)); |
391 | if (fp == NULL) | |
392 | scm_memory_error ("scm_fdes_to_port"); | |
cb63cf9e | 393 | fp->fdes = fdes; |
0de97b83 | 394 | pt->rw_random = SCM_FDES_RANDOM_P (fdes); |
cb63cf9e JB |
395 | SCM_SETSTREAM (port, fp); |
396 | if (mode_bits & SCM_BUF0) | |
397 | scm_fport_buffer_add (port, 0, 0); | |
398 | else | |
399 | scm_fport_buffer_add (port, -1, -1); | |
a089567e | 400 | } |
cb63cf9e | 401 | SCM_PTAB_ENTRY (port)->file_name = name; |
a089567e | 402 | SCM_ALLOW_INTS; |
e145dd02 JB |
403 | return port; |
404 | } | |
405 | ||
406 | ||
affc96b5 | 407 | /* Return a lower bound on the number of bytes available for input. */ |
cb63cf9e | 408 | static int |
affc96b5 | 409 | fport_input_waiting (SCM port) |
e145dd02 | 410 | { |
cb63cf9e JB |
411 | int fdes = SCM_FSTREAM (port)->fdes; |
412 | ||
413 | #ifdef HAVE_SELECT | |
414 | struct timeval timeout; | |
415 | SELECT_TYPE read_set; | |
416 | SELECT_TYPE write_set; | |
417 | SELECT_TYPE except_set; | |
418 | ||
419 | FD_ZERO (&read_set); | |
420 | FD_ZERO (&write_set); | |
421 | FD_ZERO (&except_set); | |
422 | ||
423 | FD_SET (fdes, &read_set); | |
424 | ||
425 | timeout.tv_sec = 0; | |
426 | timeout.tv_usec = 0; | |
427 | ||
428 | if (select (SELECT_SET_SIZE, | |
429 | &read_set, &write_set, &except_set, &timeout) | |
430 | < 0) | |
affc96b5 GH |
431 | scm_syserror ("fport_input_waiting"); |
432 | return FD_ISSET (fdes, &read_set) ? 1 : 0; | |
cb63cf9e JB |
433 | #elif defined (FIONREAD) |
434 | int remir; | |
435 | ioctl(fdes, FIONREAD, &remir); | |
436 | return remir; | |
437 | #else | |
affc96b5 | 438 | scm_misc_error ("fport_input_waiting", |
cb63cf9e JB |
439 | "Not fully implemented on this platform", |
440 | SCM_EOL); | |
441 | #endif | |
a089567e JB |
442 | } |
443 | ||
cb63cf9e | 444 | \f |
0f2d19dd | 445 | static int |
1bbd0b84 | 446 | prinfport (SCM exp,SCM port,scm_print_state *pstate) |
0f2d19dd | 447 | { |
b3ec3c64 MD |
448 | scm_puts ("#<", port); |
449 | scm_print_port_mode (exp, port); | |
450 | if (SCM_OPFPORTP (exp)) | |
0f2d19dd | 451 | { |
b3ec3c64 MD |
452 | int fdes; |
453 | SCM name = SCM_PTAB_ENTRY (exp)->file_name; | |
0c95b57d | 454 | scm_puts (SCM_ROSTRINGP (name) |
b3ec3c64 MD |
455 | ? SCM_ROCHARS (name) |
456 | : SCM_PTOBNAME (SCM_PTOBNUM (exp)), | |
457 | port); | |
458 | scm_putc (' ', port); | |
459 | fdes = (SCM_FSTREAM (exp))->fdes; | |
460 | ||
461 | if (isatty (fdes)) | |
462 | scm_puts (ttyname (fdes), port); | |
463 | else | |
464 | scm_intprint (fdes, 10, port); | |
0f2d19dd JB |
465 | } |
466 | else | |
467 | { | |
b3ec3c64 MD |
468 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); |
469 | scm_putc (' ', port); | |
470 | scm_intprint (SCM_CDR (exp), 16, port); | |
0f2d19dd | 471 | } |
b3ec3c64 MD |
472 | scm_putc ('>', port); |
473 | return 1; | |
0f2d19dd JB |
474 | } |
475 | ||
cb63cf9e JB |
476 | #ifdef GUILE_ISELECT |
477 | /* thread-local block for input on fport's fdes. */ | |
478 | static void | |
479 | fport_wait_for_input (SCM port) | |
3cb988bd | 480 | { |
cb63cf9e | 481 | int fdes = SCM_FSTREAM (port)->fdes; |
3cb988bd | 482 | |
affc96b5 | 483 | if (!fport_input_waiting (port)) |
8122b543 | 484 | { |
cb63cf9e JB |
485 | int n; |
486 | SELECT_TYPE readfds; | |
487 | int flags = fcntl (fdes, F_GETFL); | |
488 | ||
489 | if (flags == -1) | |
490 | scm_syserror ("scm_fdes_wait_for_input"); | |
491 | if (!(flags & O_NONBLOCK)) | |
492 | do | |
493 | { | |
494 | FD_ZERO (&readfds); | |
495 | FD_SET (fdes, &readfds); | |
496 | n = scm_internal_select (fdes + 1, &readfds, NULL, NULL, NULL); | |
497 | } | |
498 | while (n == -1 && errno == EINTR); | |
8122b543 | 499 | } |
3cb988bd | 500 | } |
0f2d19dd JB |
501 | #endif |
502 | ||
affc96b5 | 503 | static void fport_flush (SCM port); |
0f2d19dd | 504 | |
cb63cf9e JB |
505 | /* fill a port's read-buffer with a single read. |
506 | returns the first char and moves the read_pos pointer past it. | |
507 | or returns EOF if end of file. */ | |
0f2d19dd | 508 | static int |
affc96b5 | 509 | fport_fill_input (SCM port) |
0f2d19dd | 510 | { |
cb63cf9e | 511 | int count; |
840ae05d | 512 | scm_port *pt = SCM_PTAB_ENTRY (port); |
cb63cf9e JB |
513 | struct scm_fport *fp = SCM_FSTREAM (port); |
514 | ||
cb63cf9e JB |
515 | #ifdef GUILE_ISELECT |
516 | fport_wait_for_input (port); | |
517 | #endif | |
518 | SCM_SYSCALL (count = read (fp->fdes, pt->read_buf, pt->read_buf_size)); | |
519 | if (count == -1) | |
affc96b5 | 520 | scm_syserror ("fport_fill_input"); |
cb63cf9e JB |
521 | if (count == 0) |
522 | return EOF; | |
523 | else | |
524 | { | |
5c070ca7 | 525 | pt->read_pos = pt->read_buf; |
cb63cf9e | 526 | pt->read_end = pt->read_buf + count; |
5c070ca7 | 527 | return *pt->read_buf; |
cb63cf9e | 528 | } |
0f2d19dd JB |
529 | } |
530 | ||
cb63cf9e | 531 | static off_t |
affc96b5 | 532 | fport_seek (SCM port, off_t offset, int whence) |
0f2d19dd | 533 | { |
7dcb364d | 534 | scm_port *pt = SCM_PTAB_ENTRY (port); |
cb63cf9e | 535 | struct scm_fport *fp = SCM_FSTREAM (port); |
7dcb364d GH |
536 | off_t rv; |
537 | off_t result; | |
538 | ||
539 | if (pt->rw_active == SCM_PORT_WRITE) | |
540 | { | |
541 | if (offset != 0 || whence != SEEK_CUR) | |
542 | { | |
543 | fport_flush (port); | |
544 | result = rv = lseek (fp->fdes, offset, whence); | |
545 | } | |
546 | else | |
547 | { | |
548 | /* read current position without disturbing the buffer. */ | |
549 | rv = lseek (fp->fdes, offset, whence); | |
550 | result = rv + (pt->write_pos - pt->write_buf); | |
551 | } | |
552 | } | |
553 | else if (pt->rw_active == SCM_PORT_READ) | |
554 | { | |
555 | if (offset != 0 || whence != SEEK_CUR) | |
556 | { | |
557 | /* could expand to avoid a second seek. */ | |
558 | scm_end_input (port); | |
559 | result = rv = lseek (fp->fdes, offset, whence); | |
560 | } | |
561 | else | |
562 | { | |
563 | /* read current position without disturbing the buffer | |
564 | (particularly the unread-char buffer). */ | |
565 | rv = lseek (fp->fdes, offset, whence); | |
566 | result = rv - (pt->read_end - pt->read_pos); | |
567 | ||
568 | if (pt->read_buf == pt->putback_buf) | |
569 | result -= pt->saved_read_end - pt->saved_read_pos; | |
570 | } | |
571 | } | |
572 | else /* SCM_PORT_NEITHER */ | |
573 | { | |
574 | result = rv = lseek (fp->fdes, offset, whence); | |
575 | } | |
cb8dfa3f | 576 | |
7dcb364d | 577 | if (rv == -1) |
affc96b5 | 578 | scm_syserror ("fport_seek"); |
7dcb364d | 579 | |
cb8dfa3f | 580 | return result; |
0f2d19dd JB |
581 | } |
582 | ||
840ae05d | 583 | static void |
affc96b5 | 584 | fport_truncate (SCM port, off_t length) |
840ae05d JB |
585 | { |
586 | struct scm_fport *fp = SCM_FSTREAM (port); | |
587 | ||
588 | if (ftruncate (fp->fdes, length) == -1) | |
589 | scm_syserror ("ftruncate"); | |
590 | } | |
591 | ||
31703ab8 GH |
592 | static void |
593 | fport_write (SCM port, void *data, size_t size) | |
594 | { | |
595 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
596 | ||
597 | if (pt->write_buf == &pt->shortbuf) | |
598 | { | |
599 | /* "unbuffered" port. */ | |
600 | int fdes = SCM_FSTREAM (port)->fdes; | |
601 | ||
602 | if (write (fdes, data, size) == -1) | |
603 | scm_syserror ("fport_write"); | |
604 | } | |
605 | else | |
606 | { | |
607 | const char *input = (char *) data; | |
d3639214 GH |
608 | size_t remaining = size; |
609 | ||
610 | while (remaining > 0) | |
31703ab8 GH |
611 | { |
612 | int space = pt->write_end - pt->write_pos; | |
d3639214 | 613 | int write_len = (remaining > space) ? space : remaining; |
31703ab8 | 614 | |
162d88ca | 615 | memcpy (pt->write_pos, input, write_len); |
31703ab8 | 616 | pt->write_pos += write_len; |
d3639214 | 617 | remaining -= write_len; |
31703ab8 GH |
618 | input += write_len; |
619 | if (write_len == space) | |
affc96b5 | 620 | fport_flush (port); |
31703ab8 GH |
621 | } |
622 | ||
623 | /* handle line buffering. */ | |
624 | if ((SCM_CAR (port) & SCM_BUFLINE) && memchr (data, '\n', size)) | |
affc96b5 | 625 | fport_flush (port); |
31703ab8 GH |
626 | } |
627 | } | |
628 | ||
629 | /* becomes 1 when process is exiting: normal exception handling won't | |
630 | work by this time. */ | |
cb63cf9e | 631 | extern int terminating; |
0f2d19dd | 632 | |
cb63cf9e | 633 | static void |
affc96b5 | 634 | fport_flush (SCM port) |
0f2d19dd | 635 | { |
840ae05d | 636 | scm_port *pt = SCM_PTAB_ENTRY (port); |
cb63cf9e JB |
637 | struct scm_fport *fp = SCM_FSTREAM (port); |
638 | char *ptr = pt->write_buf; | |
639 | int init_size = pt->write_pos - pt->write_buf; | |
640 | int remaining = init_size; | |
0f2d19dd | 641 | |
cb63cf9e JB |
642 | while (remaining > 0) |
643 | { | |
644 | int count; | |
645 | ||
646 | SCM_SYSCALL (count = write (fp->fdes, ptr, remaining)); | |
647 | if (count < 0) | |
648 | { | |
649 | /* error. assume nothing was written this call, but | |
650 | fix up the buffer for any previous successful writes. */ | |
651 | int done = init_size - remaining; | |
652 | ||
653 | if (done > 0) | |
654 | { | |
655 | int i; | |
656 | ||
657 | for (i = 0; i < remaining; i++) | |
658 | { | |
659 | *(pt->write_buf + i) = *(pt->write_buf + done + i); | |
660 | } | |
661 | pt->write_pos = pt->write_buf + remaining; | |
662 | } | |
663 | if (!terminating) | |
affc96b5 | 664 | scm_syserror ("fport_flush"); |
cb63cf9e JB |
665 | else |
666 | { | |
667 | const char *msg = "Error: could not flush file-descriptor "; | |
668 | char buf[11]; | |
669 | ||
670 | write (2, msg, strlen (msg)); | |
671 | sprintf (buf, "%d\n", fp->fdes); | |
672 | write (2, buf, strlen (buf)); | |
673 | ||
674 | count = remaining; | |
675 | } | |
676 | } | |
677 | ptr += count; | |
678 | remaining -= count; | |
679 | } | |
680 | pt->write_pos = pt->write_buf; | |
61e452ba | 681 | pt->rw_active = SCM_PORT_NEITHER; |
840ae05d JB |
682 | } |
683 | ||
283a1a0e | 684 | /* clear the read buffer and adjust the file position for unread bytes. */ |
840ae05d | 685 | static void |
affc96b5 | 686 | fport_end_input (SCM port, int offset) |
840ae05d JB |
687 | { |
688 | struct scm_fport *fp = SCM_FSTREAM (port); | |
689 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
283a1a0e GH |
690 | |
691 | offset += pt->read_end - pt->read_pos; | |
840ae05d | 692 | |
840ae05d JB |
693 | if (offset > 0) |
694 | { | |
695 | pt->read_pos = pt->read_end; | |
696 | /* will throw error if unread-char used at beginning of file | |
697 | then attempting to write. seems correct. */ | |
698 | if (lseek (fp->fdes, -offset, SEEK_CUR) == -1) | |
affc96b5 | 699 | scm_syserror ("fport_end_input"); |
840ae05d | 700 | } |
61e452ba | 701 | pt->rw_active = SCM_PORT_NEITHER; |
8f29fbd0 JB |
702 | } |
703 | ||
6a2c4c81 | 704 | static int |
affc96b5 | 705 | fport_close (SCM port) |
6a2c4c81 | 706 | { |
cb63cf9e | 707 | struct scm_fport *fp = SCM_FSTREAM (port); |
840ae05d | 708 | scm_port *pt = SCM_PTAB_ENTRY (port); |
cb63cf9e | 709 | int rv; |
840ae05d | 710 | |
affc96b5 | 711 | fport_flush (port); |
cb63cf9e JB |
712 | SCM_SYSCALL (rv = close (fp->fdes)); |
713 | if (rv == -1 && errno != EBADF) | |
affc96b5 | 714 | scm_syserror ("fport_close"); |
6c951427 GH |
715 | if (pt->read_buf == pt->putback_buf) |
716 | pt->read_buf = pt->saved_read_buf; | |
cb63cf9e | 717 | if (pt->read_buf != &pt->shortbuf) |
840ae05d | 718 | free (pt->read_buf); |
cb63cf9e | 719 | if (pt->write_buf != &pt->shortbuf) |
840ae05d JB |
720 | free (pt->write_buf); |
721 | free ((char *) fp); | |
cb63cf9e | 722 | return rv; |
6a2c4c81 JB |
723 | } |
724 | ||
b3ec3c64 | 725 | static scm_sizet |
affc96b5 | 726 | fport_free (SCM port) |
b3ec3c64 | 727 | { |
affc96b5 | 728 | fport_close (port); |
b3ec3c64 MD |
729 | return 0; |
730 | } | |
731 | ||
732 | void scm_make_fptob (void); /* Called from ports.c */ | |
733 | ||
734 | void | |
735 | scm_make_fptob () | |
736 | { | |
affc96b5 GH |
737 | long tc = scm_make_port_type ("file", fport_fill_input, fport_write); |
738 | scm_set_port_free (tc, fport_free); | |
6c747373 | 739 | scm_set_port_print (tc, prinfport); |
affc96b5 GH |
740 | scm_set_port_flush (tc, fport_flush); |
741 | scm_set_port_end_input (tc, fport_end_input); | |
742 | scm_set_port_close (tc, fport_close); | |
743 | scm_set_port_seek (tc, fport_seek); | |
744 | scm_set_port_truncate (tc, fport_truncate); | |
745 | scm_set_port_input_waiting (tc, fport_input_waiting); | |
b3ec3c64 | 746 | } |
0f2d19dd | 747 | |
0f2d19dd JB |
748 | void |
749 | scm_init_fports () | |
0f2d19dd JB |
750 | { |
751 | #include "fports.x" | |
7a6f1ffa GH |
752 | scm_sysintern ("_IOFBF", SCM_MAKINUM (_IOFBF)); |
753 | scm_sysintern ("_IOLBF", SCM_MAKINUM (_IOLBF)); | |
754 | scm_sysintern ("_IONBF", SCM_MAKINUM (_IONBF)); | |
0f2d19dd | 755 | } |