Commit | Line | Data |
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f2c9fcb0 | 1 | /* Copyright (C) 1995,1996,1997,1998,1999, 2000 Free Software Foundation, Inc. |
0f2d19dd JB |
2 | * |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License as published by | |
5 | * the Free Software Foundation; either version 2, or (at your option) | |
6 | * any later version. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this software; see the file COPYING. If not, write to | |
82892bed JB |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
16 | * Boston, MA 02111-1307 USA | |
0f2d19dd JB |
17 | * |
18 | * As a special exception, the Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of GUILE. | |
20 | * | |
21 | * The exception is that, if you link the GUILE library with other files | |
22 | * to produce an executable, this does not by itself cause the | |
23 | * resulting executable to be covered by the GNU General Public License. | |
24 | * Your use of that executable is in no way restricted on account of | |
25 | * linking the GUILE library code into it. | |
26 | * | |
27 | * This exception does not however invalidate any other reasons why | |
28 | * the executable file might be covered by the GNU General Public License. | |
29 | * | |
30 | * This exception applies only to the code released by the | |
31 | * Free Software Foundation under the name GUILE. If you copy | |
32 | * code from other Free Software Foundation releases into a copy of | |
33 | * GUILE, as the General Public License permits, the exception does | |
34 | * not apply to the code that you add in this way. To avoid misleading | |
35 | * anyone as to the status of such modified files, you must delete | |
36 | * this exception notice from them. | |
37 | * | |
38 | * If you write modifications of your own for GUILE, it is your choice | |
39 | * whether to permit this exception to apply to your modifications. | |
82892bed | 40 | * If you do not wish that, delete this exception notice. */ |
1bbd0b84 GB |
41 | |
42 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, | |
43 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
44 | ||
0f2d19dd JB |
45 | \f |
46 | ||
47 | #include <stdio.h> | |
cb63cf9e | 48 | #include <fcntl.h> |
a0599745 MD |
49 | #include "libguile/_scm.h" |
50 | #include "libguile/strings.h" | |
a0599745 | 51 | #include "libguile/validate.h" |
6b72ac1d GH |
52 | #include "libguile/gc.h" |
53 | ||
a0599745 | 54 | #include "libguile/fports.h" |
95b88819 GH |
55 | |
56 | #ifdef HAVE_STRING_H | |
57 | #include <string.h> | |
58 | #endif | |
0f2d19dd JB |
59 | #ifdef HAVE_UNISTD_H |
60 | #include <unistd.h> | |
61 | #else | |
0f2d19dd JB |
62 | scm_sizet fwrite (); |
63 | #endif | |
cb63cf9e JB |
64 | #ifdef HAVE_ST_BLKSIZE |
65 | #include <sys/stat.h> | |
66 | #endif | |
0f2d19dd | 67 | |
cb63cf9e | 68 | #include <errno.h> |
e145dd02 | 69 | |
a0599745 | 70 | #include "libguile/iselect.h" |
cb63cf9e | 71 | |
a98bddfd DH |
72 | |
73 | scm_bits_t scm_tc16_fport; | |
74 | ||
75 | ||
19b27fa2 GH |
76 | /* default buffer size, used if the O/S won't supply a value. */ |
77 | static const int default_buffer_size = 1024; | |
78 | ||
cb63cf9e JB |
79 | /* create FPORT buffer with specified sizes (or -1 to use default size or |
80 | 0 for no buffer. */ | |
81 | static void | |
82 | scm_fport_buffer_add (SCM port, int read_size, int write_size) | |
e145dd02 | 83 | { |
cb63cf9e | 84 | struct scm_fport *fp = SCM_FSTREAM (port); |
b24b5e13 | 85 | scm_port *pt = SCM_PTAB_ENTRY (port); |
cb63cf9e | 86 | char *s_scm_fport_buffer_add = "scm_fport_buffer_add"; |
e145dd02 | 87 | |
cb63cf9e JB |
88 | if (read_size == -1 || write_size == -1) |
89 | { | |
90 | int default_size; | |
91 | #ifdef HAVE_ST_BLKSIZE | |
92 | struct stat st; | |
93 | ||
19b27fa2 GH |
94 | default_size = (fstat (fp->fdes, &st) == -1) ? default_buffer_size |
95 | : st.st_blksize; | |
cb63cf9e | 96 | #else |
19b27fa2 | 97 | default_size = default_buffer_size; |
cb63cf9e JB |
98 | #endif |
99 | if (read_size == -1) | |
100 | read_size = default_size; | |
101 | if (write_size == -1) | |
102 | write_size = default_size; | |
103 | } | |
0f2d19dd | 104 | |
f5f2dcff | 105 | if (SCM_INPUT_PORT_P (port) && read_size > 0) |
cb63cf9e | 106 | { |
840ae05d JB |
107 | pt->read_buf = malloc (read_size); |
108 | if (pt->read_buf == NULL) | |
109 | scm_memory_error (s_scm_fport_buffer_add); | |
cb63cf9e JB |
110 | pt->read_pos = pt->read_end = pt->read_buf; |
111 | pt->read_buf_size = read_size; | |
112 | } | |
113 | else | |
114 | { | |
840ae05d | 115 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; |
cb63cf9e JB |
116 | pt->read_buf_size = 1; |
117 | } | |
1717856b | 118 | |
f5f2dcff | 119 | if (SCM_OUTPUT_PORT_P (port) && write_size > 0) |
cb63cf9e | 120 | { |
840ae05d JB |
121 | pt->write_buf = malloc (write_size); |
122 | if (pt->write_buf == NULL) | |
123 | scm_memory_error (s_scm_fport_buffer_add); | |
cb63cf9e JB |
124 | pt->write_pos = pt->write_buf; |
125 | pt->write_buf_size = write_size; | |
126 | } | |
127 | else | |
128 | { | |
129 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
130 | pt->write_buf_size = 1; | |
131 | } | |
132 | ||
133 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
134 | if (read_size > 0 || write_size > 0) | |
54778cd3 | 135 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0); |
cb63cf9e | 136 | else |
54778cd3 | 137 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUF0); |
7a6f1ffa GH |
138 | } |
139 | ||
a1ec6916 | 140 | SCM_DEFINE (scm_setvbuf, "setvbuf", 2, 1, 0, |
1bbd0b84 | 141 | (SCM port, SCM mode, SCM size), |
fc0d72d4 MD |
142 | "Set the buffering mode for @var{port}. @var{mode} can be:\n" |
143 | "@table @code\n" | |
144 | "@item _IONBF\n" | |
145 | "non-buffered\n" | |
146 | "@item _IOLBF\n" | |
147 | "line buffered\n" | |
148 | "@item _IOFBF\n" | |
149 | "block buffered, using a newly allocated buffer of @var{size} bytes.\n" | |
150 | "If @var{size} is omitted, a default size will be used.\n" | |
2c1ae20e | 151 | "@end table") |
1bbd0b84 | 152 | #define FUNC_NAME s_scm_setvbuf |
7a6f1ffa | 153 | { |
7a6f1ffa | 154 | int cmode, csize; |
840ae05d | 155 | scm_port *pt; |
7a6f1ffa | 156 | |
78446828 MV |
157 | port = SCM_COERCE_OUTPORT (port); |
158 | ||
3b3b36dd GB |
159 | SCM_VALIDATE_OPFPORT (1,port); |
160 | SCM_VALIDATE_INUM_COPY (2,mode,cmode); | |
d3639214 | 161 | if (cmode != _IONBF && cmode != _IOFBF && cmode != _IOLBF) |
1bbd0b84 | 162 | scm_out_of_range (FUNC_NAME, mode); |
d3639214 GH |
163 | |
164 | if (cmode == _IOLBF) | |
165 | { | |
54778cd3 | 166 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUFLINE); |
d3639214 GH |
167 | cmode = _IOFBF; |
168 | } | |
169 | else | |
170 | { | |
54778cd3 | 171 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) ^ SCM_BUFLINE); |
d3639214 GH |
172 | } |
173 | ||
7a6f1ffa | 174 | if (SCM_UNBNDP (size)) |
cb63cf9e JB |
175 | { |
176 | if (cmode == _IOFBF) | |
177 | csize = -1; | |
178 | else | |
179 | csize = 0; | |
180 | } | |
7a6f1ffa GH |
181 | else |
182 | { | |
3b3b36dd | 183 | SCM_VALIDATE_INUM_COPY (3,size,csize); |
cb63cf9e | 184 | if (csize < 0 || (cmode == _IONBF && csize > 0)) |
1bbd0b84 | 185 | scm_out_of_range (FUNC_NAME, size); |
7a6f1ffa | 186 | } |
d3639214 | 187 | |
cb63cf9e | 188 | pt = SCM_PTAB_ENTRY (port); |
7a6f1ffa | 189 | |
cb63cf9e JB |
190 | /* silently discards buffered chars. */ |
191 | if (pt->read_buf != &pt->shortbuf) | |
f30c9c8f | 192 | free (pt->read_buf); |
cb63cf9e | 193 | if (pt->write_buf != &pt->shortbuf) |
f30c9c8f | 194 | free (pt->write_buf); |
7a6f1ffa | 195 | |
cb63cf9e JB |
196 | scm_fport_buffer_add (port, csize, csize); |
197 | return SCM_UNSPECIFIED; | |
0f2d19dd | 198 | } |
1bbd0b84 | 199 | #undef FUNC_NAME |
0f2d19dd | 200 | |
eadd48de GH |
201 | /* Move ports with the specified file descriptor to new descriptors, |
202 | * reseting the revealed count to 0. | |
0f2d19dd | 203 | */ |
1717856b | 204 | |
eadd48de | 205 | void |
6e8d25a6 | 206 | scm_evict_ports (int fd) |
0f2d19dd | 207 | { |
eadd48de | 208 | int i; |
0f2d19dd | 209 | |
eadd48de GH |
210 | for (i = 0; i < scm_port_table_size; i++) |
211 | { | |
cb63cf9e JB |
212 | SCM port = scm_port_table[i]->port; |
213 | ||
214 | if (SCM_FPORTP (port)) | |
eadd48de | 215 | { |
cb63cf9e JB |
216 | struct scm_fport *fp = SCM_FSTREAM (port); |
217 | ||
218 | if (fp->fdes == fd) | |
219 | { | |
220 | fp->fdes = dup (fd); | |
221 | if (fp->fdes == -1) | |
222 | scm_syserror ("scm_evict_ports"); | |
223 | scm_set_port_revealed_x (port, SCM_MAKINUM (0)); | |
224 | } | |
eadd48de GH |
225 | } |
226 | } | |
227 | } | |
0f2d19dd | 228 | |
efa40607 DH |
229 | |
230 | SCM_DEFINE (scm_file_port_p, "file-port?", 1, 0, 0, | |
231 | (SCM obj), | |
232 | "Determine whether OBJ is a port that is related to a file.") | |
233 | #define FUNC_NAME s_scm_file_port_p | |
234 | { | |
235 | return SCM_BOOL (SCM_FPORTP (obj)); | |
236 | } | |
237 | #undef FUNC_NAME | |
238 | ||
239 | ||
0f2d19dd JB |
240 | /* scm_open_file |
241 | * Return a new port open on a given file. | |
242 | * | |
243 | * The mode string must match the pattern: [rwa+]** which | |
244 | * is interpreted in the usual unix way. | |
245 | * | |
246 | * Return the new port. | |
247 | */ | |
3b3b36dd | 248 | SCM_DEFINE (scm_open_file, "open-file", 2, 0, 0, |
1bbd0b84 | 249 | (SCM filename, SCM modes), |
fc0d72d4 MD |
250 | "Open the file whose name is @var{string}, and return a port\n" |
251 | "representing that file. The attributes of the port are\n" | |
252 | "determined by the @var{mode} string. The way in \n" | |
253 | "which this is interpreted is similar to C stdio:\n\n" | |
254 | "The first character must be one of the following:\n\n" | |
255 | "@table @samp\n" | |
256 | "@item r\n" | |
257 | "Open an existing file for input.\n" | |
258 | "@item w\n" | |
259 | "Open a file for output, creating it if it doesn't already exist\n" | |
260 | "or removing its contents if it does.\n" | |
261 | "@item a\n" | |
262 | "Open a file for output, creating it if it doesn't already exist.\n" | |
263 | "All writes to the port will go to the end of the file.\n" | |
264 | "The \"append mode\" can be turned off while the port is in use\n" | |
265 | "@pxref{Ports and File Descriptors, fcntl}\n" | |
266 | "@end table\n\n" | |
267 | "The following additional characters can be appended:\n\n" | |
268 | "@table @samp\n" | |
269 | "@item +\n" | |
270 | "Open the port for both input and output. E.g., @code{r+}: open\n" | |
271 | "an existing file for both input and output.\n" | |
272 | "@item 0\n" | |
273 | "Create an \"unbuffered\" port. In this case input and output operations\n" | |
274 | "are passed directly to the underlying port implementation without\n" | |
275 | "additional buffering. This is likely to slow down I/O operations.\n" | |
276 | "The buffering mode can be changed while a port is in use\n" | |
277 | "@pxref{Ports and File Descriptors, setvbuf}\n" | |
278 | "@item l\n" | |
279 | "Add line-buffering to the port. The port output buffer will be\n" | |
280 | "automatically flushed whenever a newline character is written.\n" | |
281 | "@end table\n\n" | |
282 | "In theory we could create read/write ports which were buffered in one\n" | |
283 | "direction only. However this isn't included in the current interfaces.\n\n" | |
284 | "If a file cannot be opened with the access requested,\n" | |
285 | "@code{open-file} throws an exception.") | |
1bbd0b84 | 286 | #define FUNC_NAME s_scm_open_file |
0f2d19dd | 287 | { |
19639113 | 288 | SCM port; |
cb63cf9e JB |
289 | int fdes; |
290 | int flags = 0; | |
19639113 GH |
291 | char *file; |
292 | char *mode; | |
cb63cf9e | 293 | char *ptr; |
19639113 | 294 | |
a6d9e5ab DH |
295 | SCM_VALIDATE_STRING (1, filename); |
296 | SCM_VALIDATE_STRING (2, modes); | |
297 | SCM_STRING_COERCE_0TERMINATION_X (filename); | |
298 | SCM_STRING_COERCE_0TERMINATION_X (modes); | |
19639113 | 299 | |
a6d9e5ab DH |
300 | file = SCM_STRING_CHARS (filename); |
301 | mode = SCM_STRING_CHARS (modes); | |
19639113 | 302 | |
cb63cf9e | 303 | switch (*mode) |
0f2d19dd | 304 | { |
cb63cf9e JB |
305 | case 'r': |
306 | flags |= O_RDONLY; | |
307 | break; | |
308 | case 'w': | |
309 | flags |= O_WRONLY | O_CREAT | O_TRUNC; | |
310 | break; | |
311 | case 'a': | |
312 | flags |= O_WRONLY | O_CREAT | O_APPEND; | |
313 | break; | |
314 | default: | |
1bbd0b84 | 315 | scm_out_of_range (FUNC_NAME, modes); |
0f2d19dd | 316 | } |
cb63cf9e JB |
317 | ptr = mode + 1; |
318 | while (*ptr != '\0') | |
e145dd02 | 319 | { |
cb63cf9e JB |
320 | switch (*ptr) |
321 | { | |
322 | case '+': | |
323 | flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR; | |
324 | break; | |
9f561420 GH |
325 | case 'b': |
326 | #if defined (O_BINARY) | |
327 | flags |= O_BINARY; | |
328 | #endif | |
329 | break; | |
cb63cf9e | 330 | case '0': /* unbuffered: handled later. */ |
d3639214 | 331 | case 'l': /* line buffered: handled during output. */ |
cb63cf9e JB |
332 | break; |
333 | default: | |
1bbd0b84 | 334 | scm_out_of_range (FUNC_NAME, modes); |
cb63cf9e JB |
335 | } |
336 | ptr++; | |
e145dd02 | 337 | } |
cb63cf9e JB |
338 | SCM_SYSCALL (fdes = open (file, flags, 0666)); |
339 | if (fdes == -1) | |
e145dd02 | 340 | { |
cb63cf9e JB |
341 | int en = errno; |
342 | ||
5d2d2ffc | 343 | SCM_SYSERROR_MSG ("~A: ~S", |
cb63cf9e | 344 | scm_cons (scm_makfrom0str (strerror (en)), |
5d2d2ffc | 345 | scm_cons (filename, SCM_EOL)), en); |
0f2d19dd | 346 | } |
cb63cf9e | 347 | port = scm_fdes_to_port (fdes, mode, filename); |
0f2d19dd JB |
348 | return port; |
349 | } | |
1bbd0b84 | 350 | #undef FUNC_NAME |
0f2d19dd | 351 | |
e145dd02 | 352 | \f |
cb63cf9e | 353 | /* Building Guile ports from a file descriptor. */ |
e145dd02 | 354 | |
cb63cf9e | 355 | /* Build a Scheme port from an open file descriptor `fdes'. |
a089567e JB |
356 | MODE indicates whether FILE is open for reading or writing; it uses |
357 | the same notation as open-file's second argument. | |
19b27fa2 GH |
358 | NAME is a string to be used as the port's filename. |
359 | */ | |
a089567e | 360 | SCM |
cb63cf9e | 361 | scm_fdes_to_port (int fdes, char *mode, SCM name) |
19b27fa2 | 362 | #define FUNC_NAME "scm_fdes_to_port" |
a089567e JB |
363 | { |
364 | long mode_bits = scm_mode_bits (mode); | |
365 | SCM port; | |
840ae05d | 366 | scm_port *pt; |
19b27fa2 GH |
367 | int flags; |
368 | ||
369 | /* test that fdes is valid. */ | |
370 | flags = fcntl (fdes, F_GETFL, 0); | |
371 | if (flags == -1) | |
372 | SCM_SYSERROR; | |
373 | flags &= O_ACCMODE; | |
374 | if (flags != O_RDWR | |
375 | && ((flags != O_WRONLY && (mode_bits & SCM_WRTNG)) | |
376 | || (flags != O_RDONLY && (mode_bits & SCM_RDNG)))) | |
377 | { | |
378 | SCM_MISC_ERROR ("requested file mode not available on fdes", SCM_EOL); | |
379 | } | |
a089567e JB |
380 | |
381 | SCM_NEWCELL (port); | |
382 | SCM_DEFER_INTS; | |
cb63cf9e JB |
383 | pt = scm_add_to_port_table (port); |
384 | SCM_SETPTAB_ENTRY (port, pt); | |
54778cd3 | 385 | SCM_SET_CELL_TYPE (port, (scm_tc16_fport | mode_bits)); |
cb63cf9e | 386 | |
a089567e | 387 | { |
cb63cf9e | 388 | struct scm_fport *fp |
840ae05d JB |
389 | = (struct scm_fport *) malloc (sizeof (struct scm_fport)); |
390 | if (fp == NULL) | |
19b27fa2 | 391 | SCM_MEMORY_ERROR; |
cb63cf9e | 392 | fp->fdes = fdes; |
0de97b83 | 393 | pt->rw_random = SCM_FDES_RANDOM_P (fdes); |
cb63cf9e JB |
394 | SCM_SETSTREAM (port, fp); |
395 | if (mode_bits & SCM_BUF0) | |
396 | scm_fport_buffer_add (port, 0, 0); | |
397 | else | |
398 | scm_fport_buffer_add (port, -1, -1); | |
a089567e | 399 | } |
b24b5e13 | 400 | SCM_SET_FILENAME (port, name); |
a089567e | 401 | SCM_ALLOW_INTS; |
e145dd02 JB |
402 | return port; |
403 | } | |
19b27fa2 | 404 | #undef FUNC_NAME |
e145dd02 | 405 | |
affc96b5 | 406 | /* Return a lower bound on the number of bytes available for input. */ |
cb63cf9e | 407 | static int |
affc96b5 | 408 | fport_input_waiting (SCM port) |
e145dd02 | 409 | { |
cb63cf9e JB |
410 | int fdes = SCM_FSTREAM (port)->fdes; |
411 | ||
412 | #ifdef HAVE_SELECT | |
413 | struct timeval timeout; | |
414 | SELECT_TYPE read_set; | |
415 | SELECT_TYPE write_set; | |
416 | SELECT_TYPE except_set; | |
417 | ||
418 | FD_ZERO (&read_set); | |
419 | FD_ZERO (&write_set); | |
420 | FD_ZERO (&except_set); | |
421 | ||
422 | FD_SET (fdes, &read_set); | |
423 | ||
424 | timeout.tv_sec = 0; | |
425 | timeout.tv_usec = 0; | |
426 | ||
427 | if (select (SELECT_SET_SIZE, | |
428 | &read_set, &write_set, &except_set, &timeout) | |
429 | < 0) | |
affc96b5 GH |
430 | scm_syserror ("fport_input_waiting"); |
431 | return FD_ISSET (fdes, &read_set) ? 1 : 0; | |
cb63cf9e JB |
432 | #elif defined (FIONREAD) |
433 | int remir; | |
434 | ioctl(fdes, FIONREAD, &remir); | |
435 | return remir; | |
436 | #else | |
affc96b5 | 437 | scm_misc_error ("fport_input_waiting", |
cb63cf9e JB |
438 | "Not fully implemented on this platform", |
439 | SCM_EOL); | |
440 | #endif | |
a089567e JB |
441 | } |
442 | ||
cb63cf9e | 443 | \f |
0f2d19dd | 444 | static int |
e841c3e0 | 445 | fport_print (SCM exp, SCM port, scm_print_state *pstate) |
0f2d19dd | 446 | { |
b3ec3c64 MD |
447 | scm_puts ("#<", port); |
448 | scm_print_port_mode (exp, port); | |
449 | if (SCM_OPFPORTP (exp)) | |
0f2d19dd | 450 | { |
b3ec3c64 | 451 | int fdes; |
b24b5e13 DH |
452 | SCM name = SCM_FILENAME (exp); |
453 | if (SCM_STRINGP (name) || SCM_SYMBOLP (name)) | |
454 | scm_display (name, port); | |
455 | else | |
456 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); | |
b3ec3c64 MD |
457 | scm_putc (' ', port); |
458 | fdes = (SCM_FSTREAM (exp))->fdes; | |
459 | ||
460 | if (isatty (fdes)) | |
461 | scm_puts (ttyname (fdes), port); | |
462 | else | |
463 | scm_intprint (fdes, 10, port); | |
0f2d19dd JB |
464 | } |
465 | else | |
466 | { | |
b3ec3c64 MD |
467 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); |
468 | scm_putc (' ', port); | |
f1267706 | 469 | scm_intprint (SCM_UNPACK (SCM_CDR (exp)), 16, port); |
0f2d19dd | 470 | } |
b3ec3c64 MD |
471 | scm_putc ('>', port); |
472 | return 1; | |
0f2d19dd JB |
473 | } |
474 | ||
cb63cf9e JB |
475 | #ifdef GUILE_ISELECT |
476 | /* thread-local block for input on fport's fdes. */ | |
477 | static void | |
478 | fport_wait_for_input (SCM port) | |
3cb988bd | 479 | { |
cb63cf9e | 480 | int fdes = SCM_FSTREAM (port)->fdes; |
3cb988bd | 481 | |
affc96b5 | 482 | if (!fport_input_waiting (port)) |
8122b543 | 483 | { |
cb63cf9e JB |
484 | int n; |
485 | SELECT_TYPE readfds; | |
486 | int flags = fcntl (fdes, F_GETFL); | |
487 | ||
488 | if (flags == -1) | |
489 | scm_syserror ("scm_fdes_wait_for_input"); | |
490 | if (!(flags & O_NONBLOCK)) | |
491 | do | |
492 | { | |
493 | FD_ZERO (&readfds); | |
494 | FD_SET (fdes, &readfds); | |
495 | n = scm_internal_select (fdes + 1, &readfds, NULL, NULL, NULL); | |
496 | } | |
497 | while (n == -1 && errno == EINTR); | |
8122b543 | 498 | } |
3cb988bd | 499 | } |
0f2d19dd JB |
500 | #endif |
501 | ||
affc96b5 | 502 | static void fport_flush (SCM port); |
0f2d19dd | 503 | |
c2da2648 GH |
504 | /* fill a port's read-buffer with a single read. returns the first |
505 | char or EOF if end of file. */ | |
0f2d19dd | 506 | static int |
affc96b5 | 507 | fport_fill_input (SCM port) |
0f2d19dd | 508 | { |
cb63cf9e | 509 | int count; |
840ae05d | 510 | scm_port *pt = SCM_PTAB_ENTRY (port); |
cb63cf9e JB |
511 | struct scm_fport *fp = SCM_FSTREAM (port); |
512 | ||
cb63cf9e JB |
513 | #ifdef GUILE_ISELECT |
514 | fport_wait_for_input (port); | |
515 | #endif | |
516 | SCM_SYSCALL (count = read (fp->fdes, pt->read_buf, pt->read_buf_size)); | |
517 | if (count == -1) | |
affc96b5 | 518 | scm_syserror ("fport_fill_input"); |
cb63cf9e JB |
519 | if (count == 0) |
520 | return EOF; | |
521 | else | |
522 | { | |
5c070ca7 | 523 | pt->read_pos = pt->read_buf; |
cb63cf9e | 524 | pt->read_end = pt->read_buf + count; |
5c070ca7 | 525 | return *pt->read_buf; |
cb63cf9e | 526 | } |
0f2d19dd JB |
527 | } |
528 | ||
cb63cf9e | 529 | static off_t |
affc96b5 | 530 | fport_seek (SCM port, off_t offset, int whence) |
0f2d19dd | 531 | { |
7dcb364d | 532 | scm_port *pt = SCM_PTAB_ENTRY (port); |
cb63cf9e | 533 | struct scm_fport *fp = SCM_FSTREAM (port); |
7dcb364d GH |
534 | off_t rv; |
535 | off_t result; | |
536 | ||
537 | if (pt->rw_active == SCM_PORT_WRITE) | |
538 | { | |
539 | if (offset != 0 || whence != SEEK_CUR) | |
540 | { | |
541 | fport_flush (port); | |
542 | result = rv = lseek (fp->fdes, offset, whence); | |
543 | } | |
544 | else | |
545 | { | |
546 | /* read current position without disturbing the buffer. */ | |
547 | rv = lseek (fp->fdes, offset, whence); | |
548 | result = rv + (pt->write_pos - pt->write_buf); | |
549 | } | |
550 | } | |
551 | else if (pt->rw_active == SCM_PORT_READ) | |
552 | { | |
553 | if (offset != 0 || whence != SEEK_CUR) | |
554 | { | |
555 | /* could expand to avoid a second seek. */ | |
556 | scm_end_input (port); | |
557 | result = rv = lseek (fp->fdes, offset, whence); | |
558 | } | |
559 | else | |
560 | { | |
561 | /* read current position without disturbing the buffer | |
562 | (particularly the unread-char buffer). */ | |
563 | rv = lseek (fp->fdes, offset, whence); | |
564 | result = rv - (pt->read_end - pt->read_pos); | |
565 | ||
566 | if (pt->read_buf == pt->putback_buf) | |
567 | result -= pt->saved_read_end - pt->saved_read_pos; | |
568 | } | |
569 | } | |
570 | else /* SCM_PORT_NEITHER */ | |
571 | { | |
572 | result = rv = lseek (fp->fdes, offset, whence); | |
573 | } | |
cb8dfa3f | 574 | |
7dcb364d | 575 | if (rv == -1) |
affc96b5 | 576 | scm_syserror ("fport_seek"); |
7dcb364d | 577 | |
cb8dfa3f | 578 | return result; |
0f2d19dd JB |
579 | } |
580 | ||
840ae05d | 581 | static void |
affc96b5 | 582 | fport_truncate (SCM port, off_t length) |
840ae05d JB |
583 | { |
584 | struct scm_fport *fp = SCM_FSTREAM (port); | |
585 | ||
586 | if (ftruncate (fp->fdes, length) == -1) | |
587 | scm_syserror ("ftruncate"); | |
588 | } | |
589 | ||
0c6d2191 GH |
590 | /* helper for fport_write: try to write data, using multiple system |
591 | calls if required. */ | |
592 | #define FUNC_NAME "write_all" | |
593 | static void write_all (SCM port, const void *data, size_t remaining) | |
594 | { | |
595 | int fdes = SCM_FSTREAM (port)->fdes; | |
596 | ||
597 | while (remaining > 0) | |
598 | { | |
599 | ssize_t done; | |
600 | ||
601 | SCM_SYSCALL (done = write (fdes, data, remaining)); | |
602 | ||
603 | if (done == -1) | |
604 | SCM_SYSERROR; | |
605 | remaining -= done; | |
606 | data = ((const char *) data) + done; | |
607 | } | |
608 | } | |
609 | #undef FUNC_NAME | |
610 | ||
31703ab8 | 611 | static void |
8aa011a1 | 612 | fport_write (SCM port, const void *data, size_t size) |
31703ab8 | 613 | { |
0c6d2191 | 614 | /* this procedure tries to minimize the number of writes/flushes. */ |
31703ab8 GH |
615 | scm_port *pt = SCM_PTAB_ENTRY (port); |
616 | ||
0c6d2191 GH |
617 | if (pt->write_buf == &pt->shortbuf |
618 | || (pt->write_pos == pt->write_buf && size >= pt->write_buf_size)) | |
31703ab8 | 619 | { |
0c6d2191 GH |
620 | /* "unbuffered" port, or |
621 | port with empty buffer and data won't fit in buffer. */ | |
622 | write_all (port, data, size); | |
623 | return; | |
31703ab8 | 624 | } |
d3639214 | 625 | |
0c6d2191 GH |
626 | { |
627 | off_t space = pt->write_end - pt->write_pos; | |
628 | ||
629 | if (size <= space) | |
630 | { | |
631 | /* data fits in buffer. */ | |
632 | memcpy (pt->write_pos, data, size); | |
633 | pt->write_pos += size; | |
634 | if (pt->write_pos == pt->write_end) | |
635 | { | |
affc96b5 | 636 | fport_flush (port); |
0c6d2191 GH |
637 | /* we can skip the line-buffering check if nothing's buffered. */ |
638 | return; | |
639 | } | |
640 | } | |
641 | else | |
642 | { | |
643 | memcpy (pt->write_pos, data, space); | |
644 | pt->write_pos = pt->write_end; | |
645 | fport_flush (port); | |
646 | { | |
647 | const void *ptr = ((const char *) data) + space; | |
648 | size_t remaining = size - space; | |
649 | ||
650 | if (size >= pt->write_buf_size) | |
651 | { | |
652 | write_all (port, ptr, remaining); | |
653 | return; | |
654 | } | |
655 | else | |
656 | { | |
657 | memcpy (pt->write_pos, ptr, remaining); | |
658 | pt->write_pos += remaining; | |
659 | } | |
31703ab8 | 660 | } |
0c6d2191 | 661 | } |
31703ab8 | 662 | |
0c6d2191 GH |
663 | /* handle line buffering. */ |
664 | if ((SCM_CELL_WORD_0 (port) & SCM_BUFLINE) && memchr (data, '\n', size)) | |
665 | fport_flush (port); | |
666 | } | |
31703ab8 GH |
667 | } |
668 | ||
669 | /* becomes 1 when process is exiting: normal exception handling won't | |
670 | work by this time. */ | |
cb63cf9e | 671 | extern int terminating; |
0f2d19dd | 672 | |
cb63cf9e | 673 | static void |
affc96b5 | 674 | fport_flush (SCM port) |
0f2d19dd | 675 | { |
840ae05d | 676 | scm_port *pt = SCM_PTAB_ENTRY (port); |
cb63cf9e | 677 | struct scm_fport *fp = SCM_FSTREAM (port); |
6f760c1d | 678 | unsigned char *ptr = pt->write_buf; |
cb63cf9e JB |
679 | int init_size = pt->write_pos - pt->write_buf; |
680 | int remaining = init_size; | |
0f2d19dd | 681 | |
cb63cf9e JB |
682 | while (remaining > 0) |
683 | { | |
684 | int count; | |
685 | ||
686 | SCM_SYSCALL (count = write (fp->fdes, ptr, remaining)); | |
687 | if (count < 0) | |
688 | { | |
689 | /* error. assume nothing was written this call, but | |
690 | fix up the buffer for any previous successful writes. */ | |
691 | int done = init_size - remaining; | |
692 | ||
693 | if (done > 0) | |
694 | { | |
695 | int i; | |
696 | ||
697 | for (i = 0; i < remaining; i++) | |
698 | { | |
699 | *(pt->write_buf + i) = *(pt->write_buf + done + i); | |
700 | } | |
701 | pt->write_pos = pt->write_buf + remaining; | |
702 | } | |
6b72ac1d | 703 | if (terminating) |
cb63cf9e JB |
704 | { |
705 | const char *msg = "Error: could not flush file-descriptor "; | |
706 | char buf[11]; | |
707 | ||
708 | write (2, msg, strlen (msg)); | |
709 | sprintf (buf, "%d\n", fp->fdes); | |
710 | write (2, buf, strlen (buf)); | |
711 | ||
712 | count = remaining; | |
713 | } | |
6b72ac1d GH |
714 | else if (scm_gc_running_p) |
715 | { | |
716 | /* silently ignore the error. scm_error would abort if we | |
717 | called it now. */ | |
718 | count = remaining; | |
719 | } | |
720 | else | |
721 | scm_syserror ("fport_flush"); | |
cb63cf9e JB |
722 | } |
723 | ptr += count; | |
724 | remaining -= count; | |
725 | } | |
726 | pt->write_pos = pt->write_buf; | |
61e452ba | 727 | pt->rw_active = SCM_PORT_NEITHER; |
840ae05d JB |
728 | } |
729 | ||
283a1a0e | 730 | /* clear the read buffer and adjust the file position for unread bytes. */ |
840ae05d | 731 | static void |
affc96b5 | 732 | fport_end_input (SCM port, int offset) |
840ae05d JB |
733 | { |
734 | struct scm_fport *fp = SCM_FSTREAM (port); | |
735 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
283a1a0e GH |
736 | |
737 | offset += pt->read_end - pt->read_pos; | |
840ae05d | 738 | |
840ae05d JB |
739 | if (offset > 0) |
740 | { | |
741 | pt->read_pos = pt->read_end; | |
742 | /* will throw error if unread-char used at beginning of file | |
743 | then attempting to write. seems correct. */ | |
744 | if (lseek (fp->fdes, -offset, SEEK_CUR) == -1) | |
affc96b5 | 745 | scm_syserror ("fport_end_input"); |
840ae05d | 746 | } |
61e452ba | 747 | pt->rw_active = SCM_PORT_NEITHER; |
8f29fbd0 JB |
748 | } |
749 | ||
6a2c4c81 | 750 | static int |
affc96b5 | 751 | fport_close (SCM port) |
6a2c4c81 | 752 | { |
cb63cf9e | 753 | struct scm_fport *fp = SCM_FSTREAM (port); |
840ae05d | 754 | scm_port *pt = SCM_PTAB_ENTRY (port); |
cb63cf9e | 755 | int rv; |
840ae05d | 756 | |
affc96b5 | 757 | fport_flush (port); |
cb63cf9e JB |
758 | SCM_SYSCALL (rv = close (fp->fdes)); |
759 | if (rv == -1 && errno != EBADF) | |
6b72ac1d GH |
760 | { |
761 | if (scm_gc_running_p) | |
762 | /* silently ignore the error. scm_error would abort if we | |
763 | called it now. */ | |
764 | ; | |
765 | else | |
766 | scm_syserror ("fport_close"); | |
767 | } | |
6c951427 GH |
768 | if (pt->read_buf == pt->putback_buf) |
769 | pt->read_buf = pt->saved_read_buf; | |
cb63cf9e | 770 | if (pt->read_buf != &pt->shortbuf) |
840ae05d | 771 | free (pt->read_buf); |
cb63cf9e | 772 | if (pt->write_buf != &pt->shortbuf) |
840ae05d JB |
773 | free (pt->write_buf); |
774 | free ((char *) fp); | |
cb63cf9e | 775 | return rv; |
6a2c4c81 JB |
776 | } |
777 | ||
b3ec3c64 | 778 | static scm_sizet |
affc96b5 | 779 | fport_free (SCM port) |
b3ec3c64 | 780 | { |
affc96b5 | 781 | fport_close (port); |
b3ec3c64 MD |
782 | return 0; |
783 | } | |
784 | ||
a98bddfd | 785 | static scm_bits_t |
b3ec3c64 MD |
786 | scm_make_fptob () |
787 | { | |
a98bddfd DH |
788 | scm_bits_t tc = scm_make_port_type ("file", fport_fill_input, fport_write); |
789 | ||
affc96b5 | 790 | scm_set_port_free (tc, fport_free); |
e841c3e0 | 791 | scm_set_port_print (tc, fport_print); |
affc96b5 GH |
792 | scm_set_port_flush (tc, fport_flush); |
793 | scm_set_port_end_input (tc, fport_end_input); | |
794 | scm_set_port_close (tc, fport_close); | |
795 | scm_set_port_seek (tc, fport_seek); | |
796 | scm_set_port_truncate (tc, fport_truncate); | |
797 | scm_set_port_input_waiting (tc, fport_input_waiting); | |
a98bddfd DH |
798 | |
799 | return tc; | |
b3ec3c64 | 800 | } |
0f2d19dd | 801 | |
0f2d19dd JB |
802 | void |
803 | scm_init_fports () | |
0f2d19dd | 804 | { |
a98bddfd DH |
805 | scm_tc16_fport = scm_make_fptob (); |
806 | ||
7a6f1ffa GH |
807 | scm_sysintern ("_IOFBF", SCM_MAKINUM (_IOFBF)); |
808 | scm_sysintern ("_IOLBF", SCM_MAKINUM (_IOLBF)); | |
809 | scm_sysintern ("_IONBF", SCM_MAKINUM (_IONBF)); | |
a98bddfd DH |
810 | |
811 | #ifndef SCM_MAGIC_SNARFER | |
812 | #include "libguile/fports.x" | |
813 | #endif | |
0f2d19dd | 814 | } |
89e00824 ML |
815 | |
816 | /* | |
817 | Local Variables: | |
818 | c-file-style: "gnu" | |
819 | End: | |
820 | */ |