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