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 | |
19b27fa2 GH |
72 | /* default buffer size, used if the O/S won't supply a value. */ |
73 | static const int default_buffer_size = 1024; | |
74 | ||
cb63cf9e JB |
75 | /* create FPORT buffer with specified sizes (or -1 to use default size or |
76 | 0 for no buffer. */ | |
77 | static void | |
78 | scm_fport_buffer_add (SCM port, int read_size, int write_size) | |
e145dd02 | 79 | { |
cb63cf9e | 80 | struct scm_fport *fp = SCM_FSTREAM (port); |
b24b5e13 | 81 | scm_port *pt = SCM_PTAB_ENTRY (port); |
cb63cf9e | 82 | char *s_scm_fport_buffer_add = "scm_fport_buffer_add"; |
e145dd02 | 83 | |
cb63cf9e JB |
84 | if (read_size == -1 || write_size == -1) |
85 | { | |
86 | int default_size; | |
87 | #ifdef HAVE_ST_BLKSIZE | |
88 | struct stat st; | |
89 | ||
19b27fa2 GH |
90 | default_size = (fstat (fp->fdes, &st) == -1) ? default_buffer_size |
91 | : st.st_blksize; | |
cb63cf9e | 92 | #else |
19b27fa2 | 93 | default_size = default_buffer_size; |
cb63cf9e JB |
94 | #endif |
95 | if (read_size == -1) | |
96 | read_size = default_size; | |
97 | if (write_size == -1) | |
98 | write_size = default_size; | |
99 | } | |
0f2d19dd | 100 | |
f5f2dcff | 101 | if (SCM_INPUT_PORT_P (port) && read_size > 0) |
cb63cf9e | 102 | { |
840ae05d JB |
103 | pt->read_buf = malloc (read_size); |
104 | if (pt->read_buf == NULL) | |
105 | scm_memory_error (s_scm_fport_buffer_add); | |
cb63cf9e JB |
106 | pt->read_pos = pt->read_end = pt->read_buf; |
107 | pt->read_buf_size = read_size; | |
108 | } | |
109 | else | |
110 | { | |
840ae05d | 111 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; |
cb63cf9e JB |
112 | pt->read_buf_size = 1; |
113 | } | |
1717856b | 114 | |
f5f2dcff | 115 | if (SCM_OUTPUT_PORT_P (port) && write_size > 0) |
cb63cf9e | 116 | { |
840ae05d JB |
117 | pt->write_buf = malloc (write_size); |
118 | if (pt->write_buf == NULL) | |
119 | scm_memory_error (s_scm_fport_buffer_add); | |
cb63cf9e JB |
120 | pt->write_pos = pt->write_buf; |
121 | pt->write_buf_size = write_size; | |
122 | } | |
123 | else | |
124 | { | |
125 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
126 | pt->write_buf_size = 1; | |
127 | } | |
128 | ||
129 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
130 | if (read_size > 0 || write_size > 0) | |
54778cd3 | 131 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0); |
cb63cf9e | 132 | else |
54778cd3 | 133 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUF0); |
7a6f1ffa GH |
134 | } |
135 | ||
a1ec6916 | 136 | SCM_DEFINE (scm_setvbuf, "setvbuf", 2, 1, 0, |
1bbd0b84 | 137 | (SCM port, SCM mode, SCM size), |
fc0d72d4 MD |
138 | "Set the buffering mode for @var{port}. @var{mode} can be:\n" |
139 | "@table @code\n" | |
140 | "@item _IONBF\n" | |
141 | "non-buffered\n" | |
142 | "@item _IOLBF\n" | |
143 | "line buffered\n" | |
144 | "@item _IOFBF\n" | |
145 | "block buffered, using a newly allocated buffer of @var{size} bytes.\n" | |
146 | "If @var{size} is omitted, a default size will be used.\n" | |
2c1ae20e | 147 | "@end table") |
1bbd0b84 | 148 | #define FUNC_NAME s_scm_setvbuf |
7a6f1ffa | 149 | { |
7a6f1ffa | 150 | int cmode, csize; |
840ae05d | 151 | scm_port *pt; |
7a6f1ffa | 152 | |
78446828 MV |
153 | port = SCM_COERCE_OUTPORT (port); |
154 | ||
3b3b36dd GB |
155 | SCM_VALIDATE_OPFPORT (1,port); |
156 | SCM_VALIDATE_INUM_COPY (2,mode,cmode); | |
d3639214 | 157 | if (cmode != _IONBF && cmode != _IOFBF && cmode != _IOLBF) |
1bbd0b84 | 158 | scm_out_of_range (FUNC_NAME, mode); |
d3639214 GH |
159 | |
160 | if (cmode == _IOLBF) | |
161 | { | |
54778cd3 | 162 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUFLINE); |
d3639214 GH |
163 | cmode = _IOFBF; |
164 | } | |
165 | else | |
166 | { | |
54778cd3 | 167 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) ^ SCM_BUFLINE); |
d3639214 GH |
168 | } |
169 | ||
7a6f1ffa | 170 | if (SCM_UNBNDP (size)) |
cb63cf9e JB |
171 | { |
172 | if (cmode == _IOFBF) | |
173 | csize = -1; | |
174 | else | |
175 | csize = 0; | |
176 | } | |
7a6f1ffa GH |
177 | else |
178 | { | |
3b3b36dd | 179 | SCM_VALIDATE_INUM_COPY (3,size,csize); |
cb63cf9e | 180 | if (csize < 0 || (cmode == _IONBF && csize > 0)) |
1bbd0b84 | 181 | scm_out_of_range (FUNC_NAME, size); |
7a6f1ffa | 182 | } |
d3639214 | 183 | |
cb63cf9e | 184 | pt = SCM_PTAB_ENTRY (port); |
7a6f1ffa | 185 | |
cb63cf9e JB |
186 | /* silently discards buffered chars. */ |
187 | if (pt->read_buf != &pt->shortbuf) | |
f30c9c8f | 188 | free (pt->read_buf); |
cb63cf9e | 189 | if (pt->write_buf != &pt->shortbuf) |
f30c9c8f | 190 | free (pt->write_buf); |
7a6f1ffa | 191 | |
cb63cf9e JB |
192 | scm_fport_buffer_add (port, csize, csize); |
193 | return SCM_UNSPECIFIED; | |
0f2d19dd | 194 | } |
1bbd0b84 | 195 | #undef FUNC_NAME |
0f2d19dd | 196 | |
eadd48de GH |
197 | /* Move ports with the specified file descriptor to new descriptors, |
198 | * reseting the revealed count to 0. | |
0f2d19dd | 199 | */ |
1717856b | 200 | |
eadd48de | 201 | void |
6e8d25a6 | 202 | scm_evict_ports (int fd) |
0f2d19dd | 203 | { |
eadd48de | 204 | int i; |
0f2d19dd | 205 | |
eadd48de GH |
206 | for (i = 0; i < scm_port_table_size; i++) |
207 | { | |
cb63cf9e JB |
208 | SCM port = scm_port_table[i]->port; |
209 | ||
210 | if (SCM_FPORTP (port)) | |
eadd48de | 211 | { |
cb63cf9e JB |
212 | struct scm_fport *fp = SCM_FSTREAM (port); |
213 | ||
214 | if (fp->fdes == fd) | |
215 | { | |
216 | fp->fdes = dup (fd); | |
217 | if (fp->fdes == -1) | |
218 | scm_syserror ("scm_evict_ports"); | |
219 | scm_set_port_revealed_x (port, SCM_MAKINUM (0)); | |
220 | } | |
eadd48de GH |
221 | } |
222 | } | |
223 | } | |
0f2d19dd JB |
224 | |
225 | /* scm_open_file | |
226 | * Return a new port open on a given file. | |
227 | * | |
228 | * The mode string must match the pattern: [rwa+]** which | |
229 | * is interpreted in the usual unix way. | |
230 | * | |
231 | * Return the new port. | |
232 | */ | |
3b3b36dd | 233 | SCM_DEFINE (scm_open_file, "open-file", 2, 0, 0, |
1bbd0b84 | 234 | (SCM filename, SCM modes), |
fc0d72d4 MD |
235 | "Open the file whose name is @var{string}, and return a port\n" |
236 | "representing that file. The attributes of the port are\n" | |
237 | "determined by the @var{mode} string. The way in \n" | |
238 | "which this is interpreted is similar to C stdio:\n\n" | |
239 | "The first character must be one of the following:\n\n" | |
240 | "@table @samp\n" | |
241 | "@item r\n" | |
242 | "Open an existing file for input.\n" | |
243 | "@item w\n" | |
244 | "Open a file for output, creating it if it doesn't already exist\n" | |
245 | "or removing its contents if it does.\n" | |
246 | "@item a\n" | |
247 | "Open a file for output, creating it if it doesn't already exist.\n" | |
248 | "All writes to the port will go to the end of the file.\n" | |
249 | "The \"append mode\" can be turned off while the port is in use\n" | |
250 | "@pxref{Ports and File Descriptors, fcntl}\n" | |
251 | "@end table\n\n" | |
252 | "The following additional characters can be appended:\n\n" | |
253 | "@table @samp\n" | |
254 | "@item +\n" | |
255 | "Open the port for both input and output. E.g., @code{r+}: open\n" | |
256 | "an existing file for both input and output.\n" | |
257 | "@item 0\n" | |
258 | "Create an \"unbuffered\" port. In this case input and output operations\n" | |
259 | "are passed directly to the underlying port implementation without\n" | |
260 | "additional buffering. This is likely to slow down I/O operations.\n" | |
261 | "The buffering mode can be changed while a port is in use\n" | |
262 | "@pxref{Ports and File Descriptors, setvbuf}\n" | |
263 | "@item l\n" | |
264 | "Add line-buffering to the port. The port output buffer will be\n" | |
265 | "automatically flushed whenever a newline character is written.\n" | |
266 | "@end table\n\n" | |
267 | "In theory we could create read/write ports which were buffered in one\n" | |
268 | "direction only. However this isn't included in the current interfaces.\n\n" | |
269 | "If a file cannot be opened with the access requested,\n" | |
270 | "@code{open-file} throws an exception.") | |
1bbd0b84 | 271 | #define FUNC_NAME s_scm_open_file |
0f2d19dd | 272 | { |
19639113 | 273 | SCM port; |
cb63cf9e JB |
274 | int fdes; |
275 | int flags = 0; | |
19639113 GH |
276 | char *file; |
277 | char *mode; | |
cb63cf9e | 278 | char *ptr; |
19639113 | 279 | |
a6d9e5ab DH |
280 | SCM_VALIDATE_STRING (1, filename); |
281 | SCM_VALIDATE_STRING (2, modes); | |
282 | SCM_STRING_COERCE_0TERMINATION_X (filename); | |
283 | SCM_STRING_COERCE_0TERMINATION_X (modes); | |
19639113 | 284 | |
a6d9e5ab DH |
285 | file = SCM_STRING_CHARS (filename); |
286 | mode = SCM_STRING_CHARS (modes); | |
19639113 | 287 | |
cb63cf9e | 288 | switch (*mode) |
0f2d19dd | 289 | { |
cb63cf9e JB |
290 | case 'r': |
291 | flags |= O_RDONLY; | |
292 | break; | |
293 | case 'w': | |
294 | flags |= O_WRONLY | O_CREAT | O_TRUNC; | |
295 | break; | |
296 | case 'a': | |
297 | flags |= O_WRONLY | O_CREAT | O_APPEND; | |
298 | break; | |
299 | default: | |
1bbd0b84 | 300 | scm_out_of_range (FUNC_NAME, modes); |
0f2d19dd | 301 | } |
cb63cf9e JB |
302 | ptr = mode + 1; |
303 | while (*ptr != '\0') | |
e145dd02 | 304 | { |
cb63cf9e JB |
305 | switch (*ptr) |
306 | { | |
307 | case '+': | |
308 | flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR; | |
309 | break; | |
9f561420 GH |
310 | case 'b': |
311 | #if defined (O_BINARY) | |
312 | flags |= O_BINARY; | |
313 | #endif | |
314 | break; | |
cb63cf9e | 315 | case '0': /* unbuffered: handled later. */ |
d3639214 | 316 | case 'l': /* line buffered: handled during output. */ |
cb63cf9e JB |
317 | break; |
318 | default: | |
1bbd0b84 | 319 | scm_out_of_range (FUNC_NAME, modes); |
cb63cf9e JB |
320 | } |
321 | ptr++; | |
e145dd02 | 322 | } |
cb63cf9e JB |
323 | SCM_SYSCALL (fdes = open (file, flags, 0666)); |
324 | if (fdes == -1) | |
e145dd02 | 325 | { |
cb63cf9e JB |
326 | int en = errno; |
327 | ||
5d2d2ffc | 328 | SCM_SYSERROR_MSG ("~A: ~S", |
cb63cf9e | 329 | scm_cons (scm_makfrom0str (strerror (en)), |
5d2d2ffc | 330 | scm_cons (filename, SCM_EOL)), en); |
0f2d19dd | 331 | } |
cb63cf9e | 332 | port = scm_fdes_to_port (fdes, mode, filename); |
0f2d19dd JB |
333 | return port; |
334 | } | |
1bbd0b84 | 335 | #undef FUNC_NAME |
0f2d19dd | 336 | |
e145dd02 | 337 | \f |
cb63cf9e | 338 | /* Building Guile ports from a file descriptor. */ |
e145dd02 | 339 | |
cb63cf9e | 340 | /* Build a Scheme port from an open file descriptor `fdes'. |
a089567e JB |
341 | MODE indicates whether FILE is open for reading or writing; it uses |
342 | the same notation as open-file's second argument. | |
19b27fa2 GH |
343 | NAME is a string to be used as the port's filename. |
344 | */ | |
a089567e | 345 | SCM |
cb63cf9e | 346 | scm_fdes_to_port (int fdes, char *mode, SCM name) |
19b27fa2 | 347 | #define FUNC_NAME "scm_fdes_to_port" |
a089567e JB |
348 | { |
349 | long mode_bits = scm_mode_bits (mode); | |
350 | SCM port; | |
840ae05d | 351 | scm_port *pt; |
19b27fa2 GH |
352 | int flags; |
353 | ||
354 | /* test that fdes is valid. */ | |
355 | flags = fcntl (fdes, F_GETFL, 0); | |
356 | if (flags == -1) | |
357 | SCM_SYSERROR; | |
358 | flags &= O_ACCMODE; | |
359 | if (flags != O_RDWR | |
360 | && ((flags != O_WRONLY && (mode_bits & SCM_WRTNG)) | |
361 | || (flags != O_RDONLY && (mode_bits & SCM_RDNG)))) | |
362 | { | |
363 | SCM_MISC_ERROR ("requested file mode not available on fdes", SCM_EOL); | |
364 | } | |
a089567e JB |
365 | |
366 | SCM_NEWCELL (port); | |
367 | SCM_DEFER_INTS; | |
cb63cf9e JB |
368 | pt = scm_add_to_port_table (port); |
369 | SCM_SETPTAB_ENTRY (port, pt); | |
54778cd3 | 370 | SCM_SET_CELL_TYPE (port, (scm_tc16_fport | mode_bits)); |
cb63cf9e | 371 | |
a089567e | 372 | { |
cb63cf9e | 373 | struct scm_fport *fp |
840ae05d JB |
374 | = (struct scm_fport *) malloc (sizeof (struct scm_fport)); |
375 | if (fp == NULL) | |
19b27fa2 | 376 | SCM_MEMORY_ERROR; |
cb63cf9e | 377 | fp->fdes = fdes; |
0de97b83 | 378 | pt->rw_random = SCM_FDES_RANDOM_P (fdes); |
cb63cf9e JB |
379 | SCM_SETSTREAM (port, fp); |
380 | if (mode_bits & SCM_BUF0) | |
381 | scm_fport_buffer_add (port, 0, 0); | |
382 | else | |
383 | scm_fport_buffer_add (port, -1, -1); | |
a089567e | 384 | } |
b24b5e13 | 385 | SCM_SET_FILENAME (port, name); |
a089567e | 386 | SCM_ALLOW_INTS; |
e145dd02 JB |
387 | return port; |
388 | } | |
19b27fa2 | 389 | #undef FUNC_NAME |
e145dd02 | 390 | |
affc96b5 | 391 | /* Return a lower bound on the number of bytes available for input. */ |
cb63cf9e | 392 | static int |
affc96b5 | 393 | fport_input_waiting (SCM port) |
e145dd02 | 394 | { |
cb63cf9e JB |
395 | int fdes = SCM_FSTREAM (port)->fdes; |
396 | ||
397 | #ifdef HAVE_SELECT | |
398 | struct timeval timeout; | |
399 | SELECT_TYPE read_set; | |
400 | SELECT_TYPE write_set; | |
401 | SELECT_TYPE except_set; | |
402 | ||
403 | FD_ZERO (&read_set); | |
404 | FD_ZERO (&write_set); | |
405 | FD_ZERO (&except_set); | |
406 | ||
407 | FD_SET (fdes, &read_set); | |
408 | ||
409 | timeout.tv_sec = 0; | |
410 | timeout.tv_usec = 0; | |
411 | ||
412 | if (select (SELECT_SET_SIZE, | |
413 | &read_set, &write_set, &except_set, &timeout) | |
414 | < 0) | |
affc96b5 GH |
415 | scm_syserror ("fport_input_waiting"); |
416 | return FD_ISSET (fdes, &read_set) ? 1 : 0; | |
cb63cf9e JB |
417 | #elif defined (FIONREAD) |
418 | int remir; | |
419 | ioctl(fdes, FIONREAD, &remir); | |
420 | return remir; | |
421 | #else | |
affc96b5 | 422 | scm_misc_error ("fport_input_waiting", |
cb63cf9e JB |
423 | "Not fully implemented on this platform", |
424 | SCM_EOL); | |
425 | #endif | |
a089567e JB |
426 | } |
427 | ||
cb63cf9e | 428 | \f |
0f2d19dd | 429 | static int |
e841c3e0 | 430 | fport_print (SCM exp, SCM port, scm_print_state *pstate) |
0f2d19dd | 431 | { |
b3ec3c64 MD |
432 | scm_puts ("#<", port); |
433 | scm_print_port_mode (exp, port); | |
434 | if (SCM_OPFPORTP (exp)) | |
0f2d19dd | 435 | { |
b3ec3c64 | 436 | int fdes; |
b24b5e13 DH |
437 | SCM name = SCM_FILENAME (exp); |
438 | if (SCM_STRINGP (name) || SCM_SYMBOLP (name)) | |
439 | scm_display (name, port); | |
440 | else | |
441 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); | |
b3ec3c64 MD |
442 | scm_putc (' ', port); |
443 | fdes = (SCM_FSTREAM (exp))->fdes; | |
444 | ||
445 | if (isatty (fdes)) | |
446 | scm_puts (ttyname (fdes), port); | |
447 | else | |
448 | scm_intprint (fdes, 10, port); | |
0f2d19dd JB |
449 | } |
450 | else | |
451 | { | |
b3ec3c64 MD |
452 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); |
453 | scm_putc (' ', port); | |
f1267706 | 454 | scm_intprint (SCM_UNPACK (SCM_CDR (exp)), 16, port); |
0f2d19dd | 455 | } |
b3ec3c64 MD |
456 | scm_putc ('>', port); |
457 | return 1; | |
0f2d19dd JB |
458 | } |
459 | ||
cb63cf9e JB |
460 | #ifdef GUILE_ISELECT |
461 | /* thread-local block for input on fport's fdes. */ | |
462 | static void | |
463 | fport_wait_for_input (SCM port) | |
3cb988bd | 464 | { |
cb63cf9e | 465 | int fdes = SCM_FSTREAM (port)->fdes; |
3cb988bd | 466 | |
affc96b5 | 467 | if (!fport_input_waiting (port)) |
8122b543 | 468 | { |
cb63cf9e JB |
469 | int n; |
470 | SELECT_TYPE readfds; | |
471 | int flags = fcntl (fdes, F_GETFL); | |
472 | ||
473 | if (flags == -1) | |
474 | scm_syserror ("scm_fdes_wait_for_input"); | |
475 | if (!(flags & O_NONBLOCK)) | |
476 | do | |
477 | { | |
478 | FD_ZERO (&readfds); | |
479 | FD_SET (fdes, &readfds); | |
480 | n = scm_internal_select (fdes + 1, &readfds, NULL, NULL, NULL); | |
481 | } | |
482 | while (n == -1 && errno == EINTR); | |
8122b543 | 483 | } |
3cb988bd | 484 | } |
0f2d19dd JB |
485 | #endif |
486 | ||
affc96b5 | 487 | static void fport_flush (SCM port); |
0f2d19dd | 488 | |
cb63cf9e JB |
489 | /* fill a port's read-buffer with a single read. |
490 | returns the first char and moves the read_pos pointer past it. | |
491 | or returns EOF if end of file. */ | |
0f2d19dd | 492 | static int |
affc96b5 | 493 | fport_fill_input (SCM port) |
0f2d19dd | 494 | { |
cb63cf9e | 495 | int count; |
840ae05d | 496 | scm_port *pt = SCM_PTAB_ENTRY (port); |
cb63cf9e JB |
497 | struct scm_fport *fp = SCM_FSTREAM (port); |
498 | ||
cb63cf9e JB |
499 | #ifdef GUILE_ISELECT |
500 | fport_wait_for_input (port); | |
501 | #endif | |
502 | SCM_SYSCALL (count = read (fp->fdes, pt->read_buf, pt->read_buf_size)); | |
503 | if (count == -1) | |
affc96b5 | 504 | scm_syserror ("fport_fill_input"); |
cb63cf9e JB |
505 | if (count == 0) |
506 | return EOF; | |
507 | else | |
508 | { | |
5c070ca7 | 509 | pt->read_pos = pt->read_buf; |
cb63cf9e | 510 | pt->read_end = pt->read_buf + count; |
5c070ca7 | 511 | return *pt->read_buf; |
cb63cf9e | 512 | } |
0f2d19dd JB |
513 | } |
514 | ||
cb63cf9e | 515 | static off_t |
affc96b5 | 516 | fport_seek (SCM port, off_t offset, int whence) |
0f2d19dd | 517 | { |
7dcb364d | 518 | scm_port *pt = SCM_PTAB_ENTRY (port); |
cb63cf9e | 519 | struct scm_fport *fp = SCM_FSTREAM (port); |
7dcb364d GH |
520 | off_t rv; |
521 | off_t result; | |
522 | ||
523 | if (pt->rw_active == SCM_PORT_WRITE) | |
524 | { | |
525 | if (offset != 0 || whence != SEEK_CUR) | |
526 | { | |
527 | fport_flush (port); | |
528 | result = rv = lseek (fp->fdes, offset, whence); | |
529 | } | |
530 | else | |
531 | { | |
532 | /* read current position without disturbing the buffer. */ | |
533 | rv = lseek (fp->fdes, offset, whence); | |
534 | result = rv + (pt->write_pos - pt->write_buf); | |
535 | } | |
536 | } | |
537 | else if (pt->rw_active == SCM_PORT_READ) | |
538 | { | |
539 | if (offset != 0 || whence != SEEK_CUR) | |
540 | { | |
541 | /* could expand to avoid a second seek. */ | |
542 | scm_end_input (port); | |
543 | result = rv = lseek (fp->fdes, offset, whence); | |
544 | } | |
545 | else | |
546 | { | |
547 | /* read current position without disturbing the buffer | |
548 | (particularly the unread-char buffer). */ | |
549 | rv = lseek (fp->fdes, offset, whence); | |
550 | result = rv - (pt->read_end - pt->read_pos); | |
551 | ||
552 | if (pt->read_buf == pt->putback_buf) | |
553 | result -= pt->saved_read_end - pt->saved_read_pos; | |
554 | } | |
555 | } | |
556 | else /* SCM_PORT_NEITHER */ | |
557 | { | |
558 | result = rv = lseek (fp->fdes, offset, whence); | |
559 | } | |
cb8dfa3f | 560 | |
7dcb364d | 561 | if (rv == -1) |
affc96b5 | 562 | scm_syserror ("fport_seek"); |
7dcb364d | 563 | |
cb8dfa3f | 564 | return result; |
0f2d19dd JB |
565 | } |
566 | ||
840ae05d | 567 | static void |
affc96b5 | 568 | fport_truncate (SCM port, off_t length) |
840ae05d JB |
569 | { |
570 | struct scm_fport *fp = SCM_FSTREAM (port); | |
571 | ||
572 | if (ftruncate (fp->fdes, length) == -1) | |
573 | scm_syserror ("ftruncate"); | |
574 | } | |
575 | ||
0c6d2191 GH |
576 | /* helper for fport_write: try to write data, using multiple system |
577 | calls if required. */ | |
578 | #define FUNC_NAME "write_all" | |
579 | static void write_all (SCM port, const void *data, size_t remaining) | |
580 | { | |
581 | int fdes = SCM_FSTREAM (port)->fdes; | |
582 | ||
583 | while (remaining > 0) | |
584 | { | |
585 | ssize_t done; | |
586 | ||
587 | SCM_SYSCALL (done = write (fdes, data, remaining)); | |
588 | ||
589 | if (done == -1) | |
590 | SCM_SYSERROR; | |
591 | remaining -= done; | |
592 | data = ((const char *) data) + done; | |
593 | } | |
594 | } | |
595 | #undef FUNC_NAME | |
596 | ||
31703ab8 | 597 | static void |
8aa011a1 | 598 | fport_write (SCM port, const void *data, size_t size) |
31703ab8 | 599 | { |
0c6d2191 | 600 | /* this procedure tries to minimize the number of writes/flushes. */ |
31703ab8 GH |
601 | scm_port *pt = SCM_PTAB_ENTRY (port); |
602 | ||
0c6d2191 GH |
603 | if (pt->write_buf == &pt->shortbuf |
604 | || (pt->write_pos == pt->write_buf && size >= pt->write_buf_size)) | |
31703ab8 | 605 | { |
0c6d2191 GH |
606 | /* "unbuffered" port, or |
607 | port with empty buffer and data won't fit in buffer. */ | |
608 | write_all (port, data, size); | |
609 | return; | |
31703ab8 | 610 | } |
d3639214 | 611 | |
0c6d2191 GH |
612 | { |
613 | off_t space = pt->write_end - pt->write_pos; | |
614 | ||
615 | if (size <= space) | |
616 | { | |
617 | /* data fits in buffer. */ | |
618 | memcpy (pt->write_pos, data, size); | |
619 | pt->write_pos += size; | |
620 | if (pt->write_pos == pt->write_end) | |
621 | { | |
affc96b5 | 622 | fport_flush (port); |
0c6d2191 GH |
623 | /* we can skip the line-buffering check if nothing's buffered. */ |
624 | return; | |
625 | } | |
626 | } | |
627 | else | |
628 | { | |
629 | memcpy (pt->write_pos, data, space); | |
630 | pt->write_pos = pt->write_end; | |
631 | fport_flush (port); | |
632 | { | |
633 | const void *ptr = ((const char *) data) + space; | |
634 | size_t remaining = size - space; | |
635 | ||
636 | if (size >= pt->write_buf_size) | |
637 | { | |
638 | write_all (port, ptr, remaining); | |
639 | return; | |
640 | } | |
641 | else | |
642 | { | |
643 | memcpy (pt->write_pos, ptr, remaining); | |
644 | pt->write_pos += remaining; | |
645 | } | |
31703ab8 | 646 | } |
0c6d2191 | 647 | } |
31703ab8 | 648 | |
0c6d2191 GH |
649 | /* handle line buffering. */ |
650 | if ((SCM_CELL_WORD_0 (port) & SCM_BUFLINE) && memchr (data, '\n', size)) | |
651 | fport_flush (port); | |
652 | } | |
31703ab8 GH |
653 | } |
654 | ||
655 | /* becomes 1 when process is exiting: normal exception handling won't | |
656 | work by this time. */ | |
cb63cf9e | 657 | extern int terminating; |
0f2d19dd | 658 | |
cb63cf9e | 659 | static void |
affc96b5 | 660 | fport_flush (SCM port) |
0f2d19dd | 661 | { |
840ae05d | 662 | scm_port *pt = SCM_PTAB_ENTRY (port); |
cb63cf9e | 663 | struct scm_fport *fp = SCM_FSTREAM (port); |
6f760c1d | 664 | unsigned char *ptr = pt->write_buf; |
cb63cf9e JB |
665 | int init_size = pt->write_pos - pt->write_buf; |
666 | int remaining = init_size; | |
0f2d19dd | 667 | |
cb63cf9e JB |
668 | while (remaining > 0) |
669 | { | |
670 | int count; | |
671 | ||
672 | SCM_SYSCALL (count = write (fp->fdes, ptr, remaining)); | |
673 | if (count < 0) | |
674 | { | |
675 | /* error. assume nothing was written this call, but | |
676 | fix up the buffer for any previous successful writes. */ | |
677 | int done = init_size - remaining; | |
678 | ||
679 | if (done > 0) | |
680 | { | |
681 | int i; | |
682 | ||
683 | for (i = 0; i < remaining; i++) | |
684 | { | |
685 | *(pt->write_buf + i) = *(pt->write_buf + done + i); | |
686 | } | |
687 | pt->write_pos = pt->write_buf + remaining; | |
688 | } | |
6b72ac1d | 689 | if (terminating) |
cb63cf9e JB |
690 | { |
691 | const char *msg = "Error: could not flush file-descriptor "; | |
692 | char buf[11]; | |
693 | ||
694 | write (2, msg, strlen (msg)); | |
695 | sprintf (buf, "%d\n", fp->fdes); | |
696 | write (2, buf, strlen (buf)); | |
697 | ||
698 | count = remaining; | |
699 | } | |
6b72ac1d GH |
700 | else if (scm_gc_running_p) |
701 | { | |
702 | /* silently ignore the error. scm_error would abort if we | |
703 | called it now. */ | |
704 | count = remaining; | |
705 | } | |
706 | else | |
707 | scm_syserror ("fport_flush"); | |
cb63cf9e JB |
708 | } |
709 | ptr += count; | |
710 | remaining -= count; | |
711 | } | |
712 | pt->write_pos = pt->write_buf; | |
61e452ba | 713 | pt->rw_active = SCM_PORT_NEITHER; |
840ae05d JB |
714 | } |
715 | ||
283a1a0e | 716 | /* clear the read buffer and adjust the file position for unread bytes. */ |
840ae05d | 717 | static void |
affc96b5 | 718 | fport_end_input (SCM port, int offset) |
840ae05d JB |
719 | { |
720 | struct scm_fport *fp = SCM_FSTREAM (port); | |
721 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
283a1a0e GH |
722 | |
723 | offset += pt->read_end - pt->read_pos; | |
840ae05d | 724 | |
840ae05d JB |
725 | if (offset > 0) |
726 | { | |
727 | pt->read_pos = pt->read_end; | |
728 | /* will throw error if unread-char used at beginning of file | |
729 | then attempting to write. seems correct. */ | |
730 | if (lseek (fp->fdes, -offset, SEEK_CUR) == -1) | |
affc96b5 | 731 | scm_syserror ("fport_end_input"); |
840ae05d | 732 | } |
61e452ba | 733 | pt->rw_active = SCM_PORT_NEITHER; |
8f29fbd0 JB |
734 | } |
735 | ||
6a2c4c81 | 736 | static int |
affc96b5 | 737 | fport_close (SCM port) |
6a2c4c81 | 738 | { |
cb63cf9e | 739 | struct scm_fport *fp = SCM_FSTREAM (port); |
840ae05d | 740 | scm_port *pt = SCM_PTAB_ENTRY (port); |
cb63cf9e | 741 | int rv; |
840ae05d | 742 | |
affc96b5 | 743 | fport_flush (port); |
cb63cf9e JB |
744 | SCM_SYSCALL (rv = close (fp->fdes)); |
745 | if (rv == -1 && errno != EBADF) | |
6b72ac1d GH |
746 | { |
747 | if (scm_gc_running_p) | |
748 | /* silently ignore the error. scm_error would abort if we | |
749 | called it now. */ | |
750 | ; | |
751 | else | |
752 | scm_syserror ("fport_close"); | |
753 | } | |
6c951427 GH |
754 | if (pt->read_buf == pt->putback_buf) |
755 | pt->read_buf = pt->saved_read_buf; | |
cb63cf9e | 756 | if (pt->read_buf != &pt->shortbuf) |
840ae05d | 757 | free (pt->read_buf); |
cb63cf9e | 758 | if (pt->write_buf != &pt->shortbuf) |
840ae05d JB |
759 | free (pt->write_buf); |
760 | free ((char *) fp); | |
cb63cf9e | 761 | return rv; |
6a2c4c81 JB |
762 | } |
763 | ||
b3ec3c64 | 764 | static scm_sizet |
affc96b5 | 765 | fport_free (SCM port) |
b3ec3c64 | 766 | { |
affc96b5 | 767 | fport_close (port); |
b3ec3c64 MD |
768 | return 0; |
769 | } | |
770 | ||
771 | void scm_make_fptob (void); /* Called from ports.c */ | |
772 | ||
773 | void | |
774 | scm_make_fptob () | |
775 | { | |
affc96b5 GH |
776 | long tc = scm_make_port_type ("file", fport_fill_input, fport_write); |
777 | scm_set_port_free (tc, fport_free); | |
e841c3e0 | 778 | scm_set_port_print (tc, fport_print); |
affc96b5 GH |
779 | scm_set_port_flush (tc, fport_flush); |
780 | scm_set_port_end_input (tc, fport_end_input); | |
781 | scm_set_port_close (tc, fport_close); | |
782 | scm_set_port_seek (tc, fport_seek); | |
783 | scm_set_port_truncate (tc, fport_truncate); | |
784 | scm_set_port_input_waiting (tc, fport_input_waiting); | |
b3ec3c64 | 785 | } |
0f2d19dd | 786 | |
0f2d19dd JB |
787 | void |
788 | scm_init_fports () | |
0f2d19dd | 789 | { |
8dc9439f | 790 | #ifndef SCM_MAGIC_SNARFER |
a0599745 | 791 | #include "libguile/fports.x" |
8dc9439f | 792 | #endif |
7a6f1ffa GH |
793 | scm_sysintern ("_IOFBF", SCM_MAKINUM (_IOFBF)); |
794 | scm_sysintern ("_IOLBF", SCM_MAKINUM (_IOLBF)); | |
795 | scm_sysintern ("_IONBF", SCM_MAKINUM (_IONBF)); | |
0f2d19dd | 796 | } |
89e00824 ML |
797 | |
798 | /* | |
799 | Local Variables: | |
800 | c-file-style: "gnu" | |
801 | End: | |
802 | */ |