Commit | Line | Data |
---|---|---|
f2c9fcb0 | 1 | /* Copyright (C) 1995,1996,1998,1999, 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 | ||
a0599745 | 47 | #include "libguile/_scm.h" |
681b9005 MD |
48 | |
49 | #include <stdio.h> | |
50 | #ifdef HAVE_UNISTD_H | |
51 | #include <unistd.h> | |
52 | #endif | |
53 | ||
a0599745 MD |
54 | #include "libguile/unif.h" |
55 | #include "libguile/eval.h" | |
56 | #include "libguile/ports.h" | |
57 | #include "libguile/read.h" | |
58 | #include "libguile/root.h" | |
59 | #include "libguile/strings.h" | |
07bcf91d | 60 | #include "libguile/modules.h" |
20e6290e | 61 | |
a0599745 | 62 | #include "libguile/strports.h" |
0f2d19dd | 63 | |
95b88819 GH |
64 | #ifdef HAVE_STRING_H |
65 | #include <string.h> | |
66 | #endif | |
67 | ||
0f2d19dd JB |
68 | \f |
69 | ||
70 | /* {Ports - string ports} | |
71 | * | |
72 | */ | |
73 | ||
3fe6190f GH |
74 | /* NOTES: |
75 | write_buf/write_end point to the ends of the allocated string. | |
76 | read_buf/read_end in principle point to the part of the string which | |
77 | has been written to, but this is only updated after a flush. | |
78 | read_pos and write_pos in principle should be equal, but this is only true | |
61e452ba | 79 | when rw_active is SCM_PORT_NEITHER. |
3fe6190f | 80 | */ |
1cc91f1b | 81 | |
a98bddfd DH |
82 | |
83 | static scm_bits_t scm_tc16_strport; | |
84 | ||
85 | ||
ee149d03 JB |
86 | static int |
87 | stfill_buffer (SCM port) | |
0f2d19dd | 88 | { |
754c9491 | 89 | scm_port *pt = SCM_PTAB_ENTRY (port); |
ee149d03 | 90 | |
ee149d03 JB |
91 | if (pt->read_pos >= pt->read_end) |
92 | return EOF; | |
93 | else | |
41b0806d | 94 | return scm_return_first_int (*pt->read_pos, port); |
0f2d19dd JB |
95 | } |
96 | ||
3fe6190f GH |
97 | /* change the size of a port's string to new_size. this doesn't |
98 | change read_buf_size. */ | |
754c9491 | 99 | static void |
3fe6190f | 100 | st_resize_port (scm_port *pt, off_t new_size) |
754c9491 | 101 | { |
94115ae3 DH |
102 | SCM old_stream = SCM_PACK (pt->stream); |
103 | SCM new_stream = scm_makstr (new_size, 0); | |
104 | unsigned long int old_size = SCM_STRING_LENGTH (old_stream); | |
105 | unsigned long int min_size = min (old_size, new_size); | |
106 | unsigned long int i; | |
74a16888 | 107 | |
3fe6190f GH |
108 | off_t index = pt->write_pos - pt->write_buf; |
109 | ||
110 | pt->write_buf_size = new_size; | |
111 | ||
94115ae3 DH |
112 | for (i = 0; i != min_size; ++i) |
113 | SCM_STRING_CHARS (new_stream) [i] = SCM_STRING_CHARS (old_stream) [i]; | |
754c9491 | 114 | |
94115ae3 | 115 | /* reset buffer. */ |
754c9491 | 116 | { |
94115ae3 DH |
117 | pt->stream = new_stream; |
118 | pt->read_buf = pt->write_buf = SCM_STRING_UCHARS (new_stream); | |
3fe6190f GH |
119 | pt->read_pos = pt->write_pos = pt->write_buf + index; |
120 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
121 | pt->read_end = pt->read_buf + pt->read_buf_size; | |
754c9491 JB |
122 | } |
123 | } | |
124 | ||
3fe6190f GH |
125 | /* amount by which write_buf is expanded. */ |
126 | #define SCM_WRITE_BLOCK 80 | |
127 | ||
128 | /* ensure that write_pos < write_end by enlarging the buffer when | |
129 | necessary. update read_buf to account for written chars. */ | |
ee149d03 JB |
130 | static void |
131 | st_flush (SCM port) | |
0f2d19dd | 132 | { |
754c9491 | 133 | scm_port *pt = SCM_PTAB_ENTRY (port); |
ee149d03 JB |
134 | |
135 | if (pt->write_pos == pt->write_end) | |
136 | { | |
3fe6190f | 137 | st_resize_port (pt, pt->write_buf_size + SCM_WRITE_BLOCK); |
754c9491 JB |
138 | } |
139 | pt->read_pos = pt->write_pos; | |
3fe6190f GH |
140 | if (pt->read_pos > pt->read_end) |
141 | { | |
142 | pt->read_end = (unsigned char *) pt->read_pos; | |
143 | pt->read_buf_size = pt->read_end - pt->read_buf; | |
144 | } | |
61e452ba | 145 | pt->rw_active = SCM_PORT_NEITHER; |
754c9491 JB |
146 | } |
147 | ||
31703ab8 | 148 | static void |
8aa011a1 | 149 | st_write (SCM port, const void *data, size_t size) |
31703ab8 GH |
150 | { |
151 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
152 | const char *input = (char *) data; | |
153 | ||
154 | while (size > 0) | |
155 | { | |
156 | int space = pt->write_end - pt->write_pos; | |
157 | int write_len = (size > space) ? space : size; | |
158 | ||
a4c7145b | 159 | strncpy ((char *) pt->write_pos, input, write_len); |
31703ab8 GH |
160 | pt->write_pos += write_len; |
161 | size -= write_len; | |
162 | input += write_len; | |
163 | if (write_len == space) | |
164 | st_flush (port); | |
165 | } | |
166 | } | |
167 | ||
754c9491 | 168 | static void |
affc96b5 | 169 | st_end_input (SCM port, int offset) |
754c9491 JB |
170 | { |
171 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
7dcb364d | 172 | |
cd19d608 GH |
173 | if (pt->read_pos - pt->read_buf < offset) |
174 | scm_misc_error ("st_end_input", "negative position", SCM_EOL); | |
175 | ||
a3c8b9fc | 176 | pt->write_pos = (unsigned char *) (pt->read_pos = pt->read_pos - offset); |
61e452ba | 177 | pt->rw_active = SCM_PORT_NEITHER; |
754c9491 JB |
178 | } |
179 | ||
180 | static off_t | |
181 | st_seek (SCM port, off_t offset, int whence) | |
182 | { | |
183 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
184 | off_t target; | |
185 | ||
7dcb364d GH |
186 | if (pt->rw_active == SCM_PORT_READ && offset == 0 && whence == SEEK_CUR) |
187 | /* special case to avoid disturbing the unread-char buffer. */ | |
754c9491 | 188 | { |
7dcb364d GH |
189 | if (pt->read_buf == pt->putback_buf) |
190 | { | |
191 | target = pt->saved_read_pos - pt->saved_read_buf | |
192 | - (pt->read_end - pt->read_pos); | |
193 | } | |
194 | else | |
195 | { | |
196 | target = pt->read_pos - pt->read_buf; | |
197 | } | |
754c9491 | 198 | } |
7dcb364d GH |
199 | else |
200 | /* all other cases. */ | |
754c9491 | 201 | { |
7dcb364d GH |
202 | if (pt->rw_active == SCM_PORT_WRITE) |
203 | st_flush (port); | |
204 | ||
205 | if (pt->rw_active == SCM_PORT_READ) | |
206 | scm_end_input (port); | |
207 | ||
208 | switch (whence) | |
209 | { | |
210 | case SEEK_CUR: | |
211 | target = pt->read_pos - pt->read_buf + offset; | |
212 | break; | |
213 | case SEEK_END: | |
214 | target = pt->read_end - pt->read_buf + offset; | |
215 | break; | |
216 | default: /* SEEK_SET */ | |
217 | target = offset; | |
218 | break; | |
219 | } | |
220 | ||
221 | if (target < 0) | |
222 | scm_misc_error ("st_seek", "negative offset", SCM_EOL); | |
223 | ||
224 | if (target >= pt->write_buf_size) | |
3fe6190f | 225 | { |
206d3de3 | 226 | if (!(SCM_CELL_WORD_0 (port) & SCM_WRTNG)) |
3fe6190f | 227 | { |
7dcb364d GH |
228 | if (target > pt->write_buf_size) |
229 | { | |
230 | scm_misc_error ("st_seek", | |
231 | "seek past end of read-only strport", | |
232 | SCM_EOL); | |
233 | } | |
234 | } | |
235 | else | |
236 | { | |
237 | st_resize_port (pt, target + (target == pt->write_buf_size | |
238 | ? SCM_WRITE_BLOCK | |
239 | : 0)); | |
3fe6190f GH |
240 | } |
241 | } | |
7dcb364d GH |
242 | pt->read_pos = pt->write_pos = pt->read_buf + target; |
243 | if (pt->read_pos > pt->read_end) | |
3fe6190f | 244 | { |
7dcb364d GH |
245 | pt->read_end = (unsigned char *) pt->read_pos; |
246 | pt->read_buf_size = pt->read_end - pt->read_buf; | |
3fe6190f | 247 | } |
ee149d03 | 248 | } |
754c9491 JB |
249 | return target; |
250 | } | |
251 | ||
252 | static void | |
affc96b5 | 253 | st_truncate (SCM port, off_t length) |
754c9491 JB |
254 | { |
255 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
3fe6190f GH |
256 | |
257 | if (length > pt->write_buf_size) | |
258 | st_resize_port (pt, length); | |
259 | ||
260 | pt->read_buf_size = length; | |
261 | pt->read_end = pt->read_buf + length; | |
262 | if (pt->read_pos > pt->read_end) | |
263 | pt->read_pos = pt->read_end; | |
754c9491 | 264 | |
3fe6190f GH |
265 | if (pt->write_pos > pt->read_end) |
266 | pt->write_pos = pt->read_end; | |
0f2d19dd JB |
267 | } |
268 | ||
0f2d19dd | 269 | SCM |
1bbd0b84 | 270 | scm_mkstrport (SCM pos, SCM str, long modes, const char *caller) |
0f2d19dd JB |
271 | { |
272 | SCM z; | |
754c9491 JB |
273 | scm_port *pt; |
274 | int str_len; | |
275 | ||
276 | SCM_ASSERT (SCM_INUMP(pos) && SCM_INUM(pos) >= 0, pos, SCM_ARG1, caller); | |
a6d9e5ab DH |
277 | SCM_ASSERT (SCM_STRINGP (str), str, SCM_ARG1, caller); |
278 | str_len = SCM_STRING_LENGTH (str); | |
754c9491 JB |
279 | if (SCM_INUM (pos) > str_len) |
280 | scm_out_of_range (caller, pos); | |
281 | if (!((modes & SCM_WRTNG) || (modes & SCM_RDNG))) | |
282 | scm_misc_error ("scm_mkstrport", "port must read or write", SCM_EOL); | |
0f2d19dd JB |
283 | SCM_NEWCELL (z); |
284 | SCM_DEFER_INTS; | |
285 | pt = scm_add_to_port_table (z); | |
54778cd3 | 286 | SCM_SET_CELL_TYPE (z, scm_tc16_strport | modes); |
0f2d19dd | 287 | SCM_SETPTAB_ENTRY (z, pt); |
74a16888 | 288 | SCM_SETSTREAM (z, SCM_UNPACK (str)); |
34f0f2b8 | 289 | pt->write_buf = pt->read_buf = SCM_STRING_UCHARS (str); |
754c9491 JB |
290 | pt->read_pos = pt->write_pos = pt->read_buf + SCM_INUM (pos); |
291 | pt->write_buf_size = pt->read_buf_size = str_len; | |
292 | pt->write_end = pt->read_end = pt->read_buf + pt->read_buf_size; | |
3fe6190f | 293 | |
0de97b83 | 294 | pt->rw_random = 1; |
3fe6190f | 295 | |
0f2d19dd | 296 | SCM_ALLOW_INTS; |
3fe6190f GH |
297 | |
298 | /* ensure write_pos is writable. */ | |
754c9491 JB |
299 | if ((modes & SCM_WRTNG) && pt->write_pos == pt->write_end) |
300 | st_flush (z); | |
0f2d19dd JB |
301 | return z; |
302 | } | |
303 | ||
3fe6190f GH |
304 | /* create a new string from a string port's buffer. */ |
305 | SCM scm_strport_to_string (SCM port) | |
306 | { | |
307 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
308 | ||
309 | if (pt->rw_active == SCM_PORT_WRITE) | |
310 | st_flush (port); | |
a4c7145b | 311 | return scm_makfromstr ((char *) pt->read_buf, pt->read_buf_size, 0); |
3fe6190f GH |
312 | } |
313 | ||
1f3908c4 KN |
314 | SCM_DEFINE (scm_object_to_string, "object->string", 1, 0, 0, |
315 | (SCM obj), | |
316 | "Return a Scheme string obtained by printing a given object.") | |
317 | #define FUNC_NAME s_scm_object_to_string | |
318 | { | |
319 | SCM str; | |
320 | SCM port; | |
321 | ||
322 | str = scm_makstr (0, 0); | |
1a92274c | 323 | port = scm_mkstrport (SCM_INUM0, str, SCM_OPN | SCM_WRTNG, FUNC_NAME); |
1f3908c4 KN |
324 | scm_prin1 (obj, port, 1); |
325 | return scm_strport_to_string (port); | |
326 | } | |
327 | #undef FUNC_NAME | |
328 | ||
329 | #if (SCM_DEBUG_DEPRECATED == 0) | |
330 | ||
331 | SCM | |
332 | scm_strprint_obj (SCM obj) | |
333 | { | |
334 | return scm_object_to_string (obj); | |
335 | } | |
336 | ||
337 | #endif /* (SCM_DEBUG_DEPRECATED == 0) */ | |
338 | ||
3b3b36dd | 339 | SCM_DEFINE (scm_call_with_output_string, "call-with-output-string", 1, 0, 0, |
1bbd0b84 | 340 | (SCM proc), |
b380b885 MD |
341 | "Calls the one-argument procedure @var{proc} with a newly created output\n" |
342 | "port. When the function returns, the string composed of the characters\n" | |
343 | "written into the port is returned.") | |
1bbd0b84 | 344 | #define FUNC_NAME s_scm_call_with_output_string |
0f2d19dd JB |
345 | { |
346 | SCM p; | |
754c9491 JB |
347 | |
348 | p = scm_mkstrport (SCM_INUM0, | |
349 | scm_make_string (SCM_INUM0, SCM_UNDEFINED), | |
350 | SCM_OPN | SCM_WRTNG, | |
1bbd0b84 | 351 | FUNC_NAME); |
0f2d19dd | 352 | scm_apply (proc, p, scm_listofnull); |
3fe6190f GH |
353 | |
354 | return scm_strport_to_string (p); | |
0f2d19dd | 355 | } |
1bbd0b84 | 356 | #undef FUNC_NAME |
0f2d19dd | 357 | |
3b3b36dd | 358 | SCM_DEFINE (scm_call_with_input_string, "call-with-input-string", 2, 0, 0, |
1bbd0b84 | 359 | (SCM str, SCM proc), |
b380b885 MD |
360 | "Calls the one-argument procedure @var{proc} with a newly created input\n" |
361 | "port from which @var{string}'s contents may be read. The value yielded\n" | |
362 | "by the @var{proc} is returned.") | |
1bbd0b84 | 363 | #define FUNC_NAME s_scm_call_with_input_string |
0f2d19dd | 364 | { |
1bbd0b84 | 365 | SCM p = scm_mkstrport(SCM_INUM0, str, SCM_OPN | SCM_RDNG, FUNC_NAME); |
0f2d19dd JB |
366 | return scm_apply (proc, p, scm_listofnull); |
367 | } | |
1bbd0b84 | 368 | #undef FUNC_NAME |
0f2d19dd | 369 | |
1cc91f1b | 370 | |
cd07a097 | 371 | |
a8aa30d8 MD |
372 | /* Given a null-terminated string EXPR containing a Scheme expression |
373 | read it, and return it as an SCM value. */ | |
374 | SCM | |
1bbd0b84 | 375 | scm_read_0str (char *expr) |
a8aa30d8 | 376 | { |
3fe6190f | 377 | SCM port = scm_mkstrport (SCM_INUM0, |
a8aa30d8 MD |
378 | scm_makfrom0str (expr), |
379 | SCM_OPN | SCM_RDNG, | |
380 | "scm_eval_0str"); | |
381 | SCM form; | |
382 | ||
383 | /* Read expressions from that port; ignore the values. */ | |
deca31e1 | 384 | form = scm_read (port); |
a8aa30d8 MD |
385 | |
386 | scm_close_port (port); | |
387 | return form; | |
388 | } | |
389 | ||
cd07a097 | 390 | /* Given a null-terminated string EXPR containing Scheme program text, |
a8aa30d8 MD |
391 | evaluate it, and return the result of the last expression evaluated. */ |
392 | SCM | |
6e706938 | 393 | scm_eval_0str (const char *expr) |
cd07a097 | 394 | { |
b377f53e JB |
395 | return scm_eval_string (scm_makfrom0str (expr)); |
396 | } | |
397 | ||
398 | ||
a1ec6916 | 399 | SCM_DEFINE (scm_eval_string, "eval-string", 1, 0, 0, |
1bbd0b84 | 400 | (SCM string), |
942e5b91 MG |
401 | "Evaluate @var{string} as the text representation of a Scheme\n" |
402 | "form or forms, and return whatever value they produce.\n" | |
403 | "Evaluation takes place in the environment returned by the\n" | |
404 | "procedure @code{interaction-environment}.") | |
1bbd0b84 | 405 | #define FUNC_NAME s_scm_eval_string |
b377f53e | 406 | { |
3fe6190f | 407 | SCM port = scm_mkstrport (SCM_INUM0, string, SCM_OPN | SCM_RDNG, |
cd07a097 JB |
408 | "scm_eval_0str"); |
409 | SCM form; | |
b377f53e | 410 | SCM ans = SCM_UNSPECIFIED; |
07bcf91d | 411 | SCM module = scm_interaction_environment (); |
cd07a097 JB |
412 | |
413 | /* Read expressions from that port; ignore the values. */ | |
0c32d76c | 414 | while (!SCM_EOF_OBJECT_P (form = scm_read (port))) |
07bcf91d | 415 | ans = scm_eval_x (form, module); |
cd07a097 | 416 | |
0d7368d7 JB |
417 | /* Don't close the port here; if we re-enter this function via a |
418 | continuation, then the next time we enter it, we'll get an error. | |
419 | It's a string port anyway, so there's no advantage to closing it | |
420 | early. */ | |
421 | ||
a8aa30d8 | 422 | return ans; |
cd07a097 | 423 | } |
1bbd0b84 | 424 | #undef FUNC_NAME |
cd07a097 | 425 | |
a98bddfd | 426 | static scm_bits_t |
0b6881fa | 427 | scm_make_stptob () |
0f2d19dd | 428 | { |
a98bddfd DH |
429 | scm_bits_t tc = scm_make_port_type ("string", stfill_buffer, st_write); |
430 | ||
6c747373 | 431 | scm_set_port_mark (tc, scm_markstream); |
affc96b5 GH |
432 | scm_set_port_end_input (tc, st_end_input); |
433 | scm_set_port_flush (tc, st_flush); | |
6c747373 | 434 | scm_set_port_seek (tc, st_seek); |
affc96b5 | 435 | scm_set_port_truncate (tc, st_truncate); |
a98bddfd DH |
436 | |
437 | return tc; | |
0f2d19dd JB |
438 | } |
439 | ||
0f2d19dd JB |
440 | void |
441 | scm_init_strports () | |
0f2d19dd | 442 | { |
a98bddfd DH |
443 | scm_tc16_strport = scm_make_stptob (); |
444 | ||
8dc9439f | 445 | #ifndef SCM_MAGIC_SNARFER |
a0599745 | 446 | #include "libguile/strports.x" |
8dc9439f | 447 | #endif |
0f2d19dd JB |
448 | } |
449 | ||
89e00824 ML |
450 | |
451 | /* | |
452 | Local Variables: | |
453 | c-file-style: "gnu" | |
454 | End: | |
455 | */ |