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bf5ad0da | 1 | /* Copyright (C) 1995,1996,1998,1999,2000,2001,2002, 2003, 2005 Free Software Foundation, Inc. |
0f2d19dd | 2 | * |
73be1d9e MV |
3 | * This library is free software; you can redistribute it and/or |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
0f2d19dd | 7 | * |
73be1d9e MV |
8 | * This library 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 GNU | |
11 | * Lesser General Public License for more details. | |
0f2d19dd | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
92205699 | 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
73be1d9e | 16 | */ |
1bbd0b84 | 17 | |
1bbd0b84 | 18 | |
0f2d19dd JB |
19 | \f |
20 | ||
c986274f RB |
21 | #if HAVE_CONFIG_H |
22 | # include <config.h> | |
23 | #endif | |
24 | ||
a0599745 | 25 | #include "libguile/_scm.h" |
681b9005 MD |
26 | |
27 | #include <stdio.h> | |
28 | #ifdef HAVE_UNISTD_H | |
29 | #include <unistd.h> | |
30 | #endif | |
31 | ||
a0599745 MD |
32 | #include "libguile/unif.h" |
33 | #include "libguile/eval.h" | |
34 | #include "libguile/ports.h" | |
35 | #include "libguile/read.h" | |
36 | #include "libguile/root.h" | |
37 | #include "libguile/strings.h" | |
07bcf91d | 38 | #include "libguile/modules.h" |
fe78b6c0 | 39 | #include "libguile/validate.h" |
ca13a04a | 40 | #include "libguile/deprecation.h" |
20e6290e | 41 | |
a0599745 | 42 | #include "libguile/strports.h" |
0f2d19dd | 43 | |
95b88819 GH |
44 | #ifdef HAVE_STRING_H |
45 | #include <string.h> | |
46 | #endif | |
47 | ||
0f2d19dd JB |
48 | \f |
49 | ||
50 | /* {Ports - string ports} | |
51 | * | |
52 | */ | |
53 | ||
3fe6190f | 54 | /* NOTES: |
cc95e00a MV |
55 | |
56 | We break the rules set forth by strings.h about accessing the | |
57 | internals of strings here. We can do this since we can guarantee | |
58 | that the string used as pt->stream is not in use by anyone else. | |
59 | Thus, it's representation will not change asynchronously. | |
60 | ||
61 | (Ports aren't thread-safe yet anyway...) | |
62 | ||
3fe6190f GH |
63 | write_buf/write_end point to the ends of the allocated string. |
64 | read_buf/read_end in principle point to the part of the string which | |
65 | has been written to, but this is only updated after a flush. | |
66 | read_pos and write_pos in principle should be equal, but this is only true | |
61e452ba | 67 | when rw_active is SCM_PORT_NEITHER. |
bf5ad0da KR |
68 | |
69 | ENHANCE-ME - output blocks: | |
70 | ||
71 | The current code keeps an output string as a single block. That means | |
72 | when the size is increased the entire old contents must be copied. It'd | |
73 | be more efficient to begin a new block when the old one is full, so | |
74 | there's no re-copying of previous data. | |
75 | ||
76 | To make seeking efficient, keeping the pieces in a vector might be best, | |
77 | though appending is probably the most common operation. The size of each | |
78 | block could be progressively increased, so the bigger the string the | |
79 | bigger the blocks. | |
80 | ||
81 | When `get-output-string' is called the blocks have to be coalesced into a | |
82 | string, the result could be kept as a single big block. If blocks were | |
83 | strings then `get-output-string' could notice when there's just one and | |
84 | return that with a copy-on-write (though repeated calls to | |
85 | `get-output-string' are probably unlikely). | |
86 | ||
87 | Another possibility would be to extend the port mechanism to let SCM | |
88 | strings come through directly from `display' and friends. That way if a | |
89 | big string is written it can be kept as a copy-on-write, saving time | |
90 | copying and maybe saving some space. */ | |
91 | ||
1cc91f1b | 92 | |
92c2555f | 93 | scm_t_bits scm_tc16_strport; |
a98bddfd DH |
94 | |
95 | ||
ee149d03 JB |
96 | static int |
97 | stfill_buffer (SCM port) | |
0f2d19dd | 98 | { |
92c2555f | 99 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
ee149d03 | 100 | |
ee149d03 JB |
101 | if (pt->read_pos >= pt->read_end) |
102 | return EOF; | |
103 | else | |
41b0806d | 104 | return scm_return_first_int (*pt->read_pos, port); |
0f2d19dd JB |
105 | } |
106 | ||
3fe6190f GH |
107 | /* change the size of a port's string to new_size. this doesn't |
108 | change read_buf_size. */ | |
754c9491 | 109 | static void |
92c2555f | 110 | st_resize_port (scm_t_port *pt, off_t new_size) |
754c9491 | 111 | { |
94115ae3 | 112 | SCM old_stream = SCM_PACK (pt->stream); |
cc95e00a MV |
113 | const char *src = scm_i_string_chars (old_stream); |
114 | char *dst; | |
115 | SCM new_stream = scm_i_make_string (new_size, &dst); | |
116 | unsigned long int old_size = scm_i_string_length (old_stream); | |
c014a02e ML |
117 | unsigned long int min_size = min (old_size, new_size); |
118 | unsigned long int i; | |
74a16888 | 119 | |
3fe6190f GH |
120 | off_t index = pt->write_pos - pt->write_buf; |
121 | ||
122 | pt->write_buf_size = new_size; | |
123 | ||
94115ae3 | 124 | for (i = 0; i != min_size; ++i) |
cc95e00a | 125 | dst[i] = src[i]; |
8824ac88 MV |
126 | |
127 | scm_remember_upto_here_1 (old_stream); | |
754c9491 | 128 | |
94115ae3 | 129 | /* reset buffer. */ |
754c9491 | 130 | { |
729dbac3 | 131 | pt->stream = SCM_UNPACK (new_stream); |
5a6d139b | 132 | pt->read_buf = pt->write_buf = (unsigned char *)dst; |
3fe6190f GH |
133 | pt->read_pos = pt->write_pos = pt->write_buf + index; |
134 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
135 | pt->read_end = pt->read_buf + pt->read_buf_size; | |
754c9491 JB |
136 | } |
137 | } | |
138 | ||
3fe6190f GH |
139 | /* amount by which write_buf is expanded. */ |
140 | #define SCM_WRITE_BLOCK 80 | |
141 | ||
142 | /* ensure that write_pos < write_end by enlarging the buffer when | |
bf5ad0da KR |
143 | necessary. update read_buf to account for written chars. |
144 | ||
145 | The buffer is enlarged by 1.5 times, plus SCM_WRITE_BLOCK. Adding just a | |
146 | fixed amount is no good, because there's a block copy for each increment, | |
147 | and that copying would take quadratic time. In the past it was found to | |
148 | be very slow just adding 80 bytes each time (eg. about 10 seconds for | |
149 | writing a 100kbyte string). */ | |
150 | ||
ee149d03 JB |
151 | static void |
152 | st_flush (SCM port) | |
0f2d19dd | 153 | { |
92c2555f | 154 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
ee149d03 JB |
155 | |
156 | if (pt->write_pos == pt->write_end) | |
157 | { | |
bf5ad0da | 158 | st_resize_port (pt, pt->write_buf_size * 3 / 2 + SCM_WRITE_BLOCK); |
754c9491 JB |
159 | } |
160 | pt->read_pos = pt->write_pos; | |
3fe6190f GH |
161 | if (pt->read_pos > pt->read_end) |
162 | { | |
163 | pt->read_end = (unsigned char *) pt->read_pos; | |
164 | pt->read_buf_size = pt->read_end - pt->read_buf; | |
165 | } | |
61e452ba | 166 | pt->rw_active = SCM_PORT_NEITHER; |
754c9491 JB |
167 | } |
168 | ||
31703ab8 | 169 | static void |
8aa011a1 | 170 | st_write (SCM port, const void *data, size_t size) |
31703ab8 | 171 | { |
92c2555f | 172 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
31703ab8 GH |
173 | const char *input = (char *) data; |
174 | ||
175 | while (size > 0) | |
176 | { | |
177 | int space = pt->write_end - pt->write_pos; | |
178 | int write_len = (size > space) ? space : size; | |
179 | ||
4b8ec619 | 180 | memcpy ((char *) pt->write_pos, input, write_len); |
31703ab8 GH |
181 | pt->write_pos += write_len; |
182 | size -= write_len; | |
183 | input += write_len; | |
184 | if (write_len == space) | |
185 | st_flush (port); | |
186 | } | |
187 | } | |
188 | ||
754c9491 | 189 | static void |
affc96b5 | 190 | st_end_input (SCM port, int offset) |
754c9491 | 191 | { |
92c2555f | 192 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
7dcb364d | 193 | |
cd19d608 GH |
194 | if (pt->read_pos - pt->read_buf < offset) |
195 | scm_misc_error ("st_end_input", "negative position", SCM_EOL); | |
196 | ||
a3c8b9fc | 197 | pt->write_pos = (unsigned char *) (pt->read_pos = pt->read_pos - offset); |
61e452ba | 198 | pt->rw_active = SCM_PORT_NEITHER; |
754c9491 JB |
199 | } |
200 | ||
201 | static off_t | |
202 | st_seek (SCM port, off_t offset, int whence) | |
203 | { | |
92c2555f | 204 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
754c9491 JB |
205 | off_t target; |
206 | ||
7dcb364d GH |
207 | if (pt->rw_active == SCM_PORT_READ && offset == 0 && whence == SEEK_CUR) |
208 | /* special case to avoid disturbing the unread-char buffer. */ | |
754c9491 | 209 | { |
7dcb364d GH |
210 | if (pt->read_buf == pt->putback_buf) |
211 | { | |
212 | target = pt->saved_read_pos - pt->saved_read_buf | |
213 | - (pt->read_end - pt->read_pos); | |
214 | } | |
215 | else | |
216 | { | |
217 | target = pt->read_pos - pt->read_buf; | |
218 | } | |
754c9491 | 219 | } |
7dcb364d GH |
220 | else |
221 | /* all other cases. */ | |
754c9491 | 222 | { |
7dcb364d GH |
223 | if (pt->rw_active == SCM_PORT_WRITE) |
224 | st_flush (port); | |
225 | ||
226 | if (pt->rw_active == SCM_PORT_READ) | |
227 | scm_end_input (port); | |
228 | ||
229 | switch (whence) | |
230 | { | |
231 | case SEEK_CUR: | |
232 | target = pt->read_pos - pt->read_buf + offset; | |
233 | break; | |
234 | case SEEK_END: | |
235 | target = pt->read_end - pt->read_buf + offset; | |
236 | break; | |
237 | default: /* SEEK_SET */ | |
238 | target = offset; | |
239 | break; | |
240 | } | |
241 | ||
242 | if (target < 0) | |
243 | scm_misc_error ("st_seek", "negative offset", SCM_EOL); | |
244 | ||
245 | if (target >= pt->write_buf_size) | |
3fe6190f | 246 | { |
206d3de3 | 247 | if (!(SCM_CELL_WORD_0 (port) & SCM_WRTNG)) |
3fe6190f | 248 | { |
7dcb364d GH |
249 | if (target > pt->write_buf_size) |
250 | { | |
251 | scm_misc_error ("st_seek", | |
252 | "seek past end of read-only strport", | |
253 | SCM_EOL); | |
254 | } | |
255 | } | |
256 | else | |
257 | { | |
258 | st_resize_port (pt, target + (target == pt->write_buf_size | |
259 | ? SCM_WRITE_BLOCK | |
260 | : 0)); | |
3fe6190f GH |
261 | } |
262 | } | |
7dcb364d GH |
263 | pt->read_pos = pt->write_pos = pt->read_buf + target; |
264 | if (pt->read_pos > pt->read_end) | |
3fe6190f | 265 | { |
7dcb364d GH |
266 | pt->read_end = (unsigned char *) pt->read_pos; |
267 | pt->read_buf_size = pt->read_end - pt->read_buf; | |
3fe6190f | 268 | } |
ee149d03 | 269 | } |
754c9491 JB |
270 | return target; |
271 | } | |
272 | ||
273 | static void | |
affc96b5 | 274 | st_truncate (SCM port, off_t length) |
754c9491 | 275 | { |
92c2555f | 276 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
3fe6190f GH |
277 | |
278 | if (length > pt->write_buf_size) | |
279 | st_resize_port (pt, length); | |
280 | ||
281 | pt->read_buf_size = length; | |
282 | pt->read_end = pt->read_buf + length; | |
283 | if (pt->read_pos > pt->read_end) | |
284 | pt->read_pos = pt->read_end; | |
754c9491 | 285 | |
3fe6190f GH |
286 | if (pt->write_pos > pt->read_end) |
287 | pt->write_pos = pt->read_end; | |
0f2d19dd JB |
288 | } |
289 | ||
0f2d19dd | 290 | SCM |
1bbd0b84 | 291 | scm_mkstrport (SCM pos, SCM str, long modes, const char *caller) |
0f2d19dd JB |
292 | { |
293 | SCM z; | |
92c2555f | 294 | scm_t_port *pt; |
e11e83f3 | 295 | size_t str_len, c_pos; |
754c9491 | 296 | |
cc95e00a MV |
297 | SCM_ASSERT (scm_is_string (str), str, SCM_ARG1, caller); |
298 | ||
299 | str_len = scm_i_string_length (str); | |
e11e83f3 MV |
300 | c_pos = scm_to_unsigned_integer (pos, 0, str_len); |
301 | ||
754c9491 JB |
302 | if (!((modes & SCM_WRTNG) || (modes & SCM_RDNG))) |
303 | scm_misc_error ("scm_mkstrport", "port must read or write", SCM_EOL); | |
5f16b897 | 304 | |
cc95e00a MV |
305 | /* XXX |
306 | ||
307 | Make a new string to isolate us from changes to the original. | |
308 | This is done so that we can rely on scm_i_string_chars to stay in | |
309 | place even across SCM_TICKs. | |
310 | ||
311 | Additionally, when we are going to write to the string, we make a | |
312 | copy so that we can write to it without having to use | |
313 | scm_i_string_writable_chars. | |
314 | */ | |
315 | ||
316 | if (modes & SCM_WRTNG) | |
317 | str = scm_c_substring_copy (str, 0, str_len); | |
318 | else | |
319 | str = scm_c_substring (str, 0, str_len); | |
320 | ||
9de87eea | 321 | scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex); |
da220f27 HWN |
322 | z = scm_new_port_table_entry (scm_tc16_strport); |
323 | pt = SCM_PTAB_ENTRY(z); | |
74a16888 | 324 | SCM_SETSTREAM (z, SCM_UNPACK (str)); |
da220f27 | 325 | SCM_SET_CELL_TYPE(z, scm_tc16_strport|modes); |
cc95e00a | 326 | /* see above why we can use scm_i_string_chars here. */ |
5a6d139b | 327 | pt->write_buf = pt->read_buf = (unsigned char *) scm_i_string_chars (str); |
e11e83f3 | 328 | pt->read_pos = pt->write_pos = pt->read_buf + c_pos; |
754c9491 JB |
329 | pt->write_buf_size = pt->read_buf_size = str_len; |
330 | pt->write_end = pt->read_end = pt->read_buf + pt->read_buf_size; | |
3fe6190f | 331 | |
0de97b83 | 332 | pt->rw_random = 1; |
3fe6190f | 333 | |
9de87eea | 334 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
3fe6190f GH |
335 | |
336 | /* ensure write_pos is writable. */ | |
754c9491 JB |
337 | if ((modes & SCM_WRTNG) && pt->write_pos == pt->write_end) |
338 | st_flush (z); | |
0f2d19dd JB |
339 | return z; |
340 | } | |
341 | ||
3fe6190f GH |
342 | /* create a new string from a string port's buffer. */ |
343 | SCM scm_strport_to_string (SCM port) | |
344 | { | |
92c2555f | 345 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
36284627 | 346 | SCM str; |
cc95e00a MV |
347 | char *dst; |
348 | ||
3fe6190f GH |
349 | if (pt->rw_active == SCM_PORT_WRITE) |
350 | st_flush (port); | |
36284627 | 351 | |
cc95e00a MV |
352 | str = scm_i_make_string (pt->read_buf_size, &dst); |
353 | memcpy (dst, (char *) pt->read_buf, pt->read_buf_size); | |
36284627 DH |
354 | scm_remember_upto_here_1 (port); |
355 | return str; | |
3fe6190f GH |
356 | } |
357 | ||
fe78b6c0 KN |
358 | SCM_DEFINE (scm_object_to_string, "object->string", 1, 1, 0, |
359 | (SCM obj, SCM printer), | |
360 | "Return a Scheme string obtained by printing @var{obj}.\n" | |
361 | "Printing function can be specified by the optional second\n" | |
362 | "argument @var{printer} (default: @code{write}).") | |
1f3908c4 KN |
363 | #define FUNC_NAME s_scm_object_to_string |
364 | { | |
fe78b6c0 KN |
365 | SCM str, port; |
366 | ||
367 | if (!SCM_UNBNDP (printer)) | |
368 | SCM_VALIDATE_PROC (2, printer); | |
1f3908c4 | 369 | |
cc95e00a | 370 | str = scm_c_make_string (0, SCM_UNDEFINED); |
1a92274c | 371 | port = scm_mkstrport (SCM_INUM0, str, SCM_OPN | SCM_WRTNG, FUNC_NAME); |
fe78b6c0 KN |
372 | |
373 | if (SCM_UNBNDP (printer)) | |
374 | scm_write (obj, port); | |
375 | else | |
fdc28395 | 376 | scm_call_2 (printer, obj, port); |
fe78b6c0 | 377 | |
1f3908c4 KN |
378 | return scm_strport_to_string (port); |
379 | } | |
380 | #undef FUNC_NAME | |
381 | ||
3b3b36dd | 382 | SCM_DEFINE (scm_call_with_output_string, "call-with-output-string", 1, 0, 0, |
1bbd0b84 | 383 | (SCM proc), |
b380b885 MD |
384 | "Calls the one-argument procedure @var{proc} with a newly created output\n" |
385 | "port. When the function returns, the string composed of the characters\n" | |
386 | "written into the port is returned.") | |
1bbd0b84 | 387 | #define FUNC_NAME s_scm_call_with_output_string |
0f2d19dd JB |
388 | { |
389 | SCM p; | |
754c9491 JB |
390 | |
391 | p = scm_mkstrport (SCM_INUM0, | |
392 | scm_make_string (SCM_INUM0, SCM_UNDEFINED), | |
393 | SCM_OPN | SCM_WRTNG, | |
1bbd0b84 | 394 | FUNC_NAME); |
fdc28395 | 395 | scm_call_1 (proc, p); |
3fe6190f | 396 | |
184b85a3 | 397 | return scm_get_output_string (p); |
0f2d19dd | 398 | } |
1bbd0b84 | 399 | #undef FUNC_NAME |
0f2d19dd | 400 | |
3b3b36dd | 401 | SCM_DEFINE (scm_call_with_input_string, "call-with-input-string", 2, 0, 0, |
1e6808ea MG |
402 | (SCM string, SCM proc), |
403 | "Calls the one-argument procedure @var{proc} with a newly\n" | |
404 | "created input port from which @var{string}'s contents may be\n" | |
405 | "read. The value yielded by the @var{proc} is returned.") | |
1bbd0b84 | 406 | #define FUNC_NAME s_scm_call_with_input_string |
0f2d19dd | 407 | { |
1e6808ea | 408 | SCM p = scm_mkstrport(SCM_INUM0, string, SCM_OPN | SCM_RDNG, FUNC_NAME); |
fdc28395 | 409 | return scm_call_1 (proc, p); |
0f2d19dd | 410 | } |
1bbd0b84 | 411 | #undef FUNC_NAME |
0f2d19dd | 412 | |
e87a03fc MG |
413 | SCM_DEFINE (scm_open_input_string, "open-input-string", 1, 0, 0, |
414 | (SCM str), | |
1e6808ea MG |
415 | "Take a string and return an input port that delivers characters\n" |
416 | "from the string. The port can be closed by\n" | |
e87a03fc MG |
417 | "@code{close-input-port}, though its storage will be reclaimed\n" |
418 | "by the garbage collector if it becomes inaccessible.") | |
419 | #define FUNC_NAME s_scm_open_input_string | |
420 | { | |
421 | SCM p = scm_mkstrport(SCM_INUM0, str, SCM_OPN | SCM_RDNG, FUNC_NAME); | |
422 | return p; | |
423 | } | |
424 | #undef FUNC_NAME | |
425 | ||
426 | SCM_DEFINE (scm_open_output_string, "open-output-string", 0, 0, 0, | |
427 | (void), | |
1e6808ea | 428 | "Return an output port that will accumulate characters for\n" |
e87a03fc MG |
429 | "retrieval by @code{get-output-string}. The port can be closed\n" |
430 | "by the procedure @code{close-output-port}, though its storage\n" | |
431 | "will be reclaimed by the garbage collector if it becomes\n" | |
432 | "inaccessible.") | |
433 | #define FUNC_NAME s_scm_open_output_string | |
434 | { | |
435 | SCM p; | |
436 | ||
437 | p = scm_mkstrport (SCM_INUM0, | |
438 | scm_make_string (SCM_INUM0, SCM_UNDEFINED), | |
439 | SCM_OPN | SCM_WRTNG, | |
440 | FUNC_NAME); | |
441 | return p; | |
442 | } | |
443 | #undef FUNC_NAME | |
444 | ||
445 | SCM_DEFINE (scm_get_output_string, "get-output-string", 1, 0, 0, | |
446 | (SCM port), | |
447 | "Given an output port created by @code{open-output-string},\n" | |
1e6808ea | 448 | "return a string consisting of the characters that have been\n" |
e87a03fc MG |
449 | "output to the port so far.") |
450 | #define FUNC_NAME s_scm_get_output_string | |
451 | { | |
452 | SCM_VALIDATE_OPOUTSTRPORT (1, port); | |
453 | return scm_strport_to_string (port); | |
454 | } | |
455 | #undef FUNC_NAME | |
1cc91f1b | 456 | |
cd07a097 | 457 | |
a8aa30d8 MD |
458 | /* Given a null-terminated string EXPR containing a Scheme expression |
459 | read it, and return it as an SCM value. */ | |
460 | SCM | |
ca13a04a | 461 | scm_c_read_string (const char *expr) |
a8aa30d8 | 462 | { |
3fe6190f | 463 | SCM port = scm_mkstrport (SCM_INUM0, |
cc95e00a | 464 | scm_from_locale_string (expr), |
a8aa30d8 | 465 | SCM_OPN | SCM_RDNG, |
ca13a04a | 466 | "scm_c_read_string"); |
a8aa30d8 MD |
467 | SCM form; |
468 | ||
469 | /* Read expressions from that port; ignore the values. */ | |
deca31e1 | 470 | form = scm_read (port); |
a8aa30d8 MD |
471 | |
472 | scm_close_port (port); | |
473 | return form; | |
474 | } | |
475 | ||
cd07a097 | 476 | /* Given a null-terminated string EXPR containing Scheme program text, |
a8aa30d8 MD |
477 | evaluate it, and return the result of the last expression evaluated. */ |
478 | SCM | |
ca13a04a | 479 | scm_c_eval_string (const char *expr) |
cd07a097 | 480 | { |
cc95e00a | 481 | return scm_eval_string (scm_from_locale_string (expr)); |
b377f53e JB |
482 | } |
483 | ||
209b52fe MV |
484 | SCM |
485 | scm_c_eval_string_in_module (const char *expr, SCM module) | |
486 | { | |
cc95e00a | 487 | return scm_eval_string_in_module (scm_from_locale_string (expr), module); |
209b52fe MV |
488 | } |
489 | ||
490 | ||
96e83482 MV |
491 | static SCM |
492 | inner_eval_string (void *data) | |
b377f53e | 493 | { |
96e83482 | 494 | SCM port = (SCM)data; |
cd07a097 | 495 | SCM form; |
b377f53e | 496 | SCM ans = SCM_UNSPECIFIED; |
cd07a097 JB |
497 | |
498 | /* Read expressions from that port; ignore the values. */ | |
0c32d76c | 499 | while (!SCM_EOF_OBJECT_P (form = scm_read (port))) |
96e83482 | 500 | ans = scm_primitive_eval_x (form); |
cd07a097 | 501 | |
0d7368d7 JB |
502 | /* Don't close the port here; if we re-enter this function via a |
503 | continuation, then the next time we enter it, we'll get an error. | |
504 | It's a string port anyway, so there's no advantage to closing it | |
505 | early. */ | |
506 | ||
a8aa30d8 | 507 | return ans; |
cd07a097 | 508 | } |
96e83482 | 509 | |
209b52fe MV |
510 | SCM_DEFINE (scm_eval_string_in_module, "eval-string", 1, 1, 0, |
511 | (SCM string, SCM module), | |
96e83482 MV |
512 | "Evaluate @var{string} as the text representation of a Scheme\n" |
513 | "form or forms, and return whatever value they produce.\n" | |
209b52fe MV |
514 | "Evaluation takes place in the given module, or the current\n" |
515 | "module when no module is given.\n" | |
516 | "While the code is evaluated, the given module is made the\n" | |
517 | "current one. The current module is restored when this\n" | |
518 | "procedure returns.") | |
519 | #define FUNC_NAME s_scm_eval_string_in_module | |
96e83482 MV |
520 | { |
521 | SCM port = scm_mkstrport (SCM_INUM0, string, SCM_OPN | SCM_RDNG, | |
209b52fe MV |
522 | FUNC_NAME); |
523 | if (SCM_UNBNDP (module)) | |
524 | module = scm_current_module (); | |
aeec5be1 MV |
525 | else |
526 | SCM_VALIDATE_MODULE (2, module); | |
209b52fe | 527 | return scm_c_call_with_current_module (module, |
96e83482 MV |
528 | inner_eval_string, (void *)port); |
529 | } | |
1bbd0b84 | 530 | #undef FUNC_NAME |
cd07a097 | 531 | |
209b52fe MV |
532 | SCM |
533 | scm_eval_string (SCM string) | |
534 | { | |
535 | return scm_eval_string_in_module (string, SCM_UNDEFINED); | |
536 | } | |
537 | ||
92c2555f | 538 | static scm_t_bits |
0b6881fa | 539 | scm_make_stptob () |
0f2d19dd | 540 | { |
92c2555f | 541 | scm_t_bits tc = scm_make_port_type ("string", stfill_buffer, st_write); |
a98bddfd | 542 | |
6c747373 | 543 | scm_set_port_mark (tc, scm_markstream); |
affc96b5 GH |
544 | scm_set_port_end_input (tc, st_end_input); |
545 | scm_set_port_flush (tc, st_flush); | |
6c747373 | 546 | scm_set_port_seek (tc, st_seek); |
affc96b5 | 547 | scm_set_port_truncate (tc, st_truncate); |
a98bddfd DH |
548 | |
549 | return tc; | |
0f2d19dd JB |
550 | } |
551 | ||
0f2d19dd JB |
552 | void |
553 | scm_init_strports () | |
0f2d19dd | 554 | { |
a98bddfd DH |
555 | scm_tc16_strport = scm_make_stptob (); |
556 | ||
a0599745 | 557 | #include "libguile/strports.x" |
0f2d19dd JB |
558 | } |
559 | ||
89e00824 ML |
560 | |
561 | /* | |
562 | Local Variables: | |
563 | c-file-style: "gnu" | |
564 | End: | |
565 | */ |