Commit | Line | Data |
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7b041912 | 1 | /* Copyright (C) 1995,1996,1998,1999,2000,2001,2002, 2003, 2005, 2006, 2009, 2010 Free Software Foundation, Inc. |
0f2d19dd | 2 | * |
73be1d9e | 3 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
4 | * modify it under the terms of the GNU Lesser General Public License |
5 | * as published by the Free Software Foundation; either version 3 of | |
6 | * the License, or (at your option) any later version. | |
0f2d19dd | 7 | * |
53befeb7 NJ |
8 | * This library is distributed in the hope that it will be useful, but |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
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 | |
53befeb7 NJ |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
16 | * 02110-1301 USA | |
73be1d9e | 17 | */ |
1bbd0b84 | 18 | |
1bbd0b84 | 19 | |
0f2d19dd JB |
20 | \f |
21 | ||
dbb605f5 | 22 | #ifdef HAVE_CONFIG_H |
c986274f RB |
23 | # include <config.h> |
24 | #endif | |
25 | ||
a0599745 | 26 | #include "libguile/_scm.h" |
681b9005 MD |
27 | |
28 | #include <stdio.h> | |
29 | #ifdef HAVE_UNISTD_H | |
30 | #include <unistd.h> | |
31 | #endif | |
32 | ||
2fa901a5 | 33 | #include "libguile/arrays.h" |
a0599745 MD |
34 | #include "libguile/eval.h" |
35 | #include "libguile/ports.h" | |
36 | #include "libguile/read.h" | |
37 | #include "libguile/root.h" | |
38 | #include "libguile/strings.h" | |
07bcf91d | 39 | #include "libguile/modules.h" |
fe78b6c0 | 40 | #include "libguile/validate.h" |
ca13a04a | 41 | #include "libguile/deprecation.h" |
889975e5 | 42 | #include "libguile/srfi-4.h" |
20e6290e | 43 | |
a0599745 | 44 | #include "libguile/strports.h" |
0f2d19dd | 45 | |
95b88819 GH |
46 | #ifdef HAVE_STRING_H |
47 | #include <string.h> | |
48 | #endif | |
49 | ||
0f2d19dd JB |
50 | \f |
51 | ||
52 | /* {Ports - string ports} | |
53 | * | |
54 | */ | |
55 | ||
3fe6190f | 56 | /* NOTES: |
cc95e00a MV |
57 | |
58 | We break the rules set forth by strings.h about accessing the | |
59 | internals of strings here. We can do this since we can guarantee | |
60 | that the string used as pt->stream is not in use by anyone else. | |
61 | Thus, it's representation will not change asynchronously. | |
62 | ||
63 | (Ports aren't thread-safe yet anyway...) | |
64 | ||
3fe6190f GH |
65 | write_buf/write_end point to the ends of the allocated string. |
66 | read_buf/read_end in principle point to the part of the string which | |
67 | has been written to, but this is only updated after a flush. | |
68 | read_pos and write_pos in principle should be equal, but this is only true | |
61e452ba | 69 | when rw_active is SCM_PORT_NEITHER. |
bf5ad0da KR |
70 | |
71 | ENHANCE-ME - output blocks: | |
72 | ||
73 | The current code keeps an output string as a single block. That means | |
74 | when the size is increased the entire old contents must be copied. It'd | |
75 | be more efficient to begin a new block when the old one is full, so | |
76 | there's no re-copying of previous data. | |
77 | ||
78 | To make seeking efficient, keeping the pieces in a vector might be best, | |
79 | though appending is probably the most common operation. The size of each | |
80 | block could be progressively increased, so the bigger the string the | |
81 | bigger the blocks. | |
82 | ||
83 | When `get-output-string' is called the blocks have to be coalesced into a | |
84 | string, the result could be kept as a single big block. If blocks were | |
85 | strings then `get-output-string' could notice when there's just one and | |
86 | return that with a copy-on-write (though repeated calls to | |
87 | `get-output-string' are probably unlikely). | |
88 | ||
89 | Another possibility would be to extend the port mechanism to let SCM | |
90 | strings come through directly from `display' and friends. That way if a | |
91 | big string is written it can be kept as a copy-on-write, saving time | |
92 | copying and maybe saving some space. */ | |
93 | ||
1cc91f1b | 94 | |
92c2555f | 95 | scm_t_bits scm_tc16_strport; |
a98bddfd DH |
96 | |
97 | ||
ee149d03 JB |
98 | static int |
99 | stfill_buffer (SCM port) | |
0f2d19dd | 100 | { |
92c2555f | 101 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
ee149d03 | 102 | |
ee149d03 JB |
103 | if (pt->read_pos >= pt->read_end) |
104 | return EOF; | |
105 | else | |
41b0806d | 106 | return scm_return_first_int (*pt->read_pos, port); |
0f2d19dd JB |
107 | } |
108 | ||
3fe6190f GH |
109 | /* change the size of a port's string to new_size. this doesn't |
110 | change read_buf_size. */ | |
754c9491 | 111 | static void |
f1ce9199 | 112 | st_resize_port (scm_t_port *pt, scm_t_off new_size) |
754c9491 | 113 | { |
94115ae3 | 114 | SCM old_stream = SCM_PACK (pt->stream); |
cc95e00a MV |
115 | const char *src = scm_i_string_chars (old_stream); |
116 | char *dst; | |
117 | SCM new_stream = scm_i_make_string (new_size, &dst); | |
118 | unsigned long int old_size = scm_i_string_length (old_stream); | |
c014a02e ML |
119 | unsigned long int min_size = min (old_size, new_size); |
120 | unsigned long int i; | |
74a16888 | 121 | |
f1ce9199 | 122 | scm_t_off index = pt->write_pos - pt->write_buf; |
3fe6190f GH |
123 | |
124 | pt->write_buf_size = new_size; | |
125 | ||
94115ae3 | 126 | for (i = 0; i != min_size; ++i) |
cc95e00a | 127 | dst[i] = src[i]; |
8824ac88 MV |
128 | |
129 | scm_remember_upto_here_1 (old_stream); | |
754c9491 | 130 | |
94115ae3 | 131 | /* reset buffer. */ |
754c9491 | 132 | { |
729dbac3 | 133 | pt->stream = SCM_UNPACK (new_stream); |
5a6d139b | 134 | pt->read_buf = pt->write_buf = (unsigned char *)dst; |
3fe6190f GH |
135 | pt->read_pos = pt->write_pos = pt->write_buf + index; |
136 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
137 | pt->read_end = pt->read_buf + pt->read_buf_size; | |
754c9491 JB |
138 | } |
139 | } | |
140 | ||
3fe6190f GH |
141 | /* amount by which write_buf is expanded. */ |
142 | #define SCM_WRITE_BLOCK 80 | |
143 | ||
144 | /* ensure that write_pos < write_end by enlarging the buffer when | |
bf5ad0da KR |
145 | necessary. update read_buf to account for written chars. |
146 | ||
147 | The buffer is enlarged by 1.5 times, plus SCM_WRITE_BLOCK. Adding just a | |
148 | fixed amount is no good, because there's a block copy for each increment, | |
149 | and that copying would take quadratic time. In the past it was found to | |
150 | be very slow just adding 80 bytes each time (eg. about 10 seconds for | |
151 | writing a 100kbyte string). */ | |
152 | ||
ee149d03 JB |
153 | static void |
154 | st_flush (SCM port) | |
0f2d19dd | 155 | { |
92c2555f | 156 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
ee149d03 JB |
157 | |
158 | if (pt->write_pos == pt->write_end) | |
159 | { | |
bf5ad0da | 160 | st_resize_port (pt, pt->write_buf_size * 3 / 2 + SCM_WRITE_BLOCK); |
754c9491 JB |
161 | } |
162 | pt->read_pos = pt->write_pos; | |
3fe6190f GH |
163 | if (pt->read_pos > pt->read_end) |
164 | { | |
165 | pt->read_end = (unsigned char *) pt->read_pos; | |
166 | pt->read_buf_size = pt->read_end - pt->read_buf; | |
167 | } | |
61e452ba | 168 | pt->rw_active = SCM_PORT_NEITHER; |
754c9491 JB |
169 | } |
170 | ||
31703ab8 | 171 | static void |
8aa011a1 | 172 | st_write (SCM port, const void *data, size_t size) |
31703ab8 | 173 | { |
92c2555f | 174 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
31703ab8 GH |
175 | const char *input = (char *) data; |
176 | ||
177 | while (size > 0) | |
178 | { | |
179 | int space = pt->write_end - pt->write_pos; | |
180 | int write_len = (size > space) ? space : size; | |
181 | ||
4b8ec619 | 182 | memcpy ((char *) pt->write_pos, input, write_len); |
31703ab8 GH |
183 | pt->write_pos += write_len; |
184 | size -= write_len; | |
185 | input += write_len; | |
186 | if (write_len == space) | |
187 | st_flush (port); | |
188 | } | |
189 | } | |
190 | ||
754c9491 | 191 | static void |
affc96b5 | 192 | st_end_input (SCM port, int offset) |
754c9491 | 193 | { |
92c2555f | 194 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
7dcb364d | 195 | |
cd19d608 GH |
196 | if (pt->read_pos - pt->read_buf < offset) |
197 | scm_misc_error ("st_end_input", "negative position", SCM_EOL); | |
198 | ||
a3c8b9fc | 199 | pt->write_pos = (unsigned char *) (pt->read_pos = pt->read_pos - offset); |
61e452ba | 200 | pt->rw_active = SCM_PORT_NEITHER; |
754c9491 JB |
201 | } |
202 | ||
f1ce9199 LC |
203 | static scm_t_off |
204 | st_seek (SCM port, scm_t_off offset, int whence) | |
754c9491 | 205 | { |
92c2555f | 206 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
f1ce9199 | 207 | scm_t_off target; |
754c9491 | 208 | |
7dcb364d GH |
209 | if (pt->rw_active == SCM_PORT_READ && offset == 0 && whence == SEEK_CUR) |
210 | /* special case to avoid disturbing the unread-char buffer. */ | |
754c9491 | 211 | { |
7dcb364d GH |
212 | if (pt->read_buf == pt->putback_buf) |
213 | { | |
214 | target = pt->saved_read_pos - pt->saved_read_buf | |
215 | - (pt->read_end - pt->read_pos); | |
216 | } | |
217 | else | |
218 | { | |
219 | target = pt->read_pos - pt->read_buf; | |
220 | } | |
754c9491 | 221 | } |
7dcb364d GH |
222 | else |
223 | /* all other cases. */ | |
754c9491 | 224 | { |
7dcb364d GH |
225 | if (pt->rw_active == SCM_PORT_WRITE) |
226 | st_flush (port); | |
227 | ||
228 | if (pt->rw_active == SCM_PORT_READ) | |
229 | scm_end_input (port); | |
230 | ||
231 | switch (whence) | |
232 | { | |
233 | case SEEK_CUR: | |
234 | target = pt->read_pos - pt->read_buf + offset; | |
235 | break; | |
236 | case SEEK_END: | |
237 | target = pt->read_end - pt->read_buf + offset; | |
238 | break; | |
239 | default: /* SEEK_SET */ | |
240 | target = offset; | |
241 | break; | |
242 | } | |
243 | ||
244 | if (target < 0) | |
245 | scm_misc_error ("st_seek", "negative offset", SCM_EOL); | |
246 | ||
247 | if (target >= pt->write_buf_size) | |
3fe6190f | 248 | { |
206d3de3 | 249 | if (!(SCM_CELL_WORD_0 (port) & SCM_WRTNG)) |
3fe6190f | 250 | { |
7dcb364d GH |
251 | if (target > pt->write_buf_size) |
252 | { | |
253 | scm_misc_error ("st_seek", | |
254 | "seek past end of read-only strport", | |
255 | SCM_EOL); | |
256 | } | |
257 | } | |
258 | else | |
259 | { | |
260 | st_resize_port (pt, target + (target == pt->write_buf_size | |
261 | ? SCM_WRITE_BLOCK | |
262 | : 0)); | |
3fe6190f GH |
263 | } |
264 | } | |
7dcb364d GH |
265 | pt->read_pos = pt->write_pos = pt->read_buf + target; |
266 | if (pt->read_pos > pt->read_end) | |
3fe6190f | 267 | { |
7dcb364d GH |
268 | pt->read_end = (unsigned char *) pt->read_pos; |
269 | pt->read_buf_size = pt->read_end - pt->read_buf; | |
3fe6190f | 270 | } |
ee149d03 | 271 | } |
754c9491 JB |
272 | return target; |
273 | } | |
274 | ||
275 | static void | |
f1ce9199 | 276 | st_truncate (SCM port, scm_t_off length) |
754c9491 | 277 | { |
92c2555f | 278 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
3fe6190f GH |
279 | |
280 | if (length > pt->write_buf_size) | |
281 | st_resize_port (pt, length); | |
282 | ||
283 | pt->read_buf_size = length; | |
284 | pt->read_end = pt->read_buf + length; | |
285 | if (pt->read_pos > pt->read_end) | |
286 | pt->read_pos = pt->read_end; | |
754c9491 | 287 | |
3fe6190f GH |
288 | if (pt->write_pos > pt->read_end) |
289 | pt->write_pos = pt->read_end; | |
0f2d19dd JB |
290 | } |
291 | ||
7b041912 LC |
292 | SCM |
293 | scm_mkstrport (SCM pos, SCM str, long modes, const char *caller) | |
0f2d19dd | 294 | { |
7b041912 | 295 | SCM z; |
92c2555f | 296 | scm_t_port *pt; |
7b041912 LC |
297 | size_t str_len, c_pos; |
298 | char *buf, *c_str; | |
fac32b51 | 299 | |
7b041912 LC |
300 | SCM_ASSERT (scm_is_string (str), str, SCM_ARG1, caller); |
301 | c_pos = scm_to_unsigned_integer (pos, 0, scm_i_string_length (str)); | |
e11e83f3 | 302 | |
754c9491 JB |
303 | if (!((modes & SCM_WRTNG) || (modes & SCM_RDNG))) |
304 | scm_misc_error ("scm_mkstrport", "port must read or write", SCM_EOL); | |
5f16b897 | 305 | |
7b041912 LC |
306 | scm_dynwind_begin (0); |
307 | scm_i_dynwind_pthread_mutex_lock (&scm_i_port_table_mutex); | |
308 | ||
da220f27 HWN |
309 | z = scm_new_port_table_entry (scm_tc16_strport); |
310 | pt = SCM_PTAB_ENTRY(z); | |
74a16888 | 311 | SCM_SETSTREAM (z, SCM_UNPACK (str)); |
7b041912 LC |
312 | SCM_SET_CELL_TYPE (z, scm_tc16_strport | modes); |
313 | ||
314 | /* Create a copy of STR in the encoding of Z. */ | |
315 | buf = scm_to_stringn (str, &str_len, pt->encoding, | |
316 | SCM_FAILED_CONVERSION_ERROR); | |
317 | c_str = scm_gc_malloc (str_len, "strport"); | |
318 | memcpy (c_str, buf, str_len); | |
319 | free (buf); | |
320 | ||
321 | pt->write_buf = pt->read_buf = (unsigned char *) c_str; | |
e11e83f3 | 322 | pt->read_pos = pt->write_pos = pt->read_buf + c_pos; |
754c9491 JB |
323 | pt->write_buf_size = pt->read_buf_size = str_len; |
324 | pt->write_end = pt->read_end = pt->read_buf + pt->read_buf_size; | |
3fe6190f | 325 | |
0de97b83 | 326 | pt->rw_random = 1; |
3fe6190f | 327 | |
7b041912 LC |
328 | scm_dynwind_end (); |
329 | ||
330 | /* Ensure WRITE_POS is writable. */ | |
754c9491 JB |
331 | if ((modes & SCM_WRTNG) && pt->write_pos == pt->write_end) |
332 | st_flush (z); | |
25ebc034 | 333 | |
25ebc034 | 334 | scm_i_set_conversion_strategy_x (z, SCM_FAILED_CONVERSION_ERROR); |
0f2d19dd JB |
335 | return z; |
336 | } | |
337 | ||
7b041912 LC |
338 | /* Create a new string from the buffer of PORT, a string port, converting from |
339 | PORT's encoding to the standard string representation. */ | |
340 | SCM | |
341 | scm_strport_to_string (SCM port) | |
3fe6190f | 342 | { |
36284627 | 343 | SCM str; |
7b041912 LC |
344 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
345 | ||
3fe6190f GH |
346 | if (pt->rw_active == SCM_PORT_WRITE) |
347 | st_flush (port); | |
36284627 | 348 | |
fac32b51 MG |
349 | if (pt->read_buf_size == 0) |
350 | return scm_nullstr; | |
351 | ||
352 | if (pt->encoding == NULL) | |
353 | { | |
354 | char *buf; | |
355 | str = scm_i_make_string (pt->read_buf_size, &buf); | |
356 | memcpy (buf, pt->read_buf, pt->read_buf_size); | |
357 | } | |
358 | else | |
f7f4d047 MG |
359 | str = scm_from_stringn ((char *)pt->read_buf, pt->read_buf_size, |
360 | pt->encoding, pt->ilseq_handler); | |
36284627 DH |
361 | scm_remember_upto_here_1 (port); |
362 | return str; | |
3fe6190f GH |
363 | } |
364 | ||
fe78b6c0 KN |
365 | SCM_DEFINE (scm_object_to_string, "object->string", 1, 1, 0, |
366 | (SCM obj, SCM printer), | |
367 | "Return a Scheme string obtained by printing @var{obj}.\n" | |
368 | "Printing function can be specified by the optional second\n" | |
369 | "argument @var{printer} (default: @code{write}).") | |
1f3908c4 KN |
370 | #define FUNC_NAME s_scm_object_to_string |
371 | { | |
fe78b6c0 KN |
372 | SCM str, port; |
373 | ||
374 | if (!SCM_UNBNDP (printer)) | |
375 | SCM_VALIDATE_PROC (2, printer); | |
1f3908c4 | 376 | |
cc95e00a | 377 | str = scm_c_make_string (0, SCM_UNDEFINED); |
1a92274c | 378 | port = scm_mkstrport (SCM_INUM0, str, SCM_OPN | SCM_WRTNG, FUNC_NAME); |
fe78b6c0 KN |
379 | |
380 | if (SCM_UNBNDP (printer)) | |
381 | scm_write (obj, port); | |
382 | else | |
fdc28395 | 383 | scm_call_2 (printer, obj, port); |
fe78b6c0 | 384 | |
1f3908c4 KN |
385 | return scm_strport_to_string (port); |
386 | } | |
387 | #undef FUNC_NAME | |
388 | ||
3b3b36dd | 389 | SCM_DEFINE (scm_call_with_output_string, "call-with-output-string", 1, 0, 0, |
1bbd0b84 | 390 | (SCM proc), |
b380b885 MD |
391 | "Calls the one-argument procedure @var{proc} with a newly created output\n" |
392 | "port. When the function returns, the string composed of the characters\n" | |
393 | "written into the port is returned.") | |
1bbd0b84 | 394 | #define FUNC_NAME s_scm_call_with_output_string |
0f2d19dd JB |
395 | { |
396 | SCM p; | |
754c9491 JB |
397 | |
398 | p = scm_mkstrport (SCM_INUM0, | |
399 | scm_make_string (SCM_INUM0, SCM_UNDEFINED), | |
400 | SCM_OPN | SCM_WRTNG, | |
1bbd0b84 | 401 | FUNC_NAME); |
fdc28395 | 402 | scm_call_1 (proc, p); |
3fe6190f | 403 | |
184b85a3 | 404 | return scm_get_output_string (p); |
0f2d19dd | 405 | } |
1bbd0b84 | 406 | #undef FUNC_NAME |
0f2d19dd | 407 | |
3b3b36dd | 408 | SCM_DEFINE (scm_call_with_input_string, "call-with-input-string", 2, 0, 0, |
1e6808ea MG |
409 | (SCM string, SCM proc), |
410 | "Calls the one-argument procedure @var{proc} with a newly\n" | |
411 | "created input port from which @var{string}'s contents may be\n" | |
412 | "read. The value yielded by the @var{proc} is returned.") | |
1bbd0b84 | 413 | #define FUNC_NAME s_scm_call_with_input_string |
0f2d19dd | 414 | { |
1e6808ea | 415 | SCM p = scm_mkstrport(SCM_INUM0, string, SCM_OPN | SCM_RDNG, FUNC_NAME); |
fdc28395 | 416 | return scm_call_1 (proc, p); |
0f2d19dd | 417 | } |
1bbd0b84 | 418 | #undef FUNC_NAME |
0f2d19dd | 419 | |
e87a03fc MG |
420 | SCM_DEFINE (scm_open_input_string, "open-input-string", 1, 0, 0, |
421 | (SCM str), | |
1e6808ea MG |
422 | "Take a string and return an input port that delivers characters\n" |
423 | "from the string. The port can be closed by\n" | |
e87a03fc MG |
424 | "@code{close-input-port}, though its storage will be reclaimed\n" |
425 | "by the garbage collector if it becomes inaccessible.") | |
426 | #define FUNC_NAME s_scm_open_input_string | |
427 | { | |
428 | SCM p = scm_mkstrport(SCM_INUM0, str, SCM_OPN | SCM_RDNG, FUNC_NAME); | |
429 | return p; | |
430 | } | |
431 | #undef FUNC_NAME | |
432 | ||
433 | SCM_DEFINE (scm_open_output_string, "open-output-string", 0, 0, 0, | |
434 | (void), | |
1e6808ea | 435 | "Return an output port that will accumulate characters for\n" |
e87a03fc MG |
436 | "retrieval by @code{get-output-string}. The port can be closed\n" |
437 | "by the procedure @code{close-output-port}, though its storage\n" | |
438 | "will be reclaimed by the garbage collector if it becomes\n" | |
439 | "inaccessible.") | |
440 | #define FUNC_NAME s_scm_open_output_string | |
441 | { | |
442 | SCM p; | |
443 | ||
444 | p = scm_mkstrport (SCM_INUM0, | |
445 | scm_make_string (SCM_INUM0, SCM_UNDEFINED), | |
446 | SCM_OPN | SCM_WRTNG, | |
447 | FUNC_NAME); | |
448 | return p; | |
449 | } | |
450 | #undef FUNC_NAME | |
451 | ||
452 | SCM_DEFINE (scm_get_output_string, "get-output-string", 1, 0, 0, | |
453 | (SCM port), | |
454 | "Given an output port created by @code{open-output-string},\n" | |
1e6808ea | 455 | "return a string consisting of the characters that have been\n" |
e87a03fc MG |
456 | "output to the port so far.") |
457 | #define FUNC_NAME s_scm_get_output_string | |
458 | { | |
459 | SCM_VALIDATE_OPOUTSTRPORT (1, port); | |
460 | return scm_strport_to_string (port); | |
461 | } | |
462 | #undef FUNC_NAME | |
1cc91f1b | 463 | |
cd07a097 | 464 | |
a8aa30d8 MD |
465 | /* Given a null-terminated string EXPR containing a Scheme expression |
466 | read it, and return it as an SCM value. */ | |
467 | SCM | |
ca13a04a | 468 | scm_c_read_string (const char *expr) |
a8aa30d8 | 469 | { |
889975e5 MG |
470 | /* FIXME: the c string gets packed into a string, only to get |
471 | immediately unpacked in scm_mkstrport. */ | |
3fe6190f | 472 | SCM port = scm_mkstrport (SCM_INUM0, |
cc95e00a | 473 | scm_from_locale_string (expr), |
a8aa30d8 | 474 | SCM_OPN | SCM_RDNG, |
ca13a04a | 475 | "scm_c_read_string"); |
a8aa30d8 MD |
476 | SCM form; |
477 | ||
478 | /* Read expressions from that port; ignore the values. */ | |
deca31e1 | 479 | form = scm_read (port); |
a8aa30d8 MD |
480 | |
481 | scm_close_port (port); | |
482 | return form; | |
483 | } | |
484 | ||
cd07a097 | 485 | /* Given a null-terminated string EXPR containing Scheme program text, |
a8aa30d8 MD |
486 | evaluate it, and return the result of the last expression evaluated. */ |
487 | SCM | |
ca13a04a | 488 | scm_c_eval_string (const char *expr) |
cd07a097 | 489 | { |
cc95e00a | 490 | return scm_eval_string (scm_from_locale_string (expr)); |
b377f53e JB |
491 | } |
492 | ||
209b52fe MV |
493 | SCM |
494 | scm_c_eval_string_in_module (const char *expr, SCM module) | |
495 | { | |
cc95e00a | 496 | return scm_eval_string_in_module (scm_from_locale_string (expr), module); |
209b52fe MV |
497 | } |
498 | ||
499 | ||
96e83482 MV |
500 | static SCM |
501 | inner_eval_string (void *data) | |
b377f53e | 502 | { |
96e83482 | 503 | SCM port = (SCM)data; |
cd07a097 | 504 | SCM form; |
b377f53e | 505 | SCM ans = SCM_UNSPECIFIED; |
cd07a097 JB |
506 | |
507 | /* Read expressions from that port; ignore the values. */ | |
0c32d76c | 508 | while (!SCM_EOF_OBJECT_P (form = scm_read (port))) |
96e83482 | 509 | ans = scm_primitive_eval_x (form); |
cd07a097 | 510 | |
0d7368d7 JB |
511 | /* Don't close the port here; if we re-enter this function via a |
512 | continuation, then the next time we enter it, we'll get an error. | |
513 | It's a string port anyway, so there's no advantage to closing it | |
514 | early. */ | |
515 | ||
a8aa30d8 | 516 | return ans; |
cd07a097 | 517 | } |
96e83482 | 518 | |
209b52fe MV |
519 | SCM_DEFINE (scm_eval_string_in_module, "eval-string", 1, 1, 0, |
520 | (SCM string, SCM module), | |
96e83482 MV |
521 | "Evaluate @var{string} as the text representation of a Scheme\n" |
522 | "form or forms, and return whatever value they produce.\n" | |
209b52fe MV |
523 | "Evaluation takes place in the given module, or the current\n" |
524 | "module when no module is given.\n" | |
525 | "While the code is evaluated, the given module is made the\n" | |
526 | "current one. The current module is restored when this\n" | |
527 | "procedure returns.") | |
528 | #define FUNC_NAME s_scm_eval_string_in_module | |
96e83482 MV |
529 | { |
530 | SCM port = scm_mkstrport (SCM_INUM0, string, SCM_OPN | SCM_RDNG, | |
209b52fe MV |
531 | FUNC_NAME); |
532 | if (SCM_UNBNDP (module)) | |
533 | module = scm_current_module (); | |
aeec5be1 MV |
534 | else |
535 | SCM_VALIDATE_MODULE (2, module); | |
209b52fe | 536 | return scm_c_call_with_current_module (module, |
96e83482 MV |
537 | inner_eval_string, (void *)port); |
538 | } | |
1bbd0b84 | 539 | #undef FUNC_NAME |
cd07a097 | 540 | |
209b52fe MV |
541 | SCM |
542 | scm_eval_string (SCM string) | |
543 | { | |
544 | return scm_eval_string_in_module (string, SCM_UNDEFINED); | |
545 | } | |
546 | ||
92c2555f | 547 | static scm_t_bits |
0b6881fa | 548 | scm_make_stptob () |
0f2d19dd | 549 | { |
92c2555f | 550 | scm_t_bits tc = scm_make_port_type ("string", stfill_buffer, st_write); |
a98bddfd | 551 | |
affc96b5 GH |
552 | scm_set_port_end_input (tc, st_end_input); |
553 | scm_set_port_flush (tc, st_flush); | |
6c747373 | 554 | scm_set_port_seek (tc, st_seek); |
affc96b5 | 555 | scm_set_port_truncate (tc, st_truncate); |
a98bddfd DH |
556 | |
557 | return tc; | |
0f2d19dd JB |
558 | } |
559 | ||
0f2d19dd JB |
560 | void |
561 | scm_init_strports () | |
0f2d19dd | 562 | { |
a98bddfd DH |
563 | scm_tc16_strport = scm_make_stptob (); |
564 | ||
a0599745 | 565 | #include "libguile/strports.x" |
0f2d19dd JB |
566 | } |
567 | ||
89e00824 ML |
568 | |
569 | /* | |
570 | Local Variables: | |
571 | c-file-style: "gnu" | |
572 | End: | |
573 | */ |