Commit | Line | Data |
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574b7be0 | 1 | /* Copyright (C) 1995,1996,1998,1999,2000,2001,2002, 2003, 2005, 2006, 2009, 2010, 2011 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 | ||
691fcf66 | 33 | #include "libguile/bytevectors.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 | 57 | |
691fcf66 LC |
58 | write_buf/write_end point to the ends of the allocated bytevector. |
59 | read_buf/read_end in principle point to the part of the bytevector which | |
3fe6190f GH |
60 | has been written to, but this is only updated after a flush. |
61 | read_pos and write_pos in principle should be equal, but this is only true | |
61e452ba | 62 | when rw_active is SCM_PORT_NEITHER. |
bf5ad0da KR |
63 | |
64 | ENHANCE-ME - output blocks: | |
65 | ||
66 | The current code keeps an output string as a single block. That means | |
67 | when the size is increased the entire old contents must be copied. It'd | |
68 | be more efficient to begin a new block when the old one is full, so | |
69 | there's no re-copying of previous data. | |
70 | ||
71 | To make seeking efficient, keeping the pieces in a vector might be best, | |
72 | though appending is probably the most common operation. The size of each | |
73 | block could be progressively increased, so the bigger the string the | |
74 | bigger the blocks. | |
75 | ||
76 | When `get-output-string' is called the blocks have to be coalesced into a | |
77 | string, the result could be kept as a single big block. If blocks were | |
78 | strings then `get-output-string' could notice when there's just one and | |
79 | return that with a copy-on-write (though repeated calls to | |
80 | `get-output-string' are probably unlikely). | |
81 | ||
82 | Another possibility would be to extend the port mechanism to let SCM | |
83 | strings come through directly from `display' and friends. That way if a | |
84 | big string is written it can be kept as a copy-on-write, saving time | |
85 | copying and maybe saving some space. */ | |
86 | ||
1cc91f1b | 87 | |
92c2555f | 88 | scm_t_bits scm_tc16_strport; |
a98bddfd DH |
89 | |
90 | ||
ee149d03 JB |
91 | static int |
92 | stfill_buffer (SCM port) | |
0f2d19dd | 93 | { |
92c2555f | 94 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
ee149d03 | 95 | |
ee149d03 JB |
96 | if (pt->read_pos >= pt->read_end) |
97 | return EOF; | |
98 | else | |
41b0806d | 99 | return scm_return_first_int (*pt->read_pos, port); |
0f2d19dd JB |
100 | } |
101 | ||
691fcf66 LC |
102 | /* Change the size of a port's bytevector to NEW_SIZE. This doesn't |
103 | change `read_buf_size'. */ | |
104 | static void | |
f1ce9199 | 105 | st_resize_port (scm_t_port *pt, scm_t_off new_size) |
754c9491 | 106 | { |
94115ae3 | 107 | SCM old_stream = SCM_PACK (pt->stream); |
691fcf66 LC |
108 | const signed char *src = SCM_BYTEVECTOR_CONTENTS (old_stream); |
109 | SCM new_stream = scm_c_make_bytevector (new_size); | |
110 | signed char *dst = SCM_BYTEVECTOR_CONTENTS (new_stream); | |
111 | unsigned long int old_size = SCM_BYTEVECTOR_LENGTH (old_stream); | |
c014a02e | 112 | unsigned long int min_size = min (old_size, new_size); |
74a16888 | 113 | |
f1ce9199 | 114 | scm_t_off index = pt->write_pos - pt->write_buf; |
3fe6190f GH |
115 | |
116 | pt->write_buf_size = new_size; | |
117 | ||
691fcf66 | 118 | memcpy (dst, src, min_size); |
8824ac88 MV |
119 | |
120 | scm_remember_upto_here_1 (old_stream); | |
754c9491 | 121 | |
94115ae3 | 122 | /* reset buffer. */ |
754c9491 | 123 | { |
729dbac3 | 124 | pt->stream = SCM_UNPACK (new_stream); |
5a6d139b | 125 | pt->read_buf = pt->write_buf = (unsigned char *)dst; |
3fe6190f GH |
126 | pt->read_pos = pt->write_pos = pt->write_buf + index; |
127 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
128 | pt->read_end = pt->read_buf + pt->read_buf_size; | |
754c9491 JB |
129 | } |
130 | } | |
131 | ||
d8f1c216 LC |
132 | /* Ensure that `write_pos' < `write_end' by enlarging the buffer when |
133 | necessary. Update `read_buf' to account for written chars. The | |
134 | buffer is enlarged geometrically. */ | |
ee149d03 JB |
135 | static void |
136 | st_flush (SCM port) | |
0f2d19dd | 137 | { |
92c2555f | 138 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
ee149d03 JB |
139 | |
140 | if (pt->write_pos == pt->write_end) | |
d8f1c216 LC |
141 | st_resize_port (pt, pt->write_buf_size * 2); |
142 | ||
754c9491 | 143 | pt->read_pos = pt->write_pos; |
3fe6190f GH |
144 | if (pt->read_pos > pt->read_end) |
145 | { | |
146 | pt->read_end = (unsigned char *) pt->read_pos; | |
147 | pt->read_buf_size = pt->read_end - pt->read_buf; | |
148 | } | |
61e452ba | 149 | pt->rw_active = SCM_PORT_NEITHER; |
754c9491 JB |
150 | } |
151 | ||
31703ab8 | 152 | static void |
8aa011a1 | 153 | st_write (SCM port, const void *data, size_t size) |
31703ab8 | 154 | { |
92c2555f | 155 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
31703ab8 GH |
156 | const char *input = (char *) data; |
157 | ||
158 | while (size > 0) | |
159 | { | |
160 | int space = pt->write_end - pt->write_pos; | |
161 | int write_len = (size > space) ? space : size; | |
162 | ||
4b8ec619 | 163 | memcpy ((char *) pt->write_pos, input, write_len); |
31703ab8 GH |
164 | pt->write_pos += write_len; |
165 | size -= write_len; | |
166 | input += write_len; | |
167 | if (write_len == space) | |
168 | st_flush (port); | |
169 | } | |
170 | } | |
171 | ||
754c9491 | 172 | static void |
affc96b5 | 173 | st_end_input (SCM port, int offset) |
754c9491 | 174 | { |
92c2555f | 175 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
7dcb364d | 176 | |
cd19d608 GH |
177 | if (pt->read_pos - pt->read_buf < offset) |
178 | scm_misc_error ("st_end_input", "negative position", SCM_EOL); | |
179 | ||
a3c8b9fc | 180 | pt->write_pos = (unsigned char *) (pt->read_pos = pt->read_pos - offset); |
61e452ba | 181 | pt->rw_active = SCM_PORT_NEITHER; |
754c9491 JB |
182 | } |
183 | ||
f1ce9199 LC |
184 | static scm_t_off |
185 | st_seek (SCM port, scm_t_off offset, int whence) | |
754c9491 | 186 | { |
92c2555f | 187 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
f1ce9199 | 188 | scm_t_off target; |
754c9491 | 189 | |
7dcb364d GH |
190 | if (pt->rw_active == SCM_PORT_READ && offset == 0 && whence == SEEK_CUR) |
191 | /* special case to avoid disturbing the unread-char buffer. */ | |
754c9491 | 192 | { |
7dcb364d GH |
193 | if (pt->read_buf == pt->putback_buf) |
194 | { | |
195 | target = pt->saved_read_pos - pt->saved_read_buf | |
196 | - (pt->read_end - pt->read_pos); | |
197 | } | |
198 | else | |
199 | { | |
200 | target = pt->read_pos - pt->read_buf; | |
201 | } | |
754c9491 | 202 | } |
7dcb364d GH |
203 | else |
204 | /* all other cases. */ | |
754c9491 | 205 | { |
7dcb364d GH |
206 | if (pt->rw_active == SCM_PORT_WRITE) |
207 | st_flush (port); | |
208 | ||
209 | if (pt->rw_active == SCM_PORT_READ) | |
210 | scm_end_input (port); | |
211 | ||
212 | switch (whence) | |
213 | { | |
214 | case SEEK_CUR: | |
215 | target = pt->read_pos - pt->read_buf + offset; | |
216 | break; | |
217 | case SEEK_END: | |
218 | target = pt->read_end - pt->read_buf + offset; | |
219 | break; | |
220 | default: /* SEEK_SET */ | |
221 | target = offset; | |
222 | break; | |
223 | } | |
224 | ||
225 | if (target < 0) | |
226 | scm_misc_error ("st_seek", "negative offset", SCM_EOL); | |
227 | ||
228 | if (target >= pt->write_buf_size) | |
3fe6190f | 229 | { |
206d3de3 | 230 | if (!(SCM_CELL_WORD_0 (port) & SCM_WRTNG)) |
3fe6190f | 231 | { |
7dcb364d GH |
232 | if (target > pt->write_buf_size) |
233 | { | |
234 | scm_misc_error ("st_seek", | |
235 | "seek past end of read-only strport", | |
236 | SCM_EOL); | |
237 | } | |
238 | } | |
d8f1c216 LC |
239 | else if (target == pt->write_buf_size) |
240 | st_resize_port (pt, target * 2); | |
3fe6190f | 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 | |
f1ce9199 | 253 | st_truncate (SCM port, scm_t_off length) |
754c9491 | 254 | { |
92c2555f | 255 | scm_t_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 | ||
0b2c2ba3 LC |
269 | /* The initial size in bytes of a string port's buffer. */ |
270 | #define INITIAL_BUFFER_SIZE 128 | |
271 | ||
272 | /* Return a new string port with MODES. If STR is #f, a new backing | |
273 | buffer is allocated; otherwise STR must be a string and a copy of it | |
274 | serves as the buffer for the new port. */ | |
7b041912 LC |
275 | SCM |
276 | scm_mkstrport (SCM pos, SCM str, long modes, const char *caller) | |
0f2d19dd | 277 | { |
691fcf66 | 278 | SCM z, buf; |
92c2555f | 279 | scm_t_port *pt; |
7b041912 | 280 | size_t str_len, c_pos; |
691fcf66 | 281 | char *c_buf; |
e11e83f3 | 282 | |
754c9491 JB |
283 | if (!((modes & SCM_WRTNG) || (modes & SCM_RDNG))) |
284 | scm_misc_error ("scm_mkstrport", "port must read or write", SCM_EOL); | |
5f16b897 | 285 | |
7b041912 LC |
286 | scm_dynwind_begin (0); |
287 | scm_i_dynwind_pthread_mutex_lock (&scm_i_port_table_mutex); | |
288 | ||
da220f27 HWN |
289 | z = scm_new_port_table_entry (scm_tc16_strport); |
290 | pt = SCM_PTAB_ENTRY(z); | |
7b041912 | 291 | |
0b2c2ba3 LC |
292 | if (scm_is_false (str)) |
293 | { | |
294 | /* Allocate a new buffer to write to. */ | |
295 | str_len = INITIAL_BUFFER_SIZE; | |
296 | buf = scm_c_make_bytevector (str_len); | |
297 | c_buf = (char *) SCM_BYTEVECTOR_CONTENTS (buf); | |
298 | ||
299 | /* Reset `read_buf_size'. It will contain the actual number of | |
300 | bytes written to PT. */ | |
301 | pt->read_buf_size = 0; | |
302 | c_pos = 0; | |
303 | } | |
304 | else | |
305 | { | |
306 | /* STR is a string. */ | |
307 | char *copy; | |
691fcf66 | 308 | |
0b2c2ba3 | 309 | SCM_ASSERT (scm_is_string (str), str, SCM_ARG1, caller); |
691fcf66 | 310 | |
0b2c2ba3 LC |
311 | /* Create a copy of STR in the encoding of PT. */ |
312 | copy = scm_to_stringn (str, &str_len, pt->encoding, | |
313 | SCM_FAILED_CONVERSION_ERROR); | |
314 | buf = scm_c_make_bytevector (str_len); | |
315 | c_buf = (char *) SCM_BYTEVECTOR_CONTENTS (buf); | |
316 | memcpy (c_buf, copy, str_len); | |
317 | free (copy); | |
691fcf66 | 318 | |
0b2c2ba3 LC |
319 | c_pos = scm_to_unsigned_integer (pos, 0, str_len); |
320 | pt->read_buf_size = str_len; | |
321 | } | |
691fcf66 LC |
322 | |
323 | SCM_SETSTREAM (z, SCM_UNPACK (buf)); | |
324 | SCM_SET_CELL_TYPE (z, scm_tc16_strport | modes); | |
7b041912 | 325 | |
691fcf66 | 326 | pt->write_buf = pt->read_buf = (unsigned char *) c_buf; |
e11e83f3 | 327 | pt->read_pos = pt->write_pos = pt->read_buf + c_pos; |
691fcf66 | 328 | pt->write_buf_size = str_len; |
754c9491 | 329 | pt->write_end = pt->read_end = pt->read_buf + pt->read_buf_size; |
3fe6190f | 330 | |
0de97b83 | 331 | pt->rw_random = 1; |
3fe6190f | 332 | |
7b041912 LC |
333 | scm_dynwind_end (); |
334 | ||
335 | /* Ensure WRITE_POS is writable. */ | |
754c9491 JB |
336 | if ((modes & SCM_WRTNG) && pt->write_pos == pt->write_end) |
337 | st_flush (z); | |
25ebc034 | 338 | |
25ebc034 | 339 | scm_i_set_conversion_strategy_x (z, SCM_FAILED_CONVERSION_ERROR); |
0f2d19dd JB |
340 | return z; |
341 | } | |
342 | ||
7b041912 LC |
343 | /* Create a new string from the buffer of PORT, a string port, converting from |
344 | PORT's encoding to the standard string representation. */ | |
345 | SCM | |
346 | scm_strport_to_string (SCM port) | |
3fe6190f | 347 | { |
36284627 | 348 | SCM str; |
7b041912 LC |
349 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
350 | ||
3fe6190f GH |
351 | if (pt->rw_active == SCM_PORT_WRITE) |
352 | st_flush (port); | |
36284627 | 353 | |
fac32b51 MG |
354 | if (pt->read_buf_size == 0) |
355 | return scm_nullstr; | |
356 | ||
357 | if (pt->encoding == NULL) | |
358 | { | |
359 | char *buf; | |
190d4b0d | 360 | str = scm_i_make_string (pt->read_buf_size, &buf, 0); |
fac32b51 MG |
361 | memcpy (buf, pt->read_buf, pt->read_buf_size); |
362 | } | |
363 | else | |
f7f4d047 MG |
364 | str = scm_from_stringn ((char *)pt->read_buf, pt->read_buf_size, |
365 | pt->encoding, pt->ilseq_handler); | |
36284627 DH |
366 | scm_remember_upto_here_1 (port); |
367 | return str; | |
3fe6190f GH |
368 | } |
369 | ||
fe78b6c0 KN |
370 | SCM_DEFINE (scm_object_to_string, "object->string", 1, 1, 0, |
371 | (SCM obj, SCM printer), | |
372 | "Return a Scheme string obtained by printing @var{obj}.\n" | |
373 | "Printing function can be specified by the optional second\n" | |
374 | "argument @var{printer} (default: @code{write}).") | |
1f3908c4 KN |
375 | #define FUNC_NAME s_scm_object_to_string |
376 | { | |
8b263377 | 377 | SCM port, result; |
fe78b6c0 KN |
378 | |
379 | if (!SCM_UNBNDP (printer)) | |
380 | SCM_VALIDATE_PROC (2, printer); | |
1f3908c4 | 381 | |
0b2c2ba3 LC |
382 | port = scm_mkstrport (SCM_INUM0, SCM_BOOL_F, |
383 | SCM_OPN | SCM_WRTNG, FUNC_NAME); | |
fe78b6c0 KN |
384 | |
385 | if (SCM_UNBNDP (printer)) | |
386 | scm_write (obj, port); | |
387 | else | |
fdc28395 | 388 | scm_call_2 (printer, obj, port); |
fe78b6c0 | 389 | |
8b263377 LC |
390 | result = scm_strport_to_string (port); |
391 | ||
392 | /* Explicitly close PORT so that the iconv CDs associated with it are | |
393 | deallocated right away. This is important because CDs use a lot of | |
394 | memory that's not visible to the GC, so not freeing them can lead | |
395 | to almost large heap usage. See | |
396 | <http://wingolog.org/archives/2011/02/25/ports-weaks-gc-and-dark-matter> | |
397 | for details. */ | |
398 | scm_close_port (port); | |
399 | ||
400 | return result; | |
1f3908c4 KN |
401 | } |
402 | #undef FUNC_NAME | |
403 | ||
3b3b36dd | 404 | SCM_DEFINE (scm_call_with_output_string, "call-with-output-string", 1, 0, 0, |
1bbd0b84 | 405 | (SCM proc), |
b380b885 MD |
406 | "Calls the one-argument procedure @var{proc} with a newly created output\n" |
407 | "port. When the function returns, the string composed of the characters\n" | |
408 | "written into the port is returned.") | |
1bbd0b84 | 409 | #define FUNC_NAME s_scm_call_with_output_string |
0f2d19dd JB |
410 | { |
411 | SCM p; | |
754c9491 | 412 | |
0b2c2ba3 | 413 | p = scm_mkstrport (SCM_INUM0, SCM_BOOL_F, |
754c9491 | 414 | SCM_OPN | SCM_WRTNG, |
1bbd0b84 | 415 | FUNC_NAME); |
fdc28395 | 416 | scm_call_1 (proc, p); |
3fe6190f | 417 | |
184b85a3 | 418 | return scm_get_output_string (p); |
0f2d19dd | 419 | } |
1bbd0b84 | 420 | #undef FUNC_NAME |
0f2d19dd | 421 | |
3b3b36dd | 422 | SCM_DEFINE (scm_call_with_input_string, "call-with-input-string", 2, 0, 0, |
1e6808ea MG |
423 | (SCM string, SCM proc), |
424 | "Calls the one-argument procedure @var{proc} with a newly\n" | |
425 | "created input port from which @var{string}'s contents may be\n" | |
426 | "read. The value yielded by the @var{proc} is returned.") | |
1bbd0b84 | 427 | #define FUNC_NAME s_scm_call_with_input_string |
0f2d19dd | 428 | { |
1e6808ea | 429 | SCM p = scm_mkstrport(SCM_INUM0, string, SCM_OPN | SCM_RDNG, FUNC_NAME); |
fdc28395 | 430 | return scm_call_1 (proc, p); |
0f2d19dd | 431 | } |
1bbd0b84 | 432 | #undef FUNC_NAME |
0f2d19dd | 433 | |
e87a03fc MG |
434 | SCM_DEFINE (scm_open_input_string, "open-input-string", 1, 0, 0, |
435 | (SCM str), | |
1e6808ea MG |
436 | "Take a string and return an input port that delivers characters\n" |
437 | "from the string. The port can be closed by\n" | |
e87a03fc MG |
438 | "@code{close-input-port}, though its storage will be reclaimed\n" |
439 | "by the garbage collector if it becomes inaccessible.") | |
440 | #define FUNC_NAME s_scm_open_input_string | |
441 | { | |
442 | SCM p = scm_mkstrport(SCM_INUM0, str, SCM_OPN | SCM_RDNG, FUNC_NAME); | |
443 | return p; | |
444 | } | |
445 | #undef FUNC_NAME | |
446 | ||
447 | SCM_DEFINE (scm_open_output_string, "open-output-string", 0, 0, 0, | |
448 | (void), | |
1e6808ea | 449 | "Return an output port that will accumulate characters for\n" |
e87a03fc MG |
450 | "retrieval by @code{get-output-string}. The port can be closed\n" |
451 | "by the procedure @code{close-output-port}, though its storage\n" | |
452 | "will be reclaimed by the garbage collector if it becomes\n" | |
453 | "inaccessible.") | |
454 | #define FUNC_NAME s_scm_open_output_string | |
455 | { | |
456 | SCM p; | |
457 | ||
0b2c2ba3 | 458 | p = scm_mkstrport (SCM_INUM0, SCM_BOOL_F, |
e87a03fc MG |
459 | SCM_OPN | SCM_WRTNG, |
460 | FUNC_NAME); | |
461 | return p; | |
462 | } | |
463 | #undef FUNC_NAME | |
464 | ||
465 | SCM_DEFINE (scm_get_output_string, "get-output-string", 1, 0, 0, | |
466 | (SCM port), | |
467 | "Given an output port created by @code{open-output-string},\n" | |
1e6808ea | 468 | "return a string consisting of the characters that have been\n" |
e87a03fc MG |
469 | "output to the port so far.") |
470 | #define FUNC_NAME s_scm_get_output_string | |
471 | { | |
472 | SCM_VALIDATE_OPOUTSTRPORT (1, port); | |
473 | return scm_strport_to_string (port); | |
474 | } | |
475 | #undef FUNC_NAME | |
1cc91f1b | 476 | |
cd07a097 | 477 | |
a8aa30d8 MD |
478 | /* Given a null-terminated string EXPR containing a Scheme expression |
479 | read it, and return it as an SCM value. */ | |
480 | SCM | |
ca13a04a | 481 | scm_c_read_string (const char *expr) |
a8aa30d8 | 482 | { |
3fe6190f | 483 | SCM port = scm_mkstrport (SCM_INUM0, |
cc95e00a | 484 | scm_from_locale_string (expr), |
a8aa30d8 | 485 | SCM_OPN | SCM_RDNG, |
ca13a04a | 486 | "scm_c_read_string"); |
a8aa30d8 MD |
487 | SCM form; |
488 | ||
deca31e1 | 489 | form = scm_read (port); |
a8aa30d8 MD |
490 | |
491 | scm_close_port (port); | |
492 | return form; | |
493 | } | |
494 | ||
cd07a097 | 495 | /* Given a null-terminated string EXPR containing Scheme program text, |
a8aa30d8 MD |
496 | evaluate it, and return the result of the last expression evaluated. */ |
497 | SCM | |
ca13a04a | 498 | scm_c_eval_string (const char *expr) |
cd07a097 | 499 | { |
cc95e00a | 500 | return scm_eval_string (scm_from_locale_string (expr)); |
b377f53e JB |
501 | } |
502 | ||
209b52fe MV |
503 | SCM |
504 | scm_c_eval_string_in_module (const char *expr, SCM module) | |
505 | { | |
cc95e00a | 506 | return scm_eval_string_in_module (scm_from_locale_string (expr), module); |
209b52fe MV |
507 | } |
508 | ||
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 | 520 | { |
0b0e066a AW |
521 | static SCM eval_string = SCM_BOOL_F, k_module = SCM_BOOL_F; |
522 | ||
523 | if (scm_is_false (eval_string)) | |
524 | { | |
525 | eval_string = scm_c_public_lookup ("ice-9 eval-string", "eval-string"); | |
526 | k_module = scm_from_locale_keyword ("module"); | |
527 | } | |
528 | ||
209b52fe MV |
529 | if (SCM_UNBNDP (module)) |
530 | module = scm_current_module (); | |
aeec5be1 MV |
531 | else |
532 | SCM_VALIDATE_MODULE (2, module); | |
0b0e066a AW |
533 | |
534 | return scm_call_3 (scm_variable_ref (eval_string), string, k_module, module); | |
96e83482 | 535 | } |
1bbd0b84 | 536 | #undef FUNC_NAME |
cd07a097 | 537 | |
209b52fe MV |
538 | SCM |
539 | scm_eval_string (SCM string) | |
540 | { | |
541 | return scm_eval_string_in_module (string, SCM_UNDEFINED); | |
542 | } | |
543 | ||
92c2555f | 544 | static scm_t_bits |
0b6881fa | 545 | scm_make_stptob () |
0f2d19dd | 546 | { |
92c2555f | 547 | scm_t_bits tc = scm_make_port_type ("string", stfill_buffer, st_write); |
a98bddfd | 548 | |
affc96b5 GH |
549 | scm_set_port_end_input (tc, st_end_input); |
550 | scm_set_port_flush (tc, st_flush); | |
6c747373 | 551 | scm_set_port_seek (tc, st_seek); |
affc96b5 | 552 | scm_set_port_truncate (tc, st_truncate); |
a98bddfd DH |
553 | |
554 | return tc; | |
0f2d19dd JB |
555 | } |
556 | ||
0f2d19dd JB |
557 | void |
558 | scm_init_strports () | |
0f2d19dd | 559 | { |
a98bddfd DH |
560 | scm_tc16_strport = scm_make_stptob (); |
561 | ||
a0599745 | 562 | #include "libguile/strports.x" |
0f2d19dd JB |
563 | } |
564 | ||
89e00824 ML |
565 | |
566 | /* | |
567 | Local Variables: | |
568 | c-file-style: "gnu" | |
569 | End: | |
570 | */ |