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754c9491 | 1 | /* Copyright (C) 1995,1996,1998,1999 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. */ |
0f2d19dd JB |
41 | \f |
42 | ||
43 | #include <stdio.h> | |
44 | #include "_scm.h" | |
20e6290e JB |
45 | #include "unif.h" |
46 | #include "eval.h" | |
cd07a097 | 47 | #include "read.h" |
20e6290e JB |
48 | |
49 | #include "strports.h" | |
0f2d19dd | 50 | |
95b88819 GH |
51 | #ifdef HAVE_STRING_H |
52 | #include <string.h> | |
53 | #endif | |
54 | ||
0f2d19dd JB |
55 | \f |
56 | ||
57 | /* {Ports - string ports} | |
58 | * | |
59 | */ | |
60 | ||
3fe6190f GH |
61 | /* NOTES: |
62 | write_buf/write_end point to the ends of the allocated string. | |
63 | read_buf/read_end in principle point to the part of the string which | |
64 | has been written to, but this is only updated after a flush. | |
65 | read_pos and write_pos in principle should be equal, but this is only true | |
66 | when rw_active is 0. | |
67 | */ | |
1cc91f1b | 68 | |
ee149d03 JB |
69 | static int |
70 | stfill_buffer (SCM port) | |
0f2d19dd | 71 | { |
754c9491 | 72 | scm_port *pt = SCM_PTAB_ENTRY (port); |
ee149d03 | 73 | |
ee149d03 JB |
74 | if (pt->read_pos >= pt->read_end) |
75 | return EOF; | |
76 | else | |
5c070ca7 | 77 | return scm_return_first (*pt->read_pos, port); |
0f2d19dd JB |
78 | } |
79 | ||
3fe6190f GH |
80 | /* change the size of a port's string to new_size. this doesn't |
81 | change read_buf_size. */ | |
754c9491 | 82 | static void |
3fe6190f | 83 | st_resize_port (scm_port *pt, off_t new_size) |
754c9491 | 84 | { |
3fe6190f GH |
85 | off_t index = pt->write_pos - pt->write_buf; |
86 | ||
87 | pt->write_buf_size = new_size; | |
88 | ||
89 | scm_vector_set_length_x (pt->stream, SCM_MAKINUM (new_size)); | |
754c9491 | 90 | |
754c9491 JB |
91 | /* reset buffer in case reallocation moved the string. */ |
92 | { | |
754c9491 | 93 | pt->read_buf = pt->write_buf = SCM_CHARS (pt->stream); |
3fe6190f GH |
94 | pt->read_pos = pt->write_pos = pt->write_buf + index; |
95 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
96 | pt->read_end = pt->read_buf + pt->read_buf_size; | |
754c9491 JB |
97 | } |
98 | } | |
99 | ||
3fe6190f GH |
100 | /* amount by which write_buf is expanded. */ |
101 | #define SCM_WRITE_BLOCK 80 | |
102 | ||
103 | /* ensure that write_pos < write_end by enlarging the buffer when | |
104 | necessary. update read_buf to account for written chars. */ | |
ee149d03 JB |
105 | static void |
106 | st_flush (SCM port) | |
0f2d19dd | 107 | { |
754c9491 | 108 | scm_port *pt = SCM_PTAB_ENTRY (port); |
ee149d03 JB |
109 | |
110 | if (pt->write_pos == pt->write_end) | |
111 | { | |
3fe6190f | 112 | st_resize_port (pt, pt->write_buf_size + SCM_WRITE_BLOCK); |
754c9491 JB |
113 | } |
114 | pt->read_pos = pt->write_pos; | |
3fe6190f GH |
115 | if (pt->read_pos > pt->read_end) |
116 | { | |
117 | pt->read_end = (unsigned char *) pt->read_pos; | |
118 | pt->read_buf_size = pt->read_end - pt->read_buf; | |
119 | } | |
754c9491 JB |
120 | pt->rw_active = 0; |
121 | } | |
122 | ||
31703ab8 GH |
123 | static void |
124 | st_write (SCM port, void *data, size_t size) | |
125 | { | |
126 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
127 | const char *input = (char *) data; | |
128 | ||
129 | while (size > 0) | |
130 | { | |
131 | int space = pt->write_end - pt->write_pos; | |
132 | int write_len = (size > space) ? space : size; | |
133 | ||
134 | strncpy (pt->write_pos, input, write_len); | |
135 | pt->write_pos += write_len; | |
136 | size -= write_len; | |
137 | input += write_len; | |
138 | if (write_len == space) | |
139 | st_flush (port); | |
140 | } | |
141 | } | |
142 | ||
754c9491 | 143 | static void |
affc96b5 | 144 | st_end_input (SCM port, int offset) |
754c9491 JB |
145 | { |
146 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
147 | ||
148 | pt->write_pos = (unsigned char *) pt->read_pos; | |
149 | pt->rw_active = 0; | |
150 | } | |
151 | ||
152 | static off_t | |
153 | st_seek (SCM port, off_t offset, int whence) | |
154 | { | |
155 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
156 | off_t target; | |
157 | ||
3fe6190f | 158 | /* we can assume at this point that pt->write_pos == pt->read_pos. */ |
754c9491 JB |
159 | switch (whence) |
160 | { | |
161 | case SEEK_CUR: | |
3fe6190f | 162 | target = pt->read_pos - pt->read_buf + offset; |
754c9491 JB |
163 | break; |
164 | case SEEK_END: | |
3fe6190f | 165 | target = pt->read_end - pt->read_buf + offset; |
754c9491 JB |
166 | break; |
167 | default: /* SEEK_SET */ | |
168 | target = offset; | |
169 | break; | |
170 | } | |
171 | if (target < 0) | |
3fe6190f GH |
172 | scm_misc_error ("st_seek", "negative offset", SCM_EOL); |
173 | if (target >= pt->write_buf_size) | |
754c9491 | 174 | { |
3fe6190f GH |
175 | if (!(SCM_CAR (port) & SCM_WRTNG)) |
176 | { | |
177 | if (target > pt->write_buf_size) | |
178 | { | |
179 | scm_misc_error ("st_seek", "seek past end of read-only strport", | |
180 | SCM_EOL); | |
181 | } | |
182 | } | |
183 | else | |
184 | { | |
185 | st_resize_port (pt, target + (target == pt->write_buf_size | |
186 | ? SCM_WRITE_BLOCK | |
187 | : 0)); | |
188 | } | |
ee149d03 | 189 | } |
754c9491 | 190 | pt->read_pos = pt->write_pos = pt->read_buf + target; |
3fe6190f GH |
191 | if (pt->read_pos > pt->read_end) |
192 | { | |
193 | pt->read_end = (unsigned char *) pt->read_pos; | |
194 | pt->read_buf_size = pt->read_end - pt->read_buf; | |
195 | } | |
754c9491 JB |
196 | return target; |
197 | } | |
198 | ||
199 | static void | |
affc96b5 | 200 | st_truncate (SCM port, off_t length) |
754c9491 JB |
201 | { |
202 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
3fe6190f GH |
203 | |
204 | if (length > pt->write_buf_size) | |
205 | st_resize_port (pt, length); | |
206 | ||
207 | pt->read_buf_size = length; | |
208 | pt->read_end = pt->read_buf + length; | |
209 | if (pt->read_pos > pt->read_end) | |
210 | pt->read_pos = pt->read_end; | |
754c9491 | 211 | |
3fe6190f GH |
212 | if (pt->write_pos > pt->read_end) |
213 | pt->write_pos = pt->read_end; | |
0f2d19dd JB |
214 | } |
215 | ||
0f2d19dd JB |
216 | SCM |
217 | scm_mkstrport (pos, str, modes, caller) | |
218 | SCM pos; | |
219 | SCM str; | |
220 | long modes; | |
3eeba8d4 | 221 | const char * caller; |
0f2d19dd JB |
222 | { |
223 | SCM z; | |
754c9491 JB |
224 | scm_port *pt; |
225 | int str_len; | |
226 | ||
227 | SCM_ASSERT (SCM_INUMP(pos) && SCM_INUM(pos) >= 0, pos, SCM_ARG1, caller); | |
228 | SCM_ASSERT (SCM_NIMP(str) && SCM_ROSTRINGP(str), str, SCM_ARG1, caller); | |
229 | str_len = SCM_ROLENGTH (str); | |
230 | if (SCM_INUM (pos) > str_len) | |
231 | scm_out_of_range (caller, pos); | |
232 | if (!((modes & SCM_WRTNG) || (modes & SCM_RDNG))) | |
233 | scm_misc_error ("scm_mkstrport", "port must read or write", SCM_EOL); | |
0f2d19dd JB |
234 | SCM_NEWCELL (z); |
235 | SCM_DEFER_INTS; | |
236 | pt = scm_add_to_port_table (z); | |
a6c64c3c | 237 | SCM_SETCAR (z, scm_tc16_strport | modes); |
0f2d19dd | 238 | SCM_SETPTAB_ENTRY (z, pt); |
754c9491 | 239 | SCM_SETSTREAM (z, str); |
ee149d03 | 240 | pt->write_buf = pt->read_buf = SCM_ROCHARS (str); |
754c9491 JB |
241 | pt->read_pos = pt->write_pos = pt->read_buf + SCM_INUM (pos); |
242 | pt->write_buf_size = pt->read_buf_size = str_len; | |
243 | pt->write_end = pt->read_end = pt->read_buf + pt->read_buf_size; | |
3fe6190f GH |
244 | |
245 | /* doesn't check (modes & SCM_RDNG), since the read_buf must be | |
246 | maintained even for output-only ports. */ | |
247 | pt->rw_random = modes & SCM_WRTNG; | |
248 | ||
0f2d19dd | 249 | SCM_ALLOW_INTS; |
3fe6190f GH |
250 | |
251 | /* ensure write_pos is writable. */ | |
754c9491 JB |
252 | if ((modes & SCM_WRTNG) && pt->write_pos == pt->write_end) |
253 | st_flush (z); | |
0f2d19dd JB |
254 | return z; |
255 | } | |
256 | ||
3fe6190f GH |
257 | /* create a new string from a string port's buffer. */ |
258 | SCM scm_strport_to_string (SCM port) | |
259 | { | |
260 | scm_port *pt = SCM_PTAB_ENTRY (port); | |
261 | ||
262 | if (pt->rw_active == SCM_PORT_WRITE) | |
263 | st_flush (port); | |
264 | return scm_makfromstr (SCM_CHARS (SCM_STREAM (port)), | |
265 | pt->read_buf_size, 0); | |
266 | } | |
267 | ||
0f2d19dd | 268 | SCM_PROC(s_call_with_output_string, "call-with-output-string", 1, 0, 0, scm_call_with_output_string); |
1cc91f1b | 269 | |
0f2d19dd JB |
270 | SCM |
271 | scm_call_with_output_string (proc) | |
272 | SCM proc; | |
0f2d19dd JB |
273 | { |
274 | SCM p; | |
754c9491 JB |
275 | |
276 | p = scm_mkstrport (SCM_INUM0, | |
277 | scm_make_string (SCM_INUM0, SCM_UNDEFINED), | |
278 | SCM_OPN | SCM_WRTNG, | |
279 | s_call_with_output_string); | |
0f2d19dd | 280 | scm_apply (proc, p, scm_listofnull); |
3fe6190f GH |
281 | |
282 | return scm_strport_to_string (p); | |
0f2d19dd JB |
283 | } |
284 | ||
285 | ||
286 | ||
287 | /* Return a Scheme string obtained by printing a given object. | |
288 | */ | |
289 | ||
1cc91f1b | 290 | |
0f2d19dd JB |
291 | SCM |
292 | scm_strprint_obj (obj) | |
293 | SCM obj; | |
0f2d19dd JB |
294 | { |
295 | SCM str; | |
296 | SCM port; | |
297 | ||
3fe6190f GH |
298 | str = scm_makstr (0, 0); |
299 | port = scm_mkstrport (SCM_INUM0, str, SCM_OPN | SCM_WRTNG, "scm_strprint_obj"); | |
87818069 | 300 | scm_prin1 (obj, port, 1); |
0f2d19dd | 301 | { |
3fe6190f | 302 | return scm_strport_to_string (port); |
0f2d19dd JB |
303 | } |
304 | } | |
305 | ||
306 | ||
307 | ||
308 | ||
309 | SCM_PROC(s_call_with_input_string, "call-with-input-string", 2, 0, 0, scm_call_with_input_string); | |
1cc91f1b | 310 | |
0f2d19dd JB |
311 | SCM |
312 | scm_call_with_input_string (str, proc) | |
313 | SCM str; | |
314 | SCM proc; | |
0f2d19dd JB |
315 | { |
316 | SCM p = scm_mkstrport(SCM_INUM0, str, SCM_OPN | SCM_RDNG, s_call_with_input_string); | |
317 | return scm_apply (proc, p, scm_listofnull); | |
318 | } | |
319 | ||
1cc91f1b | 320 | |
cd07a097 | 321 | |
a8aa30d8 MD |
322 | /* Given a null-terminated string EXPR containing a Scheme expression |
323 | read it, and return it as an SCM value. */ | |
324 | SCM | |
325 | scm_read_0str (expr) | |
326 | char *expr; | |
327 | { | |
3fe6190f | 328 | SCM port = scm_mkstrport (SCM_INUM0, |
a8aa30d8 MD |
329 | scm_makfrom0str (expr), |
330 | SCM_OPN | SCM_RDNG, | |
331 | "scm_eval_0str"); | |
332 | SCM form; | |
333 | ||
334 | /* Read expressions from that port; ignore the values. */ | |
deca31e1 | 335 | form = scm_read (port); |
a8aa30d8 MD |
336 | |
337 | scm_close_port (port); | |
338 | return form; | |
339 | } | |
340 | ||
cd07a097 | 341 | /* Given a null-terminated string EXPR containing Scheme program text, |
a8aa30d8 MD |
342 | evaluate it, and return the result of the last expression evaluated. */ |
343 | SCM | |
cd07a097 JB |
344 | scm_eval_0str (expr) |
345 | char *expr; | |
346 | { | |
b377f53e JB |
347 | return scm_eval_string (scm_makfrom0str (expr)); |
348 | } | |
349 | ||
350 | ||
351 | SCM_PROC (s_eval_string, "eval-string", 1, 0, 0, scm_eval_string); | |
352 | ||
353 | SCM | |
354 | scm_eval_string (string) | |
355 | SCM string; | |
356 | { | |
3fe6190f | 357 | SCM port = scm_mkstrport (SCM_INUM0, string, SCM_OPN | SCM_RDNG, |
cd07a097 JB |
358 | "scm_eval_0str"); |
359 | SCM form; | |
b377f53e | 360 | SCM ans = SCM_UNSPECIFIED; |
cd07a097 JB |
361 | |
362 | /* Read expressions from that port; ignore the values. */ | |
0c32d76c | 363 | while (!SCM_EOF_OBJECT_P (form = scm_read (port))) |
a8aa30d8 | 364 | ans = scm_eval_x (form); |
cd07a097 | 365 | |
0d7368d7 JB |
366 | /* Don't close the port here; if we re-enter this function via a |
367 | continuation, then the next time we enter it, we'll get an error. | |
368 | It's a string port anyway, so there's no advantage to closing it | |
369 | early. */ | |
370 | ||
a8aa30d8 | 371 | return ans; |
cd07a097 JB |
372 | } |
373 | ||
0b6881fa | 374 | void scm_make_stptob (void); /* Called from ports.c */ |
cd07a097 | 375 | |
0b6881fa MD |
376 | void |
377 | scm_make_stptob () | |
0f2d19dd | 378 | { |
affc96b5 | 379 | long tc = scm_make_port_type ("string", stfill_buffer, st_write); |
6c747373 | 380 | scm_set_port_mark (tc, scm_markstream); |
affc96b5 GH |
381 | scm_set_port_end_input (tc, st_end_input); |
382 | scm_set_port_flush (tc, st_flush); | |
6c747373 | 383 | scm_set_port_seek (tc, st_seek); |
affc96b5 | 384 | scm_set_port_truncate (tc, st_truncate); |
0f2d19dd JB |
385 | } |
386 | ||
0f2d19dd JB |
387 | void |
388 | scm_init_strports () | |
0f2d19dd JB |
389 | { |
390 | #include "strports.x" | |
391 | } | |
392 |