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af04791a | 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" | |
06721500 | 45 | #include "libpath.h" |
20e6290e JB |
46 | #include "fports.h" |
47 | #include "read.h" | |
48 | #include "eval.h" | |
b35d06a4 | 49 | #include "throw.h" |
e151bee6 | 50 | #include "alist.h" |
d7834b91 | 51 | #include "dynwind.h" |
20e6290e JB |
52 | |
53 | #include "load.h" | |
06721500 JB |
54 | |
55 | #include <sys/types.h> | |
56 | #include <sys/stat.h> | |
57 | ||
58 | #ifdef HAVE_UNISTD_H | |
59 | #include <unistd.h> | |
60 | #endif /* HAVE_UNISTD_H */ | |
61 | ||
62 | #ifndef R_OK | |
63 | #define R_OK 4 | |
64 | #endif | |
0f2d19dd JB |
65 | |
66 | \f | |
06721500 | 67 | /* Loading a file, given an absolute filename. */ |
0f2d19dd | 68 | |
26544b96 JB |
69 | /* Hook to run when we load a file, perhaps to announce the fact somewhere. |
70 | Applied to the full name of the file. */ | |
71 | static SCM *scm_loc_load_hook; | |
72 | ||
c7023c69 | 73 | static void |
d7834b91 MD |
74 | swap_port (void *data) |
75 | { | |
76 | SCM *save_port = data, tmp = scm_cur_loadp; | |
77 | scm_cur_loadp = *save_port; | |
78 | *save_port = tmp; | |
79 | } | |
80 | ||
81 | static SCM | |
82 | load (void *data) | |
83 | { | |
84 | SCM port = (SCM) data, form; | |
85 | while (1) | |
86 | { | |
87 | form = scm_read (port); | |
88 | if (SCM_EOF_OBJECT_P (form)) | |
89 | break; | |
90 | scm_eval_x (form); | |
91 | } | |
92 | return SCM_UNSPECIFIED; | |
93 | } | |
94 | ||
deca31e1 | 95 | SCM_PROC(s_primitive_load, "primitive-load", 1, 0, 0, scm_primitive_load); |
0f2d19dd | 96 | SCM |
deca31e1 | 97 | scm_primitive_load (filename) |
0f2d19dd | 98 | SCM filename; |
0f2d19dd | 99 | { |
26544b96 | 100 | SCM hook = *scm_loc_load_hook; |
06721500 | 101 | SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename, |
523f5266 | 102 | SCM_ARG1, s_primitive_load); |
26544b96 JB |
103 | SCM_ASSERT (hook == SCM_BOOL_F |
104 | || (scm_procedure_p (hook) == SCM_BOOL_T), | |
105 | hook, "value of %load-hook is neither a procedure nor #f", | |
106 | s_primitive_load); | |
107 | ||
108 | if (hook != SCM_BOOL_F) | |
109 | scm_apply (hook, scm_listify (filename, SCM_UNDEFINED), SCM_EOL); | |
110 | ||
0f2d19dd | 111 | { |
d7834b91 | 112 | SCM port, save_port; |
0f2d19dd JB |
113 | port = scm_open_file (filename, |
114 | scm_makfromstr ("r", (scm_sizet) sizeof (char), 0)); | |
d7834b91 MD |
115 | save_port = port; |
116 | scm_internal_dynamic_wind (swap_port, | |
117 | load, | |
118 | swap_port, | |
119 | (void *) port, | |
120 | &save_port); | |
0f2d19dd JB |
121 | scm_close_port (port); |
122 | } | |
b59b97ba | 123 | return SCM_UNSPECIFIED; |
0f2d19dd JB |
124 | } |
125 | ||
126 | \f | |
3feedb00 MD |
127 | /* Builtin path to scheme library files. */ |
128 | #ifdef SCM_PKGDATA_DIR | |
129 | SCM_PROC (s_sys_package_data_dir, "%package-data-dir", 0, 0, 0, scm_sys_package_data_dir); | |
130 | SCM | |
131 | scm_sys_package_data_dir () | |
132 | { | |
133 | return scm_makfrom0str (SCM_PKGDATA_DIR); | |
134 | } | |
135 | #endif /* SCM_PKGDATA_DIR */ | |
136 | ||
137 | \f | |
06721500 | 138 | /* Initializing the load path, and searching it. */ |
0f2d19dd | 139 | |
26544b96 | 140 | /* List of names of directories we search for files to load. */ |
06721500 JB |
141 | static SCM *scm_loc_load_path; |
142 | ||
26544b96 JB |
143 | /* List of extensions we try adding to the filenames. */ |
144 | static SCM *scm_loc_load_extensions; | |
145 | ||
01cddfc1 JB |
146 | |
147 | /* Parse the null-terminated string PATH as if it were a standard path | |
148 | environment variable (i.e. a colon-separated list of strings), and | |
149 | prepend the elements to TAIL. */ | |
150 | SCM | |
04e8fb0a | 151 | scm_internal_parse_path (char *path, SCM tail) |
01cddfc1 JB |
152 | { |
153 | if (path && path[0] != '\0') | |
154 | { | |
155 | char *scan, *elt_end; | |
156 | ||
157 | /* Scan backwards from the end of the string, to help | |
158 | construct the list in the right order. */ | |
159 | scan = elt_end = path + strlen (path); | |
160 | do { | |
161 | /* Scan back to the beginning of the current element. */ | |
162 | do scan--; | |
163 | while (scan >= path && *scan != ':'); | |
164 | tail = scm_cons (scm_makfromstr (scan + 1, elt_end - (scan + 1), 0), | |
165 | tail); | |
166 | elt_end = scan; | |
167 | } while (scan >= path); | |
168 | } | |
169 | ||
170 | return tail; | |
171 | } | |
172 | ||
173 | ||
04e8fb0a MD |
174 | SCM_PROC (s_parse_path, "parse-path", 1, 1, 0, scm_parse_path); |
175 | ||
176 | SCM | |
177 | scm_parse_path (SCM path, SCM tail) | |
178 | { | |
179 | SCM_ASSERT (SCM_FALSEP (path) || (SCM_NIMP (path) && SCM_ROSTRINGP (path)), | |
180 | path, | |
181 | SCM_ARG1, | |
182 | s_parse_path); | |
183 | if (SCM_UNBNDP (tail)) | |
184 | tail = SCM_EOL; | |
185 | return (SCM_FALSEP (path) | |
186 | ? tail | |
187 | : scm_internal_parse_path (SCM_ROCHARS (path), tail)); | |
188 | } | |
189 | ||
190 | ||
06721500 | 191 | /* Initialize the global variable %load-path, given the value of the |
3feedb00 | 192 | SCM_SITE_DIR and SCM_LIBRARY_DIR preprocessor symbols and the |
01cddfc1 | 193 | GUILE_LOAD_PATH environment variable. */ |
0f2d19dd | 194 | void |
06721500 JB |
195 | scm_init_load_path () |
196 | { | |
197 | SCM path = SCM_EOL; | |
198 | ||
3feedb00 | 199 | #ifdef SCM_LIBRARY_DIR |
55407879 TP |
200 | path = scm_listify (scm_makfrom0str (SCM_SITE_DIR), |
201 | scm_makfrom0str (SCM_LIBRARY_DIR), | |
202 | scm_makfrom0str (SCM_PKGDATA_DIR), | |
203 | SCM_UNDEFINED); | |
3feedb00 | 204 | #endif /* SCM_LIBRARY_DIR */ |
06721500 | 205 | |
04e8fb0a | 206 | path = scm_internal_parse_path (getenv ("GUILE_LOAD_PATH"), path); |
01cddfc1 | 207 | |
06721500 JB |
208 | *scm_loc_load_path = path; |
209 | } | |
210 | ||
04e8fb0a | 211 | SCM scm_listofnullstr; |
06721500 | 212 | |
04e8fb0a | 213 | /* Search PATH for a directory containing a file named FILENAME. |
06721500 | 214 | The file must be readable, and not a directory. |
26544b96 | 215 | If we find one, return its full filename; otherwise, return #f. |
56384176 JB |
216 | If FILENAME is absolute, return it unchanged. |
217 | If given, EXTENSIONS is a list of strings; for each directory | |
218 | in PATH, we search for FILENAME concatenated with each EXTENSION. */ | |
04e8fb0a | 219 | SCM_PROC(s_search_path, "search-path", 2, 1, 0, scm_search_path); |
06721500 | 220 | SCM |
04e8fb0a MD |
221 | scm_search_path (path, filename, extensions) |
222 | SCM path; | |
06721500 | 223 | SCM filename; |
04e8fb0a | 224 | SCM extensions; |
06721500 | 225 | { |
56384176 | 226 | char *filename_chars; |
06721500 | 227 | int filename_len; |
56384176 JB |
228 | size_t max_path_len; /* maximum length of any PATH element */ |
229 | size_t max_ext_len; /* maximum length of any EXTENSIONS element */ | |
06721500 | 230 | |
04e8fb0a | 231 | SCM_ASSERT (scm_ilength (path) >= 0, path, SCM_ARG1, s_search_path); |
06721500 | 232 | SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename, |
04e8fb0a MD |
233 | SCM_ARG2, s_search_path); |
234 | if (SCM_UNBNDP (extensions)) | |
56384176 | 235 | extensions = SCM_EOL; |
04e8fb0a MD |
236 | else |
237 | SCM_ASSERT (scm_ilength (extensions) >= 0, extensions, | |
238 | SCM_ARG3, s_search_path); | |
56384176 JB |
239 | |
240 | filename_chars = SCM_ROCHARS (filename); | |
06721500 JB |
241 | filename_len = SCM_ROLENGTH (filename); |
242 | ||
26544b96 | 243 | /* If FILENAME is absolute, return it unchanged. */ |
56384176 | 244 | if (filename_len >= 1 && filename_chars[0] == '/') |
26544b96 JB |
245 | return filename; |
246 | ||
247 | /* Find the length of the longest element of path. */ | |
248 | { | |
249 | SCM walk; | |
250 | ||
251 | max_path_len = 0; | |
252 | for (walk = path; SCM_NIMP (walk); walk = SCM_CDR (walk)) | |
253 | { | |
254 | SCM elt = SCM_CAR (walk); | |
255 | SCM_ASSERT (SCM_NIMP (elt) && SCM_ROSTRINGP (elt), elt, | |
04e8fb0a MD |
256 | "path is not a list of strings", |
257 | s_search_path); | |
0a74e31d MD |
258 | if (SCM_ROLENGTH (elt) > max_path_len) |
259 | max_path_len = SCM_ROLENGTH (elt); | |
26544b96 JB |
260 | } |
261 | } | |
262 | ||
56384176 JB |
263 | /* If FILENAME has an extension, don't try to add EXTENSIONS to it. */ |
264 | { | |
265 | char *endp; | |
266 | ||
267 | for (endp = filename_chars + filename_len - 1; | |
268 | endp >= filename_chars; | |
269 | endp--) | |
270 | { | |
271 | if (*endp == '.') | |
272 | { | |
273 | /* This filename already has an extension, so cancel the | |
274 | list of extensions. */ | |
275 | extensions = SCM_EOL; | |
276 | break; | |
277 | } | |
278 | else if (*endp == '/') | |
279 | /* This filename has no extension, so keep the current list | |
280 | of extensions. */ | |
281 | break; | |
282 | } | |
283 | } | |
284 | ||
26544b96 JB |
285 | /* Find the length of the longest element of the load extensions |
286 | list. */ | |
287 | { | |
288 | SCM walk; | |
289 | ||
290 | max_ext_len = 0; | |
04e8fb0a | 291 | for (walk = extensions; SCM_NIMP (walk); walk = SCM_CDR (walk)) |
26544b96 JB |
292 | { |
293 | SCM elt = SCM_CAR (walk); | |
294 | SCM_ASSERT (SCM_NIMP (elt) && SCM_ROSTRINGP (elt), elt, | |
04e8fb0a MD |
295 | "extension list is not a list of strings", |
296 | s_search_path); | |
0a74e31d MD |
297 | if (SCM_ROLENGTH (elt) > max_ext_len) |
298 | max_ext_len = SCM_ROLENGTH (elt); | |
26544b96 JB |
299 | } |
300 | } | |
301 | ||
06721500 JB |
302 | SCM_DEFER_INTS; |
303 | ||
56384176 JB |
304 | { |
305 | SCM result = SCM_BOOL_F; | |
306 | int buf_size = max_path_len + 1 + filename_len + max_ext_len + 1; | |
307 | char *buf = scm_must_malloc (buf_size, s_search_path); | |
06721500 | 308 | |
56384176 JB |
309 | /* This simplifies the loop below a bit. */ |
310 | if (SCM_NULLP (extensions)) | |
311 | extensions = scm_listofnullstr; | |
0a74e31d | 312 | |
56384176 JB |
313 | /* Try every path element. At this point, we know the path is a |
314 | proper list of strings. */ | |
315 | for (; SCM_NIMP (path); path = SCM_CDR (path)) | |
316 | { | |
317 | int len; | |
318 | SCM dir = SCM_CAR (path); | |
319 | SCM exts; | |
320 | ||
321 | /* Concatenate the path name and the filename. */ | |
322 | len = SCM_ROLENGTH (dir); | |
323 | memcpy (buf, SCM_ROCHARS (dir), len); | |
324 | if (len >= 1 && buf[len - 1] != '/') | |
325 | buf[len++] = '/'; | |
326 | memcpy (buf + len, filename_chars, filename_len); | |
327 | len += filename_len; | |
328 | ||
329 | /* Try every extension. At this point, we know the extension | |
330 | list is a proper, nonempty list of strings. */ | |
331 | for (exts = extensions; SCM_NIMP (exts); exts = SCM_CDR (exts)) | |
332 | { | |
333 | SCM ext = SCM_CAR (exts); | |
334 | int ext_len = SCM_ROLENGTH (ext); | |
335 | struct stat mode; | |
336 | ||
337 | /* Concatenate the extension. */ | |
338 | memcpy (buf + len, SCM_ROCHARS (ext), ext_len); | |
339 | buf[len + ext_len] = '\0'; | |
340 | ||
341 | /* If the file exists at all, we should return it. If the | |
342 | file is inaccessible, then that's an error. */ | |
343 | if (stat (buf, &mode) == 0 | |
344 | && ! (mode.st_mode & S_IFDIR)) | |
345 | { | |
346 | result = scm_makfromstr (buf, len + ext_len, 0); | |
347 | goto end; | |
348 | } | |
349 | } | |
350 | } | |
351 | ||
352 | end: | |
353 | scm_must_free (buf); | |
354 | scm_done_malloc (- buf_size); | |
355 | SCM_ALLOW_INTS; | |
356 | return result; | |
357 | } | |
06721500 JB |
358 | } |
359 | ||
360 | ||
04e8fb0a MD |
361 | /* Search %load-path for a directory containing a file named FILENAME. |
362 | The file must be readable, and not a directory. | |
363 | If we find one, return its full filename; otherwise, return #f. | |
364 | If FILENAME is absolute, return it unchanged. */ | |
365 | SCM_PROC(s_sys_search_load_path, "%search-load-path", 1, 0, 0, scm_sys_search_load_path); | |
366 | SCM | |
367 | scm_sys_search_load_path (filename) | |
368 | SCM filename; | |
369 | { | |
370 | SCM path = *scm_loc_load_path; | |
371 | SCM exts = *scm_loc_load_extensions; | |
372 | SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename, | |
373 | SCM_ARG1, s_sys_search_load_path); | |
374 | SCM_ASSERT (scm_ilength (path) >= 0, path, "load path is not a proper list", | |
375 | s_sys_search_load_path); | |
376 | SCM_ASSERT (scm_ilength (exts) >= 0, exts, | |
377 | "load extension list is not a proper list", | |
378 | s_sys_search_load_path); | |
379 | return scm_search_path (path, | |
380 | filename, | |
381 | exts); | |
382 | } | |
383 | ||
384 | ||
deca31e1 | 385 | SCM_PROC(s_primitive_load_path, "primitive-load-path", 1, 0, 0, scm_primitive_load_path); |
06721500 | 386 | SCM |
deca31e1 | 387 | scm_primitive_load_path (filename) |
06721500 | 388 | SCM filename; |
06721500 | 389 | { |
26544b96 JB |
390 | SCM full_filename; |
391 | ||
392 | SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename, | |
393 | SCM_ARG1, s_primitive_load_path); | |
394 | ||
395 | full_filename = scm_sys_search_load_path (filename); | |
396 | ||
dbece3a2 GH |
397 | if (SCM_FALSEP (full_filename)) |
398 | { | |
0a74e31d | 399 | int absolute = (SCM_ROLENGTH (filename) >= 1 |
26544b96 | 400 | && SCM_ROCHARS (filename)[0] == '/'); |
523f5266 | 401 | scm_misc_error (s_primitive_load_path, |
26544b96 JB |
402 | (absolute |
403 | ? "Unable to load file %S" | |
404 | : "Unable to find file %S in load path"), | |
405 | scm_listify (filename, SCM_UNDEFINED)); | |
dbece3a2 | 406 | } |
26544b96 | 407 | |
deca31e1 | 408 | return scm_primitive_load (full_filename); |
06721500 JB |
409 | } |
410 | ||
b35d06a4 MD |
411 | /* The following function seems trivial - and indeed it is. Its |
412 | * existence is motivated by its ability to evaluate expressions | |
413 | * without copying them first (as is done in "eval"). | |
414 | */ | |
415 | ||
416 | SCM_SYMBOL (scm_end_of_file_key, "end-of-file"); | |
417 | ||
deca31e1 | 418 | SCM_PROC (s_read_and_eval_x, "read-and-eval!", 0, 1, 0, scm_read_and_eval_x); |
b35d06a4 MD |
419 | |
420 | SCM | |
deca31e1 | 421 | scm_read_and_eval_x (port) |
b35d06a4 | 422 | SCM port; |
b35d06a4 | 423 | { |
deca31e1 | 424 | SCM form = scm_read (port); |
0c32d76c | 425 | if (SCM_EOF_OBJECT_P (form)) |
b35d06a4 MD |
426 | scm_ithrow (scm_end_of_file_key, SCM_EOL, 1); |
427 | return scm_eval_x (form); | |
428 | } | |
429 | ||
06721500 | 430 | \f |
e151bee6 | 431 | /* Information about the build environment. */ |
06721500 | 432 | |
e151bee6 JB |
433 | /* Initialize the scheme variable %guile-build-info, based on data |
434 | provided by the Makefile, via libpath.h. */ | |
435 | static void | |
436 | init_build_info () | |
437 | { | |
438 | static struct { char *name; char *value; } info[] = SCM_BUILD_INFO; | |
439 | SCM *loc = SCM_CDRLOC (scm_sysintern ("%guile-build-info", SCM_EOL)); | |
c7023c69 | 440 | unsigned int i; |
e151bee6 JB |
441 | |
442 | for (i = 0; i < (sizeof (info) / sizeof (info[0])); i++) | |
443 | *loc = scm_acons (SCM_CAR (scm_intern0 (info[i].name)), | |
444 | scm_makfrom0str (info[i].value), | |
445 | *loc); | |
446 | } | |
447 | ||
448 | ||
449 | \f | |
0f2d19dd JB |
450 | void |
451 | scm_init_load () | |
0f2d19dd | 452 | { |
04e8fb0a MD |
453 | scm_listofnullstr = scm_permanent_object (SCM_LIST1 (scm_nullstr)); |
454 | scm_loc_load_path = SCM_CDRLOC (scm_sysintern ("%load-path", SCM_EOL)); | |
26544b96 | 455 | scm_loc_load_extensions |
04e8fb0a | 456 | = SCM_CDRLOC (scm_sysintern ("%load-extensions", |
0a74e31d MD |
457 | scm_listify (scm_makfrom0str (".scm"), |
458 | scm_makfrom0str (""), | |
04e8fb0a MD |
459 | SCM_UNDEFINED))); |
460 | scm_loc_load_hook = SCM_CDRLOC (scm_sysintern ("%load-hook", SCM_BOOL_F)); | |
06721500 | 461 | |
e151bee6 JB |
462 | init_build_info (); |
463 | ||
0f2d19dd JB |
464 | #include "load.x" |
465 | } |