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0f2d19dd JB |
1 | /* Copyright (C) 1995,1996 Free Software Foundation, Inc. |
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 | |
15 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
16 | * | |
17 | * As a special exception, the Free Software Foundation gives permission | |
18 | * for additional uses of the text contained in its release of GUILE. | |
19 | * | |
20 | * The exception is that, if you link the GUILE library with other files | |
21 | * to produce an executable, this does not by itself cause the | |
22 | * resulting executable to be covered by the GNU General Public License. | |
23 | * Your use of that executable is in no way restricted on account of | |
24 | * linking the GUILE library code into it. | |
25 | * | |
26 | * This exception does not however invalidate any other reasons why | |
27 | * the executable file might be covered by the GNU General Public License. | |
28 | * | |
29 | * This exception applies only to the code released by the | |
30 | * Free Software Foundation under the name GUILE. If you copy | |
31 | * code from other Free Software Foundation releases into a copy of | |
32 | * GUILE, as the General Public License permits, the exception does | |
33 | * not apply to the code that you add in this way. To avoid misleading | |
34 | * anyone as to the status of such modified files, you must delete | |
35 | * this exception notice from them. | |
36 | * | |
37 | * If you write modifications of your own for GUILE, it is your choice | |
38 | * whether to permit this exception to apply to your modifications. | |
39 | * If you do not wish that, delete this exception notice. | |
40 | */ | |
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" | |
49 | ||
50 | #include "load.h" | |
06721500 JB |
51 | |
52 | #include <sys/types.h> | |
53 | #include <sys/stat.h> | |
54 | ||
55 | #ifdef HAVE_UNISTD_H | |
56 | #include <unistd.h> | |
57 | #endif /* HAVE_UNISTD_H */ | |
58 | ||
59 | #ifndef R_OK | |
60 | #define R_OK 4 | |
61 | #endif | |
0f2d19dd JB |
62 | |
63 | \f | |
06721500 | 64 | /* Loading a file, given an absolute filename. */ |
0f2d19dd | 65 | |
26544b96 JB |
66 | /* Hook to run when we load a file, perhaps to announce the fact somewhere. |
67 | Applied to the full name of the file. */ | |
68 | static SCM *scm_loc_load_hook; | |
69 | ||
523f5266 | 70 | SCM_PROC(s_primitive_load, "primitive-load", 1, 2, 0, scm_primitive_load); |
0f2d19dd | 71 | SCM |
b9d5d654 | 72 | scm_primitive_load (filename, case_insensitive_p, sharp) |
0f2d19dd | 73 | SCM filename; |
06721500 | 74 | SCM case_insensitive_p; |
0f2d19dd | 75 | SCM sharp; |
0f2d19dd | 76 | { |
26544b96 | 77 | SCM hook = *scm_loc_load_hook; |
06721500 | 78 | SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename, |
523f5266 | 79 | SCM_ARG1, s_primitive_load); |
26544b96 JB |
80 | SCM_ASSERT (hook == SCM_BOOL_F |
81 | || (scm_procedure_p (hook) == SCM_BOOL_T), | |
82 | hook, "value of %load-hook is neither a procedure nor #f", | |
83 | s_primitive_load); | |
84 | ||
85 | if (hook != SCM_BOOL_F) | |
86 | scm_apply (hook, scm_listify (filename, SCM_UNDEFINED), SCM_EOL); | |
87 | ||
0f2d19dd JB |
88 | { |
89 | SCM form, port; | |
90 | port = scm_open_file (filename, | |
91 | scm_makfromstr ("r", (scm_sizet) sizeof (char), 0)); | |
0f2d19dd JB |
92 | while (1) |
93 | { | |
06721500 | 94 | form = scm_read (port, case_insensitive_p, sharp); |
0f2d19dd JB |
95 | if (SCM_EOF_VAL == form) |
96 | break; | |
97 | scm_eval_x (form); | |
98 | } | |
99 | scm_close_port (port); | |
100 | } | |
b59b97ba | 101 | return SCM_UNSPECIFIED; |
0f2d19dd JB |
102 | } |
103 | ||
104 | \f | |
06721500 | 105 | /* Initializing the load path, and searching it. */ |
0f2d19dd | 106 | |
26544b96 | 107 | /* List of names of directories we search for files to load. */ |
06721500 JB |
108 | static SCM *scm_loc_load_path; |
109 | ||
26544b96 JB |
110 | /* List of extensions we try adding to the filenames. */ |
111 | static SCM *scm_loc_load_extensions; | |
112 | ||
06721500 JB |
113 | /* Initialize the global variable %load-path, given the value of the |
114 | LIBRARY_PATH preprocessor symbol and the SCHEME_LOAD_PATH | |
115 | environment variable. */ | |
0f2d19dd | 116 | void |
06721500 JB |
117 | scm_init_load_path () |
118 | { | |
119 | SCM path = SCM_EOL; | |
120 | ||
121 | #ifdef LIBRARY_PATH | |
122 | path = scm_cons (scm_makfrom0str (LIBRARY_PATH), path); | |
123 | #endif /* LIBRARY_PATH */ | |
124 | ||
125 | { | |
126 | char *path_string = getenv ("SCHEME_LOAD_PATH"); | |
127 | ||
128 | if (path_string && path_string[0] != '\0') | |
129 | { | |
130 | char *scan, *elt_end; | |
131 | ||
132 | /* Scan backwards from the end of the string, to help | |
133 | construct the list in the right order. */ | |
134 | scan = elt_end = path_string + strlen (path_string); | |
135 | do { | |
136 | /* Scan back to the beginning of the current element. */ | |
137 | do scan--; | |
138 | while (scan >= path_string && *scan != ':'); | |
139 | path = scm_cons (scm_makfromstr (scan + 1, elt_end - (scan + 1), 0), | |
140 | path); | |
141 | elt_end = scan; | |
142 | } while (scan >= path_string); | |
143 | } | |
144 | } | |
145 | ||
146 | *scm_loc_load_path = path; | |
147 | } | |
148 | ||
149 | ||
150 | /* Search %load-path for a directory containing a file named FILENAME. | |
151 | The file must be readable, and not a directory. | |
26544b96 JB |
152 | If we find one, return its full filename; otherwise, return #f. |
153 | If FILENAME is absolute, return it unchanged. */ | |
06721500 JB |
154 | SCM_PROC(s_sys_search_load_path, "%search-load-path", 1, 0, 0, scm_sys_search_load_path); |
155 | SCM | |
156 | scm_sys_search_load_path (filename) | |
157 | SCM filename; | |
158 | { | |
159 | SCM path = *scm_loc_load_path; | |
26544b96 | 160 | SCM exts = *scm_loc_load_extensions; |
06721500 | 161 | char *buf; |
06721500 | 162 | int filename_len; |
26544b96 JB |
163 | int max_path_len; |
164 | int max_ext_len; | |
06721500 JB |
165 | |
166 | SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename, | |
167 | SCM_ARG1, s_sys_search_load_path); | |
26544b96 JB |
168 | SCM_ASSERT (scm_ilength (path) >= 0, path, "load path is not a proper list", |
169 | s_sys_search_load_path); | |
170 | SCM_ASSERT (scm_ilength (exts) >= 0, exts, | |
171 | "load extension list is not a proper list", | |
172 | s_sys_search_load_path); | |
06721500 JB |
173 | filename_len = SCM_ROLENGTH (filename); |
174 | ||
26544b96 JB |
175 | /* If FILENAME is absolute, return it unchanged. */ |
176 | if (filename_len >= 1 | |
177 | && SCM_ROCHARS (filename)[0] == '/') | |
178 | return filename; | |
179 | ||
180 | /* Find the length of the longest element of path. */ | |
181 | { | |
182 | SCM walk; | |
183 | ||
184 | max_path_len = 0; | |
185 | for (walk = path; SCM_NIMP (walk); walk = SCM_CDR (walk)) | |
186 | { | |
187 | SCM elt = SCM_CAR (walk); | |
188 | SCM_ASSERT (SCM_NIMP (elt) && SCM_ROSTRINGP (elt), elt, | |
189 | "load path is not a list of strings", | |
190 | s_sys_search_load_path); | |
191 | if (SCM_LENGTH (elt) > max_path_len) | |
192 | max_path_len = SCM_LENGTH (elt); | |
193 | } | |
194 | } | |
195 | ||
196 | /* Find the length of the longest element of the load extensions | |
197 | list. */ | |
198 | { | |
199 | SCM walk; | |
200 | ||
201 | max_ext_len = 0; | |
202 | for (walk = exts; SCM_NIMP (walk); walk = SCM_CDR (walk)) | |
203 | { | |
204 | SCM elt = SCM_CAR (walk); | |
205 | SCM_ASSERT (SCM_NIMP (elt) && SCM_ROSTRINGP (elt), elt, | |
206 | "load extension list is not a list of strings", | |
207 | s_sys_search_load_path); | |
208 | if (SCM_LENGTH (elt) > max_ext_len) | |
209 | max_ext_len = SCM_LENGTH (elt); | |
210 | } | |
211 | } | |
212 | ||
06721500 JB |
213 | SCM_DEFER_INTS; |
214 | ||
26544b96 JB |
215 | buf = scm_must_malloc (max_path_len + 1 + filename_len + max_ext_len + 1, |
216 | s_sys_search_load_path); | |
06721500 | 217 | |
26544b96 JB |
218 | /* Try every path element. At this point, we know it's a proper |
219 | list of strings. */ | |
220 | for (; SCM_NIMP (path); path = SCM_CDR (path)) | |
06721500 | 221 | { |
26544b96 JB |
222 | SCM path_elt = SCM_CAR (path); |
223 | ||
224 | /* Try every extension. At this point, we know it's a proper | |
225 | list of strings. */ | |
226 | for (exts = *scm_loc_load_extensions; | |
227 | SCM_NIMP (exts); | |
228 | exts = SCM_CDR (exts)) | |
06721500 | 229 | { |
26544b96 JB |
230 | SCM ext_elt = SCM_CAR (exts); |
231 | int i; | |
232 | ||
233 | /* Concatenate the path name, the filename, and the extension. */ | |
234 | i = SCM_ROLENGTH (path_elt); | |
235 | memcpy (buf, SCM_ROCHARS (path_elt), i); | |
236 | buf[i++] = '/'; | |
237 | memcpy (buf + i, SCM_ROCHARS (filename), filename_len); | |
238 | i += filename_len; | |
239 | memcpy (buf + i, SCM_ROCHARS (ext_elt), SCM_LENGTH (ext_elt)); | |
240 | i += SCM_LENGTH (ext_elt); | |
241 | buf[i] = '\0'; | |
06721500 JB |
242 | |
243 | { | |
244 | struct stat mode; | |
245 | ||
246 | if (stat (buf, &mode) >= 0 | |
247 | && ! (mode.st_mode & S_IFDIR) | |
248 | && access (buf, R_OK) == 0) | |
249 | { | |
26544b96 | 250 | SCM result = scm_makfromstr (buf, i, 0); |
06721500 JB |
251 | scm_must_free (buf); |
252 | SCM_ALLOW_INTS; | |
253 | return result; | |
254 | } | |
255 | } | |
256 | } | |
06721500 JB |
257 | } |
258 | ||
259 | scm_must_free (buf); | |
260 | SCM_ALLOW_INTS; | |
261 | return SCM_BOOL_F; | |
262 | } | |
263 | ||
264 | ||
26544b96 | 265 | SCM_PROC(s_primitive_load_path, "primitive-load-path", 1, 2, 0, scm_primitive_load_path); |
06721500 | 266 | SCM |
b9d5d654 | 267 | scm_primitive_load_path (filename, case_insensitive_p, sharp) |
06721500 JB |
268 | SCM filename; |
269 | SCM case_insensitive_p; | |
270 | SCM sharp; | |
271 | { | |
26544b96 JB |
272 | SCM full_filename; |
273 | ||
274 | SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename, | |
275 | SCM_ARG1, s_primitive_load_path); | |
276 | ||
277 | full_filename = scm_sys_search_load_path (filename); | |
278 | ||
dbece3a2 GH |
279 | if (SCM_FALSEP (full_filename)) |
280 | { | |
26544b96 JB |
281 | int absolute = (SCM_LENGTH (filename) >= 1 |
282 | && SCM_ROCHARS (filename)[0] == '/'); | |
523f5266 | 283 | scm_misc_error (s_primitive_load_path, |
26544b96 JB |
284 | (absolute |
285 | ? "Unable to load file %S" | |
286 | : "Unable to find file %S in load path"), | |
287 | scm_listify (filename, SCM_UNDEFINED)); | |
dbece3a2 | 288 | } |
26544b96 | 289 | |
b9d5d654 | 290 | return scm_primitive_load (full_filename, case_insensitive_p, sharp); |
06721500 JB |
291 | } |
292 | ||
293 | \f | |
294 | ||
0f2d19dd JB |
295 | void |
296 | scm_init_load () | |
0f2d19dd | 297 | { |
25d8012c | 298 | scm_loc_load_path = SCM_CDRLOC(scm_sysintern("%load-path", SCM_EOL)); |
26544b96 JB |
299 | scm_loc_load_extensions |
300 | = SCM_CDRLOC(scm_sysintern("%load-extensions", | |
301 | scm_listify (scm_makfrom0str (""), | |
302 | scm_makfrom0str (".scm"), | |
303 | SCM_UNDEFINED))); | |
304 | scm_loc_load_hook = SCM_CDRLOC(scm_sysintern("%load-hook", SCM_BOOL_F)); | |
06721500 | 305 | |
0f2d19dd JB |
306 | #include "load.x" |
307 | } |