1 /* Copyright (C) 1995,1996,1998,1999,2000,2001 Free Software Foundation, Inc.
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)
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.
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, Inc., 59 Temple Place, Suite 330,
16 * Boston, MA 02111-1307 USA
18 * As a special exception, the Free Software Foundation gives permission
19 * for additional uses of the text contained in its release of GUILE.
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.
27 * This exception does not however invalidate any other reasons why
28 * the executable file might be covered by the GNU General Public License.
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.
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.
40 * If you do not wish that, delete this exception notice. */
42 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
43 gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
49 #include "libguile/_scm.h"
50 #include "libguile/libpath.h"
51 #include "libguile/fports.h"
52 #include "libguile/read.h"
53 #include "libguile/eval.h"
54 #include "libguile/throw.h"
55 #include "libguile/alist.h"
56 #include "libguile/dynwind.h"
57 #include "libguile/root.h"
58 #include "libguile/strings.h"
59 #include "libguile/modules.h"
61 #include "libguile/validate.h"
62 #include "libguile/load.h"
64 #include <sys/types.h>
69 #endif /* HAVE_UNISTD_H */
76 /* Loading a file, given an absolute filename. */
78 /* Hook to run when we load a file, perhaps to announce the fact somewhere.
79 Applied to the full name of the file. */
80 static SCM
*scm_loc_load_hook
;
83 swap_port (void *data
)
85 SCM
*save_port
= data
, tmp
= scm_cur_loadp
;
86 scm_cur_loadp
= *save_port
;
93 SCM port
= SCM_PACK (data
);
96 SCM form
= scm_read (port
);
97 if (SCM_EOF_OBJECT_P (form
))
99 scm_primitive_eval_x (form
);
101 return SCM_UNSPECIFIED
;
104 SCM_DEFINE (scm_primitive_load
, "primitive-load", 1, 0, 0,
106 "Load the file named @var{filename} and evaluate its contents in\n"
107 "the top-level environment. The load paths are not searched;\n"
108 "@var{filename} must either be a full pathname or be a pathname\n"
109 "relative to the current directory. If the variable\n"
110 "@code{%load-hook} is defined, it should be bound to a procedure\n"
111 "that will be called before any code is loaded. See the\n"
112 "documentation for @code{%load-hook} later in this section.")
113 #define FUNC_NAME s_scm_primitive_load
115 SCM hook
= *scm_loc_load_hook
;
116 SCM_VALIDATE_STRING (1, filename
);
117 if (!SCM_FALSEP (hook
) && !SCM_EQ_P (scm_procedure_p (hook
), SCM_BOOL_T
))
118 SCM_MISC_ERROR ("value of %load-hook is neither a procedure nor #f",
121 if (! SCM_FALSEP (hook
))
122 scm_apply (hook
, SCM_LIST1 (filename
), SCM_EOL
);
126 port
= scm_open_file (filename
,
127 scm_makfromstr ("r", (size_t) sizeof (char), 0));
129 scm_internal_dynamic_wind (swap_port
,
132 (void *) SCM_UNPACK (port
),
134 scm_close_port (port
);
136 return SCM_UNSPECIFIED
;
141 /* Builtin path to scheme library files. */
142 #ifdef SCM_PKGDATA_DIR
143 SCM_DEFINE (scm_sys_package_data_dir
, "%package-data-dir", 0, 0, 0,
145 "Return the name of the directory where Scheme packages, modules and\n"
146 "libraries are kept. On most Unix systems, this will be\n"
147 "@samp{/usr/local/share/guile}.")
148 #define FUNC_NAME s_scm_sys_package_data_dir
150 return scm_makfrom0str (SCM_PKGDATA_DIR
);
153 #endif /* SCM_PKGDATA_DIR */
155 #ifdef SCM_LIBRARY_DIR
156 SCM_DEFINE (scm_sys_library_dir
, "%library-dir", 0,0,0,
158 "Return the directory where the Guile Scheme library files are installed.\n"
159 "E.g., may return \"/usr/share/guile/1.3.5\".")
160 #define FUNC_NAME s_scm_sys_library_dir
162 return scm_makfrom0str(SCM_LIBRARY_DIR
);
165 #endif /* SCM_LIBRARY_DIR */
168 SCM_DEFINE (scm_sys_site_dir
, "%site-dir", 0,0,0,
170 "Return the directory where the Guile site files are installed.\n"
171 "E.g., may return \"/usr/share/guile/site\".")
172 #define FUNC_NAME s_scm_sys_site_dir
174 return scm_makfrom0str(SCM_SITE_DIR
);
177 #endif /* SCM_SITE_DIR */
182 /* Initializing the load path, and searching it. */
184 /* List of names of directories we search for files to load. */
185 static SCM
*scm_loc_load_path
;
187 /* List of extensions we try adding to the filenames. */
188 static SCM
*scm_loc_load_extensions
;
191 /* Parse the null-terminated string PATH as if it were a standard path
192 environment variable (i.e. a colon-separated list of strings), and
193 prepend the elements to TAIL. */
195 scm_internal_parse_path (char *path
, SCM tail
)
197 if (path
&& path
[0] != '\0')
199 char *scan
, *elt_end
;
201 /* Scan backwards from the end of the string, to help
202 construct the list in the right order. */
203 scan
= elt_end
= path
+ strlen (path
);
205 /* Scan back to the beginning of the current element. */
207 while (scan
>= path
&& *scan
!= ':');
208 tail
= scm_cons (scm_makfromstr (scan
+ 1, elt_end
- (scan
+ 1), 0),
211 } while (scan
>= path
);
218 SCM_DEFINE (scm_parse_path
, "parse-path", 1, 1, 0,
219 (SCM path
, SCM tail
),
220 "Parse @var{path}, which is expected to be a colon-separated\n"
221 "string, into a list and return the resulting list with\n"
222 "@var{tail} appended. If @var{path} is @code{#f}, @var{tail}\n"
224 #define FUNC_NAME s_scm_parse_path
226 SCM_ASSERT (SCM_FALSEP (path
) || (SCM_STRINGP (path
)),
228 SCM_ARG1
, FUNC_NAME
);
229 if (SCM_UNBNDP (tail
))
231 return (SCM_FALSEP (path
)
233 : scm_internal_parse_path (SCM_STRING_CHARS (path
), tail
));
238 /* Initialize the global variable %load-path, given the value of the
239 SCM_SITE_DIR and SCM_LIBRARY_DIR preprocessor symbols and the
240 GUILE_LOAD_PATH environment variable. */
242 scm_init_load_path ()
246 #ifdef SCM_LIBRARY_DIR
247 path
= SCM_LIST3 (scm_makfrom0str (SCM_SITE_DIR
),
248 scm_makfrom0str (SCM_LIBRARY_DIR
),
249 scm_makfrom0str (SCM_PKGDATA_DIR
));
250 #endif /* SCM_LIBRARY_DIR */
252 path
= scm_internal_parse_path (getenv ("GUILE_LOAD_PATH"), path
);
254 *scm_loc_load_path
= path
;
257 SCM scm_listofnullstr
;
259 /* Search PATH for a directory containing a file named FILENAME.
260 The file must be readable, and not a directory.
261 If we find one, return its full filename; otherwise, return #f.
262 If FILENAME is absolute, return it unchanged.
263 If given, EXTENSIONS is a list of strings; for each directory
264 in PATH, we search for FILENAME concatenated with each EXTENSION. */
265 SCM_DEFINE (scm_search_path
, "search-path", 2, 1, 0,
266 (SCM path
, SCM filename
, SCM extensions
),
267 "Search @var{path} for a directory containing a file named\n"
268 "@var{filename}. The file must be readable, and not a directory.\n"
269 "If we find one, return its full filename; otherwise, return\n"
270 "@code{#f}. If @var{filename} is absolute, return it unchanged.\n"
271 "If given, @var{extensions} is a list of strings; for each\n"
272 "directory in @var{path}, we search for @var{filename}\n"
273 "concatenated with each @var{extension}.")
274 #define FUNC_NAME s_scm_search_path
276 char *filename_chars
;
278 size_t max_path_len
; /* maximum length of any PATH element */
279 size_t max_ext_len
; /* maximum length of any EXTENSIONS element */
281 SCM_VALIDATE_LIST (1,path
);
282 SCM_VALIDATE_STRING (2, filename
);
283 if (SCM_UNBNDP (extensions
))
284 extensions
= SCM_EOL
;
286 SCM_VALIDATE_LIST (3,extensions
);
288 filename_chars
= SCM_STRING_CHARS (filename
);
289 filename_len
= SCM_STRING_LENGTH (filename
);
291 /* If FILENAME is absolute, return it unchanged. */
292 if (filename_len
>= 1 && filename_chars
[0] == '/')
295 /* Find the length of the longest element of path. */
300 for (walk
= path
; !SCM_NULLP (walk
); walk
= SCM_CDR (walk
))
302 SCM elt
= SCM_CAR (walk
);
303 SCM_ASSERT_TYPE (SCM_STRINGP (elt
), path
, 1, FUNC_NAME
,
305 if (SCM_STRING_LENGTH (elt
) > max_path_len
)
306 max_path_len
= SCM_STRING_LENGTH (elt
);
310 /* If FILENAME has an extension, don't try to add EXTENSIONS to it. */
314 for (endp
= filename_chars
+ filename_len
- 1;
315 endp
>= filename_chars
;
320 /* This filename already has an extension, so cancel the
321 list of extensions. */
322 extensions
= SCM_EOL
;
325 else if (*endp
== '/')
326 /* This filename has no extension, so keep the current list
332 /* Find the length of the longest element of the load extensions
338 for (walk
= extensions
; !SCM_NULLP (walk
); walk
= SCM_CDR (walk
))
340 SCM elt
= SCM_CAR (walk
);
341 SCM_ASSERT_TYPE (SCM_STRINGP (elt
), elt
, 3, FUNC_NAME
,
343 if (SCM_STRING_LENGTH (elt
) > max_ext_len
)
344 max_ext_len
= SCM_STRING_LENGTH (elt
);
351 SCM result
= SCM_BOOL_F
;
352 size_t buf_size
= max_path_len
+ 1 + filename_len
+ max_ext_len
+ 1;
353 char *buf
= SCM_MUST_MALLOC (buf_size
);
355 /* This simplifies the loop below a bit. */
356 if (SCM_NULLP (extensions
))
357 extensions
= scm_listofnullstr
;
359 /* Try every path element. At this point, we know the path is a
360 proper list of strings. */
361 for (; !SCM_NULLP (path
); path
= SCM_CDR (path
))
364 SCM dir
= SCM_CAR (path
);
367 /* Concatenate the path name and the filename. */
368 len
= SCM_STRING_LENGTH (dir
);
369 memcpy (buf
, SCM_STRING_CHARS (dir
), len
);
370 if (len
>= 1 && buf
[len
- 1] != '/')
372 memcpy (buf
+ len
, filename_chars
, filename_len
);
375 /* Try every extension. At this point, we know the extension
376 list is a proper, nonempty list of strings. */
377 for (exts
= extensions
; !SCM_NULLP (exts
); exts
= SCM_CDR (exts
))
379 SCM ext
= SCM_CAR (exts
);
380 size_t ext_len
= SCM_STRING_LENGTH (ext
);
383 /* Concatenate the extension. */
384 memcpy (buf
+ len
, SCM_STRING_CHARS (ext
), ext_len
);
385 buf
[len
+ ext_len
] = '\0';
387 /* If the file exists at all, we should return it. If the
388 file is inaccessible, then that's an error. */
389 if (stat (buf
, &mode
) == 0
390 && ! (mode
.st_mode
& S_IFDIR
))
392 result
= scm_makfromstr (buf
, len
+ ext_len
, 0);
400 scm_done_free (buf_size
);
408 /* Search %load-path for a directory containing a file named FILENAME.
409 The file must be readable, and not a directory.
410 If we find one, return its full filename; otherwise, return #f.
411 If FILENAME is absolute, return it unchanged. */
412 SCM_DEFINE (scm_sys_search_load_path
, "%search-load-path", 1, 0, 0,
414 "Search @var{%load-path} for the file named @var{filename},\n"
415 "which must be readable by the current user. If @var{filename}\n"
416 "is found in the list of paths to search or is an absolute\n"
417 "pathname, return its full pathname. Otherwise, return\n"
418 "@code{#f}. Filenames may have any of the optional extensions\n"
419 "in the @code{%load-extensions} list; @code{%search-load-path}\n"
420 "will try each extension automatically.")
421 #define FUNC_NAME s_scm_sys_search_load_path
423 SCM path
= *scm_loc_load_path
;
424 SCM exts
= *scm_loc_load_extensions
;
425 SCM_VALIDATE_STRING (1, filename
);
427 if (scm_ilength (path
) < 0)
428 SCM_MISC_ERROR ("%load-path is not a proper list", SCM_EOL
);
429 if (scm_ilength (exts
) < 0)
430 SCM_MISC_ERROR ("%load-extension list is not a proper list", SCM_EOL
);
431 return scm_search_path (path
, filename
, exts
);
436 SCM_DEFINE (scm_primitive_load_path
, "primitive-load-path", 1, 0, 0,
438 "Search @var{%load-path} for the file named @var{filename} and\n"
439 "load it into the top-level environment. If @var{filename} is a\n"
440 "relative pathname and is not found in the list of search paths,\n"
441 "an error is signalled.")
442 #define FUNC_NAME s_scm_primitive_load_path
446 SCM_VALIDATE_STRING (1, filename
);
448 full_filename
= scm_sys_search_load_path (filename
);
450 if (SCM_FALSEP (full_filename
))
452 int absolute
= (SCM_STRING_LENGTH (filename
) >= 1
453 && SCM_STRING_CHARS (filename
)[0] == '/');
454 SCM_MISC_ERROR ((absolute
455 ? "Unable to load file ~S"
456 : "Unable to find file ~S in load path"),
457 SCM_LIST1 (filename
));
460 return scm_primitive_load (full_filename
);
464 #if SCM_DEBUG_DEPRECATED == 0
466 /* Eval now copies source properties, so this function is no longer required.
469 SCM_SYMBOL (scm_end_of_file_key
, "end-of-file");
471 SCM_DEFINE (scm_read_and_eval_x
, "read-and-eval!", 0, 1, 0,
473 "Read a form from @var{port} (standard input by default), and evaluate it\n"
474 "(memoizing it in the process) in the top-level environment. If no data\n"
475 "is left to be read from @var{port}, an @code{end-of-file} error is\n"
477 #define FUNC_NAME s_scm_read_and_eval_x
479 SCM form
= scm_read (port
);
480 if (SCM_EOF_OBJECT_P (form
))
481 scm_ithrow (scm_end_of_file_key
, SCM_EOL
, 1);
482 return scm_eval_x (form
, scm_current_module ());
489 /* Information about the build environment. */
491 /* Initialize the scheme variable %guile-build-info, based on data
492 provided by the Makefile, via libpath.h. */
496 static struct { char *name
; char *value
; } info
[] = SCM_BUILD_INFO
;
497 SCM
*loc
= SCM_VARIABLE_LOC (scm_c_define ("%guile-build-info", SCM_EOL
));
500 for (i
= 0; i
< (sizeof (info
) / sizeof (info
[0])); i
++)
501 *loc
= scm_acons (scm_str2symbol (info
[i
].name
),
502 scm_makfrom0str (info
[i
].value
),
511 scm_listofnullstr
= scm_permanent_object (SCM_LIST1 (scm_nullstr
));
512 scm_loc_load_path
= SCM_VARIABLE_LOC (scm_c_define ("%load-path", SCM_EOL
));
513 scm_loc_load_extensions
514 = SCM_VARIABLE_LOC (scm_c_define ("%load-extensions",
515 SCM_LIST2 (scm_makfrom0str (".scm"),
517 scm_loc_load_hook
= SCM_VARIABLE_LOC (scm_c_define ("%load-hook", SCM_BOOL_F
));
521 #ifndef SCM_MAGIC_SNARFER
522 #include "libguile/load.x"