-/* Copyright (C) 1995,1996 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1998,1999 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
- * If you do not wish that, delete this exception notice.
- */
+ * If you do not wish that, delete this exception notice. */
+
+/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
+ gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
+
\f
#include <stdio.h>
#include "fports.h"
#include "read.h"
#include "eval.h"
+#include "throw.h"
+#include "alist.h"
+#include "dynwind.h"
+#include "scm_validate.h"
#include "load.h"
#include <sys/types.h>
\f
/* Loading a file, given an absolute filename. */
-SCM_PROC(s_sys_try_load, "primitive-load", 1, 2, 0, scm_primitive_load);
-SCM
-scm_primitive_load (filename, case_insensitive_p, sharp)
- SCM filename;
- SCM case_insensitive_p;
- SCM sharp;
+/* Hook to run when we load a file, perhaps to announce the fact somewhere.
+ Applied to the full name of the file. */
+static SCM *scm_loc_load_hook;
+
+static void
+swap_port (void *data)
{
- SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename,
- SCM_ARG1, s_sys_try_load);
- {
- SCM form, port;
+ SCM *save_port = data, tmp = scm_cur_loadp;
+ scm_cur_loadp = *save_port;
+ *save_port = tmp;
+}
+
+static SCM
+load (void *data)
+{
+ SCM port = (SCM) data, form;
+ while (1)
+ {
+ form = scm_read (port);
+ if (SCM_EOF_OBJECT_P (form))
+ break;
+ scm_eval_x (form);
+ }
+ return SCM_UNSPECIFIED;
+}
+
+SCM_DEFINE(scm_primitive_load, "primitive-load", 1, 0, 0,
+ (SCM filename),
+"Load @var{file} and evaluate its contents in the top-level environment.
+The load paths are not searched; @var{file} must either be a full
+pathname or be a pathname relative to the current directory. If the
+variable @code{%load-hook} is defined, it should be bound to a procedure
+that will be called before any code is loaded. See documentation for
+@code{%load-hook} later in this section.")
+#define FUNC_NAME s_scm_primitive_load
+{
+ SCM hook = *scm_loc_load_hook;
+ SCM_VALIDATE_ROSTRING(1,filename);
+ SCM_ASSERT (hook == SCM_BOOL_F
+ || (scm_procedure_p (hook) == SCM_BOOL_T),
+ hook, "value of %load-hook is neither a procedure nor #f",
+ FUNC_NAME);
+
+ if (hook != SCM_BOOL_F)
+ scm_apply (hook, scm_listify (filename, SCM_UNDEFINED), SCM_EOL);
+
+ { /* scope */
+ SCM port, save_port;
port = scm_open_file (filename,
scm_makfromstr ("r", (scm_sizet) sizeof (char), 0));
- while (1)
- {
- form = scm_read (port, case_insensitive_p, sharp);
- if (SCM_EOF_VAL == form)
- break;
- scm_eval_x (form);
- }
+ save_port = port;
+ scm_internal_dynamic_wind (swap_port,
+ load,
+ swap_port,
+ (void *) port,
+ &save_port);
scm_close_port (port);
}
return SCM_UNSPECIFIED;
}
+#undef FUNC_NAME
+
+\f
+/* Builtin path to scheme library files. */
+#ifdef SCM_PKGDATA_DIR
+SCM_DEFINE (scm_sys_package_data_dir, "%package-data-dir", 0, 0, 0,
+ (),
+"Return the name of the directory where Scheme packages, modules and
+libraries are kept. On most Unix systems, this will be
+@samp{/usr/local/share/guile}.")
+#define FUNC_NAME s_scm_sys_package_data_dir
+{
+ return scm_makfrom0str (SCM_PKGDATA_DIR);
+}
+#undef FUNC_NAME
+#endif /* SCM_PKGDATA_DIR */
+
+#ifdef SCM_LIBRARY_DIR
+SCM_DEFINE (scm_sys_library_dir, "%library-dir", 0,0,0,
+ (),
+"Return the directory where the Guile Scheme library files are installed.
+E.g., may return \"/usr/share/guile/1.3.5\".")
+#define FUNC_NAME s_scm_sys_library_dir
+{
+ return scm_makfrom0str(SCM_LIBRARY_DIR);
+}
+#undef FUNC_NAME
+#endif /* SCM_LIBRARY_DIR */
+
+#ifdef SCM_SITE_DIR
+SCM_DEFINE (scm_sys_site_dir, "%site-dir", 0,0,0,
+ (),
+"Return the directory where the Guile site files are installed.
+E.g., may return \"/usr/share/guile/site\".")
+#define FUNC_NAME s_scm_sys_site_dir
+{
+ return scm_makfrom0str(SCM_SITE_DIR);
+}
+#undef FUNC_NAME
+#endif /* SCM_SITE_DIR */
+
+
\f
/* Initializing the load path, and searching it. */
+/* List of names of directories we search for files to load. */
static SCM *scm_loc_load_path;
+/* List of extensions we try adding to the filenames. */
+static SCM *scm_loc_load_extensions;
+
+
+/* Parse the null-terminated string PATH as if it were a standard path
+ environment variable (i.e. a colon-separated list of strings), and
+ prepend the elements to TAIL. */
+SCM
+scm_internal_parse_path (char *path, SCM tail)
+{
+ if (path && path[0] != '\0')
+ {
+ char *scan, *elt_end;
+
+ /* Scan backwards from the end of the string, to help
+ construct the list in the right order. */
+ scan = elt_end = path + strlen (path);
+ do {
+ /* Scan back to the beginning of the current element. */
+ do scan--;
+ while (scan >= path && *scan != ':');
+ tail = scm_cons (scm_makfromstr (scan + 1, elt_end - (scan + 1), 0),
+ tail);
+ elt_end = scan;
+ } while (scan >= path);
+ }
+
+ return tail;
+}
+
+
+SCM_DEFINE (scm_parse_path, "parse-path", 1, 1, 0,
+ (SCM path, SCM tail),
+"")
+#define FUNC_NAME s_scm_parse_path
+{
+ SCM_ASSERT (SCM_FALSEP (path) || (SCM_ROSTRINGP (path)),
+ path,
+ SCM_ARG1, FUNC_NAME);
+ if (SCM_UNBNDP (tail))
+ tail = SCM_EOL;
+ return (SCM_FALSEP (path)
+ ? tail
+ : scm_internal_parse_path (SCM_ROCHARS (path), tail));
+}
+#undef FUNC_NAME
+
+
/* Initialize the global variable %load-path, given the value of the
- LIBRARY_PATH preprocessor symbol and the SCHEME_LOAD_PATH
- environment variable. */
+ SCM_SITE_DIR and SCM_LIBRARY_DIR preprocessor symbols and the
+ GUILE_LOAD_PATH environment variable. */
void
scm_init_load_path ()
{
SCM path = SCM_EOL;
-#ifdef LIBRARY_PATH
- path = scm_cons (scm_makfrom0str (LIBRARY_PATH), path);
-#endif /* LIBRARY_PATH */
-
- {
- char *path_string = getenv ("SCHEME_LOAD_PATH");
+#ifdef SCM_LIBRARY_DIR
+ path = scm_listify (scm_makfrom0str (SCM_SITE_DIR),
+ scm_makfrom0str (SCM_LIBRARY_DIR),
+ scm_makfrom0str (SCM_PKGDATA_DIR),
+ SCM_UNDEFINED);
+#endif /* SCM_LIBRARY_DIR */
- if (path_string && path_string[0] != '\0')
- {
- char *scan, *elt_end;
-
- /* Scan backwards from the end of the string, to help
- construct the list in the right order. */
- scan = elt_end = path_string + strlen (path_string);
- do {
- /* Scan back to the beginning of the current element. */
- do scan--;
- while (scan >= path_string && *scan != ':');
- path = scm_cons (scm_makfromstr (scan + 1, elt_end - (scan + 1), 0),
- path);
- elt_end = scan;
- } while (scan >= path_string);
- }
- }
+ path = scm_internal_parse_path (getenv ("GUILE_LOAD_PATH"), path);
*scm_loc_load_path = path;
}
+SCM scm_listofnullstr;
-/* Search %load-path for a directory containing a file named FILENAME.
+/* Search PATH for a directory containing a file named FILENAME.
The file must be readable, and not a directory.
- If we find one, return its full filename; otherwise, return #f. */
-SCM_PROC(s_sys_search_load_path, "%search-load-path", 1, 0, 0, scm_sys_search_load_path);
-SCM
-scm_sys_search_load_path (filename)
- SCM filename;
+ If we find one, return its full filename; otherwise, return #f.
+ If FILENAME is absolute, return it unchanged.
+ If given, EXTENSIONS is a list of strings; for each directory
+ in PATH, we search for FILENAME concatenated with each EXTENSION. */
+SCM_DEFINE(scm_search_path, "search-path", 2, 1, 0,
+ (SCM path, SCM filename, SCM extensions),
+"")
+#define FUNC_NAME s_scm_search_path
{
- SCM path = *scm_loc_load_path;
- char *buf;
- int buf_size;
+ char *filename_chars;
int filename_len;
+ size_t max_path_len; /* maximum length of any PATH element */
+ size_t max_ext_len; /* maximum length of any EXTENSIONS element */
+
+ SCM_VALIDATE_LIST(1,path);
+ SCM_VALIDATE_ROSTRING(2,filename);
+ if (SCM_UNBNDP (extensions))
+ extensions = SCM_EOL;
+ else
+ SCM_VALIDATE_LIST(3,extensions);
- SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename,
- SCM_ARG1, s_sys_search_load_path);
+ filename_chars = SCM_ROCHARS (filename);
filename_len = SCM_ROLENGTH (filename);
+ /* If FILENAME is absolute, return it unchanged. */
+ if (filename_len >= 1 && filename_chars[0] == '/')
+ return filename;
+
+ /* Find the length of the longest element of path. */
+ {
+ SCM walk;
+
+ max_path_len = 0;
+ for (walk = path; SCM_NIMP (walk); walk = SCM_CDR (walk))
+ {
+ SCM elt = SCM_CAR (walk);
+ SCM_ASSERT (SCM_ROSTRINGP (elt), elt,
+ "path is not a list of strings",
+ FUNC_NAME);
+ if (SCM_ROLENGTH (elt) > max_path_len)
+ max_path_len = SCM_ROLENGTH (elt);
+ }
+ }
+
+ /* If FILENAME has an extension, don't try to add EXTENSIONS to it. */
+ {
+ char *endp;
+
+ for (endp = filename_chars + filename_len - 1;
+ endp >= filename_chars;
+ endp--)
+ {
+ if (*endp == '.')
+ {
+ /* This filename already has an extension, so cancel the
+ list of extensions. */
+ extensions = SCM_EOL;
+ break;
+ }
+ else if (*endp == '/')
+ /* This filename has no extension, so keep the current list
+ of extensions. */
+ break;
+ }
+ }
+
+ /* Find the length of the longest element of the load extensions
+ list. */
+ { /* scope */
+ SCM walk;
+
+ max_ext_len = 0;
+ for (walk = extensions; SCM_NIMP (walk); walk = SCM_CDR (walk))
+ {
+ SCM elt = SCM_CAR (walk);
+ SCM_ASSERT (SCM_ROSTRINGP (elt), elt,
+ "extension list is not a list of strings",
+ FUNC_NAME);
+ if (SCM_ROLENGTH (elt) > max_ext_len)
+ max_ext_len = SCM_ROLENGTH (elt);
+ }
+ }
+
SCM_DEFER_INTS;
- buf_size = 80;
- buf = scm_must_malloc (buf_size, s_sys_search_load_path);
+ { /* scope */
+ SCM result = SCM_BOOL_F;
+ int buf_size = max_path_len + 1 + filename_len + max_ext_len + 1;
+ char *buf = SCM_MUST_MALLOC (buf_size);
- while (SCM_NIMP (path) && SCM_CONSP (path))
- {
- SCM elt = SCM_CAR (path);
- if (SCM_NIMP (elt) && SCM_ROSTRINGP (elt))
- {
- int len = SCM_ROLENGTH (elt) + 1 + filename_len;
-
- if (len + 1 > buf_size)
- {
- int old_size = buf_size;
- buf_size = len + 50;
- buf = scm_must_realloc (buf, old_size, buf_size,
- s_sys_search_load_path);
- }
-
- memcpy (buf, SCM_ROCHARS (elt), SCM_ROLENGTH (elt));
- buf[SCM_ROLENGTH (elt)] = '/';
- memcpy (buf + SCM_ROLENGTH (elt) + 1,
- SCM_ROCHARS (filename), filename_len);
- buf[len] = '\0';
+ /* This simplifies the loop below a bit. */
+ if (SCM_NULLP (extensions))
+ extensions = scm_listofnullstr;
+
+ /* Try every path element. At this point, we know the path is a
+ proper list of strings. */
+ for (; SCM_NIMP (path); path = SCM_CDR (path))
+ {
+ int len;
+ SCM dir = SCM_CAR (path);
+ SCM exts;
+ /* Concatenate the path name and the filename. */
+ len = SCM_ROLENGTH (dir);
+ memcpy (buf, SCM_ROCHARS (dir), len);
+ if (len >= 1 && buf[len - 1] != '/')
+ buf[len++] = '/';
+ memcpy (buf + len, filename_chars, filename_len);
+ len += filename_len;
+
+ /* Try every extension. At this point, we know the extension
+ list is a proper, nonempty list of strings. */
+ for (exts = extensions; SCM_NIMP (exts); exts = SCM_CDR (exts))
{
+ SCM ext = SCM_CAR (exts);
+ int ext_len = SCM_ROLENGTH (ext);
struct stat mode;
- if (stat (buf, &mode) >= 0
- && ! (mode.st_mode & S_IFDIR)
- && access (buf, R_OK) == 0)
+ /* Concatenate the extension. */
+ memcpy (buf + len, SCM_ROCHARS (ext), ext_len);
+ buf[len + ext_len] = '\0';
+
+ /* If the file exists at all, we should return it. If the
+ file is inaccessible, then that's an error. */
+ if (stat (buf, &mode) == 0
+ && ! (mode.st_mode & S_IFDIR))
{
- SCM result = scm_makfromstr (buf, len, 0);
- scm_must_free (buf);
- SCM_ALLOW_INTS;
- return result;
+ result = scm_makfromstr (buf, len + ext_len, 0);
+ goto end;
}
}
- }
+ }
- path = SCM_CDR (path);
- }
-
- scm_must_free (buf);
- SCM_ALLOW_INTS;
- return SCM_BOOL_F;
+ end:
+ scm_must_free (buf);
+ scm_done_malloc (- buf_size);
+ SCM_ALLOW_INTS;
+ return result;
+ }
}
+#undef FUNC_NAME
-SCM_PROC(s_sys_try_load_path, "primitive-load-path", 1, 2, 0,scm_primitive_load_path);
-SCM
-scm_primitive_load_path (filename, case_insensitive_p, sharp)
- SCM filename;
- SCM case_insensitive_p;
- SCM sharp;
+/* Search %load-path for a directory containing a file named FILENAME.
+ The file must be readable, and not a directory.
+ If we find one, return its full filename; otherwise, return #f.
+ If FILENAME is absolute, return it unchanged. */
+SCM_DEFINE(scm_sys_search_load_path, "%search-load-path", 1, 0, 0,
+ (SCM filename),
+"Search @var{%load-path} for @var{file}, which must be readable by the
+current user. If @var{file} is found in the list of paths to search or
+is an absolute pathname, return its full pathname. Otherwise, return
+@code{#f}. Filenames may have any of the optional extensions in the
+@code{%load-extensions} list; @code{%search-load-path} will try each
+extension automatically.")
+#define FUNC_NAME s_scm_sys_search_load_path
{
- SCM full_filename = scm_sys_search_load_path (filename);
+ SCM path = *scm_loc_load_path;
+ SCM exts = *scm_loc_load_extensions;
+ SCM_VALIDATE_ROSTRING(1,filename);
+
+ SCM_ASSERT (scm_ilength (path) >= 0, path, "load path is not a proper list",
+ FUNC_NAME);
+ SCM_ASSERT (scm_ilength (exts) >= 0, exts,
+ "load extension list is not a proper list",
+ FUNC_NAME);
+ return scm_search_path (path, filename, exts);
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE(scm_primitive_load_path, "primitive-load-path", 1, 0, 0,
+ (SCM filename),
+"Search @var{%load-path} for @var{file} and load it into the top-level
+environment. If @var{file} is a relative pathname and is not found in
+the list of search paths, an error is signalled.")
+#define FUNC_NAME s_scm_primitive_load_path
+{
+ SCM full_filename;
+
+ SCM_VALIDATE_ROSTRING(1,filename);
+
+ full_filename = scm_sys_search_load_path (filename);
+
if (SCM_FALSEP (full_filename))
{
- scm_error (scm_misc_error_key,
- s_sys_try_load_path,
- "Unable to find file %S in %S",
- scm_listify (filename, *scm_loc_load_path, SCM_UNDEFINED),
- SCM_BOOL_F);
+ int absolute = (SCM_ROLENGTH (filename) >= 1
+ && SCM_ROCHARS (filename)[0] == '/');
+ scm_misc_error (FUNC_NAME,
+ (absolute
+ ? "Unable to load file %S"
+ : "Unable to find file %S in load path"),
+ scm_listify (filename, SCM_UNDEFINED));
}
- return scm_primitive_load (full_filename, case_insensitive_p, sharp);
+
+ return scm_primitive_load (full_filename);
}
+#undef FUNC_NAME
+
+/* The following function seems trivial - and indeed it is. Its
+ * existence is motivated by its ability to evaluate expressions
+ * without copying them first (as is done in "eval").
+ */
+
+SCM_SYMBOL (scm_end_of_file_key, "end-of-file");
+
+SCM_DEFINE (scm_read_and_eval_x, "read-and-eval!", 0, 1, 0,
+ (SCM port),
+"Read a form from @var{port} (standard input by default), and evaluate it
+(memoizing it in the process) in the top-level environment. If no data
+is left to be read from @var{port}, an @code{end-of-file} error is
+signalled.")
+#define FUNC_NAME s_scm_read_and_eval_x
+{
+ SCM form = scm_read (port);
+ if (SCM_EOF_OBJECT_P (form))
+ scm_ithrow (scm_end_of_file_key, SCM_EOL, 1);
+ return scm_eval_x (form);
+}
+#undef FUNC_NAME
\f
+/* Information about the build environment. */
+/* Initialize the scheme variable %guile-build-info, based on data
+ provided by the Makefile, via libpath.h. */
+static void
+init_build_info ()
+{
+ static struct { char *name; char *value; } info[] = SCM_BUILD_INFO;
+ SCM *loc = SCM_CDRLOC (scm_sysintern ("%guile-build-info", SCM_EOL));
+ unsigned int i;
+
+ for (i = 0; i < (sizeof (info) / sizeof (info[0])); i++)
+ *loc = scm_acons (SCM_CAR (scm_intern0 (info[i].name)),
+ scm_makfrom0str (info[i].value),
+ *loc);
+}
+
+
+\f
void
scm_init_load ()
{
- scm_loc_load_path = &SCM_CDR(scm_sysintern("%load-path", SCM_EOL));
+ scm_listofnullstr = scm_permanent_object (SCM_LIST1 (scm_nullstr));
+ scm_loc_load_path = SCM_CDRLOC (scm_sysintern ("%load-path", SCM_EOL));
+ scm_loc_load_extensions
+ = SCM_CDRLOC (scm_sysintern ("%load-extensions",
+ scm_listify (scm_makfrom0str (".scm"),
+ scm_makfrom0str (""),
+ SCM_UNDEFINED)));
+ scm_loc_load_hook = SCM_CDRLOC (scm_sysintern ("%load-hook", SCM_BOOL_F));
+
+ init_build_info ();
#include "load.x"
}
HCoop / bpt / guile.git / blobdiff