-/* Copyright (C) 1995,1996 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1998 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. */
\f
#include <stdio.h>
#include "_scm.h"
+#include "libpath.h"
+#include "fports.h"
+#include "read.h"
+#include "eval.h"
+#include "throw.h"
+#include "alist.h"
+#include "dynwind.h"
+
+#include "load.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif /* HAVE_UNISTD_H */
+
+#ifndef R_OK
+#define R_OK 4
+#endif
\f
+/* Loading a file, given an absolute filename. */
-SCM_PROC(s_sys_try_load, "%try-load", 1, 2, 0, scm_sys_try_load);
-#ifdef __STDC__
-SCM
-scm_sys_try_load (SCM filename, SCM case_insensative_p, SCM sharp)
-#else
+/* 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 *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_PROC(s_primitive_load, "primitive-load", 1, 0, 0, scm_primitive_load);
SCM
-scm_sys_try_load (filename, case_insensative_p, sharp)
+scm_primitive_load (filename)
SCM filename;
- SCM case_insensative_p;
- SCM sharp;
-#endif
{
- SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename, SCM_ARG1, s_sys_try_load);
+ SCM hook = *scm_loc_load_hook;
+ SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename,
+ SCM_ARG1, s_primitive_load);
+ SCM_ASSERT (hook == SCM_BOOL_F
+ || (scm_procedure_p (hook) == SCM_BOOL_T),
+ hook, "value of %load-hook is neither a procedure nor #f",
+ s_primitive_load);
+
+ if (hook != SCM_BOOL_F)
+ scm_apply (hook, scm_listify (filename, SCM_UNDEFINED), SCM_EOL);
+
{
- SCM form, port;
+ SCM port, save_port;
port = scm_open_file (filename,
scm_makfromstr ("r", (scm_sizet) sizeof (char), 0));
- if (SCM_FALSEP (port))
- return SCM_BOOL_F;
- while (1)
- {
- form = scm_read (port, case_insensative_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_BOOL_T;
+ return SCM_UNSPECIFIED;
+}
+
+\f
+/* Builtin path to scheme library files. */
+#ifdef SCM_PKGDATA_DIR
+SCM_PROC (s_sys_package_data_dir, "%package-data-dir", 0, 0, 0, scm_sys_package_data_dir);
+SCM
+scm_sys_package_data_dir ()
+{
+ return scm_makfrom0str (SCM_PKGDATA_DIR);
}
+#endif /* SCM_PKGDATA_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;
-#ifdef __STDC__
+ /* 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_PROC (s_parse_path, "parse-path", 1, 1, 0, scm_parse_path);
+
+SCM
+scm_parse_path (SCM path, SCM tail)
+{
+ SCM_ASSERT (SCM_FALSEP (path) || (SCM_NIMP (path) && SCM_ROSTRINGP (path)),
+ path,
+ SCM_ARG1,
+ s_parse_path);
+ if (SCM_UNBNDP (tail))
+ tail = SCM_EOL;
+ return (SCM_FALSEP (path)
+ ? tail
+ : scm_internal_parse_path (SCM_ROCHARS (path), tail));
+}
+
+
+/* Initialize the global variable %load-path, given the value of the
+ SCM_SITE_DIR and SCM_LIBRARY_DIR preprocessor symbols and the
+ GUILE_LOAD_PATH environment variable. */
void
-scm_init_load (void)
-#else
+scm_init_load_path ()
+{
+ SCM path = SCM_EOL;
+
+#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 */
+
+ /* For compatibility, we still check this, but give a warning. */
+ {
+ char *p = getenv ("SCHEME_LOAD_PATH");
+ if (p && p[0] != '\0')
+ {
+ fprintf (stderr, "guile: warning: SCHEME_LOAD_PATH variable will be"
+ " removed by Guile 1.4;\n"
+ " use GUILE_LOAD_PATH instead\n");
+ path = scm_internal_parse_path (p, path);
+ }
+ }
+
+ path = scm_internal_parse_path (getenv ("GUILE_LOAD_PATH"), path);
+
+ *scm_loc_load_path = path;
+}
+
+SCM scm_listofnullstr;
+
+/* 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.
+ If FILENAME is absolute, return it unchanged. */
+SCM_PROC(s_search_path, "search-path", 2, 1, 0, scm_search_path);
+SCM
+scm_search_path (path, filename, extensions)
+ SCM path;
+ SCM filename;
+ SCM extensions;
+{
+ char *buf;
+ int filename_len;
+ size_t max_path_len;
+ size_t max_ext_len;
+
+ SCM_ASSERT (scm_ilength (path) >= 0, path, SCM_ARG1, s_search_path);
+ SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename,
+ SCM_ARG2, s_search_path);
+ if (SCM_UNBNDP (extensions))
+ extensions = scm_listofnullstr;
+ else
+ SCM_ASSERT (scm_ilength (extensions) >= 0, extensions,
+ SCM_ARG3, s_search_path);
+ filename_len = SCM_ROLENGTH (filename);
+
+ /* If FILENAME is absolute, return it unchanged. */
+ if (filename_len >= 1
+ && SCM_ROCHARS (filename)[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_NIMP (elt) && SCM_ROSTRINGP (elt), elt,
+ "path is not a list of strings",
+ s_search_path);
+ if (SCM_LENGTH (elt) > max_path_len)
+ max_path_len = SCM_LENGTH (elt);
+ }
+ }
+
+ /* Find the length of the longest element of the load extensions
+ list. */
+ {
+ SCM walk;
+
+ max_ext_len = 0;
+ for (walk = extensions; SCM_NIMP (walk); walk = SCM_CDR (walk))
+ {
+ SCM elt = SCM_CAR (walk);
+ SCM_ASSERT (SCM_NIMP (elt) && SCM_ROSTRINGP (elt), elt,
+ "extension list is not a list of strings",
+ s_search_path);
+ if (SCM_LENGTH (elt) > max_ext_len)
+ max_ext_len = SCM_LENGTH (elt);
+ }
+ }
+
+ SCM_DEFER_INTS;
+
+ buf = scm_must_malloc (max_path_len + 1 + filename_len + max_ext_len + 1,
+ s_search_path);
+
+ /* Try every path element. At this point, we know it's a proper
+ list of strings. */
+ for (; SCM_NIMP (path); path = SCM_CDR (path))
+ {
+ SCM path_elt = SCM_CAR (path), exts;
+
+ /* Try every extension. At this point, we know it's a proper
+ list of strings. */
+ for (exts = extensions; SCM_NIMP (exts); exts = SCM_CDR (exts))
+ {
+ SCM ext_elt = SCM_CAR (exts);
+ int i;
+
+ /* Concatenate the path name, the filename, and the extension. */
+ i = SCM_ROLENGTH (path_elt);
+ memcpy (buf, SCM_ROCHARS (path_elt), i);
+ if (i >= 1 && buf[i - 1] != '/')
+ buf[i++] = '/';
+ memcpy (buf + i, SCM_ROCHARS (filename), filename_len);
+ i += filename_len;
+ memcpy (buf + i, SCM_ROCHARS (ext_elt), SCM_LENGTH (ext_elt));
+ i += SCM_LENGTH (ext_elt);
+ buf[i] = '\0';
+
+ {
+ struct stat mode;
+
+ if (stat (buf, &mode) >= 0
+ && ! (mode.st_mode & S_IFDIR)
+ && access (buf, R_OK) == 0)
+ {
+ SCM result = scm_makfromstr (buf, i, 0);
+ scm_must_free (buf);
+ SCM_ALLOW_INTS;
+ return result;
+ }
+ }
+ }
+ }
+
+ scm_must_free (buf);
+ SCM_ALLOW_INTS;
+ return SCM_BOOL_F;
+}
+
+
+/* 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_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;
+{
+ SCM path = *scm_loc_load_path;
+ SCM exts = *scm_loc_load_extensions;
+ SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename,
+ SCM_ARG1, s_sys_search_load_path);
+ SCM_ASSERT (scm_ilength (path) >= 0, path, "load path is not a proper list",
+ s_sys_search_load_path);
+ SCM_ASSERT (scm_ilength (exts) >= 0, exts,
+ "load extension list is not a proper list",
+ s_sys_search_load_path);
+ return scm_search_path (path,
+ filename,
+ exts);
+}
+
+
+SCM_PROC(s_primitive_load_path, "primitive-load-path", 1, 0, 0, scm_primitive_load_path);
+SCM
+scm_primitive_load_path (filename)
+ SCM filename;
+{
+ SCM full_filename;
+
+ SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename,
+ SCM_ARG1, s_primitive_load_path);
+
+ full_filename = scm_sys_search_load_path (filename);
+
+ if (SCM_FALSEP (full_filename))
+ {
+ int absolute = (SCM_LENGTH (filename) >= 1
+ && SCM_ROCHARS (filename)[0] == '/');
+ scm_misc_error (s_primitive_load_path,
+ (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);
+}
+
+/* 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_PROC (s_read_and_eval_x, "read-and-eval!", 0, 1, 0, scm_read_and_eval_x);
+
+SCM
+scm_read_and_eval_x (port)
+ SCM port;
+{
+ 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);
+}
+
+\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 ()
-#endif
{
+ 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_makfrom0str (".scm"),
+ 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