-/* Copyright (C) 1995,1996 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
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * 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, 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.
- *
- * The exception is that, if you link the GUILE library with other files
- * to produce an executable, this does not by itself cause the
- * resulting executable to be covered by the GNU General Public License.
- * Your use of that executable is in no way restricted on account of
- * linking the GUILE library code into it.
- *
- * This exception does not however invalidate any other reasons why
- * the executable file might be covered by the GNU General Public License.
- *
- * This exception applies only to the code released by the
- * Free Software Foundation under the name GUILE. If you copy
- * code from other Free Software Foundation releases into a copy of
- * GUILE, as the General Public License permits, the exception does
- * not apply to the code that you add in this way. To avoid misleading
- * anyone as to the status of such modified files, you must delete
- * this exception notice from them.
- *
- * 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. */
-\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. */
-
-/* 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;
-
-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_primitive_load (filename)
- SCM filename;
-{
- 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 port, save_port;
- port = scm_open_file (filename,
- scm_makfromstr ("r", (scm_sizet) sizeof (char), 0));
- save_port = port;
- scm_internal_dynamic_wind (swap_port,
- load,
- swap_port,
- (void *) port,
- &save_port);
- scm_close_port (port);
- }
- 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;
-
- /* 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_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;
- int max_path_len;
- int 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));
- 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_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"
-}
+/* Copyright (C) 1995,1996,1998,1999,2000,2001 Free Software Foundation, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+
+\f
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <string.h>
+
+#include "libguile/_scm.h"
+#include "libguile/libpath.h"
+#include "libguile/fports.h"
+#include "libguile/read.h"
+#include "libguile/eval.h"
+#include "libguile/throw.h"
+#include "libguile/alist.h"
+#include "libguile/dynwind.h"
+#include "libguile/root.h"
+#include "libguile/strings.h"
+#include "libguile/modules.h"
+#include "libguile/lang.h"
+
+#include "libguile/validate.h"
+#include "libguile/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. */
+
+/* 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_PACK (data);
+ while (1)
+ {
+ SCM form = scm_read (port);
+ if (SCM_EOF_OBJECT_P (form))
+ break;
+ scm_primitive_eval_x (form);
+ }
+ return SCM_UNSPECIFIED;
+}
+
+SCM_DEFINE (scm_primitive_load, "primitive-load", 1, 0, 0,
+ (SCM filename),
+ "Load the file named @var{filename} and evaluate its contents in\n"
+ "the top-level environment. The load paths are not searched;\n"
+ "@var{filename} must either be a full pathname or be a pathname\n"
+ "relative to the current directory. If the variable\n"
+ "@code{%load-hook} is defined, it should be bound to a procedure\n"
+ "that will be called before any code is loaded. See the\n"
+ "documentation for @code{%load-hook} later in this section.")
+#define FUNC_NAME s_scm_primitive_load
+{
+ SCM hook = *scm_loc_load_hook;
+ SCM_VALIDATE_STRING (1, filename);
+ if (!SCM_FALSEP (hook) && !SCM_EQ_P (scm_procedure_p (hook), SCM_BOOL_T))
+ SCM_MISC_ERROR ("value of %load-hook is neither a procedure nor #f",
+ SCM_EOL);
+
+ if (! SCM_FALSEP (hook))
+ scm_call_1 (hook, filename);
+
+ { /* scope */
+ SCM port, save_port;
+ port = scm_open_file (filename, scm_mem2string ("r", sizeof (char)));
+ save_port = port;
+ scm_internal_dynamic_wind (swap_port,
+ load,
+ swap_port,
+ (void *) SCM_UNPACK (port),
+ &save_port);
+ scm_close_port (port);
+ }
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+SCM
+scm_c_primitive_load (const char *filename)
+{
+ return scm_primitive_load (scm_makfrom0str (filename));
+}
+
+\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\n"
+ "libraries are kept. On most Unix systems, this will be\n"
+ "@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.\n"
+ "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.\n"
+ "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_mem2string (scan + 1, elt_end - (scan + 1)),
+ tail);
+ elt_end = scan;
+ } while (scan >= path);
+ }
+
+ return tail;
+}
+
+
+SCM_DEFINE (scm_parse_path, "parse-path", 1, 1, 0,
+ (SCM path, SCM tail),
+ "Parse @var{path}, which is expected to be a colon-separated\n"
+ "string, into a list and return the resulting list with\n"
+ "@var{tail} appended. If @var{path} is @code{#f}, @var{tail}\n"
+ "is returned.")
+#define FUNC_NAME s_scm_parse_path
+{
+ SCM_ASSERT (SCM_FALSEP (path) || (SCM_STRINGP (path)),
+ path,
+ SCM_ARG1, FUNC_NAME);
+ if (SCM_UNBNDP (tail))
+ tail = SCM_EOL;
+ return (SCM_FALSEP (path)
+ ? tail
+ : scm_internal_parse_path (SCM_STRING_CHARS (path), tail));
+}
+#undef FUNC_NAME
+
+
+/* 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_path ()
+{
+ SCM path = SCM_EOL;
+
+#ifdef SCM_LIBRARY_DIR
+ path = scm_list_3 (scm_makfrom0str (SCM_SITE_DIR),
+ scm_makfrom0str (SCM_LIBRARY_DIR),
+ scm_makfrom0str (SCM_PKGDATA_DIR));
+#endif /* SCM_LIBRARY_DIR */
+
+ 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.
+ 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),
+ "Search @var{path} for a directory containing a file named\n"
+ "@var{filename}. The file must be readable, and not a directory.\n"
+ "If we find one, return its full filename; otherwise, return\n"
+ "@code{#f}. If @var{filename} is absolute, return it unchanged.\n"
+ "If given, @var{extensions} is a list of strings; for each\n"
+ "directory in @var{path}, we search for @var{filename}\n"
+ "concatenated with each @var{extension}.")
+#define FUNC_NAME s_scm_search_path
+{
+ 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_STRING (2, filename);
+ if (SCM_UNBNDP (extensions))
+ extensions = SCM_EOL;
+ else
+ SCM_VALIDATE_LIST (3, extensions);
+
+ filename_chars = SCM_STRING_CHARS (filename);
+ filename_len = SCM_STRING_LENGTH (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_NULL_OR_NIL_P (walk); walk = SCM_CDR (walk))
+ {
+ SCM elt = SCM_CAR (walk);
+ SCM_ASSERT_TYPE (SCM_STRINGP (elt), path, 1, FUNC_NAME,
+ "list of strings");
+ if (SCM_STRING_LENGTH (elt) > max_path_len)
+ max_path_len = SCM_STRING_LENGTH (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_NULL_OR_NIL_P (walk); walk = SCM_CDR (walk))
+ {
+ SCM elt = SCM_CAR (walk);
+ SCM_ASSERT_TYPE (SCM_STRINGP (elt), elt, 3, FUNC_NAME,
+ "list of strings");
+ if (SCM_STRING_LENGTH (elt) > max_ext_len)
+ max_ext_len = SCM_STRING_LENGTH (elt);
+ }
+ }
+
+ SCM_DEFER_INTS;
+
+ { /* scope */
+ SCM result = SCM_BOOL_F;
+ size_t buf_size = max_path_len + 1 + filename_len + max_ext_len + 1;
+ char *buf = scm_malloc (buf_size);
+
+ /* This simplifies the loop below a bit. */
+ if (SCM_NULL_OR_NIL_P (extensions))
+ extensions = scm_listofnullstr;
+
+ /* Try every path element. At this point, we know the path is a
+ proper list of strings. */
+ for (; !SCM_NULL_OR_NIL_P (path); path = SCM_CDR (path))
+ {
+ size_t len;
+ SCM dir = SCM_CAR (path);
+ SCM exts;
+
+ /* Concatenate the path name and the filename. */
+ len = SCM_STRING_LENGTH (dir);
+ memcpy (buf, SCM_STRING_CHARS (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_NULL_OR_NIL_P (exts); exts = SCM_CDR (exts))
+ {
+ SCM ext = SCM_CAR (exts);
+ size_t ext_len = SCM_STRING_LENGTH (ext);
+ struct stat mode;
+
+ /* Concatenate the extension. */
+ memcpy (buf + len, SCM_STRING_CHARS (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))
+ {
+ result = scm_mem2string (buf, len + ext_len);
+ goto end;
+ }
+ }
+ }
+
+ end:
+ free (buf);
+ SCM_ALLOW_INTS;
+ return result;
+ }
+}
+#undef FUNC_NAME
+
+
+/* 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 the file named @var{filename},\n"
+ "which must be readable by the current user. If @var{filename}\n"
+ "is found in the list of paths to search or is an absolute\n"
+ "pathname, return its full pathname. Otherwise, return\n"
+ "@code{#f}. Filenames may have any of the optional extensions\n"
+ "in the @code{%load-extensions} list; @code{%search-load-path}\n"
+ "will try each extension automatically.")
+#define FUNC_NAME s_scm_sys_search_load_path
+{
+ SCM path = *scm_loc_load_path;
+ SCM exts = *scm_loc_load_extensions;
+ SCM_VALIDATE_STRING (1, filename);
+
+ if (scm_ilength (path) < 0)
+ SCM_MISC_ERROR ("%load-path is not a proper list", SCM_EOL);
+ if (scm_ilength (exts) < 0)
+ SCM_MISC_ERROR ("%load-extension list is not a proper list", SCM_EOL);
+ 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 the file named @var{filename} and\n"
+ "load it into the top-level environment. If @var{filename} is a\n"
+ "relative pathname and is not found in the list of search paths,\n"
+ "an error is signalled.")
+#define FUNC_NAME s_scm_primitive_load_path
+{
+ SCM full_filename;
+
+ SCM_VALIDATE_STRING (1, filename);
+
+ full_filename = scm_sys_search_load_path (filename);
+
+ if (SCM_FALSEP (full_filename))
+ {
+ int absolute = (SCM_STRING_LENGTH (filename) >= 1
+ && SCM_STRING_CHARS (filename)[0] == '/');
+ SCM_MISC_ERROR ((absolute
+ ? "Unable to load file ~S"
+ : "Unable to find file ~S in load path"),
+ scm_list_1 (filename));
+ }
+
+ return scm_primitive_load (full_filename);
+}
+#undef FUNC_NAME
+
+SCM
+scm_c_primitive_load_path (const char *filename)
+{
+ return scm_primitive_load_path (scm_makfrom0str (filename));
+}
+
+\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_VARIABLE_LOC (scm_c_define ("%guile-build-info", SCM_EOL));
+ unsigned long i;
+
+ for (i = 0; i < (sizeof (info) / sizeof (info[0])); i++)
+ *loc = scm_acons (scm_str2symbol (info[i].name),
+ scm_makfrom0str (info[i].value),
+ *loc);
+}
+
+
+\f
+void
+scm_init_load ()
+{
+ scm_listofnullstr = scm_permanent_object (scm_list_1 (scm_nullstr));
+ scm_loc_load_path = SCM_VARIABLE_LOC (scm_c_define ("%load-path", SCM_EOL));
+ scm_loc_load_extensions
+ = SCM_VARIABLE_LOC (scm_c_define ("%load-extensions",
+ scm_list_2 (scm_makfrom0str (".scm"),
+ scm_nullstr)));
+ scm_loc_load_hook = SCM_VARIABLE_LOC (scm_c_define ("%load-hook", SCM_BOOL_F));
+
+ init_build_info ();
+
+#include "libguile/load.x"
+}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff