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/* Copyright (C) 1995,1996,1998,1999,2000,2001, 2004, 2006 Free Software Foundation, Inc.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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#include "libguile/_scm.h"
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#include "libguile/libpath.h"
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#include "libguile/fports.h"
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#include "libguile/read.h"
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#include "libguile/eval.h"
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#include "libguile/throw.h"
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#include "libguile/alist.h"
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#include "libguile/dynwind.h"
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#include "libguile/root.h"
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#include "libguile/strings.h"
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#include "libguile/modules.h"
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#include "libguile/lang.h"
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#include "libguile/chars.h"
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#include "libguile/srfi-13.h"
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#include "libguile/validate.h"
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#include "libguile/load.h"
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#include "libguile/fluids.h"
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#include <sys/types.h>
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#endif /* HAVE_UNISTD_H */
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/* Loading a file, given an absolute filename. */
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/* Hook to run when we load a file, perhaps to announce the fact somewhere.
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Applied to the full name of the file. */
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static SCM *scm_loc_load_hook;
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/* The current reader (a fluid). */
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static SCM the_reader = SCM_BOOL_F;
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static size_t the_reader_fluid_num = 0;
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SCM_DEFINE (scm_primitive_load, "primitive-load", 1, 0, 0,
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"Load the file named @var{filename} and evaluate its contents in\n"
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"the top-level environment. The load paths are not searched;\n"
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"@var{filename} must either be a full pathname or be a pathname\n"
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"relative to the current directory. If the variable\n"
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"@code{%load-hook} is defined, it should be bound to a procedure\n"
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"that will be called before any code is loaded. See the\n"
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"documentation for @code{%load-hook} later in this section.")
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#define FUNC_NAME s_scm_primitive_load
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SCM hook = *scm_loc_load_hook;
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SCM_VALIDATE_STRING (1, filename);
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if (scm_is_true (hook) && scm_is_false (scm_procedure_p (hook)))
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SCM_MISC_ERROR ("value of %load-hook is neither a procedure nor #f",
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if (!scm_is_false (hook))
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scm_call_1 (hook, filename);
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SCM port = scm_open_file (filename, scm_from_locale_string ("r"));
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scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE);
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scm_i_dynwind_current_load_port (port);
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/* Lookup and use the current reader to read the next
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reader = SCM_FAST_FLUID_REF (the_reader_fluid_num);
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if (reader == SCM_BOOL_F)
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form = scm_read (port);
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form = scm_call_1 (reader, port);
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if (SCM_EOF_OBJECT_P (form))
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scm_primitive_eval_x (form);
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scm_close_port (port);
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return SCM_UNSPECIFIED;
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scm_c_primitive_load (const char *filename)
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return scm_primitive_load (scm_from_locale_string (filename));
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/* Builtin path to scheme library files. */
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#ifdef SCM_PKGDATA_DIR
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SCM_DEFINE (scm_sys_package_data_dir, "%package-data-dir", 0, 0, 0,
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"Return the name of the directory where Scheme packages, modules and\n"
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"libraries are kept. On most Unix systems, this will be\n"
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"@samp{/usr/local/share/guile}.")
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#define FUNC_NAME s_scm_sys_package_data_dir
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return scm_from_locale_string (SCM_PKGDATA_DIR);
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#endif /* SCM_PKGDATA_DIR */
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#ifdef SCM_LIBRARY_DIR
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SCM_DEFINE (scm_sys_library_dir, "%library-dir", 0,0,0,
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"Return the directory where the Guile Scheme library files are installed.\n"
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"E.g., may return \"/usr/share/guile/1.3.5\".")
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#define FUNC_NAME s_scm_sys_library_dir
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return scm_from_locale_string (SCM_LIBRARY_DIR);
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#endif /* SCM_LIBRARY_DIR */
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SCM_DEFINE (scm_sys_site_dir, "%site-dir", 0,0,0,
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"Return the directory where the Guile site files are installed.\n"
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"E.g., may return \"/usr/share/guile/site\".")
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#define FUNC_NAME s_scm_sys_site_dir
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return scm_from_locale_string (SCM_SITE_DIR);
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#endif /* SCM_SITE_DIR */
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/* Initializing the load path, and searching it. */
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/* List of names of directories we search for files to load. */
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static SCM *scm_loc_load_path;
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/* List of extensions we try adding to the filenames. */
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static SCM *scm_loc_load_extensions;
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SCM_DEFINE (scm_parse_path, "parse-path", 1, 1, 0,
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(SCM path, SCM tail),
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"Parse @var{path}, which is expected to be a colon-separated\n"
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"string, into a list and return the resulting list with\n"
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"@var{tail} appended. If @var{path} is @code{#f}, @var{tail}\n"
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#define FUNC_NAME s_scm_parse_path
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SCM sep = SCM_MAKE_CHAR (';');
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SCM sep = SCM_MAKE_CHAR (':');
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if (SCM_UNBNDP (tail))
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return (scm_is_false (path)
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: scm_append_x (scm_list_2 (scm_string_split (path, sep), tail)));
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/* Initialize the global variable %load-path, given the value of the
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SCM_SITE_DIR and SCM_LIBRARY_DIR preprocessor symbols and the
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GUILE_LOAD_PATH environment variable. */
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scm_init_load_path ()
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#ifdef SCM_LIBRARY_DIR
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path = scm_list_3 (scm_from_locale_string (SCM_SITE_DIR),
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scm_from_locale_string (SCM_LIBRARY_DIR),
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scm_from_locale_string (SCM_PKGDATA_DIR));
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#endif /* SCM_LIBRARY_DIR */
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env = getenv ("GUILE_LOAD_PATH");
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path = scm_parse_path (scm_from_locale_string (env), path);
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*scm_loc_load_path = path;
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SCM scm_listofnullstr;
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/* Utility functions for assembling C strings in a buffer.
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stringbuf_free (void *data)
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struct stringbuf *buf = (struct stringbuf *)data;
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stringbuf_grow (struct stringbuf *buf)
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size_t ptroff = buf->ptr - buf->buf;
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buf->buf = scm_realloc (buf->buf, buf->buf_len);
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buf->ptr = buf->buf + ptroff;
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stringbuf_cat_locale_string (struct stringbuf *buf, SCM str)
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size_t max_len = buf->buf_len - (buf->ptr - buf->buf) - 1;
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size_t len = scm_to_locale_stringbuf (str, buf->ptr, max_len);
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/* buffer is too small, double its size and try again.
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stringbuf_grow (buf);
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stringbuf_cat_locale_string (buf, str);
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/* string fits, terminate it and check for embedded '\0'.
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buf->ptr[len] = '\0';
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if (strlen (buf->ptr) != len)
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scm_misc_error (NULL,
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"string contains #\\nul character: ~S",
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stringbuf_cat (struct stringbuf *buf, char *str)
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size_t max_len = buf->buf_len - (buf->ptr - buf->buf) - 1;
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size_t len = strlen (str);
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/* buffer is too small, double its size and try again.
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stringbuf_grow (buf);
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stringbuf_cat (buf, str);
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/* string fits, copy it into buffer.
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strcpy (buf->ptr, str);
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/* Search PATH for a directory containing a file named FILENAME.
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The file must be readable, and not a directory.
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If we find one, return its full filename; otherwise, return #f.
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If FILENAME is absolute, return it unchanged.
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If given, EXTENSIONS is a list of strings; for each directory
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in PATH, we search for FILENAME concatenated with each EXTENSION. */
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SCM_DEFINE (scm_search_path, "search-path", 2, 1, 0,
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(SCM path, SCM filename, SCM extensions),
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"Search @var{path} for a directory containing a file named\n"
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"@var{filename}. The file must be readable, and not a directory.\n"
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"If we find one, return its full filename; otherwise, return\n"
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"@code{#f}. If @var{filename} is absolute, return it unchanged.\n"
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"If given, @var{extensions} is a list of strings; for each\n"
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"directory in @var{path}, we search for @var{filename}\n"
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"concatenated with each @var{extension}.")
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#define FUNC_NAME s_scm_search_path
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struct stringbuf buf;
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char *filename_chars;
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SCM result = SCM_BOOL_F;
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if (SCM_UNBNDP (extensions))
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extensions = SCM_EOL;
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scm_dynwind_begin (0);
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filename_chars = scm_to_locale_string (filename);
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filename_len = strlen (filename_chars);
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scm_dynwind_free (filename_chars);
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/* If FILENAME is absolute, return it unchanged. */
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if (((filename_len >= 1) &&
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(filename_chars[0] == '/' || filename_chars[0] == '\\')) ||
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((filename_len >= 3) && filename_chars[1] == ':' &&
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((filename_chars[0] >= 'a' && filename_chars[0] <= 'z') ||
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(filename_chars[0] >= 'A' && filename_chars[0] <= 'Z')) &&
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(filename_chars[2] == '/' || filename_chars[2] == '\\')))
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if (filename_len >= 1 && filename_chars[0] == '/')
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/* If FILENAME has an extension, don't try to add EXTENSIONS to it. */
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for (endp = filename_chars + filename_len - 1;
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endp >= filename_chars;
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/* This filename already has an extension, so cancel the
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list of extensions. */
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extensions = SCM_EOL;
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else if (*endp == '/' || *endp == '\\')
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else if (*endp == '/')
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/* This filename has no extension, so keep the current list
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/* This simplifies the loop below a bit.
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if (scm_is_null (extensions))
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extensions = scm_listofnullstr;
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buf.buf = scm_malloc (buf.buf_len);
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scm_dynwind_unwind_handler (stringbuf_free, &buf, SCM_F_WIND_EXPLICITLY);
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/* Try every path element.
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for (; scm_is_pair (path); path = SCM_CDR (path))
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SCM dir = SCM_CAR (path);
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stringbuf_cat_locale_string (&buf, dir);
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/* Concatenate the path name and the filename. */
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if ((buf.ptr > buf.buf) && (buf.ptr[-1] != '/') && (buf.ptr[-1] != '\\'))
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if ((buf.ptr > buf.buf) && (buf.ptr[-1] != '/'))
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stringbuf_cat (&buf, "/");
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stringbuf_cat (&buf, filename_chars);
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sans_ext_len = buf.ptr - buf.buf;
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/* Try every extension. */
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for (exts = extensions; scm_is_pair (exts); exts = SCM_CDR (exts))
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SCM ext = SCM_CAR (exts);
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buf.ptr = buf.buf + sans_ext_len;
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stringbuf_cat_locale_string (&buf, ext);
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/* If the file exists at all, we should return it. If the
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file is inaccessible, then that's an error. */
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if (stat (buf.buf, &mode) == 0
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&& ! (mode.st_mode & S_IFDIR))
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result = scm_from_locale_string (buf.buf);
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if (!SCM_NULL_OR_NIL_P (exts))
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scm_wrong_type_arg_msg (NULL, 0, extensions, "proper list");
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if (!SCM_NULL_OR_NIL_P (path))
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scm_wrong_type_arg_msg (NULL, 0, path, "proper list");
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/* Search %load-path for a directory containing a file named FILENAME.
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The file must be readable, and not a directory.
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If we find one, return its full filename; otherwise, return #f.
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If FILENAME is absolute, return it unchanged. */
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SCM_DEFINE (scm_sys_search_load_path, "%search-load-path", 1, 0, 0,
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"Search @var{%load-path} for the file named @var{filename},\n"
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"which must be readable by the current user. If @var{filename}\n"
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"is found in the list of paths to search or is an absolute\n"
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"pathname, return its full pathname. Otherwise, return\n"
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"@code{#f}. Filenames may have any of the optional extensions\n"
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"in the @code{%load-extensions} list; @code{%search-load-path}\n"
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"will try each extension automatically.")
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#define FUNC_NAME s_scm_sys_search_load_path
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SCM path = *scm_loc_load_path;
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SCM exts = *scm_loc_load_extensions;
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SCM_VALIDATE_STRING (1, filename);
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if (scm_ilength (path) < 0)
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SCM_MISC_ERROR ("%load-path is not a proper list", SCM_EOL);
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if (scm_ilength (exts) < 0)
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SCM_MISC_ERROR ("%load-extension list is not a proper list", SCM_EOL);
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return scm_search_path (path, filename, exts);
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SCM_DEFINE (scm_primitive_load_path, "primitive-load-path", 1, 0, 0,
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"Search @var{%load-path} for the file named @var{filename} and\n"
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"load it into the top-level environment. If @var{filename} is a\n"
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"relative pathname and is not found in the list of search paths,\n"
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"an error is signalled.")
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#define FUNC_NAME s_scm_primitive_load_path
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full_filename = scm_sys_search_load_path (filename);
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if (scm_is_false (full_filename))
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SCM_MISC_ERROR ("Unable to find file ~S in load path",
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scm_list_1 (filename));
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return scm_primitive_load (full_filename);
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scm_c_primitive_load_path (const char *filename)
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return scm_primitive_load_path (scm_from_locale_string (filename));
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/* Information about the build environment. */
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/* Initialize the scheme variable %guile-build-info, based on data
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provided by the Makefile, via libpath.h. */
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static struct { char *name; char *value; } info[] = SCM_BUILD_INFO;
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SCM *loc = SCM_VARIABLE_LOC (scm_c_define ("%guile-build-info", SCM_EOL));
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for (i = 0; i < (sizeof (info) / sizeof (info[0])); i++)
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SCM key = scm_from_locale_symbol (info[i].name);
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SCM val = scm_from_locale_string (info[i].value);
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*loc = scm_acons (key, val, *loc);
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scm_listofnullstr = scm_permanent_object (scm_list_1 (scm_nullstr));
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scm_loc_load_path = SCM_VARIABLE_LOC (scm_c_define ("%load-path", SCM_EOL));
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scm_loc_load_extensions
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= SCM_VARIABLE_LOC (scm_c_define ("%load-extensions",
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scm_list_2 (scm_from_locale_string (".scm"),
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scm_loc_load_hook = SCM_VARIABLE_LOC (scm_c_define ("%load-hook", SCM_BOOL_F));
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the_reader = scm_make_fluid ();
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the_reader_fluid_num = SCM_FLUID_NUM (the_reader);
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SCM_FAST_FLUID_SET_X (the_reader_fluid_num, SCM_BOOL_F);
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scm_c_define("current-reader", the_reader);
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#include "libguile/load.x"
added
removed
libguile/load.c
