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/* 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
* 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. */
#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
/* 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) 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;
}
/* 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 */
/* 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 */
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, *endp;
int filename_len;
size_t max_path_len;
size_t max_ext_len;
SCM result = SCM_BOOL_F;
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_ROLENGTH (elt) > max_path_len)
max_path_len = SCM_ROLENGTH (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_ROLENGTH (elt) > max_ext_len)
max_ext_len = SCM_ROLENGTH (elt);
}
}
/* Remove the same extension that FILENAME already has. */
for (endp = SCM_ROCHARS (filename) + filename_len - 1;
endp > SCM_ROCHARS (filename) && *endp != '/'; endp--)
if (*endp == '.')
{
extensions = scm_delete (scm_makfromstr (endp, SCM_ROCHARS (filename)
+ filename_len - endp, 0),
extensions);
break;
}
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))
{
int len;
SCM dir = SCM_CAR (path), 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, SCM_ROCHARS (filename), filename_len);
endp = buf + len + filename_len;
/* 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 = SCM_CAR (exts);
struct stat mode;
/* Concatenate the extension. */
len = SCM_ROLENGTH (ext);
memcpy (endp, SCM_ROCHARS (ext), len);
*(endp + len) = '\0';
if (stat (buf, &mode) == 0
&& ! (mode.st_mode & S_IFDIR)
&& access (buf, R_OK) == 0)
{
result = scm_makfromstr (buf, endp + len - buf, 0);
goto end;
}
}
}
end:
scm_must_free (buf);
SCM_ALLOW_INTS;
return result;
}
/* 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_ROLENGTH (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);
}
/* 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);
}
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"),
scm_makfrom0str (""),
SCM_UNDEFINED)));
scm_loc_load_hook = SCM_CDRLOC (scm_sysintern ("%load-hook", SCM_BOOL_F));
init_build_info ();
#include "load.x"
}
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