[bpt/guile.git] / libguile / load.c

/*	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 "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;

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 form, port;
    port = scm_open_file (filename,
			  scm_makfromstr ("r", (scm_sizet) sizeof (char), 0));
    while (1)
      {
	form = scm_read (port);
	if (SCM_EOF_OBJECT_P (form))
	  break;
	scm_eval_x (form);
      }
    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_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;
}


/* 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_parse_path (p, path);
      }
  }

  path = scm_parse_path (getenv ("GUILE_LOAD_PATH"), path);

  *scm_loc_load_path = path;
}


/* 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;
  char *buf;
  int filename_len;
  int max_path_len;
  int max_ext_len;

  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);
  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,
		    "load path is not a list of strings",
		    s_sys_search_load_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 = exts; SCM_NIMP (walk); walk = SCM_CDR (walk))
      {
	SCM elt = SCM_CAR (walk);
	SCM_ASSERT (SCM_NIMP (elt) && SCM_ROSTRINGP (elt), elt,
		    "load extension list is not a list of strings",
		    s_sys_search_load_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_sys_search_load_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);

      /* Try every extension.  At this point, we know it's a proper
         list of strings.  */
      for (exts = *scm_loc_load_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;
}


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_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"
}
Commit	Line	Data
0f2d19dd JB	1	/* Copyright (C) 1995,1996 Free Software Foundation, Inc.
	2	*
	3	* This program is free software; you can redistribute it and/or modify
	4	* it under the terms of the GNU General Public License as published by
	5	* the Free Software Foundation; either version 2, or (at your option)
	6	* any later version.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* along with this software; see the file COPYING. If not, write to
82892bed JB	15	* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
82892bed JB	16	* Boston, MA 02111-1307 USA
0f2d19dd JB	17	*
	18	* As a special exception, the Free Software Foundation gives permission
	19	* for additional uses of the text contained in its release of GUILE.
	20	*
	21	* The exception is that, if you link the GUILE library with other files
	22	* to produce an executable, this does not by itself cause the
	23	* resulting executable to be covered by the GNU General Public License.
	24	* Your use of that executable is in no way restricted on account of
	25	* linking the GUILE library code into it.
	26	*
	27	* This exception does not however invalidate any other reasons why
	28	* the executable file might be covered by the GNU General Public License.
	29	*
	30	* This exception applies only to the code released by the
	31	* Free Software Foundation under the name GUILE. If you copy
	32	* code from other Free Software Foundation releases into a copy of
	33	* GUILE, as the General Public License permits, the exception does
	34	* not apply to the code that you add in this way. To avoid misleading
	35	* anyone as to the status of such modified files, you must delete
	36	* this exception notice from them.
	37	*
	38	* If you write modifications of your own for GUILE, it is your choice
	39	* whether to permit this exception to apply to your modifications.
82892bed	40	* If you do not wish that, delete this exception notice. */
0f2d19dd JB	41	\f
	42
	43	#include <stdio.h>
	44	#include "_scm.h"
06721500	45	#include "libpath.h"
20e6290e JB	46	#include "fports.h"
	47	#include "read.h"
	48	#include "eval.h"
b35d06a4	49	#include "throw.h"
e151bee6	50	#include "alist.h"
20e6290e JB	51
20e6290e JB	52	#include "load.h"
06721500 JB	53
	54	#include <sys/types.h>
	55	#include <sys/stat.h>
	56
	57	#ifdef HAVE_UNISTD_H
	58	#include <unistd.h>
	59	#endif /* HAVE_UNISTD_H */
	60
	61	#ifndef R_OK
	62	#define R_OK 4
	63	#endif
0f2d19dd JB	64
0f2d19dd JB	65	\f
06721500	66	/* Loading a file, given an absolute filename. */
0f2d19dd	67
26544b96 JB	68	/* Hook to run when we load a file, perhaps to announce the fact somewhere.
	69	Applied to the full name of the file. */
	70	static SCM *scm_loc_load_hook;
	71
deca31e1	72	SCM_PROC(s_primitive_load, "primitive-load", 1, 0, 0, scm_primitive_load);
0f2d19dd	73	SCM
deca31e1	74	scm_primitive_load (filename)
0f2d19dd	75	SCM filename;
0f2d19dd	76	{
26544b96	77	SCM hook = *scm_loc_load_hook;
06721500	78	SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename,
523f5266	79	SCM_ARG1, s_primitive_load);
26544b96 JB	80	SCM_ASSERT (hook == SCM_BOOL_F
	81	\|\| (scm_procedure_p (hook) == SCM_BOOL_T),
	82	hook, "value of %load-hook is neither a procedure nor #f",
	83	s_primitive_load);
	84
	85	if (hook != SCM_BOOL_F)
	86	scm_apply (hook, scm_listify (filename, SCM_UNDEFINED), SCM_EOL);
	87
0f2d19dd JB	88	{
	89	SCM form, port;
	90	port = scm_open_file (filename,
	91	scm_makfromstr ("r", (scm_sizet) sizeof (char), 0));
0f2d19dd JB	92	while (1)
0f2d19dd JB	93	{
deca31e1	94	form = scm_read (port);
0c32d76c	95	if (SCM_EOF_OBJECT_P (form))
0f2d19dd JB	96	break;
	97	scm_eval_x (form);
	98	}
	99	scm_close_port (port);
	100	}
b59b97ba	101	return SCM_UNSPECIFIED;
0f2d19dd JB	102	}
	103
	104	\f
3feedb00 MD	105	/* Builtin path to scheme library files. */
	106	#ifdef SCM_PKGDATA_DIR
	107	SCM_PROC (s_sys_package_data_dir, "%package-data-dir", 0, 0, 0, scm_sys_package_data_dir);
	108	SCM
	109	scm_sys_package_data_dir ()
	110	{
	111	return scm_makfrom0str (SCM_PKGDATA_DIR);
	112	}
	113	#endif /* SCM_PKGDATA_DIR */
	114
	115	\f
06721500	116	/* Initializing the load path, and searching it. */
0f2d19dd	117
26544b96	118	/* List of names of directories we search for files to load. */
06721500 JB	119	static SCM *scm_loc_load_path;
06721500 JB	120
26544b96 JB	121	/* List of extensions we try adding to the filenames. */
	122	static SCM *scm_loc_load_extensions;
	123
01cddfc1 JB	124
	125	/* Parse the null-terminated string PATH as if it were a standard path
	126	environment variable (i.e. a colon-separated list of strings), and
	127	prepend the elements to TAIL. */
	128	SCM
	129	scm_parse_path (char *path, SCM tail)
	130	{
	131	if (path && path[0] != '\0')
	132	{
	133	char scan, elt_end;
	134
	135	/* Scan backwards from the end of the string, to help
	136	construct the list in the right order. */
	137	scan = elt_end = path + strlen (path);
	138	do {
	139	/* Scan back to the beginning of the current element. */
	140	do scan--;
	141	while (scan >= path && *scan != ':');
	142	tail = scm_cons (scm_makfromstr (scan + 1, elt_end - (scan + 1), 0),
	143	tail);
	144	elt_end = scan;
	145	} while (scan >= path);
	146	}
	147
	148	return tail;
	149	}
	150
	151
06721500	152	/* Initialize the global variable %load-path, given the value of the
3feedb00	153	SCM_SITE_DIR and SCM_LIBRARY_DIR preprocessor symbols and the
01cddfc1	154	GUILE_LOAD_PATH environment variable. */
0f2d19dd	155	void
06721500 JB	156	scm_init_load_path ()
	157	{
	158	SCM path = SCM_EOL;
	159
3feedb00	160	#ifdef SCM_LIBRARY_DIR
55407879 TP	161	path = scm_listify (scm_makfrom0str (SCM_SITE_DIR),
	162	scm_makfrom0str (SCM_LIBRARY_DIR),
	163	scm_makfrom0str (SCM_PKGDATA_DIR),
	164	SCM_UNDEFINED);
3feedb00	165	#endif /* SCM_LIBRARY_DIR */
06721500	166
01cddfc1 JB	167	/* For compatibility, we still check this, but give a warning. */
	168	{
	169	char *p = getenv ("SCHEME_LOAD_PATH");
	170	if (p && p[0] != '\0')
06721500	171	{
01cddfc1 JB	172	fprintf (stderr, "guile: warning: SCHEME_LOAD_PATH variable will be"
	173	" removed by Guile 1.4;\n"
	174	" use GUILE_LOAD_PATH instead\n");
	175	path = scm_parse_path (p, path);
06721500 JB	176	}
	177	}
	178
01cddfc1 JB	179	path = scm_parse_path (getenv ("GUILE_LOAD_PATH"), path);
01cddfc1 JB	180
06721500 JB	181	*scm_loc_load_path = path;
	182	}
	183
	184
	185	/* Search %load-path for a directory containing a file named FILENAME.
	186	The file must be readable, and not a directory.
26544b96 JB	187	If we find one, return its full filename; otherwise, return #f.
26544b96 JB	188	If FILENAME is absolute, return it unchanged. */
06721500 JB	189	SCM_PROC(s_sys_search_load_path, "%search-load-path", 1, 0, 0, scm_sys_search_load_path);
	190	SCM
	191	scm_sys_search_load_path (filename)
	192	SCM filename;
	193	{
	194	SCM path = *scm_loc_load_path;
26544b96	195	SCM exts = *scm_loc_load_extensions;
06721500	196	char *buf;
06721500	197	int filename_len;
26544b96 JB	198	int max_path_len;
26544b96 JB	199	int max_ext_len;
06721500 JB	200
	201	SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename,
	202	SCM_ARG1, s_sys_search_load_path);
26544b96 JB	203	SCM_ASSERT (scm_ilength (path) >= 0, path, "load path is not a proper list",
	204	s_sys_search_load_path);
	205	SCM_ASSERT (scm_ilength (exts) >= 0, exts,
	206	"load extension list is not a proper list",
	207	s_sys_search_load_path);
06721500 JB	208	filename_len = SCM_ROLENGTH (filename);
06721500 JB	209
26544b96 JB	210	/* If FILENAME is absolute, return it unchanged. */
	211	if (filename_len >= 1
	212	&& SCM_ROCHARS (filename)[0] == '/')
	213	return filename;
	214
	215	/* Find the length of the longest element of path. */
	216	{
	217	SCM walk;
	218
	219	max_path_len = 0;
	220	for (walk = path; SCM_NIMP (walk); walk = SCM_CDR (walk))
	221	{
	222	SCM elt = SCM_CAR (walk);
	223	SCM_ASSERT (SCM_NIMP (elt) && SCM_ROSTRINGP (elt), elt,
	224	"load path is not a list of strings",
	225	s_sys_search_load_path);
	226	if (SCM_LENGTH (elt) > max_path_len)
	227	max_path_len = SCM_LENGTH (elt);
	228	}
	229	}
	230
	231	/* Find the length of the longest element of the load extensions
	232	list. */
	233	{
	234	SCM walk;
	235
	236	max_ext_len = 0;
	237	for (walk = exts; SCM_NIMP (walk); walk = SCM_CDR (walk))
	238	{
	239	SCM elt = SCM_CAR (walk);
	240	SCM_ASSERT (SCM_NIMP (elt) && SCM_ROSTRINGP (elt), elt,
	241	"load extension list is not a list of strings",
	242	s_sys_search_load_path);
	243	if (SCM_LENGTH (elt) > max_ext_len)
	244	max_ext_len = SCM_LENGTH (elt);
	245	}
	246	}
	247
06721500 JB	248	SCM_DEFER_INTS;
06721500 JB	249
26544b96 JB	250	buf = scm_must_malloc (max_path_len + 1 + filename_len + max_ext_len + 1,
26544b96 JB	251	s_sys_search_load_path);
06721500	252
26544b96 JB	253	/* Try every path element. At this point, we know it's a proper
	254	list of strings. */
	255	for (; SCM_NIMP (path); path = SCM_CDR (path))
06721500	256	{
26544b96 JB	257	SCM path_elt = SCM_CAR (path);
	258
	259	/* Try every extension. At this point, we know it's a proper
	260	list of strings. */
	261	for (exts = *scm_loc_load_extensions;
	262	SCM_NIMP (exts);
	263	exts = SCM_CDR (exts))
06721500	264	{
26544b96 JB	265	SCM ext_elt = SCM_CAR (exts);
	266	int i;
	267
	268	/* Concatenate the path name, the filename, and the extension. */
	269	i = SCM_ROLENGTH (path_elt);
	270	memcpy (buf, SCM_ROCHARS (path_elt), i);
b35d06a4 MD	271	if (i >= 1 && buf[i - 1] != '/')
b35d06a4 MD	272	buf[i++] = '/';
26544b96 JB	273	memcpy (buf + i, SCM_ROCHARS (filename), filename_len);
	274	i += filename_len;
	275	memcpy (buf + i, SCM_ROCHARS (ext_elt), SCM_LENGTH (ext_elt));
	276	i += SCM_LENGTH (ext_elt);
	277	buf[i] = '\0';
06721500 JB	278
	279	{
	280	struct stat mode;
	281
	282	if (stat (buf, &mode) >= 0
	283	&& ! (mode.st_mode & S_IFDIR)
	284	&& access (buf, R_OK) == 0)
	285	{
26544b96	286	SCM result = scm_makfromstr (buf, i, 0);
06721500 JB	287	scm_must_free (buf);
	288	SCM_ALLOW_INTS;
	289	return result;
	290	}
	291	}
	292	}
06721500 JB	293	}
	294
	295	scm_must_free (buf);
	296	SCM_ALLOW_INTS;
	297	return SCM_BOOL_F;
	298	}
	299
	300
deca31e1	301	SCM_PROC(s_primitive_load_path, "primitive-load-path", 1, 0, 0, scm_primitive_load_path);
06721500	302	SCM
deca31e1	303	scm_primitive_load_path (filename)
06721500	304	SCM filename;
06721500	305	{
26544b96 JB	306	SCM full_filename;
	307
	308	SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename,
	309	SCM_ARG1, s_primitive_load_path);
	310
	311	full_filename = scm_sys_search_load_path (filename);
	312
dbece3a2 GH	313	if (SCM_FALSEP (full_filename))
dbece3a2 GH	314	{
26544b96 JB	315	int absolute = (SCM_LENGTH (filename) >= 1
26544b96 JB	316	&& SCM_ROCHARS (filename)[0] == '/');
523f5266	317	scm_misc_error (s_primitive_load_path,
26544b96 JB	318	(absolute
	319	? "Unable to load file %S"
	320	: "Unable to find file %S in load path"),
	321	scm_listify (filename, SCM_UNDEFINED));
dbece3a2	322	}
26544b96	323
deca31e1	324	return scm_primitive_load (full_filename);
06721500 JB	325	}
06721500 JB	326
b35d06a4 MD	327	/* The following function seems trivial - and indeed it is. Its
	328	* existence is motivated by its ability to evaluate expressions
	329	* without copying them first (as is done in "eval").
	330	*/
	331
	332	SCM_SYMBOL (scm_end_of_file_key, "end-of-file");
	333
deca31e1	334	SCM_PROC (s_read_and_eval_x, "read-and-eval!", 0, 1, 0, scm_read_and_eval_x);
b35d06a4 MD	335
b35d06a4 MD	336	SCM
deca31e1	337	scm_read_and_eval_x (port)
b35d06a4	338	SCM port;
b35d06a4	339	{
deca31e1	340	SCM form = scm_read (port);
0c32d76c	341	if (SCM_EOF_OBJECT_P (form))
b35d06a4 MD	342	scm_ithrow (scm_end_of_file_key, SCM_EOL, 1);
	343	return scm_eval_x (form);
	344	}
	345
06721500	346	\f
e151bee6	347	/* Information about the build environment. */
06721500	348
e151bee6 JB	349	/* Initialize the scheme variable %guile-build-info, based on data
	350	provided by the Makefile, via libpath.h. */
	351	static void
	352	init_build_info ()
	353	{
	354	static struct { char name; char value; } info[] = SCM_BUILD_INFO;
	355	SCM *loc = SCM_CDRLOC (scm_sysintern ("%guile-build-info", SCM_EOL));
	356	int i;
	357
	358	for (i = 0; i < (sizeof (info) / sizeof (info[0])); i++)
	359	*loc = scm_acons (SCM_CAR (scm_intern0 (info[i].name)),
	360	scm_makfrom0str (info[i].value),
	361	*loc);
	362	}
	363
	364
	365	\f
0f2d19dd JB	366	void
0f2d19dd JB	367	scm_init_load ()
0f2d19dd	368	{
25d8012c	369	scm_loc_load_path = SCM_CDRLOC(scm_sysintern("%load-path", SCM_EOL));
26544b96 JB	370	scm_loc_load_extensions
	371	= SCM_CDRLOC(scm_sysintern("%load-extensions",
	372	scm_listify (scm_makfrom0str (""),
	373	scm_makfrom0str (".scm"),
	374	SCM_UNDEFINED)));
	375	scm_loc_load_hook = SCM_CDRLOC(scm_sysintern("%load-hook", SCM_BOOL_F));
06721500	376
e151bee6 JB	377	init_build_info ();
e151bee6 JB	378
0f2d19dd JB	379	#include "load.x"
0f2d19dd JB	380	}