libguile/gh_init.c

   1 /*      Copyright (C) 1995,1996,1997 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
  15  * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  16  * Boston, MA 02111-1307 USA
  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.
  40  * If you do not wish that, delete this exception notice.  */
  41 \f
  42
  43 /* Guile high level (gh_) interface, initialization-related stuff */
  44
  45 #include <stdio.h>
  46
  47 #include <gh.h>
  48
  49 typedef void (*main_prog_t) (int argc, char **argv);
  50 typedef void (*repl_prog_t) (int argc, char **argv);
  51
  52 /* This function takes care of all real GH initialization.  Since it's
  53    called by scm_boot_guile, it can safely work with heap objects, or
  54    call functions that do so.  */
  55 static void
  56 gh_launch_pad (void *closure, int argc, char **argv)
  57 {
  58   main_prog_t c_main_prog = (main_prog_t) closure;
  59
  60 /*   gh_eval_str ("(primitive-load-path \"ice-9/boot-9.scm\")"); */
  61   c_main_prog (argc, argv);
  62   exit (0);
  63 }
  64
  65 /* starts up the Scheme interpreter, and stays in it.  c_main_prog()
  66    is the address of the user's main program, since gh_enter() never
  67    returns. */
  68 void
  69 gh_enter (int argc, char *argv[], main_prog_t c_main_prog)
  70 {
  71   scm_boot_guile (argc, argv, gh_launch_pad, (void *) c_main_prog);
  72   /* never returns */
  73 }
  74
  75 /* offer a REPL to the C programmer; for now I just invoke the ice-9
  76    REPL that is written in Scheme */
  77 void
  78 gh_repl (int argc, char *argv[])
  79 {
  80 /*   gh_eval_str ("(top-repl)"); */
  81   scm_shell (argc, argv);
  82 }
  83
  84 /* libguile programmers need exception handling mechanisms; here is
  85    the recommended way of doing it with the gh_ interface */
  86
  87 /* gh_catch() -- set up an exception handler for a particular type of
  88    error (or any thrown error if tag is SCM_BOOL_T); see
  89    ../libguile/throw.c for the comments explaining scm_internal_catch */
  90 SCM
  91 gh_catch (SCM tag, scm_catch_body_t body, void *body_data,
  92           scm_catch_handler_t handler, void *handler_data)
  93 {
  94   return scm_internal_catch (tag, body, body_data, handler, handler_data);
  95 }
  96
  97 SCM
  98 gh_standard_handler (void *data, SCM tag, SCM throw_args)
  99 {
 100   fprintf (stderr, "\nJust got an error; tag is\n        ");
 101   scm_display (tag, scm_current_output_port ());
 102   scm_newline (scm_current_output_port ());
 103   scm_newline (scm_current_output_port ());
 104
 105   return SCM_BOOL_F;
 106 }