libguile/gh_init.c

   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
  15  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  16  *
  17  * As a special exception, the Free Software Foundation gives permission
  18  * for additional uses of the text contained in its release of GUILE.
  19  *
  20  * The exception is that, if you link the GUILE library with other files
  21  * to produce an executable, this does not by itself cause the
  22  * resulting executable to be covered by the GNU General Public License.
  23  * Your use of that executable is in no way restricted on account of
  24  * linking the GUILE library code into it.
  25  *
  26  * This exception does not however invalidate any other reasons why
  27  * the executable file might be covered by the GNU General Public License.
  28  *
  29  * This exception applies only to the code released by the
  30  * Free Software Foundation under the name GUILE.  If you copy
  31  * code from other Free Software Foundation releases into a copy of
  32  * GUILE, as the General Public License permits, the exception does
  33  * not apply to the code that you add in this way.  To avoid misleading
  34  * anyone as to the status of such modified files, you must delete
  35  * this exception notice from them.
  36  *
  37  * If you write modifications of your own for GUILE, it is your choice
  38  * whether to permit this exception to apply to your modifications.
  39  * If you do not wish that, delete this exception notice.
  40  */
  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
  66 /* starts up the Scheme interpreter, and stays in it.  c_main_prog()
  67    is the address of the user's main program, since gh_enter() never
  68    returns. */
  69 void
  70 gh_enter (int argc, char *argv[], main_prog_t c_main_prog)
  71 {
  72   scm_boot_guile (argc, argv, gh_launch_pad, c_main_prog);
  73   /* never returns */
  74 }
  75
  76 /* offer a REPL to the C programmer; for now I just invoke the ice-9
  77    REPL that is written in Scheme */
  78 void
  79 gh_repl ()
  80 {
  81 /*   gh_eval_str("(primitive-load-path \"ice-9/boot-9.scm\")"); */
  82   gh_eval_str ("(top-repl)");
  83 }
  84
  85 /* libguile programmers need exception handling mechanisms; here is
  86    the recommended way of doing it with the gh_ interface */
  87
  88 /* gh_catch() -- set up an exception handler for a particular type of
  89    error (or any thrown error if tag is SCM_BOOL_T); see
  90    ../libguile/throw.c for the comments explaining scm_internal_catch */
  91 SCM
  92 gh_catch (SCM tag, scm_catch_body_t body, void *body_data,
  93           scm_catch_handler_t handler, void *handler_data)
  94 {
  95   return scm_internal_catch (tag, body, body_data, handler, handler_data);
  96 }
  97
  98 SCM
  99 gh_standard_handler (void *data, SCM tag, SCM throw_args)
 100 {
 101   fprintf (stderr, "\nJust got an error; tag is\n        ");
 102   scm_display (tag, scm_current_output_port ());
 103   scm_newline (scm_current_output_port ());
 104   scm_newline (scm_current_output_port ());
 105
 106   return SCM_BOOL_F;
 107 }