libguile/gh_init.c

   1 /* Copyright (C) 1995,1996,1997,2000,2001 Free Software Foundation, Inc.
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library 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 GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  16  */
  17 \f
  18
  19 /* Guile high level (gh_) interface, initialization-related stuff */
  20
  21 #include <stdio.h>
  22
  23 #include "libguile/gh.h"
  24
  25 typedef void (*main_prog_t) (int argc, char **argv);
  26 typedef void (*repl_prog_t) (int argc, char **argv);
  27
  28 /* This function takes care of all real GH initialization.  Since it's
  29    called by scm_boot_guile, it can safely work with heap objects, or
  30    call functions that do so.  */
  31 static void
  32 gh_launch_pad (void *closure, int argc, char **argv)
  33 {
  34   main_prog_t c_main_prog = (main_prog_t) closure;
  35
  36   c_main_prog (argc, argv);
  37   exit (0);
  38 }
  39
  40 /* starts up the Scheme interpreter, and stays in it.  c_main_prog()
  41    is the address of the user's main program, since gh_enter() never
  42    returns. */
  43 void
  44 gh_enter (int argc, char *argv[], main_prog_t c_main_prog)
  45 {
  46   scm_boot_guile (argc, argv, gh_launch_pad, (void *) c_main_prog);
  47   /* never returns */
  48 }
  49
  50 /* offer a REPL to the C programmer; for now I just invoke the ice-9
  51    REPL that is written in Scheme */
  52 void
  53 gh_repl (int argc, char *argv[])
  54 {
  55 /*   gh_eval_str ("(top-repl)"); */
  56   scm_shell (argc, argv);
  57 }
  58
  59 /* libguile programmers need exception handling mechanisms; here is
  60    the recommended way of doing it with the gh_ interface */
  61
  62 /* gh_catch() -- set up an exception handler for a particular type of
  63    error (or any thrown error if tag is SCM_BOOL_T); see
  64    ../libguile/throw.c for the comments explaining scm_internal_catch */
  65 SCM
  66 gh_catch (SCM tag, scm_t_catch_body body, void *body_data,
  67           scm_t_catch_handler handler, void *handler_data)
  68 {
  69   return scm_internal_catch (tag, body, body_data, handler, handler_data);
  70 }
  71
  72 SCM
  73 gh_standard_handler (void *data SCM_UNUSED, SCM tag, SCM throw_args SCM_UNUSED)
  74 {
  75   fprintf (stderr, "\nJust got an error; tag is\n        ");
  76   scm_display (tag, scm_current_output_port ());
  77   scm_newline (scm_current_output_port ());
  78   scm_newline (scm_current_output_port ());
  79
  80   return SCM_BOOL_F;
  81 }
  82
  83 /*
  84   Local Variables:
  85   c-file-style: "gnu"
  86   End:
  87 */