libguile/gh_init.c

   1 /* Copyright (C) 1995,1996,1997,2000,2001, 2006, 2008 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 #ifdef HAVE_CONFIG_H
  19 # include <config.h>
  20 #endif
  21
  22 /* Guile high level (gh_) interface, initialization-related stuff */
  23
  24 #include <stdio.h>
  25
  26 #include "libguile/gh.h"
  27
  28 #if SCM_ENABLE_DEPRECATED
  29
  30 typedef void (*main_prog_t) (int argc, char **argv);
  31 typedef void (*repl_prog_t) (int argc, char **argv);
  32
  33 /* This function takes care of all real GH initialization.  Since it's
  34    called by scm_boot_guile, it can safely work with heap objects, or
  35    call functions that do so.  */
  36 static void
  37 gh_launch_pad (void *closure, int argc, char **argv)
  38 {
  39   main_prog_t c_main_prog = (main_prog_t) closure;
  40
  41   c_main_prog (argc, argv);
  42   exit (0);
  43 }
  44
  45 /* starts up the Scheme interpreter, and stays in it.  c_main_prog()
  46    is the address of the user's main program, since gh_enter() never
  47    returns. */
  48 void
  49 gh_enter (int argc, char *argv[], main_prog_t c_main_prog)
  50 {
  51   scm_boot_guile (argc, argv, gh_launch_pad, (void *) c_main_prog);
  52   /* never returns */
  53 }
  54
  55 /* offer a REPL to the C programmer; for now I just invoke the ice-9
  56    REPL that is written in Scheme */
  57 void
  58 gh_repl (int argc, char *argv[])
  59 {
  60 /*   gh_eval_str ("(top-repl)"); */
  61   scm_shell (argc, argv);
  62 }
  63
  64 /* libguile programmers need exception handling mechanisms; here is
  65    the recommended way of doing it with the gh_ interface */
  66
  67 /* gh_catch() -- set up an exception handler for a particular type of
  68    error (or any thrown error if tag is SCM_BOOL_T); see
  69    ../libguile/throw.c for the comments explaining scm_internal_catch */
  70 SCM
  71 gh_catch (SCM tag, scm_t_catch_body body, void *body_data,
  72           scm_t_catch_handler handler, void *handler_data)
  73 {
  74   return scm_internal_catch (tag, body, body_data, handler, handler_data);
  75 }
  76
  77 SCM
  78 gh_standard_handler (void *data SCM_UNUSED, SCM tag, SCM throw_args SCM_UNUSED)
  79 {
  80   fprintf (stderr, "\nJust got an error; tag is\n        ");
  81   scm_display (tag, scm_current_output_port ());
  82   scm_newline (scm_current_output_port ());
  83   scm_newline (scm_current_output_port ());
  84
  85   return SCM_BOOL_F;
  86 }
  87
  88 #endif /* SCM_ENABLE_DEPRECATED */
  89
  90 /*
  91   Local Variables:
  92   c-file-style: "gnu"
  93   End:
  94 */