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more robust fallback error printer

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* libguile/throw.c (pre_init_throw): Deal with errors printing the
  exception.
This commit is contained in:
Andy Wingo 2011-02-09 23:34:36 +01:00
parent eaf2d3f253
commit cd4f274c62
1 changed files with 22 additions and 2 deletions
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24
libguile/throw.c
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@ -566,8 +566,28 @@ pre_init_throw (SCM k, SCM args)
return scm_at_abort (sym_pre_init_catch_tag, scm_cons (k, args));
else
{
fprintf (stderr, "Throw without catch before boot:\n");
scm_handle_by_message_noexit (NULL, k, args);
static int error_printing_error = 0;
static int error_printing_fallback = 0;
if (error_printing_fallback)
fprintf (stderr, "\nFailed to print exception.\n");
else if (error_printing_error)
{
fprintf (stderr, "\nError while printing exception:\n");
error_printing_fallback = 1;
fprintf (stderr, "Key: ");
scm_write (k, scm_current_error_port ());
fprintf (stderr, ", args: ");
scm_write (args, scm_current_error_port ());
scm_newline (scm_current_error_port ());
}
else
{
fprintf (stderr, "Throw without catch before boot:\n");
error_printing_error = 1;
scm_handle_by_message_noexit (NULL, k, args);
}
fprintf (stderr, "Aborting.\n");
abort ();
return SCM_BOOL_F; /* not reached */