/*	Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this software; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * As a special exception, the Free Software Foundation gives permission
 * for additional uses of the text contained in its release of GUILE.
 *
 * The exception is that, if you link the GUILE library with other files
 * to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the GUILE library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the
 * Free Software Foundation under the name GUILE.  If you copy
 * code from other Free Software Foundation releases into a copy of
 * GUILE, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for GUILE, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.  
 */


#include <stdio.h>
#include "_scm.h"
#include "pairs.h"
#include "genio.h"
#include "throw.h"

#include "error.h"

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif



/* {Errors and Exceptional Conditions}
 */


extern int errno;

void (*scm_error_callback) () = 0;

/* All errors should pass through here.  */
void
scm_error (key, subr, message, args, rest)
     SCM key;
     char *subr;
     char *message;
     SCM args;
     SCM rest;
{
  SCM arg_list;
  if (scm_error_callback)
    (*scm_error_callback) (key, subr, message, args, rest);

  arg_list = scm_listify (subr ? scm_makfrom0str (subr) : SCM_BOOL_F,
			  message ? scm_makfrom0str (message) : SCM_BOOL_F,
			  args,
			  rest,
			  SCM_UNDEFINED);
  scm_ithrow (key, arg_list, 1);
  
  /* No return, but just in case: */

  write (2, "unhandled system error", sizeof ("unhandled system error") - 1);
  exit (1);
}

/* Scheme interface to scm_error.  */
SCM_PROC(s_error_scm, "scm-error", 5, 0, 0, scm_error_scm);
SCM
scm_error_scm (key, subr, message, args, rest)
     SCM key;
     SCM subr;
     SCM message;
     SCM args;
     SCM rest;
{
  SCM_ASSERT (SCM_NIMP (key) && SCM_SYMBOLP (key), key, SCM_ARG1, s_error_scm);
  SCM_ASSERT (SCM_FALSEP (subr) || (SCM_NIMP (subr) && SCM_ROSTRINGP (subr)),
	      subr, SCM_ARG2, s_error_scm);
  SCM_ASSERT (SCM_FALSEP (message)
	      || (SCM_NIMP (message) && SCM_ROSTRINGP (message)),
	      message, SCM_ARG3, s_error_scm);

  scm_error (key,
	     (SCM_FALSEP (subr)) ? NULL : SCM_ROCHARS (subr),
	     (SCM_FALSEP (message)) ? NULL : SCM_ROCHARS (message),
	     args,
	     rest);
  /* not reached.  */
}

SCM_SYMBOL (scm_system_error_key, "system-error");
void
scm_syserror (subr)
     char *subr;
{
  scm_error (scm_system_error_key,
	     subr,
	     "%s",
	     scm_listify (scm_makfrom0str (strerror (errno)),
			  SCM_UNDEFINED),
	     scm_listify (SCM_MAKINUM (errno), SCM_UNDEFINED));
}

void
scm_syserror_msg (subr, message, args, eno)
     char *subr;
     char *message;
     SCM args;
     int eno;
{
  scm_error (scm_system_error_key,
	     subr,
	     message,
	     args,
	     scm_listify (SCM_MAKINUM (eno), SCM_UNDEFINED));
}

void
scm_sysmissing (subr)
     char *subr;
{
#ifdef ENOSYS
  scm_error (scm_system_error_key,
	     subr,
	     "%s",
	     scm_listify (scm_makfrom0str (strerror (ENOSYS)), SCM_UNDEFINED),
	     scm_listify (SCM_MAKINUM (ENOSYS), SCM_UNDEFINED));
#else
  scm_error (scm_system_error_key,
	     subr,
	     "Missing function",
	     SCM_BOOL_F,
	     scm_listify (SCM_MAKINUM (0), SCM_UNDEFINED));
#endif
}

SCM_SYMBOL (scm_num_overflow_key, "numerical-overflow");
void
scm_num_overflow (subr)
  char *subr;
{
  scm_error (scm_num_overflow_key,
	     subr,
	     "Numerical overflow",
	     SCM_BOOL_F,
	     SCM_BOOL_F);
}

SCM_SYMBOL (scm_out_of_range_key, "out-of-range");
void
scm_out_of_range (subr, bad_value)
     char *subr;
     SCM bad_value;
{
  scm_error (scm_out_of_range_key,
	     subr,
	     "Argument out of range: %S",
	     scm_listify (bad_value, SCM_UNDEFINED),
	     SCM_BOOL_F);
}

SCM_SYMBOL (scm_args_number_key, "wrong-number-of-args");
void
scm_wrong_num_args (proc)
     SCM proc;
{
  scm_error (scm_args_number_key,
	     NULL,
	     "Wrong number of arguments to %s",
	     scm_listify (proc, SCM_UNDEFINED),
	     SCM_BOOL_F);
}

SCM_SYMBOL (scm_arg_type_key, "wrong-type-arg");
void
scm_wrong_type_arg (subr, pos, bad_value)
     char *subr;
     int pos;
     SCM bad_value;
{
  scm_error (scm_arg_type_key,
	     subr,
	     (pos == 0) ? "Wrong type argument: %S"
	     : "Wrong type argument in position %s: %S",
	     (pos == 0) ? scm_listify (bad_value, SCM_UNDEFINED)
	     : scm_listify (SCM_MAKINUM (pos), bad_value, SCM_UNDEFINED),
	     SCM_BOOL_F);
}

SCM_SYMBOL (scm_memory_alloc_key, "memory-allocation-error");
void
scm_memory_error (subr)
     char *subr;
{
  scm_error (scm_memory_alloc_key,
	     subr,
	     "Memory allocation error",
	     SCM_BOOL_F,
	     SCM_BOOL_F);
}

SCM_SYMBOL (scm_misc_error_key, "misc-error");
void
scm_misc_error (subr, message, args)
     char *subr;
     char *message;
     SCM args;
{
  scm_error (scm_misc_error_key, subr, message, args, SCM_BOOL_F);
}

/* implements the SCM_ASSERT interface.  */  
SCM
scm_wta (arg, pos, s_subr)
     SCM arg;
     char *pos;
     char *s_subr;
{
  if (!s_subr || !*s_subr)
    s_subr = NULL;
  if ((~0x1fL) & (long) pos)
    {
      /* error string supplied.  */
      scm_misc_error (s_subr, pos, SCM_BOOL_F);
    }
  else
    {
      /* numerical error code.  */
      int error = (long) pos;

      switch (error)
	{
	case SCM_ARGn:
	  scm_wrong_type_arg (s_subr, 0, arg);
	case SCM_ARG1:
	  scm_wrong_type_arg (s_subr, 1, arg);
	case SCM_ARG2:
	  scm_wrong_type_arg (s_subr, 2, arg);
	case SCM_ARG3:
	  scm_wrong_type_arg (s_subr, 3, arg);
	case SCM_ARG4:
	  scm_wrong_type_arg (s_subr, 4, arg);
	case SCM_ARG5:
	  scm_wrong_type_arg (s_subr, 5, arg);
	case SCM_WNA:
	  scm_wrong_num_args (arg);
	case SCM_OUTOFRANGE:
	  scm_out_of_range (s_subr, arg);
	case SCM_NALLOC:
	  scm_memory_error (s_subr);
	default:
	  /* this shouldn't happen.  */
	  scm_misc_error (s_subr, "Unknown error", SCM_BOOL_F);
	}
    }
  return SCM_UNSPECIFIED;
}

/*  obsolete interface: scm_everr (exp, env, arg, pos, s_subr)
    was equivalent to scm_wta (arg, pos, s_subr)  */

void
scm_init_error ()
{
#include "cpp_err_symbols.c"
#include "error.x"
}