guile/libguile/error.c

/* Copyright (C) 1995,1996,1997,1998,2000,2001 Free Software Foundation, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */




#if HAVE_CONFIG_H
#  include <config.h>
#endif

#include <stdio.h>
#include <errno.h>

#include "libguile/_scm.h"
#include "libguile/pairs.h"
#include "libguile/strings.h"
#include "libguile/throw.h"

#include "libguile/validate.h"
#include "libguile/error.h"

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

/* For Windows... */
#ifdef HAVE_IO_H
#include <io.h>
#endif



/* {Errors and Exceptional Conditions}
 */


/* All errors should pass through here.  */
void
scm_error (SCM key, const char *subr, const char *message, SCM args, SCM rest)
{
  SCM arg_list;
  if (scm_gc_running_p)
    {
      /* The error occured during GC --- abort */
      fprintf (stderr, "Error in %s during GC: %s\n",
	       subr ? subr : "unknown function",
	       message ? message : "<empty message>");
      abort ();
    }
  arg_list = scm_list_4 (subr ? scm_makfrom0str (subr) : SCM_BOOL_F,
			 message ? scm_makfrom0str (message) : SCM_BOOL_F,
			 args,
			 rest);
  scm_ithrow (key, arg_list, 1);
  
  /* No return, but just in case: */
  {
    const char msg[] = "guile:scm_error:scm_ithrow returned!\n";

    write (2, msg, (sizeof msg) - 1);
  }
  exit (1);
}

/* Scheme interface to scm_error.  */
SCM_DEFINE (scm_error_scm, "scm-error", 5, 0, 0, 
           (SCM key, SCM subr, SCM message, SCM args, SCM data),
	    "Raise an error with key @var{key}.  @var{subr} can be a string\n"
	    "naming the procedure associated with the error, or @code{#f}.\n"
	    "@var{message} is the error message string, possibly containing\n"
	    "@code{~S} and @code{~A} escapes.  When an error is reported,\n"
	    "these are replaced by formatting the corresponding members of\n"
	    "@var{args}: @code{~A} (was @code{%s} in older versions of\n"
	    "Guile) formats using @code{display} and @code{~S} (was\n"
	    "@code{%S}) formats using @code{write}.  @var{data} is a list or\n"
	    "@code{#f} depending on @var{key}: if @var{key} is\n"
	    "@code{system-error} then it should be a list containing the\n"
	    "Unix @code{errno} value; If @var{key} is @code{signal} then it\n"
	    "should be a list containing the Unix signal number; otherwise\n"
	    "it will usually be @code{#f}.")
#define FUNC_NAME s_scm_error_scm
{
  char *szSubr;
  char *szMessage;

  SCM_VALIDATE_SYMBOL (1, key);

  if (scm_is_false (subr))
    {
      szSubr = NULL;
    }
  else if (SCM_SYMBOLP (subr))
    {
      szSubr = SCM_SYMBOL_CHARS (subr);
    }
  else
    {
      SCM_VALIDATE_STRING (2, subr);
      szSubr = SCM_STRING_CHARS (subr);
    }

  if (scm_is_false (message))
    {
      szMessage = NULL;
    }
  else
    {
      SCM_VALIDATE_STRING (2, message);
      szMessage = SCM_STRING_CHARS (message);
    }

  scm_error (key, szSubr, szMessage, args, data);
  /* not reached.  */
}
#undef FUNC_NAME

#ifdef __MINGW32__
# include "win32-socket.h"
# define SCM_I_STRERROR(err) \
    ((err >= WSABASEERR) ? scm_i_socket_strerror (err) : strerror (err))
# define SCM_I_ERRNO() \
    (errno ? errno : scm_i_socket_errno ())
#else
# define SCM_I_STRERROR(err) strerror (err)
# define SCM_I_ERRNO() errno
#endif /* __MINGW32__ */

SCM_DEFINE (scm_strerror, "strerror", 1, 0, 0, 
            (SCM err),
	    "Return the Unix error message corresponding to @var{err}, which\n"
	    "must be an integer value.")
#define FUNC_NAME s_scm_strerror
{
  return scm_makfrom0str (SCM_I_STRERROR (scm_to_int (err)));
}
#undef FUNC_NAME

SCM_GLOBAL_SYMBOL (scm_system_error_key, "system-error");
void
scm_syserror (const char *subr)
{
  int save_errno = SCM_I_ERRNO ();
  
  scm_error (scm_system_error_key,
	     subr,
	     "~A",
	     scm_cons (scm_makfrom0str (SCM_I_STRERROR (save_errno)), SCM_EOL),
	     scm_cons (scm_from_int (save_errno), SCM_EOL));
}

void
scm_syserror_msg (const char *subr, const char *message, SCM args, int eno)
{
  scm_error (scm_system_error_key,
	     subr,
	     message,
	     args,
	     scm_cons (scm_from_int (eno), SCM_EOL));
}

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

SCM_GLOBAL_SYMBOL (scm_out_of_range_key, "out-of-range");
void
scm_out_of_range (const char *subr, SCM bad_value)
{
  scm_error (scm_out_of_range_key,
	     subr,
	     "Argument out of range: ~S",
             scm_list_1 (bad_value),
	     SCM_BOOL_F);
}

void
scm_out_of_range_pos (const char *subr, SCM bad_value, SCM pos)
{
  scm_error (scm_out_of_range_key,
	     subr,
	     "Argument ~S out of range: ~S",
             scm_list_2 (pos, bad_value),
	     SCM_BOOL_F);
}


SCM_GLOBAL_SYMBOL (scm_args_number_key, "wrong-number-of-args");
void
scm_wrong_num_args (SCM proc)
{
  scm_error (scm_args_number_key,
	     NULL,
	     "Wrong number of arguments to ~A",
	     scm_list_1 (proc),
	     SCM_BOOL_F);
}


void
scm_error_num_args_subr (const char *subr)
{
  scm_error (scm_args_number_key,
	     NULL,
	     "Wrong number of arguments to ~A",
	     scm_list_1 (scm_makfrom0str (subr)),
	     SCM_BOOL_F);
}


SCM_GLOBAL_SYMBOL (scm_arg_type_key, "wrong-type-arg");
void
scm_wrong_type_arg (const 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 ~A: ~S",
	     (pos == 0) ? scm_list_1 (bad_value)
	     : scm_list_2 (SCM_I_MAKINUM (pos), bad_value),
	     SCM_BOOL_F);
}

void
scm_wrong_type_arg_msg (const char *subr, int pos, SCM bad_value, const char *szMessage)
{
  SCM msg = scm_makfrom0str(szMessage);
  if (pos == 0) {
    scm_error (scm_arg_type_key,
               subr, "Wrong type argument (expecting ~A): ~S",
               scm_list_2 (msg, bad_value),
               SCM_BOOL_F);
  } else {
    scm_error (scm_arg_type_key,
               subr,
               "Wrong type argument in position ~A (expecting ~A): ~S",
               scm_list_3 (SCM_I_MAKINUM (pos), msg, bad_value),
               SCM_BOOL_F);
  }
}


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

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

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


/*
  Local Variables:
  c-file-style: "gnu"
  End:
*/