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yap-6.3/packages/clib/error.c

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2010-06-17 00:40:25 +01:00
/* $Id$
Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@uva.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2008, University of Amsterdam
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
*/
#include <errno.h>
#include <stdlib.h>
#include "clib.h"
#include <assert.h>
#include <string.h>
int
pl_error(const char *pred, int arity, const char *msg, int id, ...)
{ fid_t fid;
term_t except, formal, swi;
int rc;
va_list args;
if ( !(fid=PL_open_foreign_frame()) )
return FALSE;
except = PL_new_term_ref();
formal = PL_new_term_ref();
swi = PL_new_term_ref();
va_start(args, id);
switch(id)
{ case ERR_ERRNO:
{ int err = va_arg(args, int);
const char *action = va_arg(args, const char *);
const char *type = va_arg(args, const char *);
term_t object = va_arg(args, term_t);
if ( !object )
object = PL_new_term_ref();
msg = strerror(err);
switch(err)
{ case ENOMEM:
rc = PL_unify_term(formal,
CompoundArg("resource_error", 1),
AtomArg("no_memory"));
break;
case EACCES:
case EPERM:
{ rc = PL_unify_term(formal,
CompoundArg("permission_error", 3),
AtomArg(action),
AtomArg(type),
PL_TERM, object);
break;
}
case ENOENT:
case ESRCH:
{ rc = PL_unify_term(formal,
CompoundArg("existence_error", 2),
AtomArg(type),
PL_TERM, object);
break;
}
default:
rc = PL_unify_atom_chars(formal, "system_error");
break;
}
break;
}
case ERR_ARGTYPE:
{ int argn = va_arg(args, int);
term_t actual = va_arg(args, term_t);
atom_t expected = PL_new_atom(va_arg(args, const char*));
if ( PL_is_variable(actual) && expected != PL_new_atom("variable") )
rc = PL_unify_atom_chars(formal, "instantiation_error");
else
rc = PL_unify_term(formal,
CompoundArg("type_error", 2),
PL_ATOM, expected,
PL_TERM, actual);
break;
}
case ERR_TYPE:
{ term_t actual = va_arg(args, term_t);
atom_t expected = PL_new_atom(va_arg(args, const char*));
if ( PL_is_variable(actual) && expected != PL_new_atom("variable") )
rc = PL_unify_atom_chars(formal, "instantiation_error");
else
rc = PL_unify_term(formal,
CompoundArg("type_error", 2),
PL_ATOM, expected,
PL_TERM, actual);
break;
}
case ERR_DOMAIN:
{ term_t actual = va_arg(args, term_t);
atom_t expected = PL_new_atom(va_arg(args, const char*));
rc = PL_unify_term(formal,
CompoundArg("domain_error", 2),
PL_ATOM, expected,
PL_TERM, actual);
break;
}
case ERR_EXISTENCE:
{ const char *type = va_arg(args, const char *);
term_t obj = va_arg(args, term_t);
rc = PL_unify_term(formal,
CompoundArg("existence_error", 2),
PL_CHARS, type,
PL_TERM, obj);
break;
}
case ERR_PERMISSION:
{ term_t obj = va_arg(args, term_t);
const char *op = va_arg(args, const char *);
const char *objtype = va_arg(args, const char *);
rc = PL_unify_term(formal,
CompoundArg("permission_error", 3),
AtomArg(op),
AtomArg(objtype),
PL_TERM, obj);
break;
}
case ERR_NOTIMPLEMENTED:
{ const char *op = va_arg(args, const char *);
term_t obj = va_arg(args, term_t);
rc = PL_unify_term(formal,
CompoundArg("not_implemented", 2),
AtomArg(op),
PL_TERM, obj);
}
case ERR_RESOURCE:
{ const char *res = va_arg(args, const char *);
rc = PL_unify_term(formal,
CompoundArg("resource_error", 1),
AtomArg(res));
}
case ERR_SYNTAX:
{ const char *culprit = va_arg(args, const char *);
rc = PL_unify_term(formal,
CompoundArg("syntax_error", 1),
AtomArg(culprit));
}
default:
assert(0);
}
va_end(args);
if ( rc && (pred || msg) )
{ term_t predterm = PL_new_term_ref();
term_t msgterm = PL_new_term_ref();
if ( pred )
{ rc = PL_unify_term(predterm,
CompoundArg("/", 2),
AtomArg(pred),
IntArg(arity));
}
if ( msg )
{ rc = PL_put_atom_chars(msgterm, msg);
}
if ( rc )
rc = PL_unify_term(swi,
CompoundArg("context", 2),
PL_TERM, predterm,
PL_TERM, msgterm);
}
if ( rc )
rc = PL_unify_term(except,
CompoundArg("error", 2),
PL_TERM, formal,
PL_TERM, swi);
PL_close_foreign_frame(fid);
if ( rc )
return PL_raise_exception(except);
return rc;
}