clib package
This commit is contained in:
Vítor Santos Costa
209
packages/clib/error.c
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209
packages/clib/error.c
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/* $Id$
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Part of SWI-Prolog
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Author: Jan Wielemaker
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E-mail: J.Wielemaker@uva.nl
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WWW: http://www.swi-prolog.org
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Copyright (C): 1985-2008, University of Amsterdam
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include "clib.h"
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#include <assert.h>
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#include <string.h>
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int
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pl_error(const char *pred, int arity, const char *msg, int id, ...)
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{ fid_t fid;
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term_t except, formal, swi;
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int rc;
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va_list args;
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if ( !(fid=PL_open_foreign_frame()) )
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return FALSE;
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except = PL_new_term_ref();
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formal = PL_new_term_ref();
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swi = PL_new_term_ref();
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va_start(args, id);
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switch(id)
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{ case ERR_ERRNO:
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{ int err = va_arg(args, int);
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const char *action = va_arg(args, const char *);
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const char *type = va_arg(args, const char *);
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term_t object = va_arg(args, term_t);
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if ( !object )
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object = PL_new_term_ref();
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msg = strerror(err);
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switch(err)
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{ case ENOMEM:
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rc = PL_unify_term(formal,
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CompoundArg("resource_error", 1),
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AtomArg("no_memory"));
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break;
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case EACCES:
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case EPERM:
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{ rc = PL_unify_term(formal,
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CompoundArg("permission_error", 3),
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AtomArg(action),
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AtomArg(type),
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PL_TERM, object);
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break;
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}
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case ENOENT:
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case ESRCH:
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{ rc = PL_unify_term(formal,
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CompoundArg("existence_error", 2),
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AtomArg(type),
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PL_TERM, object);
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break;
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}
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default:
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rc = PL_unify_atom_chars(formal, "system_error");
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break;
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}
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break;
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}
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case ERR_ARGTYPE:
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{ int argn = va_arg(args, int);
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term_t actual = va_arg(args, term_t);
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atom_t expected = PL_new_atom(va_arg(args, const char*));
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if ( PL_is_variable(actual) && expected != PL_new_atom("variable") )
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rc = PL_unify_atom_chars(formal, "instantiation_error");
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else
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rc = PL_unify_term(formal,
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CompoundArg("type_error", 2),
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PL_ATOM, expected,
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PL_TERM, actual);
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break;
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}
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case ERR_TYPE:
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{ term_t actual = va_arg(args, term_t);
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atom_t expected = PL_new_atom(va_arg(args, const char*));
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if ( PL_is_variable(actual) && expected != PL_new_atom("variable") )
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rc = PL_unify_atom_chars(formal, "instantiation_error");
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else
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rc = PL_unify_term(formal,
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CompoundArg("type_error", 2),
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PL_ATOM, expected,
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PL_TERM, actual);
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break;
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}
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case ERR_DOMAIN:
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{ term_t actual = va_arg(args, term_t);
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atom_t expected = PL_new_atom(va_arg(args, const char*));
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rc = PL_unify_term(formal,
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CompoundArg("domain_error", 2),
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PL_ATOM, expected,
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PL_TERM, actual);
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break;
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}
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case ERR_EXISTENCE:
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{ const char *type = va_arg(args, const char *);
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term_t obj = va_arg(args, term_t);
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rc = PL_unify_term(formal,
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CompoundArg("existence_error", 2),
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PL_CHARS, type,
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PL_TERM, obj);
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break;
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}
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case ERR_PERMISSION:
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{ term_t obj = va_arg(args, term_t);
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const char *op = va_arg(args, const char *);
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const char *objtype = va_arg(args, const char *);
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rc = PL_unify_term(formal,
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CompoundArg("permission_error", 3),
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AtomArg(op),
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AtomArg(objtype),
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PL_TERM, obj);
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break;
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}
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case ERR_NOTIMPLEMENTED:
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{ const char *op = va_arg(args, const char *);
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term_t obj = va_arg(args, term_t);
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rc = PL_unify_term(formal,
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CompoundArg("not_implemented", 2),
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AtomArg(op),
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PL_TERM, obj);
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}
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case ERR_RESOURCE:
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{ const char *res = va_arg(args, const char *);
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rc = PL_unify_term(formal,
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CompoundArg("resource_error", 1),
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AtomArg(res));
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}
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case ERR_SYNTAX:
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{ const char *culprit = va_arg(args, const char *);
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rc = PL_unify_term(formal,
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CompoundArg("syntax_error", 1),
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AtomArg(culprit));
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}
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default:
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assert(0);
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}
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va_end(args);
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if ( rc && (pred || msg) )
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{ term_t predterm = PL_new_term_ref();
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term_t msgterm = PL_new_term_ref();
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if ( pred )
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{ rc = PL_unify_term(predterm,
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CompoundArg("/", 2),
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AtomArg(pred),
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IntArg(arity));
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}
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if ( msg )
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{ rc = PL_put_atom_chars(msgterm, msg);
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}
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if ( rc )
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rc = PL_unify_term(swi,
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CompoundArg("context", 2),
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PL_TERM, predterm,
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PL_TERM, msgterm);
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}
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if ( rc )
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rc = PL_unify_term(except,
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CompoundArg("error", 2),
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PL_TERM, formal,
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PL_TERM, swi);
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PL_close_foreign_frame(fid);
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if ( rc )
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return PL_raise_exception(except);
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return rc;
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}
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