1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
/* $Id: error.c,v 1.3 2002/02/01 15:47:00 jan Exp $
Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: jan@swi.psy.uva.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2002, 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, ...)
{ term_t except = PL_new_term_ref();
term_t formal = PL_new_term_ref();
term_t swi = PL_new_term_ref();
va_list args;
va_start(args, id);
switch(id)
{ case ERR_ERRNO:
{ int err = va_arg(args, int);
msg = strerror(err);
switch(err)
{ case ENOMEM:
PL_unify_term(formal,
CompoundArg("resource_error", 1),
AtomArg("no_memory"));
break;
case EACCES:
{ const char *file = va_arg(args, const char *);
const char *action = va_arg(args, const char *);
PL_unify_term(formal,
CompoundArg("permission_error", 3),
AtomArg(action),
AtomArg("file"),
AtomArg(file));
break;
}
case ENOENT:
{ const char *file = va_arg(args, const char *);
PL_unify_term(formal,
CompoundArg("existence_error", 2),
AtomArg("file"),
AtomArg(file));
break;
}
default:
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") )
PL_unify_atom_chars(formal, "instantiation_error");
else
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*));
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);
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 *);
PL_unify_term(formal,
CompoundArg("permission_error", 3),
AtomArg(op),
AtomArg(objtype),
PL_TERM, obj);
break;
}
default:
assert(0);
}
va_end(args);
if ( pred || msg )
{ term_t predterm = PL_new_term_ref();
term_t msgterm = PL_new_term_ref();
if ( pred )
{ PL_unify_term(predterm,
CompoundArg("divide", 2),
AtomArg(pred),
IntArg(arity));
}
if ( msg )
{ PL_put_atom_chars(msgterm, msg);
}
PL_unify_term(swi,
CompoundArg("context", 2),
PL_TERM, predterm,
PL_TERM, msgterm);
}
PL_unify_term(except,
CompoundArg("error", 2),
PL_TERM, formal,
PL_TERM, swi);
return PL_raise_exception(except);
}
|
