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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/* $Id: error.c,v 1.4 2002/02/01 16:49:12 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 <SWI-Prolog.h>
#include <errno.h>
#include <stdlib.h>
#include "error.h"
#include <assert.h>
#include <string.h>
#include <stdio.h>
int
pl_error(plerrorid 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;
char msgbuf[1024];
char *msg = NULL;
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,
PL_FUNCTOR_CHARS, "resource_error", 1,
PL_CHARS, "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,
PL_FUNCTOR_CHARS, "permission_error", 3,
PL_CHARS, action,
PL_CHARS, "file",
PL_CHARS, file);
break;
}
case ENOENT:
{ const char *file = va_arg(args, const char *);
PL_unify_term(formal,
PL_FUNCTOR_CHARS, "existence_error", 2,
PL_CHARS, "file",
PL_CHARS, file);
break;
}
default:
PL_unify_atom_chars(formal, "system_error");
break;
}
break;
}
case ERR_TYPE:
{ const char *expected = va_arg(args, const char*);
term_t actual = va_arg(args, term_t);
if ( PL_is_variable(actual) &&
strcmp(expected, "variable") != 0 )
PL_unify_atom_chars(formal, "instantiation_error");
else
PL_unify_term(formal,
PL_FUNCTOR_CHARS, "type_error", 2,
PL_CHARS, expected,
PL_TERM, actual);
break;
}
case ERR_DOMAIN:
{ const char *expected = va_arg(args, const char*);
term_t actual = va_arg(args, term_t);
if ( PL_is_variable(actual) )
PL_unify_atom_chars(formal, "instantiation_error");
else
PL_unify_term(formal,
PL_FUNCTOR_CHARS, "domain_error", 2,
PL_CHARS, 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,
PL_FUNCTOR_CHARS, "existence_error", 2,
PL_CHARS, type,
PL_TERM, obj);
break;
}
case ERR_FAIL:
{ term_t goal = va_arg(args, term_t);
PL_unify_term(formal,
PL_FUNCTOR_CHARS, "goal_failed", 1,
PL_TERM, goal);
break;
}
case ERR_LIMIT:
{ const char *limit = va_arg(args, const char *);
long maxval = va_arg(args, long);
PL_unify_term(formal,
PL_FUNCTOR_CHARS, "limit_exceeded", 2,
PL_CHARS, limit,
PL_LONG, maxval);
break;
}
case ERR_PACKAGE_INT:
{ const char *pkg = va_arg(args, const char *);
int id = va_arg(args, int);
const char *fmt = va_arg(args, const char *);
vsprintf(msgbuf, fmt, args);
msg = msgbuf;
PL_unify_term(formal,
PL_FUNCTOR_CHARS, "package", 2,
PL_CHARS, pkg,
PL_INT, id);
break;
}
default:
assert(0);
}
va_end(args);
if ( msg )
{ term_t predterm = PL_new_term_ref();
term_t msgterm = PL_new_term_ref();
if ( msg )
{ PL_put_atom_chars(msgterm, msg);
}
PL_unify_term(swi,
PL_FUNCTOR_CHARS, "context", 2,
PL_TERM, predterm,
PL_TERM, msgterm);
}
PL_unify_term(except,
PL_FUNCTOR_CHARS, "error", 2,
PL_TERM, formal,
PL_TERM, swi);
return PL_raise_exception(except);
}
|
