1 /* Error table.
2 Copyright (C) 2019-2022 Free Software Foundation, Inc.
3
4 This file is part of libctf.
5
6 libctf is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
9 version.
10
11 This program is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
14 See the GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; see the file COPYING. If not see
18 <http://www.gnu.org/licenses/>. */
19
20 #include <ctf-impl.h>
21 #include <stddef.h>
22 #include <string.h>
23
24 /* This construct is due to Bruno Haible: much thanks. */
25
26 /* Give each structure member a unique name. The name does not matter, so we
27 use the enum constant to uniquify them. */
28
29 #define ERRSTRFIELD(N) ctf_errstr##N
30
31 /* In this file, we want to treat the first item of the ctf error
32 macro like subsequent items. */
33 #define _CTF_FIRST(NAME, VALUE) _CTF_ITEM(NAME, VALUE)
34
35 /* The error message strings, each in a unique structure member precisely big
36 enough for that error, plus a str member to access them all as a string
37 table. */
38
39 static const union _ctf_errlist_t
40 {
41 __extension__ struct
42 {
43 #define _CTF_ITEM(n, s) char ERRSTRFIELD (n) [sizeof (s)];
44 _CTF_ERRORS
45 #undef _CTF_ITEM
46 };
47 char str[1];
48 } _ctf_errlist =
49 {
50 {
51 #define _CTF_ITEM(n, s) N_(s),
52 _CTF_ERRORS
53 #undef _CTF_ITEM
54 }
55 };
56
57 /* Offsets to each member in the string table, computed using offsetof. */
58
59 static const unsigned int _ctf_erridx[] =
60 {
61 #define _CTF_ITEM(n, s) [n - ECTF_BASE] = offsetof (union _ctf_errlist_t, ERRSTRFIELD (n)),
62 _CTF_ERRORS
63 #undef _CTF_ITEM
64 };
65
66 const char *
ctf_errmsg(int error)67 ctf_errmsg (int error)
68 {
69 const char *str;
70
71 if (error >= ECTF_BASE && (error - ECTF_BASE) < ECTF_NERR)
72 str = _ctf_errlist.str + _ctf_erridx[error - ECTF_BASE];
73 else
74 str = (const char *) strerror (error);
75
76 return (str ? gettext (str) : _("Unknown error"));
77 }
78
79 int
ctf_errno(ctf_dict_t * fp)80 ctf_errno (ctf_dict_t * fp)
81 {
82 return fp->ctf_errno;
83 }
84