1/* Error table.
2   Copyright (C) 2019-2024 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
39static 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
59static 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
66const char *
67ctf_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
79int
80ctf_errno (ctf_dict_t * fp)
81{
82  return fp->ctf_errno;
83}
84