1/* Error table.
2   Copyright (C) 2019-2020 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 line number in ctf-error.h to uniquify them.  */
28
29#define ERRSTRFIELD(line) ERRSTRFIELD1 (line)
30#define ERRSTRFIELD1(line) ctf_errstr##line
31
32/* The error message strings, each in a unique structure member precisely big
33   enough for that error, plus a str member to access them all as a string
34   table.  */
35
36static const union _ctf_errlist_t
37{
38  __extension__ struct
39  {
40#define _CTF_STR(n, s) char ERRSTRFIELD (__LINE__) [sizeof (s)];
41#include "ctf-error.h"
42#undef _CTF_STR
43  };
44  char str[1];
45} _ctf_errlist =
46  {
47   {
48#define _CTF_STR(n, s) N_(s),
49#include "ctf-error.h"
50#undef _CTF_STR
51   }
52  };
53
54/* Offsets to each member in the string table, computed using offsetof.  */
55
56static const unsigned int _ctf_erridx[] =
57  {
58#define _CTF_STR(n, s) [n - ECTF_BASE] = offsetof (union _ctf_errlist_t, ERRSTRFIELD (__LINE__)),
59#include "ctf-error.h"
60#undef _CTF_STR
61  };
62
63const char *
64ctf_errmsg (int error)
65{
66  const char *str;
67
68  if (error >= ECTF_BASE && (error - ECTF_BASE) < ECTF_NERR)
69    str = _ctf_errlist.str + _ctf_erridx[error - ECTF_BASE];
70  else
71    str = (const char *) strerror (error);
72
73  return (str ? gettext (str) : _("Unknown error"));
74}
75
76int
77ctf_errno (ctf_file_t * fp)
78{
79  return fp->ctf_errno;
80}
81