1/* strerror-sym.c - Describing an error code with its symbol name.
2   Copyright (C) 2003, 2004 g10 Code GmbH
3
4   This file is part of libgpg-error.
5
6   libgpg-error is free software; you can redistribute it and/or
7   modify it under the terms of the GNU Lesser General Public License
8   as published by the Free Software Foundation; either version 2.1 of
9   the License, or (at your option) any later version.
10
11   libgpg-error 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.  See the GNU
14   Lesser General Public License for more details.
15
16   You should have received a copy of the GNU Lesser General Public
17   License along with libgpg-error; if not, write to the Free
18   Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
19   02111-1307, USA.  */
20
21#if HAVE_CONFIG_H
22#include <config.h>
23#endif
24
25#include <stddef.h>
26
27#include <gpg-error.h>
28
29#include "err-codes-sym.h"
30#include "errnos-sym.h"
31
32/* Return a pointer to a string containing the name of the symbol of
33   the error code in the error value ERR.  Returns NULL if the error
34   code is not known.  */
35const char *
36gpg_strerror_sym (gpg_error_t err)
37{
38  gpg_err_code_t code = gpg_err_code (err);
39
40  if (code & GPG_ERR_SYSTEM_ERROR)
41    {
42      int idx;
43
44      code &= ~GPG_ERR_SYSTEM_ERROR;
45      idx = errnos_msgidxof (code);
46      if (idx >= 0)
47	return errnos_msgstr + errnos_msgidx[idx];
48      else
49	return NULL;
50    }
51
52  if (msgidxof (code) == msgidxof (GPG_ERR_CODE_DIM))
53    return NULL;
54
55  return msgstr + msgidx[msgidxof (code)];
56}
57