62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
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/* Internal errno names mapping definition.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <errno.h>
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#include <libintl.h>
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#include <array_length.h>
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#ifndef ERR_MAP
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# define ERR_MAP(n) n
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#endif
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static const union sys_errname_t
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{
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struct
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{
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#define MSGSTRFIELD1(line) str##line
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#define MSGSTRFIELD(line) MSGSTRFIELD1(line)
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#define _S(n, str) char MSGSTRFIELD(__LINE__)[sizeof(#n)];
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#include <errlist.h>
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#undef _S
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};
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char str[0];
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} _sys_errname = { {
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#define _S(n, s) #n,
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#include <errlist.h>
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#undef _S
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} };
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static const unsigned short _sys_errnameidx[] =
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{
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#define _S(n, s) \
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[ERR_MAP(n)] = offsetof(union sys_errname_t, MSGSTRFIELD(__LINE__)),
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#include <errlist.h>
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#undef _S
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};
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const char *
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__get_errname (int errnum)
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{
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int mapped = ERR_MAP (errnum);
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if (mapped < 0 || mapped >= array_length (_sys_errnameidx)
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|| (mapped > 0 && _sys_errnameidx[mapped] == 0))
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return NULL;
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return _sys_errname.str + _sys_errnameidx[mapped];
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}
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