/* Error table. Copyright (C) 2019-2024 Free Software Foundation, Inc. This file is part of libctf. libctf is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; see the file COPYING. If not see <http://www.gnu.org/licenses/>. */ #include <ctf-impl.h> #include <stddef.h> #include <string.h> /* This construct is due to Bruno Haible: much thanks. */ /* Give each structure member a unique name. The name does not matter, so we use the enum constant to uniquify them. */ #define ERRSTRFIELD(N) ctf_errstr##N /* In this file, we want to treat the first item of the ctf error macro like subsequent items. */ #define _CTF_FIRST(NAME, VALUE) _CTF_ITEM(NAME, VALUE) /* The error message strings, each in a unique structure member precisely big enough for that error, plus a str member to access them all as a string table. */ static const union _ctf_errlist_t { __extension__ struct { #define _CTF_ITEM(n, s) char ERRSTRFIELD (n) [sizeof (s)]; _CTF_ERRORS #undef _CTF_ITEM }; char str[1]; } _ctf_errlist = { { #define _CTF_ITEM(n, s) N_(s), _CTF_ERRORS #undef _CTF_ITEM } }; /* Offsets to each member in the string table, computed using offsetof. */ static const unsigned int _ctf_erridx[] = { #define _CTF_ITEM(n, s) [n - ECTF_BASE] = offsetof (union _ctf_errlist_t, ERRSTRFIELD (n)), _CTF_ERRORS #undef _CTF_ITEM }; const char * ctf_errmsg (int error) { const char *str; if (error >= ECTF_BASE && (error - ECTF_BASE) < ECTF_NERR) str = _ctf_errlist.str + _ctf_erridx[error - ECTF_BASE]; else str = (const char *) strerror (error); return (str ? gettext (str) : _("Unknown error")); } int ctf_errno (ctf_dict_t * fp) { return fp->ctf_errno; }