ctf-error.c revision 1.1.1.2
1/* Error table. 2 Copyright (C) 2019-2022 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