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 36 static 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 56 static 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 63 const char * 64 ctf_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 76 int 77 ctf_errno (ctf_file_t * fp) 78 { 79 return fp->ctf_errno; 80 } 81