1 /* Print a message describing error code. 2 Copyright (C) 2008-2012 Free Software Foundation, Inc. 3 Written by Bruno Haible and Simon Josefsson. 4 5 This program is free software: you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 18 #include <config.h> 19 20 /* Specification. */ 21 #include <stdio.h> 22 23 #include <errno.h> 24 #include <stdlib.h> 25 #include <string.h> 26 27 #include "strerror-override.h" 28 29 /* Use the system functions, not the gnulib overrides in this file. */ 30 #undef fprintf 31 32 void 33 perror (const char *string) 34 { 35 char stackbuf[STACKBUF_LEN]; 36 int ret; 37 38 /* Our implementation guarantees that this will be a non-empty 39 string, even if it returns EINVAL; and stackbuf should be sized 40 large enough to avoid ERANGE. */ 41 ret = strerror_r (errno, stackbuf, sizeof stackbuf); 42 if (ret == ERANGE) 43 abort (); 44 45 if (string != NULL && *string != '\0') 46 fprintf (stderr, "%s: %s\n", string, stackbuf); 47 else 48 fprintf (stderr, "%s\n", stackbuf); 49 } 50
