1  /* Print a message describing error code.
       2     Copyright (C) 2008-2021 Free Software Foundation, Inc.
       3     Written by Bruno Haible and Simon Josefsson.
       4  
       5     This file is free software: you can redistribute it and/or modify
       6     it under the terms of the GNU Lesser General Public License as
       7     published by the Free Software Foundation; either version 2.1 of the
       8     License, or (at your option) any later version.
       9  
      10     This file 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 Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public License
      16     along with this program.  If not, see <https://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  }