/* strerror.c - string corresponding to a particular value of errno. */

/* Copyright (C) 1995,2022 Free Software Foundation, Inc.

   This file is part of GNU Bash, the Bourne Again SHell.

   Bash 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 of the License, or
   (at your option) any later version.

   Bash 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 Bash.  If not, see <http://www.gnu.org/licenses/>.
*/
   
#include <config.h>

#if !defined (HAVE_STRERROR)

#include <bashtypes.h>
#if defined (HAVE_SYS_PARAM_H)
#  include <sys/param.h>
#endif

#if defined (HAVE_UNISTD_H)
#  include <unistd.h>
#endif

#include <stdio.h>
#include <errno.h>

#include <shell.h>

#if !defined (errno)
extern int errno;
#endif /* !errno */

/* Return a string corresponding to the error number E.  From
   the ANSI C spec. */
#if defined (strerror)
#  undef strerror
#endif

static char *errbase = "Unknown system error ";

char *
strerror (int e)
{
  static char emsg[40];
#if defined (HAVE_SYS_ERRLIST)
  extern int sys_nerr;
  extern char *sys_errlist[];

  if (e > 0 && e < sys_nerr)
    return (sys_errlist[e]);
  else
#endif /* HAVE_SYS_ERRLIST */
    {
      char *z;

      z = itos (e);
      strcpy (emsg, errbase);
      strcat (emsg, z);
      free (z);
      return (&emsg[0]);
    }
}
#endif /* HAVE_STRERROR */
