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/* editenv.c - tool to edit environment block. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2008,2009,2010,2013 Free Software Foundation, Inc.
*
* GRUB 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.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <grub/types.h>
#include <grub/emu/misc.h>
#include <grub/util/misc.h>
#include <grub/util/install.h>
#include <grub/lib/envblk.h>
#include <grub/i18n.h>
#include <grub/emu/hostfile.h>
#include <errno.h>
#include <string.h>
#define DEFAULT_ENVBLK_SIZE 1024
void
grub_util_create_envblk_file (const char *name)
{
FILE *fp;
char *buf;
char *namenew;
buf = xmalloc (DEFAULT_ENVBLK_SIZE);
namenew = xasprintf ("%s.new", name);
fp = grub_util_fopen (namenew, "wb");
if (! fp)
grub_util_error (_("cannot open `%s': %s"), namenew,
strerror (errno));
memcpy (buf, GRUB_ENVBLK_SIGNATURE, sizeof (GRUB_ENVBLK_SIGNATURE) - 1);
memset (buf + sizeof (GRUB_ENVBLK_SIGNATURE) - 1, '#',
DEFAULT_ENVBLK_SIZE - sizeof (GRUB_ENVBLK_SIGNATURE) + 1);
if (fwrite (buf, 1, DEFAULT_ENVBLK_SIZE, fp) != DEFAULT_ENVBLK_SIZE)
grub_util_error (_("cannot write to `%s': %s"), namenew,
strerror (errno));
grub_util_file_sync (fp);
free (buf);
fclose (fp);
if (grub_util_rename (namenew, name) < 0)
grub_util_error (_("cannot rename the file %s to %s"), namenew, name);
free (namenew);
}
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