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/* Get a host configuration item kept as the whole contents of a file.
Copyright (C) 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <hurd.h>
#include "hurdhost.h"
ssize_t
_hurd_get_host_config (const char *item, char *buf, size_t buflen)
{
error_t err;
char *data;
mach_msg_type_number_t nread, more;
file_t config = __file_name_lookup (item, O_RDONLY, 0);
if (config == MACH_PORT_NULL)
return -1;
data = buf;
err = __io_read (config, &data, &nread, -1, buflen);
if (! err)
/* Check if there is more in the file we didn't read. */
err = __io_readable (config, &more);
__mach_port_deallocate (__mach_task_self (), config);
if (err)
return __hurd_fail (err);
if (data != buf)
{
memcpy (buf, data, nread);
__vm_deallocate (__mach_task_self (), (vm_address_t) data, nread);
}
/* Remove newlines in case someone wrote the file by hand. */
while (buf[nread - 1] == '\n')
buf[--nread] = '\0';
if (more)
/* If we didn't read the whole file, tell the caller to use a bigger
buffer next time. */
return __hurd_fail (ENAMETOOLONG);
return nread;
}
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