/*******************************************************************************

    Copyright(C) Jonas 'Sortie' Termansen 2012.

    This file is part of Sortix.

    Sortix 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.

    Sortix 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
    Sortix. If not, see <http://www.gnu.org/licenses/>.

    kernelinfo.cpp
    Lets user-space query information about the kernel.

*******************************************************************************/

#include <brand.h>
#include <errno.h>

#include <sortix/kernel/copy.h>
#include <sortix/kernel/kernel.h>
#include <sortix/kernel/syscall.h>

#ifndef VERSIONSTR
#define VERSIONSTR "unknown"
#endif

namespace Sortix {

static const char* KernelInfo(const char* req)
{
	if ( strcmp(req, "name") == 0 ) { return BRAND_KERNEL_NAME; }
	if ( strcmp(req, "version") == 0 ) { return VERSIONSTR; }
	if ( strcmp(req, "builddate") == 0 ) { return __DATE__; }
	if ( strcmp(req, "buildtime") == 0 ) { return __TIME__; }
	return NULL;
}

ssize_t sys_kernelinfo(const char* req, char* resp, size_t resplen)
{
	const char* str = KernelInfo(req);
	if ( !str )
		return errno = EINVAL, -1;
	size_t stringlen = strlen(str);
	if ( resplen < stringlen + 1 )
		return errno = ERANGE, (ssize_t) stringlen;
	if ( !CopyToUser(resp, str, sizeof(char) * (stringlen + 1)) )
		return -1;
	return 0;
}

} // namespace Sortix