/* vi: set sw=4 ts=4:
 *
 * Copyright (C) 2002 by Erik Andersen <andersen@uclibc.org>
 * Based in part on the files
 *		./sysdeps/unix/sysv/linux/pwrite.c,
 *		./sysdeps/unix/sysv/linux/pread.c,
 *		sysdeps/posix/pread.c
 *		sysdeps/posix/pwrite.c
 * from GNU libc 2.2.5, but reworked considerably...
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#define _LARGEFILE64_SOURCE
#include <features.h>
#undef __OPTIMIZE__
/* We absolutely do _NOT_ want interfaces silently
 *  *  * renamed under us or very bad things will happen... */
#ifdef __USE_FILE_OFFSET64
# undef __USE_FILE_OFFSET64
#endif


#include <errno.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <stdint.h>

extern __typeof(pread) __libc_pread;
extern __typeof(pwrite) __libc_pwrite;
#ifdef __UCLIBC_HAS_LFS__
extern __typeof(pread64) __libc_pread64;
extern __typeof(pwrite64) __libc_pwrite64;
#endif

#ifdef __NR_pread64             /* Newer kernels renamed but it's the same.  */
# ifdef __NR_pread
#  error "__NR_pread and __NR_pread64 both defined???"
# endif
# define __NR_pread __NR_pread64
#endif

#define __NR___syscall_pread __NR_pread
static inline _syscall5(ssize_t, __syscall_pread, int, fd, void *, buf,
		size_t, count, off_t, offset_hi, off_t, offset_lo);

ssize_t __libc_pread(int fd, void *buf, size_t count, off_t offset)
{
	return(__syscall_pread(fd,buf,count,offset,offset >> 31));
}
weak_alias (__libc_pread, pread)

#if defined __UCLIBC_HAS_LFS__
ssize_t __libc_pread64(int fd, void *buf, size_t count, off64_t offset)
{
    uint32_t low = offset & 0xffffffff;
    uint32_t high = offset >> 32;
	return(__syscall_pread(fd, buf, count, low, high));
}
weak_alias (__libc_pread64, pread64)
#endif /* __UCLIBC_HAS_LFS__  */


#ifdef __NR_pwrite64            /* Newer kernels renamed but it's the same.  */
# ifdef __NR_pwrite
#  error "__NR_pwrite and __NR_pwrite64 both defined???"
# endif
# define __NR_pwrite __NR_pwrite64
#endif

#define __NR___syscall_pwrite __NR_pwrite
static inline _syscall5(ssize_t, __syscall_pwrite, int, fd, const void *, buf,
		size_t, count, off_t, offset_hi, off_t, offset_lo);

ssize_t __libc_pwrite(int fd, const void *buf, size_t count, off_t offset)
{
	return(__syscall_pwrite(fd,buf,count,offset,offset >> 31));
}
weak_alias (__libc_pwrite, pwrite)

#if defined __UCLIBC_HAS_LFS__
ssize_t __libc_pwrite64(int fd, const void *buf, size_t count, off64_t offset)
{
    uint32_t low = offset & 0xffffffff;
    uint32_t high = offset >> 32;
	return(__syscall_pwrite(fd, buf, count, low, high));
}
weak_alias (__libc_pwrite64, pwrite64)
#endif /* __UCLIBC_HAS_LFS__  */