kolibrios-fun/contrib/sdk/sources/newlib/libc/sys/lseek.c
Sergey Semyonov (Serge) 7315bb05c0 newlib-2.1.0
git-svn-id: svn://kolibrios.org@4921 a494cfbc-eb01-0410-851d-a64ba20cac60
2014-05-10 22:12:19 +00:00

52 lines
885 B
C

#include <errno.h>
#include <stdlib.h>
#include <sys/unistd.h>
#include <sys/kos_io.h>
#include "glue.h"
#include "io.h"
_off_t
_DEFUN (lseek, (fd, pos, whence),
int fd _AND
_off_t pos _AND
int whence)
{
fileinfo_t info;
__io_handle *ioh;
_off_t ret;
if( (fd < 0) || (fd >=64) )
{
errno = EBADF;
return (-1);
};
ioh = &__io_tab[fd];
switch(whence)
{
case SEEK_SET:
ret = pos;
break;
case SEEK_CUR:
ret = ioh->offset + pos;
break;
case SEEK_END:
{
get_fileinfo(ioh->name, &info);
ret = pos + info.size;
break;
}
default:
errno = EINVAL;
return (-1);
};
ioh->offset = ret;
return( ret );
};