ack/plat/msdos86/libsys/sys_seteof.c

43 lines
774 B
C

/* $Source$
* $State$
* $Revision$
*/
#include <fcntl.h>
#include "libsys.h"
/*
* Set or reset the "end-of-file encountered" indicator for a particular fd.
* Assume that the fd is valid, and is being read from in text mode.
*/
int _sys_seteof(int fd, int eof)
{
int reqbegfd = fd & ~_FDVECMASK;
struct _fdmodes *p = &_sys_fdmodes;
_fdvec_t mask;
while (p->begfd != reqbegfd)
{
p = p->next;
if (!p)
{
if (!eof)
return 0;
if ((p = sbrk(sizeof(struct _fdmodes)))
== OUT_OF_MEMORY)
return -1;
p->next = _sys_fdmodes.next;
p->begfd = reqbegfd;
p->modevec = p->eofvec = 0;
_sys_fdmodes.next = p;
break;
}
}
mask = (_fdvec_t)1 << (fd & _FDVECMASK);
if (eof)
p->eofvec |= mask;
else
p->eofvec &= ~mask;
return 0;
}