sl@0: /* REFILL.C
sl@0:  * 
sl@0:  * Portions Copyright (c) 1990-1999 Nokia Corporation and/or its subsidiary(-ies).
sl@0:  * All rights reserved.
sl@0:  */
sl@0: 
sl@0: /* No user fns here.  Pesch 15apr92. */
sl@0: 
sl@0: /*
sl@0:  * Copyright (c) 1990 The Regents of the University of California.
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * Redistribution and use in source and binary forms are permitted
sl@0:  * provided that the above copyright notice and this paragraph are
sl@0:  * duplicated in all such forms and that any documentation,
sl@0:  * advertising materials, and other materials related to such
sl@0:  * distribution and use acknowledge that the software was developed
sl@0:  * by the University of California, Berkeley.  The name of the
sl@0:  * University may not be used to endorse or promote products derived
sl@0:  * from this software without specific prior written permission.
sl@0:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
sl@0:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
sl@0:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
sl@0:  */
sl@0: 
sl@0: #include <stdio_r.h>
sl@0: #include "LOCAL.H"
sl@0: #include <stdlib_r.h>
sl@0: 
sl@0: static int
sl@0: lflush (FILE *fp)
sl@0: {
sl@0:   if ((fp->_flags & (__SLBF | __SWR)) == (__SLBF | __SWR))
sl@0:     return fflush (fp);
sl@0:   return 0;
sl@0: }
sl@0: 
sl@0: /*
sl@0:  * Refill a stdio buffer.
sl@0:  * Return EOF on eof or error, 0 otherwise.
sl@0:  */
sl@0: 
sl@0: int
sl@0: __srefill (register FILE * fp)
sl@0: {
sl@0:   /* make sure stdio is set up */
sl@0: 
sl@0:   CHECK_INIT (fp);
sl@0: 
sl@0:   fp->_r = 0;			/* largely a convenience for callers */
sl@0: 
sl@0:   /* SysV does not make this test; take it out for compatibility */
sl@0:   if (fp->_flags & __SEOF)
sl@0:     return EOF;
sl@0: 
sl@0:   /* if not already reading, have to be reading and writing */
sl@0:   if ((fp->_flags & __SRD) == 0)
sl@0:     {
sl@0:       if ((fp->_flags & __SRW) == 0)
sl@0: 	return EOF;
sl@0:       /* switch to reading */
sl@0:       if (fp->_flags & __SWR)
sl@0: 	{
sl@0: 	  if (fflush (fp))
sl@0: 	    return EOF;
sl@0: 	  fp->_flags &= ~__SWR;
sl@0: 	  fp->_w = 0;
sl@0: 	  fp->_lbfsize = 0;
sl@0: 	}
sl@0:       fp->_flags |= __SRD;
sl@0:     }
sl@0:   else
sl@0:     {
sl@0:       /*
sl@0:        * We were reading.  If there is an ungetc buffer,
sl@0:        * we must have been reading from that.  Drop it,
sl@0:        * restoring the previous buffer (if any).  If there
sl@0:        * is anything in that buffer, return.
sl@0:        */
sl@0:       if (HASUB (fp))
sl@0: 	{
sl@0: 	  FREEUB (fp);
sl@0: 	  if ((fp->_r = fp->_ur) != 0)
sl@0: 	    {
sl@0: 	      fp->_p = fp->_up;
sl@0: 	      return 0;
sl@0: 	    }
sl@0: 	}
sl@0:     }
sl@0: 
sl@0:   if (fp->_bf._base == NULL)
sl@0:     __smakebuf (fp);
sl@0: 
sl@0:   /*
sl@0:    * Before reading from a line buffered or unbuffered file,
sl@0:    * flush all line buffered output files, per the ANSI C
sl@0:    * standard.
sl@0:    */
sl@0: 
sl@0:   if (fp->_flags & (__SLBF | __SNBF))
sl@0:     (void) _fwalk (fp->_data, lflush);
sl@0:   fp->_p = fp->_bf._base;
sl@0:   fp->_r = (*fp->_read) (fp->_cookie, (char *) fp->_p, fp->_bf._size);
sl@0:   fp->_flags &= ~__SMOD;	/* buffer contents are again pristine */
sl@0:   if (fp->_r <= 0)
sl@0:     {
sl@0:       if (fp->_r == 0)
sl@0: 	fp->_flags |= __SEOF;
sl@0:       else
sl@0: 	{
sl@0: 	  fp->_r = 0;
sl@0: 	  fp->_flags |= __SERR;
sl@0: 	}
sl@0:       return EOF;
sl@0:     }
sl@0:   return 0;
sl@0: }