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