2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
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36 * @(#)refill.c 8.1 (Berkeley) 6/4/93
37 * $FreeBSD: src/lib/libc/stdio/refill.c,v 1.8.2.1 2001/03/05 11:27:49 obrien Exp $
38 * $DragonFly: src/lib/libc/stdio/refill.c,v 1.10 2005/11/20 11:07:30 swildner Exp $
46 #include "priv_stdio.h"
48 static int lflush (FILE *);
54 if ((fp->pub._flags & (__SLBF|__SWR)) == (__SLBF|__SWR))
55 return (__sflush(fp));
60 * Refill a stdio buffer.
61 * Return EOF on eof or error, 0 otherwise.
67 /* make sure stdio is set up */
71 fp->pub._r = 0; /* largely a convenience for callers */
73 /* SysV does not make this test; take it out for compatibility */
74 if (fp->pub._flags & __SEOF)
77 /* if not already reading, have to be reading and writing */
78 if ((fp->pub._flags & __SRD) == 0) {
79 if ((fp->pub._flags & __SRW) == 0) {
81 fp->pub._flags |= __SERR;
84 /* switch to reading */
85 if (fp->pub._flags & __SWR) {
88 fp->pub._flags &= ~__SWR;
92 fp->pub._flags |= __SRD;
95 * We were reading. If there is an ungetc buffer,
96 * we must have been reading from that. Drop it,
97 * restoring the previous buffer (if any). If there
98 * is anything in that buffer, return.
102 if ((fp->pub._r = fp->_ur) != 0) {
103 fp->pub._p = fp->_up;
109 if (fp->_bf._base == NULL)
113 * Before reading from a line buffered or unbuffered file,
114 * flush all line buffered output files, per the ANSI C
117 if (fp->pub._flags & (__SLBF|__SNBF))
119 fp->pub._p = fp->_bf._base;
120 fp->pub._r = (*fp->_read)(fp->_cookie, (char *)fp->pub._p, fp->_bf._size);
121 fp->pub._flags &= ~__SMOD; /* buffer contents are again pristine */
122 if (fp->pub._r <= 0) {
124 fp->pub._flags |= __SEOF;
127 fp->pub._flags |= __SERR;