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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9 * modification, are permitted provided that the following conditions
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18 * This product includes software developed by the University of
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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 1.7 2005/05/09 12:43:40 davidxu Exp $
47 static int lflush (FILE *);
53 if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR))
54 return (__sflush(fp));
59 * Refill a stdio buffer.
60 * Return EOF on eof or error, 0 otherwise.
66 /* make sure stdio is set up */
70 fp->_r = 0; /* largely a convenience for callers */
72 /* SysV does not make this test; take it out for compatibility */
73 if (fp->_flags & __SEOF)
76 /* if not already reading, have to be reading and writing */
77 if ((fp->_flags & __SRD) == 0) {
78 if ((fp->_flags & __SRW) == 0) {
83 /* switch to reading */
84 if (fp->_flags & __SWR) {
94 * We were reading. If there is an ungetc buffer,
95 * we must have been reading from that. Drop it,
96 * restoring the previous buffer (if any). If there
97 * is anything in that buffer, return.
101 if ((fp->_r = fp->_ur) != 0) {
102 fp->_p = fp->_extra->_up;
108 if (fp->_bf._base == NULL)
112 * Before reading from a line buffered or unbuffered file,
113 * flush all line buffered output files, per the ANSI C
116 if (fp->_flags & (__SLBF|__SNBF))
117 (void) _fwalk(lflush);
118 fp->_p = fp->_bf._base;
119 fp->_r = (*fp->_read)(fp->_cookie, (char *)fp->_p, fp->_bf._size);
120 fp->_flags &= ~__SMOD; /* buffer contents are again pristine */
123 fp->_flags |= __SEOF;
126 fp->_flags |= __SERR;