1/*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Chris Torek.
7 *
8 * Redistribution and use in source and binary forms, with or without

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34 * SUCH DAMAGE.
35 */
36
37#if defined(LIBC_SCCS) && !defined(lint)
38#if 0
39static char sccsid[] = "@(#)refill.c 8.1 (Berkeley) 6/4/93";
40#endif
41static const char rcsid[] =
42 "$FreeBSD: head/lib/libc/stdio/refill.c 71579 2001-01-24 13:01:12Z deischen $";
43#endif /* LIBC_SCCS and not lint */
44
45#include <errno.h>
46#include <stdio.h>
47#include <stdlib.h>
48
49#include "local.h"
50
51static int lflush __P((FILE *));
52
53static int
54lflush(fp)
55 FILE *fp;
56{
57
58 if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR))
59 return (__sflush(fp));
60 return (0);
61}
62
63/*
64 * Refill a stdio buffer.
65 * Return EOF on eof or error, 0 otherwise.
66 */
67int
68__srefill(fp)
69 register FILE *fp;
70{
71
72 /* make sure stdio is set up */
73 if (!__sdidinit)
74 __sinit();
75
76 fp->_r = 0; /* largely a convenience for callers */
77
78 /* SysV does not make this test; take it out for compatibility */
79 if (fp->_flags & __SEOF)

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114 if (fp->_bf._base == NULL)
115 __smakebuf(fp);
116
117 /*
118 * Before reading from a line buffered or unbuffered file,
119 * flush all line buffered output files, per the ANSI C
120 * standard.
121 */
122 if (fp->_flags & (__SLBF|__SNBF))
123 (void) _fwalk(lflush);
124 fp->_p = fp->_bf._base;
125 fp->_r = (*fp->_read)(fp->_cookie, (char *)fp->_p, fp->_bf._size);
126 fp->_flags &= ~__SMOD; /* buffer contents are again pristine */
127 if (fp->_r <= 0) {
128 if (fp->_r == 0)
129 fp->_flags |= __SEOF;
130 else {
131 fp->_r = 0;
132 fp->_flags |= __SERR;
133 }
134 return (EOF);
135 }
136 return (0);
137}