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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | /*- |
| 2 | * Copyright (c) 1990, 1993 |
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| 3 | * The Regents of the University of California. All rights reserved. |
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| 4 | * |
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| 5 | * This code is derived from software contributed to Berkeley by |
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| 6 | * Chris Torek. |
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| 7 | * |
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| 8 | * Redistribution and use in source and binary forms, with or without |
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| 9 | * modification, are permitted provided that the following conditions |
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| 10 | * are met: |
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| 11 | * 1. Redistributions of source code must retain the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer. |
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 14 | * notice, this list of conditions and the following disclaimer in the |
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| 15 | * documentation and/or other materials provided with the distribution. |
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| 16 | * 3. All advertising materials mentioning features or use of this software |
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| 17 | * must display the following acknowledgement: |
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| 18 | * This product includes software developed by the University of |
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| 19 | * California, Berkeley and its contributors. |
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| 20 | * 4. Neither the name of the University nor the names of its contributors |
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| 21 | * may be used to endorse or promote products derived from this software |
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| 22 | * without specific prior written permission. |
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| 23 | * |
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 34 | * SUCH DAMAGE. |
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| 35 | */ |
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| 36 | |||
| 37 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 38 | #if 0 |
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| 39 | static char sccsid[] = "@(#)refill.c 8.1 (Berkeley) 6/4/93"; |
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| 40 | #endif |
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| 41 | static const char rcsid[] = |
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| 42 | "$\Id: refill.c,v 1.4 1996/08/13 17:49:45 peter Exp $"; |
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| 43 | #endif /* LIBC_SCCS and not lint */ |
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| 44 | |||
| 45 | #include <errno.h> |
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| 46 | #include <stdio.h> |
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| 47 | #include <stdlib.h> |
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| 48 | #include "local.h" |
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| 49 | |||
| 50 | static int lflush __P((FILE *)); |
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| 51 | |||
| 52 | static int |
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| 53 | lflush(fp) |
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| 54 | FILE *fp; |
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| 55 | { |
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| 56 | |||
| 57 | if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR)) |
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| 58 | return (__sflush(fp)); |
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| 59 | return (0); |
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| 60 | } |
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| 61 | |||
| 62 | /* |
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| 63 | * Refill a stdio buffer. |
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| 64 | * Return EOF on eof or error, 0 otherwise. |
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| 65 | */ |
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| 66 | int |
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| 67 | __srefill(fp) |
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| 68 | register FILE *fp; |
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| 69 | { |
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| 70 | |||
| 71 | /* make sure stdio is set up */ |
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| 72 | if (!__sdidinit) |
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| 73 | __sinit(); |
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| 74 | |||
| 75 | fp->_r = 0; /* largely a convenience for callers */ |
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| 76 | |||
| 77 | /* SysV does not make this test; take it out for compatibility */ |
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| 78 | if (fp->_flags & __SEOF) |
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| 79 | return (EOF); |
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| 80 | |||
| 81 | /* if not already reading, have to be reading and writing */ |
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| 82 | if ((fp->_flags & __SRD) == 0) { |
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| 83 | if ((fp->_flags & __SRW) == 0) { |
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| 84 | errno = EBADF; |
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| 85 | return (EOF); |
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| 86 | } |
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| 87 | /* switch to reading */ |
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| 88 | if (fp->_flags & __SWR) { |
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| 89 | if (__sflush(fp)) |
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| 90 | return (EOF); |
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| 91 | fp->_flags &= ~__SWR; |
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| 92 | fp->_w = 0; |
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| 93 | fp->_lbfsize = 0; |
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| 94 | } |
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| 95 | fp->_flags |= __SRD; |
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| 96 | } else { |
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| 97 | /* |
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| 98 | * We were reading. If there is an ungetc buffer, |
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| 99 | * we must have been reading from that. Drop it, |
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| 100 | * restoring the previous buffer (if any). If there |
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| 101 | * is anything in that buffer, return. |
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| 102 | */ |
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| 103 | if (HASUB(fp)) { |
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| 104 | FREEUB(fp); |
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| 105 | if ((fp->_r = fp->_ur) != 0) { |
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| 106 | fp->_p = fp->_up; |
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| 107 | return (0); |
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| 108 | } |
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| 109 | } |
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| 110 | } |
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| 111 | |||
| 112 | if (fp->_bf._base == NULL) |
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| 113 | __smakebuf(fp); |
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| 114 | |||
| 115 | /* |
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| 116 | * Before reading from a line buffered or unbuffered file, |
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| 117 | * flush all line buffered output files, per the ANSI C |
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| 118 | * standard. |
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| 119 | */ |
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| 120 | if (fp->_flags & (__SLBF|__SNBF)) |
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| 121 | (void) _fwalk(lflush); |
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| 122 | fp->_p = fp->_bf._base; |
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| 123 | fp->_r = (*fp->_read)(fp->_cookie, (char *)fp->_p, fp->_bf._size); |
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| 124 | fp->_flags &= ~__SMOD; /* buffer contents are again pristine */ |
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| 125 | if (fp->_r <= 0) { |
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| 126 | if (fp->_r == 0) |
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| 127 | fp->_flags |= __SEOF; |
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| 128 | else { |
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| 129 | fp->_r = 0; |
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| 130 | fp->_flags |= __SERR; |
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| 131 | } |
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| 132 | return (EOF); |
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| 133 | } |
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| 134 | return (0); |
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| 135 | } |