Rev 4874 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 1990 The Regents of the University of California. |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms are permitted |
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| 6 | * provided that the above copyright notice and this paragraph are |
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| 7 | * duplicated in all such forms and that any documentation, |
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| 8 | * advertising materials, and other materials related to such |
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| 9 | * distribution and use acknowledge that the software was developed |
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| 10 | * by the University of California, Berkeley. The name of the |
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| 11 | * University may not be used to endorse or promote products derived |
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| 12 | * from this software without specific prior written permission. |
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| 13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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| 14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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| 15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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| 16 | */ |
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| 17 | /* No user fns here. Pesch 15apr92. */ |
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| 18 | |||
| 19 | #include <_ansi.h> |
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| 20 | #include |
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| 21 | #include |
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| 22 | #include |
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| 23 | #include "local.h" |
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| 24 | |||
| 25 | static int |
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| 26 | _DEFUN(lflush, (fp), |
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| 27 | FILE *fp) |
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| 28 | { |
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| 29 | if ((fp->_flags & (__SLBF | __SWR)) == (__SLBF | __SWR)) |
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| 30 | return fflush (fp); |
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| 31 | return 0; |
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| 32 | } |
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| 33 | |||
| 34 | /* |
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| 35 | * Refill a stdio buffer. |
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| 36 | * Return EOF on eof or error, 0 otherwise. |
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| 37 | */ |
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| 38 | |||
| 39 | int |
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| 40 | _DEFUN(__srefill_r, (ptr, fp), |
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| 41 | struct _reent * ptr _AND |
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| 42 | register FILE * fp) |
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| 43 | { |
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| 44 | /* make sure stdio is set up */ |
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| 45 | |||
| 46 | CHECK_INIT (ptr, fp); |
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| 47 | |||
| 48 | ORIENT (fp, -1); |
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| 49 | |||
| 50 | fp->_r = 0; /* largely a convenience for callers */ |
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| 51 | |||
| 52 | #ifndef __CYGWIN__ |
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| 53 | /* SysV does not make this test; take it out for compatibility */ |
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| 54 | if (fp->_flags & __SEOF) |
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| 55 | return EOF; |
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| 56 | #endif |
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| 57 | |||
| 58 | /* if not already reading, have to be reading and writing */ |
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| 59 | if ((fp->_flags & __SRD) == 0) |
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| 60 | { |
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| 61 | if ((fp->_flags & __SRW) == 0) |
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| 62 | { |
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| 63 | ptr->_errno = EBADF; |
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| 64 | fp->_flags |= __SERR; |
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| 65 | return EOF; |
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| 66 | } |
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| 67 | /* switch to reading */ |
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| 68 | if (fp->_flags & __SWR) |
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| 69 | { |
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| 70 | if (_fflush_r (ptr, fp)) |
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| 71 | return EOF; |
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| 72 | fp->_flags &= ~__SWR; |
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| 73 | fp->_w = 0; |
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| 74 | fp->_lbfsize = 0; |
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| 75 | } |
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| 76 | fp->_flags |= __SRD; |
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| 77 | } |
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| 78 | else |
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| 79 | { |
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| 80 | /* |
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| 81 | * We were reading. If there is an ungetc buffer, |
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| 82 | * we must have been reading from that. Drop it, |
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| 83 | * restoring the previous buffer (if any). If there |
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| 84 | * is anything in that buffer, return. |
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| 85 | */ |
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| 86 | if (HASUB (fp)) |
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| 87 | { |
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| 88 | FREEUB (ptr, fp); |
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| 89 | if ((fp->_r = fp->_ur) != 0) |
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| 90 | { |
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| 91 | fp->_p = fp->_up; |
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| 92 | return 0; |
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| 93 | } |
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| 94 | } |
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| 95 | } |
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| 96 | |||
| 97 | if (fp->_bf._base == NULL) |
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| 98 | __smakebuf_r (ptr, fp); |
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| 99 | |||
| 100 | /* |
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| 101 | * Before reading from a line buffered or unbuffered file, |
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| 102 | * flush all line buffered output files, per the ANSI C |
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| 103 | * standard. |
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| 104 | */ |
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| 105 | if (fp->_flags & (__SLBF | __SNBF)) |
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| 106 | { |
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| 107 | /* Ignore this file in _fwalk to avoid potential deadlock. */ |
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| 108 | short orig_flags = fp->_flags; |
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| 109 | fp->_flags = 1; |
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| 6099 | serge | 110 | _CAST_VOID _fwalk (_GLOBAL_REENT, lflush); |
| 4349 | Serge | 111 | fp->_flags = orig_flags; |
| 112 | |||
| 113 | /* Now flush this file without locking it. */ |
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| 114 | if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR)) |
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| 115 | __sflush_r (ptr, fp); |
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| 116 | } |
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| 117 | |||
| 118 | fp->_p = fp->_bf._base; |
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| 119 | fp->_r = fp->_read (ptr, fp->_cookie, (char *) fp->_p, fp->_bf._size); |
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| 120 | #ifndef __CYGWIN__ |
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| 121 | if (fp->_r <= 0) |
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| 122 | #else |
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| 123 | if (fp->_r > 0) |
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| 124 | fp->_flags &= ~__SEOF; |
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| 125 | else |
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| 126 | #endif |
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| 127 | { |
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| 128 | if (fp->_r == 0) |
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| 129 | fp->_flags |= __SEOF; |
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| 130 | else |
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| 131 | { |
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| 132 | fp->_r = 0; |
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| 133 | fp->_flags |= __SERR; |
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| 134 | } |
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| 135 | return EOF; |
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| 136 | } |
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| 137 | return 0; |
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| 138 | } |