Rev 4921 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 1990, 2007 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 |
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| 24 | #include |
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| 25 | #include "local.h" |
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| 26 | |||
| 27 | #define _DEFAULT_ASPRINTF_BUFSIZE 64 |
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| 28 | |||
| 29 | /* |
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| 30 | * Allocate a file buffer, or switch to unbuffered I/O. |
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| 31 | * Per the ANSI C standard, ALL tty devices default to line buffered. |
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| 32 | * |
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| 33 | * As a side effect, we set __SOPT or __SNPT (en/dis-able fseek |
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| 34 | * optimization) right after the _fstat() that finds the buffer size. |
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| 35 | */ |
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| 36 | |||
| 37 | _VOID |
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| 38 | _DEFUN(__smakebuf_r, (ptr, fp), |
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| 39 | struct _reent *ptr _AND |
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| 40 | register FILE *fp) |
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| 41 | { |
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| 42 | register _PTR p; |
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| 6536 | serge | 43 | int flags; |
| 44 | size_t size; |
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| 45 | int couldbetty; |
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| 4349 | Serge | 46 | |
| 47 | if (fp->_flags & __SNBF) |
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| 48 | { |
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| 49 | fp->_bf._base = fp->_p = fp->_nbuf; |
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| 50 | fp->_bf._size = 1; |
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| 51 | return; |
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| 52 | } |
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| 6536 | serge | 53 | flags = __swhatbuf_r (ptr, fp, &size, &couldbetty); |
| 4349 | Serge | 54 | if ((p = _malloc_r (ptr, size)) == NULL) |
| 55 | { |
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| 56 | if (!(fp->_flags & __SSTR)) |
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| 57 | { |
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| 58 | fp->_flags |= __SNBF; |
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| 59 | fp->_bf._base = fp->_p = fp->_nbuf; |
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| 60 | fp->_bf._size = 1; |
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| 61 | } |
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| 62 | } |
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| 63 | else |
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| 64 | { |
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| 65 | ptr->__cleanup = _cleanup_r; |
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| 66 | fp->_flags |= __SMBF; |
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| 67 | fp->_bf._base = fp->_p = (unsigned char *) p; |
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| 68 | fp->_bf._size = size; |
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| 69 | if (couldbetty && _isatty_r (ptr, fp->_file)) |
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| 70 | fp->_flags |= __SLBF; |
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| 6536 | serge | 71 | fp->_flags |= flags; |
| 4349 | Serge | 72 | } |
| 73 | } |
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| 6536 | serge | 74 | |
| 75 | /* |
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| 76 | * Internal routine to determine `proper' buffering for a file. |
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| 77 | */ |
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| 78 | int |
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| 79 | _DEFUN(__swhatbuf_r, (ptr, fp, bufsize, couldbetty), |
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| 80 | struct _reent *ptr _AND |
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| 81 | FILE *fp _AND |
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| 82 | size_t *bufsize _AND |
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| 83 | int *couldbetty) |
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| 84 | { |
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| 85 | #ifdef _FSEEK_OPTIMIZATION |
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| 86 | const int snpt = __SNPT; |
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| 87 | #else |
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| 88 | const int snpt = 0; |
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| 89 | #endif |
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| 90 | |||
| 91 | #ifdef __USE_INTERNAL_STAT64 |
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| 92 | struct stat64 st; |
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| 93 | |||
| 94 | if (fp->_file < 0 || _fstat64_r (ptr, fp->_file, &st) < 0) |
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| 95 | #else |
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| 96 | struct stat st; |
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| 97 | |||
| 98 | if (fp->_file < 0 || _fstat_r (ptr, fp->_file, &st) < 0) |
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| 99 | #endif |
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| 100 | { |
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| 101 | *couldbetty = 0; |
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| 102 | /* Check if we are be called by asprintf family for initial buffer. */ |
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| 103 | if (fp->_flags & __SMBF) |
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| 104 | *bufsize = _DEFAULT_ASPRINTF_BUFSIZE; |
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| 105 | else |
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| 106 | *bufsize = BUFSIZ; |
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| 107 | return (0); |
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| 108 | } |
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| 109 | |||
| 110 | /* could be a tty iff it is a character device */ |
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| 111 | *couldbetty = S_ISCHR(st.st_mode); |
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| 112 | #ifdef HAVE_BLKSIZE |
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| 113 | if (st.st_blksize > 0) |
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| 114 | { |
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| 115 | /* |
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| 116 | * Optimise fseek() only if it is a regular file. (The test for |
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| 117 | * __sseek is mainly paranoia.) It is safe to set _blksize |
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| 118 | * unconditionally; it will only be used if __SOPT is also set. |
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| 119 | */ |
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| 120 | *bufsize = st.st_blksize; |
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| 121 | fp->_blksize = st.st_blksize; |
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| 122 | return ((st.st_mode & S_IFMT) == S_IFREG ? __SOPT : snpt); |
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| 123 | } |
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| 124 | #endif |
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| 125 | *bufsize = BUFSIZ; |
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| 126 | return (snpt); |
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| 127 | } |