Go to most recent revision | Details | 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. |
||
| 3 | * All rights reserved. |
||
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms are permitted |
||
| 6 | * provided that the above copyright notice and this paragraph are |
||
| 7 | * duplicated in all such forms and that any documentation, |
||
| 8 | * advertising materials, and other materials related to such |
||
| 9 | * distribution and use acknowledge that the software was developed |
||
| 10 | * by the University of California, Berkeley. The name of the |
||
| 11 | * University may not be used to endorse or promote products derived |
||
| 12 | * from this software without specific prior written permission. |
||
| 13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
||
| 14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
||
| 15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
||
| 16 | */ |
||
| 17 | /* No user fns here. Pesch 15apr92. */ |
||
| 18 | |||
| 19 | #include <_ansi.h> |
||
| 20 | #include |
||
| 21 | #include |
||
| 22 | #include |
||
| 23 | #include |
||
| 24 | #include |
||
| 25 | #include "local.h" |
||
| 26 | |||
| 27 | #define _DEFAULT_ASPRINTF_BUFSIZE 64 |
||
| 28 | |||
| 29 | /* |
||
| 30 | * Allocate a file buffer, or switch to unbuffered I/O. |
||
| 31 | * Per the ANSI C standard, ALL tty devices default to line buffered. |
||
| 32 | * |
||
| 33 | * As a side effect, we set __SOPT or __SNPT (en/dis-able fseek |
||
| 34 | * optimization) right after the _fstat() that finds the buffer size. |
||
| 35 | */ |
||
| 36 | |||
| 37 | _VOID |
||
| 38 | _DEFUN(__smakebuf_r, (ptr, fp), |
||
| 39 | struct _reent *ptr _AND |
||
| 40 | register FILE *fp) |
||
| 41 | { |
||
| 42 | register size_t size, couldbetty; |
||
| 43 | register _PTR p; |
||
| 44 | #ifdef __USE_INTERNAL_STAT64 |
||
| 45 | struct stat64 st; |
||
| 46 | #else |
||
| 47 | struct stat st; |
||
| 48 | #endif |
||
| 49 | |||
| 50 | if (fp->_flags & __SNBF) |
||
| 51 | { |
||
| 52 | fp->_bf._base = fp->_p = fp->_nbuf; |
||
| 53 | fp->_bf._size = 1; |
||
| 54 | return; |
||
| 55 | } |
||
| 56 | #ifdef __USE_INTERNAL_STAT64 |
||
| 57 | if (fp->_file < 0 || _fstat64_r (ptr, fp->_file, &st) < 0) |
||
| 58 | #else |
||
| 59 | if (fp->_file < 0 || _fstat_r (ptr, fp->_file, &st) < 0) |
||
| 60 | #endif |
||
| 61 | { |
||
| 62 | couldbetty = 0; |
||
| 63 | /* Check if we are be called by asprintf family for initial buffer. */ |
||
| 64 | if (fp->_flags & __SMBF) |
||
| 65 | size = _DEFAULT_ASPRINTF_BUFSIZE; |
||
| 66 | else |
||
| 67 | size = BUFSIZ; |
||
| 68 | /* do not try to optimise fseek() */ |
||
| 69 | fp->_flags |= __SNPT; |
||
| 70 | } |
||
| 71 | else |
||
| 72 | { |
||
| 73 | couldbetty = (st.st_mode & S_IFMT) == S_IFCHR; |
||
| 74 | #ifdef HAVE_BLKSIZE |
||
| 75 | size = st.st_blksize <= 0 ? BUFSIZ : st.st_blksize; |
||
| 76 | #else |
||
| 77 | size = BUFSIZ; |
||
| 78 | #endif |
||
| 79 | /* |
||
| 80 | * Optimize fseek() only if it is a regular file. |
||
| 81 | * (The test for __sseek is mainly paranoia.) |
||
| 82 | */ |
||
| 83 | if ((st.st_mode & S_IFMT) == S_IFREG && fp->_seek == __sseek) |
||
| 84 | { |
||
| 85 | fp->_flags |= __SOPT; |
||
| 86 | #ifdef HAVE_BLKSIZE |
||
| 87 | fp->_blksize = st.st_blksize; |
||
| 88 | #else |
||
| 89 | fp->_blksize = 1024; |
||
| 90 | #endif |
||
| 91 | } |
||
| 92 | else |
||
| 93 | fp->_flags |= __SNPT; |
||
| 94 | } |
||
| 95 | if ((p = _malloc_r (ptr, size)) == NULL) |
||
| 96 | { |
||
| 97 | if (!(fp->_flags & __SSTR)) |
||
| 98 | { |
||
| 99 | fp->_flags |= __SNBF; |
||
| 100 | fp->_bf._base = fp->_p = fp->_nbuf; |
||
| 101 | fp->_bf._size = 1; |
||
| 102 | } |
||
| 103 | } |
||
| 104 | else |
||
| 105 | { |
||
| 106 | ptr->__cleanup = _cleanup_r; |
||
| 107 | fp->_flags |= __SMBF; |
||
| 108 | fp->_bf._base = fp->_p = (unsigned char *) p; |
||
| 109 | fp->_bf._size = size; |
||
| 110 | if (couldbetty && _isatty_r (ptr, fp->_file)) |
||
| 111 | fp->_flags |= __SLBF; |
||
| 112 | } |
||
| 113 | } |