+++ /dev/null
-/** @file\r
- Implementation of internal file buffer allocation functions.\r
-\r
- Copyright (c) 2010 - 2012, Intel Corporation. All rights reserved.<BR>\r
- This program and the accompanying materials are licensed and made available\r
- under the terms and conditions of the BSD License that accompanies this\r
- distribution. The full text of the license may be found at\r
- http://opensource.org/licenses/bsd-license.\r
-\r
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
-\r
- Copyright (c) 1990, 1993\r
- The Regents of the University of California. All rights reserved.\r
-\r
- This code is derived from software contributed to Berkeley by\r
- Chris Torek.\r
-\r
- Redistribution and use in source and binary forms, with or without\r
- modification, are permitted provided that the following conditions\r
- are met:\r
- - Redistributions of source code must retain the above copyright\r
- notice, this list of conditions and the following disclaimer.\r
- - Redistributions in binary form must reproduce the above copyright\r
- notice, this list of conditions and the following disclaimer in the\r
- documentation and/or other materials provided with the distribution.\r
- - Neither the name of the University nor the names of its contributors\r
- may be used to endorse or promote products derived from this software\r
- without specific prior written permission.\r
-\r
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"\r
- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r
- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r
- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE\r
- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR\r
- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF\r
- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS\r
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\r
- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\r
- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE\r
- POSSIBILITY OF SUCH DAMAGE.\r
-\r
- NetBSD: makebuf.c,v 1.14 2003/08/07 16:43:28 agc Exp\r
- makebuf.c 8.1 (Berkeley) 6/4/93\r
-**/\r
-#include <LibConfig.h>\r
-\r
-#include "namespace.h"\r
-\r
-#include <sys/types.h>\r
-#include <sys/stat.h>\r
-#include <assert.h>\r
-#include <stdio.h>\r
-#include <stdlib.h>\r
-#include <unistd.h>\r
-#include "reentrant.h"\r
-#include "local.h"\r
-#include <MainData.h>\r
-\r
-/*\r
- * Allocate a file buffer, or switch to unbuffered I/O.\r
- * Per the ANSI C standard, ALL tty devices default to line buffered.\r
- *\r
- * As a side effect, we set __SOPT or __SNPT (en/dis-able fseek\r
- * optimisation) right after the fstat() that finds the buffer size.\r
- */\r
-void\r
-__smakebuf(FILE *fp)\r
-{\r
- void *p;\r
- int flags;\r
- size_t size;\r
- int couldbetty;\r
-\r
- _DIAGASSERT(fp != NULL);\r
-\r
- if (fp != NULL) {\r
- if (fp->_flags & __SNBF) {\r
- fp->_bf._base = fp->_p = fp->_nbuf;\r
- fp->_bf._size = MB_LEN_MAX;\r
- return;\r
- }\r
- flags = __swhatbuf(fp, &size, &couldbetty);\r
- if ((p = malloc(size)) == NULL) {\r
- // malloc failed, act unbuffered.\r
- fp->_flags |= __SNBF;\r
- fp->_bf._base = fp->_p = fp->_nbuf;\r
- fp->_bf._size = 1;\r
- return;\r
- }\r
- gMD->cleanup = _cleanup;\r
- flags |= __SMBF;\r
- fp->_bf._base = fp->_p = p;\r
- fp->_bf._size = (int)size;\r
- if (couldbetty || isatty(fp->_file))\r
- flags |= __SLBF;\r
- fp->_flags |= flags;\r
- }\r
-}\r
-\r
-/*\r
- * Internal routine to determine `proper' buffering for a file.\r
- */\r
-int\r
-__swhatbuf(FILE *fp, size_t *bufsize, int *couldbetty)\r
-{\r
- struct stat st;\r
-\r
- _DIAGASSERT(fp != NULL);\r
- _DIAGASSERT(bufsize != NULL);\r
- _DIAGASSERT(couldbetty != NULL);\r
- if(fp == NULL) {\r
- return (__SNPT);\r
- }\r
-\r
- if (fp->_file < 0 || fstat(fp->_file, &st) < 0) {\r
- *couldbetty = 0;\r
- *bufsize = BUFSIZ;\r
- return (__SNPT);\r
- }\r
-\r
- /* could be a tty iff it is a character device */\r
- *couldbetty = S_ISCHR(st.st_mode);\r
- if (st.st_blksize == 0) {\r
- *bufsize = BUFSIZ;\r
- return (__SNPT);\r
- }\r
-\r
- /*\r
- * Optimise fseek() only if it is a regular file. (The test for\r
- * __sseek is mainly paranoia.) It is safe to set _blksize\r
- * unconditionally; it will only be used if __SOPT is also set.\r
- */\r
- *bufsize = st.st_blksize;\r
- fp->_blksize = st.st_blksize;\r
- return ((st.st_mode & S_IFMT) == S_IFREG && fp->_seek == __sseek ?\r
- __SOPT : __SNPT);\r
-}\r
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