diff options
Diffstat (limited to 'libc/stdio/makebuf.c')
| -rw-r--r-- | libc/stdio/makebuf.c | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/libc/stdio/makebuf.c b/libc/stdio/makebuf.c deleted file mode 100644 index d47e27c..0000000 --- a/libc/stdio/makebuf.c +++ /dev/null @@ -1,107 +0,0 @@ -/* $OpenBSD: makebuf.c,v 1.8 2005/12/28 18:50:22 millert Exp $ */ -/*- - * Copyright (c) 1990, 1993 - * The Regents of the University of California. All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * Chris Torek. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#include <sys/types.h> -#include <sys/stat.h> -#include <unistd.h> -#include <stdio.h> -#include <stdlib.h> -#include "local.h" - -/* - * Allocate a file buffer, or switch to unbuffered I/O. - * Per the ANSI C standard, ALL tty devices default to line buffered. - * - * As a side effect, we set __SOPT or __SNPT (en/dis-able fseek - * optimisation) right after the fstat() that finds the buffer size. - */ -void -__smakebuf(FILE *fp) -{ - void *p; - int flags; - size_t size; - int couldbetty; - - if (fp->_flags & __SNBF) { - fp->_bf._base = fp->_p = fp->_nbuf; - fp->_bf._size = 1; - return; - } - flags = __swhatbuf(fp, &size, &couldbetty); - if ((p = malloc(size)) == NULL) { - fp->_flags |= __SNBF; - fp->_bf._base = fp->_p = fp->_nbuf; - fp->_bf._size = 1; - return; - } - __atexit_register_cleanup(_cleanup); - flags |= __SMBF; - fp->_bf._base = fp->_p = p; - fp->_bf._size = size; - if (couldbetty && isatty(fp->_file)) - flags |= __SLBF; - fp->_flags |= flags; -} - -/* - * Internal routine to determine `proper' buffering for a file. - */ -int -__swhatbuf(FILE *fp, size_t *bufsize, int *couldbetty) -{ - struct stat st; - - if (fp->_file < 0 || fstat(fp->_file, &st) < 0) { - *couldbetty = 0; - *bufsize = BUFSIZ; - return (__SNPT); - } - - /* could be a tty iff it is a character device */ - *couldbetty = S_ISCHR(st.st_mode); - if (st.st_blksize == 0) { - *bufsize = BUFSIZ; - return (__SNPT); - } - - /* - * Optimise fseek() only if it is a regular file. (The test for - * __sseek is mainly paranoia.) It is safe to set _blksize - * unconditionally; it will only be used if __SOPT is also set. - */ - *bufsize = st.st_blksize; - fp->_blksize = st.st_blksize; - return ((st.st_mode & S_IFMT) == S_IFREG && fp->_seek == __sseek ? - __SOPT : __SNPT); -} |