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glibc-2.36
libio/filedoalloc.c
107 строк
4 KB
Paul Eggert
Update copyright dates with scripts/update-copyrights
01 янв 2022, 22:40
01 янв 2022, 22:40
581c785
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/* Copyright (C) 1993-2022 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. As a special exception, if you link the code in this file with files compiled with a GNU compiler to produce an executable, that does not cause the resulting executable to be covered by the GNU Lesser General Public License. This exception does not however invalidate any other reasons why the executable file might be covered by the GNU Lesser General Public License. This exception applies to code released by its copyright holders in files containing the exception. */ /* Copyright (C) 1990 The Regents of the University of California. All rights reserved. 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. 4. 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.*/ /* Modified for GNU iostream by Per Bothner 1991, 1992. */ #include "libioP.h" #include <device-nrs.h> #include <sys/stat.h> #include <stdlib.h> #include <unistd.h> /* Return the result of isatty, without changing errno. */ static int local_isatty (int fd) { int save_errno = errno; int res = __isatty (fd); __set_errno (save_errno); return res; } /* Allocate a file buffer, or switch to unbuffered I/O. Streams for TTY devices default to line buffered. */ int _IO_file_doallocate (FILE *fp) { size_t size; char *p; struct __stat64_t64 st; size = BUFSIZ; if (fp->_fileno >= 0 && __builtin_expect (_IO_SYSSTAT (fp, &st), 0) >= 0) { if (S_ISCHR (st.st_mode)) { /* Possibly a tty. */ if ( #ifdef DEV_TTY_P DEV_TTY_P (&st) || #endif local_isatty (fp->_fileno)) fp->_flags |= _IO_LINE_BUF; } #if defined _STATBUF_ST_BLKSIZE if (st.st_blksize > 0 && st.st_blksize < BUFSIZ) size = st.st_blksize; #endif } p = malloc (size); if (__glibc_unlikely (p == NULL)) return EOF; _IO_setb (fp, p, p + size, 1); return 1; } libc_hidden_def (_IO_file_doallocate)