diff options
Diffstat (limited to 'REORG.TODO/libio/iosetvbuf.c')
-rw-r--r-- | REORG.TODO/libio/iosetvbuf.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/REORG.TODO/libio/iosetvbuf.c b/REORG.TODO/libio/iosetvbuf.c new file mode 100644 index 0000000000..b242018c0b --- /dev/null +++ b/REORG.TODO/libio/iosetvbuf.c @@ -0,0 +1,100 @@ +/* Copyright (C) 1993-2017 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 + <http://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. */ + +#include "libioP.h" + +#define _IOFBF 0 /* Fully buffered. */ +#define _IOLBF 1 /* Line buffered. */ +#define _IONBF 2 /* No buffering. */ + +int +_IO_setvbuf (_IO_FILE *fp, char *buf, int mode, _IO_size_t size) +{ + int result; + CHECK_FILE (fp, EOF); + _IO_acquire_lock (fp); + switch (mode) + { + case _IOFBF: + fp->_IO_file_flags &= ~(_IO_LINE_BUF|_IO_UNBUFFERED); + if (buf == NULL) + { + if (fp->_IO_buf_base == NULL) + { + /* There is no flag to distinguish between "fully buffered + mode has been explicitly set" as opposed to "line + buffering has not been explicitly set". In both + cases, _IO_LINE_BUF is off. If this is a tty, and + _IO_filedoalloc later gets called, it cannot know if + it should set the _IO_LINE_BUF flag (because that is + the default), or not (because we have explicitly asked + for fully buffered mode). So we make sure a buffer + gets allocated now, and explicitly turn off line + buffering. + + A possibly cleaner alternative would be to add an + extra flag, but then flags are a finite resource. */ + if (_IO_DOALLOCATE (fp) < 0) + { + result = EOF; + goto unlock_return; + } + fp->_IO_file_flags &= ~_IO_LINE_BUF; + } + result = 0; + goto unlock_return; + } + break; + case _IOLBF: + fp->_IO_file_flags &= ~_IO_UNBUFFERED; + fp->_IO_file_flags |= _IO_LINE_BUF; + if (buf == NULL) + { + result = 0; + goto unlock_return; + } + break; + case _IONBF: + fp->_IO_file_flags &= ~_IO_LINE_BUF; + fp->_IO_file_flags |= _IO_UNBUFFERED; + buf = NULL; + size = 0; + break; + default: + result = EOF; + goto unlock_return; + } + result = _IO_SETBUF (fp, buf, size) == NULL ? EOF : 0; + +unlock_return: + _IO_release_lock (fp); + return result; +} +libc_hidden_def (_IO_setvbuf) + +#ifdef weak_alias +weak_alias (_IO_setvbuf, setvbuf) +#endif |