Edit File: struct_FILE.h
/* Copyright (C) 1991-2018 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/>. */ #ifndef __struct_FILE_defined #define __struct_FILE_defined 1 /* Caution: The contents of this file are not part of the official stdio.h API. However, much of it is part of the official *binary* interface, and therefore cannot be changed. */ #if defined _IO_USE_OLD_IO_FILE && !defined _LIBC # error "_IO_USE_OLD_IO_FILE should only be defined when building libc itself" #endif #if defined _IO_lock_t_defined && !defined _LIBC # error "_IO_lock_t_defined should only be defined when building libc itself" #endif #include <bits/types.h> struct _IO_FILE; struct _IO_marker; struct _IO_codecvt; struct _IO_wide_data; /* During the build of glibc itself, _IO_lock_t will already have been defined by internal headers. */ #ifndef _IO_lock_t_defined typedef void _IO_lock_t; #endif /* The tag name of this struct is _IO_FILE to preserve historic C++ mangled names for functions taking FILE* arguments. That name should not be used in new code. */ struct _IO_FILE { int _flags; /* High-order word is _IO_MAGIC; rest is flags. */ /* The following pointers correspond to the C++ streambuf protocol. */ char *_IO_read_ptr; /* Current read pointer */ char *_IO_read_end; /* End of get area. */ char *_IO_read_base; /* Start of putback+get area. */ char *_IO_write_base; /* Start of put area. */ char *_IO_write_ptr; /* Current put pointer. */ char *_IO_write_end; /* End of put area. */ char *_IO_buf_base; /* Start of reserve area. */ char *_IO_buf_end; /* End of reserve area. */ /* The following fields are used to support backing up and undo. */ char *_IO_save_base; /* Pointer to start of non-current get area. */ char *_IO_backup_base; /* Pointer to first valid character of backup area */ char *_IO_save_end; /* Pointer to end of non-current get area. */ struct _IO_marker *_markers; struct _IO_FILE *_chain; int _fileno; int _flags2; __off_t _old_offset; /* This used to be _offset but it's too small. */ /* 1+column number of pbase(); 0 is unknown. */ unsigned short _cur_column; signed char _vtable_offset; char _shortbuf[1]; _IO_lock_t *_lock; #ifdef _IO_USE_OLD_IO_FILE }; struct _IO_FILE_complete { struct _IO_FILE _file; #endif __off64_t _offset; /* Wide character stream stuff. */ struct _IO_codecvt *_codecvt; struct _IO_wide_data *_wide_data; struct _IO_FILE *_freeres_list; void *_freeres_buf; size_t __pad5; int _mode; /* Make sure we don't get into trouble again. */ char _unused2[15 * sizeof (int) - 4 * sizeof (void *) - sizeof (size_t)]; }; /* These macros are used by bits/stdio.h and internal headers. */ #define __getc_unlocked_body(_fp) \ (__glibc_unlikely ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end) \ ? __uflow (_fp) : *(unsigned char *) (_fp)->_IO_read_ptr++) #define __putc_unlocked_body(_ch, _fp) \ (__glibc_unlikely ((_fp)->_IO_write_ptr >= (_fp)->_IO_write_end) \ ? __overflow (_fp, (unsigned char) (_ch)) \ : (unsigned char) (*(_fp)->_IO_write_ptr++ = (_ch))) #define _IO_EOF_SEEN 0x0010 #define __feof_unlocked_body(_fp) (((_fp)->_flags & _IO_EOF_SEEN) != 0) #define _IO_ERR_SEEN 0x0020 #define __ferror_unlocked_body(_fp) (((_fp)->_flags & _IO_ERR_SEEN) != 0) #define _IO_USER_LOCK 0x8000 /* Many more flag bits are defined internally. */ #endif
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