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diff --git a/libio/strfile.h b/libio/strfile.h
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+/*
+Copyright (C) 1993 Free Software Foundation
+
+This file is part of the GNU IO Library. This library is free
+software; you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+This 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this library; see the file COPYING. If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+As a special exception, if you link this library with files
+compiled with a GNU compiler to produce an executable, this does not cause
+the resulting executable to be covered by the GNU General Public License.
+This exception does not however invalidate any other reasons why
+the executable file might be covered by the GNU General Public License. */
+
+#include <libio.h>
+#ifdef TODO
+Merge into libio.h ?
+#endif
+
+typedef void *(*_IO_alloc_type) __P((_IO_size_t));
+typedef void (*_IO_free_type) __P((void*));
+
+struct _IO_str_fields
+{
+ _IO_alloc_type _allocate_buffer;
+ _IO_free_type _free_buffer;
+};
+
+/* This is needed for the Irix6 N32 ABI, which has a 64 bit off_t type,
+ but a 32 bit pointer type. In this case, we get 4 bytes of padding
+ after the vtable pointer. Putting them in a structure together solves
+ this problem. */
+
+struct _IO_streambuf
+{
+ struct _IO_FILE _f;
+ const void *_vtable;
+};
+
+typedef struct _IO_strfile_
+{
+ struct _IO_streambuf _sbf;
+ struct _IO_str_fields _s;
+} _IO_strfile;
+
+/* dynamic: set when the array object is allocated (or reallocated) as
+ necessary to hold a character sequence that can change in length. */
+#define _IO_STR_DYNAMIC(FP) ((FP)->_s._allocate_buffer != (_IO_alloc_type)0)
+
+/* frozen: set when the program has requested that the array object not
+ be altered, reallocated, or freed. */
+#define _IO_STR_FROZEN(FP) ((FP)->_f._IO_file_flags & _IO_USER_BUF)