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/* Copyright (C) 1993,95,97,99,2000 Free Software Foundation, Inc.
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 <libioP.h>
#include <stdio.h>
#include <stdlib.h>
/* Prototyped for local functions. */
static _IO_ssize_t _IO_cookie_read __P ((register _IO_FILE* fp, void* buf,
_IO_ssize_t size));
static _IO_ssize_t _IO_cookie_write __P ((register _IO_FILE* fp,
const void* buf, _IO_ssize_t size));
static _IO_off64_t _IO_cookie_seek __P ((_IO_FILE *fp, _IO_off64_t offset,
int dir));
static int _IO_cookie_close __P ((_IO_FILE* fp));
static _IO_ssize_t
_IO_cookie_read (fp, buf, size)
_IO_FILE *fp;
void *buf;
_IO_ssize_t size;
{
struct _IO_cookie_file *cfile = (struct _IO_cookie_file *) fp;
if (cfile->__io_functions.read == NULL)
return -1;
return cfile->__io_functions.read (cfile->__cookie, buf, size);
}
static _IO_ssize_t
_IO_cookie_write (fp, buf, size)
_IO_FILE *fp;
const void *buf;
_IO_ssize_t size;
{
struct _IO_cookie_file *cfile = (struct _IO_cookie_file *) fp;
if (cfile->__io_functions.write == NULL)
return -1;
return cfile->__io_functions.write (cfile->__cookie, buf, size);
}
static _IO_off64_t
_IO_cookie_seek (fp, offset, dir)
_IO_FILE *fp;
_IO_off64_t offset;
int dir;
{
struct _IO_cookie_file *cfile = (struct _IO_cookie_file *) fp;
return ((cfile->__io_functions.seek == NULL
|| cfile->__io_functions.seek (cfile->__cookie, &offset, dir))
? _IO_pos_BAD : offset);
}
static int
_IO_cookie_close (fp)
_IO_FILE *fp;
{
struct _IO_cookie_file *cfile = (struct _IO_cookie_file *) fp;
if (cfile->__io_functions.close == NULL)
return 0;
return cfile->__io_functions.close (cfile->__cookie);
}
static struct _IO_jump_t _IO_cookie_jumps = {
JUMP_INIT_DUMMY,
JUMP_INIT(finish, _IO_file_finish),
JUMP_INIT(overflow, _IO_file_overflow),
JUMP_INIT(underflow, _IO_file_underflow),
JUMP_INIT(uflow, _IO_default_uflow),
JUMP_INIT(pbackfail, _IO_default_pbackfail),
JUMP_INIT(xsputn, _IO_file_xsputn),
JUMP_INIT(xsgetn, _IO_default_xsgetn),
JUMP_INIT(seekoff, _IO_file_seekoff),
JUMP_INIT(seekpos, _IO_default_seekpos),
JUMP_INIT(setbuf, _IO_file_setbuf),
JUMP_INIT(sync, _IO_file_sync),
JUMP_INIT(doallocate, _IO_file_doallocate),
JUMP_INIT(read, _IO_cookie_read),
JUMP_INIT(write, _IO_cookie_write),
JUMP_INIT(seek, _IO_cookie_seek),
JUMP_INIT(close, _IO_cookie_close),
JUMP_INIT(stat, _IO_default_stat),
JUMP_INIT(showmanyc, _IO_default_showmanyc),
JUMP_INIT(imbue, _IO_default_imbue),
};
void
_IO_cookie_init (struct _IO_cookie_file *cfile, int read_write,
void *cookie, _IO_cookie_io_functions_t io_functions)
{
_IO_init (&cfile->__file, 0);
_IO_JUMPS (&cfile->__file) = &_IO_cookie_jumps;
cfile->__cookie = cookie;
cfile->__io_functions = io_functions;
_IO_file_init(&cfile->__file);
cfile->__file._IO_file_flags =
_IO_mask_flags (&cfile->__file, read_write,
_IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING);
/* We use a negative number different from -1 for _fileno to mark that
this special stream is not associated with a real file, but still has
to be treated as such. */
cfile->__file._fileno = -2;
}
_IO_FILE *
fopencookie (cookie, mode, io_functions)
void *cookie;
const char *mode;
_IO_cookie_io_functions_t io_functions;
{
int read_write;
struct locked_FILE
{
struct _IO_cookie_file cfile;
#ifdef _IO_MTSAFE_IO
_IO_lock_t lock;
#endif
} *new_f;
switch (*mode++)
{
case 'r':
read_write = _IO_NO_WRITES;
break;
case 'w':
read_write = _IO_NO_READS;
break;
case 'a':
read_write = _IO_NO_READS|_IO_IS_APPENDING;
break;
default:
return NULL;
}
if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+'))
read_write &= _IO_IS_APPENDING;
new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
if (new_f == NULL)
return NULL;
#ifdef _IO_MTSAFE_IO
new_f->cfile.__file._lock = &new_f->lock;
#endif
_IO_cookie_init (&new_f->cfile, read_write, cookie, io_functions);
return &new_f->cfile.__file;
}
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