io.c
2.69 KB
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/* GNU mailutils - a suite of utilities for electronic mail
Copyright (C) 1999, 2000 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Library Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <io0.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
int
stream_create (stream_t *pstream, void *owner)
{
stream_t stream;
if (pstream == NULL || owner == NULL)
return EINVAL;
stream = calloc (1, sizeof (*stream));
if (stream == NULL)
return ENOMEM;
stream->owner = owner;
*pstream = stream;
return 0;
}
void
stream_destroy (stream_t *pstream, void *owner)
{
if (pstream && *pstream)
{
stream_t stream = *pstream;
if (stream->owner == owner)
free (stream);
*pstream = NULL;
}
}
int
stream_set_fd (stream_t stream, int (*_get_fd) (stream_t, int *), void *owner)
{
if (stream == NULL)
return EINVAL;
if (owner == stream->owner)
{
stream->_get_fd = _get_fd;
return 0;
}
return EACCES;
}
int
stream_set_read (stream_t stream, int (*_read)
(stream_t, char *, size_t, off_t, size_t *),
void *owner)
{
if (stream == NULL)
return EINVAL;
if (owner == stream->owner)
{
stream->_read = _read;
return 0;
}
return EACCES;
}
int
stream_set_write (stream_t stream, int (*_write)
__P ((stream_t, const char *, size_t, off_t, size_t *)),
void *owner)
{
if (stream == NULL)
return EINVAL;
if (stream->owner == owner)
{
stream->_write = _write;
return 0;
}
return EACCES;
}
int
stream_read (stream_t is, char *buf, size_t count,
off_t offset, size_t *pnread)
{
if (is == NULL || is->_read == NULL)
return EINVAL;
return is->_read (is, buf, count, offset, pnread);
}
int
stream_write (stream_t os, const char *buf, size_t count,
off_t offset, size_t *pnwrite)
{
if (os == NULL || os->_write == NULL)
return EINVAL;
return os->_write (os, buf, count, offset, pnwrite);
}
int
stream_get_fd (stream_t stream, int *pfd)
{
if (stream == NULL || stream->_get_fd == NULL)
return EINVAL;
return stream->_get_fd (stream, pfd);
}