io.c
2.46 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
istream_init (istream_t *pis, int (*_read)
__P ((istream_t, char *, size_t, off_t, ssize_t *)),
void *owner)
{
istream_t is;
if (pis == NULL)
return EINVAL;
is = calloc (1, sizeof (*is));
if (is == NULL)
return ENOMEM;
is->owner = owner;
is->_read = _read;
*pis = is;
return 0;
}
int
ostream_init (ostream_t *pos, int (*_write)
__P ((ostream_t, const char *, size_t, off_t, ssize_t *)),
void *owner)
{
ostream_t os;
if (pos == NULL)
return EINVAL;
os = calloc (1, sizeof (*os));
if (os == NULL)
return ENOMEM;
os->owner = owner;
os->_write = _write;
*pos = os;
return 0;
}
void
istream_destroy (istream_t *pis, void *owner)
{
if (pis && *pis)
{
istream_t is = *pis;
is->ref_count--;
if ((is->owner && is->owner == owner) ||
(is->owner == NULL && is->ref_count <= 0))
free (is);
*pis = NULL;
}
}
void
ostream_destroy (ostream_t *pos, void *owner)
{
if (pos && (*pos))
{
ostream_t os = *pos;
os->ref_count--;
if ((os->owner && os->owner == owner) ||
(os->owner == NULL && os->ref_count <= 0))
free (os);
*pos = NULL;
}
}
int
istream_read (istream_t is, char *buf, size_t count,
off_t offset, ssize_t *pnread)
{
if (is == NULL || is->_read == NULL)
return EINVAL;
return is->_read (is, buf, count, offset, pnread);
}
int
ostream_write (ostream_t os, const char *buf, size_t count,
off_t offset, ssize_t *pnwrite)
{
if (os == NULL || os->_write == NULL)
return EINVAL;
return os->_write (os, buf, count, offset, pnwrite);
}