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/* ****************************************************************************
* stream/open/usb.c -- open a USB stream.
* Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
*
* This file is part of libcasio.
* libcasio 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 3.0 of the License,
* or (at your option) any later version.
*
* libcasio 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 libcasio; if not, see <http://www.gnu.org/licenses/>.
* ************************************************************************* */
#include "../stream.h"
#define NUM 5
/* Correspondance type. */
struct corresp {
int _valid;
casio_openusbstream_t *_openusb;
};
/* List of streams. */
CASIO_LOCAL struct corresp openusbs[NUM + 1] = {
#if !defined(LIBCASIO_DISABLED_LIBUSB)
{1, casio_openusb_libusb},
#endif
#if !defined(LIBCASIO_DISABLED_WINDOWS)
{1, casio_openusb_windows},
#endif
{0, NULL}
};
/**
* casio_add_default_usb_stream:
* Add a USB stream opener.
*
* @arg function the function pointer to add.
* @return the error code (0 if ok).
*/
int CASIO_EXPORT casio_add_default_usb_stream(casio_openusbstream_t *function)
{
struct corresp *c; int num;
for (c = openusbs, num = NUM; c->_valid && num; c++, num--);
if (!num)
return (casio_error_op);
c->_valid = 1;
c->_openusb = function;
return (0);
}
/**
* casio_open_usb_stream:
* Open the USB stream.
*
* @arg stream the stream to make.
* @return the error code (0 if ok).
*/
int CASIO_EXPORT casio_open_usb_stream(casio_stream_t **stream)
{
int err; struct corresp *c = openusbs;
if (!c->_valid)
return (casio_error_op);
for (; c->_valid; c++) {
err = (*c->_openusb)(stream);
if (!err)
return (0);
if (err != casio_error_nocalc)
return (err);
}
return (casio_error_nocalc);
}
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