100 lines
3.2 KiB
C
100 lines
3.2 KiB
C
/* ****************************************************************************
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* stream/open.c -- open a stream.
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* Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
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*
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* This file is part of libcasio.
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* libcasio is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 3.0 of the License,
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* or (at your option) any later version.
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*
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* libcasio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libcasio; if not, see <http://www.gnu.org/licenses/>.
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* ************************************************************************* */
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#include "stream.h"
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#define checknot(CASIO__COND, CASIO__ERR) \
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{ if (CASIO__COND) {err = CASIO__ERR; goto fail;}}
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/**
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* casio_open:
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* Open a libcasio stream.
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*
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* @arg pstream the stream to open.
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* @arg mode the open mode.
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* @arg type the stream type.
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* @arg cookie the stream cookie.
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* @arg callbacks the stream callbacks.
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* @return the error code (0 if ok).
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*/
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int CASIO_EXPORT casio_open(casio_stream_t **pstream, casio_openmode_t mode,
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casio_streamtype_t type, void *cookie,
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const casio_streamfuncs_t *callbacks)
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{
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int err; casio_stream_t *stream = NULL;
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casio_streamfuncs_t *c;
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/* allocate the stream */
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*pstream = casio_alloc(1, sizeof(casio_stream_t));
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stream = *pstream;
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checknot(stream == NULL, casio_error_alloc)
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/* initialize the stream callbacks */
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c = &stream->casio_stream_callbacks;
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memset(c, 0, sizeof(casio_streamfuncs_t));
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c->casio_streamfuncs_close = callbacks->casio_streamfuncs_close;
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c->casio_streamfuncs_settm = callbacks->casio_streamfuncs_settm;
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if (!type
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|| (type & (casio_streamtype_usb | casio_streamtype_serial)
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&& ~type & casio_streamtype_scsi)) {
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c->casio_streamfuncs_read = callbacks->casio_streamfuncs_read;
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c->casio_streamfuncs_write = callbacks->casio_streamfuncs_write;
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c->casio_streamfuncs_seek = callbacks->casio_streamfuncs_seek; }
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if (type & casio_streamtype_serial)
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c->casio_streamfuncs_setattrs = callbacks->casio_streamfuncs_setattrs;
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if (type & casio_streamtype_scsi)
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c->casio_streamfuncs_scsi = callbacks->casio_streamfuncs_scsi;
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/* initialize the stream properties */
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stream->casio_stream_type = type;
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stream->casio_stream_mode = mode;
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stream->casio_stream_cookie = cookie;
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stream->casio_stream_offset = 0;
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stream->casio_stream_lasterr = 0;
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casio_init_attrs(stream);
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casio_init_timeouts(stream);
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/* no error! */
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err = 0;
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fail:
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if (err) {
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casio_free(stream);
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(*callbacks->casio_streamfuncs_close)(cookie);
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}
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return (err);
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}
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/**
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* casio_close:
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* Close a libcasio stream.
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*
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* @arg stream the stream to close.
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* @return the error code (0 if ok).
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*/
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int CASIO_EXPORT casio_close(casio_stream_t *stream)
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{
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casio_stream_close_t *c;
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if (!stream) return (0);
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c = getcb(stream, close);
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if (c) (*c)(stream->casio_stream_cookie);
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casio_free(stream);
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return (0);
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}
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