173 lines
4.5 KiB
C
173 lines
4.5 KiB
C
/* ****************************************************************************
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* stream/builtin/streams/open.c -- open a STREAMS stream.
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* Copyright (C) 2016-2017 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 "streams.h"
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#ifndef LIBCASIO_DISABLED_STREAMS
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/* Callbacks. */
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CASIO_LOCAL const casio_streamfuncs_t casio_streams_callbacks =
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casio_stream_callbacks_for_serial(casio_streams_close,
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casio_streams_setattrs, casio_streams_settm,
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casio_streams_read, casio_streams_write);
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/**
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* casio_opencom_streams:
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* Callback for `opencom`.
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*
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* @arg stream the stream to make.
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* @arg path the path.
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* @return the error (0 if ok).
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*/
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int CASIO_EXPORT casio_opencom_streams(casio_stream_t **stream,
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const char *path)
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{
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return (casio_open_stream_streams(stream, path,
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CASIO_OPENMODE_READ | CASIO_OPENMODE_WRITE));
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}
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/**
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* casio_open_stream_streams:
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* Initialize libcasio with char device.
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*
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* @arg stream the stream to make.
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* @arg path the path.
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* @arg mode the mode.
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* @return the error (0 if ok).
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*/
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int CASIO_EXPORT casio_open_stream_streams(casio_stream_t **stream,
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const char *path, casio_openmode_t mode)
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{
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int openfd, readfd, writefd, flags;
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/* Make up the flags. */
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flags = O_NOCTTY;
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if ((mode & CASIO_OPENMODE_READ) && (mode & CASIO_OPENMODE_WRITE))
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flags |= O_RDWR;
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else if (mode & CASIO_OPENMODE_READ)
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flags |= O_RDONLY;
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else if (mode & CASIO_OPENMODE_WRITE)
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flags |= O_WRONLY;
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else return (casio_error_invalid);
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/* Open the stream. */
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openfd = open(path, flags);
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if (openfd < 0) switch (errno) {
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case ENODEV: case ENOENT: case ENXIO:
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case EPIPE: case ESPIPE:
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/* No such device. */
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msg((ll_error, "couldn't open calculator: %s",
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strerror(errno)));
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return (casio_error_nocalc);
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case EACCES:
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/* No access. */
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msg((ll_error, "permission denied"));
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return (casio_error_noaccess);
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default:
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/* Default case. */
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msg((ll_error, "unknown error: %s (0x%X)",
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strerror(errno), errno));
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return (casio_error_unknown);
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}
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/* Make the file descriptors. */
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readfd = mode & CASIO_OPENMODE_READ ? openfd : -1;
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writefd = mode & CASIO_OPENMODE_WRITE ? openfd : -1;
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/* Make the final stream. */
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return (casio_open_stream_fd(stream, readfd, writefd, 1, 1));
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}
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/**
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* casio_open_stream_fd:
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* Initialize libcasio with file descriptors.
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*
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* @arg stream the stream to make.
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* @arg readfd the read file descriptor.
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* @arg writefd the write file descriptor.
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* @arg closeread close the read file descriptor?
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* @arg closewrite close the write file descriptor?
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* @return the error (0 if ok)
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*/
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int CASIO_EXPORT casio_open_stream_fd(casio_stream_t **stream,
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int readfd, int writefd, int closeread, int closewrite)
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{
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int err; streams_cookie_t *cookie = NULL;
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casio_openmode_t mode =
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CASIO_OPENMODE_READ | CASIO_OPENMODE_WRITE | CASIO_OPENMODE_SERIAL;
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/* Check if the devices are valid. */
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if ( readfd < 0 || read(readfd, NULL, 0) < 0)
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mode &= ~CASIO_OPENMODE_READ;
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if (writefd < 0 || write(writefd, NULL, 0) < 0)
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mode &= ~CASIO_OPENMODE_WRITE;
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/* Check if we have at least read/write file descriptors. */
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if (!mode) {
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err = casio_error_invalid;
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goto fail;
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}
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/* Allocate cookie. */
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cookie = casio_alloc(1, sizeof(streams_cookie_t));
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if (!cookie) {
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err = casio_error_alloc;
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goto fail;
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}
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cookie->_readfd = readfd;
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cookie->_writefd = writefd;
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cookie->_closeread = closeread;
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cookie->_closewrite = closewrite;
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cookie->_start = 0;
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cookie->_end = -1;
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/* Init for real. */
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msg((ll_info, "Initializing STREAMS stream with fds: (%d, %d)",
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readfd, writefd));
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/* Final call. */
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return (casio_open_stream(stream, mode, cookie,
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&casio_streams_callbacks, 0));
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fail:
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if (readfd >= 0 && closeread)
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close(readfd);
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if (writefd >= 0 && writefd != readfd && closewrite)
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close(writefd);
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return (err);
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}
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#endif
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