61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/* ****************************************************************************
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* stream/builtin/streams/write.c -- write to 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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/**
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* casio_streams_write:
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* Write to a terminal.
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*
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* @arg cookie the cookie.
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* @arg data the source.
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* @arg size the source size.
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* @return the size written if > 0, or if < 0 the error code is -[returned value].
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*/
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ssize_t CASIO_EXPORT casio_streams_write(streams_cookie_t *cookie,
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const unsigned char *data, size_t size)
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{
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int fd = cookie->_writefd;
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size_t writtensize = 0;
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/* Send. */
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while (size) {
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ssize_t wr = write(fd, data, size);
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if (wr < 0) break;
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size -= (size_t)wr;
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writtensize += (size_t)wr;
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}
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/* Be sure it's written, or check the error. */
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if (size) switch (errno) {
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case ENODEV:
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return -(casio_error_nocalc);
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default:
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msg((ll_fatal, "errno was %d: %s", errno, strerror(errno)));
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return -(casio_error_unknown);
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}
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return (writtensize);
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}
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#endif
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