53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
/* ****************************************************************************
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* stream/read.c -- read from 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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/**
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* casio_read:
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* Read from a libcasio stream.
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*
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* @arg stream the stream to read from.
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* @arg dest the destination buffer.
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* @arg size the amount of bytes to read.
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* @return the error code (0 if ok).
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*/
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int CASIO_EXPORT casio_read(casio_stream_t *stream, void *dest, size_t size)
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{
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int err;
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/* check if we can read */
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failure(~stream->casio_stream_mode & CASIO_OPENMODE_READ, casio_error_read)
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/* read */
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if (!size) return (0);
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err = (*getcb(stream, read))(stream->casio_stream_cookie, dest, size);
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if (err) {
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msg((ll_error, "Stream reading failure: %s", casio_strerror(err)));
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goto fail;
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}
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/* move the cursor and return */
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stream->casio_stream_offset += size;
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err = 0;
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fail:
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stream->casio_stream_lasterr = err;
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return (err);
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}
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