57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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. See the GNU
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* 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
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* misc.c
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* Misc code for libartnet (almost nothing these days)
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* Copyright (C) 2004-2005 Simon Newton
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*/
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#include <stdarg.h>
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#include <stdio.h>
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#include "private.h"
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// static buffer for the error strings
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char artnet_errstr[256];
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/*
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* Libartnet error function
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* This writes the error string to artnet_errstr, which can be accessed
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* using artnet_strerror();
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*/
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void artnet_error(const char *fmt, ...) {
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va_list ap;
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va_start(ap, fmt);
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vsnprintf(artnet_errstr, sizeof(artnet_errstr), fmt, ap);
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va_end(ap);
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}
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/*
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* Converts 4 bytes in big endian order to a 32 bit int
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*/
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int32_t artnet_misc_nbytes_to_32(uint8_t bytes[4]) {
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return (bytes[0] << 24) | (bytes[1] << 16) | (bytes[2] << 8) | bytes[3];
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}
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/*
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* Converts an int to an arrany of 4 bytes in big endian format
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*/
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void artnet_misc_int_to_bytes(int data, uint8_t *bytes) {
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bytes[3] = (data & 0x000000FF);
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bytes[2] = (data & 0x0000FF00) >> 8;
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bytes[1] = (data & 0x00FF0000) >> 16;
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bytes[0] = (data & 0xFF000000) >> 24;
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}
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