endian.c

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/*!
 * \file lib/gis/endian.c
 *
 * \brief GIS Library - Functions to determine architecture endian.
 *
 * This endian test was taken from ./src.contrib/GMSL/NVIZ2.2/TOGL/apps/image.c.
 *
 * SPDX-FileCopyrightText: 2001-2009 GRASS Development Team
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * \author Markus Neteler
 */
 
/*!
 * \brief Tests for little ENDIAN.
 *
 * Test if machine is little or big endian.
 *
 * \return 1 little endian
 * \return 0 big endian
 */
int G_is_little_endian(void)
{
    union {
        int testWord;
        char testByte[sizeof(int)];
    } endianTest;
 
    endianTest.testWord = 1;
 
    if (endianTest.testByte[0] == 1)
        return 1; /* true: little endian */
 
    return 0; /* false: big endian */
}