GRASS GIS 8 Programmer's Manual  8.5.0dev(2025)-565e82de51
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endian.c
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1 /*!
2  * \file lib/gis/endian.c
3  *
4  * \brief GIS Library - Functions to determine architecture endian.
5  *
6  * This endian test was taken from ./src.contrib/GMSL/NVIZ2.2/TOGL/apps/image.c.
7  *
8  * (C) 2001-2009 by the GRASS Development Team
9  *
10  * This program is free software under the GNU General Public License
11  * (>=v2). Read the file COPYING that comes with GRASS for details.
12  *
13  * \author Markus Neteler
14  */
15 
16 /*!
17  * \brief Tests for little ENDIAN.
18  *
19  * Test if machine is little or big endian.
20  *
21  * \return 1 little endian
22  * \return 0 big endian
23  */
24 int G_is_little_endian(void)
25 {
26  union {
27  int testWord;
28  char testByte[sizeof(int)];
29  } endianTest;
30 
31  endianTest.testWord = 1;
32 
33  if (endianTest.testByte[0] == 1)
34  return 1; /* true: little endian */
35 
36  return 0; /* false: big endian */
37 }
G_is_little_endian
int G_is_little_endian(void)
Tests for little ENDIAN.
Definition: endian.c:24