44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/* Determine the "endianess" of the CPU.
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Copyright (C) 1991 Free Software Foundation, Inc.
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Contributed by Torbjorn Granlund (tege@sics.se).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C 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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <stdio.h>
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main()
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{
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unsigned long int i;
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puts("#ifndef\t_ENDIAN_H\n#define\t_ENDIAN_H\t1");
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if (sizeof(i) != 4)
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puts("#error \"Not a 32-bit machine!\"");
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i = (((((('A' << 8) + 'B') << 8) + 'C') << 8) + 'D');
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if (!strncmp ("ABCD", (char *) &i, 4))
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puts ("#define __BIG_ENDIAN");
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else if (!strncmp ("DCBA", (char *) &i, 4))
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puts ("#define __LITTLE_ENDIAN");
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else
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puts ("#define __MIXED_ENDIAN");
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puts("#endif\t/* endian.h */");
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exit (0);
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}
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