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79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/*
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* endian - Determine the byte order of a long on your machine.
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*
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* Big Endian: Amdahl, 68k, Pyramid, Mips, Sparc, ...
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* Little Endian: Vax, 32k, Spim (Dec Mips), i386, i486, ...
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*/
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/*
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* Copyright (c) 1993 by Landon Curt Noll. All Rights Reserved.
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright, this permission notice and text
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* this comment, and the disclaimer below appear in all of the following:
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*
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* supporting documentation
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* source copies
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* source works derived from this source
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* binaries derived from this source or from derived source
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*
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* LANDON CURT NOLL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
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* EVENT SHALL LANDON CURT NOLL BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
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* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*
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* chongo was here /\../\
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*/
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#include <stdio.h>
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#include "have_unistd.h"
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#if defined(HAVE_UNISTD_H)
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#include <unistd.h>
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#endif
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/* byte order array */
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char byte[8] = { (char)0x12, (char)0x36, (char)0x48, (char)0x59,
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(char)0x01, (char)0x23, (char)0x45, (char)0x67 };
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MAIN
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main(void)
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{
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/* pointers into the byte order array */
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int *intp = (int *)byte;
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#if defined(DEBUG)
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short *shortp = (short *)byte;
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long *longp = (long *)byte;
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printf("byte: %02x %02x %02x %02x %02x %02x %02x %02x\n",
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byte[0], byte[1], byte[2], byte[3],
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byte[4], byte[5], byte[6], byte[7]);
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printf("short: %04x %04x %04x %04x\n",
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shortp[0], shortp[1], shortp[2], shortp[3]);
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printf("int: %08x %08x\n",
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intp[0], intp[1]);
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printf("long: %08x %08x\n",
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longp[0], longp[1]);
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#endif
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/* Print the standard <machine/endian.h> defines */
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printf("#define BIG_ENDIAN\t4321\n");
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printf("#define LITTLE_ENDIAN\t1234\n");
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/* Determine byte order */
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if (intp[0] == 0x12364859) {
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/* Most Significant Byte first */
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printf("#define BYTE_ORDER\tBIG_ENDIAN\n");
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} else if (intp[0] == 0x59483612) {
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/* Least Significant Byte first */
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printf("#define BYTE_ORDER\tLITTLE_ENDIAN\n");
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} else {
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fprintf(stderr, "Unknown int Byte Order, set BYTE_ORDER in Makefile\n");
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exit(1);
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}
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exit(0);
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}
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