cpp/openttd-patchpack/source Files · endian_check.c

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Location: cpp/openttd-patchpack/source/endian_check.c

r3303:1bae0f5399a4 1.6 KiB text/x-c Show Annotation Show as Raw Download as Raw

bjarni

(svn r4060) -Codechange: [OSX] made the release target (in os/macosx/Makefile) easier to use since it gives the release disk image the right name automatically
it now uses REV instead of RELEASE, which means RELEASE is not needed to be set manaully anymore
it also automatically adds "-jaguar" when making a build aimed at OSX 10.2 (codenamed jaguar)

/* $Id$ */

#include <stdio.h>

// This pretty simple file checks if the system is LITTLE_ENDIAN or BIG_ENDIAN
//  it does that by putting a 1 and a 0 in an array, and read it out as one
//  number. If it is 1, it is LITTLE_ENDIAN, if it is 256, it is BIG_ENDIAN
//
// After that it outputs the contents of an include files (endian.h)
//  that says or TTD_LITTLE_ENDIAN, or TTD_BIG_ENDIAN. Makefile takes
//  care of the real writing to the file.

int main (int argc, char *argv[]) {
	unsigned char EndianTest[2] = { 1, 0 };
	int force_BE = 0, force_LE = 0, force_PREPROCESSOR = 0;

	if (argc > 1 && strcmp(argv[1], "BE") == 0)
		force_BE = 1;
	if (argc > 1 && strcmp(argv[1], "LE") == 0)
		force_LE = 1;
	if (argc > 1 && strcmp(argv[1], "PREPROCESSOR") == 0)
		force_PREPROCESSOR = 1;

	printf("#ifndef ENDIAN_H\n#define ENDIAN_H\n");

	if (force_LE == 1) {
		printf("#define TTD_LITTLE_ENDIAN\n");
	} else {
		if (force_BE == 1) {
			printf("#define TTD_BIG_ENDIAN\n");
		} else {
			if (force_PREPROCESSOR == 1) {
				// adding support for universal binaries on OSX
				// Universal binaries supports both PPC and x86
				// If a compiler for OSX gets this setting, it will always pick the correct endian and no test is needed
				printf("#ifdef __BIG_ENDIAN__\n");
				printf("#define TTD_BIG_ENDIAN\n");
				printf("#else\n");
				printf("#define TTD_LITTLE_ENDIAN\n");
				printf("#endif\n");
			} else {
				if ( *(short *) EndianTest == 1 )
					printf("#define TTD_LITTLE_ENDIAN\n");
				else
					printf("#define TTD_BIG_ENDIAN\n");
			}
		}
	}
	printf("#endif\n");

	return 0;
}