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

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rubidium

(svn r20593) -Fix: (rlongago, r20547): long ago the service interval was int16, after which is got converted to Date except in the order backup. Much later I copied the savegame snippets from a vehicle and applied that on the order backup. Presto, reading/writing 32 bits (of Date) into 16 bits of ancient style service interval. That would then "spoil" the name pointer and that eventually crashes OpenTTD as it's likely to be an invalid pointer.

/* $Id$ */

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * @file endian_check.cpp
 * 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.
 */

#include <stdio.h>
#include <string.h>

/** Supported endian types */
enum Endian {
	ENDIAN_LITTLE, ///< little endian
	ENDIAN_BIG     ///< big endian
};

/**
 * Shortcut to printf("#define TTD_ENDIAN TTD_*_ENDIAN")
 * @param endian endian type to define
 */
static inline void printf_endian(Endian endian)
{
	printf("#define TTD_ENDIAN %s\n", endian == ENDIAN_LITTLE ? "TTD_LITTLE_ENDIAN" : "TTD_BIG_ENDIAN");
}

/**
 * Main call of the endian_check program
 * @param argc argument count
 * @param argv arguments themselves
 * @return exit code
 */
int main (int argc, char *argv[])
{
	unsigned char endian_test[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_endian(ENDIAN_LITTLE);
	} else if (force_BE == 1) {
		printf_endian(ENDIAN_BIG);
	} else if (force_PREPROCESSOR == 1) {
		/* 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_endian(ENDIAN_BIG);
		printf("#else\n");
		printf_endian(ENDIAN_LITTLE);
		printf("#endif\n");
	} else if (*(short*)endian_test == 1 ) {
		printf_endian(ENDIAN_LITTLE);
	} else {
		printf_endian(ENDIAN_BIG);
	}
	printf("#endif\n");

	return 0;
}