79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
/* $Id$ */
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/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/**
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* @file endian_check.cpp
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* This pretty simple file checks if the system is LITTLE_ENDIAN or BIG_ENDIAN
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* it does that by putting a 1 and a 0 in an array, and read it out as one
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* number. If it is 1, it is LITTLE_ENDIAN, if it is 256, it is BIG_ENDIAN
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*
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* After that it outputs the contents of an include files (endian.h)
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* that says or TTD_LITTLE_ENDIAN, or TTD_BIG_ENDIAN. Makefile takes
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* care of the real writing to the file.
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*/
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#include <stdio.h>
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#include <string.h>
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/** Supported endian types */
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enum Endian {
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ENDIAN_LITTLE, ///< little endian
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ENDIAN_BIG ///< big endian
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};
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/**
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* Shortcut to printf("#define TTD_ENDIAN TTD_*_ENDIAN")
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* @param endian endian type to define
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*/
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static inline void printf_endian(Endian endian)
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{
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printf("#define TTD_ENDIAN %s\n", endian == ENDIAN_LITTLE ? "TTD_LITTLE_ENDIAN" : "TTD_BIG_ENDIAN");
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}
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/**
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* Main call of the endian_check program
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* @param argc argument count
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* @param argv arguments themselves
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* @return exit code
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*/
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int main (int argc, char *argv[])
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{
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unsigned char endian_test[2] = { 1, 0 };
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int force_BE = 0, force_LE = 0, force_PREPROCESSOR = 0;
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if (argc > 1 && strcmp(argv[1], "BE") == 0) force_BE = 1;
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if (argc > 1 && strcmp(argv[1], "LE") == 0) force_LE = 1;
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if (argc > 1 && strcmp(argv[1], "PREPROCESSOR") == 0) force_PREPROCESSOR = 1;
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printf("#ifndef ENDIAN_H\n#define ENDIAN_H\n");
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if (force_LE == 1) {
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printf_endian(ENDIAN_LITTLE);
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} else if (force_BE == 1) {
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printf_endian(ENDIAN_BIG);
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} else if (force_PREPROCESSOR == 1) {
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/* Support for universal binaries on OSX
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* Universal binaries supports both PPC and x86
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* If a compiler for OSX gets this setting, it will always pick the correct endian and no test is needed
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*/
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printf("#ifdef __BIG_ENDIAN__\n");
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printf_endian(ENDIAN_BIG);
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printf("#else\n");
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printf_endian(ENDIAN_LITTLE);
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printf("#endif\n");
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} else if (*(short*)endian_test == 1 ) {
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printf_endian(ENDIAN_LITTLE);
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} else {
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printf_endian(ENDIAN_BIG);
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}
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printf("#endif\n");
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return 0;
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}
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