/* $Id$ */ /* * 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; }