mirror of https://github.com/OpenTTD/OpenTTD.git
55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
/* $Id$ */
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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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#include <stdio.h>
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#include <string.h>
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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("#define TTD_LITTLE_ENDIAN\n");
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} else if (force_BE == 1) {
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printf("#define TTD_BIG_ENDIAN\n");
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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("#define TTD_BIG_ENDIAN\n");
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printf("#else\n");
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printf("#define TTD_LITTLE_ENDIAN\n");
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printf("#endif\n");
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} else if (*(short*)endian_test == 1 ) {
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printf("#define TTD_LITTLE_ENDIAN\n");
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} else {
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printf("#define TTD_BIG_ENDIAN\n");
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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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