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Location: cpp/openttd-patchpack/source/src/endian_check.cpp - annotation
r11049:6eb2c87ed64a
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(svn r15389) -Feature: Add ability to select which base graphics set is used from the Game Options window. The change takes effect when the window is closed. This option can only be used from the intro menu, as reloading graphics during a game may cause issues.
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/** @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;
}
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