/* $Id$ */ #include <stdio.h> // 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. int main (int argc, char *argv[]) { unsigned char EndianTest[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("#define TTD_LITTLE_ENDIAN\n"); } else { if (force_BE == 1) { printf("#define TTD_BIG_ENDIAN\n"); } else { if (force_PREPROCESSOR == 1) { // adding 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("#define TTD_BIG_ENDIAN\n"); printf("#else\n"); printf("#define TTD_LITTLE_ENDIAN\n"); printf("#endif\n"); } else { if ( *(short *) EndianTest == 1 ) printf("#define TTD_LITTLE_ENDIAN\n"); else printf("#define TTD_BIG_ENDIAN\n"); } } } printf("#endif\n"); return 0; }