diff options
Diffstat (limited to 'src/endian_check.c')
| -rw-r--r-- | src/endian_check.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/src/endian_check.c b/src/endian_check.c new file mode 100644 index 000000000..a302ea40b --- /dev/null +++ b/src/endian_check.c @@ -0,0 +1,52 @@ +/* $Id$ */ + +#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; +} |