author | peter1138 |
Sun, 03 Aug 2008 17:35:08 +0000 | |
changeset 9834 | 7474149531c1 |
parent 9551 | 6f60dca6c566 |
permissions | -rw-r--r-- |
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/* $Id$ */ |
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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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/** Supported endian types */ |
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enum Endian { |
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ENDIAN_LITTLE, ///< little endian |
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ENDIAN_BIG ///< big endian |
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}; |
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|
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/** |
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* Shortcut to printf("#define TTD_ENDIAN TTD_*_ENDIAN") |
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* @param endian endian type to define |
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*/ |
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static inline void printf_endian(Endian endian) |
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{ |
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printf("#define TTD_ENDIAN %s\n", endian == ENDIAN_LITTLE ? "TTD_LITTLE_ENDIAN" : "TTD_BIG_ENDIAN"); |
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} |
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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_endian(ENDIAN_LITTLE); |
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} else if (force_BE == 1) { |
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printf_endian(ENDIAN_BIG); |
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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_endian(ENDIAN_BIG); |
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printf("#else\n"); |
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printf_endian(ENDIAN_LITTLE); |
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printf("#endif\n"); |
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} else if (*(short*)endian_test == 1 ) { |
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printf_endian(ENDIAN_LITTLE); |
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} else { |
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printf_endian(ENDIAN_BIG); |
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} |
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printf("#endif\n"); |
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return 0; |
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} |