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annotate src/endian_check.cpp @ 5584:4b26bd55bd24 draft

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(svn r8033) [cpp] - Prepare for merge from branches/cpp (all .c files renamed to .cpp)
author KUDr <KUDr@openttd.org>
date Wed, 10 Jan 2007 18:12:09 +0000
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children c44c070c5032
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5584
4b26bd55bd24 (svn r8033) [cpp] - Prepare for merge from branches/cpp (all .c files renamed to .cpp)
KUDr <KUDr@openttd.org>
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1 /* $Id$ */
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2
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3 #include <stdio.h>
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4
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5 // This pretty simple file checks if the system is LITTLE_ENDIAN or BIG_ENDIAN
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6 // it does that by putting a 1 and a 0 in an array, and read it out as one
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7 // number. If it is 1, it is LITTLE_ENDIAN, if it is 256, it is BIG_ENDIAN
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8 //
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9 // After that it outputs the contents of an include files (endian.h)
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10 // that says or TTD_LITTLE_ENDIAN, or TTD_BIG_ENDIAN. Makefile takes
4b26bd55bd24 (svn r8033) [cpp] - Prepare for merge from branches/cpp (all .c files renamed to .cpp)
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11 // care of the real writing to the file.
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12
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13 int main (int argc, char *argv[]) {
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14 unsigned char EndianTest[2] = { 1, 0 };
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15 int force_BE = 0, force_LE = 0, force_PREPROCESSOR = 0;
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16
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17 if (argc > 1 && strcmp(argv[1], "BE") == 0)
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18 force_BE = 1;
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19 if (argc > 1 && strcmp(argv[1], "LE") == 0)
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20 force_LE = 1;
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21 if (argc > 1 && strcmp(argv[1], "PREPROCESSOR") == 0)
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22 force_PREPROCESSOR = 1;
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23
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24 printf("#ifndef ENDIAN_H\n#define ENDIAN_H\n");
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25
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26 if (force_LE == 1) {
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27 printf("#define TTD_LITTLE_ENDIAN\n");
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28 } else {
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29 if (force_BE == 1) {
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30 printf("#define TTD_BIG_ENDIAN\n");
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31 } else {
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32 if (force_PREPROCESSOR == 1) {
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33 // adding support for universal binaries on OSX
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34 // Universal binaries supports both PPC and x86
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35 // If a compiler for OSX gets this setting, it will always pick the correct endian and no test is needed
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36 printf("#ifdef __BIG_ENDIAN__\n");
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37 printf("#define TTD_BIG_ENDIAN\n");
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38 printf("#else\n");
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39 printf("#define TTD_LITTLE_ENDIAN\n");
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40 printf("#endif\n");
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41 } else {
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42 if ( *(short *) EndianTest == 1 )
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43 printf("#define TTD_LITTLE_ENDIAN\n");
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44 else
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45 printf("#define TTD_BIG_ENDIAN\n");
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46 }
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47 }
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48 }
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49 printf("#endif\n");
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50
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51 return 0;
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52 }