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annotate src/endian_check.cpp @ 7272:dc7fb38ec443 draft

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(svn r10601) -Codechange: store (and use) the type of stations instead of hardcoding station types by graphics IDs.
author rubidium <rubidium@openttd.org>
date Mon, 16 Jul 2007 23:55:22 +0000
parents fc703c6dc92c
children 66202e2e042a
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1 /* $Id$ */
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2
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3 /** @file endian_check.cpp
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4 * This pretty simple file checks if the system is LITTLE_ENDIAN or BIG_ENDIAN
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5 * it does that by putting a 1 and a 0 in an array, and read it out as one
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6 * number. If it is 1, it is LITTLE_ENDIAN, if it is 256, it is BIG_ENDIAN
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7 *
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8 * After that it outputs the contents of an include files (endian.h)
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9 * that says or TTD_LITTLE_ENDIAN, or TTD_BIG_ENDIAN. Makefile takes
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10 * care of the real writing to the file. */
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11
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12 #include <stdio.h>
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13 #include <string.h>
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14
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15 /** Main call of the endian_check program
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16 * @param argc argument count
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17 * @param argv arguments themselves
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18 * @return exit code */
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19 int main (int argc, char *argv[]) {
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20 unsigned char EndianTest[2] = { 1, 0 };
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21 int force_BE = 0, force_LE = 0, force_PREPROCESSOR = 0;
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23 if (argc > 1 && strcmp(argv[1], "BE") == 0)
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24 force_BE = 1;
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25 if (argc > 1 && strcmp(argv[1], "LE") == 0)
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26 force_LE = 1;
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27 if (argc > 1 && strcmp(argv[1], "PREPROCESSOR") == 0)
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28 force_PREPROCESSOR = 1;
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29
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30 printf("#ifndef ENDIAN_H\n#define ENDIAN_H\n");
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31
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32 if (force_LE == 1) {
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33 printf("#define TTD_LITTLE_ENDIAN\n");
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34 } else {
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35 if (force_BE == 1) {
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36 printf("#define TTD_BIG_ENDIAN\n");
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37 } else {
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38 if (force_PREPROCESSOR == 1) {
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39 /** adding support for universal binaries on OSX
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40 * Universal binaries supports both PPC and x86
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41 * If a compiler for OSX gets this setting, it will always pick the correct endian and no test is needed */
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42 printf("#ifdef __BIG_ENDIAN__\n");
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43 printf("#define TTD_BIG_ENDIAN\n");
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44 printf("#else\n");
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45 printf("#define TTD_LITTLE_ENDIAN\n");
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46 printf("#endif\n");
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47 } else {
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48 if ( *(short *) EndianTest == 1 )
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49 printf("#define TTD_LITTLE_ENDIAN\n");
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50 else
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51 printf("#define TTD_BIG_ENDIAN\n");
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52 }
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53 }
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54 }
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55 printf("#endif\n");
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56
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57 return 0;
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58 }