127 lines
2.1 KiB
C
127 lines
2.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifndef UINT8
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#define UINT8 unsigned char
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#endif
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#ifndef UINT16
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#define UINT16 unsigned short
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#endif
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#ifndef UINT32
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#define UINT32 unsigned long
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#endif
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UINT8 g_pattern8[] = {0x01, 0x02, 0x03, 0x4, 0x05, 0x06, 0x07, 0x08};
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UINT16 g_pattern16[sizeof(g_pattern8)/2] = {0};
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UINT32 g_pattern32[sizeof(g_pattern8)/4] = {0};
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UINT8 _g_bytes[4] = {0x12, 0x34, 0x56, 0x78};
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UINT8 _g_bytes2[4] = {0};
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void MakePattern(void)
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{
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int i;
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UINT16 *pPat16 = (UINT16*)g_pattern8;
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UINT32 *pPat32 = (UINT32*)g_pattern8;
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for (i=0; i < sizeof(g_pattern16)/2; i++)
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{
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g_pattern16[i] = pPat16[i];
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}
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for (i=0; i < sizeof(g_pattern32)/4; i++)
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{
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g_pattern32[i] = pPat32[i];
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}
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}
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void PrintPattern(void)
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{
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int i;
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printf("Pattern 8bit:\n");
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for (i=0; i < sizeof(g_pattern8); i++)
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{
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printf("%02X ", g_pattern8[i]);
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}
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printf("\n");
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printf("Pattern 16bit:\n");
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for (i=0; i < sizeof(g_pattern16)/2; i++)
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{
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printf("%04X ", g_pattern16[i]);
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}
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printf("\n");
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printf("Pattern 32bit:\n");
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for (i=0; i < sizeof(g_pattern32)/4; i++)
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{
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printf("%08X ", g_pattern32[i]);
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}
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printf("\n");
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}
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int IsEndianBig(void)
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{
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int i, result;
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UINT8 *pBuf8;
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UINT16 *pBuf16;
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UINT32 *pBuf32;
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UINT16 halve;
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UINT32 word;
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halve = 0x1234;
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word = 0x12345678;
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result = -1;
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for (i=0; i < 4; i++)
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_g_bytes2[i] = _g_bytes[i];
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pBuf8 = (UINT8*)&word;
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if (((*pBuf8+0) == 0x12) && (*(pBuf8+1) == 0x34) && (*(pBuf8+2) == 0x56) && (*(pBuf8+3) == 0x78))
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{
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pBuf8 = (UINT8*)&halve;
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if (((*pBuf8+0) == 0x12) && (*(pBuf8+1) == 0x34))
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{
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result = 1;
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}
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}
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pBuf8 = (UINT8*)&word;
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if (((*pBuf8+0) == 0x78) && (*(pBuf8+1) == 0x56) && (*(pBuf8+2) == 0x34) && (*(pBuf8+3) == 0x12))
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{
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pBuf8 = (UINT8*)&halve;
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if (((*pBuf8+0) == 0x34) && (*(pBuf8+1) == 0x12))
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{
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result = 0;
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}
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}
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return result;
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}
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int main (void)
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{
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int eb;
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setbuf(stdout, NULL);
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if (IsEndianBig() == 1)
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printf("Endian is big\n");
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if (IsEndianBig() == 0)
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printf("Endian is little\n");
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MakePattern();
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PrintPattern();
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return 0;
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}
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