传统写法：
?
int get_order()
{
??? union endian
??? {
??????? short s;
??????? char c[2];
??? } order;
?
??? order.s = 0x1234;
?
??? if (order.c[0] == 0x12 && order.c[1] == 0x34)
??? {
??????? return 1; /* big endian */
??? }
??? else
??? {
??????? return 0; /* little endian */
??? }
}
简单写法：
?
int get_order()
{
??? short s = 1;
??? short *ps = &s
??? char *pc;
?
??? pc = (char *)ps;
?
??? if (*pc == 0)
??? {
??????? return 1; /* big endian */
??? }
??? else
??? {
??????? return 0; /* little endian */
??? }
参数写法：
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static int test_order(char *c)
{
??? *c = 1;
??? return 0;
}
?
int get_order()
{
??? int i = 0;
?
??? test_order(&i);
??? if (i == 0)
??? {
??????? return 1; /* big endian */
??? }
??? else
??? {
??????? return 0; /* little endian */
??? }
}
?
偷懒写法：
?
int get_order()
{
??? if (htons(1) == 1)
??? {
??????? return 1; /* big endian */
??? }
??? else
??? {
??????? return 0; /* little endian */
??? }
}
作者：aile770339804