GNU C ANSI C һЩÇø±ð

1 ¿É±äÊý¾Ý½á¹¹
struct var_data
{
    int len;
    char data[0];
};
±éÀúlenºóÊý¾Ý
for(i = 0; i < s.len; i++)
{
   printf("%02x",s.data[i]);
}
2 case ·¶Î§Çø¼ä ¡¾x£¬y¡¿
3 Óï¾ä±í´ï
#define min_t (type, x, y) \
({  type __x = (x); type __y = (y); __x < __y ? __x: __y;})
int ia, ib, mini;
float fa, fb, minf;
mini = min_t ( int, ia, ib);
minf = min_f (float, fa, fb);
±ê×¼c£º
#define min (x, y) ((x) < (y) ? (x) : (y))
´úÂëmin ( ++ia, ++ib£© ±»Õ¹¿ªÎª £¨£¨++ia) < (++ib) ? (++ia):(++ib)) ia£¬ib ±»¼ÓÁËÁ½´Î¡£
4 typeof
#define min(x, y) ( {\
const typeof(x) __x = £¨x£©; \
const typeof(y) __y = £¨y£©;\
(void) (&__x ==&__y); \
__x <_ _y ? __x : __y ;})
5 pr_debug ¿É·ÀÖ¹ÔÚ²ÎÊýÑ¡Ïî²»´ú±íÈκβÎÊýµÄʱºò ²»Êä³ö£¬¡£
6 ¿ÉÖ¸¶¨·¶Î§³õʼ»¯Êý×é unsigned char data [MAX] = { [0 ... MAX - 2] = 0};
½á¹¹Ìå³ÉÔ±³õʼ»¯½á¹¹Ì壺
struct file_operations ext2_file_operations =
{
llseek:generic_file_llseek,
read: generic_file_read,
}
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struct file_operations ext2_file_opreations =
{
.llseek       = generic_file_llseek,
.read         = generic_file_read,
}
.....