一个assert的写法

char assert_buf[512];
int assert_buf_len;

#ifdef XXX_DEBUG
#define assert(expr, ...) 
do{    
    if ((!(expr))) 
    {
        char *str = __FILE__; 
        int i; 
        for(i=strlen(str);i>=0;i--) if(str[i]=='\'||str[i]=='/') break; 
        printf("ASSERTION FAILED (%s) at: %s:%d:: ", #expr, str+i+1, __LINE__);
        assert_buf_len = snprintf(assert_buf, sizeof(assert_buf)-1, __VA_ARGS__);
        printf("%s
", assert_buf);
    }
} while (0)
#else
#define assert(expr, ...) do{ 
}while(0)
#endif