countof

c语言中没有这样的函数wget中定义如下（wget.h），其实就是一个宏定义：

 

/* The number of elements in an array. For example: static char a[] = "foo"; -- countof(a) == 4 (note terminating /0) int a[5] = {1, 2}; -- countof(a) == 5 char *a[] = { -- countof(a) == 3 "foo", "bar", "baz" }; */ #define countof(array) (sizeof (array) / sizeof ((array)[0]))