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int* func_ret_null()

{

return xxx();

}

void func0(int* p)

{

p = func_ret_null();

assert(p);

*p = 42;

}

void func1(int* p)

{

p = func_ret_null();

if(p == NULL)

return;

*p = 42;

}

void func2(int* p)

{

p = func_ret_null();

if(p == NULL)

return;

*p = 42;

}

void func3(int* p)

{

p = func_ret_null();

if(p == NULL)

return;

*p = 42;

}

void func4(int* p)

{

p = func_ret_null();

if(p == NULL)

return;

*p = 42;

}

void func_error(int* p)

{

// 返回值没有判空就使用，但是其他调用func_ret_null函数的地方都判了空，推断此处可能需要判空

p = func_ret_null();

*p = 42;

}