The patch itself is in the same diff format that CVS uses.
修补程序本身采用的格式与 CVS 所使用的 diff 格式相同。
The code here USES a local variable diff, which is only defined within this block of code, while later in the constructor a separate variable, fill, is declared at the same level.
这里的代码使用了一个局部变量diff,这个局部变量只定义在这一块代码范围内,之后在构造函数中又声明了另一个相同级别的变量fill。
This works virtually the same as it does with CVS. Figure 7 shows the diff function at work.
这实际上与CVS中比较功能的工作方式完全相同。
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