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pointer and pointer variable 指针及指针变量
So, in this function, we are using the back chain pointer, the link register save area, and one local variable.
所以，在这个函数中，我们使用了回链指针、链接寄存器保存区和一个本地变量。
Listing 1. Get file row pointer and initialize return variable.
列表1 .获得文件行指针并初始化返回变量。
When strdup is called in foo , the namestr variable value is overwritten, thereby losing the pointer to the memory allocated in main , and that causes the leak.
当strdup在foo中被调用，这个namestr变量值就会被覆写，从而丢失main中内存分配的指针，导致渗漏。
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