Physically, see, this guy on the left is the total amount of stuff that goes out of the region per unit time.
看这儿,左边的这个是单位时间内,从区域里出来的流量。
Both strncpy (3) and strncat (3) require that you give the amount of space left, not the total size of the buffer.
strncpy(3)和strncat(3)都要求您给出剩余的空间,而不是给出缓冲区的总大小。
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