未知长度的 strcat 函数怎样设计速度才最快？

vity

涉及两个问题： 1）字符串寻找结尾  2）数据拷贝

如果每一个字符串的结尾都有 15 个字节的 0，对于 64 位的操作系统，就可以 8 个字节跳着向后找，可以这样设计吗？

Hugo801122

没研究过这么复杂的，都是拿来直接用。

stbk31796

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eagleatustb

我觉得你的方案有你的道理，但是需要一个结构去保存额外的15(或者其他数量)个空字符。还不如设计一个结构保存字符串的长度，cat的时候直接处理的是这个结构对象，直接定位串末。另外，对于快速拷贝，我看过比较快的实现是先计算串长，然后以对齐到计算机字长的大小做一次拷贝，最后多出的几个字符逐个拷贝。回复 1# vity