未知長度的 strcat 函數(shù)怎樣設計速度才最快？

vity

涉及兩個問題： 1）字符串尋找結尾  2）數(shù)據(jù)拷貝

如果每一個字符串的結尾都有 15 個字節(jié)的 0，對于 64 位的操作系統(tǒng)，就可以 8 個字節(jié)跳著向后找，可以這樣設計嗎？

Hugo801122

沒研究過這么復雜的，都是拿來直接用。

stbk31796

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eagleatustb

我覺得你的方案有你的道理，但是需要一個結構去保存額外的15(或者其他數(shù)量)個空字符。還不如設計一個結構保存字符串的長度，cat的時候直接處理的是這個結構對象，直接定位串末。另外，對于快速拷貝，我看過比較快的實現(xiàn)是先計算串長，然后以對齊到計算機字長的大小做一次拷貝，最后多出的幾個字符逐個拷貝。回復 1# vity