1首先(xiān )标准只是规定(dìng )了(le )这些函数的接口和(hé )具体的运(yùn )行效率的要求,这些(xiē )函(hán )数具(jù )体(tǐ )是怎么写得要看(kàn )各个编(biān )译(yì )器(qì )的实现和(hé )平台2例如(rú )使用(yòng )的编(biān )译器(qì )是visual studio,微软提(tí )供(gòng )了一部分(fèn )C运行时CRT的源(yuán )码,里面会(huì )有(yǒu )memcpy,strcpy之(zhī )类的
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