1首(shǒu )先标(biāo )准只是规定了这些函数(shù )的接口和具体(tǐ )的运行效率的(de )要(yào )求,这些函数具(jù )体是怎么写得(dé )要看各个编(biān )译器(qì )的实现(xiàn )和(hé )平台(tái )2例如(rú )使(shǐ )用(yòng )的编译(yì )器是visual studio,微软提供(gòng )了(le )一部(bù )分C运行(háng )时CRT的(de )源(yuán )码,里面会(huì )有memcpy,strcpy之(zhī )类的
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