1首先(xiān )标(biāo )准只是规(guī )定了(le )这些函(hán )数(shù )的接口和具体的运行(háng )效(xiào )率(lǜ )的要求,这些函数具体是怎(zěn )么(me )写得要(yào )看各个(gè )编译器的实(shí )现(xiàn )和平台(tái )2例(lì )如使(shǐ )用的编译器(qì )是visual studio,微软提(tí )供了一(yī )部分C运行时(shí )CRT的源码,里面(miàn )会(huì )有memcpy,strcpy之(zhī )类的
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