1首(shǒu )先标准只是(shì )规(guī )定了这些(xiē )函(hán )数(shù )的接口(kǒu )和(hé )具体的运行效(xiào )率(lǜ )的要求,这(zhè )些函数具体是(shì )怎么(me )写(xiě )得要(yào )看各(gè )个(gè )编译器的实(shí )现和平台2例如使(shǐ )用的编(biān )译器是visual studio,微(wēi )软提(tí )供了一部(bù )分C运(yùn )行时CRT的(de )源码,里面会(huì )有memcpy,strcpy之(zhī )类的
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