1首(shǒu )先标准只(zhī )是(shì )规定了(le )这些(xiē )函数的接(jiē )口(kǒu )和具(jù )体(tǐ )的运行效(xiào )率的要求,这些函数(shù )具体是怎(zěn )么写得(dé )要(yào )看(kàn )各个编译(yì )器的(de )实(shí )现和平台2例如(rú )使用的编译(yì )器是(shì )visual studio,微软提(tí )供了一(yī )部(bù )分C运行(háng )时(shí )CRT的(de )源码,里面会有memcpy,strcpy之类的
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