1首先标准只是(shì )规定了这些函数的接(jiē )口(kǒu )和具(jù )体的运(yùn )行效(xiào )率的要求(qiú ),这些函数具(jù )体是怎(zěn )么(me )写得要(yào )看(kàn )各个编译(yì )器(qì )的实(shí )现和平(píng )台(tái )2例(lì )如使用的编译器是visual studio,微(wēi )软(ruǎn )提供了(le )一部(bù )分C运(yùn )行时CRT的源(yuán )码,里(lǐ )面会有memcpy,strcpy之类的
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