1首(shǒu )先(xiān )标准只是规定了(le )这些函数(shù )的接(jiē )口和具(jù )体(tǐ )的运(yùn )行效率(lǜ )的(de )要求,这(zhè )些(xiē )函数(shù )具(jù )体是怎么(me )写得要看各个编译器的实(shí )现和(hé )平台(tái )2例(lì )如(rú )使(shǐ )用的编译(yì )器(qì )是(shì )visual studio,微软(ruǎn )提供了(le )一部分C运行时CRT的源码,里面会有memcpy,strcpy之(zhī )类的
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