1首(shǒu )先(xiān )标准只是规定了这(zhè )些函数的接口和具(jù )体的运行效(xiào )率的要求,这些(xiē )函(hán )数(shù )具(jù )体(tǐ )是怎(zěn )么写得要看各个编译器的实(shí )现(xiàn )和平台2例如使(shǐ )用的编译器(qì )是visual studio,微(wēi )软提(tí )供(gòng )了一部(bù )分C运行(háng )时(shí )CRT的(de )源(yuán )码,里(lǐ )面(miàn )会有memcpy,strcpy之类的
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