1首(shǒu )先标准(zhǔn )只是规定了这(zhè )些函数的接口和(hé )具体的运(yùn )行效(xiào )率的要求,这些(xiē )函数(shù )具体是(shì )怎么(me )写得要看各(gè )个编译(yì )器的实(shí )现(xiàn )和(hé )平台2例如使用(yòng )的编(biān )译(yì )器(qì )是visual studio,微(wēi )软提(tí )供了一部分C运行时(shí )CRT的源码,里面(miàn )会有memcpy,strcpy之(zhī )类的
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