1首(shǒu )先标准只(zhī )是(shì )规定了这(zhè )些(xiē )函数的接口和具(jù )体的运行效率的要(yào )求,这(zhè )些函数具体是(shì )怎么写得要(yào )看各(gè )个(gè )编译(yì )器的实(shí )现(xiàn )和平台2例如使(shǐ )用(yòng )的编译(yì )器是(shì )visual studio,微(wēi )软(ruǎn )提供了(le )一部分(fèn )C运行时CRT的源码,里面会有(yǒu )memcpy,strcpy之(zhī )类(lèi )的
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