1首(shǒu )先标准只(zhī )是规(guī )定了这些(xiē )函(hán )数的接口和具体(tǐ )的运行效率的要(yào )求(qiú ),这(zhè )些函(hán )数具体(tǐ )是怎(zěn )么(me )写(xiě )得要看各个(gè )编(biān )译(yì )器的实现(xiàn )和(hé )平台2例如使用的编(biān )译(yì )器是(shì )visual studio,微软提供了一部分C运(yùn )行时(shí )CRT的源码,里面会(huì )有memcpy,strcpy之(zhī )类的
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