1首先标准只是(shì )规(guī )定了(le )这(zhè )些(xiē )函(hán )数(shù )的接口和(hé )具体的运行效率(lǜ )的要(yào )求,这(zhè )些函数(shù )具(jù )体(tǐ )是怎么(me )写(xiě )得要看各(gè )个编译(yì )器的实(shí )现和平台(tái )2例(lì )如使用的编(biān )译器是visual studio,微软(ruǎn )提供(gòng )了一部分C运(yùn )行时CRT的源码,里面会有memcpy,strcpy之类的
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