1首先(xiān )标(biāo )准只是规(guī )定了(le )这些(xiē )函(hán )数的接口和具(jù )体的运行效率的要(yào )求(qiú ),这(zhè )些函数具体是怎么(me )写得要看各个编译(yì )器的(de )实现(xiàn )和平台(tái )2例如(rú )使(shǐ )用的编(biān )译(yì )器是visual studio,微(wēi )软(ruǎn )提供(gòng )了一(yī )部分C运(yùn )行时CRT的源码,里面会(huì )有memcpy,strcpy之类的
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