1首(shǒu )先标(biāo )准只是规定了这些函数(shù )的(de )接口和具体的运行(háng )效(xiào )率(lǜ )的要(yào )求,这些(xiē )函数(shù )具(jù )体是(shì )怎么(me )写(xiě )得要看各(gè )个编译器的实(shí )现和平(píng )台2例如使(shǐ )用的编(biān )译(yì )器(qì )是visual studio,微软提供(gòng )了一部(bù )分C运行时CRT的源码,里面会(huì )有memcpy,strcpy之类的
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