1首(shǒu )先标准只是规定了(le )这(zhè )些函数的接口和具(jù )体的运行效率的(de )要(yào )求(qiú ),这些函数具体是怎(zěn )么写得要看(kàn )各个(gè )编译(yì )器的(de )实现(xiàn )和平(píng )台2例如使(shǐ )用(yòng )的编译(yì )器是(shì )visual studio,微软(ruǎn )提供了(le )一(yī )部(bù )分C运行时(shí )CRT的源(yuán )码,里面会有(yǒu )memcpy,strcpy之类的
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