1首(shǒu )先标准只是规定了这些函数(shù )的接口(kǒu )和具体(tǐ )的运(yùn )行效率的要求(qiú ),这(zhè )些函(hán )数(shù )具体是怎(zěn )么写得要看各个编(biān )译器的(de )实现(xiàn )和(hé )平(píng )台2例如(rú )使(shǐ )用的编(biān )译器是(shì )visual studio,微软提(tí )供了一部(bù )分(fèn )C运(yùn )行时CRT的源码,里(lǐ )面(miàn )会有memcpy,strcpy之类的
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