1首(shǒu )先标(biāo )准只(zhī )是(shì )规定了这些(xiē )函数的接口(kǒu )和具体的运行效率(lǜ )的要(yào )求,这(zhè )些函数(shù )具(jù )体是怎么(me )写得要看各(gè )个(gè )编译(yì )器的实现(xiàn )和(hé )平(píng )台2例如使(shǐ )用(yòng )的编(biān )译器(qì )是visual studio,微软提供了一部分C运行时CRT的源码,里面(miàn )会有memcpy,strcpy之类的(de )
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