1首(shǒu )先标准只是规(guī )定(dìng )了这(zhè )些函(hán )数的接(jiē )口(kǒu )和具(jù )体的运(yùn )行(háng )效(xiào )率(lǜ )的要(yào )求,这些函数具(jù )体(tǐ )是怎么写得要(yào )看各个(gè )编译(yì )器的实现和平(píng )台(tái )2例如使用的编(biān )译(yì )器是visual studio,微软提(tí )供了一部(bù )分C运行时CRT的源码(mǎ ),里面会(huì )有memcpy,strcpy之(zhī )类的
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