1首(shǒu )先标准只(zhī )是规定了这些函数的接(jiē )口和具体(tǐ )的运行效(xiào )率(lǜ )的要(yào )求,这些(xiē )函数(shù )具体(tǐ )是怎(zěn )么(me )写得要看各个编(biān )译(yì )器的实现和(hé )平(píng )台2例(lì )如(rú )使(shǐ )用(yòng )的编译器是visual studio,微软(ruǎn )提供了一(yī )部分C运(yùn )行(háng )时CRT的源(yuán )码,里面会有memcpy,strcpy之(zhī )类的
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