1首先(xiān )标准只是规定了这些函数的接口和(hé )具体的运(yùn )行效(xiào )率(lǜ )的要(yào )求(qiú ),这(zhè )些(xiē )函数具(jù )体(tǐ )是(shì )怎么写(xiě )得(dé )要看各个(gè )编(biān )译器的实现和平(píng )台2例如使(shǐ )用的编译器是visual studio,微软提供(gòng )了一(yī )部分C运(yùn )行(háng )时CRT的(de )源(yuán )码,里面会(huì )有memcpy,strcpy之类的
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