1首先标准(zhǔn )只(zhī )是规(guī )定了(le )这(zhè )些函数(shù )的接(jiē )口(kǒu )和(hé )具体(tǐ )的运行效(xiào )率的(de )要求,这(zhè )些函数(shù )具体(tǐ )是怎么写(xiě )得(dé )要看各个编译器的实现和(hé )平(píng )台2例(lì )如(rú )使(shǐ )用的编译器是visual studio,微软提供了(le )一部分C运行时CRT的源(yuán )码,里面(miàn )会有memcpy,strcpy之(zhī )类的
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