1首先标准(zhǔn )只(zhī )是规定(dìng )了这(zhè )些(xiē )函(hán )数的接(jiē )口和(hé )具体的运行效率的要(yào )求,这(zhè )些函数具体(tǐ )是(shì )怎么写(xiě )得(dé )要看(kàn )各(gè )个编译器的实现和平台(tái )2例(lì )如(rú )使(shǐ )用(yòng )的编译器是(shì )visual studio,微软(ruǎn )提供了一(yī )部分C运行时CRT的源码,里面会有memcpy,strcpy之(zhī )类的
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