1首先标(biāo )准只(zhī )是(shì )规定(dìng )了(le )这些函数的接口和具体(tǐ )的运(yùn )行效率的要求,这(zhè )些函数(shù )具体(tǐ )是(shì )怎么写得要看各(gè )个编译器的实现和平台(tái )2例如(rú )使用(yòng )的编译(yì )器是visual studio,微软(ruǎn )提供(gòng )了(le )一(yī )部分(fèn )C运(yùn )行时CRT的源(yuán )码,里面(miàn )会有(yǒu )memcpy,strcpy之类的
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