Web Reference: Nov 23, 2015 · memset sets a block of memory to a single value. memcpy copies the content of a block into another block. Perhaps you'd be interested in the difference between memcpy and memmove. Oct 17, 2022 · memset may be optimized away (under the as-if rules) if the object modified by this function is not accessed again for the rest of its lifetime (e.g., gcc bug 8537). For that reason, this function cannot be used to scrub memory (e.g., to fill an array that stored a password with zeroes). Unlike memset, any call to the memset_s function is evaluated according to the rules of the abstract machine and considers that the memory indicated by s and n might be accessible in the future and contains the values indicated by c.
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