cs24-23fa memcpy

Introduction to Computing Systems (Fall 2023)


memcpy - copy memory area


#include <string.h>

void *memcpy(void *dest, const void *src, size_t n);


The memcpy() function copies n byes from memory area src to memory area dest. The memory areas must not overlap: if they do, use memmove() instead.


#include <assert.h>
#include <string.h>

int main() {
    char src[6] = "hello";
    char dest[6];

    // Copy six bytes/chars, five letters plus null character. 
    memcpy(dest, src, 6);
    assert(strcmp(src, dest) == 0)  

Return Value

Upon completion, the memcpy() function returns a pointer to dest.

See Also

memmove(), strcpy(), strncpy(), strcmp()