memmove() — Copy Bytes

Format

#include <string.h>
void *memmove(void *dest, const void *src, size_t count);

Language Level

ANSI

Threadsafe

Yes

Description

The memmove() function copies count bytes of src to dest. This function allows copying between objects that might overlap as if src is first copied into a temporary array.

Return Value

The memmove() function returns a pointer to dest.

Example

This example copies the word "shiny" from position target + 2 to position target + 8. 
#include <string.h>
#include <stdio.h>
 
#define SIZE    21
 
char target[SIZE] = "a shiny white sphere";
 
int main( void )
{
  char * p = target + 8;  /* p points at the starting character
                          of the word we want to replace */
  char * source = target + 2; /* start of "shiny" */
 
  printf( "Before memmove, target is \"%s\"\n", target );
  memmove( p, source, 5 );
  printf( "After memmove, target becomes \"%s\"\n", target );
}
 
/*********************  Expected output:  ************************
 
Before memmove, target is "a shiny white sphere"
After memmove, target becomes "a shiny shiny sphere"
*/

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