The Open Group Base Specifications Issue 7, 2018 edition
IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008)
Copyright © 2001-2018 IEEE and The Open Group
NAME
memcpy - copy bytes in memory
SYNOPSIS
#include <string.h>
void *memcpy(void *restrict s1, const void *restrict s2, size_t n);
DESCRIPTION
[CX] ![[Option Start]](../images/opt-start.gif)
The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the
requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2017 defers to the ISO C
standard.
![[Option End]](../images/opt-end.gif)
The memcpy() function shall copy n bytes from the object pointed to by s2 into the object pointed to by
s1. If copying takes place between objects that overlap, the behavior is undefined.
RETURN VALUE
The memcpy() function shall return s1; no return value is reserved to indicate an error.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
The memcpy() function does not check for the overflow of the receiving memory area.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
XBD <string.h>
CHANGE HISTORY
First released in Issue 1. Derived from Issue 1 of the SVID.
Issue 6
The memcpy() prototype is updated for alignment with the ISO/IEC 9899:1999 standard.
End of informative text.
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