The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.

#### NAME

> memcpy - copy bytes in memory

#### SYNOPSIS

> ``#include <string.h>
> void *memcpy(void *restrict` s1`, const void *restrict` s2`, size_t` n`);
> ``

#### DESCRIPTION

> [CX] 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 IEEE Std 1003.1-2001 defers to the ISO C standard.

> 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

> The Base Definitions volume of IEEE Std 1003.1-2001, <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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