---
name: "mempcpy"
section: "3"
platform: "linux"
package: "man-pages"
version: "6.19-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux", "freebsd"]
url: "https://new.carta.tech/mempcpy"
---

# mempcpy(3)

memory return-offset-pointer copy

## NAME

mempcpy - memory return-offset-pointer copy

## LIBRARY

Standard C library (*libc*, *-lc*)

## SYNOPSIS

```
#define _GNU_SOURCE         /* See feature_test_macros(7) */
#include <string.h>  // see memory.h(3head)
```

**void \*mempcpy(**size\_t n;               **void** *dest***\[restrict** *n***\], const void** *src***\[restrict** *n***\],**               **size\_t** *n***);**

## DESCRIPTION

This function is similar to [**memcpy**(3)](/memcpy/3.md), but it returns a pointer to one past the last written byte.

It is equivalent to

```
memcpy(dest, src, n) + n
```

## RETURN VALUE

*dest* + *n*.

## ATTRIBUTES

For an explanation of the terms used in this section, see [**attributes**(7)](/attributes/7.md).

| | | |
| --- | --- | --- |
| **Interface** | **Attribute** | **Value** |
| **mempcpy**() | Thread safety | MT-Safe |

## STANDARDS

GNU.

## HISTORY

glibc 2.1.

## EXAMPLES

```
void *
combine(void *o1, size_t s1, void *o2, size_t s2)
{
    void *result = malloc(s1 + s2);
    if (result != NULL)
        mempcpy(mempcpy(result, o1, s1), o2, s2);
    return result;
}
```

## SEE ALSO

[**memory.h**(3head)](/memory.h/3head.md), [**memccpy**(3)](/memccpy/3.md), [**memcpy**(3)](/memcpy/3.md), [**wmempcpy**(3)](/wmempcpy/3.md)