mempcpy

Section: C Library Functions (3)
Updated: 2022-12-15
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NAME

mempcpy, wmempcpy - copy memory area

LIBRARY

Standard C library (libc, -lc)

SYNOPSIS

#define _GNU_SOURCE         /* See feature_test_macros(7) */
#include <string.h>

void *mempcpy(void dest[restrict .n], const void src[restrict .n],
              size_t n);

#define _GNU_SOURCE         /* See feature_test_macros(7) */
#include <wchar.h>

wchar_t *wmempcpy(wchar_t dest[restrict .n],
              const wchar_t src[restrict .n],
              size_t n);

DESCRIPTION

The mempcpy() function is nearly identical to the memcpy(3) function. It copies n bytes from the object beginning at src into the object pointed to by dest. But instead of returning the value of dest it returns a pointer to the byte following the last written byte.

This function is useful in situations where a number of objects shall be copied to consecutive memory positions.

The wmempcpy() function is identical but takes wchar_t type arguments and copies n wide characters.

RETURN VALUE

dest + n.

VERSIONS

mempcpy() first appeared in glibc 2.1.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
mempcpy(), wmempcpy()	Thread safety	MT-Safe

STANDARDS

This function is a GNU extension.

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; }

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Time: 04:10:12 GMT, April 26, 2024