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MEMPCPY(3) Linux Programmer's Manual MEMPCPY(3)
NAME
mempcpy, wmempcpy - copy memory area
SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <string.h>
void *mempcpy(void *restrict dest, const void *restrict src, size_t n);
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <wchar.h>
wchar_t *wmempcpy(wchar_t *restrict dest, const wchar_t *restrict src,
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 in version 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 │
└──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘
CONFORMING TO
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;
}
SEE ALSO
memccpy(3), memcpy(3), memmove(3), wmemcpy(3)
GNU 2021-03-22 MEMPCPY(3)