mempcpy(3) Linux Man Page - System Grab Bag

Name

mempcpy, wmempcpy - copy memory area

Library

Standard C library ( libc ", " -lc )

Synopsis

"#define(7)_GNU_SOURCE" "         /* See feature_test_macros */" #include <string.h> 
void *mempcpy(void " dest "[restrict ." n "], const void " src "[restrict . n ],
              size_t  n );
"#define(7)_GNU_SOURCE" "         /* See feature_test_macros */" #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.

Attributes

For an explanation of the terms used in this section, see attributes(7). allbox; lbx lb lb T{ mempcpy()wmempcpy()

Interface	Attribute	Value
T}	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;
}