mempcpy(3) — Linux manual page

mempcpy(3)               Library Functions Manual              mempcpy(3)

NAME         top

       mempcpy, wmempcpy  - copy memory area

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

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

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

DESCRIPTION         top

       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         top

       dest + n.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌──────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                            │ Attribute     │ Value   │
       ├──────────────────────────────────────┼───────────────┼─────────┤
       │ mempcpy(), wmempcpy()                │ Thread safety │ MT-Safe │
       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS         top

       GNU.

HISTORY         top

       glibc 2.1.

EXAMPLES         top

       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         top

       memccpy(3), memcpy(3), memmove(3), wmemcpy(3)

COLOPHON         top

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Linux man-pages 6.15            2025-06-28                     mempcpy(3)

Pages that refer to this page: memcpy(3),  wmemcpy(3),  string_copying(7)

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