memmove - copy memory area src和dst的内存区域可以重叠

MEMMOVE(3)                 Linux Programmer's Manual                MEMMOVE(3)

NAME

       memmove - copy memory area

SYNOPSIS

       #include

       void *memmove(void *dest, const void *src, size_t n);

DESCRIPTION

       The  memmove()  function  copies n bytes from memory area src to memory

       area dest.  The memory areas may overlap: copying takes place as though

       the  bytes in src are first copied into a temporary array that does not

       overlap src or dest, and the bytes are then copied from  the  temporary

       array to dest.（src和dst的内存区域可以重叠，因为实现原理是先把需要复制的n个字节复制到一个临时的数组中，然后再从数组中复制到dst）

RETURN VALUE

       The memmove() function returns a pointer to dest.

CONFORMING TO

       SVr4, 4.3BSD, C89, C99, POSIX.1-2001.

SEE ALSO

       bcopy(3), memccpy(3), memcpy(3), strcpy(3), strncpy(3), wmemmove(3)

COLOPHON

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       description of the project, and information about reporting  bugs,  can

       be found at

GNU                               1993-04-10                        MEMMOVE(3)