texinfo/lib/memmove.c

   1 /* memmove.c -- copy memory.
   2    Copy LENGTH bytes from SOURCE to DEST.  Does not null-terminate.
   3    In the public domain.
   4    By David MacKenzie <djm@gnu.ai.mit.edu>.  */
   5
   6 #ifdef HAVE_CONFIG_H
   7 #include <config.h>
   8 #endif
   9
  10 void
  11 memmove (dest, source, length)
  12      char *dest;
  13      const char *source;
  14      unsigned length;
  15 {
  16   if (source < dest)
  17     /* Moving from low mem to hi mem; start at end.  */
  18     for (source += length, dest += length; length; --length)
  19       *--dest = *--source;
  20   else if (source != dest)
  21     /* Moving from hi mem to low mem; start at beginning.  */
  22     for (; length; --length)
  23       *dest++ = *source++;
  24 }