[Emacs-diffs] emacs-25 916abe9: Use memmove instead of memcpy on overlapping regions

[Noam Postavsky]

branch: emacs-25
commit 916abe91fd250fc5ed27ec0be7d57421e7908111
Author: Fredrik Bergroth <address@hidden>
Commit: Noam Postavsky <address@hidden>

    Use memmove instead of memcpy on overlapping regions
    
    * src/editfns.c (Ftranspose_regions): Regions may overlap, so
    use memmove instead of memcpy (bug#19213).
    
    Copyright-paperwork-exempt: yes
    
    This is a backport from trunk.
    (cherry picked from commit 354f9f0fc6cc05ed98883447f9b2f37943d79160)
---
 src/editfns.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/editfns.c b/src/editfns.c
index 360ec12..412745d 100644
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -4997,7 +4997,7 @@ Transposing beyond buffer boundaries is an error.  */)
          start2_addr = BYTE_POS_ADDR (start2_byte);
           memcpy (temp, start1_addr, len1_byte);
           memcpy (start1_addr, start2_addr, len2_byte);
-          memcpy (start1_addr + len2_byte, start1_addr + len1_byte, len_mid);
+          memmove (start1_addr + len2_byte, start1_addr + len1_byte, len_mid);
           memcpy (start1_addr + len2_byte + len_mid, temp, len1_byte);
          SAFE_FREE ();