X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=hv.h;h=6a51ca40b2d570f21103a0d789a8492a6ff45518;hb=cebd85e6fca2f450b0cc02ffa6ad2fdfdf763f59;hp=4979fdd8b636b2da22b067ba3f9cda5d9e0d7c49;hpb=ceea138788c46b183220c4e9ce5aee45bb27dfa4;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/hv.h b/hv.h
index 4979fdd..6a51ca4 100644
--- a/hv.h
+++ b/hv.h
@@ -1,6 +1,7 @@
 /*    hv.h
  *
- *    Copyright (c) 1991-2002, Larry Wall
+ *    Copyright (C) 1991, 1992, 1993, 1996, 1997, 1998, 1999,
+ *    2000, 2001, 2002, by Larry Wall and others
  *
  *    You may distribute under the terms of either the GNU General Public
  *    License or the Artistic License, as specified in the README file.
@@ -47,12 +48,19 @@ struct xpvhv {
 };
 
 /* hash a key */
-/* FYI: This is the "One-at-a-Time" algorithm by Bob Jenkins */
-/* from requirements by Colin Plumb. */
-/* (http://burtleburtle.net/bob/hash/doobs.html) */
+/* FYI: This is the "One-at-a-Time" algorithm by Bob Jenkins
+ * from requirements by Colin Plumb.
+ * (http://burtleburtle.net/bob/hash/doobs.html) */
+/* The use of a temporary pointer and the casting games
+ * is needed to serve the dual purposes of
+ * (a) the hashed data being interpreted as "unsigned char" (new since 5.8,
+ *     a "char" can be either signed or signed, depending on the compiler)
+ * (b) catering for old code that uses a "char"
+ */
 #define PERL_HASH(hash,str,len) \
      STMT_START	{ \
-	register const unsigned char *s_PeRlHaSh = str; \
+	register const char *s_PeRlHaSh_tmp = str; \
+	register const unsigned char *s_PeRlHaSh = (const unsigned char *)s_PeRlHaSh_tmp; \
 	register I32 i_PeRlHaSh = len; \
 	register U32 hash_PeRlHaSh = 0; \
 	while (i_PeRlHaSh--) { \