Imported Upstream version 93u+upstream

1 files changed, 53 insertions, 0 deletions

diff --git a/src/lib/libast/hash/strsum.c b/src/lib/libast/hash/strsum.c
new file mode 100644
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--- /dev/null
+++ b/src/lib/libast/hash/strsum.c
@@ -0,0 +1,53 @@
+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
+*                      and is licensed under the                       *
+*                 Eclipse Public License, Version 1.0                  *
+*                    by AT&T Intellectual Property                     *
+*                                                                      *
+*                A copy of the License is available at                 *
+*          http://www.eclipse.org/org/documents/epl-v10.html           *
+*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
+*                                                                      *
+*              Information and Software Systems Research               *
+*                            AT&T Research                             *
+*                           Florham Park NJ                            *
+*                                                                      *
+*                 Glenn Fowler <gsf@research.att.com>                  *
+*                  David Korn <dgk@research.att.com>                   *
+*                   Phong Vo <kpv@research.att.com>                    *
+*                                                                      *
+***********************************************************************/
+#pragma prototyped
+/*
+ * Glenn Fowler
+ * AT&T Bell Laboratories
+ *
+ * hash table library
+ */
+
+#include "hashlib.h"
+
+/*
+ * return a running 32 bit checksum of string s
+ *
+ * c is the return value from a previous
+ * memsum() or strsum() call, 0 on the first call
+ *
+ * the result is the same on all implementations
+ */
+
+unsigned long
+strsum(const char* as, register unsigned long c)
+{
+	register const unsigned char*	s = (const unsigned char*)as;
+	register int			n;
+
+	while (n = *s++) HASHPART(c, n);
+#if LONG_MAX > 2147483647
+	return(c & 0xffffffff);
+#else
+	return(c);
+#endif
+}