From: Ben Pfaff <blp@cs.stanford.edu>
Date: Thu, 8 Apr 2010 04:39:06 +0000 (-0700)
Subject: hash-functions: New function hash_pointer().
X-Git-Tag: sav-api~328
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?p=pspp;a=commitdiff_plain;h=00682302c6f2ea7b64370105f10f010e16fe022e

hash-functions: New function hash_pointer().
---

diff --git a/src/libpspp/hash-functions.c b/src/libpspp/hash-functions.c
index f9f1f0e165..a72ee06e18 100644
--- a/src/libpspp/hash-functions.c
+++ b/src/libpspp/hash-functions.c
@@ -1,5 +1,5 @@
 /* PSPP - a program for statistical analysis.
-   Copyright (C) 1997-9, 2000, 2008, 2009 Free Software Foundation, Inc.
+   Copyright (C) 1997-9, 2000, 2008, 2009, 2010 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -172,3 +172,12 @@ hash_double (double d, unsigned int basis)
   return hash_bytes (&d, sizeof d, basis);
 #endif /* SIZEOF_DOUBLE != 8 */
 }
+
+/* Returns a hash value for pointer P, starting from BASIS. */
+unsigned int
+hash_pointer (const void *p, unsigned int basis)
+{
+  /* Casting to uintptr_t before casting to int suppresses a GCC warning about
+     on 64-bit platforms. */
+  return hash_int ((int) (uintptr_t) p, basis);
+}
diff --git a/src/libpspp/hash-functions.h b/src/libpspp/hash-functions.h
index 089134b43f..bdf3da31ab 100644
--- a/src/libpspp/hash-functions.h
+++ b/src/libpspp/hash-functions.h
@@ -1,5 +1,5 @@
 /* PSPP - a program for statistical analysis.
-   Copyright (C) 1997-9, 2000, 2009 Free Software Foundation, Inc.
+   Copyright (C) 1997-9, 2000, 2009, 2010 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -24,5 +24,6 @@ unsigned int hash_string (const char *, unsigned int basis);
 unsigned int hash_case_string (const char *, unsigned int basis);
 unsigned int hash_int (int, unsigned int basis);
 unsigned int hash_double (double, unsigned int basis);
+unsigned int hash_pointer (const void *, unsigned int basis);
 
 #endif /* libpspp/hash-functions.h */