use _GL_ATTRIBUTE_CONST and _GL_ATTRIBUTE_PURE

[pspp] / lib / memchr2.c

diff --git a/lib/memchr2.c b/lib/memchr2.c
index 1ad936be96b1eab8ce6220045baf60f507afce67..b830b9d0b2950f4bdd25e3267dfeaa6b88f40e37 100644 (file)
--- a/lib/memchr2.c
+++ b/lib/memchr2.c
@@ -1,5 +1,5 @@
-/* Copyright (C) 1991, 1993, 1996, 1997, 1999, 2000, 2003, 2004, 2006, 2008,
-   2009, 2010 Free Software Foundation, Inc.
+/* Copyright (C) 1991, 1993, 1996-1997, 1999-2000, 2003-2004, 2006, 2008-2011
+   Free Software Foundation, Inc.
 
    Based on strlen implementation by Torbjorn Granlund (tege@sics.se),
    with help from Dan Sahlin (dan@sics.se) and
@@ -29,10 +29,18 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <stdint.h>
 #include <string.h>
 
+/* The attribute __pure__ was added in gcc 2.96.  */
+#undef _GL_ATTRIBUTE_PURE
+#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
+# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
+#else
+# define _GL_ATTRIBUTE_PURE /* empty */
+#endif
+
 /* Return the first address of either C1 or C2 (treated as unsigned
    char) that occurs within N bytes of the memory region S.  If
    neither byte appears, return NULL.  */
-void *
+void * _GL_ATTRIBUTE_PURE
 memchr2 (void const *s, int c1_in, int c2_in, size_t n)
 {
   /* On 32-bit hardware, choosing longword to be a 32-bit unsigned