[COMMITTED] [PATCH] Use PTR_ALIGN_DOWN on strcspn and strspn

[Adhemerval Zanella]

Following Roland's suggestion.  Tested on aarch64.

	* string/strcspn.c (strcspn): Use PTR_ALIGN_DOWN.
	* string/strspn.c (strspn): Likewise.
---
 ChangeLog        | 5 +++++
 string/strcspn.c | 3 ++-
 string/strspn.c  | 4 +++-
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/string/strcspn.c b/string/strcspn.c
index c535dd1..0e01193 100644
--- a/string/strcspn.c
+++ b/string/strcspn.c
@@ -17,6 +17,7 @@
 
 #include <string.h>
 #include <stdint.h>
+#include <libc-internal.h>
 
 #undef strcspn
 
@@ -52,7 +53,7 @@ STRCSPN (const char *str, const char *reject)
   if (p[s[2]]) return 2;
   if (p[s[3]]) return 3;
 
-  s = (unsigned char *) ((uintptr_t)(s) & ~3);
+  s = (unsigned char *) PTR_ALIGN_DOWN (s, 4);
 
   unsigned int c0, c1, c2, c3;
   do
diff --git a/string/strspn.c b/string/strspn.c
index f98340b..86f76ea 100644
--- a/string/strspn.c
+++ b/string/strspn.c
@@ -17,6 +17,7 @@
 
 #include <string.h>
 #include <stdint.h>
+#include <libc-internal.h>
 
 #undef strspn
 #ifndef STRSPN
@@ -58,7 +59,8 @@ STRSPN (const char *str, const char *accept)
   if (!p[s[2]]) return 2;
   if (!p[s[3]]) return 3;
 
-  s = (unsigned char *) ((uintptr_t)(s) & ~3);
+  s = (unsigned char *) PTR_ALIGN_DOWN (s, 4);
+
   unsigned int c0, c1, c2, c3;
   do {
       s += 4;
-- 
1.9.1