maint: update copyright

[gnulib.git] / lib / memchr2.c

diff --git a/lib/memchr2.c b/lib/memchr2.c
index b830b9d..3d79f2a 100644 (file)
--- a/lib/memchr2.c
+++ b/lib/memchr2.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991, 1993, 1996-1997, 1999-2000, 2003-2004, 2006, 2008-2011
+/* Copyright (C) 1991, 1993, 1996-1997, 1999-2000, 2003-2004, 2006, 2008-2014
    Free Software Foundation, Inc.
 
    Based on strlen implementation by Torbjorn Granlund (tege@sics.se),
@@ -29,18 +29,10 @@ 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 * _GL_ATTRIBUTE_PURE
+void *
 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
@@ -51,6 +43,7 @@ memchr2 (void const *s, int c1_in, int c2_in, size_t n)
   typedef unsigned long int longword;
 
   const unsigned char *char_ptr;
+  void const *void_ptr;
   const longword *longword_ptr;
   longword repeated_one;
   longword repeated_c1;
@@ -65,14 +58,18 @@ memchr2 (void const *s, int c1_in, int c2_in, size_t n)
     return memchr (s, c1, n);
 
   /* Handle the first few bytes by reading one byte at a time.
-     Do this until CHAR_PTR is aligned on a longword boundary.  */
-  for (char_ptr = (const unsigned char *) s;
-       n > 0 && (size_t) char_ptr % sizeof (longword) != 0;
-       --n, ++char_ptr)
-    if (*char_ptr == c1 || *char_ptr == c2)
-      return (void *) char_ptr;
+     Do this until VOID_PTR is aligned on a longword boundary.  */
+  for (void_ptr = s;
+       n > 0 && (uintptr_t) void_ptr % sizeof (longword) != 0;
+       --n)
+    {
+      char_ptr = void_ptr;
+      if (*char_ptr == c1 || *char_ptr == c2)
+        return (void *) void_ptr;
+      void_ptr = char_ptr + 1;
+    }
 
-  longword_ptr = (const longword *) char_ptr;
+  longword_ptr = void_ptr;
 
   /* All these elucidatory comments refer to 4-byte longwords,
      but the theory applies equally well to any size longwords.  */
@@ -133,7 +130,7 @@ memchr2 (void const *s, int c1_in, int c2_in, size_t n)
      significant bytes (positions j+1..3), but it does not matter since we
      already have a non-zero bit at position 8*j+7.
 
-     Similary, we compute tmp2 =
+     Similarly, we compute tmp2 =
        ((longword2 - repeated_one) & ~longword2) & (repeated_one << 7).
 
      The test whether any byte in longword1 or longword2 is zero is equivalent