* macros.h (INCREMENT): New macro, moved from ctr.c. Deleted third

argument.
* ctr.c: Use INCREMENT macro from macros.h, deleted local version.

Rev: nettle/ChangeLog:1.128
Rev: nettle/ctr.c:1.2
Rev: nettle/macros.h:1.3

ChangeLog

+2011-02-05  Niels Mller  <nisse@lysator.liu.se>
+
+	* macros.h (INCREMENT): New macro, moved from ctr.c. Deleted third
+	argument.
+	* ctr.c: Use INCREMENT macro from macros.h, deleted local version.
+
 2011-01-07  Niels Mller  <nisse@lysator.liu.se>
 
 	* testsuite/Makefile.in (check): Add ../.lib to PATH, since that's

ctr.c

@@ -33,18 +33,9 @@
 
 #include "ctr.h"
 
+#include "macros.h"
 #include "memxor.h"
 #include "nettle-internal.h"
-
-#define INCREMENT(size, counter, i)		\
-do {						\
-  if (++(ctr)[(size) - 1] == 0)			\
-    {						\
-      unsigned i = size - 1;			\
-      while (i > 0 && ++(ctr)[--i] == 0)	\
-	;					\
-    }						\
-} while (0)
   
 void
 ctr_crypt(void *ctx, nettle_crypt_func f,
@@ -61,7 +52,7 @@ ctr_crypt(void *ctx, nettle_crypt_func f,
 	{
 	  f(ctx, block_size, dst, ctr);
 	  memxor(dst, src, block_size);
-	  INCREMENT(block_size, ctr, i);
+	  INCREMENT(block_size, ctr);
 	}
     }
   else
@@ -70,7 +61,7 @@ ctr_crypt(void *ctx, nettle_crypt_func f,
 	{
 	  f(ctx, block_size, buffer, ctr);
 	  memxor3(dst, src, buffer, block_size);
-	  INCREMENT(block_size, ctr, i);
+	  INCREMENT(block_size, ctr);
 	}      
     }
   if (length > 0)
@@ -79,6 +70,6 @@ ctr_crypt(void *ctx, nettle_crypt_func f,
 
       f(ctx, block_size, buffer, ctr);
       memxor3(dst, src, buffer, length);
-      INCREMENT(block_size, ctr, i);
+      INCREMENT(block_size, ctr);
     }
 }

macros.h

@@ -119,4 +119,16 @@ do {						\
 		  (dst) += (blocksize),		\
 		  (src) += (blocksize)) )
 
+/* Requires that size >= 2 */
+#define INCREMENT(size, ctr)			\
+  do {						\
+    unsigned increment_i = (size) - 1;		\
+    if (++(ctr)[increment_i] == 0)		\
+      {						\
+	while (++(ctr)[--increment_i] == 0	\
+	       && increment_i > 0)		\
+	  ;					\
+      }						\
+  } while (0)
+
 #endif /* NETTLE_MACROS_H_INCLUDED */