X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=para.h;h=08eb0ee6c20ab1a7779cc3f10de2b5fca094f44b;hp=1dcbb6d32a134db962abe7eb4e2a457c53d7f3fe;hb=c387b216b5fd3c944053e1bba024815719e9a0d9;hpb=b5b5d00eea33eccd3d2d75057c5254bf85568b00

diff --git a/para.h b/para.h
index 1dcbb6d3..08eb0ee6 100644
--- a/para.h
+++ b/para.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 1997-2010 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 1997-2011 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -70,7 +70,7 @@
 /** Version text used by various commands if -V switch was given. */
 #define VERSION_TEXT(prefix) "para_" prefix " " PACKAGE_VERSION \
 	" (" GIT_VERSION ": " CODENAME ")" "\n" \
-	"Copyright (C) 2010 Andre Noll\n" \
+	"Copyright (C) 2011 Andre Noll\n" \
 	"This is free software with ABSOLUTELY NO WARRANTY." \
 	" See COPYING for details.\n" \
 	"Written by Andre Noll.\n" \
@@ -165,13 +165,38 @@ _static_inline_ long int para_random(unsigned max)
 	return ((max + 0.0) * (random() / (RAND_MAX + 1.0)));
 }
 
+/** Round up x to next multiple of y. */
+#define ROUND_UP(x, y) ({ \
+	const typeof(y) _divisor = y; \
+	((x) + _divisor - 1) / _divisor * _divisor; })
+
+/** Round down x to multiple of y. */
+#define ROUND_DOWN(x, y) ({ \
+	const typeof(y) _divisor = y; \
+	(x) / _divisor * _divisor; })
+
 /** Divide and round up to next integer. */
 #define DIV_ROUND_UP(x, y) ({ \
 	typeof(y) _divisor = y; \
 	((x) + _divisor - 1) / _divisor; })
 
+/**
+ * Assert a build-time dependency, as an expression.
+ *
+ * \param cond The compile-time condition which must be true.
+ *
+ * Compilation will fail if the condition isn't true, or can't be evaluated by
+ * the compiler. This can be used in an expression: its value is "0".
+ *
+ * Taken from ccan.
+ */
+#define EXPR_BUILD_ASSERT(cond) (sizeof(char [1 - 2 * !(cond)]) - 1)
+
+/* &a[0] degrades to a pointer: a different type from an array */
+#define _array_size_chk(arr) EXPR_BUILD_ASSERT(\
+	!__builtin_types_compatible_p(typeof(arr), typeof(&(arr)[0])))
 /** Get the size of an array */
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + _array_size_chk(arr))
 
 /**
  * Wrapper for isspace.
@@ -196,6 +221,9 @@ _static_inline_ long int para_random(unsigned max)
 /** Used to avoid a shortcoming in vim's syntax highlighting. */
 #define EMBRACE(...) { __VA_ARGS__}
 
+/** A nice cup of STFU for Mr gcc. */
+#define do_nothing do {/* nothing */} while (0)
+
 /**
  * The sample formats supported by paraslash.
  *