X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fshared%2Fmacro.h;h=53bd578d7e03d49ebae396b183fdf10140b3434d;hb=4d40d39cdf127a83acf80cd0275e36b4a9a2a246;hp=08a036b3b95d497743d5d95cf9396b74498d3b61;hpb=1c231f56482546725c4dbd3303f70300bd3c63e9;p=elogind.git

diff --git a/src/shared/macro.h b/src/shared/macro.h
index 08a036b3b..53bd578d7 100644
--- a/src/shared/macro.h
+++ b/src/shared/macro.h
@@ -100,6 +100,19 @@ static inline size_t ALIGN_TO(size_t l, size_t ali) {
 
 #define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) p, ali))
 
+/* align to next higher power-of-2 (except for: 0 => 0, overflow => 0) */
+static inline unsigned long ALIGN_POWER2(unsigned long u) {
+        /* clz(0) is undefined */
+        if (u == 1)
+                return 1;
+
+        /* left-shift overflow is undefined */
+        if (__builtin_clzl(u - 1UL) < 1)
+                return 0;
+
+        return 1UL << (sizeof(u) * 8 - __builtin_clzl(u - 1UL));
+}
+
 #define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
 
 /*
@@ -324,13 +337,14 @@ do {                                                                    \
 #define SET_FLAG(v, flag, b) \
         (v) = (b) ? ((v) | (flag)) : ((v) & ~(flag))
 
-#define IN_SET(x, ...)                                                  \
+#define IN_SET(x, y, ...)                                               \
         ({                                                              \
-                const typeof(x) _x = (x);                               \
+                const typeof(y) _y = (y);                               \
+                const typeof(_y) _x = (x);                              \
                 unsigned _i;                                            \
                 bool _found = false;                                    \
-                for (_i = 0; _i < sizeof((const typeof(_x)[]) { __VA_ARGS__ })/sizeof(const typeof(_x)); _i++) \
-                        if (((const typeof(_x)[]) { __VA_ARGS__ })[_i] == _x) { \
+                for (_i = 0; _i < 1 + sizeof((const typeof(_x)[]) { __VA_ARGS__ })/sizeof(const typeof(_x)); _i++) \
+                        if (((const typeof(_x)[]) { _y, __VA_ARGS__ })[_i] == _x) { \
                                 _found = true;                          \
                                 break;                                  \
                         }                                               \