X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fshared%2Fmacro.h;h=32cf714857809b5ec591cd484c9e1c0671654529;hp=5fd67c7abacde424a529e390d4ccff91f2ab5a39;hb=d442e2ec6e896c312bc616be7607332d978a45c9;hpb=8fca4e305f7f10cd739af8851ec341eab654bad0

diff --git a/src/shared/macro.h b/src/shared/macro.h
index 5fd67c7ab..32cf71485 100644
--- a/src/shared/macro.h
+++ b/src/shared/macro.h
@@ -63,6 +63,10 @@
         _Pragma("GCC diagnostic push");                                 \
         _Pragma("GCC diagnostic ignored \"-Wnonnull\"")
 
+#define DISABLE_WARNING_SHADOW                                          \
+        _Pragma("GCC diagnostic push");                                 \
+        _Pragma("GCC diagnostic ignored \"-Wshadow\"")
+
 #define REENABLE_WARNING                                                \
         _Pragma("GCC diagnostic pop")
 
@@ -98,7 +102,20 @@ static inline size_t ALIGN_TO(size_t l, size_t ali) {
         return ((l + ali - 1) & ~(ali - 1));
 }
 
-#define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) p))
+#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 +341,14 @@ 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;                                  \
                         }                                               \