errno is positive

[elogind.git] / src / shared / macro.h

diff --git a/src/shared/macro.h b/src/shared/macro.h
index 4e5d0f4f2f8d304e10403b34a31378785c087e37..84a453a8f27319778eca17e5bd3e26330860dea4 100644 (file)
--- a/src/shared/macro.h
+++ b/src/shared/macro.h
@@ -53,7 +53,18 @@
 #define STRINGIFY(x) XSTRINGIFY(x)
 
 /* Rounds up */
-#define ALIGN(l) ALIGN_TO((l), sizeof(void*))
+
+#define ALIGN4(l) (((l) + 3) & ~3)
+#define ALIGN8(l) (((l) + 7) & ~7)
+
+#if __SIZEOF_POINTER__ == 8
+#define ALIGN(l) ALIGN8(l)
+#elif __SIZEOF_POINTER__ == 4
+#define ALIGN(l) ALIGN4(l)
+#else
+#error "Wut? Pointers are neither 4 nor 8 bytes long?"
+#endif
+
 static inline size_t ALIGN_TO(size_t l, size_t ali) {
         return ((l + ali - 1) & ~(ali - 1));
 }
@@ -67,9 +78,11 @@ static inline size_t ALIGN_TO(size_t l, size_t ali) {
  * @member: the name of the member within the struct.
  *
  */
-#define container_of(ptr, type, member) ({ \
-        const typeof( ((type *)0)->member ) *__mptr = (ptr); \
-        (type *)( (char *)__mptr - offsetof(type,member) );})
+#define container_of(ptr, type, member)                                 \
+        __extension__ ({                                                \
+                        const typeof( ((type *)0)->member ) *__mptr = (ptr); \
+                        (type *)( (char *)__mptr - offsetof(type,member) ); \
+                })
 
 #undef MAX
 #define MAX(a,b)                                 \
@@ -255,4 +268,14 @@ do {                                                                    \
         }                                                               \
 } while(false)
 
+/* Returns the number of chars needed to format variables of the
+ * specified type as a decimal string. Adds in extra space for a
+ * negative '-' prefix. */
+
+#define DECIMAL_STR_MAX(type)                                           \
+        (1+(sizeof(type) <= 1 ? 3 :                                     \
+            sizeof(type) <= 2 ? 5 :                                     \
+            sizeof(type) <= 4 ? 10 :                                    \
+            sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
+
 #include "log.h"