X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fshared%2Fmacro.h;h=ae2971fad141f54959bc89d0e50675f5faa2497a;hp=2807bc74e849c65b4f6706c988580fed30a885c3;hb=6825a04de61f0bceab0ccddb34d825c3951caef1;hpb=418bcb0ce3b704ea26ee1b4a68706abca536f65a

diff --git a/src/shared/macro.h b/src/shared/macro.h
index 2807bc74e..ae2971fad 100644
--- a/src/shared/macro.h
+++ b/src/shared/macro.h
@@ -79,6 +79,9 @@
 #define XCONCATENATE(x, y) x ## y
 #define CONCATENATE(x, y) XCONCATENATE(x, y)
 
+#define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
+#define UNIQ __COUNTER__
+
 /* Rounds up */
 
 #define ALIGN4(l) (((l) + 3) & ~3)
@@ -92,15 +95,15 @@
 #error "Wut? Pointers are neither 4 nor 8 bytes long?"
 #endif
 
-#define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) p))
-#define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) p))
-#define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) p))
+#define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) (p)))
+#define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) (p)))
+#define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) (p)))
 
 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, 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) {
@@ -122,21 +125,22 @@ static inline unsigned long ALIGN_POWER2(unsigned long u) {
  * @ptr: the pointer to the member.
  * @type: the type of the container struct this is embedded in.
  * @member: the name of the member within the struct.
- *
  */
-#define container_of(ptr, type, member)                                 \
+#define container_of(ptr, type, member) __container_of(UNIQ, (ptr), type, member)
+#define __container_of(uniq, ptr, type, member)                         \
         __extension__ ({                                                \
-                        const typeof( ((type *)0)->member ) *__mptr = (ptr); \
-                        (type *)( (char *)__mptr - offsetof(type,member) ); \
-                })
+                const typeof( ((type*)0)->member ) *UNIQ_T(A, uniq) = (ptr); \
+                (type*)( (char *)UNIQ_T(A, uniq) - offsetof(type,member) ); \
+        })
 
 #undef MAX
-#define MAX(a,b)                                        \
+#define MAX(a, b) __MAX(UNIQ, (a), UNIQ, (b))
+#define __MAX(aq, a, bq, b)                             \
         __extension__ ({                                \
-                        const typeof(a) _a = (a);       \
-                        const typeof(b) _b = (b);       \
-                        _a > _b ? _a : _b;              \
-                })
+                const typeof(a) UNIQ_T(A, aq) = (a);    \
+                const typeof(b) UNIQ_T(B, bq) = (b);    \
+                UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
+        })
 
 /* evaluates to (void) if _A or _B are not constant or of different types */
 #define CONST_MAX(_A, _B) \
@@ -157,12 +161,13 @@ static inline unsigned long ALIGN_POWER2(unsigned long u) {
                 })
 
 #undef MIN
-#define MIN(a,b)                                        \
+#define MIN(a, b) __MIN(UNIQ, (a), UNIQ, (b))
+#define __MIN(aq, a, bq, b)                             \
         __extension__ ({                                \
-                        const typeof(a) _a = (a);       \
-                        const typeof(b) _b = (b);       \
-                        _a < _b ? _a : _b;              \
-                })
+                const typeof(a) UNIQ_T(A, aq) = (a);    \
+                const typeof(b) UNIQ_T(B, bq) = (b);    \
+                UNIQ_T(A,aq) < UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
+        })
 
 #define MIN3(x,y,z)                                     \
         __extension__ ({                                \
@@ -170,22 +175,38 @@ static inline unsigned long ALIGN_POWER2(unsigned long u) {
                         MIN(_c, z);                     \
                 })
 
-#define LESS_BY(A,B)                                    \
+#define LESS_BY(a, b) __LESS_BY(UNIQ, (a), UNIQ, (b))
+#define __LESS_BY(aq, a, bq, b)                         \
         __extension__ ({                                \
-                        const typeof(A) _A = (A);       \
-                        const typeof(B) _B = (B);       \
-                        _A > _B ? _A - _B : 0;          \
-                })
+                const typeof(a) UNIQ_T(A, aq) = (a);    \
+                const typeof(b) UNIQ_T(B, bq) = (b);    \
+                UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) - UNIQ_T(B,bq) : 0; \
+        })
 
-#ifndef CLAMP
-#define CLAMP(x, low, high)                                             \
+#undef CLAMP
+#define CLAMP(x, low, high) __CLAMP(UNIQ, (x), UNIQ, (low), UNIQ, (high))
+#define __CLAMP(xq, x, lowq, low, highq, high)                          \
         __extension__ ({                                                \
-                        const typeof(x) _x = (x);                       \
-                        const typeof(low) _low = (low);                 \
-                        const typeof(high) _high = (high);              \
-                        ((_x > _high) ? _high : ((_x < _low) ? _low : _x)); \
-                })
-#endif
+                const typeof(x) UNIQ_T(X,xq) = (x);                     \
+                const typeof(low) UNIQ_T(LOW,lowq) = (low);             \
+                const typeof(high) UNIQ_T(HIGH,highq) = (high);         \
+                        UNIQ_T(X,xq) > UNIQ_T(HIGH,highq) ?             \
+                                UNIQ_T(HIGH,highq) :                    \
+                                UNIQ_T(X,xq) < UNIQ_T(LOW,lowq) ?       \
+                                        UNIQ_T(LOW,lowq) :              \
+                                        UNIQ_T(X,xq);                   \
+        })
+
+/* [(x + y - 1) / y] suffers from an integer overflow, even though the
+ * computation should be possible in the given type. Therefore, we use
+ * [x / y + !!(x % y)]. Note that on "Real CPUs" a division returns both the
+ * quotient and the remainder, so both should be equally fast. */
+#define DIV_ROUND_UP(_x, _y)                                            \
+        __extension__ ({                                                \
+                const typeof(_x) __x = (_x);                            \
+                const typeof(_y) __y = (_y);                            \
+                (__x / __y + !!(__x % __y));                            \
+        })
 
 #define assert_se(expr)                                                 \
         do {                                                            \
@@ -217,7 +238,7 @@ static inline unsigned long ALIGN_POWER2(unsigned long u) {
 #else
 #define assert_cc(expr)                                                 \
         DISABLE_WARNING_DECLARATION_AFTER_STATEMENT;                    \
-        struct CONCATENATE(_assert_struct_, __LINE__) {                 \
+        struct CONCATENATE(_assert_struct_, __COUNTER__) {              \
                 char x[(expr) ? 0 : -1];                                \
         };                                                              \
         REENABLE_WARNING
@@ -254,6 +275,14 @@ static inline unsigned long ALIGN_POWER2(unsigned long u) {
 #define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p)))
 #define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u)))
 
+/* The following macros add 1 when converting things, since UID 0 is a
+ * valid UID, while the pointer NULL is special */
+#define PTR_TO_UID(p) ((uid_t) (((uintptr_t) (p))-1))
+#define UID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1))
+
+#define PTR_TO_GID(p) ((gid_t) (((uintptr_t) (p))-1))
+#define GID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1))
+
 #define memzero(x,l) (memset((x), 0, (l)))
 #define zero(x) (memzero(&(x), sizeof(x)))
 
@@ -374,6 +403,21 @@ do {                                                                    \
                 _found;                                                 \
         })
 
+/* Return a nulstr for a standard cascade of configuration directories,
+ * suitable to pass to conf_files_list_nulstr or config_parse_many. */
+#define CONF_DIRS_NULSTR(n) \
+        "/etc/" n ".d\0" \
+        "/run/" n ".d\0" \
+        "/usr/local/lib/" n ".d\0" \
+        "/usr/lib/" n ".d\0" \
+        CONF_DIR_SPLIT_USR(n)
+
+#ifdef HAVE_SPLIT_USR
+#define CONF_DIR_SPLIT_USR(n) "/lib/" n ".d\0"
+#else
+#define CONF_DIR_SPLIT_USR(n)
+#endif
+
 /* Define C11 thread_local attribute even on older gcc compiler
  * version */
 #ifndef thread_local
@@ -398,4 +442,15 @@ do {                                                                    \
 #endif
 #endif
 
+#define UID_INVALID ((uid_t) -1)
+#define GID_INVALID ((gid_t) -1)
+#define MODE_INVALID ((mode_t) -1)
+
+#define DEFINE_TRIVIAL_CLEANUP_FUNC(type, func)                 \
+        static inline void func##p(type *p) {                   \
+                if (*p)                                         \
+                        func(*p);                               \
+        }                                                       \
+        struct __useless_struct_to_allow_trailing_semicolon__
+
 #include "log.h"