macro: add a macro to test whether a value is in a specified list

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

diff --git a/src/shared/macro.h b/src/shared/macro.h
index aadb1959c033247594d97a71df182145cb161bba..54b641be2361593e9d2b57625e5450aea626817f 100644 (file)
--- a/src/shared/macro.h
+++ b/src/shared/macro.h
@@ -53,6 +53,11 @@
 #define XSTRINGIFY(x) #x
 #define STRINGIFY(x) XSTRINGIFY(x)
 
+#define XCONCATENATE(x, y) x ## y
+#define CONCATENATE(x, y) XCONCATENATE(x, y)
+
+#define UNIQUE(prefix) CONCATENATE(prefix, __LINE__)
+
 /* Rounds up */
 
 #define ALIGN4(l) (((l) + 3) & ~3)
@@ -145,9 +150,7 @@ static inline size_t ALIGN_TO(size_t l, size_t ali) {
 #if defined(static_assert)
 #define assert_cc(expr) static_assert(expr, #expr)
 #else
-#define assert___cc(expr, line) struct _assert_struct_ ## line { char x[(expr) ? 0 : -1]; }
-#define assert__cc(expr, line) assert___cc((expr), line)
-#define assert_cc(expr) assert__cc((expr), __LINE__)
+#define assert_cc(expr) struct UNIQUE(_assert_struct_) { char x[(expr) ? 0 : -1]; };
 #endif
 
 #define assert_return(expr, r)                    \
@@ -264,7 +267,7 @@ do {                                                                    \
         }                                                               \
 } while(false)
 
- /* Because statfs.t_type can be int on some architecures, we have to cast
+ /* Because statfs.t_type can be int on some architectures, we have to cast
   * the const magic to the type, otherwise the compiler warns about
   * signed/unsigned comparison, because the magic can be 32 bit unsigned.
  */
@@ -274,7 +277,7 @@ do {                                                                    \
  * specified type as a decimal string. Adds in extra space for a
  * negative '-' prefix. */
 #define DECIMAL_STR_MAX(type)                                           \
-        (1+(sizeof(type) <= 1 ? 3 :                                     \
+        (2+(sizeof(type) <= 1 ? 3 :                                     \
             sizeof(type) <= 2 ? 5 :                                     \
             sizeof(type) <= 4 ? 10 :                                    \
             sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
@@ -282,4 +285,17 @@ do {                                                                    \
 #define SET_FLAG(v, flag, b) \
         (v) = (b) ? ((v) | (flag)) : ((v) & ~(flag))
 
+#define IN_SET(x, ...) ({                                               \
+        typeof(x) _x = (x);                                             \
+        unsigned _i;                                                    \
+        bool _found = false;                                            \
+        for (_i = 0; _i < sizeof((typeof(_x)[]) { __VA_ARGS__ })/sizeof(typeof(_x)); _i++) \
+                if (((typeof(_x)[]) { __VA_ARGS__ })[_i] == _x) {       \
+                        _found = true;                                  \
+                        break;                                          \
+                }                                                       \
+        _found;                                                         \
+        })
+
+
 #include "log.h"