X-Git-Url: https://git.danieliu.xyz/?a=blobdiff_plain;f=include%2Fcommon.h;h=a67a0beae7cb902f8808f056bdd9e8892c9d9925;hb=354cf2e07ccd0d7900f96bffc279093997cbe203;hp=23b656c0aa11472900f3c211710c96990124af48;hpb=618df4fd72bc78c3012a0987ab9e7183a404b20c;p=smdp.git

diff --git a/include/common.h b/include/common.h
index 23b656c..a67a0be 100644
--- a/include/common.h
+++ b/include/common.h
@@ -1,6 +1,50 @@
 #if !defined( COMMON_H )
 #define COMMON_H
 
+/*
+ * Common macros.
+ * Copyright (C) 2018 Michael Goehler
+ *
+ * This file is part of mdp.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * type: bool variable stores only true or false.
+ *
+ * macro: MAX returns the higher one of two input variables
+ * macro: MIN returns the lower one of two input variables
+ *
+ */
+
+#if defined( __STDC__ )  // for standard C compiler
+#if __STDC_VERSION__ >= 199901L    // for C99 and later
+#include <stdbool.h>
+#else    // __STDC_VERSION__ >= 199901L
+#if !defined( bool )
+typedef enum {
+    false = 0,
+    true  = 1
+} bool;
+#endif   // !defined( bool )
+#endif   // __STDC_VERSION__ >= 199901L
+#else    // defined( __STDC__ )
+#define bool    int
+#define true    1
+#define false   0
+#endif   // defined( __STDC__ )
+
 #define MAX(a, b) ({ typeof(a) _a = a; typeof(b) _b = b; _a > _b? _a : _b; })
 #define MIN(a, b) ({ typeof(a) _a = a; typeof(b) _b = b; _a < _b? _a : _b; })