Add timeradd and timersub for those without them

diff --git a/compat.h b/compat.h
index 7cededc65de874d09416422da082531f35ee2fb2..b317d1863dd22e7685892d1e420563dde6ce18c9 100644 (file)
--- a/compat.h
+++ b/compat.h
@@ -276,4 +276,28 @@ const char *getprogname __P((void));
     } while (0)
 #endif
 
+#ifndef timeradd
+# define timeradd(tv1, tv2, total)                                            \
+    do {                                                                      \
+       (total)->tv_sec = (tv1)->tv_sec + (tv2)->tv_sec;                       \
+       (total)->tv_usec = (tv1)->tv_usec + (tv2)->tv_usec;                    \
+       if ((total)->tv_usec >= 1000000) {                                     \
+           (total)->tv_sec++;                                                 \
+           (total)->tv_usec -= 1000000;                                       \
+       }                                                                      \
+    } while (0)
+#endif
+
+#ifndef timersub
+# define timersub(minuend, subrahend, difference)                             \
+    do {                                                                      \
+       (difference)->tv_sec = (minuend)->tv_sec - (subrahend)->tv_sec;        \
+       (difference)->tv_usec = (minuend)->tv_usec - (subrahend)->tv_usec;     \
+       if ((difference)->tv_usec < 0) {                                       \
+           (difference)->tv_sec--;                                            \
+           (difference)->tv_usec += 1000000;                                  \
+       }                                                                      \
+    } while (0)
+#endif
+
 #endif /* _SUDO_COMPAT_H */