X-Git-Url: http://git.pond.sub.org/?p=empserver;a=blobdiff_plain;f=include%2Fmisc.h;h=9f4771b3e27431b6c151a211a4d7897e7c02d50c;hp=3e9387e9fb7cff3ad5274e1ab8fc0ac24247dadb;hb=87952c7f7c263dd2f4155982a3079dd5c1848663;hpb=98cd2a3a70be672a938c3240ca1f2494f0d506f8

diff --git a/include/misc.h b/include/misc.h
index 3e9387e9f..9f4771b3e 100644
--- a/include/misc.h
+++ b/include/misc.h
@@ -1,6 +1,6 @@
 /*
  *  Empire - A multi-player, client/server Internet based war game.
- *  Copyright (C) 1986-2011, Dave Pare, Jeff Bailey, Thomas Ruschak,
+ *  Copyright (C) 1986-2020, Dave Pare, Jeff Bailey, Thomas Ruschak,
  *                Ken Stevens, Steve McClure, Markus Armbruster
  *
  *  Empire is free software: you can redistribute it and/or modify
@@ -29,6 +29,7 @@
  *
  *  Known contributors to this file:
  *     Doug Hay, 1998
+ *     Markus Armbruster, 2004-2020
  */
 
 #ifndef MISC_H
@@ -37,6 +38,9 @@
 #define MAX(a,b) ((a) > (b) ? (a) : (b))
 #define MIN(a,b) ((a) < (b) ? (a) : (b))
 
+#define LIMIT_TO(val, min, max) \
+    ((val) < (min) ? (min) : (val) > (max) ? (max) : (val))
+
 #ifdef _WIN32
 #include "w32misc.h"
 #endif /* _WIN32 */
@@ -47,17 +51,8 @@
 #define ATTRIBUTE(attrs)
 #endif
 
-/*
- * This uses a lot of thread stack with some versions of GNU libc,
- * which can lead to nasty heap smashes (observed with 2.2.93).
- * Disabled for now, until we readjust thread stack sizes.
- */
-#if 0
-#define RESOLVE_IPADDRESS	/* resolve ip addresses into hostnames */
-#endif
-
 #ifndef bit
-#define bit(x)		(1<<(x))
+#define bit(x)		(1U<<(x))
 #endif
 
 #define minutes(x)	(60*(x))
@@ -65,8 +60,8 @@
 #define days(x)		(60*60*24*(x))
 
 /*
- * If EXPR is true, an internal error occured.
- * Return EXPR != 0.
+ * If @expr is true, an internal error occured.
+ * Return @expr != 0.
  * Usage: if (CANT_HAPPEN(...)) <recovery code>;
  */
 #define CANT_HAPPEN(expr) ((expr) ? oops(#expr, __FILE__, __LINE__), 1 : 0)
@@ -80,6 +75,25 @@
 extern void oops(char *, char *, int);
 extern void (*oops_handler)(void);
 
+/*
+ * Assert constant expression @cond, return 1.
+ * If @cond is zero, force a compilation error.
+ */
+#define BUILD_ASSERT_ONE(cond) \
+    (sizeof(char[1 - 2 * !(cond)]))
+
+/*
+ * Assert constant expression @cond.
+ * If @cond is zero, force a compilation error.
+ */
+#define BUILD_ASSERT(cond) \
+    ((void)BUILD_ASSERT_ONE(cond))
+
+/*
+ * Number of elements in ARRAY.
+ */
+#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
+
 void exit_nomem(void) ATTRIBUTE((noreturn));
 
 	/* return codes from command routines */
@@ -94,8 +108,4 @@ extern char *ugetstring(char *prompt, char buf[]);
 extern char *prbuf(char *format, ...)
     ATTRIBUTE((format (printf, 1, 2)));
 
-#define AGREE_FREE	0
-#define AGREE_PROPOSED	1
-#define AGREE_SIGNED	2
-
 #endif