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authorDavid Kalnischkies <kalnischkies@gmail.com>2010-01-30 22:19:57 +0100
committerDavid Kalnischkies <kalnischkies@gmail.com>2010-01-30 22:19:57 +0100
commit5c0d3668dd2b6852812502f33d64b1644c2b137a (patch)
tree17b08a15d0156293caf74798e5a7c7a68daf41f6 /apt-pkg/contrib/macros.h
parent2a75daa6be0647be3cc405f0ad9ed4f9f8638429 (diff)
* apt-pkg/contrib/macros.h:
- move the header system.h with a new name to the public domain, to be able to use it in other headers (Closes: #567662)
Diffstat (limited to 'apt-pkg/contrib/macros.h')
-rw-r--r--apt-pkg/contrib/macros.h79
1 files changed, 79 insertions, 0 deletions
diff --git a/apt-pkg/contrib/macros.h b/apt-pkg/contrib/macros.h
new file mode 100644
index 000000000..e53eb32df
--- /dev/null
+++ b/apt-pkg/contrib/macros.h
@@ -0,0 +1,79 @@
+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ Macros Header - Various useful macro definitions
+
+ This source is placed in the Public Domain, do with it what you will
+ It was originally written by Brian C. White.
+
+ ##################################################################### */
+ /*}}}*/
+// Private header
+#ifndef MACROS_H
+#define MACROS_H
+
+// MIN_VAL(SINT16) will return -0x8000 and MAX_VAL(SINT16) = 0x7FFF
+#define MIN_VAL(t) (((t)(-1) > 0) ? (t)( 0) : (t)(((1L<<(sizeof(t)*8-1)) )))
+#define MAX_VAL(t) (((t)(-1) > 0) ? (t)(-1) : (t)(((1L<<(sizeof(t)*8-1))-1)))
+
+// Min/Max functions
+#if !defined(MIN)
+#if defined(__HIGHC__)
+#define MIN(x,y) _min(x,y)
+#define MAX(x,y) _max(x,y)
+#endif
+
+// GNU C++ has a min/max operator <coolio>
+#if defined(__GNUG__)
+#define MIN(A,B) ((A) <? (B))
+#define MAX(A,B) ((A) >? (B))
+#endif
+
+/* Templates tend to mess up existing code that uses min/max because of the
+ strict matching requirements */
+#if !defined(MIN)
+#define MIN(A,B) ((A) < (B)?(A):(B))
+#define MAX(A,B) ((A) > (B)?(A):(B))
+#endif
+#endif
+
+/* Bound functions, bound will return the value b within the limits a-c
+ bounv will change b so that it is within the limits of a-c. */
+#define _bound(a,b,c) MIN(c,MAX(b,a))
+#define _boundv(a,b,c) b = _bound(a,b,c)
+#define ABS(a) (((a) < (0)) ?-(a) : (a))
+
+/* Usefull count macro, use on an array of things and it will return the
+ number of items in the array */
+#define _count(a) (sizeof(a)/sizeof(a[0]))
+
+// Flag Macros
+#define FLAG(f) (1L << (f))
+#define SETFLAG(v,f) ((v) |= FLAG(f))
+#define CLRFLAG(v,f) ((v) &=~FLAG(f))
+#define CHKFLAG(v,f) ((v) & FLAG(f) ? true : false)
+
+// some nice optional GNUC features
+#if __GNUC__ >= 3
+ #define __must_check __attribute__ ((warn_unused_result))
+ #define __deprecated __attribute__ ((deprecated))
+ /* likely() and unlikely() can be used to mark boolean expressions
+ as (not) likely true which will help the compiler to optimise */
+ #define likely(x) __builtin_expect (!!(x), 1)
+ #define unlikely(x) __builtin_expect (!!(x), 0)
+#else
+ #define __must_check /* no warn_unused_result */
+ #define __deprecated /* no deprecated */
+ #define likely(x) (x)
+ #define unlikely(x) (x)
+#endif
+
+// cold functions are unlikely() to be called
+#if (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4
+ #define __cold __attribute__ ((__cold__))
+#else
+ #define __cold /* no cold marker */
+#endif
+
+#endif