merged from debian-sid

1 files changed, 88 insertions, 0 deletions

diff --git a/apt-pkg/contrib/macros.h b/apt-pkg/contrib/macros.h
new file mode 100644
index 000000000..9aeb77b81
--- /dev/null
+++ b/apt-pkg/contrib/macros.h
@@ -0,0 +1,88 @@
+// -*- 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
+
+#ifdef __GNUG__
+// Methods have a hidden this parameter that is visible to this attribute
+	#define __like_printf_1 __attribute__ ((format (printf, 2, 3)))
+	#define __like_printf_2 __attribute__ ((format (printf, 3, 4)))
+#else
+	#define __like_printf_1
+	#define __like_printf_2
+#endif
+
+#endif