From 83a4e8c552ecceb190e2805eac8dd7a6b520e30a Mon Sep 17 00:00:00 2001
From: Alfred Neumayer <dev.beidl@gmail.com>
Date: Thu, 15 Oct 2020 18:17:38 +0200
Subject: [PATCH] definitions.mk: Backport math functions/defines

Used by some Sony components (macaddrsetup) to determine which init.rc to ship.

Change-Id: I2db958a997e399237fc1d93120d4e6b1fa1fa4a3
---
 core/definitions.mk | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/core/definitions.mk b/core/definitions.mk
index bca474e732d..c7bd23a47e6 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -2893,6 +2893,43 @@ $(strip $(if $(filter $(TARGET_ARCH),$(1)),$(TARGET_ARCH),\
   $(if $(filter $(TARGET_2ND_ARCH),$(1)),$(TARGET_2ND_ARCH),$(if $(1),none))))
 endef
 
+###########################################################
+# Basic math functions for positive integers <= 100
+#
+# (SDK versions for example)
+###########################################################
+__MATH_NUMBERS :=  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 \
+                  21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 \
+                  41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 \
+                  61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 \
+                  81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
+# Returns true if $(1) is a positive integer <= 100, otherwise returns nothing.
+define math_is_number
+$(strip \
+  $(if $(1),,$(error Argument missing)) \
+  $(if $(word 2,$(1)),$(error Multiple words in a single argument: $(1))) \
+  $(if $(filter $(1),$(__MATH_NUMBERS)),true))
+endef
+
+define _math_check_valid
+$(if $(call math_is_number,$(1)),,$(error Only positive integers <= 100 are supported (not $(1))))
+endef
+
+# Returns the greater of $1 or $2.
+# If $1 or $2 is not a positive integer <= 100, then an error is generated.
+define math_max
+$(strip $(call _math_check_valid,$(1)) $(call _math_check_valid,$(2)) \
+  $(lastword $(filter $(1) $(2),$(__MATH_NUMBERS))))
+endef
+
+define math_gt_or_eq
+$(if $(filter $(1),$(call math_max,$(1),$(2))),true)
+endef
+
+#$(warning $(call math_gt_or_eq, 2, 1))
+#$(warning $(call math_gt_or_eq, 1, 1))
+#$(warning $(if $(call math_gt_or_eq, 1, 2),false,true))
+
 ###########################################################
 ## Other includes
 ###########################################################