78 lines
2.7 KiB
Makefile
78 lines
2.7 KiB
Makefile
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#
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# Copyright (C) 2017 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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###########################################################
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# Basic math functions for positive integers <= 100
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#
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# (SDK versions for example)
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###########################################################
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__MATH_NUMBERS := 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 \
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21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 \
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41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 \
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61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 \
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81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
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# Returns true if $(1) is a positive integer <= 100, otherwise returns nothing.
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define math_is_number
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$(strip \
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$(if $(1),,$(error Argument missing)) \
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$(if $(word 2,$(1)),$(error Multiple words in a single argument: $(1))) \
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$(if $(filter $(1),$(__MATH_NUMBERS)),true))
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endef
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#$(warning true == $(call math_is_number,2))
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#$(warning == $(call math_is_number,foo))
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#$(call math_is_number,1 2)
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#$(call math_is_number,no 2)
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define _math_check_valid
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$(if $(call math_is_number,$(1)),,$(error Only positive integers <= 100 are supported (not $(1))))
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endef
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#$(call _math_check_valid,0)
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#$(call _math_check_valid,1)
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#$(call _math_check_valid,100)
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#$(call _math_check_valid,101)
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#$(call _math_check_valid,)
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#$(call _math_check_valid,1 2)
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# Returns the greater of $1 or $2.
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# If $1 or $2 is not a positive integer <= 100, then an error is generated.
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define math_max
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$(strip $(call _math_check_valid,$(1)) $(call _math_check_valid,$(2)) \
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$(lastword $(filter $(1) $(2),$(__MATH_NUMBERS))))
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endef
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#$(call math_max)
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#$(call math_max,1)
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#$(call math_max,1 2,3)
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#$(warning 1 == $(call math_max,1,1))
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#$(warning 42 == $(call math_max,5,42))
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#$(warning 42 == $(call math_max,42,5))
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define math_gt_or_eq
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$(if $(filter $(1),$(call math_max,$(1),$(2))),true)
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endef
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#$(warning $(call math_gt_or_eq, 2, 1))
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#$(warning $(call math_gt_or_eq, 1, 1))
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#$(warning $(if $(call math_gt_or_eq, 1, 2),false,true))
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# $1 is the variable name to increment
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define inc_and_print
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$(strip $(eval $(1) := $($(1)) .)$(words $($(1))))
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endef
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