1 files changed, 81 insertions, 0 deletions
diff --git a/devel/bmake/files/unit-tests/dollar.mk b/devel/bmake/files/unit-tests/dollar.mk
new file mode 100644
index 00000000000..faa8e622802
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+++ b/devel/bmake/files/unit-tests/dollar.mk
@@ -0,0 +1,81 @@
+# $NetBSD: dollar.mk,v 1.1.1.1 2020/05/24 05:35:53 nia Exp $
+#
+# Test the various places where a dollar character can appear and
+# see what happens.  There are lots of surprises here.
+#
+
+LIST=		plain 'single' "double" 'mix'"ed" back\ slashed
+WORD=		word
+
+DOLLAR1=	$
+DOLLAR2=	$$
+DOLLAR4=	$$$$
+
+X=		VAR_X
+DOLLAR_XY=	$$XY
+DOLLAR_AXY=	$$AXY
+
+H=	@header()	{ printf '\n%s\n\n' "$$*"; }; header
+T=	@testcase()	{ printf '%23s => <%s>\n' "$$@"; }; testcase
+C=	@comment()	{ printf '%s\n' "$$*"; }; comment
+
+# These variable values are not accessed.
+# The trailing dollar in the '1 dollar literal eol' test case accesses
+# the empty variable instead, which is always guaranteed to be empty.
+${:U }=			space-var-value
+${:U${.newline}}=	newline-var-value
+# But this one is accessed.
+${:U'}=			single-quote-var-value'
+
+all:
+	$H 'Printing dollar from literals and variables'
+
+	$C 'To survive the parser, a dollar character must be doubled.'
+	$T	'1 dollar literal'	'$'
+	$T	'1 dollar literal eol'	''$
+	$T	'2 dollar literal'	'$$'
+	$T	'4 dollar literal'	'$$$$'
+
+	$C 'Some hungry part of make eats all the dollars after a :U modifier.'
+	$T	'1 dollar default'	''${:U$:Q}
+	$T	'2 dollar default'	''${:U$$:Q}
+	$T	'4 dollar default'	''${:U$$$$:Q}
+
+	$C 'This works as expected.'
+	$T	'1 dollar variable'	''${DOLLAR1:Q}
+	$T	'2 dollar variable'	''${DOLLAR2:Q}
+	$T	'4 dollar variable'	''${DOLLAR4:Q}
+
+	$C 'Some hungry part of make eats all the dollars after a :U modifier.'
+	$T	'1 dollar var-default'	''${:U${DOLLAR1}:Q}
+	$T	'2 dollar var-default'	''${:U${DOLLAR2}:Q}
+	$T	'4 dollar var-default'	''${:U${DOLLAR4}:Q}
+
+	$H 'Dollar in :S pattern'
+
+	$T	'S,$$,word,'		''${DOLLAR_XY:S,$,word,:Q}
+	$T	'S,$$X,word,'		''${DOLLAR_XY:S,$X,word,:Q}
+	$T	'S,$$$$X,word,'		''${DOLLAR_XY:S,$$X,word,:Q}
+	$T	'S,$$$$$$X,word,'	''${DOLLAR_XY:S,$$$X,word,:Q}
+
+	$T	'S,$$X,replaced,'	''${X:S,$X,replaced,:Q}
+	$T	'S,$$$$X,replaced,'	''${X:S,$$X,replaced,:Q}
+	$T	'S,$$$$$$X,replaced,'	''${X:S,$$$X,replaced,:Q}
+
+	$H 'Dollar in :C character class'
+
+	$C 'The A is replaced because the $$$$ is reduced to a single $$,'
+	$C 'which is then resolved to the variable X with the value VAR_X.'
+	$C 'The effective character class becomes [VAR_XY].'
+	$T	'C,[$$$$XY],<&>,g'	''${DOLLAR_AXY:C,[$$XY],<&>,g:Q}
+
+	$H 'Dollar in :C pattern'
+	$C 'For some reason, multiple dollars are folded into one.'
+	$T	'C,$$,dollar,g'		''${DOLLAR:C,$,dollar,g:Q}
+	$T	'C,$$$$,dollar,g'	''${DOLLAR:C,$$,dollar,g:Q}
+
+	$H 'Dollar in :S replacement'
+	$C 'For some reason, multiple dollars are folded into one.'
+	$T	'S,word,a$$Xo,'		''${WORD:S,word,a$Xo,:Q}
+	$T	'S,word,a$$$$Xo,'	''${WORD:S,word,a$$Xo,:Q}
+	$T	'S,word,a$$$$$$Xo,'	''${WORD:S,word,a$$$Xo,:Q}