From 7ef055e48c966fc1171cd60f3e9f34a18d47f91d Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Tue, 23 Apr 2019 12:59:54 -0400
Subject: set_substvar(): Sync with opkbuild

---
diff --git a/src/substvars.sh b/src/substvars.sh
index 60d1402..36ec308 100644
--- a/src/substvars.sh
+++ b/src/substvars.sh
@@ -1,6 +1,6 @@
 # Functions for setting and substituting variables
 #
-# Copyright (C) 2012, 2014  Patrick "P. J." McDermott
+# Copyright (C) 2012, 2014, 2019  Patrick McDermott
 #
 # This file is part of the ProteanOS Development Kit.
 #
@@ -19,36 +19,33 @@
 # <http://www.gnu.org/licenses/>.
 
 SUBSTVARS_MAX_DEPTH=50
+SUBSTVAR_TRIM_SED='
+	H;             # Store each input line in the hold space.
+	${             # At the last line of input:
+	  g;           # restore the hold space into the pattern space,
+	  s/^[\n]*//;  # remove leading newline characters,
+	  s/[\n]*$//;  # remove trailing newline characters, and
+	  p;           # print the results.
+	};
+'
 
 set_substvar()
 {
 	local name="${1}"
 	local value="${2}"
 
-	# Convert variable name to lower case and validate.
-	name="$(printf '%s\n' "${name}" | tr 'A-Z-' 'a-z_')"
-	case "${name:- }" in
-		*[!a-z0-9_]*)
-			warn "$(get_msg 'substvar_invalid')" "${name}"
-			return 1
-			;;
+	# Validate variable name and convert to lower case.
+	case "${name}" in *[!A-Za-z0-9-]* | '')
+		warn "$(get_msg 'substvar_invalid')" "${name}"
+		return 1
+		;;
 	esac
+	name="$(printf '%s' "${name}" | tr 'A-Z-' 'a-z_')"
 
-	# Trim leading and trailing newline characters from value.
-	value="$(printf '%s\n' "${value}" | sed -n '
-		H;            # Store each input line in the hold space.
-		${            # At the last line of input:
-		  g;          # Restore the hold space into the pattern space.
-		  s/^[\n]*//; # Remove leading newline characters.
-		  s/[\n]*$//; # Remove trailing newline characters.
-		  p;          # Print the results.
-		};
-		')"
-
-	# Escape single quotes in value.
-	value="$(printf '%s\n' "${value}" | sed "s/'/'\\\\''/g")"
+	# Trim leading and trailing whitespace from value.
+	value="$(printf '%s' "${value}" | sed -n "${SUBSTVAR_TRIM_SED}")"
 
-	eval "substvar_${name}='${value}'"
+	eval "substvar_${name}=\"\${value}\""
 
 	return 0
 }
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