From 150083eea622e2ea31a3202426c0df9b4dfd16f3 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Tue, 23 Apr 2019 22:05:03 -0400
Subject: parse_control(): Rewrite field checking

Get rid of the printf and grep pipeline and use a case construct instead
of a "[" command with a "${parameter%word}" expansion.

Also drop the unused check_fields variable, just added in commit
1e585cb.
---
diff --git a/src/control.sh b/src/control.sh
index 6a92ff3..e73c842 100644
--- a/src/control.sh
+++ b/src/control.sh
@@ -43,7 +43,6 @@ parse_control()
 	local field_cb="${2}"
 	local paragraph_cb="${3}"
 	shift 3
-	local check_fields=
 	local req_fields=
 	local line_nr=
 	local in_paragraph=
@@ -53,11 +52,9 @@ parse_control()
 	local name=
 	local value=
 
-	check_fields='false'
 	if [ ${#} -eq 1 ]; then
-		req_fields="${1}"
+		req_fields=" ${1} "
 		shift 1
-		check_fields='true'
 	fi
 
 	line_nr=0
@@ -93,8 +90,8 @@ parse_control()
 							"${para_req_fields}"
 					fi
 				fi
-				para_req_fields="$(printf '%s\n' ${req_fields})"
-				got_fields="${LF}"
+				para_req_fields="${req_fields}"
+				got_fields=' '
 				name=''
 				value=''
 				;;
@@ -117,23 +114,23 @@ parse_control()
 						"${line_nr}" 'control_bad_nv'
 					continue
 				fi
-				if [ -n "${para_req_fields}" ]; then
-					# Remove field from list of required
-					# fields.
-					para_req_fields="$(printf '%s' \
-						"${para_req_fields}" | \
-						grep -Fv "${name}")"
-				fi
-				if [ "x${got_fields%${LF}${name}${LF}*}" != \
-						"x${got_fields}" ]; then
+				case "${got_fields}" in *" ${name} "*)
 					# Duplicate field.
-					_parse_control_error \
+					_ob_parse_control_error \
 						"${file}" "${line_nr}" \
 						'control_duplicate_field' \
 						"${name}"
-				else
-					got_fields="${got_fields}${name}${LF}"
-				fi
+					continue
+				esac
+				got_fields="${got_fields}${name} "
+				case "${para_req_fields}" in *" ${name} "*)
+					# Required field: remove from list.
+					para_req_fields="$(:\
+						)${para_req_fields% ${name} *}$(
+						:\
+						) ${para_req_fields#* ${name} }"
+					continue
+				esac
 				;;
 			' '*)  # Continuation line.
 				in_paragraph='true'
--
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