simplify initialising variables in shell scripts

Signed-off-by: Leah Rowe <leah@libreboot.org>

include/blobutil.sh

@@ -4,7 +4,6 @@
 _ua="Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0"
 
 _7ztest="a"
-_b=""
 blobdir="blobs"
 appdir="${blobdir}/app"
 cbdir="coreboot/default"
@@ -12,7 +11,6 @@ cbcfgsdir="config/coreboot"
 ifdtool="cbutils/default/ifdtool"
 cbfstool="cbutils/default/cbfstool"
 nvmutil="util/nvmutil/nvm"
-boarddir=""
 pciromsdir="pciroms"
 
 mecleaner="$(pwd)/me_cleaner/me_cleaner.py"
@@ -22,28 +20,18 @@ kbc1126_ec_dump="$(pwd)/${cbdir}/util/kbc1126/kbc1126_ec_dump"
 pfs_extract="$(pwd)/biosutilities/Dell_PFS_Extract.py"
 uefiextract="$(pwd)/uefitool/uefiextract"
 
-setvars="EC_url=\"\""
-for x in EC_url_bkup EC_hash DL_hash DL_url DL_url_bkup E6400_VGA_DL_hash \
-    E6400_VGA_DL_url E6400_VGA_DL_url_bkup E6400_VGA_offset E6400_VGA_romname \
-    SCH5545EC_DL_url SCH5545EC_DL_url_bkup SCH5545EC_DL_hash MRC_url \
-    MRC_url_bkup MRC_hash MRC_board _dest; do
-	setvars="${setvars}; ${x}=\"\""
-done
+eval "$(setvars "" EC_url EC_url_bkup EC_hash DL_hash DL_url DL_url_bkup _dest \
+    E6400_VGA_DL_hash E6400_VGA_DL_url E6400_VGA_DL_url_bkup E6400_VGA_offset \
+    E6400_VGA_romname SCH5545EC_DL_url SCH5545EC_DL_url_bkup SCH5545EC_DL_hash \
+    MRC_url MRC_url_bkup MRC_hash MRC_board archive rom board modifygbe _dl \
+    new_mac release releasearchive _b boarddir)"
 
-for x in archive rom board modifygbe new_mac release releasearchive _dl; do
-	setvars="${setvars}; ${x}=\"\""
-done
-
-for x in CONFIG_BOARD_DELL_E6400 CONFIG_HAVE_MRC CONFIG_HAVE_ME_BIN \
+eval "$(setvars "" CONFIG_BOARD_DELL_E6400 CONFIG_HAVE_MRC CONFIG_HAVE_ME_BIN \
     CONFIG_ME_BIN_PATH CONFIG_KBC1126_FIRMWARE CONFIG_KBC1126_FW1 \
     CONFIG_KBC1126_FW1_OFFSET CONFIG_KBC1126_FW2 CONFIG_KBC1126_FW2_OFFSET \
     CONFIG_VGA_BIOS_FILE CONFIG_VGA_BIOS_ID CONFIG_GBE_BIN_PATH \
     CONFIG_INCLUDE_SMSC_SCH5545_EC_FW CONFIG_SMSC_SCH5545_EC_FW_FILE \
-    CONFIG_IFD_BIN_PATH CONFIG_MRC_FILE; do
-	setvars="${setvars}; ${x}=\"\""
-done
-
-eval "${setvars}"
+    CONFIG_IFD_BIN_PATH CONFIG_MRC_FILE)"
 
 check_defconfig()
 {

include/err.sh

@@ -1,6 +1,18 @@
 # SPDX-License-Identifier: MIT
 # SPDX-FileCopyrightText: 2022, 2023 Leah Rowe <leah@libreboot.org>
 
+setvars()
+{
+	_setvars=""
+	[ $# -lt 2 ] && err "setvars: too few arguments"
+	val="${1}"
+	shift 1
+	for var in $@; do
+		_setvars="${var}=\"${val}\"; ${_setvars}"
+	done
+	printf "%s\n" "${_setvars% }"
+}
+
 err()
 {
 	printf "ERROR %s: %s\n" "${0}" "${1}" 1>&2