From 2838fd4a4e7fa40dd9cd95c81eb852190371ec5a Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Wed, 17 Apr 2024 10:18:31 -0400
Subject: build: Make the config scripts POSIX-compliant

---
 Makefile          |  2 +-
 config/cc.sh      |  2 +-
 config/pkg.sh     |  8 ++++----
 config/pkgconf.sh | 22 ++++++++++++----------
 4 files changed, 18 insertions(+), 16 deletions(-)

diff --git a/Makefile b/Makefile
index e9efef3..f42c59b 100644
--- a/Makefile
+++ b/Makefile
@@ -28,7 +28,7 @@ config::
 # Direct users to the new configuration system.
 asan lsan msan tsan ubsan gcov lint release::
 	@printf 'error: `%s %s` is no longer supported. ' "${MAKE}" $@ >&2
-	@printf 'Use `%s config %s=y` instead.\n' "${MAKE}" $$(echo $@ | tr '[a-z]' '[A-Z]') >&2
+	@printf 'Use `%s config %s=y` instead.\n' "${MAKE}" $$(echo $@ | tr 'a-z' 'A-Z') >&2
 	@false
 
 # Print an error if `make` is run before `make config`
diff --git a/config/cc.sh b/config/cc.sh
index abce508..e6883f5 100755
--- a/config/cc.sh
+++ b/config/cc.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 # Copyright © Tavian Barnes <tavianator@tavianator.com>
 # SPDX-License-Identifier: 0BSD
diff --git a/config/pkg.sh b/config/pkg.sh
index 2ca533e..4ebea64 100755
--- a/config/pkg.sh
+++ b/config/pkg.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 # Copyright © Tavian Barnes <tavianator@tavianator.com>
 # SPDX-License-Identifier: 0BSD
@@ -7,10 +7,10 @@
 
 set -eu
 
-NAME="${1^^}"
-declare -n XUSE="USE_$NAME"
+NAME=$(printf '%s' "$1" | tr 'a-z' 'A-Z')
+eval "XUSE=\"\${USE_$NAME:-}\""
 
-if [ "${XUSE:-}" ]; then
+if [ "$XUSE" ]; then
     USE="$XUSE"
 elif config/pkgconf.sh "$1"; then
     USE=y
diff --git a/config/pkgconf.sh b/config/pkgconf.sh
index 361852e..d6c45c7 100755
--- a/config/pkgconf.sh
+++ b/config/pkgconf.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 # Copyright © Tavian Barnes <tavianator@tavianator.com>
 # SPDX-License-Identifier: 0BSD
@@ -8,20 +8,22 @@
 set -eu
 
 MODE=
-if [[ "${1:-}" == --* ]]; then
-    MODE="$1"
-    shift
-fi
+case "${1:-}" in
+    --*)
+        MODE="$1"
+        shift
+esac
 
-if (($# < 1)); then
+if [ $# -lt 1 ]; then
     exit
 fi
 
-if [[ "$XNOLIBS" == [y1] ]]; then
-    exit 1
-fi
+case "$XNOLIBS" in
+    y|1)
+        exit 1
+esac
 
-if command -v "${XPKG_CONFIG:-}" &>/dev/null; then
+if command -v "${XPKG_CONFIG:-}" >/dev/null 2>&1; then
     case "$MODE" in
         "")
             "$XPKG_CONFIG" "$@"
-- 
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