Add "md5" detection macro.

[dxcommon.git] / t / md5.sh

diff --git a/t/md5.sh b/t/md5.sh
new file mode 100755 (executable)
index 0000000..0f3395e
--- /dev/null
+++ b/t/md5.sh
@@ -0,0 +1,43 @@
+#!/bin/sh
+#
+# Copyright © 2021 Nick Bowler
+#
+# Fake md5sum-like program for testing the md5 detection macro.
+#
+# License WTFPL2: Do What The Fuck You Want To Public License, version 2.
+# This is free software: you are free to do what the fuck you want to.
+# There is NO WARRANTY, to the extent permitted by law.
+
+: "${MD5_NO_R=}"
+: "${MD5_HASH=d41d8cd98f00b204e9800998ecf8427e}"
+: "${MD5_DIRECTION=forward}"
+
+stdin=true
+
+print_hash () {
+  case $MD5_DIRECTION in
+  forward) printf '%s  %s\n' "$MD5_HASH" "$1" ;;
+  reverse) printf '%s = %s\n' "$1" "$MD5_HASH" ;;
+  *) printf 'invalid direction %s\n' "$MD5_DIRECTION" 1>&2; exit 1 ;;
+  esac
+}
+
+for arg
+do
+  case $arg in
+  -r)
+    test x"$MD5_NO_R" = x"" || exit
+    MD5_DIRECTION=forward
+    continue ;;
+  md5)
+    continue ;;
+  esac
+
+  stdin=false
+  print_hash $arg
+done
+
+if $stdin; then
+  cat >/dev/null
+  print_hash stdin
+fi