hygiene: shell escape $awk and $prepro.

Since $awk and $prepro are now controlled via command line
options, and are being fed to eval, we should shell escape
them.  Two of our test cases rely on the loose interpolation
behavior; we fix those using proper external mock programs
testawk and testcpp.

1 files changed, 3 insertions, 0 deletions

diff --git a/testawk b/testawk
new file mode 100755
index 0000000..a41b4b6
--- /dev/null
+++ b/testawk
@@ -0,0 +1,3 @@
+#!/bin/sh
+printf "[%.2s]" "$@"
+printf "\n"