Implement -E option and <safearg.h> header.

The -E option is not passed through to the Awk implementation
any more, which is not particularly useful, because the option
resembles -f, and its argument requires likewise handling.

We achieve the semantics that -E <name> is equivalent to
-f <name> --.

From the GNU Awk user's perspective, this is a regression
in the semantics of -E which also has the effect of suppressing
the processing of arguments which look like variable assignments.
To make up for that, we provide the <safearg.h> header which
suppresses all implicit treatment of the remaining arguments.

1 files changed, 8 insertions, 3 deletions

diff --git a/bin/cppawk b/bin/cppawk
index bb58c78..c35b4fd 100755
--- a/bin/cppawk
+++ b/bin/cppawk
@@ -150,10 +150,15 @@ while [ $# -gt 0 ] ; do
   -U* | -D* | -I* | -iquote* )
     prepro_opts="$prepro_opts $(quote "$1")"
     ;;
-  -f )
-    [ $# -gt 1 ] || die "-f requires argument"
-    [ -z "$awk_file" ] || die "-f can be only given once"
+  -f | -E )
+    [ $# -gt 1 ] || die "%s requires argument" $1
+    [ -z "$awk_file" ] || die "%s can be only given once" $1
     awk_file=$2
+    if [ $1 = -E ] ; then
+      shift
+      shift
+      break
+    fi
     shift
     ;;
   -F | -v | -E | -i | -l | -L )