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, 14 insertions, 0 deletions

diff --git a/testdir/safearg.cwk b/testdir/safearg.cwk
new file mode 100644
index 0000000..4f29b9f
--- /dev/null
+++ b/testdir/safearg.cwk
@@ -0,0 +1,14 @@
+#include <safearg.h>
+
+END {
+  for (x in ARGV) {
+    if (x != 0)
+      printf("ARGV[%s]=%s\n", x, ARGV[x])
+  }
+  for (x in argv) {
+    if (x != 0)
+      printf("argv[%s]=%s\n", x, argv[x])
+  }
+  printf("a=%s\n", a)
+  printf("b=%s\n", a)
+}