Add support for -- argument termination marker

This allows one to have executables starting with -; another side-effect
of this patch is that in case dtach is used in a script where we can't
trust the user input, now the user is not able to inject new options
that are interpreted by dtach; (for example it is used like dtach -c
socket -- ${@}

(cherry picked from commit ff35a7e791225f8d28a27033658070bbb4caa5ff)

1 files changed, 5 insertions, 0 deletions

diff --git a/main.c b/main.c
index 9fe78b8..89e22ce 100644
--- a/main.c
+++ b/main.c
@@ -152,6 +152,11 @@ main(int argc, char **argv)
 	{
 		char *p;
 
+		if (strcmp(argv[0], "--") == 0) {
+			++argv; --argc;
+			break;
+		}
+
 		for (p = argv[0] + 1; *p; ++p)
 		{
 			if (*p == 'E')