3 files changed, 29 insertions, 8 deletions
diff --git a/libbb/fclose_nonstdin.c b/libbb/fclose_nonstdin.c
index 88e8474f2..768ee946d 100644
--- a/libbb/fclose_nonstdin.c
+++ b/libbb/fclose_nonstdin.c
@@ -16,8 +16,10 @@
 
 int fclose_if_not_stdin(FILE *f)
 {
-	if (f != stdin) {
-		return fclose(f);
-	}
-	return 0;
+	/* Some more paranoid applets want ferror() check too */
+	int r = ferror(f); /* NB: does NOT set errno! */
+	if (r) errno = EIO; /* so we'll help it */
+	if (f != stdin)
+		return (r | fclose(f)); /* fclose does set errno on error */
+	return r;
 }
diff --git a/libbb/getopt32.c b/libbb/getopt32.c
index f48ccaa6a..9e53dfd08 100644
--- a/libbb/getopt32.c
+++ b/libbb/getopt32.c
@@ -281,6 +281,8 @@ Special characters:
 
 /* Code here assumes that 'unsigned' is at least 32 bits wide */
 
+const char *const bb_argv_dash[] = { "-", NULL };
+
 const char *opt_complementary;
 
 enum {
diff --git a/libbb/wfopen_input.c b/libbb/wfopen_input.c
index 1b4928e1f..a7c1c32f5 100644
--- a/libbb/wfopen_input.c
+++ b/libbb/wfopen_input.c
@@ -10,8 +10,6 @@
 /* A number of applets need to open a file for reading, where the filename
  * is a command line arg.  Since often that arg is '-' (meaning stdin),
  * we avoid testing everywhere by consolidating things in this routine.
- *
- * Note: we also consider "" to mean stdin (for 'cmp' at least).
  */
 
 #include "libbb.h"
@@ -21,11 +19,30 @@ FILE *fopen_or_warn_stdin(const char *filename)
 	FILE *fp = stdin;
 
 	if (filename != bb_msg_standard_input
-	 && filename[0]
 	 && NOT_LONE_DASH(filename)
 	) {
 		fp = fopen_or_warn(filename, "r");
 	}
-
 	return fp;
 }
+
+FILE *xfopen_stdin(const char *filename)
+{
+	FILE *fp = fopen_or_warn_stdin(filename);
+	if (fp)
+		return fp;
+	xfunc_die();	/* We already output an error message. */
+}
+
+int open_or_warn_stdin(const char *filename)
+{
+	int fd = STDIN_FILENO;
+
+	if (filename != bb_msg_standard_input
+	 && NOT_LONE_DASH(filename)
+	) {
+		fd = open_or_warn(filename, O_RDONLY);
+	}
+
+	return fd;
+}