1 files changed, 31 insertions, 0 deletions

diff --git a/libbb/wfopen_input.c b/libbb/wfopen_input.c
new file mode 100644
index 000000000..3da855fe6
--- /dev/null
+++ b/libbb/wfopen_input.c
@@ -0,0 +1,31 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * wfopen_input implementation for busybox
+ *
+ * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+/* 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 main stdin (for 'cmp' at least).
+ */
+
+#include "libbb.h"
+
+FILE *fopen_or_warn_stdin(const char *filename)
+{
+        FILE *fp = stdin;
+
+        if (filename != bb_msg_standard_input
+         && filename[0]
+         && (filename[0] != '-' || filename[1])
+        ) {
+                fp = fopen_or_warn(filename, "r");
+        }
+
+        return fp;
+}