1 files changed, 13 insertions, 4 deletions

diff --git a/shell/shell_common.c b/shell/shell_common.c
index 99bb91c6f..669a18dfd 100644
--- a/shell/shell_common.c
+++ b/shell/shell_common.c
@@ -19,8 +19,17 @@
 #include "libbb.h"
 #include "shell_common.h"
 
-#if IFS_BROKEN
 const char defifsvar[] ALIGN1 = "IFS= \t\n";
-#else
-const char defifs[] ALIGN1 = " \t\n";
-#endif
+
+
+int FAST_FUNC is_well_formed_var_name(const char *s, char terminator)
+{
+        if (!s || !(isalpha(*s) || *s == '_'))
+                return 0;
+
+        do
+                s++;
+        while (isalnum(*s) || *s == '_');
+
+        return *s == terminator;
+}