diff --git a/dasdblks.h b/dasdblks.h
index f386df473..1409ee068 100644
--- a/dasdblks.h
+++ b/dasdblks.h
@@ -386,5 +386,5 @@ int create_compressed_fba (char *fname, U16 devtype, U32 sectsz,
 int get_verbose_util(void);
 DUT_DLL_IMPORT void set_verbose_util(int v);
 
-
+DUT_DLL_IMPORT int valid_dsname( const char *pszdsname );
 #define DEFAULT_FBA_TYPE 0x3370
diff --git a/dasdls.c b/dasdls.c
index 4497c4fda..b94066875 100644
--- a/dasdls.c
+++ b/dasdls.c
@@ -51,15 +51,21 @@ int list_contents(CIFBLK *cif, char *volser, DSXTENT *extent)
 
         ptr = cif->trkbuf + CKDDASD_TRKHDR_SIZE;
 
-        while (!end_of_track(ptr)) {
+        while (!end_of_track(ptr)) 
+        {
             char dsname[45];
+
             CKDDASD_RECHDR *rechdr = (CKDDASD_RECHDR*)ptr;
             int kl = rechdr->klen;
             int dl = (rechdr->dlen[0] << 8) | rechdr->dlen[1];
+            
             make_asciiz(dsname, sizeof(dsname), ptr + CKDDASD_RECHDR_SIZE, kl);
-            /* XXXX Is this a suitable sanity check for a legal dsname? */
-            if (isalnum(*dsname))
-                    printf("%s\n", dsname);
+
+            dsname[44] = '\0';
+
+            if ( valid_dsname( dsname ) )
+                printf("%s\n", dsname);
+
             ptr += CKDDASD_RECHDR_SIZE + kl + dl;
         }
 
diff --git a/dasdutil.c b/dasdutil.c
index 48b6dab83..7abd71e79 100644
--- a/dasdutil.c
+++ b/dasdutil.c
@@ -2205,3 +2205,35 @@ DLL_EXPORT void set_verbose_util(int v)
 {
     verbose = v;
 }
+
+DLL_EXPORT int valid_dsname( const char *pszdsname )
+{
+    int i;
+    int iLen = (int)strlen(pszdsname);
+
+    if ( iLen > 44 || iLen == 0 ) return FALSE;
+
+    for ( i = 0; i < iLen; i++ )
+    {
+        BYTE c = pszdsname[i];
+        if ( isalnum( c ) ) 
+            continue;
+        else if ( c == '$' )
+            continue;
+        else if ( c == '@' )
+            continue;
+        else if ( c == '#' )
+            continue;
+        else if ( c == '-' )
+            continue;
+        else if ( c == '.' )
+            continue;
+        else if ( c == '{' )
+            continue;
+        else if ( i > 1 && c == '\0' )
+            break;
+        else
+            return FALSE;
+    }
+    return TRUE;
+}