1 files changed, 31 insertions, 0 deletions
diff --git a/libpam_misc/xstrdup.c b/libpam_misc/xstrdup.c
new file mode 100644
index 00000000..6a4ca6f7
--- /dev/null
+++ b/libpam_misc/xstrdup.c
@@ -0,0 +1,31 @@
+/* $Id$ */
+
+#include <malloc.h>
+#include <string.h>
+#include <security/pam_misc.h>
+
+/*
+ * Safe duplication of character strings. "Paranoid"; don't leave
+ * evidence of old token around for later stack analysis.
+ */
+
+char *xstrdup(const char *x)
+{
+     register char *new=NULL;
+
+     if (x != NULL) {
+	  register int i;
+
+	  for (i=0; x[i]; ++i);                       /* length of string */
+	  if ((new = malloc(++i)) == NULL) {
+	       i = 0;
+	  } else {
+	       while (i-- > 0) {
+		    new[i] = x[i];
+	       }
+	  }
+	  x = NULL;
+     }
+
+     return new;                 /* return the duplicate or NULL on error */
+}