Implement _pam_overwrite_n(n,x) for older systems

OSes based on older versions of the PAM development libraries lack
the _pam_overwrite_n(n,x) macro. This patch copies the Fedora 11
pam-devel-1.0.91-6 implementation into an SSSD private header.

This affects RHEL5 and SUSE10.

2 files changed, 31 insertions, 0 deletions

diff --git a/sss_client/pam_sss.c b/sss_client/pam_sss.c
index cf5c6a48..ccc205cc 100644
--- a/sss_client/pam_sss.c
+++ b/sss_client/pam_sss.c
@@ -14,6 +14,7 @@
 #include <security/pam_modules.h>
 #include <security/pam_misc.h>
 #include <security/pam_ext.h>
+#include "sss_pam_macros.h"
 
 #include "sss_cli.h"
 
diff --git a/sss_client/sss_pam_macros.h b/sss_client/sss_pam_macros.h
new file mode 100644
index 00000000..5277acd0
--- /dev/null
+++ b/sss_client/sss_pam_macros.h
@@ -0,0 +1,30 @@
+/*
+ * System Security Services Daemon. Client Interface for NSS and PAM.
+ *
+ * Copyright (C) Stephen Gallagher 2009
+ *
+ * You can used this header file in any way you see fit provided copyright
+ * notices are preserved.
+ *
+ */
+
+#ifndef _SSS_PAM_MACROS_H
+#define _SSS_PAM_MACROS_H
+
+/* Older versions of the pam development headers do not include the
+ * _pam_overwrite_n(n,x) macro. This implementation is copied from
+ * the Fedora 11 _pam_macros.h.
+ */
+#include <security/_pam_macros.h>
+#ifndef _pam_overwrite_n
+#define _pam_overwrite_n(x,n)   \
+do {                             \
+     register char *__xx__;      \
+     register unsigned int __i__ = 0;    \
+     if ((__xx__=(x)))           \
+        for (;__i__<n; __i__++) \
+            __xx__[__i__] = 0; \
+} while (0)
+#endif /* _pam_overwrite_n */
+
+#endif /* _SSS_PAM_MACROS_H */