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diff --git a/include/libaccess/usi.h b/include/libaccess/usi.h
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+++ b/include/libaccess/usi.h
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+/** BEGIN COPYRIGHT BLOCK
+ * Copyright 2001 Sun Microsystems, Inc.
+ * Portions copyright 1999, 2001-2003 Netscape Communications Corporation.
+ * All rights reserved.
+ * END COPYRIGHT BLOCK **/
+#ifndef __usi_h
+#define __usi_h
+
+/*
+ * Description (usi.h)
+ *
+ *	This file defines the interface to an unsigned integer datatype.
+ *	Unsigned integers are used to represent object identifiers of
+ *	various sorts, including user ids and group ids.  Functions
+ *	for manipulating lists of USIs are also provided in this
+ *	interface.
+ */
+
+/* Define a type to contain an unsigned integer value */
+typedef unsigned int USI_t;
+
+/* Define a type to describe a list of USI_t values */
+typedef struct USIList_s USIList_t;
+struct USIList_s {
+    int uil_count;		/* number of active values in list */
+    int uil_size;		/* current size of list area in USI_t */
+    USI_t * uil_list;		/* pointer to array of values */
+};
+
+/* Define macro to initialize a USIList_t structure */
+#define UILINIT(uilptr) \
+	{ \
+	    (uilptr)->uil_count = 0; \
+	    (uilptr)->uil_size = 0; \
+	    (uilptr)->uil_list = 0; \
+	}
+
+/* Define a macro to replace the contents of one USIList_t with another's */
+#define UILREPLACE(dst, src) \
+	{ \
+	    if ((dst)->uil_size > 0) { \
+		FREE((dst)->uil_list); \
+	    } \
+	    (dst)->uil_count = (src)->uil_count; \
+	    (dst)->uil_size = (src)->uil_size; \
+	    (dst)->uil_list = (src)->uil_list; \
+	    (src)->uil_count = 0; \
+	    (src)->uil_size = 0; \
+	    (src)->uil_list = 0; \
+	}
+
+/* Define a variation of UILINIT() that frees any allocated space */
+#define UILFREE(uilptr) \
+	{ \
+	    if ((uilptr)->uil_size > 0) { \
+		FREE((uilptr)->uil_list); \
+	    } \
+	    (uilptr)->uil_count = 0; \
+	    (uilptr)->uil_size = 0; \
+	    (uilptr)->uil_list = 0; \
+	}
+
+/* Define a macro to extract the current number of items in a USIList_t */
+#define UILCOUNT(uilptr) ((uilptr)->uil_count)
+
+/* Define a macro to return a pointer to the array of values */
+#define UILLIST(uilptr) ((uilptr)->uil_list)
+
+NSPR_BEGIN_EXTERN_C
+
+/* Define functions in usi.c */
+extern USI_t * usiAlloc(USIList_t * uilptr, int count);
+extern int usiInsert(USIList_t * uilptr, USI_t usi);
+extern int usiPresent(USIList_t * uilptr, USI_t usi);
+extern int usiRemove(USIList_t * uilptr, USI_t usi);
+extern int uilDuplicate(USIList_t * dstptr, USIList_t * srcptr);
+extern int uilMerge(USIList_t * dstptr, USIList_t * srcptr);
+
+NSPR_END_EXTERN_C
+
+#endif /* __usi_h */