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diff --git a/libasn1compiler/asn1c_naming.h b/libasn1compiler/asn1c_naming.h
new file mode 100644
index 0000000..c2b94c9
--- /dev/null
+++ b/libasn1compiler/asn1c_naming.h
@@ -0,0 +1,47 @@
+#ifndef	ASN1_COMPILER_NAMING_H
+#define	ASN1_COMPILER_NAMING_H
+
+
+/*
+ * A member or a field name.
+ */
+struct c_names {
+    struct {
+        const char *asn_name;       /* "T-Rex" */
+        const char *part_name;      /* "T_Rex" */
+        const char *base_name;      /* "T_Rex" */
+        const char *c_name;         /* "T_Rex_t" */
+        const char *constrained_c_name; /* "long" */
+    } type;
+    const char *asn_name;      /* "foo" */
+    const char *part_name;     /* "foo", "signed" */
+    const char *base_name;     /* "foo" if not, "parent_foo" if compound */
+    const char *short_name;    /* "foo_t", "e_foo" */
+    const char *full_name;     /* "struct foo", "enum foo" */
+    const char *as_member;     /* "foo" (not compounded) */
+    const char *presence_enum; /* "enum foo_PR" */
+    const char *presence_name; /* "foo_PR" */
+    const char *members_enum;  /* "enum foo" */
+    const char *members_name;  /* "e_foo" */
+    const char *compound_name; /* always contain "parent_foo" */
+};
+
+struct c_names c_name(arg_t *);
+struct c_names c_expr_name(arg_t *, asn1p_expr_t *);
+const char *c_member_name(arg_t *, asn1p_expr_t *);     /* %s_%s */
+const char *c_presence_name(arg_t *, asn1p_expr_t *);   /* %s_PR_%s */
+
+const char *c_names_format(struct c_names); /* For debugging */
+
+/*
+ * Returns 0 if no C name clashes have been encountered.
+ * Returns 1 if C name clashes have been encountered.
+ * Prints out the clashing items and suggests -fcompound-names.
+ */
+int c_name_clash(arg_t *arg);
+
+void c_name_clash_finder_init(void);
+
+void c_name_clash_finder_destroy(void);
+
+#endif	/* ASN1_COMPILER_NAMING_H */