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diff --git a/asm/evalstr.h b/asm/evalstr.h
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+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 2018 The NASM Authors - All Rights Reserved
+ *   See the file AUTHORS included with the NASM distribution for
+ *   the specific copyright holders.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following
+ *   conditions are met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above
+ *     copyright notice, this list of conditions and the following
+ *     disclaimer in the documentation and/or other materials provided
+ *     with the distribution.
+ *
+ *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * Wrappers around stdscan() and evaluate() for computing expressions
+ * directly from strings.
+ */
+
+#ifndef NASM_EVALSTR_H
+#define NASM_EVALSTR_H
+
+#include "compiler.h"
+
+/*
+ * Evaluate a string, returning the offset component. The string pointer
+ * is advanced to the beginning of the first token following the
+ * end of the expression.
+ *
+ * If the "segment" and/or "wrt" pointers are NULL, then those
+ * components are explicitly forbidden and will throw an error.
+ */
+int64_t evaluate_str(char **str, bool crit, int32_t *segment, int32_t *wrt);
+
+/*
+ * Evaluate a size expression: a pure integer, but size specifiers like
+ * BYTE are treated like integer constants.
+ */
+int64_t evaluate_size(char **str, bool crit);
+
+#endif  /* NASM_EVALSTR_H */