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diff --git a/src/tokenizer.h b/src/tokenizer.h
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+/***********************************************************
+Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The
+Netherlands.
+
+ All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the names of Stichting Mathematisch
+Centrum or CWI not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior permission.
+
+STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
+THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
+FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+******************************************************************/
+
+/* Tokenizer interface */
+
+#include "token.h" /* For token types */
+
+#define MAXINDENT 100 /* Max indentation level */
+
+/* Tokenizer state */
+struct tok_state {
+ /* Input state; buf <= cur <= inp <= end */
+ /* NB an entire token must fit in the buffer */
+ char *buf; /* Input buffer */
+ char *cur; /* Next character in buffer */
+ char *inp; /* End of data in buffer */
+ char *end; /* End of input buffer */
+ int done; /* 0 normally, 1 at EOF, -1 after error */
+ FILE *fp; /* Rest of input; NULL if tokenizing a string */
+ int tabsize; /* Tab spacing */
+ int indent; /* Current indentation index */
+ int indstack[MAXINDENT]; /* Stack of indents */
+ int atbol; /* Nonzero if at begin of new line */
+ int pendin; /* Pending indents (if > 0) or dedents (if < 0) */
+ char *prompt, *nextprompt; /* For interactive prompting */
+ int lineno; /* Current line number */
+};
+
+extern struct tok_state *tok_setups PROTO((char *));
+extern struct tok_state *tok_setupf PROTO((FILE *, char *ps1, char *ps2));
+extern void tok_free PROTO((struct tok_state *));
+extern int tok_get PROTO((struct tok_state *, char **, char **));