--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/regexpr.c	Mon Sep 05 16:31:35 2011 +0200
@@ -0,0 +1,90 @@
+/*
+ * Simple Regular Expression functions. Derived from Unix 7th Edition,
+ * /usr/src/cmd/expr.y
+ *
+ * Modified by Gunnar Ritter, Freiburg i. Br., Germany, January 2003.
+ *
+ * Copyright(C) Caldera International Inc. 2001-2002. All rights reserved.
+ *
+ * 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 and documentation 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.
+ *   All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed or owned by Caldera
+ *      International, Inc.
+ *   Neither the name of Caldera International, Inc. nor the names of
+ *    other contributors may be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
+ * INTERNATIONAL, INC. 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 CALDERA INTERNATIONAL, INC. 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.
+ */
+
+/*	Sccsid @(#)regexpr.c	1.8 (gritter) 10/13/04	*/
+
+#include	<stdlib.h>
+#include	"regexpr.h"
+
+int	regerrno, reglength;
+static int	circf;
+
+static char	*regexpr_compile(char *, char *, const char *, int);
+
+char *
+compile(const char *instring, char *ep, char *endbuf)
+{
+	char	*cp;
+	int	sz = 0;
+
+	if (ep == 0) {
+		for (cp = (char *)instring; *cp != '\0'; cp++)
+			if (*cp == '[')
+				sz += 32;
+		sz += 2 * (cp - instring) + 5;
+		if ((ep = malloc(sz)) == 0) {
+			regerrno = 11;
+			return 0;
+		}
+		endbuf = &ep[sz];
+		ep[1] = '\0';
+	}
+	if ((cp=regexpr_compile((char *)instring, &ep[1], endbuf, '\0')) == 0) {
+		if (sz)
+			free(ep);
+		return 0;
+	}
+	ep[0] = circf;
+	reglength = cp - ep;
+	return sz ? ep : cp;
+}
+
+#define	INIT			register char *sp = instring;
+#define	GETC()			(*sp++)
+#define	PEEKC()			(*sp)
+#define	UNGETC(c)		(--sp)
+#define	RETURN(c)		return (c);
+#define	ERROR(c)		{ regerrno = c; return 0; }
+
+#define	compile(a, b, c, d)	regexpr_compile(a, b, c, d)
+#define	regexp_h_static		static
+#define	REGEXP_H_STEP_INIT	circf = *p2++;
+#define	REGEXP_H_ADVANCE_INIT	circf = *ep++;
+
+#include	"regexp.h"