added (unsiged) cast to avoid int overflow

removed REGEX directive

bin/ed/Makefile

@@ -1,5 +1,5 @@
 PROG=	ed
-CFLAGS+=-DVI_BANG -DGNU_REGEX
+CFLAGS+=-DVI_BANG
 SRCS=	ed.c re.c buf.c cbc.c 
 LINKS=	${BINDIR}/ed ${BINDIR}/red
 MLINKS=	ed.1 red.1

bin/ed/README

@@ -7,7 +7,6 @@ compile with little trouble.  Otherwise, the macros spl1() and spl0()
 should be redefined to disable interrupts.
 
 The following compiler directives are recognized:
-GNU_REGEX	- use with GNU regex(3)
 DES		- use to add encryption support (requires crypt(3))
 NO_REALLOC_NULL	- use if realloc(3) does not accept a NULL pointer
 BACKWARDS	- use for backwards compatibility

bin/ed/ed.h

@@ -49,7 +49,7 @@
 #define BITS(type)  (BITSPERBYTE * (int)sizeof(type))
 #define CHARBITS    BITS(char)
 #define INTBITS     BITS(int)
-#define INTHIBIT    (1 << (INTBITS - 1))
+#define INTHIBIT    (unsigned) (1 << (INTBITS - 1))
 
 #define ERR		(-2)
 #define EMOD		(-3)

bin/ed/re.c

@@ -84,13 +84,6 @@ optpat()
 		return NULL;
 	}
 	patlock = 0;
-#ifdef GNU_REGEX
-	/* initialize pattern buffer */
-	exp->buffer = NULL;
-	exp->allocated = 0L;
-	exp->fastmap = 0;		/* not used by GNU regex after 0.12 */
-	exp->translate = 0;
-#endif
 	if (n = regcomp(exp, exps, 0)) {
 		regerror(n, exp, errmsg, sizeof errmsg);
 		return NULL;