X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/38d679fdb55d39e08b90cc703a44ef72273abdb3..c72b1ad70a0dda5a3fe5086e0c80ae12402e405d:/src/regex/regc_lex.c

diff --git a/src/regex/regc_lex.c b/src/regex/regc_lex.c
index a24290d1a1..1acc3f4cae 100644
--- a/src/regex/regc_lex.c
+++ b/src/regex/regc_lex.c
@@ -2,21 +2,21 @@
  * lexical analyzer
  * This file is #included by regcomp.c.
  *
- * Copyright (c) 1998, 1999 Henry Spencer.	All rights reserved.
- *
+ * Copyright (c) 1998, 1999 Henry Spencer.  All rights reserved.
+ * 
  * Development of this software was funded, in part, by Cray Research Inc.,
  * UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics
  * Corporation, none of whom are responsible for the results.  The author
- * thanks all of them.
- *
+ * thanks all of them. 
+ * 
  * Redistribution and use in source and binary forms -- with or without
  * modification -- are permitted for any purpose, provided that
  * redistributions in source form retain this entire copyright notice and
  * indicate the origin and nature of any modifications.
- *
+ * 
  * I'd appreciate being given credit for this package in the documentation
  * of software which uses it, but that is not a requirement.
- *
+ * 
  * THIS SOFTWARE IS PROVIDED ``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
@@ -28,183 +28,177 @@
  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- * $Header$
- *
  */
 
 /* scanning macros (know about v) */
-#define ATEOS()		(v->now >= v->stop)
-#define HAVE(n)		(v->stop - v->now >= (n))
-#define NEXT1(c)	(!ATEOS() && *v->now == CHR(c))
-#define NEXT2(a,b)	(HAVE(2) && *v->now == CHR(a) && *(v->now+1) == CHR(b))
-#define NEXT3(a,b,c)	(HAVE(3) && *v->now == CHR(a) && \
+#define	ATEOS()		(v->now >= v->stop)
+#define	HAVE(n)		(v->stop - v->now >= (n))
+#define	NEXT1(c)	(!ATEOS() && *v->now == CHR(c))
+#define	NEXT2(a,b)	(HAVE(2) && *v->now == CHR(a) && *(v->now+1) == CHR(b))
+#define	NEXT3(a,b,c)	(HAVE(3) && *v->now == CHR(a) && \
 						*(v->now+1) == CHR(b) && \
 						*(v->now+2) == CHR(c))
-#define SET(c)		(v->nexttype = (c))
-#define SETV(c, n)	(v->nexttype = (c), v->nextvalue = (n))
-#define RET(c)		return (SET(c), 1)
-#define RETV(c, n)	return (SETV(c, n), 1)
-#define FAILW(e)	return (ERR(e), 0)	/* ERR does SET(EOS) */
-#define LASTTYPE(t) (v->lasttype == (t))
+#define	SET(c)		(v->nexttype = (c))
+#define	SETV(c, n)	(v->nexttype = (c), v->nextvalue = (n))
+#define	RET(c)		return (SET(c), 1)
+#define	RETV(c, n)	return (SETV(c, n), 1)
+#define	FAILW(e)	return (ERR(e), 0)	/* ERR does SET(EOS) */
+#define	LASTTYPE(t)	(v->lasttype == (t))
 
 /* lexical contexts */
-#define L_ERE	1				/* mainline ERE/ARE */
-#define L_BRE	2				/* mainline BRE */
-#define L_Q 3					/* REG_QUOTE */
-#define L_EBND	4				/* ERE/ARE bound */
-#define L_BBND	5				/* BRE bound */
-#define L_BRACK 6				/* brackets */
-#define L_CEL	7				/* collating element */
-#define L_ECL	8				/* equivalence class */
-#define L_CCL	9				/* character class */
-#define INTOCON(c)	(v->lexcon = (c))
-#define INCON(con)	(v->lexcon == (con))
+#define	L_ERE	1	/* mainline ERE/ARE */
+#define	L_BRE	2	/* mainline BRE */
+#define	L_Q	3	/* REG_QUOTE */
+#define	L_EBND	4	/* ERE/ARE bound */
+#define	L_BBND	5	/* BRE bound */
+#define	L_BRACK	6	/* brackets */
+#define	L_CEL	7	/* collating element */
+#define	L_ECL	8	/* equivalence class */
+#define	L_CCL	9	/* character class */
+#define	INTOCON(c)	(v->lexcon = (c))
+#define	INCON(con)	(v->lexcon == (con))
 
 /* construct pointer past end of chr array */
-#define ENDOF(array)	((array) + sizeof(array)/sizeof(chr))
+#define	ENDOF(array)	((array) + sizeof(array)/sizeof(chr))
 
 /*
- * lexstart - set up lexical stuff, scan leading options
+ - lexstart - set up lexical stuff, scan leading options
+ ^ static VOID lexstart(struct vars *);
  */
-static void
-lexstart(struct vars * v)
+static VOID
+lexstart(v)
+struct vars *v;
 {
-	prefixes(v);				/* may turn on new type bits etc. */
+	prefixes(v);			/* may turn on new type bits etc. */
 	NOERR();
 
-	if (v->cflags & REG_QUOTE)
-	{
-		assert(!(v->cflags & (REG_ADVANCED | REG_EXPANDED | REG_NEWLINE)));
+	if (v->cflags&REG_QUOTE) {
+		assert(!(v->cflags&(REG_ADVANCED|REG_EXPANDED|REG_NEWLINE)));
 		INTOCON(L_Q);
-	}
-	else if (v->cflags & REG_EXTENDED)
-	{
-		assert(!(v->cflags & REG_QUOTE));
+	} else if (v->cflags&REG_EXTENDED) {
+		assert(!(v->cflags&REG_QUOTE));
 		INTOCON(L_ERE);
-	}
-	else
-	{
-		assert(!(v->cflags & (REG_QUOTE | REG_ADVF)));
+	} else {
+		assert(!(v->cflags&(REG_QUOTE|REG_ADVF)));
 		INTOCON(L_BRE);
 	}
 
 	v->nexttype = EMPTY;		/* remember we were at the start */
-	next(v);					/* set up the first token */
+	next(v);			/* set up the first token */
 }
 
 /*
- * prefixes - implement various special prefixes
+ - prefixes - implement various special prefixes
+ ^ static VOID prefixes(struct vars *);
  */
-static void
-prefixes(struct vars * v)
+static VOID
+prefixes(v)
+struct vars *v;
 {
 	/* literal string doesn't get any of this stuff */
-	if (v->cflags & REG_QUOTE)
+	if (v->cflags&REG_QUOTE)
 		return;
 
-	/* initial "***" gets special things */
+	/* initial "***" gets special things */	
 	if (HAVE(4) && NEXT3('*', '*', '*'))
-		switch (*(v->now + 3))
-		{
-			case CHR('?'):		/* "***?" error, msg shows version */
-				ERR(REG_BADPAT);
-				return;			/* proceed no further */
-				break;
-			case CHR('='):		/* "***=" shifts to literal string */
-				NOTE(REG_UNONPOSIX);
-				v->cflags |= REG_QUOTE;
-				v->cflags &= ~(REG_ADVANCED | REG_EXPANDED | REG_NEWLINE);
-				v->now += 4;
-				return;			/* and there can be no more prefixes */
-				break;
-			case CHR(':'):		/* "***:" shifts to AREs */
-				NOTE(REG_UNONPOSIX);
-				v->cflags |= REG_ADVANCED;
-				v->now += 4;
-				break;
-			default:			/* otherwise *** is just an error */
-				ERR(REG_BADRPT);
-				return;
-				break;
+		switch (*(v->now + 3)) {
+		case CHR('?'):		/* "***?" error, msg shows version */
+			ERR(REG_BADPAT);
+			return;		/* proceed no further */
+			break;
+		case CHR('='):		/* "***=" shifts to literal string */
+			NOTE(REG_UNONPOSIX);
+			v->cflags |= REG_QUOTE;
+			v->cflags &= ~(REG_ADVANCED|REG_EXPANDED|REG_NEWLINE);
+			v->now += 4;
+			return;		/* and there can be no more prefixes */
+			break;
+		case CHR(':'):		/* "***:" shifts to AREs */
+			NOTE(REG_UNONPOSIX);
+			v->cflags |= REG_ADVANCED;
+			v->now += 4;
+			break;
+		default:		/* otherwise *** is just an error */
+			ERR(REG_BADRPT);
+			return;
+			break;
 		}
 
 	/* BREs and EREs don't get embedded options */
-	if ((v->cflags & REG_ADVANCED) != REG_ADVANCED)
+	if ((v->cflags&REG_ADVANCED) != REG_ADVANCED)
 		return;
 
 	/* embedded options (AREs only) */
-	if (HAVE(3) && NEXT2('(', '?') && iscalpha(*(v->now + 2)))
-	{
+	if (HAVE(3) && NEXT2('(', '?') && iscalpha(*(v->now + 2))) {
 		NOTE(REG_UNONPOSIX);
 		v->now += 2;
 		for (; !ATEOS() && iscalpha(*v->now); v->now++)
-			switch (*v->now)
-			{
-				case CHR('b'):	/* BREs (but why???) */
-					v->cflags &= ~(REG_ADVANCED | REG_QUOTE);
-					break;
-				case CHR('c'):	/* case sensitive */
-					v->cflags &= ~REG_ICASE;
-					break;
-				case CHR('e'):	/* plain EREs */
-					v->cflags |= REG_EXTENDED;
-					v->cflags &= ~(REG_ADVF | REG_QUOTE);
-					break;
-				case CHR('i'):	/* case insensitive */
-					v->cflags |= REG_ICASE;
-					break;
-				case CHR('m'):	/* Perloid synonym for n */
-				case CHR('n'):	/* \n affects ^ $ . [^ */
-					v->cflags |= REG_NEWLINE;
-					break;
-				case CHR('p'):	/* ~Perl, \n affects . [^ */
-					v->cflags |= REG_NLSTOP;
-					v->cflags &= ~REG_NLANCH;
-					break;
-				case CHR('q'):	/* literal string */
-					v->cflags |= REG_QUOTE;
-					v->cflags &= ~REG_ADVANCED;
-					break;
-				case CHR('s'):	/* single line, \n ordinary */
-					v->cflags &= ~REG_NEWLINE;
-					break;
-				case CHR('t'):	/* tight syntax */
-					v->cflags &= ~REG_EXPANDED;
-					break;
-				case CHR('w'):	/* weird, \n affects ^ $ only */
-					v->cflags &= ~REG_NLSTOP;
-					v->cflags |= REG_NLANCH;
-					break;
-				case CHR('x'):	/* expanded syntax */
-					v->cflags |= REG_EXPANDED;
-					break;
-				default:
-					ERR(REG_BADOPT);
-					return;
+			switch (*v->now) {
+			case CHR('b'):		/* BREs (but why???) */
+				v->cflags &= ~(REG_ADVANCED|REG_QUOTE);
+				break;
+			case CHR('c'):		/* case sensitive */
+				v->cflags &= ~REG_ICASE;
+				break;
+			case CHR('e'):		/* plain EREs */
+				v->cflags |= REG_EXTENDED;
+				v->cflags &= ~(REG_ADVF|REG_QUOTE);
+				break;
+			case CHR('i'):		/* case insensitive */
+				v->cflags |= REG_ICASE;
+				break;
+			case CHR('m'):		/* Perloid synonym for n */
+			case CHR('n'):		/* \n affects ^ $ . [^ */
+				v->cflags |= REG_NEWLINE;
+				break;
+			case CHR('p'):		/* ~Perl, \n affects . [^ */
+				v->cflags |= REG_NLSTOP;
+				v->cflags &= ~REG_NLANCH;
+				break;
+			case CHR('q'):		/* literal string */
+				v->cflags |= REG_QUOTE;
+				v->cflags &= ~REG_ADVANCED;
+				break;
+			case CHR('s'):		/* single line, \n ordinary */
+				v->cflags &= ~REG_NEWLINE;
+				break;
+			case CHR('t'):		/* tight syntax */
+				v->cflags &= ~REG_EXPANDED;
+				break;
+			case CHR('w'):		/* weird, \n affects ^ $ only */
+				v->cflags &= ~REG_NLSTOP;
+				v->cflags |= REG_NLANCH;
+				break;
+			case CHR('x'):		/* expanded syntax */
+				v->cflags |= REG_EXPANDED;
+				break;
+			default:
+				ERR(REG_BADOPT);
+				return;
 			}
-		if (!NEXT1(')'))
-		{
+		if (!NEXT1(')')) {
 			ERR(REG_BADOPT);
 			return;
 		}
 		v->now++;
-		if (v->cflags & REG_QUOTE)
-			v->cflags &= ~(REG_EXPANDED | REG_NEWLINE);
+		if (v->cflags&REG_QUOTE)
+			v->cflags &= ~(REG_EXPANDED|REG_NEWLINE);
 	}
 }
 
 /*
- * lexnest - "call a subroutine", interpolating string at the lexical level
- *
+ - lexnest - "call a subroutine", interpolating string at the lexical level
  * Note, this is not a very general facility.  There are a number of
  * implicit assumptions about what sorts of strings can be subroutines.
+ ^ static VOID lexnest(struct vars *, chr *, chr *);
  */
-static void
-lexnest(struct vars * v,
-		chr *beginp,			/* start of interpolation */
-		chr *endp)				/* one past end of interpolation */
+static VOID
+lexnest(v, beginp, endp)
+struct vars *v;
+chr *beginp;				/* start of interpolation */
+chr *endp;				/* one past end of interpolation */
 {
-	assert(v->savenow == NULL); /* only one level of nesting */
+	assert(v->savenow == NULL);	/* only one level of nesting */
 	v->savenow = v->now;
 	v->savestop = v->stop;
 	v->now = beginp;
@@ -214,124 +208,123 @@ lexnest(struct vars * v,
 /*
  * string constants to interpolate as expansions of things like \d
  */
-static chr	backd[] = {			/* \d */
+static chr backd[] = {		/* \d */
 	CHR('['), CHR('['), CHR(':'),
 	CHR('d'), CHR('i'), CHR('g'), CHR('i'), CHR('t'),
 	CHR(':'), CHR(']'), CHR(']')
 };
-static chr	backD[] = {			/* \D */
+static chr backD[] = {		/* \D */
 	CHR('['), CHR('^'), CHR('['), CHR(':'),
 	CHR('d'), CHR('i'), CHR('g'), CHR('i'), CHR('t'),
 	CHR(':'), CHR(']'), CHR(']')
 };
-static chr	brbackd[] = {		/* \d within brackets */
+static chr brbackd[] = {	/* \d within brackets */
 	CHR('['), CHR(':'),
 	CHR('d'), CHR('i'), CHR('g'), CHR('i'), CHR('t'),
 	CHR(':'), CHR(']')
 };
-static chr	backs[] = {			/* \s */
+static chr backs[] = {		/* \s */
 	CHR('['), CHR('['), CHR(':'),
 	CHR('s'), CHR('p'), CHR('a'), CHR('c'), CHR('e'),
 	CHR(':'), CHR(']'), CHR(']')
 };
-static chr	backS[] = {			/* \S */
+static chr backS[] = {		/* \S */
 	CHR('['), CHR('^'), CHR('['), CHR(':'),
 	CHR('s'), CHR('p'), CHR('a'), CHR('c'), CHR('e'),
 	CHR(':'), CHR(']'), CHR(']')
 };
-static chr	brbacks[] = {		/* \s within brackets */
+static chr brbacks[] = {	/* \s within brackets */
 	CHR('['), CHR(':'),
 	CHR('s'), CHR('p'), CHR('a'), CHR('c'), CHR('e'),
 	CHR(':'), CHR(']')
 };
-static chr	backw[] = {			/* \w */
+static chr backw[] = {		/* \w */
 	CHR('['), CHR('['), CHR(':'),
 	CHR('a'), CHR('l'), CHR('n'), CHR('u'), CHR('m'),
 	CHR(':'), CHR(']'), CHR('_'), CHR(']')
 };
-static chr	backW[] = {			/* \W */
+static chr backW[] = {		/* \W */
 	CHR('['), CHR('^'), CHR('['), CHR(':'),
 	CHR('a'), CHR('l'), CHR('n'), CHR('u'), CHR('m'),
 	CHR(':'), CHR(']'), CHR('_'), CHR(']')
 };
-static chr	brbackw[] = {		/* \w within brackets */
+static chr brbackw[] = {	/* \w within brackets */
 	CHR('['), CHR(':'),
 	CHR('a'), CHR('l'), CHR('n'), CHR('u'), CHR('m'),
 	CHR(':'), CHR(']'), CHR('_')
 };
 
 /*
- * lexword - interpolate a bracket expression for word characters
+ - lexword - interpolate a bracket expression for word characters
  * Possibly ought to inquire whether there is a "word" character class.
+ ^ static VOID lexword(struct vars *);
  */
-static void
-lexword(struct vars * v)
+static VOID
+lexword(v)
+struct vars *v;
 {
 	lexnest(v, backw, ENDOF(backw));
 }
 
 /*
- * next - get next token
+ - next - get next token
+ ^ static int next(struct vars *);
  */
-static int						/* 1 normal, 0 failure */
-next(struct vars * v)
+static int			/* 1 normal, 0 failure */
+next(v)
+struct vars *v;
 {
-	chr			c;
+	chr c;
 
 	/* errors yield an infinite sequence of failures */
 	if (ISERR())
-		return 0;				/* the error has set nexttype to EOS */
+		return 0;	/* the error has set nexttype to EOS */
 
 	/* remember flavor of last token */
 	v->lasttype = v->nexttype;
 
 	/* REG_BOSONLY */
-	if (v->nexttype == EMPTY && (v->cflags & REG_BOSONLY))
-	{
+	if (v->nexttype == EMPTY && (v->cflags&REG_BOSONLY)) {
 		/* at start of a REG_BOSONLY RE */
 		RETV(SBEGIN, 0);		/* same as \A */
 	}
 
 	/* if we're nested and we've hit end, return to outer level */
-	if (v->savenow != NULL && ATEOS())
-	{
+	if (v->savenow != NULL && ATEOS()) {
 		v->now = v->savenow;
 		v->stop = v->savestop;
 		v->savenow = v->savestop = NULL;
 	}
 
 	/* skip white space etc. if appropriate (not in literal or []) */
-	if (v->cflags & REG_EXPANDED)
-		switch (v->lexcon)
-		{
-			case L_ERE:
-			case L_BRE:
-			case L_EBND:
-			case L_BBND:
-				skip(v);
-				break;
+	if (v->cflags&REG_EXPANDED)
+		switch (v->lexcon) {
+		case L_ERE:
+		case L_BRE:
+		case L_EBND:
+		case L_BBND:
+			skip(v);
+			break;
 		}
 
 	/* handle EOS, depending on context */
-	if (ATEOS())
-	{
-		switch (v->lexcon)
-		{
-			case L_ERE:
-			case L_BRE:
-			case L_Q:
-				RET(EOS);
-				break;
-			case L_EBND:
-			case L_BBND:
-				FAILW(REG_EBRACE);
-				break;
-			case L_BRACK:
-			case L_CEL:
-			case L_ECL:
-			case L_CCL:
-				FAILW(REG_EBRACK);
-				break;
+	if (ATEOS()) {
+		switch (v->lexcon) {
+		case L_ERE:
+		case L_BRE:
+		case L_Q:
+			RET(EOS);
+			break;
+		case L_EBND:
+		case L_BBND:
+			FAILW(REG_EBRACE);
+			break;
+		case L_BRACK:
+		case L_CEL:
+		case L_ECL:
+		case L_CCL:
+			FAILW(REG_EBRACK);
+			break;
 		}
 		assert(NOTREACHED);
 	}
@@ -340,365 +333,314 @@ next(struct vars * v)
 	c = *v->now++;
 
 	/* deal with the easy contexts, punt EREs to code below */
-	switch (v->lexcon)
-	{
-		case L_BRE:				/* punt BREs to separate function */
-			return brenext(v, c);
+	switch (v->lexcon) {
+	case L_BRE:			/* punt BREs to separate function */
+		return brenext(v, c);
+		break;
+	case L_ERE:			/* see below */
+		break;
+	case L_Q:			/* literal strings are easy */
+		RETV(PLAIN, c);
+		break;
+	case L_BBND:			/* bounds are fairly simple */
+	case L_EBND:
+		switch (c) {
+		case CHR('0'): case CHR('1'): case CHR('2'): case CHR('3'):
+		case CHR('4'): case CHR('5'): case CHR('6'): case CHR('7'):
+		case CHR('8'): case CHR('9'):
+			RETV(DIGIT, (chr)DIGITVAL(c));
 			break;
-		case L_ERE:				/* see below */
+		case CHR(','):
+			RET(',');
 			break;
-		case L_Q:				/* literal strings are easy */
-			RETV(PLAIN, c);
+		case CHR('}'):		/* ERE bound ends with } */
+			if (INCON(L_EBND)) {
+				INTOCON(L_ERE);
+				if ((v->cflags&REG_ADVF) && NEXT1('?')) {
+					v->now++;
+					NOTE(REG_UNONPOSIX);
+					RETV('}', 0);
+				}
+				RETV('}', 1);
+			} else
+				FAILW(REG_BADBR);
 			break;
-		case L_BBND:			/* bounds are fairly simple */
-		case L_EBND:
-			switch (c)
-			{
-				case CHR('0'):
-				case CHR('1'):
-				case CHR('2'):
-				case CHR('3'):
-				case CHR('4'):
-				case CHR('5'):
-				case CHR('6'):
-				case CHR('7'):
-				case CHR('8'):
-				case CHR('9'):
-					RETV(DIGIT, (chr) DIGITVAL(c));
-					break;
-				case CHR(','):
-					RET(',');
-					break;
-				case CHR('}'):	/* ERE bound ends with } */
-					if (INCON(L_EBND))
-					{
-						INTOCON(L_ERE);
-						if ((v->cflags & REG_ADVF) && NEXT1('?'))
-						{
-							v->now++;
-							NOTE(REG_UNONPOSIX);
-							RETV('}', 0);
-						}
-						RETV('}', 1);
-					}
-					else
-						FAILW(REG_BADBR);
-					break;
-				case CHR('\\'):	/* BRE bound ends with \} */
-					if (INCON(L_BBND) && NEXT1('}'))
-					{
-						v->now++;
-						INTOCON(L_BRE);
-						RET('}');
-					}
-					else
-						FAILW(REG_BADBR);
-					break;
-				default:
-					FAILW(REG_BADBR);
-					break;
+		case CHR('\\'):		/* BRE bound ends with \} */
+			if (INCON(L_BBND) && NEXT1('}')) {
+				v->now++;
+				INTOCON(L_BRE);
+				RET('}');
+			} else
+				FAILW(REG_BADBR);
+			break;
+		default:
+			FAILW(REG_BADBR);
+			break;
+		}
+		assert(NOTREACHED);
+		break;
+	case L_BRACK:			/* brackets are not too hard */
+		switch (c) {
+		case CHR(']'):
+			if (LASTTYPE('['))
+				RETV(PLAIN, c);
+			else {
+				INTOCON((v->cflags&REG_EXTENDED) ?
+							L_ERE : L_BRE);
+				RET(']');
 			}
-			assert(NOTREACHED);
 			break;
-		case L_BRACK:			/* brackets are not too hard */
-			switch (c)
-			{
-				case CHR(']'):
-					if (LASTTYPE('['))
-						RETV(PLAIN, c);
-					else
-					{
-						INTOCON((v->cflags & REG_EXTENDED) ?
-								L_ERE : L_BRE);
-						RET(']');
-					}
-					break;
-				case CHR('\\'):
-					NOTE(REG_UBBS);
-					if (!(v->cflags & REG_ADVF))
-						RETV(PLAIN, c);
-					NOTE(REG_UNONPOSIX);
-					if (ATEOS())
-						FAILW(REG_EESCAPE);
-					(DISCARD) lexescape(v);
-					switch (v->nexttype)
-					{			/* not all escapes okay here */
-						case PLAIN:
-							return 1;
-							break;
-						case CCLASS:
-							switch (v->nextvalue)
-							{
-								case 'd':
-									lexnest(v, brbackd, ENDOF(brbackd));
-									break;
-								case 's':
-									lexnest(v, brbacks, ENDOF(brbacks));
-									break;
-								case 'w':
-									lexnest(v, brbackw, ENDOF(brbackw));
-									break;
-								default:
-									FAILW(REG_EESCAPE);
-									break;
-							}
-							/* lexnest done, back up and try again */
-							v->nexttype = v->lasttype;
-							return next(v);
-							break;
-					}
-					/* not one of the acceptable escapes */
-					FAILW(REG_EESCAPE);
+		case CHR('\\'):
+			NOTE(REG_UBBS);
+			if (!(v->cflags&REG_ADVF))
+				RETV(PLAIN, c);
+			NOTE(REG_UNONPOSIX);
+			if (ATEOS())
+				FAILW(REG_EESCAPE);
+			(DISCARD)lexescape(v);
+			switch (v->nexttype) {	/* not all escapes okay here */
+			case PLAIN:
+				return 1;
+				break;
+			case CCLASS:
+				switch (v->nextvalue) {
+				case 'd':
+					lexnest(v, brbackd, ENDOF(brbackd));
 					break;
-				case CHR('-'):
-					if (LASTTYPE('[') || NEXT1(']'))
-						RETV(PLAIN, c);
-					else
-						RETV(RANGE, c);
+				case 's':
+					lexnest(v, brbacks, ENDOF(brbacks));
 					break;
-				case CHR('['):
-					if (ATEOS())
-						FAILW(REG_EBRACK);
-					switch (*v->now++)
-					{
-						case CHR('.'):
-							INTOCON(L_CEL);
-							/* might or might not be locale-specific */
-							RET(COLLEL);
-							break;
-						case CHR('='):
-							INTOCON(L_ECL);
-							NOTE(REG_ULOCALE);
-							RET(ECLASS);
-							break;
-						case CHR(':'):
-							INTOCON(L_CCL);
-							NOTE(REG_ULOCALE);
-							RET(CCLASS);
-							break;
-						default:		/* oops */
-							v->now--;
-							RETV(PLAIN, c);
-							break;
-					}
-					assert(NOTREACHED);
+				case 'w':
+					lexnest(v, brbackw, ENDOF(brbackw));
 					break;
 				default:
-					RETV(PLAIN, c);
+					FAILW(REG_EESCAPE);
 					break;
+				}
+				/* lexnest done, back up and try again */
+				v->nexttype = v->lasttype;
+				return next(v);
+				break;
 			}
-			assert(NOTREACHED);
+			/* not one of the acceptable escapes */
+			FAILW(REG_EESCAPE);
 			break;
-		case L_CEL:				/* collating elements are easy */
-			if (c == CHR('.') && NEXT1(']'))
-			{
-				v->now++;
-				INTOCON(L_BRACK);
-				RETV(END, '.');
-			}
-			else
+		case CHR('-'):
+			if (LASTTYPE('[') || NEXT1(']'))
 				RETV(PLAIN, c);
-			break;
-		case L_ECL:				/* ditto equivalence classes */
-			if (c == CHR('=') && NEXT1(']'))
-			{
-				v->now++;
-				INTOCON(L_BRACK);
-				RETV(END, '=');
-			}
 			else
-				RETV(PLAIN, c);
+				RETV(RANGE, c);
 			break;
-		case L_CCL:				/* ditto character classes */
-			if (c == CHR(':') && NEXT1(']'))
-			{
-				v->now++;
-				INTOCON(L_BRACK);
-				RETV(END, ':');
-			}
-			else
+		case CHR('['):
+			if (ATEOS())
+				FAILW(REG_EBRACK);
+			switch (*v->now++) {
+			case CHR('.'):
+				INTOCON(L_CEL);
+				/* might or might not be locale-specific */
+				RET(COLLEL);
+				break;
+			case CHR('='):
+				INTOCON(L_ECL);
+				NOTE(REG_ULOCALE);
+				RET(ECLASS);
+				break;
+			case CHR(':'):
+				INTOCON(L_CCL);
+				NOTE(REG_ULOCALE);
+				RET(CCLASS);
+				break;
+			default:			/* oops */
+				v->now--;
 				RETV(PLAIN, c);
+				break;
+			}
+			assert(NOTREACHED);
 			break;
 		default:
-			assert(NOTREACHED);
+			RETV(PLAIN, c);
 			break;
+		}
+		assert(NOTREACHED);
+		break;
+	case L_CEL:			/* collating elements are easy */
+		if (c == CHR('.') && NEXT1(']')) {
+			v->now++;
+			INTOCON(L_BRACK);
+			RETV(END, '.');
+		} else
+			RETV(PLAIN, c);
+		break;
+	case L_ECL:			/* ditto equivalence classes */
+		if (c == CHR('=') && NEXT1(']')) {
+			v->now++;
+			INTOCON(L_BRACK);
+			RETV(END, '=');
+		} else
+			RETV(PLAIN, c);
+		break;
+	case L_CCL:			/* ditto character classes */
+		if (c == CHR(':') && NEXT1(']')) {
+			v->now++;
+			INTOCON(L_BRACK);
+			RETV(END, ':');
+		} else
+			RETV(PLAIN, c);
+		break;
+	default:
+		assert(NOTREACHED);
+		break;
 	}
 
 	/* that got rid of everything except EREs and AREs */
 	assert(INCON(L_ERE));
 
 	/* deal with EREs and AREs, except for backslashes */
-	switch (c)
-	{
-		case CHR('|'):
-			RET('|');
-			break;
-		case CHR('*'):
-			if ((v->cflags & REG_ADVF) && NEXT1('?'))
-			{
-				v->now++;
-				NOTE(REG_UNONPOSIX);
-				RETV('*', 0);
-			}
-			RETV('*', 1);
-			break;
-		case CHR('+'):
-			if ((v->cflags & REG_ADVF) && NEXT1('?'))
-			{
-				v->now++;
-				NOTE(REG_UNONPOSIX);
-				RETV('+', 0);
-			}
-			RETV('+', 1);
-			break;
-		case CHR('?'):
-			if ((v->cflags & REG_ADVF) && NEXT1('?'))
-			{
-				v->now++;
-				NOTE(REG_UNONPOSIX);
-				RETV('?', 0);
-			}
-			RETV('?', 1);
-			break;
-		case CHR('{'):			/* bounds start or plain character */
-			if (v->cflags & REG_EXPANDED)
-				skip(v);
-			if (ATEOS() || !iscdigit(*v->now))
-			{
-				NOTE(REG_UBRACES);
-				NOTE(REG_UUNSPEC);
-				RETV(PLAIN, c);
-			}
-			else
-			{
-				NOTE(REG_UBOUNDS);
-				INTOCON(L_EBND);
-				RET('{');
+	switch (c) {
+	case CHR('|'):
+		RET('|');
+		break;
+	case CHR('*'):
+		if ((v->cflags&REG_ADVF) && NEXT1('?')) {
+			v->now++;
+			NOTE(REG_UNONPOSIX);
+			RETV('*', 0);
+		}
+		RETV('*', 1);
+		break;
+	case CHR('+'):
+		if ((v->cflags&REG_ADVF) && NEXT1('?')) {
+			v->now++;
+			NOTE(REG_UNONPOSIX);
+			RETV('+', 0);
+		}
+		RETV('+', 1);
+		break;
+	case CHR('?'):
+		if ((v->cflags&REG_ADVF) && NEXT1('?')) {
+			v->now++;
+			NOTE(REG_UNONPOSIX);
+			RETV('?', 0);
+		}
+		RETV('?', 1);
+		break;
+	case CHR('{'):		/* bounds start or plain character */
+		if (v->cflags&REG_EXPANDED)
+			skip(v);
+		if (ATEOS() || !iscdigit(*v->now)) {
+			NOTE(REG_UBRACES);
+			NOTE(REG_UUNSPEC);
+			RETV(PLAIN, c);
+		} else {
+			NOTE(REG_UBOUNDS);
+			INTOCON(L_EBND);
+			RET('{');
+		}
+		assert(NOTREACHED);
+		break;
+	case CHR('('):		/* parenthesis, or advanced extension */
+		if ((v->cflags&REG_ADVF) && NEXT1('?')) {
+			NOTE(REG_UNONPOSIX);
+			v->now++;
+			switch (*v->now++) {
+			case CHR(':'):		/* non-capturing paren */
+				RETV('(', 0);
+				break;
+			case CHR('#'):		/* comment */
+				while (!ATEOS() && *v->now != CHR(')'))
+					v->now++;
+				if (!ATEOS())
+					v->now++;
+				assert(v->nexttype == v->lasttype);
+				return next(v);
+				break;
+			case CHR('='):		/* positive lookahead */
+				NOTE(REG_ULOOKAHEAD);
+				RETV(LACON, 1);
+				break;
+			case CHR('!'):		/* negative lookahead */
+				NOTE(REG_ULOOKAHEAD);
+				RETV(LACON, 0);
+				break;
+			default:
+				FAILW(REG_BADRPT);
+				break;
 			}
 			assert(NOTREACHED);
-			break;
-		case CHR('('):			/* parenthesis, or advanced extension */
-			if ((v->cflags & REG_ADVF) && NEXT1('?'))
-			{
-				NOTE(REG_UNONPOSIX);
-				v->now++;
-				switch (*v->now++)
-				{
-					case CHR(':'):		/* non-capturing paren */
-						RETV('(', 0);
-						break;
-					case CHR('#'):		/* comment */
-						while (!ATEOS() && *v->now != CHR(')'))
-							v->now++;
-						if (!ATEOS())
-							v->now++;
-						assert(v->nexttype == v->lasttype);
-						return next(v);
-						break;
-					case CHR('='):		/* positive lookahead */
-						NOTE(REG_ULOOKAHEAD);
-						RETV(LACON, 1);
-						break;
-					case CHR('!'):		/* negative lookahead */
-						NOTE(REG_ULOOKAHEAD);
-						RETV(LACON, 0);
-						break;
-					default:
-						FAILW(REG_BADRPT);
-						break;
-				}
-				assert(NOTREACHED);
-			}
-			if (v->cflags & REG_NOSUB)
-				RETV('(', 0);	/* all parens non-capturing */
-			else
-				RETV('(', 1);
-			break;
-		case CHR(')'):
-			if (LASTTYPE('('))
-				NOTE(REG_UUNSPEC);
-			RETV(')', c);
-			break;
-		case CHR('['):			/* easy except for [[:<:]] and [[:>:]] */
-			if (HAVE(6) && *(v->now + 0) == CHR('[') &&
-				*(v->now + 1) == CHR(':') &&
-				(*(v->now + 2) == CHR('<') ||
-				 *(v->now + 2) == CHR('>')) &&
-				*(v->now + 3) == CHR(':') &&
-				*(v->now + 4) == CHR(']') &&
-				*(v->now + 5) == CHR(']'))
-			{
-				c = *(v->now + 2);
-				v->now += 6;
-				NOTE(REG_UNONPOSIX);
-				RET((c == CHR('<')) ? '<' : '>');
-			}
-			INTOCON(L_BRACK);
-			if (NEXT1('^'))
-			{
-				v->now++;
-				RETV('[', 0);
-			}
-			RETV('[', 1);
-			break;
-		case CHR('.'):
-			RET('.');
-			break;
-		case CHR('^'):
-			RET('^');
-			break;
-		case CHR('$'):
-			RET('$');
-			break;
-		case CHR('\\'): /* mostly punt backslashes to code below */
-			if (ATEOS())
-				FAILW(REG_EESCAPE);
-			break;
-		default:				/* ordinary character */
-			RETV(PLAIN, c);
-			break;
+		}
+		if (v->cflags&REG_NOSUB)
+			RETV('(', 0);		/* all parens non-capturing */
+		else
+			RETV('(', 1);
+		break;
+	case CHR(')'):
+		if (LASTTYPE('(')) {
+			NOTE(REG_UUNSPEC);
+		}
+		RETV(')', c);
+		break;
+	case CHR('['):		/* easy except for [[:<:]] and [[:>:]] */
+		if (HAVE(6) &&	*(v->now+0) == CHR('[') &&
+				*(v->now+1) == CHR(':') &&
+				(*(v->now+2) == CHR('<') ||
+						*(v->now+2) == CHR('>')) &&
+				*(v->now+3) == CHR(':') &&
+				*(v->now+4) == CHR(']') &&
+				*(v->now+5) == CHR(']')) {
+			c = *(v->now+2);
+			v->now += 6;
+			NOTE(REG_UNONPOSIX);
+			RET((c == CHR('<')) ? '<' : '>');
+		}
+		INTOCON(L_BRACK);
+		if (NEXT1('^')) {
+			v->now++;
+			RETV('[', 0);
+		}
+		RETV('[', 1);
+		break;
+	case CHR('.'):
+		RET('.');
+		break;
+	case CHR('^'):
+		RET('^');
+		break;
+	case CHR('$'):
+		RET('$');
+		break;
+	case CHR('\\'):		/* mostly punt backslashes to code below */
+		if (ATEOS())
+			FAILW(REG_EESCAPE);
+		break;
+	default:		/* ordinary character */
+		RETV(PLAIN, c);
+		break;
 	}
 
 	/* ERE/ARE backslash handling; backslash already eaten */
 	assert(!ATEOS());
-	if (!(v->cflags & REG_ADVF))
-	{							/* only AREs have non-trivial escapes */
-		if (iscalnum(*v->now))
-		{
+	if (!(v->cflags&REG_ADVF)) {	/* only AREs have non-trivial escapes */
+		if (iscalnum(*v->now)) {
 			NOTE(REG_UBSALNUM);
 			NOTE(REG_UUNSPEC);
 		}
 		RETV(PLAIN, *v->now++);
 	}
-	(DISCARD) lexescape(v);
+	(DISCARD)lexescape(v);
 	if (ISERR())
 		FAILW(REG_EESCAPE);
-	if (v->nexttype == CCLASS)
-	{							/* fudge at lexical level */
-		switch (v->nextvalue)
-		{
-			case 'd':
-				lexnest(v, backd, ENDOF(backd));
-				break;
-			case 'D':
-				lexnest(v, backD, ENDOF(backD));
-				break;
-			case 's':
-				lexnest(v, backs, ENDOF(backs));
-				break;
-			case 'S':
-				lexnest(v, backS, ENDOF(backS));
-				break;
-			case 'w':
-				lexnest(v, backw, ENDOF(backw));
-				break;
-			case 'W':
-				lexnest(v, backW, ENDOF(backW));
-				break;
-			default:
-				assert(NOTREACHED);
-				FAILW(REG_ASSERT);
-				break;
+	if (v->nexttype == CCLASS) {	/* fudge at lexical level */
+		switch (v->nextvalue) {
+		case 'd':	lexnest(v, backd, ENDOF(backd)); break;
+		case 'D':	lexnest(v, backD, ENDOF(backD)); break;
+		case 's':	lexnest(v, backs, ENDOF(backs)); break;
+		case 'S':	lexnest(v, backS, ENDOF(backS)); break;
+		case 'w':	lexnest(v, backw, ENDOF(backw)); break;
+		case 'W':	lexnest(v, backW, ENDOF(backW)); break;
+		default:
+			assert(NOTREACHED);
+			FAILW(REG_ASSERT);
+			break;
 		}
 		/* lexnest done, back up and try again */
 		v->nexttype = v->lasttype;
@@ -709,23 +651,24 @@ next(struct vars * v)
 }
 
 /*
- * lexescape - parse an ARE backslash escape (backslash already eaten)
+ - lexescape - parse an ARE backslash escape (backslash already eaten)
  * Note slightly nonstandard use of the CCLASS type code.
+ ^ static int lexescape(struct vars *);
  */
-static int						/* not actually used, but convenient for
-								 * RETV */
-lexescape(struct vars * v)
+static int			/* not actually used, but convenient for RETV */
+lexescape(v)
+struct vars *v;
 {
-	chr			c;
-	static chr	alert[] = {
+	chr c;
+	static chr alert[] = {
 		CHR('a'), CHR('l'), CHR('e'), CHR('r'), CHR('t')
 	};
-	static chr	esc[] = {
+	static chr esc[] = {
 		CHR('E'), CHR('S'), CHR('C')
 	};
-	chr		   *save;
+	chr *save;
 
-	assert(v->cflags & REG_ADVF);
+	assert(v->cflags&REG_ADVF);
 
 	assert(!ATEOS());
 	c = *v->now++;
@@ -733,295 +676,255 @@ lexescape(struct vars * v)
 		RETV(PLAIN, c);
 
 	NOTE(REG_UNONPOSIX);
-	switch (c)
-	{
-		case CHR('a'):
-			RETV(PLAIN, chrnamed(v, alert, ENDOF(alert), CHR('\007')));
-			break;
-		case CHR('A'):
-			RETV(SBEGIN, 0);
-			break;
-		case CHR('b'):
-			RETV(PLAIN, CHR('\b'));
-			break;
-		case CHR('B'):
-			RETV(PLAIN, CHR('\\'));
-			break;
-		case CHR('c'):
-			NOTE(REG_UUNPORT);
-			if (ATEOS())
-				FAILW(REG_EESCAPE);
-			RETV(PLAIN, (chr) (*v->now++ & 037));
-			break;
-		case CHR('d'):
-			NOTE(REG_ULOCALE);
-			RETV(CCLASS, 'd');
-			break;
-		case CHR('D'):
-			NOTE(REG_ULOCALE);
-			RETV(CCLASS, 'D');
-			break;
-		case CHR('e'):
-			NOTE(REG_UUNPORT);
-			RETV(PLAIN, chrnamed(v, esc, ENDOF(esc), CHR('\033')));
-			break;
-		case CHR('f'):
-			RETV(PLAIN, CHR('\f'));
-			break;
-		case CHR('m'):
-			RET('<');
-			break;
-		case CHR('M'):
-			RET('>');
-			break;
-		case CHR('n'):
-			RETV(PLAIN, CHR('\n'));
-			break;
-		case CHR('r'):
-			RETV(PLAIN, CHR('\r'));
-			break;
-		case CHR('s'):
-			NOTE(REG_ULOCALE);
-			RETV(CCLASS, 's');
-			break;
-		case CHR('S'):
-			NOTE(REG_ULOCALE);
-			RETV(CCLASS, 'S');
-			break;
-		case CHR('t'):
-			RETV(PLAIN, CHR('\t'));
-			break;
-		case CHR('u'):
-			c = lexdigits(v, 16, 4, 4);
-			if (ISERR())
-				FAILW(REG_EESCAPE);
-			RETV(PLAIN, c);
-			break;
-		case CHR('U'):
-			c = lexdigits(v, 16, 8, 8);
-			if (ISERR())
-				FAILW(REG_EESCAPE);
-			RETV(PLAIN, c);
-			break;
-		case CHR('v'):
-			RETV(PLAIN, CHR('\v'));
-			break;
-		case CHR('w'):
-			NOTE(REG_ULOCALE);
-			RETV(CCLASS, 'w');
-			break;
-		case CHR('W'):
-			NOTE(REG_ULOCALE);
-			RETV(CCLASS, 'W');
-			break;
-		case CHR('x'):
-			NOTE(REG_UUNPORT);
-			c = lexdigits(v, 16, 1, 255);		/* REs >255 long outside
-												 * spec */
-			if (ISERR())
-				FAILW(REG_EESCAPE);
-			RETV(PLAIN, c);
-			break;
-		case CHR('y'):
-			NOTE(REG_ULOCALE);
-			RETV(WBDRY, 0);
-			break;
-		case CHR('Y'):
-			NOTE(REG_ULOCALE);
-			RETV(NWBDRY, 0);
-			break;
-		case CHR('Z'):
-			RETV(SEND, 0);
-			break;
-		case CHR('1'):
-		case CHR('2'):
-		case CHR('3'):
-		case CHR('4'):
-		case CHR('5'):
-		case CHR('6'):
-		case CHR('7'):
-		case CHR('8'):
-		case CHR('9'):
-			save = v->now;
-			v->now--;			/* put first digit back */
-			c = lexdigits(v, 10, 1, 255);		/* REs >255 long outside
-												 * spec */
-			if (ISERR())
-				FAILW(REG_EESCAPE);
-			/* ugly heuristic (first test is "exactly 1 digit?") */
-			if (v->now - save == 0 || (int) c <= v->nsubexp)
-			{
-				NOTE(REG_UBACKREF);
-				RETV(BACKREF, (chr) c);
-			}
-			/* oops, doesn't look like it's a backref after all... */
-			v->now = save;
-			/* and fall through into octal number */
-		case CHR('0'):
-			NOTE(REG_UUNPORT);
-			v->now--;			/* put first digit back */
-			c = lexdigits(v, 8, 1, 3);
-			if (ISERR())
-				FAILW(REG_EESCAPE);
-			RETV(PLAIN, c);
-			break;
-		default:
-			assert(iscalpha(c));
-			FAILW(REG_EESCAPE); /* unknown alphabetic escape */
-			break;
+	switch (c) {
+	case CHR('a'):
+		RETV(PLAIN, chrnamed(v, alert, ENDOF(alert), CHR('\007')));
+		break;
+	case CHR('A'):
+		RETV(SBEGIN, 0);
+		break;
+	case CHR('b'):
+		RETV(PLAIN, CHR('\b'));
+		break;
+	case CHR('B'):
+		RETV(PLAIN, CHR('\\'));
+		break;
+	case CHR('c'):
+		NOTE(REG_UUNPORT);
+		if (ATEOS())
+			FAILW(REG_EESCAPE);
+		RETV(PLAIN, (chr)(*v->now++ & 037));
+		break;
+	case CHR('d'):
+		NOTE(REG_ULOCALE);
+		RETV(CCLASS, 'd');
+		break;
+	case CHR('D'):
+		NOTE(REG_ULOCALE);
+		RETV(CCLASS, 'D');
+		break;
+	case CHR('e'):
+		NOTE(REG_UUNPORT);
+		RETV(PLAIN, chrnamed(v, esc, ENDOF(esc), CHR('\033')));
+		break;
+	case CHR('f'):
+		RETV(PLAIN, CHR('\f'));
+		break;
+	case CHR('m'):
+		RET('<');
+		break;
+	case CHR('M'):
+		RET('>');
+		break;
+	case CHR('n'):
+		RETV(PLAIN, CHR('\n'));
+		break;
+	case CHR('r'):
+		RETV(PLAIN, CHR('\r'));
+		break;
+	case CHR('s'):
+		NOTE(REG_ULOCALE);
+		RETV(CCLASS, 's');
+		break;
+	case CHR('S'):
+		NOTE(REG_ULOCALE);
+		RETV(CCLASS, 'S');
+		break;
+	case CHR('t'):
+		RETV(PLAIN, CHR('\t'));
+		break;
+	case CHR('u'):
+		c = lexdigits(v, 16, 4, 4);
+		if (ISERR())
+			FAILW(REG_EESCAPE);
+		RETV(PLAIN, c);
+		break;
+	case CHR('U'):
+		c = lexdigits(v, 16, 8, 8);
+		if (ISERR())
+			FAILW(REG_EESCAPE);
+		RETV(PLAIN, c);
+		break;
+	case CHR('v'):
+		RETV(PLAIN, CHR('\v'));
+		break;
+	case CHR('w'):
+		NOTE(REG_ULOCALE);
+		RETV(CCLASS, 'w');
+		break;
+	case CHR('W'):
+		NOTE(REG_ULOCALE);
+		RETV(CCLASS, 'W');
+		break;
+	case CHR('x'):
+		NOTE(REG_UUNPORT);
+		c = lexdigits(v, 16, 1, 255);	/* REs >255 long outside spec */
+		if (ISERR())
+			FAILW(REG_EESCAPE);
+		RETV(PLAIN, c);
+		break;
+	case CHR('y'):
+		NOTE(REG_ULOCALE);
+		RETV(WBDRY, 0);
+		break;
+	case CHR('Y'):
+		NOTE(REG_ULOCALE);
+		RETV(NWBDRY, 0);
+		break;
+	case CHR('Z'):
+		RETV(SEND, 0);
+		break;
+	case CHR('1'): case CHR('2'): case CHR('3'): case CHR('4'):
+	case CHR('5'): case CHR('6'): case CHR('7'): case CHR('8'):
+	case CHR('9'):
+		save = v->now;
+		v->now--;	/* put first digit back */
+		c = lexdigits(v, 10, 1, 255);	/* REs >255 long outside spec */
+		if (ISERR())
+			FAILW(REG_EESCAPE);
+		/* ugly heuristic (first test is "exactly 1 digit?") */
+		if (v->now - save == 0 || (int)c <= v->nsubexp) {
+			NOTE(REG_UBACKREF);
+			RETV(BACKREF, (chr)c);
+		}
+		/* oops, doesn't look like it's a backref after all... */
+		v->now = save;
+		/* and fall through into octal number */
+	case CHR('0'):
+		NOTE(REG_UUNPORT);
+		v->now--;	/* put first digit back */
+		c = lexdigits(v, 8, 1, 3);
+		if (ISERR())
+			FAILW(REG_EESCAPE);
+		RETV(PLAIN, c);
+		break;
+	default:
+		assert(iscalpha(c));
+		FAILW(REG_EESCAPE);	/* unknown alphabetic escape */
+		break;
 	}
 	assert(NOTREACHED);
 }
 
 /*
- * lexdigits - slurp up digits and return chr value
+ - lexdigits - slurp up digits and return chr value
+ ^ static chr lexdigits(struct vars *, int, int, int);
  */
-static chr						/* chr value; errors signalled via ERR */
-lexdigits(struct vars * v,
-		  int base,
-		  int minlen,
-		  int maxlen)
+static chr			/* chr value; errors signalled via ERR */
+lexdigits(v, base, minlen, maxlen)
+struct vars *v;
+int base;
+int minlen;
+int maxlen;
 {
-	uchr		n;				/* unsigned to avoid overflow misbehavior */
-	int			len;
-	chr			c;
-	int			d;
-	const uchr	ub = (uchr) base;
+	uchr n;			/* unsigned to avoid overflow misbehavior */
+	int len;
+	chr c;
+	int d;
+	CONST uchr ub = (uchr) base;
 
 	n = 0;
-	for (len = 0; len < maxlen && !ATEOS(); len++)
-	{
+	for (len = 0; len < maxlen && !ATEOS(); len++) {
 		c = *v->now++;
-		switch (c)
-		{
-			case CHR('0'):
-			case CHR('1'):
-			case CHR('2'):
-			case CHR('3'):
-			case CHR('4'):
-			case CHR('5'):
-			case CHR('6'):
-			case CHR('7'):
-			case CHR('8'):
-			case CHR('9'):
-				d = DIGITVAL(c);
-				break;
-			case CHR('a'):
-			case CHR('A'):
-				d = 10;
-				break;
-			case CHR('b'):
-			case CHR('B'):
-				d = 11;
-				break;
-			case CHR('c'):
-			case CHR('C'):
-				d = 12;
-				break;
-			case CHR('d'):
-			case CHR('D'):
-				d = 13;
-				break;
-			case CHR('e'):
-			case CHR('E'):
-				d = 14;
-				break;
-			case CHR('f'):
-			case CHR('F'):
-				d = 15;
-				break;
-			default:
-				v->now--;		/* oops, not a digit at all */
-				d = -1;
-				break;
+		switch (c) {
+		case CHR('0'): case CHR('1'): case CHR('2'): case CHR('3'):
+		case CHR('4'): case CHR('5'): case CHR('6'): case CHR('7'):
+		case CHR('8'): case CHR('9'):
+			d = DIGITVAL(c);
+			break;
+		case CHR('a'): case CHR('A'): d = 10; break;
+		case CHR('b'): case CHR('B'): d = 11; break;
+		case CHR('c'): case CHR('C'): d = 12; break;
+		case CHR('d'): case CHR('D'): d = 13; break;
+		case CHR('e'): case CHR('E'): d = 14; break;
+		case CHR('f'): case CHR('F'): d = 15; break;
+		default:
+			v->now--;	/* oops, not a digit at all */
+			d = -1;
+			break;
 		}
 
-		if (d >= base)
-		{						/* not a plausible digit */
+		if (d >= base) {	/* not a plausible digit */
 			v->now--;
 			d = -1;
 		}
 		if (d < 0)
-			break;				/* NOTE BREAK OUT */
-		n = n * ub + (uchr) d;
+			break;		/* NOTE BREAK OUT */
+		n = n*ub + (uchr)d;
 	}
 	if (len < minlen)
 		ERR(REG_EESCAPE);
 
-	return (chr) n;
+	return (chr)n;
 }
 
 /*
- * brenext - get next BRE token
- *
+ - brenext - get next BRE token
  * This is much like EREs except for all the stupid backslashes and the
  * context-dependency of some things.
+ ^ static int brenext(struct vars *, pchr);
  */
-static int						/* 1 normal, 0 failure */
-brenext(struct vars * v,
-		chr pc)
+static int			/* 1 normal, 0 failure */
+brenext(v, pc)
+struct vars *v;
+pchr pc;
 {
-	chr			c = (chr) pc;
+	chr c = (chr)pc;
 
-	switch (c)
-	{
-		case CHR('*'):
-			if (LASTTYPE(EMPTY) || LASTTYPE('(') || LASTTYPE('^'))
-				RETV(PLAIN, c);
-			RET('*');
-			break;
-		case CHR('['):
-			if (HAVE(6) && *(v->now + 0) == CHR('[') &&
-				*(v->now + 1) == CHR(':') &&
-				(*(v->now + 2) == CHR('<') ||
-				 *(v->now + 2) == CHR('>')) &&
-				*(v->now + 3) == CHR(':') &&
-				*(v->now + 4) == CHR(']') &&
-				*(v->now + 5) == CHR(']'))
-			{
-				c = *(v->now + 2);
-				v->now += 6;
-				NOTE(REG_UNONPOSIX);
-				RET((c == CHR('<')) ? '<' : '>');
-			}
-			INTOCON(L_BRACK);
-			if (NEXT1('^'))
-			{
-				v->now++;
-				RETV('[', 0);
-			}
-			RETV('[', 1);
-			break;
-		case CHR('.'):
-			RET('.');
-			break;
-		case CHR('^'):
-			if (LASTTYPE(EMPTY))
-				RET('^');
-			if (LASTTYPE('('))
-			{
-				NOTE(REG_UUNSPEC);
-				RET('^');
-			}
-			RETV(PLAIN, c);
-			break;
-		case CHR('$'):
-			if (v->cflags & REG_EXPANDED)
-				skip(v);
-			if (ATEOS())
-				RET('$');
-			if (NEXT2('\\', ')'))
-			{
-				NOTE(REG_UUNSPEC);
-				RET('$');
-			}
+	switch (c) {
+	case CHR('*'):
+		if (LASTTYPE(EMPTY) || LASTTYPE('(') || LASTTYPE('^'))
 			RETV(PLAIN, c);
-			break;
-		case CHR('\\'):
-			break;				/* see below */
-		default:
-			RETV(PLAIN, c);
-			break;
+		RET('*');
+		break;
+	case CHR('['):
+		if (HAVE(6) &&	*(v->now+0) == CHR('[') &&
+				*(v->now+1) == CHR(':') &&
+				(*(v->now+2) == CHR('<') ||
+						*(v->now+2) == CHR('>')) &&
+				*(v->now+3) == CHR(':') &&
+				*(v->now+4) == CHR(']') &&
+				*(v->now+5) == CHR(']')) {
+			c = *(v->now+2);
+			v->now += 6;
+			NOTE(REG_UNONPOSIX);
+			RET((c == CHR('<')) ? '<' : '>');
+		}
+		INTOCON(L_BRACK);
+		if (NEXT1('^')) {
+			v->now++;
+			RETV('[', 0);
+		}
+		RETV('[', 1);
+		break;
+	case CHR('.'):
+		RET('.');
+		break;
+	case CHR('^'):
+		if (LASTTYPE(EMPTY))
+			RET('^');
+		if (LASTTYPE('(')) {
+			NOTE(REG_UUNSPEC);
+			RET('^');
+		}
+		RETV(PLAIN, c);
+		break;
+	case CHR('$'):
+		if (v->cflags&REG_EXPANDED)
+			skip(v);
+		if (ATEOS())
+			RET('$');
+		if (NEXT2('\\', ')')) {
+			NOTE(REG_UUNSPEC);
+			RET('$');
+		}
+		RETV(PLAIN, c);
+		break;
+	case CHR('\\'):
+		break;		/* see below */
+	default:
+		RETV(PLAIN, c);
+		break;
 	}
 
 	assert(c == CHR('\\'));
@@ -1030,64 +933,57 @@ brenext(struct vars * v,
 		FAILW(REG_EESCAPE);
 
 	c = *v->now++;
-	switch (c)
-	{
-		case CHR('{'):
-			INTOCON(L_BBND);
-			NOTE(REG_UBOUNDS);
-			RET('{');
-			break;
-		case CHR('('):
-			RETV('(', 1);
-			break;
-		case CHR(')'):
-			RETV(')', c);
-			break;
-		case CHR('<'):
-			NOTE(REG_UNONPOSIX);
-			RET('<');
-			break;
-		case CHR('>'):
-			NOTE(REG_UNONPOSIX);
-			RET('>');
-			break;
-		case CHR('1'):
-		case CHR('2'):
-		case CHR('3'):
-		case CHR('4'):
-		case CHR('5'):
-		case CHR('6'):
-		case CHR('7'):
-		case CHR('8'):
-		case CHR('9'):
-			NOTE(REG_UBACKREF);
-			RETV(BACKREF, (chr) DIGITVAL(c));
-			break;
-		default:
-			if (iscalnum(c))
-			{
-				NOTE(REG_UBSALNUM);
-				NOTE(REG_UUNSPEC);
-			}
-			RETV(PLAIN, c);
-			break;
+	switch (c) {
+	case CHR('{'):
+		INTOCON(L_BBND);
+		NOTE(REG_UBOUNDS);
+		RET('{');
+		break;
+	case CHR('('):
+		RETV('(', 1);
+		break;
+	case CHR(')'):
+		RETV(')', c);
+		break;
+	case CHR('<'):
+		NOTE(REG_UNONPOSIX);
+		RET('<');
+		break;
+	case CHR('>'):
+		NOTE(REG_UNONPOSIX);
+		RET('>');
+		break;
+	case CHR('1'): case CHR('2'): case CHR('3'): case CHR('4'):
+	case CHR('5'): case CHR('6'): case CHR('7'): case CHR('8'):
+	case CHR('9'):
+		NOTE(REG_UBACKREF);
+		RETV(BACKREF, (chr)DIGITVAL(c));
+		break;
+	default:
+		if (iscalnum(c)) {
+			NOTE(REG_UBSALNUM);
+			NOTE(REG_UUNSPEC);
+		}
+		RETV(PLAIN, c);
+		break;
 	}
 
 	assert(NOTREACHED);
 }
 
 /*
- * skip - skip white space and comments in expanded form
+ - skip - skip white space and comments in expanded form
+ ^ static VOID skip(struct vars *);
  */
-static void
-skip(struct vars * v)
+static VOID
+skip(v)
+struct vars *v;
 {
-	chr		   *start = v->now;
+	chr *start = v->now;
 
-	assert(v->cflags & REG_EXPANDED);
+	assert(v->cflags&REG_EXPANDED);
 
-	for (;;)
-	{
+	for (;;) {
 		while (!ATEOS() && iscspace(*v->now))
 			v->now++;
 		if (ATEOS() || *v->now != CHR('#'))
@@ -1103,31 +999,50 @@ skip(struct vars * v)
 }
 
 /*
- * newline - return the chr for a newline
- *
+ - newline - return the chr for a newline
  * This helps confine use of CHR to this source file.
+ ^ static chr newline(NOPARMS);
  */
 static chr
-newline(void)
+newline()
 {
 	return CHR('\n');
 }
 
 /*
- * chrnamed - return the chr known by a given (chr string) name
- *
+ - ch - return the chr sequence for regc_locale.c's fake collating element ch
+ * This helps confine use of CHR to this source file.  Beware that the caller
+ * knows how long the sequence is.
+ ^ #ifdef REG_DEBUG
+ ^ static chr *ch(NOPARMS);
+ ^ #endif
+ */
+#ifdef REG_DEBUG
+static chr *
+ch()
+{
+	static chr chstr[] = { CHR('c'), CHR('h'), CHR('\0') };
+
+	return chstr;
+}
+#endif
+
+/*
+ - chrnamed - return the chr known by a given (chr string) name
  * The code is a bit clumsy, but this routine gets only such specialized
  * use that it hardly matters.
+ ^ static chr chrnamed(struct vars *, chr *, chr *, pchr);
  */
 static chr
-chrnamed(struct vars * v,
-		 chr *startp,			/* start of name */
-		 chr *endp,				/* just past end of name */
-		 chr lastresort)		/* what to return if name lookup fails */
+chrnamed(v, startp, endp, lastresort)
+struct vars *v;
+chr *startp;			/* start of name */
+chr *endp;			/* just past end of name */
+pchr lastresort;		/* what to return if name lookup fails */
 {
-	celt		c;
-	int			errsave;
-	int			e;
+	celt c;
+	int errsave;
+	int e;
 	struct cvec *cv;
 
 	errsave = v->err;
@@ -1137,10 +1052,10 @@ chrnamed(struct vars * v,
 	v->err = errsave;
 
 	if (e != 0)
-		return (chr) lastresort;
+		return (chr)lastresort;
 
 	cv = range(v, c, c, 0);
 	if (cv->nchrs == 0)
-		return (chr) lastresort;
+		return (chr)lastresort;
 	return cv->chrs[0];
 }