next step in the yylex unification: handle quoted strings in a nicer fashion

as found in hoststated, and make all the code diff as clean as possible. a
few issues remain mostly surrounding include support, which will likely be
added to more of the grammers soon.
ok norby pyr, others

src/usr.sbin/ntpd/parse.y

@@ -1,4 +1,4 @@
-/*	$OpenBSD: parse.y,v 1.35 2007/09/14 06:29:54 deraadt Exp $ */
+/*	$OpenBSD: parse.y,v 1.36 2007/10/11 14:39:17 deraadt Exp $ */
 
 /*
  * Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -46,7 +46,7 @@ int	 yyerror(const char *, ...);
 int	 yyparse(void);
 int	 kw_cmp(const void *, const void *);
 int	 lookup(char *);
-int	 lgetc(FILE *);
+int	 lgetc(int);
 int	 lungetc(int);
 int	 findeol(void);
 int	 yylex(void);
@@ -327,9 +327,10 @@ char	 pushback_buffer[MAXPUSHBACK];
 int	 pushback_index = 0;
 
 int
-lgetc(FILE *f)
+lgetc(int inquot)
 {
 	int	c, next;
+	FILE *f = fin;
 
 	if (parsebuf) {
 		/* Read character from the parsebuffer instead of input. */
@@ -345,6 +346,11 @@ lgetc(FILE *f)
 	if (pushback_index)
 		return (pushback_buffer[--pushback_index]);
 
+	if (inquot) {
+		c = getc(f);
+		return (c);
+	}
+
 	while ((c = getc(f)) == '\\') {
 		next = getc(f);
 		if (next != '\n') {
@@ -392,7 +398,7 @@ findeol(void)
 
 	/* skip to either EOF or the first real EOL */
 	while (1) {
-		c = lgetc(fin);
+		c = lgetc(0);
 		if (c == '\n') {
 			lineno++;
 			break;
@@ -408,16 +414,16 @@ yylex(void)
 {
 	char	 buf[8096];
 	char	*p;
-	int	 endc, c;
+	int	 endc, next, c;
 	int	 token;
 
 	p = buf;
-	while ((c = lgetc(fin)) == ' ')
+	while ((c = lgetc(0)) == ' ')
 		; /* nothing */
 
 	yylval.lineno = lineno;
 	if (c == '#')
-		while ((c = lgetc(fin)) != '\n' && c != EOF)
+		while ((c = lgetc(0)) != '\n' && c != EOF)
 			; /* nothing */
 
 	switch (c) {
@@ -425,15 +431,21 @@ yylex(void)
 	case '"':
 		endc = c;
 		while (1) {
-			if ((c = lgetc(fin)) == EOF)
+			if ((c = lgetc(1)) == EOF)
 				return (0);
-			if (c == endc) {
-				*p = '\0';
-				break;
-			}
 			if (c == '\n') {
 				lineno++;
 				continue;
+			} else if (c == '\\') {
+				if ((next = lgetc(1)) == EOF)
+					return (0);
+				if (next == endc)
+					c = next;
+				else
+					lungetc(next);
+			} else if (c == endc) {
+				*p = '\0';
+				break;
 			}
 			if (p + 1 >= buf + sizeof(buf) - 1) {
 				yyerror("string too long");
@@ -457,7 +469,7 @@ yylex(void)
 				yyerror("string too long");
 				return (findeol());
 			}
-		} while ((c = lgetc(fin)) != EOF && isdigit(c));
+		} while ((c = lgetc(0)) != EOF && isdigit(c));
 		lungetc(c);
 		if (p == buf + 1 && buf[0] == '-')
 			goto nodigits;
@@ -496,7 +508,7 @@ nodigits:
 				yyerror("string too long");
 				return (findeol());
 			}
-		} while ((c = lgetc(fin)) != EOF && (allowed_in_string(c)));
+		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
 		lungetc(c);
 		*p = '\0';
 		if ((token = lookup(buf)) == STRING)