From b0d65300b1f981bd9ee6cb6de0755b41b9cd23f6 Mon Sep 17 00:00:00 2001
From: ragge <ragge>
Date: Thu, 12 Mar 2009 20:19:43 +0000
Subject: Check if pushback buffer overflows. Tokens beginning with a digit may
 be an IDENT. Now seems to work as well as at least the old parser.

---
 token.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/token.c b/token.c
index 9ba2aeb..91f0655 100644
--- a/token.c
+++ b/token.c
@@ -82,18 +82,22 @@ static int state;
 #define	YYSTATE	state
 
 char yytext[CPPBUF];
+static int owasnl, wasnl = 1;
 
 static void
 unch(int c)
 {
-	*--ifiles->curptr = c;
+		
+	--ifiles->curptr;
+	if (ifiles->curptr < ifiles->bbuf)
+		error("pushback buffer full");
+	*ifiles->curptr = c;
 }
 
 
 int
 yylex()
 {
-	static int owasnl, wasnl = 1;
 	int ch;
 	int yyp;
 	int os, mixed, haspmd;
@@ -189,6 +193,9 @@ ppnum:		for (;;) {
 		unput(ch);
 		yytext[yyp] = 0;
 
+		if (mixed == 1 && slow && (state == 0 || state == DEF))
+			return IDENT;
+
 		if (mixed == 0) {
 			if (slow && !YYSTATE)
 				return IDENT;
@@ -711,6 +718,7 @@ pushfile(usch *file)
 	if ((c = yylex()) != 0)
 		error("yylex returned %d", c);
 
+wasnl = owasnl;
 	if (otrulvl != trulvl || flslvl)
 		error("unterminated conditional");
 
@@ -1134,7 +1142,8 @@ pragmastmt(void)
 		if (!flslvl)
 			putch(c);	/* Do arg expansion instead? */
 	} while (c && c != '\n');
-	ifiles->lineno++;
+	if (c == '\n')
+		unch(c);
 	prtline();
 	slow = 0;
 }
-- 
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