3 files changed, 7 insertions, 2 deletions
diff --git a/ChangeLog b/ChangeLog
index cedd63fe..d92e23af 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2014-09-27         Arnold D. Robbins     <arnold@skeeve.com>
+
+	* awkgram.y (check_for_bad): Bitwise-and the bad character with 0xFF
+	to avoid sign extension into a large integer.
+
 2014-09-23         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* awkgram.y (yylex): Don't check for junk characters inside
diff --git a/awkgram.c b/awkgram.c
index 06279861..63439b36 100644
--- a/awkgram.c
+++ b/awkgram.c
@@ -5154,7 +5154,7 @@ check_bad_char(int c)
 	}
 
 	if (iscntrl(c) && ! isspace(c))
-		fatal(_("PEBKAC error: invalid character '\\%03o' in source code"), c);
+		fatal(_("PEBKAC error: invalid character '\\%03o' in source code"), c & 0xFF);
 }
 
 /* nextc --- get the next input character */
diff --git a/awkgram.y b/awkgram.y
index 57d97098..c59547eb 100644
--- a/awkgram.y
+++ b/awkgram.y
@@ -2815,7 +2815,7 @@ check_bad_char(int c)
 	}
 
 	if (iscntrl(c) && ! isspace(c))
-		fatal(_("PEBKAC error: invalid character '\\%03o' in source code"), c);
+		fatal(_("PEBKAC error: invalid character '\\%03o' in source code"), c & 0xFF);
 }
 
 /* nextc --- get the next input character */