iris

commit 061ae0fa9528d4aa417c0eb339401ab582b28729
parent 6d4badd37658db4818e537e6f60f5eaf32fe0d58
Author: sin <sin@2f30.org>
Date:   Sun, 11 May 2014 16:29:12 +0100

Guard against overwriting the internal lexer buffer

Diffstat:
M
lexer.c
 | 
8
+++++++-

1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/lexer.c b/lexer.c
@@ -58,7 +58,7 @@ gettok(FILE *in)
 again:
 	state = State_Se;
 	s = e = buf;
-	while ((c = getc(in)) != EOF) {
+	while ((c = getc(in)) != EOF && e < &buf[MAXTOKSIZE]) {
 		*e = c;
 		switch (state) {
 		case State_Se:
@@ -223,6 +223,12 @@ again:
 		}
 		e++;
 	}
+	if (e == &buf[MAXTOKSIZE]) {
+		tok.type = Error;
+		tok.s = "reached the maximum token size";
+		tok.e = NULL;
+		return tok;
+	}
 	tok.type = Eof;
 	tok.s = "reached the end-of-file";
 	tok.e = NULL;