parser: permit only ASCII characters in input

Report an error if any input byte is not an ASCII character.

Signed-off-by: Alex Elder <elder@linaro.org>
Message-Id: <20211001232338.769309-10-elder@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/parser.c b/parser.c
index 788129f..352b5d0 100644
--- a/parser.c
+++ b/parser.c
@@ -87,6 +87,8 @@ static char input()
 	input_len = ret;
 
 	ch = input_buf[input_pos++];
+	if (!isascii(ch))
+		yyerror("invalid non-ASCII character");
 out:
 	if (ch == '\n')
 		yyline++;