scanner: Disallow, overquote '[' and ']' in prefix

1 files changed, 2 insertions, 0 deletions

diff --git a/src/main.c b/src/main.c
index 0c0e360..ef804cd 100644
--- a/src/main.c
+++ b/src/main.c
@@ -445,6 +445,8 @@ void check_options (void)
 	if ( bison_bridge_lloc)
         buf_m4_define (&m4defs_buf, "<M4_YY_BISON_LLOC>", NULL);
 
+    if (strchr(prefix, '[') || strchr(prefix, ']'))
+        flexerror(_("Prefix cannot include '[' or ']'"));
     buf_m4_define(&m4defs_buf, "M4_YY_PREFIX", prefix);
 
 	if (did_outfilename)