From a6392ef31cbfee50d5b7dfd17dbfbbf2f49484b8 Mon Sep 17 00:00:00 2001 From: Cody Peter Mello Date: Mon, 12 Nov 2018 10:25:44 -0800 Subject: [PATCH] Fix regular expressions containing [[:cntrl:]] --- b.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/b.c b/b.c index 89a7841..a54a234 100644 --- a/b.c +++ b/b.c @@ -823,7 +823,15 @@ int relex(void) /* lexical analyzer for reparse */ if (cc->cc_name != NULL && prestr[1 + cc->cc_namelen] == ':' && prestr[2 + cc->cc_namelen] == ']') { prestr += cc->cc_namelen + 3; - for (i = 0; i < NCHARS; i++) { + /* + * BUG: We begin at 1, instead of 0, since we + * would otherwise prematurely terminate the + * string for classes like [[:cntrl:]]. This + * means that we can't match the NUL character, + * not without first adapting the entire + * program to track each string's length. + */ + for (i = 1; i < NCHARS; i++) { if (!adjbuf((char **) &buf, &bufsz, bp-buf+1, 100, (char **) &bp, "relex2")) FATAL("out of space for reg expr %.10s...", lastre); if (cc->cc_func(i)) {