win32.c: pass through unknown sequence

* win32/win32.c (constat_apply): pass through unknown sequence which
  starts with ESC but is not followed by a bracket.  [ruby-core:53879]
  [Bug #8201]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40078 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 11 insertions, 1 deletions

diff --git a/win32/win32.c b/win32/win32.c
index 3ce6949779..cdac41b456 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -5787,9 +5787,19 @@ constat_parse(HANDLE h, struct constat *s, const WCHAR **ptrp, long *lenp)
 	WCHAR wc = *ptr++;
 	if (wc == 0x1b) {
 	    rest = *lenp - len - 1;
+	    if (s->vt100.state == constat_esc) {
+		rest++;		/* reuse this ESC */
+	    }
+	    s->vt100.state = constat_init;
+	    if (len > 0 && *ptr != L'[') continue;
 	    s->vt100.state = constat_esc;
 	}
-	else if (s->vt100.state == constat_esc && wc == L'[') {
+	else if (s->vt100.state == constat_esc) {
+	    if (wc != L'[') {
+		/* TODO: supply dropped ESC at beginning */
+		s->vt100.state = constat_init;
+		continue;
+	    }
 	    rest = *lenp - len - 1;
 	    if (rest > 0) --rest;
 	    s->vt100.state = constat_seq;