1 files changed, 4 insertions, 1 deletions

diff --git a/txt.c b/txt.c
index a7bf447..7d86f25 100644
--- a/txt.c
+++ b/txt.c
@@ -132,6 +132,7 @@ loop:
 }
 
 TxtLoc txt_insert(TxtLoc l, const char *s, u32 n) {
+	if (l.t->readonly) return l;
 	l = txt_add_piece(l);
 	TxtPiece *p = &l.t->ptbl.v[l.p];
 	isize ext = txt_buf_dedup(l.t, p->buf, s, n);
@@ -147,6 +148,7 @@ TxtLoc txt_insert(TxtLoc l, const char *s, u32 n) {
 }
 
 TxtLoc txt_delete(TxtLoc l, u32 n) {
+	if (l.t->readonly) return l;
 	l = txt_split_piece(l);
 	while (n > 0) {
 		TxtPiece *p = &l.t->ptbl.v[l.p];
@@ -193,6 +195,7 @@ TxtLoc txt_delete_range(TxtLoc lo, TxtLoc hi) {
 }
 
 TxtLoc txt_delete_c(TxtLoc l) {
+	if (l.t->readonly) return l;
 	while (!at_start(l) && (txt_byte(bprev(l)) & 0xc0) == 0x80)
 		l = txt_delete(l, 1);
 	l = txt_delete(l, 1);
@@ -274,7 +277,7 @@ void txt_hist_push(Txt *t, TxtLoc cur) {
 		return;
 	}
 	if (t->hist.i + 1 < t->hist.n) t->hist.n = t->hist.i + 1;
-	if (t->hist.n == TXT_HIST_MAX) {
+	if (t->hist.i + 1 == TXT_HIST_MAX) {
 		free(t->hist.v[0].v);
 		MOVE(&t->hist.v[0], &t->hist.v[1], TXT_HIST_MAX - 1);
 		t->hist.i--;