patch 8.2.2515: memory access error when truncating an empty message
Problem: Memory access error when truncating an empty message.
Solution: Check for an empty string. (Dominique Pellé, closes #7841)
diff --git a/src/message_test.c b/src/message_test.c
index 85a29b4..88335de 100644
--- a/src/message_test.c
+++ b/src/message_test.c
@@ -49,6 +49,15 @@
char_u *buf; /*allocated every time to find uninit errors */
char_u *s;
+ // Should not write anything to destination if buflen is 0.
+ trunc_string((char_u *)"", NULL, 1, 0);
+
+ // Truncating an empty string does nothing.
+ buf = alloc(1);
+ trunc_string((char_u *)"", buf, 1, 1);
+ assert(buf[0] == NUL);
+ vim_free(buf);
+
// in place
buf = alloc(40);
STRCPY(buf, "text");