patch 8.2.2117: some functions use any value as a string
Problem: Some functions use any value as a string.
Solution: Check that the value is a non-empty string.
diff --git a/src/typval.c b/src/typval.c
index 0e2513a..64112e7 100644
--- a/src/typval.c
+++ b/src/typval.c
@@ -341,6 +341,22 @@
#endif
/*
+ * Give an error and return FAIL unless "tv" is a non-empty string.
+ */
+ int
+check_for_string(typval_T *tv)
+{
+ if (tv->v_type != VAR_STRING
+ || tv->vval.v_string == NULL
+ || *tv->vval.v_string == NUL)
+ {
+ emsg(_(e_stringreq));
+ return FAIL;
+ }
+ return OK;
+}
+
+/*
* Get the string value of a variable.
* If it is a Number variable, the number is converted into a string.
* tv_get_string() uses a single, static buffer. YOU CAN ONLY USE IT ONCE!