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eval: save_tv_as_string: Correctly handle an empty string

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When tv_get_string_chk returns a non-NULL value, we have a valid string.
Propagating an error state (*len = -1, NULL return) for an empty string
is invalid.

Closes #6554
This commit is contained in:
James McCoy
2018-01-23 17:56:50 -05:00
parent 15119f943a
commit 3ff92ba1ee
2 changed files with 5 additions and 1 deletions
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3
src/nvim/eval.c
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@@ -17504,7 +17504,8 @@ static char *save_tv_as_string(typval_T *tv, ptrdiff_t *const len, bool endnl)
// print an error.
if (tv->v_type != VAR_LIST && tv->v_type != VAR_NUMBER) {
const char *ret = tv_get_string_chk(tv);
if (ret && (*len = strlen(ret))) {
if (ret) {
*len = strlen(ret);
return xmemdupz(ret, (size_t)(*len));
} else {
*len = -1;