fix longstanding exit logic bugs in mbsnrtowcs and wcsnrtombs

[musl] / src / multibyte / mbsnrtowcs.c

diff --git a/src/multibyte/mbsnrtowcs.c b/src/multibyte/mbsnrtowcs.c
index c6f0207..f42e30d 100644 (file)
--- a/src/multibyte/mbsnrtowcs.c
+++ b/src/multibyte/mbsnrtowcs.c
@@ -47,6 +47,10 @@ size_t mbsnrtowcs(wchar_t *wcs, const char **src, size_t n, size_t wn, mbstate_t
                                cnt = l;
                                break;
                        }
+                       if (!l) {
+                               s = 0;
+                               break;
+                       }
                        /* have to roll back partial character */
                        *(unsigned *)st = 0;
                        break;