fix spurious failures by fgetws when buffer ends with partial character

[musl] / src / string / stpncpy.c

diff --git a/src/string/stpncpy.c b/src/string/stpncpy.c
index d6d92ff..f57fa6b 100644 (file)
--- a/src/string/stpncpy.c
+++ b/src/string/stpncpy.c
@@ -9,9 +9,10 @@
 
 char *__stpncpy(char *restrict d, const char *restrict s, size_t n)
 {
-       size_t *wd;
-       const size_t *ws;
-
+#ifdef __GNUC__
+       typedef size_t __attribute__((__may_alias__)) word;
+       word *wd;
+       const word *ws;
        if (((uintptr_t)s & ALIGN) == ((uintptr_t)d & ALIGN)) {
                for (; ((uintptr_t)s & ALIGN) && n && (*d=*s); n--, s++, d++);
                if (!n || !*s) goto tail;
@@ -20,6 +21,7 @@ char *__stpncpy(char *restrict d, const char *restrict s, size_t n)
                       n-=sizeof(size_t), ws++, wd++) *wd = *ws;
                d=(void *)wd; s=(const void *)ws;
        }
+#endif
        for (; n && (*d=*s); n--, s++, d++);
 tail:
        memset(d, 0, n);