optimize mbrtowc

[musl] / src / multibyte / mbrtowc.c

diff --git a/src/multibyte/mbrtowc.c b/src/multibyte/mbrtowc.c
index a354573..ec32385 100644 (file)
--- a/src/multibyte/mbrtowc.c
+++ b/src/multibyte/mbrtowc.c
@@ -11,7 +11,7 @@
 
 #include "internal.h"
 
-size_t mbrtowc(wchar_t *wc, const char *src, size_t n, mbstate_t *st)
+size_t mbrtowc(wchar_t *restrict wc, const char *restrict src, size_t n, mbstate_t *restrict st)
 {
        static unsigned internal_state;
        unsigned c;
@@ -22,9 +22,8 @@ size_t mbrtowc(wchar_t *wc, const char *src, size_t n, mbstate_t *st)
        c = *(unsigned *)st;
        
        if (!s) {
-               s = "";
-               wc = (void *)&wc;
-               n = 1;
+               if (c) goto ilseq;
+               return 0;
        } else if (!wc) wc = (void *)&wc;
 
        if (!n) return -2;