fix btowc corner case

btowc is required to interpret its argument by conversion to unsigned
char, unless the argument is equal to EOF. since the conversion to
produces a non-character value anyway, we can just unconditionally
convert, for now.

diff --git a/src/multibyte/btowc.c b/src/multibyte/btowc.c
index 9d2c3b16eb77a4e6df82c31bb4c56d517424a533..29cb798d2ce2a25cf2eb4e8b5079b80ebfe523a4 100644 (file)
--- a/src/multibyte/btowc.c
+++ b/src/multibyte/btowc.c
@@ -3,5 +3,6 @@
 
 wint_t btowc(int c)
 {
+       c = (unsigned char)c;
        return c<128U ? c : EOF;
 }