fix handling of non-ASCII chars in C locale

The relevant standards allow the mbtowc/mbrtowc functions to reject
non-ASCII characters (i.e., chars with the high bit set) when the locale
is C or POSIX.  The BSD libraries (e.g., on OS X) don't do this but
the GNU libraries (e.g., on Linux) do. Like most programs we need the
C/POSIX locales to allow arbitrary bytes. So explicitly check if we're
in a single-byte locale (which would also include ISO-8859 variants)
and simply pass-thru the chars without encoding or decoding.

Fixes #2802.

1 files changed, 2 insertions, 4 deletions

diff --git a/src/wutil.h b/src/wutil.h
index 9897439a..a14dfa9b 100644
--- a/src/wutil.h
+++ b/src/wutil.h
@@ -70,10 +70,8 @@ void safe_perror(const char *message);
 */
 const char *safe_strerror(int err);
 
-/**
-   Wide character version of getcwd().
-*/
-wchar_t *wgetcwd(wchar_t *buff, size_t sz);
+// Wide character version of getcwd().
+const wcstring wgetcwd();
 
 /**
    Wide character version of chdir()