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, 18 deletions

diff --git a/src/fallback.h b/src/fallback.h
index e3044449..f3252c14 100644
--- a/src/fallback.h
+++ b/src/fallback.h
@@ -158,29 +158,13 @@ int vswprintf(wchar_t *out, size_t n, const wchar_t *filter, va_list va);
 #endif
 
 #ifndef HAVE_FGETWC
-/**
-   Fallback implementation of fgetwc
-*/
+// Fallback implementation of fgetwc.
 wint_t fgetwc(FILE *stream);
-
-/**
-   Fallback implementation of getwc
-*/
-wint_t getwc(FILE *stream);
-
 #endif
 
 #ifndef HAVE_FPUTWC
-
-/**
-   Fallback implementation of fputwc
-*/
+// Fallback implementation of fputwc.
 wint_t fputwc(wchar_t wc, FILE *stream);
-/**
-   Fallback implementation of putwc
-*/
-wint_t putwc(wchar_t wc, FILE *stream);
-
 #endif
 
 #ifndef HAVE_WCSTOK