mandoc: Make sure that mandoc only goes into UTF-8 mode if the user

[schwarze@mandoc.bsd.lv]

Log Message:
-----------
Make sure that mandoc only goes into UTF-8 mode if the user really
selected UTF-8, not some other multibyte locale.  This obviously
makes no difference on OpenBSD but improves portability.
Issue reported by <Nakayama at NetBSD> via wiz@.

Modified Files:
--------------
    mandoc:
        term_ascii.c

Revision Data
-------------
Index: term_ascii.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/term_ascii.c,v
retrieving revision 1.59
retrieving revision 1.60
diff -Lterm_ascii.c -Lterm_ascii.c -u -p -r1.59 -r1.60
--- term_ascii.c
+++ term_ascii.c
@@ -1,7 +1,7 @@
 /*	$Id$ */
 /*
  * Copyright (c) 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
- * Copyright (c) 2014, 2015, 2017 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2014, 2015, 2017, 2018 Ingo Schwarze <schwarze@openbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -21,11 +21,13 @@
 
 #include <assert.h>
 #if HAVE_WCHAR
+#include <langinfo.h>
 #include <locale.h>
 #endif
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #if HAVE_WCHAR
 #include <wchar.h>
@@ -100,7 +102,17 @@ ascii_init(enum termenc enc, const struc
 		v = TERMENC_LOCALE == enc ?
 		    setlocale(LC_CTYPE, "") :
 		    setlocale(LC_CTYPE, UTF8_LOCALE);
-		if (NULL != v && MB_CUR_MAX > 1) {
+
+		/*
+		 * We only support UTF-8,
+		 * so revert to ASCII for anything else.
+		 */
+
+		if (v != NULL &&
+		    strcmp(nl_langinfo(CODESET), "UTF-8") != 0)
+			v = setlocale(LC_CTYPE, "C");
+
+		if (v != NULL && MB_CUR_MAX > 1) {
 			p->enc = enc;
 			p->advance = locale_advance;
 			p->endline = locale_endline;
--
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