===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/mandoc/term_ascii.c,v
retrieving revision 1.37
retrieving revision 1.38
diff -c -r1.37 -r1.38
*** src/usr.bin/mandoc/term_ascii.c	2015/10/13 22:57:49	1.37
--- src/usr.bin/mandoc/term_ascii.c	2015/11/12 21:49:29	1.38
***************
*** 1,4 ****
! /*	$OpenBSD: term_ascii.c,v 1.37 2015/10/13 22:57:49 schwarze Exp $ */
  /*
   * Copyright (c) 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   * Copyright (c) 2014, 2015 Ingo Schwarze <schwarze@openbsd.org>
--- 1,4 ----
! /*	$OpenBSD: term_ascii.c,v 1.38 2015/11/12 21:49:29 schwarze Exp $ */
  /*
   * Copyright (c) 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   * Copyright (c) 2014, 2015 Ingo Schwarze <schwarze@openbsd.org>
***************
*** 77,84 ****
  	p->width = ascii_width;
  
  	if (TERMENC_ASCII != enc) {
  		v = TERMENC_LOCALE == enc ?
! 		    setlocale(LC_ALL, "") :
  		    setlocale(LC_CTYPE, "en_US.UTF-8");
  		if (NULL != v && MB_CUR_MAX > 1) {
  			p->enc = enc;
--- 77,92 ----
  	p->width = ascii_width;
  
  	if (TERMENC_ASCII != enc) {
+ 
+ 		/*
+ 		 * Do not change any of this to LC_ALL.  It might break
+ 		 * the formatting by subtly changing the behaviour of
+ 		 * various functions, for example strftime(3).  As a
+ 		 * worst case, it might even cause buffer overflows.
+ 		 */
+ 
  		v = TERMENC_LOCALE == enc ?
! 		    setlocale(LC_CTYPE, "") :
  		    setlocale(LC_CTYPE, "en_US.UTF-8");
  		if (NULL != v && MB_CUR_MAX > 1) {
  			p->enc = enc;