diff --git a/Build.sh b/Build.sh
index 9c4bfdc..16a44bf 100644
--- a/Build.sh
+++ b/Build.sh
@@ -1,8 +1,8 @@
 #!/bin/sh
-srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.654 2013/12/02 19:47:33 tg Exp $'
+srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.655 2014/01/05 21:57:21 tg Exp $'
 #-
 # Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
-#		2011, 2012, 2013
+#		2011, 2012, 2013, 2014
 #	Thorsten Glaser <tg@mirbsd.org>
 #
 # Provided that these terms and disclaimer and all copyright notices
@@ -340,8 +340,9 @@ ac_testn() {
 ac_ifcpp() {
 	expr=$1; shift
 	ac_testn "$@" <<-EOF
+		#include <unistd.h>
 		extern int thiswillneverbedefinedIhope(void);
-		int main(void) { return (
+		int main(void) { return (isatty(0) +
 		#$expr
 		    0
 		#else
@@ -398,7 +399,8 @@ ac_flags() {
 	else
 		ac_testn can_$vn '' "$ft" <<-'EOF'
 			/* evil apo'stroph in comment test */
-			int main(void) { return (0); }
+			#include <unistd.h>
+			int main(void) { return (isatty(0)); }
 		EOF
 	fi
 	eval fv=\$HAVE_CAN_`upper $vn`
@@ -438,19 +440,14 @@ ac_header() {
 		esac
 	done
 	echo "#include <$hf>" >>x
-	echo 'int main(void) { return (0); }' >>x
+	echo '#include <unistd.h>' >>x
+	echo 'int main(void) { return (isatty(0)); }' >>x
 	ac_testn "$hv" "" "<$hf>" <x
 	rmf x
 	test 1 = $na || ac_cppflags
 }
 
 addsrcs() {
-	addsrcs_s=0
-	if test x"$1" = x"-s"; then
-		# optstatic
-		addsrcs_s=1
-		shift
-	fi
 	if test x"$1" = x"!"; then
 		fr=0
 		shift
@@ -458,13 +455,6 @@ addsrcs() {
 		fr=1
 	fi
 	eval i=\$$1
-	if test $addsrcs_s = 1; then
-		if test -f "$2" || test -f "$srcdir/$2"; then
-			# always add $2, since it exists
-			fr=1
-			i=1
-		fi
-	fi
 	test $fr = "$i" && case " $SRCS " in
 	*\ $2\ *)	;;
 	*)		SRCS="$SRCS $2" ;;
@@ -1069,7 +1059,10 @@ vv ']' "$CPP $CFLAGS $CPPFLAGS $NOWARN conftest.c | \
 sed 's/^/[ /' x
 eval `cat x`
 rmf x vv.out
-echo 'int main(void) { return (0); }' >conftest.c
+cat >conftest.c <<'EOF'
+#include <unistd.h>
+int main(void) { return (isatty(0)); }
+EOF
 case $ct in
 ack)
 	# work around "the famous ACK const bug"
@@ -1255,13 +1248,15 @@ if ac_ifcpp 'if 0' compiler_fails '' \
 	dec)
 		CFLAGS="$CFLAGS ${ccpl}-non_shared"
 		ac_testn can_delexe compiler_fails 0 'for the -non_shared linker option' <<-EOF
-			int main(void) { return (0); }
+			#include <unistd.h>
+			int main(void) { return (isatty(0)); }
 		EOF
 		;;
 	dmc)
 		CFLAGS="$CFLAGS ${ccpl}/DELEXECUTABLE"
 		ac_testn can_delexe compiler_fails 0 'for the /DELEXECUTABLE linker option' <<-EOF
-			int main(void) { return (0); }
+			#include <unistd.h>
+			int main(void) { return (isatty(0)); }
 		EOF
 		;;
 	*)
@@ -1357,7 +1352,8 @@ kencc|tcc|tendra)
 	;;
 sunpro)
 	cat >x <<-'EOF'
-		int main(void) { return (0); }
+		#include <unistd.h>
+		int main(void) { return (isatty(0)); }
 		#define __IDSTRING_CONCAT(l,p)	__LINTED__ ## l ## _ ## p
 		#define __IDSTRING_EXPAND(l,p)	__IDSTRING_CONCAT(l,p)
 		#define pad			void __IDSTRING_EXPAND(__LINE__,x)(void) { }
@@ -1560,14 +1556,29 @@ ac_test attribute_noreturn '' 'for __attribute__((__noreturn__))' <<-'EOF'
 	void fnord(void) { exit(0); }
 	#endif
 EOF
+ac_test attribute_pure '' 'for __attribute__((__pure__))' <<-'EOF'
+	#if defined(__TenDRA__) || (defined(__GNUC__) && (__GNUC__ < 2))
+	extern int thiswillneverbedefinedIhope(void);
+	/* force a failure: TenDRA and gcc 1.42 have false positive here */
+	int main(void) { return (thiswillneverbedefinedIhope()); }
+	#else
+	#include <unistd.h>
+	#undef __attribute__
+	int foo(const char *) __attribute__((__pure__));
+	int main(int ac, char **av) { return (foo(av[ac - 1]) + isatty(0)); }
+	int foo(const char *s) { return ((int)s[0]); }
+	#endif
+EOF
 ac_test attribute_unused '' 'for __attribute__((__unused__))' <<-'EOF'
 	#if defined(__TenDRA__) || (defined(__GNUC__) && (__GNUC__ < 2))
 	extern int thiswillneverbedefinedIhope(void);
 	/* force a failure: TenDRA and gcc 1.42 have false positive here */
 	int main(void) { return (thiswillneverbedefinedIhope()); }
 	#else
+	#include <unistd.h>
+	#undef __attribute__
 	int main(int ac __attribute__((__unused__)), char **av
-	    __attribute__((__unused__))) { return (0); }
+	    __attribute__((__unused__))) { return (isatty(0)); }
 	#endif
 EOF
 ac_test attribute_used '' 'for __attribute__((__used__))' <<-'EOF'
@@ -1576,8 +1587,10 @@ ac_test attribute_used '' 'for __attribute__((__used__))' <<-'EOF'
 	/* force a failure: TenDRA and gcc 1.42 have false positive here */
 	int main(void) { return (thiswillneverbedefinedIhope()); }
 	#else
+	#include <unistd.h>
+	#undef __attribute__
 	static const char fnord[] __attribute__((__used__)) = "42";
-	int main(void) { return (0); }
+	int main(void) { return (isatty(0)); }
 	#endif
 EOF
 
@@ -1629,7 +1642,8 @@ ac_test both_time_h '' 'whether <sys/time.h> and <time.h> can both be included'
 	#include <sys/types.h>
 	#include <sys/time.h>
 	#include <time.h>
-	int main(void) { struct tm tm; return ((int)sizeof(tm)); }
+	#include <unistd.h>
+	int main(void) { struct tm tm; return ((int)sizeof(tm) + isatty(0)); }
 EOF
 ac_header sys/bsdtypes.h
 ac_header sys/file.h sys/types.h
@@ -1655,11 +1669,12 @@ ac_header values.h
 # Environment: definitions
 #
 echo '#include <sys/types.h>
+#include <unistd.h>
 /* check that off_t can represent 2^63-1 correctly, thx FSF */
 #define LARGE_OFF_T (((off_t)1 << 62) - 1 + ((off_t)1 << 62))
 int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721 &&
     LARGE_OFF_T % 2147483647 == 1) ? 1 : -1];
-int main(void) { return (0); }' >lft.c
+int main(void) { return (isatty(0)); }' >lft.c
 ac_testn can_lfs '' "for large file support" <lft.c
 save_CPPFLAGS=$CPPFLAGS
 add_cppflags -D_FILE_OFFSET_BITS=64
@@ -1710,7 +1725,7 @@ ac_test rlim_t <<-'EOF'
 	#include <sys/resource.h>
 	#endif
 	#include <unistd.h>
-	int main(void) { return ((int)(rlim_t)0); }
+	int main(void) { return (((int)(rlim_t)0) + isatty(0)); }
 EOF
 
 # only testn: added later below
@@ -1762,8 +1777,8 @@ else
 		#define EXTERN
 		#define MKSH_INCLUDES_ONLY
 		#include "sh.h"
-		__RCSID("$MirOS: src/bin/mksh/Build.sh,v 1.654 2013/12/02 19:47:33 tg Exp $");
-		int main(void) { printf("Hello, World!\n"); return (0); }
+		__RCSID("$MirOS: src/bin/mksh/Build.sh,v 1.655 2014/01/05 21:57:21 tg Exp $");
+		int main(void) { printf("Hello, World!\n"); return (isatty(0)); }
 EOF
 	case $cm in
 	llvm)
@@ -1802,12 +1817,14 @@ test x"NetBSD" = x"$TARGET_OS" && $e Ignore the compatibility warning.
 ac_testn sys_errlist '' "the sys_errlist[] array and sys_nerr" <<-'EOF'
 	extern const int sys_nerr;
 	extern const char * const sys_errlist[];
-	int main(void) { return (*sys_errlist[sys_nerr - 1]); }
+	extern int isatty(int);
+	int main(void) { return (*sys_errlist[sys_nerr - 1] + isatty(0)); }
 EOF
 ac_testn _sys_errlist '!' sys_errlist 0 "the _sys_errlist[] array and _sys_nerr" <<-'EOF'
 	extern const int _sys_nerr;
 	extern const char * const _sys_errlist[];
-	int main(void) { return (*_sys_errlist[_sys_nerr - 1]); }
+	extern int isatty(int);
+	int main(void) { return (*_sys_errlist[_sys_nerr - 1] + isatty(0)); }
 EOF
 if test 1 = "$HAVE__SYS_ERRLIST"; then
 	add_cppflags -Dsys_nerr=_sys_nerr
@@ -1820,11 +1837,13 @@ for what in name list; do
 	uwhat=`upper $what`
 	ac_testn sys_sig$what '' "the sys_sig${what}[] array" <<-EOF
 		extern const char * const sys_sig${what}[];
-		int main(void) { return (sys_sig${what}[0][0]); }
+		extern int isatty(int);
+		int main(void) { return (sys_sig${what}[0][0] + isatty(0)); }
 	EOF
 	ac_testn _sys_sig$what '!' sys_sig$what 0 "the _sys_sig${what}[] array" <<-EOF
 		extern const char * const _sys_sig${what}[];
-		int main(void) { return (_sys_sig${what}[0][0]); }
+		extern int isatty(int);
+		int main(void) { return (_sys_sig${what}[0][0] + isatty(0)); }
 	EOF
 	eval uwhat_v=\$HAVE__SYS_SIG$uwhat
 	if test 1 = "$uwhat_v"; then
@@ -1891,7 +1910,7 @@ ac_test memmove <<-'EOF'
 	#include <strings.h>
 	#endif
 	int main(int ac, char *av[]) {
-		return (*(int *)(void *)memmove(av[0], av[1], ac));
+		return (*(int *)(void *)memmove(av[0], av[1], (size_t)ac));
 	}
 EOF
 
@@ -2063,12 +2082,12 @@ EOF
 ac_test sys_errlist_decl sys_errlist 0 "for declaration of sys_errlist[] and sys_nerr" <<-'EOF'
 	#define MKSH_INCLUDES_ONLY
 	#include "sh.h"
-	int main(void) { return (*sys_errlist[sys_nerr - 1]); }
+	int main(void) { return (*sys_errlist[sys_nerr - 1] + isatty(0)); }
 EOF
 ac_test sys_siglist_decl sys_siglist 0 'for declaration of sys_siglist[]' <<-'EOF'
 	#define MKSH_INCLUDES_ONLY
 	#include "sh.h"
-	int main(void) { return (sys_siglist[0][0]); }
+	int main(void) { return (sys_siglist[0][0] + isatty(0)); }
 EOF
 
 #
@@ -2139,7 +2158,7 @@ cta(ptr_fits_in_long, sizeof(ptrdiff_t) <= sizeof(long));
 		char padding[64 - NUM];
 	};
 char ctasserts_dblcheck[sizeof(struct ctasserts) == 64 ? 1 : -1];
-	int main(void) { return (sizeof(ctasserts_dblcheck)); }
+	int main(void) { return (sizeof(ctasserts_dblcheck) + isatty(0)); }
 EOF
 CFLAGS=$save_CFLAGS
 eval test 1 = \$HAVE_COMPILE_TIME_ASSERTS_$$ || exit 1
@@ -2277,12 +2296,11 @@ mksh_cfg= NSIG
 	$e done.
 fi
 
-addsrcs -s '!' HAVE_STRLCPY strlcpy.c
+addsrcs '!' HAVE_STRLCPY strlcpy.c
 addsrcs USE_PRINTF_BUILTIN printf.c
 test 1 = "$USE_PRINTF_BUILTIN" && add_cppflags -DMKSH_PRINTF_BUILTIN
 test 1 = "$HAVE_CAN_VERB" && CFLAGS="$CFLAGS -verbose"
-test -n "$LDSTATIC" && add_cppflags -DMKSH_OPTSTATIC
-add_cppflags -DMKSH_BUILD_R=489
+add_cppflags -DMKSH_BUILD_R=491
 
 $e $bi$me: Finished configuration testing, now producing output.$ao
 
diff --git a/Makefile b/Makefile
index fafb5d1..08e68d3 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
-# $MirOS: src/bin/mksh/Makefile,v 1.130 2013/11/30 17:41:32 tg Exp $
+# $MirOS: src/bin/mksh/Makefile,v 1.131 2014/01/05 21:57:22 tg Exp $
 #-
 # Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
-#		2011, 2012, 2013
+#		2011, 2012, 2013, 2014
 #	Thorsten Glaser <tg@mirbsd.org>
 #
 # Provided that these terms and disclaimer and all copyright notices
@@ -34,10 +34,11 @@ SRCS=		edit.c eval.c exec.c expr.c funcs.c histrap.c jobs.c \
 .if !make(test-build)
 CPPFLAGS+=	-DMKSH_ASSUME_UTF8 -DMKSH_DISABLE_DEPRECATED \
 		-DHAVE_ATTRIBUTE_BOUNDED=1 -DHAVE_ATTRIBUTE_FORMAT=1 \
-		-DHAVE_ATTRIBUTE_NORETURN=1 -DHAVE_ATTRIBUTE_UNUSED=1 \
-		-DHAVE_ATTRIBUTE_USED=1 -DHAVE_SYS_TIME_H=1 -DHAVE_TIME_H=1 \
-		-DHAVE_BOTH_TIME_H=1 -DHAVE_SYS_BSDTYPES_H=0 \
-		-DHAVE_SYS_FILE_H=1 -DHAVE_SYS_MKDEV_H=0 -DHAVE_SYS_MMAN_H=1 \
+		-DHAVE_ATTRIBUTE_NORETURN=1 -DHAVE_ATTRIBUTE_PURE=1 \
+		-DHAVE_ATTRIBUTE_UNUSED=1 -DHAVE_ATTRIBUTE_USED=1 \
+		-DHAVE_SYS_TIME_H=1 -DHAVE_TIME_H=1 -DHAVE_BOTH_TIME_H=1 \
+		-DHAVE_SYS_BSDTYPES_H=0 -DHAVE_SYS_FILE_H=1 \
+		-DHAVE_SYS_MKDEV_H=0 -DHAVE_SYS_MMAN_H=1 \
 		-DHAVE_SYS_PARAM_H=1 -DHAVE_SYS_RESOURCE_H=1 \
 		-DHAVE_SYS_SELECT_H=1 -DHAVE_SYS_SYSMACROS_H=0 \
 		-DHAVE_BSTRING_H=0 -DHAVE_GRP_H=1 -DHAVE_LIBGEN_H=1 \
@@ -54,7 +55,7 @@ CPPFLAGS+=	-DMKSH_ASSUME_UTF8 -DMKSH_DISABLE_DEPRECATED \
 		-DHAVE_SETGROUPS=1 -DHAVE_STRERROR=0 -DHAVE_STRSIGNAL=0 \
 		-DHAVE_STRLCPY=1 -DHAVE_FLOCK_DECL=1 -DHAVE_REVOKE_DECL=1 \
 		-DHAVE_SYS_ERRLIST_DECL=1 -DHAVE_SYS_SIGLIST_DECL=1 \
-		-DHAVE_PERSISTENT_HISTORY=1 -DMKSH_BUILD_R=489
+		-DHAVE_PERSISTENT_HISTORY=1 -DMKSH_BUILD_R=491
 CPPFLAGS+=	-D${${PROG:L}_tf:C/(Mir${MAN:E}{0,1}){2}/4/:S/x/mksh_BUILD/:U}
 CPPFLAGS+=	-I.
 COPTS+=		-std=c99 -Wall
diff --git a/check.t b/check.t
index 1ffcc1f..61f1ad1 100644
--- a/check.t
+++ b/check.t
@@ -1,8 +1,8 @@
-# $MirOS: src/bin/mksh/check.t,v 1.638 2013/12/15 15:45:31 tg Exp $
+# $MirOS: src/bin/mksh/check.t,v 1.639 2014/01/05 21:57:22 tg Exp $
 # OpenBSD src/regress/bin/ksh updated: 2013/12/02 20:39:44
 #-
 # Copyright © 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
-#	      2011, 2012, 2013
+#	      2011, 2012, 2013, 2014
 #	Thorsten Glaser <tg@mirbsd.org>
 #
 # Provided that these terms and disclaimer and all copyright notices
@@ -27,7 +27,7 @@
 # http://www.freebsd.org/cgi/cvsweb.cgi/src/tools/regression/bin/test/regress.sh?rev=HEAD
 
 expected-stdout:
-	@(#)MIRBSD KSH R48 2013/11/30
+	@(#)MIRBSD KSH R49 2014/01/05
 description:
 	Check version of shell.
 stdin:
@@ -36,7 +36,7 @@ name: KSH_VERSION
 category: shell:legacy-no
 ---
 expected-stdout:
-	@(#)LEGACY KSH R48 2013/11/30
+	@(#)LEGACY KSH R49 2014/01/05
 description:
 	Check version of legacy shell.
 stdin:
@@ -1636,6 +1636,14 @@ expected-stdout:
 	1=02.
 	2=02.
 ---
+name: expand-number-1
+description:
+	Check that positional arguments do not overflow
+stdin:
+	echo "1 ${12345678901234567890} ."
+expected-stdout:
+	1  .
+---
 name: eglob-bad-1
 description:
 	Check that globbing isn't done when glob has syntax error
diff --git a/edit.c b/edit.c
index a025d0f..2459db7 100644
--- a/edit.c
+++ b/edit.c
@@ -5,7 +5,7 @@
 
 /*-
  * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
- *		 2011, 2012, 2013
+ *		 2011, 2012, 2013, 2014
  *	Thorsten Glaser <tg@mirbsd.org>
  *
  * Provided that these terms and disclaimer and all copyright notices
@@ -28,7 +28,7 @@
 
 #ifndef MKSH_NO_CMDLINE_EDITING
 
-__RCSID("$MirOS: src/bin/mksh/edit.c,v 1.274 2014/01/05 19:11:43 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/edit.c,v 1.275 2014/01/05 21:57:24 tg Exp $");
 
 /*
  * in later versions we might use libtermcap for this, but since external
@@ -961,7 +961,7 @@ static void x_delete(size_t, bool);
 static size_t x_bword(void);
 static size_t x_fword(bool);
 static void x_goto(char *);
-static char *x_bs0(char *, char *);
+static char *x_bs0(char *, char *) MKSH_A_PURE;
 static void x_bs3(char **);
 static int x_size_str(char *);
 static int x_size2(char *, char **);
@@ -990,7 +990,7 @@ static int x_fold_case(int);
 #endif
 static char *x_lastcp(void);
 static void do_complete(int, Comp_type);
-static size_t x_nb2nc(size_t);
+static size_t x_nb2nc(size_t) MKSH_A_PURE;
 
 static int unget_char = -1;
 
@@ -3353,7 +3353,7 @@ static void save_cbuf(void);
 static void restore_cbuf(void);
 static int putbuf(const char *, ssize_t, bool);
 static void del_range(int, int);
-static int findch(int, int, bool, bool);
+static int findch(int, int, bool, bool) MKSH_A_PURE;
 static int forwword(int);
 static int backword(int);
 static int endword(int);
@@ -3763,10 +3763,10 @@ vi_hook(int ch)
 			refresh(0);
 			return (0);
 		} else if (ch == edchars.werase) {
-			int i, n = srchlen;
+			unsigned int i, n;
 			struct edstate new_es, *save_es;
 
-			new_es.cursor = n;
+			new_es.cursor = srchlen;
 			new_es.cbuf = locpat;
 
 			save_es = es;
@@ -3774,9 +3774,10 @@ vi_hook(int ch)
 			n = backword(1);
 			es = save_es;
 
-			for (i = srchlen; --i >= n; )
+			i = (unsigned)srchlen;
+			while (--i >= n)
 				es->linelen -= char_len(locpat[i]);
-			srchlen = n;
+			srchlen = (int)n;
 			es->cursor = es->linelen;
 			refresh(0);
 			return (0);
diff --git a/eval.c b/eval.c
index 23a8544..4d75e32 100644
--- a/eval.c
+++ b/eval.c
@@ -2,7 +2,7 @@
 
 /*-
  * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
- *		 2011, 2012, 2013
+ *		 2011, 2012, 2013, 2014
  *	Thorsten Glaser <tg@mirbsd.org>
  *
  * Provided that these terms and disclaimer and all copyright notices
@@ -23,7 +23,7 @@
 
 #include "sh.h"
 
-__RCSID("$MirOS: src/bin/mksh/eval.c,v 1.145 2013/11/30 00:20:47 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/eval.c,v 1.146 2014/01/05 21:57:25 tg Exp $");
 
 /*
  * string expansion
@@ -74,7 +74,7 @@ static const char *maybe_expand_tilde(const char *, XString *, char **, int);
 static char *homedir(char *);
 #endif
 static void alt_expand(XPtrV *, char *, char *, char *, int);
-static int utflen(const char *);
+static int utflen(const char *) MKSH_A_PURE;
 static void utfincptr(const char *, mksh_ari_t *);
 
 /* UTFMODE functions */
diff --git a/exec.c b/exec.c
index edba0dc..3b65309 100644
--- a/exec.c
+++ b/exec.c
@@ -2,7 +2,7 @@
 
 /*-
  * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
- *		 2011, 2012, 2013
+ *		 2011, 2012, 2013, 2014
  *	Thorsten Glaser <tg@mirbsd.org>
  *
  * Provided that these terms and disclaimer and all copyright notices
@@ -23,7 +23,7 @@
 
 #include "sh.h"
 
-__RCSID("$MirOS: src/bin/mksh/exec.c,v 1.127 2013/10/09 11:59:27 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/exec.c,v 1.128 2014/01/05 21:57:25 tg Exp $");
 
 #ifndef MKSH_DEFAULT_EXECSHELL
 #define MKSH_DEFAULT_EXECSHELL	"/bin/sh"
@@ -884,14 +884,14 @@ scriptexec(struct op *tp, const char **ap)
 		fd = (char *)cp - buf;		/* either 0 or (if BOM) 3 */
 
 		/* scan for newline (or CR) or NUL _before_ end of buffer */
-		while ((char *)cp < (buf + sizeof(buf)))
+		while ((size_t)((char *)cp - buf) < sizeof(buf))
 			if (*cp == '\0' || *cp == '\n' || *cp == '\r') {
 				*cp = '\0';
 				break;
 			} else
 				++cp;
 		/* if the shebang line is longer than MAXINTERP, bail out */
-		if ((char *)cp >= (buf + sizeof(buf)))
+		if ((size_t)((char *)cp - buf) >= sizeof(buf))
 			goto noshebang;
 
 		/* restore begin of shebang position (buf+0 or buf+3) */
diff --git a/expr.c b/expr.c
index f404610..14186a4 100644
--- a/expr.c
+++ b/expr.c
@@ -2,7 +2,7 @@
 
 /*-
  * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
- *		 2011, 2012, 2013
+ *		 2011, 2012, 2013, 2014
  *	Thorsten Glaser <tg@mirbsd.org>
  *
  * Provided that these terms and disclaimer and all copyright notices
@@ -23,7 +23,7 @@
 
 #include "sh.h"
 
-__RCSID("$MirOS: src/bin/mksh/expr.c,v 1.74 2014/01/05 19:11:44 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/expr.c,v 1.75 2014/01/05 21:57:26 tg Exp $");
 
 /* the order of these enums is constrained by the order of opinfo[] */
 enum token {
@@ -916,7 +916,6 @@ ksh_access(const char *fn, int mode)
 	return (rv);
 }
 
-#ifndef MKSH_mirbsd_wcwidth
 /* From: X11/xc/programs/xterm/wcwidth.c,v 1.7 2013/11/30 23:20:03 tg Exp $ */
 
 struct mb_ucsrange {
@@ -925,7 +924,7 @@ struct mb_ucsrange {
 };
 
 static int mb_ucsbsearch(const struct mb_ucsrange arr[], size_t elems,
-    unsigned int val);
+    unsigned int val) MKSH_A_PURE;
 
 /*
  * Generated by MirOS: contrib/code/Snippets/eawparse,v 1.2 2013/11/30 13:45:17 tg Exp $
@@ -1190,4 +1189,3 @@ utf_wcwidth(unsigned int wc)
 		return (2);
 	return (1);
 }
-#endif
diff --git a/main.c b/main.c
index 8103dd9..8dc680a 100644
--- a/main.c
+++ b/main.c
@@ -5,7 +5,7 @@
 
 /*-
  * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
- *		 2011, 2012, 2013
+ *		 2011, 2012, 2013, 2014
  *	Thorsten Glaser <tg@mirbsd.org>
  *
  * Provided that these terms and disclaimer and all copyright notices
@@ -34,7 +34,7 @@
 #include <locale.h>
 #endif
 
-__RCSID("$MirOS: src/bin/mksh/main.c,v 1.274 2014/01/05 19:11:45 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/main.c,v 1.275 2014/01/05 21:57:26 tg Exp $");
 
 extern char **environ;
 
@@ -48,7 +48,6 @@ extern char **environ;
 
 static uint8_t isuc(const char *);
 static int main_init(int, const char *[], Source **, struct block **);
-uint32_t chvt_rndsetup(const void *, size_t);
 void chvt_reinit(void);
 static void reclaim(void);
 static void remove_temps(struct temp *);
@@ -542,11 +541,13 @@ main_init(int argc, const char *argv[], Source **sp, struct block **lp)
 #ifndef MKSH_ASSUME_UTF8
 			/* auto-detect from locale or environment */
 			utf_flag = 4;
-#elif MKSH_ASSUME_UTF8
+#else /* this may not be an #elif */
+#if MKSH_ASSUME_UTF8
 			utf_flag = 1;
 #else
 			/* always disable UTF-8 (for interactive) */
 			utf_flag = 0;
+#endif
 #endif
 		}
 #ifndef MKSH_NO_CMDLINE_EDITING
diff --git a/misc.c b/misc.c
index bac1cad..82d47d6 100644
--- a/misc.c
+++ b/misc.c
@@ -3,7 +3,7 @@
 
 /*-
  * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
- *		 2011, 2012, 2013
+ *		 2011, 2012, 2013, 2014
  *	Thorsten Glaser <tg@mirbsd.org>
  *
  * Provided that these terms and disclaimer and all copyright notices
@@ -30,7 +30,7 @@
 #include <grp.h>
 #endif
 
-__RCSID("$MirOS: src/bin/mksh/misc.c,v 1.218 2013/11/30 17:33:50 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/misc.c,v 1.219 2014/01/05 21:57:27 tg Exp $");
 
 #define KSH_CHVT_FLAG
 #ifdef MKSH_SMALL
@@ -49,10 +49,11 @@ __RCSID("$MirOS: src/bin/mksh/misc.c,v 1.218 2013/11/30 17:33:50 tg Exp $");
 unsigned char chtypes[UCHAR_MAX + 1];
 
 static const unsigned char *pat_scan(const unsigned char *,
-    const unsigned char *, bool);
+    const unsigned char *, bool) MKSH_A_PURE;
 static int do_gmatch(const unsigned char *, const unsigned char *,
-    const unsigned char *, const unsigned char *);
-static const unsigned char *cclass(const unsigned char *, unsigned char);
+    const unsigned char *, const unsigned char *) MKSH_A_PURE;
+static const unsigned char *cclass(const unsigned char *, unsigned char)
+    MKSH_A_PURE;
 #ifdef KSH_CHVT_CODE
 static void chvt(const Getopt *);
 #endif
@@ -1952,7 +1953,6 @@ c_cd(const char **wp)
 
 
 #ifdef KSH_CHVT_CODE
-extern uint32_t chvt_rndsetup(const void *, size_t);
 extern void chvt_reinit(void);
 
 static void
diff --git a/mksh.1 b/mksh.1
index 1d06486..5bd04d6 100644
--- a/mksh.1
+++ b/mksh.1
@@ -1,8 +1,8 @@
-.\" $MirOS: src/bin/mksh/mksh.1,v 1.327 2014/01/05 19:14:16 tg Exp $
+.\" $MirOS: src/bin/mksh/mksh.1,v 1.328 2014/01/05 21:57:27 tg Exp $
 .\" $OpenBSD: ksh.1,v 1.149 2013/12/18 13:53:11 millert Exp $
 .\"-
 .\" Copyright © 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
-.\"		2010, 2011, 2012, 2013
+.\"		2010, 2011, 2012, 2013, 2014
 .\"	Thorsten Glaser <tg@mirbsd.org>
 .\"
 .\" Provided that these terms and disclaimer and all copyright notices
@@ -371,7 +371,9 @@ The suid profile probably should run
 .Ic set +p
 unless the shell was explicitly started with
 .Fl p .
-This isn't easily implemented but a stopgap measure for:
+This isn't easily implemented but
+.Pq just always run Ic set +p
+a stopgap measure for:
 .Pa http://blog.cmpxchg8b.com/2013/08/security\-debianisms.html
 .Ss Command syntax
 The shell begins parsing its input by removing any backslash-newline
@@ -6447,7 +6449,7 @@ $ /bin/sleep 666 && echo fubar
 .Ed
 .Pp
 This document attempts to describe
-.Nm mksh\ R48+CVS
+.Nm mksh\ R49
 and up,
 compiled without any options impacting functionality, such as
 .Dv MKSH_SMALL ,
diff --git a/sh.h b/sh.h
index b49386a..ccc517a 100644
--- a/sh.h
+++ b/sh.h
@@ -10,7 +10,7 @@
 
 /*-
  * Copyright © 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
- *	       2011, 2012, 2013
+ *	       2011, 2012, 2013, 2014
  *	Thorsten Glaser <tg@mirbsd.org>
  *
  * Provided that these terms and disclaimer and all copyright notices
@@ -122,6 +122,11 @@
 #else
 #define MKSH_A_NORETURN		/* nothing */
 #endif
+#if HAVE_ATTRIBUTE_PURE
+#define MKSH_A_PURE		__attribute__((__pure__))
+#else
+#define MKSH_A_PURE		/* nothing */
+#endif
 #if HAVE_ATTRIBUTE_UNUSED
 #define MKSH_A_UNUSED		__attribute__((__unused__))
 #else
@@ -164,9 +169,9 @@
 #endif
 
 #ifdef EXTERN
-__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.681 2014/01/05 19:14:17 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.682 2014/01/05 21:57:28 tg Exp $");
 #endif
-#define MKSH_VERSION "R48 2013/11/30"
+#define MKSH_VERSION "R49 2014/01/05"
 
 /* arithmetic types: C implementation */
 #if !HAVE_CAN_INTTYPES
@@ -298,7 +303,7 @@ struct rusage {
 #define ksh_isupper(c)	(((c) >= 'A') && ((c) <= 'Z'))
 #define ksh_tolower(c)	(((c) >= 'A') && ((c) <= 'Z') ? (c) - 'A' + 'a' : (c))
 #define ksh_toupper(c)	(((c) >= 'a') && ((c) <= 'z') ? (c) - 'a' + 'A' : (c))
-#define ksh_isdash(s)	(((s) != NULL) && ((s)[0] == '-') && ((s)[1] == '\0'))
+#define ksh_isdash(s)	(((s)[0] == '-') && ((s)[1] == '\0'))
 #define ksh_isspace(c)	((((c) >= 0x09) && ((c) <= 0x0D)) || ((c) == 0x20))
 #define ksh_min(x,y)	((x) < (y) ? (x) : (y))
 #define ksh_max(x,y)	((x) > (y) ? (x) : (y))
@@ -422,14 +427,6 @@ extern int __cdecl setegid(gid_t);
 #define ISTRIP		0
 #endif
 
-/* remove redundancies */
-
-#if defined(MirBSD) && (MirBSD >= 0x0AB5) && !defined(MKSH_OPTSTATIC)
-#define MKSH_mirbsd_wcwidth
-#define utf_wcwidth(i) wcwidth((__WCHAR_TYPE__)i)
-extern int wcwidth(__WCHAR_TYPE__);
-#endif
-
 
 /* some useful #defines */
 #ifdef EXTERN
@@ -526,7 +523,7 @@ char *ucstrstr(char *, const char *);
 #define mkssert(e)	do { } while (/* CONSTCOND */ 0)
 #endif
 
-#if (!defined(MKSH_BUILDMAKEFILE4BSD) && !defined(MKSH_BUILDSH)) || (MKSH_BUILD_R != 489)
+#if (!defined(MKSH_BUILDMAKEFILE4BSD) && !defined(MKSH_BUILDSH)) || (MKSH_BUILD_R != 491)
 #error Must run Build.sh to compile this.
 extern void thiswillneverbedefinedIhope(void);
 int
@@ -1434,7 +1431,7 @@ typedef char *XStringP;
 #define XcheckN(xs, xp, n) do {					\
 	ssize_t more = ((xp) + (n)) - (xs).end;			\
 	if (more > 0)						\
-		(xp) = Xcheck_grow(&(xs), (xp), more);		\
+		(xp) = Xcheck_grow(&(xs), (xp), (size_t)more);	\
 } while (/* CONSTCOND */ 0)
 
 /* check for overflow, expand string */
@@ -1715,12 +1712,10 @@ int v_evaluate(struct tbl *, const char *, volatile int, bool);
 size_t utf_mbtowc(unsigned int *, const char *);
 size_t utf_wctomb(char *, unsigned int);
 int utf_widthadj(const char *, const char **);
-size_t utf_mbswidth(const char *);
-const char *utf_skipcols(const char *, int);
-size_t utf_ptradj(const char *);
-#ifndef MKSH_mirbsd_wcwidth
-int utf_wcwidth(unsigned int);
-#endif
+size_t utf_mbswidth(const char *) MKSH_A_PURE;
+const char *utf_skipcols(const char *, int) MKSH_A_PURE;
+size_t utf_ptradj(const char *) MKSH_A_PURE;
+int utf_wcwidth(unsigned int) MKSH_A_PURE;
 int ksh_access(const char *, int);
 struct tbl *tempvar(void);
 /* funcs.c */
@@ -1788,10 +1783,10 @@ void sethistsize(mksh_ari_t);
 void sethistfile(const char *);
 #endif
 #if !defined(MKSH_NO_CMDLINE_EDITING) && !MKSH_S_NOVI
-char **histpos(void);
+char **histpos(void) MKSH_A_PURE;
 int histnum(int);
 #endif
-int findhist(int, int, const char *, bool);
+int findhist(int, int, const char *, bool) MKSH_A_PURE;
 char **hist_get_newest(bool);
 void inittraps(void);
 void alarm_init(void);
@@ -1904,18 +1899,19 @@ struct tbl **ktsort(struct table *);
 void DF(const char *, ...)
     MKSH_A_FORMAT(__printf__, 1, 2);
 #endif
+uint32_t chvt_rndsetup(const void *, size_t) MKSH_A_PURE;
 /* misc.c */
 void setctypes(const char *, int);
 void initctypes(void);
-size_t option(const char *);
+size_t option(const char *) MKSH_A_PURE;
 char *getoptions(void);
 void change_flag(enum sh_flag, int, bool);
 void change_xtrace(unsigned char, bool);
 int parse_args(const char **, int, bool *);
 int getn(const char *, int *);
 int gmatchx(const char *, const char *, bool);
-int has_globbing(const char *, const char *);
-int xstrcmp(const void *, const void *);
+int has_globbing(const char *, const char *) MKSH_A_PURE;
+int xstrcmp(const void *, const void *) MKSH_A_PURE;
 void ksh_getopt_reset(Getopt *, int);
 int ksh_getopt(const char **, Getopt *, const char *);
 void print_value_quoted(struct shf *, const char *);
@@ -2007,17 +2003,17 @@ void setint(struct tbl *, mksh_ari_t);
 void setint_n(struct tbl *, mksh_ari_t, int);
 struct tbl *typeset(const char *, uint32_t, uint32_t, int, int);
 void unset(struct tbl *, int);
-const char *skip_varname(const char *, int);
-const char *skip_wdvarname(const char *, bool);
-int is_wdvarname(const char *, bool);
-int is_wdvarassign(const char *);
+const char *skip_varname(const char *, int) MKSH_A_PURE;
+const char *skip_wdvarname(const char *, bool) MKSH_A_PURE;
+int is_wdvarname(const char *, bool) MKSH_A_PURE;
+int is_wdvarassign(const char *) MKSH_A_PURE;
 struct tbl *arraysearch(struct tbl *, uint32_t);
 char **makenv(void);
 void change_winsz(void);
-size_t array_ref_len(const char *);
+size_t array_ref_len(const char *) MKSH_A_PURE;
 char *arrayname(const char *);
 mksh_uari_t set_array(const char *, bool, const char **);
-uint32_t hash(const void *);
+uint32_t hash(const void *) MKSH_A_PURE;
 mksh_ari_t rndget(void);
 void rndset(unsigned long);
 
@@ -2070,7 +2066,7 @@ typedef struct test_env {
 
 extern const char * const dbtest_tokens[];
 
-Test_op	test_isop(Test_meta, const char *);
+Test_op	test_isop(Test_meta, const char *) MKSH_A_PURE;
 int test_eval(Test_env *, Test_op, const char *, const char *, bool);
 int test_parse(Test_env *);
 
diff --git a/syn.c b/syn.c
index 58387d9..6a544df 100644
--- a/syn.c
+++ b/syn.c
@@ -2,7 +2,7 @@
 
 /*-
  * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009,
- *		 2011, 2012, 2013
+ *		 2011, 2012, 2013, 2014
  *	Thorsten Glaser <tg@mirbsd.org>
  *
  * Provided that these terms and disclaimer and all copyright notices
@@ -23,7 +23,7 @@
 
 #include "sh.h"
 
-__RCSID("$MirOS: src/bin/mksh/syn.c,v 1.93 2013/09/10 16:30:50 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/syn.c,v 1.94 2014/01/05 21:57:29 tg Exp $");
 
 struct nesting_state {
 	int start_token;	/* token than began nesting (eg, FOR) */
@@ -59,7 +59,7 @@ static void syntaxerr(const char *) MKSH_A_NORETURN;
 static void nesting_push(struct nesting_state *, int);
 static void nesting_pop(struct nesting_state *);
 static int assign_command(const char *);
-static int inalias(struct source *);
+static int inalias(struct source *) MKSH_A_PURE;
 static Test_op dbtestp_isa(Test_env *, Test_meta);
 static const char *dbtestp_getopnd(Test_env *, Test_op, bool);
 static int dbtestp_eval(Test_env *, Test_op, const char *,
diff --git a/var.c b/var.c
index fa006c4..2c51687 100644
--- a/var.c
+++ b/var.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: var.c,v 1.37 2013/12/18 13:53:12 millert Exp $	*/
+/*	$OpenBSD: var.c,v 1.38 2013/12/20 17:53:09 zhuk Exp $	*/
 
 /*-
  * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
@@ -27,7 +27,7 @@
 #include <sys/sysctl.h>
 #endif
 
-__RCSID("$MirOS: src/bin/mksh/var.c,v 1.175 2014/01/05 19:14:18 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/var.c,v 1.176 2014/01/05 21:57:29 tg Exp $");
 
 /*-
  * Variables
@@ -238,9 +238,7 @@ global(const char *n)
 		vp->areap = ATEMP;
 		*vp->name = c;
 		if (ksh_isdigit(c)) {
-			for (c = 0; ksh_isdigit(*n); n++)
-				c = (c * 10) + (*n - '0');
-			if (c <= l->argc)
+			if (getn(n, &c) && (c <= l->argc))
 				/* setstr can't fail here */
 				setstr(vp, l->argv[c], KSH_RETURN_ERROR);
 			vp->flag |= RDONLY;