fuck POSIX

check.t

@@ -1,4 +1,4 @@
-# $MirOS: src/bin/mksh/check.t,v 1.794 2017/07/26 23:02:23 tg Exp $
+# $MirOS: src/bin/mksh/check.t,v 1.795 2017/08/07 21:16:29 tg Exp $
 # -*- mode: sh -*-
 #-
 # Copyright © 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
@@ -30,7 +30,7 @@
 # (2013/12/02 20:39:44) http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/regress/bin/ksh/?sortby=date
 
 expected-stdout:
-	@(#)MIRBSD KSH R55 2017/07/26
+	@(#)MIRBSD KSH R56 2017/08/07
 description:
 	Check base version of full shell
 stdin:
@@ -39,7 +39,7 @@ name: KSH_VERSION
 category: !shell:legacy-yes
 ---
 expected-stdout:
-	@(#)LEGACY KSH R55 2017/07/26
+	@(#)LEGACY KSH R56 2017/08/07
 description:
 	Check base version of legacy shell
 stdin:
@@ -7046,6 +7046,48 @@ expected-stdout:
 	y1-
 	x2-3- z1-
 ---
+name: exec-modern-korn-shell
+description:
+	Check that exec can execute any command that makes it
+	through syntax and parser
+stdin:
+	print '#!'"$__progname"'\necho tf' >lq
+	chmod +x lq
+	PATH=$PWD
+	exec 2>&1
+	foo() { print two; }
+	print =1
+	(exec print one)
+	print =2
+	(exec foo)
+	print =3
+	(exec ls)
+	print =4
+	(exec lq)
+expected-stdout-pattern:
+	/=1\none\n=2\ntwo\n=3\n.*: ls: not found\n=4\ntf\n/
+---
+name: exec-ksh88
+description:
+	Check that exec only executes after a PATH search
+arguments: !-o!posix!
+stdin:
+	print '#!'"$__progname"'\necho tf' >lq
+	chmod +x lq
+	PATH=$PWD
+	exec 2>&1
+	foo() { print two; }
+	print =1
+	(exec print one)
+	print =2
+	(exec foo)
+	print =3
+	(exec ls)
+	print =4
+	(exec lq)
+expected-stdout-pattern:
+	/=1\n.*: print: not found\n=2\n.*: foo: not found\n=3\n.*: ls: not found\n=4\ntf\n/
+---
 name: xxx-what-do-you-call-this-1
 stdin:
 	echo "${foo:-"a"}*"

exec.c

@@ -23,7 +23,7 @@
 
 #include "sh.h"
 
-__RCSID("$MirOS: src/bin/mksh/exec.c,v 1.198 2017/04/29 22:04:28 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/exec.c,v 1.199 2017/08/07 21:16:31 tg Exp $");
 
 #ifndef MKSH_DEFAULT_EXECSHELL
 #define MKSH_DEFAULT_EXECSHELL	MKSH_UNIXROOT "/bin/sh"
@@ -554,6 +554,9 @@ comexec(struct op *t, struct tbl * volatile tp, const char **ap,
 				}
 			ap += builtin_opt.optind;
 			flags |= XEXEC;
+			/* POSuX demands ksh88-like behaviour here */
+			if (Flag(FPOSIX))
+				fcflags = FC_PATH;
 		} else if (tp->val.f == c_command) {
 			bool saw_p = false;
 

mksh.1

@@ -1,4 +1,4 @@
-.\" $MirOS: src/bin/mksh/mksh.1,v 1.448 2017/08/07 20:49:42 tg Exp $
+.\" $MirOS: src/bin/mksh/mksh.1,v 1.449 2017/08/07 21:16:32 tg Exp $
 .\" $OpenBSD: ksh.1,v 1.160 2015/07/04 13:27:04 feinerer Exp $
 .\"-
 .\" Copyright © 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
@@ -5387,6 +5387,11 @@ only lists signal names, all in one line.
 .Ic getopts
 does not accept options with a leading
 .Ql + .
+.It
+.Ic exec
+skips builtins, functions and other commands and uses a
+.Ev PATH
+search to determine the utility to execute.
 .El
 .Ss SH mode
 Compatibility mode; intended for use with legacy scripts that
@@ -6691,7 +6696,7 @@ for the in-memory portion of the history is slow, should use
 .Xr memmove 3 .
 .Pp
 This document attempts to describe
-.Nm mksh\ R55
+.Nm mksh\ R56
 and up,
 .\" with vendor patches from insert-your-name-here,
 compiled without any options impacting functionality, such as