Move mksh to external/mksh

Change-Id: I836b8764320bd498c335d97267d8b47acb97514d

1 files changed, 0 insertions, 1479 deletions

diff --git a/mksh/src/main.c b/mksh/src/main.c
deleted file mode 100644
index f962dd4..0000000
--- a/mksh/src/main.c
+++ /dev/null
@@ -1,1479 +0,0 @@
-/*	$OpenBSD: main.c,v 1.46 2010/05/19 17:36:08 jasper Exp $	*/
-/*	$OpenBSD: tty.c,v 1.9 2006/03/14 22:08:01 deraadt Exp $	*/
-/*	$OpenBSD: io.c,v 1.22 2006/03/17 16:30:13 millert Exp $	*/
-/*	$OpenBSD: table.c,v 1.13 2009/01/17 22:06:44 millert Exp $	*/
-
-/*-
- * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
- *	Thorsten Glaser <tg@mirbsd.org>
- *
- * Provided that these terms and disclaimer and all copyright notices
- * are retained or reproduced in an accompanying document, permission
- * is granted to deal in this work without restriction, including un-
- * limited rights to use, publicly perform, distribute, sell, modify,
- * merge, give away, or sublicence.
- *
- * This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
- * the utmost extent permitted by applicable law, neither express nor
- * implied; without malicious intent or gross negligence. In no event
- * may a licensor, author or contributor be held liable for indirect,
- * direct, other damage, loss, or other issues arising in any way out
- * of dealing in the work, even if advised of the possibility of such
- * damage or existence of a defect, except proven that it results out
- * of said person's immediate fault when using the work as intended.
- */
-
-#define	EXTERN
-#include "sh.h"
-
-#if HAVE_LANGINFO_CODESET
-#include <langinfo.h>
-#endif
-#if HAVE_SETLOCALE_CTYPE
-#include <locale.h>
-#endif
-
-__RCSID("$MirOS: src/bin/mksh/main.c,v 1.167 2010/07/04 17:45:15 tg Exp $");
-
-extern char **environ;
-
-#if !HAVE_SETRESUGID
-extern uid_t kshuid;
-extern gid_t kshgid, kshegid;
-#endif
-
-#ifndef MKSHRC_PATH
-#define MKSHRC_PATH	"~/.mkshrc"
-#endif
-
-#ifndef MKSH_DEFAULT_TMPDIR
-#define MKSH_DEFAULT_TMPDIR	"/tmp"
-#endif
-
-static void reclaim(void);
-static void remove_temps(struct temp *);
-void chvt_reinit(void);
-Source *mksh_init(int, const char *[]);
-#ifdef SIGWINCH
-static void x_sigwinch(int);
-#endif
-
-static const char initifs[] = "IFS= \t\n";
-
-static const char initsubs[] =
-    "${PS2=> } ${PS3=#? } ${PS4=+ } ${SECONDS=0} ${TMOUT=0}";
-
-static const char *initcoms[] = {
-	T_typeset, "-r", initvsn, NULL,
-	T_typeset, "-x", "HOME", "PATH", "RANDOM", "SHELL", NULL,
-	T_typeset, "-i10", "COLUMNS", "LINES", "OPTIND", "PGRP", "PPID",
-	    "RANDOM", "SECONDS", "TMOUT", "USER_ID", NULL,
-	"alias",
-	"integer=typeset -i",
-	T_local_typeset,
-	"hash=alias -t",	/* not "alias -t --": hash -r needs to work */
-	"type=whence -v",
-#ifndef MKSH_UNEMPLOYED
-	"suspend=kill -STOP $$",
-#endif
-	"autoload=typeset -fu",
-	"functions=typeset -f",
-	"history=fc -l",
-	"nameref=typeset -n",
-	"nohup=nohup ",
-	r_fc_e_,
-	"source=PATH=$PATH:. command .",
-	"login=exec login",
-	NULL,
-	 /* this is what AT&T ksh seems to track, with the addition of emacs */
-	"alias", "-tU",
-	"cat", "cc", "chmod", "cp", "date", "ed", "emacs", "grep", "ls",
-	"make", "mv", "pr", "rm", "sed", "sh", "vi", "who", NULL,
-	NULL
-};
-
-static int initio_done;
-
-struct env *e = &kshstate_v.env_;
-
-void
-chvt_reinit(void)
-{
-	kshpid = procpid = getpid();
-	ksheuid = geteuid();
-	kshpgrp = getpgrp();
-	kshppid = getppid();
-}
-
-Source *
-mksh_init(int argc, const char *argv[])
-{
-	int argi, i;
-	Source *s;
-	struct block *l;
-	unsigned char restricted, errexit, utf_flag;
-	const char **wp;
-	struct tbl *vp;
-	struct stat s_stdin;
-#if !defined(_PATH_DEFPATH) && defined(_CS_PATH)
-	size_t k;
-	char *cp;
-#endif
-
-	/* do things like getpgrp() et al. */
-	chvt_reinit();
-
-	/* make sure argv[] is sane */
-	if (!*argv) {
-		static const char *empty_argv[] = {
-			"mksh", NULL
-		};
-
-		argv = empty_argv;
-		argc = 1;
-	}
-	kshname = *argv;
-
-	ainit(&aperm);		/* initialise permanent Area */
-
-	/* set up base environment */
-	kshstate_v.env_.type = E_NONE;
-	ainit(&kshstate_v.env_.area);
-	newblock();		/* set up global l->vars and l->funs */
-
-	/* Do this first so output routines (eg, errorf, shellf) can work */
-	initio();
-
-	argi = parse_args(argv, OF_FIRSTTIME, NULL);
-	if (argi < 0)
-		return (NULL);
-
-	initvar();
-
-	initctypes();
-
-	inittraps();
-
-	coproc_init();
-
-	/* set up variable and command dictionaries */
-	ktinit(&taliases, APERM, 0);
-	ktinit(&aliases, APERM, 0);
-#ifndef MKSH_NOPWNAM
-	ktinit(&homedirs, APERM, 0);
-#endif
-
-	/* define shell keywords */
-	initkeywords();
-
-	/* define built-in commands */
-	ktinit(&builtins, APERM,
-	    /* must be 80% of 2^n (currently 44 builtins) */ 64);
-	for (i = 0; mkshbuiltins[i].name != NULL; i++)
-		builtin(mkshbuiltins[i].name, mkshbuiltins[i].func);
-
-	init_histvec();
-
-#ifdef _PATH_DEFPATH
-	def_path = _PATH_DEFPATH;
-#else
-#ifdef _CS_PATH
-	if ((k = confstr(_CS_PATH, NULL, 0)) != (size_t)-1 && k > 0 &&
-	    confstr(_CS_PATH, cp = alloc(k + 1, APERM), k + 1) == k + 1)
-		def_path = cp;
-	else
-#endif
-		/*
-		 * this is uniform across all OSes unless it
-		 * breaks somewhere; don't try to optimise,
-		 * e.g. add stuff for Interix or remove /usr
-		 * for HURD, because e.g. Debian GNU/HURD is
-		 * "keeping a regular /usr"; this is supposed
-		 * to be a sane 'basic' default PATH
-		 */
-		def_path = "/bin:/usr/bin:/sbin:/usr/sbin";
-#endif
-
-	/* Set PATH to def_path (will set the path global variable).
-	 * (import of environment below will probably change this setting).
-	 */
-	vp = global("PATH");
-	/* setstr can't fail here */
-	setstr(vp, def_path, KSH_RETURN_ERROR);
-
-	/* Turn on nohup by default for now - will change to off
-	 * by default once people are aware of its existence
-	 * (AT&T ksh does not have a nohup option - it always sends
-	 * the hup).
-	 */
-	Flag(FNOHUP) = 1;
-
-	/* Turn on brace expansion by default. AT&T kshs that have
-	 * alternation always have it on.
-	 */
-	Flag(FBRACEEXPAND) = 1;
-
-	/* Set edit mode to emacs by default, may be overridden
-	 * by the environment or the user. Also, we want tab completion
-	 * on in vi by default. */
-	change_flag(FEMACS, OF_SPECIAL, 1);
-#if !MKSH_S_NOVI
-	Flag(FVITABCOMPLETE) = 1;
-#endif
-
-#ifdef MKSH_BINSHREDUCED
-	/* set FSH if we're called as -sh or /bin/sh or so */
-	{
-		const char *cc;
-
-		cc = kshname;
-		i = 0; argi = 0;
-		while (cc[i] != '\0')
-			/* the following line matches '-' and '/' ;-) */
-			if ((cc[i++] | 2) == '/')
-				argi = i;
-		if (((cc[argi] | 0x20) == 's') && ((cc[argi + 1] | 0x20) == 'h'))
-			change_flag(FSH, OF_FIRSTTIME, 1);
-	}
-#endif
-
-	/* import environment */
-	if (environ != NULL)
-		for (wp = (const char **)environ; *wp != NULL; wp++)
-			typeset(*wp, IMPORT | EXPORT, 0, 0, 0);
-
-	typeset(initifs, 0, 0, 0, 0);	/* for security */
-
-	/* assign default shell variable values */
-	substitute(initsubs, 0);
-
-	/* Figure out the current working directory and set $PWD */
-	{
-		struct stat s_pwd, s_dot;
-		struct tbl *pwd_v = global("PWD");
-		char *pwd = str_val(pwd_v);
-		char *pwdx = pwd;
-
-		/* Try to use existing $PWD if it is valid */
-		if (pwd[0] != '/' ||
-		    stat(pwd, &s_pwd) < 0 || stat(".", &s_dot) < 0 ||
-		    s_pwd.st_dev != s_dot.st_dev ||
-		    s_pwd.st_ino != s_dot.st_ino)
-			pwdx = NULL;
-		set_current_wd(pwdx);
-		if (current_wd[0])
-			simplify_path(current_wd);
-		/* Only set pwd if we know where we are or if it had a
-		 * bogus value
-		 */
-		if (current_wd[0] || pwd != null)
-			/* setstr can't fail here */
-			setstr(pwd_v, current_wd, KSH_RETURN_ERROR);
-	}
-
-	for (wp = initcoms; *wp != NULL; wp++) {
-		shcomexec(wp);
-		while (*wp != NULL)
-			wp++;
-	}
-	setint(global("COLUMNS"), 0);
-	setint(global("LINES"), 0);
-	setint(global("OPTIND"), 1);
-
-	safe_prompt = ksheuid ? "$ " : "# ";
-	vp = global("PS1");
-	/* Set PS1 if unset or we are root and prompt doesn't contain a # */
-	if (!(vp->flag & ISSET) ||
-	    (!ksheuid && !strchr(str_val(vp), '#')))
-		/* setstr can't fail here */
-		setstr(vp, safe_prompt, KSH_RETURN_ERROR);
-	setint((vp = global("PGRP")), (mksh_uari_t)kshpgrp);
-	vp->flag |= INT_U;
-	setint((vp = global("PPID")), (mksh_uari_t)kshppid);
-	vp->flag |= INT_U;
-	setint((vp = global("RANDOM")), (mksh_uari_t)evilhash(kshname));
-	vp->flag |= INT_U;
-	setint((vp = global("USER_ID")), (mksh_uari_t)ksheuid);
-	vp->flag |= INT_U;
-
-	/* Set this before parsing arguments */
-#if HAVE_SETRESUGID
-	Flag(FPRIVILEGED) = getuid() != ksheuid || getgid() != getegid();
-#else
-	Flag(FPRIVILEGED) = (kshuid = getuid()) != ksheuid ||
-	    (kshgid = getgid()) != (kshegid = getegid());
-#endif
-
-	/* this to note if monitor is set on command line (see below) */
-#ifndef MKSH_UNEMPLOYED
-	Flag(FMONITOR) = 127;
-#endif
-	/* this to note if utf-8 mode is set on command line (see below) */
-	UTFMODE = 2;
-
-	argi = parse_args(argv, OF_CMDLINE, NULL);
-	if (argi < 0)
-		return (NULL);
-
-	/* process this later only, default to off (hysterical raisins) */
-	utf_flag = UTFMODE;
-	UTFMODE = 0;
-
-	if (Flag(FCOMMAND)) {
-		s = pushs(SSTRING, ATEMP);
-		if (!(s->start = s->str = argv[argi++]))
-			errorf("-c requires an argument");
-#ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT
-		/* compatibility to MidnightBSD 0.1 /bin/sh (kludge) */
-		if (Flag(FSH) && argv[argi] && !strcmp(argv[argi], "--"))
-			++argi;
-#endif
-		if (argv[argi])
-			kshname = argv[argi++];
-	} else if (argi < argc && !Flag(FSTDIN)) {
-		s = pushs(SFILE, ATEMP);
-		s->file = argv[argi++];
-		s->u.shf = shf_open(s->file, O_RDONLY, 0,
-		    SHF_MAPHI | SHF_CLEXEC);
-		if (s->u.shf == NULL) {
-			shl_stdout_ok = 0;
-			warningf(true, "%s: %s", s->file, strerror(errno));
-			/* mandated by SUSv4 */
-			exstat = 127;
-			unwind(LERROR);
-		}
-		kshname = s->file;
-	} else {
-		Flag(FSTDIN) = 1;
-		s = pushs(SSTDIN, ATEMP);
-		s->file = "<stdin>";
-		s->u.shf = shf_fdopen(0, SHF_RD | can_seek(0),
-		    NULL);
-		if (isatty(0) && isatty(2)) {
-			Flag(FTALKING) = Flag(FTALKING_I) = 1;
-			/* The following only if isatty(0) */
-			s->flags |= SF_TTY;
-			s->u.shf->flags |= SHF_INTERRUPT;
-			s->file = NULL;
-		}
-	}
-
-	/* this bizarreness is mandated by POSIX */
-	if (fstat(0, &s_stdin) >= 0 && S_ISCHR(s_stdin.st_mode) &&
-	    Flag(FTALKING))
-		reset_nonblock(0);
-
-	/* initialise job control */
-	j_init();
-	/* set: 0/1; unset: 2->0 */
-	UTFMODE = utf_flag & 1;
-	/* Do this after j_init(), as tty_fd is not initialised until then */
-	if (Flag(FTALKING)) {
-		if (utf_flag == 2) {
-#ifndef MKSH_ASSUME_UTF8
-#define isuc(x)	(((x) != NULL) && \
-		    (stristr((x), "UTF-8") || stristr((x), "utf8")))
-		/* Check if we're in a UTF-8 locale */
-			const char *ccp;
-
-#if HAVE_SETLOCALE_CTYPE
-			ccp = setlocale(LC_CTYPE, "");
-#if HAVE_LANGINFO_CODESET
-			if (!isuc(ccp))
-				ccp = nl_langinfo(CODESET);
-#endif
-#else
-			/* these were imported from environ earlier */
-			ccp = str_val(global("LC_ALL"));
-			if (ccp == null)
-				ccp = str_val(global("LC_CTYPE"));
-			if (ccp == null)
-				ccp = str_val(global("LANG"));
-#endif
-			UTFMODE = isuc(ccp);
-#undef isuc
-#elif MKSH_ASSUME_UTF8
-			UTFMODE = 1;
-#else
-			UTFMODE = 0;
-#endif
-		}
-		x_init();
-	}
-
-#ifdef SIGWINCH
-	sigtraps[SIGWINCH].flags |= TF_SHELL_USES;
-	setsig(&sigtraps[SIGWINCH], x_sigwinch,
-	    SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP);
-#endif
-
-	l = e->loc;
-	l->argv = &argv[argi - 1];
-	l->argc = argc - argi;
-	l->argv[0] = kshname;
-	getopts_reset(1);
-
-	/* Disable during .profile/ENV reading */
-	restricted = Flag(FRESTRICTED);
-	Flag(FRESTRICTED) = 0;
-	errexit = Flag(FERREXIT);
-	Flag(FERREXIT) = 0;
-
-	/* Do this before profile/$ENV so that if it causes problems in them,
-	 * user will know why things broke.
-	 */
-	if (!current_wd[0] && Flag(FTALKING))
-		warningf(false, "Cannot determine current working directory");
-
-	if (Flag(FLOGIN)) {
-		include(KSH_SYSTEM_PROFILE, 0, NULL, 1);
-		if (!Flag(FPRIVILEGED))
-			include(substitute("$HOME/.profile", 0), 0,
-			    NULL, 1);
-	}
-	if (Flag(FPRIVILEGED))
-		include("/etc/suid_profile", 0, NULL, 1);
-	else if (Flag(FTALKING)) {
-		char *env_file;
-
-		/* include $ENV */
-		env_file = substitute(substitute("${ENV:-" MKSHRC_PATH "}", 0),
-		    DOTILDE);
-		if (*env_file != '\0')
-			include(env_file, 0, NULL, 1);
-	}
-
-	if (restricted) {
-		static const char *restr_com[] = {
-			T_typeset, "-r", "PATH",
-			"ENV", "SHELL",
-			NULL
-		};
-		shcomexec(restr_com);
-		/* After typeset command... */
-		Flag(FRESTRICTED) = 1;
-	}
-	Flag(FERREXIT) = errexit;
-
-	if (Flag(FTALKING)) {
-		hist_init(s);
-		alarm_init();
-	} else
-		Flag(FTRACKALL) = 1;	/* set after ENV */
-
-	return (s);
-}
-
-int
-main(int argc, const char *argv[])
-{
-	Source *s;
-
-	kshstate_v.lcg_state_ = 5381;
-
-	if ((s = mksh_init(argc, argv))) {
-		/* put more entropy into the LCG */
-		change_random(s, sizeof(*s));
-		/* doesn’t return */
-		shell(s, true);
-	}
-	return (1);
-}
-
-int
-include(const char *name, int argc, const char **argv, int intr_ok)
-{
-	Source *volatile s = NULL;
-	struct shf *shf;
-	const char **volatile old_argv;
-	volatile int old_argc;
-	int i;
-
-	shf = shf_open(name, O_RDONLY, 0, SHF_MAPHI | SHF_CLEXEC);
-	if (shf == NULL)
-		return (-1);
-
-	if (argv) {
-		old_argv = e->loc->argv;
-		old_argc = e->loc->argc;
-	} else {
-		old_argv = NULL;
-		old_argc = 0;
-	}
-	newenv(E_INCL);
-	i = sigsetjmp(e->jbuf, 0);
-	if (i) {
-		quitenv(s ? s->u.shf : NULL);
-		if (old_argv) {
-			e->loc->argv = old_argv;
-			e->loc->argc = old_argc;
-		}
-		switch (i) {
-		case LRETURN:
-		case LERROR:
-			return (exstat & 0xff); /* see below */
-		case LINTR:
-			/* intr_ok is set if we are including .profile or $ENV.
-			 * If user ^Cs out, we don't want to kill the shell...
-			 */
-			if (intr_ok && (exstat - 128) != SIGTERM)
-				return (1);
-			/* FALLTHROUGH */
-		case LEXIT:
-		case LLEAVE:
-		case LSHELL:
-			unwind(i);
-			/* NOTREACHED */
-		default:
-			internal_errorf("include: %d", i);
-			/* NOTREACHED */
-		}
-	}
-	if (argv) {
-		e->loc->argv = argv;
-		e->loc->argc = argc;
-	}
-	s = pushs(SFILE, ATEMP);
-	s->u.shf = shf;
-	strdupx(s->file, name, ATEMP);
-	i = shell(s, false);
-	quitenv(s->u.shf);
-	if (old_argv) {
-		e->loc->argv = old_argv;
-		e->loc->argc = old_argc;
-	}
-	return (i & 0xff);	/* & 0xff to ensure value not -1 */
-}
-
-/* spawn a command into a shell optionally keeping track of the line number */
-int
-command(const char *comm, int line)
-{
-	Source *s;
-
-	s = pushs(SSTRING, ATEMP);
-	s->start = s->str = comm;
-	s->line = line;
-	return (shell(s, false));
-}
-
-/*
- * run the commands from the input source, returning status.
- */
-int
-shell(Source * volatile s, volatile int toplevel)
-{
-	struct op *t;
-	volatile int wastty = s->flags & SF_TTY;
-	volatile int attempts = 13;
-	volatile int interactive = Flag(FTALKING) && toplevel;
-	Source *volatile old_source = source;
-	int i;
-
-	s->flags |= SF_FIRST;	/* enable UTF-8 BOM check */
-
-	newenv(E_PARSE);
-	if (interactive)
-		really_exit = 0;
-	i = sigsetjmp(e->jbuf, 0);
-	if (i) {
-		switch (i) {
-		case LINTR: /* we get here if SIGINT not caught or ignored */
-		case LERROR:
-		case LSHELL:
-			if (interactive) {
-				if (i == LINTR)
-					shellf("\n");
-				/* Reset any eof that was read as part of a
-				 * multiline command.
-				 */
-				if (Flag(FIGNOREEOF) && s->type == SEOF &&
-				    wastty)
-					s->type = SSTDIN;
-				/* Used by exit command to get back to
-				 * top level shell. Kind of strange since
-				 * interactive is set if we are reading from
-				 * a tty, but to have stopped jobs, one only
-				 * needs FMONITOR set (not FTALKING/SF_TTY)...
-				 */
-				/* toss any input we have so far */
-				s->start = s->str = null;
-				break;
-			}
-			/* FALLTHROUGH */
-		case LEXIT:
-		case LLEAVE:
-		case LRETURN:
-			source = old_source;
-			quitenv(NULL);
-			unwind(i);	/* keep on going */
-			/* NOTREACHED */
-		default:
-			source = old_source;
-			quitenv(NULL);
-			internal_errorf("shell: %d", i);
-			/* NOTREACHED */
-		}
-	}
-	while (1) {
-		if (trap)
-			runtraps(0);
-
-		if (s->next == NULL) {
-			if (Flag(FVERBOSE))
-				s->flags |= SF_ECHO;
-			else
-				s->flags &= ~SF_ECHO;
-		}
-		if (interactive) {
-			j_notify();
-			set_prompt(PS1, s);
-		}
-		t = compile(s);
-		if (t != NULL && t->type == TEOF) {
-			if (wastty && Flag(FIGNOREEOF) && --attempts > 0) {
-				shellf("Use 'exit' to leave ksh\n");
-				s->type = SSTDIN;
-			} else if (wastty && !really_exit &&
-			    j_stopped_running()) {
-				really_exit = 1;
-				s->type = SSTDIN;
-			} else {
-				/* this for POSIX which says EXIT traps
-				 * shall be taken in the environment
-				 * immediately after the last command
-				 * executed.
-				 */
-				if (toplevel)
-					unwind(LEXIT);
-				break;
-			}
-		}
-		if (t && (!Flag(FNOEXEC) || (s->flags & SF_TTY)))
-			exstat = execute(t, 0, NULL);
-
-		if (t != NULL && t->type != TEOF && interactive && really_exit)
-			really_exit = 0;
-
-		reclaim();
-	}
-	quitenv(NULL);
-	source = old_source;
-	return (exstat);
-}
-
-/* return to closest error handler or shell(), exit if none found */
-void
-unwind(int i)
-{
-	/* ordering for EXIT vs ERR is a bit odd (this is what AT&T ksh does) */
-	if (i == LEXIT || (Flag(FERREXIT) && (i == LERROR || i == LINTR) &&
-	    sigtraps[SIGEXIT_].trap)) {
-		runtrap(&sigtraps[SIGEXIT_]);
-		i = LLEAVE;
-	} else if (Flag(FERREXIT) && (i == LERROR || i == LINTR)) {
-		runtrap(&sigtraps[SIGERR_]);
-		i = LLEAVE;
-	}
-	while (1) {
-		switch (e->type) {
-		case E_PARSE:
-		case E_FUNC:
-		case E_INCL:
-		case E_LOOP:
-		case E_ERRH:
-			siglongjmp(e->jbuf, i);
-			/* NOTREACHED */
-		case E_NONE:
-			if (i == LINTR)
-				e->flags |= EF_FAKE_SIGDIE;
-			/* FALLTHROUGH */
-		default:
-			quitenv(NULL);
-		}
-	}
-}
-
-void
-newenv(int type)
-{
-	struct env *ep;
-	char *cp;
-
-	/*
-	 * struct env includes ALLOC_ITEM for alignment constraints
-	 * so first get the actually used memory, then assign it
-	 */
-	cp = alloc(sizeof(struct env) - ALLOC_SIZE, ATEMP);
-	ep = (void *)(cp - ALLOC_SIZE);	/* undo what alloc() did */
-	/* initialise public members of struct env (not the ALLOC_ITEM) */
-	ainit(&ep->area);
-	ep->oenv = e;
-	ep->loc = e->loc;
-	ep->savefd = NULL;
-	ep->temps = NULL;
-	ep->type = type;
-	ep->flags = 0;
-	/* jump buffer is invalid because flags == 0 */
-	e = ep;
-}
-
-void
-quitenv(struct shf *shf)
-{
-	struct env *ep = e;
-	char *cp;
-	int fd;
-
-	if (ep->oenv && ep->oenv->loc != ep->loc)
-		popblock();
-	if (ep->savefd != NULL) {
-		for (fd = 0; fd < NUFILE; fd++)
-			/* if ep->savefd[fd] < 0, means fd was closed */
-			if (ep->savefd[fd])
-				restfd(fd, ep->savefd[fd]);
-		if (ep->savefd[2])	/* Clear any write errors */
-			shf_reopen(2, SHF_WR, shl_out);
-	}
-	/* Bottom of the stack.
-	 * Either main shell is exiting or cleanup_parents_env() was called.
-	 */
-	if (ep->oenv == NULL) {
-		if (ep->type == E_NONE) {	/* Main shell exiting? */
-#if HAVE_PERSISTENT_HISTORY
-			if (Flag(FTALKING))
-				hist_finish();
-#endif
-			j_exit();
-			if (ep->flags & EF_FAKE_SIGDIE) {
-				int sig = exstat - 128;
-
-				/* ham up our death a bit (AT&T ksh
-				 * only seems to do this for SIGTERM)
-				 * Don't do it for SIGQUIT, since we'd
-				 * dump a core..
-				 */
-				if ((sig == SIGINT || sig == SIGTERM) &&
-				    (kshpgrp == kshpid)) {
-					setsig(&sigtraps[sig], SIG_DFL,
-					    SS_RESTORE_CURR | SS_FORCE);
-					kill(0, sig);
-				}
-			}
-		}
-		if (shf)
-			shf_close(shf);
-		reclaim();
-		exit(exstat);
-	}
-	if (shf)
-		shf_close(shf);
-	reclaim();
-
-	e = e->oenv;
-
-	/* free the struct env - tricky due to the ALLOC_ITEM inside */
-	cp = (void *)ep;
-	afree(cp + ALLOC_SIZE, ATEMP);
-}
-
-/* Called after a fork to cleanup stuff left over from parents environment */
-void
-cleanup_parents_env(void)
-{
-	struct env *ep;
-	int fd;
-
-	mkssert(e != NULL);
-
-	/*
-	 * Don't clean up temporary files - parent will probably need them.
-	 * Also, can't easily reclaim memory since variables, etc. could be
-	 * anywhere.
-	 */
-
-	/* close all file descriptors hiding in savefd */
-	for (ep = e; ep; ep = ep->oenv) {
-		if (ep->savefd) {
-			for (fd = 0; fd < NUFILE; fd++)
-				if (ep->savefd[fd] > 0)
-					close(ep->savefd[fd]);
-			afree(ep->savefd, &ep->area);
-			ep->savefd = NULL;
-		}
-	}
-	e->oenv = NULL;
-}
-
-/* Called just before an execve cleanup stuff temporary files */
-void
-cleanup_proc_env(void)
-{
-	struct env *ep;
-
-	for (ep = e; ep; ep = ep->oenv)
-		remove_temps(ep->temps);
-}
-
-/* remove temp files and free ATEMP Area */
-static void
-reclaim(void)
-{
-	remove_temps(e->temps);
-	e->temps = NULL;
-	afreeall(&e->area);
-}
-
-static void
-remove_temps(struct temp *tp)
-{
-	for (; tp != NULL; tp = tp->next)
-		if (tp->pid == procpid)
-			unlink(tp->name);
-}
-
-/* Initialise tty_fd. Used for saving/reseting tty modes upon
- * foreground job completion and for setting up tty process group.
- */
-void
-tty_init(bool init_ttystate, bool need_tty)
-{
-	bool do_close = true;
-	int tfd;
-
-	if (tty_fd >= 0) {
-		close(tty_fd);
-		tty_fd = -1;
-	}
-	tty_devtty = 1;
-
-#ifdef _UWIN
-	/* XXX imake style */
-	if (isatty(3))
-		tfd = 3;
-	else
-#endif
-	if ((tfd = open("/dev/tty", O_RDWR, 0)) < 0) {
-		tty_devtty = 0;
-		if (need_tty)
-			warningf(false,
-			    "No controlling tty (open /dev/tty: %s)",
-			    strerror(errno));
-	}
-	if (tfd < 0) {
-		do_close = false;
-		if (isatty(0))
-			tfd = 0;
-		else if (isatty(2))
-			tfd = 2;
-		else {
-			if (need_tty)
-				warningf(false,
-				    "Can't find tty file descriptor");
-			return;
-		}
-	}
-	if ((tty_fd = fcntl(tfd, F_DUPFD, FDBASE)) < 0) {
-		if (need_tty)
-			warningf(false, "j_ttyinit: dup of tty fd failed: %s",
-			    strerror(errno));
-	} else if (fcntl(tty_fd, F_SETFD, FD_CLOEXEC) < 0) {
-		if (need_tty)
-			warningf(false,
-			    "j_ttyinit: can't set close-on-exec flag: %s",
-			    strerror(errno));
-		close(tty_fd);
-		tty_fd = -1;
-	} else if (init_ttystate)
-		tcgetattr(tty_fd, &tty_state);
-	if (do_close)
-		close(tfd);
-}
-
-void
-tty_close(void)
-{
-	if (tty_fd >= 0) {
-		close(tty_fd);
-		tty_fd = -1;
-	}
-}
-
-/* A shell error occurred (eg, syntax error, etc.) */
-void
-errorf(const char *fmt, ...)
-{
-	va_list va;
-
-	shl_stdout_ok = 0;	/* debugging: note that stdout not valid */
-	exstat = 1;
-	if (*fmt != 1) {
-		error_prefix(true);
-		va_start(va, fmt);
-		shf_vfprintf(shl_out, fmt, va);
-		va_end(va);
-		shf_putchar('\n', shl_out);
-	}
-	shf_flush(shl_out);
-	unwind(LERROR);
-}
-
-/* like errorf(), but no unwind is done */
-void
-warningf(bool fileline, const char *fmt, ...)
-{
-	va_list va;
-
-	error_prefix(fileline);
-	va_start(va, fmt);
-	shf_vfprintf(shl_out, fmt, va);
-	va_end(va);
-	shf_putchar('\n', shl_out);
-	shf_flush(shl_out);
-}
-
-/* Used by built-in utilities to prefix shell and utility name to message
- * (also unwinds environments for special builtins).
- */
-void
-bi_errorf(const char *fmt, ...)
-{
-	va_list va;
-
-	shl_stdout_ok = 0;	/* debugging: note that stdout not valid */
-	exstat = 1;
-	if (*fmt != 1) {
-		error_prefix(true);
-		/* not set when main() calls parse_args() */
-		if (builtin_argv0)
-			shf_fprintf(shl_out, "%s: ", builtin_argv0);
-		va_start(va, fmt);
-		shf_vfprintf(shl_out, fmt, va);
-		va_end(va);
-		shf_putchar('\n', shl_out);
-	}
-	shf_flush(shl_out);
-	/* POSIX special builtins and ksh special builtins cause
-	 * non-interactive shells to exit.
-	 * XXX odd use of KEEPASN; also may not want LERROR here
-	 */
-	if (builtin_flag & SPEC_BI) {
-		builtin_argv0 = NULL;
-		unwind(LERROR);
-	}
-}
-
-/* Called when something that shouldn't happen does */
-void
-internal_verrorf(const char *fmt, va_list ap)
-{
-	shf_fprintf(shl_out, "internal error: ");
-	shf_vfprintf(shl_out, fmt, ap);
-	shf_putchar('\n', shl_out);
-	shf_flush(shl_out);
-}
-
-void
-internal_errorf(const char *fmt, ...)
-{
-	va_list va;
-
-	va_start(va, fmt);
-	internal_verrorf(fmt, va);
-	va_end(va);
-	unwind(LERROR);
-}
-
-void
-internal_warningf(const char *fmt, ...)
-{
-	va_list va;
-
-	va_start(va, fmt);
-	internal_verrorf(fmt, va);
-	va_end(va);
-}
-
-/* used by error reporting functions to print "ksh: .kshrc[25]: " */
-void
-error_prefix(bool fileline)
-{
-	/* Avoid foo: foo[2]: ... */
-	if (!fileline || !source || !source->file ||
-	    strcmp(source->file, kshname) != 0)
-		shf_fprintf(shl_out, "%s: ", kshname + (*kshname == '-'));
-	if (fileline && source && source->file != NULL) {
-		shf_fprintf(shl_out, "%s[%d]: ", source->file,
-		    source->errline > 0 ? source->errline : source->line);
-		source->errline = 0;
-	}
-}
-
-/* printf to shl_out (stderr) with flush */
-void
-shellf(const char *fmt, ...)
-{
-	va_list va;
-
-	if (!initio_done) /* shl_out may not be set up yet... */
-		return;
-	va_start(va, fmt);
-	shf_vfprintf(shl_out, fmt, va);
-	va_end(va);
-	shf_flush(shl_out);
-}
-
-/* printf to shl_stdout (stdout) */
-void
-shprintf(const char *fmt, ...)
-{
-	va_list va;
-
-	if (!shl_stdout_ok)
-		internal_errorf("shl_stdout not valid");
-	va_start(va, fmt);
-	shf_vfprintf(shl_stdout, fmt, va);
-	va_end(va);
-}
-
-/* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */
-int
-can_seek(int fd)
-{
-	struct stat statb;
-
-	return (fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ?
-	    SHF_UNBUF : 0);
-}
-
-struct shf shf_iob[3];
-
-void
-initio(void)
-{
-	shf_fdopen(1, SHF_WR, shl_stdout);	/* force buffer allocation */
-	shf_fdopen(2, SHF_WR, shl_out);
-	shf_fdopen(2, SHF_WR, shl_spare);	/* force buffer allocation */
-	initio_done = 1;
-}
-
-/* A dup2() with error checking */
-int
-ksh_dup2(int ofd, int nfd, bool errok)
-{
-	int rv;
-
-	if (((rv = dup2(ofd, nfd)) < 0) && !errok && (errno != EBADF))
-		errorf("too many files open in shell");
-
-#ifdef __ultrix
-	/* XXX imake style */
-	if (rv >= 0)
-		fcntl(nfd, F_SETFD, 0);
-#endif
-
-	return (rv);
-}
-
-/*
- * move fd from user space (0<=fd<10) to shell space (fd>=10),
- * set close-on-exec flag.
- */
-short
-savefd(int fd)
-{
-	int nfd = fd;
-
-	if (fd < FDBASE && (nfd = fcntl(fd, F_DUPFD, FDBASE)) < 0 &&
-	    errno == EBADF)
-		return (-1);
-	if (nfd < 0 || nfd > SHRT_MAX)
-		errorf("too many files open in shell");
-	fcntl(nfd, F_SETFD, FD_CLOEXEC);
-	return ((short)nfd);
-}
-
-void
-restfd(int fd, int ofd)
-{
-	if (fd == 2)
-		shf_flush(&shf_iob[fd]);
-	if (ofd < 0)		/* original fd closed */
-		close(fd);
-	else if (fd != ofd) {
-		ksh_dup2(ofd, fd, true); /* XXX: what to do if this fails? */
-		close(ofd);
-	}
-}
-
-void
-openpipe(int *pv)
-{
-	int lpv[2];
-
-	if (pipe(lpv) < 0)
-		errorf("can't create pipe - try again");
-	pv[0] = savefd(lpv[0]);
-	if (pv[0] != lpv[0])
-		close(lpv[0]);
-	pv[1] = savefd(lpv[1]);
-	if (pv[1] != lpv[1])
-		close(lpv[1]);
-}
-
-void
-closepipe(int *pv)
-{
-	close(pv[0]);
-	close(pv[1]);
-}
-
-/* Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn
- * a string (the X in 2>&X, read -uX, print -uX) into a file descriptor.
- */
-int
-check_fd(const char *name, int mode, const char **emsgp)
-{
-	int fd, fl;
-
-	if (name[0] == 'p' && !name[1])
-		return (coproc_getfd(mode, emsgp));
-	for (fd = 0; ksh_isdigit(*name); ++name)
-		fd = (fd * 10) + *name - '0';
-	if (*name || fd >= FDBASE) {
-		if (emsgp)
-			*emsgp = "illegal file descriptor name";
-		return (-1);
-	}
-	if ((fl = fcntl(fd, F_GETFL, 0)) < 0) {
-		if (emsgp)
-			*emsgp = "bad file descriptor";
-		return (-1);
-	}
-	fl &= O_ACCMODE;
-	/* X_OK is a kludge to disable this check for dups (x<&1):
-	 * historical shells never did this check (XXX don't know what
-	 * POSIX has to say).
-	 */
-	if (!(mode & X_OK) && fl != O_RDWR && (
-	    ((mode & R_OK) && fl != O_RDONLY) ||
-	    ((mode & W_OK) && fl != O_WRONLY))) {
-		if (emsgp)
-			*emsgp = (fl == O_WRONLY) ?
-			    "fd not open for reading" :
-			    "fd not open for writing";
-		return (-1);
-	}
-	return (fd);
-}
-
-/* Called once from main */
-void
-coproc_init(void)
-{
-	coproc.read = coproc.readw = coproc.write = -1;
-	coproc.njobs = 0;
-	coproc.id = 0;
-}
-
-/* Called by c_read() when eof is read - close fd if it is the co-process fd */
-void
-coproc_read_close(int fd)
-{
-	if (coproc.read >= 0 && fd == coproc.read) {
-		coproc_readw_close(fd);
-		close(coproc.read);
-		coproc.read = -1;
-	}
-}
-
-/* Called by c_read() and by iosetup() to close the other side of the
- * read pipe, so reads will actually terminate.
- */
-void
-coproc_readw_close(int fd)
-{
-	if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) {
-		close(coproc.readw);
-		coproc.readw = -1;
-	}
-}
-
-/* Called by c_print when a write to a fd fails with EPIPE and by iosetup
- * when co-process input is dup'd
- */
-void
-coproc_write_close(int fd)
-{
-	if (coproc.write >= 0 && fd == coproc.write) {
-		close(coproc.write);
-		coproc.write = -1;
-	}
-}
-
-/* Called to check for existence of/value of the co-process file descriptor.
- * (Used by check_fd() and by c_read/c_print to deal with -p option).
- */
-int
-coproc_getfd(int mode, const char **emsgp)
-{
-	int fd = (mode & R_OK) ? coproc.read : coproc.write;
-
-	if (fd >= 0)
-		return (fd);
-	if (emsgp)
-		*emsgp = "no coprocess";
-	return (-1);
-}
-
-/* called to close file descriptors related to the coprocess (if any)
- * Should be called with SIGCHLD blocked.
- */
-void
-coproc_cleanup(int reuse)
-{
-	/* This to allow co-processes to share output pipe */
-	if (!reuse || coproc.readw < 0 || coproc.read < 0) {
-		if (coproc.read >= 0) {
-			close(coproc.read);
-			coproc.read = -1;
-		}
-		if (coproc.readw >= 0) {
-			close(coproc.readw);
-			coproc.readw = -1;
-		}
-	}
-	if (coproc.write >= 0) {
-		close(coproc.write);
-		coproc.write = -1;
-	}
-}
-
-struct temp *
-maketemp(Area *ap, Temp_type type, struct temp **tlist)
-{
-	struct temp *tp;
-	int len;
-	int fd;
-	char *pathname;
-	const char *dir;
-
-	dir = tmpdir ? tmpdir : MKSH_DEFAULT_TMPDIR;
-#if HAVE_MKSTEMP
-	len = strlen(dir) + 6 + 10 + 1;
-#else
-	pathname = tempnam(dir, "mksh.");
-	len = ((pathname == NULL) ? 0 : strlen(pathname)) + 1;
-#endif
-	tp = alloc(sizeof(struct temp) + len, ap);
-	tp->name = (char *)&tp[1];
-#if !HAVE_MKSTEMP
-	if (pathname == NULL)
-		tp->name[0] = '\0';
-	else {
-		memcpy(tp->name, pathname, len);
-		free(pathname);
-	}
-#endif
-	pathname = tp->name;
-	tp->shf = NULL;
-	tp->type = type;
-#if HAVE_MKSTEMP
-	shf_snprintf(pathname, len, "%s/mksh.XXXXXXXXXX", dir);
-	if ((fd = mkstemp(pathname)) >= 0)
-#else
-	if (tp->name[0] && (fd = open(tp->name, O_CREAT | O_RDWR, 0600)) >= 0)
-#endif
-		tp->shf = shf_fdopen(fd, SHF_WR, NULL);
-	tp->pid = procpid;
-
-	tp->next = *tlist;
-	*tlist = tp;
-	return (tp);
-}
-
-/*
- * We use a similar collision resolution algorithm as Python 2.5.4
- * but with a slightly tweaked implementation written from scratch.
- */
-
-#define	INIT_TBLS	8	/* initial table size (power of 2) */
-#define PERTURB_SHIFT	5	/* see Python 2.5.4 Objects/dictobject.c */
-
-static void texpand(struct table *, size_t);
-static int tnamecmp(const void *, const void *);
-static struct tbl *ktscan(struct table *, const char *, uint32_t,
-    struct tbl ***);
-
-static void
-texpand(struct table *tp, size_t nsize)
-{
-	size_t i, j, osize = tp->size, perturb;
-	struct tbl *tblp, **pp;
-	struct tbl **ntblp, **otblp = tp->tbls;
-
-	ntblp = alloc(nsize * sizeof(struct tbl *), tp->areap);
-	for (i = 0; i < nsize; i++)
-		ntblp[i] = NULL;
-	tp->size = nsize;
-	tp->nfree = (nsize * 4) / 5;	/* table can get 80% full */
-	tp->tbls = ntblp;
-	if (otblp == NULL)
-		return;
-	nsize--;			/* from here on nsize := mask */
-	for (i = 0; i < osize; i++)
-		if ((tblp = otblp[i]) != NULL) {
-			if ((tblp->flag & DEFINED)) {
-				/* search for free hash table slot */
-				j = (perturb = tblp->ua.hval) & nsize;
-				goto find_first_empty_slot;
- find_next_empty_slot:
-				j = (j << 2) + j + perturb + 1;
-				perturb >>= PERTURB_SHIFT;
- find_first_empty_slot:
-				pp = &ntblp[j & nsize];
-				if (*pp != NULL)
-					goto find_next_empty_slot;
-				/* found an empty hash table slot */
-				*pp = tblp;
-				tp->nfree--;
-			} else if (!(tblp->flag & FINUSE)) {
-				afree(tblp, tp->areap);
-			}
-		}
-	afree(otblp, tp->areap);
-}
-
-void
-ktinit(struct table *tp, Area *ap, size_t tsize)
-{
-	tp->areap = ap;
-	tp->tbls = NULL;
-	tp->size = tp->nfree = 0;
-	if (tsize)
-		texpand(tp, tsize);
-}
-
-/* table, name (key) to search for, hash(name), rv pointer to tbl ptr */
-static struct tbl *
-ktscan(struct table *tp, const char *name, uint32_t h, struct tbl ***ppp)
-{
-	size_t j, perturb, mask;
-	struct tbl **pp, *p;
-
-	mask = tp->size - 1;
-	/* search for hash table slot matching name */
-	j = (perturb = h) & mask;
-	goto find_first_slot;
- find_next_slot:
-	j = (j << 2) + j + perturb + 1;
-	perturb >>= PERTURB_SHIFT;
- find_first_slot:
-	pp = &tp->tbls[j & mask];
-	if ((p = *pp) != NULL && (p->ua.hval != h || !(p->flag & DEFINED) ||
-	    strcmp(p->name, name)))
-		goto find_next_slot;
-	/* p == NULL if not found, correct found entry otherwise */
-	if (ppp)
-		*ppp = pp;
-	return (p);
-}
-
-/* table, name (key) to search for, hash(n) */
-struct tbl *
-ktsearch(struct table *tp, const char *n, uint32_t h)
-{
-	return (tp->size ? ktscan(tp, n, h, NULL) : NULL);
-}
-
-/* table, name (key) to enter, hash(n) */
-struct tbl *
-ktenter(struct table *tp, const char *n, uint32_t h)
-{
-	struct tbl **pp, *p;
-	int len;
-
-	if (tp->size == 0)
-		texpand(tp, INIT_TBLS);
- Search:
-	if ((p = ktscan(tp, n, h, &pp)))
-		return (p);
-
-	if (tp->nfree <= 0) {
-		/* too full */
-		texpand(tp, 2 * tp->size);
-		goto Search;
-	}
-
-	/* create new tbl entry */
-	len = strlen(n) + 1;
-	p = alloc(offsetof(struct tbl, name[0]) + len, tp->areap);
-	p->flag = 0;
-	p->type = 0;
-	p->areap = tp->areap;
-	p->ua.hval = h;
-	p->u2.field = 0;
-	p->u.array = NULL;
-	memcpy(p->name, n, len);
-
-	/* enter in tp->tbls */
-	tp->nfree--;
-	*pp = p;
-	return (p);
-}
-
-void
-ktwalk(struct tstate *ts, struct table *tp)
-{
-	ts->left = tp->size;
-	ts->next = tp->tbls;
-}
-
-struct tbl *
-ktnext(struct tstate *ts)
-{
-	while (--ts->left >= 0) {
-		struct tbl *p = *ts->next++;
-		if (p != NULL && (p->flag & DEFINED))
-			return (p);
-	}
-	return (NULL);
-}
-
-static int
-tnamecmp(const void *p1, const void *p2)
-{
-	const struct tbl *a = *((const struct tbl * const *)p1);
-	const struct tbl *b = *((const struct tbl * const *)p2);
-
-	return (strcmp(a->name, b->name));
-}
-
-struct tbl **
-ktsort(struct table *tp)
-{
-	size_t i;
-	struct tbl **p, **sp, **dp;
-
-	p = alloc((tp->size + 1) * sizeof(struct tbl *), ATEMP);
-	sp = tp->tbls;		/* source */
-	dp = p;			/* dest */
-	i = (size_t)tp->size;
-	while (i--)
-		if ((*dp = *sp++) != NULL && (((*dp)->flag & DEFINED) ||
-		    ((*dp)->flag & ARRAY)))
-			dp++;
-	qsort(p, (i = dp - p), sizeof(void *), tnamecmp);
-	p[i] = NULL;
-	return (p);
-}
-
-#ifdef SIGWINCH
-static void
-x_sigwinch(int sig MKSH_A_UNUSED)
-{
-	/* this runs inside interrupt context, with errno saved */
-
-	got_winch = 1;
-}
-#endif