funcs.c revision 50012061ca3ad8e8a7f88c72130a5e22d797897e 
1/*	$OpenBSD: c_ksh.c,v 1.34 2013/12/17 16:37:05 deraadt Exp $	*/
2/*	$OpenBSD: c_sh.c,v 1.45 2014/08/27 08:26:04 jmc Exp $	*/
3/*	$OpenBSD: c_test.c,v 1.18 2009/03/01 20:11:06 otto Exp $	*/
4/*	$OpenBSD: c_ulimit.c,v 1.19 2013/11/28 10:33:37 sobrado Exp $	*/
5
6/*-
7 * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
8 *		 2010, 2011, 2012, 2013, 2014, 2015
9 *	Thorsten Glaser <tg@mirbsd.org>
10 *
11 * Provided that these terms and disclaimer and all copyright notices
12 * are retained or reproduced in an accompanying document, permission
13 * is granted to deal in this work without restriction, including un-
14 * limited rights to use, publicly perform, distribute, sell, modify,
15 * merge, give away, or sublicence.
16 *
17 * This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
18 * the utmost extent permitted by applicable law, neither express nor
19 * implied; without malicious intent or gross negligence. In no event
20 * may a licensor, author or contributor be held liable for indirect,
21 * direct, other damage, loss, or other issues arising in any way out
22 * of dealing in the work, even if advised of the possibility of such
23 * damage or existence of a defect, except proven that it results out
24 * of said person's immediate fault when using the work as intended.
25 */
26
27#include "sh.h"
28
29#if HAVE_SELECT
30#if HAVE_SYS_BSDTYPES_H
31#include <sys/bsdtypes.h>
32#endif
33#if HAVE_SYS_SELECT_H
34#include <sys/select.h>
35#endif
36#if HAVE_BSTRING_H
37#include <bstring.h>
38#endif
39#endif
40
41__RCSID("$MirOS: src/bin/mksh/funcs.c,v 1.259.2.2 2015/01/25 15:35:44 tg Exp $");
42
43#if HAVE_KILLPG
44/*
45 * use killpg if < -1 since -1 does special things
46 * for some non-killpg-endowed kills
47 */
48#define mksh_kill(p,s)	((p) < -1 ? killpg(-(p), (s)) : kill((p), (s)))
49#else
50/* cross fingers and hope kill is killpg-endowed */
51#define mksh_kill	kill
52#endif
53
54/* XXX conditions correct? */
55#if !defined(RLIM_INFINITY) && !defined(MKSH_NO_LIMITS)
56#define MKSH_NO_LIMITS	1
57#endif
58
59#ifdef MKSH_NO_LIMITS
60#define c_ulimit	c_true
61#endif
62
63#if !defined(MKSH_UNEMPLOYED) && HAVE_GETSID
64static int c_suspend(const char **);
65#endif
66
67/* getn() that prints error */
68static int
69bi_getn(const char *as, int *ai)
70{
71	int rv;
72
73	if (!(rv = getn(as, ai)))
74		bi_errorf("%s: %s", as, "bad number");
75	return (rv);
76}
77
78static int
79c_true(const char **wp MKSH_A_UNUSED)
80{
81	return (0);
82}
83
84static int
85c_false(const char **wp MKSH_A_UNUSED)
86{
87	return (1);
88}
89
90/*
91 * A leading = means assignments before command are kept.
92 * A leading * means a POSIX special builtin.
93 */
94const struct builtin mkshbuiltins[] = {
95	{"*=.", c_dot},
96	{"*=:", c_true},
97	{"[", c_test},
98	/* no =: AT&T manual wrong */
99	{Talias, c_alias},
100	{"*=break", c_brkcont},
101	{Tgbuiltin, c_builtin},
102	{"cat", c_cat},
103	{"cd", c_cd},
104	/* dash compatibility hack */
105	{"chdir", c_cd},
106	{"command", c_command},
107	{"*=continue", c_brkcont},
108	{"echo", c_print},
109	{"*=eval", c_eval},
110	{"*=exec", c_exec},
111	{"*=exit", c_exitreturn},
112	{Tsgexport, c_typeset},
113	{"false", c_false},
114	{"fc", c_fc},
115	{"getopts", c_getopts},
116	{"=global", c_typeset},
117	{"jobs", c_jobs},
118	{"kill", c_kill},
119	{"let", c_let},
120	{"let]", c_let},
121	{"print", c_print},
122	{"pwd", c_pwd},
123	{"read", c_read},
124	{Tsgreadonly, c_typeset},
125	{"realpath", c_realpath},
126	{"rename", c_rename},
127	{"*=return", c_exitreturn},
128	{Tsgset, c_set},
129	{"*=shift", c_shift},
130#if !defined(MKSH_UNEMPLOYED) && HAVE_GETSID
131	{"suspend", c_suspend},
132#endif
133	{"test", c_test},
134	{"*=times", c_times},
135	{"*=trap", c_trap},
136	{"true", c_true},
137	{T_typeset, c_typeset},
138	{"ulimit", c_ulimit},
139	{"umask", c_umask},
140	{Tunalias, c_unalias},
141	{Tsgunset, c_unset},
142	{"=wait", c_wait},
143	{"whence", c_whence},
144#ifndef MKSH_UNEMPLOYED
145	{"bg", c_fgbg},
146	{"fg", c_fgbg},
147#endif
148#ifndef MKSH_NO_CMDLINE_EDITING
149	{"bind", c_bind},
150#endif
151#if HAVE_MKNOD
152	{"mknod", c_mknod},
153#endif
154#ifdef MKSH_PRINTF_BUILTIN
155	{"printf", c_printf},
156#endif
157#if HAVE_SELECT
158	{"sleep", c_sleep},
159#endif
160#ifdef __MirBSD__
161	/* alias to "true" for historical reasons */
162	{"domainname", c_true},
163#endif
164	{NULL, (int (*)(const char **))NULL}
165};
166
167struct kill_info {
168	int num_width;
169	int name_width;
170};
171
172static const struct t_op {
173	char op_text[4];
174	Test_op op_num;
175} u_ops[] = {
176	{"-a",	TO_FILAXST },
177	{"-b",	TO_FILBDEV },
178	{"-c",	TO_FILCDEV },
179	{"-d",	TO_FILID },
180	{"-e",	TO_FILEXST },
181	{"-f",	TO_FILREG },
182	{"-G",	TO_FILGID },
183	{"-g",	TO_FILSETG },
184	{"-h",	TO_FILSYM },
185	{"-H",	TO_FILCDF },
186	{"-k",	TO_FILSTCK },
187	{"-L",	TO_FILSYM },
188	{"-n",	TO_STNZE },
189	{"-O",	TO_FILUID },
190	{"-o",	TO_OPTION },
191	{"-p",	TO_FILFIFO },
192	{"-r",	TO_FILRD },
193	{"-s",	TO_FILGZ },
194	{"-S",	TO_FILSOCK },
195	{"-t",	TO_FILTT },
196	{"-u",	TO_FILSETU },
197	{"-w",	TO_FILWR },
198	{"-x",	TO_FILEX },
199	{"-z",	TO_STZER },
200	{"",	TO_NONOP }
201};
202static const struct t_op b_ops[] = {
203	{"=",	TO_STEQL },
204	{"==",	TO_STEQL },
205	{"!=",	TO_STNEQ },
206	{"<",	TO_STLT },
207	{">",	TO_STGT },
208	{"-eq",	TO_INTEQ },
209	{"-ne",	TO_INTNE },
210	{"-gt",	TO_INTGT },
211	{"-ge",	TO_INTGE },
212	{"-lt",	TO_INTLT },
213	{"-le",	TO_INTLE },
214	{"-ef",	TO_FILEQ },
215	{"-nt",	TO_FILNT },
216	{"-ot",	TO_FILOT },
217	{"",	TO_NONOP }
218};
219
220static int test_oexpr(Test_env *, bool);
221static int test_aexpr(Test_env *, bool);
222static int test_nexpr(Test_env *, bool);
223static int test_primary(Test_env *, bool);
224static Test_op ptest_isa(Test_env *, Test_meta);
225static const char *ptest_getopnd(Test_env *, Test_op, bool);
226static void ptest_error(Test_env *, int, const char *);
227static char *kill_fmt_entry(char *, size_t, unsigned int, const void *);
228static void p_time(struct shf *, bool, long, int, int,
229    const char *, const char *);
230
231int
232c_pwd(const char **wp)
233{
234	int optc;
235	bool physical = tobool(Flag(FPHYSICAL));
236	char *p, *allocd = NULL;
237
238	while ((optc = ksh_getopt(wp, &builtin_opt, "LP")) != -1)
239		switch (optc) {
240		case 'L':
241			physical = false;
242			break;
243		case 'P':
244			physical = true;
245			break;
246		case '?':
247			return (1);
248		}
249	wp += builtin_opt.optind;
250
251	if (wp[0]) {
252		bi_errorf("too many arguments");
253		return (1);
254	}
255	p = current_wd[0] ? (physical ? allocd = do_realpath(current_wd) :
256	    current_wd) : NULL;
257	/* LINTED use of access */
258	if (p && access(p, R_OK) < 0)
259		p = NULL;
260	if (!p && !(p = allocd = ksh_get_wd())) {
261		bi_errorf("%s: %s", "can't determine current directory",
262		    cstrerror(errno));
263		return (1);
264	}
265	shprintf("%s\n", p);
266	afree(allocd, ATEMP);
267	return (0);
268}
269
270static const char *s_ptr;
271static int s_get(void);
272static void s_put(int);
273
274int
275c_print(const char **wp)
276{
277#define PO_NL		BIT(0)	/* print newline */
278#define PO_EXPAND	BIT(1)	/* expand backslash sequences */
279#define PO_PMINUSMINUS	BIT(2)	/* print a -- argument */
280#define PO_HIST		BIT(3)	/* print to history instead of stdout */
281#define PO_COPROC	BIT(4)	/* printing to coprocess: block SIGPIPE */
282	int fd = 1, c;
283	int flags = PO_EXPAND | PO_NL;
284	const char *s, *emsg;
285	XString xs;
286	char *xp;
287
288	if (wp[0][0] == 'e') {
289		/* echo builtin */
290		wp++;
291#ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT
292		if (Flag(FSH)) {
293			/*
294			 * MidnightBSD /bin/sh needs a BSD echo, that is,
295			 * one that supports -e but does not enable it by
296			 * default
297			 */
298			flags = PO_NL;
299		}
300#endif
301		if (Flag(FPOSIX) ||
302#ifndef MKSH_MIDNIGHTBSD01ASH_COMPAT
303		    Flag(FSH) ||
304#endif
305		    Flag(FAS_BUILTIN)) {
306			/* Debian Policy 10.4 compliant "echo" builtin */
307			if (*wp && !strcmp(*wp, "-n")) {
308				/* we recognise "-n" only as the first arg */
309				flags = 0;
310				wp++;
311			} else
312				/* otherwise, we print everything as-is */
313				flags = PO_NL;
314		} else {
315			int nflags = flags;
316
317			/**
318			 * a compromise between sysV and BSD echo commands:
319			 * escape sequences are enabled by default, and -n,
320			 * -e and -E are recognised if they appear in argu-
321			 * ments with no illegal options (ie, echo -nq will
322			 * print -nq).
323			 * Different from sysV echo since options are reco-
324			 * gnised, different from BSD echo since escape se-
325			 * quences are enabled by default.
326			 */
327
328			while ((s = *wp) && *s == '-' && s[1]) {
329				while (*++s)
330					if (*s == 'n')
331						nflags &= ~PO_NL;
332					else if (*s == 'e')
333						nflags |= PO_EXPAND;
334					else if (*s == 'E')
335						nflags &= ~PO_EXPAND;
336					else
337						/*
338						 * bad option: don't use
339						 * nflags, print argument
340						 */
341						break;
342
343				if (*s)
344					break;
345				wp++;
346				flags = nflags;
347			}
348		}
349	} else {
350		int optc;
351		const char *opts = "Rnprsu,";
352
353		while ((optc = ksh_getopt(wp, &builtin_opt, opts)) != -1)
354			switch (optc) {
355			case 'R':
356				/* fake BSD echo command */
357				flags |= PO_PMINUSMINUS;
358				flags &= ~PO_EXPAND;
359				opts = "ne";
360				break;
361			case 'e':
362				flags |= PO_EXPAND;
363				break;
364			case 'n':
365				flags &= ~PO_NL;
366				break;
367			case 'p':
368				if ((fd = coproc_getfd(W_OK, &emsg)) < 0) {
369					bi_errorf("%s: %s", "-p", emsg);
370					return (1);
371				}
372				break;
373			case 'r':
374				flags &= ~PO_EXPAND;
375				break;
376			case 's':
377				flags |= PO_HIST;
378				break;
379			case 'u':
380				if (!*(s = builtin_opt.optarg))
381					fd = 0;
382				else if ((fd = check_fd(s, W_OK, &emsg)) < 0) {
383					bi_errorf("%s: %s: %s", "-u", s, emsg);
384					return (1);
385				}
386				break;
387			case '?':
388				return (1);
389			}
390
391		if (!(builtin_opt.info & GI_MINUSMINUS)) {
392			/* treat a lone - like -- */
393			if (wp[builtin_opt.optind] &&
394			    ksh_isdash(wp[builtin_opt.optind]))
395				builtin_opt.optind++;
396		} else if (flags & PO_PMINUSMINUS)
397			builtin_opt.optind--;
398		wp += builtin_opt.optind;
399	}
400
401	Xinit(xs, xp, 128, ATEMP);
402
403	while (*wp != NULL) {
404		s = *wp;
405		while ((c = *s++) != '\0') {
406			Xcheck(xs, xp);
407			if ((flags & PO_EXPAND) && c == '\\') {
408				s_ptr = s;
409				c = unbksl(false, s_get, s_put);
410				s = s_ptr;
411				if (c == -1) {
412					/* rejected by generic function */
413					switch ((c = *s++)) {
414					case 'c':
415						flags &= ~PO_NL;
416						/* AT&T brain damage */
417						continue;
418					case '\0':
419						s--;
420						c = '\\';
421						break;
422					default:
423						Xput(xs, xp, '\\');
424					}
425				} else if ((unsigned int)c > 0xFF) {
426					/* generic function returned Unicode */
427					char ts[4];
428
429					ts[utf_wctomb(ts, c - 0x100)] = 0;
430					for (c = 0; ts[c]; ++c)
431						Xput(xs, xp, ts[c]);
432					continue;
433				}
434			}
435			Xput(xs, xp, c);
436		}
437		if (*++wp != NULL)
438			Xput(xs, xp, ' ');
439	}
440	if (flags & PO_NL)
441		Xput(xs, xp, '\n');
442
443	if (flags & PO_HIST) {
444		Xput(xs, xp, '\0');
445		histsave(&source->line, Xstring(xs, xp), true, false);
446		Xfree(xs, xp);
447	} else {
448		int len = Xlength(xs, xp);
449		int opipe = 0;
450
451		/*
452		 * Ensure we aren't killed by a SIGPIPE while writing to
453		 * a coprocess. AT&T ksh doesn't seem to do this (seems
454		 * to just check that the co-process is alive which is
455		 * not enough).
456		 */
457		if (coproc.write >= 0 && coproc.write == fd) {
458			flags |= PO_COPROC;
459			opipe = block_pipe();
460		}
461		for (s = Xstring(xs, xp); len > 0; ) {
462			if ((c = write(fd, s, len)) < 0) {
463				if (flags & PO_COPROC)
464					restore_pipe(opipe);
465				if (errno == EINTR) {
466					/* allow user to ^C out */
467					intrcheck();
468					if (flags & PO_COPROC)
469						opipe = block_pipe();
470					continue;
471				}
472				return (1);
473			}
474			s += c;
475			len -= c;
476		}
477		if (flags & PO_COPROC)
478			restore_pipe(opipe);
479	}
480
481	return (0);
482}
483
484static int
485s_get(void)
486{
487	return (*s_ptr++);
488}
489
490static void
491s_put(int c MKSH_A_UNUSED)
492{
493	--s_ptr;
494}
495
496int
497c_whence(const char **wp)
498{
499	struct tbl *tp;
500	const char *id;
501	bool pflag = false, vflag = false, Vflag = false;
502	int rv = 0, optc, fcflags;
503	bool iam_whence = wp[0][0] == 'w';
504	const char *opts = iam_whence ? "pv" : "pvV";
505
506	while ((optc = ksh_getopt(wp, &builtin_opt, opts)) != -1)
507		switch (optc) {
508		case 'p':
509			pflag = true;
510			break;
511		case 'v':
512			vflag = true;
513			break;
514		case 'V':
515			Vflag = true;
516			break;
517		case '?':
518			return (1);
519		}
520	wp += builtin_opt.optind;
521
522	fcflags = FC_BI | FC_PATH | FC_FUNC;
523	if (!iam_whence) {
524		/* Note that -p on its own is deal with in comexec() */
525		if (pflag)
526			fcflags |= FC_DEFPATH;
527		/*
528		 * Convert command options to whence options - note that
529		 * command -pV uses a different path search than whence -v
530		 * or whence -pv. This should be considered a feature.
531		 */
532		vflag = Vflag;
533	}
534	if (pflag)
535		fcflags &= ~(FC_BI | FC_FUNC);
536
537	while ((vflag || rv == 0) && (id = *wp++) != NULL) {
538		uint32_t h = 0;
539
540		tp = NULL;
541		if ((iam_whence || vflag) && !pflag)
542			tp = ktsearch(&keywords, id, h = hash(id));
543		if (!tp && !pflag) {
544			tp = ktsearch(&aliases, id, h ? h : hash(id));
545			if (tp && !(tp->flag & ISSET))
546				tp = NULL;
547		}
548		if (!tp)
549			tp = findcom(id, fcflags);
550		if (vflag || (tp->type != CALIAS && tp->type != CEXEC &&
551		    tp->type != CTALIAS))
552			shf_puts(id, shl_stdout);
553		if (vflag) {
554			switch (tp->type) {
555			case CKEYWD:
556			case CALIAS:
557			case CFUNC:
558			case CSHELL:
559				shf_puts(" is a", shl_stdout);
560				break;
561			}
562			switch (tp->type) {
563			case CKEYWD:
564			case CSHELL:
565			case CTALIAS:
566			case CEXEC:
567				shf_putc(' ', shl_stdout);
568				break;
569			}
570		}
571
572		switch (tp->type) {
573		case CKEYWD:
574			if (vflag)
575				shf_puts("reserved word", shl_stdout);
576			break;
577		case CALIAS:
578			if (vflag)
579				shprintf("n %s%s for ",
580				    (tp->flag & EXPORT) ? "exported " : null,
581				    Talias);
582			if (!iam_whence && !vflag)
583				shprintf("%s %s=", Talias, id);
584			print_value_quoted(shl_stdout, tp->val.s);
585			break;
586		case CFUNC:
587			if (vflag) {
588				if (tp->flag & EXPORT)
589					shf_puts("n exported", shl_stdout);
590				if (tp->flag & TRACE)
591					shf_puts(" traced", shl_stdout);
592				if (!(tp->flag & ISSET)) {
593					shf_puts(" undefined", shl_stdout);
594					if (tp->u.fpath)
595						shprintf(" (autoload from %s)",
596						    tp->u.fpath);
597				}
598				shf_puts(T_function, shl_stdout);
599			}
600			break;
601		case CSHELL:
602			if (vflag) {
603				if (tp->flag & SPEC_BI)
604					shf_puts("special ", shl_stdout);
605				shprintf("%s %s", "shell", Tbuiltin);
606			}
607			break;
608		case CTALIAS:
609		case CEXEC:
610			if (tp->flag & ISSET) {
611				if (vflag) {
612					shf_puts("is ", shl_stdout);
613					if (tp->type == CTALIAS)
614						shprintf("a tracked %s%s for ",
615						    (tp->flag & EXPORT) ?
616						    "exported " : null,
617						    Talias);
618				}
619				shf_puts(tp->val.s, shl_stdout);
620			} else {
621				if (vflag)
622					shf_puts("not found", shl_stdout);
623				rv = 1;
624			}
625			break;
626		default:
627			shf_puts(" is *GOK*", shl_stdout);
628			break;
629		}
630		if (vflag || !rv)
631			shf_putc('\n', shl_stdout);
632	}
633	return (rv);
634}
635
636/* Deal with command -vV - command -p dealt with in comexec() */
637int
638c_command(const char **wp)
639{
640	/*
641	 * Let c_whence do the work. Note that c_command() must be
642	 * a distinct function from c_whence() (tested in comexec()).
643	 */
644	return (c_whence(wp));
645}
646
647/* typeset, global, export, and readonly */
648static void c_typeset_vardump(struct tbl *, uint32_t, int, bool, bool);
649static void c_typeset_vardump_recursive(struct block *, uint32_t, int, bool,
650    bool);
651int
652c_typeset(const char **wp)
653{
654	struct tbl *vp, **p;
655	uint32_t fset = 0, fclr = 0, flag;
656	int thing = 0, field = 0, base = 0, i;
657	struct block *l;
658	const char *opts;
659	const char *fieldstr = NULL, *basestr = NULL;
660	bool localv = false, func = false, pflag = false, istset = true;
661	enum namerefflag new_refflag = SRF_NOP;
662
663	switch (**wp) {
664
665	/* export */
666	case 'e':
667		fset |= EXPORT;
668		istset = false;
669		break;
670
671	/* readonly */
672	case 'r':
673		fset |= RDONLY;
674		istset = false;
675		break;
676
677	/* set */
678	case 's':
679		/* called with 'typeset -' */
680		break;
681
682	/* typeset */
683	case 't':
684		localv = true;
685		break;
686	}
687
688	/* see comment below regarding possible opions */
689	opts = istset ? "L#R#UZ#afi#lnprtux" : "p";
690
691	builtin_opt.flags |= GF_PLUSOPT;
692	/*
693	 * AT&T ksh seems to have 0-9 as options which are multiplied
694	 * to get a number that is used with -L, -R, -Z or -i (eg, -1R2
695	 * sets right justify in a field of 12). This allows options
696	 * to be grouped in an order (eg, -Lu12), but disallows -i8 -L3 and
697	 * does not allow the number to be specified as a separate argument
698	 * Here, the number must follow the RLZi option, but is optional
699	 * (see the # kludge in ksh_getopt()).
700	 */
701	while ((i = ksh_getopt(wp, &builtin_opt, opts)) != -1) {
702		flag = 0;
703		switch (i) {
704		case 'L':
705			flag = LJUST;
706			fieldstr = builtin_opt.optarg;
707			break;
708		case 'R':
709			flag = RJUST;
710			fieldstr = builtin_opt.optarg;
711			break;
712		case 'U':
713			/*
714			 * AT&T ksh uses u, but this conflicts with
715			 * upper/lower case. If this option is changed,
716			 * need to change the -U below as well
717			 */
718			flag = INT_U;
719			break;
720		case 'Z':
721			flag = ZEROFIL;
722			fieldstr = builtin_opt.optarg;
723			break;
724		case 'a':
725			/*
726			 * this is supposed to set (-a) or unset (+a) the
727			 * indexed array attribute; it does nothing on an
728			 * existing regular string or indexed array though
729			 */
730			break;
731		case 'f':
732			func = true;
733			break;
734		case 'i':
735			flag = INTEGER;
736			basestr = builtin_opt.optarg;
737			break;
738		case 'l':
739			flag = LCASEV;
740			break;
741		case 'n':
742			new_refflag = (builtin_opt.info & GI_PLUS) ?
743			    SRF_DISABLE : SRF_ENABLE;
744			break;
745		/* export, readonly: POSIX -p flag */
746		case 'p':
747			/* typeset: show values as well */
748			pflag = true;
749			if (istset)
750				continue;
751			break;
752		case 'r':
753			flag = RDONLY;
754			break;
755		case 't':
756			flag = TRACE;
757			break;
758		case 'u':
759			/* upper case / autoload */
760			flag = UCASEV_AL;
761			break;
762		case 'x':
763			flag = EXPORT;
764			break;
765		case '?':
766			return (1);
767		}
768		if (builtin_opt.info & GI_PLUS) {
769			fclr |= flag;
770			fset &= ~flag;
771			thing = '+';
772		} else {
773			fset |= flag;
774			fclr &= ~flag;
775			thing = '-';
776		}
777	}
778
779	if (fieldstr && !bi_getn(fieldstr, &field))
780		return (1);
781	if (basestr && (!bi_getn(basestr, &base) || base < 1 || base > 36)) {
782		bi_errorf("%s: %s", "bad integer base", basestr);
783		return (1);
784	}
785
786	if (!(builtin_opt.info & GI_MINUSMINUS) && wp[builtin_opt.optind] &&
787	    (wp[builtin_opt.optind][0] == '-' ||
788	    wp[builtin_opt.optind][0] == '+') &&
789	    wp[builtin_opt.optind][1] == '\0') {
790		thing = wp[builtin_opt.optind][0];
791		builtin_opt.optind++;
792	}
793
794	if (func && (((fset|fclr) & ~(TRACE|UCASEV_AL|EXPORT)) ||
795	    new_refflag != SRF_NOP)) {
796		bi_errorf("only -t, -u and -x options may be used with -f");
797		return (1);
798	}
799	if (wp[builtin_opt.optind]) {
800		/*
801		 * Take care of exclusions.
802		 * At this point, flags in fset are cleared in fclr and vice
803		 * versa. This property should be preserved.
804		 */
805		if (fset & LCASEV)
806			/* LCASEV has priority over UCASEV_AL */
807			fset &= ~UCASEV_AL;
808		if (fset & LJUST)
809			/* LJUST has priority over RJUST */
810			fset &= ~RJUST;
811		if ((fset & (ZEROFIL|LJUST)) == ZEROFIL) {
812			/* -Z implies -ZR */
813			fset |= RJUST;
814			fclr &= ~RJUST;
815		}
816		/*
817		 * Setting these attributes clears the others, unless they
818		 * are also set in this command
819		 */
820		if ((fset & (LJUST | RJUST | ZEROFIL | UCASEV_AL | LCASEV |
821		    INTEGER | INT_U | INT_L)) || new_refflag != SRF_NOP)
822			fclr |= ~fset & (LJUST | RJUST | ZEROFIL | UCASEV_AL |
823			    LCASEV | INTEGER | INT_U | INT_L);
824	}
825	if (new_refflag != SRF_NOP) {
826		fclr &= ~(ARRAY | ASSOC);
827		fset &= ~(ARRAY | ASSOC);
828		fclr |= EXPORT;
829		fset |= ASSOC;
830		if (new_refflag == SRF_DISABLE)
831			fclr |= ASSOC;
832	}
833
834	/* set variables and attributes */
835	if (wp[builtin_opt.optind] &&
836	    /* not "typeset -p varname" */
837	    !(!func && pflag && !(fset | fclr))) {
838		int rv = 0;
839		struct tbl *f;
840
841		if (localv && !func)
842			fset |= LOCAL;
843		for (i = builtin_opt.optind; wp[i]; i++) {
844			if (func) {
845				f = findfunc(wp[i], hash(wp[i]),
846				    tobool(fset & UCASEV_AL));
847				if (!f) {
848					/* AT&T ksh does ++rv: bogus */
849					rv = 1;
850					continue;
851				}
852				if (fset | fclr) {
853					f->flag |= fset;
854					f->flag &= ~fclr;
855				} else {
856					fpFUNCTf(shl_stdout, 0,
857					    tobool(f->flag & FKSH),
858					    wp[i], f->val.t);
859					shf_putc('\n', shl_stdout);
860				}
861			} else if (!typeset(wp[i], fset, fclr, field, base)) {
862				bi_errorf("%s: %s", wp[i], "is not an identifier");
863				return (1);
864			}
865		}
866		return (rv);
867	}
868
869	/* list variables and attributes */
870
871	/* no difference at this point.. */
872	flag = fset | fclr;
873	if (func) {
874		for (l = e->loc; l; l = l->next) {
875			for (p = ktsort(&l->funs); (vp = *p++); ) {
876				if (flag && (vp->flag & flag) == 0)
877					continue;
878				if (thing == '-')
879					fpFUNCTf(shl_stdout, 0,
880					    tobool(vp->flag & FKSH),
881					    vp->name, vp->val.t);
882				else
883					shf_puts(vp->name, shl_stdout);
884				shf_putc('\n', shl_stdout);
885			}
886		}
887	} else if (wp[builtin_opt.optind]) {
888		for (i = builtin_opt.optind; wp[i]; i++) {
889			varsearch(e->loc, &vp, wp[i], hash(wp[i]));
890			c_typeset_vardump(vp, flag, thing, pflag, istset);
891		}
892	} else
893		c_typeset_vardump_recursive(e->loc, flag, thing, pflag, istset);
894	return (0);
895}
896
897static void
898c_typeset_vardump_recursive(struct block *l, uint32_t flag, int thing,
899    bool pflag, bool istset)
900{
901	struct tbl **blockvars, *vp;
902
903	if (l->next)
904		c_typeset_vardump_recursive(l->next, flag, thing, pflag, istset);
905	blockvars = ktsort(&l->vars);
906	while ((vp = *blockvars++))
907		c_typeset_vardump(vp, flag, thing, pflag, istset);
908	/*XXX doesn’t this leak? */
909}
910
911static void
912c_typeset_vardump(struct tbl *vp, uint32_t flag, int thing, bool pflag,
913    bool istset)
914{
915	struct tbl *tvp;
916	int any_set = 0;
917	char *s;
918
919	if (!vp)
920		return;
921
922	/*
923	 * See if the parameter is set (for arrays, if any
924	 * element is set).
925	 */
926	for (tvp = vp; tvp; tvp = tvp->u.array)
927		if (tvp->flag & ISSET) {
928			any_set = 1;
929			break;
930		}
931
932	/*
933	 * Check attributes - note that all array elements
934	 * have (should have?) the same attributes, so checking
935	 * the first is sufficient.
936	 *
937	 * Report an unset param only if the user has
938	 * explicitly given it some attribute (like export);
939	 * otherwise, after "echo $FOO", we would report FOO...
940	 */
941	if (!any_set && !(vp->flag & USERATTRIB))
942		return;
943	if (flag && (vp->flag & flag) == 0)
944		return;
945	if (!(vp->flag & ARRAY))
946		/* optimise later conditionals */
947		any_set = 0;
948	do {
949		/*
950		 * Ignore array elements that aren't set unless there
951		 * are no set elements, in which case the first is
952		 * reported on
953		 */
954		if (any_set && !(vp->flag & ISSET))
955			continue;
956		/* no arguments */
957		if (!thing && !flag) {
958			if (any_set == 1) {
959				shprintf("%s %s %s\n", Tset, "-A", vp->name);
960				any_set = 2;
961			}
962			/*
963			 * AT&T ksh prints things like export, integer,
964			 * leftadj, zerofill, etc., but POSIX says must
965			 * be suitable for re-entry...
966			 */
967			shprintf("%s %s", Ttypeset, "");
968			if (((vp->flag & (ARRAY | ASSOC)) == ASSOC))
969				shprintf("%s ", "-n");
970			if ((vp->flag & INTEGER))
971				shprintf("%s ", "-i");
972			if ((vp->flag & EXPORT))
973				shprintf("%s ", "-x");
974			if ((vp->flag & RDONLY))
975				shprintf("%s ", "-r");
976			if ((vp->flag & TRACE))
977				shprintf("%s ", "-t");
978			if ((vp->flag & LJUST))
979				shprintf("-L%d ", vp->u2.field);
980			if ((vp->flag & RJUST))
981				shprintf("-R%d ", vp->u2.field);
982			if ((vp->flag & ZEROFIL))
983				shprintf("%s ", "-Z");
984			if ((vp->flag & LCASEV))
985				shprintf("%s ", "-l");
986			if ((vp->flag & UCASEV_AL))
987				shprintf("%s ", "-u");
988			if ((vp->flag & INT_U))
989				shprintf("%s ", "-U");
990		} else if (pflag) {
991			shprintf("%s %s", istset ? Ttypeset :
992			    (flag & EXPORT) ? Texport : Treadonly, "");
993		}
994		if (any_set)
995			shprintf("%s[%lu]", vp->name, arrayindex(vp));
996		else
997			shf_puts(vp->name, shl_stdout);
998		if ((!thing && !flag && pflag) ||
999		    (thing == '-' && (vp->flag & ISSET))) {
1000			s = str_val(vp);
1001			shf_putc('=', shl_stdout);
1002			/* AT&T ksh can't have justified integers... */
1003			if ((vp->flag & (INTEGER | LJUST | RJUST)) == INTEGER)
1004				shf_puts(s, shl_stdout);
1005			else
1006				print_value_quoted(shl_stdout, s);
1007		}
1008		shf_putc('\n', shl_stdout);
1009
1010		/*
1011		 * Only report first 'element' of an array with
1012		 * no set elements.
1013		 */
1014		if (!any_set)
1015			return;
1016	} while ((vp = vp->u.array));
1017}
1018
1019int
1020c_alias(const char **wp)
1021{
1022	struct table *t = &aliases;
1023	int rv = 0, prefix = 0;
1024	bool rflag = false, tflag, Uflag = false, pflag = false;
1025	uint32_t xflag = 0;
1026	int optc;
1027
1028	builtin_opt.flags |= GF_PLUSOPT;
1029	while ((optc = ksh_getopt(wp, &builtin_opt, "dprtUx")) != -1) {
1030		prefix = builtin_opt.info & GI_PLUS ? '+' : '-';
1031		switch (optc) {
1032		case 'd':
1033#ifdef MKSH_NOPWNAM
1034			t = NULL;	/* fix "alias -dt" */
1035#else
1036			t = &homedirs;
1037#endif
1038			break;
1039		case 'p':
1040			pflag = true;
1041			break;
1042		case 'r':
1043			rflag = true;
1044			break;
1045		case 't':
1046			t = &taliases;
1047			break;
1048		case 'U':
1049			/*
1050			 * kludge for tracked alias initialization
1051			 * (don't do a path search, just make an entry)
1052			 */
1053			Uflag = true;
1054			break;
1055		case 'x':
1056			xflag = EXPORT;
1057			break;
1058		case '?':
1059			return (1);
1060		}
1061	}
1062#ifdef MKSH_NOPWNAM
1063	if (t == NULL)
1064		return (0);
1065#endif
1066	wp += builtin_opt.optind;
1067
1068	if (!(builtin_opt.info & GI_MINUSMINUS) && *wp &&
1069	    (wp[0][0] == '-' || wp[0][0] == '+') && wp[0][1] == '\0') {
1070		prefix = wp[0][0];
1071		wp++;
1072	}
1073
1074	tflag = t == &taliases;
1075
1076	/* "hash -r" means reset all the tracked aliases.. */
1077	if (rflag) {
1078		static const char *args[] = {
1079			Tunalias, "-ta", NULL
1080		};
1081
1082		if (!tflag || *wp) {
1083			shprintf("%s: -r flag can only be used with -t"
1084			    " and without arguments\n", Talias);
1085			return (1);
1086		}
1087		ksh_getopt_reset(&builtin_opt, GF_ERROR);
1088		return (c_unalias(args));
1089	}
1090
1091	if (*wp == NULL) {
1092		struct tbl *ap, **p;
1093
1094		for (p = ktsort(t); (ap = *p++) != NULL; )
1095			if ((ap->flag & (ISSET|xflag)) == (ISSET|xflag)) {
1096				if (pflag)
1097					shprintf("%s ", Talias);
1098				shf_puts(ap->name, shl_stdout);
1099				if (prefix != '+') {
1100					shf_putc('=', shl_stdout);
1101					print_value_quoted(shl_stdout, ap->val.s);
1102				}
1103				shf_putc('\n', shl_stdout);
1104			}
1105	}
1106
1107	for (; *wp != NULL; wp++) {
1108		const char *alias = *wp, *val, *newval;
1109		char *xalias = NULL;
1110		struct tbl *ap;
1111		uint32_t h;
1112
1113		if ((val = cstrchr(alias, '='))) {
1114			strndupx(xalias, alias, val++ - alias, ATEMP);
1115			alias = xalias;
1116		}
1117		h = hash(alias);
1118		if (val == NULL && !tflag && !xflag) {
1119			ap = ktsearch(t, alias, h);
1120			if (ap != NULL && (ap->flag&ISSET)) {
1121				if (pflag)
1122					shprintf("%s ", Talias);
1123				shf_puts(ap->name, shl_stdout);
1124				if (prefix != '+') {
1125					shf_putc('=', shl_stdout);
1126					print_value_quoted(shl_stdout, ap->val.s);
1127				}
1128				shf_putc('\n', shl_stdout);
1129			} else {
1130				shprintf("%s %s %s\n", alias, Talias,
1131				    "not found");
1132				rv = 1;
1133			}
1134			continue;
1135		}
1136		ap = ktenter(t, alias, h);
1137		ap->type = tflag ? CTALIAS : CALIAS;
1138		/* Are we setting the value or just some flags? */
1139		if ((val && !tflag) || (!val && tflag && !Uflag)) {
1140			if (ap->flag&ALLOC) {
1141				ap->flag &= ~(ALLOC|ISSET);
1142				afree(ap->val.s, APERM);
1143			}
1144			/* ignore values for -t (AT&T ksh does this) */
1145			newval = tflag ?
1146			    search_path(alias, path, X_OK, NULL) :
1147			    val;
1148			if (newval) {
1149				strdupx(ap->val.s, newval, APERM);
1150				ap->flag |= ALLOC|ISSET;
1151			} else
1152				ap->flag &= ~ISSET;
1153		}
1154		ap->flag |= DEFINED;
1155		if (prefix == '+')
1156			ap->flag &= ~xflag;
1157		else
1158			ap->flag |= xflag;
1159		afree(xalias, ATEMP);
1160	}
1161
1162	return (rv);
1163}
1164
1165int
1166c_unalias(const char **wp)
1167{
1168	struct table *t = &aliases;
1169	struct tbl *ap;
1170	int optc, rv = 0;
1171	bool all = false;
1172
1173	while ((optc = ksh_getopt(wp, &builtin_opt, "adt")) != -1)
1174		switch (optc) {
1175		case 'a':
1176			all = true;
1177			break;
1178		case 'd':
1179#ifdef MKSH_NOPWNAM
1180			/* fix "unalias -dt" */
1181			t = NULL;
1182#else
1183			t = &homedirs;
1184#endif
1185			break;
1186		case 't':
1187			t = &taliases;
1188			break;
1189		case '?':
1190			return (1);
1191		}
1192#ifdef MKSH_NOPWNAM
1193	if (t == NULL)
1194		return (0);
1195#endif
1196	wp += builtin_opt.optind;
1197
1198	for (; *wp != NULL; wp++) {
1199		ap = ktsearch(t, *wp, hash(*wp));
1200		if (ap == NULL) {
1201			/* POSIX */
1202			rv = 1;
1203			continue;
1204		}
1205		if (ap->flag&ALLOC) {
1206			ap->flag &= ~(ALLOC|ISSET);
1207			afree(ap->val.s, APERM);
1208		}
1209		ap->flag &= ~(DEFINED|ISSET|EXPORT);
1210	}
1211
1212	if (all) {
1213		struct tstate ts;
1214
1215		for (ktwalk(&ts, t); (ap = ktnext(&ts)); ) {
1216			if (ap->flag&ALLOC) {
1217				ap->flag &= ~(ALLOC|ISSET);
1218				afree(ap->val.s, APERM);
1219			}
1220			ap->flag &= ~(DEFINED|ISSET|EXPORT);
1221		}
1222	}
1223
1224	return (rv);
1225}
1226
1227int
1228c_let(const char **wp)
1229{
1230	int rv = 1;
1231	mksh_ari_t val;
1232
1233	if (wp[1] == NULL)
1234		/* AT&T ksh does this */
1235		bi_errorf("no arguments");
1236	else
1237		for (wp++; *wp; wp++)
1238			if (!evaluate(*wp, &val, KSH_RETURN_ERROR, true)) {
1239				/* distinguish error from zero result */
1240				rv = 2;
1241				break;
1242			} else
1243				rv = val == 0;
1244	return (rv);
1245}
1246
1247int
1248c_jobs(const char **wp)
1249{
1250	int optc, flag = 0, nflag = 0, rv = 0;
1251
1252	while ((optc = ksh_getopt(wp, &builtin_opt, "lpnz")) != -1)
1253		switch (optc) {
1254		case 'l':
1255			flag = 1;
1256			break;
1257		case 'p':
1258			flag = 2;
1259			break;
1260		case 'n':
1261			nflag = 1;
1262			break;
1263		case 'z':
1264			/* debugging: print zombies */
1265			nflag = -1;
1266			break;
1267		case '?':
1268			return (1);
1269		}
1270	wp += builtin_opt.optind;
1271	if (!*wp) {
1272		if (j_jobs(NULL, flag, nflag))
1273			rv = 1;
1274	} else {
1275		for (; *wp; wp++)
1276			if (j_jobs(*wp, flag, nflag))
1277				rv = 1;
1278	}
1279	return (rv);
1280}
1281
1282#ifndef MKSH_UNEMPLOYED
1283int
1284c_fgbg(const char **wp)
1285{
1286	bool bg = strcmp(*wp, "bg") == 0;
1287	int rv = 0;
1288
1289	if (!Flag(FMONITOR)) {
1290		bi_errorf("job control not enabled");
1291		return (1);
1292	}
1293	if (ksh_getopt(wp, &builtin_opt, null) == '?')
1294		return (1);
1295	wp += builtin_opt.optind;
1296	if (*wp)
1297		for (; *wp; wp++)
1298			rv = j_resume(*wp, bg);
1299	else
1300		rv = j_resume("%%", bg);
1301	return (bg ? 0 : rv);
1302}
1303#endif
1304
1305/* format a single kill item */
1306static char *
1307kill_fmt_entry(char *buf, size_t buflen, unsigned int i, const void *arg)
1308{
1309	const struct kill_info *ki = (const struct kill_info *)arg;
1310
1311	i++;
1312	shf_snprintf(buf, buflen, "%*u %*s %s",
1313	    ki->num_width, i,
1314	    ki->name_width, sigtraps[i].name,
1315	    sigtraps[i].mess);
1316	return (buf);
1317}
1318
1319int
1320c_kill(const char **wp)
1321{
1322	Trap *t = NULL;
1323	const char *p;
1324	bool lflag = false;
1325	int i, n, rv, sig;
1326
1327	/* assume old style options if -digits or -UPPERCASE */
1328	if ((p = wp[1]) && *p == '-' && (ksh_isdigit(p[1]) ||
1329	    ksh_isupper(p[1]))) {
1330		if (!(t = gettrap(p + 1, false))) {
1331			bi_errorf("bad signal '%s'", p + 1);
1332			return (1);
1333		}
1334		i = (wp[2] && strcmp(wp[2], "--") == 0) ? 3 : 2;
1335	} else {
1336		int optc;
1337
1338		while ((optc = ksh_getopt(wp, &builtin_opt, "ls:")) != -1)
1339			switch (optc) {
1340			case 'l':
1341				lflag = true;
1342				break;
1343			case 's':
1344				if (!(t = gettrap(builtin_opt.optarg, true))) {
1345					bi_errorf("bad signal '%s'",
1346					    builtin_opt.optarg);
1347					return (1);
1348				}
1349				break;
1350			case '?':
1351				return (1);
1352			}
1353		i = builtin_opt.optind;
1354	}
1355	if ((lflag && t) || (!wp[i] && !lflag)) {
1356#ifndef MKSH_SMALL
1357		shf_puts("usage:\tkill [-s signame | -signum | -signame]"
1358		    " { job | pid | pgrp } ...\n"
1359		    "\tkill -l [exit_status ...]\n", shl_out);
1360#endif
1361		bi_errorfz();
1362		return (1);
1363	}
1364
1365	if (lflag) {
1366		if (wp[i]) {
1367			for (; wp[i]; i++) {
1368				if (!bi_getn(wp[i], &n))
1369					return (1);
1370#if (NSIG < 128)
1371				if (n > 128 && n < 128 + NSIG)
1372					n -= 128;
1373#endif
1374				if (n > 0 && n < NSIG)
1375					shprintf("%s\n", sigtraps[n].name);
1376				else
1377					shprintf("%d\n", n);
1378			}
1379		} else {
1380			ssize_t w, mess_cols, mess_octs;
1381			int j;
1382			struct kill_info ki;
1383
1384			for (j = NSIG, ki.num_width = 1; j >= 10; j /= 10)
1385				ki.num_width++;
1386			ki.name_width = mess_cols = mess_octs = 0;
1387			for (j = 0; j < NSIG; j++) {
1388				w = strlen(sigtraps[j].name);
1389				if (w > ki.name_width)
1390					ki.name_width = w;
1391				w = strlen(sigtraps[j].mess);
1392				if (w > mess_octs)
1393					mess_octs = w;
1394				w = utf_mbswidth(sigtraps[j].mess);
1395				if (w > mess_cols)
1396					mess_cols = w;
1397			}
1398
1399			print_columns(shl_stdout, (unsigned int)(NSIG - 1),
1400			    kill_fmt_entry, (void *)&ki,
1401			    ki.num_width + 1 + ki.name_width + 1 + mess_octs,
1402			    ki.num_width + 1 + ki.name_width + 1 + mess_cols,
1403			    true);
1404		}
1405		return (0);
1406	}
1407	rv = 0;
1408	sig = t ? t->signal : SIGTERM;
1409	for (; (p = wp[i]); i++) {
1410		if (*p == '%') {
1411			if (j_kill(p, sig))
1412				rv = 1;
1413		} else if (!getn(p, &n)) {
1414			bi_errorf("%s: %s", p,
1415			    "arguments must be jobs or process IDs");
1416			rv = 1;
1417		} else {
1418			if (mksh_kill(n, sig) < 0) {
1419				bi_errorf("%s: %s", p, cstrerror(errno));
1420				rv = 1;
1421			}
1422		}
1423	}
1424	return (rv);
1425}
1426
1427void
1428getopts_reset(int val)
1429{
1430	if (val >= 1) {
1431		ksh_getopt_reset(&user_opt, GF_NONAME | GF_PLUSOPT);
1432		user_opt.optind = user_opt.uoptind = val;
1433	}
1434}
1435
1436int
1437c_getopts(const char **wp)
1438{
1439	int argc, optc, rv;
1440	const char *opts, *var;
1441	char buf[3];
1442	struct tbl *vq, *voptarg;
1443
1444	if (ksh_getopt(wp, &builtin_opt, null) == '?')
1445		return (1);
1446	wp += builtin_opt.optind;
1447
1448	opts = *wp++;
1449	if (!opts) {
1450		bi_errorf("missing %s argument", "options");
1451		return (1);
1452	}
1453
1454	var = *wp++;
1455	if (!var) {
1456		bi_errorf("missing %s argument", "name");
1457		return (1);
1458	}
1459	if (!*var || *skip_varname(var, true)) {
1460		bi_errorf("%s: %s", var, "is not an identifier");
1461		return (1);
1462	}
1463
1464	if (e->loc->next == NULL) {
1465		internal_warningf("%s: %s", "c_getopts", "no argv");
1466		return (1);
1467	}
1468	/* Which arguments are we parsing... */
1469	if (*wp == NULL)
1470		wp = e->loc->next->argv;
1471	else
1472		*--wp = e->loc->next->argv[0];
1473
1474	/* Check that our saved state won't cause a core dump... */
1475	for (argc = 0; wp[argc]; argc++)
1476		;
1477	if (user_opt.optind > argc ||
1478	    (user_opt.p != 0 &&
1479	    user_opt.p > strlen(wp[user_opt.optind - 1]))) {
1480		bi_errorf("arguments changed since last call");
1481		return (1);
1482	}
1483
1484	user_opt.optarg = NULL;
1485	optc = ksh_getopt(wp, &user_opt, opts);
1486
1487	if (optc >= 0 && optc != '?' && (user_opt.info & GI_PLUS)) {
1488		buf[0] = '+';
1489		buf[1] = optc;
1490		buf[2] = '\0';
1491	} else {
1492		/*
1493		 * POSIX says var is set to ? at end-of-options, AT&T ksh
1494		 * sets it to null - we go with POSIX...
1495		 */
1496		buf[0] = optc < 0 ? '?' : optc;
1497		buf[1] = '\0';
1498	}
1499
1500	/* AT&T ksh93 in fact does change OPTIND for unknown options too */
1501	user_opt.uoptind = user_opt.optind;
1502
1503	voptarg = global("OPTARG");
1504	/* AT&T ksh clears ro and int */
1505	voptarg->flag &= ~RDONLY;
1506	/* Paranoia: ensure no bizarre results. */
1507	if (voptarg->flag & INTEGER)
1508	    typeset("OPTARG", 0, INTEGER, 0, 0);
1509	if (user_opt.optarg == NULL)
1510		unset(voptarg, 1);
1511	else
1512		/* This can't fail (have cleared readonly/integer) */
1513		setstr(voptarg, user_opt.optarg, KSH_RETURN_ERROR);
1514
1515	rv = 0;
1516
1517	vq = global(var);
1518	/* Error message already printed (integer, readonly) */
1519	if (!setstr(vq, buf, KSH_RETURN_ERROR))
1520		rv = 2;
1521	if (Flag(FEXPORT))
1522		typeset(var, EXPORT, 0, 0, 0);
1523
1524	return (optc < 0 ? 1 : rv);
1525}
1526
1527#ifndef MKSH_NO_CMDLINE_EDITING
1528int
1529c_bind(const char **wp)
1530{
1531	int optc, rv = 0;
1532#ifndef MKSH_SMALL
1533	bool macro = false;
1534#endif
1535	bool list = false;
1536	const char *cp;
1537	char *up;
1538
1539	while ((optc = ksh_getopt(wp, &builtin_opt,
1540#ifndef MKSH_SMALL
1541	    "lm"
1542#else
1543	    "l"
1544#endif
1545	    )) != -1)
1546		switch (optc) {
1547		case 'l':
1548			list = true;
1549			break;
1550#ifndef MKSH_SMALL
1551		case 'm':
1552			macro = true;
1553			break;
1554#endif
1555		case '?':
1556			return (1);
1557		}
1558	wp += builtin_opt.optind;
1559
1560	if (*wp == NULL)
1561		/* list all */
1562		rv = x_bind(NULL, NULL,
1563#ifndef MKSH_SMALL
1564		    false,
1565#endif
1566		    list);
1567
1568	for (; *wp != NULL; wp++) {
1569		if ((cp = cstrchr(*wp, '=')) == NULL)
1570			up = NULL;
1571		else {
1572			strdupx(up, *wp, ATEMP);
1573			up[cp++ - *wp] = '\0';
1574		}
1575		if (x_bind(up ? up : *wp, cp,
1576#ifndef MKSH_SMALL
1577		    macro,
1578#endif
1579		    false))
1580			rv = 1;
1581		afree(up, ATEMP);
1582	}
1583
1584	return (rv);
1585}
1586#endif
1587
1588int
1589c_shift(const char **wp)
1590{
1591	struct block *l = e->loc;
1592	int n;
1593	mksh_ari_t val;
1594	const char *arg;
1595
1596	if (ksh_getopt(wp, &builtin_opt, null) == '?')
1597		return (1);
1598	arg = wp[builtin_opt.optind];
1599
1600	if (!arg)
1601		n = 1;
1602	else if (!evaluate(arg, &val, KSH_RETURN_ERROR, false)) {
1603		/* error already printed */
1604		bi_errorfz();
1605		return (1);
1606	} else if (!(n = val)) {
1607		/* nothing to do */
1608		return (0);
1609	} else if (n < 0) {
1610		bi_errorf("%s: %s", arg, "bad number");
1611		return (1);
1612	}
1613	if (l->argc < n) {
1614		bi_errorf("nothing to shift");
1615		return (1);
1616	}
1617	l->argv[n] = l->argv[0];
1618	l->argv += n;
1619	l->argc -= n;
1620	return (0);
1621}
1622
1623int
1624c_umask(const char **wp)
1625{
1626	int i, optc;
1627	const char *cp;
1628	bool symbolic = false;
1629	mode_t old_umask;
1630
1631	while ((optc = ksh_getopt(wp, &builtin_opt, "S")) != -1)
1632		switch (optc) {
1633		case 'S':
1634			symbolic = true;
1635			break;
1636		case '?':
1637			return (1);
1638		}
1639	cp = wp[builtin_opt.optind];
1640	if (cp == NULL) {
1641		old_umask = umask((mode_t)0);
1642		umask(old_umask);
1643		if (symbolic) {
1644			char buf[18], *p;
1645			int j;
1646
1647			old_umask = ~old_umask;
1648			p = buf;
1649			for (i = 0; i < 3; i++) {
1650				*p++ = "ugo"[i];
1651				*p++ = '=';
1652				for (j = 0; j < 3; j++)
1653					if (old_umask & (1 << (8 - (3*i + j))))
1654						*p++ = "rwx"[j];
1655				*p++ = ',';
1656			}
1657			p[-1] = '\0';
1658			shprintf("%s\n", buf);
1659		} else
1660			shprintf("%#3.3o\n", (unsigned int)old_umask);
1661	} else {
1662		mode_t new_umask;
1663
1664		if (ksh_isdigit(*cp)) {
1665			for (new_umask = 0; *cp >= '0' && *cp <= '7'; cp++)
1666				new_umask = new_umask * 8 + (*cp - '0');
1667			if (*cp) {
1668				bi_errorf("bad number");
1669				return (1);
1670			}
1671		} else {
1672			/* symbolic format */
1673			int positions, new_val;
1674			char op;
1675
1676			old_umask = umask((mode_t)0);
1677			/* in case of error */
1678			umask(old_umask);
1679			old_umask = ~old_umask;
1680			new_umask = old_umask;
1681			positions = 0;
1682			while (*cp) {
1683				while (*cp && vstrchr("augo", *cp))
1684					switch (*cp++) {
1685					case 'a':
1686						positions |= 0111;
1687						break;
1688					case 'u':
1689						positions |= 0100;
1690						break;
1691					case 'g':
1692						positions |= 0010;
1693						break;
1694					case 'o':
1695						positions |= 0001;
1696						break;
1697					}
1698				if (!positions)
1699					/* default is a */
1700					positions = 0111;
1701				if (!vstrchr("=+-", op = *cp))
1702					break;
1703				cp++;
1704				new_val = 0;
1705				while (*cp && vstrchr("rwxugoXs", *cp))
1706					switch (*cp++) {
1707					case 'r': new_val |= 04; break;
1708					case 'w': new_val |= 02; break;
1709					case 'x': new_val |= 01; break;
1710					case 'u':
1711						new_val |= old_umask >> 6;
1712						break;
1713					case 'g':
1714						new_val |= old_umask >> 3;
1715						break;
1716					case 'o':
1717						new_val |= old_umask >> 0;
1718						break;
1719					case 'X':
1720						if (old_umask & 0111)
1721							new_val |= 01;
1722						break;
1723					case 's':
1724						/* ignored */
1725						break;
1726					}
1727				new_val = (new_val & 07) * positions;
1728				switch (op) {
1729				case '-':
1730					new_umask &= ~new_val;
1731					break;
1732				case '=':
1733					new_umask = new_val |
1734					    (new_umask & ~(positions * 07));
1735					break;
1736				case '+':
1737					new_umask |= new_val;
1738				}
1739				if (*cp == ',') {
1740					positions = 0;
1741					cp++;
1742				} else if (!vstrchr("=+-", *cp))
1743					break;
1744			}
1745			if (*cp) {
1746				bi_errorf("bad mask");
1747				return (1);
1748			}
1749			new_umask = ~new_umask;
1750		}
1751		umask(new_umask);
1752	}
1753	return (0);
1754}
1755
1756int
1757c_dot(const char **wp)
1758{
1759	const char *file, *cp, **argv;
1760	int argc, i, errcode;
1761
1762	if (ksh_getopt(wp, &builtin_opt, null) == '?')
1763		return (1);
1764
1765	if ((cp = wp[builtin_opt.optind]) == NULL) {
1766		bi_errorf("missing argument");
1767		return (1);
1768	}
1769	if ((file = search_path(cp, path, R_OK, &errcode)) == NULL) {
1770		bi_errorf("%s: %s", cp, cstrerror(errcode));
1771		return (1);
1772	}
1773
1774	/* Set positional parameters? */
1775	if (wp[builtin_opt.optind + 1]) {
1776		argv = wp + builtin_opt.optind;
1777		/* preserve $0 */
1778		argv[0] = e->loc->argv[0];
1779		for (argc = 0; argv[argc + 1]; argc++)
1780			;
1781	} else {
1782		argc = 0;
1783		argv = NULL;
1784	}
1785	if ((i = include(file, argc, argv, false)) < 0) {
1786		/* should not happen */
1787		bi_errorf("%s: %s", cp, cstrerror(errno));
1788		return (1);
1789	}
1790	return (i);
1791}
1792
1793int
1794c_wait(const char **wp)
1795{
1796	int rv = 0, sig;
1797
1798	if (ksh_getopt(wp, &builtin_opt, null) == '?')
1799		return (1);
1800	wp += builtin_opt.optind;
1801	if (*wp == NULL) {
1802		while (waitfor(NULL, &sig) >= 0)
1803			;
1804		rv = sig;
1805	} else {
1806		for (; *wp; wp++)
1807			rv = waitfor(*wp, &sig);
1808		if (rv < 0)
1809			/* magic exit code: bad job-id */
1810			rv = sig ? sig : 127;
1811	}
1812	return (rv);
1813}
1814
1815static char REPLY[] = "REPLY";
1816int
1817c_read(const char **wp)
1818{
1819#define is_ifsws(c) (ctype((c), C_IFS) && ctype((c), C_IFSWS))
1820	int c, fd = 0, rv = 0, lastparm = 0;
1821	bool savehist = false, intoarray = false, aschars = false;
1822	bool rawmode = false, expanding = false;
1823	enum { LINES, BYTES, UPTO, READALL } readmode = LINES;
1824	char delim = '\n';
1825	size_t bytesleft = 128, bytesread;
1826	struct tbl *vp /* FU gcc */ = NULL, *vq;
1827	char *cp, *allocd = NULL, *xp;
1828	const char *ccp;
1829	XString xs;
1830	size_t xsave = 0;
1831	mksh_ttyst tios;
1832	bool restore_tios = false;
1833#if HAVE_SELECT
1834	bool hastimeout = false;
1835	struct timeval tv, tvlim;
1836#define c_read_opts "Aad:N:n:prst:u,"
1837#else
1838#define c_read_opts "Aad:N:n:prsu,"
1839#endif
1840
1841	while ((c = ksh_getopt(wp, &builtin_opt, c_read_opts)) != -1)
1842	switch (c) {
1843	case 'a':
1844		aschars = true;
1845		/* FALLTHROUGH */
1846	case 'A':
1847		intoarray = true;
1848		break;
1849	case 'd':
1850		delim = builtin_opt.optarg[0];
1851		break;
1852	case 'N':
1853	case 'n':
1854		readmode = c == 'N' ? BYTES : UPTO;
1855		if (!bi_getn(builtin_opt.optarg, &c))
1856			return (2);
1857		if (c == -1) {
1858			readmode = READALL;
1859			bytesleft = 1024;
1860		} else
1861			bytesleft = (unsigned int)c;
1862		break;
1863	case 'p':
1864		if ((fd = coproc_getfd(R_OK, &ccp)) < 0) {
1865			bi_errorf("%s: %s", "-p", ccp);
1866			return (2);
1867		}
1868		break;
1869	case 'r':
1870		rawmode = true;
1871		break;
1872	case 's':
1873		savehist = true;
1874		break;
1875#if HAVE_SELECT
1876	case 't':
1877		if (parse_usec(builtin_opt.optarg, &tv)) {
1878			bi_errorf("%s: %s '%s'", Tsynerr, cstrerror(errno),
1879			    builtin_opt.optarg);
1880			return (2);
1881		}
1882		hastimeout = true;
1883		break;
1884#endif
1885	case 'u':
1886		if (!builtin_opt.optarg[0])
1887			fd = 0;
1888		else if ((fd = check_fd(builtin_opt.optarg, R_OK, &ccp)) < 0) {
1889			bi_errorf("%s: %s: %s", "-u", builtin_opt.optarg, ccp);
1890			return (2);
1891		}
1892		break;
1893	case '?':
1894		return (2);
1895	}
1896	wp += builtin_opt.optind;
1897	if (*wp == NULL)
1898		*--wp = REPLY;
1899
1900	if (intoarray && wp[1] != NULL) {
1901		bi_errorf("too many arguments");
1902		return (2);
1903	}
1904
1905	if ((ccp = cstrchr(*wp, '?')) != NULL) {
1906		strdupx(allocd, *wp, ATEMP);
1907		allocd[ccp - *wp] = '\0';
1908		*wp = allocd;
1909		if (isatty(fd)) {
1910			/*
1911			 * AT&T ksh says it prints prompt on fd if it's open
1912			 * for writing and is a tty, but it doesn't do it
1913			 * (it also doesn't check the interactive flag,
1914			 * as is indicated in the Korn Shell book).
1915			 */
1916			shf_puts(ccp + 1, shl_out);
1917			shf_flush(shl_out);
1918		}
1919	}
1920
1921	Xinit(xs, xp, bytesleft, ATEMP);
1922
1923	if (readmode == LINES)
1924		bytesleft = 1;
1925	else if (isatty(fd)) {
1926		x_mkraw(fd, &tios, true);
1927		restore_tios = true;
1928	}
1929
1930#if HAVE_SELECT
1931	if (hastimeout) {
1932		mksh_TIME(tvlim);
1933		timeradd(&tvlim, &tv, &tvlim);
1934	}
1935#endif
1936
1937 c_read_readloop:
1938#if HAVE_SELECT
1939	if (hastimeout) {
1940		fd_set fdset;
1941
1942		FD_ZERO(&fdset);
1943		FD_SET((unsigned int)fd, &fdset);
1944		mksh_TIME(tv);
1945		timersub(&tvlim, &tv, &tv);
1946		if (tv.tv_sec < 0) {
1947			/* timeout expired globally */
1948			rv = 1;
1949			goto c_read_out;
1950		}
1951
1952		switch (select(fd + 1, &fdset, NULL, NULL, &tv)) {
1953		case 1:
1954			break;
1955		case 0:
1956			/* timeout expired for this call */
1957			rv = 1;
1958			goto c_read_out;
1959		default:
1960			bi_errorf("%s: %s", Tselect, cstrerror(errno));
1961			rv = 2;
1962			goto c_read_out;
1963		}
1964	}
1965#endif
1966
1967	bytesread = blocking_read(fd, xp, bytesleft);
1968	if (bytesread == (size_t)-1) {
1969		/* interrupted */
1970		if (errno == EINTR && fatal_trap_check()) {
1971			/*
1972			 * Was the offending signal one that would
1973			 * normally kill a process? If so, pretend
1974			 * the read was killed.
1975			 */
1976			rv = 2;
1977			goto c_read_out;
1978		}
1979		/* just ignore the signal */
1980		goto c_read_readloop;
1981	}
1982
1983	switch (readmode) {
1984	case READALL:
1985		if (bytesread == 0) {
1986			/* end of file reached */
1987			rv = 1;
1988			goto c_read_readdone;
1989		}
1990		xp += bytesread;
1991		XcheckN(xs, xp, bytesleft);
1992		break;
1993
1994	case UPTO:
1995		if (bytesread == 0)
1996			/* end of file reached */
1997			rv = 1;
1998		xp += bytesread;
1999		goto c_read_readdone;
2000
2001	case BYTES:
2002		if (bytesread == 0) {
2003			/* end of file reached */
2004			rv = 1;
2005			xp = Xstring(xs, xp);
2006			goto c_read_readdone;
2007		}
2008		xp += bytesread;
2009		if ((bytesleft -= bytesread) == 0)
2010			goto c_read_readdone;
2011		break;
2012	case LINES:
2013		if (bytesread == 0) {
2014			/* end of file reached */
2015			rv = 1;
2016			goto c_read_readdone;
2017		}
2018		if ((c = *xp) == '\0' && !aschars && delim != '\0') {
2019			/* skip any read NULs unless delimiter */
2020			break;
2021		}
2022		if (expanding) {
2023			expanding = false;
2024			if (c == delim) {
2025				if (Flag(FTALKING_I) && isatty(fd)) {
2026					/*
2027					 * set prompt in case this is
2028					 * called from .profile or $ENV
2029					 */
2030					set_prompt(PS2, NULL);
2031					pprompt(prompt, 0);
2032				}
2033				/* drop the backslash */
2034				--xp;
2035				/* and the delimiter */
2036				break;
2037			}
2038		} else if (c == delim) {
2039			goto c_read_readdone;
2040		} else if (!rawmode && c == '\\') {
2041			expanding = true;
2042		}
2043		Xcheck(xs, xp);
2044		++xp;
2045		break;
2046	}
2047	goto c_read_readloop;
2048
2049 c_read_readdone:
2050	bytesread = Xlength(xs, xp);
2051	Xput(xs, xp, '\0');
2052
2053	/*-
2054	 * state: we finished reading the input and NUL terminated it
2055	 * Xstring(xs, xp) -> xp-1 = input string without trailing delim
2056	 * rv = 1 if EOF, 0 otherwise (errors handled already)
2057	 */
2058
2059	if (rv == 1) {
2060		/* clean up coprocess if needed, on EOF */
2061		coproc_read_close(fd);
2062		if (readmode == READALL)
2063			/* EOF is no error here */
2064			rv = 0;
2065	}
2066
2067	if (savehist)
2068		histsave(&source->line, Xstring(xs, xp), true, false);
2069
2070	ccp = cp = Xclose(xs, xp);
2071	expanding = false;
2072	XinitN(xs, 128, ATEMP);
2073	if (intoarray) {
2074		vp = global(*wp);
2075		if (vp->flag & RDONLY) {
2076 c_read_splitro:
2077			bi_errorf("read-only: %s", *wp);
2078 c_read_spliterr:
2079			rv = 2;
2080			afree(cp, ATEMP);
2081			goto c_read_out;
2082		}
2083		/* exporting an array is currently pointless */
2084		unset(vp, 1);
2085		/* counter for array index */
2086		c = 0;
2087	}
2088	if (!aschars) {
2089		/* skip initial IFS whitespace */
2090		while (bytesread && is_ifsws(*ccp)) {
2091			++ccp;
2092			--bytesread;
2093		}
2094		/* trim trailing IFS whitespace */
2095		while (bytesread && is_ifsws(ccp[bytesread - 1])) {
2096			--bytesread;
2097		}
2098	}
2099 c_read_splitloop:
2100	xp = Xstring(xs, xp);
2101	/* generate next word */
2102	if (!bytesread) {
2103		/* no more input */
2104		if (intoarray)
2105			goto c_read_splitdone;
2106		/* zero out next parameters */
2107		goto c_read_gotword;
2108	}
2109	if (aschars) {
2110		Xput(xs, xp, '1');
2111		Xput(xs, xp, '#');
2112		bytesleft = utf_ptradj(ccp);
2113		while (bytesleft && bytesread) {
2114			*xp++ = *ccp++;
2115			--bytesleft;
2116			--bytesread;
2117		}
2118		if (xp[-1] == '\0') {
2119			xp[-1] = '0';
2120			xp[-3] = '2';
2121		}
2122		goto c_read_gotword;
2123	}
2124
2125	if (!intoarray && wp[1] == NULL)
2126		lastparm = 1;
2127
2128 c_read_splitlast:
2129	/* copy until IFS character */
2130	while (bytesread) {
2131		char ch;
2132
2133		ch = *ccp;
2134		if (expanding) {
2135			expanding = false;
2136			goto c_read_splitcopy;
2137		} else if (ctype(ch, C_IFS)) {
2138			break;
2139		} else if (!rawmode && ch == '\\') {
2140			expanding = true;
2141		} else {
2142 c_read_splitcopy:
2143			Xcheck(xs, xp);
2144			Xput(xs, xp, ch);
2145		}
2146		++ccp;
2147		--bytesread;
2148	}
2149	xsave = Xsavepos(xs, xp);
2150	/* copy word delimiter: IFSWS+IFS,IFSWS */
2151	while (bytesread) {
2152		char ch;
2153
2154		ch = *ccp;
2155		if (!ctype(ch, C_IFS))
2156			break;
2157		Xcheck(xs, xp);
2158		Xput(xs, xp, ch);
2159		++ccp;
2160		--bytesread;
2161		if (!ctype(ch, C_IFSWS))
2162			break;
2163	}
2164	while (bytesread && is_ifsws(*ccp)) {
2165		Xcheck(xs, xp);
2166		Xput(xs, xp, *ccp);
2167		++ccp;
2168		--bytesread;
2169	}
2170	/* if no more parameters, rinse and repeat */
2171	if (lastparm && bytesread) {
2172		++lastparm;
2173		goto c_read_splitlast;
2174	}
2175	/* get rid of the delimiter unless we pack the rest */
2176	if (lastparm < 2)
2177		xp = Xrestpos(xs, xp, xsave);
2178 c_read_gotword:
2179	Xput(xs, xp, '\0');
2180	if (intoarray) {
2181		vq = arraysearch(vp, c++);
2182	} else {
2183		vq = global(*wp);
2184		/* must be checked before exporting */
2185		if (vq->flag & RDONLY)
2186			goto c_read_splitro;
2187		if (Flag(FEXPORT))
2188			typeset(*wp, EXPORT, 0, 0, 0);
2189	}
2190	if (!setstr(vq, Xstring(xs, xp), KSH_RETURN_ERROR))
2191		goto c_read_spliterr;
2192	if (aschars) {
2193		setint_v(vq, vq, false);
2194		/* protect from UTFMODE changes */
2195		vq->type = 0;
2196	}
2197	if (intoarray || *++wp != NULL)
2198		goto c_read_splitloop;
2199
2200 c_read_splitdone:
2201	/* free up */
2202	afree(cp, ATEMP);
2203
2204 c_read_out:
2205	afree(allocd, ATEMP);
2206	Xfree(xs, xp);
2207	if (restore_tios)
2208		mksh_tcset(fd, &tios);
2209	return (rv);
2210#undef is_ifsws
2211}
2212
2213int
2214c_eval(const char **wp)
2215{
2216	struct source *s, *saves = source;
2217	unsigned char savef;
2218	int rv;
2219
2220	if (ksh_getopt(wp, &builtin_opt, null) == '?')
2221		return (1);
2222	s = pushs(SWORDS, ATEMP);
2223	s->u.strv = wp + builtin_opt.optind;
2224
2225	/*-
2226	 * The following code handles the case where the command is
2227	 * empty due to failed command substitution, for example by
2228	 *	eval "$(false)"
2229	 * This has historically returned 1 by AT&T ksh88. In this
2230	 * case, shell() will not set or change exstat because the
2231	 * compiled tree is empty, so it will use the value we pass
2232	 * from subst_exstat, which is cleared in execute(), so it
2233	 * should have been 0 if there were no substitutions.
2234	 *
2235	 * POSIX however says we don't do this, even though it is
2236	 * traditionally done. AT&T ksh93 agrees with POSIX, so we
2237	 * do. The following is an excerpt from SUSv4 [1003.2-2008]:
2238	 *
2239	 * 2.9.1: Simple Commands
2240	 *	... If there is a command name, execution shall
2241	 *	continue as described in 2.9.1.1 [Command Search
2242	 *	and Execution]. If there is no command name, but
2243	 *	the command contained a command substitution, the
2244	 *	command shall complete with the exit status of the
2245	 *	last command substitution performed.
2246	 * 2.9.1.1: Command Search and Execution
2247	 *	(1) a. If the command name matches the name of a
2248	 *	special built-in utility, that special built-in
2249	 *	utility shall be invoked.
2250	 * 2.14.5: eval
2251	 *	If there are no arguments, or only null arguments,
2252	 *	eval shall return a zero exit status; ...
2253	 */
2254	/* AT&T ksh88: use subst_exstat */
2255	/* exstat = subst_exstat; */
2256	/* SUSv4: OR with a high value never written otherwise */
2257	exstat |= 0x4000;
2258
2259	savef = Flag(FERREXIT);
2260	Flag(FERREXIT) |= 0x80;
2261	rv = shell(s, false);
2262	Flag(FERREXIT) = savef;
2263	source = saves;
2264	afree(s, ATEMP);
2265	if (exstat & 0x4000)
2266		/* detect old exstat, use 0 in that case */
2267		rv = 0;
2268	return (rv);
2269}
2270
2271int
2272c_trap(const char **wp)
2273{
2274	int i;
2275	const char *s;
2276	Trap *p;
2277
2278	if (ksh_getopt(wp, &builtin_opt, null) == '?')
2279		return (1);
2280	wp += builtin_opt.optind;
2281
2282	if (*wp == NULL) {
2283		for (p = sigtraps, i = NSIG + 1; --i >= 0; p++)
2284			if (p->trap != NULL) {
2285				shf_puts("trap -- ", shl_stdout);
2286				print_value_quoted(shl_stdout, p->trap);
2287				shprintf(" %s\n", p->name);
2288			}
2289		return (0);
2290	}
2291
2292	/*
2293	 * Use case sensitive lookup for first arg so the
2294	 * command 'exit' isn't confused with the pseudo-signal
2295	 * 'EXIT'.
2296	 */
2297	/* get command */
2298	s = (gettrap(*wp, false) == NULL) ? *wp++ : NULL;
2299	if (s != NULL && s[0] == '-' && s[1] == '\0')
2300		s = NULL;
2301
2302	/* set/clear traps */
2303	i = 0;
2304	while (*wp != NULL)
2305		if ((p = gettrap(*wp++, true)) == NULL) {
2306			warningf(true, "%s: %s '%s'", builtin_argv0,
2307			    "bad signal", wp[-1]);
2308			++i;
2309		} else
2310			settrap(p, s);
2311	return (i);
2312}
2313
2314int
2315c_exitreturn(const char **wp)
2316{
2317	int n, how = LEXIT;
2318	const char *arg;
2319
2320	if (ksh_getopt(wp, &builtin_opt, null) == '?')
2321		goto c_exitreturn_err;
2322	arg = wp[builtin_opt.optind];
2323
2324	if (arg) {
2325		if (!getn(arg, &n)) {
2326			exstat = 1;
2327			warningf(true, "%s: %s", arg, "bad number");
2328		} else
2329			exstat = n & 0xFF;
2330	} else if (trap_exstat != -1)
2331		exstat = trap_exstat;
2332	if (wp[0][0] == 'r') {
2333		/* return */
2334		struct env *ep;
2335
2336		/*
2337		 * need to tell if this is exit or return so trap exit will
2338		 * work right (POSIX)
2339		 */
2340		for (ep = e; ep; ep = ep->oenv)
2341			if (STOP_RETURN(ep->type)) {
2342				how = LRETURN;
2343				break;
2344			}
2345	}
2346
2347	if (how == LEXIT && !really_exit && j_stopped_running()) {
2348		really_exit = true;
2349		how = LSHELL;
2350	}
2351
2352	/* get rid of any i/o redirections */
2353	quitenv(NULL);
2354	unwind(how);
2355	/* NOTREACHED */
2356
2357 c_exitreturn_err:
2358	return (1);
2359}
2360
2361int
2362c_brkcont(const char **wp)
2363{
2364	unsigned int quit;
2365	int n;
2366	struct env *ep, *last_ep = NULL;
2367	const char *arg;
2368
2369	if (ksh_getopt(wp, &builtin_opt, null) == '?')
2370		goto c_brkcont_err;
2371	arg = wp[builtin_opt.optind];
2372
2373	if (!arg)
2374		n = 1;
2375	else if (!bi_getn(arg, &n))
2376		goto c_brkcont_err;
2377	if (n <= 0) {
2378		/* AT&T ksh does this for non-interactive shells only - weird */
2379		bi_errorf("%s: %s", arg, "bad value");
2380		goto c_brkcont_err;
2381	}
2382	quit = (unsigned int)n;
2383
2384	/* Stop at E_NONE, E_PARSE, E_FUNC, or E_INCL */
2385	for (ep = e; ep && !STOP_BRKCONT(ep->type); ep = ep->oenv)
2386		if (ep->type == E_LOOP) {
2387			if (--quit == 0)
2388				break;
2389			ep->flags |= EF_BRKCONT_PASS;
2390			last_ep = ep;
2391		}
2392
2393	if (quit) {
2394		/*
2395		 * AT&T ksh doesn't print a message - just does what it
2396		 * can. We print a message 'cause it helps in debugging
2397		 * scripts, but don't generate an error (ie, keep going).
2398		 */
2399		if ((unsigned int)n == quit) {
2400			warningf(true, "%s: %s %s", wp[0], "can't", wp[0]);
2401			return (0);
2402		}
2403		/*
2404		 * POSIX says if n is too big, the last enclosing loop
2405		 * shall be used. Doesn't say to print an error but we
2406		 * do anyway 'cause the user messed up.
2407		 */
2408		if (last_ep)
2409			last_ep->flags &= ~EF_BRKCONT_PASS;
2410		warningf(true, "%s: can only %s %u level(s)",
2411		    wp[0], wp[0], (unsigned int)n - quit);
2412	}
2413
2414	unwind(*wp[0] == 'b' ? LBREAK : LCONTIN);
2415	/* NOTREACHED */
2416
2417 c_brkcont_err:
2418	return (1);
2419}
2420
2421int
2422c_set(const char **wp)
2423{
2424	int argi;
2425	bool setargs;
2426	struct block *l = e->loc;
2427	const char **owp;
2428
2429	if (wp[1] == NULL) {
2430		static const char *args[] = { Tset, "-", NULL };
2431		return (c_typeset(args));
2432	}
2433
2434	if ((argi = parse_args(wp, OF_SET, &setargs)) < 0)
2435		return (2);
2436	/* set $# and $* */
2437	if (setargs) {
2438		wp += argi - 1;
2439		owp = wp;
2440		/* save $0 */
2441		wp[0] = l->argv[0];
2442		while (*++wp != NULL)
2443			strdupx(*wp, *wp, &l->area);
2444		l->argc = wp - owp - 1;
2445		l->argv = alloc2(l->argc + 2, sizeof(char *), &l->area);
2446		for (wp = l->argv; (*wp++ = *owp++) != NULL; )
2447			;
2448	}
2449	/*-
2450	 * POSIX says set exit status is 0, but old scripts that use
2451	 * getopt(1) use the construct
2452	 *	set -- $(getopt ab:c "$@")
2453	 * which assumes the exit value set will be that of the $()
2454	 * (subst_exstat is cleared in execute() so that it will be 0
2455	 * if there are no command substitutions).
2456	 */
2457#ifdef MKSH_LEGACY_MODE
2458	/* traditional behaviour, unless set -o posix */
2459	return (Flag(FPOSIX) ? 0 : subst_exstat);
2460#else
2461	/* conformant behaviour, unless set -o sh +o posix */
2462	return (Flag(FSH) && !Flag(FPOSIX) ? subst_exstat : 0);
2463#endif
2464}
2465
2466int
2467c_unset(const char **wp)
2468{
2469	const char *id;
2470	int optc, rv = 0;
2471	bool unset_var = true;
2472
2473	while ((optc = ksh_getopt(wp, &builtin_opt, "fv")) != -1)
2474		switch (optc) {
2475		case 'f':
2476			unset_var = false;
2477			break;
2478		case 'v':
2479			unset_var = true;
2480			break;
2481		case '?':
2482			/*XXX not reached due to GF_ERROR */
2483			return (2);
2484		}
2485	wp += builtin_opt.optind;
2486	for (; (id = *wp) != NULL; wp++)
2487		if (unset_var) {
2488			/* unset variable */
2489			struct tbl *vp;
2490			char *cp = NULL;
2491			size_t n;
2492
2493			n = strlen(id);
2494			if (n > 3 && id[n-3] == '[' && id[n-2] == '*' &&
2495			    id[n-1] == ']') {
2496				strndupx(cp, id, n - 3, ATEMP);
2497				id = cp;
2498				optc = 3;
2499			} else
2500				optc = vstrchr(id, '[') ? 0 : 1;
2501
2502			vp = global(id);
2503			afree(cp, ATEMP);
2504
2505			if ((vp->flag&RDONLY)) {
2506				warningf(true, "read-only: %s", vp->name);
2507				rv = 1;
2508			} else
2509				unset(vp, optc);
2510		} else
2511			/* unset function */
2512			define(id, NULL);
2513	return (rv);
2514}
2515
2516static void
2517p_time(struct shf *shf, bool posix, long tv_sec, int tv_usec, int width,
2518    const char *prefix, const char *suffix)
2519{
2520	tv_usec /= 10000;
2521	if (posix)
2522		shf_fprintf(shf, "%s%*ld.%02d%s", prefix, width,
2523		    tv_sec, tv_usec, suffix);
2524	else
2525		shf_fprintf(shf, "%s%*ldm%d.%02ds%s", prefix, width,
2526		    tv_sec / 60, (int)(tv_sec % 60), tv_usec, suffix);
2527}
2528
2529int
2530c_times(const char **wp MKSH_A_UNUSED)
2531{
2532	struct rusage usage;
2533
2534	getrusage(RUSAGE_SELF, &usage);
2535	p_time(shl_stdout, false, usage.ru_utime.tv_sec,
2536	    usage.ru_utime.tv_usec, 0, null, " ");
2537	p_time(shl_stdout, false, usage.ru_stime.tv_sec,
2538	    usage.ru_stime.tv_usec, 0, null, "\n");
2539
2540	getrusage(RUSAGE_CHILDREN, &usage);
2541	p_time(shl_stdout, false, usage.ru_utime.tv_sec,
2542	    usage.ru_utime.tv_usec, 0, null, " ");
2543	p_time(shl_stdout, false, usage.ru_stime.tv_sec,
2544	    usage.ru_stime.tv_usec, 0, null, "\n");
2545
2546	return (0);
2547}
2548
2549/*
2550 * time pipeline (really a statement, not a built-in command)
2551 */
2552int
2553timex(struct op *t, int f, volatile int *xerrok)
2554{
2555#define TF_NOARGS	BIT(0)
2556#define TF_NOREAL	BIT(1)		/* don't report real time */
2557#define TF_POSIX	BIT(2)		/* report in POSIX format */
2558	int rv = 0, tf = 0;
2559	struct rusage ru0, ru1, cru0, cru1;
2560	struct timeval usrtime, systime, tv0, tv1;
2561
2562	mksh_TIME(tv0);
2563	getrusage(RUSAGE_SELF, &ru0);
2564	getrusage(RUSAGE_CHILDREN, &cru0);
2565	if (t->left) {
2566		/*
2567		 * Two ways of getting cpu usage of a command: just use t0
2568		 * and t1 (which will get cpu usage from other jobs that
2569		 * finish while we are executing t->left), or get the
2570		 * cpu usage of t->left. AT&T ksh does the former, while
2571		 * pdksh tries to do the later (the j_usrtime hack doesn't
2572		 * really work as it only counts the last job).
2573		 */
2574		timerclear(&j_usrtime);
2575		timerclear(&j_systime);
2576		rv = execute(t->left, f | XTIME, xerrok);
2577		if (t->left->type == TCOM)
2578			tf |= t->left->str[0];
2579		mksh_TIME(tv1);
2580		getrusage(RUSAGE_SELF, &ru1);
2581		getrusage(RUSAGE_CHILDREN, &cru1);
2582	} else
2583		tf = TF_NOARGS;
2584
2585	if (tf & TF_NOARGS) {
2586		/* ksh93 - report shell times (shell+kids) */
2587		tf |= TF_NOREAL;
2588		timeradd(&ru0.ru_utime, &cru0.ru_utime, &usrtime);
2589		timeradd(&ru0.ru_stime, &cru0.ru_stime, &systime);
2590	} else {
2591		timersub(&ru1.ru_utime, &ru0.ru_utime, &usrtime);
2592		timeradd(&usrtime, &j_usrtime, &usrtime);
2593		timersub(&ru1.ru_stime, &ru0.ru_stime, &systime);
2594		timeradd(&systime, &j_systime, &systime);
2595	}
2596
2597	if (!(tf & TF_NOREAL)) {
2598		timersub(&tv1, &tv0, &tv1);
2599		if (tf & TF_POSIX)
2600			p_time(shl_out, true, tv1.tv_sec, tv1.tv_usec,
2601			    5, "real ", "\n");
2602		else
2603			p_time(shl_out, false, tv1.tv_sec, tv1.tv_usec,
2604			    5, null, " real ");
2605	}
2606	if (tf & TF_POSIX)
2607		p_time(shl_out, true, usrtime.tv_sec, usrtime.tv_usec,
2608		    5, "user ", "\n");
2609	else
2610		p_time(shl_out, false, usrtime.tv_sec, usrtime.tv_usec,
2611		    5, null, " user ");
2612	if (tf & TF_POSIX)
2613		p_time(shl_out, true, systime.tv_sec, systime.tv_usec,
2614		    5, "sys  ", "\n");
2615	else
2616		p_time(shl_out, false, systime.tv_sec, systime.tv_usec,
2617		    5, null, " system\n");
2618	shf_flush(shl_out);
2619
2620	return (rv);
2621}
2622
2623void
2624timex_hook(struct op *t, char **volatile *app)
2625{
2626	char **wp = *app;
2627	int optc, i, j;
2628	Getopt opt;
2629
2630	ksh_getopt_reset(&opt, 0);
2631	/* start at the start */
2632	opt.optind = 0;
2633	while ((optc = ksh_getopt((const char **)wp, &opt, ":p")) != -1)
2634		switch (optc) {
2635		case 'p':
2636			t->str[0] |= TF_POSIX;
2637			break;
2638		case '?':
2639			errorf("time: -%s %s", opt.optarg,
2640			    "unknown option");
2641		case ':':
2642			errorf("time: -%s %s", opt.optarg,
2643			    "requires an argument");
2644		}
2645	/* Copy command words down over options. */
2646	if (opt.optind != 0) {
2647		for (i = 0; i < opt.optind; i++)
2648			afree(wp[i], ATEMP);
2649		for (i = 0, j = opt.optind; (wp[i] = wp[j]); i++, j++)
2650			;
2651	}
2652	if (!wp[0])
2653		t->str[0] |= TF_NOARGS;
2654	*app = wp;
2655}
2656
2657/* exec with no args - args case is taken care of in comexec() */
2658int
2659c_exec(const char **wp MKSH_A_UNUSED)
2660{
2661	int i;
2662
2663	/* make sure redirects stay in place */
2664	if (e->savefd != NULL) {
2665		for (i = 0; i < NUFILE; i++) {
2666			if (e->savefd[i] > 0)
2667				close(e->savefd[i]);
2668#ifndef MKSH_LEGACY_MODE
2669			/*
2670			 * keep all file descriptors > 2 private for ksh,
2671			 * but not for POSIX or legacy/kludge sh
2672			 */
2673			if (!Flag(FPOSIX) && !Flag(FSH) && i > 2 &&
2674			    e->savefd[i])
2675				fcntl(i, F_SETFD, FD_CLOEXEC);
2676#endif
2677		}
2678		e->savefd = NULL;
2679	}
2680	return (0);
2681}
2682
2683#if HAVE_MKNOD
2684int
2685c_mknod(const char **wp)
2686{
2687	int argc, optc, rv = 0;
2688	bool ismkfifo = false;
2689	const char **argv;
2690	void *set = NULL;
2691	mode_t mode = 0, oldmode = 0;
2692
2693	while ((optc = ksh_getopt(wp, &builtin_opt, "m:")) != -1) {
2694		switch (optc) {
2695		case 'm':
2696			set = setmode(builtin_opt.optarg);
2697			if (set == NULL) {
2698				bi_errorf("invalid file mode");
2699				return (1);
2700			}
2701			mode = getmode(set, (mode_t)(DEFFILEMODE));
2702			free_ossetmode(set);
2703			break;
2704		default:
2705			goto c_mknod_usage;
2706		}
2707	}
2708	argv = &wp[builtin_opt.optind];
2709	if (argv[0] == NULL)
2710		goto c_mknod_usage;
2711	for (argc = 0; argv[argc]; argc++)
2712		;
2713	if (argc == 2 && argv[1][0] == 'p')
2714		ismkfifo = true;
2715	else if (argc != 4 || (argv[1][0] != 'b' && argv[1][0] != 'c'))
2716		goto c_mknod_usage;
2717
2718	if (set != NULL)
2719		oldmode = umask((mode_t)0);
2720	else
2721		mode = DEFFILEMODE;
2722
2723	mode |= (argv[1][0] == 'b') ? S_IFBLK :
2724	    (argv[1][0] == 'c') ? S_IFCHR : 0;
2725
2726	if (!ismkfifo) {
2727		unsigned long majnum, minnum;
2728		dev_t dv;
2729		char *c;
2730
2731		majnum = strtoul(argv[2], &c, 0);
2732		if ((c == argv[2]) || (*c != '\0')) {
2733			bi_errorf("non-numeric %s %s '%s'", "device", "major", argv[2]);
2734			goto c_mknod_err;
2735		}
2736		minnum = strtoul(argv[3], &c, 0);
2737		if ((c == argv[3]) || (*c != '\0')) {
2738			bi_errorf("non-numeric %s %s '%s'", "device", "minor", argv[3]);
2739			goto c_mknod_err;
2740		}
2741		dv = makedev(majnum, minnum);
2742		if ((unsigned long)(major(dv)) != majnum) {
2743			bi_errorf("%s %s too large: %lu", "device", "major", majnum);
2744			goto c_mknod_err;
2745		}
2746		if ((unsigned long)(minor(dv)) != minnum) {
2747			bi_errorf("%s %s too large: %lu", "device", "minor", minnum);
2748			goto c_mknod_err;
2749		}
2750		if (mknod(argv[0], mode, dv))
2751			goto c_mknod_failed;
2752	} else if (mkfifo(argv[0], mode)) {
2753 c_mknod_failed:
2754		bi_errorf("%s: %s", argv[0], cstrerror(errno));
2755 c_mknod_err:
2756		rv = 1;
2757	}
2758
2759	if (set)
2760		umask(oldmode);
2761	return (rv);
2762 c_mknod_usage:
2763	bi_errorf("%s: %s", "usage", "mknod [-m mode] name b|c major minor");
2764	bi_errorf("%s: %s", "usage", "mknod [-m mode] name p");
2765	return (1);
2766}
2767#endif
2768
2769/*-
2770   test(1) roughly accepts the following grammar:
2771	oexpr	::= aexpr | aexpr "-o" oexpr ;
2772	aexpr	::= nexpr | nexpr "-a" aexpr ;
2773	nexpr	::= primary | "!" nexpr ;
2774	primary	::= unary-operator operand
2775		| operand binary-operator operand
2776		| operand
2777		| "(" oexpr ")"
2778		;
2779
2780	unary-operator ::= "-a"|"-r"|"-w"|"-x"|"-e"|"-f"|"-d"|"-c"|"-b"|"-p"|
2781			   "-u"|"-g"|"-k"|"-s"|"-t"|"-z"|"-n"|"-o"|"-O"|"-G"|
2782			   "-L"|"-h"|"-S"|"-H";
2783
2784	binary-operator ::= "="|"=="|"!="|"-eq"|"-ne"|"-ge"|"-gt"|"-le"|"-lt"|
2785			    "-nt"|"-ot"|"-ef"|
2786			    "<"|">"	# rules used for [[ ... ]] expressions
2787			    ;
2788	operand ::= <anything>
2789*/
2790
2791/* POSIX says > 1 for errors */
2792#define T_ERR_EXIT 2
2793
2794int
2795c_test(const char **wp)
2796{
2797	int argc, rv, invert = 0;
2798	Test_env te;
2799	Test_op op;
2800	const char *lhs, **swp;
2801
2802	te.flags = 0;
2803	te.isa = ptest_isa;
2804	te.getopnd = ptest_getopnd;
2805	te.eval = test_eval;
2806	te.error = ptest_error;
2807
2808	for (argc = 0; wp[argc]; argc++)
2809		;
2810
2811	if (strcmp(wp[0], "[") == 0) {
2812		if (strcmp(wp[--argc], "]") != 0) {
2813			bi_errorf("missing ]");
2814			return (T_ERR_EXIT);
2815		}
2816	}
2817
2818	te.pos.wp = wp + 1;
2819	te.wp_end = wp + argc;
2820
2821	/*
2822	 * Attempt to conform to POSIX special cases. This is pretty
2823	 * dumb code straight-forward from the 2008 spec, but unless
2824	 * the old pdksh code doesn't live from so many assumptions.
2825	 * It does, though, inline some calls to '(*te.funcname)()'.
2826	 */
2827	switch (argc - 1) {
2828	case 0:
2829		return (1);
2830	case 1:
2831 ptest_one:
2832		op = TO_STNZE;
2833		goto ptest_unary;
2834	case 2:
2835 ptest_two:
2836		if (ptest_isa(&te, TM_NOT)) {
2837			++invert;
2838			goto ptest_one;
2839		}
2840		if ((op = ptest_isa(&te, TM_UNOP))) {
2841 ptest_unary:
2842			rv = test_eval(&te, op, *te.pos.wp++, NULL, true);
2843 ptest_out:
2844			return ((invert & 1) ? rv : !rv);
2845		}
2846		/* let the parser deal with anything else */
2847		break;
2848	case 3:
2849 ptest_three:
2850		swp = te.pos.wp;
2851		/* use inside knowledge of ptest_getopnd inlined below */
2852		lhs = *te.pos.wp++;
2853		if ((op = ptest_isa(&te, TM_BINOP))) {
2854			/* test lhs op rhs */
2855			rv = test_eval(&te, op, lhs, *te.pos.wp++, true);
2856			goto ptest_out;
2857		}
2858		/* back up to lhs */
2859		te.pos.wp = swp;
2860		if (ptest_isa(&te, TM_NOT)) {
2861			++invert;
2862			goto ptest_two;
2863		}
2864		if (ptest_isa(&te, TM_OPAREN)) {
2865			swp = te.pos.wp;
2866			/* skip operand, without evaluation */
2867			te.pos.wp++;
2868			/* check for closing parenthesis */
2869			op = ptest_isa(&te, TM_CPAREN);
2870			/* back up to operand */
2871			te.pos.wp = swp;
2872			/* if there was a closing paren, handle it */
2873			if (op)
2874				goto ptest_one;
2875			/* backing up is done before calling the parser */
2876		}
2877		/* let the parser deal with it */
2878		break;
2879	case 4:
2880		if (ptest_isa(&te, TM_NOT)) {
2881			++invert;
2882			goto ptest_three;
2883		}
2884		if (ptest_isa(&te, TM_OPAREN)) {
2885			swp = te.pos.wp;
2886			/* skip two operands, without evaluation */
2887			te.pos.wp++;
2888			te.pos.wp++;
2889			/* check for closing parenthesis */
2890			op = ptest_isa(&te, TM_CPAREN);
2891			/* back up to first operand */
2892			te.pos.wp = swp;
2893			/* if there was a closing paren, handle it */
2894			if (op)
2895				goto ptest_two;
2896			/* backing up is done before calling the parser */
2897		}
2898		/* defer this to the parser */
2899		break;
2900	}
2901
2902	/* "The results are unspecified." */
2903	te.pos.wp = wp + 1;
2904	return (test_parse(&te));
2905}
2906
2907/*
2908 * Generic test routines.
2909 */
2910
2911Test_op
2912test_isop(Test_meta meta, const char *s)
2913{
2914	char sc1;
2915	const struct t_op *tbl;
2916
2917	tbl = meta == TM_UNOP ? u_ops : b_ops;
2918	if (*s) {
2919		sc1 = s[1];
2920		for (; tbl->op_text[0]; tbl++)
2921			if (sc1 == tbl->op_text[1] && !strcmp(s, tbl->op_text))
2922				return (tbl->op_num);
2923	}
2924	return (TO_NONOP);
2925}
2926
2927int
2928test_eval(Test_env *te, Test_op op, const char *opnd1, const char *opnd2,
2929    bool do_eval)
2930{
2931	int i, s;
2932	size_t k;
2933	struct stat b1, b2;
2934	mksh_ari_t v1, v2;
2935
2936	if (!do_eval)
2937		return (0);
2938
2939#ifdef DEBUG
2940	switch (op) {
2941	/* Binary operators */
2942	case TO_STEQL:
2943	case TO_STNEQ:
2944	case TO_STLT:
2945	case TO_STGT:
2946	case TO_INTEQ:
2947	case TO_INTNE:
2948	case TO_INTGT:
2949	case TO_INTGE:
2950	case TO_INTLT:
2951	case TO_INTLE:
2952	case TO_FILEQ:
2953	case TO_FILNT:
2954	case TO_FILOT:
2955		/* consistency check, but does not happen in practice */
2956		if (!opnd2) {
2957			te->flags |= TEF_ERROR;
2958			return (1);
2959		}
2960		break;
2961	default:
2962		/* for completeness of switch */
2963		break;
2964	}
2965#endif
2966
2967	switch (op) {
2968
2969	/*
2970	 * Unary Operators
2971	 */
2972
2973	/* -n */
2974	case TO_STNZE:
2975		return (*opnd1 != '\0');
2976
2977	/* -z */
2978	case TO_STZER:
2979		return (*opnd1 == '\0');
2980
2981	/* -o */
2982	case TO_OPTION:
2983		if ((i = *opnd1) == '!' || i == '?')
2984			opnd1++;
2985		if ((k = option(opnd1)) == (size_t)-1)
2986			return (0);
2987		return (i == '?' ? 1 : i == '!' ? !Flag(k) : Flag(k));
2988
2989	/* -r */
2990	case TO_FILRD:
2991		/* LINTED use of access */
2992		return (access(opnd1, R_OK) == 0);
2993
2994	/* -w */
2995	case TO_FILWR:
2996		/* LINTED use of access */
2997		return (access(opnd1, W_OK) == 0);
2998
2999	/* -x */
3000	case TO_FILEX:
3001		return (ksh_access(opnd1, X_OK) == 0);
3002
3003	/* -a */
3004	case TO_FILAXST:
3005	/* -e */
3006	case TO_FILEXST:
3007		return (stat(opnd1, &b1) == 0);
3008
3009	/* -r */
3010	case TO_FILREG:
3011		return (stat(opnd1, &b1) == 0 && S_ISREG(b1.st_mode));
3012
3013	/* -d */
3014	case TO_FILID:
3015		return (stat(opnd1, &b1) == 0 && S_ISDIR(b1.st_mode));
3016
3017	/* -c */
3018	case TO_FILCDEV:
3019		return (stat(opnd1, &b1) == 0 && S_ISCHR(b1.st_mode));
3020
3021	/* -b */
3022	case TO_FILBDEV:
3023		return (stat(opnd1, &b1) == 0 && S_ISBLK(b1.st_mode));
3024
3025	/* -p */
3026	case TO_FILFIFO:
3027		return (stat(opnd1, &b1) == 0 && S_ISFIFO(b1.st_mode));
3028
3029	/* -h or -L */
3030	case TO_FILSYM:
3031#ifdef MKSH__NO_SYMLINK
3032		return (0);
3033#else
3034		return (lstat(opnd1, &b1) == 0 && S_ISLNK(b1.st_mode));
3035#endif
3036
3037	/* -S */
3038	case TO_FILSOCK:
3039		return (stat(opnd1, &b1) == 0 && S_ISSOCK(b1.st_mode));
3040
3041	/* -H => HP context dependent files (directories) */
3042	case TO_FILCDF:
3043#ifdef S_ISCDF
3044	{
3045		char *nv;
3046
3047		/*
3048		 * Append a + to filename and check to see if result is
3049		 * a setuid directory. CDF stuff in general is hookey,
3050		 * since it breaks for, e.g., the following sequence:
3051		 * echo hi >foo+; mkdir foo; echo bye >foo/default;
3052		 * chmod u+s foo (foo+ refers to the file with hi in it,
3053		 * there is no way to get at the file with bye in it;
3054		 * please correct me if I'm wrong about this).
3055		 */
3056
3057		nv = shf_smprintf("%s+", opnd1);
3058		i = (stat(nv, &b1) == 0 && S_ISCDF(b1.st_mode));
3059		afree(nv, ATEMP);
3060		return (i);
3061	}
3062#else
3063		return (0);
3064#endif
3065
3066	/* -u */
3067	case TO_FILSETU:
3068		return (stat(opnd1, &b1) == 0 &&
3069		    (b1.st_mode & S_ISUID) == S_ISUID);
3070
3071	/* -g */
3072	case TO_FILSETG:
3073		return (stat(opnd1, &b1) == 0 &&
3074		    (b1.st_mode & S_ISGID) == S_ISGID);
3075
3076	/* -k */
3077	case TO_FILSTCK:
3078#ifdef S_ISVTX
3079		return (stat(opnd1, &b1) == 0 &&
3080		    (b1.st_mode & S_ISVTX) == S_ISVTX);
3081#else
3082		return (0);
3083#endif
3084
3085	/* -s */
3086	case TO_FILGZ:
3087		return (stat(opnd1, &b1) == 0 && (off_t)b1.st_size > (off_t)0);
3088
3089	/* -t */
3090	case TO_FILTT:
3091		if (opnd1 && !bi_getn(opnd1, &i)) {
3092			te->flags |= TEF_ERROR;
3093			i = 0;
3094		} else
3095			i = isatty(opnd1 ? i : 0);
3096		return (i);
3097
3098	/* -O */
3099	case TO_FILUID:
3100		return (stat(opnd1, &b1) == 0 && (uid_t)b1.st_uid == ksheuid);
3101
3102	/* -G */
3103	case TO_FILGID:
3104		return (stat(opnd1, &b1) == 0 && (gid_t)b1.st_gid == getegid());
3105
3106	/*
3107	 * Binary Operators
3108	 */
3109
3110	/* = */
3111	case TO_STEQL:
3112		if (te->flags & TEF_DBRACKET)
3113			return (gmatchx(opnd1, opnd2, false));
3114		return (strcmp(opnd1, opnd2) == 0);
3115
3116	/* != */
3117	case TO_STNEQ:
3118		if (te->flags & TEF_DBRACKET)
3119			return (!gmatchx(opnd1, opnd2, false));
3120		return (strcmp(opnd1, opnd2) != 0);
3121
3122	/* < */
3123	case TO_STLT:
3124		return (strcmp(opnd1, opnd2) < 0);
3125
3126	/* > */
3127	case TO_STGT:
3128		return (strcmp(opnd1, opnd2) > 0);
3129
3130	/* -eq */
3131	case TO_INTEQ:
3132	/* -ne */
3133	case TO_INTNE:
3134	/* -ge */
3135	case TO_INTGE:
3136	/* -gt */
3137	case TO_INTGT:
3138	/* -le */
3139	case TO_INTLE:
3140	/* -lt */
3141	case TO_INTLT:
3142		if (!evaluate(opnd1, &v1, KSH_RETURN_ERROR, false) ||
3143		    !evaluate(opnd2, &v2, KSH_RETURN_ERROR, false)) {
3144			/* error already printed.. */
3145			te->flags |= TEF_ERROR;
3146			return (1);
3147		}
3148		switch (op) {
3149		case TO_INTEQ:
3150			return (v1 == v2);
3151		case TO_INTNE:
3152			return (v1 != v2);
3153		case TO_INTGE:
3154			return (v1 >= v2);
3155		case TO_INTGT:
3156			return (v1 > v2);
3157		case TO_INTLE:
3158			return (v1 <= v2);
3159		case TO_INTLT:
3160			return (v1 < v2);
3161		default:
3162			/* NOTREACHED */
3163			break;
3164		}
3165		/* NOTREACHED */
3166
3167	/* -nt */
3168	case TO_FILNT:
3169		/*
3170		 * ksh88/ksh93 succeed if file2 can't be stated
3171		 * (subtly different from 'does not exist').
3172		 */
3173		return (stat(opnd1, &b1) == 0 &&
3174		    (((s = stat(opnd2, &b2)) == 0 &&
3175		    b1.st_mtime > b2.st_mtime) || s < 0));
3176
3177	/* -ot */
3178	case TO_FILOT:
3179		/*
3180		 * ksh88/ksh93 succeed if file1 can't be stated
3181		 * (subtly different from 'does not exist').
3182		 */
3183		return (stat(opnd2, &b2) == 0 &&
3184		    (((s = stat(opnd1, &b1)) == 0 &&
3185		    b1.st_mtime < b2.st_mtime) || s < 0));
3186
3187	/* -ef */
3188	case TO_FILEQ:
3189		return (stat (opnd1, &b1) == 0 && stat (opnd2, &b2) == 0 &&
3190		    b1.st_dev == b2.st_dev && b1.st_ino == b2.st_ino);
3191
3192	/* all other cases */
3193	case TO_NONOP:
3194	case TO_NONNULL:
3195		/* throw the error */
3196		break;
3197	}
3198	(*te->error)(te, 0, "internal error: unknown op");
3199	return (1);
3200}
3201
3202int
3203test_parse(Test_env *te)
3204{
3205	int rv;
3206
3207	rv = test_oexpr(te, 1);
3208
3209	if (!(te->flags & TEF_ERROR) && !(*te->isa)(te, TM_END))
3210		(*te->error)(te, 0, "unexpected operator/operand");
3211
3212	return ((te->flags & TEF_ERROR) ? T_ERR_EXIT : !rv);
3213}
3214
3215static int
3216test_oexpr(Test_env *te, bool do_eval)
3217{
3218	int rv;
3219
3220	if ((rv = test_aexpr(te, do_eval)))
3221		do_eval = false;
3222	if (!(te->flags & TEF_ERROR) && (*te->isa)(te, TM_OR))
3223		return (test_oexpr(te, do_eval) || rv);
3224	return (rv);
3225}
3226
3227static int
3228test_aexpr(Test_env *te, bool do_eval)
3229{
3230	int rv;
3231
3232	if (!(rv = test_nexpr(te, do_eval)))
3233		do_eval = false;
3234	if (!(te->flags & TEF_ERROR) && (*te->isa)(te, TM_AND))
3235		return (test_aexpr(te, do_eval) && rv);
3236	return (rv);
3237}
3238
3239static int
3240test_nexpr(Test_env *te, bool do_eval)
3241{
3242	if (!(te->flags & TEF_ERROR) && (*te->isa)(te, TM_NOT))
3243		return (!test_nexpr(te, do_eval));
3244	return (test_primary(te, do_eval));
3245}
3246
3247static int
3248test_primary(Test_env *te, bool do_eval)
3249{
3250	const char *opnd1, *opnd2;
3251	int rv;
3252	Test_op op;
3253
3254	if (te->flags & TEF_ERROR)
3255		return (0);
3256	if ((*te->isa)(te, TM_OPAREN)) {
3257		rv = test_oexpr(te, do_eval);
3258		if (te->flags & TEF_ERROR)
3259			return (0);
3260		if (!(*te->isa)(te, TM_CPAREN)) {
3261			(*te->error)(te, 0, "missing )");
3262			return (0);
3263		}
3264		return (rv);
3265	}
3266	/*
3267	 * Binary should have precedence over unary in this case
3268	 * so that something like test \( -f = -f \) is accepted
3269	 */
3270	if ((te->flags & TEF_DBRACKET) || (&te->pos.wp[1] < te->wp_end &&
3271	    !test_isop(TM_BINOP, te->pos.wp[1]))) {
3272		if ((op = (*te->isa)(te, TM_UNOP))) {
3273			/* unary expression */
3274			opnd1 = (*te->getopnd)(te, op, do_eval);
3275			if (!opnd1) {
3276				(*te->error)(te, -1, "missing argument");
3277				return (0);
3278			}
3279
3280			return ((*te->eval)(te, op, opnd1, NULL, do_eval));
3281		}
3282	}
3283	opnd1 = (*te->getopnd)(te, TO_NONOP, do_eval);
3284	if (!opnd1) {
3285		(*te->error)(te, 0, "expression expected");
3286		return (0);
3287	}
3288	if ((op = (*te->isa)(te, TM_BINOP))) {
3289		/* binary expression */
3290		opnd2 = (*te->getopnd)(te, op, do_eval);
3291		if (!opnd2) {
3292			(*te->error)(te, -1, "missing second argument");
3293			return (0);
3294		}
3295
3296		return ((*te->eval)(te, op, opnd1, opnd2, do_eval));
3297	}
3298	return ((*te->eval)(te, TO_STNZE, opnd1, NULL, do_eval));
3299}
3300
3301/*
3302 * Plain test (test and [ .. ]) specific routines.
3303 */
3304
3305/*
3306 * Test if the current token is a whatever. Accepts the current token if
3307 * it is. Returns 0 if it is not, non-zero if it is (in the case of
3308 * TM_UNOP and TM_BINOP, the returned value is a Test_op).
3309 */
3310static Test_op
3311ptest_isa(Test_env *te, Test_meta meta)
3312{
3313	/* Order important - indexed by Test_meta values */
3314	static const char * const tokens[] = {
3315		"-o", "-a", "!", "(", ")"
3316	};
3317	Test_op rv;
3318
3319	if (te->pos.wp >= te->wp_end)
3320		return (meta == TM_END ? TO_NONNULL : TO_NONOP);
3321
3322	if (meta == TM_UNOP || meta == TM_BINOP)
3323		rv = test_isop(meta, *te->pos.wp);
3324	else if (meta == TM_END)
3325		rv = TO_NONOP;
3326	else
3327		rv = !strcmp(*te->pos.wp, tokens[(int)meta]) ?
3328		    TO_NONNULL : TO_NONOP;
3329
3330	/* Accept the token? */
3331	if (rv != TO_NONOP)
3332		te->pos.wp++;
3333
3334	return (rv);
3335}
3336
3337static const char *
3338ptest_getopnd(Test_env *te, Test_op op, bool do_eval MKSH_A_UNUSED)
3339{
3340	if (te->pos.wp >= te->wp_end)
3341		return (op == TO_FILTT ? "1" : NULL);
3342	return (*te->pos.wp++);
3343}
3344
3345static void
3346ptest_error(Test_env *te, int ofs, const char *msg)
3347{
3348	const char *op;
3349
3350	te->flags |= TEF_ERROR;
3351	if ((op = te->pos.wp + ofs >= te->wp_end ? NULL : te->pos.wp[ofs]))
3352		bi_errorf("%s: %s", op, msg);
3353	else
3354		bi_errorf("%s", msg);
3355}
3356
3357#ifndef MKSH_NO_LIMITS
3358#define SOFT	0x1
3359#define HARD	0x2
3360
3361/* Magic to divine the 'm' and 'v' limits */
3362
3363#ifdef RLIMIT_AS
3364#if !defined(RLIMIT_VMEM) || (RLIMIT_VMEM == RLIMIT_AS) || \
3365    !defined(RLIMIT_RSS) || (RLIMIT_VMEM == RLIMIT_RSS)
3366#define ULIMIT_V_IS_AS
3367#elif defined(RLIMIT_VMEM)
3368#if !defined(RLIMIT_RSS) || (RLIMIT_RSS == RLIMIT_AS)
3369#define ULIMIT_V_IS_AS
3370#else
3371#define ULIMIT_V_IS_VMEM
3372#endif
3373#endif
3374#endif
3375
3376#ifdef RLIMIT_RSS
3377#ifdef ULIMIT_V_IS_VMEM
3378#define ULIMIT_M_IS_RSS
3379#elif defined(RLIMIT_VMEM) && (RLIMIT_VMEM == RLIMIT_RSS)
3380#define ULIMIT_M_IS_VMEM
3381#else
3382#define ULIMIT_M_IS_RSS
3383#endif
3384#if defined(ULIMIT_M_IS_RSS) && defined(RLIMIT_AS) && (RLIMIT_RSS == RLIMIT_AS)
3385#undef ULIMIT_M_IS_RSS
3386#endif
3387#endif
3388
3389#if !defined(RLIMIT_AS) && !defined(ULIMIT_M_IS_VMEM) && defined(RLIMIT_VMEM)
3390#define ULIMIT_V_IS_VMEM
3391#endif
3392
3393#if !defined(ULIMIT_V_IS_VMEM) && defined(RLIMIT_VMEM) && \
3394    (!defined(RLIMIT_RSS) || (defined(RLIMIT_AS) && (RLIMIT_RSS == RLIMIT_AS)))
3395#define ULIMIT_M_IS_VMEM
3396#endif
3397
3398#if defined(ULIMIT_M_IS_VMEM) && defined(RLIMIT_AS) && \
3399    (RLIMIT_VMEM == RLIMIT_AS)
3400#undef ULIMIT_M_IS_VMEM
3401#endif
3402
3403#if defined(ULIMIT_M_IS_RSS) && defined(ULIMIT_M_IS_VMEM)
3404# error nonsensical m ulimit
3405#endif
3406
3407#if defined(ULIMIT_V_IS_VMEM) && defined(ULIMIT_V_IS_AS)
3408# error nonsensical v ulimit
3409#endif
3410
3411#define RLIMITS_DEFNS
3412#include "rlimits.gen"
3413
3414static void print_ulimit(const struct limits *, int);
3415static int set_ulimit(const struct limits *, const char *, int);
3416
3417static const struct limits * const rlimits[] = {
3418#define RLIMITS_ITEMS
3419#include "rlimits.gen"
3420};
3421
3422static const char rlimits_opts[] =
3423#define RLIMITS_OPTCS
3424#include "rlimits.gen"
3425    ;
3426
3427int
3428c_ulimit(const char **wp)
3429{
3430	size_t i = 0;
3431	int how = SOFT | HARD, optc, what = 'f';
3432	bool all = false;
3433
3434	while ((optc = ksh_getopt(wp, &builtin_opt, rlimits_opts)) != -1)
3435		switch (optc) {
3436		case 'H':
3437			how = HARD;
3438			break;
3439		case 'S':
3440			how = SOFT;
3441			break;
3442		case 'a':
3443			all = true;
3444			break;
3445		case '?':
3446			bi_errorf("usage: ulimit [-%s] [value]", rlimits_opts);
3447			return (1);
3448		default:
3449			what = optc;
3450		}
3451
3452	while (i < NELEM(rlimits)) {
3453		if (rlimits[i]->optchar == what)
3454			goto found;
3455		++i;
3456	}
3457	internal_warningf("ulimit: %c", what);
3458	return (1);
3459 found:
3460	if (wp[builtin_opt.optind]) {
3461		if (all || wp[builtin_opt.optind + 1]) {
3462			bi_errorf("too many arguments");
3463			return (1);
3464		}
3465		return (set_ulimit(rlimits[i], wp[builtin_opt.optind], how));
3466	}
3467	if (!all)
3468		print_ulimit(rlimits[i], how);
3469	else for (i = 0; i < NELEM(rlimits); ++i) {
3470		shprintf("%-20s ", rlimits[i]->name);
3471		print_ulimit(rlimits[i], how);
3472	}
3473	return (0);
3474}
3475
3476static int
3477set_ulimit(const struct limits *l, const char *v, int how)
3478{
3479	rlim_t val = (rlim_t)0;
3480	struct rlimit limit;
3481
3482	if (strcmp(v, "unlimited") == 0)
3483		val = (rlim_t)RLIM_INFINITY;
3484	else {
3485		mksh_uari_t rval;
3486
3487		if (!evaluate(v, (mksh_ari_t *)&rval, KSH_RETURN_ERROR, false))
3488			return (1);
3489		/*
3490		 * Avoid problems caused by typos that evaluate misses due
3491		 * to evaluating unset parameters to 0...
3492		 * If this causes problems, will have to add parameter to
3493		 * evaluate() to control if unset params are 0 or an error.
3494		 */
3495		if (!rval && !ksh_isdigit(v[0])) {
3496			bi_errorf("invalid %s limit: %s", l->name, v);
3497			return (1);
3498		}
3499		val = (rlim_t)((rlim_t)rval * l->factor);
3500	}
3501
3502	if (getrlimit(l->resource, &limit) < 0) {
3503#ifndef MKSH_SMALL
3504		bi_errorf("limit %s could not be read, contact the mksh developers: %s",
3505		    l->name, cstrerror(errno));
3506#endif
3507		/* some can't be read */
3508		limit.rlim_cur = RLIM_INFINITY;
3509		limit.rlim_max = RLIM_INFINITY;
3510	}
3511	if (how & SOFT)
3512		limit.rlim_cur = val;
3513	if (how & HARD)
3514		limit.rlim_max = val;
3515	if (!setrlimit(l->resource, &limit))
3516		return (0);
3517	if (errno == EPERM)
3518		bi_errorf("%s exceeds allowable %s limit", v, l->name);
3519	else
3520		bi_errorf("bad %s limit: %s", l->name, cstrerror(errno));
3521	return (1);
3522}
3523
3524static void
3525print_ulimit(const struct limits *l, int how)
3526{
3527	rlim_t val = (rlim_t)0;
3528	struct rlimit limit;
3529
3530	if (getrlimit(l->resource, &limit)) {
3531		shf_puts("unknown\n", shl_stdout);
3532		return;
3533	}
3534	if (how & SOFT)
3535		val = limit.rlim_cur;
3536	else if (how & HARD)
3537		val = limit.rlim_max;
3538	if (val == (rlim_t)RLIM_INFINITY)
3539		shf_puts("unlimited\n", shl_stdout);
3540	else
3541		shprintf("%lu\n", (unsigned long)(val / l->factor));
3542}
3543#endif
3544
3545int
3546c_rename(const char **wp)
3547{
3548	int rv = 1;
3549
3550	/* skip argv[0] */
3551	++wp;
3552	if (wp[0] && !strcmp(wp[0], "--"))
3553		/* skip "--" (options separator) */
3554		++wp;
3555
3556	/* check for exactly two arguments */
3557	if (wp[0] == NULL	/* first argument */ ||
3558	    wp[1] == NULL	/* second argument */ ||
3559	    wp[2] != NULL	/* no further args please */)
3560		bi_errorf(Tsynerr);
3561	else if ((rv = rename(wp[0], wp[1])) != 0) {
3562		rv = errno;
3563		bi_errorf("%s: %s", "failed", cstrerror(rv));
3564	}
3565
3566	return (rv);
3567}
3568
3569int
3570c_realpath(const char **wp)
3571{
3572	int rv = 1;
3573	char *buf;
3574
3575	/* skip argv[0] */
3576	++wp;
3577	if (wp[0] && !strcmp(wp[0], "--"))
3578		/* skip "--" (options separator) */
3579		++wp;
3580
3581	/* check for exactly one argument */
3582	if (wp[0] == NULL || wp[1] != NULL)
3583		bi_errorf(Tsynerr);
3584	else if ((buf = do_realpath(wp[0])) == NULL) {
3585		rv = errno;
3586		bi_errorf("%s: %s", wp[0], cstrerror(rv));
3587		if ((unsigned int)rv > 255)
3588			rv = 255;
3589	} else {
3590		shprintf("%s\n", buf);
3591		afree(buf, ATEMP);
3592		rv = 0;
3593	}
3594
3595	return (rv);
3596}
3597
3598int
3599c_cat(const char **wp)
3600{
3601	int fd = STDIN_FILENO, rv, eno;
3602	ssize_t n, w;
3603	const char *fn = "<stdin>";
3604	char *buf, *cp;
3605#define MKSH_CAT_BUFSIZ 4096
3606
3607	/* parse options: POSIX demands we support "-u" as no-op */
3608	while ((rv = ksh_getopt(wp, &builtin_opt, "u")) != -1) {
3609		switch (rv) {
3610		case 'u':
3611			/* we already operate unbuffered */
3612			break;
3613		default:
3614			bi_errorf(Tsynerr);
3615			return (1);
3616		}
3617	}
3618	wp += builtin_opt.optind;
3619	rv = 0;
3620
3621	if ((buf = malloc_osfunc(MKSH_CAT_BUFSIZ)) == NULL) {
3622		bi_errorf(Toomem, (size_t)MKSH_CAT_BUFSIZ);
3623		return (1);
3624	}
3625
3626	do {
3627		if (*wp) {
3628			fn = *wp++;
3629			if (fn[0] == '-' && fn[1] == '\0')
3630				fd = STDIN_FILENO;
3631			else if ((fd = open(fn, O_RDONLY | O_BINARY)) < 0) {
3632				eno = errno;
3633				bi_errorf("%s: %s", fn, cstrerror(eno));
3634				rv = 1;
3635				continue;
3636			}
3637		}
3638		while (/* CONSTCOND */ 1) {
3639			n = blocking_read(fd, (cp = buf), MKSH_CAT_BUFSIZ);
3640			eno = errno;
3641			/* give the user a chance to ^C out */
3642			intrcheck();
3643			if (n == -1) {
3644				if (eno == EINTR) {
3645					/* interrupted, try again */
3646					continue;
3647				}
3648				/* an error occured during reading */
3649				bi_errorf("%s: %s", fn, cstrerror(eno));
3650				rv = 1;
3651				break;
3652			} else if (n == 0)
3653				/* end of file reached */
3654				break;
3655			while (n) {
3656				w = write(STDOUT_FILENO, cp, n);
3657				eno = errno;
3658				/* give the user a chance to ^C out */
3659				intrcheck();
3660				if (w == -1) {
3661					if (eno == EINTR)
3662						/* interrupted, try again */
3663						continue;
3664					/* an error occured during writing */
3665					bi_errorf("%s: %s", "<stdout>",
3666					    cstrerror(eno));
3667					rv = 1;
3668					if (fd != STDIN_FILENO)
3669						close(fd);
3670					goto out;
3671				}
3672				n -= w;
3673				cp += w;
3674			}
3675		}
3676		if (fd != STDIN_FILENO)
3677			close(fd);
3678	} while (*wp);
3679
3680 out:
3681	free_osfunc(buf);
3682	return (rv);
3683}
3684
3685#if HAVE_SELECT
3686int
3687c_sleep(const char **wp)
3688{
3689	struct timeval tv;
3690	int rv = 1;
3691
3692	/* skip argv[0] */
3693	++wp;
3694	if (wp[0] && !strcmp(wp[0], "--"))
3695		/* skip "--" (options separator) */
3696		++wp;
3697
3698	if (!wp[0] || wp[1])
3699		bi_errorf(Tsynerr);
3700	else if (parse_usec(wp[0], &tv))
3701		bi_errorf("%s: %s '%s'", Tsynerr, cstrerror(errno), wp[0]);
3702	else {
3703#ifndef MKSH_NOPROSPECTOFWORK
3704		sigset_t omask, bmask;
3705
3706		/* block a number of signals from interrupting us, though */
3707		(void)sigemptyset(&bmask);
3708		(void)sigaddset(&bmask, SIGPIPE);
3709		(void)sigaddset(&bmask, SIGCHLD);
3710#ifdef SIGWINCH
3711		(void)sigaddset(&bmask, SIGWINCH);
3712#endif
3713#ifdef SIGINFO
3714		(void)sigaddset(&bmask, SIGINFO);
3715#endif
3716#ifdef SIGUSR1
3717		(void)sigaddset(&bmask, SIGUSR1);
3718#endif
3719#ifdef SIGUSR2
3720		(void)sigaddset(&bmask, SIGUSR2);
3721#endif
3722		sigprocmask(SIG_BLOCK, &bmask, &omask);
3723#endif
3724		if (select(1, NULL, NULL, NULL, &tv) == 0 || errno == EINTR)
3725			/*
3726			 * strictly speaking only for SIGALRM, but the
3727			 * execution may be interrupted by other signals
3728			 */
3729			rv = 0;
3730		else
3731			bi_errorf("%s: %s", Tselect, cstrerror(errno));
3732#ifndef MKSH_NOPROSPECTOFWORK
3733		/* this will re-schedule signal delivery */
3734		sigprocmask(SIG_SETMASK, &omask, NULL);
3735#endif
3736	}
3737	return (rv);
3738}
3739#endif
3740
3741#if !defined(MKSH_UNEMPLOYED) && HAVE_GETSID
3742static int
3743c_suspend(const char **wp)
3744{
3745	if (wp[1] != NULL) {
3746		bi_errorf("too many arguments");
3747		return (1);
3748	}
3749	if (Flag(FLOGIN)) {
3750		/* Can't suspend an orphaned process group. */
3751		if (getpgid(kshppid) == getpgid(0) ||
3752		    getsid(kshppid) != getsid(0)) {
3753			bi_errorf("can't suspend a login shell");
3754			return (1);
3755		}
3756	}
3757	j_suspend();
3758	return (0);
3759}
3760#endif
3761