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1 /*	$OpenBSD: var.c,v 1.34 2007/10/15 02:16:35 deraadt Exp $	*/
2 
3 /*-
4  * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
5  *	Thorsten Glaser <tg@mirbsd.org>
6  *
7  * Provided that these terms and disclaimer and all copyright notices
8  * are retained or reproduced in an accompanying document, permission
9  * is granted to deal in this work without restriction, including un-
10  * limited rights to use, publicly perform, distribute, sell, modify,
11  * merge, give away, or sublicence.
12  *
13  * This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
14  * the utmost extent permitted by applicable law, neither express nor
15  * implied; without malicious intent or gross negligence. In no event
16  * may a licensor, author or contributor be held liable for indirect,
17  * direct, other damage, loss, or other issues arising in any way out
18  * of dealing in the work, even if advised of the possibility of such
19  * damage or existence of a defect, except proven that it results out
20  * of said person's immediate fault when using the work as intended.
21  */
22 
23 #include "sh.h"
24 
25 #if defined(__OpenBSD__)
26 #include <sys/sysctl.h>
27 #endif
28 
29 __RCSID("$MirOS: src/bin/mksh/var.c,v 1.110 2010/07/25 11:35:43 tg Exp $");
30 
31 /*
32  * Variables
33  *
34  * WARNING: unreadable code, needs a rewrite
35  *
36  * if (flag&INTEGER), val.i contains integer value, and type contains base.
37  * otherwise, (val.s + type) contains string value.
38  * if (flag&EXPORT), val.s contains "name=value" for E-Z exporting.
39  */
40 static struct tbl vtemp;
41 static struct table specials;
42 static char *formatstr(struct tbl *, const char *);
43 static void exportprep(struct tbl *, const char *);
44 static int special(const char *);
45 static void unspecial(const char *);
46 static void getspec(struct tbl *);
47 static void setspec(struct tbl *);
48 static void unsetspec(struct tbl *);
49 static int getint(struct tbl *, mksh_ari_t *, bool);
50 static mksh_ari_t intval(struct tbl *);
51 static struct tbl *arraysearch(struct tbl *, uint32_t);
52 static const char *array_index_calc(const char *, bool *, uint32_t *);
53 static uint32_t oaathash_update(register uint32_t, register const uint8_t *,
54     register size_t);
55 static uint32_t oaathash_finalise(register uint32_t);
56 
57 uint8_t set_refflag = 0;
58 
59 /*
60  * create a new block for function calls and simple commands
61  * assume caller has allocated and set up e->loc
62  */
63 void
newblock(void)64 newblock(void)
65 {
66 	struct block *l;
67 	static const char *empty[] = { null };
68 
69 	l = alloc(sizeof(struct block), ATEMP);
70 	l->flags = 0;
71 	ainit(&l->area); /* todo: could use e->area (l->area => l->areap) */
72 	if (!e->loc) {
73 		l->argc = 0;
74 		l->argv = empty;
75 	} else {
76 		l->argc = e->loc->argc;
77 		l->argv = e->loc->argv;
78 	}
79 	l->exit = l->error = NULL;
80 	ktinit(&l->vars, &l->area, 0);
81 	ktinit(&l->funs, &l->area, 0);
82 	l->next = e->loc;
83 	e->loc = l;
84 }
85 
86 /*
87  * pop a block handling special variables
88  */
89 void
popblock(void)90 popblock(void)
91 {
92 	struct block *l = e->loc;
93 	struct tbl *vp, **vpp = l->vars.tbls, *vq;
94 	int i;
95 
96 	e->loc = l->next;	/* pop block */
97 	for (i = l->vars.size; --i >= 0; )
98 		if ((vp = *vpp++) != NULL && (vp->flag&SPECIAL)) {
99 			if ((vq = global(vp->name))->flag & ISSET)
100 				setspec(vq);
101 			else
102 				unsetspec(vq);
103 		}
104 	if (l->flags & BF_DOGETOPTS)
105 		user_opt = l->getopts_state;
106 	afreeall(&l->area);
107 	afree(l, ATEMP);
108 }
109 
110 /* called by main() to initialise variable data structures */
111 #define VARSPEC_DEFNS
112 #include "var_spec.h"
113 
114 enum var_specs {
115 #define VARSPEC_ENUMS
116 #include "var_spec.h"
117 	V_MAX
118 };
119 
120 static const char * const initvar_names[] = {
121 #define VARSPEC_ITEMS
122 #include "var_spec.h"
123 };
124 
125 void
initvar(void)126 initvar(void)
127 {
128 	int i = 0;
129 	struct tbl *tp;
130 
131 	ktinit(&specials, APERM,
132 	    /* must be 80% of 2^n (currently 12 specials) */ 16);
133 	while (i < V_MAX - 1) {
134 		tp = ktenter(&specials, initvar_names[i],
135 		    hash(initvar_names[i]));
136 		tp->flag = DEFINED|ISSET;
137 		tp->type = ++i;
138 	}
139 }
140 
141 /* Used to calculate an array index for global()/local(). Sets *arrayp to
142  * true if this is an array, sets *valp to the array index, returns
143  * the basename of the array.
144  */
145 static const char *
array_index_calc(const char * n,bool * arrayp,uint32_t * valp)146 array_index_calc(const char *n, bool *arrayp, uint32_t *valp)
147 {
148 	const char *p;
149 	int len;
150 	char *ap = NULL;
151 
152 	*arrayp = false;
153  redo_from_ref:
154 	p = skip_varname(n, false);
155 	if (!set_refflag && (p != n) && ksh_isalphx(n[0])) {
156 		struct block *l = e->loc;
157 		struct tbl *vp;
158 		char *vn;
159 		uint32_t h;
160 
161 		strndupx(vn, n, p - n, ATEMP);
162 		h = hash(vn);
163 		/* check if this is a reference */
164 		do {
165 			vp = ktsearch(&l->vars, vn, h);
166 		} while (!vp && (l = l->next));
167 		afree(vn, ATEMP);
168 		if (vp && (vp->flag & (DEFINED|ASSOC|ARRAY)) ==
169 		    (DEFINED|ASSOC)) {
170 			char *cp;
171 
172 			/* gotcha! */
173 			cp = shf_smprintf("%s%s", str_val(vp), p);
174 			afree(ap, ATEMP);
175 			n = ap = cp;
176 			goto redo_from_ref;
177 		}
178 	}
179 
180 	if (p != n && *p == '[' && (len = array_ref_len(p))) {
181 		char *sub, *tmp;
182 		mksh_ari_t rval;
183 
184 		/* Calculate the value of the subscript */
185 		*arrayp = true;
186 		strndupx(tmp, p + 1, len - 2, ATEMP);
187 		sub = substitute(tmp, 0);
188 		afree(tmp, ATEMP);
189 		strndupx(n, n, p - n, ATEMP);
190 		evaluate(sub, &rval, KSH_UNWIND_ERROR, true);
191 		*valp = (uint32_t)rval;
192 		afree(sub, ATEMP);
193 	}
194 	return (n);
195 }
196 
197 /*
198  * Search for variable, if not found create globally.
199  */
200 struct tbl *
global(const char * n)201 global(const char *n)
202 {
203 	struct block *l = e->loc;
204 	struct tbl *vp;
205 	int c;
206 	bool array;
207 	uint32_t h, val;
208 
209 	/* Check to see if this is an array */
210 	n = array_index_calc(n, &array, &val);
211 	h = hash(n);
212 	c = n[0];
213 	if (!ksh_isalphx(c)) {
214 		if (array)
215 			errorf("bad substitution");
216 		vp = &vtemp;
217 		vp->flag = DEFINED;
218 		vp->type = 0;
219 		vp->areap = ATEMP;
220 		*vp->name = c;
221 		if (ksh_isdigit(c)) {
222 			for (c = 0; ksh_isdigit(*n); n++)
223 				c = c*10 + *n-'0';
224 			if (c <= l->argc)
225 				/* setstr can't fail here */
226 				setstr(vp, l->argv[c], KSH_RETURN_ERROR);
227 			vp->flag |= RDONLY;
228 			return (vp);
229 		}
230 		vp->flag |= RDONLY;
231 		if (n[1] != '\0')
232 			return (vp);
233 		vp->flag |= ISSET|INTEGER;
234 		switch (c) {
235 		case '$':
236 			vp->val.i = kshpid;
237 			break;
238 		case '!':
239 			/* If no job, expand to nothing */
240 			if ((vp->val.i = j_async()) == 0)
241 				vp->flag &= ~(ISSET|INTEGER);
242 			break;
243 		case '?':
244 			vp->val.i = exstat;
245 			break;
246 		case '#':
247 			vp->val.i = l->argc;
248 			break;
249 		case '-':
250 			vp->flag &= ~INTEGER;
251 			vp->val.s = getoptions();
252 			break;
253 		default:
254 			vp->flag &= ~(ISSET|INTEGER);
255 		}
256 		return (vp);
257 	}
258 	for (l = e->loc; ; l = l->next) {
259 		vp = ktsearch(&l->vars, n, h);
260 		if (vp != NULL) {
261 			if (array)
262 				return (arraysearch(vp, val));
263 			else
264 				return (vp);
265 		}
266 		if (l->next == NULL)
267 			break;
268 	}
269 	vp = ktenter(&l->vars, n, h);
270 	if (array)
271 		vp = arraysearch(vp, val);
272 	vp->flag |= DEFINED;
273 	if (special(n))
274 		vp->flag |= SPECIAL;
275 	return (vp);
276 }
277 
278 /*
279  * Search for local variable, if not found create locally.
280  */
281 struct tbl *
local(const char * n,bool copy)282 local(const char *n, bool copy)
283 {
284 	struct block *l = e->loc;
285 	struct tbl *vp;
286 	bool array;
287 	uint32_t h, val;
288 
289 	/* Check to see if this is an array */
290 	n = array_index_calc(n, &array, &val);
291 	h = hash(n);
292 	if (!ksh_isalphx(*n)) {
293 		vp = &vtemp;
294 		vp->flag = DEFINED|RDONLY;
295 		vp->type = 0;
296 		vp->areap = ATEMP;
297 		return (vp);
298 	}
299 	vp = ktenter(&l->vars, n, h);
300 	if (copy && !(vp->flag & DEFINED)) {
301 		struct block *ll = l;
302 		struct tbl *vq = NULL;
303 
304 		while ((ll = ll->next) && !(vq = ktsearch(&ll->vars, n, h)))
305 			;
306 		if (vq) {
307 			vp->flag |= vq->flag &
308 			    (EXPORT | INTEGER | RDONLY | LJUST | RJUST |
309 			    ZEROFIL | LCASEV | UCASEV_AL | INT_U | INT_L);
310 			if (vq->flag & INTEGER)
311 				vp->type = vq->type;
312 			vp->u2.field = vq->u2.field;
313 		}
314 	}
315 	if (array)
316 		vp = arraysearch(vp, val);
317 	vp->flag |= DEFINED;
318 	if (special(n))
319 		vp->flag |= SPECIAL;
320 	return (vp);
321 }
322 
323 /* get variable string value */
324 char *
str_val(struct tbl * vp)325 str_val(struct tbl *vp)
326 {
327 	char *s;
328 
329 	if ((vp->flag&SPECIAL))
330 		getspec(vp);
331 	if (!(vp->flag&ISSET))
332 		s = null;		/* special to dollar() */
333 	else if (!(vp->flag&INTEGER))	/* string source */
334 		s = vp->val.s + vp->type;
335 	else {				/* integer source */
336 		/* worst case number length is when base=2 */
337 		/* 1 (minus) + 2 (base, up to 36) + 1 ('#') + number of bits
338 		 * in the mksh_uari_t + 1 (NUL) */
339 		char strbuf[1 + 2 + 1 + 8 * sizeof(mksh_uari_t) + 1];
340 		const char *digits = (vp->flag & UCASEV_AL) ?
341 		    digits_uc : digits_lc;
342 		mksh_uari_t n;
343 		int base;
344 
345 		s = strbuf + sizeof(strbuf);
346 		if (vp->flag & INT_U)
347 			n = vp->val.u;
348 		else
349 			n = (vp->val.i < 0) ? -vp->val.i : vp->val.i;
350 		base = (vp->type == 0) ? 10 : vp->type;
351 
352 		if (base == 1) {
353 			size_t sz = 1;
354 
355 			*(s = strbuf) = '1';
356 			s[1] = '#';
357 			if (!UTFMODE || ((n & 0xFF80) == 0xEF80))
358 				/* OPTU-16 -> raw octet */
359 				s[2] = n & 0xFF;
360 			else
361 				sz = utf_wctomb(s + 2, n);
362 			s[2 + sz] = '\0';
363 		} else {
364 			*--s = '\0';
365 			do {
366 				*--s = digits[n % base];
367 				n /= base;
368 			} while (n != 0);
369 			if (base != 10) {
370 				*--s = '#';
371 				*--s = digits[base % 10];
372 				if (base >= 10)
373 					*--s = digits[base / 10];
374 			}
375 			if (!(vp->flag & INT_U) && vp->val.i < 0)
376 				*--s = '-';
377 		}
378 		if (vp->flag & (RJUST|LJUST)) /* case already dealt with */
379 			s = formatstr(vp, s);
380 		else
381 			strdupx(s, s, ATEMP);
382 	}
383 	return (s);
384 }
385 
386 /* get variable integer value, with error checking */
387 static mksh_ari_t
intval(struct tbl * vp)388 intval(struct tbl *vp)
389 {
390 	mksh_ari_t num;
391 	int base;
392 
393 	base = getint(vp, &num, false);
394 	if (base == -1)
395 		/* XXX check calls - is error here ok by POSIX? */
396 		errorf("%s: bad number", str_val(vp));
397 	return (num);
398 }
399 
400 /* set variable to string value */
401 int
setstr(struct tbl * vq,const char * s,int error_ok)402 setstr(struct tbl *vq, const char *s, int error_ok)
403 {
404 	char *salloc = NULL;
405 	int no_ro_check = error_ok & 0x4;
406 
407 	error_ok &= ~0x4;
408 	if ((vq->flag & RDONLY) && !no_ro_check) {
409 		warningf(true, "%s: is read only", vq->name);
410 		if (!error_ok)
411 			errorfz();
412 		return (0);
413 	}
414 	if (!(vq->flag&INTEGER)) { /* string dest */
415 		if ((vq->flag&ALLOC)) {
416 			/* debugging */
417 			if (s >= vq->val.s &&
418 			    s <= vq->val.s + strlen(vq->val.s))
419 				internal_errorf(
420 				    "setstr: %s=%s: assigning to self",
421 				    vq->name, s);
422 			afree(vq->val.s, vq->areap);
423 		}
424 		vq->flag &= ~(ISSET|ALLOC);
425 		vq->type = 0;
426 		if (s && (vq->flag & (UCASEV_AL|LCASEV|LJUST|RJUST)))
427 			s = salloc = formatstr(vq, s);
428 		if ((vq->flag&EXPORT))
429 			exportprep(vq, s);
430 		else {
431 			strdupx(vq->val.s, s, vq->areap);
432 			vq->flag |= ALLOC;
433 		}
434 	} else {		/* integer dest */
435 		if (!v_evaluate(vq, s, error_ok, true))
436 			return (0);
437 	}
438 	vq->flag |= ISSET;
439 	if ((vq->flag&SPECIAL))
440 		setspec(vq);
441 	afree(salloc, ATEMP);
442 	return (1);
443 }
444 
445 /* set variable to integer */
446 void
setint(struct tbl * vq,mksh_ari_t n)447 setint(struct tbl *vq, mksh_ari_t n)
448 {
449 	if (!(vq->flag&INTEGER)) {
450 		struct tbl *vp = &vtemp;
451 		vp->flag = (ISSET|INTEGER);
452 		vp->type = 0;
453 		vp->areap = ATEMP;
454 		vp->val.i = n;
455 		/* setstr can't fail here */
456 		setstr(vq, str_val(vp), KSH_RETURN_ERROR);
457 	} else
458 		vq->val.i = n;
459 	vq->flag |= ISSET;
460 	if ((vq->flag&SPECIAL))
461 		setspec(vq);
462 }
463 
464 static int
getint(struct tbl * vp,mksh_ari_t * nump,bool arith)465 getint(struct tbl *vp, mksh_ari_t *nump, bool arith)
466 {
467 	char *s;
468 	int c, base, neg;
469 	bool have_base = false;
470 	mksh_ari_t num;
471 
472 	if (vp->flag&SPECIAL)
473 		getspec(vp);
474 	/* XXX is it possible for ISSET to be set and val.s to be 0? */
475 	if (!(vp->flag&ISSET) || (!(vp->flag&INTEGER) && vp->val.s == NULL))
476 		return (-1);
477 	if (vp->flag&INTEGER) {
478 		*nump = vp->val.i;
479 		return (vp->type);
480 	}
481 	s = vp->val.s + vp->type;
482 	if (s == NULL)	/* redundant given initial test */
483 		s = null;
484 	base = 10;
485 	num = 0;
486 	neg = 0;
487 	if (arith && *s == '0' && *(s+1)) {
488 		s++;
489 		if (*s == 'x' || *s == 'X') {
490 			s++;
491 			base = 16;
492 		} else if (vp->flag & ZEROFIL) {
493 			while (*s == '0')
494 				s++;
495 		} else
496 			base = 8;
497 		have_base = true;
498 	}
499 	for (c = *s++; c ; c = *s++) {
500 		if (c == '-') {
501 			neg++;
502 			continue;
503 		} else if (c == '#') {
504 			base = (int)num;
505 			if (have_base || base < 1 || base > 36)
506 				return (-1);
507 			if (base == 1) {
508 				unsigned int wc;
509 
510 				if (!UTFMODE)
511 					wc = *(unsigned char *)s;
512 				else if (utf_mbtowc(&wc, s) == (size_t)-1)
513 					/* OPTU-8 -> OPTU-16 */
514 					/*
515 					 * (with a twist: 1#\uEF80 converts
516 					 * the same as 1#\x80 does, thus is
517 					 * not round-tripping correctly XXX)
518 					 */
519 					wc = 0xEF00 + *(unsigned char *)s;
520 				*nump = (mksh_ari_t)wc;
521 				return (1);
522 			}
523 			num = 0;
524 			have_base = true;
525 			continue;
526 		} else if (ksh_isdigit(c))
527 			c -= '0';
528 		else if (ksh_islower(c))
529 			c -= 'a' - 10;
530 		else if (ksh_isupper(c))
531 			c -= 'A' - 10;
532 		else
533 			return (-1);
534 		if (c < 0 || c >= base)
535 			return (-1);
536 		num = num * base + c;
537 	}
538 	if (neg)
539 		num = -num;
540 	*nump = num;
541 	return (base);
542 }
543 
544 /* convert variable vq to integer variable, setting its value from vp
545  * (vq and vp may be the same)
546  */
547 struct tbl *
setint_v(struct tbl * vq,struct tbl * vp,bool arith)548 setint_v(struct tbl *vq, struct tbl *vp, bool arith)
549 {
550 	int base;
551 	mksh_ari_t num;
552 
553 	if ((base = getint(vp, &num, arith)) == -1)
554 		return (NULL);
555 	if (!(vq->flag & INTEGER) && (vq->flag & ALLOC)) {
556 		vq->flag &= ~ALLOC;
557 		afree(vq->val.s, vq->areap);
558 	}
559 	vq->val.i = num;
560 	if (vq->type == 0) /* default base */
561 		vq->type = base;
562 	vq->flag |= ISSET|INTEGER;
563 	if (vq->flag&SPECIAL)
564 		setspec(vq);
565 	return (vq);
566 }
567 
568 static char *
formatstr(struct tbl * vp,const char * s)569 formatstr(struct tbl *vp, const char *s)
570 {
571 	int olen, nlen;
572 	char *p, *q;
573 	size_t psiz;
574 
575 	olen = utf_mbswidth(s);
576 
577 	if (vp->flag & (RJUST|LJUST)) {
578 		if (!vp->u2.field)	/* default field width */
579 			vp->u2.field = olen;
580 		nlen = vp->u2.field;
581 	} else
582 		nlen = olen;
583 
584 	p = alloc((psiz = nlen * /* MB_LEN_MAX */ 3 + 1), ATEMP);
585 	if (vp->flag & (RJUST|LJUST)) {
586 		int slen = olen, i = 0;
587 
588 		if (vp->flag & RJUST) {
589 			const char *qq = s;
590 			int n = 0;
591 
592 			while (i < slen)
593 				i += utf_widthadj(qq, &qq);
594 			/* strip trailing spaces (AT&T uses qq[-1] == ' ') */
595 			while (qq > s && ksh_isspace(qq[-1])) {
596 				--qq;
597 				--slen;
598 			}
599 			if (vp->flag & ZEROFIL && vp->flag & INTEGER) {
600 				if (s[1] == '#')
601 					n = 2;
602 				else if (s[2] == '#')
603 					n = 3;
604 				if (vp->u2.field <= n)
605 					n = 0;
606 			}
607 			if (n) {
608 				memcpy(p, s, n);
609 				s += n;
610 			}
611 			while (slen > vp->u2.field)
612 				slen -= utf_widthadj(s, &s);
613 			if (vp->u2.field - slen)
614 				memset(p + n, (vp->flag & ZEROFIL) ? '0' : ' ',
615 				    vp->u2.field - slen);
616 			slen -= n;
617 			shf_snprintf(p + vp->u2.field - slen,
618 			    psiz - (vp->u2.field - slen),
619 			    "%.*s", slen, s);
620 		} else {
621 			/* strip leading spaces/zeros */
622 			while (ksh_isspace(*s))
623 				s++;
624 			if (vp->flag & ZEROFIL)
625 				while (*s == '0')
626 					s++;
627 			shf_snprintf(p, nlen + 1, "%-*.*s",
628 				vp->u2.field, vp->u2.field, s);
629 		}
630 	} else
631 		memcpy(p, s, strlen(s) + 1);
632 
633 	if (vp->flag & UCASEV_AL) {
634 		for (q = p; *q; q++)
635 			*q = ksh_toupper(*q);
636 	} else if (vp->flag & LCASEV) {
637 		for (q = p; *q; q++)
638 			*q = ksh_tolower(*q);
639 	}
640 
641 	return (p);
642 }
643 
644 /*
645  * make vp->val.s be "name=value" for quick exporting.
646  */
647 static void
exportprep(struct tbl * vp,const char * val)648 exportprep(struct tbl *vp, const char *val)
649 {
650 	char *xp;
651 	char *op = (vp->flag&ALLOC) ? vp->val.s : NULL;
652 	int namelen = strlen(vp->name);
653 	int vallen = strlen(val) + 1;
654 
655 	vp->flag |= ALLOC;
656 	xp = alloc(namelen + 1 + vallen, vp->areap);
657 	memcpy(vp->val.s = xp, vp->name, namelen);
658 	xp += namelen;
659 	*xp++ = '=';
660 	vp->type = xp - vp->val.s; /* offset to value */
661 	memcpy(xp, val, vallen);
662 	if (op != NULL)
663 		afree(op, vp->areap);
664 }
665 
666 /*
667  * lookup variable (according to (set&LOCAL)),
668  * set its attributes (INTEGER, RDONLY, EXPORT, TRACE, LJUST, RJUST, ZEROFIL,
669  * LCASEV, UCASEV_AL), and optionally set its value if an assignment.
670  */
671 struct tbl *
typeset(const char * var,Tflag set,Tflag clr,int field,int base)672 typeset(const char *var, Tflag set, Tflag clr, int field, int base)
673 {
674 	struct tbl *vp;
675 	struct tbl *vpbase, *t;
676 	char *tvar;
677 	const char *val;
678 	int len;
679 
680 	/* check for valid variable name, search for value */
681 	val = skip_varname(var, false);
682 	if (val == var)
683 		return (NULL);
684 	mkssert(var != NULL);
685 	mkssert(*var != 0);
686 	if (*val == '[') {
687 		if (set_refflag)
688 			errorf("%s: reference variable cannot be an array",
689 			    var);
690 		len = array_ref_len(val);
691 		if (len == 0)
692 			return (NULL);
693 		/* IMPORT is only used when the shell starts up and is
694 		 * setting up its environment. Allow only simple array
695 		 * references at this time since parameter/command substitution
696 		 * is preformed on the [expression] which would be a major
697 		 * security hole.
698 		 */
699 		if (set & IMPORT) {
700 			int i;
701 			for (i = 1; i < len - 1; i++)
702 				if (!ksh_isdigit(val[i]))
703 					return (NULL);
704 		}
705 		val += len;
706 	}
707 	if (*val == '=')
708 		strndupx(tvar, var, val++ - var, ATEMP);
709 	else {
710 		/* Importing from original environment: must have an = */
711 		if (set & IMPORT)
712 			return (NULL);
713 		strdupx(tvar, var, ATEMP);
714 		val = NULL;
715 		/* handle foo[*] ⇒ foo (whole array) mapping for R39b */
716 		len = strlen(tvar);
717 		if (len > 3 && tvar[len-3] == '[' && tvar[len-2] == '*' &&
718 		    tvar[len-1] == ']')
719 			tvar[len-3] = '\0';
720 	}
721 
722 	/* Prevent typeset from creating a local PATH/ENV/SHELL */
723 	if (Flag(FRESTRICTED) && (strcmp(tvar, "PATH") == 0 ||
724 	    strcmp(tvar, "ENV") == 0 || strcmp(tvar, "SHELL") == 0))
725 		errorf("%s: restricted", tvar);
726 
727 	vp = (set&LOCAL) ? local(tvar, (set & LOCAL_COPY) ? true : false) :
728 	    global(tvar);
729 	if (set_refflag == 2 && (vp->flag & (ARRAY|ASSOC)) == ASSOC)
730 		vp->flag &= ~ASSOC;
731 	else if (set_refflag == 1) {
732 		if (vp->flag & ARRAY) {
733 			struct tbl *a, *tmp;
734 
735 			/* Free up entire array */
736 			for (a = vp->u.array; a; ) {
737 				tmp = a;
738 				a = a->u.array;
739 				if (tmp->flag & ALLOC)
740 					afree(tmp->val.s, tmp->areap);
741 				afree(tmp, tmp->areap);
742 			}
743 			vp->u.array = NULL;
744 			vp->flag &= ~ARRAY;
745 		}
746 		vp->flag |= ASSOC;
747 	}
748 
749 	set &= ~(LOCAL|LOCAL_COPY);
750 
751 	vpbase = (vp->flag & ARRAY) ? global(arrayname(var)) : vp;
752 
753 	/* only allow export flag to be set. AT&T ksh allows any attribute to
754 	 * be changed which means it can be truncated or modified (-L/-R/-Z/-i)
755 	 */
756 	if ((vpbase->flag&RDONLY) &&
757 	    (val || clr || (set & ~EXPORT)))
758 		/* XXX check calls - is error here ok by POSIX? */
759 		errorf("%s: is read only", tvar);
760 	afree(tvar, ATEMP);
761 
762 	/* most calls are with set/clr == 0 */
763 	if (set | clr) {
764 		bool ok = true;
765 
766 		/* XXX if x[0] isn't set, there will be problems: need to have
767 		 * one copy of attributes for arrays...
768 		 */
769 		for (t = vpbase; t; t = t->u.array) {
770 			bool fake_assign;
771 			char *s = NULL;
772 			char *free_me = NULL;
773 
774 			fake_assign = (t->flag & ISSET) && (!val || t != vp) &&
775 			    ((set & (UCASEV_AL|LCASEV|LJUST|RJUST|ZEROFIL)) ||
776 			    ((t->flag & INTEGER) && (clr & INTEGER)) ||
777 			    (!(t->flag & INTEGER) && (set & INTEGER)));
778 			if (fake_assign) {
779 				if (t->flag & INTEGER) {
780 					s = str_val(t);
781 					free_me = NULL;
782 				} else {
783 					s = t->val.s + t->type;
784 					free_me = (t->flag & ALLOC) ? t->val.s :
785 					    NULL;
786 				}
787 				t->flag &= ~ALLOC;
788 			}
789 			if (!(t->flag & INTEGER) && (set & INTEGER)) {
790 				t->type = 0;
791 				t->flag &= ~ALLOC;
792 			}
793 			t->flag = (t->flag | set) & ~clr;
794 			/* Don't change base if assignment is to be done,
795 			 * in case assignment fails.
796 			 */
797 			if ((set & INTEGER) && base > 0 && (!val || t != vp))
798 				t->type = base;
799 			if (set & (LJUST|RJUST|ZEROFIL))
800 				t->u2.field = field;
801 			if (fake_assign) {
802 				if (!setstr(t, s, KSH_RETURN_ERROR)) {
803 					/* Somewhat arbitrary action here:
804 					 * zap contents of variable, but keep
805 					 * the flag settings.
806 					 */
807 					ok = false;
808 					if (t->flag & INTEGER)
809 						t->flag &= ~ISSET;
810 					else {
811 						if (t->flag & ALLOC)
812 							afree(t->val.s, t->areap);
813 						t->flag &= ~(ISSET|ALLOC);
814 						t->type = 0;
815 					}
816 				}
817 				if (free_me)
818 					afree(free_me, t->areap);
819 			}
820 		}
821 		if (!ok)
822 			errorfz();
823 	}
824 
825 	if (val != NULL) {
826 		if (vp->flag&INTEGER) {
827 			/* do not zero base before assignment */
828 			setstr(vp, val, KSH_UNWIND_ERROR | 0x4);
829 			/* Done after assignment to override default */
830 			if (base > 0)
831 				vp->type = base;
832 		} else
833 			/* setstr can't fail (readonly check already done) */
834 			setstr(vp, val, KSH_RETURN_ERROR | 0x4);
835 	}
836 
837 	/* only x[0] is ever exported, so use vpbase */
838 	if ((vpbase->flag&EXPORT) && !(vpbase->flag&INTEGER) &&
839 	    vpbase->type == 0)
840 		exportprep(vpbase, (vpbase->flag&ISSET) ? vpbase->val.s : null);
841 
842 	return (vp);
843 }
844 
845 /**
846  * Unset a variable. The flags can be:
847  * |1	= tear down entire array
848  * |2	= keep attributes, only unset content
849  */
850 void
unset(struct tbl * vp,int flags)851 unset(struct tbl *vp, int flags)
852 {
853 	if (vp->flag & ALLOC)
854 		afree(vp->val.s, vp->areap);
855 	if ((vp->flag & ARRAY) && (flags & 1)) {
856 		struct tbl *a, *tmp;
857 
858 		/* Free up entire array */
859 		for (a = vp->u.array; a; ) {
860 			tmp = a;
861 			a = a->u.array;
862 			if (tmp->flag & ALLOC)
863 				afree(tmp->val.s, tmp->areap);
864 			afree(tmp, tmp->areap);
865 		}
866 		vp->u.array = NULL;
867 	}
868 	if (flags & 2) {
869 		vp->flag &= ~(ALLOC|ISSET);
870 		return;
871 	}
872 	/* If foo[0] is being unset, the remainder of the array is kept... */
873 	vp->flag &= SPECIAL | ((flags & 1) ? 0 : ARRAY|DEFINED);
874 	if (vp->flag & SPECIAL)
875 		unsetspec(vp);	/* responsible for 'unspecial'ing var */
876 }
877 
878 /* return a pointer to the first char past a legal variable name (returns the
879  * argument if there is no legal name, returns a pointer to the terminating
880  * NUL if whole string is legal).
881  */
882 const char *
skip_varname(const char * s,int aok)883 skip_varname(const char *s, int aok)
884 {
885 	int alen;
886 
887 	if (s && ksh_isalphx(*s)) {
888 		while (*++s && ksh_isalnux(*s))
889 			;
890 		if (aok && *s == '[' && (alen = array_ref_len(s)))
891 			s += alen;
892 	}
893 	return (s);
894 }
895 
896 /* Return a pointer to the first character past any legal variable name */
897 const char *
skip_wdvarname(const char * s,int aok)898 skip_wdvarname(const char *s,
899     int aok)				/* skip array de-reference? */
900 {
901 	if (s[0] == CHAR && ksh_isalphx(s[1])) {
902 		do {
903 			s += 2;
904 		} while (s[0] == CHAR && ksh_isalnux(s[1]));
905 		if (aok && s[0] == CHAR && s[1] == '[') {
906 			/* skip possible array de-reference */
907 			const char *p = s;
908 			char c;
909 			int depth = 0;
910 
911 			while (1) {
912 				if (p[0] != CHAR)
913 					break;
914 				c = p[1];
915 				p += 2;
916 				if (c == '[')
917 					depth++;
918 				else if (c == ']' && --depth == 0) {
919 					s = p;
920 					break;
921 				}
922 			}
923 		}
924 	}
925 	return (s);
926 }
927 
928 /* Check if coded string s is a variable name */
929 int
is_wdvarname(const char * s,int aok)930 is_wdvarname(const char *s, int aok)
931 {
932 	const char *p = skip_wdvarname(s, aok);
933 
934 	return (p != s && p[0] == EOS);
935 }
936 
937 /* Check if coded string s is a variable assignment */
938 int
is_wdvarassign(const char * s)939 is_wdvarassign(const char *s)
940 {
941 	const char *p = skip_wdvarname(s, true);
942 
943 	return (p != s && p[0] == CHAR && p[1] == '=');
944 }
945 
946 /*
947  * Make the exported environment from the exported names in the dictionary.
948  */
949 char **
makenv(void)950 makenv(void)
951 {
952 	struct block *l;
953 	XPtrV denv;
954 	struct tbl *vp, **vpp;
955 	int i;
956 
957 	XPinit(denv, 64);
958 	for (l = e->loc; l != NULL; l = l->next)
959 		for (vpp = l->vars.tbls, i = l->vars.size; --i >= 0; )
960 			if ((vp = *vpp++) != NULL &&
961 			    (vp->flag&(ISSET|EXPORT)) == (ISSET|EXPORT)) {
962 				struct block *l2;
963 				struct tbl *vp2;
964 				uint32_t h = hash(vp->name);
965 
966 				/* unexport any redefined instances */
967 				for (l2 = l->next; l2 != NULL; l2 = l2->next) {
968 					vp2 = ktsearch(&l2->vars, vp->name, h);
969 					if (vp2 != NULL)
970 						vp2->flag &= ~EXPORT;
971 				}
972 				if ((vp->flag&INTEGER)) {
973 					/* integer to string */
974 					char *val;
975 					val = str_val(vp);
976 					vp->flag &= ~(INTEGER|RDONLY|SPECIAL);
977 					/* setstr can't fail here */
978 					setstr(vp, val, KSH_RETURN_ERROR);
979 				}
980 				XPput(denv, vp->val.s);
981 			}
982 	XPput(denv, NULL);
983 	return ((char **)XPclose(denv));
984 }
985 
986 /* Bob Jenkins' one-at-a-time hash */
987 static uint32_t
oaathash_update(register uint32_t h,register const uint8_t * cp,register size_t n)988 oaathash_update(register uint32_t h, register const uint8_t *cp,
989     register size_t n)
990 {
991 	while (n--) {
992 		h += *cp++;
993 		h += h << 10;
994 		h ^= h >> 6;
995 	}
996 
997 	return (h);
998 }
999 
1000 static uint32_t
oaathash_finalise(register uint32_t h)1001 oaathash_finalise(register uint32_t h)
1002 {
1003 	h += h << 3;
1004 	h ^= h >> 11;
1005 	h += h << 15;
1006 
1007 	return (h);
1008 }
1009 
1010 uint32_t
oaathash_full(register const uint8_t * bp)1011 oaathash_full(register const uint8_t *bp)
1012 {
1013 	register uint32_t h = 0;
1014 	register uint8_t c;
1015 
1016 	while ((c = *bp++)) {
1017 		h += c;
1018 		h += h << 10;
1019 		h ^= h >> 6;
1020 	}
1021 
1022 	return (oaathash_finalise(h));
1023 }
1024 
1025 void
change_random(const void * vp,size_t n)1026 change_random(const void *vp, size_t n)
1027 {
1028 	register uint32_t h = 0x100;
1029 #if defined(__OpenBSD__)
1030 	int mib[2];
1031 	uint8_t k[3];
1032 	size_t klen;
1033 #endif
1034 
1035 	kshstate_v.cr_dp = vp;
1036 	kshstate_v.cr_dsz = n;
1037 	gettimeofday(&kshstate_v.cr_tv, NULL);
1038 	h = oaathash_update(oaathash_update(h, (void *)&kshstate_v,
1039 	    sizeof(kshstate_v)), vp, n);
1040 	kshstate_v.lcg_state_ = oaathash_finalise(h);
1041 
1042 #if defined(__OpenBSD__)
1043 	/* OpenBSD, MirBSD: proper kernel entropy comes at zero cost */
1044 
1045 	mib[0] = CTL_KERN;
1046 	mib[1] = KERN_ARND;
1047 	klen = sizeof(k);
1048 	sysctl(mib, 2, k, &klen, &kshstate_v.lcg_state_,
1049 	    sizeof(kshstate_v.lcg_state_));
1050 	/* we ignore failures and take in k anyway */
1051 	h = oaathash_update(h, k, sizeof(k));
1052 	kshstate_v.lcg_state_ = oaathash_finalise(h);
1053 #elif defined(MKSH_A4PB)
1054 	/* forced by the user to use arc4random_pushb(3) • Cygwin? */
1055 	{
1056 		uint32_t prv;
1057 
1058 		prv = arc4random_pushb(&kshstate_v.lcg_state_,
1059 		    sizeof(kshstate_v.lcg_state_));
1060 		h = oaathash_update(h, &prv, sizeof(prv));
1061 	}
1062 	kshstate_v.lcg_state_ = oaathash_finalise(h);
1063 #endif
1064 }
1065 
1066 /*
1067  * handle special variables with side effects - PATH, SECONDS.
1068  */
1069 
1070 /* Test if name is a special parameter */
1071 static int
special(const char * name)1072 special(const char *name)
1073 {
1074 	struct tbl *tp;
1075 
1076 	tp = ktsearch(&specials, name, hash(name));
1077 	return (tp && (tp->flag & ISSET) ? tp->type : V_NONE);
1078 }
1079 
1080 /* Make a variable non-special */
1081 static void
unspecial(const char * name)1082 unspecial(const char *name)
1083 {
1084 	struct tbl *tp;
1085 
1086 	tp = ktsearch(&specials, name, hash(name));
1087 	if (tp)
1088 		ktdelete(tp);
1089 }
1090 
1091 static time_t seconds;		/* time SECONDS last set */
1092 static int user_lineno;		/* what user set $LINENO to */
1093 
1094 static void
getspec(struct tbl * vp)1095 getspec(struct tbl *vp)
1096 {
1097 	register mksh_ari_t i;
1098 	int st;
1099 
1100 	switch ((st = special(vp->name))) {
1101 	case V_SECONDS:
1102 		/*
1103 		 * On start up the value of SECONDS is used before
1104 		 * it has been set - don't do anything in this case
1105 		 * (see initcoms[] in main.c).
1106 		 */
1107 		if (vp->flag & ISSET) {
1108 			struct timeval tv;
1109 
1110 			gettimeofday(&tv, NULL);
1111 			i = tv.tv_sec - seconds;
1112 		} else
1113 			return;
1114 		break;
1115 	case V_RANDOM:
1116 		/*
1117 		 * this is the same Linear Congruential PRNG as Borland
1118 		 * C/C++ allegedly uses in its built-in rand() function
1119 		 */
1120 		i = ((kshstate_v.lcg_state_ =
1121 		    22695477 * kshstate_v.lcg_state_ + 1) >> 16) & 0x7FFF;
1122 		break;
1123 	case V_HISTSIZE:
1124 		i = histsize;
1125 		break;
1126 	case V_OPTIND:
1127 		i = user_opt.uoptind;
1128 		break;
1129 	case V_LINENO:
1130 		i = current_lineno + user_lineno;
1131 		break;
1132 	case V_COLUMNS:
1133 	case V_LINES:
1134 		/*
1135 		 * Do NOT export COLUMNS/LINES. Many applications
1136 		 * check COLUMNS/LINES before checking ws.ws_col/row,
1137 		 * so if the app is started with C/L in the environ
1138 		 * and the window is then resized, the app won't
1139 		 * see the change cause the environ doesn't change.
1140 		 */
1141 		change_winsz();
1142 		i = st == V_COLUMNS ? x_cols : x_lins;
1143 		break;
1144 	default:
1145 		/* do nothing, do not touch vp at all */
1146 		return;
1147 	}
1148 	vp->flag &= ~SPECIAL;
1149 	setint(vp, i);
1150 	vp->flag |= SPECIAL;
1151 }
1152 
1153 static void
setspec(struct tbl * vp)1154 setspec(struct tbl *vp)
1155 {
1156 	mksh_ari_t i;
1157 	char *s;
1158 	int st;
1159 
1160 	switch ((st = special(vp->name))) {
1161 	case V_PATH:
1162 		if (path)
1163 			afree(path, APERM);
1164 		s = str_val(vp);
1165 		strdupx(path, s, APERM);
1166 		flushcom(1);	/* clear tracked aliases */
1167 		return;
1168 	case V_IFS:
1169 		setctypes(s = str_val(vp), C_IFS);
1170 		ifs0 = *s;
1171 		return;
1172 	case V_TMPDIR:
1173 		if (tmpdir) {
1174 			afree(tmpdir, APERM);
1175 			tmpdir = NULL;
1176 		}
1177 		/* Use tmpdir iff it is an absolute path, is writable and
1178 		 * searchable and is a directory...
1179 		 */
1180 		{
1181 			struct stat statb;
1182 
1183 			s = str_val(vp);
1184 			if (s[0] == '/' && access(s, W_OK|X_OK) == 0 &&
1185 			    stat(s, &statb) == 0 && S_ISDIR(statb.st_mode))
1186 				strdupx(tmpdir, s, APERM);
1187 		}
1188 		break;
1189 #if HAVE_PERSISTENT_HISTORY
1190 	case V_HISTFILE:
1191 		sethistfile(str_val(vp));
1192 		break;
1193 #endif
1194 	case V_TMOUT:
1195 		/* AT&T ksh seems to do this (only listen if integer) */
1196 		if (vp->flag & INTEGER)
1197 			ksh_tmout = vp->val.i >= 0 ? vp->val.i : 0;
1198 		break;
1199 
1200 	/* common sub-cases */
1201 	case V_OPTIND:
1202 	case V_HISTSIZE:
1203 	case V_COLUMNS:
1204 	case V_LINES:
1205 	case V_RANDOM:
1206 	case V_SECONDS:
1207 	case V_LINENO:
1208 		vp->flag &= ~SPECIAL;
1209 		i = intval(vp);
1210 		vp->flag |= SPECIAL;
1211 		break;
1212 	default:
1213 		/* do nothing, do not touch vp at all */
1214 		return;
1215 	}
1216 
1217 	/* process the singular parts of the common cases */
1218 
1219 	switch (st) {
1220 	case V_OPTIND:
1221 		getopts_reset((int)i);
1222 		break;
1223 	case V_HISTSIZE:
1224 		sethistsize((int)i);
1225 		break;
1226 	case V_COLUMNS:
1227 		if (i >= MIN_COLS)
1228 			x_cols = i;
1229 		break;
1230 	case V_LINES:
1231 		if (i >= MIN_LINS)
1232 			x_lins = i;
1233 		break;
1234 	case V_RANDOM:
1235 		/*
1236 		 * mksh R39d+ no longer has the traditional repeatability
1237 		 * of $RANDOM sequences, but always retains state
1238 		 */
1239 		change_random(&i, sizeof(i));
1240 		break;
1241 	case V_SECONDS:
1242 		{
1243 			struct timeval tv;
1244 
1245 			gettimeofday(&tv, NULL);
1246 			seconds = tv.tv_sec - i;
1247 		}
1248 		break;
1249 	case V_LINENO:
1250 		/* The -1 is because line numbering starts at 1. */
1251 		user_lineno = (unsigned int)i - current_lineno - 1;
1252 		break;
1253 	}
1254 }
1255 
1256 static void
unsetspec(struct tbl * vp)1257 unsetspec(struct tbl *vp)
1258 {
1259 	switch (special(vp->name)) {
1260 	case V_PATH:
1261 		if (path)
1262 			afree(path, APERM);
1263 		strdupx(path, def_path, APERM);
1264 		flushcom(1);	/* clear tracked aliases */
1265 		break;
1266 	case V_IFS:
1267 		setctypes(" \t\n", C_IFS);
1268 		ifs0 = ' ';
1269 		break;
1270 	case V_TMPDIR:
1271 		/* should not become unspecial */
1272 		if (tmpdir) {
1273 			afree(tmpdir, APERM);
1274 			tmpdir = NULL;
1275 		}
1276 		break;
1277 	case V_LINENO:
1278 	case V_RANDOM:
1279 	case V_SECONDS:
1280 	case V_TMOUT:		/* AT&T ksh leaves previous value in place */
1281 		unspecial(vp->name);
1282 		break;
1283 
1284 	/*
1285 	 * AT&T ksh man page says OPTIND, OPTARG and _ lose special
1286 	 * meaning, but OPTARG does not (still set by getopts) and _ is
1287 	 * also still set in various places. Don't know what AT&T does
1288 	 * for HISTSIZE, HISTFILE. Unsetting these in AT&T ksh does not
1289 	 * loose the 'specialness': IFS, COLUMNS, PATH, TMPDIR
1290 	 */
1291 	}
1292 }
1293 
1294 /*
1295  * Search for (and possibly create) a table entry starting with
1296  * vp, indexed by val.
1297  */
1298 static struct tbl *
arraysearch(struct tbl * vp,uint32_t val)1299 arraysearch(struct tbl *vp, uint32_t val)
1300 {
1301 	struct tbl *prev, *curr, *news;
1302 	size_t len;
1303 
1304 	vp->flag = (vp->flag | (ARRAY|DEFINED)) & ~ASSOC;
1305 	/* The table entry is always [0] */
1306 	if (val == 0)
1307 		return (vp);
1308 	prev = vp;
1309 	curr = vp->u.array;
1310 	while (curr && curr->ua.index < val) {
1311 		prev = curr;
1312 		curr = curr->u.array;
1313 	}
1314 	if (curr && curr->ua.index == val) {
1315 		if (curr->flag&ISSET)
1316 			return (curr);
1317 		news = curr;
1318 	} else
1319 		news = NULL;
1320 	len = strlen(vp->name) + 1;
1321 	if (!news) {
1322 		news = alloc(offsetof(struct tbl, name[0]) + len, vp->areap);
1323 		memcpy(news->name, vp->name, len);
1324 	}
1325 	news->flag = (vp->flag & ~(ALLOC|DEFINED|ISSET|SPECIAL)) | AINDEX;
1326 	news->type = vp->type;
1327 	news->areap = vp->areap;
1328 	news->u2.field = vp->u2.field;
1329 	news->ua.index = val;
1330 
1331 	if (curr != news) {		/* not reusing old array entry */
1332 		prev->u.array = news;
1333 		news->u.array = curr;
1334 	}
1335 	return (news);
1336 }
1337 
1338 /* Return the length of an array reference (eg, [1+2]) - cp is assumed
1339  * to point to the open bracket. Returns 0 if there is no matching closing
1340  * bracket.
1341  */
1342 int
array_ref_len(const char * cp)1343 array_ref_len(const char *cp)
1344 {
1345 	const char *s = cp;
1346 	int c;
1347 	int depth = 0;
1348 
1349 	while ((c = *s++) && (c != ']' || --depth))
1350 		if (c == '[')
1351 			depth++;
1352 	if (!c)
1353 		return (0);
1354 	return (s - cp);
1355 }
1356 
1357 /*
1358  * Make a copy of the base of an array name
1359  */
1360 char *
arrayname(const char * str)1361 arrayname(const char *str)
1362 {
1363 	const char *p;
1364 	char *rv;
1365 
1366 	if ((p = cstrchr(str, '[')) == 0)
1367 		/* Shouldn't happen, but why worry? */
1368 		strdupx(rv, str, ATEMP);
1369 	else
1370 		strndupx(rv, str, p - str, ATEMP);
1371 
1372 	return (rv);
1373 }
1374 
1375 /* set (or overwrite, if reset) the array variable var to the values in vals */
1376 mksh_uari_t
set_array(const char * var,bool reset,const char ** vals)1377 set_array(const char *var, bool reset, const char **vals)
1378 {
1379 	struct tbl *vp, *vq;
1380 	mksh_uari_t i;
1381 	const char *ccp;
1382 #ifndef MKSH_SMALL
1383 	char *cp;
1384 	mksh_uari_t j;
1385 #endif
1386 
1387 	/* to get local array, use "typeset foo; set -A foo" */
1388 	vp = global(var);
1389 
1390 	/* Note: AT&T ksh allows set -A but not set +A of a read-only var */
1391 	if ((vp->flag&RDONLY))
1392 		errorf("%s: is read only", var);
1393 	/* This code is quite non-optimal */
1394 	if (reset)
1395 		/* trash existing values and attributes */
1396 		unset(vp, 1);
1397 	/* todo: would be nice for assignment to completely succeed or
1398 	 * completely fail. Only really effects integer arrays:
1399 	 * evaluation of some of vals[] may fail...
1400 	 */
1401 	i = 0;
1402 #ifndef MKSH_SMALL
1403 	j = 0;
1404 #else
1405 #define j i
1406 #endif
1407 	while ((ccp = vals[i])) {
1408 #ifndef MKSH_SMALL
1409 		if (*ccp == '[') {
1410 			int level = 0;
1411 
1412 			while (*ccp) {
1413 				if (*ccp == ']' && --level == 0)
1414 					break;
1415 				if (*ccp == '[')
1416 					++level;
1417 				++ccp;
1418 			}
1419 			if (*ccp == ']' && level == 0 && ccp[1] == '=') {
1420 				strndupx(cp, vals[i] + 1, ccp - (vals[i] + 1),
1421 				    ATEMP);
1422 				evaluate(substitute(cp, 0), (mksh_ari_t *)&j,
1423 				    KSH_UNWIND_ERROR, true);
1424 				afree(cp, ATEMP);
1425 				ccp += 2;
1426 			} else
1427 				ccp = vals[i];
1428 		}
1429 #endif
1430 
1431 		vq = arraysearch(vp, j);
1432 		/* would be nice to deal with errors here... (see above) */
1433 		setstr(vq, ccp, KSH_RETURN_ERROR);
1434 		i++;
1435 #ifndef MKSH_SMALL
1436 		j++;
1437 #endif
1438 	}
1439 
1440 	return (i);
1441 }
1442 
1443 void
change_winsz(void)1444 change_winsz(void)
1445 {
1446 	if (x_lins < 0) {
1447 		/* first time initialisation */
1448 #ifdef TIOCGWINSZ
1449 		if (tty_fd < 0)
1450 			/* non-FTALKING, try to get an fd anyway */
1451 			tty_init(false, false);
1452 #endif
1453 		x_cols = -1;
1454 	}
1455 
1456 #ifdef TIOCGWINSZ
1457 	/* check if window size has changed */
1458 	if (tty_fd >= 0) {
1459 		struct winsize ws;
1460 
1461 		if (ioctl(tty_fd, TIOCGWINSZ, &ws) >= 0) {
1462 			if (ws.ws_col)
1463 				x_cols = ws.ws_col;
1464 			if (ws.ws_row)
1465 				x_lins = ws.ws_row;
1466 		}
1467 	}
1468 #endif
1469 
1470 	/* bounds check for sane values, use defaults otherwise */
1471 	if (x_cols < MIN_COLS)
1472 		x_cols = 80;
1473 	if (x_lins < MIN_LINS)
1474 		x_lins = 24;
1475 
1476 #ifdef SIGWINCH
1477 	got_winch = 0;
1478 #endif
1479 }
1480 
1481 uint32_t
evilhash(const char * s)1482 evilhash(const char *s)
1483 {
1484 	register uint32_t h = 0x100;
1485 
1486 	h = oaathash_update(h, (void *)&kshstate_f, sizeof(kshstate_f));
1487 	kshstate_f.h = oaathash_full((const uint8_t *)s);
1488 	return (oaathash_finalise(oaathash_update(h,
1489 	    (void *)&kshstate_f.h, sizeof(kshstate_f.h))));
1490 }
1491