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#include "sh.h"
2 
#include "ksh_time.h"
3 
#include "ksh_limval.h"
4 
#include "ksh_stat.h"
5 
#include <ctype.h>
6 
 
7 
/*
8 
 * Variables
9 
 *
10 
 * WARNING: unreadable code, needs a rewrite
11 
 *
12 
 * if (flag&INTEGER), val.i contains integer value, and type contains base.
13 
 * otherwise, (val.s + type) contains string value.
14 
 * if (flag&EXPORT), val.s contains "name=value" for E-Z exporting.
15 
 */
16 
static	struct tbl vtemp;
17 
static	struct table specials;
18 
static char	*formatstr	ARGS((struct tbl *vp, const char *s));
19 
static void	export		ARGS((struct tbl *vp, const char *val));
20 
static int	special		ARGS((const char *name));
21 
static void	unspecial	ARGS((const char *name));
22 
static void	getspec		ARGS((struct tbl *vp));
23 
static void	setspec		ARGS((struct tbl *vp));
24 
static void	unsetspec	ARGS((struct tbl *vp));
25 
static struct tbl *arraysearch  ARGS((struct tbl *, int));
26 
 
27 
/*
28 
 * create a new block for function calls and simple commands
29 
 * assume caller has allocated and set up e->loc
30 
 */
31 
void
32 
newblock()
33 
{
34 
	register struct block *l;
35 
	static char *const empty[] = {null};
36 
 
37 
	l = (struct block *) alloc(sizeof(struct block), ATEMP);
38 
	l->flags = 0;
39 
	ainit(&l->area); /* todo: could use e->area (l->area => l->areap) */
40 
	if (!e->loc) {
41 
		l->argc = 0;
42 
		l->argv = (char **) empty;
43 
	} else {
44 
		l->argc = e->loc->argc;
45 
		l->argv = e->loc->argv;
46 
	}
47 
	l->exit = l->error = NULL;
48 
	tinit(&l->vars, &l->area, 0);
49 
	tinit(&l->funs, &l->area, 0);
50 
	l->next = e->loc;
51 
	e->loc = l;
52 
}
53 
 
54 
/*
55 
 * pop a block handling special variables
56 
 */
57 
void
58 
popblock()
59 
{
60 
	register struct block *l = e->loc;
61 
	register struct tbl *vp, **vpp = l->vars.tbls, *vq;
62 
	register int i;
63 
 
64 
	e->loc = l->next;	/* pop block */
65 
	for (i = l->vars.size; --i >= 0; )
66 
		if ((vp = *vpp++) != NULL && (vp->flag&SPECIAL))
67 
			if ((vq = global(vp->name))->flag & ISSET)
68 
				setspec(vq);
69 
			else
70 
				unsetspec(vq);
71 
	if (l->flags & BF_DOGETOPTS)
72 
		user_opt = l->getopts_state;
73 
	afreeall(&l->area);
74 
	afree(l, ATEMP);
75 
}
76 
 
77 
/* called by main() to initialize variable data structures */
78 
void
79 
initvar()
80 
{
81 
	static const struct {
82 
		const char *name;
83 
		int v;
84 
	} names[] = {
85 
			{ "COLUMNS",		V_COLUMNS },
86 
			{ "IFS",		V_IFS },
87 
			{ "OPTIND",		V_OPTIND },
88 
			{ "PATH",		V_PATH },
89 
			{ "POSIXLY_CORRECT",	V_POSIXLY_CORRECT },
90 
			{ "TMPDIR",		V_TMPDIR },
91 
#ifdef HISTORY
92 
			{ "HISTFILE",		V_HISTFILE },
93 
			{ "HISTSIZE",		V_HISTSIZE },
94 
#endif /* HISTORY */
95 
#ifdef EDIT
96 
			{ "EDITOR",		V_EDITOR },
97 
			{ "VISUAL",		V_VISUAL },
98 
#endif /* EDIT */
99 
#ifdef KSH
100 
			{ "MAIL",		V_MAIL },
101 
			{ "MAILCHECK",		V_MAILCHECK },
102 
			{ "MAILPATH",		V_MAILPATH },
103 
			{ "RANDOM",		V_RANDOM },
104 
			{ "SECONDS",		V_SECONDS },
105 
			{ "TMOUT",		V_TMOUT },
106 
#endif /* KSH */
107 
			{ "LINENO",		V_LINENO },
108 
			{ (char *) 0,	0 }
109 
		};
110 
	int i;
111 
	struct tbl *tp;
112 
 
113 
	tinit(&specials, APERM, 32); /* must be 2^n (currently 17 specials) */
114 
	for (i = 0; names[i].name; i++) {
115 
		tp = tenter(&specials, names[i].name, hash(names[i].name));
116 
		tp->flag = DEFINED|ISSET;
117 
		tp->type = names[i].v;
118 
	}
119 
}
120 
 
121 
/* Used to calculate an array index for global()/local().  Sets *arrayp to
122 
 * non-zero if this is an array, sets *valp to the array index, returns
123 
 * the basename of the array.
124 
 */
125 
const char *
126 
array_index_calc(const char *n, bool_t *arrayp, int *valp)
127 
{
128 
	const char *p;
129 
	int len;
130 
 
131 
	*arrayp = FALSE;
132 
	p = skip_varname(n, FALSE);
133 
	if (p != n && *p == '[' && (len = array_ref_len(p))) {
134 
		char *sub, *tmp;
135 
		long rval;
136 
 
137 
		/* Calculate the value of the subscript */
138 
		*arrayp = TRUE;
139 
		tmp = str_nsave(p+1, len-2, ATEMP);
140 
		sub = substitute(tmp, 0);
141 
		afree(tmp, ATEMP);
142 
		n = str_nsave(n, p - n, ATEMP);
143 
		evaluate(sub, &rval, KSH_UNWIND_ERROR);
144 
		if (rval < 0 || rval > ARRAYMAX)
145 
			errorf("%s: subscript out of range", n);
146 
		*valp = rval;
147 
		afree(sub, ATEMP);
148 
	}
149 
	return n;
150 
}
151 
 
152 
/*
153 
 * Search for variable, if not found create globally.
154 
 */
155 
struct tbl *
156 
global(n)
157 
	register const char *n;
158 
{
159 
	register struct block *l = e->loc;
160 
	register struct tbl *vp;
161 
	register int c;
162 
	unsigned h;
163 
	bool_t	 array;
164 
	int	 val;
165 
 
166 
	/* Check to see if this is an array */
167 
	n = array_index_calc(n, &array, &val);
168 
	h = hash(n);
169 
	c = n[0];
170 
	if (!letter(c)) {
171 
		if (array)
172 
			errorf("bad substitution");
173 
		vp = &vtemp;
174 
		vp->flag = DEFINED;
175 
		vp->type = 0;
176 
		vp->areap = ATEMP;
177 
		*vp->name = c;
178 
		if (digit(c)) {
179 
			for (c = 0; digit(*n); n++)
180 
				c = c*10 + *n-'0';
181 
			if (c <= l->argc)
182 
				/* setstr can't fail here */
183 
				setstr(vp, l->argv[c], KSH_RETURN_ERROR);
184 
			vp->flag |= RDONLY;
185 
			return vp;
186 
		}
187 
		vp->flag |= RDONLY;
188 
		if (n[1] != '\0')
189 
			return vp;
190 
		vp->flag |= ISSET|INTEGER;
191 
		switch (c) {
192 
		  case '$':
193 
			vp->val.i = kshpid;
194 
			break;
195 
		  case '!':
196 
			/* If no job, expand to nothing */
197 
			if ((vp->val.i = j_async()) == 0)
198 
				vp->flag &= ~(ISSET|INTEGER);
199 
			break;
200 
		  case '?':
201 
			vp->val.i = exstat;
202 
			break;
203 
		  case '#':
204 
			vp->val.i = l->argc;
205 
			break;
206 
		  case '-':
207 
			vp->flag &= ~INTEGER;
208 
			vp->val.s = getoptions();
209 
			break;
210 
		  default:
211 
			vp->flag &= ~(ISSET|INTEGER);
212 
		}
213 
		return vp;
214 
	}
215 
	for (l = e->loc; ; l = l->next) {
216 
		vp = tsearch(&l->vars, n, h);
217 
		if (vp != NULL)
218 
			if (array)
219 
				return arraysearch(vp, val);
220 
			else
221 
				return vp;
222 
		if (l->next == NULL)
223 
			break;
224 
	}
225 
	vp = tenter(&l->vars, n, h);
226 
	if (array)
227 
		vp = arraysearch(vp, val);
228 
	vp->flag |= DEFINED;
229 
	if (special(n))
230 
		vp->flag |= SPECIAL;
231 
	return vp;
232 
}
233 
 
234 
/*
235 
 * Search for local variable, if not found create locally.
236 
 */
237 
struct tbl *
238 
local(n, copy)
239 
	register const char *n;
240 
	bool_t copy;
241 
{
242 
	register struct block *l = e->loc;
243 
	register struct tbl *vp;
244 
	unsigned h;
245 
	bool_t	 array;
246 
	int	 val;
247 
 
248 
	/* Check to see if this is an array */
249 
	n = array_index_calc(n, &array, &val);
250 
	h = hash(n);
251 
	if (!letter(*n)) {
252 
		vp = &vtemp;
253 
		vp->flag = DEFINED|RDONLY;
254 
		vp->type = 0;
255 
		vp->areap = ATEMP;
256 
		return vp;
257 
	}
258 
	vp = tenter(&l->vars, n, h);
259 
	if (copy && !(vp->flag & DEFINED)) {
260 
		struct block *ll = l;
261 
		struct tbl *vq = (struct tbl *) 0;
262 
 
263 
		while ((ll = ll->next) && !(vq = tsearch(&ll->vars, n, h)))
264 
			;
265 
		if (vq) {
266 
			vp->flag |= vq->flag & (EXPORT|INTEGER|RDONLY
267 
						|LJUST|RJUST|ZEROFIL
268 
						|LCASEV|UCASEV_AL|INT_U|INT_L);
269 
			if (vq->flag & INTEGER)
270 
				vp->type = vq->type;
271 
			vp->u2.field = vq->u2.field;
272 
		}
273 
	}
274 
	if (array)
275 
		vp = arraysearch(vp, val);
276 
	vp->flag |= DEFINED;
277 
	if (special(n))
278 
		vp->flag |= SPECIAL;
279 
	return vp;
280 
}
281 
 
282 
/* get variable string value */
283 
char *
284 
str_val(vp)
285 
	register struct tbl *vp;
286 
{
287 
	char *s;
288 
 
289 
	if ((vp->flag&SPECIAL))
290 
		getspec(vp);
291 
	if (!(vp->flag&ISSET))
292 
		s = null;		/* special to dollar() */
293 
	else if (!(vp->flag&INTEGER))	/* string source */
294 
		s = vp->val.s + vp->type;
295 
	else {				/* integer source */
296 
		/* worst case number length is when base=2, so use BITS(long) */
297 
			     /* minus base #     number    null */
298 
		static char strbuf[1 + 2 + 1 + BITS(long) + 1];
299 
		const char *digits = (vp->flag & UCASEV_AL) ?
300 
				  "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
301 
				: "0123456789abcdefghijklmnopqrstuvwxyz";
302 
		register unsigned long n;
303 
		register int base;
304 
 
305 
		s = strbuf + sizeof(strbuf);
306 
		if (vp->flag & INT_U)
307 
			n = (unsigned long) vp->val.i;
308 
		else
309 
			n = (vp->val.i < 0) ? -vp->val.i : vp->val.i;
310 
		base = (vp->type == 0) ? 10 : vp->type;
311 
 
312 
		*--s = '\0';
313 
		do {
314 
			*--s = digits[n % base];
315 
			n /= base;
316 
		} while (n != 0);
317 
		if (base != 10) {
318 
			*--s = '#';
319 
			*--s = digits[base % 10];
320 
			if (base >= 10)
321 
				*--s = digits[base / 10];
322 
		}
323 
		if (!(vp->flag & INT_U) && vp->val.i < 0)
324 
			*--s = '-';
325 
		if (vp->flag & (RJUST|LJUST)) /* case already dealt with */
326 
			s = formatstr(vp, s);
327 
	}
328 
	return s;
329 
}
330 
 
331 
/* get variable integer value, with error checking */
332 
long
333 
intval(vp)
334 
	register struct tbl *vp;
335 
{
336 
	long num;
337 
	int base;
338 
 
339 
	base = getint(vp, &num);
340 
	if (base == -1)
341 
		/* XXX check calls - is error here ok by POSIX? */
342 
		errorf("%s: bad number", str_val(vp));
343 
	return num;
344 
}
345 
 
346 
/* set variable to string value */
347 
int
348 
setstr(vq, s, error_ok)
349 
	register struct tbl *vq;
350 
	const char *s;
351 
	int error_ok;
352 
{
353 
	if (vq->flag & RDONLY) {
354 
		warningf(TRUE, "%s: is read only", vq->name);
355 
		if (!error_ok)
356 
			errorf(null);
357 
		return 0;
358 
	}
359 
	if (!(vq->flag&INTEGER)) { /* string dest */
360 
		if ((vq->flag&ALLOC)) {
361 
			/* debugging */
362 
			if (s >= vq->val.s
363 
			    && s <= vq->val.s + strlen(vq->val.s))
364 
				internal_errorf(TRUE,
365 
				    "setstr: %s=%s: assigning to self",
366 
				    vq->name, s);
367 
			afree((void*)vq->val.s, vq->areap);
368 
		}
369 
		vq->flag &= ~(ISSET|ALLOC);
370 
		vq->type = 0;
371 
		if (s && (vq->flag & (UCASEV_AL|LCASEV|LJUST|RJUST)))
372 
			s = formatstr(vq, s);
373 
		if ((vq->flag&EXPORT))
374 
			export(vq, s);
375 
		else {
376 
			vq->val.s = str_save(s, vq->areap);
377 
			if (vq->val.s)		/* <sjg> don't lie */
378 
				vq->flag |= ALLOC;
379 
		}
380 
	} else			/* integer dest */
381 
		if (!v_evaluate(vq, s, error_ok))
382 
			return 0;
383 
	vq->flag |= ISSET;
384 
	if ((vq->flag&SPECIAL))
385 
		setspec(vq);
386 
	return 1;
387 
}
388 
 
389 
/* set variable to integer */
390 
void
391 
setint(vq, n)
392 
	register struct tbl *vq;
393 
	long n;
394 
{
395 
	if (!(vq->flag&INTEGER)) {
396 
		register struct tbl *vp = &vtemp;
397 
		vp->flag = (ISSET|INTEGER);
398 
		vp->type = 0;
399 
		vp->areap = ATEMP;
400 
		vp->val.i = n;
401 
		/* setstr can't fail here */
402 
		setstr(vq, str_val(vp), KSH_RETURN_ERROR);
403 
	} else
404 
		vq->val.i = n;
405 
	vq->flag |= ISSET;
406 
	if ((vq->flag&SPECIAL))
407 
		setspec(vq);
408 
}
409 
 
410 
int
411 
getint(vp, nump)
412 
	struct tbl *vp;
413 
	long *nump;
414 
{
415 
	register char *s;
416 
	register int c;
417 
	int base, neg;
418 
	int have_base = 0;
419 
	long num;
420 
 
421 
	if (vp->flag&SPECIAL)
422 
		getspec(vp);
423 
	/* XXX is it possible for ISSET to be set and val.s to be 0? */
424 
	if (!(vp->flag&ISSET) || (!(vp->flag&INTEGER) && vp->val.s == NULL))
425 
		return -1;
426 
	if (vp->flag&INTEGER) {
427 
		*nump = vp->val.i;
428 
		return vp->type;
429 
	}
430 
	s = vp->val.s + vp->type;
431 
	if (s == NULL)	/* redundent given initial test */
432 
		s = null;
433 
	base = 10;
434 
	num = 0;
435 
	neg = 0;
436 
	for (c = *s++; c ; c = *s++) {
437 
		if (c == '-') {
438 
			neg++;
439 
		} else if (c == '#') {
440 
			base = (int) num;
441 
			if (have_base || base < 2 || base > 36)
442 
				return -1;
443 
			num = 0;
444 
			have_base = 1;
445 
		} else if (letnum(c)) {
446 
			if (isdigit(c))
447 
				c -= '0';
448 
			else if (islower(c))
449 
				c -= 'a' - 10; /* todo: assumes ascii */
450 
			else if (isupper(c))
451 
				c -= 'A' - 10; /* todo: assumes ascii */
452 
			else
453 
				c = -1; /* _: force error */
454 
			if (c < 0 || c >= base)
455 
				return -1;
456 
			num = num * base + c;
457 
		} else
458 
			return -1;
459 
	}
460 
	if (neg)
461 
		num = -num;
462 
	*nump = num;
463 
	return base;
464 
}
465 
 
466 
/* convert variable vq to integer variable, setting its value from vp
467 
 * (vq and vp may be the same)
468 
 */
469 
struct tbl *
470 
setint_v(vq, vp)
471 
	register struct tbl *vq, *vp;
472 
{
473 
	int base;
474 
	long num;
475 
 
476 
	if ((base = getint(vp, &num)) == -1)
477 
		return NULL;
478 
	if (!(vq->flag & INTEGER) && (vq->flag & ALLOC)) {
479 
		vq->flag &= ~ALLOC;
480 
		afree(vq->val.s, vq->areap);
481 
	}
482 
	vq->val.i = num;
483 
	if (vq->type == 0) /* default base */
484 
		vq->type = base;
485 
	vq->flag |= ISSET|INTEGER;
486 
	if (vq->flag&SPECIAL)
487 
		setspec(vq);
488 
	return vq;
489 
}
490 
 
491 
static char *
492 
formatstr(vp, s)
493 
	struct tbl *vp;
494 
	const char *s;
495 
{
496 
	int olen, nlen;
497 
	char *p, *q;
498 
 
499 
	olen = strlen(s);
500 
 
501 
	if (vp->flag & (RJUST|LJUST)) {
502 
		if (!vp->u2.field)	/* default field width */
503 
			vp->u2.field = olen;
504 
		nlen = vp->u2.field;
505 
	} else
506 
		nlen = olen;
507 
 
508 
	p = (char *) alloc(nlen + 1, ATEMP);
509 
	if (vp->flag & (RJUST|LJUST)) {
510 
		int slen;
511 
 
512 
		if (vp->flag & RJUST) {
513 
			const char *q = s + olen;
514 
			/* strip trailing spaces (at&t ksh uses q[-1] == ' ') */
515 
			while (q > s && isspace(q[-1]))
516 
				--q;
517 
			slen = q - s;
518 
			if (slen > vp->u2.field) {
519 
				s += slen - vp->u2.field;
520 
				slen = vp->u2.field;
521 
			}
522 
			shf_snprintf(p, nlen + 1,
523 
				((vp->flag & ZEROFIL) && digit(*s)) ?
524 
					  "%0*s%.*s" : "%*s%.*s",
525 
				vp->u2.field - slen, null, slen, s);
526 
		} else {
527 
			/* strip leading spaces/zeros */
528 
			while (isspace(*s))
529 
				s++;
530 
			if (vp->flag & ZEROFIL)
531 
				while (*s == '0')
532 
					s++;
533 
			shf_snprintf(p, nlen + 1, "%-*.*s",
534 
				vp->u2.field, vp->u2.field, s);
535 
		}
536 
	} else
537 
		memcpy(p, s, olen + 1);
538 
 
539 
	if (vp->flag & UCASEV_AL) {
540 
		for (q = p; *q; q++)
541 
			if (islower(*q))
542 
				*q = toupper(*q);
543 
	} else if (vp->flag & LCASEV) {
544 
		for (q = p; *q; q++)
545 
			if (isupper(*q))
546 
				*q = tolower(*q);
547 
	}
548 
 
549 
	return p;
550 
}
551 
 
552 
/*
553 
 * make vp->val.s be "name=value" for quick exporting.
554 
 */
555 
static void
556 
export(vp, val)
557 
	register struct tbl *vp;
558 
	const char *val;
559 
{
560 
	register char *xp;
561 
	char *op = (vp->flag&ALLOC) ? vp->val.s : NULL;
562 
	int namelen = strlen(vp->name);
563 
	int vallen = strlen(val) + 1;
564 
 
565 
	vp->flag |= ALLOC;
566 
	xp = (char*)alloc(namelen + 1 + vallen, vp->areap);
567 
	memcpy(vp->val.s = xp, vp->name, namelen);
568 
	xp += namelen;
569 
	*xp++ = '=';
570 
	vp->type = xp - vp->val.s; /* offset to value */
571 
	memcpy(xp, val, vallen);
572 
	if (op != NULL)
573 
		afree((void*)op, vp->areap);
574 
}
575 
 
576 
/*
577 
 * lookup variable (according to (set&LOCAL)),
578 
 * set its attributes (INTEGER, RDONLY, EXPORT, TRACE, LJUST, RJUST, ZEROFIL,
579 
 * LCASEV, UCASEV_AL), and optionally set its value if an assignment.
580 
 */
581 
struct tbl *
582 
typeset(var, set, clr, field, base)
583 
	register const char *var;
584 
	Tflag clr, set;
585 
	int field, base;
586 
{
587 
	register struct tbl *vp;
588 
	struct tbl *vpbase, *t;
589 
	char *tvar;
590 
	const char *val;
591 
 
592 
	/* check for valid variable name, search for value */
593 
	val = skip_varname(var, FALSE);
594 
	if (val == var)
595 
		return NULL;
596 
	if (*val == '[') {
597 
		int len;
598 
 
599 
		len = array_ref_len(val);
600 
		if (len == 0)
601 
			return NULL;
602 
		/* IMPORT is only used when the shell starts up and is
603 
		 * setting up its environment.  Allow only simple array
604 
		 * references at this time since parameter/command substitution
605 
		 * is preformed on the [expression], which would be a major
606 
		 * security hole.
607 
		 */
608 
		if (set & IMPORT) {
609 
			int i;
610 
			for (i = 1; i < len - 1; i++)
611 
				if (!digit(val[i]))
612 
					return NULL;
613 
		}
614 
		val += len;
615 
	}
616 
	if (*val == '=')
617 
		tvar = str_nsave(var, val++ - var, ATEMP);
618 
	else {
619 
		/* Importing from original envirnment: must have an = */
620 
		if (set & IMPORT)
621 
			return NULL;
622 
		tvar = (char *) var;
623 
		val = NULL;
624 
	}
625 
 
626 
	/* Prevent typeset from creating a local PATH/ENV/SHELL */
627 
	if (Flag(FRESTRICTED) && (strcmp(tvar, "PATH") == 0
628 
				  || strcmp(tvar, "ENV") == 0
629 
				  || strcmp(tvar, "SHELL") == 0))
630 
		errorf("%s: restricted", tvar);
631 
 
632 
	vp = (set&LOCAL) ? local(tvar, (set & LOCAL_COPY) ? TRUE : FALSE)
633 
		: global(tvar);
634 
	set &= ~(LOCAL|LOCAL_COPY);
635 
 
636 
	vpbase = (vp->flag & ARRAY) ? global(arrayname(var)) : vp;
637 
 
638 
	/* only allow export flag to be set.  at&t ksh allows any attribute to
639 
	 * be changed, which means it can be truncated or modified
640 
	 * (-L/-R/-Z/-i).
641 
	 */
642 
	if ((vpbase->flag&RDONLY)
643 
	    && (val || clr || (set & ~EXPORT)))
644 
		/* XXX check calls - is error here ok by POSIX? */
645 
		errorf("%s: is read only", tvar);
646 
	if (val)
647 
		afree(tvar, ATEMP);
648 
 
649 
	/* most calls are with set/clr == 0 */
650 
	if (set | clr) {
651 
		int ok = 1;
652 
		/* XXX if x[0] isn't set, there will be problems: need to have
653 
		 * one copy of attributes for arrays...
654 
		 */
655 
		for (t = vpbase; t; t = t->u.array) {
656 
			int fake_assign;
657 
			char UNINITIALIZED(*s);
658 
			char UNINITIALIZED(*free_me);
659 
 
660 
			fake_assign = (t->flag & ISSET) && (!val || t != vp)
661 
				      && ((set & (UCASEV_AL|LCASEV|LJUST|RJUST|ZEROFIL))
662 
					  || ((t->flag & INTEGER) && (clr & INTEGER))
663 
					  || (!(t->flag & INTEGER) && (set & INTEGER)));
664 
			if (fake_assign) {
665 
				if (t->flag & INTEGER) {
666 
					s = str_val(t);
667 
					free_me = (char *) 0;
668 
				} else {
669 
					s = t->val.s + t->type;
670 
					free_me = (t->flag & ALLOC) ? t->val.s
671 
								  : (char *) 0;
672 
				}
673 
				t->flag &= ~ALLOC;
674 
			}
675 
			if (!(t->flag & INTEGER) && (set & INTEGER)) {
676 
				t->type = 0;
677 
				t->flag &= ~ALLOC;
678 
			}
679 
			t->flag = (t->flag | set) & ~clr;
680 
			/* Don't change base if assignment is to be done,
681 
			 * in case assignment fails.
682 
			 */
683 
			if ((set & INTEGER) && base > 0 && (!val || t != vp))
684 
				t->type = base;
685 
			if (set & (LJUST|RJUST|ZEROFIL))
686 
				t->u2.field = field;
687 
			if (fake_assign) {
688 
				if (!setstr(t, s, KSH_RETURN_ERROR)) {
689 
					/* Somewhat arbitrary action here:
690 
					 * zap contents of varibale, but keep
691 
					 * the flag settings.
692 
					 */
693 
					ok = 0;
694 
					if (t->flag & INTEGER)
695 
						t->flag &= ~ISSET;
696 
					else {
697 
						if (t->flag & ALLOC)
698 
							afree((void*) t->val.s,
699 
							      t->areap);
700 
						t->flag &= ~(ISSET|ALLOC);
701 
						t->type = 0;
702 
					}
703 
				}
704 
				if (free_me)
705 
					afree((void *) free_me, t->areap);
706 
			}
707 
		}
708 
		if (!ok)
709 
		    errorf(null);
710 
	}
711 
 
712 
	if (val != NULL) {
713 
		if (vp->flag&INTEGER) {
714 
			/* do not zero base before assignment */
715 
			setstr(vp, val, KSH_UNWIND_ERROR);
716 
			/* Done after assignment to override default */
717 
			if (base > 0)
718 
				vp->type = base;
719 
		} else
720 
			/* setstr can't fail (readonly check already done) */
721 
			setstr(vp, val, KSH_RETURN_ERROR);
722 
	}
723 
 
724 
	/* only x[0] is ever exported, so use vpbase */
725 
	if ((vpbase->flag&EXPORT) && !(vpbase->flag&INTEGER)
726 
	    && vpbase->type == 0)
727 
		export(vpbase, (vpbase->flag&ISSET) ? vpbase->val.s : null);
728 
 
729 
	return vp;
730 
}
731 
 
732 
/* Unset a variable.  array_ref is set if there was an array reference in
733 
 * the name lookup (eg, x[2]).
734 
 */
735 
void
736 
unset(vp, array_ref)
737 
	register struct tbl *vp;
738 
	int array_ref;
739 
{
740 
	if (vp->flag & ALLOC)
741 
		afree((void*)vp->val.s, vp->areap);
742 
	if ((vp->flag & ARRAY) && !array_ref) {
743 
		struct tbl *a, *tmp;
744 
 
745 
		/* Free up entire array */
746 
		for (a = vp->u.array; a; ) {
747 
			tmp = a;
748 
			a = a->u.array;
749 
			if (tmp->flag & ALLOC)
750 
				afree((void *) tmp->val.s, tmp->areap);
751 
			afree(tmp, tmp->areap);
752 
		}
753 
		vp->u.array = (struct tbl *) 0;
754 
	}
755 
	/* If foo[0] is being unset, the remainder of the array is kept... */
756 
	vp->flag &= SPECIAL | (array_ref ? ARRAY|DEFINED : 0);
757 
	if (vp->flag & SPECIAL)
758 
		unsetspec(vp);	/* responsible for `unspecial'ing var */
759 
}
760 
 
761 
/* return a pointer to the first char past a legal variable name (returns the
762 
 * argument if there is no legal name, returns * a pointer to the terminating
763 
 * null if whole string is legal).
764 
 */
765 
char *
766 
skip_varname(s, aok)
767 
	const char *s;
768 
	int aok;
769 
{
770 
	int alen;
771 
 
772 
	if (s && letter(*s)) {
773 
		while (*++s && letnum(*s))
774 
			;
775 
		if (aok && *s == '[' && (alen = array_ref_len(s)))
776 
			s += alen;
777 
	}
778 
	return (char *) s;
779 
}
780 
 
781 
/* Return a pointer to the first character past any legal variable name.  */
782 
char *
783 
skip_wdvarname(s, aok)
784 
	const char *s;
785 
	int aok;	/* skip array de-reference? */
786 
{
787 
	if (s[0] == CHAR && letter(s[1])) {
788 
		do
789 
			s += 2;
790 
		while (s[0] == CHAR && letnum(s[1]));
791 
		if (aok && s[0] == CHAR && s[1] == '[') {
792 
			/* skip possible array de-reference */
793 
			const char *p = s;
794 
			char c;
795 
			int depth = 0;
796 
 
797 
			while (1) {
798 
				if (p[0] != CHAR)
799 
					break;
800 
				c = p[1];
801 
				p += 2;
802 
				if (c == '[')
803 
					depth++;
804 
				else if (c == ']' && --depth == 0) {
805 
					s = p;
806 
					break;
807 
				}
808 
			}
809 
		}
810 
	}
811 
	return (char *) s;
812 
}
813 
 
814 
/* Check if coded string s is a variable name */
815 
int
816 
is_wdvarname(s, aok)
817 
	const char *s;
818 
	int aok;
819 
{
820 
	char *p = skip_wdvarname(s, aok);
821 
 
822 
	return p != s && p[0] == EOS;
823 
}
824 
 
825 
/* Check if coded string s is a variable assignment */
826 
int
827 
is_wdvarassign(s)
828 
	const char *s;
829 
{
830 
	char *p = skip_wdvarname(s, TRUE);
831 
 
832 
	return p != s && p[0] == CHAR && p[1] == '=';
833 
}
834 
 
835 
/*
836 
 * Make the exported environment from the exported names in the dictionary.
837 
 */
838 
char **
839 
makenv()
840 
{
841 
	struct block *l = e->loc;
842 
	XPtrV env;
843 
	register struct tbl *vp, **vpp;
844 
	register int i;
845 
 
846 
	XPinit(env, 64);
847 
	for (l = e->loc; l != NULL; l = l->next)
848 
		for (vpp = l->vars.tbls, i = l->vars.size; --i >= 0; )
849 
			if ((vp = *vpp++) != NULL
850 
			    && (vp->flag&(ISSET|EXPORT)) == (ISSET|EXPORT)) {
851 
				register struct block *l2;
852 
				register struct tbl *vp2;
853 
				unsigned h = hash(vp->name);
854 
 
855 
				/* unexport any redefined instances */
856 
				for (l2 = l->next; l2 != NULL; l2 = l2->next) {
857 
					vp2 = tsearch(&l2->vars, vp->name, h);
858 
					if (vp2 != NULL)
859 
						vp2->flag &= ~EXPORT;
860 
				}
861 
				if ((vp->flag&INTEGER)) {
862 
					/* integer to string */
863 
					char *val;
864 
					val = str_val(vp);
865 
					vp->flag &= ~(INTEGER|RDONLY);
866 
					/* setstr can't fail here */
867 
					setstr(vp, val, KSH_RETURN_ERROR);
868 
				}
869 
				XPput(env, vp->val.s);
870 
			}
871 
	XPput(env, NULL);
872 
	return (char **) XPclose(env);
873 
}
874 
 
875 
/*
876 
 * Called after a fork in parent to bump the random number generator.
877 
 * Done to ensure children will not get the same random number sequence
878 
 * if the parent doesn't use $RANDOM.
879 
 */
880 
void
881 
change_random()
882 
{
883 
    rand();
884 
}
885 
 
886 
/*
887 
 * handle special variables with side effects - PATH, SECONDS.
888 
 */
889 
 
890 
/* Test if name is a special parameter */
891 
static int
892 
special(name)
893 
	register const char * name;
894 
{
895 
	register struct tbl *tp;
896 
 
897 
	tp = tsearch(&specials, name, hash(name));
898 
	return tp && (tp->flag & ISSET) ? tp->type : V_NONE;
899 
}
900 
 
901 
/* Make a variable non-special */
902 
static void
903 
unspecial(name)
904 
	register const char * name;
905 
{
906 
	register struct tbl *tp;
907 
 
908 
	tp = tsearch(&specials, name, hash(name));
909 
	if (tp)
910 
		tdelete(tp);
911 
}
912 
 
913 
#ifdef KSH
914 
static	time_t	seconds;		/* time SECONDS last set */
915 
#endif /* KSH */
916 
static	int	user_lineno;		/* what user set $LINENO to */
917 
 
918 
static void
919 
getspec(vp)
920 
	register struct tbl *vp;
921 
{
922 
	switch (special(vp->name)) {
923 
#ifdef KSH
924 
	  case V_SECONDS:
925 
		vp->flag &= ~SPECIAL;
926 
		/* On start up the value of SECONDS is used before seconds
927 
		 * has been set - don't do anything in this case
928 
		 * (see initcoms[] in main.c).
929 
		 */
930 
		if (vp->flag & ISSET)
931 
			setint(vp, (long) (time((time_t *)0) - seconds));
932 
		vp->flag |= SPECIAL;
933 
		break;
934 
	  case V_RANDOM:
935 
		vp->flag &= ~SPECIAL;
936 
		setint(vp, (long) (rand() & 0x7fff));
937 
		vp->flag |= SPECIAL;
938 
		break;
939 
#endif /* KSH */
940 
#ifdef HISTORY
941 
	  case V_HISTSIZE:
942 
		vp->flag &= ~SPECIAL;
943 
		setint(vp, (long) histsize);
944 
		vp->flag |= SPECIAL;
945 
		break;
946 
#endif /* HISTORY */
947 
	  case V_OPTIND:
948 
		vp->flag &= ~SPECIAL;
949 
		setint(vp, (long) user_opt.uoptind);
950 
		vp->flag |= SPECIAL;
951 
		break;
952 
	  case V_LINENO:
953 
		vp->flag &= ~SPECIAL;
954 
		setint(vp, (long) current_lineno + user_lineno);
955 
		vp->flag |= SPECIAL;
956 
		break;
957 
	}
958 
}
959 
 
960 
static void
961 
setspec(vp)
962 
	register struct tbl *vp;
963 
{
964 
	char *s;
965 
 
966 
	switch (special(vp->name)) {
967 
	  case V_PATH:
968 
		if (path)
969 
			afree(path, APERM);
970 
		path = str_save(str_val(vp), APERM);
971 
		flushcom(1);	/* clear tracked aliases */
972 
		break;
973 
	  case V_IFS:
974 
		setctypes(s = str_val(vp), C_IFS);
975 
		ifs0 = *s;
976 
		break;
977 
	  case V_OPTIND:
978 
		vp->flag &= ~SPECIAL;
979 
		getopts_reset((int) intval(vp));
980 
		vp->flag |= SPECIAL;
981 
		break;
982 
	  case V_POSIXLY_CORRECT:
983 
		change_flag(FPOSIX, OF_SPECIAL, 1);
984 
		break;
985 
	  case V_TMPDIR:
986 
		if (tmpdir) {
987 
			afree(tmpdir, APERM);
988 
			tmpdir = (char *) 0;
989 
		}
990 
		/* Use tmpdir iff it is an absolute path, is writable and
991 
		 * searchable and is a directory...
992 
		 */
993 
		{
994 
			struct stat statb;
995 
			s = str_val(vp);
996 
			if (ISABSPATH(s) && eaccess(s, W_OK|X_OK) == 0
997 
			    && stat(s, &statb) == 0 && S_ISDIR(statb.st_mode))
998 
				tmpdir = str_save(s, APERM);
999 
		}
1000 
		break;
1001 
#ifdef HISTORY
1002 
	  case V_HISTSIZE:
1003 
		vp->flag &= ~SPECIAL;
1004 
		sethistsize((int) intval(vp));
1005 
		vp->flag |= SPECIAL;
1006 
		break;
1007 
	  case V_HISTFILE:
1008 
		sethistfile(str_val(vp));
1009 
		break;
1010 
#endif /* HISTORY */
1011 
#ifdef EDIT
1012 
	  case V_VISUAL:
1013 
		set_editmode(str_val(vp));
1014 
		break;
1015 
	  case V_EDITOR:
1016 
		if (!(global("VISUAL")->flag & ISSET))
1017 
			set_editmode(str_val(vp));
1018 
		break;
1019 
	  case V_COLUMNS:
1020 
		if ((x_cols = intval(vp)) <= MIN_COLS)
1021 
			x_cols = MIN_COLS;
1022 
		break;
1023 
#endif /* EDIT */
1024 
#ifdef KSH
1025 
	  case V_MAIL:
1026 
		mbset(str_val(vp));
1027 
		break;
1028 
	  case V_MAILPATH:
1029 
		mpset(str_val(vp));
1030 
		break;
1031 
	  case V_MAILCHECK:
1032 
		vp->flag &= ~SPECIAL;
1033 
		mcset(intval(vp));
1034 
		vp->flag |= SPECIAL;
1035 
		break;
1036 
	  case V_RANDOM:
1037 
		vp->flag &= ~SPECIAL;
1038 
		srand((unsigned int)intval(vp));
1039 
		vp->flag |= SPECIAL;
1040 
		break;
1041 
	  case V_SECONDS:
1042 
		vp->flag &= ~SPECIAL;
1043 
		seconds = time((time_t*) 0) - intval(vp);
1044 
		vp->flag |= SPECIAL;
1045 
		break;
1046 
	  case V_TMOUT:
1047 
		/* at&t ksh seems to do this (only listen if integer) */
1048 
		if (vp->flag & INTEGER)
1049 
			ksh_tmout = vp->val.i >= 0 ? vp->val.i : 0;
1050 
		break;
1051 
#endif /* KSH */
1052 
	  case V_LINENO:
1053 
		vp->flag &= ~SPECIAL;
1054 
		/* The -1 is because line numbering starts at 1. */
1055 
		user_lineno = (unsigned int) intval(vp) - current_lineno - 1;
1056 
		vp->flag |= SPECIAL;
1057 
		break;
1058 
	}
1059 
}
1060 
 
1061 
static void
1062 
unsetspec(vp)
1063 
	register struct tbl *vp;
1064 
{
1065 
	switch (special(vp->name)) {
1066 
	  case V_PATH:
1067 
		if (path)
1068 
			afree(path, APERM);
1069 
		path = str_save(def_path, APERM);
1070 
		flushcom(1);	/* clear tracked aliases */
1071 
		break;
1072 
	  case V_IFS:
1073 
		setctypes(" \t\n", C_IFS);
1074 
		ifs0 = ' ';
1075 
		break;
1076 
	  case V_TMPDIR:
1077 
		/* should not become unspecial */
1078 
		if (tmpdir) {
1079 
			afree(tmpdir, APERM);
1080 
			tmpdir = (char *) 0;
1081 
		}
1082 
		break;
1083 
#ifdef KSH
1084 
	  case V_MAIL:
1085 
		mbset((char *) 0);
1086 
		break;
1087 
	  case V_MAILPATH:
1088 
		mpset((char *) 0);
1089 
		break;
1090 
#endif /* KSH */
1091 
 
1092 
	  case V_LINENO:
1093 
#ifdef KSH
1094 
	  case V_MAILCHECK:	/* at&t ksh leaves previous value in place */
1095 
	  case V_RANDOM:
1096 
	  case V_SECONDS:
1097 
	  case V_TMOUT:		/* at&t ksh leaves previous value in place */
1098 
#endif /* KSH */
1099 
		unspecial(vp->name);
1100 
		break;
1101 
 
1102 
	  /* at&t ksh man page says OPTIND, OPTARG and _ lose special meaning,
1103 
	   * but OPTARG does not (still set by getopts) and _ is also still
1104 
	   * set in various places.
1105 
	   * Don't know what at&t does for:
1106 
	   *		MAIL, MAILPATH, HISTSIZE, HISTFILE,
1107 
	   * Unsetting these in at&t ksh does not loose the `specialness':
1108 
	   *    no effect: IFS, COLUMNS, PATH, TMPDIR,
1109 
	   *		VISUAL, EDITOR,
1110 
	   * pdkshisms: no effect:
1111 
	   *		POSIXLY_CORRECT (use set +o posix instead)
1112 
	   */
1113 
	}
1114 
}
1115 
 
1116 
/*
1117 
 * Search for (and possibly create) a table entry starting with
1118 
 * vp, indexed by val.
1119 
 */
1120 
static struct tbl *
1121 
arraysearch(vp, val)
1122 
	struct tbl *vp;
1123 
	int val;
1124 
{
1125 
	struct tbl *prev, *curr, *new;
1126 
 
1127 
	vp->flag |= ARRAY|DEFINED;
1128 
 
1129 
	/* The table entry is always [0] */
1130 
	if (val == 0) {
1131 
		vp->index = 0;
1132 
		return vp;
1133 
	}
1134 
	prev = vp;
1135 
	curr = vp->u.array;
1136 
	while (curr && curr->index < val) {
1137 
		prev = curr;
1138 
		curr = curr->u.array;
1139 
	}
1140 
	if (curr && curr->index == val) {
1141 
		if (curr->flag&ISSET)
1142 
			return curr;
1143 
		else
1144 
			new = curr;
1145 
	} else
1146 
		new = (struct tbl *)alloc(sizeof(struct tbl)+strlen(vp->name)+1, vp->areap);
1147 
	strcpy(new->name, vp->name);
1148 
	new->flag = vp->flag & ~(ALLOC|DEFINED|ISSET|SPECIAL);
1149 
	new->type = vp->type;
1150 
	new->areap = vp->areap;
1151 
	new->u2.field = vp->u2.field;
1152 
	new->index = val;
1153 
	if (curr != new) {		/* not reusing old array entry */
1154 
		prev->u.array = new;
1155 
		new->u.array = curr;
1156 
	}
1157 
	return new;
1158 
}
1159 
 
1160 
/* Return the length of an array reference (eg, [1+2]) - cp is assumed
1161 
 * to point to the open bracket.  Returns 0 if there is no matching closing
1162 
 * bracket.
1163 
 */
1164 
int
1165 
array_ref_len(cp)
1166 
	const char *cp;
1167 
{
1168 
	const char *s = cp;
1169 
	int c;
1170 
	int depth = 0;
1171 
 
1172 
	while ((c = *s++) && (c != ']' || --depth))
1173 
		if (c == '[')
1174 
			depth++;
1175 
	if (!c)
1176 
		return 0;
1177 
	return s - cp;
1178 
}
1179 
 
1180 
/*
1181 
 * Make a copy of the base of an array name
1182 
 */
1183 
char *
1184 
arrayname(str)
1185 
	const char *str;
1186 
{
1187 
	const char *p;
1188 
 
1189 
	if ((p = strchr(str, '[')) == 0)
1190 
		/* Shouldn't happen, but why worry? */
1191 
		return (char *) str;
1192 
 
1193 
	return str_nsave(str, p - str, ATEMP);
1194 
}
1195 
 
1196 
/* Set (or overwrite, if !reset) the array variable var to the values in vals.
1197 
 */
1198 
void
1199 
set_array(var, reset, vals)
1200 
	const char *var;
1201 
	int reset;
1202 
	char **vals;
1203 
{
1204 
	struct tbl *vp, *vq;
1205 
	int i;
1206 
 
1207 
	/* to get local array, use "typeset foo; set -A foo" */
1208 
	vp = global(var);
1209 
 
1210 
	/* Note: at&t ksh allows set -A but not set +A of a read-only var */
1211 
	if ((vp->flag&RDONLY))
1212 
		errorf("%s: is read only", var);
1213 
	/* This code is quite non-optimal */
1214 
	if (reset > 0)
1215 
		/* trash existing values and attributes */
1216 
		unset(vp, 0);
1217 
	/* todo: would be nice for assignment to completely succeed or
1218 
	 * completely fail.  Only really effects integer arrays:
1219 
	 * evaluation of some of vals[] may fail...
1220 
	 */
1221 
	for (i = 0; vals[i]; i++) {
1222 
		vq = arraysearch(vp, i);
1223 
		/* would be nice to deal with errors here... (see above) */
1224 
		setstr(vq, vals[i], KSH_RETURN_ERROR);
1225 
	}
1226 
}