1 /* $Header: consarg.c,v 3.0.1.1 89/11/11 04:14:30 lwall Locked $
3 * Copyright (c) 1989, Larry Wall
5 * You may distribute under the terms of the GNU General Public License
6 * as specified in the README file that comes with the perl 3.0 kit.
9 * Revision 3.0.1.1 89/11/11 04:14:30 lwall
10 * patch2: '-' x 26 made warnings about undefined value
11 * patch2: eval with no args caused strangeness
12 * patch2: local(@foo) didn't work, but local(@foo,$bar) did
14 * Revision 3.0 89/10/18 15:10:30 lwall
21 static int nothing_in_common();
22 static int arg_common();
23 static int spat_common();
26 make_split(stab,arg,limarg)
33 if (arg->arg_type != O_MATCH) {
34 Newz(201,spat,1,SPAT);
35 spat->spat_next = curstash->tbl_spatroot; /* link into spat list */
36 curstash->tbl_spatroot = spat;
38 spat->spat_runtime = arg;
39 arg = make_match(O_MATCH,stab2arg(A_STAB,defstab),spat);
44 if (limarg->arg_type == O_ITEM) {
45 Copy(limarg+1,arg+3,1,ARG);
46 limarg[1].arg_type = A_NULL;
50 arg[3].arg_type = A_EXPR;
51 arg[3].arg_ptr.arg_arg = limarg;
55 arg[3].arg_type = A_NULL;
56 arg->arg_type = O_SPLIT;
57 spat = arg[2].arg_ptr.arg_spat;
58 spat->spat_repl = stab2arg(A_STAB,aadd(stab));
59 if (spat->spat_short) { /* exact match can bypass regexec() */
60 if (!((spat->spat_flags & SPAT_SCANFIRST) &&
61 (spat->spat_flags & SPAT_ALL) )) {
62 str_free(spat->spat_short);
63 spat->spat_short = Nullstr;
70 mod_match(type,left,pat)
78 if ((pat->arg_type == O_MATCH ||
79 pat->arg_type == O_SUBST ||
80 pat->arg_type == O_TRANS ||
81 pat->arg_type == O_SPLIT
83 pat[1].arg_ptr.arg_stab == defstab ) {
84 switch (pat->arg_type) {
86 newarg = make_op(type == O_MATCH ? O_MATCH : O_NMATCH,
88 left,Nullarg,Nullarg);
91 newarg = l(make_op(type == O_MATCH ? O_SUBST : O_NSUBST,
93 left,Nullarg,Nullarg));
96 newarg = l(make_op(type == O_MATCH ? O_TRANS : O_NTRANS,
98 left,Nullarg,Nullarg));
101 newarg = make_op(type == O_MATCH ? O_SPLIT : O_SPLIT,
103 left,Nullarg,Nullarg);
106 if (pat->arg_len >= 2) {
107 newarg[2].arg_type = pat[2].arg_type;
108 newarg[2].arg_ptr = pat[2].arg_ptr;
109 newarg[2].arg_flags = pat[2].arg_flags;
110 if (pat->arg_len >= 3) {
111 newarg[3].arg_type = pat[3].arg_type;
112 newarg[3].arg_ptr = pat[3].arg_ptr;
113 newarg[3].arg_flags = pat[3].arg_flags;
119 Newz(202,spat,1,SPAT);
120 spat->spat_next = curstash->tbl_spatroot; /* link into spat list */
121 curstash->tbl_spatroot = spat;
123 spat->spat_runtime = pat;
124 newarg = make_op(type,2,left,Nullarg,Nullarg);
125 newarg[2].arg_type = A_SPAT | A_DONT;
126 newarg[2].arg_ptr.arg_spat = spat;
133 make_op(type,newlen,arg1,arg2,arg3)
143 extern ARG *arg4; /* should be normal arguments, really */
146 arg = op_new(newlen);
147 arg->arg_type = type;
148 doarg = opargs[type];
150 if (chld->arg_type == O_ITEM &&
151 (hoistable[chld[1].arg_type] || chld[1].arg_type == A_LVAL ||
152 (chld[1].arg_type == A_LEXPR &&
153 (chld[1].arg_ptr.arg_arg->arg_type == O_LIST ||
154 chld[1].arg_ptr.arg_arg->arg_type == O_ARRAY ||
155 chld[1].arg_ptr.arg_arg->arg_type == O_HASH ))))
157 arg[1].arg_type = chld[1].arg_type;
158 arg[1].arg_ptr = chld[1].arg_ptr;
159 arg[1].arg_flags |= chld[1].arg_flags;
160 arg[1].arg_len = chld[1].arg_len;
164 arg[1].arg_type = A_EXPR;
165 arg[1].arg_ptr.arg_arg = chld;
168 arg[1].arg_type |= A_DONT;
170 arg[1].arg_flags |= AF_ARYOK;
174 if (chld->arg_type == O_ITEM &&
175 (hoistable[chld[1].arg_type] ||
177 ((chld[1].arg_type == A_READ && !(arg[1].arg_type & A_DONT))
179 (chld[1].arg_type == A_INDREAD && !(arg[1].arg_type & A_DONT))
181 (chld[1].arg_type == A_GLOB && !(arg[1].arg_type & A_DONT))
183 arg[2].arg_type = chld[1].arg_type;
184 arg[2].arg_ptr = chld[1].arg_ptr;
185 arg[2].arg_len = chld[1].arg_len;
189 arg[2].arg_type = A_EXPR;
190 arg[2].arg_ptr.arg_arg = chld;
193 arg[2].arg_type |= A_DONT;
195 arg[2].arg_flags |= AF_ARYOK;
199 if (chld->arg_type == O_ITEM && hoistable[chld[1].arg_type]) {
200 arg[3].arg_type = chld[1].arg_type;
201 arg[3].arg_ptr = chld[1].arg_ptr;
202 arg[3].arg_len = chld[1].arg_len;
206 arg[3].arg_type = A_EXPR;
207 arg[3].arg_ptr.arg_arg = chld;
210 arg[3].arg_type |= A_DONT;
212 arg[3].arg_flags |= AF_ARYOK;
214 if (newlen >= 4 && (chld = arg4)) {
215 if (chld->arg_type == O_ITEM && hoistable[chld[1].arg_type]) {
216 arg[4].arg_type = chld[1].arg_type;
217 arg[4].arg_ptr = chld[1].arg_ptr;
218 arg[4].arg_len = chld[1].arg_len;
222 arg[4].arg_type = A_EXPR;
223 arg[4].arg_ptr.arg_arg = chld;
226 if (newlen >= 5 && (chld = arg5)) {
227 if (chld->arg_type == O_ITEM && hoistable[chld[1].arg_type]) {
228 arg[5].arg_type = chld[1].arg_type;
229 arg[5].arg_ptr = chld[1].arg_ptr;
230 arg[5].arg_len = chld[1].arg_len;
234 arg[5].arg_type = A_EXPR;
235 arg[5].arg_ptr.arg_arg = chld;
240 fprintf(stderr,"%lx <= make_op(%s",arg,opname[arg->arg_type]);
242 fprintf(stderr,",%s=%lx",
243 argname[arg[1].arg_type&A_MASK],arg[1].arg_ptr.arg_arg);
245 fprintf(stderr,",%s=%lx",
246 argname[arg[2].arg_type&A_MASK],arg[2].arg_ptr.arg_arg);
248 fprintf(stderr,",%s=%lx",
249 argname[arg[3].arg_type&A_MASK],arg[3].arg_ptr.arg_arg);
251 fprintf(stderr,",%s=%lx",
252 argname[arg[4].arg_type&A_MASK],arg[4].arg_ptr.arg_arg);
254 fprintf(stderr,",%s=%lx",
255 argname[arg[5].arg_type&A_MASK],arg[5].arg_ptr.arg_arg);
256 fprintf(stderr,")\n");
259 evalstatic(arg); /* see if we can consolidate anything */
270 double value; /* must not be register */
273 unsigned long tmplong;
275 double exp(), log(), sqrt(), modf();
277 double sin(), cos(), atan2(), pow();
279 if (!arg || !arg->arg_len)
282 if ((arg[1].arg_type == A_SINGLE || arg->arg_type == O_AELEM) &&
283 (arg->arg_len == 1 || arg[2].arg_type == A_SINGLE) ) {
285 s1 = arg[1].arg_ptr.arg_str;
286 if (arg->arg_len > 1)
287 s2 = arg[2].arg_ptr.arg_str;
290 switch (arg->arg_type) {
292 i = (int)str_gnum(s2);
293 if (i < 32767 && i >= 0) {
294 arg->arg_type = O_ITEM;
296 arg[1].arg_type = A_ARYSTAB; /* $abc[123] is hoistable now */
298 arg[1].arg_ptr = arg[1].arg_ptr; /* get stab pointer */
304 str = Nullstr; /* can't be evaluated yet */
311 i = (int)str_gnum(s2);
317 value = str_gnum(s1);
318 str_numset(str,value * str_gnum(s2));
321 value = str_gnum(s2);
323 yyerror("Illegal division by constant zero");
325 str_numset(str,str_gnum(s1) / value);
328 tmplong = (long)str_gnum(s2);
330 yyerror("Illegal modulus of constant zero");
333 tmp2 = (long)str_gnum(s1);
336 str_numset(str,(double)(tmp2 % tmplong));
338 str_numset(str,(double)(tmplong - (-tmp2 % tmplong)));
344 value = str_gnum(s1);
345 str_numset(str,value + str_gnum(s2));
348 value = str_gnum(s1);
349 str_numset(str,value - str_gnum(s2));
352 value = str_gnum(s1);
353 i = (int)str_gnum(s2);
355 str_numset(str,(double)(((long)value) << i));
359 value = str_gnum(s1);
360 i = (int)str_gnum(s2);
362 str_numset(str,(double)(((long)value) >> i));
366 value = str_gnum(s1);
367 str_numset(str,(value < str_gnum(s2)) ? 1.0 : 0.0);
370 value = str_gnum(s1);
371 str_numset(str,(value > str_gnum(s2)) ? 1.0 : 0.0);
374 value = str_gnum(s1);
375 str_numset(str,(value <= str_gnum(s2)) ? 1.0 : 0.0);
378 value = str_gnum(s1);
379 str_numset(str,(value >= str_gnum(s2)) ? 1.0 : 0.0);
383 if ((!s1->str_nok && !looks_like_number(s1)) ||
384 (!s2->str_nok && !looks_like_number(s2)) )
385 warn("Possible use of == on string value");
387 value = str_gnum(s1);
388 str_numset(str,(value == str_gnum(s2)) ? 1.0 : 0.0);
391 value = str_gnum(s1);
392 str_numset(str,(value != str_gnum(s2)) ? 1.0 : 0.0);
395 value = str_gnum(s1);
397 str_numset(str,(double)(((long)value) & ((long)str_gnum(s2))));
401 value = str_gnum(s1);
403 str_numset(str,(double)(((long)value) ^ ((long)str_gnum(s2))));
407 value = str_gnum(s1);
409 str_numset(str,(double)(((long)value) | ((long)str_gnum(s2))));
425 if ((arg[3].arg_type & A_MASK) != A_SINGLE) {
433 str_sset(str,arg[3].arg_ptr.arg_str);
434 str_free(arg[3].arg_ptr.arg_str);
438 str_numset(str,(double)(-str_gnum(s1)));
441 str_numset(str,(double)(!str_true(s1)));
445 str_numset(str,(double)(~(long)str_gnum(s1)));
449 str_numset(str,sin(str_gnum(s1)));
452 str_numset(str,cos(str_gnum(s1)));
455 value = str_gnum(s1);
456 str_numset(str,atan2(value, str_gnum(s2)));
459 value = str_gnum(s1);
460 str_numset(str,pow(value, str_gnum(s2)));
463 str_numset(str, (double)str_len(s1));
466 str_numset(str,(double)(str_cmp(s1,s2) < 0));
469 str_numset(str,(double)(str_cmp(s1,s2) > 0));
472 str_numset(str,(double)(str_cmp(s1,s2) <= 0));
475 str_numset(str,(double)(str_cmp(s1,s2) >= 0));
478 str_numset(str,(double)(str_eq(s1,s2)));
481 str_numset(str,(double)(!str_eq(s1,s2)));
486 str_set(str,crypt(tmps,str_get(s2)));
489 "The crypt() function is unimplemented due to excessive paranoia.");
493 str_numset(str,exp(str_gnum(s1)));
496 str_numset(str,log(str_gnum(s1)));
499 str_numset(str,sqrt(str_gnum(s1)));
502 value = str_gnum(s1);
504 (void)modf(value,&value);
506 (void)modf(-value,&value);
509 str_numset(str,value);
513 str_numset(str,(double)(*str_get(s1)));
521 str_numset(str,(double)(zapc));
527 arg->arg_type = O_ITEM; /* note arg1 type is already SINGLE */
530 arg[1].arg_ptr.arg_str = str;
545 i = arg[1].arg_type & A_MASK;
547 arg->arg_flags |= AF_COMMON; /* assume something in common */
548 /* which forces us to copy things */
551 arg[1].arg_type = A_LARYLEN;
554 if (i == A_ARYSTAB) {
555 arg[1].arg_type = A_LARYSTAB;
559 /* see if it's an array reference */
561 if (i == A_EXPR || i == A_LEXPR) {
562 arg1 = arg[1].arg_ptr.arg_arg;
564 if (arg1->arg_type == O_LIST || arg1->arg_type == O_ITEM) {
566 if (arg->arg_len > 1) {
568 arg2 = arg[2].arg_ptr.arg_arg;
569 if (nothing_in_common(arg1,arg2))
570 arg->arg_flags &= ~AF_COMMON;
571 if (arg->arg_type == O_ASSIGN) {
572 if (arg1->arg_flags & AF_LOCAL)
573 arg->arg_flags |= AF_LOCAL;
574 arg[1].arg_flags |= AF_ARYOK;
575 arg[2].arg_flags |= AF_ARYOK;
578 else if (arg->arg_type != O_CHOP)
579 arg->arg_type = O_ASSIGN; /* possible local(); */
580 for (i = arg1->arg_len; i >= 1; i--) {
581 switch (arg1[i].arg_type) {
582 case A_STAR: case A_LSTAR:
583 arg1[i].arg_type = A_LSTAR;
585 case A_STAB: case A_LVAL:
586 arg1[i].arg_type = A_LVAL;
588 case A_ARYLEN: case A_LARYLEN:
589 arg1[i].arg_type = A_LARYLEN;
591 case A_ARYSTAB: case A_LARYSTAB:
592 arg1[i].arg_type = A_LARYSTAB;
594 case A_EXPR: case A_LEXPR:
595 arg1[i].arg_type = A_LEXPR;
596 switch(arg1[i].arg_ptr.arg_arg->arg_type) {
597 case O_ARRAY: case O_LARRAY:
598 arg1[i].arg_ptr.arg_arg->arg_type = O_LARRAY;
601 case O_AELEM: case O_LAELEM:
602 arg1[i].arg_ptr.arg_arg->arg_type = O_LAELEM;
604 case O_HASH: case O_LHASH:
605 arg1[i].arg_ptr.arg_arg->arg_type = O_LHASH;
608 case O_HELEM: case O_LHELEM:
609 arg1[i].arg_ptr.arg_arg->arg_type = O_LHELEM;
611 case O_ASLICE: case O_LASLICE:
612 arg1[i].arg_ptr.arg_arg->arg_type = O_LASLICE;
614 case O_HSLICE: case O_LHSLICE:
615 arg1[i].arg_ptr.arg_arg->arg_type = O_LHSLICE;
623 (void)sprintf(tokenbuf, "Illegal item (%s) as lvalue",
624 argname[arg1[i].arg_type&A_MASK]);
628 if (arg->arg_len > 1) {
629 if (arg2->arg_type == O_SPLIT && !arg2[3].arg_type && !arghog) {
630 arg2[3].arg_type = A_SINGLE;
631 arg2[3].arg_ptr.arg_str =
632 str_nmake((double)arg1->arg_len + 1); /* limit split len*/
636 else if (arg1->arg_type == O_AELEM || arg1->arg_type == O_LAELEM)
637 arg1->arg_type = O_LAELEM;
638 else if (arg1->arg_type == O_ARRAY || arg1->arg_type == O_LARRAY) {
639 arg1->arg_type = O_LARRAY;
640 if (arg->arg_len > 1) {
642 arg2 = arg[2].arg_ptr.arg_arg;
643 if (arg2->arg_type == O_SPLIT) { /* use split's builtin =?*/
644 spat = arg2[2].arg_ptr.arg_spat;
645 if (spat->spat_repl[1].arg_ptr.arg_stab == defstab &&
646 nothing_in_common(arg1,spat->spat_repl)) {
647 spat->spat_repl[1].arg_ptr.arg_stab =
648 arg1[1].arg_ptr.arg_stab;
649 arg_free(arg1); /* recursive */
650 free_arg(arg); /* non-recursive */
651 return arg2; /* split has builtin assign */
654 else if (nothing_in_common(arg1,arg2))
655 arg->arg_flags &= ~AF_COMMON;
656 if (arg->arg_type == O_ASSIGN) {
657 arg[1].arg_flags |= AF_ARYOK;
658 arg[2].arg_flags |= AF_ARYOK;
661 else if (arg->arg_type == O_ASSIGN)
662 arg[1].arg_flags |= AF_ARYOK;
664 else if (arg1->arg_type == O_HELEM || arg1->arg_type == O_LHELEM)
665 arg1->arg_type = O_LHELEM;
666 else if (arg1->arg_type == O_HASH || arg1->arg_type == O_LHASH) {
667 arg1->arg_type = O_LHASH;
668 if (arg->arg_len > 1) {
670 arg2 = arg[2].arg_ptr.arg_arg;
671 if (nothing_in_common(arg1,arg2))
672 arg->arg_flags &= ~AF_COMMON;
673 if (arg->arg_type == O_ASSIGN) {
674 arg[1].arg_flags |= AF_ARYOK;
675 arg[2].arg_flags |= AF_ARYOK;
678 else if (arg->arg_type == O_ASSIGN)
679 arg[1].arg_flags |= AF_ARYOK;
681 else if (arg1->arg_type == O_ASLICE) {
682 arg1->arg_type = O_LASLICE;
683 if (arg->arg_type == O_ASSIGN) {
684 arg[1].arg_flags |= AF_ARYOK;
685 arg[2].arg_flags |= AF_ARYOK;
688 else if (arg1->arg_type == O_HSLICE) {
689 arg1->arg_type = O_LHSLICE;
690 if (arg->arg_type == O_ASSIGN) {
691 arg[1].arg_flags |= AF_ARYOK;
692 arg[2].arg_flags |= AF_ARYOK;
695 else if ((arg->arg_type == O_DEFINED || arg->arg_type == O_UNDEF) &&
696 (arg1->arg_type == (perldb ? O_DBSUBR : O_SUBR)) ) {
697 arg[1].arg_type |= A_DONT;
699 else if (arg1->arg_type == O_SUBSTR || arg1->arg_type == O_VEC) {
701 Renewc(arg1->arg_ptr.arg_str, 1, struct lstring, STR);
702 /* grow string struct to hold an lstring struct */
704 else if (arg1->arg_type == O_ASSIGN) {
705 if (arg->arg_type == O_CHOP)
706 arg[1].arg_flags &= ~AF_ARYOK; /* grandfather chop idiom */
709 (void)sprintf(tokenbuf,
710 "Illegal expression (%s) as lvalue",opname[arg1->arg_type]);
713 arg[1].arg_type = A_LEXPR | (arg[1].arg_type & A_DONT);
714 if (arg->arg_type == O_ASSIGN && (arg1[1].arg_flags & AF_ARYOK)) {
715 arg[1].arg_flags |= AF_ARYOK;
716 if (arg->arg_len > 1)
717 arg[2].arg_flags |= AF_ARYOK;
721 fprintf(stderr,"lval LEXPR\n");
725 if (i == A_STAR || i == A_LSTAR) {
726 arg[1].arg_type = A_LSTAR | (arg[1].arg_type & A_DONT);
730 /* not an array reference, should be a register name */
732 if (i != A_STAB && i != A_LVAL) {
733 (void)sprintf(tokenbuf,
734 "Illegal item (%s) as lvalue",argname[arg[1].arg_type&A_MASK]);
737 arg[1].arg_type = A_LVAL | (arg[1].arg_type & A_DONT);
740 fprintf(stderr,"lval LVAL\n");
750 if (type == O_DEFINED || type == O_UNDEF) {
751 if (arg->arg_type != O_ITEM)
753 if (arg->arg_type == O_ITEM) {
754 type = arg[1].arg_type & A_MASK;
755 if (type == A_EXPR || type == A_LEXPR)
756 arg[1].arg_type = A_LEXPR|A_DONT;
767 if (arg[i].arg_type != A_EXPR) { /* dehoist */
768 tmparg = make_op(O_ITEM,1,Nullarg,Nullarg,Nullarg);
770 arg[i].arg_ptr.arg_arg = tmparg;
771 arg[i].arg_type = A_EXPR;
776 addflags(i,flags,arg)
779 arg[i].arg_flags |= flags;
787 if (arg->arg_type == O_ARRAY || arg->arg_type == O_HASH)
788 return make_op(O_ITEM,1,arg,Nullarg,Nullarg);
792 /* maybe do a join on multiple array dimensions */
798 if (arg && arg->arg_type == O_COMMA) {
800 arg = make_op(O_JOIN, 2,
801 stab2arg(A_STAB,stabent(";",TRUE)),
814 register ARG *nxtnode;
820 arg->arg_type = O_LIST;
822 if (arg->arg_type != O_COMMA) {
823 if (arg->arg_type != O_ARRAY)
824 arg->arg_flags |= AF_LISTISH; /* see listish() below */
827 for (i = 2, node = arg; ; i++) {
828 if (node->arg_len < 2)
830 if (node[1].arg_type != A_EXPR)
832 node = node[1].arg_ptr.arg_arg;
833 if (node->arg_type != O_COMMA)
839 tmpstr = arg->arg_ptr.arg_str;
841 *arg = *node; /* copy everything except the STR */
843 (void)bcopy((char *)node, (char *)arg, sizeof(ARG));
845 arg->arg_ptr.arg_str = tmpstr;
850 (void)bcopy((char *)(node+2), (char *)(arg+j), sizeof(ARG));
852 arg[j].arg_flags |= AF_ARYOK;
853 --j; /* Bug in Xenix compiler */
858 (void)bcopy((char *)(node+1), (char *)(arg+1), sizeof(ARG));
863 nxtnode = node[1].arg_ptr.arg_arg;
868 arg[1].arg_flags |= AF_ARYOK;
869 arg[2].arg_flags |= AF_ARYOK;
870 arg->arg_type = O_LIST;
875 /* turn a single item into a list */
881 if (arg->arg_flags & AF_LISTISH)
882 arg = make_op(O_LIST,1,arg,Nullarg,Nullarg);
887 maybelistish(optype, arg)
891 if (optype == O_PRTF ||
892 (arg->arg_type == O_ASLICE || arg->arg_type == O_HSLICE ||
893 arg->arg_type == O_F_OR_R) )
898 /* mark list of local variables */
904 arg->arg_flags |= AF_LOCAL;
913 if (arg->arg_len == 0)
914 arg[1].arg_type = A_NULL;
916 arg[2].arg_ptr.arg_hash = curstash;
917 arg[2].arg_type = A_NULL;
925 if (arg->arg_type == O_CONCAT && arg[2].arg_type == A_READ) {
926 arg->arg_type = O_RCAT;
927 arg[2].arg_type = arg[2].arg_ptr.arg_arg[1].arg_type;
928 arg[2].arg_ptr = arg[2].arg_ptr.arg_arg[1].arg_ptr;
929 free_arg(arg[2].arg_ptr.arg_arg);
942 arg->arg_type = O_ITEM;
943 arg[1].arg_type = atype;
944 arg[1].arg_ptr.arg_stab = stab;
955 arg->arg_type = O_ITEM;
956 arg[1].arg_type = A_SINGLE;
957 arg[1].arg_ptr.arg_str = str_make(cval,0);
968 Newz(203,arg, numargs + 1, ARG);
969 arg->arg_ptr.arg_str = Str_new(21,0);
970 arg->arg_len = numargs;
978 str_free(arg->arg_ptr.arg_str);
983 make_match(type,expr,spat)
990 arg = make_op(type,2,expr,Nullarg,Nullarg);
992 arg[2].arg_type = A_SPAT|A_DONT;
993 arg[2].arg_ptr.arg_spat = spat;
996 fprintf(stderr,"make_match SPAT=%lx\n",(long)spat);
999 if (type == O_SUBST || type == O_NSUBST) {
1000 if (arg[1].arg_type != A_STAB) {
1001 yyerror("Illegal lvalue");
1003 arg[1].arg_type = A_LVAL;
1015 arg->arg_type = O_ITEM;
1016 arg[1].arg_type = A_CMD;
1017 arg[1].arg_ptr.arg_cmd = cmd;
1021 /* Check two expressions to see if there is any identifier in common */
1024 nothing_in_common(arg1,arg2)
1028 static int thisexpr = 0; /* I don't care if this wraps */
1031 if (arg_common(arg1,thisexpr,1))
1032 return 0; /* hit eval or do {} */
1033 if (arg_common(arg2,thisexpr,0))
1034 return 0; /* hit identifier again */
1038 /* Recursively descend an expression and mark any identifier or check
1039 * it to see if it was marked already.
1043 arg_common(arg,exprnum,marking)
1052 for (i = arg->arg_len; i >= 1; i--) {
1053 switch (arg[i].arg_type & A_MASK) {
1058 if (arg_common(arg[i].arg_ptr.arg_arg,exprnum,marking))
1062 return 1; /* assume hanky panky */
1070 stab_lastexpr(arg[i].arg_ptr.arg_stab) = exprnum;
1071 else if (stab_lastexpr(arg[i].arg_ptr.arg_stab) == exprnum)
1077 register char *s = arg[i].arg_ptr.arg_str->str_ptr;
1078 register char *send = s + arg[i].arg_ptr.arg_str->str_cur;
1079 register STAB *stab;
1082 if (*s == '$' && s[1]) {
1083 s = scanreg(s,send,tokenbuf);
1084 stab = stabent(tokenbuf,TRUE);
1086 stab_lastexpr(stab) = exprnum;
1087 else if (stab_lastexpr(stab) == exprnum)
1091 else if (*s == '\\' && s[1])
1098 if (spat_common(arg[i].arg_ptr.arg_spat,exprnum,marking))
1109 switch (arg->arg_type) {
1112 if ((arg[1].arg_type & A_MASK) == A_STAB)
1113 (void)aadd(arg[1].arg_ptr.arg_stab);
1117 if ((arg[1].arg_type & A_MASK) == A_STAB)
1118 (void)hadd(arg[1].arg_ptr.arg_stab);
1129 spat_common(spat,exprnum,marking)
1130 register SPAT *spat;
1134 if (spat->spat_runtime)
1135 if (arg_common(spat->spat_runtime,exprnum,marking))
1137 if (spat->spat_repl) {
1138 if (arg_common(spat->spat_repl,exprnum,marking))