x2p/walk.c

   1 /* $RCSfile: walk.c,v $$Revision: 4.1 $$Date: 92/08/07 18:29:31 $
   2  *
   3  *    Copyright (c) 1991-2001, Larry Wall
   4  *
   5  *    You may distribute under the terms of either the GNU General Public
   6  *    License or the Artistic License, as specified in the README file.
   7  *
   8  * $Log:        walk.c,v $
   9  */
  10
  11 #include "EXTERN.h"
  12 #include "a2p.h"
  13 #include "util.h"
  14
  15 bool exitval = FALSE;
  16 bool realexit = FALSE;
  17 bool saw_getline = FALSE;
  18 bool subretnum = FALSE;
  19 bool saw_FNR = FALSE;
  20 bool saw_argv0 = FALSE;
  21 bool saw_fh = FALSE;
  22 int maxtmp = 0;
  23 char *lparen;
  24 char *rparen;
  25 char *limit;
  26 STR *subs;
  27 STR *curargs = Nullstr;
  28
  29 static void addsemi ( STR *str );
  30 static void emit_split ( STR *str, int level );
  31 static void fixtab ( STR *str, int lvl );
  32 static void numericize ( int node );
  33 static void tab ( STR *str, int lvl );
  34
  35 int prewalk ( int numit, int level, int node, int *numericptr );
  36 STR * walk ( int useval, int level, int node, int *numericptr, int minprec );
  37
  38
  39 STR *
  40 walk(int useval, int level, register int node, int *numericptr, int minprec)
  41
  42
  43
  44
  45                                 /* minimum precedence without parens */
  46 {
  47     register int len;
  48     register STR *str;
  49     register int type;
  50     register int i;
  51     register STR *tmpstr;
  52     STR *tmp2str;
  53     STR *tmp3str;
  54     char *t;
  55     char *d, *s = 0;
  56     int numarg;
  57     int numeric = FALSE;
  58     STR *fstr;
  59     int prec = P_MAX;           /* assume no parens needed */
  60
  61     if (!node) {
  62         *numericptr = 0;
  63         return str_make("");
  64     }
  65     type = ops[node].ival;
  66     len = type >> 8;
  67     type &= 255;
  68     switch (type) {
  69     case OPROG:
  70         arymax = 0;
  71         if (namelist) {
  72             while (isALPHA(*namelist)) {
  73                 for (d = tokenbuf,s=namelist;
  74                   isALPHA(*s) || isDIGIT(*s) || *s == '_';
  75                   *d++ = *s++) ;
  76                 *d = '\0';
  77                 while (*s && !isALPHA(*s)) s++;
  78                 namelist = s;
  79                 nameary[++arymax] = savestr(tokenbuf);
  80             }
  81         }
  82         if (maxfld < arymax)
  83             maxfld = arymax;
  84         opens = str_new(0);
  85         subs = str_new(0);
  86         str = walk(0,level,ops[node+1].ival,&numarg,P_MIN);
  87         if (do_split && need_entire && !absmaxfld)
  88             split_to_array = TRUE;
  89         if (do_split && split_to_array)
  90             set_array_base = TRUE;
  91         if (set_array_base) {
  92             str_cat(str,"$[ = 1;\t\t\t# set array base to 1\n");
  93         }
  94         if (fswitch && !const_FS)
  95             const_FS = fswitch;
  96         if (saw_FS > 1 || saw_RS)
  97             const_FS = 0;
  98         if (saw_ORS && need_entire)
  99             do_chop = TRUE;
 100         if (fswitch) {
 101             str_cat(str,"$FS = '");
 102             if (strchr("*+?.[]()|^$\\",fswitch))
 103                 str_cat(str,"\\");
 104             sprintf(tokenbuf,"%c",fswitch);
 105             str_cat(str,tokenbuf);
 106             str_cat(str,"';\t\t# field separator from -F switch\n");
 107         }
 108         else if (saw_FS && !const_FS) {
 109             str_cat(str,"$FS = ' ';\t\t# set field separator\n");
 110         }
 111         if (saw_OFS) {
 112             str_cat(str,"$, = ' ';\t\t# set output field separator\n");
 113         }
 114         if (saw_ORS) {
 115             str_cat(str,"$\\ = \"\\n\";\t\t# set output record separator\n");
 116         }
 117         if (saw_argv0) {
 118             str_cat(str,"$ARGV0 = $0;\t\t# remember what we ran as\n");
 119         }
 120         if (str->str_cur > 20)
 121             str_cat(str,"\n");
 122         if (ops[node+2].ival) {
 123             str_scat(str,fstr=walk(0,level,ops[node+2].ival,&numarg,P_MIN));
 124             str_free(fstr);
 125             str_cat(str,"\n\n");
 126         }
 127         fstr = walk(0,level+1,ops[node+3].ival,&numarg,P_MIN);
 128         if (*fstr->str_ptr) {
 129             if (saw_line_op)
 130                 str_cat(str,"line: ");
 131             str_cat(str,"while (<>) {\n");
 132             tab(str,++level);
 133             if (saw_FS && !const_FS)
 134                 do_chop = TRUE;
 135             if (do_chop) {
 136                 str_cat(str,"chomp;\t# strip record separator\n");
 137                 tab(str,level);
 138             }
 139             if (do_split)
 140                 emit_split(str,level);
 141             str_scat(str,fstr);
 142             str_free(fstr);
 143             fixtab(str,--level);
 144             str_cat(str,"}\n");
 145             if (saw_FNR)
 146                 str_cat(str,"continue {\n    $FNRbase = $. if eof;\n}\n");
 147         }
 148         else if (old_awk)
 149             str_cat(str,"while (<>) { }         # (no line actions)\n");
 150         if (ops[node+4].ival) {
 151             realexit = TRUE;
 152             str_cat(str,"\n");
 153             tab(str,level);
 154             str_scat(str,fstr=walk(0,level,ops[node+4].ival,&numarg,P_MIN));
 155             str_free(fstr);
 156             str_cat(str,"\n");
 157         }
 158         if (exitval)
 159             str_cat(str,"exit $ExitValue;\n");
 160         if (subs->str_ptr) {
 161             str_cat(str,"\n");
 162             str_scat(str,subs);
 163         }
 164         if (saw_getline) {
 165             for (len = 0; len < 4; len++) {
 166                 if (saw_getline & (1 << len)) {
 167                     sprintf(tokenbuf,"\nsub Getline%d {\n",len);
 168                     str_cat(str, tokenbuf);
 169                     if (len & 2) {
 170                         if (do_fancy_opens)
 171                             str_cat(str,"    &Pick('',@_);\n");
 172                         else
 173                             str_cat(str,"    ($fh) = @_;\n");
 174                     }
 175                     else {
 176                         if (saw_FNR)
 177                             str_cat(str,"    $FNRbase = $. if eof;\n");
 178                     }
 179                     if (len & 1)
 180                         str_cat(str,"    local($_);\n");
 181                     if (len & 2)
 182                         str_cat(str,
 183                           "    if ($getline_ok = (($_ = <$fh>) ne ''))");
 184                     else
 185                         str_cat(str,
 186                           "    if ($getline_ok = (($_ = <>) ne ''))");
 187                     str_cat(str, " {\n");
 188                     level += 2;
 189                     tab(str,level);
 190                     i = 0;
 191                     if (do_chop) {
 192                         i++;
 193                         str_cat(str,"chomp;\t# strip record separator\n");
 194                         tab(str,level);
 195                     }
 196                     if (do_split && !(len & 1)) {
 197                         i++;
 198                         emit_split(str,level);
 199                     }
 200                     if (!i)
 201                         str_cat(str,";\n");
 202                     fixtab(str,--level);
 203                     str_cat(str,"}\n    $_;\n}\n");
 204                     --level;
 205                 }
 206             }
 207         }
 208         if (do_fancy_opens) {
 209             str_cat(str,"\n\
 210 sub Pick {\n\
 211     local($mode,$name,$pipe) = @_;\n\
 212     $fh = $name;\n\
 213     open($name,$mode.$name.$pipe) unless $opened{$name}++;\n\
 214 }\n\
 215 ");
 216         }
 217         break;
 218     case OHUNKS:
 219         str = walk(0,level,ops[node+1].ival,&numarg,P_MIN);
 220         str_scat(str,fstr=walk(0,level,ops[node+2].ival,&numarg,P_MIN));
 221         str_free(fstr);
 222         if (len == 3) {
 223             str_scat(str,fstr=walk(0,level,ops[node+3].ival,&numarg,P_MIN));
 224             str_free(fstr);
 225         }
 226         else {
 227         }
 228         break;
 229     case ORANGE:
 230         prec = P_DOTDOT;
 231         str = walk(1,level,ops[node+1].ival,&numarg,prec+1);
 232         str_cat(str," .. ");
 233         str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,prec+1));
 234         str_free(fstr);
 235         break;
 236     case OPAT:
 237         goto def;
 238     case OREGEX:
 239         str = str_new(0);
 240         str_set(str,"/");
 241         tmpstr=walk(0,level,ops[node+1].ival,&numarg,P_MIN);
 242         /* translate \nnn to [\nnn] */
 243         for (s = tmpstr->str_ptr, d = tokenbuf; *s; s++, d++) {
 244             if (*s == '\\' && isDIGIT(s[1]) && isDIGIT(s[2]) && isDIGIT(s[3])){
 245                 *d++ = '[';
 246                 *d++ = *s++;
 247                 *d++ = *s++;
 248                 *d++ = *s++;
 249                 *d++ = *s;
 250                 *d = ']';
 251             }
 252             else
 253                 *d = *s;
 254         }
 255         *d = '\0';
 256         for (d=tokenbuf; *d; d++)
 257             *d += 128;
 258         str_cat(str,tokenbuf);
 259         str_free(tmpstr);
 260         str_cat(str,"/");
 261         break;
 262     case OHUNK:
 263         if (len == 1) {
 264             str = str_new(0);
 265             str = walk(0,level,oper1(OPRINT,0),&numarg,P_MIN);
 266             str_cat(str," if ");
 267             str_scat(str,fstr=walk(0,level,ops[node+1].ival,&numarg,P_MIN));
 268             str_free(fstr);
 269             str_cat(str,";");
 270         }
 271         else {
 272             tmpstr = walk(0,level,ops[node+1].ival,&numarg,P_MIN);
 273             if (*tmpstr->str_ptr) {
 274                 str = str_new(0);
 275                 str_set(str,"if (");
 276                 str_scat(str,tmpstr);
 277                 str_cat(str,") {\n");
 278                 tab(str,++level);
 279                 str_scat(str,fstr=walk(0,level,ops[node+2].ival,&numarg,P_MIN));
 280                 str_free(fstr);
 281                 fixtab(str,--level);
 282                 str_cat(str,"}\n");
 283                 tab(str,level);
 284             }
 285             else {
 286                 str = walk(0,level,ops[node+2].ival,&numarg,P_MIN);
 287             }
 288         }
 289         break;
 290     case OPPAREN:
 291         str = str_new(0);
 292         str_set(str,"(");
 293         str_scat(str,fstr=walk(useval != 0,level,ops[node+1].ival,&numarg,P_MIN));
 294         str_free(fstr);
 295         str_cat(str,")");
 296         break;
 297     case OPANDAND:
 298         prec = P_ANDAND;
 299         str = walk(1,level,ops[node+1].ival,&numarg,prec);
 300         str_cat(str," && ");
 301         str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,prec+1));
 302         str_free(fstr);
 303         str_scat(str,fstr=walk(1,level,ops[node+3].ival,&numarg,prec+1));
 304         str_free(fstr);
 305         break;
 306     case OPOROR:
 307         prec = P_OROR;
 308         str = walk(1,level,ops[node+1].ival,&numarg,prec);
 309         str_cat(str," || ");
 310         str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,prec+1));
 311         str_free(fstr);
 312         str_scat(str,fstr=walk(1,level,ops[node+3].ival,&numarg,prec+1));
 313         str_free(fstr);
 314         break;
 315     case OPNOT:
 316         prec = P_UNARY;
 317         str = str_new(0);
 318         str_set(str,"!");
 319         str_scat(str,fstr=walk(1,level,ops[node+1].ival,&numarg,prec));
 320         str_free(fstr);
 321         break;
 322     case OCOND:
 323         prec = P_COND;
 324         str = walk(1,level,ops[node+1].ival,&numarg,prec);
 325         str_cat(str," ? ");
 326         str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,prec+1));
 327         str_free(fstr);
 328         str_cat(str," : ");
 329         str_scat(str,fstr=walk(1,level,ops[node+3].ival,&numarg,prec+1));
 330         str_free(fstr);
 331         break;
 332     case OCPAREN:
 333         str = str_new(0);
 334         str_set(str,"(");
 335         str_scat(str,fstr=walk(useval != 0,level,ops[node+1].ival,&numarg,P_MIN));
 336         str_free(fstr);
 337         numeric |= numarg;
 338         str_cat(str,")");
 339         break;
 340     case OCANDAND:
 341         prec = P_ANDAND;
 342         str = walk(1,level,ops[node+1].ival,&numarg,prec);
 343         numeric = 1;
 344         str_cat(str," && ");
 345         str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,prec+1));
 346         str_free(fstr);
 347         str_scat(str,fstr=walk(1,level,ops[node+3].ival,&numarg,prec+1));
 348         str_free(fstr);
 349         break;
 350     case OCOROR:
 351         prec = P_OROR;
 352         str = walk(1,level,ops[node+1].ival,&numarg,prec);
 353         numeric = 1;
 354         str_cat(str," || ");
 355         str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,prec+1));
 356         str_free(fstr);
 357         str_scat(str,fstr=walk(1,level,ops[node+3].ival,&numarg,prec+1));
 358         str_free(fstr);
 359         break;
 360     case OCNOT:
 361         prec = P_UNARY;
 362         str = str_new(0);
 363         str_set(str,"!");
 364         str_scat(str,fstr=walk(1,level,ops[node+1].ival,&numarg,prec));
 365         str_free(fstr);
 366         numeric = 1;
 367         break;
 368     case ORELOP:
 369         prec = P_REL;
 370         str = walk(1,level,ops[node+2].ival,&numarg,prec+1);
 371         numeric |= numarg;
 372         tmpstr = walk(0,level,ops[node+1].ival,&numarg,P_MIN);
 373         tmp2str = walk(1,level,ops[node+3].ival,&numarg,prec+1);
 374         numeric |= numarg;
 375         if (!numeric ||
 376          (!numarg && (*tmp2str->str_ptr == '"' || *tmp2str->str_ptr == '\''))) {
 377             t = tmpstr->str_ptr;
 378             if (strEQ(t,"=="))
 379                 str_set(tmpstr,"eq");
 380             else if (strEQ(t,"!="))
 381                 str_set(tmpstr,"ne");
 382             else if (strEQ(t,"<"))
 383                 str_set(tmpstr,"lt");
 384             else if (strEQ(t,"<="))
 385                 str_set(tmpstr,"le");
 386             else if (strEQ(t,">"))
 387                 str_set(tmpstr,"gt");
 388             else if (strEQ(t,">="))
 389                 str_set(tmpstr,"ge");
 390             if (!strchr(tmpstr->str_ptr,'\'') && !strchr(tmpstr->str_ptr,'"') &&
 391               !strchr(tmp2str->str_ptr,'\'') && !strchr(tmp2str->str_ptr,'"') )
 392                 numeric |= 2;
 393         }
 394         if (numeric & 2) {
 395             if (numeric & 1)            /* numeric is very good guess */
 396                 str_cat(str," ");
 397             else
 398                 str_cat(str,"\377");
 399             numeric = 1;
 400         }
 401         else
 402             str_cat(str," ");
 403         str_scat(str,tmpstr);
 404         str_free(tmpstr);
 405         str_cat(str," ");
 406         str_scat(str,tmp2str);
 407         str_free(tmp2str);
 408         numeric = 1;
 409         break;
 410     case ORPAREN:
 411         str = str_new(0);
 412         str_set(str,"(");
 413         str_scat(str,fstr=walk(useval != 0,level,ops[node+1].ival,&numarg,P_MIN));
 414         str_free(fstr);
 415         numeric |= numarg;
 416         str_cat(str,")");
 417         break;
 418     case OMATCHOP:
 419         prec = P_MATCH;
 420         str = walk(1,level,ops[node+2].ival,&numarg,prec+1);
 421         str_cat(str," ");
 422         tmpstr = walk(0,level,ops[node+1].ival,&numarg,P_MIN);
 423         if (strEQ(tmpstr->str_ptr,"~"))
 424             str_cat(str,"=~");
 425         else {
 426             str_scat(str,tmpstr);
 427             str_free(tmpstr);
 428         }
 429         str_cat(str," ");
 430         str_scat(str,fstr=walk(1,level,ops[node+3].ival,&numarg,prec+1));
 431         str_free(fstr);
 432         numeric = 1;
 433         break;
 434     case OMPAREN:
 435         str = str_new(0);
 436         str_set(str,"(");
 437         str_scat(str,
 438           fstr=walk(useval != 0,level,ops[node+1].ival,&numarg,P_MIN));
 439         str_free(fstr);
 440         numeric |= numarg;
 441         str_cat(str,")");
 442         break;
 443     case OCONCAT:
 444         prec = P_ADD;
 445         type = ops[ops[node+1].ival].ival & 255;
 446         str = walk(1,level,ops[node+1].ival,&numarg,prec+(type != OCONCAT));
 447         str_cat(str," . ");
 448         type = ops[ops[node+2].ival].ival & 255;
 449         str_scat(str,
 450           fstr=walk(1,level,ops[node+2].ival,&numarg,prec+(type != OCONCAT)));
 451         str_free(fstr);
 452         break;
 453     case OASSIGN:
 454         prec = P_ASSIGN;
 455         str = walk(0,level,ops[node+2].ival,&numarg,prec+1);
 456         str_cat(str," ");
 457         tmpstr = walk(0,level,ops[node+1].ival,&numarg,P_MIN);
 458         str_scat(str,tmpstr);
 459         if (str_len(tmpstr) > 1)
 460             numeric = 1;
 461         str_free(tmpstr);
 462         str_cat(str," ");
 463         str_scat(str,fstr=walk(1,level,ops[node+3].ival,&numarg,prec));
 464         str_free(fstr);
 465         numeric |= numarg;
 466         if (strEQ(str->str_ptr,"$/ = ''"))
 467             str_set(str, "$/ = \"\\n\\n\"");
 468         break;
 469     case OADD:
 470         prec = P_ADD;
 471         str = walk(1,level,ops[node+1].ival,&numarg,prec);
 472         str_cat(str," + ");
 473         str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,prec+1));
 474         str_free(fstr);
 475         numeric = 1;
 476         break;
 477     case OSUBTRACT:
 478         prec = P_ADD;
 479         str = walk(1,level,ops[node+1].ival,&numarg,prec);
 480         str_cat(str," - ");
 481         str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,prec+1));
 482         str_free(fstr);
 483         numeric = 1;
 484         break;
 485     case OMULT:
 486         prec = P_MUL;
 487         str = walk(1,level,ops[node+1].ival,&numarg,prec);
 488         str_cat(str," * ");
 489         str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,prec+1));
 490         str_free(fstr);
 491         numeric = 1;
 492         break;
 493     case ODIV:
 494         prec = P_MUL;
 495         str = walk(1,level,ops[node+1].ival,&numarg,prec);
 496         str_cat(str," / ");
 497         str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,prec+1));
 498         str_free(fstr);
 499         numeric = 1;
 500         break;
 501     case OPOW:
 502         prec = P_POW;
 503         str = walk(1,level,ops[node+1].ival,&numarg,prec+1);
 504         str_cat(str," ** ");
 505         str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,prec));
 506         str_free(fstr);
 507         numeric = 1;
 508         break;
 509     case OMOD:
 510         prec = P_MUL;
 511         str = walk(1,level,ops[node+1].ival,&numarg,prec);
 512         str_cat(str," % ");
 513         str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,prec+1));
 514         str_free(fstr);
 515         numeric = 1;
 516         break;
 517     case OPOSTINCR:
 518         prec = P_AUTO;
 519         str = walk(1,level,ops[node+1].ival,&numarg,prec+1);
 520         str_cat(str,"++");
 521         numeric = 1;
 522         break;
 523     case OPOSTDECR:
 524         prec = P_AUTO;
 525         str = walk(1,level,ops[node+1].ival,&numarg,prec+1);
 526         str_cat(str,"--");
 527         numeric = 1;
 528         break;
 529     case OPREINCR:
 530         prec = P_AUTO;
 531         str = str_new(0);
 532         str_set(str,"++");
 533         str_scat(str,fstr=walk(1,level,ops[node+1].ival,&numarg,prec+1));
 534         str_free(fstr);
 535         numeric = 1;
 536         break;
 537     case OPREDECR:
 538         prec = P_AUTO;
 539         str = str_new(0);
 540         str_set(str,"--");
 541         str_scat(str,fstr=walk(1,level,ops[node+1].ival,&numarg,prec+1));
 542         str_free(fstr);
 543         numeric = 1;
 544         break;
 545     case OUMINUS:
 546         prec = P_UNARY;
 547         str = str_new(0);
 548         str_set(str,"-");
 549         str_scat(str,fstr=walk(1,level,ops[node+1].ival,&numarg,prec));
 550         str_free(fstr);
 551         numeric = 1;
 552         break;
 553     case OUPLUS:
 554         numeric = 1;
 555         goto def;
 556     case OPAREN:
 557         str = str_new(0);
 558         str_set(str,"(");
 559         str_scat(str,
 560           fstr=walk(useval != 0,level,ops[node+1].ival,&numarg,P_MIN));
 561         str_free(fstr);
 562         str_cat(str,")");
 563         numeric |= numarg;
 564         break;
 565     case OGETLINE:
 566         str = str_new(0);
 567         if (useval)
 568             str_cat(str,"(");
 569         if (len > 0) {
 570             str_scat(str,fstr=walk(1,level,ops[node+1].ival,&numarg,P_MIN));
 571             if (!*fstr->str_ptr) {
 572                 str_cat(str,"$_");
 573                 len = 2;                /* a legal fiction */
 574             }
 575             str_free(fstr);
 576         }
 577         else
 578             str_cat(str,"$_");
 579         if (len > 1) {
 580             tmpstr=walk(1,level,ops[node+3].ival,&numarg,P_MIN);
 581             fstr=walk(1,level,ops[node+2].ival,&numarg,P_MIN);
 582             if (!do_fancy_opens) {
 583                 t = tmpstr->str_ptr;
 584                 if (*t == '"' || *t == '\'')
 585                     t = cpytill(tokenbuf,t+1,*t);
 586                 else
 587                     fatal("Internal error: OGETLINE %s", t);
 588                 d = savestr(t);
 589                 s = savestr(tokenbuf);
 590                 for (t = tokenbuf; *t; t++) {
 591                     *t &= 127;
 592                     if (isLOWER(*t))
 593                         *t = toUPPER(*t);
 594                     if (!isALPHA(*t) && !isDIGIT(*t))
 595                         *t = '_';
 596                 }
 597                 if (!strchr(tokenbuf,'_'))
 598                     strcpy(t,"_FH");
 599                 tmp3str = hfetch(symtab,tokenbuf);
 600                 if (!tmp3str) {
 601                     do_opens = TRUE;
 602                     str_cat(opens,"open(");
 603                     str_cat(opens,tokenbuf);
 604                     str_cat(opens,", ");
 605                     d[1] = '\0';
 606                     str_cat(opens,d);
 607                     str_cat(opens,tmpstr->str_ptr+1);
 608                     opens->str_cur--;
 609                     if (*fstr->str_ptr == '|')
 610                         str_cat(opens,"|");
 611                     str_cat(opens,d);
 612                     if (*fstr->str_ptr == '|')
 613                         str_cat(opens,") || die 'Cannot pipe from \"");
 614                     else
 615                         str_cat(opens,") || die 'Cannot open file \"");
 616                     if (*d == '"')
 617                         str_cat(opens,"'.\"");
 618                     str_cat(opens,s);
 619                     if (*d == '"')
 620                         str_cat(opens,"\".'");
 621                     str_cat(opens,"\".';\n");
 622                     hstore(symtab,tokenbuf,str_make("x"));
 623                 }
 624                 safefree(s);
 625                 safefree(d);
 626                 str_set(tmpstr,"'");
 627                 str_cat(tmpstr,tokenbuf);
 628                 str_cat(tmpstr,"'");
 629             }
 630             if (*fstr->str_ptr == '|')
 631                 str_cat(tmpstr,", '|'");
 632             str_free(fstr);
 633         }
 634         else
 635             tmpstr = str_make("");
 636         sprintf(tokenbuf," = &Getline%d(%s)",len,tmpstr->str_ptr);
 637         str_cat(str,tokenbuf);
 638         str_free(tmpstr);
 639         if (useval)
 640             str_cat(str,",$getline_ok)");
 641         saw_getline |= 1 << len;
 642         break;
 643     case OSPRINTF:
 644         str = str_new(0);
 645         str_set(str,"sprintf(");
 646         str_scat(str,fstr=walk(1,level,ops[node+1].ival,&numarg,P_MIN));
 647         str_free(fstr);
 648         str_cat(str,")");
 649         break;
 650     case OSUBSTR:
 651         str = str_new(0);
 652         str_set(str,"substr(");
 653         str_scat(str,fstr=walk(1,level,ops[node+1].ival,&numarg,P_COMMA+1));
 654         str_free(fstr);
 655         str_cat(str,", ");
 656         str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,P_COMMA+1));
 657         str_free(fstr);
 658         str_cat(str,", ");
 659         if (len == 3) {
 660             str_scat(str,fstr=walk(1,level,ops[node+3].ival,&numarg,P_COMMA+1));
 661             str_free(fstr);
 662         }
 663         else
 664             str_cat(str,"999999");
 665         str_cat(str,")");
 666         break;
 667     case OSTRING:
 668         str = str_new(0);
 669         str_set(str,ops[node+1].cval);
 670         break;
 671     case OSPLIT:
 672         str = str_new(0);
 673         limit = ", 9999)";
 674         numeric = 1;
 675         tmpstr = walk(1,level,ops[node+2].ival,&numarg,P_MIN);
 676         if (useval)
 677             str_set(str,"(@");
 678         else
 679             str_set(str,"@");
 680         str_scat(str,tmpstr);
 681         str_cat(str," = split(");
 682         if (len == 3) {
 683             fstr = walk(1,level,ops[node+3].ival,&numarg,P_COMMA+1);
 684             if (str_len(fstr) == 3 && *fstr->str_ptr == '\'') {
 685                 i = fstr->str_ptr[1] & 127;
 686                 if (strchr("*+?.[]()|^$\\",i))
 687                     sprintf(tokenbuf,"/\\%c/",i);
 688                 else if (i == ' ')
 689                     sprintf(tokenbuf,"' '");
 690                 else
 691                     sprintf(tokenbuf,"/%c/",i);
 692                 str_cat(str,tokenbuf);
 693             }
 694             else
 695                 str_scat(str,fstr);
 696             str_free(fstr);
 697         }
 698         else if (const_FS) {
 699             sprintf(tokenbuf,"/[%c\\n]/",const_FS);
 700             str_cat(str,tokenbuf);
 701         }
 702         else if (saw_FS)
 703             str_cat(str,"$FS");
 704         else {
 705             str_cat(str,"' '");
 706             limit = ")";
 707         }
 708         str_cat(str,", ");
 709         str_scat(str,fstr=walk(1,level,ops[node+1].ival,&numarg,P_COMMA+1));
 710         str_free(fstr);
 711         str_cat(str,limit);
 712         if (useval) {
 713             str_cat(str,")");
 714         }
 715         str_free(tmpstr);
 716         break;
 717     case OINDEX:
 718         str = str_new(0);
 719         str_set(str,"index(");
 720         str_scat(str,fstr=walk(1,level,ops[node+1].ival,&numarg,P_COMMA+1));
 721         str_free(fstr);
 722         str_cat(str,", ");
 723         str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,P_COMMA+1));
 724         str_free(fstr);
 725         str_cat(str,")");
 726         numeric = 1;
 727         break;
 728     case OMATCH:
 729         str = str_new(0);
 730         prec = P_ANDAND;
 731         str_scat(str,fstr=walk(1,level,ops[node+1].ival,&numarg,P_MATCH+1));
 732         str_free(fstr);
 733         str_cat(str," =~ ");
 734         str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,P_MATCH+1));
 735         str_free(fstr);
 736         str_cat(str," && ($RLENGTH = length($&), $RSTART = length($`)+1)");
 737         numeric = 1;
 738         break;
 739     case OUSERDEF:
 740         str = str_new(0);
 741         subretnum = FALSE;
 742         fstr=walk(1,level-1,ops[node+2].ival,&numarg,P_MIN);
 743         curargs = str_new(0);
 744         str_sset(curargs,fstr);
 745         str_cat(curargs,",");
 746         tmp2str=walk(1,level,ops[node+5].ival,&numarg,P_MIN);
 747         str_free(curargs);
 748         curargs = Nullstr;
 749         level--;
 750         subretnum |= numarg;
 751         s = Nullch;
 752         t = tmp2str->str_ptr;
 753         while ((t = instr(t,"return ")))
 754             s = t++;
 755         if (s) {
 756             i = 0;
 757             for (t = s+7; *t; t++) {
 758                 if (*t == ';' || *t == '}')
 759                     i++;
 760             }
 761             if (i == 1) {
 762                 strcpy(s,s+7);
 763                 tmp2str->str_cur -= 7;
 764             }
 765         }
 766         str_set(str,"\n");
 767         tab(str,level);
 768         str_cat(str,"sub ");
 769         str_scat(str,tmpstr=walk(1,level,ops[node+1].ival,&numarg,P_MIN));
 770         str_cat(str," {\n");
 771         tab(str,++level);
 772         if (fstr->str_cur) {
 773             str_cat(str,"local(");
 774             str_scat(str,fstr);
 775             str_cat(str,") = @_;");
 776         }
 777         str_free(fstr);
 778         str_scat(str,fstr=walk(1,level,ops[node+3].ival,&numarg,P_MIN));
 779         str_free(fstr);
 780         fixtab(str,level);
 781         str_scat(str,fstr=walk(1,level,ops[node+4].ival,&numarg,P_MIN));
 782         str_free(fstr);
 783         fixtab(str,level);
 784         str_scat(str,tmp2str);
 785         str_free(tmp2str);
 786         fixtab(str,--level);
 787         str_cat(str,"}\n");
 788         tab(str,level);
 789         str_scat(subs,str);
 790         str_set(str,"");
 791         str_cat(tmpstr,"(");
 792         tmp2str = str_new(0);
 793         if (subretnum)
 794             str_set(tmp2str,"1");
 795         hstore(symtab,tmpstr->str_ptr,tmp2str);
 796         str_free(tmpstr);
 797         level++;
 798         break;
 799     case ORETURN:
 800         str = str_new(0);
 801         if (len > 0) {
 802             str_cat(str,"return ");
 803             str_scat(str,fstr=walk(1,level,ops[node+1].ival,&numarg,P_UNI+1));
 804             str_free(fstr);
 805             if (numarg)
 806                 subretnum = TRUE;
 807         }
 808         else
 809             str_cat(str,"return");
 810         break;
 811     case OUSERFUN:
 812         str = str_new(0);
 813         str_set(str,"&");
 814         str_scat(str,fstr=walk(1,level,ops[node+1].ival,&numarg,P_MIN));
 815         str_free(fstr);
 816         str_cat(str,"(");
 817         tmpstr = hfetch(symtab,str->str_ptr+3);
 818         if (tmpstr && tmpstr->str_ptr)
 819             numeric |= atoi(tmpstr->str_ptr);
 820         str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,P_MIN));
 821         str_free(fstr);
 822         str_cat(str,")");
 823         break;
 824     case OGSUB:
 825     case OSUB:
 826         if (type == OGSUB)
 827             s = "g";
 828         else
 829             s = "";
 830         str = str_new(0);
 831         tmpstr = str_new(0);
 832         i = 0;
 833         if (len == 3) {
 834             tmpstr = walk(1,level,ops[node+3].ival,&numarg,P_MATCH+1);
 835             if (strNE(tmpstr->str_ptr,"$_")) {
 836                 str_cat(tmpstr, " =~ s");
 837                 i++;
 838             }
 839             else
 840                 str_set(tmpstr, "s");
 841         }
 842         else
 843             str_set(tmpstr, "s");
 844         type = ops[ops[node+2].ival].ival;
 845         len = type >> 8;
 846         type &= 255;
 847         tmp3str = str_new(0);
 848         if (type == OSTR) {
 849             tmp2str=walk(1,level,ops[ops[node+2].ival+1].ival,&numarg,P_MIN);
 850             for (t = tmp2str->str_ptr, d=tokenbuf; *t; d++,t++) {
 851                 if (*t == '&')
 852                     *d++ = '$' + 128;
 853                 else if (*t == '$')
 854                     *d++ = '\\' + 128;
 855                 *d = *t + 128;
 856             }
 857             *d = '\0';
 858             str_set(tmp2str,tokenbuf);
 859         }
 860         else {
 861             tmp2str=walk(1,level,ops[node+2].ival,&numarg,P_MIN);
 862             str_set(tmp3str,"($s_ = '\"'.(");
 863             str_scat(tmp3str,tmp2str);
 864             str_cat(tmp3str,").'\"') =~ s/&/\\$&/g, ");
 865             str_set(tmp2str,"eval $s_");
 866             s = (char*)(*s == 'g' ? "ge" : "e");
 867             i++;
 868         }
 869         type = ops[ops[node+1].ival].ival;
 870         len = type >> 8;
 871         type &= 255;
 872         fstr=walk(1,level,ops[node+1].ival,&numarg,P_MIN);
 873         if (type == OREGEX) {
 874             if (useval && i)
 875                 str_cat(str,"(");
 876             str_scat(str,tmp3str);
 877             str_scat(str,tmpstr);
 878             str_scat(str,fstr);
 879             str_scat(str,tmp2str);
 880             str_cat(str,"/");
 881             str_cat(str,s);
 882         }
 883         else if ((type == OFLD && !split_to_array) || (type == OVAR && len == 1)) {
 884             if (useval && i)
 885                 str_cat(str,"(");
 886             str_scat(str,tmp3str);
 887             str_scat(str,tmpstr);
 888             str_cat(str,"/");
 889             str_scat(str,fstr);
 890             str_cat(str,"/");
 891             str_scat(str,tmp2str);
 892             str_cat(str,"/");
 893             str_cat(str,s);
 894         }
 895         else {
 896             i++;
 897             if (useval)
 898                 str_cat(str,"(");
 899             str_cat(str,"$s = ");
 900             str_scat(str,fstr);
 901             str_cat(str,", ");
 902             str_scat(str,tmp3str);
 903             str_scat(str,tmpstr);
 904             str_cat(str,"/$s/");
 905             str_scat(str,tmp2str);
 906             str_cat(str,"/");
 907             str_cat(str,s);
 908         }
 909         if (useval && i)
 910             str_cat(str,")");
 911         str_free(fstr);
 912         str_free(tmpstr);
 913         str_free(tmp2str);
 914         str_free(tmp3str);
 915         numeric = 1;
 916         break;
 917     case ONUM:
 918         str = walk(1,level,ops[node+1].ival,&numarg,P_MIN);
 919         numeric = 1;
 920         break;
 921     case OSTR:
 922         tmpstr = walk(1,level,ops[node+1].ival,&numarg,P_MIN);
 923         s = "'";
 924         for (t = tmpstr->str_ptr, d=tokenbuf; *t; d++,t++) {
 925             if (*t == '\'')
 926                 s = "\"";
 927             else if (*t == '\\') {
 928                 s = "\"";
 929                 *d++ = *t++ + 128;
 930                 switch (*t) {
 931                 case '\\': case '"': case 'n': case 't': case '$':
 932                     break;
 933                 default:        /* hide this from perl */
 934                     *d++ = '\\' + 128;
 935                 }
 936             }
 937             *d = *t + 128;
 938         }
 939         *d = '\0';
 940         str = str_new(0);
 941         str_set(str,s);
 942         str_cat(str,tokenbuf);
 943         str_free(tmpstr);
 944         str_cat(str,s);
 945         break;
 946     case ODEFINED:
 947         prec = P_UNI;
 948         str = str_new(0);
 949         str_set(str,"defined $");
 950         goto addvar;
 951     case ODELETE:
 952         str = str_new(0);
 953         str_set(str,"delete $");
 954         goto addvar;
 955     case OSTAR:
 956         str = str_new(0);
 957         str_set(str,"*");
 958         goto addvar;
 959     case OVAR:
 960         str = str_new(0);
 961         str_set(str,"$");
 962       addvar:
 963         str_scat(str,tmpstr=walk(1,level,ops[node+1].ival,&numarg,P_MIN));
 964         if (len == 1) {
 965             tmp2str = hfetch(symtab,tmpstr->str_ptr);
 966             if (tmp2str && atoi(tmp2str->str_ptr))
 967                 numeric = 2;
 968             if (strEQ(str->str_ptr,"$FNR")) {
 969                 numeric = 1;
 970                 saw_FNR++;
 971                 str_set(str,"($.-$FNRbase)");
 972             }
 973             else if (strEQ(str->str_ptr,"$NR")) {
 974                 numeric = 1;
 975                 str_set(str,"$.");
 976             }
 977             else if (strEQ(str->str_ptr,"$NF")) {
 978                 numeric = 1;
 979                 str_set(str,"$#Fld");
 980             }
 981             else if (strEQ(str->str_ptr,"$0"))
 982                 str_set(str,"$_");
 983             else if (strEQ(str->str_ptr,"$ARGC"))
 984                 str_set(str,"($#ARGV+1)");
 985         }
 986         else {
 987 #ifdef NOTDEF
 988             if (curargs) {
 989                 sprintf(tokenbuf,"$%s,",tmpstr->str_ptr);
 990         ???     if (instr(curargs->str_ptr,tokenbuf))
 991                     str_cat(str,"\377");        /* can't translate yet */
 992             }
 993 #endif
 994             str_cat(tmpstr,"[]");
 995             tmp2str = hfetch(symtab,tmpstr->str_ptr);
 996             if (tmp2str && atoi(tmp2str->str_ptr))
 997                 str_cat(str,"[");
 998             else
 999                 str_cat(str,"{");
1000             str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,P_MIN));
1001             str_free(fstr);
1002             if (strEQ(str->str_ptr,"$ARGV[0")) {
1003                 str_set(str,"$ARGV0");
1004                 saw_argv0++;
1005             }
1006             else {
1007                 if (tmp2str && atoi(tmp2str->str_ptr))
1008                     strcpy(tokenbuf,"]");
1009                 else
1010                     strcpy(tokenbuf,"}");
1011                 *tokenbuf += 128;
1012                 str_cat(str,tokenbuf);
1013             }
1014         }
1015         str_free(tmpstr);
1016         break;
1017     case OFLD:
1018         str = str_new(0);
1019         if (split_to_array) {
1020             str_set(str,"$Fld");
1021             str_cat(str,"[");
1022             str_scat(str,fstr=walk(1,level,ops[node+1].ival,&numarg,P_MIN));
1023             str_free(fstr);
1024             str_cat(str,"]");
1025         }
1026         else {
1027             i = atoi(walk(1,level,ops[node+1].ival,&numarg,P_MIN)->str_ptr);
1028             if (i <= arymax)
1029                 sprintf(tokenbuf,"$%s",nameary[i]);
1030             else
1031                 sprintf(tokenbuf,"$Fld%d",i);
1032             str_set(str,tokenbuf);
1033         }
1034         break;
1035     case OVFLD:
1036         str = str_new(0);
1037         str_set(str,"$Fld[");
1038         i = ops[node+1].ival;
1039         if ((ops[i].ival & 255) == OPAREN)
1040             i = ops[i+1].ival;
1041         tmpstr=walk(1,level,i,&numarg,P_MIN);
1042         str_scat(str,tmpstr);
1043         str_free(tmpstr);
1044         str_cat(str,"]");
1045         break;
1046     case OJUNK:
1047         goto def;
1048     case OSNEWLINE:
1049         str = str_new(2);
1050         str_set(str,";\n");
1051         tab(str,level);
1052         break;
1053     case ONEWLINE:
1054         str = str_new(1);
1055         str_set(str,"\n");
1056         tab(str,level);
1057         break;
1058     case OSCOMMENT:
1059         str = str_new(0);
1060         str_set(str,";");
1061         tmpstr = walk(0,level,ops[node+1].ival,&numarg,P_MIN);
1062         for (s = tmpstr->str_ptr; *s && *s != '\n'; s++)
1063             *s += 128;
1064         str_scat(str,tmpstr);
1065         str_free(tmpstr);
1066         tab(str,level);
1067         break;
1068     case OCOMMENT:
1069         str = str_new(0);
1070         tmpstr = walk(0,level,ops[node+1].ival,&numarg,P_MIN);
1071         for (s = tmpstr->str_ptr; *s && *s != '\n'; s++)
1072             *s += 128;
1073         str_scat(str,tmpstr);
1074         str_free(tmpstr);
1075         tab(str,level);
1076         break;
1077     case OCOMMA:
1078         prec = P_COMMA;
1079         str = walk(1,level,ops[node+1].ival,&numarg,prec);
1080         str_cat(str,", ");
1081         str_scat(str,fstr=walk(1,level,ops[node+2].ival,&numarg,P_MIN));
1082         str_free(fstr);
1083         str_scat(str,fstr=walk(1,level,ops[node+3].ival,&numarg,prec+1));
1084         str_free(fstr);
1085         break;
1086     case OSEMICOLON:
1087         str = str_new(1);
1088         str_set(str,";\n");
1089         tab(str,level);
1090         break;
1091     case OSTATES:
1092         str = walk(0,level,ops[node+1].ival,&numarg,P_MIN);
1093         str_scat(str,fstr=walk(0,level,ops[node+2].ival,&numarg,P_MIN));
1094         str_free(fstr);
1095         break;
1096     case OSTATE:
1097         str = str_new(0);
1098         if (len >= 1) {
1099             str_scat(str,fstr=walk(0,level,ops[node+1].ival,&numarg,P_MIN));
1100             str_free(fstr);
1101             if (len >= 2) {
1102                 tmpstr = walk(0,level,ops[node+2].ival,&numarg,P_MIN);
1103                 if (*tmpstr->str_ptr == ';') {
1104                     addsemi(str);
1105                     str_cat(str,tmpstr->str_ptr+1);
1106                 }
1107                 str_free(tmpstr);
1108             }
1109         }
1110         break;
1111     case OCLOSE:
1112         str = str_make("close(");
1113         tmpstr = walk(1,level,ops[node+1].ival,&numarg,P_MIN);
1114         if (!do_fancy_opens) {
1115             t = tmpstr->str_ptr;
1116             if (*t == '"' || *t == '\'')
1117                 t = cpytill(tokenbuf,t+1,*t);
1118             else
1119                 fatal("Internal error: OCLOSE %s",t);
1120             s = savestr(tokenbuf);
1121             for (t = tokenbuf; *t; t++) {
1122                 *t &= 127;
1123                 if (isLOWER(*t))
1124                     *t = toUPPER(*t);
1125                 if (!isALPHA(*t) && !isDIGIT(*t))
1126                     *t = '_';
1127             }
1128             if (!strchr(tokenbuf,'_'))
1129                 strcpy(t,"_FH");
1130             str_free(tmpstr);
1131             safefree(s);
1132             str_set(str,"close ");
1133             str_cat(str,tokenbuf);
1134         }
1135         else {
1136             sprintf(tokenbuf,"delete $opened{%s} && close(%s)",
1137                tmpstr->str_ptr, tmpstr->str_ptr);
1138             str_free(tmpstr);
1139             str_set(str,tokenbuf);
1140         }
1141         break;
1142     case OPRINTF:
1143     case OPRINT:
1144         lparen = "";    /* set to parens if necessary */
1145         rparen = "";
1146         str = str_new(0);
1147         if (len == 3) {         /* output redirection */
1148             tmpstr = walk(1,level,ops[node+3].ival,&numarg,P_MIN);
1149             tmp2str = walk(1,level,ops[node+2].ival,&numarg,P_MIN);
1150             if (!do_fancy_opens) {
1151                 t = tmpstr->str_ptr;
1152                 if (*t == '"' || *t == '\'')
1153                     t = cpytill(tokenbuf,t+1,*t);
1154                 else
1155                     fatal("Internal error: OPRINT");
1156                 d = savestr(t);
1157                 s = savestr(tokenbuf);
1158                 for (t = tokenbuf; *t; t++) {
1159                     *t &= 127;
1160                     if (isLOWER(*t))
1161                         *t = toUPPER(*t);
1162                     if (!isALPHA(*t) && !isDIGIT(*t))
1163                         *t = '_';
1164                 }
1165                 if (!strchr(tokenbuf,'_'))
1166                     strcpy(t,"_FH");
1167                 tmp3str = hfetch(symtab,tokenbuf);
1168                 if (!tmp3str) {
1169                     str_cat(opens,"open(");
1170                     str_cat(opens,tokenbuf);
1171                     str_cat(opens,", ");
1172                     d[1] = '\0';
1173                     str_cat(opens,d);
1174                     str_scat(opens,tmp2str);
1175                     str_cat(opens,tmpstr->str_ptr+1);
1176                     if (*tmp2str->str_ptr == '|')
1177                         str_cat(opens,") || die 'Cannot pipe to \"");
1178                     else
1179                         str_cat(opens,") || die 'Cannot create file \"");
1180                     if (*d == '"')
1181                         str_cat(opens,"'.\"");
1182                     str_cat(opens,s);
1183                     if (*d == '"')
1184                         str_cat(opens,"\".'");
1185                     str_cat(opens,"\".';\n");
1186                     hstore(symtab,tokenbuf,str_make("x"));
1187                 }
1188                 str_free(tmpstr);
1189                 str_free(tmp2str);
1190                 safefree(s);
1191                 safefree(d);
1192             }
1193             else {
1194                 sprintf(tokenbuf,"&Pick('%s', %s) &&\n",
1195                    tmp2str->str_ptr, tmpstr->str_ptr);
1196                 str_cat(str,tokenbuf);
1197                 tab(str,level+1);
1198                 strcpy(tokenbuf,"$fh");
1199                 str_free(tmpstr);
1200                 str_free(tmp2str);
1201                 lparen = "(";
1202                 rparen = ")";
1203             }
1204         }
1205         else
1206             strcpy(tokenbuf,"");
1207         str_cat(str,lparen);    /* may be null */
1208         if (type == OPRINTF)
1209             str_cat(str,"printf");
1210         else
1211             str_cat(str,"print");
1212         saw_fh = 0;
1213         if (len == 3 || do_fancy_opens) {
1214             if (*tokenbuf) {
1215                 str_cat(str," ");
1216                 saw_fh = 1;
1217             }
1218             str_cat(str,tokenbuf);
1219         }
1220         tmpstr = walk(1+(type==OPRINT),level,ops[node+1].ival,&numarg,P_MIN);
1221         if (!*tmpstr->str_ptr && lval_field) {
1222             t = (char*)(saw_OFS ? "$," : "' '");
1223             if (split_to_array) {
1224                 sprintf(tokenbuf,"join(%s,@Fld)",t);
1225                 str_cat(tmpstr,tokenbuf);
1226             }
1227             else {
1228                 for (i = 1; i < maxfld; i++) {
1229                     if (i <= arymax)
1230                         sprintf(tokenbuf,"$%s, ",nameary[i]);
1231                     else
1232                         sprintf(tokenbuf,"$Fld%d, ",i);
1233                     str_cat(tmpstr,tokenbuf);
1234                 }
1235                 if (maxfld <= arymax)
1236                     sprintf(tokenbuf,"$%s",nameary[maxfld]);
1237                 else
1238                     sprintf(tokenbuf,"$Fld%d",maxfld);
1239                 str_cat(tmpstr,tokenbuf);
1240             }
1241         }
1242         if (*tmpstr->str_ptr) {
1243             str_cat(str," ");
1244             if (!saw_fh && *tmpstr->str_ptr == '(') {
1245                 str_cat(str,"(");
1246                 str_scat(str,tmpstr);
1247                 str_cat(str,")");
1248             }
1249             else
1250                 str_scat(str,tmpstr);
1251         }
1252         else {
1253             str_cat(str," $_");
1254         }
1255         str_cat(str,rparen);    /* may be null */
1256         str_free(tmpstr);
1257         break;
1258     case ORAND:
1259         str = str_make("rand(1)");
1260         break;
1261     case OSRAND:
1262         str = str_make("srand(");
1263         goto maybe0;
1264     case OATAN2:
1265         str = str_make("atan2(");
1266         goto maybe0;
1267     case OSIN:
1268         str = str_make("sin(");
1269         goto maybe0;
1270     case OCOS:
1271         str = str_make("cos(");
1272         goto maybe0;
1273     case OSYSTEM:
1274         str = str_make("system(");
1275         goto maybe0;
1276     case OLENGTH:
1277         str = str_make("length(");
1278         goto maybe0;
1279     case OLOG:
1280         str = str_make("log(");
1281         goto maybe0;
1282     case OEXP:
1283         str = str_make("exp(");
1284         goto maybe0;
1285     case OSQRT:
1286         str = str_make("sqrt(");
1287         goto maybe0;
1288     case OINT:
1289         str = str_make("int(");
1290       maybe0:
1291         numeric = 1;
1292         if (len > 0)
1293             tmpstr = walk(1,level,ops[node+1].ival,&numarg,P_MIN);
1294         else
1295             tmpstr = str_new(0);
1296         if (!tmpstr->str_ptr || !*tmpstr->str_ptr) {
1297             if (lval_field) {
1298                 t = (char*)(saw_OFS ? "$," : "' '");
1299                 if (split_to_array) {
1300                     sprintf(tokenbuf,"join(%s,@Fld)",t);
1301                     str_cat(tmpstr,tokenbuf);
1302                 }
1303                 else {
1304                     sprintf(tokenbuf,"join(%s, ",t);
1305                     str_cat(tmpstr,tokenbuf);
1306                     for (i = 1; i < maxfld; i++) {
1307                         if (i <= arymax)
1308                             sprintf(tokenbuf,"$%s,",nameary[i]);
1309                         else
1310                             sprintf(tokenbuf,"$Fld%d,",i);
1311                         str_cat(tmpstr,tokenbuf);
1312                     }
1313                     if (maxfld <= arymax)
1314                         sprintf(tokenbuf,"$%s)",nameary[maxfld]);
1315                     else
1316                         sprintf(tokenbuf,"$Fld%d)",maxfld);
1317                     str_cat(tmpstr,tokenbuf);
1318                 }
1319             }
1320             else
1321                 str_cat(tmpstr,"$_");
1322         }
1323         if (strEQ(tmpstr->str_ptr,"$_")) {
1324             if (type == OLENGTH && !do_chop) {
1325                 str = str_make("(length(");
1326                 str_cat(tmpstr,") - 1");
1327             }
1328         }
1329         str_scat(str,tmpstr);
1330         str_free(tmpstr);
1331         str_cat(str,")");
1332         break;
1333     case OBREAK:
1334         str = str_new(0);
1335         str_set(str,"last");
1336         break;
1337     case ONEXT:
1338         str = str_new(0);
1339         str_set(str,"next line");
1340         break;
1341     case OEXIT:
1342         str = str_new(0);
1343         if (realexit) {
1344             prec = P_UNI;
1345             str_set(str,"exit");
1346             if (len == 1) {
1347                 str_cat(str," ");
1348                 exitval = TRUE;
1349                 str_scat(str,
1350                   fstr=walk(1,level,ops[node+1].ival,&numarg,prec+1));
1351                 str_free(fstr);
1352             }
1353         }
1354         else {
1355             if (len == 1) {
1356                 str_set(str,"$ExitValue = ");
1357                 exitval = TRUE;
1358                 str_scat(str,
1359                   fstr=walk(1,level,ops[node+1].ival,&numarg,P_ASSIGN));
1360                 str_free(fstr);
1361                 str_cat(str,"; ");
1362             }
1363             str_cat(str,"last line");
1364         }
1365         break;
1366     case OCONTINUE:
1367         str = str_new(0);
1368         str_set(str,"next");
1369         break;
1370     case OREDIR:
1371         goto def;
1372     case OIF:
1373         str = str_new(0);
1374         str_set(str,"if (");
1375         str_scat(str,fstr=walk(1,level,ops[node+1].ival,&numarg,P_MIN));
1376         str_free(fstr);
1377         str_cat(str,") ");
1378         str_scat(str,fstr=walk(0,level,ops[node+2].ival,&numarg,P_MIN));
1379         str_free(fstr);
1380         if (len == 3) {
1381             i = ops[node+3].ival;
1382             if (i) {
1383                 if ((ops[i].ival & 255) == OBLOCK) {
1384                     i = ops[i+1].ival;
1385                     if (i) {
1386                         if ((ops[i].ival & 255) != OIF)
1387                             i = 0;
1388                     }
1389                 }
1390                 else
1391                     i = 0;
1392             }
1393             if (i) {
1394                 str_cat(str,"els");
1395                 str_scat(str,fstr=walk(0,level,i,&numarg,P_MIN));
1396                 str_free(fstr);
1397             }
1398             else {
1399                 str_cat(str,"else ");
1400                 str_scat(str,fstr=walk(0,level,ops[node+3].ival,&numarg,P_MIN));
1401                 str_free(fstr);
1402             }
1403         }
1404         break;
1405     case OWHILE:
1406         str = str_new(0);
1407         str_set(str,"while (");
1408         str_scat(str,fstr=walk(1,level,ops[node+1].ival,&numarg,P_MIN));
1409         str_free(fstr);
1410         str_cat(str,") ");
1411         str_scat(str,fstr=walk(0,level,ops[node+2].ival,&numarg,P_MIN));
1412         str_free(fstr);
1413         break;
1414     case ODO:
1415         str = str_new(0);
1416         str_set(str,"do ");
1417         str_scat(str,fstr=walk(1,level,ops[node+1].ival,&numarg,P_MIN));
1418         str_free(fstr);
1419         if (str->str_ptr[str->str_cur - 1] == '\n')
1420             --str->str_cur;
1421         str_cat(str," while (");
1422         str_scat(str,fstr=walk(0,level,ops[node+2].ival,&numarg,P_MIN));
1423         str_free(fstr);
1424         str_cat(str,");");
1425         break;
1426     case OFOR:
1427         str = str_new(0);
1428         str_set(str,"for (");
1429         str_scat(str,tmpstr=walk(1,level,ops[node+1].ival,&numarg,P_MIN));
1430         i = numarg;
1431         if (i) {
1432             t = s = tmpstr->str_ptr;
1433             while (isALPHA(*t) || isDIGIT(*t) || *t == '$' || *t == '_')
1434                 t++;
1435             i = t - s;
1436             if (i < 2)
1437                 i = 0;
1438         }
1439         str_cat(str,"; ");
1440         fstr=walk(1,level,ops[node+2].ival,&numarg,P_MIN);
1441         if (i && (t = strchr(fstr->str_ptr,0377))) {
1442             if (strnEQ(fstr->str_ptr,s,i))
1443                 *t = ' ';
1444         }
1445         str_scat(str,fstr);
1446         str_free(fstr);
1447         str_free(tmpstr);
1448         str_cat(str,"; ");
1449         str_scat(str,fstr=walk(1,level,ops[node+3].ival,&numarg,P_MIN));
1450         str_free(fstr);
1451         str_cat(str,") ");
1452         str_scat(str,fstr=walk(0,level,ops[node+4].ival,&numarg,P_MIN));
1453         str_free(fstr);
1454         break;
1455     case OFORIN:
1456         tmpstr = walk(0,level,ops[node+1].ival,&numarg,P_MIN);
1457         d = strchr(tmpstr->str_ptr,'$');
1458         if (!d)
1459             fatal("Illegal for loop: %s",tmpstr->str_ptr);
1460         s = strchr(d,'{');
1461         if (!s)
1462             s = strchr(d,'[');
1463         if (!s)
1464             fatal("Illegal for loop: %s",d);
1465         *s++ = '\0';
1466         for (t = s; (i = *t); t++) {
1467             i &= 127;
1468             if (i == '}' || i == ']')
1469                 break;
1470         }
1471         if (*t)
1472             *t = '\0';
1473         str = str_new(0);
1474         str_set(str,d+1);
1475         str_cat(str,"[]");
1476         tmp2str = hfetch(symtab,str->str_ptr);
1477         if (tmp2str && atoi(tmp2str->str_ptr)) {
1478             sprintf(tokenbuf,
1479               "foreach %s ($[ .. $#%s) ",
1480               s,
1481               d+1);
1482         }
1483         else {
1484             sprintf(tokenbuf,
1485               "foreach %s (keys %%%s) ",
1486               s,
1487               d+1);
1488         }
1489         str_set(str,tokenbuf);
1490         str_scat(str,fstr=walk(0,level,ops[node+2].ival,&numarg,P_MIN));
1491         str_free(fstr);
1492         str_free(tmpstr);
1493         break;
1494     case OBLOCK:
1495         str = str_new(0);
1496         str_set(str,"{");
1497         if (len >= 2 && ops[node+2].ival) {
1498             str_scat(str,fstr=walk(0,level,ops[node+2].ival,&numarg,P_MIN));
1499             str_free(fstr);
1500         }
1501         fixtab(str,++level);
1502         str_scat(str,fstr=walk(0,level,ops[node+1].ival,&numarg,P_MIN));
1503         str_free(fstr);
1504         addsemi(str);
1505         fixtab(str,--level);
1506         str_cat(str,"}\n");
1507         tab(str,level);
1508         if (len >= 3) {
1509             str_scat(str,fstr=walk(0,level,ops[node+3].ival,&numarg,P_MIN));
1510             str_free(fstr);
1511         }
1512         break;
1513     default:
1514       def:
1515         if (len) {
1516             if (len > 5)
1517                 fatal("Garbage length in walk");
1518             str = walk(0,level,ops[node+1].ival,&numarg,P_MIN);
1519             for (i = 2; i<= len; i++) {
1520                 str_scat(str,fstr=walk(0,level,ops[node+i].ival,&numarg,P_MIN));
1521                 str_free(fstr);
1522             }
1523         }
1524         else {
1525             str = Nullstr;
1526         }
1527         break;
1528     }
1529     if (!str)
1530         str = str_new(0);
1531
1532     if (useval && prec < minprec) {             /* need parens? */
1533         fstr = str_new(str->str_cur+2);
1534         str_nset(fstr,"(",1);
1535         str_scat(fstr,str);
1536         str_ncat(fstr,")",1);
1537         str_free(str);
1538         str = fstr;
1539     }
1540
1541     *numericptr = numeric;
1542 #ifdef DEBUGGING
1543     if (debug & 4) {
1544         printf("%3d %5d %15s %d %4d ",level,node,opname[type],len,str->str_cur);
1545         for (t = str->str_ptr; *t && t - str->str_ptr < 40; t++)
1546             if (*t == '\n')
1547                 printf("\\n");
1548             else if (*t == '\t')
1549                 printf("\\t");
1550             else
1551                 putchar(*t);
1552         putchar('\n');
1553     }
1554 #endif
1555     return str;
1556 }
1557
1558 static void
1559 tab(register STR *str, register int lvl)
1560 {
1561     while (lvl > 1) {
1562         str_cat(str,"\t");
1563         lvl -= 2;
1564     }
1565     if (lvl)
1566         str_cat(str,"    ");
1567 }
1568
1569 static void
1570 fixtab(register STR *str, register int lvl)
1571 {
1572     register char *s;
1573
1574     /* strip trailing white space */
1575
1576     s = str->str_ptr+str->str_cur - 1;
1577     while (s >= str->str_ptr && (*s == ' ' || *s == '\t' || *s == '\n'))
1578         s--;
1579     s[1] = '\0';
1580     str->str_cur = s + 1 - str->str_ptr;
1581     if (s >= str->str_ptr && *s != '\n')
1582         str_cat(str,"\n");
1583
1584     tab(str,lvl);
1585 }
1586
1587 static void
1588 addsemi(register STR *str)
1589 {
1590     register char *s;
1591
1592     s = str->str_ptr+str->str_cur - 1;
1593     while (s >= str->str_ptr && (*s == ' ' || *s == '\t' || *s == '\n'))
1594         s--;
1595     if (s >= str->str_ptr && *s != ';' && *s != '}')
1596         str_cat(str,";");
1597 }
1598
1599 static void
1600 emit_split(register STR *str, int level)
1601 {
1602     register int i;
1603
1604     if (split_to_array)
1605         str_cat(str,"@Fld");
1606     else {
1607         str_cat(str,"(");
1608         for (i = 1; i < maxfld; i++) {
1609             if (i <= arymax)
1610                 sprintf(tokenbuf,"$%s,",nameary[i]);
1611             else
1612                 sprintf(tokenbuf,"$Fld%d,",i);
1613             str_cat(str,tokenbuf);
1614         }
1615         if (maxfld <= arymax)
1616             sprintf(tokenbuf,"$%s)",nameary[maxfld]);
1617         else
1618             sprintf(tokenbuf,"$Fld%d)",maxfld);
1619         str_cat(str,tokenbuf);
1620     }
1621     if (const_FS) {
1622         sprintf(tokenbuf," = split(/[%c\\n]/, $_, 9999);\n",const_FS);
1623         str_cat(str,tokenbuf);
1624     }
1625     else if (saw_FS)
1626         str_cat(str," = split($FS, $_, 9999);\n");
1627     else
1628         str_cat(str," = split(' ', $_, 9999);\n");
1629     tab(str,level);
1630 }
1631
1632 int
1633 prewalk(int numit, int level, register int node, int *numericptr)
1634 {
1635     register int len;
1636     register int type;
1637     register int i;
1638     int numarg;
1639     int numeric = FALSE;
1640     STR *tmpstr;
1641     STR *tmp2str;
1642
1643     if (!node) {
1644         *numericptr = 0;
1645         return 0;
1646     }
1647     type = ops[node].ival;
1648     len = type >> 8;
1649     type &= 255;
1650     switch (type) {
1651     case OPROG:
1652         prewalk(0,level,ops[node+1].ival,&numarg);
1653         if (ops[node+2].ival) {
1654             prewalk(0,level,ops[node+2].ival,&numarg);
1655         }
1656         ++level;
1657         prewalk(0,level,ops[node+3].ival,&numarg);
1658         --level;
1659         if (ops[node+3].ival) {
1660             prewalk(0,level,ops[node+4].ival,&numarg);
1661         }
1662         break;
1663     case OHUNKS:
1664         prewalk(0,level,ops[node+1].ival,&numarg);
1665         prewalk(0,level,ops[node+2].ival,&numarg);
1666         if (len == 3) {
1667             prewalk(0,level,ops[node+3].ival,&numarg);
1668         }
1669         break;
1670     case ORANGE:
1671         prewalk(1,level,ops[node+1].ival,&numarg);
1672         prewalk(1,level,ops[node+2].ival,&numarg);
1673         break;
1674     case OPAT:
1675         goto def;
1676     case OREGEX:
1677         prewalk(0,level,ops[node+1].ival,&numarg);
1678         break;
1679     case OHUNK:
1680         if (len == 1) {
1681             prewalk(0,level,ops[node+1].ival,&numarg);
1682         }
1683         else {
1684             i = prewalk(0,level,ops[node+1].ival,&numarg);
1685             if (i) {
1686                 ++level;
1687                 prewalk(0,level,ops[node+2].ival,&numarg);
1688                 --level;
1689             }
1690             else {
1691                 prewalk(0,level,ops[node+2].ival,&numarg);
1692             }
1693         }
1694         break;
1695     case OPPAREN:
1696         prewalk(0,level,ops[node+1].ival,&numarg);
1697         break;
1698     case OPANDAND:
1699         prewalk(0,level,ops[node+1].ival,&numarg);
1700         prewalk(0,level,ops[node+2].ival,&numarg);
1701         break;
1702     case OPOROR:
1703         prewalk(0,level,ops[node+1].ival,&numarg);
1704         prewalk(0,level,ops[node+2].ival,&numarg);
1705         break;
1706     case OPNOT:
1707         prewalk(0,level,ops[node+1].ival,&numarg);
1708         break;
1709     case OCPAREN:
1710         prewalk(0,level,ops[node+1].ival,&numarg);
1711         numeric |= numarg;
1712         break;
1713     case OCANDAND:
1714         prewalk(0,level,ops[node+1].ival,&numarg);
1715         numeric = 1;
1716         prewalk(0,level,ops[node+2].ival,&numarg);
1717         break;
1718     case OCOROR:
1719         prewalk(0,level,ops[node+1].ival,&numarg);
1720         numeric = 1;
1721         prewalk(0,level,ops[node+2].ival,&numarg);
1722         break;
1723     case OCNOT:
1724         prewalk(0,level,ops[node+1].ival,&numarg);
1725         numeric = 1;
1726         break;
1727     case ORELOP:
1728         prewalk(0,level,ops[node+2].ival,&numarg);
1729         numeric |= numarg;
1730         prewalk(0,level,ops[node+1].ival,&numarg);
1731         prewalk(0,level,ops[node+3].ival,&numarg);
1732         numeric |= numarg;
1733         numeric = 1;
1734         break;
1735     case ORPAREN:
1736         prewalk(0,level,ops[node+1].ival,&numarg);
1737         numeric |= numarg;
1738         break;
1739     case OMATCHOP:
1740         prewalk(0,level,ops[node+2].ival,&numarg);
1741         prewalk(0,level,ops[node+1].ival,&numarg);
1742         prewalk(0,level,ops[node+3].ival,&numarg);
1743         numeric = 1;
1744         break;
1745     case OMPAREN:
1746         prewalk(0,level,ops[node+1].ival,&numarg);
1747         numeric |= numarg;
1748         break;
1749     case OCONCAT:
1750         prewalk(0,level,ops[node+1].ival,&numarg);
1751         prewalk(0,level,ops[node+2].ival,&numarg);
1752         break;
1753     case OASSIGN:
1754         prewalk(0,level,ops[node+2].ival,&numarg);
1755         prewalk(0,level,ops[node+1].ival,&numarg);
1756         prewalk(0,level,ops[node+3].ival,&numarg);
1757         if (numarg || strlen(ops[ops[node+1].ival+1].cval) > (Size_t)1) {
1758             numericize(ops[node+2].ival);
1759             if (!numarg)
1760                 numericize(ops[node+3].ival);
1761         }
1762         numeric |= numarg;
1763         break;
1764     case OADD:
1765         prewalk(1,level,ops[node+1].ival,&numarg);
1766         prewalk(1,level,ops[node+2].ival,&numarg);
1767         numeric = 1;
1768         break;
1769     case OSUBTRACT:
1770         prewalk(1,level,ops[node+1].ival,&numarg);
1771         prewalk(1,level,ops[node+2].ival,&numarg);
1772         numeric = 1;
1773         break;
1774     case OMULT:
1775         prewalk(1,level,ops[node+1].ival,&numarg);
1776         prewalk(1,level,ops[node+2].ival,&numarg);
1777         numeric = 1;
1778         break;
1779     case ODIV:
1780         prewalk(1,level,ops[node+1].ival,&numarg);
1781         prewalk(1,level,ops[node+2].ival,&numarg);
1782         numeric = 1;
1783         break;
1784     case OPOW:
1785         prewalk(1,level,ops[node+1].ival,&numarg);
1786         prewalk(1,level,ops[node+2].ival,&numarg);
1787         numeric = 1;
1788         break;
1789     case OMOD:
1790         prewalk(1,level,ops[node+1].ival,&numarg);
1791         prewalk(1,level,ops[node+2].ival,&numarg);
1792         numeric = 1;
1793         break;
1794     case OPOSTINCR:
1795         prewalk(1,level,ops[node+1].ival,&numarg);
1796         numeric = 1;
1797         break;
1798     case OPOSTDECR:
1799         prewalk(1,level,ops[node+1].ival,&numarg);
1800         numeric = 1;
1801         break;
1802     case OPREINCR:
1803         prewalk(1,level,ops[node+1].ival,&numarg);
1804         numeric = 1;
1805         break;
1806     case OPREDECR:
1807         prewalk(1,level,ops[node+1].ival,&numarg);
1808         numeric = 1;
1809         break;
1810     case OUMINUS:
1811         prewalk(1,level,ops[node+1].ival,&numarg);
1812         numeric = 1;
1813         break;
1814     case OUPLUS:
1815         prewalk(1,level,ops[node+1].ival,&numarg);
1816         numeric = 1;
1817         break;
1818     case OPAREN:
1819         prewalk(0,level,ops[node+1].ival,&numarg);
1820         numeric |= numarg;
1821         break;
1822     case OGETLINE:
1823         break;
1824     case OSPRINTF:
1825         prewalk(0,level,ops[node+1].ival,&numarg);
1826         break;
1827     case OSUBSTR:
1828         prewalk(0,level,ops[node+1].ival,&numarg);
1829         prewalk(1,level,ops[node+2].ival,&numarg);
1830         if (len == 3) {
1831             prewalk(1,level,ops[node+3].ival,&numarg);
1832         }
1833         break;
1834     case OSTRING:
1835         break;
1836     case OSPLIT:
1837         numeric = 1;
1838         prewalk(0,level,ops[node+2].ival,&numarg);
1839         if (len == 3)
1840             prewalk(0,level,ops[node+3].ival,&numarg);
1841         prewalk(0,level,ops[node+1].ival,&numarg);
1842         break;
1843     case OINDEX:
1844         prewalk(0,level,ops[node+1].ival,&numarg);
1845         prewalk(0,level,ops[node+2].ival,&numarg);
1846         numeric = 1;
1847         break;
1848     case OMATCH:
1849         prewalk(0,level,ops[node+1].ival,&numarg);
1850         prewalk(0,level,ops[node+2].ival,&numarg);
1851         numeric = 1;
1852         break;
1853     case OUSERDEF:
1854         subretnum = FALSE;
1855         --level;
1856         tmpstr = walk(0,level,ops[node+1].ival,&numarg,P_MIN);
1857         ++level;
1858         prewalk(0,level,ops[node+2].ival,&numarg);
1859         prewalk(0,level,ops[node+4].ival,&numarg);
1860         prewalk(0,level,ops[node+5].ival,&numarg);
1861         --level;
1862         str_cat(tmpstr,"(");
1863         tmp2str = str_new(0);
1864         if (subretnum || numarg)
1865             str_set(tmp2str,"1");
1866         hstore(symtab,tmpstr->str_ptr,tmp2str);
1867         str_free(tmpstr);
1868         level++;
1869         break;
1870     case ORETURN:
1871         if (len > 0) {
1872             prewalk(0,level,ops[node+1].ival,&numarg);
1873             if (numarg)
1874                 subretnum = TRUE;
1875         }
1876         break;
1877     case OUSERFUN:
1878         tmp2str = str_new(0);
1879         str_scat(tmp2str,tmpstr=walk(1,level,ops[node+1].ival,&numarg,P_MIN));
1880         fixrargs(tmpstr->str_ptr,ops[node+2].ival,0);
1881         str_free(tmpstr);
1882         str_cat(tmp2str,"(");
1883         tmpstr = hfetch(symtab,tmp2str->str_ptr);
1884         if (tmpstr && tmpstr->str_ptr)
1885             numeric |= atoi(tmpstr->str_ptr);
1886         prewalk(0,level,ops[node+2].ival,&numarg);
1887         str_free(tmp2str);
1888         break;
1889     case OGSUB:
1890     case OSUB:
1891         if (len >= 3)
1892             prewalk(0,level,ops[node+3].ival,&numarg);
1893         prewalk(0,level,ops[ops[node+2].ival+1].ival,&numarg);
1894         prewalk(0,level,ops[node+1].ival,&numarg);
1895         numeric = 1;
1896         break;
1897     case ONUM:
1898         prewalk(0,level,ops[node+1].ival,&numarg);
1899         numeric = 1;
1900         break;
1901     case OSTR:
1902         prewalk(0,level,ops[node+1].ival,&numarg);
1903         break;
1904     case ODEFINED:
1905     case ODELETE:
1906     case OSTAR:
1907     case OVAR:
1908         prewalk(0,level,ops[node+1].ival,&numarg);
1909         if (len == 1) {
1910             if (numit)
1911                 numericize(node);
1912         }
1913         else {
1914             prewalk(0,level,ops[node+2].ival,&numarg);
1915         }
1916         break;
1917     case OFLD:
1918         prewalk(0,level,ops[node+1].ival,&numarg);
1919         break;
1920     case OVFLD:
1921         i = ops[node+1].ival;
1922         prewalk(0,level,i,&numarg);
1923         break;
1924     case OJUNK:
1925         goto def;
1926     case OSNEWLINE:
1927         break;
1928     case ONEWLINE:
1929         break;
1930     case OSCOMMENT:
1931         break;
1932     case OCOMMENT:
1933         break;
1934     case OCOMMA:
1935         prewalk(0,level,ops[node+1].ival,&numarg);
1936         prewalk(0,level,ops[node+2].ival,&numarg);
1937         prewalk(0,level,ops[node+3].ival,&numarg);
1938         break;
1939     case OSEMICOLON:
1940         break;
1941     case OSTATES:
1942         prewalk(0,level,ops[node+1].ival,&numarg);
1943         prewalk(0,level,ops[node+2].ival,&numarg);
1944         break;
1945     case OSTATE:
1946         if (len >= 1) {
1947             prewalk(0,level,ops[node+1].ival,&numarg);
1948             if (len >= 2) {
1949                 prewalk(0,level,ops[node+2].ival,&numarg);
1950             }
1951         }
1952         break;
1953     case OCLOSE:
1954         prewalk(0,level,ops[node+1].ival,&numarg);
1955         break;
1956     case OPRINTF:
1957     case OPRINT:
1958         if (len == 3) {         /* output redirection */
1959             prewalk(0,level,ops[node+3].ival,&numarg);
1960             prewalk(0,level,ops[node+2].ival,&numarg);
1961         }
1962         prewalk(0+(type==OPRINT),level,ops[node+1].ival,&numarg);
1963         break;
1964     case ORAND:
1965         break;
1966     case OSRAND:
1967         goto maybe0;
1968     case OATAN2:
1969         goto maybe0;
1970     case OSIN:
1971         goto maybe0;
1972     case OCOS:
1973         goto maybe0;
1974     case OSYSTEM:
1975         goto maybe0;
1976     case OLENGTH:
1977         goto maybe0;
1978     case OLOG:
1979         goto maybe0;
1980     case OEXP:
1981         goto maybe0;
1982     case OSQRT:
1983         goto maybe0;
1984     case OINT:
1985       maybe0:
1986         numeric = 1;
1987         if (len > 0)
1988             prewalk(type != OLENGTH && type != OSYSTEM,
1989               level,ops[node+1].ival,&numarg);
1990         break;
1991     case OBREAK:
1992         break;
1993     case ONEXT:
1994         break;
1995     case OEXIT:
1996         if (len == 1) {
1997             prewalk(1,level,ops[node+1].ival,&numarg);
1998         }
1999         break;
2000     case OCONTINUE:
2001         break;
2002     case OREDIR:
2003         goto def;
2004     case OIF:
2005         prewalk(0,level,ops[node+1].ival,&numarg);
2006         prewalk(0,level,ops[node+2].ival,&numarg);
2007         if (len == 3) {
2008             prewalk(0,level,ops[node+3].ival,&numarg);
2009         }
2010         break;
2011     case OWHILE:
2012         prewalk(0,level,ops[node+1].ival,&numarg);
2013         prewalk(0,level,ops[node+2].ival,&numarg);
2014         break;
2015     case OFOR:
2016         prewalk(0,level,ops[node+1].ival,&numarg);
2017         prewalk(0,level,ops[node+2].ival,&numarg);
2018         prewalk(0,level,ops[node+3].ival,&numarg);
2019         prewalk(0,level,ops[node+4].ival,&numarg);
2020         break;
2021     case OFORIN:
2022         prewalk(0,level,ops[node+2].ival,&numarg);
2023         prewalk(0,level,ops[node+1].ival,&numarg);
2024         break;
2025     case OBLOCK:
2026         if (len == 2) {
2027             prewalk(0,level,ops[node+2].ival,&numarg);
2028         }
2029         ++level;
2030         prewalk(0,level,ops[node+1].ival,&numarg);
2031         --level;
2032         break;
2033     default:
2034       def:
2035         if (len) {
2036             if (len > 5)
2037                 fatal("Garbage length in prewalk");
2038             prewalk(0,level,ops[node+1].ival,&numarg);
2039             for (i = 2; i<= len; i++) {
2040                 prewalk(0,level,ops[node+i].ival,&numarg);
2041             }
2042         }
2043         break;
2044     }
2045     *numericptr = numeric;
2046     return 1;
2047 }
2048
2049 static void
2050 numericize(register int node)
2051 {
2052     register int len;
2053     register int type;
2054     STR *tmpstr;
2055     STR *tmp2str;
2056     int numarg;
2057
2058     type = ops[node].ival;
2059     len = type >> 8;
2060     type &= 255;
2061     if (type == OVAR && len == 1) {
2062         tmpstr=walk(0,0,ops[node+1].ival,&numarg,P_MIN);
2063         tmp2str = str_make("1");
2064         hstore(symtab,tmpstr->str_ptr,tmp2str);
2065     }
2066 }