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7dc17c60 PK |
1 | /* Copyright (c) 1979 Regents of the University of California */ |
2 | ||
c4e911b6 | 3 | static char sccsid[] = "@(#)nl.c 1.2 %G%"; |
7dc17c60 PK |
4 | |
5 | #include "whoami.h" | |
6 | #include "0.h" | |
7 | #include "opcode.h" | |
8 | #include "objfmt.h" | |
9 | ||
10 | /* | |
11 | * NAMELIST SEGMENT DEFINITIONS | |
12 | */ | |
13 | struct nls { | |
14 | struct nl *nls_low; | |
15 | struct nl *nls_high; | |
16 | } ntab[MAXNL], *nlact; | |
17 | ||
18 | struct nl nl[INL]; | |
19 | struct nl *nlp = nl; | |
20 | struct nls *nlact = ntab; | |
21 | \f | |
22 | /* | |
23 | * all these strings must be places where people can find them | |
24 | * since lookup only looks at the string pointer, not the chars. | |
25 | * see, for example, pTreeInit. | |
26 | */ | |
27 | ||
28 | /* | |
29 | * built in constants | |
30 | */ | |
31 | char *in_consts[] = { | |
32 | "true" , | |
33 | "false" , | |
34 | "TRUE", | |
35 | "FALSE", | |
36 | "minint" , | |
37 | "maxint" , | |
38 | "minchar" , | |
39 | "maxchar" , | |
40 | "bell" , | |
41 | "tab" , | |
42 | 0 | |
43 | }; | |
44 | ||
45 | /* | |
46 | * built in simple types | |
47 | */ | |
48 | char *in_types[] = | |
49 | { | |
50 | "boolean", | |
51 | "char", | |
52 | "integer", | |
53 | "real", | |
54 | "_nil", /* dummy name */ | |
55 | 0 | |
56 | }; | |
57 | ||
58 | int in_rclasses[] = | |
59 | { | |
60 | TINT , | |
61 | TINT , | |
62 | TINT , | |
63 | TCHAR , | |
64 | TBOOL , | |
65 | TDOUBLE , | |
66 | 0 | |
67 | }; | |
68 | ||
69 | long in_ranges[] = | |
70 | { | |
71 | -128L , 128L , | |
72 | -32768L , 32767L , | |
73 | -2147483648L , 2147483647L , | |
74 | 0L , 127L , | |
75 | 0L , 1L , | |
76 | 0L , 0L /* fake for reals */ | |
77 | }; | |
78 | ||
79 | /* | |
80 | * built in constructed types | |
81 | */ | |
82 | char *in_ctypes[] = { | |
83 | "Boolean" , | |
84 | "intset" , | |
85 | "alfa" , | |
86 | "text" , | |
87 | 0 | |
88 | }; | |
89 | ||
90 | /* | |
91 | * built in variables | |
92 | */ | |
93 | char *in_vars[] = { | |
94 | "input" , | |
95 | "output" , | |
96 | 0 | |
97 | }; | |
98 | ||
99 | /* | |
100 | * built in functions | |
101 | */ | |
102 | char *in_funcs[] = | |
103 | { | |
104 | "abs" , | |
105 | "arctan" , | |
106 | "card" , | |
107 | "chr" , | |
108 | "clock" , | |
109 | "cos" , | |
110 | "eof" , | |
111 | "eoln" , | |
112 | "eos" , | |
113 | "exp" , | |
114 | "expo" , | |
115 | "ln" , | |
116 | "odd" , | |
117 | "ord" , | |
118 | "pred" , | |
119 | "round" , | |
120 | "sin" , | |
121 | "sqr" , | |
122 | "sqrt" , | |
123 | "succ" , | |
124 | "trunc" , | |
125 | "undefined" , | |
126 | /* | |
127 | * Extensions | |
128 | */ | |
129 | "argc" , | |
130 | "random" , | |
131 | "seed" , | |
132 | "wallclock" , | |
133 | "sysclock" , | |
134 | 0 | |
135 | }; | |
136 | ||
137 | /* | |
138 | * Built-in procedures | |
139 | */ | |
140 | char *in_procs[] = | |
141 | { | |
142 | "date" , | |
143 | "dispose" , | |
144 | "flush" , | |
145 | "get" , | |
146 | "getseg" , | |
147 | "halt" , | |
148 | "linelimit" , | |
149 | "message" , | |
150 | "new" , | |
151 | "pack" , | |
152 | "page" , | |
153 | "put" , | |
154 | "putseg" , | |
155 | "read" , | |
156 | "readln" , | |
157 | "remove" , | |
158 | "reset" , | |
159 | "rewrite" , | |
160 | "time" , | |
161 | "unpack" , | |
162 | "write" , | |
163 | "writeln" , | |
164 | /* | |
165 | * Extensions | |
166 | */ | |
167 | "argv" , | |
168 | "null" , | |
169 | "stlimit" , | |
170 | 0 | |
171 | }; | |
172 | ||
173 | #ifndef PI0 | |
174 | /* | |
175 | * and their opcodes | |
176 | */ | |
177 | int in_fops[] = | |
178 | { | |
179 | O_ABS2, | |
180 | O_ATAN, | |
181 | O_CARD|NSTAND, | |
182 | O_CHR2, | |
183 | O_CLCK|NSTAND, | |
184 | O_COS, | |
185 | O_EOF, | |
186 | O_EOLN, | |
187 | 0, | |
188 | O_EXP, | |
189 | O_EXPO|NSTAND, | |
190 | O_LN, | |
191 | O_ODD2, | |
192 | O_ORD2, | |
193 | O_PRED2, | |
194 | O_ROUND, | |
195 | O_SIN, | |
196 | O_SQR2, | |
197 | O_SQRT, | |
198 | O_SUCC2, | |
199 | O_TRUNC, | |
200 | O_UNDEF|NSTAND, | |
201 | /* | |
202 | * Extensions | |
203 | */ | |
204 | O_ARGC|NSTAND, | |
205 | O_RANDOM|NSTAND, | |
206 | O_SEED|NSTAND, | |
207 | O_WCLCK|NSTAND, | |
208 | O_SCLCK|NSTAND | |
209 | }; | |
210 | ||
211 | /* | |
212 | * Built-in procedures | |
213 | */ | |
214 | int in_pops[] = | |
215 | { | |
216 | O_DATE|NSTAND, | |
217 | O_DISPOSE, | |
218 | O_FLUSH|NSTAND, | |
219 | O_GET, | |
220 | 0, | |
221 | O_HALT|NSTAND, | |
222 | O_LLIMIT|NSTAND, | |
223 | O_MESSAGE|NSTAND, | |
224 | O_NEW, | |
225 | O_PACK, | |
226 | O_PAGE, | |
227 | O_PUT, | |
228 | 0, | |
229 | O_READ4, | |
230 | O_READLN, | |
231 | O_REMOVE|NSTAND, | |
232 | O_RESET, | |
233 | O_REWRITE, | |
234 | O_TIME|NSTAND, | |
235 | O_UNPACK, | |
236 | O_WRITEF, | |
237 | O_WRITLN, | |
238 | /* | |
239 | * Extensions | |
240 | */ | |
241 | O_ARGV|NSTAND, | |
242 | O_ABORT|NSTAND, | |
243 | O_STLIM|NSTAND | |
244 | }; | |
245 | #endif | |
246 | ||
247 | /* | |
248 | * Initnl initializes the first namelist segment and then | |
249 | * initializes the name list for block 0. | |
250 | */ | |
251 | initnl() | |
252 | { | |
253 | register char **cp; | |
254 | register struct nl *np; | |
255 | struct nl *fp; | |
256 | int *ip; | |
257 | long *lp; | |
258 | ||
259 | #ifdef DEBUG | |
260 | if ( hp21mx ) | |
261 | { | |
262 | MININT = -32768.; | |
263 | MAXINT = 32767.; | |
264 | #ifndef PI0 | |
265 | genmx(); | |
266 | #endif | |
267 | } | |
268 | #endif | |
269 | ntab[0].nls_low = nl; | |
270 | ntab[0].nls_high = &nl[INL]; | |
271 | defnl ( 0 , 0 , 0 , 0 ); | |
272 | ||
273 | /* | |
274 | * Types | |
275 | */ | |
276 | for ( cp = in_types ; *cp != 0 ; cp ++ ) | |
277 | hdefnl ( *cp , TYPE , nlp , 0 ); | |
278 | ||
279 | /* | |
280 | * Ranges | |
281 | */ | |
282 | lp = in_ranges; | |
283 | for ( ip = in_rclasses ; *ip != 0 ; ip ++ ) | |
284 | { | |
285 | np = defnl ( 0 , RANGE , nl+(*ip) , 0 ); | |
286 | nl[*ip].type = np; | |
287 | np -> range[0] = *lp ++ ; | |
288 | np -> range[1] = *lp ++ ; | |
289 | ||
290 | }; | |
291 | ||
292 | /* | |
293 | * built in constructed types | |
294 | */ | |
295 | ||
296 | cp = in_ctypes; | |
297 | /* | |
298 | * Boolean = boolean; | |
299 | */ | |
300 | hdefnl ( *cp++ , TYPE , nl+T1BOOL , 0 ); | |
301 | ||
302 | /* | |
303 | * intset = set of 0 .. 127; | |
304 | */ | |
305 | intset = *cp++; | |
306 | hdefnl( intset , TYPE , nlp+1 , 0 ); | |
307 | defnl ( 0 , SET , nlp+1 , 0 ); | |
308 | np = defnl ( 0 , RANGE , nl+TINT , 0 ); | |
309 | np -> range[0] = 0L; | |
310 | np -> range[1] = 127L; | |
311 | ||
312 | /* | |
313 | * alfa = array [ 1 .. 10 ] of char; | |
314 | */ | |
315 | np = defnl ( 0 , RANGE , nl+TINT , 0 ); | |
316 | np -> range[0] = 1L; | |
317 | np -> range[1] = 10L; | |
318 | defnl ( 0 , ARRAY , nl+T1CHAR , 1 ) -> chain = np; | |
319 | hdefnl ( *cp++ , TYPE , nlp-1 , 0 ); | |
320 | ||
321 | /* | |
322 | * text = file of char; | |
323 | */ | |
324 | hdefnl ( *cp++ , TYPE , nlp+1 , 0 ); | |
325 | np = defnl ( 0 , FILET , nl+T1CHAR , 0 ); | |
326 | np -> nl_flags |= NFILES; | |
327 | ||
328 | /* | |
329 | * input,output : text; | |
330 | */ | |
331 | cp = in_vars; | |
332 | # ifndef PI0 | |
333 | input = hdefnl ( *cp++ , VAR , np , INPUT_OFF ); | |
334 | output = hdefnl ( *cp++ , VAR , np , OUTPUT_OFF ); | |
335 | # else | |
336 | input = hdefnl ( *cp++ , VAR , np , 0 ); | |
337 | output = hdefnl ( *cp++ , VAR , np , 0 ); | |
338 | # endif | |
339 | ||
340 | /* | |
341 | * built in constants | |
342 | */ | |
343 | cp = in_consts; | |
344 | np = hdefnl ( *cp++ , CONST , nl + TBOOL , 1 ); | |
345 | fp = hdefnl ( *cp++ , CONST , nl + TBOOL , 0 ); | |
346 | (nl + TBOOL)->chain = fp; | |
347 | fp->chain = np; | |
348 | np = hdefnl ( *cp++ , CONST , nl + TBOOL , 1 ); | |
349 | fp = hdefnl ( *cp++ , CONST , nl + TBOOL , 0 ); | |
350 | fp->chain = np; | |
351 | if (opt('s')) | |
352 | (nl + TBOOL)->chain = fp; | |
353 | hdefnl ( *cp++ , CONST , nl + T4INT , 0 ) -> range[0] = MININT; | |
354 | hdefnl ( *cp++ , CONST , nl + T4INT , 0 ) -> range[0] = MAXINT; | |
355 | hdefnl ( *cp++ , CONST , nl + T1CHAR , 0 ); | |
356 | hdefnl ( *cp++ , CONST , nl + T1CHAR , 127 ); | |
357 | hdefnl ( *cp++ , CONST , nl + T1CHAR , '\007' ); | |
358 | hdefnl ( *cp++ , CONST , nl + T1CHAR , '\t' ); | |
359 | ||
360 | /* | |
361 | * Built-in functions and procedures | |
362 | */ | |
363 | #ifndef PI0 | |
364 | ip = in_fops; | |
365 | for ( cp = in_funcs ; *cp != 0 ; cp ++ ) | |
366 | hdefnl ( *cp , FUNC , 0 , * ip ++ ); | |
367 | ip = in_pops; | |
368 | for ( cp = in_procs ; *cp != 0 ; cp ++ ) | |
369 | hdefnl ( *cp , PROC , 0 , * ip ++ ); | |
370 | #else | |
371 | for ( cp = in_funcs ; *cp != 0 ; cp ++ ) | |
372 | hdefnl ( *cp , FUNC , 0 , 0 ); | |
373 | for ( cp = in_procs ; *cp != 0 , cp ++ ) | |
374 | hdefnl ( *cp , PROC , 0 , 0 ); | |
375 | #endif | |
376 | # ifdef PTREE | |
377 | pTreeInit(); | |
378 | # endif | |
379 | } | |
380 | ||
381 | struct nl * | |
382 | hdefnl(sym, cls, typ, val) | |
383 | { | |
384 | register struct nl *p; | |
385 | ||
386 | #ifndef PI1 | |
387 | if (sym) | |
388 | hash(sym, 0); | |
389 | #endif | |
390 | p = defnl(sym, cls, typ, val); | |
391 | if (sym) | |
392 | enter(p); | |
393 | return (p); | |
394 | } | |
395 | ||
396 | /* | |
397 | * Free up the name list segments | |
398 | * at the end of a statement/proc/func | |
399 | * All segments are freed down to the one in which | |
400 | * p points. | |
401 | */ | |
402 | nlfree(p) | |
403 | struct nl *p; | |
404 | { | |
405 | ||
406 | nlp = p; | |
407 | while (nlact->nls_low > nlp || nlact->nls_high < nlp) { | |
408 | free(nlact->nls_low); | |
409 | nlact->nls_low = NIL; | |
410 | nlact->nls_high = NIL; | |
411 | --nlact; | |
412 | if (nlact < &ntab[0]) | |
413 | panic("nlfree"); | |
414 | } | |
415 | } | |
416 | \f | |
417 | ||
418 | char *VARIABLE = "variable"; | |
419 | ||
420 | char *classes[ ] = { | |
421 | "undefined", | |
422 | "constant", | |
423 | "type", | |
424 | "variable", /* VARIABLE */ | |
425 | "array", | |
426 | "pointer or file", | |
427 | "record", | |
428 | "field", | |
429 | "procedure", | |
430 | "function", | |
431 | "variable", /* VARIABLE */ | |
432 | "variable", /* VARIABLE */ | |
433 | "pointer", | |
434 | "file", | |
435 | "set", | |
436 | "subrange", | |
437 | "label", | |
438 | "withptr", | |
439 | "scalar", | |
440 | "string", | |
441 | "program", | |
c4e911b6 PK |
442 | "improper", |
443 | "variant", | |
444 | "formal procedure", | |
445 | "formal function" | |
7dc17c60 PK |
446 | }; |
447 | ||
448 | char *snark = "SNARK"; | |
449 | ||
450 | #ifdef PI | |
451 | #ifdef DEBUG | |
452 | char *ctext[] = | |
453 | { | |
454 | "BADUSE", | |
455 | "CONST", | |
456 | "TYPE", | |
457 | "VAR", | |
458 | "ARRAY", | |
459 | "PTRFILE", | |
460 | "RECORD", | |
461 | "FIELD", | |
462 | "PROC", | |
463 | "FUNC", | |
464 | "FVAR", | |
465 | "REF", | |
466 | "PTR", | |
467 | "FILET", | |
468 | "SET", | |
469 | "RANGE", | |
470 | "LABEL", | |
471 | "WITHPTR", | |
472 | "SCAL", | |
473 | "STR", | |
474 | "PROG", | |
475 | "IMPROPER", | |
c4e911b6 PK |
476 | "VARNT", |
477 | "FPROC", | |
478 | "FFUNC" | |
7dc17c60 PK |
479 | }; |
480 | ||
481 | char *stars = "\t***"; | |
482 | ||
483 | /* | |
484 | * Dump the namelist from the | |
485 | * current nlp down to 'to'. | |
486 | * All the namelist is dumped if | |
487 | * to is NIL. | |
488 | */ | |
489 | dumpnl(to, rout) | |
490 | struct nl *to; | |
491 | { | |
492 | register struct nl *p; | |
493 | register int j; | |
494 | struct nls *nlsp; | |
495 | int i, v, head; | |
496 | ||
497 | if (opt('y') == 0) | |
498 | return; | |
499 | if (to != NIL) | |
500 | printf("\n\"%s\" Block=%d\n", rout, cbn); | |
501 | nlsp = nlact; | |
502 | head = NIL; | |
503 | for (p = nlp; p != to;) { | |
504 | if (p == nlsp->nls_low) { | |
505 | if (nlsp == &ntab[0]) | |
506 | break; | |
507 | nlsp--; | |
508 | p = nlsp->nls_high; | |
509 | } | |
510 | p--; | |
511 | if (head == NIL) { | |
512 | printf("\tName\tClass Bn+Flags\tType\tVal\tChn\n"); | |
513 | head++; | |
514 | } | |
515 | printf("%3d:", nloff(p)); | |
516 | if (p->symbol) | |
517 | printf("\t%.7s", p->symbol); | |
518 | else | |
519 | printf(stars); | |
520 | if (p->class) | |
521 | printf("\t%s", ctext[p->class]); | |
522 | else | |
523 | printf(stars); | |
524 | if (p->nl_flags) { | |
525 | pchr('\t'); | |
526 | if (p->nl_flags & 037) | |
527 | printf("%d ", p->nl_flags & 037); | |
528 | #ifndef PI0 | |
529 | if (p->nl_flags & NMOD) | |
530 | pchr('M'); | |
531 | if (p->nl_flags & NUSED) | |
532 | pchr('U'); | |
533 | #endif | |
534 | if (p->nl_flags & NFILES) | |
535 | pchr('F'); | |
536 | } else | |
537 | printf(stars); | |
538 | if (p->type) | |
539 | printf("\t[%d]", nloff(p->type)); | |
540 | else | |
541 | printf(stars); | |
542 | v = p->value[0]; | |
543 | switch (p->class) { | |
544 | case TYPE: | |
545 | break; | |
546 | case VARNT: | |
547 | goto con; | |
548 | case CONST: | |
549 | switch (nloff(p->type)) { | |
550 | default: | |
551 | printf("\t%d", v); | |
552 | break; | |
553 | case TDOUBLE: | |
554 | printf("\t%f", p->real); | |
555 | break; | |
556 | case TINT: | |
557 | case T4INT: | |
558 | con: | |
559 | printf("\t%ld", p->range[0]); | |
560 | break; | |
561 | case TSTR: | |
562 | printf("\t'%s'", p->ptr[0]); | |
563 | break; | |
564 | } | |
565 | break; | |
566 | case VAR: | |
567 | case REF: | |
568 | case WITHPTR: | |
c4e911b6 PK |
569 | case FFUNC: |
570 | case FPROC: | |
7dc17c60 PK |
571 | printf("\t%d,%d", cbn, v); |
572 | break; | |
573 | case SCAL: | |
574 | case RANGE: | |
575 | printf("\t%ld..%ld", p->range[0], p->range[1]); | |
576 | break; | |
577 | case RECORD: | |
578 | printf("\t%d(%d)", v, p->value[NL_FLDSZ]); | |
579 | break; | |
580 | case FIELD: | |
581 | printf("\t%d", v); | |
582 | break; | |
583 | case STR: | |
584 | printf("\t|%d|", p->value[0]); | |
585 | break; | |
586 | case FVAR: | |
587 | case FUNC: | |
588 | case PROC: | |
589 | case PROG: | |
590 | if (cbn == 0) { | |
591 | printf("\t<%o>", p->value[0] & 0377); | |
592 | #ifndef PI0 | |
593 | if (p->value[0] & NSTAND) | |
594 | printf("\tNSTAND"); | |
595 | #endif | |
596 | break; | |
597 | } | |
598 | v = p->value[1]; | |
599 | default: | |
600 | casedef: | |
601 | if (v) | |
602 | printf("\t<%d>", v); | |
603 | else | |
604 | printf(stars); | |
605 | } | |
606 | if (p->chain) | |
607 | printf("\t[%d]", nloff(p->chain)); | |
608 | switch (p->class) { | |
609 | case RECORD: | |
610 | if (p->ptr[NL_VARNT]) | |
611 | printf("\tVARNT=[%d]", nloff(p->ptr[NL_VARNT])); | |
612 | if (p->ptr[NL_TAG]) | |
613 | printf(" TAG=[%d]", nloff(p->ptr[NL_TAG])); | |
614 | break; | |
615 | case VARNT: | |
616 | printf("\tVTOREC=[%d]", nloff(p->ptr[NL_VTOREC])); | |
617 | break; | |
618 | } | |
619 | # ifdef PTREE | |
620 | pchr( '\t' ); | |
621 | pPrintPointer( stdout , "%s" , p -> inTree ); | |
622 | # endif | |
623 | pchr('\n'); | |
624 | } | |
625 | if (head == 0) | |
626 | printf("\tNo entries\n"); | |
627 | } | |
628 | #endif | |
629 | ||
630 | \f | |
631 | /* | |
632 | * Define a new name list entry | |
633 | * with initial symbol, class, type | |
634 | * and value[0] as given. A new name | |
635 | * list segment is allocated to hold | |
636 | * the next name list slot if necessary. | |
637 | */ | |
638 | struct nl * | |
639 | defnl(sym, cls, typ, val) | |
640 | char *sym; | |
641 | int cls; | |
642 | struct nl *typ; | |
643 | int val; | |
644 | { | |
645 | register struct nl *p; | |
646 | register int *q, i; | |
647 | char *cp; | |
648 | ||
649 | p = nlp; | |
650 | ||
651 | /* | |
652 | * Zero out this entry | |
653 | */ | |
654 | q = p; | |
655 | i = (sizeof *p)/(sizeof (int)); | |
656 | do | |
657 | *q++ = 0; | |
658 | while (--i); | |
659 | ||
660 | /* | |
661 | * Insert the values | |
662 | */ | |
663 | p->symbol = sym; | |
664 | p->class = cls; | |
665 | p->type = typ; | |
666 | p->nl_block = cbn; | |
667 | p->value[0] = val; | |
668 | ||
669 | /* | |
670 | * Insure that the next namelist | |
671 | * entry actually exists. This is | |
672 | * really not needed here, it would | |
673 | * suffice to do it at entry if we | |
674 | * need the slot. It is done this | |
675 | * way because, historically, nlp | |
676 | * always pointed at the next namelist | |
677 | * slot. | |
678 | */ | |
679 | nlp++; | |
680 | if (nlp >= nlact->nls_high) { | |
681 | i = NLINC; | |
682 | cp = malloc(NLINC * sizeof *nlp); | |
683 | if (cp == -1) { | |
684 | i = NLINC / 2; | |
685 | cp = malloc((NLINC / 2) * sizeof *nlp); | |
686 | } | |
687 | if (cp == -1) { | |
688 | error("Ran out of memory (defnl)"); | |
689 | pexit(DIED); | |
690 | } | |
691 | nlact++; | |
692 | if (nlact >= &ntab[MAXNL]) { | |
693 | error("Ran out of name list tables"); | |
694 | pexit(DIED); | |
695 | } | |
696 | nlp = cp; | |
697 | nlact->nls_low = nlp; | |
698 | nlact->nls_high = nlact->nls_low + i; | |
699 | } | |
700 | return (p); | |
701 | } | |
702 | ||
703 | /* | |
704 | * Make a duplicate of the argument | |
705 | * namelist entry for, e.g., type | |
706 | * declarations of the form 'type a = b' | |
707 | * and array indicies. | |
708 | */ | |
709 | struct nl * | |
710 | nlcopy(p) | |
711 | struct nl *p; | |
712 | { | |
713 | register int *p1, *p2, i; | |
714 | ||
715 | p1 = p; | |
716 | p = p2 = defnl(0, 0, 0, 0); | |
717 | i = (sizeof *p)/(sizeof (int)); | |
718 | do | |
719 | *p2++ = *p1++; | |
720 | while (--i); | |
721 | p->chain = NIL; | |
722 | return (p); | |
723 | } | |
724 | ||
725 | /* | |
726 | * Compute a namelist offset | |
727 | */ | |
728 | nloff(p) | |
729 | struct nl *p; | |
730 | { | |
731 | ||
732 | return (p - nl); | |
733 | } | |
734 | \f | |
735 | /* | |
736 | * Enter a symbol into the block | |
737 | * symbol table. Symbols are hashed | |
738 | * 64 ways based on low 6 bits of the | |
739 | * character pointer into the string | |
740 | * table. | |
741 | */ | |
742 | struct nl * | |
743 | enter(np) | |
744 | struct nl *np; | |
745 | { | |
746 | register struct nl *rp, *hp; | |
747 | register struct nl *p; | |
748 | int i; | |
749 | ||
750 | rp = np; | |
751 | if (rp == NIL) | |
752 | return (NIL); | |
753 | #ifndef PI1 | |
754 | if (cbn > 0) | |
755 | if (rp->symbol == input->symbol || rp->symbol == output->symbol) | |
756 | error("Pre-defined files input and output must not be redefined"); | |
757 | #endif | |
758 | i = rp->symbol; | |
759 | i &= 077; | |
760 | hp = disptab[i]; | |
761 | if (rp->class != BADUSE && rp->class != FIELD) | |
762 | for (p = hp; p != NIL && (p->nl_block & 037) == cbn; p = p->nl_next) | |
763 | if (p->symbol == rp->symbol && p->class != BADUSE && p->class != FIELD) { | |
764 | #ifndef PI1 | |
765 | error("%s is already defined in this block", rp->symbol); | |
766 | #endif | |
767 | break; | |
768 | ||
769 | } | |
770 | rp->nl_next = hp; | |
771 | disptab[i] = rp; | |
772 | return (rp); | |
773 | } | |
774 | #endif |