Line data Source code
1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /*
3 : * This file is part of the LibreOffice project.
4 : *
5 : * This Source Code Form is subject to the terms of the Mozilla Public
6 : * License, v. 2.0. If a copy of the MPL was not distributed with this
7 : * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 : *
9 : * This file incorporates work covered by the following license notice:
10 : *
11 : * Licensed to the Apache Software Foundation (ASF) under one or more
12 : * contributor license agreements. See the NOTICE file distributed
13 : * with this work for additional information regarding copyright
14 : * ownership. The ASF licenses this file to you under the Apache
15 : * License, Version 2.0 (the "License"); you may not use this file
16 : * except in compliance with the License. You may obtain a copy of
17 : * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 : */
19 :
20 : #include <stdio.h>
21 : #include <ctype.h>
22 : #include "cppdef.h"
23 : #include "cpp.h"
24 :
25 : /*
26 : * Evaluate an #if expression.
27 : */
28 :
29 : static char *opname[] = { /* For debug and error messages */
30 : "end of expression", "val", "id",
31 : "+", "-", "*", "/", "%",
32 : "<<", ">>", "&", "|", "^",
33 : "==", "!=", "<", "<=", ">=", ">",
34 : "&&", "||", "?", ":", ",",
35 : "unary +", "unary -", "~", "!", "(", ")", "(none)",
36 : };
37 :
38 : /*
39 : * opdope[] has the operator precedence:
40 : * Bits
41 : * 7 Unused (so the value is always positive)
42 : * 6-2 Precedence (000x .. 017x)
43 : * 1-0 Binary op. flags:
44 : * 01 The binop flag should be set/cleared when this op is seen.
45 : * 10 The new value of the binop flag.
46 : * Note: Expected, New binop
47 : * constant 0 1 Binop, end, or ) should follow constants
48 : * End of line 1 0 End may not be preceeded by an operator
49 : * binary 1 0 Binary op follows a value, value follows.
50 : * unary 0 0 Unary op doesn't follow a value, value follows
51 : * ( 0 0 Doesn't follow value, value or unop follows
52 : * ) 1 1 Follows value. Op follows.
53 : */
54 :
55 : static char opdope[OP_MAX] = {
56 : 0001, /* End of expression */
57 : 0002, /* Digit */
58 : 0000, /* Letter (identifier) */
59 : 0141, 0141, 0151, 0151, 0151, /* ADD, SUB, MUL, DIV, MOD */
60 : 0131, 0131, 0101, 0071, 0071, /* ASL, ASR, AND, OR, XOR */
61 : 0111, 0111, 0121, 0121, 0121, 0121, /* EQ, NE, LT, LE, GE, GT */
62 : 0061, 0051, 0041, 0041, 0031, /* ANA, ORO, QUE, COL, CMA */
63 : /*
64 : * Unary op's follow
65 : */
66 : 0160, 0160, 0160, 0160, /* NEG, PLU, COM, NOT */
67 : 0170, 0013, 0023, /* LPA, RPA, END */
68 : };
69 : /*
70 : * OP_QUE and OP_RPA have alternate precedences:
71 : */
72 : #define OP_RPA_PREC 0013
73 : #define OP_QUE_PREC 0034
74 :
75 : /*
76 : * S_ANDOR and S_QUEST signal "short-circuit" boolean evaluation, so that
77 : * #if FOO != 0 && 10 / FOO ...
78 : * doesn't generate an error message. They are stored in optab.skip.
79 : */
80 : #define S_ANDOR 2
81 : #define S_QUEST 1
82 :
83 : typedef struct optab {
84 : char op; /* Operator */
85 : char prec; /* Its precedence */
86 : char skip; /* Short-circuit: TRUE to skip */
87 : } OPTAB;
88 : static int evalue; /* Current value from evallex() */
89 :
90 : #ifdef nomacargs
91 : FILE_LOCAL int
92 : isbinary(op)
93 : register int op;
94 : {
95 : return (op >= FIRST_BINOP && op <= LAST_BINOP);
96 : }
97 : #else
98 : #define isbinary(op) (op >= FIRST_BINOP && op <= LAST_BINOP)
99 : #endif
100 :
101 : /*
102 : * The following definitions are used to specify basic variable sizes.
103 : */
104 :
105 : #ifndef S_CHAR
106 : #define S_CHAR (sizeof (char))
107 : #endif
108 : #ifndef S_SINT
109 : #define S_SINT (sizeof (short int))
110 : #endif
111 : #ifndef S_INT
112 : #define S_INT (sizeof (int))
113 : #endif
114 : #ifndef S_LINT
115 : #define S_LINT (sizeof (long int))
116 : #endif
117 : #ifndef S_FLOAT
118 : #define S_FLOAT (sizeof (float))
119 : #endif
120 : #ifndef S_DOUBLE
121 : #define S_DOUBLE (sizeof (double))
122 : #endif
123 : #ifndef S_PCHAR
124 : #define S_PCHAR (sizeof (char *))
125 : #endif
126 : #ifndef S_PSINT
127 : #define S_PSINT (sizeof (short int *))
128 : #endif
129 : #ifndef S_PINT
130 : #define S_PINT (sizeof (int *))
131 : #endif
132 : #ifndef S_PLINT
133 : #define S_PLINT (sizeof (long int *))
134 : #endif
135 : #ifndef S_PFLOAT
136 : #define S_PFLOAT (sizeof (float *))
137 : #endif
138 : #ifndef S_PDOUBLE
139 : #define S_PDOUBLE (sizeof (double *))
140 : #endif
141 : #ifndef S_PFPTR
142 : #define S_PFPTR (sizeof (int (*)()))
143 : #endif
144 :
145 : typedef struct types {
146 : short type; /* This is the bit if */
147 : char *name; /* this is the token word */
148 : } TYPES;
149 :
150 : static TYPES basic_types[] = {
151 : { T_CHAR, "char", },
152 : { T_INT, "int", },
153 : { T_FLOAT, "float", },
154 : { T_DOUBLE, "double", },
155 : { T_SHORT, "short", },
156 : { T_LONG, "long", },
157 : { T_SIGNED, "signed", },
158 : { T_UNSIGNED, "unsigned", },
159 : { 0, NULL, }, /* Signal end */
160 : };
161 :
162 : /*
163 : * Test_table[] is used to test for illegal combinations.
164 : */
165 : static short test_table[] = {
166 : T_FLOAT | T_DOUBLE | T_LONG | T_SHORT,
167 : T_FLOAT | T_DOUBLE | T_CHAR | T_INT,
168 : T_FLOAT | T_DOUBLE | T_SIGNED | T_UNSIGNED,
169 : T_LONG | T_SHORT | T_CHAR,
170 : 0 /* end marker */
171 : };
172 :
173 : /*
174 : * The order of this table is important -- it is also referenced by
175 : * the command line processor to allow run-time overriding of the
176 : * built-in size values. The order must not be changed:
177 : * char, short, int, long, float, double (func pointer)
178 : */
179 : SIZES size_table[] = {
180 : { T_CHAR, S_CHAR, S_PCHAR }, /* char */
181 : { T_SHORT, S_SINT, S_PSINT }, /* short int */
182 : { T_INT, S_INT, S_PINT }, /* int */
183 : { T_LONG, S_LINT, S_PLINT }, /* long */
184 : { T_FLOAT, S_FLOAT, S_PFLOAT }, /* float */
185 : { T_DOUBLE, S_DOUBLE, S_PDOUBLE }, /* double */
186 : { T_FPTR, 0, S_PFPTR }, /* int (*()) */
187 : { 0, 0, 0 }, /* End of table */
188 : };
189 :
190 0 : void InitCpp5()
191 : {
192 :
193 0 : }
194 :
195 :
196 :
197 : int
198 0 : eval()
199 : /*
200 : * Evaluate an expression. Straight-forward operator precedence.
201 : * This is called from control() on encountering an #if statement.
202 : * It calls the following routines:
203 : * evallex Lexical analyser -- returns the type and value of
204 : * the next input token.
205 : * evaleval Evaluate the current operator, given the values on
206 : * the value stack. Returns a pointer to the (new)
207 : * value stack.
208 : * For compatiblity with older cpp's, this return returns 1 (TRUE)
209 : * if a syntax error is detected.
210 : */
211 : {
212 : register int op; /* Current operator */
213 : register int *valp; /* -> value vector */
214 : register OPTAB *opp; /* Operator stack */
215 : int prec; /* Op precedence */
216 : int binop; /* Set if binary op. needed */
217 : int op1; /* Operand from stack */
218 : int skip; /* For short-circuit testing */
219 : int value[NEXP]; /* Value stack */
220 : OPTAB opstack[NEXP]; /* Operand stack */
221 : extern int *evaleval(); /* Does actual evaluation */
222 0 : valp = value;
223 0 : opp = opstack;
224 0 : opp->op = OP_END; /* Mark bottom of stack */
225 0 : opp->prec = opdope[OP_END]; /* And its precedence */
226 0 : opp->skip = 0; /* Not skipping now */
227 0 : binop = 0;
228 : again: ;
229 : #ifdef DEBUG_EVAL
230 : fprintf( pCppOut, "In #if at again: skip = %d, binop = %d, line is: %s",
231 : opp->skip, binop, infile->bptr);
232 : #endif
233 0 : if ((op = evallex(opp->skip)) == OP_SUB && binop == 0)
234 0 : op = OP_NEG; /* Unary minus */
235 0 : else if (op == OP_ADD && binop == 0)
236 0 : op = OP_PLU; /* Unary plus */
237 0 : else if (op == OP_FAIL)
238 0 : return (1); /* Error in evallex */
239 : #ifdef DEBUG_EVAL
240 : fprintf( pCppOut, "op = %s, opdope = %03o, binop = %d, skip = %d\n",
241 : opname[op], opdope[op], binop, opp->skip);
242 : #endif
243 0 : if (op == DIG) { /* Value? */
244 0 : if (binop != 0) {
245 0 : cerror("misplaced constant in #if", NULLST);
246 0 : return (1);
247 : }
248 0 : else if (valp >= &value[NEXP-1]) {
249 0 : cerror("#if value stack overflow", NULLST);
250 0 : return (1);
251 : }
252 : else {
253 : #ifdef DEBUG_EVAL
254 : fprintf( pCppOut, "pushing %d onto value stack[%d]\n",
255 : evalue, valp - value);
256 : #endif
257 0 : *valp++ = evalue;
258 0 : binop = 1;
259 : }
260 0 : goto again;
261 : }
262 0 : else if (op > OP_END) {
263 0 : cerror("Illegal #if line", NULLST);
264 0 : return (1);
265 : }
266 0 : prec = opdope[op];
267 0 : if (binop != (prec & 1)) {
268 0 : cerror("Operator %s in incorrect context", opname[op]);
269 0 : return (1);
270 : }
271 0 : binop = (prec & 2) >> 1;
272 : for (;;) {
273 : #ifdef DEBUG_EVAL
274 : fprintf( pCppOut, "op %s, prec %d., stacked op %s, prec %d, skip %d\n",
275 : opname[op], prec, opname[opp->op], opp->prec, opp->skip);
276 : #endif
277 0 : if (prec > opp->prec) {
278 0 : if (op == OP_LPA)
279 0 : prec = OP_RPA_PREC;
280 0 : else if (op == OP_QUE)
281 0 : prec = OP_QUE_PREC;
282 0 : op1 = opp->skip; /* Save skip for test */
283 : /*
284 : * Push operator onto op. stack.
285 : */
286 0 : opp++;
287 0 : if (opp >= &opstack[NEXP]) {
288 0 : cerror("expression stack overflow at op \"%s\"",
289 : opname[op]);
290 0 : return (1);
291 : }
292 0 : opp->op = (char)op;
293 0 : opp->prec = (char)prec;
294 0 : skip = (valp[-1] != 0); /* Short-circuit tester */
295 : /*
296 : * Do the short-circuit stuff here. Short-circuiting
297 : * stops automagically when operators are evaluated.
298 : */
299 0 : if ((op == OP_ANA && !skip)
300 0 : || (op == OP_ORO && skip))
301 0 : opp->skip = S_ANDOR; /* And/or skip starts */
302 0 : else if (op == OP_QUE) /* Start of ?: operator */
303 0 : opp->skip = (char)((op1 & S_ANDOR) | ((!skip) ? S_QUEST : 0));
304 0 : else if (op == OP_COL) { /* : inverts S_QUEST */
305 0 : opp->skip = (char)((op1 & S_ANDOR)
306 0 : | (((op1 & S_QUEST) != 0) ? 0 : S_QUEST));
307 : }
308 : else { /* Other ops leave */
309 0 : opp->skip = (char)op1; /* skipping unchanged. */
310 : }
311 : #ifdef DEBUG_EVAL
312 : fprintf( pCppOut, "stacking %s, valp[-1] == %d at %s",
313 : opname[op], valp[-1], infile->bptr);
314 : dumpstack(opstack, opp, value, valp);
315 : #endif
316 0 : goto again;
317 : }
318 : /*
319 : * Pop operator from op. stack and evaluate it.
320 : * End of stack and '(' are specials.
321 : */
322 0 : skip = opp->skip; /* Remember skip value */
323 0 : switch ((op1 = opp->op)) { /* Look at stacked op */
324 : case OP_END: /* Stack end marker */
325 0 : if (op == OP_EOE)
326 0 : return (valp[-1]); /* Finished ok. */
327 0 : goto again; /* Read another op. */
328 :
329 : case OP_LPA: /* ( on stack */
330 0 : if (op != OP_RPA) { /* Matches ) on input */
331 0 : cerror("unbalanced paren's, op is \"%s\"", opname[op]);
332 0 : return (1);
333 : }
334 0 : opp--; /* Unstack it */
335 : /* goto again; -- Fall through */
336 :
337 : case OP_QUE:
338 0 : goto again; /* Evaluate true expr. */
339 :
340 : case OP_COL: /* : on stack. */
341 0 : opp--; /* Unstack : */
342 0 : if (opp->op != OP_QUE) { /* Matches ? on stack? */
343 0 : cerror("Misplaced '?' or ':', previous operator is %s",
344 0 : opname[(int)opp->op]);
345 0 : return (1);
346 : }
347 : /*
348 : * Evaluate op1.
349 : */
350 : default: /* Others: */
351 0 : opp--; /* Unstack the operator */
352 : #ifdef DEBUG_EVAL
353 : fprintf( pCppOut, "Stack before evaluation of %s\n", opname[op1]);
354 : dumpstack(opstack, opp, value, valp);
355 : #endif
356 0 : valp = evaleval(valp, op1, skip);
357 : #ifdef DEBUG_EVAL
358 : fprintf( pCppOut, "Stack after evaluation\n");
359 : dumpstack(opstack, opp, value, valp);
360 : #endif
361 : } /* op1 switch end */
362 0 : } /* Stack unwind loop */
363 : }
364 :
365 : FILE_LOCAL int
366 0 : evallex(int skip)
367 : /*
368 : * Return next eval operator or value. Called from eval(). It
369 : * calls a special-purpose routines for 'char' strings and
370 : * numeric values:
371 : * evalchar called to evaluate 'x'
372 : * evalnum called to evaluate numbers.
373 : */
374 : {
375 : register int c, c1, t;
376 :
377 : again: do { /* Collect the token */
378 0 : c = skipws();
379 0 : if ((c = macroid(c)) == EOF_CHAR || c == '\n') {
380 0 : unget();
381 0 : return (OP_EOE); /* End of expression */
382 : }
383 0 : } while ((t = type[c]) == LET && catenate());
384 0 : if (t == INV) { /* Total nonsense */
385 0 : if (!skip) {
386 0 : if (isascii(c) && isprint(c))
387 0 : cierror("illegal character '%c' in #if", c);
388 : else
389 0 : cierror("illegal character (%d decimal) in #if", c);
390 : }
391 0 : return (OP_FAIL);
392 : }
393 0 : else if (t == QUO) { /* ' or " */
394 0 : if (c == '\'') { /* Character constant */
395 0 : evalue = evalchar(skip); /* Somewhat messy */
396 : #ifdef DEBUG_EVAL
397 : fprintf( pCppOut, "evalchar returns %d.\n", evalue);
398 : #endif
399 0 : return (DIG); /* Return a value */
400 : }
401 0 : cerror("Can't use a string in an #if", NULLST);
402 0 : return (OP_FAIL);
403 : }
404 0 : else if (t == LET) { /* ID must be a macro */
405 0 : if (streq(token, "defined")) { /* Or defined name */
406 0 : c1 = c = skipws();
407 0 : if (c == '(') /* Allow defined(name) */
408 0 : c = skipws();
409 0 : if (type[c] == LET) {
410 0 : evalue = (lookid(c) != NULL);
411 0 : if (c1 != '(' /* Need to balance */
412 0 : || skipws() == ')') /* Did we balance? */
413 0 : return (DIG); /* Parsed ok */
414 : }
415 0 : cerror("Bad #if ... defined() syntax", NULLST);
416 0 : return (OP_FAIL);
417 : }
418 0 : else if (streq(token, "sizeof")) /* New sizeof hackery */
419 0 : return (dosizeof()); /* Gets own routine */
420 : /*
421 : * The Draft ANSI C Standard says that an undefined symbol
422 : * in an #if has the value zero. We are a bit pickier,
423 : * warning except where the programmer was careful to write
424 : * #if defined(foo) ? foo : 0
425 : */
426 : #ifdef STRICT_UNDEF
427 : if (!skip)
428 : cwarn("undefined symbol \"%s\" in #if, 0 used", token);
429 : #endif
430 0 : evalue = 0;
431 0 : return (DIG);
432 : }
433 0 : else if (t == DIG) { /* Numbers are harder */
434 0 : evalue = evalnum(c);
435 : #ifdef DEBUG_EVAL
436 : fprintf( pCppOut, "evalnum returns %d.\n", evalue);
437 : #endif
438 : }
439 0 : else if (strchr("!=<>&|\\", c) != NULL) {
440 : /*
441 : * Process a possible multi-byte lexeme.
442 : */
443 0 : c1 = cget(); /* Peek at next char */
444 0 : switch (c) {
445 : case '!':
446 0 : if (c1 == '=')
447 0 : return (OP_NE);
448 0 : break;
449 :
450 : case '=':
451 0 : if (c1 != '=') { /* Can't say a=b in #if */
452 0 : unget();
453 0 : cerror("= not allowed in #if", NULLST);
454 0 : return (OP_FAIL);
455 : }
456 0 : return (OP_EQ);
457 :
458 : case '>':
459 : case '<':
460 0 : if (c1 == c)
461 0 : return ((c == '<') ? OP_ASL : OP_ASR);
462 0 : else if (c1 == '=')
463 0 : return ((c == '<') ? OP_LE : OP_GE);
464 0 : break;
465 :
466 : case '|':
467 : case '&':
468 0 : if (c1 == c)
469 0 : return ((c == '|') ? OP_ORO : OP_ANA);
470 0 : break;
471 :
472 : case '\\':
473 0 : if (c1 == '\n') /* Multi-line if */
474 0 : goto again;
475 0 : cerror("Unexpected \\ in #if", NULLST);
476 0 : return (OP_FAIL);
477 : }
478 0 : unget();
479 : }
480 0 : return (t);
481 : }
482 :
483 : FILE_LOCAL int
484 0 : dosizeof()
485 : /*
486 : * Process the sizeof (basic type) operation in an #if string.
487 : * Sets evalue to the size and returns
488 : * DIG success
489 : * OP_FAIL bad parse or something.
490 : */
491 : {
492 : register int c;
493 : register TYPES *tp;
494 : register SIZES *sizp;
495 : register short *testp;
496 : short typecode;
497 :
498 0 : if ((c = skipws()) != '(')
499 0 : goto nogood;
500 : /*
501 : * Scan off the tokens.
502 : */
503 0 : typecode = 0;
504 0 : while (0 != (c = skipws())) {
505 0 : if ((c = macroid(c)) == EOF_CHAR || c == '\n')
506 : goto nogood; /* End of line is a bug */
507 0 : else if (c == '(') { /* thing (*)() func ptr */
508 0 : if (skipws() == '*'
509 0 : && skipws() == ')') { /* We found (*) */
510 0 : if (skipws() != '(') /* Let () be optional */
511 0 : unget();
512 0 : else if (skipws() != ')')
513 0 : goto nogood;
514 0 : typecode |= T_FPTR; /* Function pointer */
515 : }
516 : else { /* Junk is a bug */
517 : goto nogood;
518 : }
519 : }
520 0 : else if (type[c] != LET) /* Exit if not a type */
521 0 : break;
522 0 : else if (!catenate()) { /* Maybe combine tokens */
523 : /*
524 : * Look for this unexpandable token in basic_types.
525 : * The code accepts "int long" as well as "long int"
526 : * which is a minor bug as bugs go (and one shared with
527 : * a lot of C compilers).
528 : */
529 0 : for (tp = basic_types; tp->name != NULLST; tp++) {
530 0 : if (streq(token, tp->name))
531 0 : break;
532 : }
533 0 : if (tp->name == NULLST) {
534 0 : cerror("#if sizeof, unknown type \"%s\"", token);
535 0 : return (OP_FAIL);
536 : }
537 0 : typecode |= tp->type; /* Or in the type bit */
538 : }
539 : }
540 : /*
541 : * We are at the end of the type scan. Chew off '*' if necessary.
542 : */
543 0 : if (c == '*') {
544 0 : typecode |= T_PTR;
545 0 : c = skipws();
546 : }
547 0 : if (c == ')') { /* Last syntax check */
548 0 : for (testp = test_table; *testp != 0; testp++) {
549 0 : if (!bittest(typecode & *testp)) {
550 0 : cerror("#if ... sizeof: illegal type combination", NULLST);
551 0 : return (OP_FAIL);
552 : }
553 : }
554 : /*
555 : * We assume that all function pointers are the same size:
556 : * sizeof (int (*)()) == sizeof (float (*)())
557 : * We assume that signed and unsigned don't change the size:
558 : * sizeof (signed int) == (sizeof unsigned int)
559 : */
560 0 : if ((typecode & T_FPTR) != 0) /* Function pointer */
561 0 : typecode = T_FPTR | T_PTR;
562 : else { /* Var or var * datum */
563 0 : typecode &= ~(T_SIGNED | T_UNSIGNED);
564 0 : if ((typecode & (T_SHORT | T_LONG)) != 0)
565 0 : typecode &= ~T_INT;
566 : }
567 0 : if ((typecode & ~T_PTR) == 0) {
568 0 : cerror("#if sizeof() error, no type specified", NULLST);
569 0 : return (OP_FAIL);
570 : }
571 : /*
572 : * Exactly one bit (and possibly T_PTR) may be set.
573 : */
574 0 : for (sizp = size_table; sizp->bits != 0; sizp++) {
575 0 : if ((typecode & ~T_PTR) == sizp->bits) {
576 0 : evalue = ((typecode & T_PTR) != 0)
577 0 : ? sizp->psize : sizp->size;
578 0 : return (DIG);
579 : }
580 : } /* We shouldn't fail */
581 0 : cierror("#if ... sizeof: bug, unknown type code 0x%x", typecode);
582 0 : return (OP_FAIL);
583 : }
584 :
585 0 : nogood: unget();
586 0 : cerror("#if ... sizeof() syntax error", NULLST);
587 0 : return (OP_FAIL);
588 : }
589 :
590 : FILE_LOCAL int
591 0 : bittest(int value)
592 : /*
593 : * TRUE if value is zero or exactly one bit is set in value.
594 : */
595 : {
596 : #if (4096 & ~(-4096)) == 0
597 0 : return ((value & ~(-value)) == 0);
598 : #else
599 : /*
600 : * Do it the hard way (for non 2's complement machines)
601 : */
602 : return (value == 0 || value ^ (value - 1) == (value * 2 - 1));
603 : #endif
604 : }
605 :
606 : FILE_LOCAL int
607 0 : evalnum(int c)
608 : /*
609 : * Expand number for #if lexical analysis. Note: evalnum recognizes
610 : * the unsigned suffix, but only returns a signed int value.
611 : */
612 : {
613 : register int value;
614 : register int base;
615 : register int c1;
616 :
617 0 : if (c != '0')
618 0 : base = 10;
619 0 : else if ((c = cget()) == 'x' || c == 'X') {
620 0 : base = 16;
621 0 : c = cget();
622 : }
623 0 : else base = 8;
624 0 : value = 0;
625 : for (;;) {
626 0 : c1 = c;
627 0 : if (isascii(c) && isupper(c1))
628 0 : c1 = tolower(c1);
629 : #ifdef EBCDIC
630 : if (c1 <= 'f')
631 : #else
632 0 : if (c1 >= 'a')
633 : #endif
634 0 : c1 -= ('a' - 10);
635 0 : else c1 -= '0';
636 0 : if (c1 < 0 || c1 >= base)
637 : break;
638 0 : value *= base;
639 0 : value += c1;
640 0 : c = cget();
641 0 : }
642 0 : if (c == 'u' || c == 'U') /* Unsigned nonsense */
643 0 : cget();
644 0 : unget();
645 0 : return (value);
646 : }
647 :
648 : FILE_LOCAL int
649 0 : evalchar(int skip)
650 : /*
651 : * Get a character constant
652 : */
653 : {
654 : register int c;
655 : register int value;
656 : register int count;
657 :
658 0 : instring = TRUE;
659 0 : if ((c = cget()) == '\\') {
660 0 : switch ((c = cget())) {
661 : case 'a': /* New in Standard */
662 : #if ('a' == '\a' || '\a' == ALERT)
663 0 : value = ALERT; /* Use predefined value */
664 : #else
665 : value = '\a'; /* Use compiler's value */
666 : #endif
667 0 : break;
668 :
669 : case 'b':
670 0 : value = '\b';
671 0 : break;
672 :
673 : case 'f':
674 0 : value = '\f';
675 0 : break;
676 :
677 : case 'n':
678 0 : value = '\n';
679 0 : break;
680 :
681 : case 'r':
682 0 : value = '\r';
683 0 : break;
684 :
685 : case 't':
686 0 : value = '\t';
687 0 : break;
688 :
689 : case 'v': /* New in Standard */
690 : #if ('v' == '\v' || '\v' == VT)
691 0 : value = VT; /* Use predefined value */
692 : #else
693 : value = '\v'; /* Use compiler's value */
694 : #endif
695 0 : break;
696 :
697 : case 'x': /* '\xFF' */
698 0 : count = 3;
699 0 : value = 0;
700 0 : while ((((c = get()) >= '0' && c <= '9')
701 0 : || (c >= 'a' && c <= 'f')
702 0 : || (c >= 'A' && c <= 'F'))
703 0 : && (--count >= 0)) {
704 0 : value *= 16;
705 : #ifdef EBCDIC
706 : value += (c <= '9') ? (c - '0') : ((c & 0xF) + 9);
707 : #else
708 0 : value += (c >= '0') ? (c - '0') : ((c & 0xF) + 9);
709 : #endif
710 : }
711 0 : unget();
712 0 : break;
713 :
714 : default:
715 0 : if (c >= '0' && c <= '7') {
716 0 : count = 3;
717 0 : value = 0;
718 0 : while (c >= '0' && c <= '7' && --count >= 0) {
719 0 : value *= 8;
720 0 : value += (c - '0');
721 0 : c = get();
722 : }
723 0 : unget();
724 : }
725 0 : else value = c;
726 0 : break;
727 : }
728 : }
729 0 : else if (c == '\'')
730 0 : value = 0;
731 0 : else value = c;
732 : /*
733 : * We warn on multi-byte constants and try to hack
734 : * (big|little)endian machines.
735 : */
736 0 : while ((c = get()) != '\'' && c != EOF_CHAR && c != '\n') {
737 0 : if (!skip)
738 0 : ciwarn("multi-byte constant '%c' isn't portable", c);
739 0 : value <<= BITS_CHAR;
740 0 : value += c;
741 : }
742 0 : instring = FALSE;
743 0 : return (value);
744 : }
745 :
746 : FILE_LOCAL int *
747 0 : evaleval(int* valp, int op, int skip)
748 : /*
749 : * Apply the argument operator to the data on the value stack.
750 : * One or two values are popped from the value stack and the result
751 : * is pushed onto the value stack.
752 : *
753 : * OP_COL is a special case.
754 : *
755 : * evaleval() returns the new pointer to the top of the value stack.
756 : */
757 : {
758 0 : register int v1, v2 = 0;
759 :
760 0 : if (isbinary(op))
761 0 : v2 = *--valp;
762 0 : v1 = *--valp;
763 : #ifdef DEBUG_EVAL
764 : fprintf( pCppOut, "%s op %s", (isbinary(op)) ? "binary" : "unary",
765 : opname[op]);
766 : if (isbinary(op))
767 : fprintf( pCppOut, ", v2 = %d.", v2);
768 : fprintf( pCppOut, ", v1 = %d.\n", v1);
769 : #endif
770 0 : switch (op) {
771 : case OP_EOE:
772 0 : break;
773 :
774 : case OP_ADD:
775 0 : v1 += v2;
776 0 : break;
777 :
778 : case OP_SUB:
779 0 : v1 -= v2;
780 0 : break;
781 :
782 : case OP_MUL:
783 0 : v1 *= v2;
784 0 : break;
785 :
786 : case OP_DIV:
787 : case OP_MOD:
788 0 : if (v2 == 0) {
789 0 : if (!skip) {
790 0 : cwarn("%s by zero in #if, zero result assumed",
791 : (op == OP_DIV) ? "divide" : "mod");
792 : }
793 0 : v1 = 0;
794 : }
795 0 : else if (op == OP_DIV)
796 0 : v1 /= v2;
797 : else
798 0 : v1 %= v2;
799 0 : break;
800 :
801 : case OP_ASL:
802 0 : v1 <<= v2;
803 0 : break;
804 :
805 : case OP_ASR:
806 0 : v1 >>= v2;
807 0 : break;
808 :
809 : case OP_AND:
810 0 : v1 &= v2;
811 0 : break;
812 :
813 : case OP_OR:
814 0 : v1 |= v2;
815 0 : break;
816 :
817 : case OP_XOR:
818 0 : v1 ^= v2;
819 0 : break;
820 :
821 : case OP_EQ:
822 0 : v1 = (v1 == v2);
823 0 : break;
824 :
825 : case OP_NE:
826 0 : v1 = (v1 != v2);
827 0 : break;
828 :
829 : case OP_LT:
830 0 : v1 = (v1 < v2);
831 0 : break;
832 :
833 : case OP_LE:
834 0 : v1 = (v1 <= v2);
835 0 : break;
836 :
837 : case OP_GE:
838 0 : v1 = (v1 >= v2);
839 0 : break;
840 :
841 : case OP_GT:
842 0 : v1 = (v1 > v2);
843 0 : break;
844 :
845 : case OP_ANA:
846 0 : v1 = (v1 && v2);
847 0 : break;
848 :
849 : case OP_ORO:
850 0 : v1 = (v1 || v2);
851 0 : break;
852 :
853 : case OP_COL:
854 : /*
855 : * v1 has the "true" value, v2 the "false" value.
856 : * The top of the value stack has the test.
857 : */
858 0 : v1 = (*--valp) ? v1 : v2;
859 0 : break;
860 :
861 : case OP_NEG:
862 0 : v1 = (-v1);
863 0 : break;
864 :
865 : case OP_PLU:
866 0 : break;
867 :
868 : case OP_COM:
869 0 : v1 = ~v1;
870 0 : break;
871 :
872 : case OP_NOT:
873 0 : v1 = !v1;
874 0 : break;
875 :
876 : default:
877 0 : cierror("#if bug, operand = %d.", op);
878 0 : v1 = 0;
879 : }
880 0 : *valp++ = v1;
881 0 : return (valp);
882 : }
883 :
884 : #ifdef DEBUG_EVAL
885 : dumpstack(opstack, opp, value, valp)
886 : OPTAB opstack[NEXP]; /* Operand stack */
887 : register OPTAB *opp; /* Operator stack */
888 : int value[NEXP]; /* Value stack */
889 : register int *valp; /* -> value vector */
890 : {
891 : fprintf( pCppOut, "index op prec skip name -- op stack at %s", infile->bptr);
892 : while (opp > opstack) {
893 : fprintf( pCppOut, " [%2d] %2d %03o %d %s\n", opp - opstack,
894 : opp->op, opp->prec, opp->skip, opname[opp->op]);
895 : opp--;
896 : }
897 : while (--valp >= value) {
898 : fprintf( pCppOut, "value[%d] = %d\n", (valp - value), *valp);
899 : }
900 : }
901 : #endif
902 :
903 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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