1 |
greg |
1.1 |
/* Copyright (c) 1986 Regents of the University of California */ |
2 |
|
|
|
3 |
|
|
#ifndef lint |
4 |
|
|
static char SCCSid[] = "$SunId$ LBL"; |
5 |
|
|
#endif |
6 |
|
|
|
7 |
|
|
/* |
8 |
|
|
* Compute data values using expression parser |
9 |
|
|
* |
10 |
|
|
* 7/1/85 Greg Ward |
11 |
|
|
* |
12 |
|
|
* 11/11/85 Made channel input conditional with (INCHAN) compiles. |
13 |
|
|
* |
14 |
|
|
* 4/2/86 Added conditional compiles for function definitions (FUNCTION). |
15 |
|
|
* |
16 |
|
|
* 1/29/87 Made variables conditional (VARIABLE) |
17 |
|
|
* |
18 |
|
|
* 5/19/88 Added constant subexpression elimination (RCONST) |
19 |
|
|
*/ |
20 |
|
|
|
21 |
|
|
#include <stdio.h> |
22 |
|
|
|
23 |
|
|
#include <ctype.h> |
24 |
|
|
|
25 |
|
|
#include <errno.h> |
26 |
|
|
|
27 |
|
|
#include "calcomp.h" |
28 |
|
|
|
29 |
|
|
#define MAXLINE 256 /* maximum line length */ |
30 |
|
|
#define MAXWORD 64 /* maximum word length */ |
31 |
|
|
|
32 |
|
|
#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
33 |
|
|
|
34 |
|
|
#define isid(c) (isalnum(c) || (c) == '_' || (c) == '.') |
35 |
|
|
|
36 |
|
|
#define isdecimal(c) (isdigit(c) || (c) == '.') |
37 |
|
|
|
38 |
|
|
extern double atof(), pow(); |
39 |
|
|
extern char *fgets(), *savestr(); |
40 |
|
|
extern char *emalloc(), *ecalloc(); |
41 |
|
|
extern EPNODE *curfunc; |
42 |
|
|
extern double efunc(), evariable(), enumber(), euminus(), echannel(); |
43 |
|
|
extern double eargument(), eadd(), esubtr(), emult(), edivi(), epow(); |
44 |
|
|
extern double ebotch(); |
45 |
|
|
extern int errno; |
46 |
|
|
|
47 |
|
|
int nextc; /* lookahead character */ |
48 |
|
|
|
49 |
|
|
double (*eoper[])() = { /* expression operations */ |
50 |
|
|
ebotch, |
51 |
|
|
#ifdef VARIABLE |
52 |
|
|
evariable, |
53 |
|
|
#else |
54 |
|
|
ebotch, |
55 |
|
|
#endif |
56 |
|
|
enumber, |
57 |
|
|
euminus, |
58 |
|
|
#ifdef INCHAN |
59 |
|
|
echannel, |
60 |
|
|
#else |
61 |
|
|
ebotch, |
62 |
|
|
#endif |
63 |
|
|
#ifdef FUNCTION |
64 |
|
|
efunc, |
65 |
|
|
eargument, |
66 |
|
|
#else |
67 |
|
|
ebotch, |
68 |
|
|
ebotch, |
69 |
|
|
#endif |
70 |
|
|
ebotch, |
71 |
|
|
ebotch, |
72 |
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
73 |
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
74 |
|
|
emult, |
75 |
|
|
eadd, |
76 |
|
|
0, |
77 |
|
|
esubtr, |
78 |
|
|
0, |
79 |
|
|
edivi, |
80 |
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0, |
81 |
|
|
ebotch, |
82 |
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
83 |
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
84 |
|
|
epow, |
85 |
|
|
}; |
86 |
|
|
|
87 |
|
|
static char *infile; /* input file name */ |
88 |
|
|
static FILE *infp; /* input file pointer */ |
89 |
|
|
static char *linbuf; /* line buffer */ |
90 |
|
|
static int linepos; /* position in buffer */ |
91 |
|
|
|
92 |
|
|
|
93 |
|
|
EPNODE * |
94 |
|
|
eparse(expr) /* parse an expression string */ |
95 |
|
|
char *expr; |
96 |
|
|
{ |
97 |
|
|
EPNODE *ep; |
98 |
|
|
|
99 |
|
|
initstr(NULL, expr); |
100 |
|
|
#if defined(VARIABLE) && defined(FUNCTION) |
101 |
|
|
curfunc = NULL; |
102 |
|
|
#endif |
103 |
|
|
ep = getE1(); |
104 |
|
|
if (nextc != EOF) |
105 |
|
|
syntax("unexpected character"); |
106 |
|
|
return(ep); |
107 |
|
|
} |
108 |
|
|
|
109 |
|
|
|
110 |
|
|
double |
111 |
|
|
eval(expr) /* evaluate an expression string */ |
112 |
|
|
char *expr; |
113 |
|
|
{ |
114 |
|
|
register EPNODE *ep; |
115 |
|
|
double rval; |
116 |
|
|
|
117 |
|
|
ep = eparse(expr); |
118 |
|
|
rval = evalue(ep); |
119 |
|
|
epfree(ep); |
120 |
|
|
return(rval); |
121 |
|
|
} |
122 |
|
|
|
123 |
|
|
|
124 |
|
|
epfree(epar) /* free a parse tree */ |
125 |
|
|
register EPNODE *epar; |
126 |
|
|
{ |
127 |
|
|
register EPNODE *ep; |
128 |
|
|
|
129 |
|
|
switch (epar->type) { |
130 |
|
|
|
131 |
greg |
1.2 |
#if defined(VARIABLE) || defined(FUNCTION) |
132 |
greg |
1.1 |
case VAR: |
133 |
|
|
varfree(epar->v.ln); |
134 |
|
|
break; |
135 |
greg |
1.2 |
#endif |
136 |
greg |
1.1 |
|
137 |
|
|
case SYM: |
138 |
|
|
freestr(epar->v.name); |
139 |
|
|
break; |
140 |
|
|
|
141 |
|
|
case NUM: |
142 |
|
|
case CHAN: |
143 |
|
|
case ARG: |
144 |
|
|
case TICK: |
145 |
|
|
break; |
146 |
|
|
|
147 |
|
|
default: |
148 |
|
|
for (ep = epar->v.kid; ep != NULL; ep = ep->sibling) |
149 |
|
|
epfree(ep); |
150 |
|
|
break; |
151 |
|
|
|
152 |
|
|
} |
153 |
|
|
|
154 |
|
|
efree((char *)epar); |
155 |
|
|
} |
156 |
|
|
|
157 |
|
|
/* the following used to be a switch */ |
158 |
|
|
#ifdef FUNCTION |
159 |
|
|
static double |
160 |
|
|
eargument(ep) |
161 |
|
|
EPNODE *ep; |
162 |
|
|
{ |
163 |
|
|
return(argument(ep->v.chan)); |
164 |
|
|
} |
165 |
|
|
#endif |
166 |
|
|
|
167 |
|
|
static double |
168 |
|
|
enumber(ep) |
169 |
|
|
EPNODE *ep; |
170 |
|
|
{ |
171 |
|
|
return(ep->v.num); |
172 |
|
|
} |
173 |
|
|
|
174 |
|
|
static double |
175 |
|
|
euminus(ep) |
176 |
|
|
EPNODE *ep; |
177 |
|
|
{ |
178 |
|
|
register EPNODE *ep1 = ep->v.kid; |
179 |
|
|
|
180 |
|
|
return(-evalue(ep1)); |
181 |
|
|
} |
182 |
|
|
|
183 |
|
|
#ifdef INCHAN |
184 |
|
|
static double |
185 |
|
|
echannel(ep) |
186 |
|
|
EPNODE *ep; |
187 |
|
|
{ |
188 |
|
|
return(chanvalue(ep->v.chan)); |
189 |
|
|
} |
190 |
|
|
#endif |
191 |
|
|
|
192 |
|
|
static double |
193 |
|
|
eadd(ep) |
194 |
|
|
EPNODE *ep; |
195 |
|
|
{ |
196 |
|
|
register EPNODE *ep1 = ep->v.kid; |
197 |
|
|
|
198 |
|
|
return(evalue(ep1) + evalue(ep1->sibling)); |
199 |
|
|
} |
200 |
|
|
|
201 |
|
|
static double |
202 |
|
|
esubtr(ep) |
203 |
|
|
EPNODE *ep; |
204 |
|
|
{ |
205 |
|
|
register EPNODE *ep1 = ep->v.kid; |
206 |
|
|
|
207 |
|
|
return(evalue(ep1) - evalue(ep1->sibling)); |
208 |
|
|
} |
209 |
|
|
|
210 |
|
|
static double |
211 |
|
|
emult(ep) |
212 |
|
|
EPNODE *ep; |
213 |
|
|
{ |
214 |
|
|
register EPNODE *ep1 = ep->v.kid; |
215 |
|
|
|
216 |
|
|
return(evalue(ep1) * evalue(ep1->sibling)); |
217 |
|
|
} |
218 |
|
|
|
219 |
|
|
static double |
220 |
|
|
edivi(ep) |
221 |
|
|
EPNODE *ep; |
222 |
|
|
{ |
223 |
|
|
register EPNODE *ep1 = ep->v.kid; |
224 |
|
|
double d; |
225 |
|
|
|
226 |
|
|
d = evalue(ep1->sibling); |
227 |
|
|
if (d == 0.0) { |
228 |
|
|
wputs("Division by zero\n"); |
229 |
|
|
errno = ERANGE; |
230 |
|
|
return(0.0); |
231 |
|
|
} |
232 |
|
|
return(evalue(ep1) / d); |
233 |
|
|
} |
234 |
|
|
|
235 |
|
|
static double |
236 |
|
|
epow(ep) |
237 |
|
|
EPNODE *ep; |
238 |
|
|
{ |
239 |
|
|
register EPNODE *ep1 = ep->v.kid; |
240 |
|
|
double d; |
241 |
|
|
int lasterrno; |
242 |
|
|
|
243 |
|
|
lasterrno = errno; |
244 |
|
|
errno = 0; |
245 |
|
|
d = pow(evalue(ep1), evalue(ep1->sibling)); |
246 |
|
|
#ifdef IEEE |
247 |
|
|
if (!finite(d)) |
248 |
|
|
errno = EDOM; |
249 |
|
|
#endif |
250 |
|
|
if (errno) { |
251 |
|
|
wputs("Illegal power\n"); |
252 |
|
|
return(0.0); |
253 |
|
|
} |
254 |
|
|
errno = lasterrno; |
255 |
|
|
return(d); |
256 |
|
|
} |
257 |
|
|
|
258 |
|
|
static double |
259 |
|
|
ebotch(ep) |
260 |
|
|
EPNODE *ep; |
261 |
|
|
{ |
262 |
|
|
eputs("Bad expression!\n"); |
263 |
|
|
quit(1); |
264 |
|
|
} |
265 |
|
|
|
266 |
|
|
|
267 |
|
|
EPNODE * |
268 |
|
|
ekid(ep, n) /* return pointer to a node's nth kid */ |
269 |
|
|
register EPNODE *ep; |
270 |
|
|
register int n; |
271 |
|
|
{ |
272 |
|
|
|
273 |
|
|
for (ep = ep->v.kid; ep != NULL; ep = ep->sibling) |
274 |
|
|
if (--n < 0) |
275 |
|
|
break; |
276 |
|
|
|
277 |
|
|
return(ep); |
278 |
|
|
} |
279 |
|
|
|
280 |
|
|
|
281 |
|
|
int |
282 |
|
|
nekids(ep) /* return # of kids for node ep */ |
283 |
|
|
register EPNODE *ep; |
284 |
|
|
{ |
285 |
|
|
register int n = 0; |
286 |
|
|
|
287 |
|
|
for (ep = ep->v.kid; ep != NULL; ep = ep->sibling) |
288 |
|
|
n++; |
289 |
|
|
|
290 |
|
|
return(n); |
291 |
|
|
} |
292 |
|
|
|
293 |
|
|
|
294 |
|
|
initfile(file, fp) /* prepare input file */ |
295 |
|
|
char *file; |
296 |
|
|
FILE *fp; |
297 |
|
|
{ |
298 |
|
|
static char inpbuf[MAXLINE]; |
299 |
|
|
|
300 |
|
|
infile = file; |
301 |
|
|
infp = fp; |
302 |
|
|
linbuf = inpbuf; |
303 |
|
|
linepos = 0; |
304 |
|
|
inpbuf[0] = '\0'; |
305 |
|
|
scan(); |
306 |
|
|
} |
307 |
|
|
|
308 |
|
|
|
309 |
|
|
initstr(file, s) /* prepare input string */ |
310 |
|
|
char *file; |
311 |
|
|
char *s; |
312 |
|
|
{ |
313 |
|
|
infile = file; |
314 |
|
|
infp = NULL; |
315 |
|
|
linbuf = s; |
316 |
|
|
linepos = 0; |
317 |
|
|
scan(); |
318 |
|
|
} |
319 |
|
|
|
320 |
|
|
|
321 |
|
|
scan() /* scan next character */ |
322 |
|
|
{ |
323 |
|
|
do { |
324 |
|
|
if (linbuf[linepos] == '\0') |
325 |
|
|
if (infp == NULL || fgets(linbuf, MAXLINE, infp) == NULL) |
326 |
|
|
nextc = EOF; |
327 |
|
|
else { |
328 |
|
|
nextc = linbuf[0]; |
329 |
|
|
linepos = 1; |
330 |
|
|
} |
331 |
|
|
else |
332 |
|
|
nextc = linbuf[linepos++]; |
333 |
|
|
if (nextc == '{') { |
334 |
|
|
scan(); |
335 |
|
|
while (nextc != '}') |
336 |
|
|
if (nextc == EOF) |
337 |
|
|
syntax("'}' expected"); |
338 |
|
|
else |
339 |
|
|
scan(); |
340 |
|
|
scan(); |
341 |
|
|
} |
342 |
|
|
} while (isspace(nextc)); |
343 |
|
|
} |
344 |
|
|
|
345 |
|
|
|
346 |
|
|
syntax(err) /* report syntax error and quit */ |
347 |
|
|
char *err; |
348 |
|
|
{ |
349 |
|
|
register int i; |
350 |
|
|
|
351 |
|
|
eputs(linbuf); |
352 |
greg |
1.4 |
if (linbuf[strlen(linbuf)-1] != '\n') |
353 |
greg |
1.1 |
eputs("\n"); |
354 |
|
|
for (i = 0; i < linepos-1; i++) |
355 |
|
|
eputs(linbuf[i] == '\t' ? "\t" : " "); |
356 |
|
|
eputs("^ "); |
357 |
|
|
if (infile != NULL) { |
358 |
|
|
eputs(infile); |
359 |
|
|
eputs(": "); |
360 |
|
|
} |
361 |
|
|
eputs(err); |
362 |
|
|
eputs("\n"); |
363 |
|
|
quit(1); |
364 |
|
|
} |
365 |
|
|
|
366 |
|
|
|
367 |
|
|
addekid(ep, ekid) /* add a child to ep */ |
368 |
|
|
register EPNODE *ep; |
369 |
|
|
EPNODE *ekid; |
370 |
|
|
{ |
371 |
|
|
if (ep->v.kid == NULL) |
372 |
|
|
ep->v.kid = ekid; |
373 |
|
|
else { |
374 |
|
|
for (ep = ep->v.kid; ep->sibling != NULL; ep = ep->sibling) |
375 |
|
|
; |
376 |
|
|
ep->sibling = ekid; |
377 |
|
|
} |
378 |
|
|
ekid->sibling = NULL; |
379 |
|
|
} |
380 |
|
|
|
381 |
|
|
|
382 |
|
|
char * |
383 |
|
|
getname() /* scan an identifier */ |
384 |
|
|
{ |
385 |
|
|
static char str[MAXWORD+1]; |
386 |
|
|
register int i; |
387 |
|
|
|
388 |
|
|
for (i = 0; i < MAXWORD && isid(nextc); i++, scan()) |
389 |
|
|
str[i] = nextc; |
390 |
|
|
str[i] = '\0'; |
391 |
|
|
|
392 |
|
|
return(str); |
393 |
|
|
} |
394 |
|
|
|
395 |
|
|
|
396 |
|
|
int |
397 |
|
|
getinum() /* scan a positive integer */ |
398 |
|
|
{ |
399 |
|
|
register int n; |
400 |
|
|
|
401 |
|
|
n = 0; |
402 |
|
|
while (isdigit(nextc)) { |
403 |
|
|
n = n * 10 + nextc - '0'; |
404 |
|
|
scan(); |
405 |
|
|
} |
406 |
|
|
return(n); |
407 |
|
|
} |
408 |
|
|
|
409 |
|
|
|
410 |
|
|
double |
411 |
|
|
getnum() /* scan a positive float */ |
412 |
|
|
{ |
413 |
|
|
register int i; |
414 |
|
|
char str[MAXWORD+1]; |
415 |
|
|
|
416 |
|
|
i = 0; |
417 |
|
|
while (isdigit(nextc) && i < MAXWORD) { |
418 |
|
|
str[i++] = nextc; |
419 |
|
|
scan(); |
420 |
|
|
} |
421 |
|
|
if (nextc == '.' && i < MAXWORD) { |
422 |
|
|
str[i++] = nextc; |
423 |
|
|
scan(); |
424 |
|
|
while (isdigit(nextc) && i < MAXWORD) { |
425 |
|
|
str[i++] = nextc; |
426 |
|
|
scan(); |
427 |
|
|
} |
428 |
|
|
} |
429 |
|
|
if ((nextc == 'e' || nextc == 'E') && i < MAXWORD) { |
430 |
|
|
str[i++] = nextc; |
431 |
|
|
scan(); |
432 |
|
|
if ((nextc == '-' || nextc == '+') && i < MAXWORD) { |
433 |
|
|
str[i++] = nextc; |
434 |
|
|
scan(); |
435 |
|
|
} |
436 |
|
|
while (isdigit(nextc) && i < MAXWORD) { |
437 |
|
|
str[i++] = nextc; |
438 |
|
|
scan(); |
439 |
|
|
} |
440 |
|
|
} |
441 |
|
|
str[i] = '\0'; |
442 |
|
|
|
443 |
|
|
return(atof(str)); |
444 |
|
|
} |
445 |
|
|
|
446 |
|
|
|
447 |
|
|
EPNODE * |
448 |
|
|
getE1() /* E1 -> E1 ADDOP E2 */ |
449 |
|
|
/* E2 */ |
450 |
|
|
{ |
451 |
|
|
register EPNODE *ep1, *ep2; |
452 |
|
|
|
453 |
|
|
ep1 = getE2(); |
454 |
|
|
while (nextc == '+' || nextc == '-') { |
455 |
|
|
ep2 = newnode(); |
456 |
|
|
ep2->type = nextc; |
457 |
|
|
scan(); |
458 |
|
|
addekid(ep2, ep1); |
459 |
|
|
addekid(ep2, getE2()); |
460 |
|
|
#ifdef RCONST |
461 |
|
|
if (ep1->type == NUM && ep1->sibling->type == NUM) |
462 |
|
|
ep2 = rconst(ep2); |
463 |
|
|
#endif |
464 |
|
|
ep1 = ep2; |
465 |
|
|
} |
466 |
|
|
return(ep1); |
467 |
|
|
} |
468 |
|
|
|
469 |
|
|
|
470 |
|
|
EPNODE * |
471 |
|
|
getE2() /* E2 -> E2 MULOP E3 */ |
472 |
|
|
/* E3 */ |
473 |
|
|
{ |
474 |
|
|
register EPNODE *ep1, *ep2; |
475 |
|
|
|
476 |
|
|
ep1 = getE3(); |
477 |
|
|
while (nextc == '*' || nextc == '/') { |
478 |
|
|
ep2 = newnode(); |
479 |
|
|
ep2->type = nextc; |
480 |
|
|
scan(); |
481 |
|
|
addekid(ep2, ep1); |
482 |
|
|
addekid(ep2, getE3()); |
483 |
|
|
#ifdef RCONST |
484 |
|
|
if (ep1->type == NUM && ep1->sibling->type == NUM) |
485 |
|
|
ep2 = rconst(ep2); |
486 |
|
|
#endif |
487 |
|
|
ep1 = ep2; |
488 |
|
|
} |
489 |
|
|
return(ep1); |
490 |
|
|
} |
491 |
|
|
|
492 |
|
|
|
493 |
|
|
EPNODE * |
494 |
|
|
getE3() /* E3 -> E3 ^ E4 */ |
495 |
|
|
/* E4 */ |
496 |
|
|
{ |
497 |
|
|
register EPNODE *ep1, *ep2; |
498 |
|
|
|
499 |
|
|
ep1 = getE4(); |
500 |
|
|
while (nextc == '^') { |
501 |
|
|
ep2 = newnode(); |
502 |
|
|
ep2->type = nextc; |
503 |
|
|
scan(); |
504 |
|
|
addekid(ep2, ep1); |
505 |
|
|
addekid(ep2, getE4()); |
506 |
|
|
#ifdef RCONST |
507 |
|
|
if (ep1->type == NUM && ep1->sibling->type == NUM) |
508 |
|
|
ep2 = rconst(ep2); |
509 |
|
|
#endif |
510 |
|
|
ep1 = ep2; |
511 |
|
|
} |
512 |
|
|
return(ep1); |
513 |
|
|
} |
514 |
|
|
|
515 |
|
|
|
516 |
|
|
EPNODE * |
517 |
|
|
getE4() /* E4 -> ADDOP E5 */ |
518 |
|
|
/* E5 */ |
519 |
|
|
{ |
520 |
greg |
1.3 |
register EPNODE *ep1, *ep2; |
521 |
greg |
1.1 |
|
522 |
|
|
if (nextc == '-') { |
523 |
|
|
scan(); |
524 |
greg |
1.3 |
ep2 = getE5(); |
525 |
|
|
if (ep2->type == NUM) { |
526 |
|
|
ep2->v.num = -ep2->v.num; |
527 |
|
|
return(ep2); |
528 |
|
|
} |
529 |
greg |
1.1 |
ep1 = newnode(); |
530 |
|
|
ep1->type = UMINUS; |
531 |
greg |
1.3 |
addekid(ep1, ep2); |
532 |
greg |
1.1 |
return(ep1); |
533 |
|
|
} |
534 |
|
|
if (nextc == '+') |
535 |
|
|
scan(); |
536 |
|
|
return(getE5()); |
537 |
|
|
} |
538 |
|
|
|
539 |
|
|
|
540 |
|
|
EPNODE * |
541 |
|
|
getE5() /* E5 -> (E1) */ |
542 |
|
|
/* VAR */ |
543 |
|
|
/* NUM */ |
544 |
|
|
/* $N */ |
545 |
|
|
/* FUNC(E1,..) */ |
546 |
|
|
/* ARG */ |
547 |
|
|
{ |
548 |
|
|
int i; |
549 |
|
|
register EPNODE *ep1, *ep2; |
550 |
|
|
|
551 |
|
|
if (nextc == '(') { |
552 |
|
|
scan(); |
553 |
|
|
ep1 = getE1(); |
554 |
|
|
if (nextc != ')') |
555 |
|
|
syntax("')' expected"); |
556 |
|
|
scan(); |
557 |
|
|
return(ep1); |
558 |
|
|
} |
559 |
|
|
|
560 |
|
|
#ifdef INCHAN |
561 |
|
|
if (nextc == '$') { |
562 |
|
|
scan(); |
563 |
|
|
ep1 = newnode(); |
564 |
|
|
ep1->type = CHAN; |
565 |
|
|
ep1->v.chan = getinum(); |
566 |
|
|
return(ep1); |
567 |
|
|
} |
568 |
|
|
#endif |
569 |
|
|
|
570 |
|
|
#if defined(VARIABLE) || defined(FUNCTION) |
571 |
|
|
if (isalpha(nextc)) { |
572 |
|
|
ep1 = newnode(); |
573 |
|
|
ep1->type = VAR; |
574 |
|
|
ep1->v.ln = varinsert(getname()); |
575 |
|
|
|
576 |
|
|
#if defined(VARIABLE) && defined(FUNCTION) |
577 |
|
|
if (curfunc != NULL) |
578 |
|
|
for (i = 1, ep2 = curfunc->v.kid->sibling; |
579 |
|
|
ep2 != NULL; i++, ep2 = ep2->sibling) |
580 |
|
|
if (!strcmp(ep2->v.name, ep1->v.ln->name)) { |
581 |
|
|
epfree(ep1); |
582 |
|
|
ep1 = newnode(); |
583 |
|
|
ep1->type = ARG; |
584 |
|
|
ep1->v.chan = i; |
585 |
|
|
break; |
586 |
|
|
} |
587 |
|
|
#endif |
588 |
|
|
#ifdef FUNCTION |
589 |
|
|
if (nextc == '(') { |
590 |
|
|
ep2 = newnode(); |
591 |
|
|
ep2->type = FUNC; |
592 |
|
|
addekid(ep2, ep1); |
593 |
|
|
ep1 = ep2; |
594 |
|
|
do { |
595 |
|
|
scan(); |
596 |
|
|
addekid(ep1, getE1()); |
597 |
|
|
} while (nextc == ','); |
598 |
|
|
if (nextc != ')') |
599 |
|
|
syntax("')' expected"); |
600 |
|
|
scan(); |
601 |
|
|
} |
602 |
|
|
#ifndef VARIABLE |
603 |
|
|
else |
604 |
|
|
syntax("'(' expected"); |
605 |
|
|
#endif |
606 |
|
|
#endif |
607 |
|
|
return(ep1); |
608 |
|
|
} |
609 |
|
|
#endif |
610 |
|
|
|
611 |
|
|
if (isdecimal(nextc)) { |
612 |
|
|
ep1 = newnode(); |
613 |
|
|
ep1->type = NUM; |
614 |
|
|
ep1->v.num = getnum(); |
615 |
|
|
return(ep1); |
616 |
|
|
} |
617 |
|
|
syntax("unexpected character"); |
618 |
|
|
} |
619 |
|
|
|
620 |
|
|
|
621 |
|
|
#ifdef RCONST |
622 |
|
|
EPNODE * |
623 |
|
|
rconst(epar) /* reduce a constant expression */ |
624 |
|
|
register EPNODE *epar; |
625 |
|
|
{ |
626 |
|
|
register EPNODE *ep; |
627 |
|
|
|
628 |
|
|
ep = newnode(); |
629 |
|
|
ep->type = NUM; |
630 |
|
|
errno = 0; |
631 |
|
|
ep->v.num = evalue(epar); |
632 |
|
|
if (errno) |
633 |
|
|
syntax("bad constant expression"); |
634 |
|
|
epfree(epar); |
635 |
|
|
|
636 |
|
|
return(ep); |
637 |
|
|
} |
638 |
|
|
#endif |