1 |
greg |
1.1 |
#ifndef lint |
2 |
schorsch |
2.18 |
static const char RCSid[] = "$Id: caldefn.c,v 2.17 2003/07/03 22:41:44 schorsch Exp $"; |
3 |
greg |
1.1 |
#endif |
4 |
|
|
/* |
5 |
|
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* Store variable definitions. |
6 |
|
|
* |
7 |
|
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* 7/1/85 Greg Ward |
8 |
|
|
* |
9 |
|
|
* 11/11/85 Added conditional compiles (OUTCHAN) for control output. |
10 |
|
|
* |
11 |
|
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* 4/2/86 Added conditional compiles for function definitions (FUNCTION). |
12 |
|
|
* |
13 |
|
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* 1/15/88 Added clock for caching of variable values. |
14 |
|
|
* |
15 |
|
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* 11/16/88 Added VARDEF structure for hard linking. |
16 |
greg |
1.2 |
* |
17 |
|
|
* 5/31/90 Added conditional compile (REDEFW) for redefinition warning. |
18 |
greg |
1.8 |
* |
19 |
greg |
1.10 |
* 4/23/91 Added ':' assignment for constant expressions |
20 |
greg |
1.13 |
* |
21 |
|
|
* 8/7/91 Added optional context path to append to variable names |
22 |
greg |
2.12 |
* |
23 |
|
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* 5/17/2001 Fixed clock counter wrapping behavior |
24 |
|
|
* |
25 |
|
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* 2/19/03 Eliminated conditional compiles in favor of esupport extern. |
26 |
|
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*/ |
27 |
|
|
|
28 |
greg |
2.13 |
#include "copyright.h" |
29 |
greg |
1.1 |
|
30 |
|
|
#include <stdio.h> |
31 |
greg |
2.12 |
#include <string.h> |
32 |
greg |
1.1 |
#include <ctype.h> |
33 |
|
|
|
34 |
schorsch |
2.18 |
#include "rterror.h" |
35 |
greg |
1.1 |
#include "calcomp.h" |
36 |
|
|
|
37 |
greg |
2.4 |
#ifndef NHASH |
38 |
|
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#define NHASH 521 /* hash size (a prime!) */ |
39 |
greg |
1.1 |
#endif |
40 |
|
|
|
41 |
greg |
2.5 |
#define hash(s) (shash(s)%NHASH) |
42 |
|
|
|
43 |
greg |
2.4 |
#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
44 |
greg |
1.1 |
|
45 |
schorsch |
2.18 |
static double dvalue(char *name, EPNODE *d); |
46 |
greg |
1.1 |
|
47 |
greg |
2.12 |
#define MAXCLOCK (1L<<31) /* clock wrap value */ |
48 |
greg |
1.1 |
|
49 |
greg |
2.8 |
unsigned long eclock = 0; /* value storage timer */ |
50 |
greg |
1.1 |
|
51 |
greg |
2.11 |
#define MAXCNTX 1023 /* maximum context length */ |
52 |
greg |
1.13 |
|
53 |
greg |
2.11 |
static char context[MAXCNTX+1]; /* current context path */ |
54 |
|
|
|
55 |
greg |
1.1 |
static VARDEF *hashtbl[NHASH]; /* definition list */ |
56 |
|
|
static int htndx; /* index for */ |
57 |
|
|
static VARDEF *htpos; /* ...dfirst() and */ |
58 |
|
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static EPNODE *ochpos; /* ...dnext */ |
59 |
|
|
static EPNODE *outchan; |
60 |
|
|
|
61 |
greg |
2.10 |
EPNODE *curfunc = NULL; |
62 |
greg |
2.4 |
#define dname(ep) ((ep)->v.kid->type == SYM ? \ |
63 |
greg |
1.1 |
(ep)->v.kid->v.name : \ |
64 |
|
|
(ep)->v.kid->v.kid->v.name) |
65 |
|
|
|
66 |
|
|
|
67 |
greg |
2.12 |
void |
68 |
schorsch |
2.16 |
fcompile( /* get definitions from a file */ |
69 |
|
|
char *fname |
70 |
|
|
) |
71 |
greg |
1.1 |
{ |
72 |
|
|
FILE *fp; |
73 |
|
|
|
74 |
|
|
if (fname == NULL) |
75 |
|
|
fp = stdin; |
76 |
|
|
else if ((fp = fopen(fname, "r")) == NULL) { |
77 |
|
|
eputs(fname); |
78 |
|
|
eputs(": cannot open\n"); |
79 |
|
|
quit(1); |
80 |
|
|
} |
81 |
greg |
1.4 |
initfile(fp, fname, 0); |
82 |
greg |
1.1 |
while (nextc != EOF) |
83 |
greg |
1.13 |
getstatement(); |
84 |
greg |
1.1 |
if (fname != NULL) |
85 |
|
|
fclose(fp); |
86 |
|
|
} |
87 |
|
|
|
88 |
|
|
|
89 |
greg |
2.12 |
void |
90 |
schorsch |
2.16 |
scompile( /* get definitions from a string */ |
91 |
|
|
char *str, |
92 |
|
|
char *fn, |
93 |
|
|
int ln |
94 |
|
|
) |
95 |
greg |
1.1 |
{ |
96 |
greg |
1.4 |
initstr(str, fn, ln); |
97 |
greg |
1.1 |
while (nextc != EOF) |
98 |
greg |
1.13 |
getstatement(); |
99 |
greg |
1.1 |
} |
100 |
|
|
|
101 |
|
|
|
102 |
|
|
double |
103 |
schorsch |
2.16 |
varvalue( /* return a variable's value */ |
104 |
|
|
char *vname |
105 |
|
|
) |
106 |
greg |
1.1 |
{ |
107 |
|
|
return(dvalue(vname, dlookup(vname))); |
108 |
|
|
} |
109 |
|
|
|
110 |
|
|
|
111 |
|
|
double |
112 |
schorsch |
2.16 |
evariable( /* evaluate a variable */ |
113 |
|
|
EPNODE *ep |
114 |
|
|
) |
115 |
greg |
1.1 |
{ |
116 |
|
|
register VARDEF *dp = ep->v.ln; |
117 |
|
|
|
118 |
|
|
return(dvalue(dp->name, dp->def)); |
119 |
|
|
} |
120 |
|
|
|
121 |
|
|
|
122 |
greg |
2.12 |
void |
123 |
schorsch |
2.16 |
varset( /* set a variable's value */ |
124 |
|
|
char *vname, |
125 |
|
|
int assign, |
126 |
|
|
double val |
127 |
|
|
) |
128 |
greg |
1.1 |
{ |
129 |
greg |
1.13 |
char *qname; |
130 |
greg |
1.1 |
register EPNODE *ep1, *ep2; |
131 |
greg |
1.13 |
/* get qualified name */ |
132 |
|
|
qname = qualname(vname, 0); |
133 |
greg |
1.1 |
/* check for quick set */ |
134 |
greg |
1.13 |
if ((ep1 = dlookup(qname)) != NULL && ep1->v.kid->type == SYM) { |
135 |
greg |
1.1 |
ep2 = ep1->v.kid->sibling; |
136 |
|
|
if (ep2->type == NUM) { |
137 |
|
|
ep2->v.num = val; |
138 |
greg |
1.8 |
ep1->type = assign; |
139 |
greg |
1.1 |
return; |
140 |
|
|
} |
141 |
|
|
} |
142 |
|
|
/* hand build definition */ |
143 |
|
|
ep1 = newnode(); |
144 |
greg |
1.8 |
ep1->type = assign; |
145 |
greg |
1.1 |
ep2 = newnode(); |
146 |
|
|
ep2->type = SYM; |
147 |
|
|
ep2->v.name = savestr(vname); |
148 |
|
|
addekid(ep1, ep2); |
149 |
|
|
ep2 = newnode(); |
150 |
|
|
ep2->type = NUM; |
151 |
|
|
ep2->v.num = val; |
152 |
|
|
addekid(ep1, ep2); |
153 |
greg |
1.13 |
dremove(qname); |
154 |
|
|
dpush(qname, ep1); |
155 |
greg |
1.1 |
} |
156 |
|
|
|
157 |
|
|
|
158 |
greg |
2.12 |
void |
159 |
schorsch |
2.16 |
dclear( /* delete variable definitions of name */ |
160 |
|
|
char *name |
161 |
|
|
) |
162 |
greg |
1.1 |
{ |
163 |
|
|
register EPNODE *ep; |
164 |
|
|
|
165 |
greg |
1.8 |
while ((ep = dpop(name)) != NULL) { |
166 |
|
|
if (ep->type == ':') { |
167 |
greg |
1.13 |
dpush(name, ep); /* don't clear constants */ |
168 |
greg |
1.8 |
return; |
169 |
|
|
} |
170 |
|
|
epfree(ep); |
171 |
|
|
} |
172 |
|
|
} |
173 |
|
|
|
174 |
|
|
|
175 |
greg |
2.12 |
void |
176 |
schorsch |
2.16 |
dremove( /* delete all definitions of name */ |
177 |
|
|
char *name |
178 |
|
|
) |
179 |
greg |
1.8 |
{ |
180 |
|
|
register EPNODE *ep; |
181 |
|
|
|
182 |
greg |
1.1 |
while ((ep = dpop(name)) != NULL) |
183 |
|
|
epfree(ep); |
184 |
|
|
} |
185 |
|
|
|
186 |
|
|
|
187 |
greg |
2.12 |
int |
188 |
schorsch |
2.16 |
vardefined( /* return non-zero if variable defined */ |
189 |
|
|
char *name |
190 |
|
|
) |
191 |
greg |
1.1 |
{ |
192 |
|
|
register EPNODE *dp; |
193 |
|
|
|
194 |
|
|
return((dp = dlookup(name)) != NULL && dp->v.kid->type == SYM); |
195 |
|
|
} |
196 |
|
|
|
197 |
|
|
|
198 |
greg |
1.13 |
char * |
199 |
schorsch |
2.16 |
setcontext( /* set a new context path */ |
200 |
|
|
register char *ctx |
201 |
|
|
) |
202 |
greg |
1.13 |
{ |
203 |
|
|
register char *cpp; |
204 |
|
|
|
205 |
|
|
if (ctx == NULL) |
206 |
|
|
return(context); /* just asking */ |
207 |
greg |
2.6 |
while (*ctx == CNTXMARK) |
208 |
|
|
ctx++; /* skip past marks */ |
209 |
greg |
1.13 |
if (!*ctx) { |
210 |
greg |
2.6 |
context[0] = '\0'; /* empty means clear context */ |
211 |
greg |
1.13 |
return(context); |
212 |
|
|
} |
213 |
greg |
2.6 |
cpp = context; /* start context with mark */ |
214 |
|
|
*cpp++ = CNTXMARK; |
215 |
|
|
do { /* carefully copy new context */ |
216 |
greg |
2.11 |
if (cpp >= context+MAXCNTX) |
217 |
greg |
1.18 |
break; /* just copy what we can */ |
218 |
greg |
1.13 |
if (isid(*ctx)) |
219 |
|
|
*cpp++ = *ctx++; |
220 |
|
|
else { |
221 |
|
|
*cpp++ = '_'; ctx++; |
222 |
|
|
} |
223 |
|
|
} while (*ctx); |
224 |
greg |
2.6 |
while (cpp[-1] == CNTXMARK) /* cannot end in context mark */ |
225 |
|
|
cpp--; |
226 |
greg |
1.13 |
*cpp = '\0'; |
227 |
greg |
2.6 |
return(context); |
228 |
|
|
} |
229 |
|
|
|
230 |
|
|
|
231 |
|
|
char * |
232 |
schorsch |
2.16 |
pushcontext( /* push on another context */ |
233 |
|
|
char *ctx |
234 |
|
|
) |
235 |
greg |
2.6 |
{ |
236 |
greg |
2.11 |
char oldcontext[MAXCNTX+1]; |
237 |
greg |
2.6 |
register int n; |
238 |
|
|
|
239 |
|
|
strcpy(oldcontext, context); /* save old context */ |
240 |
|
|
setcontext(ctx); /* set new context */ |
241 |
|
|
n = strlen(context); /* tack on old */ |
242 |
greg |
2.11 |
if (n+strlen(oldcontext) > MAXCNTX) { |
243 |
|
|
strncpy(context+n, oldcontext, MAXCNTX-n); |
244 |
|
|
context[MAXCNTX] = '\0'; |
245 |
greg |
2.6 |
} else |
246 |
|
|
strcpy(context+n, oldcontext); |
247 |
|
|
return(context); |
248 |
|
|
} |
249 |
|
|
|
250 |
|
|
|
251 |
|
|
char * |
252 |
schorsch |
2.16 |
popcontext(void) /* pop off top context */ |
253 |
greg |
2.6 |
{ |
254 |
|
|
register char *cp1, *cp2; |
255 |
|
|
|
256 |
|
|
if (!context[0]) /* nothing left to pop */ |
257 |
|
|
return(context); |
258 |
|
|
cp2 = context; /* find mark */ |
259 |
|
|
while (*++cp2 && *cp2 != CNTXMARK) |
260 |
|
|
; |
261 |
|
|
cp1 = context; /* copy tail to front */ |
262 |
|
|
while (*cp1++ = *cp2++) |
263 |
|
|
; |
264 |
greg |
1.13 |
return(context); |
265 |
|
|
} |
266 |
|
|
|
267 |
|
|
|
268 |
|
|
char * |
269 |
schorsch |
2.16 |
qualname( /* get qualified name */ |
270 |
|
|
register char *nam, |
271 |
|
|
int lvl |
272 |
|
|
) |
273 |
greg |
1.13 |
{ |
274 |
schorsch |
2.17 |
static char nambuf[RMAXWORD+1]; |
275 |
greg |
1.17 |
register char *cp = nambuf, *cpp; |
276 |
|
|
/* check for explicit local */ |
277 |
greg |
1.15 |
if (*nam == CNTXMARK) |
278 |
greg |
1.17 |
if (lvl > 0) /* only action is to refuse search */ |
279 |
|
|
return(NULL); |
280 |
|
|
else |
281 |
|
|
nam++; |
282 |
|
|
else if (nam == nambuf) /* check for repeat call */ |
283 |
|
|
return(lvl > 0 ? NULL : nam); |
284 |
greg |
1.13 |
/* copy name to static buffer */ |
285 |
|
|
while (*nam) { |
286 |
schorsch |
2.17 |
if (cp >= nambuf+RMAXWORD) |
287 |
greg |
1.13 |
goto toolong; |
288 |
greg |
1.17 |
*cp++ = *nam++; |
289 |
greg |
1.13 |
} |
290 |
greg |
1.17 |
/* check for explicit global */ |
291 |
|
|
if (cp > nambuf && cp[-1] == CNTXMARK) { |
292 |
greg |
1.13 |
if (lvl > 0) |
293 |
greg |
1.17 |
return(NULL); |
294 |
|
|
*--cp = '\0'; |
295 |
|
|
return(nambuf); /* already qualified */ |
296 |
|
|
} |
297 |
|
|
cpp = context; /* else skip the requested levels */ |
298 |
|
|
while (lvl-- > 0) { |
299 |
|
|
if (!*cpp) |
300 |
|
|
return(NULL); /* return NULL if past global level */ |
301 |
|
|
while (*++cpp && *cpp != CNTXMARK) |
302 |
|
|
; |
303 |
|
|
} |
304 |
greg |
1.13 |
while (*cpp) { /* copy context to static buffer */ |
305 |
schorsch |
2.17 |
if (cp >= nambuf+RMAXWORD) |
306 |
greg |
1.13 |
goto toolong; |
307 |
|
|
*cp++ = *cpp++; |
308 |
|
|
} |
309 |
greg |
1.18 |
toolong: |
310 |
greg |
1.13 |
*cp = '\0'; |
311 |
|
|
return(nambuf); /* return qualified name */ |
312 |
|
|
} |
313 |
|
|
|
314 |
|
|
|
315 |
greg |
2.12 |
int |
316 |
schorsch |
2.16 |
incontext( /* is qualified name in current context? */ |
317 |
|
|
register char *qn |
318 |
|
|
) |
319 |
greg |
1.14 |
{ |
320 |
greg |
2.9 |
if (!context[0]) /* global context accepts all */ |
321 |
|
|
return(1); |
322 |
greg |
1.14 |
while (*qn && *qn != CNTXMARK) /* find context mark */ |
323 |
greg |
1.19 |
qn++; |
324 |
greg |
1.14 |
return(!strcmp(qn, context)); |
325 |
|
|
} |
326 |
|
|
|
327 |
|
|
|
328 |
greg |
2.12 |
void |
329 |
schorsch |
2.16 |
chanout( /* set output channels */ |
330 |
|
|
void (*cs)(int n, double v) |
331 |
|
|
) |
332 |
greg |
1.1 |
{ |
333 |
|
|
register EPNODE *ep; |
334 |
|
|
|
335 |
|
|
for (ep = outchan; ep != NULL; ep = ep->sibling) |
336 |
greg |
1.6 |
(*cs)(ep->v.kid->v.chan, evalue(ep->v.kid->sibling)); |
337 |
greg |
1.1 |
|
338 |
|
|
} |
339 |
|
|
|
340 |
|
|
|
341 |
greg |
2.12 |
void |
342 |
schorsch |
2.16 |
dcleanup( /* clear definitions (0->vars,1->output,2->consts) */ |
343 |
|
|
int lvl |
344 |
|
|
) |
345 |
greg |
1.1 |
{ |
346 |
|
|
register int i; |
347 |
|
|
register VARDEF *vp; |
348 |
|
|
register EPNODE *ep; |
349 |
greg |
1.14 |
/* if context is global, clear all */ |
350 |
greg |
1.1 |
for (i = 0; i < NHASH; i++) |
351 |
|
|
for (vp = hashtbl[i]; vp != NULL; vp = vp->next) |
352 |
greg |
2.9 |
if (incontext(vp->name)) |
353 |
greg |
1.14 |
if (lvl >= 2) |
354 |
|
|
dremove(vp->name); |
355 |
|
|
else |
356 |
|
|
dclear(vp->name); |
357 |
greg |
1.12 |
if (lvl >= 1) { |
358 |
greg |
1.9 |
for (ep = outchan; ep != NULL; ep = ep->sibling) |
359 |
|
|
epfree(ep); |
360 |
|
|
outchan = NULL; |
361 |
|
|
} |
362 |
greg |
1.1 |
} |
363 |
|
|
|
364 |
|
|
|
365 |
|
|
EPNODE * |
366 |
schorsch |
2.16 |
dlookup( /* look up a definition */ |
367 |
|
|
char *name |
368 |
|
|
) |
369 |
greg |
1.1 |
{ |
370 |
|
|
register VARDEF *vp; |
371 |
|
|
|
372 |
|
|
if ((vp = varlookup(name)) == NULL) |
373 |
greg |
2.4 |
return(NULL); |
374 |
greg |
1.1 |
return(vp->def); |
375 |
|
|
} |
376 |
|
|
|
377 |
|
|
|
378 |
|
|
VARDEF * |
379 |
schorsch |
2.16 |
varlookup( /* look up a variable */ |
380 |
|
|
char *name |
381 |
|
|
) |
382 |
greg |
1.1 |
{ |
383 |
greg |
2.4 |
int lvl = 0; |
384 |
greg |
1.13 |
register char *qname; |
385 |
greg |
1.1 |
register VARDEF *vp; |
386 |
greg |
2.4 |
/* find most qualified match */ |
387 |
greg |
1.13 |
while ((qname = qualname(name, lvl++)) != NULL) |
388 |
|
|
for (vp = hashtbl[hash(qname)]; vp != NULL; vp = vp->next) |
389 |
|
|
if (!strcmp(vp->name, qname)) |
390 |
|
|
return(vp); |
391 |
greg |
1.1 |
return(NULL); |
392 |
|
|
} |
393 |
|
|
|
394 |
|
|
|
395 |
|
|
VARDEF * |
396 |
schorsch |
2.16 |
varinsert( /* get a link to a variable */ |
397 |
|
|
char *name |
398 |
|
|
) |
399 |
greg |
1.1 |
{ |
400 |
|
|
register VARDEF *vp; |
401 |
greg |
2.4 |
int hv; |
402 |
greg |
1.1 |
|
403 |
greg |
1.13 |
if ((vp = varlookup(name)) != NULL) { |
404 |
|
|
vp->nlinks++; |
405 |
|
|
return(vp); |
406 |
|
|
} |
407 |
greg |
2.3 |
vp = (VARDEF *)emalloc(sizeof(VARDEF)); |
408 |
|
|
vp->lib = liblookup(name); |
409 |
|
|
if (vp->lib == NULL) /* if name not in library */ |
410 |
greg |
1.16 |
name = qualname(name, 0); /* use fully qualified version */ |
411 |
greg |
1.1 |
hv = hash(name); |
412 |
|
|
vp->name = savestr(name); |
413 |
|
|
vp->nlinks = 1; |
414 |
|
|
vp->def = NULL; |
415 |
|
|
vp->next = hashtbl[hv]; |
416 |
|
|
hashtbl[hv] = vp; |
417 |
|
|
return(vp); |
418 |
|
|
} |
419 |
greg |
2.2 |
|
420 |
|
|
|
421 |
greg |
2.12 |
void |
422 |
schorsch |
2.16 |
libupdate( /* update library links */ |
423 |
|
|
char *fn |
424 |
|
|
) |
425 |
greg |
2.2 |
{ |
426 |
|
|
register int i; |
427 |
|
|
register VARDEF *vp; |
428 |
|
|
/* if fn is NULL then relink all */ |
429 |
|
|
for (i = 0; i < NHASH; i++) |
430 |
|
|
for (vp = hashtbl[i]; vp != NULL; vp = vp->next) |
431 |
|
|
if (vp->lib != NULL || fn == NULL || !strcmp(fn, vp->name)) |
432 |
|
|
vp->lib = liblookup(vp->name); |
433 |
|
|
} |
434 |
greg |
1.1 |
|
435 |
|
|
|
436 |
greg |
2.12 |
void |
437 |
schorsch |
2.16 |
varfree( /* release link to variable */ |
438 |
|
|
register VARDEF *ln |
439 |
|
|
) |
440 |
greg |
1.1 |
{ |
441 |
|
|
register VARDEF *vp; |
442 |
greg |
2.4 |
int hv; |
443 |
greg |
1.1 |
|
444 |
|
|
if (--ln->nlinks > 0) |
445 |
greg |
2.4 |
return; /* still active */ |
446 |
greg |
1.1 |
|
447 |
|
|
hv = hash(ln->name); |
448 |
|
|
vp = hashtbl[hv]; |
449 |
|
|
if (vp == ln) |
450 |
greg |
2.4 |
hashtbl[hv] = vp->next; |
451 |
greg |
1.1 |
else { |
452 |
greg |
2.4 |
while (vp->next != ln) /* must be in list */ |
453 |
|
|
vp = vp->next; |
454 |
|
|
vp->next = ln->next; |
455 |
greg |
1.1 |
} |
456 |
|
|
freestr(ln->name); |
457 |
|
|
efree((char *)ln); |
458 |
|
|
} |
459 |
|
|
|
460 |
|
|
|
461 |
|
|
EPNODE * |
462 |
schorsch |
2.16 |
dfirst(void) /* return pointer to first definition */ |
463 |
greg |
1.1 |
{ |
464 |
|
|
htndx = 0; |
465 |
|
|
htpos = NULL; |
466 |
|
|
ochpos = outchan; |
467 |
|
|
return(dnext()); |
468 |
|
|
} |
469 |
|
|
|
470 |
|
|
|
471 |
|
|
EPNODE * |
472 |
schorsch |
2.16 |
dnext(void) /* return pointer to next definition */ |
473 |
greg |
1.1 |
{ |
474 |
|
|
register EPNODE *ep; |
475 |
greg |
1.19 |
register char *nm; |
476 |
greg |
1.1 |
|
477 |
|
|
while (htndx < NHASH) { |
478 |
greg |
2.4 |
if (htpos == NULL) |
479 |
|
|
htpos = hashtbl[htndx++]; |
480 |
|
|
while (htpos != NULL) { |
481 |
|
|
ep = htpos->def; |
482 |
greg |
1.19 |
nm = htpos->name; |
483 |
greg |
2.4 |
htpos = htpos->next; |
484 |
|
|
if (ep != NULL && incontext(nm)) |
485 |
|
|
return(ep); |
486 |
|
|
} |
487 |
greg |
1.1 |
} |
488 |
|
|
if ((ep = ochpos) != NULL) |
489 |
greg |
2.4 |
ochpos = ep->sibling; |
490 |
greg |
1.1 |
return(ep); |
491 |
|
|
} |
492 |
|
|
|
493 |
|
|
|
494 |
|
|
EPNODE * |
495 |
schorsch |
2.16 |
dpop( /* pop a definition */ |
496 |
|
|
char *name |
497 |
|
|
) |
498 |
greg |
1.1 |
{ |
499 |
|
|
register VARDEF *vp; |
500 |
|
|
register EPNODE *dp; |
501 |
|
|
|
502 |
|
|
if ((vp = varlookup(name)) == NULL || vp->def == NULL) |
503 |
greg |
2.4 |
return(NULL); |
504 |
greg |
1.1 |
dp = vp->def; |
505 |
|
|
vp->def = dp->sibling; |
506 |
|
|
varfree(vp); |
507 |
|
|
return(dp); |
508 |
|
|
} |
509 |
|
|
|
510 |
|
|
|
511 |
greg |
2.12 |
void |
512 |
schorsch |
2.16 |
dpush( /* push on a definition */ |
513 |
|
|
char *nm, |
514 |
|
|
register EPNODE *ep |
515 |
|
|
) |
516 |
greg |
1.1 |
{ |
517 |
|
|
register VARDEF *vp; |
518 |
|
|
|
519 |
greg |
1.13 |
vp = varinsert(nm); |
520 |
greg |
1.1 |
ep->sibling = vp->def; |
521 |
|
|
vp->def = ep; |
522 |
|
|
} |
523 |
|
|
|
524 |
|
|
|
525 |
greg |
2.12 |
void |
526 |
schorsch |
2.16 |
addchan( /* add an output channel assignment */ |
527 |
|
|
EPNODE *sp |
528 |
|
|
) |
529 |
greg |
1.1 |
{ |
530 |
greg |
2.4 |
int ch = sp->v.kid->v.chan; |
531 |
greg |
1.1 |
register EPNODE *ep, *epl; |
532 |
|
|
|
533 |
|
|
for (epl = NULL, ep = outchan; ep != NULL; epl = ep, ep = ep->sibling) |
534 |
|
|
if (ep->v.kid->v.chan >= ch) { |
535 |
|
|
if (epl != NULL) |
536 |
|
|
epl->sibling = sp; |
537 |
|
|
else |
538 |
|
|
outchan = sp; |
539 |
|
|
if (ep->v.kid->v.chan > ch) |
540 |
|
|
sp->sibling = ep; |
541 |
|
|
else { |
542 |
|
|
sp->sibling = ep->sibling; |
543 |
|
|
epfree(ep); |
544 |
|
|
} |
545 |
|
|
return; |
546 |
|
|
} |
547 |
|
|
if (epl != NULL) |
548 |
|
|
epl->sibling = sp; |
549 |
|
|
else |
550 |
|
|
outchan = sp; |
551 |
|
|
sp->sibling = NULL; |
552 |
|
|
|
553 |
|
|
} |
554 |
|
|
|
555 |
|
|
|
556 |
greg |
2.12 |
void |
557 |
schorsch |
2.16 |
getstatement(void) /* get next statement */ |
558 |
greg |
1.1 |
{ |
559 |
|
|
register EPNODE *ep; |
560 |
greg |
1.13 |
char *qname; |
561 |
greg |
1.16 |
register VARDEF *vdef; |
562 |
greg |
1.1 |
|
563 |
|
|
if (nextc == ';') { /* empty statement */ |
564 |
|
|
scan(); |
565 |
|
|
return; |
566 |
|
|
} |
567 |
greg |
2.12 |
if (esupport&E_OUTCHAN && |
568 |
|
|
nextc == '$') { /* channel assignment */ |
569 |
greg |
1.1 |
ep = getchan(); |
570 |
|
|
addchan(ep); |
571 |
greg |
2.12 |
} else { /* ordinary definition */ |
572 |
greg |
1.1 |
ep = getdefn(); |
573 |
greg |
1.13 |
qname = qualname(dname(ep), 0); |
574 |
greg |
2.12 |
if (esupport&E_REDEFW && (vdef = varlookup(qname)) != NULL) |
575 |
greg |
2.7 |
if (vdef->def != NULL && epcmp(ep, vdef->def)) { |
576 |
greg |
1.16 |
wputs(qname); |
577 |
|
|
if (vdef->def->type == ':') |
578 |
|
|
wputs(": redefined constant expression\n"); |
579 |
|
|
else |
580 |
|
|
wputs(": redefined\n"); |
581 |
greg |
2.12 |
} else if (ep->v.kid->type == FUNC && vdef->lib != NULL) { |
582 |
greg |
1.16 |
wputs(qname); |
583 |
|
|
wputs(": definition hides library function\n"); |
584 |
|
|
} |
585 |
greg |
1.10 |
if (ep->type == ':') |
586 |
greg |
1.13 |
dremove(qname); |
587 |
greg |
1.10 |
else |
588 |
greg |
1.13 |
dclear(qname); |
589 |
|
|
dpush(qname, ep); |
590 |
greg |
1.1 |
} |
591 |
|
|
if (nextc != EOF) { |
592 |
|
|
if (nextc != ';') |
593 |
|
|
syntax("';' expected"); |
594 |
|
|
scan(); |
595 |
|
|
} |
596 |
|
|
} |
597 |
|
|
|
598 |
|
|
|
599 |
|
|
EPNODE * |
600 |
schorsch |
2.16 |
getdefn(void) |
601 |
|
|
/* A -> SYM = E1 */ |
602 |
|
|
/* SYM : E1 */ |
603 |
|
|
/* FUNC(SYM,..) = E1 */ |
604 |
|
|
/* FUNC(SYM,..) : E1 */ |
605 |
greg |
1.1 |
{ |
606 |
|
|
register EPNODE *ep1, *ep2; |
607 |
|
|
|
608 |
greg |
1.18 |
if (!isalpha(nextc) && nextc != CNTXMARK) |
609 |
greg |
1.1 |
syntax("illegal variable name"); |
610 |
|
|
|
611 |
|
|
ep1 = newnode(); |
612 |
|
|
ep1->type = SYM; |
613 |
|
|
ep1->v.name = savestr(getname()); |
614 |
|
|
|
615 |
greg |
2.12 |
if (esupport&E_FUNCTION && nextc == '(') { |
616 |
greg |
1.1 |
ep2 = newnode(); |
617 |
|
|
ep2->type = FUNC; |
618 |
|
|
addekid(ep2, ep1); |
619 |
|
|
ep1 = ep2; |
620 |
|
|
do { |
621 |
|
|
scan(); |
622 |
|
|
if (!isalpha(nextc)) |
623 |
|
|
syntax("illegal variable name"); |
624 |
|
|
ep2 = newnode(); |
625 |
|
|
ep2->type = SYM; |
626 |
|
|
ep2->v.name = savestr(getname()); |
627 |
|
|
addekid(ep1, ep2); |
628 |
|
|
} while (nextc == ','); |
629 |
|
|
if (nextc != ')') |
630 |
|
|
syntax("')' expected"); |
631 |
|
|
scan(); |
632 |
|
|
curfunc = ep1; |
633 |
greg |
2.10 |
} |
634 |
greg |
1.1 |
|
635 |
greg |
1.8 |
if (nextc != '=' && nextc != ':') |
636 |
|
|
syntax("'=' or ':' expected"); |
637 |
greg |
1.1 |
|
638 |
|
|
ep2 = newnode(); |
639 |
greg |
1.8 |
ep2->type = nextc; |
640 |
|
|
scan(); |
641 |
greg |
1.1 |
addekid(ep2, ep1); |
642 |
|
|
addekid(ep2, getE1()); |
643 |
|
|
|
644 |
greg |
2.12 |
if (ep1->type == SYM && ep1->sibling->type != NUM) { |
645 |
greg |
1.1 |
ep1 = newnode(); |
646 |
|
|
ep1->type = TICK; |
647 |
greg |
2.8 |
ep1->v.tick = 0; |
648 |
greg |
1.1 |
addekid(ep2, ep1); |
649 |
|
|
ep1 = newnode(); |
650 |
|
|
ep1->type = NUM; |
651 |
|
|
addekid(ep2, ep1); |
652 |
|
|
} |
653 |
greg |
2.10 |
curfunc = NULL; |
654 |
greg |
1.1 |
|
655 |
|
|
return(ep2); |
656 |
|
|
} |
657 |
|
|
|
658 |
|
|
|
659 |
|
|
EPNODE * |
660 |
schorsch |
2.16 |
getchan(void) /* A -> $N = E1 */ |
661 |
greg |
1.1 |
{ |
662 |
|
|
register EPNODE *ep1, *ep2; |
663 |
|
|
|
664 |
|
|
if (nextc != '$') |
665 |
|
|
syntax("missing '$'"); |
666 |
|
|
scan(); |
667 |
|
|
|
668 |
|
|
ep1 = newnode(); |
669 |
|
|
ep1->type = CHAN; |
670 |
|
|
ep1->v.chan = getinum(); |
671 |
|
|
|
672 |
|
|
if (nextc != '=') |
673 |
|
|
syntax("'=' expected"); |
674 |
|
|
scan(); |
675 |
|
|
|
676 |
|
|
ep2 = newnode(); |
677 |
|
|
ep2->type = '='; |
678 |
|
|
addekid(ep2, ep1); |
679 |
|
|
addekid(ep2, getE1()); |
680 |
|
|
|
681 |
|
|
return(ep2); |
682 |
|
|
} |
683 |
|
|
|
684 |
|
|
|
685 |
|
|
|
686 |
|
|
/* |
687 |
|
|
* The following routines are for internal use only: |
688 |
|
|
*/ |
689 |
|
|
|
690 |
|
|
|
691 |
schorsch |
2.18 |
static double /* evaluate a variable */ |
692 |
|
|
dvalue(char *name, EPNODE *d) |
693 |
greg |
1.1 |
{ |
694 |
|
|
register EPNODE *ep1, *ep2; |
695 |
|
|
|
696 |
|
|
if (d == NULL || d->v.kid->type != SYM) { |
697 |
|
|
eputs(name); |
698 |
|
|
eputs(": undefined variable\n"); |
699 |
|
|
quit(1); |
700 |
|
|
} |
701 |
|
|
ep1 = d->v.kid->sibling; /* get expression */ |
702 |
greg |
1.5 |
if (ep1->type == NUM) |
703 |
|
|
return(ep1->v.num); /* return if number */ |
704 |
greg |
1.1 |
ep2 = ep1->sibling; /* check time */ |
705 |
greg |
2.12 |
if (eclock >= MAXCLOCK) |
706 |
|
|
eclock = 1; /* wrap clock counter */ |
707 |
|
|
if (ep2->v.tick < MAXCLOCK && |
708 |
|
|
ep2->v.tick == 0 | ep2->v.tick != eclock) { |
709 |
|
|
ep2->v.tick = d->type == ':' ? MAXCLOCK : eclock; |
710 |
greg |
1.1 |
ep2 = ep2->sibling; |
711 |
greg |
1.5 |
ep2->v.num = evalue(ep1); /* needs new value */ |
712 |
greg |
1.1 |
} else |
713 |
greg |
1.5 |
ep2 = ep2->sibling; /* else reuse old value */ |
714 |
greg |
1.1 |
|
715 |
|
|
return(ep2->v.num); |
716 |
|
|
} |