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/* Copyright (c) 1991 Regents of the University of California */ |
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|
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#ifndef lint |
2 |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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|
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/* |
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* Store variable definitions. |
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* |
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* 4/23/91 Added ':' assignment for constant expressions |
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* |
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* 8/7/91 Added optional context path to append to variable names |
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* |
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* 5/17/2001 Fixed clock counter wrapping behavior |
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* |
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* 2/19/03 Eliminated conditional compiles in favor of esupport extern. |
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*/ |
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#include "copyright.h" |
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|
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#include <stdio.h> |
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#include <string.h> |
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|
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#include <ctype.h> |
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#include "calcomp.h" |
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|
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#ifndef NHASH |
39 |
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#define NHASH 521 /* hash size (a prime!) */ |
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#ifndef NHASH |
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#define NHASH 521 /* hash size (a prime!) */ |
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#endif |
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42 |
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#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
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#define hash(s) (shash(s)%NHASH) |
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|
44 |
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extern char *ecalloc(), *savestr(), *strcpy(); |
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#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
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|
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static double dvalue(); |
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long eclock = -1; /* value storage timer */ |
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#define MAXCLOCK (1L<<31) /* clock wrap value */ |
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|
50 |
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static char context[MAXWORD]; /* current context path */ |
50 |
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unsigned long eclock = 0; /* value storage timer */ |
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|
52 |
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#define MAXCNTX 1023 /* maximum context length */ |
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|
54 |
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static char context[MAXCNTX+1]; /* current context path */ |
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|
56 |
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static VARDEF *hashtbl[NHASH]; /* definition list */ |
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static int htndx; /* index for */ |
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static VARDEF *htpos; /* ...dfirst() and */ |
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#ifdef OUTCHAN |
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static EPNODE *ochpos; /* ...dnext */ |
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static EPNODE *outchan; |
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#endif |
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|
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#ifdef FUNCTION |
63 |
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EPNODE *curfunc; |
57 |
< |
#define dname(ep) ((ep)->v.kid->type == SYM ? \ |
62 |
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EPNODE *curfunc = NULL; |
63 |
> |
#define dname(ep) ((ep)->v.kid->type == SYM ? \ |
64 |
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(ep)->v.kid->v.name : \ |
65 |
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(ep)->v.kid->v.kid->v.name) |
60 |
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#else |
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#define dname(ep) ((ep)->v.kid->v.name) |
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#endif |
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|
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|
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void |
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fcompile(fname) /* get definitions from a file */ |
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char *fname; |
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{ |
86 |
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} |
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|
88 |
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|
89 |
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void |
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scompile(str, fn, ln) /* get definitions from a string */ |
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char *str; |
92 |
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char *fn; |
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|
109 |
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double |
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evariable(ep) /* evaluate a variable */ |
111 |
< |
EPNODE *ep; |
111 |
> |
EPNODE *ep; |
112 |
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{ |
113 |
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register VARDEF *dp = ep->v.ln; |
114 |
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|
116 |
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} |
117 |
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|
118 |
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|
119 |
+ |
void |
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varset(vname, assign, val) /* set a variable's value */ |
121 |
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char *vname; |
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int assign; |
123 |
< |
double val; |
123 |
> |
double val; |
124 |
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{ |
125 |
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char *qname; |
126 |
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register EPNODE *ep1, *ep2; |
151 |
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} |
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|
153 |
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|
154 |
+ |
void |
155 |
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dclear(name) /* delete variable definitions of name */ |
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char *name; |
157 |
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{ |
167 |
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} |
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|
169 |
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|
170 |
+ |
void |
171 |
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dremove(name) /* delete all definitions of name */ |
172 |
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char *name; |
173 |
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{ |
178 |
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} |
179 |
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|
180 |
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|
181 |
+ |
int |
182 |
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vardefined(name) /* return non-zero if variable defined */ |
183 |
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char *name; |
184 |
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{ |
196 |
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|
197 |
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if (ctx == NULL) |
198 |
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return(context); /* just asking */ |
199 |
+ |
while (*ctx == CNTXMARK) |
200 |
+ |
ctx++; /* skip past marks */ |
201 |
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if (!*ctx) { |
202 |
< |
context[0] = '\0'; /* clear context */ |
202 |
> |
context[0] = '\0'; /* empty means clear context */ |
203 |
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return(context); |
204 |
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} |
205 |
< |
cpp = context; /* else copy it (carefully!) */ |
206 |
< |
if (*ctx != CNTXMARK) |
207 |
< |
*cpp++ = CNTXMARK; /* make sure there's a mark */ |
208 |
< |
do { |
209 |
< |
if (cpp >= context+MAXWORD-1) { |
199 |
< |
*cpp = '\0'; |
200 |
< |
wputs(context); |
201 |
< |
wputs(": context path too long\n"); |
202 |
< |
return(NULL); |
203 |
< |
} |
205 |
> |
cpp = context; /* start context with mark */ |
206 |
> |
*cpp++ = CNTXMARK; |
207 |
> |
do { /* carefully copy new context */ |
208 |
> |
if (cpp >= context+MAXCNTX) |
209 |
> |
break; /* just copy what we can */ |
210 |
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if (isid(*ctx)) |
211 |
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*cpp++ = *ctx++; |
212 |
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else { |
213 |
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*cpp++ = '_'; ctx++; |
214 |
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} |
215 |
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} while (*ctx); |
216 |
+ |
while (cpp[-1] == CNTXMARK) /* cannot end in context mark */ |
217 |
+ |
cpp--; |
218 |
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*cpp = '\0'; |
219 |
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return(context); |
220 |
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} |
221 |
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|
222 |
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|
223 |
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char * |
224 |
+ |
pushcontext(ctx) /* push on another context */ |
225 |
+ |
char *ctx; |
226 |
+ |
{ |
227 |
+ |
char oldcontext[MAXCNTX+1]; |
228 |
+ |
register int n; |
229 |
+ |
|
230 |
+ |
strcpy(oldcontext, context); /* save old context */ |
231 |
+ |
setcontext(ctx); /* set new context */ |
232 |
+ |
n = strlen(context); /* tack on old */ |
233 |
+ |
if (n+strlen(oldcontext) > MAXCNTX) { |
234 |
+ |
strncpy(context+n, oldcontext, MAXCNTX-n); |
235 |
+ |
context[MAXCNTX] = '\0'; |
236 |
+ |
} else |
237 |
+ |
strcpy(context+n, oldcontext); |
238 |
+ |
return(context); |
239 |
+ |
} |
240 |
+ |
|
241 |
+ |
|
242 |
+ |
char * |
243 |
+ |
popcontext() /* pop off top context */ |
244 |
+ |
{ |
245 |
+ |
register char *cp1, *cp2; |
246 |
+ |
|
247 |
+ |
if (!context[0]) /* nothing left to pop */ |
248 |
+ |
return(context); |
249 |
+ |
cp2 = context; /* find mark */ |
250 |
+ |
while (*++cp2 && *cp2 != CNTXMARK) |
251 |
+ |
; |
252 |
+ |
cp1 = context; /* copy tail to front */ |
253 |
+ |
while (*cp1++ = *cp2++) |
254 |
+ |
; |
255 |
+ |
return(context); |
256 |
+ |
} |
257 |
+ |
|
258 |
+ |
|
259 |
+ |
char * |
260 |
|
qualname(nam, lvl) /* get qualified name */ |
261 |
|
register char *nam; |
262 |
|
int lvl; |
263 |
|
{ |
264 |
< |
static char nambuf[MAXWORD]; |
265 |
< |
register char *cp = nambuf, *cpp = context; |
266 |
< |
/* check for repeat call */ |
267 |
< |
if (nam == nambuf) |
268 |
< |
return(lvl > 0 ? NULL : nambuf); |
264 |
> |
static char nambuf[MAXWORD+1]; |
265 |
> |
register char *cp = nambuf, *cpp; |
266 |
> |
/* check for explicit local */ |
267 |
> |
if (*nam == CNTXMARK) |
268 |
> |
if (lvl > 0) /* only action is to refuse search */ |
269 |
> |
return(NULL); |
270 |
> |
else |
271 |
> |
nam++; |
272 |
> |
else if (nam == nambuf) /* check for repeat call */ |
273 |
> |
return(lvl > 0 ? NULL : nam); |
274 |
|
/* copy name to static buffer */ |
275 |
|
while (*nam) { |
276 |
< |
if (cp >= nambuf+MAXWORD-1) |
276 |
> |
if (cp >= nambuf+MAXWORD) |
277 |
|
goto toolong; |
278 |
< |
if ((*cp++ = *nam++) == CNTXMARK) |
230 |
< |
cpp = NULL; /* flag a qualified name */ |
278 |
> |
*cp++ = *nam++; |
279 |
|
} |
280 |
< |
if (cpp == NULL) { |
280 |
> |
/* check for explicit global */ |
281 |
> |
if (cp > nambuf && cp[-1] == CNTXMARK) { |
282 |
|
if (lvl > 0) |
283 |
< |
return(NULL); /* no higher level */ |
284 |
< |
if (cp[-1] == CNTXMARK) { |
285 |
< |
cp--; cpp = context; /* current context explicitly */ |
286 |
< |
} else |
287 |
< |
cpp = ""; /* else fully qualified */ |
288 |
< |
} else /* else skip the requested levels */ |
289 |
< |
while (lvl-- > 0) { |
290 |
< |
if (!*cpp) |
291 |
< |
return(NULL); /* return NULL if past global level */ |
292 |
< |
while (*++cpp && *cpp != CNTXMARK) |
293 |
< |
; |
245 |
< |
} |
283 |
> |
return(NULL); |
284 |
> |
*--cp = '\0'; |
285 |
> |
return(nambuf); /* already qualified */ |
286 |
> |
} |
287 |
> |
cpp = context; /* else skip the requested levels */ |
288 |
> |
while (lvl-- > 0) { |
289 |
> |
if (!*cpp) |
290 |
> |
return(NULL); /* return NULL if past global level */ |
291 |
> |
while (*++cpp && *cpp != CNTXMARK) |
292 |
> |
; |
293 |
> |
} |
294 |
|
while (*cpp) { /* copy context to static buffer */ |
295 |
< |
if (cp >= nambuf+MAXWORD-1) |
295 |
> |
if (cp >= nambuf+MAXWORD) |
296 |
|
goto toolong; |
297 |
|
*cp++ = *cpp++; |
298 |
|
} |
251 |
– |
*cp = '\0'; |
252 |
– |
return(nambuf); /* return qualified name */ |
299 |
|
toolong: |
300 |
|
*cp = '\0'; |
301 |
< |
wputs(nambuf); |
256 |
< |
wputs(": name too long\n"); |
257 |
< |
return(NULL); |
301 |
> |
return(nambuf); /* return qualified name */ |
302 |
|
} |
303 |
|
|
304 |
|
|
305 |
< |
#ifdef OUTCHAN |
305 |
> |
int |
306 |
> |
incontext(qn) /* is qualified name in current context? */ |
307 |
> |
register char *qn; |
308 |
> |
{ |
309 |
> |
if (!context[0]) /* global context accepts all */ |
310 |
> |
return(1); |
311 |
> |
while (*qn && *qn != CNTXMARK) /* find context mark */ |
312 |
> |
qn++; |
313 |
> |
return(!strcmp(qn, context)); |
314 |
> |
} |
315 |
> |
|
316 |
> |
|
317 |
> |
void |
318 |
|
chanout(cs) /* set output channels */ |
319 |
|
int (*cs)(); |
320 |
|
{ |
324 |
|
(*cs)(ep->v.kid->v.chan, evalue(ep->v.kid->sibling)); |
325 |
|
|
326 |
|
} |
271 |
– |
#endif |
327 |
|
|
328 |
|
|
329 |
+ |
void |
330 |
|
dcleanup(lvl) /* clear definitions (0->vars,1->output,2->consts) */ |
331 |
|
int lvl; |
332 |
|
{ |
333 |
|
register int i; |
334 |
|
register VARDEF *vp; |
335 |
|
register EPNODE *ep; |
336 |
< |
|
336 |
> |
/* if context is global, clear all */ |
337 |
|
for (i = 0; i < NHASH; i++) |
338 |
|
for (vp = hashtbl[i]; vp != NULL; vp = vp->next) |
339 |
< |
if (lvl >= 2) |
340 |
< |
dremove(vp->name); |
341 |
< |
else |
342 |
< |
dclear(vp->name); |
343 |
< |
#ifdef OUTCHAN |
339 |
> |
if (incontext(vp->name)) |
340 |
> |
if (lvl >= 2) |
341 |
> |
dremove(vp->name); |
342 |
> |
else |
343 |
> |
dclear(vp->name); |
344 |
|
if (lvl >= 1) { |
345 |
|
for (ep = outchan; ep != NULL; ep = ep->sibling) |
346 |
|
epfree(ep); |
347 |
|
outchan = NULL; |
348 |
|
} |
293 |
– |
#endif |
349 |
|
} |
350 |
|
|
351 |
|
|
356 |
|
register VARDEF *vp; |
357 |
|
|
358 |
|
if ((vp = varlookup(name)) == NULL) |
359 |
< |
return(NULL); |
359 |
> |
return(NULL); |
360 |
|
return(vp->def); |
361 |
|
} |
362 |
|
|
365 |
|
varlookup(name) /* look up a variable */ |
366 |
|
char *name; |
367 |
|
{ |
368 |
< |
int lvl = 0; |
368 |
> |
int lvl = 0; |
369 |
|
register char *qname; |
370 |
|
register VARDEF *vp; |
371 |
< |
/* find most qualified match */ |
371 |
> |
/* find most qualified match */ |
372 |
|
while ((qname = qualname(name, lvl++)) != NULL) |
373 |
|
for (vp = hashtbl[hash(qname)]; vp != NULL; vp = vp->next) |
374 |
|
if (!strcmp(vp->name, qname)) |
382 |
|
char *name; |
383 |
|
{ |
384 |
|
register VARDEF *vp; |
385 |
< |
int hv; |
385 |
> |
int hv; |
386 |
|
|
387 |
|
if ((vp = varlookup(name)) != NULL) { |
388 |
|
vp->nlinks++; |
389 |
|
return(vp); |
390 |
|
} |
336 |
– |
name = qualname(name, 0); /* use fully qualified name */ |
337 |
– |
hv = hash(name); |
391 |
|
vp = (VARDEF *)emalloc(sizeof(VARDEF)); |
392 |
+ |
vp->lib = liblookup(name); |
393 |
+ |
if (vp->lib == NULL) /* if name not in library */ |
394 |
+ |
name = qualname(name, 0); /* use fully qualified version */ |
395 |
+ |
hv = hash(name); |
396 |
|
vp->name = savestr(name); |
397 |
|
vp->nlinks = 1; |
398 |
|
vp->def = NULL; |
342 |
– |
vp->lib = NULL; |
399 |
|
vp->next = hashtbl[hv]; |
400 |
|
hashtbl[hv] = vp; |
401 |
|
return(vp); |
402 |
|
} |
403 |
|
|
404 |
|
|
405 |
+ |
void |
406 |
+ |
libupdate(fn) /* update library links */ |
407 |
+ |
char *fn; |
408 |
+ |
{ |
409 |
+ |
register int i; |
410 |
+ |
register VARDEF *vp; |
411 |
+ |
/* if fn is NULL then relink all */ |
412 |
+ |
for (i = 0; i < NHASH; i++) |
413 |
+ |
for (vp = hashtbl[i]; vp != NULL; vp = vp->next) |
414 |
+ |
if (vp->lib != NULL || fn == NULL || !strcmp(fn, vp->name)) |
415 |
+ |
vp->lib = liblookup(vp->name); |
416 |
+ |
} |
417 |
+ |
|
418 |
+ |
|
419 |
+ |
void |
420 |
|
varfree(ln) /* release link to variable */ |
421 |
< |
register VARDEF *ln; |
421 |
> |
register VARDEF *ln; |
422 |
|
{ |
423 |
|
register VARDEF *vp; |
424 |
< |
int hv; |
424 |
> |
int hv; |
425 |
|
|
426 |
|
if (--ln->nlinks > 0) |
427 |
< |
return; /* still active */ |
427 |
> |
return; /* still active */ |
428 |
|
|
429 |
|
hv = hash(ln->name); |
430 |
|
vp = hashtbl[hv]; |
431 |
|
if (vp == ln) |
432 |
< |
hashtbl[hv] = vp->next; |
432 |
> |
hashtbl[hv] = vp->next; |
433 |
|
else { |
434 |
< |
while (vp->next != ln) /* must be in list */ |
435 |
< |
vp = vp->next; |
436 |
< |
vp->next = ln->next; |
434 |
> |
while (vp->next != ln) /* must be in list */ |
435 |
> |
vp = vp->next; |
436 |
> |
vp->next = ln->next; |
437 |
|
} |
438 |
|
freestr(ln->name); |
439 |
|
efree((char *)ln); |
445 |
|
{ |
446 |
|
htndx = 0; |
447 |
|
htpos = NULL; |
377 |
– |
#ifdef OUTCHAN |
448 |
|
ochpos = outchan; |
379 |
– |
#endif |
449 |
|
return(dnext()); |
450 |
|
} |
451 |
|
|
454 |
|
dnext() /* return pointer to next definition */ |
455 |
|
{ |
456 |
|
register EPNODE *ep; |
457 |
+ |
register char *nm; |
458 |
|
|
459 |
|
while (htndx < NHASH) { |
460 |
< |
if (htpos == NULL) |
461 |
< |
htpos = hashtbl[htndx++]; |
462 |
< |
while (htpos != NULL) { |
463 |
< |
ep = htpos->def; |
464 |
< |
htpos = htpos->next; |
465 |
< |
if (ep != NULL) |
466 |
< |
return(ep); |
467 |
< |
} |
460 |
> |
if (htpos == NULL) |
461 |
> |
htpos = hashtbl[htndx++]; |
462 |
> |
while (htpos != NULL) { |
463 |
> |
ep = htpos->def; |
464 |
> |
nm = htpos->name; |
465 |
> |
htpos = htpos->next; |
466 |
> |
if (ep != NULL && incontext(nm)) |
467 |
> |
return(ep); |
468 |
> |
} |
469 |
|
} |
399 |
– |
#ifdef OUTCHAN |
470 |
|
if ((ep = ochpos) != NULL) |
471 |
< |
ochpos = ep->sibling; |
471 |
> |
ochpos = ep->sibling; |
472 |
|
return(ep); |
403 |
– |
#else |
404 |
– |
return(NULL); |
405 |
– |
#endif |
473 |
|
} |
474 |
|
|
475 |
|
|
481 |
|
register EPNODE *dp; |
482 |
|
|
483 |
|
if ((vp = varlookup(name)) == NULL || vp->def == NULL) |
484 |
< |
return(NULL); |
484 |
> |
return(NULL); |
485 |
|
dp = vp->def; |
486 |
|
vp->def = dp->sibling; |
487 |
|
varfree(vp); |
489 |
|
} |
490 |
|
|
491 |
|
|
492 |
+ |
void |
493 |
|
dpush(nm, ep) /* push on a definition */ |
494 |
|
char *nm; |
495 |
< |
register EPNODE *ep; |
495 |
> |
register EPNODE *ep; |
496 |
|
{ |
497 |
|
register VARDEF *vp; |
498 |
|
|
502 |
|
} |
503 |
|
|
504 |
|
|
505 |
< |
#ifdef OUTCHAN |
505 |
> |
void |
506 |
|
addchan(sp) /* add an output channel assignment */ |
507 |
< |
EPNODE *sp; |
507 |
> |
EPNODE *sp; |
508 |
|
{ |
509 |
< |
int ch = sp->v.kid->v.chan; |
509 |
> |
int ch = sp->v.kid->v.chan; |
510 |
|
register EPNODE *ep, *epl; |
511 |
|
|
512 |
|
for (epl = NULL, ep = outchan; ep != NULL; epl = ep, ep = ep->sibling) |
530 |
|
sp->sibling = NULL; |
531 |
|
|
532 |
|
} |
465 |
– |
#endif |
533 |
|
|
534 |
|
|
535 |
+ |
void |
536 |
|
getstatement() /* get next statement */ |
537 |
|
{ |
538 |
|
register EPNODE *ep; |
539 |
|
char *qname; |
540 |
< |
EPNODE *lastdef; |
540 |
> |
register VARDEF *vdef; |
541 |
|
|
542 |
|
if (nextc == ';') { /* empty statement */ |
543 |
|
scan(); |
544 |
|
return; |
545 |
|
} |
546 |
< |
#ifdef OUTCHAN |
547 |
< |
if (nextc == '$') { /* channel assignment */ |
546 |
> |
if (esupport&E_OUTCHAN && |
547 |
> |
nextc == '$') { /* channel assignment */ |
548 |
|
ep = getchan(); |
549 |
|
addchan(ep); |
550 |
< |
} else |
483 |
< |
#endif |
484 |
< |
{ /* ordinary definition */ |
550 |
> |
} else { /* ordinary definition */ |
551 |
|
ep = getdefn(); |
552 |
|
qname = qualname(dname(ep), 0); |
553 |
< |
#ifdef REDEFW |
554 |
< |
if ((lastdef = dlookup(qname)) != NULL) { |
555 |
< |
wputs(qname); |
556 |
< |
if (lastdef->type == ':') |
557 |
< |
wputs(": redefined constant expression\n"); |
558 |
< |
else |
559 |
< |
wputs(": redefined\n"); |
560 |
< |
} |
561 |
< |
#ifdef FUNCTION |
562 |
< |
else if (ep->v.kid->type == FUNC && liblookup(qname) != NULL) { |
563 |
< |
wputs(qname); |
498 |
< |
wputs(": definition hides library function\n"); |
499 |
< |
} |
500 |
< |
#endif |
501 |
< |
#endif |
553 |
> |
if (esupport&E_REDEFW && (vdef = varlookup(qname)) != NULL) |
554 |
> |
if (vdef->def != NULL && epcmp(ep, vdef->def)) { |
555 |
> |
wputs(qname); |
556 |
> |
if (vdef->def->type == ':') |
557 |
> |
wputs(": redefined constant expression\n"); |
558 |
> |
else |
559 |
> |
wputs(": redefined\n"); |
560 |
> |
} else if (ep->v.kid->type == FUNC && vdef->lib != NULL) { |
561 |
> |
wputs(qname); |
562 |
> |
wputs(": definition hides library function\n"); |
563 |
> |
} |
564 |
|
if (ep->type == ':') |
565 |
|
dremove(qname); |
566 |
|
else |
578 |
|
EPNODE * |
579 |
|
getdefn() /* A -> SYM = E1 */ |
580 |
|
/* SYM : E1 */ |
581 |
< |
/* FUNC(SYM,..) = E1 */ |
581 |
> |
/* FUNC(SYM,..) = E1 */ |
582 |
|
/* FUNC(SYM,..) : E1 */ |
583 |
|
{ |
584 |
|
register EPNODE *ep1, *ep2; |
585 |
|
|
586 |
< |
if (!isalpha(nextc)) |
586 |
> |
if (!isalpha(nextc) && nextc != CNTXMARK) |
587 |
|
syntax("illegal variable name"); |
588 |
|
|
589 |
|
ep1 = newnode(); |
590 |
|
ep1->type = SYM; |
591 |
|
ep1->v.name = savestr(getname()); |
592 |
|
|
593 |
< |
#ifdef FUNCTION |
532 |
< |
if (nextc == '(') { |
593 |
> |
if (esupport&E_FUNCTION && nextc == '(') { |
594 |
|
ep2 = newnode(); |
595 |
|
ep2->type = FUNC; |
596 |
|
addekid(ep2, ep1); |
608 |
|
syntax("')' expected"); |
609 |
|
scan(); |
610 |
|
curfunc = ep1; |
611 |
< |
} else |
551 |
< |
curfunc = NULL; |
552 |
< |
#endif |
611 |
> |
} |
612 |
|
|
613 |
|
if (nextc != '=' && nextc != ':') |
614 |
|
syntax("'=' or ':' expected"); |
619 |
|
addekid(ep2, ep1); |
620 |
|
addekid(ep2, getE1()); |
621 |
|
|
622 |
< |
if ( |
564 |
< |
#ifdef FUNCTION |
565 |
< |
ep1->type == SYM && |
566 |
< |
#endif |
567 |
< |
ep1->sibling->type != NUM) { |
622 |
> |
if (ep1->type == SYM && ep1->sibling->type != NUM) { |
623 |
|
ep1 = newnode(); |
624 |
|
ep1->type = TICK; |
625 |
< |
ep1->v.tick = -1; |
625 |
> |
ep1->v.tick = 0; |
626 |
|
addekid(ep2, ep1); |
627 |
|
ep1 = newnode(); |
628 |
|
ep1->type = NUM; |
629 |
|
addekid(ep2, ep1); |
630 |
|
} |
631 |
+ |
curfunc = NULL; |
632 |
|
|
633 |
|
return(ep2); |
634 |
|
} |
635 |
|
|
636 |
|
|
581 |
– |
#ifdef OUTCHAN |
637 |
|
EPNODE * |
638 |
|
getchan() /* A -> $N = E1 */ |
639 |
|
{ |
658 |
|
|
659 |
|
return(ep2); |
660 |
|
} |
606 |
– |
#endif |
661 |
|
|
662 |
|
|
663 |
|
|
669 |
|
static double |
670 |
|
dvalue(name, d) /* evaluate a variable */ |
671 |
|
char *name; |
672 |
< |
EPNODE *d; |
672 |
> |
EPNODE *d; |
673 |
|
{ |
674 |
|
register EPNODE *ep1, *ep2; |
675 |
|
|
682 |
|
if (ep1->type == NUM) |
683 |
|
return(ep1->v.num); /* return if number */ |
684 |
|
ep2 = ep1->sibling; /* check time */ |
685 |
< |
if (ep2->v.tick < 0 || ep2->v.tick < eclock) { |
686 |
< |
ep2->v.tick = d->type == ':' ? 1L<<30 : eclock; |
685 |
> |
if (eclock >= MAXCLOCK) |
686 |
> |
eclock = 1; /* wrap clock counter */ |
687 |
> |
if (ep2->v.tick < MAXCLOCK && |
688 |
> |
ep2->v.tick == 0 | ep2->v.tick != eclock) { |
689 |
> |
ep2->v.tick = d->type == ':' ? MAXCLOCK : eclock; |
690 |
|
ep2 = ep2->sibling; |
691 |
|
ep2->v.num = evalue(ep1); /* needs new value */ |
692 |
|
} else |
693 |
|
ep2 = ep2->sibling; /* else reuse old value */ |
694 |
|
|
695 |
|
return(ep2->v.num); |
639 |
– |
} |
640 |
– |
|
641 |
– |
|
642 |
– |
static int |
643 |
– |
hash(s) /* hash a string */ |
644 |
– |
register char *s; |
645 |
– |
{ |
646 |
– |
register int rval = 0; |
647 |
– |
|
648 |
– |
while (*s) |
649 |
– |
rval += *s++; |
650 |
– |
|
651 |
– |
return(rval % NHASH); |
696 |
|
} |