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/* Copyright (c) 1986 Regents of the University of California */ |
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/* Copyright (c) 1992 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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* 1/15/88 Added clock for caching of variable values. |
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* |
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* 11/16/88 Added VARDEF structure for hard linking. |
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* |
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* 5/31/90 Added conditional compile (REDEFW) for redefinition warning. |
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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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#include <stdio.h> |
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#include "calcomp.h" |
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|
33 |
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#ifndef NHASH |
34 |
< |
#define NHASH 521 /* hash size (a prime!) */ |
33 |
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#ifndef NHASH |
34 |
> |
#define NHASH 521 /* hash size (a prime!) */ |
35 |
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#endif |
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|
37 |
< |
#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
37 |
> |
#define hash(s) (shash(s)%NHASH) |
38 |
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|
39 |
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extern char *ecalloc(), *savestr(); |
39 |
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#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
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|
41 |
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extern double dvalue(); |
41 |
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extern char *ecalloc(), *emalloc(), *savestr(), *strcpy(); |
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|
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static double dvalue(); |
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|
45 |
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long eclock = -1; /* value storage timer */ |
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|
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static char context[MAXWORD+1]; /* current context path */ |
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|
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static VARDEF *hashtbl[NHASH]; /* definition list */ |
50 |
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static int htndx; /* index for */ |
51 |
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static VARDEF *htpos; /* ...dfirst() and */ |
52 |
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#ifdef OUTCHAN |
52 |
> |
#ifdef OUTCHAN |
53 |
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static EPNODE *ochpos; /* ...dnext */ |
54 |
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static EPNODE *outchan; |
55 |
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#endif |
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|
57 |
< |
#ifdef FUNCTION |
58 |
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EPNODE *curfunc; |
59 |
< |
#define dname(ep) ((ep)->v.kid->type == SYM ? \ |
57 |
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#ifdef FUNCTION |
58 |
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EPNODE *curfunc; |
59 |
> |
#define dname(ep) ((ep)->v.kid->type == SYM ? \ |
60 |
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(ep)->v.kid->v.name : \ |
61 |
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(ep)->v.kid->v.kid->v.name) |
62 |
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#else |
63 |
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#define dname(ep) ((ep)->v.kid->v.name) |
63 |
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#define dname(ep) ((ep)->v.kid->v.name) |
64 |
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#endif |
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|
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|
76 |
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eputs(": cannot open\n"); |
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quit(1); |
78 |
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} |
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initfile(fname, fp); |
79 |
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initfile(fp, fname, 0); |
80 |
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while (nextc != EOF) |
81 |
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loaddefn(); |
81 |
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getstatement(); |
82 |
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if (fname != NULL) |
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fclose(fp); |
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} |
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|
86 |
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|
87 |
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scompile(file, str) /* get definitions from a string */ |
78 |
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char *file; |
87 |
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scompile(str, fn, ln) /* get definitions from a string */ |
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char *str; |
89 |
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char *fn; |
90 |
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int ln; |
91 |
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{ |
92 |
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initstr(file, str); |
92 |
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initstr(str, fn, ln); |
93 |
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while (nextc != EOF) |
94 |
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loaddefn(); |
94 |
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getstatement(); |
95 |
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} |
96 |
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|
97 |
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|
105 |
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|
106 |
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double |
107 |
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evariable(ep) /* evaluate a variable */ |
108 |
< |
EPNODE *ep; |
108 |
> |
EPNODE *ep; |
109 |
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{ |
110 |
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register VARDEF *dp = ep->v.ln; |
111 |
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|
113 |
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} |
114 |
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115 |
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|
116 |
< |
varset(vname, val) /* set a variable's value */ |
116 |
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varset(vname, assign, val) /* set a variable's value */ |
117 |
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char *vname; |
118 |
< |
double val; |
118 |
> |
int assign; |
119 |
> |
double val; |
120 |
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{ |
121 |
+ |
char *qname; |
122 |
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register EPNODE *ep1, *ep2; |
123 |
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/* get qualified name */ |
124 |
+ |
qname = qualname(vname, 0); |
125 |
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/* check for quick set */ |
126 |
< |
if ((ep1 = dlookup(vname)) != NULL && ep1->v.kid->type == SYM) { |
126 |
> |
if ((ep1 = dlookup(qname)) != NULL && ep1->v.kid->type == SYM) { |
127 |
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ep2 = ep1->v.kid->sibling; |
128 |
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if (ep2->type == NUM) { |
129 |
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ep2->v.num = val; |
130 |
< |
ep2->sibling->v.tick = -1; |
130 |
> |
ep1->type = assign; |
131 |
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return; |
132 |
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} |
133 |
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} |
134 |
|
/* hand build definition */ |
135 |
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ep1 = newnode(); |
136 |
< |
ep1->type = '='; |
136 |
> |
ep1->type = assign; |
137 |
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ep2 = newnode(); |
138 |
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ep2->type = SYM; |
139 |
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ep2->v.name = savestr(vname); |
142 |
|
ep2->type = NUM; |
143 |
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ep2->v.num = val; |
144 |
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addekid(ep1, ep2); |
145 |
< |
ep2 = newnode(); |
146 |
< |
ep2->type = TICK; |
132 |
< |
ep2->v.tick = -1; |
133 |
< |
addekid(ep1, ep2); |
134 |
< |
ep2 = newnode(); |
135 |
< |
ep2->type = NUM; |
136 |
< |
addekid(ep1, ep2); |
137 |
< |
dclear(vname); |
138 |
< |
dpush(ep1); |
145 |
> |
dremove(qname); |
146 |
> |
dpush(qname, ep1); |
147 |
|
} |
148 |
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|
149 |
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|
150 |
< |
dclear(name) /* delete all definitions of name */ |
150 |
> |
dclear(name) /* delete variable definitions of name */ |
151 |
|
char *name; |
152 |
|
{ |
153 |
|
register EPNODE *ep; |
154 |
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|
155 |
+ |
while ((ep = dpop(name)) != NULL) { |
156 |
+ |
if (ep->type == ':') { |
157 |
+ |
dpush(name, ep); /* don't clear constants */ |
158 |
+ |
return; |
159 |
+ |
} |
160 |
+ |
epfree(ep); |
161 |
+ |
} |
162 |
+ |
} |
163 |
+ |
|
164 |
+ |
|
165 |
+ |
dremove(name) /* delete all definitions of name */ |
166 |
+ |
char *name; |
167 |
+ |
{ |
168 |
+ |
register EPNODE *ep; |
169 |
+ |
|
170 |
|
while ((ep = dpop(name)) != NULL) |
171 |
|
epfree(ep); |
172 |
|
} |
181 |
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} |
182 |
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|
183 |
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|
184 |
< |
#ifdef OUTCHAN |
185 |
< |
chanout() /* set output channels */ |
184 |
> |
char * |
185 |
> |
setcontext(ctx) /* set a new context path */ |
186 |
> |
register char *ctx; |
187 |
|
{ |
188 |
+ |
register char *cpp; |
189 |
+ |
|
190 |
+ |
if (ctx == NULL) |
191 |
+ |
return(context); /* just asking */ |
192 |
+ |
while (*ctx == CNTXMARK) |
193 |
+ |
ctx++; /* skip past marks */ |
194 |
+ |
if (!*ctx) { |
195 |
+ |
context[0] = '\0'; /* empty means clear context */ |
196 |
+ |
return(context); |
197 |
+ |
} |
198 |
+ |
cpp = context; /* start context with mark */ |
199 |
+ |
*cpp++ = CNTXMARK; |
200 |
+ |
do { /* carefully copy new context */ |
201 |
+ |
if (cpp >= context+MAXWORD) |
202 |
+ |
break; /* just copy what we can */ |
203 |
+ |
if (isid(*ctx)) |
204 |
+ |
*cpp++ = *ctx++; |
205 |
+ |
else { |
206 |
+ |
*cpp++ = '_'; ctx++; |
207 |
+ |
} |
208 |
+ |
} while (*ctx); |
209 |
+ |
while (cpp[-1] == CNTXMARK) /* cannot end in context mark */ |
210 |
+ |
cpp--; |
211 |
+ |
*cpp = '\0'; |
212 |
+ |
return(context); |
213 |
+ |
} |
214 |
+ |
|
215 |
+ |
|
216 |
+ |
char * |
217 |
+ |
pushcontext(ctx) /* push on another context */ |
218 |
+ |
char *ctx; |
219 |
+ |
{ |
220 |
+ |
extern char *strncpy(), *strcpy(); |
221 |
+ |
char oldcontext[MAXWORD+1]; |
222 |
+ |
register int n; |
223 |
+ |
|
224 |
+ |
strcpy(oldcontext, context); /* save old context */ |
225 |
+ |
setcontext(ctx); /* set new context */ |
226 |
+ |
n = strlen(context); /* tack on old */ |
227 |
+ |
if (n+strlen(oldcontext) > MAXWORD) { |
228 |
+ |
strncpy(context+n, oldcontext, MAXWORD-n); |
229 |
+ |
context[MAXWORD] = '\0'; |
230 |
+ |
} else |
231 |
+ |
strcpy(context+n, oldcontext); |
232 |
+ |
return(context); |
233 |
+ |
} |
234 |
+ |
|
235 |
+ |
|
236 |
+ |
char * |
237 |
+ |
popcontext() /* pop off top context */ |
238 |
+ |
{ |
239 |
+ |
register char *cp1, *cp2; |
240 |
+ |
|
241 |
+ |
if (!context[0]) /* nothing left to pop */ |
242 |
+ |
return(context); |
243 |
+ |
cp2 = context; /* find mark */ |
244 |
+ |
while (*++cp2 && *cp2 != CNTXMARK) |
245 |
+ |
; |
246 |
+ |
cp1 = context; /* copy tail to front */ |
247 |
+ |
while (*cp1++ = *cp2++) |
248 |
+ |
; |
249 |
+ |
return(context); |
250 |
+ |
} |
251 |
+ |
|
252 |
+ |
|
253 |
+ |
char * |
254 |
+ |
qualname(nam, lvl) /* get qualified name */ |
255 |
+ |
register char *nam; |
256 |
+ |
int lvl; |
257 |
+ |
{ |
258 |
+ |
static char nambuf[MAXWORD+1]; |
259 |
+ |
register char *cp = nambuf, *cpp; |
260 |
+ |
/* check for explicit local */ |
261 |
+ |
if (*nam == CNTXMARK) |
262 |
+ |
if (lvl > 0) /* only action is to refuse search */ |
263 |
+ |
return(NULL); |
264 |
+ |
else |
265 |
+ |
nam++; |
266 |
+ |
else if (nam == nambuf) /* check for repeat call */ |
267 |
+ |
return(lvl > 0 ? NULL : nam); |
268 |
+ |
/* copy name to static buffer */ |
269 |
+ |
while (*nam) { |
270 |
+ |
if (cp >= nambuf+MAXWORD) |
271 |
+ |
goto toolong; |
272 |
+ |
*cp++ = *nam++; |
273 |
+ |
} |
274 |
+ |
/* check for explicit global */ |
275 |
+ |
if (cp > nambuf && cp[-1] == CNTXMARK) { |
276 |
+ |
if (lvl > 0) |
277 |
+ |
return(NULL); |
278 |
+ |
*--cp = '\0'; |
279 |
+ |
return(nambuf); /* already qualified */ |
280 |
+ |
} |
281 |
+ |
cpp = context; /* else skip the requested levels */ |
282 |
+ |
while (lvl-- > 0) { |
283 |
+ |
if (!*cpp) |
284 |
+ |
return(NULL); /* return NULL if past global level */ |
285 |
+ |
while (*++cpp && *cpp != CNTXMARK) |
286 |
+ |
; |
287 |
+ |
} |
288 |
+ |
while (*cpp) { /* copy context to static buffer */ |
289 |
+ |
if (cp >= nambuf+MAXWORD) |
290 |
+ |
goto toolong; |
291 |
+ |
*cp++ = *cpp++; |
292 |
+ |
} |
293 |
+ |
toolong: |
294 |
+ |
*cp = '\0'; |
295 |
+ |
return(nambuf); /* return qualified name */ |
296 |
+ |
} |
297 |
+ |
|
298 |
+ |
|
299 |
+ |
incontext(qn) /* is qualified name in current context? */ |
300 |
+ |
register char *qn; |
301 |
+ |
{ |
302 |
+ |
while (*qn && *qn != CNTXMARK) /* find context mark */ |
303 |
+ |
qn++; |
304 |
+ |
return(!strcmp(qn, context)); |
305 |
+ |
} |
306 |
+ |
|
307 |
+ |
|
308 |
+ |
#ifdef OUTCHAN |
309 |
+ |
chanout(cs) /* set output channels */ |
310 |
+ |
int (*cs)(); |
311 |
+ |
{ |
312 |
|
register EPNODE *ep; |
313 |
|
|
314 |
|
for (ep = outchan; ep != NULL; ep = ep->sibling) |
315 |
< |
chanset(ep->v.kid->v.chan, evalue(ep->v.kid->sibling)); |
315 |
> |
(*cs)(ep->v.kid->v.chan, evalue(ep->v.kid->sibling)); |
316 |
|
|
317 |
|
} |
318 |
|
#endif |
319 |
|
|
320 |
|
|
321 |
< |
dclearall() /* clear all definitions */ |
321 |
> |
dcleanup(lvl) /* clear definitions (0->vars,1->output,2->consts) */ |
322 |
> |
int lvl; |
323 |
|
{ |
324 |
|
register int i; |
325 |
|
register VARDEF *vp; |
326 |
|
register EPNODE *ep; |
327 |
< |
|
327 |
> |
/* if context is global, clear all */ |
328 |
|
for (i = 0; i < NHASH; i++) |
329 |
|
for (vp = hashtbl[i]; vp != NULL; vp = vp->next) |
330 |
< |
dclear(vp->name); |
331 |
< |
#ifdef OUTCHAN |
332 |
< |
for (ep = outchan; ep != NULL; ep = ep->sibling) |
333 |
< |
epfree(ep); |
334 |
< |
outchan = NULL; |
330 |
> |
if (!context[0] || incontext(vp->name)) |
331 |
> |
if (lvl >= 2) |
332 |
> |
dremove(vp->name); |
333 |
> |
else |
334 |
> |
dclear(vp->name); |
335 |
> |
#ifdef OUTCHAN |
336 |
> |
if (lvl >= 1) { |
337 |
> |
for (ep = outchan; ep != NULL; ep = ep->sibling) |
338 |
> |
epfree(ep); |
339 |
> |
outchan = NULL; |
340 |
> |
} |
341 |
|
#endif |
342 |
|
} |
343 |
|
|
349 |
|
register VARDEF *vp; |
350 |
|
|
351 |
|
if ((vp = varlookup(name)) == NULL) |
352 |
< |
return(NULL); |
352 |
> |
return(NULL); |
353 |
|
return(vp->def); |
354 |
|
} |
355 |
|
|
358 |
|
varlookup(name) /* look up a variable */ |
359 |
|
char *name; |
360 |
|
{ |
361 |
+ |
int lvl = 0; |
362 |
+ |
register char *qname; |
363 |
|
register VARDEF *vp; |
364 |
< |
|
365 |
< |
for (vp = hashtbl[hash(name)]; vp != NULL; vp = vp->next) |
366 |
< |
if (!strcmp(vp->name, name)) |
367 |
< |
return(vp); |
364 |
> |
/* find most qualified match */ |
365 |
> |
while ((qname = qualname(name, lvl++)) != NULL) |
366 |
> |
for (vp = hashtbl[hash(qname)]; vp != NULL; vp = vp->next) |
367 |
> |
if (!strcmp(vp->name, qname)) |
368 |
> |
return(vp); |
369 |
|
return(NULL); |
370 |
|
} |
371 |
|
|
375 |
|
char *name; |
376 |
|
{ |
377 |
|
register VARDEF *vp; |
378 |
< |
int hv; |
378 |
> |
int hv; |
379 |
|
|
380 |
< |
hv = hash(name); |
381 |
< |
for (vp = hashtbl[hv]; vp != NULL; vp = vp->next) |
382 |
< |
if (!strcmp(vp->name, name)) { |
383 |
< |
vp->nlinks++; |
226 |
< |
return(vp); |
227 |
< |
} |
380 |
> |
if ((vp = varlookup(name)) != NULL) { |
381 |
> |
vp->nlinks++; |
382 |
> |
return(vp); |
383 |
> |
} |
384 |
|
vp = (VARDEF *)emalloc(sizeof(VARDEF)); |
385 |
+ |
#ifdef FUNCTION |
386 |
+ |
vp->lib = liblookup(name); |
387 |
+ |
#else |
388 |
+ |
vp->lib = NULL; |
389 |
+ |
#endif |
390 |
+ |
if (vp->lib == NULL) /* if name not in library */ |
391 |
+ |
name = qualname(name, 0); /* use fully qualified version */ |
392 |
+ |
hv = hash(name); |
393 |
|
vp->name = savestr(name); |
394 |
|
vp->nlinks = 1; |
395 |
|
vp->def = NULL; |
232 |
– |
vp->lib = NULL; |
396 |
|
vp->next = hashtbl[hv]; |
397 |
|
hashtbl[hv] = vp; |
398 |
|
return(vp); |
399 |
|
} |
400 |
|
|
401 |
|
|
402 |
+ |
#ifdef FUNCTION |
403 |
+ |
libupdate(fn) /* update library links */ |
404 |
+ |
char *fn; |
405 |
+ |
{ |
406 |
+ |
register int i; |
407 |
+ |
register VARDEF *vp; |
408 |
+ |
/* if fn is NULL then relink all */ |
409 |
+ |
for (i = 0; i < NHASH; i++) |
410 |
+ |
for (vp = hashtbl[i]; vp != NULL; vp = vp->next) |
411 |
+ |
if (vp->lib != NULL || fn == NULL || !strcmp(fn, vp->name)) |
412 |
+ |
vp->lib = liblookup(vp->name); |
413 |
+ |
} |
414 |
+ |
#endif |
415 |
+ |
|
416 |
+ |
|
417 |
|
varfree(ln) /* release link to variable */ |
418 |
< |
register VARDEF *ln; |
418 |
> |
register VARDEF *ln; |
419 |
|
{ |
420 |
|
register VARDEF *vp; |
421 |
< |
int hv; |
421 |
> |
int hv; |
422 |
|
|
423 |
|
if (--ln->nlinks > 0) |
424 |
< |
return; /* still active */ |
424 |
> |
return; /* still active */ |
425 |
|
|
426 |
|
hv = hash(ln->name); |
427 |
|
vp = hashtbl[hv]; |
428 |
|
if (vp == ln) |
429 |
< |
hashtbl[hv] = vp->next; |
429 |
> |
hashtbl[hv] = vp->next; |
430 |
|
else { |
431 |
< |
while (vp->next != ln) /* must be in list */ |
432 |
< |
vp = vp->next; |
433 |
< |
vp->next = ln->next; |
431 |
> |
while (vp->next != ln) /* must be in list */ |
432 |
> |
vp = vp->next; |
433 |
> |
vp->next = ln->next; |
434 |
|
} |
435 |
|
freestr(ln->name); |
436 |
|
efree((char *)ln); |
442 |
|
{ |
443 |
|
htndx = 0; |
444 |
|
htpos = NULL; |
445 |
< |
#ifdef OUTCHAN |
445 |
> |
#ifdef OUTCHAN |
446 |
|
ochpos = outchan; |
447 |
|
#endif |
448 |
|
return(dnext()); |
453 |
|
dnext() /* return pointer to next definition */ |
454 |
|
{ |
455 |
|
register EPNODE *ep; |
456 |
+ |
register char *nm; |
457 |
|
|
458 |
|
while (htndx < NHASH) { |
459 |
< |
if (htpos == NULL) |
460 |
< |
htpos = hashtbl[htndx++]; |
461 |
< |
while (htpos != NULL) { |
462 |
< |
ep = htpos->def; |
463 |
< |
htpos = htpos->next; |
464 |
< |
if (ep != NULL) |
465 |
< |
return(ep); |
466 |
< |
} |
459 |
> |
if (htpos == NULL) |
460 |
> |
htpos = hashtbl[htndx++]; |
461 |
> |
while (htpos != NULL) { |
462 |
> |
ep = htpos->def; |
463 |
> |
nm = htpos->name; |
464 |
> |
htpos = htpos->next; |
465 |
> |
if (ep != NULL && incontext(nm)) |
466 |
> |
return(ep); |
467 |
> |
} |
468 |
|
} |
469 |
< |
#ifdef OUTCHAN |
469 |
> |
#ifdef OUTCHAN |
470 |
|
if ((ep = ochpos) != NULL) |
471 |
< |
ochpos = ep->sibling; |
471 |
> |
ochpos = ep->sibling; |
472 |
|
return(ep); |
473 |
|
#else |
474 |
|
return(NULL); |
484 |
|
register EPNODE *dp; |
485 |
|
|
486 |
|
if ((vp = varlookup(name)) == NULL || vp->def == NULL) |
487 |
< |
return(NULL); |
487 |
> |
return(NULL); |
488 |
|
dp = vp->def; |
489 |
|
vp->def = dp->sibling; |
490 |
|
varfree(vp); |
492 |
|
} |
493 |
|
|
494 |
|
|
495 |
< |
dpush(ep) /* push on a definition */ |
496 |
< |
register EPNODE *ep; |
495 |
> |
dpush(nm, ep) /* push on a definition */ |
496 |
> |
char *nm; |
497 |
> |
register EPNODE *ep; |
498 |
|
{ |
499 |
|
register VARDEF *vp; |
500 |
|
|
501 |
< |
vp = varinsert(dname(ep)); |
501 |
> |
vp = varinsert(nm); |
502 |
|
ep->sibling = vp->def; |
503 |
|
vp->def = ep; |
504 |
|
} |
505 |
|
|
506 |
|
|
507 |
< |
#ifdef OUTCHAN |
507 |
> |
#ifdef OUTCHAN |
508 |
|
addchan(sp) /* add an output channel assignment */ |
509 |
< |
EPNODE *sp; |
509 |
> |
EPNODE *sp; |
510 |
|
{ |
511 |
< |
int ch = sp->v.kid->v.chan; |
511 |
> |
int ch = sp->v.kid->v.chan; |
512 |
|
register EPNODE *ep, *epl; |
513 |
|
|
514 |
|
for (epl = NULL, ep = outchan; ep != NULL; epl = ep, ep = ep->sibling) |
535 |
|
#endif |
536 |
|
|
537 |
|
|
538 |
< |
loaddefn() /* load next definition */ |
538 |
> |
getstatement() /* get next statement */ |
539 |
|
{ |
540 |
|
register EPNODE *ep; |
541 |
+ |
char *qname; |
542 |
+ |
register VARDEF *vdef; |
543 |
|
|
544 |
|
if (nextc == ';') { /* empty statement */ |
545 |
|
scan(); |
546 |
|
return; |
547 |
|
} |
548 |
< |
#ifdef OUTCHAN |
548 |
> |
#ifdef OUTCHAN |
549 |
|
if (nextc == '$') { /* channel assignment */ |
550 |
|
ep = getchan(); |
551 |
|
addchan(ep); |
553 |
|
#endif |
554 |
|
{ /* ordinary definition */ |
555 |
|
ep = getdefn(); |
556 |
< |
dclear(dname(ep)); |
557 |
< |
dpush(ep); |
556 |
> |
qname = qualname(dname(ep), 0); |
557 |
> |
#ifdef REDEFW |
558 |
> |
if ((vdef = varlookup(qname)) != NULL) |
559 |
> |
if (vdef->def != NULL && epcmp(ep, vdef->def)) { |
560 |
> |
wputs(qname); |
561 |
> |
if (vdef->def->type == ':') |
562 |
> |
wputs(": redefined constant expression\n"); |
563 |
> |
else |
564 |
> |
wputs(": redefined\n"); |
565 |
> |
} |
566 |
> |
#ifdef FUNCTION |
567 |
> |
else if (ep->v.kid->type == FUNC && vdef->lib != NULL) { |
568 |
> |
wputs(qname); |
569 |
> |
wputs(": definition hides library function\n"); |
570 |
> |
} |
571 |
> |
#endif |
572 |
> |
#endif |
573 |
> |
if (ep->type == ':') |
574 |
> |
dremove(qname); |
575 |
> |
else |
576 |
> |
dclear(qname); |
577 |
> |
dpush(qname, ep); |
578 |
|
} |
579 |
|
if (nextc != EOF) { |
580 |
|
if (nextc != ';') |
586 |
|
|
587 |
|
EPNODE * |
588 |
|
getdefn() /* A -> SYM = E1 */ |
589 |
< |
/* FUNC(SYM,..) = E1 */ |
589 |
> |
/* SYM : E1 */ |
590 |
> |
/* FUNC(SYM,..) = E1 */ |
591 |
> |
/* FUNC(SYM,..) : E1 */ |
592 |
|
{ |
593 |
|
register EPNODE *ep1, *ep2; |
594 |
|
|
595 |
< |
if (!isalpha(nextc)) |
595 |
> |
if (!isalpha(nextc) && nextc != CNTXMARK) |
596 |
|
syntax("illegal variable name"); |
597 |
|
|
598 |
|
ep1 = newnode(); |
599 |
|
ep1->type = SYM; |
600 |
|
ep1->v.name = savestr(getname()); |
601 |
|
|
602 |
< |
#ifdef FUNCTION |
602 |
> |
#ifdef FUNCTION |
603 |
|
if (nextc == '(') { |
604 |
|
ep2 = newnode(); |
605 |
|
ep2->type = FUNC; |
622 |
|
curfunc = NULL; |
623 |
|
#endif |
624 |
|
|
625 |
< |
if (nextc != '=') |
626 |
< |
syntax("'=' expected"); |
422 |
< |
scan(); |
625 |
> |
if (nextc != '=' && nextc != ':') |
626 |
> |
syntax("'=' or ':' expected"); |
627 |
|
|
628 |
|
ep2 = newnode(); |
629 |
< |
ep2->type = '='; |
629 |
> |
ep2->type = nextc; |
630 |
> |
scan(); |
631 |
|
addekid(ep2, ep1); |
632 |
|
addekid(ep2, getE1()); |
633 |
|
|
634 |
< |
#ifdef FUNCTION |
635 |
< |
if (ep1->type == SYM) |
634 |
> |
if ( |
635 |
> |
#ifdef FUNCTION |
636 |
> |
ep1->type == SYM && |
637 |
|
#endif |
638 |
< |
{ |
638 |
> |
ep1->sibling->type != NUM) { |
639 |
|
ep1 = newnode(); |
640 |
|
ep1->type = TICK; |
641 |
|
ep1->v.tick = -1; |
649 |
|
} |
650 |
|
|
651 |
|
|
652 |
< |
#ifdef OUTCHAN |
652 |
> |
#ifdef OUTCHAN |
653 |
|
EPNODE * |
654 |
|
getchan() /* A -> $N = E1 */ |
655 |
|
{ |
686 |
|
static double |
687 |
|
dvalue(name, d) /* evaluate a variable */ |
688 |
|
char *name; |
689 |
< |
EPNODE *d; |
689 |
> |
EPNODE *d; |
690 |
|
{ |
691 |
|
register EPNODE *ep1, *ep2; |
692 |
|
|
696 |
|
quit(1); |
697 |
|
} |
698 |
|
ep1 = d->v.kid->sibling; /* get expression */ |
699 |
+ |
if (ep1->type == NUM) |
700 |
+ |
return(ep1->v.num); /* return if number */ |
701 |
|
ep2 = ep1->sibling; /* check time */ |
702 |
|
if (ep2->v.tick < 0 || ep2->v.tick < eclock) { |
703 |
< |
ep2->v.tick = eclock; |
703 |
> |
ep2->v.tick = d->type == ':' ? 1L<<30 : eclock; |
704 |
|
ep2 = ep2->sibling; |
705 |
< |
ep2->v.num = evalue(ep1); /* compute new value */ |
705 |
> |
ep2->v.num = evalue(ep1); /* needs new value */ |
706 |
|
} else |
707 |
< |
ep2 = ep2->sibling; /* reuse old value */ |
707 |
> |
ep2 = ep2->sibling; /* else reuse old value */ |
708 |
|
|
709 |
|
return(ep2->v.num); |
502 |
– |
} |
503 |
– |
|
504 |
– |
|
505 |
– |
static int |
506 |
– |
hash(s) /* hash a string */ |
507 |
– |
register char *s; |
508 |
– |
{ |
509 |
– |
register int rval = 0; |
510 |
– |
|
511 |
– |
while (*s) |
512 |
– |
rval += *s++; |
513 |
– |
|
514 |
– |
return(rval % NHASH); |
710 |
|
} |