1 |
greg |
1.1 |
#ifndef lint |
2 |
schorsch |
2.16 |
static const char RCSid[] = "$Id: caldefn.c,v 2.15 2003/04/27 06:08:03 greg 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 |
|
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* 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 |
|
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* |
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 |
|
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* 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 |
|
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* 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 |
|
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* |
25 |
|
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* 2/19/03 Eliminated conditional compiles in favor of esupport extern. |
26 |
|
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*/ |
27 |
|
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28 |
greg |
2.13 |
#include "copyright.h" |
29 |
greg |
1.1 |
|
30 |
|
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#include <stdio.h> |
31 |
|
|
|
32 |
greg |
2.12 |
#include <string.h> |
33 |
|
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|
34 |
greg |
1.1 |
#include <ctype.h> |
35 |
|
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|
36 |
|
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#include "calcomp.h" |
37 |
|
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|
38 |
greg |
2.4 |
#ifndef NHASH |
39 |
|
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#define NHASH 521 /* hash size (a prime!) */ |
40 |
greg |
1.1 |
#endif |
41 |
|
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|
42 |
greg |
2.5 |
#define hash(s) (shash(s)%NHASH) |
43 |
|
|
|
44 |
greg |
2.4 |
#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
45 |
greg |
1.1 |
|
46 |
greg |
2.12 |
static double dvalue(); |
47 |
greg |
1.1 |
|
48 |
greg |
2.12 |
#define MAXCLOCK (1L<<31) /* clock wrap value */ |
49 |
greg |
1.1 |
|
50 |
greg |
2.8 |
unsigned long eclock = 0; /* value storage timer */ |
51 |
greg |
1.1 |
|
52 |
greg |
2.11 |
#define MAXCNTX 1023 /* maximum context length */ |
53 |
greg |
1.13 |
|
54 |
greg |
2.11 |
static char context[MAXCNTX+1]; /* current context path */ |
55 |
|
|
|
56 |
greg |
1.1 |
static VARDEF *hashtbl[NHASH]; /* definition list */ |
57 |
|
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static int htndx; /* index for */ |
58 |
|
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static VARDEF *htpos; /* ...dfirst() and */ |
59 |
|
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static EPNODE *ochpos; /* ...dnext */ |
60 |
|
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static EPNODE *outchan; |
61 |
|
|
|
62 |
greg |
2.10 |
EPNODE *curfunc = NULL; |
63 |
greg |
2.4 |
#define dname(ep) ((ep)->v.kid->type == SYM ? \ |
64 |
greg |
1.1 |
(ep)->v.kid->v.name : \ |
65 |
|
|
(ep)->v.kid->v.kid->v.name) |
66 |
|
|
|
67 |
|
|
|
68 |
greg |
2.12 |
void |
69 |
schorsch |
2.16 |
fcompile( /* get definitions from a file */ |
70 |
|
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char *fname |
71 |
|
|
) |
72 |
greg |
1.1 |
{ |
73 |
|
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FILE *fp; |
74 |
|
|
|
75 |
|
|
if (fname == NULL) |
76 |
|
|
fp = stdin; |
77 |
|
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else if ((fp = fopen(fname, "r")) == NULL) { |
78 |
|
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eputs(fname); |
79 |
|
|
eputs(": cannot open\n"); |
80 |
|
|
quit(1); |
81 |
|
|
} |
82 |
greg |
1.4 |
initfile(fp, fname, 0); |
83 |
greg |
1.1 |
while (nextc != EOF) |
84 |
greg |
1.13 |
getstatement(); |
85 |
greg |
1.1 |
if (fname != NULL) |
86 |
|
|
fclose(fp); |
87 |
|
|
} |
88 |
|
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|
89 |
|
|
|
90 |
greg |
2.12 |
void |
91 |
schorsch |
2.16 |
scompile( /* get definitions from a string */ |
92 |
|
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char *str, |
93 |
|
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char *fn, |
94 |
|
|
int ln |
95 |
|
|
) |
96 |
greg |
1.1 |
{ |
97 |
greg |
1.4 |
initstr(str, fn, ln); |
98 |
greg |
1.1 |
while (nextc != EOF) |
99 |
greg |
1.13 |
getstatement(); |
100 |
greg |
1.1 |
} |
101 |
|
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|
102 |
|
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|
103 |
|
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double |
104 |
schorsch |
2.16 |
varvalue( /* return a variable's value */ |
105 |
|
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char *vname |
106 |
|
|
) |
107 |
greg |
1.1 |
{ |
108 |
|
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return(dvalue(vname, dlookup(vname))); |
109 |
|
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} |
110 |
|
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|
111 |
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|
112 |
|
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double |
113 |
schorsch |
2.16 |
evariable( /* evaluate a variable */ |
114 |
|
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EPNODE *ep |
115 |
|
|
) |
116 |
greg |
1.1 |
{ |
117 |
|
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register VARDEF *dp = ep->v.ln; |
118 |
|
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|
119 |
|
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return(dvalue(dp->name, dp->def)); |
120 |
|
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} |
121 |
|
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|
122 |
|
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|
123 |
greg |
2.12 |
void |
124 |
schorsch |
2.16 |
varset( /* set a variable's value */ |
125 |
|
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char *vname, |
126 |
|
|
int assign, |
127 |
|
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double val |
128 |
|
|
) |
129 |
greg |
1.1 |
{ |
130 |
greg |
1.13 |
char *qname; |
131 |
greg |
1.1 |
register EPNODE *ep1, *ep2; |
132 |
greg |
1.13 |
/* get qualified name */ |
133 |
|
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qname = qualname(vname, 0); |
134 |
greg |
1.1 |
/* check for quick set */ |
135 |
greg |
1.13 |
if ((ep1 = dlookup(qname)) != NULL && ep1->v.kid->type == SYM) { |
136 |
greg |
1.1 |
ep2 = ep1->v.kid->sibling; |
137 |
|
|
if (ep2->type == NUM) { |
138 |
|
|
ep2->v.num = val; |
139 |
greg |
1.8 |
ep1->type = assign; |
140 |
greg |
1.1 |
return; |
141 |
|
|
} |
142 |
|
|
} |
143 |
|
|
/* hand build definition */ |
144 |
|
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ep1 = newnode(); |
145 |
greg |
1.8 |
ep1->type = assign; |
146 |
greg |
1.1 |
ep2 = newnode(); |
147 |
|
|
ep2->type = SYM; |
148 |
|
|
ep2->v.name = savestr(vname); |
149 |
|
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addekid(ep1, ep2); |
150 |
|
|
ep2 = newnode(); |
151 |
|
|
ep2->type = NUM; |
152 |
|
|
ep2->v.num = val; |
153 |
|
|
addekid(ep1, ep2); |
154 |
greg |
1.13 |
dremove(qname); |
155 |
|
|
dpush(qname, ep1); |
156 |
greg |
1.1 |
} |
157 |
|
|
|
158 |
|
|
|
159 |
greg |
2.12 |
void |
160 |
schorsch |
2.16 |
dclear( /* delete variable definitions of name */ |
161 |
|
|
char *name |
162 |
|
|
) |
163 |
greg |
1.1 |
{ |
164 |
|
|
register EPNODE *ep; |
165 |
|
|
|
166 |
greg |
1.8 |
while ((ep = dpop(name)) != NULL) { |
167 |
|
|
if (ep->type == ':') { |
168 |
greg |
1.13 |
dpush(name, ep); /* don't clear constants */ |
169 |
greg |
1.8 |
return; |
170 |
|
|
} |
171 |
|
|
epfree(ep); |
172 |
|
|
} |
173 |
|
|
} |
174 |
|
|
|
175 |
|
|
|
176 |
greg |
2.12 |
void |
177 |
schorsch |
2.16 |
dremove( /* delete all definitions of name */ |
178 |
|
|
char *name |
179 |
|
|
) |
180 |
greg |
1.8 |
{ |
181 |
|
|
register EPNODE *ep; |
182 |
|
|
|
183 |
greg |
1.1 |
while ((ep = dpop(name)) != NULL) |
184 |
|
|
epfree(ep); |
185 |
|
|
} |
186 |
|
|
|
187 |
|
|
|
188 |
greg |
2.12 |
int |
189 |
schorsch |
2.16 |
vardefined( /* return non-zero if variable defined */ |
190 |
|
|
char *name |
191 |
|
|
) |
192 |
greg |
1.1 |
{ |
193 |
|
|
register EPNODE *dp; |
194 |
|
|
|
195 |
|
|
return((dp = dlookup(name)) != NULL && dp->v.kid->type == SYM); |
196 |
|
|
} |
197 |
|
|
|
198 |
|
|
|
199 |
greg |
1.13 |
char * |
200 |
schorsch |
2.16 |
setcontext( /* set a new context path */ |
201 |
|
|
register char *ctx |
202 |
|
|
) |
203 |
greg |
1.13 |
{ |
204 |
|
|
register char *cpp; |
205 |
|
|
|
206 |
|
|
if (ctx == NULL) |
207 |
|
|
return(context); /* just asking */ |
208 |
greg |
2.6 |
while (*ctx == CNTXMARK) |
209 |
|
|
ctx++; /* skip past marks */ |
210 |
greg |
1.13 |
if (!*ctx) { |
211 |
greg |
2.6 |
context[0] = '\0'; /* empty means clear context */ |
212 |
greg |
1.13 |
return(context); |
213 |
|
|
} |
214 |
greg |
2.6 |
cpp = context; /* start context with mark */ |
215 |
|
|
*cpp++ = CNTXMARK; |
216 |
|
|
do { /* carefully copy new context */ |
217 |
greg |
2.11 |
if (cpp >= context+MAXCNTX) |
218 |
greg |
1.18 |
break; /* just copy what we can */ |
219 |
greg |
1.13 |
if (isid(*ctx)) |
220 |
|
|
*cpp++ = *ctx++; |
221 |
|
|
else { |
222 |
|
|
*cpp++ = '_'; ctx++; |
223 |
|
|
} |
224 |
|
|
} while (*ctx); |
225 |
greg |
2.6 |
while (cpp[-1] == CNTXMARK) /* cannot end in context mark */ |
226 |
|
|
cpp--; |
227 |
greg |
1.13 |
*cpp = '\0'; |
228 |
greg |
2.6 |
return(context); |
229 |
|
|
} |
230 |
|
|
|
231 |
|
|
|
232 |
|
|
char * |
233 |
schorsch |
2.16 |
pushcontext( /* push on another context */ |
234 |
|
|
char *ctx |
235 |
|
|
) |
236 |
greg |
2.6 |
{ |
237 |
greg |
2.11 |
char oldcontext[MAXCNTX+1]; |
238 |
greg |
2.6 |
register int n; |
239 |
|
|
|
240 |
|
|
strcpy(oldcontext, context); /* save old context */ |
241 |
|
|
setcontext(ctx); /* set new context */ |
242 |
|
|
n = strlen(context); /* tack on old */ |
243 |
greg |
2.11 |
if (n+strlen(oldcontext) > MAXCNTX) { |
244 |
|
|
strncpy(context+n, oldcontext, MAXCNTX-n); |
245 |
|
|
context[MAXCNTX] = '\0'; |
246 |
greg |
2.6 |
} else |
247 |
|
|
strcpy(context+n, oldcontext); |
248 |
|
|
return(context); |
249 |
|
|
} |
250 |
|
|
|
251 |
|
|
|
252 |
|
|
char * |
253 |
schorsch |
2.16 |
popcontext(void) /* pop off top context */ |
254 |
greg |
2.6 |
{ |
255 |
|
|
register char *cp1, *cp2; |
256 |
|
|
|
257 |
|
|
if (!context[0]) /* nothing left to pop */ |
258 |
|
|
return(context); |
259 |
|
|
cp2 = context; /* find mark */ |
260 |
|
|
while (*++cp2 && *cp2 != CNTXMARK) |
261 |
|
|
; |
262 |
|
|
cp1 = context; /* copy tail to front */ |
263 |
|
|
while (*cp1++ = *cp2++) |
264 |
|
|
; |
265 |
greg |
1.13 |
return(context); |
266 |
|
|
} |
267 |
|
|
|
268 |
|
|
|
269 |
|
|
char * |
270 |
schorsch |
2.16 |
qualname( /* get qualified name */ |
271 |
|
|
register char *nam, |
272 |
|
|
int lvl |
273 |
|
|
) |
274 |
greg |
1.13 |
{ |
275 |
greg |
2.4 |
static char nambuf[MAXWORD+1]; |
276 |
greg |
1.17 |
register char *cp = nambuf, *cpp; |
277 |
|
|
/* check for explicit local */ |
278 |
greg |
1.15 |
if (*nam == CNTXMARK) |
279 |
greg |
1.17 |
if (lvl > 0) /* only action is to refuse search */ |
280 |
|
|
return(NULL); |
281 |
|
|
else |
282 |
|
|
nam++; |
283 |
|
|
else if (nam == nambuf) /* check for repeat call */ |
284 |
|
|
return(lvl > 0 ? NULL : nam); |
285 |
greg |
1.13 |
/* copy name to static buffer */ |
286 |
|
|
while (*nam) { |
287 |
greg |
1.18 |
if (cp >= nambuf+MAXWORD) |
288 |
greg |
1.13 |
goto toolong; |
289 |
greg |
1.17 |
*cp++ = *nam++; |
290 |
greg |
1.13 |
} |
291 |
greg |
1.17 |
/* check for explicit global */ |
292 |
|
|
if (cp > nambuf && cp[-1] == CNTXMARK) { |
293 |
greg |
1.13 |
if (lvl > 0) |
294 |
greg |
1.17 |
return(NULL); |
295 |
|
|
*--cp = '\0'; |
296 |
|
|
return(nambuf); /* already qualified */ |
297 |
|
|
} |
298 |
|
|
cpp = context; /* else skip the requested levels */ |
299 |
|
|
while (lvl-- > 0) { |
300 |
|
|
if (!*cpp) |
301 |
|
|
return(NULL); /* return NULL if past global level */ |
302 |
|
|
while (*++cpp && *cpp != CNTXMARK) |
303 |
|
|
; |
304 |
|
|
} |
305 |
greg |
1.13 |
while (*cpp) { /* copy context to static buffer */ |
306 |
greg |
1.18 |
if (cp >= nambuf+MAXWORD) |
307 |
greg |
1.13 |
goto toolong; |
308 |
|
|
*cp++ = *cpp++; |
309 |
|
|
} |
310 |
greg |
1.18 |
toolong: |
311 |
greg |
1.13 |
*cp = '\0'; |
312 |
|
|
return(nambuf); /* return qualified name */ |
313 |
|
|
} |
314 |
|
|
|
315 |
|
|
|
316 |
greg |
2.12 |
int |
317 |
schorsch |
2.16 |
incontext( /* is qualified name in current context? */ |
318 |
|
|
register char *qn |
319 |
|
|
) |
320 |
greg |
1.14 |
{ |
321 |
greg |
2.9 |
if (!context[0]) /* global context accepts all */ |
322 |
|
|
return(1); |
323 |
greg |
1.14 |
while (*qn && *qn != CNTXMARK) /* find context mark */ |
324 |
greg |
1.19 |
qn++; |
325 |
greg |
1.14 |
return(!strcmp(qn, context)); |
326 |
|
|
} |
327 |
|
|
|
328 |
|
|
|
329 |
greg |
2.12 |
void |
330 |
schorsch |
2.16 |
chanout( /* set output channels */ |
331 |
|
|
void (*cs)(int n, double v) |
332 |
|
|
) |
333 |
greg |
1.1 |
{ |
334 |
|
|
register EPNODE *ep; |
335 |
|
|
|
336 |
|
|
for (ep = outchan; ep != NULL; ep = ep->sibling) |
337 |
greg |
1.6 |
(*cs)(ep->v.kid->v.chan, evalue(ep->v.kid->sibling)); |
338 |
greg |
1.1 |
|
339 |
|
|
} |
340 |
|
|
|
341 |
|
|
|
342 |
greg |
2.12 |
void |
343 |
schorsch |
2.16 |
dcleanup( /* clear definitions (0->vars,1->output,2->consts) */ |
344 |
|
|
int lvl |
345 |
|
|
) |
346 |
greg |
1.1 |
{ |
347 |
|
|
register int i; |
348 |
|
|
register VARDEF *vp; |
349 |
|
|
register EPNODE *ep; |
350 |
greg |
1.14 |
/* if context is global, clear all */ |
351 |
greg |
1.1 |
for (i = 0; i < NHASH; i++) |
352 |
|
|
for (vp = hashtbl[i]; vp != NULL; vp = vp->next) |
353 |
greg |
2.9 |
if (incontext(vp->name)) |
354 |
greg |
1.14 |
if (lvl >= 2) |
355 |
|
|
dremove(vp->name); |
356 |
|
|
else |
357 |
|
|
dclear(vp->name); |
358 |
greg |
1.12 |
if (lvl >= 1) { |
359 |
greg |
1.9 |
for (ep = outchan; ep != NULL; ep = ep->sibling) |
360 |
|
|
epfree(ep); |
361 |
|
|
outchan = NULL; |
362 |
|
|
} |
363 |
greg |
1.1 |
} |
364 |
|
|
|
365 |
|
|
|
366 |
|
|
EPNODE * |
367 |
schorsch |
2.16 |
dlookup( /* look up a definition */ |
368 |
|
|
char *name |
369 |
|
|
) |
370 |
greg |
1.1 |
{ |
371 |
|
|
register VARDEF *vp; |
372 |
|
|
|
373 |
|
|
if ((vp = varlookup(name)) == NULL) |
374 |
greg |
2.4 |
return(NULL); |
375 |
greg |
1.1 |
return(vp->def); |
376 |
|
|
} |
377 |
|
|
|
378 |
|
|
|
379 |
|
|
VARDEF * |
380 |
schorsch |
2.16 |
varlookup( /* look up a variable */ |
381 |
|
|
char *name |
382 |
|
|
) |
383 |
greg |
1.1 |
{ |
384 |
greg |
2.4 |
int lvl = 0; |
385 |
greg |
1.13 |
register char *qname; |
386 |
greg |
1.1 |
register VARDEF *vp; |
387 |
greg |
2.4 |
/* find most qualified match */ |
388 |
greg |
1.13 |
while ((qname = qualname(name, lvl++)) != NULL) |
389 |
|
|
for (vp = hashtbl[hash(qname)]; vp != NULL; vp = vp->next) |
390 |
|
|
if (!strcmp(vp->name, qname)) |
391 |
|
|
return(vp); |
392 |
greg |
1.1 |
return(NULL); |
393 |
|
|
} |
394 |
|
|
|
395 |
|
|
|
396 |
|
|
VARDEF * |
397 |
schorsch |
2.16 |
varinsert( /* get a link to a variable */ |
398 |
|
|
char *name |
399 |
|
|
) |
400 |
greg |
1.1 |
{ |
401 |
|
|
register VARDEF *vp; |
402 |
greg |
2.4 |
int hv; |
403 |
greg |
1.1 |
|
404 |
greg |
1.13 |
if ((vp = varlookup(name)) != NULL) { |
405 |
|
|
vp->nlinks++; |
406 |
|
|
return(vp); |
407 |
|
|
} |
408 |
greg |
2.3 |
vp = (VARDEF *)emalloc(sizeof(VARDEF)); |
409 |
|
|
vp->lib = liblookup(name); |
410 |
|
|
if (vp->lib == NULL) /* if name not in library */ |
411 |
greg |
1.16 |
name = qualname(name, 0); /* use fully qualified version */ |
412 |
greg |
1.1 |
hv = hash(name); |
413 |
|
|
vp->name = savestr(name); |
414 |
|
|
vp->nlinks = 1; |
415 |
|
|
vp->def = NULL; |
416 |
|
|
vp->next = hashtbl[hv]; |
417 |
|
|
hashtbl[hv] = vp; |
418 |
|
|
return(vp); |
419 |
|
|
} |
420 |
greg |
2.2 |
|
421 |
|
|
|
422 |
greg |
2.12 |
void |
423 |
schorsch |
2.16 |
libupdate( /* update library links */ |
424 |
|
|
char *fn |
425 |
|
|
) |
426 |
greg |
2.2 |
{ |
427 |
|
|
register int i; |
428 |
|
|
register VARDEF *vp; |
429 |
|
|
/* if fn is NULL then relink all */ |
430 |
|
|
for (i = 0; i < NHASH; i++) |
431 |
|
|
for (vp = hashtbl[i]; vp != NULL; vp = vp->next) |
432 |
|
|
if (vp->lib != NULL || fn == NULL || !strcmp(fn, vp->name)) |
433 |
|
|
vp->lib = liblookup(vp->name); |
434 |
|
|
} |
435 |
greg |
1.1 |
|
436 |
|
|
|
437 |
greg |
2.12 |
void |
438 |
schorsch |
2.16 |
varfree( /* release link to variable */ |
439 |
|
|
register VARDEF *ln |
440 |
|
|
) |
441 |
greg |
1.1 |
{ |
442 |
|
|
register VARDEF *vp; |
443 |
greg |
2.4 |
int hv; |
444 |
greg |
1.1 |
|
445 |
|
|
if (--ln->nlinks > 0) |
446 |
greg |
2.4 |
return; /* still active */ |
447 |
greg |
1.1 |
|
448 |
|
|
hv = hash(ln->name); |
449 |
|
|
vp = hashtbl[hv]; |
450 |
|
|
if (vp == ln) |
451 |
greg |
2.4 |
hashtbl[hv] = vp->next; |
452 |
greg |
1.1 |
else { |
453 |
greg |
2.4 |
while (vp->next != ln) /* must be in list */ |
454 |
|
|
vp = vp->next; |
455 |
|
|
vp->next = ln->next; |
456 |
greg |
1.1 |
} |
457 |
|
|
freestr(ln->name); |
458 |
|
|
efree((char *)ln); |
459 |
|
|
} |
460 |
|
|
|
461 |
|
|
|
462 |
|
|
EPNODE * |
463 |
schorsch |
2.16 |
dfirst(void) /* return pointer to first definition */ |
464 |
greg |
1.1 |
{ |
465 |
|
|
htndx = 0; |
466 |
|
|
htpos = NULL; |
467 |
|
|
ochpos = outchan; |
468 |
|
|
return(dnext()); |
469 |
|
|
} |
470 |
|
|
|
471 |
|
|
|
472 |
|
|
EPNODE * |
473 |
schorsch |
2.16 |
dnext(void) /* return pointer to next definition */ |
474 |
greg |
1.1 |
{ |
475 |
|
|
register EPNODE *ep; |
476 |
greg |
1.19 |
register char *nm; |
477 |
greg |
1.1 |
|
478 |
|
|
while (htndx < NHASH) { |
479 |
greg |
2.4 |
if (htpos == NULL) |
480 |
|
|
htpos = hashtbl[htndx++]; |
481 |
|
|
while (htpos != NULL) { |
482 |
|
|
ep = htpos->def; |
483 |
greg |
1.19 |
nm = htpos->name; |
484 |
greg |
2.4 |
htpos = htpos->next; |
485 |
|
|
if (ep != NULL && incontext(nm)) |
486 |
|
|
return(ep); |
487 |
|
|
} |
488 |
greg |
1.1 |
} |
489 |
|
|
if ((ep = ochpos) != NULL) |
490 |
greg |
2.4 |
ochpos = ep->sibling; |
491 |
greg |
1.1 |
return(ep); |
492 |
|
|
} |
493 |
|
|
|
494 |
|
|
|
495 |
|
|
EPNODE * |
496 |
schorsch |
2.16 |
dpop( /* pop a definition */ |
497 |
|
|
char *name |
498 |
|
|
) |
499 |
greg |
1.1 |
{ |
500 |
|
|
register VARDEF *vp; |
501 |
|
|
register EPNODE *dp; |
502 |
|
|
|
503 |
|
|
if ((vp = varlookup(name)) == NULL || vp->def == NULL) |
504 |
greg |
2.4 |
return(NULL); |
505 |
greg |
1.1 |
dp = vp->def; |
506 |
|
|
vp->def = dp->sibling; |
507 |
|
|
varfree(vp); |
508 |
|
|
return(dp); |
509 |
|
|
} |
510 |
|
|
|
511 |
|
|
|
512 |
greg |
2.12 |
void |
513 |
schorsch |
2.16 |
dpush( /* push on a definition */ |
514 |
|
|
char *nm, |
515 |
|
|
register EPNODE *ep |
516 |
|
|
) |
517 |
greg |
1.1 |
{ |
518 |
|
|
register VARDEF *vp; |
519 |
|
|
|
520 |
greg |
1.13 |
vp = varinsert(nm); |
521 |
greg |
1.1 |
ep->sibling = vp->def; |
522 |
|
|
vp->def = ep; |
523 |
|
|
} |
524 |
|
|
|
525 |
|
|
|
526 |
greg |
2.12 |
void |
527 |
schorsch |
2.16 |
addchan( /* add an output channel assignment */ |
528 |
|
|
EPNODE *sp |
529 |
|
|
) |
530 |
greg |
1.1 |
{ |
531 |
greg |
2.4 |
int ch = sp->v.kid->v.chan; |
532 |
greg |
1.1 |
register EPNODE *ep, *epl; |
533 |
|
|
|
534 |
|
|
for (epl = NULL, ep = outchan; ep != NULL; epl = ep, ep = ep->sibling) |
535 |
|
|
if (ep->v.kid->v.chan >= ch) { |
536 |
|
|
if (epl != NULL) |
537 |
|
|
epl->sibling = sp; |
538 |
|
|
else |
539 |
|
|
outchan = sp; |
540 |
|
|
if (ep->v.kid->v.chan > ch) |
541 |
|
|
sp->sibling = ep; |
542 |
|
|
else { |
543 |
|
|
sp->sibling = ep->sibling; |
544 |
|
|
epfree(ep); |
545 |
|
|
} |
546 |
|
|
return; |
547 |
|
|
} |
548 |
|
|
if (epl != NULL) |
549 |
|
|
epl->sibling = sp; |
550 |
|
|
else |
551 |
|
|
outchan = sp; |
552 |
|
|
sp->sibling = NULL; |
553 |
|
|
|
554 |
|
|
} |
555 |
|
|
|
556 |
|
|
|
557 |
greg |
2.12 |
void |
558 |
schorsch |
2.16 |
getstatement(void) /* get next statement */ |
559 |
greg |
1.1 |
{ |
560 |
|
|
register EPNODE *ep; |
561 |
greg |
1.13 |
char *qname; |
562 |
greg |
1.16 |
register VARDEF *vdef; |
563 |
greg |
1.1 |
|
564 |
|
|
if (nextc == ';') { /* empty statement */ |
565 |
|
|
scan(); |
566 |
|
|
return; |
567 |
|
|
} |
568 |
greg |
2.12 |
if (esupport&E_OUTCHAN && |
569 |
|
|
nextc == '$') { /* channel assignment */ |
570 |
greg |
1.1 |
ep = getchan(); |
571 |
|
|
addchan(ep); |
572 |
greg |
2.12 |
} else { /* ordinary definition */ |
573 |
greg |
1.1 |
ep = getdefn(); |
574 |
greg |
1.13 |
qname = qualname(dname(ep), 0); |
575 |
greg |
2.12 |
if (esupport&E_REDEFW && (vdef = varlookup(qname)) != NULL) |
576 |
greg |
2.7 |
if (vdef->def != NULL && epcmp(ep, vdef->def)) { |
577 |
greg |
1.16 |
wputs(qname); |
578 |
|
|
if (vdef->def->type == ':') |
579 |
|
|
wputs(": redefined constant expression\n"); |
580 |
|
|
else |
581 |
|
|
wputs(": redefined\n"); |
582 |
greg |
2.12 |
} else if (ep->v.kid->type == FUNC && vdef->lib != NULL) { |
583 |
greg |
1.16 |
wputs(qname); |
584 |
|
|
wputs(": definition hides library function\n"); |
585 |
|
|
} |
586 |
greg |
1.10 |
if (ep->type == ':') |
587 |
greg |
1.13 |
dremove(qname); |
588 |
greg |
1.10 |
else |
589 |
greg |
1.13 |
dclear(qname); |
590 |
|
|
dpush(qname, ep); |
591 |
greg |
1.1 |
} |
592 |
|
|
if (nextc != EOF) { |
593 |
|
|
if (nextc != ';') |
594 |
|
|
syntax("';' expected"); |
595 |
|
|
scan(); |
596 |
|
|
} |
597 |
|
|
} |
598 |
|
|
|
599 |
|
|
|
600 |
|
|
EPNODE * |
601 |
schorsch |
2.16 |
getdefn(void) |
602 |
|
|
/* A -> SYM = E1 */ |
603 |
|
|
/* SYM : E1 */ |
604 |
|
|
/* FUNC(SYM,..) = E1 */ |
605 |
|
|
/* FUNC(SYM,..) : E1 */ |
606 |
greg |
1.1 |
{ |
607 |
|
|
register EPNODE *ep1, *ep2; |
608 |
|
|
|
609 |
greg |
1.18 |
if (!isalpha(nextc) && nextc != CNTXMARK) |
610 |
greg |
1.1 |
syntax("illegal variable name"); |
611 |
|
|
|
612 |
|
|
ep1 = newnode(); |
613 |
|
|
ep1->type = SYM; |
614 |
|
|
ep1->v.name = savestr(getname()); |
615 |
|
|
|
616 |
greg |
2.12 |
if (esupport&E_FUNCTION && nextc == '(') { |
617 |
greg |
1.1 |
ep2 = newnode(); |
618 |
|
|
ep2->type = FUNC; |
619 |
|
|
addekid(ep2, ep1); |
620 |
|
|
ep1 = ep2; |
621 |
|
|
do { |
622 |
|
|
scan(); |
623 |
|
|
if (!isalpha(nextc)) |
624 |
|
|
syntax("illegal variable name"); |
625 |
|
|
ep2 = newnode(); |
626 |
|
|
ep2->type = SYM; |
627 |
|
|
ep2->v.name = savestr(getname()); |
628 |
|
|
addekid(ep1, ep2); |
629 |
|
|
} while (nextc == ','); |
630 |
|
|
if (nextc != ')') |
631 |
|
|
syntax("')' expected"); |
632 |
|
|
scan(); |
633 |
|
|
curfunc = ep1; |
634 |
greg |
2.10 |
} |
635 |
greg |
1.1 |
|
636 |
greg |
1.8 |
if (nextc != '=' && nextc != ':') |
637 |
|
|
syntax("'=' or ':' expected"); |
638 |
greg |
1.1 |
|
639 |
|
|
ep2 = newnode(); |
640 |
greg |
1.8 |
ep2->type = nextc; |
641 |
|
|
scan(); |
642 |
greg |
1.1 |
addekid(ep2, ep1); |
643 |
|
|
addekid(ep2, getE1()); |
644 |
|
|
|
645 |
greg |
2.12 |
if (ep1->type == SYM && ep1->sibling->type != NUM) { |
646 |
greg |
1.1 |
ep1 = newnode(); |
647 |
|
|
ep1->type = TICK; |
648 |
greg |
2.8 |
ep1->v.tick = 0; |
649 |
greg |
1.1 |
addekid(ep2, ep1); |
650 |
|
|
ep1 = newnode(); |
651 |
|
|
ep1->type = NUM; |
652 |
|
|
addekid(ep2, ep1); |
653 |
|
|
} |
654 |
greg |
2.10 |
curfunc = NULL; |
655 |
greg |
1.1 |
|
656 |
|
|
return(ep2); |
657 |
|
|
} |
658 |
|
|
|
659 |
|
|
|
660 |
|
|
EPNODE * |
661 |
schorsch |
2.16 |
getchan(void) /* A -> $N = E1 */ |
662 |
greg |
1.1 |
{ |
663 |
|
|
register EPNODE *ep1, *ep2; |
664 |
|
|
|
665 |
|
|
if (nextc != '$') |
666 |
|
|
syntax("missing '$'"); |
667 |
|
|
scan(); |
668 |
|
|
|
669 |
|
|
ep1 = newnode(); |
670 |
|
|
ep1->type = CHAN; |
671 |
|
|
ep1->v.chan = getinum(); |
672 |
|
|
|
673 |
|
|
if (nextc != '=') |
674 |
|
|
syntax("'=' expected"); |
675 |
|
|
scan(); |
676 |
|
|
|
677 |
|
|
ep2 = newnode(); |
678 |
|
|
ep2->type = '='; |
679 |
|
|
addekid(ep2, ep1); |
680 |
|
|
addekid(ep2, getE1()); |
681 |
|
|
|
682 |
|
|
return(ep2); |
683 |
|
|
} |
684 |
|
|
|
685 |
|
|
|
686 |
|
|
|
687 |
|
|
/* |
688 |
|
|
* The following routines are for internal use only: |
689 |
|
|
*/ |
690 |
|
|
|
691 |
|
|
|
692 |
|
|
static double |
693 |
schorsch |
2.16 |
dvalue( /* evaluate a variable */ |
694 |
|
|
char *name, |
695 |
|
|
EPNODE *d |
696 |
|
|
) |
697 |
greg |
1.1 |
{ |
698 |
|
|
register EPNODE *ep1, *ep2; |
699 |
|
|
|
700 |
|
|
if (d == NULL || d->v.kid->type != SYM) { |
701 |
|
|
eputs(name); |
702 |
|
|
eputs(": undefined variable\n"); |
703 |
|
|
quit(1); |
704 |
|
|
} |
705 |
|
|
ep1 = d->v.kid->sibling; /* get expression */ |
706 |
greg |
1.5 |
if (ep1->type == NUM) |
707 |
|
|
return(ep1->v.num); /* return if number */ |
708 |
greg |
1.1 |
ep2 = ep1->sibling; /* check time */ |
709 |
greg |
2.12 |
if (eclock >= MAXCLOCK) |
710 |
|
|
eclock = 1; /* wrap clock counter */ |
711 |
|
|
if (ep2->v.tick < MAXCLOCK && |
712 |
|
|
ep2->v.tick == 0 | ep2->v.tick != eclock) { |
713 |
|
|
ep2->v.tick = d->type == ':' ? MAXCLOCK : eclock; |
714 |
greg |
1.1 |
ep2 = ep2->sibling; |
715 |
greg |
1.5 |
ep2->v.num = evalue(ep1); /* needs new value */ |
716 |
greg |
1.1 |
} else |
717 |
greg |
1.5 |
ep2 = ep2->sibling; /* else reuse old value */ |
718 |
greg |
1.1 |
|
719 |
|
|
return(ep2->v.num); |
720 |
|
|
} |