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greg |
1.9 |
/* Copyright (c) 1991 Regents of the University of California */ |
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greg |
1.1 |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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/* |
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* Store variable definitions. |
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* |
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* 7/1/85 Greg Ward |
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* |
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* 11/11/85 Added conditional compiles (OUTCHAN) for control output. |
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* |
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* 4/2/86 Added conditional compiles for function definitions (FUNCTION). |
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* |
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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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greg |
1.2 |
* |
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* 5/31/90 Added conditional compile (REDEFW) for redefinition warning. |
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greg |
1.8 |
* |
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* 4/23/91 Added ':' defines for constant expressions (RCONST) |
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greg |
1.1 |
*/ |
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#include <stdio.h> |
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#include <ctype.h> |
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#include "calcomp.h" |
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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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#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
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extern char *ecalloc(), *savestr(); |
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greg |
1.3 |
static double dvalue(); |
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greg |
1.1 |
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long eclock = -1; /* value storage timer */ |
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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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#ifdef FUNCTION |
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EPNODE *curfunc; |
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#define dname(ep) ((ep)->v.kid->type == SYM ? \ |
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(ep)->v.kid->v.name : \ |
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(ep)->v.kid->v.kid->v.name) |
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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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fcompile(fname) /* get definitions from a file */ |
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char *fname; |
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{ |
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FILE *fp; |
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if (fname == NULL) |
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fp = stdin; |
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else if ((fp = fopen(fname, "r")) == NULL) { |
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eputs(fname); |
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eputs(": cannot open\n"); |
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quit(1); |
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} |
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greg |
1.4 |
initfile(fp, fname, 0); |
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greg |
1.1 |
while (nextc != EOF) |
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loaddefn(); |
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if (fname != NULL) |
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fclose(fp); |
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} |
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greg |
1.4 |
scompile(str, fn, ln) /* get definitions from a string */ |
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greg |
1.1 |
char *str; |
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greg |
1.4 |
char *fn; |
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int ln; |
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greg |
1.1 |
{ |
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greg |
1.4 |
initstr(str, fn, ln); |
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greg |
1.1 |
while (nextc != EOF) |
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loaddefn(); |
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} |
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double |
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varvalue(vname) /* return a variable's value */ |
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char *vname; |
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{ |
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return(dvalue(vname, dlookup(vname))); |
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} |
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double |
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evariable(ep) /* evaluate a variable */ |
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EPNODE *ep; |
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{ |
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register VARDEF *dp = ep->v.ln; |
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return(dvalue(dp->name, dp->def)); |
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} |
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greg |
1.8 |
varset(vname, assign, val) /* set a variable's value */ |
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greg |
1.1 |
char *vname; |
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greg |
1.8 |
int assign; |
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greg |
1.1 |
double val; |
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{ |
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register EPNODE *ep1, *ep2; |
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/* check for quick set */ |
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if ((ep1 = dlookup(vname)) != NULL && ep1->v.kid->type == SYM) { |
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ep2 = ep1->v.kid->sibling; |
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if (ep2->type == NUM) { |
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ep2->v.num = val; |
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greg |
1.8 |
ep1->type = assign; |
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greg |
1.1 |
return; |
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} |
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} |
125 |
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/* hand build definition */ |
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ep1 = newnode(); |
127 |
greg |
1.8 |
ep1->type = assign; |
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greg |
1.1 |
ep2 = newnode(); |
129 |
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ep2->type = SYM; |
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ep2->v.name = savestr(vname); |
131 |
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addekid(ep1, ep2); |
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ep2 = newnode(); |
133 |
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ep2->type = NUM; |
134 |
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ep2->v.num = val; |
135 |
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addekid(ep1, ep2); |
136 |
greg |
1.8 |
dremove(vname); |
137 |
greg |
1.1 |
dpush(ep1); |
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} |
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140 |
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141 |
greg |
1.8 |
dclear(name) /* delete variable definitions of name */ |
142 |
greg |
1.1 |
char *name; |
143 |
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{ |
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register EPNODE *ep; |
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146 |
greg |
1.8 |
while ((ep = dpop(name)) != NULL) { |
147 |
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if (ep->type == ':') { |
148 |
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dpush(ep); /* don't clear constants */ |
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return; |
150 |
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} |
151 |
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epfree(ep); |
152 |
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} |
153 |
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} |
154 |
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155 |
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156 |
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dremove(name) /* delete all definitions of name */ |
157 |
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char *name; |
158 |
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{ |
159 |
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register EPNODE *ep; |
160 |
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161 |
greg |
1.1 |
while ((ep = dpop(name)) != NULL) |
162 |
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epfree(ep); |
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} |
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165 |
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166 |
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vardefined(name) /* return non-zero if variable defined */ |
167 |
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char *name; |
168 |
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{ |
169 |
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register EPNODE *dp; |
170 |
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171 |
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return((dp = dlookup(name)) != NULL && dp->v.kid->type == SYM); |
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} |
173 |
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174 |
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175 |
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#ifdef OUTCHAN |
176 |
greg |
1.6 |
chanout(cs) /* set output channels */ |
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int (*cs)(); |
178 |
greg |
1.1 |
{ |
179 |
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register EPNODE *ep; |
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for (ep = outchan; ep != NULL; ep = ep->sibling) |
182 |
greg |
1.6 |
(*cs)(ep->v.kid->v.chan, evalue(ep->v.kid->sibling)); |
183 |
greg |
1.1 |
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184 |
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} |
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#endif |
186 |
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187 |
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188 |
greg |
1.9 |
dcleanup(cons, ochans) /* clear definitions */ |
189 |
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int cons, ochans; |
190 |
greg |
1.1 |
{ |
191 |
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register int i; |
192 |
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register VARDEF *vp; |
193 |
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register EPNODE *ep; |
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for (i = 0; i < NHASH; i++) |
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for (vp = hashtbl[i]; vp != NULL; vp = vp->next) |
197 |
greg |
1.9 |
if (cons) |
198 |
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dremove(vp->name); |
199 |
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else |
200 |
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dclear(vp->name); |
201 |
greg |
1.1 |
#ifdef OUTCHAN |
202 |
greg |
1.9 |
if (ochans) { |
203 |
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for (ep = outchan; ep != NULL; ep = ep->sibling) |
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epfree(ep); |
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outchan = NULL; |
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} |
207 |
greg |
1.1 |
#endif |
208 |
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} |
209 |
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210 |
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211 |
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EPNODE * |
212 |
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dlookup(name) /* look up a definition */ |
213 |
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char *name; |
214 |
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{ |
215 |
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register VARDEF *vp; |
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217 |
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if ((vp = varlookup(name)) == NULL) |
218 |
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return(NULL); |
219 |
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return(vp->def); |
220 |
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} |
221 |
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222 |
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223 |
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VARDEF * |
224 |
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varlookup(name) /* look up a variable */ |
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char *name; |
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{ |
227 |
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register VARDEF *vp; |
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for (vp = hashtbl[hash(name)]; vp != NULL; vp = vp->next) |
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if (!strcmp(vp->name, name)) |
231 |
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return(vp); |
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return(NULL); |
233 |
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} |
234 |
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235 |
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236 |
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VARDEF * |
237 |
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varinsert(name) /* get a link to a variable */ |
238 |
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char *name; |
239 |
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{ |
240 |
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register VARDEF *vp; |
241 |
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int hv; |
242 |
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243 |
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hv = hash(name); |
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for (vp = hashtbl[hv]; vp != NULL; vp = vp->next) |
245 |
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if (!strcmp(vp->name, name)) { |
246 |
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vp->nlinks++; |
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return(vp); |
248 |
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} |
249 |
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vp = (VARDEF *)emalloc(sizeof(VARDEF)); |
250 |
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vp->name = savestr(name); |
251 |
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vp->nlinks = 1; |
252 |
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vp->def = NULL; |
253 |
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vp->lib = NULL; |
254 |
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vp->next = hashtbl[hv]; |
255 |
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hashtbl[hv] = vp; |
256 |
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return(vp); |
257 |
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} |
258 |
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259 |
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260 |
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varfree(ln) /* release link to variable */ |
261 |
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register VARDEF *ln; |
262 |
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{ |
263 |
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register VARDEF *vp; |
264 |
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int hv; |
265 |
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266 |
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if (--ln->nlinks > 0) |
267 |
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return; /* still active */ |
268 |
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269 |
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hv = hash(ln->name); |
270 |
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vp = hashtbl[hv]; |
271 |
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if (vp == ln) |
272 |
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hashtbl[hv] = vp->next; |
273 |
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else { |
274 |
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while (vp->next != ln) /* must be in list */ |
275 |
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vp = vp->next; |
276 |
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vp->next = ln->next; |
277 |
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} |
278 |
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freestr(ln->name); |
279 |
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efree((char *)ln); |
280 |
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} |
281 |
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282 |
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283 |
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EPNODE * |
284 |
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dfirst() /* return pointer to first definition */ |
285 |
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{ |
286 |
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htndx = 0; |
287 |
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htpos = NULL; |
288 |
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#ifdef OUTCHAN |
289 |
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ochpos = outchan; |
290 |
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#endif |
291 |
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return(dnext()); |
292 |
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} |
293 |
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294 |
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295 |
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EPNODE * |
296 |
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dnext() /* return pointer to next definition */ |
297 |
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{ |
298 |
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register EPNODE *ep; |
299 |
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300 |
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while (htndx < NHASH) { |
301 |
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if (htpos == NULL) |
302 |
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htpos = hashtbl[htndx++]; |
303 |
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while (htpos != NULL) { |
304 |
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ep = htpos->def; |
305 |
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htpos = htpos->next; |
306 |
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if (ep != NULL) |
307 |
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return(ep); |
308 |
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} |
309 |
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} |
310 |
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#ifdef OUTCHAN |
311 |
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if ((ep = ochpos) != NULL) |
312 |
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ochpos = ep->sibling; |
313 |
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return(ep); |
314 |
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#else |
315 |
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return(NULL); |
316 |
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#endif |
317 |
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} |
318 |
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319 |
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320 |
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EPNODE * |
321 |
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dpop(name) /* pop a definition */ |
322 |
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char *name; |
323 |
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{ |
324 |
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register VARDEF *vp; |
325 |
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register EPNODE *dp; |
326 |
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327 |
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if ((vp = varlookup(name)) == NULL || vp->def == NULL) |
328 |
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return(NULL); |
329 |
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dp = vp->def; |
330 |
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vp->def = dp->sibling; |
331 |
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varfree(vp); |
332 |
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return(dp); |
333 |
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} |
334 |
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335 |
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336 |
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dpush(ep) /* push on a definition */ |
337 |
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register EPNODE *ep; |
338 |
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{ |
339 |
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register VARDEF *vp; |
340 |
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341 |
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vp = varinsert(dname(ep)); |
342 |
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ep->sibling = vp->def; |
343 |
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vp->def = ep; |
344 |
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} |
345 |
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346 |
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347 |
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#ifdef OUTCHAN |
348 |
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addchan(sp) /* add an output channel assignment */ |
349 |
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EPNODE *sp; |
350 |
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{ |
351 |
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int ch = sp->v.kid->v.chan; |
352 |
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register EPNODE *ep, *epl; |
353 |
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354 |
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for (epl = NULL, ep = outchan; ep != NULL; epl = ep, ep = ep->sibling) |
355 |
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if (ep->v.kid->v.chan >= ch) { |
356 |
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if (epl != NULL) |
357 |
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epl->sibling = sp; |
358 |
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else |
359 |
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outchan = sp; |
360 |
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if (ep->v.kid->v.chan > ch) |
361 |
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sp->sibling = ep; |
362 |
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else { |
363 |
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sp->sibling = ep->sibling; |
364 |
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epfree(ep); |
365 |
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} |
366 |
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return; |
367 |
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} |
368 |
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if (epl != NULL) |
369 |
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epl->sibling = sp; |
370 |
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else |
371 |
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outchan = sp; |
372 |
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sp->sibling = NULL; |
373 |
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374 |
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} |
375 |
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#endif |
376 |
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377 |
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378 |
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loaddefn() /* load next definition */ |
379 |
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{ |
380 |
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register EPNODE *ep; |
381 |
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382 |
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if (nextc == ';') { /* empty statement */ |
383 |
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scan(); |
384 |
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return; |
385 |
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} |
386 |
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#ifdef OUTCHAN |
387 |
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if (nextc == '$') { /* channel assignment */ |
388 |
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ep = getchan(); |
389 |
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addchan(ep); |
390 |
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} else |
391 |
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#endif |
392 |
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{ /* ordinary definition */ |
393 |
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ep = getdefn(); |
394 |
greg |
1.2 |
#ifdef REDEFW |
395 |
|
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if (dlookup(dname(ep)) != NULL) { |
396 |
greg |
1.8 |
dclear(dname(ep)); |
397 |
|
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wputs(dname(ep)); |
398 |
|
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if (dlookup(dname(ep)) == NULL) |
399 |
greg |
1.2 |
wputs(": redefined\n"); |
400 |
greg |
1.8 |
else |
401 |
|
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wputs(": redefined constant expression\n"); |
402 |
greg |
1.2 |
} |
403 |
greg |
1.8 |
#ifdef FUNCTION |
404 |
|
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else if (ep->v.kid->type == FUNC && |
405 |
|
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liblookup(ep->v.kid->v.kid->v.name) != NULL) { |
406 |
|
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wputs(ep->v.kid->v.kid->v.name); |
407 |
|
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wputs(": redefined library function\n"); |
408 |
|
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} |
409 |
|
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#endif |
410 |
greg |
1.2 |
#else |
411 |
greg |
1.1 |
dclear(dname(ep)); |
412 |
greg |
1.2 |
#endif |
413 |
greg |
1.1 |
dpush(ep); |
414 |
|
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} |
415 |
|
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if (nextc != EOF) { |
416 |
|
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if (nextc != ';') |
417 |
|
|
syntax("';' expected"); |
418 |
|
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scan(); |
419 |
|
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} |
420 |
|
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} |
421 |
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422 |
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423 |
|
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EPNODE * |
424 |
|
|
getdefn() /* A -> SYM = E1 */ |
425 |
greg |
1.8 |
/* SYM : E1 */ |
426 |
greg |
1.1 |
/* FUNC(SYM,..) = E1 */ |
427 |
greg |
1.8 |
/* FUNC(SYM,..) : E1 */ |
428 |
greg |
1.1 |
{ |
429 |
|
|
register EPNODE *ep1, *ep2; |
430 |
|
|
|
431 |
|
|
if (!isalpha(nextc)) |
432 |
|
|
syntax("illegal variable name"); |
433 |
|
|
|
434 |
|
|
ep1 = newnode(); |
435 |
|
|
ep1->type = SYM; |
436 |
|
|
ep1->v.name = savestr(getname()); |
437 |
|
|
|
438 |
|
|
#ifdef FUNCTION |
439 |
|
|
if (nextc == '(') { |
440 |
|
|
ep2 = newnode(); |
441 |
|
|
ep2->type = FUNC; |
442 |
|
|
addekid(ep2, ep1); |
443 |
|
|
ep1 = ep2; |
444 |
|
|
do { |
445 |
|
|
scan(); |
446 |
|
|
if (!isalpha(nextc)) |
447 |
|
|
syntax("illegal variable name"); |
448 |
|
|
ep2 = newnode(); |
449 |
|
|
ep2->type = SYM; |
450 |
|
|
ep2->v.name = savestr(getname()); |
451 |
|
|
addekid(ep1, ep2); |
452 |
|
|
} while (nextc == ','); |
453 |
|
|
if (nextc != ')') |
454 |
|
|
syntax("')' expected"); |
455 |
|
|
scan(); |
456 |
|
|
curfunc = ep1; |
457 |
|
|
} else |
458 |
|
|
curfunc = NULL; |
459 |
|
|
#endif |
460 |
|
|
|
461 |
greg |
1.8 |
if (nextc != '=' && nextc != ':') |
462 |
|
|
syntax("'=' or ':' expected"); |
463 |
greg |
1.1 |
|
464 |
|
|
ep2 = newnode(); |
465 |
greg |
1.8 |
ep2->type = nextc; |
466 |
|
|
scan(); |
467 |
greg |
1.1 |
addekid(ep2, ep1); |
468 |
greg |
1.8 |
#ifdef RCONST |
469 |
|
|
if ( |
470 |
|
|
#ifdef FUNCTION |
471 |
|
|
ep1->type == SYM && |
472 |
|
|
#endif |
473 |
|
|
ep2->type == ':') |
474 |
|
|
addekid(ep2, rconst(getE1())); |
475 |
|
|
else |
476 |
|
|
#endif |
477 |
greg |
1.1 |
addekid(ep2, getE1()); |
478 |
|
|
|
479 |
greg |
1.7 |
if ( |
480 |
greg |
1.1 |
#ifdef FUNCTION |
481 |
greg |
1.7 |
ep1->type == SYM && |
482 |
greg |
1.1 |
#endif |
483 |
greg |
1.7 |
ep1->sibling->type != NUM) { |
484 |
greg |
1.1 |
ep1 = newnode(); |
485 |
|
|
ep1->type = TICK; |
486 |
|
|
ep1->v.tick = -1; |
487 |
|
|
addekid(ep2, ep1); |
488 |
|
|
ep1 = newnode(); |
489 |
|
|
ep1->type = NUM; |
490 |
|
|
addekid(ep2, ep1); |
491 |
|
|
} |
492 |
|
|
|
493 |
|
|
return(ep2); |
494 |
|
|
} |
495 |
|
|
|
496 |
|
|
|
497 |
|
|
#ifdef OUTCHAN |
498 |
|
|
EPNODE * |
499 |
|
|
getchan() /* A -> $N = E1 */ |
500 |
|
|
{ |
501 |
|
|
register EPNODE *ep1, *ep2; |
502 |
|
|
|
503 |
|
|
if (nextc != '$') |
504 |
|
|
syntax("missing '$'"); |
505 |
|
|
scan(); |
506 |
|
|
|
507 |
|
|
ep1 = newnode(); |
508 |
|
|
ep1->type = CHAN; |
509 |
|
|
ep1->v.chan = getinum(); |
510 |
|
|
|
511 |
|
|
if (nextc != '=') |
512 |
|
|
syntax("'=' expected"); |
513 |
|
|
scan(); |
514 |
|
|
|
515 |
|
|
ep2 = newnode(); |
516 |
|
|
ep2->type = '='; |
517 |
|
|
addekid(ep2, ep1); |
518 |
|
|
addekid(ep2, getE1()); |
519 |
|
|
|
520 |
|
|
return(ep2); |
521 |
|
|
} |
522 |
|
|
#endif |
523 |
|
|
|
524 |
|
|
|
525 |
|
|
|
526 |
|
|
/* |
527 |
|
|
* The following routines are for internal use only: |
528 |
|
|
*/ |
529 |
|
|
|
530 |
|
|
|
531 |
|
|
static double |
532 |
|
|
dvalue(name, d) /* evaluate a variable */ |
533 |
|
|
char *name; |
534 |
|
|
EPNODE *d; |
535 |
|
|
{ |
536 |
|
|
register EPNODE *ep1, *ep2; |
537 |
|
|
|
538 |
|
|
if (d == NULL || d->v.kid->type != SYM) { |
539 |
|
|
eputs(name); |
540 |
|
|
eputs(": undefined variable\n"); |
541 |
|
|
quit(1); |
542 |
|
|
} |
543 |
|
|
ep1 = d->v.kid->sibling; /* get expression */ |
544 |
greg |
1.5 |
if (ep1->type == NUM) |
545 |
|
|
return(ep1->v.num); /* return if number */ |
546 |
greg |
1.1 |
ep2 = ep1->sibling; /* check time */ |
547 |
|
|
if (ep2->v.tick < 0 || ep2->v.tick < eclock) { |
548 |
greg |
1.8 |
ep2->v.tick = d->type == ':' ? 1L<<30 : eclock; |
549 |
greg |
1.1 |
ep2 = ep2->sibling; |
550 |
greg |
1.5 |
ep2->v.num = evalue(ep1); /* needs new value */ |
551 |
greg |
1.1 |
} else |
552 |
greg |
1.5 |
ep2 = ep2->sibling; /* else reuse old value */ |
553 |
greg |
1.1 |
|
554 |
|
|
return(ep2->v.num); |
555 |
|
|
} |
556 |
|
|
|
557 |
|
|
|
558 |
|
|
static int |
559 |
|
|
hash(s) /* hash a string */ |
560 |
|
|
register char *s; |
561 |
|
|
{ |
562 |
|
|
register int rval = 0; |
563 |
|
|
|
564 |
|
|
while (*s) |
565 |
|
|
rval += *s++; |
566 |
|
|
|
567 |
|
|
return(rval % NHASH); |
568 |
|
|
} |