1 |
greg |
1.9 |
/* Copyright (c) 1991 Regents of the University of California */ |
2 |
greg |
1.1 |
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3 |
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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. |
21 |
greg |
1.8 |
* |
22 |
greg |
1.10 |
* 4/23/91 Added ':' assignment for constant expressions |
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greg |
1.13 |
* |
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* 8/7/91 Added optional context path to append to variable names |
25 |
greg |
1.1 |
*/ |
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#include <stdio.h> |
28 |
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29 |
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#include <ctype.h> |
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31 |
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#include "calcomp.h" |
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33 |
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#ifndef NHASH |
34 |
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#define NHASH 521 /* hash size (a prime!) */ |
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#endif |
36 |
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37 |
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#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
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39 |
greg |
1.13 |
extern char *ecalloc(), *savestr(), *strcpy(); |
40 |
greg |
1.1 |
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41 |
greg |
1.3 |
static double dvalue(); |
42 |
greg |
1.1 |
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43 |
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long eclock = -1; /* value storage timer */ |
44 |
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45 |
greg |
1.13 |
static char context[MAXWORD]; /* current context path */ |
46 |
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47 |
greg |
1.1 |
static VARDEF *hashtbl[NHASH]; /* definition list */ |
48 |
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static int htndx; /* index for */ |
49 |
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static VARDEF *htpos; /* ...dfirst() and */ |
50 |
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#ifdef OUTCHAN |
51 |
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static EPNODE *ochpos; /* ...dnext */ |
52 |
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static EPNODE *outchan; |
53 |
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#endif |
54 |
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55 |
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#ifdef FUNCTION |
56 |
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EPNODE *curfunc; |
57 |
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#define dname(ep) ((ep)->v.kid->type == SYM ? \ |
58 |
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(ep)->v.kid->v.name : \ |
59 |
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(ep)->v.kid->v.kid->v.name) |
60 |
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#else |
61 |
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#define dname(ep) ((ep)->v.kid->v.name) |
62 |
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#endif |
63 |
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64 |
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65 |
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fcompile(fname) /* get definitions from a file */ |
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char *fname; |
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{ |
68 |
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FILE *fp; |
69 |
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70 |
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if (fname == NULL) |
71 |
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fp = stdin; |
72 |
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else if ((fp = fopen(fname, "r")) == NULL) { |
73 |
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eputs(fname); |
74 |
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eputs(": cannot open\n"); |
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quit(1); |
76 |
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} |
77 |
greg |
1.4 |
initfile(fp, fname, 0); |
78 |
greg |
1.1 |
while (nextc != EOF) |
79 |
greg |
1.13 |
getstatement(); |
80 |
greg |
1.1 |
if (fname != NULL) |
81 |
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fclose(fp); |
82 |
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} |
83 |
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84 |
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85 |
greg |
1.4 |
scompile(str, fn, ln) /* get definitions from a string */ |
86 |
greg |
1.1 |
char *str; |
87 |
greg |
1.4 |
char *fn; |
88 |
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int ln; |
89 |
greg |
1.1 |
{ |
90 |
greg |
1.4 |
initstr(str, fn, ln); |
91 |
greg |
1.1 |
while (nextc != EOF) |
92 |
greg |
1.13 |
getstatement(); |
93 |
greg |
1.1 |
} |
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95 |
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96 |
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double |
97 |
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varvalue(vname) /* return a variable's value */ |
98 |
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char *vname; |
99 |
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{ |
100 |
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return(dvalue(vname, dlookup(vname))); |
101 |
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} |
102 |
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103 |
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104 |
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double |
105 |
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evariable(ep) /* evaluate a variable */ |
106 |
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EPNODE *ep; |
107 |
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{ |
108 |
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register VARDEF *dp = ep->v.ln; |
109 |
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110 |
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return(dvalue(dp->name, dp->def)); |
111 |
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} |
112 |
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113 |
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114 |
greg |
1.8 |
varset(vname, assign, val) /* set a variable's value */ |
115 |
greg |
1.1 |
char *vname; |
116 |
greg |
1.8 |
int assign; |
117 |
greg |
1.1 |
double val; |
118 |
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{ |
119 |
greg |
1.13 |
char *qname; |
120 |
greg |
1.1 |
register EPNODE *ep1, *ep2; |
121 |
greg |
1.13 |
/* get qualified name */ |
122 |
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qname = qualname(vname, 0); |
123 |
greg |
1.1 |
/* check for quick set */ |
124 |
greg |
1.13 |
if ((ep1 = dlookup(qname)) != NULL && ep1->v.kid->type == SYM) { |
125 |
greg |
1.1 |
ep2 = ep1->v.kid->sibling; |
126 |
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if (ep2->type == NUM) { |
127 |
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ep2->v.num = val; |
128 |
greg |
1.8 |
ep1->type = assign; |
129 |
greg |
1.1 |
return; |
130 |
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} |
131 |
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} |
132 |
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/* hand build definition */ |
133 |
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ep1 = newnode(); |
134 |
greg |
1.8 |
ep1->type = assign; |
135 |
greg |
1.1 |
ep2 = newnode(); |
136 |
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ep2->type = SYM; |
137 |
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ep2->v.name = savestr(vname); |
138 |
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addekid(ep1, ep2); |
139 |
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ep2 = newnode(); |
140 |
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ep2->type = NUM; |
141 |
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ep2->v.num = val; |
142 |
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addekid(ep1, ep2); |
143 |
greg |
1.13 |
dremove(qname); |
144 |
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dpush(qname, ep1); |
145 |
greg |
1.1 |
} |
146 |
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147 |
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148 |
greg |
1.8 |
dclear(name) /* delete variable definitions of name */ |
149 |
greg |
1.1 |
char *name; |
150 |
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{ |
151 |
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register EPNODE *ep; |
152 |
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153 |
greg |
1.8 |
while ((ep = dpop(name)) != NULL) { |
154 |
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if (ep->type == ':') { |
155 |
greg |
1.13 |
dpush(name, ep); /* don't clear constants */ |
156 |
greg |
1.8 |
return; |
157 |
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} |
158 |
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epfree(ep); |
159 |
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} |
160 |
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} |
161 |
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162 |
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163 |
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dremove(name) /* delete all definitions of name */ |
164 |
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char *name; |
165 |
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{ |
166 |
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register EPNODE *ep; |
167 |
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168 |
greg |
1.1 |
while ((ep = dpop(name)) != NULL) |
169 |
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epfree(ep); |
170 |
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} |
171 |
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172 |
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173 |
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vardefined(name) /* return non-zero if variable defined */ |
174 |
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char *name; |
175 |
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{ |
176 |
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register EPNODE *dp; |
177 |
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178 |
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return((dp = dlookup(name)) != NULL && dp->v.kid->type == SYM); |
179 |
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} |
180 |
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181 |
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182 |
greg |
1.13 |
char * |
183 |
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setcontext(ctx) /* set a new context path */ |
184 |
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register char *ctx; |
185 |
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{ |
186 |
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register char *cpp; |
187 |
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188 |
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if (ctx == NULL) |
189 |
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return(context); /* just asking */ |
190 |
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if (!*ctx) { |
191 |
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context[0] = '\0'; /* clear context */ |
192 |
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return(context); |
193 |
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} |
194 |
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cpp = context; /* else copy it (carefully!) */ |
195 |
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if (*ctx != CNTXMARK) |
196 |
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*cpp++ = CNTXMARK; /* make sure there's a mark */ |
197 |
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do { |
198 |
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if (cpp >= context+MAXWORD-1) { |
199 |
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*cpp = '\0'; |
200 |
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wputs(context); |
201 |
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wputs(": context path too long\n"); |
202 |
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return(NULL); |
203 |
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} |
204 |
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if (isid(*ctx)) |
205 |
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*cpp++ = *ctx++; |
206 |
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else { |
207 |
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*cpp++ = '_'; ctx++; |
208 |
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} |
209 |
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} while (*ctx); |
210 |
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*cpp = '\0'; |
211 |
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return(context); |
212 |
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} |
213 |
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214 |
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215 |
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char * |
216 |
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qualname(nam, lvl) /* get qualified name */ |
217 |
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register char *nam; |
218 |
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int lvl; |
219 |
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{ |
220 |
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static char nambuf[MAXWORD]; |
221 |
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register char *cp = nambuf, *cpp = context; |
222 |
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/* check for repeat call */ |
223 |
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if (nam == nambuf) |
224 |
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return(lvl > 0 ? NULL : nambuf); |
225 |
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/* copy name to static buffer */ |
226 |
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while (*nam) { |
227 |
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if (cp >= nambuf+MAXWORD-1) |
228 |
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goto toolong; |
229 |
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if ((*cp++ = *nam++) == CNTXMARK) |
230 |
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cpp = NULL; /* flag a qualified name */ |
231 |
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} |
232 |
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if (cpp == NULL) { |
233 |
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if (lvl > 0) |
234 |
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return(NULL); /* no higher level */ |
235 |
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if (cp[-1] == CNTXMARK) { |
236 |
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cp--; cpp = context; /* current context explicitly */ |
237 |
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} else |
238 |
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cpp = ""; /* else fully qualified */ |
239 |
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} else /* else skip the requested levels */ |
240 |
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while (lvl-- > 0) { |
241 |
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if (!*cpp) |
242 |
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return(NULL); /* return NULL if past global level */ |
243 |
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while (*++cpp && *cpp != CNTXMARK) |
244 |
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; |
245 |
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} |
246 |
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while (*cpp) { /* copy context to static buffer */ |
247 |
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if (cp >= nambuf+MAXWORD-1) |
248 |
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goto toolong; |
249 |
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*cp++ = *cpp++; |
250 |
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} |
251 |
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*cp = '\0'; |
252 |
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return(nambuf); /* return qualified name */ |
253 |
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toolong: |
254 |
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*cp = '\0'; |
255 |
greg |
1.14 |
eputs(nambuf); |
256 |
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eputs(": name too long\n"); |
257 |
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quit(1); |
258 |
greg |
1.13 |
} |
259 |
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260 |
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261 |
greg |
1.14 |
incontext(qn) /* is qualified name in current context? */ |
262 |
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register char *qn; |
263 |
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{ |
264 |
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while (*qn && *qn != CNTXMARK) /* find context mark */ |
265 |
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; |
266 |
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return(!strcmp(qn, context)); |
267 |
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} |
268 |
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269 |
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270 |
greg |
1.1 |
#ifdef OUTCHAN |
271 |
greg |
1.6 |
chanout(cs) /* set output channels */ |
272 |
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int (*cs)(); |
273 |
greg |
1.1 |
{ |
274 |
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register EPNODE *ep; |
275 |
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276 |
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for (ep = outchan; ep != NULL; ep = ep->sibling) |
277 |
greg |
1.6 |
(*cs)(ep->v.kid->v.chan, evalue(ep->v.kid->sibling)); |
278 |
greg |
1.1 |
|
279 |
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} |
280 |
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#endif |
281 |
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282 |
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283 |
greg |
1.12 |
dcleanup(lvl) /* clear definitions (0->vars,1->output,2->consts) */ |
284 |
greg |
1.10 |
int lvl; |
285 |
greg |
1.1 |
{ |
286 |
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register int i; |
287 |
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register VARDEF *vp; |
288 |
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register EPNODE *ep; |
289 |
greg |
1.14 |
/* if context is global, clear all */ |
290 |
greg |
1.1 |
for (i = 0; i < NHASH; i++) |
291 |
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for (vp = hashtbl[i]; vp != NULL; vp = vp->next) |
292 |
greg |
1.14 |
if (!context[0] || incontext(vp->name)) |
293 |
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if (lvl >= 2) |
294 |
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dremove(vp->name); |
295 |
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else |
296 |
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dclear(vp->name); |
297 |
greg |
1.1 |
#ifdef OUTCHAN |
298 |
greg |
1.12 |
if (lvl >= 1) { |
299 |
greg |
1.9 |
for (ep = outchan; ep != NULL; ep = ep->sibling) |
300 |
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epfree(ep); |
301 |
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outchan = NULL; |
302 |
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} |
303 |
greg |
1.1 |
#endif |
304 |
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} |
305 |
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306 |
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307 |
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EPNODE * |
308 |
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dlookup(name) /* look up a definition */ |
309 |
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char *name; |
310 |
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{ |
311 |
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register VARDEF *vp; |
312 |
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313 |
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if ((vp = varlookup(name)) == NULL) |
314 |
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return(NULL); |
315 |
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return(vp->def); |
316 |
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} |
317 |
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318 |
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319 |
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VARDEF * |
320 |
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varlookup(name) /* look up a variable */ |
321 |
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char *name; |
322 |
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{ |
323 |
greg |
1.13 |
int lvl = 0; |
324 |
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register char *qname; |
325 |
greg |
1.1 |
register VARDEF *vp; |
326 |
greg |
1.13 |
/* find most qualified match */ |
327 |
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while ((qname = qualname(name, lvl++)) != NULL) |
328 |
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for (vp = hashtbl[hash(qname)]; vp != NULL; vp = vp->next) |
329 |
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if (!strcmp(vp->name, qname)) |
330 |
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return(vp); |
331 |
greg |
1.1 |
return(NULL); |
332 |
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} |
333 |
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334 |
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|
335 |
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VARDEF * |
336 |
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varinsert(name) /* get a link to a variable */ |
337 |
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char *name; |
338 |
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{ |
339 |
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register VARDEF *vp; |
340 |
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int hv; |
341 |
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342 |
greg |
1.13 |
if ((vp = varlookup(name)) != NULL) { |
343 |
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vp->nlinks++; |
344 |
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return(vp); |
345 |
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} |
346 |
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name = qualname(name, 0); /* use fully qualified name */ |
347 |
greg |
1.1 |
hv = hash(name); |
348 |
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vp = (VARDEF *)emalloc(sizeof(VARDEF)); |
349 |
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vp->name = savestr(name); |
350 |
|
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vp->nlinks = 1; |
351 |
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vp->def = NULL; |
352 |
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vp->lib = NULL; |
353 |
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vp->next = hashtbl[hv]; |
354 |
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hashtbl[hv] = vp; |
355 |
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return(vp); |
356 |
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} |
357 |
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358 |
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359 |
|
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varfree(ln) /* release link to variable */ |
360 |
|
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register VARDEF *ln; |
361 |
|
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{ |
362 |
|
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register VARDEF *vp; |
363 |
|
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int hv; |
364 |
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365 |
|
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if (--ln->nlinks > 0) |
366 |
|
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return; /* still active */ |
367 |
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368 |
|
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hv = hash(ln->name); |
369 |
|
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vp = hashtbl[hv]; |
370 |
|
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if (vp == ln) |
371 |
|
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hashtbl[hv] = vp->next; |
372 |
|
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else { |
373 |
|
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while (vp->next != ln) /* must be in list */ |
374 |
|
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vp = vp->next; |
375 |
|
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vp->next = ln->next; |
376 |
|
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} |
377 |
|
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freestr(ln->name); |
378 |
|
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efree((char *)ln); |
379 |
|
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} |
380 |
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381 |
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|
382 |
|
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EPNODE * |
383 |
|
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dfirst() /* return pointer to first definition */ |
384 |
|
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{ |
385 |
|
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htndx = 0; |
386 |
|
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htpos = NULL; |
387 |
|
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#ifdef OUTCHAN |
388 |
|
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ochpos = outchan; |
389 |
|
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#endif |
390 |
|
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return(dnext()); |
391 |
|
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} |
392 |
|
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|
393 |
|
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|
394 |
|
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EPNODE * |
395 |
|
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dnext() /* return pointer to next definition */ |
396 |
|
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{ |
397 |
|
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register EPNODE *ep; |
398 |
|
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|
399 |
|
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while (htndx < NHASH) { |
400 |
|
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if (htpos == NULL) |
401 |
|
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htpos = hashtbl[htndx++]; |
402 |
|
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while (htpos != NULL) { |
403 |
|
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ep = htpos->def; |
404 |
|
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htpos = htpos->next; |
405 |
|
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if (ep != NULL) |
406 |
|
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return(ep); |
407 |
|
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} |
408 |
|
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} |
409 |
|
|
#ifdef OUTCHAN |
410 |
|
|
if ((ep = ochpos) != NULL) |
411 |
|
|
ochpos = ep->sibling; |
412 |
|
|
return(ep); |
413 |
|
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#else |
414 |
|
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return(NULL); |
415 |
|
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#endif |
416 |
|
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} |
417 |
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418 |
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|
419 |
|
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EPNODE * |
420 |
|
|
dpop(name) /* pop a definition */ |
421 |
|
|
char *name; |
422 |
|
|
{ |
423 |
|
|
register VARDEF *vp; |
424 |
|
|
register EPNODE *dp; |
425 |
|
|
|
426 |
|
|
if ((vp = varlookup(name)) == NULL || vp->def == NULL) |
427 |
|
|
return(NULL); |
428 |
|
|
dp = vp->def; |
429 |
|
|
vp->def = dp->sibling; |
430 |
|
|
varfree(vp); |
431 |
|
|
return(dp); |
432 |
|
|
} |
433 |
|
|
|
434 |
|
|
|
435 |
greg |
1.13 |
dpush(nm, ep) /* push on a definition */ |
436 |
|
|
char *nm; |
437 |
greg |
1.1 |
register EPNODE *ep; |
438 |
|
|
{ |
439 |
|
|
register VARDEF *vp; |
440 |
|
|
|
441 |
greg |
1.13 |
vp = varinsert(nm); |
442 |
greg |
1.1 |
ep->sibling = vp->def; |
443 |
|
|
vp->def = ep; |
444 |
|
|
} |
445 |
|
|
|
446 |
|
|
|
447 |
|
|
#ifdef OUTCHAN |
448 |
|
|
addchan(sp) /* add an output channel assignment */ |
449 |
|
|
EPNODE *sp; |
450 |
|
|
{ |
451 |
|
|
int ch = sp->v.kid->v.chan; |
452 |
|
|
register EPNODE *ep, *epl; |
453 |
|
|
|
454 |
|
|
for (epl = NULL, ep = outchan; ep != NULL; epl = ep, ep = ep->sibling) |
455 |
|
|
if (ep->v.kid->v.chan >= ch) { |
456 |
|
|
if (epl != NULL) |
457 |
|
|
epl->sibling = sp; |
458 |
|
|
else |
459 |
|
|
outchan = sp; |
460 |
|
|
if (ep->v.kid->v.chan > ch) |
461 |
|
|
sp->sibling = ep; |
462 |
|
|
else { |
463 |
|
|
sp->sibling = ep->sibling; |
464 |
|
|
epfree(ep); |
465 |
|
|
} |
466 |
|
|
return; |
467 |
|
|
} |
468 |
|
|
if (epl != NULL) |
469 |
|
|
epl->sibling = sp; |
470 |
|
|
else |
471 |
|
|
outchan = sp; |
472 |
|
|
sp->sibling = NULL; |
473 |
|
|
|
474 |
|
|
} |
475 |
|
|
#endif |
476 |
|
|
|
477 |
|
|
|
478 |
greg |
1.13 |
getstatement() /* get next statement */ |
479 |
greg |
1.1 |
{ |
480 |
|
|
register EPNODE *ep; |
481 |
greg |
1.13 |
char *qname; |
482 |
greg |
1.10 |
EPNODE *lastdef; |
483 |
greg |
1.1 |
|
484 |
|
|
if (nextc == ';') { /* empty statement */ |
485 |
|
|
scan(); |
486 |
|
|
return; |
487 |
|
|
} |
488 |
|
|
#ifdef OUTCHAN |
489 |
|
|
if (nextc == '$') { /* channel assignment */ |
490 |
|
|
ep = getchan(); |
491 |
|
|
addchan(ep); |
492 |
|
|
} else |
493 |
|
|
#endif |
494 |
|
|
{ /* ordinary definition */ |
495 |
|
|
ep = getdefn(); |
496 |
greg |
1.13 |
qname = qualname(dname(ep), 0); |
497 |
greg |
1.2 |
#ifdef REDEFW |
498 |
greg |
1.13 |
if ((lastdef = dlookup(qname)) != NULL) { |
499 |
|
|
wputs(qname); |
500 |
greg |
1.10 |
if (lastdef->type == ':') |
501 |
|
|
wputs(": redefined constant expression\n"); |
502 |
|
|
else |
503 |
greg |
1.2 |
wputs(": redefined\n"); |
504 |
|
|
} |
505 |
greg |
1.8 |
#ifdef FUNCTION |
506 |
greg |
1.13 |
else if (ep->v.kid->type == FUNC && liblookup(qname) != NULL) { |
507 |
|
|
wputs(qname); |
508 |
greg |
1.11 |
wputs(": definition hides library function\n"); |
509 |
greg |
1.8 |
} |
510 |
|
|
#endif |
511 |
greg |
1.2 |
#endif |
512 |
greg |
1.10 |
if (ep->type == ':') |
513 |
greg |
1.13 |
dremove(qname); |
514 |
greg |
1.10 |
else |
515 |
greg |
1.13 |
dclear(qname); |
516 |
|
|
dpush(qname, ep); |
517 |
greg |
1.1 |
} |
518 |
|
|
if (nextc != EOF) { |
519 |
|
|
if (nextc != ';') |
520 |
|
|
syntax("';' expected"); |
521 |
|
|
scan(); |
522 |
|
|
} |
523 |
|
|
} |
524 |
|
|
|
525 |
|
|
|
526 |
|
|
EPNODE * |
527 |
|
|
getdefn() /* A -> SYM = E1 */ |
528 |
greg |
1.8 |
/* SYM : E1 */ |
529 |
greg |
1.1 |
/* FUNC(SYM,..) = E1 */ |
530 |
greg |
1.8 |
/* FUNC(SYM,..) : E1 */ |
531 |
greg |
1.1 |
{ |
532 |
|
|
register EPNODE *ep1, *ep2; |
533 |
|
|
|
534 |
|
|
if (!isalpha(nextc)) |
535 |
|
|
syntax("illegal variable name"); |
536 |
|
|
|
537 |
|
|
ep1 = newnode(); |
538 |
|
|
ep1->type = SYM; |
539 |
|
|
ep1->v.name = savestr(getname()); |
540 |
|
|
|
541 |
|
|
#ifdef FUNCTION |
542 |
|
|
if (nextc == '(') { |
543 |
|
|
ep2 = newnode(); |
544 |
|
|
ep2->type = FUNC; |
545 |
|
|
addekid(ep2, ep1); |
546 |
|
|
ep1 = ep2; |
547 |
|
|
do { |
548 |
|
|
scan(); |
549 |
|
|
if (!isalpha(nextc)) |
550 |
|
|
syntax("illegal variable name"); |
551 |
|
|
ep2 = newnode(); |
552 |
|
|
ep2->type = SYM; |
553 |
|
|
ep2->v.name = savestr(getname()); |
554 |
|
|
addekid(ep1, ep2); |
555 |
|
|
} while (nextc == ','); |
556 |
|
|
if (nextc != ')') |
557 |
|
|
syntax("')' expected"); |
558 |
|
|
scan(); |
559 |
|
|
curfunc = ep1; |
560 |
|
|
} else |
561 |
|
|
curfunc = NULL; |
562 |
|
|
#endif |
563 |
|
|
|
564 |
greg |
1.8 |
if (nextc != '=' && nextc != ':') |
565 |
|
|
syntax("'=' or ':' expected"); |
566 |
greg |
1.1 |
|
567 |
|
|
ep2 = newnode(); |
568 |
greg |
1.8 |
ep2->type = nextc; |
569 |
|
|
scan(); |
570 |
greg |
1.1 |
addekid(ep2, ep1); |
571 |
|
|
addekid(ep2, getE1()); |
572 |
|
|
|
573 |
greg |
1.7 |
if ( |
574 |
greg |
1.1 |
#ifdef FUNCTION |
575 |
greg |
1.7 |
ep1->type == SYM && |
576 |
greg |
1.1 |
#endif |
577 |
greg |
1.7 |
ep1->sibling->type != NUM) { |
578 |
greg |
1.1 |
ep1 = newnode(); |
579 |
|
|
ep1->type = TICK; |
580 |
|
|
ep1->v.tick = -1; |
581 |
|
|
addekid(ep2, ep1); |
582 |
|
|
ep1 = newnode(); |
583 |
|
|
ep1->type = NUM; |
584 |
|
|
addekid(ep2, ep1); |
585 |
|
|
} |
586 |
|
|
|
587 |
|
|
return(ep2); |
588 |
|
|
} |
589 |
|
|
|
590 |
|
|
|
591 |
|
|
#ifdef OUTCHAN |
592 |
|
|
EPNODE * |
593 |
|
|
getchan() /* A -> $N = E1 */ |
594 |
|
|
{ |
595 |
|
|
register EPNODE *ep1, *ep2; |
596 |
|
|
|
597 |
|
|
if (nextc != '$') |
598 |
|
|
syntax("missing '$'"); |
599 |
|
|
scan(); |
600 |
|
|
|
601 |
|
|
ep1 = newnode(); |
602 |
|
|
ep1->type = CHAN; |
603 |
|
|
ep1->v.chan = getinum(); |
604 |
|
|
|
605 |
|
|
if (nextc != '=') |
606 |
|
|
syntax("'=' expected"); |
607 |
|
|
scan(); |
608 |
|
|
|
609 |
|
|
ep2 = newnode(); |
610 |
|
|
ep2->type = '='; |
611 |
|
|
addekid(ep2, ep1); |
612 |
|
|
addekid(ep2, getE1()); |
613 |
|
|
|
614 |
|
|
return(ep2); |
615 |
|
|
} |
616 |
|
|
#endif |
617 |
|
|
|
618 |
|
|
|
619 |
|
|
|
620 |
|
|
/* |
621 |
|
|
* The following routines are for internal use only: |
622 |
|
|
*/ |
623 |
|
|
|
624 |
|
|
|
625 |
|
|
static double |
626 |
|
|
dvalue(name, d) /* evaluate a variable */ |
627 |
|
|
char *name; |
628 |
|
|
EPNODE *d; |
629 |
|
|
{ |
630 |
|
|
register EPNODE *ep1, *ep2; |
631 |
|
|
|
632 |
|
|
if (d == NULL || d->v.kid->type != SYM) { |
633 |
|
|
eputs(name); |
634 |
|
|
eputs(": undefined variable\n"); |
635 |
|
|
quit(1); |
636 |
|
|
} |
637 |
|
|
ep1 = d->v.kid->sibling; /* get expression */ |
638 |
greg |
1.5 |
if (ep1->type == NUM) |
639 |
|
|
return(ep1->v.num); /* return if number */ |
640 |
greg |
1.1 |
ep2 = ep1->sibling; /* check time */ |
641 |
|
|
if (ep2->v.tick < 0 || ep2->v.tick < eclock) { |
642 |
greg |
1.8 |
ep2->v.tick = d->type == ':' ? 1L<<30 : eclock; |
643 |
greg |
1.1 |
ep2 = ep2->sibling; |
644 |
greg |
1.5 |
ep2->v.num = evalue(ep1); /* needs new value */ |
645 |
greg |
1.1 |
} else |
646 |
greg |
1.5 |
ep2 = ep2->sibling; /* else reuse old value */ |
647 |
greg |
1.1 |
|
648 |
|
|
return(ep2->v.num); |
649 |
|
|
} |
650 |
|
|
|
651 |
|
|
|
652 |
|
|
static int |
653 |
|
|
hash(s) /* hash a string */ |
654 |
|
|
register char *s; |
655 |
|
|
{ |
656 |
|
|
register int rval = 0; |
657 |
|
|
|
658 |
|
|
while (*s) |
659 |
|
|
rval += *s++; |
660 |
|
|
|
661 |
|
|
return(rval % NHASH); |
662 |
|
|
} |