1 |
greg |
2.6 |
/* Copyright (c) 1992 Regents of the University of California */ |
2 |
greg |
1.1 |
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3 |
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#ifndef lint |
4 |
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static char SCCSid[] = "$SunId$ LBL"; |
5 |
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#endif |
6 |
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7 |
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/* |
8 |
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* Compute data values using expression parser |
9 |
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* |
10 |
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* 7/1/85 Greg Ward |
11 |
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* |
12 |
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* 11/11/85 Made channel input conditional with (INCHAN) compiles. |
13 |
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* |
14 |
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* 4/2/86 Added conditional compiles for function definitions (FUNCTION). |
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* |
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* 1/29/87 Made variables conditional (VARIABLE) |
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* |
18 |
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* 5/19/88 Added constant subexpression elimination (RCONST) |
19 |
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*/ |
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#include <stdio.h> |
22 |
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23 |
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#include <ctype.h> |
24 |
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25 |
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#include <errno.h> |
26 |
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27 |
greg |
2.8 |
#include <math.h> |
28 |
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29 |
greg |
1.1 |
#include "calcomp.h" |
30 |
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31 |
greg |
2.6 |
#define MAXLINE 256 /* maximum line length */ |
32 |
greg |
1.1 |
|
33 |
greg |
2.6 |
#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
34 |
greg |
1.1 |
|
35 |
greg |
2.6 |
#define isdecimal(c) (isdigit(c) || (c) == '.') |
36 |
greg |
1.1 |
|
37 |
greg |
2.14 |
extern char *savestr(); |
38 |
greg |
1.1 |
extern char *emalloc(), *ecalloc(); |
39 |
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extern EPNODE *curfunc; |
40 |
greg |
1.5 |
extern double efunc(), evariable(); |
41 |
greg |
2.12 |
static double euminus(), eargument(), enumber(); |
42 |
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#ifdef INCHAN |
43 |
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static double echannel(); |
44 |
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#endif |
45 |
greg |
1.5 |
static double eadd(), esubtr(), emult(), edivi(), epow(); |
46 |
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static double ebotch(); |
47 |
greg |
1.1 |
|
48 |
greg |
2.15 |
#ifdef DCL_ATOF |
49 |
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extern double atof(); |
50 |
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#endif |
51 |
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52 |
greg |
1.1 |
int nextc; /* lookahead character */ |
53 |
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54 |
greg |
2.6 |
double (*eoper[])() = { /* expression operations */ |
55 |
greg |
1.1 |
ebotch, |
56 |
greg |
2.6 |
#ifdef VARIABLE |
57 |
greg |
1.1 |
evariable, |
58 |
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#else |
59 |
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ebotch, |
60 |
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#endif |
61 |
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enumber, |
62 |
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euminus, |
63 |
greg |
2.6 |
#ifdef INCHAN |
64 |
greg |
1.1 |
echannel, |
65 |
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#else |
66 |
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ebotch, |
67 |
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#endif |
68 |
greg |
2.6 |
#ifdef FUNCTION |
69 |
greg |
1.1 |
efunc, |
70 |
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eargument, |
71 |
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#else |
72 |
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ebotch, |
73 |
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ebotch, |
74 |
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#endif |
75 |
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ebotch, |
76 |
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ebotch, |
77 |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
78 |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
79 |
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emult, |
80 |
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eadd, |
81 |
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0, |
82 |
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esubtr, |
83 |
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0, |
84 |
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edivi, |
85 |
greg |
1.9 |
0,0,0,0,0,0,0,0,0,0, |
86 |
greg |
1.1 |
ebotch, |
87 |
greg |
1.9 |
0,0, |
88 |
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ebotch, |
89 |
greg |
1.1 |
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
90 |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
91 |
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epow, |
92 |
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}; |
93 |
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94 |
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static FILE *infp; /* input file pointer */ |
95 |
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static char *linbuf; /* line buffer */ |
96 |
greg |
1.6 |
static char *infile; /* input file name */ |
97 |
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static int lineno; /* input line number */ |
98 |
greg |
1.1 |
static int linepos; /* position in buffer */ |
99 |
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100 |
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101 |
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EPNODE * |
102 |
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eparse(expr) /* parse an expression string */ |
103 |
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char *expr; |
104 |
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{ |
105 |
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EPNODE *ep; |
106 |
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107 |
greg |
1.6 |
initstr(expr, NULL, 0); |
108 |
greg |
1.1 |
#if defined(VARIABLE) && defined(FUNCTION) |
109 |
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curfunc = NULL; |
110 |
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#endif |
111 |
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ep = getE1(); |
112 |
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if (nextc != EOF) |
113 |
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syntax("unexpected character"); |
114 |
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return(ep); |
115 |
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} |
116 |
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117 |
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118 |
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double |
119 |
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eval(expr) /* evaluate an expression string */ |
120 |
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char *expr; |
121 |
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{ |
122 |
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register EPNODE *ep; |
123 |
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double rval; |
124 |
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125 |
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ep = eparse(expr); |
126 |
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rval = evalue(ep); |
127 |
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epfree(ep); |
128 |
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return(rval); |
129 |
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} |
130 |
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131 |
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132 |
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epfree(epar) /* free a parse tree */ |
133 |
greg |
2.6 |
register EPNODE *epar; |
134 |
greg |
1.1 |
{ |
135 |
greg |
2.11 |
register EPNODE *ep; |
136 |
greg |
1.1 |
|
137 |
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switch (epar->type) { |
138 |
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139 |
greg |
1.2 |
#if defined(VARIABLE) || defined(FUNCTION) |
140 |
greg |
1.1 |
case VAR: |
141 |
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varfree(epar->v.ln); |
142 |
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break; |
143 |
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144 |
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case SYM: |
145 |
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freestr(epar->v.name); |
146 |
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break; |
147 |
greg |
2.5 |
#endif |
148 |
greg |
1.1 |
|
149 |
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case NUM: |
150 |
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case CHAN: |
151 |
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case ARG: |
152 |
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case TICK: |
153 |
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break; |
154 |
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155 |
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default: |
156 |
greg |
2.11 |
while ((ep = epar->v.kid) != NULL) { |
157 |
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epar->v.kid = ep->sibling; |
158 |
greg |
1.1 |
epfree(ep); |
159 |
greg |
2.10 |
} |
160 |
greg |
1.1 |
break; |
161 |
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162 |
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} |
163 |
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164 |
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efree((char *)epar); |
165 |
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} |
166 |
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167 |
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/* the following used to be a switch */ |
168 |
greg |
2.6 |
#ifdef FUNCTION |
169 |
greg |
1.1 |
static double |
170 |
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eargument(ep) |
171 |
greg |
2.6 |
EPNODE *ep; |
172 |
greg |
1.1 |
{ |
173 |
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return(argument(ep->v.chan)); |
174 |
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} |
175 |
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#endif |
176 |
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177 |
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static double |
178 |
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enumber(ep) |
179 |
greg |
2.6 |
EPNODE *ep; |
180 |
greg |
1.1 |
{ |
181 |
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return(ep->v.num); |
182 |
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} |
183 |
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184 |
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static double |
185 |
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euminus(ep) |
186 |
greg |
2.6 |
EPNODE *ep; |
187 |
greg |
1.1 |
{ |
188 |
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register EPNODE *ep1 = ep->v.kid; |
189 |
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190 |
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return(-evalue(ep1)); |
191 |
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} |
192 |
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193 |
greg |
2.6 |
#ifdef INCHAN |
194 |
greg |
1.1 |
static double |
195 |
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echannel(ep) |
196 |
greg |
2.6 |
EPNODE *ep; |
197 |
greg |
1.1 |
{ |
198 |
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return(chanvalue(ep->v.chan)); |
199 |
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} |
200 |
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#endif |
201 |
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202 |
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static double |
203 |
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eadd(ep) |
204 |
greg |
2.6 |
EPNODE *ep; |
205 |
greg |
1.1 |
{ |
206 |
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register EPNODE *ep1 = ep->v.kid; |
207 |
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208 |
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return(evalue(ep1) + evalue(ep1->sibling)); |
209 |
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} |
210 |
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211 |
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static double |
212 |
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esubtr(ep) |
213 |
greg |
2.6 |
EPNODE *ep; |
214 |
greg |
1.1 |
{ |
215 |
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register EPNODE *ep1 = ep->v.kid; |
216 |
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217 |
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return(evalue(ep1) - evalue(ep1->sibling)); |
218 |
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} |
219 |
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220 |
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static double |
221 |
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emult(ep) |
222 |
greg |
2.6 |
EPNODE *ep; |
223 |
greg |
1.1 |
{ |
224 |
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register EPNODE *ep1 = ep->v.kid; |
225 |
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226 |
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return(evalue(ep1) * evalue(ep1->sibling)); |
227 |
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} |
228 |
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229 |
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static double |
230 |
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edivi(ep) |
231 |
greg |
2.6 |
EPNODE *ep; |
232 |
greg |
1.1 |
{ |
233 |
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register EPNODE *ep1 = ep->v.kid; |
234 |
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double d; |
235 |
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236 |
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d = evalue(ep1->sibling); |
237 |
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if (d == 0.0) { |
238 |
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wputs("Division by zero\n"); |
239 |
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errno = ERANGE; |
240 |
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return(0.0); |
241 |
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} |
242 |
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return(evalue(ep1) / d); |
243 |
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} |
244 |
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245 |
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static double |
246 |
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epow(ep) |
247 |
greg |
2.6 |
EPNODE *ep; |
248 |
greg |
1.1 |
{ |
249 |
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register EPNODE *ep1 = ep->v.kid; |
250 |
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double d; |
251 |
greg |
2.6 |
int lasterrno; |
252 |
greg |
1.1 |
|
253 |
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lasterrno = errno; |
254 |
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errno = 0; |
255 |
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d = pow(evalue(ep1), evalue(ep1->sibling)); |
256 |
greg |
2.6 |
#ifdef IEEE |
257 |
greg |
1.1 |
if (!finite(d)) |
258 |
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errno = EDOM; |
259 |
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#endif |
260 |
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if (errno) { |
261 |
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wputs("Illegal power\n"); |
262 |
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return(0.0); |
263 |
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} |
264 |
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errno = lasterrno; |
265 |
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return(d); |
266 |
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} |
267 |
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|
268 |
|
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static double |
269 |
|
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ebotch(ep) |
270 |
greg |
2.6 |
EPNODE *ep; |
271 |
greg |
1.1 |
{ |
272 |
|
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eputs("Bad expression!\n"); |
273 |
|
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quit(1); |
274 |
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} |
275 |
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276 |
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277 |
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EPNODE * |
278 |
|
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ekid(ep, n) /* return pointer to a node's nth kid */ |
279 |
greg |
2.6 |
register EPNODE *ep; |
280 |
greg |
1.1 |
register int n; |
281 |
|
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{ |
282 |
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|
283 |
|
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for (ep = ep->v.kid; ep != NULL; ep = ep->sibling) |
284 |
|
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if (--n < 0) |
285 |
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break; |
286 |
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|
287 |
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return(ep); |
288 |
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} |
289 |
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290 |
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291 |
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int |
292 |
|
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nekids(ep) /* return # of kids for node ep */ |
293 |
greg |
2.6 |
register EPNODE *ep; |
294 |
greg |
1.1 |
{ |
295 |
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register int n = 0; |
296 |
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|
297 |
|
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for (ep = ep->v.kid; ep != NULL; ep = ep->sibling) |
298 |
|
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n++; |
299 |
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|
300 |
|
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return(n); |
301 |
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} |
302 |
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303 |
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|
304 |
greg |
1.6 |
initfile(fp, fn, ln) /* prepare input file */ |
305 |
greg |
1.1 |
FILE *fp; |
306 |
greg |
1.6 |
char *fn; |
307 |
|
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int ln; |
308 |
greg |
1.1 |
{ |
309 |
greg |
2.6 |
static char inpbuf[MAXLINE]; |
310 |
greg |
1.1 |
|
311 |
|
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infp = fp; |
312 |
|
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linbuf = inpbuf; |
313 |
greg |
1.6 |
infile = fn; |
314 |
|
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lineno = ln; |
315 |
greg |
1.1 |
linepos = 0; |
316 |
|
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inpbuf[0] = '\0'; |
317 |
|
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scan(); |
318 |
|
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} |
319 |
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|
320 |
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|
321 |
greg |
1.6 |
initstr(s, fn, ln) /* prepare input string */ |
322 |
greg |
1.1 |
char *s; |
323 |
greg |
1.6 |
char *fn; |
324 |
|
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int ln; |
325 |
greg |
1.1 |
{ |
326 |
|
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infp = NULL; |
327 |
greg |
1.6 |
infile = fn; |
328 |
|
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lineno = ln; |
329 |
greg |
1.1 |
linbuf = s; |
330 |
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linepos = 0; |
331 |
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scan(); |
332 |
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} |
333 |
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|
334 |
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|
335 |
greg |
1.13 |
getscanpos(fnp, lnp, spp, fpp) /* return current scan position */ |
336 |
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char **fnp; |
337 |
|
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int *lnp; |
338 |
|
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char **spp; |
339 |
|
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FILE **fpp; |
340 |
|
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{ |
341 |
|
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if (fnp != NULL) *fnp = infile; |
342 |
|
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if (lnp != NULL) *lnp = lineno; |
343 |
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if (spp != NULL) *spp = linbuf+linepos; |
344 |
|
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if (fpp != NULL) *fpp = infp; |
345 |
|
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} |
346 |
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|
347 |
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|
348 |
greg |
1.12 |
int |
349 |
|
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scan() /* scan next character, return literal next */ |
350 |
greg |
1.1 |
{ |
351 |
greg |
1.12 |
register int lnext = 0; |
352 |
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|
353 |
greg |
1.1 |
do { |
354 |
|
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if (linbuf[linepos] == '\0') |
355 |
|
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if (infp == NULL || fgets(linbuf, MAXLINE, infp) == NULL) |
356 |
|
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nextc = EOF; |
357 |
|
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else { |
358 |
|
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nextc = linbuf[0]; |
359 |
greg |
1.6 |
lineno++; |
360 |
greg |
1.1 |
linepos = 1; |
361 |
|
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} |
362 |
|
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else |
363 |
|
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nextc = linbuf[linepos++]; |
364 |
greg |
1.12 |
if (!lnext) |
365 |
|
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lnext = nextc; |
366 |
greg |
1.1 |
if (nextc == '{') { |
367 |
|
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scan(); |
368 |
|
|
while (nextc != '}') |
369 |
|
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if (nextc == EOF) |
370 |
|
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syntax("'}' expected"); |
371 |
|
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else |
372 |
|
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scan(); |
373 |
|
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scan(); |
374 |
|
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} |
375 |
|
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} while (isspace(nextc)); |
376 |
greg |
1.12 |
return(lnext); |
377 |
greg |
1.1 |
} |
378 |
|
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|
379 |
|
|
|
380 |
greg |
1.6 |
char * |
381 |
greg |
2.9 |
long2ascii(l) /* convert long to ascii */ |
382 |
greg |
1.6 |
long l; |
383 |
|
|
{ |
384 |
greg |
2.6 |
static char buf[16]; |
385 |
greg |
1.6 |
register char *cp; |
386 |
greg |
2.6 |
int neg = 0; |
387 |
greg |
1.6 |
|
388 |
|
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if (l == 0) |
389 |
|
|
return("0"); |
390 |
|
|
if (l < 0) { |
391 |
|
|
l = -l; |
392 |
|
|
neg++; |
393 |
|
|
} |
394 |
|
|
cp = buf + sizeof(buf); |
395 |
|
|
*--cp = '\0'; |
396 |
|
|
while (l) { |
397 |
|
|
*--cp = l % 10 + '0'; |
398 |
|
|
l /= 10; |
399 |
|
|
} |
400 |
|
|
if (neg) |
401 |
|
|
*--cp = '-'; |
402 |
|
|
return(cp); |
403 |
|
|
} |
404 |
|
|
|
405 |
|
|
|
406 |
greg |
1.1 |
syntax(err) /* report syntax error and quit */ |
407 |
|
|
char *err; |
408 |
|
|
{ |
409 |
|
|
register int i; |
410 |
|
|
|
411 |
greg |
1.6 |
if (infile != NULL || lineno != 0) { |
412 |
|
|
if (infile != NULL) eputs(infile); |
413 |
|
|
if (lineno != 0) { |
414 |
|
|
eputs(infile != NULL ? ", line " : "line "); |
415 |
greg |
2.9 |
eputs(long2ascii((long)lineno)); |
416 |
greg |
1.6 |
} |
417 |
greg |
2.7 |
eputs(":\n"); |
418 |
greg |
1.1 |
} |
419 |
greg |
1.7 |
eputs(linbuf); |
420 |
|
|
if (linbuf[strlen(linbuf)-1] != '\n') |
421 |
|
|
eputs("\n"); |
422 |
|
|
for (i = 0; i < linepos-1; i++) |
423 |
|
|
eputs(linbuf[i] == '\t' ? "\t" : " "); |
424 |
|
|
eputs("^ "); |
425 |
greg |
1.1 |
eputs(err); |
426 |
|
|
eputs("\n"); |
427 |
|
|
quit(1); |
428 |
|
|
} |
429 |
|
|
|
430 |
|
|
|
431 |
|
|
addekid(ep, ekid) /* add a child to ep */ |
432 |
greg |
2.6 |
register EPNODE *ep; |
433 |
|
|
EPNODE *ekid; |
434 |
greg |
1.1 |
{ |
435 |
|
|
if (ep->v.kid == NULL) |
436 |
|
|
ep->v.kid = ekid; |
437 |
|
|
else { |
438 |
|
|
for (ep = ep->v.kid; ep->sibling != NULL; ep = ep->sibling) |
439 |
|
|
; |
440 |
|
|
ep->sibling = ekid; |
441 |
|
|
} |
442 |
|
|
ekid->sibling = NULL; |
443 |
|
|
} |
444 |
|
|
|
445 |
|
|
|
446 |
greg |
2.5 |
#if defined(VARIABLE) || defined(FUNCTION) |
447 |
greg |
1.1 |
char * |
448 |
|
|
getname() /* scan an identifier */ |
449 |
|
|
{ |
450 |
greg |
2.6 |
static char str[MAXWORD+1]; |
451 |
greg |
1.12 |
register int i, lnext; |
452 |
greg |
1.1 |
|
453 |
greg |
1.12 |
lnext = nextc; |
454 |
|
|
for (i = 0; i < MAXWORD && isid(lnext); i++, lnext = scan()) |
455 |
|
|
str[i] = lnext; |
456 |
greg |
1.1 |
str[i] = '\0'; |
457 |
greg |
1.15 |
while (isid(lnext)) /* skip rest of name */ |
458 |
|
|
lnext = scan(); |
459 |
greg |
1.1 |
|
460 |
|
|
return(str); |
461 |
|
|
} |
462 |
greg |
2.5 |
#endif |
463 |
greg |
1.1 |
|
464 |
|
|
|
465 |
|
|
int |
466 |
|
|
getinum() /* scan a positive integer */ |
467 |
|
|
{ |
468 |
greg |
1.12 |
register int n, lnext; |
469 |
greg |
1.1 |
|
470 |
|
|
n = 0; |
471 |
greg |
1.12 |
lnext = nextc; |
472 |
|
|
while (isdigit(lnext)) { |
473 |
|
|
n = n * 10 + lnext - '0'; |
474 |
|
|
lnext = scan(); |
475 |
greg |
1.1 |
} |
476 |
|
|
return(n); |
477 |
|
|
} |
478 |
|
|
|
479 |
|
|
|
480 |
|
|
double |
481 |
|
|
getnum() /* scan a positive float */ |
482 |
|
|
{ |
483 |
greg |
1.12 |
register int i, lnext; |
484 |
greg |
1.1 |
char str[MAXWORD+1]; |
485 |
|
|
|
486 |
|
|
i = 0; |
487 |
greg |
1.12 |
lnext = nextc; |
488 |
|
|
while (isdigit(lnext) && i < MAXWORD) { |
489 |
|
|
str[i++] = lnext; |
490 |
|
|
lnext = scan(); |
491 |
greg |
1.1 |
} |
492 |
greg |
1.12 |
if (lnext == '.' && i < MAXWORD) { |
493 |
greg |
2.6 |
str[i++] = lnext; |
494 |
|
|
lnext = scan(); |
495 |
greg |
1.12 |
while (isdigit(lnext) && i < MAXWORD) { |
496 |
|
|
str[i++] = lnext; |
497 |
|
|
lnext = scan(); |
498 |
greg |
1.1 |
} |
499 |
|
|
} |
500 |
greg |
1.12 |
if ((lnext == 'e' || lnext == 'E') && i < MAXWORD) { |
501 |
greg |
2.6 |
str[i++] = lnext; |
502 |
|
|
lnext = scan(); |
503 |
greg |
1.12 |
if ((lnext == '-' || lnext == '+') && i < MAXWORD) { |
504 |
|
|
str[i++] = lnext; |
505 |
|
|
lnext = scan(); |
506 |
greg |
1.1 |
} |
507 |
greg |
1.12 |
while (isdigit(lnext) && i < MAXWORD) { |
508 |
|
|
str[i++] = lnext; |
509 |
|
|
lnext = scan(); |
510 |
greg |
1.1 |
} |
511 |
|
|
} |
512 |
|
|
str[i] = '\0'; |
513 |
|
|
|
514 |
|
|
return(atof(str)); |
515 |
|
|
} |
516 |
|
|
|
517 |
|
|
|
518 |
|
|
EPNODE * |
519 |
|
|
getE1() /* E1 -> E1 ADDOP E2 */ |
520 |
greg |
2.6 |
/* E2 */ |
521 |
greg |
1.1 |
{ |
522 |
|
|
register EPNODE *ep1, *ep2; |
523 |
|
|
|
524 |
|
|
ep1 = getE2(); |
525 |
|
|
while (nextc == '+' || nextc == '-') { |
526 |
|
|
ep2 = newnode(); |
527 |
|
|
ep2->type = nextc; |
528 |
|
|
scan(); |
529 |
|
|
addekid(ep2, ep1); |
530 |
|
|
addekid(ep2, getE2()); |
531 |
greg |
2.6 |
#ifdef RCONST |
532 |
greg |
1.1 |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
533 |
|
|
ep2 = rconst(ep2); |
534 |
|
|
#endif |
535 |
|
|
ep1 = ep2; |
536 |
|
|
} |
537 |
|
|
return(ep1); |
538 |
|
|
} |
539 |
|
|
|
540 |
|
|
|
541 |
|
|
EPNODE * |
542 |
|
|
getE2() /* E2 -> E2 MULOP E3 */ |
543 |
greg |
2.6 |
/* E3 */ |
544 |
greg |
1.1 |
{ |
545 |
|
|
register EPNODE *ep1, *ep2; |
546 |
|
|
|
547 |
|
|
ep1 = getE3(); |
548 |
|
|
while (nextc == '*' || nextc == '/') { |
549 |
|
|
ep2 = newnode(); |
550 |
|
|
ep2->type = nextc; |
551 |
|
|
scan(); |
552 |
|
|
addekid(ep2, ep1); |
553 |
|
|
addekid(ep2, getE3()); |
554 |
greg |
2.6 |
#ifdef RCONST |
555 |
greg |
1.1 |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
556 |
|
|
ep2 = rconst(ep2); |
557 |
|
|
#endif |
558 |
|
|
ep1 = ep2; |
559 |
|
|
} |
560 |
|
|
return(ep1); |
561 |
|
|
} |
562 |
|
|
|
563 |
|
|
|
564 |
|
|
EPNODE * |
565 |
greg |
1.8 |
getE3() /* E3 -> E4 ^ E3 */ |
566 |
greg |
2.6 |
/* E4 */ |
567 |
greg |
1.1 |
{ |
568 |
|
|
register EPNODE *ep1, *ep2; |
569 |
|
|
|
570 |
|
|
ep1 = getE4(); |
571 |
greg |
1.8 |
if (nextc == '^') { |
572 |
greg |
1.1 |
ep2 = newnode(); |
573 |
|
|
ep2->type = nextc; |
574 |
|
|
scan(); |
575 |
|
|
addekid(ep2, ep1); |
576 |
greg |
1.8 |
addekid(ep2, getE3()); |
577 |
greg |
2.6 |
#ifdef RCONST |
578 |
greg |
1.1 |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
579 |
|
|
ep2 = rconst(ep2); |
580 |
|
|
#endif |
581 |
greg |
1.8 |
return(ep2); |
582 |
greg |
1.1 |
} |
583 |
|
|
return(ep1); |
584 |
|
|
} |
585 |
|
|
|
586 |
|
|
|
587 |
|
|
EPNODE * |
588 |
|
|
getE4() /* E4 -> ADDOP E5 */ |
589 |
greg |
2.6 |
/* E5 */ |
590 |
greg |
1.1 |
{ |
591 |
greg |
1.3 |
register EPNODE *ep1, *ep2; |
592 |
greg |
1.1 |
|
593 |
|
|
if (nextc == '-') { |
594 |
|
|
scan(); |
595 |
greg |
1.3 |
ep2 = getE5(); |
596 |
|
|
if (ep2->type == NUM) { |
597 |
|
|
ep2->v.num = -ep2->v.num; |
598 |
|
|
return(ep2); |
599 |
|
|
} |
600 |
greg |
1.16 |
if (ep2->type == UMINUS) { /* don't generate -(-E5) */ |
601 |
|
|
efree((char *)ep2); |
602 |
|
|
return(ep2->v.kid); |
603 |
|
|
} |
604 |
greg |
1.1 |
ep1 = newnode(); |
605 |
|
|
ep1->type = UMINUS; |
606 |
greg |
1.3 |
addekid(ep1, ep2); |
607 |
greg |
1.1 |
return(ep1); |
608 |
|
|
} |
609 |
|
|
if (nextc == '+') |
610 |
|
|
scan(); |
611 |
|
|
return(getE5()); |
612 |
|
|
} |
613 |
|
|
|
614 |
|
|
|
615 |
|
|
EPNODE * |
616 |
|
|
getE5() /* E5 -> (E1) */ |
617 |
greg |
2.6 |
/* VAR */ |
618 |
|
|
/* NUM */ |
619 |
|
|
/* $N */ |
620 |
|
|
/* FUNC(E1,..) */ |
621 |
|
|
/* ARG */ |
622 |
greg |
1.1 |
{ |
623 |
greg |
2.6 |
int i; |
624 |
greg |
1.14 |
char *nam; |
625 |
greg |
1.1 |
register EPNODE *ep1, *ep2; |
626 |
|
|
|
627 |
|
|
if (nextc == '(') { |
628 |
|
|
scan(); |
629 |
|
|
ep1 = getE1(); |
630 |
|
|
if (nextc != ')') |
631 |
|
|
syntax("')' expected"); |
632 |
|
|
scan(); |
633 |
|
|
return(ep1); |
634 |
|
|
} |
635 |
|
|
|
636 |
greg |
2.6 |
#ifdef INCHAN |
637 |
greg |
1.1 |
if (nextc == '$') { |
638 |
|
|
scan(); |
639 |
|
|
ep1 = newnode(); |
640 |
|
|
ep1->type = CHAN; |
641 |
|
|
ep1->v.chan = getinum(); |
642 |
|
|
return(ep1); |
643 |
|
|
} |
644 |
|
|
#endif |
645 |
|
|
|
646 |
|
|
#if defined(VARIABLE) || defined(FUNCTION) |
647 |
greg |
1.15 |
if (isalpha(nextc) || nextc == CNTXMARK) { |
648 |
greg |
1.14 |
nam = getname(); |
649 |
greg |
1.1 |
#if defined(VARIABLE) && defined(FUNCTION) |
650 |
greg |
1.14 |
ep1 = NULL; |
651 |
greg |
1.1 |
if (curfunc != NULL) |
652 |
|
|
for (i = 1, ep2 = curfunc->v.kid->sibling; |
653 |
greg |
2.6 |
ep2 != NULL; i++, ep2 = ep2->sibling) |
654 |
greg |
1.14 |
if (!strcmp(ep2->v.name, nam)) { |
655 |
greg |
1.1 |
ep1 = newnode(); |
656 |
|
|
ep1->type = ARG; |
657 |
|
|
ep1->v.chan = i; |
658 |
|
|
break; |
659 |
|
|
} |
660 |
greg |
1.14 |
if (ep1 == NULL) |
661 |
greg |
1.1 |
#endif |
662 |
greg |
1.14 |
{ |
663 |
|
|
ep1 = newnode(); |
664 |
|
|
ep1->type = VAR; |
665 |
|
|
ep1->v.ln = varinsert(nam); |
666 |
|
|
} |
667 |
greg |
2.6 |
#ifdef FUNCTION |
668 |
greg |
1.1 |
if (nextc == '(') { |
669 |
|
|
ep2 = newnode(); |
670 |
|
|
ep2->type = FUNC; |
671 |
|
|
addekid(ep2, ep1); |
672 |
|
|
ep1 = ep2; |
673 |
|
|
do { |
674 |
|
|
scan(); |
675 |
|
|
addekid(ep1, getE1()); |
676 |
|
|
} while (nextc == ','); |
677 |
|
|
if (nextc != ')') |
678 |
|
|
syntax("')' expected"); |
679 |
|
|
scan(); |
680 |
|
|
} |
681 |
greg |
2.6 |
#ifndef VARIABLE |
682 |
greg |
1.1 |
else |
683 |
|
|
syntax("'(' expected"); |
684 |
|
|
#endif |
685 |
|
|
#endif |
686 |
greg |
2.6 |
#ifdef RCONST |
687 |
greg |
1.9 |
if (isconstvar(ep1)) |
688 |
|
|
ep1 = rconst(ep1); |
689 |
|
|
#endif |
690 |
greg |
1.1 |
return(ep1); |
691 |
|
|
} |
692 |
|
|
#endif |
693 |
|
|
|
694 |
|
|
if (isdecimal(nextc)) { |
695 |
|
|
ep1 = newnode(); |
696 |
|
|
ep1->type = NUM; |
697 |
|
|
ep1->v.num = getnum(); |
698 |
|
|
return(ep1); |
699 |
|
|
} |
700 |
|
|
syntax("unexpected character"); |
701 |
|
|
} |
702 |
|
|
|
703 |
|
|
|
704 |
greg |
2.6 |
#ifdef RCONST |
705 |
greg |
1.1 |
EPNODE * |
706 |
|
|
rconst(epar) /* reduce a constant expression */ |
707 |
greg |
2.6 |
register EPNODE *epar; |
708 |
greg |
1.1 |
{ |
709 |
|
|
register EPNODE *ep; |
710 |
|
|
|
711 |
|
|
ep = newnode(); |
712 |
|
|
ep->type = NUM; |
713 |
|
|
errno = 0; |
714 |
|
|
ep->v.num = evalue(epar); |
715 |
|
|
if (errno) |
716 |
greg |
2.6 |
syntax("bad constant expression"); |
717 |
greg |
1.1 |
epfree(epar); |
718 |
|
|
|
719 |
|
|
return(ep); |
720 |
greg |
1.9 |
} |
721 |
|
|
|
722 |
|
|
|
723 |
greg |
1.11 |
isconstvar(ep) /* is ep linked to a constant expression? */ |
724 |
greg |
2.6 |
register EPNODE *ep; |
725 |
greg |
1.9 |
{ |
726 |
greg |
2.6 |
#ifdef VARIABLE |
727 |
greg |
1.9 |
register EPNODE *ep1; |
728 |
greg |
2.6 |
#ifdef FUNCTION |
729 |
greg |
1.10 |
|
730 |
greg |
1.9 |
if (ep->type == FUNC) { |
731 |
greg |
1.11 |
if (!isconstfun(ep->v.kid)) |
732 |
|
|
return(0); |
733 |
greg |
1.9 |
for (ep1 = ep->v.kid->sibling; ep1 != NULL; ep1 = ep1->sibling) |
734 |
greg |
1.11 |
if (ep1->type != NUM && !isconstfun(ep1)) |
735 |
greg |
1.9 |
return(0); |
736 |
|
|
return(1); |
737 |
|
|
} |
738 |
|
|
#endif |
739 |
|
|
if (ep->type != VAR) |
740 |
|
|
return(0); |
741 |
|
|
ep1 = ep->v.ln->def; |
742 |
|
|
if (ep1 == NULL || ep1->type != ':') |
743 |
|
|
return(0); |
744 |
greg |
2.6 |
#ifdef FUNCTION |
745 |
greg |
1.9 |
if (ep1->v.kid->type != SYM) |
746 |
|
|
return(0); |
747 |
|
|
#endif |
748 |
|
|
return(1); |
749 |
|
|
#else |
750 |
|
|
return(ep->type == FUNC); |
751 |
|
|
#endif |
752 |
greg |
1.1 |
} |
753 |
greg |
1.11 |
|
754 |
|
|
|
755 |
|
|
#if defined(FUNCTION) && defined(VARIABLE) |
756 |
|
|
isconstfun(ep) /* is ep linked to a constant function? */ |
757 |
greg |
2.6 |
register EPNODE *ep; |
758 |
greg |
1.11 |
{ |
759 |
|
|
register EPNODE *dp; |
760 |
|
|
register LIBR *lp; |
761 |
|
|
|
762 |
|
|
if (ep->type != VAR) |
763 |
|
|
return(0); |
764 |
greg |
2.3 |
if ((dp = ep->v.ln->def) != NULL && dp->v.kid->type == FUNC) |
765 |
|
|
return(dp->type == ':'); |
766 |
greg |
2.4 |
if ((lp = ep->v.ln->lib) != NULL) |
767 |
greg |
2.3 |
return(lp->atyp == ':'); |
768 |
|
|
return(0); |
769 |
greg |
1.11 |
} |
770 |
|
|
#endif |
771 |
greg |
1.1 |
#endif |