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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* |
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* 11/11/85 Made channel input conditional with (INCHAN) compiles. |
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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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* 1/29/87 Made variables conditional (VARIABLE) |
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* |
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* 5/19/88 Added constant subexpression elimination (RCONST) |
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*/ |
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#include <stdio.h> |
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23 |
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#include <ctype.h> |
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25 |
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#include <errno.h> |
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27 |
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#include "calcomp.h" |
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29 |
greg |
2.6 |
#define MAXLINE 256 /* maximum line length */ |
30 |
greg |
1.1 |
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31 |
greg |
2.6 |
#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
32 |
greg |
1.1 |
|
33 |
greg |
2.6 |
#define isdecimal(c) (isdigit(c) || (c) == '.') |
34 |
greg |
1.1 |
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35 |
greg |
2.2 |
#ifndef atof |
36 |
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extern double atof(); |
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#endif |
38 |
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extern double pow(); |
39 |
greg |
1.1 |
extern char *fgets(), *savestr(); |
40 |
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extern char *emalloc(), *ecalloc(); |
41 |
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extern EPNODE *curfunc; |
42 |
greg |
1.5 |
extern double efunc(), evariable(); |
43 |
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static double euminus(), echannel(), eargument(), enumber(); |
44 |
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static double eadd(), esubtr(), emult(), edivi(), epow(); |
45 |
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static double ebotch(); |
46 |
greg |
1.1 |
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47 |
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int nextc; /* lookahead character */ |
48 |
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49 |
greg |
2.6 |
double (*eoper[])() = { /* expression operations */ |
50 |
greg |
1.1 |
ebotch, |
51 |
greg |
2.6 |
#ifdef VARIABLE |
52 |
greg |
1.1 |
evariable, |
53 |
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#else |
54 |
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ebotch, |
55 |
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#endif |
56 |
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enumber, |
57 |
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euminus, |
58 |
greg |
2.6 |
#ifdef INCHAN |
59 |
greg |
1.1 |
echannel, |
60 |
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#else |
61 |
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ebotch, |
62 |
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#endif |
63 |
greg |
2.6 |
#ifdef FUNCTION |
64 |
greg |
1.1 |
efunc, |
65 |
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eargument, |
66 |
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#else |
67 |
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ebotch, |
68 |
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ebotch, |
69 |
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#endif |
70 |
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ebotch, |
71 |
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ebotch, |
72 |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
73 |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
74 |
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emult, |
75 |
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eadd, |
76 |
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0, |
77 |
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esubtr, |
78 |
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0, |
79 |
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edivi, |
80 |
greg |
1.9 |
0,0,0,0,0,0,0,0,0,0, |
81 |
greg |
1.1 |
ebotch, |
82 |
greg |
1.9 |
0,0, |
83 |
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ebotch, |
84 |
greg |
1.1 |
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
85 |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
86 |
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epow, |
87 |
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}; |
88 |
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89 |
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static FILE *infp; /* input file pointer */ |
90 |
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static char *linbuf; /* line buffer */ |
91 |
greg |
1.6 |
static char *infile; /* input file name */ |
92 |
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static int lineno; /* input line number */ |
93 |
greg |
1.1 |
static int linepos; /* position in buffer */ |
94 |
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95 |
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96 |
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EPNODE * |
97 |
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eparse(expr) /* parse an expression string */ |
98 |
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char *expr; |
99 |
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{ |
100 |
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EPNODE *ep; |
101 |
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102 |
greg |
1.6 |
initstr(expr, NULL, 0); |
103 |
greg |
1.1 |
#if defined(VARIABLE) && defined(FUNCTION) |
104 |
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curfunc = NULL; |
105 |
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#endif |
106 |
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ep = getE1(); |
107 |
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if (nextc != EOF) |
108 |
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syntax("unexpected character"); |
109 |
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return(ep); |
110 |
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} |
111 |
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112 |
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113 |
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double |
114 |
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eval(expr) /* evaluate an expression string */ |
115 |
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char *expr; |
116 |
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{ |
117 |
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register EPNODE *ep; |
118 |
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double rval; |
119 |
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120 |
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ep = eparse(expr); |
121 |
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rval = evalue(ep); |
122 |
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epfree(ep); |
123 |
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return(rval); |
124 |
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} |
125 |
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126 |
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127 |
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epfree(epar) /* free a parse tree */ |
128 |
greg |
2.6 |
register EPNODE *epar; |
129 |
greg |
1.1 |
{ |
130 |
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register EPNODE *ep; |
131 |
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132 |
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switch (epar->type) { |
133 |
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134 |
greg |
1.2 |
#if defined(VARIABLE) || defined(FUNCTION) |
135 |
greg |
1.1 |
case VAR: |
136 |
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varfree(epar->v.ln); |
137 |
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break; |
138 |
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139 |
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case SYM: |
140 |
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freestr(epar->v.name); |
141 |
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break; |
142 |
greg |
2.5 |
#endif |
143 |
greg |
1.1 |
|
144 |
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case NUM: |
145 |
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case CHAN: |
146 |
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case ARG: |
147 |
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case TICK: |
148 |
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break; |
149 |
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150 |
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default: |
151 |
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for (ep = epar->v.kid; ep != NULL; ep = ep->sibling) |
152 |
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epfree(ep); |
153 |
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break; |
154 |
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155 |
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} |
156 |
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157 |
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efree((char *)epar); |
158 |
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} |
159 |
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160 |
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/* the following used to be a switch */ |
161 |
greg |
2.6 |
#ifdef FUNCTION |
162 |
greg |
1.1 |
static double |
163 |
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eargument(ep) |
164 |
greg |
2.6 |
EPNODE *ep; |
165 |
greg |
1.1 |
{ |
166 |
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return(argument(ep->v.chan)); |
167 |
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} |
168 |
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#endif |
169 |
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170 |
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static double |
171 |
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enumber(ep) |
172 |
greg |
2.6 |
EPNODE *ep; |
173 |
greg |
1.1 |
{ |
174 |
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return(ep->v.num); |
175 |
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} |
176 |
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177 |
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static double |
178 |
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euminus(ep) |
179 |
greg |
2.6 |
EPNODE *ep; |
180 |
greg |
1.1 |
{ |
181 |
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register EPNODE *ep1 = ep->v.kid; |
182 |
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183 |
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return(-evalue(ep1)); |
184 |
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} |
185 |
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186 |
greg |
2.6 |
#ifdef INCHAN |
187 |
greg |
1.1 |
static double |
188 |
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echannel(ep) |
189 |
greg |
2.6 |
EPNODE *ep; |
190 |
greg |
1.1 |
{ |
191 |
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return(chanvalue(ep->v.chan)); |
192 |
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} |
193 |
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#endif |
194 |
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195 |
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static double |
196 |
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eadd(ep) |
197 |
greg |
2.6 |
EPNODE *ep; |
198 |
greg |
1.1 |
{ |
199 |
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register EPNODE *ep1 = ep->v.kid; |
200 |
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201 |
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return(evalue(ep1) + evalue(ep1->sibling)); |
202 |
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} |
203 |
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204 |
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static double |
205 |
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esubtr(ep) |
206 |
greg |
2.6 |
EPNODE *ep; |
207 |
greg |
1.1 |
{ |
208 |
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register EPNODE *ep1 = ep->v.kid; |
209 |
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210 |
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return(evalue(ep1) - evalue(ep1->sibling)); |
211 |
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} |
212 |
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213 |
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static double |
214 |
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emult(ep) |
215 |
greg |
2.6 |
EPNODE *ep; |
216 |
greg |
1.1 |
{ |
217 |
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register EPNODE *ep1 = ep->v.kid; |
218 |
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219 |
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return(evalue(ep1) * evalue(ep1->sibling)); |
220 |
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} |
221 |
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222 |
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static double |
223 |
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edivi(ep) |
224 |
greg |
2.6 |
EPNODE *ep; |
225 |
greg |
1.1 |
{ |
226 |
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register EPNODE *ep1 = ep->v.kid; |
227 |
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double d; |
228 |
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229 |
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d = evalue(ep1->sibling); |
230 |
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if (d == 0.0) { |
231 |
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wputs("Division by zero\n"); |
232 |
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errno = ERANGE; |
233 |
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return(0.0); |
234 |
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} |
235 |
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return(evalue(ep1) / d); |
236 |
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} |
237 |
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238 |
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static double |
239 |
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epow(ep) |
240 |
greg |
2.6 |
EPNODE *ep; |
241 |
greg |
1.1 |
{ |
242 |
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register EPNODE *ep1 = ep->v.kid; |
243 |
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double d; |
244 |
greg |
2.6 |
int lasterrno; |
245 |
greg |
1.1 |
|
246 |
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lasterrno = errno; |
247 |
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errno = 0; |
248 |
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d = pow(evalue(ep1), evalue(ep1->sibling)); |
249 |
greg |
2.6 |
#ifdef IEEE |
250 |
greg |
1.1 |
if (!finite(d)) |
251 |
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errno = EDOM; |
252 |
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#endif |
253 |
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if (errno) { |
254 |
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wputs("Illegal power\n"); |
255 |
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return(0.0); |
256 |
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} |
257 |
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errno = lasterrno; |
258 |
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return(d); |
259 |
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} |
260 |
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261 |
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static double |
262 |
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ebotch(ep) |
263 |
greg |
2.6 |
EPNODE *ep; |
264 |
greg |
1.1 |
{ |
265 |
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eputs("Bad expression!\n"); |
266 |
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quit(1); |
267 |
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} |
268 |
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269 |
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270 |
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EPNODE * |
271 |
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ekid(ep, n) /* return pointer to a node's nth kid */ |
272 |
greg |
2.6 |
register EPNODE *ep; |
273 |
greg |
1.1 |
register int n; |
274 |
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{ |
275 |
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276 |
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for (ep = ep->v.kid; ep != NULL; ep = ep->sibling) |
277 |
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if (--n < 0) |
278 |
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break; |
279 |
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280 |
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return(ep); |
281 |
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} |
282 |
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283 |
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284 |
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int |
285 |
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nekids(ep) /* return # of kids for node ep */ |
286 |
greg |
2.6 |
register EPNODE *ep; |
287 |
greg |
1.1 |
{ |
288 |
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register int n = 0; |
289 |
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|
290 |
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for (ep = ep->v.kid; ep != NULL; ep = ep->sibling) |
291 |
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n++; |
292 |
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293 |
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return(n); |
294 |
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} |
295 |
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296 |
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297 |
greg |
1.6 |
initfile(fp, fn, ln) /* prepare input file */ |
298 |
greg |
1.1 |
FILE *fp; |
299 |
greg |
1.6 |
char *fn; |
300 |
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int ln; |
301 |
greg |
1.1 |
{ |
302 |
greg |
2.6 |
static char inpbuf[MAXLINE]; |
303 |
greg |
1.1 |
|
304 |
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infp = fp; |
305 |
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linbuf = inpbuf; |
306 |
greg |
1.6 |
infile = fn; |
307 |
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lineno = ln; |
308 |
greg |
1.1 |
linepos = 0; |
309 |
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inpbuf[0] = '\0'; |
310 |
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scan(); |
311 |
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} |
312 |
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313 |
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|
314 |
greg |
1.6 |
initstr(s, fn, ln) /* prepare input string */ |
315 |
greg |
1.1 |
char *s; |
316 |
greg |
1.6 |
char *fn; |
317 |
|
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int ln; |
318 |
greg |
1.1 |
{ |
319 |
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infp = NULL; |
320 |
greg |
1.6 |
infile = fn; |
321 |
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lineno = ln; |
322 |
greg |
1.1 |
linbuf = s; |
323 |
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linepos = 0; |
324 |
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scan(); |
325 |
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} |
326 |
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327 |
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328 |
greg |
1.13 |
getscanpos(fnp, lnp, spp, fpp) /* return current scan position */ |
329 |
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char **fnp; |
330 |
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int *lnp; |
331 |
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char **spp; |
332 |
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FILE **fpp; |
333 |
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{ |
334 |
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if (fnp != NULL) *fnp = infile; |
335 |
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if (lnp != NULL) *lnp = lineno; |
336 |
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if (spp != NULL) *spp = linbuf+linepos; |
337 |
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if (fpp != NULL) *fpp = infp; |
338 |
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} |
339 |
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|
340 |
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|
341 |
greg |
1.12 |
int |
342 |
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scan() /* scan next character, return literal next */ |
343 |
greg |
1.1 |
{ |
344 |
greg |
1.12 |
register int lnext = 0; |
345 |
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|
346 |
greg |
1.1 |
do { |
347 |
|
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if (linbuf[linepos] == '\0') |
348 |
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if (infp == NULL || fgets(linbuf, MAXLINE, infp) == NULL) |
349 |
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nextc = EOF; |
350 |
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else { |
351 |
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nextc = linbuf[0]; |
352 |
greg |
1.6 |
lineno++; |
353 |
greg |
1.1 |
linepos = 1; |
354 |
|
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} |
355 |
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else |
356 |
|
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nextc = linbuf[linepos++]; |
357 |
greg |
1.12 |
if (!lnext) |
358 |
|
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lnext = nextc; |
359 |
greg |
1.1 |
if (nextc == '{') { |
360 |
|
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scan(); |
361 |
|
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while (nextc != '}') |
362 |
|
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if (nextc == EOF) |
363 |
|
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syntax("'}' expected"); |
364 |
|
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else |
365 |
|
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scan(); |
366 |
|
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scan(); |
367 |
|
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} |
368 |
|
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} while (isspace(nextc)); |
369 |
greg |
1.12 |
return(lnext); |
370 |
greg |
1.1 |
} |
371 |
|
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|
372 |
|
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|
373 |
greg |
1.6 |
char * |
374 |
|
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ltoa(l) /* convert long to ascii */ |
375 |
|
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long l; |
376 |
|
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{ |
377 |
greg |
2.6 |
static char buf[16]; |
378 |
greg |
1.6 |
register char *cp; |
379 |
greg |
2.6 |
int neg = 0; |
380 |
greg |
1.6 |
|
381 |
|
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if (l == 0) |
382 |
|
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return("0"); |
383 |
|
|
if (l < 0) { |
384 |
|
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l = -l; |
385 |
|
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neg++; |
386 |
|
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} |
387 |
|
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cp = buf + sizeof(buf); |
388 |
|
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*--cp = '\0'; |
389 |
|
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while (l) { |
390 |
|
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*--cp = l % 10 + '0'; |
391 |
|
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l /= 10; |
392 |
|
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} |
393 |
|
|
if (neg) |
394 |
|
|
*--cp = '-'; |
395 |
|
|
return(cp); |
396 |
|
|
} |
397 |
|
|
|
398 |
|
|
|
399 |
greg |
1.1 |
syntax(err) /* report syntax error and quit */ |
400 |
|
|
char *err; |
401 |
|
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{ |
402 |
|
|
register int i; |
403 |
|
|
|
404 |
greg |
1.6 |
if (infile != NULL || lineno != 0) { |
405 |
|
|
if (infile != NULL) eputs(infile); |
406 |
|
|
if (lineno != 0) { |
407 |
|
|
eputs(infile != NULL ? ", line " : "line "); |
408 |
|
|
eputs(ltoa((long)lineno)); |
409 |
|
|
} |
410 |
greg |
1.7 |
eputs(": syntax error:\n"); |
411 |
greg |
1.1 |
} |
412 |
greg |
1.7 |
eputs(linbuf); |
413 |
|
|
if (linbuf[strlen(linbuf)-1] != '\n') |
414 |
|
|
eputs("\n"); |
415 |
|
|
for (i = 0; i < linepos-1; i++) |
416 |
|
|
eputs(linbuf[i] == '\t' ? "\t" : " "); |
417 |
|
|
eputs("^ "); |
418 |
greg |
1.1 |
eputs(err); |
419 |
|
|
eputs("\n"); |
420 |
|
|
quit(1); |
421 |
|
|
} |
422 |
|
|
|
423 |
|
|
|
424 |
|
|
addekid(ep, ekid) /* add a child to ep */ |
425 |
greg |
2.6 |
register EPNODE *ep; |
426 |
|
|
EPNODE *ekid; |
427 |
greg |
1.1 |
{ |
428 |
|
|
if (ep->v.kid == NULL) |
429 |
|
|
ep->v.kid = ekid; |
430 |
|
|
else { |
431 |
|
|
for (ep = ep->v.kid; ep->sibling != NULL; ep = ep->sibling) |
432 |
|
|
; |
433 |
|
|
ep->sibling = ekid; |
434 |
|
|
} |
435 |
|
|
ekid->sibling = NULL; |
436 |
|
|
} |
437 |
|
|
|
438 |
|
|
|
439 |
greg |
2.5 |
#if defined(VARIABLE) || defined(FUNCTION) |
440 |
greg |
1.1 |
char * |
441 |
|
|
getname() /* scan an identifier */ |
442 |
|
|
{ |
443 |
greg |
2.6 |
static char str[MAXWORD+1]; |
444 |
greg |
1.12 |
register int i, lnext; |
445 |
greg |
1.1 |
|
446 |
greg |
1.12 |
lnext = nextc; |
447 |
|
|
for (i = 0; i < MAXWORD && isid(lnext); i++, lnext = scan()) |
448 |
|
|
str[i] = lnext; |
449 |
greg |
1.1 |
str[i] = '\0'; |
450 |
greg |
1.15 |
while (isid(lnext)) /* skip rest of name */ |
451 |
|
|
lnext = scan(); |
452 |
greg |
1.1 |
|
453 |
|
|
return(str); |
454 |
|
|
} |
455 |
greg |
2.5 |
#endif |
456 |
greg |
1.1 |
|
457 |
|
|
|
458 |
|
|
int |
459 |
|
|
getinum() /* scan a positive integer */ |
460 |
|
|
{ |
461 |
greg |
1.12 |
register int n, lnext; |
462 |
greg |
1.1 |
|
463 |
|
|
n = 0; |
464 |
greg |
1.12 |
lnext = nextc; |
465 |
|
|
while (isdigit(lnext)) { |
466 |
|
|
n = n * 10 + lnext - '0'; |
467 |
|
|
lnext = scan(); |
468 |
greg |
1.1 |
} |
469 |
|
|
return(n); |
470 |
|
|
} |
471 |
|
|
|
472 |
|
|
|
473 |
|
|
double |
474 |
|
|
getnum() /* scan a positive float */ |
475 |
|
|
{ |
476 |
greg |
1.12 |
register int i, lnext; |
477 |
greg |
1.1 |
char str[MAXWORD+1]; |
478 |
|
|
|
479 |
|
|
i = 0; |
480 |
greg |
1.12 |
lnext = nextc; |
481 |
|
|
while (isdigit(lnext) && i < MAXWORD) { |
482 |
|
|
str[i++] = lnext; |
483 |
|
|
lnext = scan(); |
484 |
greg |
1.1 |
} |
485 |
greg |
1.12 |
if (lnext == '.' && i < MAXWORD) { |
486 |
greg |
2.6 |
str[i++] = lnext; |
487 |
|
|
lnext = scan(); |
488 |
greg |
1.12 |
while (isdigit(lnext) && i < MAXWORD) { |
489 |
|
|
str[i++] = lnext; |
490 |
|
|
lnext = scan(); |
491 |
greg |
1.1 |
} |
492 |
|
|
} |
493 |
greg |
1.12 |
if ((lnext == 'e' || lnext == 'E') && i < MAXWORD) { |
494 |
greg |
2.6 |
str[i++] = lnext; |
495 |
|
|
lnext = scan(); |
496 |
greg |
1.12 |
if ((lnext == '-' || lnext == '+') && i < MAXWORD) { |
497 |
|
|
str[i++] = lnext; |
498 |
|
|
lnext = scan(); |
499 |
greg |
1.1 |
} |
500 |
greg |
1.12 |
while (isdigit(lnext) && i < MAXWORD) { |
501 |
|
|
str[i++] = lnext; |
502 |
|
|
lnext = scan(); |
503 |
greg |
1.1 |
} |
504 |
|
|
} |
505 |
|
|
str[i] = '\0'; |
506 |
|
|
|
507 |
|
|
return(atof(str)); |
508 |
|
|
} |
509 |
|
|
|
510 |
|
|
|
511 |
|
|
EPNODE * |
512 |
|
|
getE1() /* E1 -> E1 ADDOP E2 */ |
513 |
greg |
2.6 |
/* E2 */ |
514 |
greg |
1.1 |
{ |
515 |
|
|
register EPNODE *ep1, *ep2; |
516 |
|
|
|
517 |
|
|
ep1 = getE2(); |
518 |
|
|
while (nextc == '+' || nextc == '-') { |
519 |
|
|
ep2 = newnode(); |
520 |
|
|
ep2->type = nextc; |
521 |
|
|
scan(); |
522 |
|
|
addekid(ep2, ep1); |
523 |
|
|
addekid(ep2, getE2()); |
524 |
greg |
2.6 |
#ifdef RCONST |
525 |
greg |
1.1 |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
526 |
|
|
ep2 = rconst(ep2); |
527 |
|
|
#endif |
528 |
|
|
ep1 = ep2; |
529 |
|
|
} |
530 |
|
|
return(ep1); |
531 |
|
|
} |
532 |
|
|
|
533 |
|
|
|
534 |
|
|
EPNODE * |
535 |
|
|
getE2() /* E2 -> E2 MULOP E3 */ |
536 |
greg |
2.6 |
/* E3 */ |
537 |
greg |
1.1 |
{ |
538 |
|
|
register EPNODE *ep1, *ep2; |
539 |
|
|
|
540 |
|
|
ep1 = getE3(); |
541 |
|
|
while (nextc == '*' || nextc == '/') { |
542 |
|
|
ep2 = newnode(); |
543 |
|
|
ep2->type = nextc; |
544 |
|
|
scan(); |
545 |
|
|
addekid(ep2, ep1); |
546 |
|
|
addekid(ep2, getE3()); |
547 |
greg |
2.6 |
#ifdef RCONST |
548 |
greg |
1.1 |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
549 |
|
|
ep2 = rconst(ep2); |
550 |
|
|
#endif |
551 |
|
|
ep1 = ep2; |
552 |
|
|
} |
553 |
|
|
return(ep1); |
554 |
|
|
} |
555 |
|
|
|
556 |
|
|
|
557 |
|
|
EPNODE * |
558 |
greg |
1.8 |
getE3() /* E3 -> E4 ^ E3 */ |
559 |
greg |
2.6 |
/* E4 */ |
560 |
greg |
1.1 |
{ |
561 |
|
|
register EPNODE *ep1, *ep2; |
562 |
|
|
|
563 |
|
|
ep1 = getE4(); |
564 |
greg |
1.8 |
if (nextc == '^') { |
565 |
greg |
1.1 |
ep2 = newnode(); |
566 |
|
|
ep2->type = nextc; |
567 |
|
|
scan(); |
568 |
|
|
addekid(ep2, ep1); |
569 |
greg |
1.8 |
addekid(ep2, getE3()); |
570 |
greg |
2.6 |
#ifdef RCONST |
571 |
greg |
1.1 |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
572 |
|
|
ep2 = rconst(ep2); |
573 |
|
|
#endif |
574 |
greg |
1.8 |
return(ep2); |
575 |
greg |
1.1 |
} |
576 |
|
|
return(ep1); |
577 |
|
|
} |
578 |
|
|
|
579 |
|
|
|
580 |
|
|
EPNODE * |
581 |
|
|
getE4() /* E4 -> ADDOP E5 */ |
582 |
greg |
2.6 |
/* E5 */ |
583 |
greg |
1.1 |
{ |
584 |
greg |
1.3 |
register EPNODE *ep1, *ep2; |
585 |
greg |
1.1 |
|
586 |
|
|
if (nextc == '-') { |
587 |
|
|
scan(); |
588 |
greg |
1.3 |
ep2 = getE5(); |
589 |
|
|
if (ep2->type == NUM) { |
590 |
|
|
ep2->v.num = -ep2->v.num; |
591 |
|
|
return(ep2); |
592 |
|
|
} |
593 |
greg |
1.16 |
if (ep2->type == UMINUS) { /* don't generate -(-E5) */ |
594 |
|
|
efree((char *)ep2); |
595 |
|
|
return(ep2->v.kid); |
596 |
|
|
} |
597 |
greg |
1.1 |
ep1 = newnode(); |
598 |
|
|
ep1->type = UMINUS; |
599 |
greg |
1.3 |
addekid(ep1, ep2); |
600 |
greg |
1.1 |
return(ep1); |
601 |
|
|
} |
602 |
|
|
if (nextc == '+') |
603 |
|
|
scan(); |
604 |
|
|
return(getE5()); |
605 |
|
|
} |
606 |
|
|
|
607 |
|
|
|
608 |
|
|
EPNODE * |
609 |
|
|
getE5() /* E5 -> (E1) */ |
610 |
greg |
2.6 |
/* VAR */ |
611 |
|
|
/* NUM */ |
612 |
|
|
/* $N */ |
613 |
|
|
/* FUNC(E1,..) */ |
614 |
|
|
/* ARG */ |
615 |
greg |
1.1 |
{ |
616 |
greg |
2.6 |
int i; |
617 |
greg |
1.14 |
char *nam; |
618 |
greg |
1.1 |
register EPNODE *ep1, *ep2; |
619 |
|
|
|
620 |
|
|
if (nextc == '(') { |
621 |
|
|
scan(); |
622 |
|
|
ep1 = getE1(); |
623 |
|
|
if (nextc != ')') |
624 |
|
|
syntax("')' expected"); |
625 |
|
|
scan(); |
626 |
|
|
return(ep1); |
627 |
|
|
} |
628 |
|
|
|
629 |
greg |
2.6 |
#ifdef INCHAN |
630 |
greg |
1.1 |
if (nextc == '$') { |
631 |
|
|
scan(); |
632 |
|
|
ep1 = newnode(); |
633 |
|
|
ep1->type = CHAN; |
634 |
|
|
ep1->v.chan = getinum(); |
635 |
|
|
return(ep1); |
636 |
|
|
} |
637 |
|
|
#endif |
638 |
|
|
|
639 |
|
|
#if defined(VARIABLE) || defined(FUNCTION) |
640 |
greg |
1.15 |
if (isalpha(nextc) || nextc == CNTXMARK) { |
641 |
greg |
1.14 |
nam = getname(); |
642 |
greg |
1.1 |
#if defined(VARIABLE) && defined(FUNCTION) |
643 |
greg |
1.14 |
ep1 = NULL; |
644 |
greg |
1.1 |
if (curfunc != NULL) |
645 |
|
|
for (i = 1, ep2 = curfunc->v.kid->sibling; |
646 |
greg |
2.6 |
ep2 != NULL; i++, ep2 = ep2->sibling) |
647 |
greg |
1.14 |
if (!strcmp(ep2->v.name, nam)) { |
648 |
greg |
1.1 |
ep1 = newnode(); |
649 |
|
|
ep1->type = ARG; |
650 |
|
|
ep1->v.chan = i; |
651 |
|
|
break; |
652 |
|
|
} |
653 |
greg |
1.14 |
if (ep1 == NULL) |
654 |
greg |
1.1 |
#endif |
655 |
greg |
1.14 |
{ |
656 |
|
|
ep1 = newnode(); |
657 |
|
|
ep1->type = VAR; |
658 |
|
|
ep1->v.ln = varinsert(nam); |
659 |
|
|
} |
660 |
greg |
2.6 |
#ifdef FUNCTION |
661 |
greg |
1.1 |
if (nextc == '(') { |
662 |
|
|
ep2 = newnode(); |
663 |
|
|
ep2->type = FUNC; |
664 |
|
|
addekid(ep2, ep1); |
665 |
|
|
ep1 = ep2; |
666 |
|
|
do { |
667 |
|
|
scan(); |
668 |
|
|
addekid(ep1, getE1()); |
669 |
|
|
} while (nextc == ','); |
670 |
|
|
if (nextc != ')') |
671 |
|
|
syntax("')' expected"); |
672 |
|
|
scan(); |
673 |
|
|
} |
674 |
greg |
2.6 |
#ifndef VARIABLE |
675 |
greg |
1.1 |
else |
676 |
|
|
syntax("'(' expected"); |
677 |
|
|
#endif |
678 |
|
|
#endif |
679 |
greg |
2.6 |
#ifdef RCONST |
680 |
greg |
1.9 |
if (isconstvar(ep1)) |
681 |
|
|
ep1 = rconst(ep1); |
682 |
|
|
#endif |
683 |
greg |
1.1 |
return(ep1); |
684 |
|
|
} |
685 |
|
|
#endif |
686 |
|
|
|
687 |
|
|
if (isdecimal(nextc)) { |
688 |
|
|
ep1 = newnode(); |
689 |
|
|
ep1->type = NUM; |
690 |
|
|
ep1->v.num = getnum(); |
691 |
|
|
return(ep1); |
692 |
|
|
} |
693 |
|
|
syntax("unexpected character"); |
694 |
|
|
} |
695 |
|
|
|
696 |
|
|
|
697 |
greg |
2.6 |
#ifdef RCONST |
698 |
greg |
1.1 |
EPNODE * |
699 |
|
|
rconst(epar) /* reduce a constant expression */ |
700 |
greg |
2.6 |
register EPNODE *epar; |
701 |
greg |
1.1 |
{ |
702 |
|
|
register EPNODE *ep; |
703 |
|
|
|
704 |
|
|
ep = newnode(); |
705 |
|
|
ep->type = NUM; |
706 |
|
|
errno = 0; |
707 |
|
|
ep->v.num = evalue(epar); |
708 |
|
|
if (errno) |
709 |
greg |
2.6 |
syntax("bad constant expression"); |
710 |
greg |
1.1 |
epfree(epar); |
711 |
|
|
|
712 |
|
|
return(ep); |
713 |
greg |
1.9 |
} |
714 |
|
|
|
715 |
|
|
|
716 |
greg |
1.11 |
isconstvar(ep) /* is ep linked to a constant expression? */ |
717 |
greg |
2.6 |
register EPNODE *ep; |
718 |
greg |
1.9 |
{ |
719 |
greg |
2.6 |
#ifdef VARIABLE |
720 |
greg |
1.9 |
register EPNODE *ep1; |
721 |
greg |
2.6 |
#ifdef FUNCTION |
722 |
greg |
1.10 |
|
723 |
greg |
1.9 |
if (ep->type == FUNC) { |
724 |
greg |
1.11 |
if (!isconstfun(ep->v.kid)) |
725 |
|
|
return(0); |
726 |
greg |
1.9 |
for (ep1 = ep->v.kid->sibling; ep1 != NULL; ep1 = ep1->sibling) |
727 |
greg |
1.11 |
if (ep1->type != NUM && !isconstfun(ep1)) |
728 |
greg |
1.9 |
return(0); |
729 |
|
|
return(1); |
730 |
|
|
} |
731 |
|
|
#endif |
732 |
|
|
if (ep->type != VAR) |
733 |
|
|
return(0); |
734 |
|
|
ep1 = ep->v.ln->def; |
735 |
|
|
if (ep1 == NULL || ep1->type != ':') |
736 |
|
|
return(0); |
737 |
greg |
2.6 |
#ifdef FUNCTION |
738 |
greg |
1.9 |
if (ep1->v.kid->type != SYM) |
739 |
|
|
return(0); |
740 |
|
|
#endif |
741 |
|
|
return(1); |
742 |
|
|
#else |
743 |
|
|
return(ep->type == FUNC); |
744 |
|
|
#endif |
745 |
greg |
1.1 |
} |
746 |
greg |
1.11 |
|
747 |
|
|
|
748 |
|
|
#if defined(FUNCTION) && defined(VARIABLE) |
749 |
|
|
isconstfun(ep) /* is ep linked to a constant function? */ |
750 |
greg |
2.6 |
register EPNODE *ep; |
751 |
greg |
1.11 |
{ |
752 |
|
|
register EPNODE *dp; |
753 |
|
|
register LIBR *lp; |
754 |
|
|
|
755 |
|
|
if (ep->type != VAR) |
756 |
|
|
return(0); |
757 |
greg |
2.3 |
if ((dp = ep->v.ln->def) != NULL && dp->v.kid->type == FUNC) |
758 |
|
|
return(dp->type == ':'); |
759 |
greg |
2.4 |
if ((lp = ep->v.ln->lib) != NULL) |
760 |
greg |
2.3 |
return(lp->atyp == ':'); |
761 |
|
|
return(0); |
762 |
greg |
1.11 |
} |
763 |
|
|
#endif |
764 |
greg |
1.1 |
#endif |