1 |
greg |
1.1 |
#ifndef lint |
2 |
greg |
2.35 |
static const char RCSid[] = "$Id: calexpr.c,v 2.34 2010/07/25 05:50:27 greg Exp $"; |
3 |
greg |
1.1 |
#endif |
4 |
|
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/* |
5 |
|
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* Compute data values using expression parser |
6 |
|
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* |
7 |
|
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* 7/1/85 Greg Ward |
8 |
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* |
9 |
|
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* 11/11/85 Made channel input conditional with (INCHAN) compiles. |
10 |
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* |
11 |
|
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* 4/2/86 Added conditional compiles for function definitions (FUNCTION). |
12 |
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* |
13 |
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* 1/29/87 Made variables conditional (VARIABLE) |
14 |
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* |
15 |
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* 5/19/88 Added constant subexpression elimination (RCONST) |
16 |
greg |
2.18 |
* |
17 |
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* 2/19/03 Eliminated conditional compiles in favor of esupport extern. |
18 |
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*/ |
19 |
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20 |
greg |
2.19 |
#include "copyright.h" |
21 |
greg |
1.1 |
|
22 |
|
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#include <stdio.h> |
23 |
schorsch |
2.22 |
#include <string.h> |
24 |
greg |
1.1 |
#include <ctype.h> |
25 |
|
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#include <errno.h> |
26 |
greg |
2.8 |
#include <math.h> |
27 |
greg |
2.18 |
#include <stdlib.h> |
28 |
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|
29 |
schorsch |
2.29 |
#include "rtmisc.h" |
30 |
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#include "rtio.h" |
31 |
schorsch |
2.24 |
#include "rterror.h" |
32 |
greg |
1.1 |
#include "calcomp.h" |
33 |
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|
34 |
greg |
2.6 |
#define MAXLINE 256 /* maximum line length */ |
35 |
greg |
1.1 |
|
36 |
greg |
2.6 |
#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
37 |
greg |
1.1 |
|
38 |
greg |
2.6 |
#define isdecimal(c) (isdigit(c) || (c) == '.') |
39 |
greg |
1.1 |
|
40 |
schorsch |
2.24 |
static double euminus(EPNODE *), eargument(EPNODE *), enumber(EPNODE *); |
41 |
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static double echannel(EPNODE *); |
42 |
|
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static double eadd(EPNODE *), esubtr(EPNODE *), |
43 |
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emult(EPNODE *), edivi(EPNODE *), |
44 |
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epow(EPNODE *); |
45 |
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static double ebotch(EPNODE *); |
46 |
greg |
1.1 |
|
47 |
greg |
2.18 |
unsigned int esupport = /* what to support */ |
48 |
greg |
2.21 |
E_VARIABLE | E_FUNCTION ; |
49 |
greg |
2.15 |
|
50 |
greg |
2.30 |
int eofc = 0; /* optional end-of-file character */ |
51 |
greg |
1.1 |
int nextc; /* lookahead character */ |
52 |
|
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|
53 |
greg |
2.27 |
double (*eoper[])(EPNODE *) = { /* expression operations */ |
54 |
greg |
1.1 |
ebotch, |
55 |
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evariable, |
56 |
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enumber, |
57 |
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euminus, |
58 |
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echannel, |
59 |
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efunc, |
60 |
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eargument, |
61 |
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ebotch, |
62 |
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ebotch, |
63 |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
64 |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
65 |
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emult, |
66 |
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eadd, |
67 |
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0, |
68 |
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esubtr, |
69 |
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0, |
70 |
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edivi, |
71 |
greg |
1.9 |
0,0,0,0,0,0,0,0,0,0, |
72 |
greg |
1.1 |
ebotch, |
73 |
greg |
1.9 |
0,0, |
74 |
|
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ebotch, |
75 |
greg |
1.1 |
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
76 |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
77 |
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epow, |
78 |
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}; |
79 |
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|
80 |
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static FILE *infp; /* input file pointer */ |
81 |
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static char *linbuf; /* line buffer */ |
82 |
greg |
1.6 |
static char *infile; /* input file name */ |
83 |
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static int lineno; /* input line number */ |
84 |
greg |
1.1 |
static int linepos; /* position in buffer */ |
85 |
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86 |
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87 |
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EPNODE * |
88 |
schorsch |
2.28 |
eparse( /* parse an expression string */ |
89 |
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char *expr |
90 |
|
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) |
91 |
greg |
1.1 |
{ |
92 |
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EPNODE *ep; |
93 |
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|
94 |
greg |
1.6 |
initstr(expr, NULL, 0); |
95 |
greg |
1.1 |
curfunc = NULL; |
96 |
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ep = getE1(); |
97 |
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if (nextc != EOF) |
98 |
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syntax("unexpected character"); |
99 |
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return(ep); |
100 |
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} |
101 |
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102 |
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103 |
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double |
104 |
schorsch |
2.28 |
eval( /* evaluate an expression string */ |
105 |
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char *expr |
106 |
|
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) |
107 |
greg |
1.1 |
{ |
108 |
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register EPNODE *ep; |
109 |
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double rval; |
110 |
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111 |
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ep = eparse(expr); |
112 |
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rval = evalue(ep); |
113 |
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epfree(ep); |
114 |
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return(rval); |
115 |
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} |
116 |
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|
117 |
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|
118 |
greg |
2.18 |
int |
119 |
schorsch |
2.28 |
epcmp( /* compare two expressions for equivalence */ |
120 |
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register EPNODE *ep1, |
121 |
|
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register EPNODE *ep2 |
122 |
|
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) |
123 |
greg |
2.16 |
{ |
124 |
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double d; |
125 |
|
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|
126 |
|
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if (ep1->type != ep2->type) |
127 |
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return(1); |
128 |
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129 |
|
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switch (ep1->type) { |
130 |
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131 |
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case VAR: |
132 |
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return(ep1->v.ln != ep2->v.ln); |
133 |
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134 |
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case NUM: |
135 |
|
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if (ep2->v.num == 0) |
136 |
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return(ep1->v.num != 0); |
137 |
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d = ep1->v.num / ep2->v.num; |
138 |
schorsch |
2.26 |
return((d > 1.000000000001) | (d < 0.999999999999)); |
139 |
greg |
2.16 |
|
140 |
|
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case CHAN: |
141 |
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case ARG: |
142 |
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return(ep1->v.chan != ep2->v.chan); |
143 |
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144 |
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case '=': |
145 |
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case ':': |
146 |
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return(epcmp(ep1->v.kid->sibling, ep2->v.kid->sibling)); |
147 |
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|
148 |
greg |
2.32 |
case CLKT: |
149 |
greg |
2.16 |
case SYM: /* should never get this one */ |
150 |
|
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return(0); |
151 |
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|
152 |
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default: |
153 |
|
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ep1 = ep1->v.kid; |
154 |
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ep2 = ep2->v.kid; |
155 |
|
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while (ep1 != NULL) { |
156 |
|
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if (ep2 == NULL) |
157 |
|
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return(1); |
158 |
|
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if (epcmp(ep1, ep2)) |
159 |
|
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return(1); |
160 |
|
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ep1 = ep1->sibling; |
161 |
|
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ep2 = ep2->sibling; |
162 |
|
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} |
163 |
|
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return(ep2 != NULL); |
164 |
|
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} |
165 |
|
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} |
166 |
|
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|
167 |
|
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|
168 |
greg |
2.18 |
void |
169 |
schorsch |
2.28 |
epfree( /* free a parse tree */ |
170 |
|
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register EPNODE *epar |
171 |
|
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) |
172 |
greg |
1.1 |
{ |
173 |
greg |
2.11 |
register EPNODE *ep; |
174 |
greg |
1.1 |
|
175 |
|
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switch (epar->type) { |
176 |
|
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|
177 |
|
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case VAR: |
178 |
|
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varfree(epar->v.ln); |
179 |
|
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break; |
180 |
|
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|
181 |
|
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case SYM: |
182 |
|
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freestr(epar->v.name); |
183 |
|
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break; |
184 |
|
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|
185 |
|
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case NUM: |
186 |
|
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case CHAN: |
187 |
|
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case ARG: |
188 |
greg |
2.32 |
case CLKT: |
189 |
greg |
1.1 |
break; |
190 |
|
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|
191 |
|
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default: |
192 |
greg |
2.11 |
while ((ep = epar->v.kid) != NULL) { |
193 |
|
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epar->v.kid = ep->sibling; |
194 |
greg |
1.1 |
epfree(ep); |
195 |
greg |
2.10 |
} |
196 |
greg |
1.1 |
break; |
197 |
|
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|
198 |
|
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} |
199 |
|
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|
200 |
|
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efree((char *)epar); |
201 |
|
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} |
202 |
|
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|
203 |
|
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/* the following used to be a switch */ |
204 |
|
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static double |
205 |
schorsch |
2.28 |
eargument( |
206 |
|
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EPNODE *ep |
207 |
|
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) |
208 |
greg |
1.1 |
{ |
209 |
|
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return(argument(ep->v.chan)); |
210 |
|
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} |
211 |
|
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|
212 |
|
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static double |
213 |
schorsch |
2.28 |
enumber( |
214 |
|
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EPNODE *ep |
215 |
|
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) |
216 |
greg |
1.1 |
{ |
217 |
|
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return(ep->v.num); |
218 |
|
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} |
219 |
|
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|
220 |
|
|
static double |
221 |
schorsch |
2.28 |
euminus( |
222 |
|
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EPNODE *ep |
223 |
|
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) |
224 |
greg |
1.1 |
{ |
225 |
|
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register EPNODE *ep1 = ep->v.kid; |
226 |
|
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|
227 |
|
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return(-evalue(ep1)); |
228 |
|
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} |
229 |
|
|
|
230 |
|
|
static double |
231 |
schorsch |
2.28 |
echannel( |
232 |
|
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EPNODE *ep |
233 |
|
|
) |
234 |
greg |
1.1 |
{ |
235 |
|
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return(chanvalue(ep->v.chan)); |
236 |
|
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} |
237 |
|
|
|
238 |
|
|
static double |
239 |
schorsch |
2.28 |
eadd( |
240 |
|
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EPNODE *ep |
241 |
|
|
) |
242 |
greg |
1.1 |
{ |
243 |
|
|
register EPNODE *ep1 = ep->v.kid; |
244 |
|
|
|
245 |
|
|
return(evalue(ep1) + evalue(ep1->sibling)); |
246 |
|
|
} |
247 |
|
|
|
248 |
|
|
static double |
249 |
schorsch |
2.28 |
esubtr( |
250 |
|
|
EPNODE *ep |
251 |
|
|
) |
252 |
greg |
1.1 |
{ |
253 |
|
|
register EPNODE *ep1 = ep->v.kid; |
254 |
|
|
|
255 |
|
|
return(evalue(ep1) - evalue(ep1->sibling)); |
256 |
|
|
} |
257 |
|
|
|
258 |
|
|
static double |
259 |
schorsch |
2.28 |
emult( |
260 |
|
|
EPNODE *ep |
261 |
|
|
) |
262 |
greg |
1.1 |
{ |
263 |
|
|
register EPNODE *ep1 = ep->v.kid; |
264 |
|
|
|
265 |
|
|
return(evalue(ep1) * evalue(ep1->sibling)); |
266 |
|
|
} |
267 |
|
|
|
268 |
|
|
static double |
269 |
schorsch |
2.28 |
edivi( |
270 |
|
|
EPNODE *ep |
271 |
|
|
) |
272 |
greg |
1.1 |
{ |
273 |
|
|
register EPNODE *ep1 = ep->v.kid; |
274 |
|
|
double d; |
275 |
|
|
|
276 |
|
|
d = evalue(ep1->sibling); |
277 |
|
|
if (d == 0.0) { |
278 |
|
|
wputs("Division by zero\n"); |
279 |
|
|
errno = ERANGE; |
280 |
|
|
return(0.0); |
281 |
|
|
} |
282 |
|
|
return(evalue(ep1) / d); |
283 |
|
|
} |
284 |
|
|
|
285 |
|
|
static double |
286 |
schorsch |
2.28 |
epow( |
287 |
|
|
EPNODE *ep |
288 |
|
|
) |
289 |
greg |
1.1 |
{ |
290 |
|
|
register EPNODE *ep1 = ep->v.kid; |
291 |
|
|
double d; |
292 |
greg |
2.6 |
int lasterrno; |
293 |
greg |
1.1 |
|
294 |
|
|
lasterrno = errno; |
295 |
|
|
errno = 0; |
296 |
|
|
d = pow(evalue(ep1), evalue(ep1->sibling)); |
297 |
greg |
2.31 |
#ifdef isnan |
298 |
|
|
if (errno == 0) |
299 |
|
|
if (isnan(d)) |
300 |
|
|
errno = EDOM; |
301 |
|
|
else if (isinf(d)) |
302 |
|
|
errno = ERANGE; |
303 |
greg |
1.1 |
#endif |
304 |
greg |
2.20 |
if (errno == EDOM || errno == ERANGE) { |
305 |
greg |
1.1 |
wputs("Illegal power\n"); |
306 |
|
|
return(0.0); |
307 |
|
|
} |
308 |
|
|
errno = lasterrno; |
309 |
|
|
return(d); |
310 |
|
|
} |
311 |
|
|
|
312 |
|
|
static double |
313 |
schorsch |
2.28 |
ebotch( |
314 |
|
|
EPNODE *ep |
315 |
|
|
) |
316 |
greg |
1.1 |
{ |
317 |
|
|
eputs("Bad expression!\n"); |
318 |
|
|
quit(1); |
319 |
schorsch |
2.22 |
return 0.0; /* pro forma return */ |
320 |
greg |
1.1 |
} |
321 |
|
|
|
322 |
|
|
|
323 |
|
|
EPNODE * |
324 |
schorsch |
2.28 |
ekid( /* return pointer to a node's nth kid */ |
325 |
|
|
register EPNODE *ep, |
326 |
|
|
register int n |
327 |
|
|
) |
328 |
greg |
1.1 |
{ |
329 |
|
|
|
330 |
|
|
for (ep = ep->v.kid; ep != NULL; ep = ep->sibling) |
331 |
|
|
if (--n < 0) |
332 |
|
|
break; |
333 |
|
|
|
334 |
|
|
return(ep); |
335 |
|
|
} |
336 |
|
|
|
337 |
|
|
|
338 |
|
|
int |
339 |
schorsch |
2.28 |
nekids( /* return # of kids for node ep */ |
340 |
|
|
register EPNODE *ep |
341 |
|
|
) |
342 |
greg |
1.1 |
{ |
343 |
|
|
register int n = 0; |
344 |
|
|
|
345 |
|
|
for (ep = ep->v.kid; ep != NULL; ep = ep->sibling) |
346 |
|
|
n++; |
347 |
|
|
|
348 |
|
|
return(n); |
349 |
|
|
} |
350 |
|
|
|
351 |
|
|
|
352 |
greg |
2.18 |
void |
353 |
schorsch |
2.28 |
initfile( /* prepare input file */ |
354 |
|
|
FILE *fp, |
355 |
|
|
char *fn, |
356 |
|
|
int ln |
357 |
|
|
) |
358 |
greg |
1.1 |
{ |
359 |
greg |
2.6 |
static char inpbuf[MAXLINE]; |
360 |
greg |
1.1 |
|
361 |
|
|
infp = fp; |
362 |
|
|
linbuf = inpbuf; |
363 |
greg |
1.6 |
infile = fn; |
364 |
|
|
lineno = ln; |
365 |
greg |
1.1 |
linepos = 0; |
366 |
|
|
inpbuf[0] = '\0'; |
367 |
|
|
scan(); |
368 |
|
|
} |
369 |
|
|
|
370 |
|
|
|
371 |
greg |
2.18 |
void |
372 |
schorsch |
2.28 |
initstr( /* prepare input string */ |
373 |
|
|
char *s, |
374 |
|
|
char *fn, |
375 |
|
|
int ln |
376 |
|
|
) |
377 |
greg |
1.1 |
{ |
378 |
|
|
infp = NULL; |
379 |
greg |
1.6 |
infile = fn; |
380 |
|
|
lineno = ln; |
381 |
greg |
1.1 |
linbuf = s; |
382 |
|
|
linepos = 0; |
383 |
|
|
scan(); |
384 |
|
|
} |
385 |
|
|
|
386 |
|
|
|
387 |
greg |
2.18 |
void |
388 |
schorsch |
2.28 |
getscanpos( /* return current scan position */ |
389 |
|
|
char **fnp, |
390 |
|
|
int *lnp, |
391 |
|
|
char **spp, |
392 |
|
|
FILE **fpp |
393 |
|
|
) |
394 |
greg |
1.13 |
{ |
395 |
|
|
if (fnp != NULL) *fnp = infile; |
396 |
|
|
if (lnp != NULL) *lnp = lineno; |
397 |
|
|
if (spp != NULL) *spp = linbuf+linepos; |
398 |
|
|
if (fpp != NULL) *fpp = infp; |
399 |
|
|
} |
400 |
|
|
|
401 |
|
|
|
402 |
greg |
1.12 |
int |
403 |
schorsch |
2.28 |
scan(void) /* scan next character, return literal next */ |
404 |
greg |
1.1 |
{ |
405 |
greg |
1.12 |
register int lnext = 0; |
406 |
|
|
|
407 |
greg |
1.1 |
do { |
408 |
|
|
if (linbuf[linepos] == '\0') |
409 |
|
|
if (infp == NULL || fgets(linbuf, MAXLINE, infp) == NULL) |
410 |
|
|
nextc = EOF; |
411 |
|
|
else { |
412 |
|
|
nextc = linbuf[0]; |
413 |
greg |
1.6 |
lineno++; |
414 |
greg |
1.1 |
linepos = 1; |
415 |
|
|
} |
416 |
|
|
else |
417 |
|
|
nextc = linbuf[linepos++]; |
418 |
greg |
1.12 |
if (!lnext) |
419 |
|
|
lnext = nextc; |
420 |
greg |
2.30 |
if (nextc == eofc) { |
421 |
|
|
nextc = EOF; |
422 |
|
|
break; |
423 |
|
|
} |
424 |
greg |
1.1 |
if (nextc == '{') { |
425 |
|
|
scan(); |
426 |
|
|
while (nextc != '}') |
427 |
|
|
if (nextc == EOF) |
428 |
|
|
syntax("'}' expected"); |
429 |
|
|
else |
430 |
|
|
scan(); |
431 |
|
|
scan(); |
432 |
|
|
} |
433 |
|
|
} while (isspace(nextc)); |
434 |
greg |
1.12 |
return(lnext); |
435 |
greg |
1.1 |
} |
436 |
|
|
|
437 |
|
|
|
438 |
greg |
1.6 |
char * |
439 |
schorsch |
2.28 |
long2ascii( /* convert long to ascii */ |
440 |
|
|
long l |
441 |
|
|
) |
442 |
greg |
1.6 |
{ |
443 |
greg |
2.6 |
static char buf[16]; |
444 |
greg |
1.6 |
register char *cp; |
445 |
greg |
2.6 |
int neg = 0; |
446 |
greg |
1.6 |
|
447 |
|
|
if (l == 0) |
448 |
|
|
return("0"); |
449 |
|
|
if (l < 0) { |
450 |
|
|
l = -l; |
451 |
|
|
neg++; |
452 |
|
|
} |
453 |
|
|
cp = buf + sizeof(buf); |
454 |
|
|
*--cp = '\0'; |
455 |
|
|
while (l) { |
456 |
|
|
*--cp = l % 10 + '0'; |
457 |
|
|
l /= 10; |
458 |
|
|
} |
459 |
|
|
if (neg) |
460 |
|
|
*--cp = '-'; |
461 |
|
|
return(cp); |
462 |
|
|
} |
463 |
|
|
|
464 |
|
|
|
465 |
greg |
2.18 |
void |
466 |
schorsch |
2.28 |
syntax( /* report syntax error and quit */ |
467 |
|
|
char *err |
468 |
|
|
) |
469 |
greg |
1.1 |
{ |
470 |
|
|
register int i; |
471 |
|
|
|
472 |
greg |
1.6 |
if (infile != NULL || lineno != 0) { |
473 |
|
|
if (infile != NULL) eputs(infile); |
474 |
|
|
if (lineno != 0) { |
475 |
|
|
eputs(infile != NULL ? ", line " : "line "); |
476 |
greg |
2.9 |
eputs(long2ascii((long)lineno)); |
477 |
greg |
1.6 |
} |
478 |
greg |
2.7 |
eputs(":\n"); |
479 |
greg |
1.1 |
} |
480 |
greg |
1.7 |
eputs(linbuf); |
481 |
|
|
if (linbuf[strlen(linbuf)-1] != '\n') |
482 |
|
|
eputs("\n"); |
483 |
|
|
for (i = 0; i < linepos-1; i++) |
484 |
|
|
eputs(linbuf[i] == '\t' ? "\t" : " "); |
485 |
|
|
eputs("^ "); |
486 |
greg |
1.1 |
eputs(err); |
487 |
|
|
eputs("\n"); |
488 |
|
|
quit(1); |
489 |
|
|
} |
490 |
|
|
|
491 |
|
|
|
492 |
greg |
2.18 |
void |
493 |
schorsch |
2.28 |
addekid( /* add a child to ep */ |
494 |
|
|
register EPNODE *ep, |
495 |
|
|
EPNODE *ekid |
496 |
|
|
) |
497 |
greg |
1.1 |
{ |
498 |
|
|
if (ep->v.kid == NULL) |
499 |
|
|
ep->v.kid = ekid; |
500 |
|
|
else { |
501 |
|
|
for (ep = ep->v.kid; ep->sibling != NULL; ep = ep->sibling) |
502 |
|
|
; |
503 |
|
|
ep->sibling = ekid; |
504 |
|
|
} |
505 |
|
|
ekid->sibling = NULL; |
506 |
|
|
} |
507 |
|
|
|
508 |
|
|
|
509 |
|
|
char * |
510 |
schorsch |
2.28 |
getname(void) /* scan an identifier */ |
511 |
greg |
1.1 |
{ |
512 |
schorsch |
2.23 |
static char str[RMAXWORD+1]; |
513 |
greg |
1.12 |
register int i, lnext; |
514 |
greg |
1.1 |
|
515 |
greg |
1.12 |
lnext = nextc; |
516 |
schorsch |
2.23 |
for (i = 0; i < RMAXWORD && isid(lnext); i++, lnext = scan()) |
517 |
greg |
1.12 |
str[i] = lnext; |
518 |
greg |
1.1 |
str[i] = '\0'; |
519 |
greg |
1.15 |
while (isid(lnext)) /* skip rest of name */ |
520 |
|
|
lnext = scan(); |
521 |
greg |
1.1 |
|
522 |
|
|
return(str); |
523 |
|
|
} |
524 |
|
|
|
525 |
|
|
|
526 |
|
|
int |
527 |
schorsch |
2.28 |
getinum(void) /* scan a positive integer */ |
528 |
greg |
1.1 |
{ |
529 |
greg |
1.12 |
register int n, lnext; |
530 |
greg |
1.1 |
|
531 |
|
|
n = 0; |
532 |
greg |
1.12 |
lnext = nextc; |
533 |
|
|
while (isdigit(lnext)) { |
534 |
|
|
n = n * 10 + lnext - '0'; |
535 |
|
|
lnext = scan(); |
536 |
greg |
1.1 |
} |
537 |
|
|
return(n); |
538 |
|
|
} |
539 |
|
|
|
540 |
|
|
|
541 |
|
|
double |
542 |
schorsch |
2.28 |
getnum(void) /* scan a positive float */ |
543 |
greg |
1.1 |
{ |
544 |
greg |
1.12 |
register int i, lnext; |
545 |
schorsch |
2.23 |
char str[RMAXWORD+1]; |
546 |
greg |
1.1 |
|
547 |
|
|
i = 0; |
548 |
greg |
1.12 |
lnext = nextc; |
549 |
schorsch |
2.23 |
while (isdigit(lnext) && i < RMAXWORD) { |
550 |
greg |
1.12 |
str[i++] = lnext; |
551 |
|
|
lnext = scan(); |
552 |
greg |
1.1 |
} |
553 |
schorsch |
2.23 |
if (lnext == '.' && i < RMAXWORD) { |
554 |
greg |
2.6 |
str[i++] = lnext; |
555 |
|
|
lnext = scan(); |
556 |
gwlarson |
2.17 |
if (i == 1 && !isdigit(lnext)) |
557 |
|
|
syntax("badly formed number"); |
558 |
schorsch |
2.23 |
while (isdigit(lnext) && i < RMAXWORD) { |
559 |
greg |
1.12 |
str[i++] = lnext; |
560 |
|
|
lnext = scan(); |
561 |
greg |
1.1 |
} |
562 |
|
|
} |
563 |
schorsch |
2.26 |
if ((lnext == 'e') | (lnext == 'E') && i < RMAXWORD) { |
564 |
greg |
2.6 |
str[i++] = lnext; |
565 |
|
|
lnext = scan(); |
566 |
schorsch |
2.26 |
if ((lnext == '-') | (lnext == '+') && i < RMAXWORD) { |
567 |
greg |
1.12 |
str[i++] = lnext; |
568 |
|
|
lnext = scan(); |
569 |
greg |
1.1 |
} |
570 |
gwlarson |
2.17 |
if (!isdigit(lnext)) |
571 |
|
|
syntax("missing exponent"); |
572 |
schorsch |
2.23 |
while (isdigit(lnext) && i < RMAXWORD) { |
573 |
greg |
1.12 |
str[i++] = lnext; |
574 |
|
|
lnext = scan(); |
575 |
greg |
1.1 |
} |
576 |
|
|
} |
577 |
|
|
str[i] = '\0'; |
578 |
|
|
|
579 |
|
|
return(atof(str)); |
580 |
|
|
} |
581 |
|
|
|
582 |
|
|
|
583 |
|
|
EPNODE * |
584 |
greg |
2.34 |
getE1(void) /* E1 -> E1 ADDOP E2 */ |
585 |
greg |
2.6 |
/* E2 */ |
586 |
greg |
1.1 |
{ |
587 |
|
|
register EPNODE *ep1, *ep2; |
588 |
|
|
|
589 |
|
|
ep1 = getE2(); |
590 |
|
|
while (nextc == '+' || nextc == '-') { |
591 |
|
|
ep2 = newnode(); |
592 |
|
|
ep2->type = nextc; |
593 |
|
|
scan(); |
594 |
|
|
addekid(ep2, ep1); |
595 |
|
|
addekid(ep2, getE2()); |
596 |
greg |
2.18 |
if (esupport&E_RCONST && |
597 |
|
|
ep1->type == NUM && ep1->sibling->type == NUM) |
598 |
greg |
1.1 |
ep2 = rconst(ep2); |
599 |
|
|
ep1 = ep2; |
600 |
|
|
} |
601 |
|
|
return(ep1); |
602 |
|
|
} |
603 |
|
|
|
604 |
|
|
|
605 |
|
|
EPNODE * |
606 |
greg |
2.34 |
getE2(void) /* E2 -> E2 MULOP E3 */ |
607 |
greg |
2.6 |
/* E3 */ |
608 |
greg |
1.1 |
{ |
609 |
|
|
register EPNODE *ep1, *ep2; |
610 |
|
|
|
611 |
|
|
ep1 = getE3(); |
612 |
|
|
while (nextc == '*' || nextc == '/') { |
613 |
|
|
ep2 = newnode(); |
614 |
|
|
ep2->type = nextc; |
615 |
|
|
scan(); |
616 |
|
|
addekid(ep2, ep1); |
617 |
|
|
addekid(ep2, getE3()); |
618 |
greg |
2.34 |
if (esupport&E_RCONST) { |
619 |
|
|
EPNODE *ep3 = ep1->sibling; |
620 |
|
|
if (ep1->type == NUM && ep3->type == NUM) { |
621 |
|
|
ep2 = rconst(ep2); |
622 |
greg |
2.35 |
} else if (ep3->type == NUM) { |
623 |
|
|
if (ep2->type == '/') { |
624 |
|
|
if (ep3->v.num == 0) |
625 |
|
|
syntax("divide by zero constant"); |
626 |
|
|
ep2->type = '*'; /* for speed */ |
627 |
|
|
ep3->v.num = 1./ep3->v.num; |
628 |
|
|
} else if (ep3->v.num == 0) { |
629 |
|
|
ep1->sibling = NULL; /* (E2 * 0) */ |
630 |
|
|
epfree(ep2); |
631 |
|
|
ep2 = ep3; |
632 |
|
|
} |
633 |
greg |
2.34 |
} else if (ep1->type == NUM && ep1->v.num == 0) { |
634 |
|
|
epfree(ep3); /* (0 * E3) or (0 / E3) */ |
635 |
|
|
ep1->sibling = NULL; |
636 |
|
|
efree((char *)ep2); |
637 |
|
|
ep2 = ep1; |
638 |
|
|
} |
639 |
|
|
} |
640 |
greg |
1.1 |
ep1 = ep2; |
641 |
|
|
} |
642 |
|
|
return(ep1); |
643 |
|
|
} |
644 |
|
|
|
645 |
|
|
|
646 |
|
|
EPNODE * |
647 |
greg |
2.34 |
getE3(void) /* E3 -> E4 ^ E3 */ |
648 |
greg |
2.6 |
/* E4 */ |
649 |
greg |
1.1 |
{ |
650 |
greg |
2.34 |
register EPNODE *ep1, *ep2; |
651 |
greg |
1.1 |
|
652 |
greg |
2.34 |
ep1 = getE4(); |
653 |
|
|
if (nextc != '^') |
654 |
|
|
return(ep1); |
655 |
greg |
1.1 |
ep2 = newnode(); |
656 |
|
|
ep2->type = nextc; |
657 |
|
|
scan(); |
658 |
|
|
addekid(ep2, ep1); |
659 |
greg |
1.8 |
addekid(ep2, getE3()); |
660 |
greg |
2.34 |
if (esupport&E_RCONST) { |
661 |
|
|
EPNODE *ep3 = ep1->sibling; |
662 |
|
|
if (ep1->type == NUM && ep3->type == NUM) { |
663 |
|
|
ep2 = rconst(ep2); |
664 |
|
|
} else if (ep1->type == NUM && ep1->v.num == 0) { |
665 |
|
|
epfree(ep3); /* (0 ^ E3) */ |
666 |
|
|
ep1->sibling = NULL; |
667 |
|
|
efree((char *)ep2); |
668 |
|
|
ep2 = ep1; |
669 |
|
|
} else if ((ep3->type == NUM && ep3->v.num == 0) || |
670 |
|
|
(ep1->type == NUM && ep1->v.num == 1)) { |
671 |
|
|
epfree(ep2); /* (E4 ^ 0) or (1 ^ E3) */ |
672 |
|
|
ep2 = newnode(); |
673 |
|
|
ep2->type = NUM; |
674 |
|
|
ep2->v.num = 1; |
675 |
|
|
} |
676 |
|
|
} |
677 |
greg |
1.8 |
return(ep2); |
678 |
greg |
1.1 |
} |
679 |
|
|
|
680 |
|
|
|
681 |
|
|
EPNODE * |
682 |
greg |
2.34 |
getE4(void) /* E4 -> ADDOP E5 */ |
683 |
greg |
2.6 |
/* E5 */ |
684 |
greg |
1.1 |
{ |
685 |
greg |
1.3 |
register EPNODE *ep1, *ep2; |
686 |
greg |
1.1 |
|
687 |
|
|
if (nextc == '-') { |
688 |
|
|
scan(); |
689 |
greg |
1.3 |
ep2 = getE5(); |
690 |
|
|
if (ep2->type == NUM) { |
691 |
|
|
ep2->v.num = -ep2->v.num; |
692 |
|
|
return(ep2); |
693 |
|
|
} |
694 |
greg |
1.16 |
if (ep2->type == UMINUS) { /* don't generate -(-E5) */ |
695 |
greg |
2.33 |
ep1 = ep2->v.kid; |
696 |
greg |
1.16 |
efree((char *)ep2); |
697 |
greg |
2.33 |
return(ep1); |
698 |
greg |
1.16 |
} |
699 |
greg |
1.1 |
ep1 = newnode(); |
700 |
|
|
ep1->type = UMINUS; |
701 |
greg |
1.3 |
addekid(ep1, ep2); |
702 |
greg |
1.1 |
return(ep1); |
703 |
|
|
} |
704 |
|
|
if (nextc == '+') |
705 |
|
|
scan(); |
706 |
|
|
return(getE5()); |
707 |
|
|
} |
708 |
|
|
|
709 |
|
|
|
710 |
|
|
EPNODE * |
711 |
schorsch |
2.28 |
getE5(void) /* E5 -> (E1) */ |
712 |
greg |
2.6 |
/* VAR */ |
713 |
|
|
/* NUM */ |
714 |
|
|
/* $N */ |
715 |
|
|
/* FUNC(E1,..) */ |
716 |
|
|
/* ARG */ |
717 |
greg |
1.1 |
{ |
718 |
schorsch |
2.22 |
int i; |
719 |
|
|
char *nam; |
720 |
|
|
register EPNODE *ep1, *ep2; |
721 |
greg |
1.1 |
|
722 |
schorsch |
2.22 |
if (nextc == '(') { |
723 |
|
|
scan(); |
724 |
|
|
ep1 = getE1(); |
725 |
|
|
if (nextc != ')') |
726 |
|
|
syntax("')' expected"); |
727 |
|
|
scan(); |
728 |
|
|
return(ep1); |
729 |
|
|
} |
730 |
greg |
1.1 |
|
731 |
schorsch |
2.22 |
if (esupport&E_INCHAN && nextc == '$') { |
732 |
|
|
scan(); |
733 |
|
|
ep1 = newnode(); |
734 |
|
|
ep1->type = CHAN; |
735 |
|
|
ep1->v.chan = getinum(); |
736 |
|
|
return(ep1); |
737 |
|
|
} |
738 |
greg |
1.1 |
|
739 |
schorsch |
2.22 |
if (esupport&(E_VARIABLE|E_FUNCTION) && |
740 |
|
|
(isalpha(nextc) || nextc == CNTXMARK)) { |
741 |
|
|
nam = getname(); |
742 |
|
|
ep1 = NULL; |
743 |
|
|
if ((esupport&(E_VARIABLE|E_FUNCTION)) == (E_VARIABLE|E_FUNCTION) |
744 |
|
|
&& curfunc != NULL) |
745 |
|
|
for (i = 1, ep2 = curfunc->v.kid->sibling; |
746 |
|
|
ep2 != NULL; i++, ep2 = ep2->sibling) |
747 |
|
|
if (!strcmp(ep2->v.name, nam)) { |
748 |
|
|
ep1 = newnode(); |
749 |
|
|
ep1->type = ARG; |
750 |
|
|
ep1->v.chan = i; |
751 |
|
|
break; |
752 |
|
|
} |
753 |
|
|
if (ep1 == NULL) { |
754 |
|
|
ep1 = newnode(); |
755 |
|
|
ep1->type = VAR; |
756 |
|
|
ep1->v.ln = varinsert(nam); |
757 |
greg |
1.1 |
} |
758 |
schorsch |
2.22 |
if (esupport&E_FUNCTION && nextc == '(') { |
759 |
|
|
ep2 = newnode(); |
760 |
|
|
ep2->type = FUNC; |
761 |
|
|
addekid(ep2, ep1); |
762 |
|
|
ep1 = ep2; |
763 |
|
|
do { |
764 |
|
|
scan(); |
765 |
|
|
addekid(ep1, getE1()); |
766 |
|
|
} while (nextc == ','); |
767 |
|
|
if (nextc != ')') |
768 |
|
|
syntax("')' expected"); |
769 |
|
|
scan(); |
770 |
|
|
} else if (!(esupport&E_VARIABLE)) |
771 |
|
|
syntax("'(' expected"); |
772 |
|
|
if (esupport&E_RCONST && isconstvar(ep1)) |
773 |
|
|
ep1 = rconst(ep1); |
774 |
|
|
return(ep1); |
775 |
|
|
} |
776 |
greg |
1.1 |
|
777 |
schorsch |
2.22 |
if (isdecimal(nextc)) { |
778 |
|
|
ep1 = newnode(); |
779 |
|
|
ep1->type = NUM; |
780 |
|
|
ep1->v.num = getnum(); |
781 |
|
|
return(ep1); |
782 |
|
|
} |
783 |
|
|
syntax("unexpected character"); |
784 |
|
|
return NULL; /* pro forma return */ |
785 |
greg |
1.1 |
} |
786 |
|
|
|
787 |
|
|
|
788 |
|
|
EPNODE * |
789 |
schorsch |
2.28 |
rconst( /* reduce a constant expression */ |
790 |
|
|
register EPNODE *epar |
791 |
|
|
) |
792 |
greg |
1.1 |
{ |
793 |
|
|
register EPNODE *ep; |
794 |
|
|
|
795 |
|
|
ep = newnode(); |
796 |
|
|
ep->type = NUM; |
797 |
|
|
errno = 0; |
798 |
|
|
ep->v.num = evalue(epar); |
799 |
greg |
2.20 |
if (errno == EDOM || errno == ERANGE) |
800 |
greg |
2.6 |
syntax("bad constant expression"); |
801 |
greg |
1.1 |
epfree(epar); |
802 |
|
|
|
803 |
|
|
return(ep); |
804 |
greg |
1.9 |
} |
805 |
|
|
|
806 |
|
|
|
807 |
greg |
2.18 |
int |
808 |
schorsch |
2.28 |
isconstvar( /* is ep linked to a constant expression? */ |
809 |
|
|
register EPNODE *ep |
810 |
|
|
) |
811 |
greg |
1.9 |
{ |
812 |
|
|
register EPNODE *ep1; |
813 |
greg |
1.10 |
|
814 |
greg |
2.18 |
if (esupport&E_FUNCTION && ep->type == FUNC) { |
815 |
greg |
1.11 |
if (!isconstfun(ep->v.kid)) |
816 |
|
|
return(0); |
817 |
greg |
1.9 |
for (ep1 = ep->v.kid->sibling; ep1 != NULL; ep1 = ep1->sibling) |
818 |
greg |
1.11 |
if (ep1->type != NUM && !isconstfun(ep1)) |
819 |
greg |
1.9 |
return(0); |
820 |
|
|
return(1); |
821 |
|
|
} |
822 |
|
|
if (ep->type != VAR) |
823 |
|
|
return(0); |
824 |
|
|
ep1 = ep->v.ln->def; |
825 |
|
|
if (ep1 == NULL || ep1->type != ':') |
826 |
|
|
return(0); |
827 |
greg |
2.18 |
if (esupport&E_FUNCTION && ep1->v.kid->type != SYM) |
828 |
greg |
1.9 |
return(0); |
829 |
|
|
return(1); |
830 |
greg |
1.1 |
} |
831 |
greg |
1.11 |
|
832 |
|
|
|
833 |
greg |
2.18 |
int |
834 |
schorsch |
2.28 |
isconstfun( /* is ep linked to a constant function? */ |
835 |
|
|
register EPNODE *ep |
836 |
|
|
) |
837 |
greg |
1.11 |
{ |
838 |
|
|
register EPNODE *dp; |
839 |
|
|
register LIBR *lp; |
840 |
|
|
|
841 |
|
|
if (ep->type != VAR) |
842 |
|
|
return(0); |
843 |
schorsch |
2.25 |
if ((dp = ep->v.ln->def) != NULL) { |
844 |
greg |
2.18 |
if (dp->v.kid->type == FUNC) |
845 |
|
|
return(dp->type == ':'); |
846 |
|
|
else |
847 |
|
|
return(0); /* don't identify masked library functions */ |
848 |
schorsch |
2.25 |
} |
849 |
greg |
2.4 |
if ((lp = ep->v.ln->lib) != NULL) |
850 |
greg |
2.3 |
return(lp->atyp == ':'); |
851 |
|
|
return(0); |
852 |
greg |
1.11 |
} |