1 |
greg |
1.1 |
#ifndef lint |
2 |
|
|
static const char RCSid[] = "$Id$"; |
3 |
|
|
#endif |
4 |
|
|
/* |
5 |
|
|
* calc.c - simple algebraic desk calculator program. |
6 |
|
|
* |
7 |
|
|
* 4/1/86 |
8 |
|
|
*/ |
9 |
|
|
|
10 |
|
|
#include <stdio.h> |
11 |
|
|
|
12 |
|
|
#include <setjmp.h> |
13 |
|
|
|
14 |
|
|
#include <ctype.h> |
15 |
|
|
|
16 |
|
|
#include "calcomp.h" |
17 |
|
|
|
18 |
|
|
|
19 |
|
|
#define MAXRES 100 |
20 |
|
|
|
21 |
|
|
double result[MAXRES]; |
22 |
|
|
int nres = 0; |
23 |
|
|
|
24 |
|
|
#ifndef BSD |
25 |
|
|
#define index strchr |
26 |
|
|
#endif |
27 |
|
|
extern char *index(), *fgets(); |
28 |
|
|
|
29 |
|
|
|
30 |
|
|
jmp_buf env; |
31 |
|
|
int recover = 0; |
32 |
|
|
|
33 |
|
|
|
34 |
|
|
main(argc, argv) |
35 |
|
|
int argc; |
36 |
|
|
char *argv[]; |
37 |
|
|
{ |
38 |
|
|
char expr[512]; |
39 |
|
|
FILE *fp; |
40 |
|
|
int i; |
41 |
|
|
register char *cp; |
42 |
|
|
|
43 |
|
|
esupport |= E_VARIABLE|E_INCHAN|E_FUNCTION; |
44 |
|
|
esupport &= ~(E_REDEFW|E_RCONST|E_OUTCHAN); |
45 |
|
|
#ifdef BIGGERLIB |
46 |
|
|
biggerlib(); |
47 |
|
|
#endif |
48 |
|
|
varset("PI", ':', 3.14159265358979323846); |
49 |
|
|
|
50 |
|
|
for (i = 1; i < argc; i++) |
51 |
|
|
fcompile(argv[i]); |
52 |
|
|
|
53 |
|
|
setjmp(env); |
54 |
|
|
recover = 1; |
55 |
|
|
eclock++; |
56 |
|
|
|
57 |
|
|
while (fgets(expr, sizeof(expr), stdin) != NULL) { |
58 |
|
|
for (cp = expr; *cp && *cp != '\n'; cp++) |
59 |
|
|
; |
60 |
|
|
*cp = '\0'; |
61 |
|
|
switch (expr[0]) { |
62 |
|
|
case '\0': |
63 |
|
|
continue; |
64 |
|
|
case '?': |
65 |
|
|
for (cp = expr+1; isspace(*cp); cp++) |
66 |
|
|
; |
67 |
|
|
if (*cp) |
68 |
|
|
dprint(cp, stdout); |
69 |
|
|
else |
70 |
|
|
dprint(NULL, stdout); |
71 |
|
|
continue; |
72 |
|
|
case '>': |
73 |
|
|
for (cp = expr+1; isspace(*cp); cp++) |
74 |
|
|
; |
75 |
|
|
if (!*cp) { |
76 |
|
|
eputs("file name required\n"); |
77 |
|
|
continue; |
78 |
|
|
} |
79 |
|
|
if ((fp = fopen(cp, "w")) == NULL) { |
80 |
|
|
eputs(cp); |
81 |
|
|
eputs(": cannot open\n"); |
82 |
|
|
continue; |
83 |
|
|
} |
84 |
|
|
dprint(NULL, fp); |
85 |
|
|
fclose(fp); |
86 |
|
|
continue; |
87 |
|
|
case '<': |
88 |
|
|
for (cp = expr+1; isspace(*cp); cp++) |
89 |
|
|
; |
90 |
|
|
if (!*cp) { |
91 |
|
|
eputs("file name required\n"); |
92 |
|
|
continue; |
93 |
|
|
} |
94 |
|
|
fcompile(cp); |
95 |
|
|
eclock++; |
96 |
|
|
continue; |
97 |
|
|
} |
98 |
|
|
if ((cp = index(expr, '=')) != NULL || |
99 |
|
|
(cp = index(expr, ':')) != NULL) { |
100 |
|
|
if (cp[1]) |
101 |
|
|
scompile(expr, NULL, 0); |
102 |
|
|
else if (*cp == '=') { |
103 |
|
|
*cp = '\0'; |
104 |
|
|
if (!strcmp(expr, "*")) |
105 |
|
|
dcleanup(1); |
106 |
|
|
else |
107 |
|
|
dclear(expr); |
108 |
|
|
} else { |
109 |
|
|
*cp = '\0'; |
110 |
|
|
if (!strcmp(expr, "*")) |
111 |
|
|
dcleanup(2); |
112 |
|
|
else |
113 |
|
|
dremove(expr); |
114 |
|
|
} |
115 |
|
|
eclock++; |
116 |
|
|
} else { |
117 |
|
|
printf("$%d=%.9g\n", nres+1, |
118 |
|
|
result[nres%MAXRES] = eval(expr)); |
119 |
|
|
nres++; |
120 |
|
|
} |
121 |
|
|
} |
122 |
|
|
|
123 |
|
|
recover = 0; |
124 |
|
|
quit(0); |
125 |
|
|
} |
126 |
|
|
|
127 |
|
|
|
128 |
|
|
double |
129 |
|
|
chanvalue(n) /* return channel value */ |
130 |
|
|
int n; |
131 |
|
|
{ |
132 |
|
|
if (n == 0) |
133 |
|
|
n = nres; |
134 |
|
|
else if (n > nres || nres-n >= MAXRES) { |
135 |
|
|
fprintf(stderr, "$%d: illegal result\n", n); |
136 |
|
|
return(0.0); |
137 |
|
|
} |
138 |
|
|
return(result[(n-1)%MAXRES]); |
139 |
|
|
} |
140 |
|
|
|
141 |
|
|
|
142 |
|
|
void |
143 |
|
|
eputs(msg) |
144 |
|
|
char *msg; |
145 |
|
|
{ |
146 |
|
|
fputs(msg, stderr); |
147 |
|
|
} |
148 |
|
|
|
149 |
|
|
|
150 |
|
|
void |
151 |
|
|
wputs(msg) |
152 |
|
|
char *msg; |
153 |
|
|
{ |
154 |
|
|
eputs(msg); |
155 |
|
|
} |
156 |
|
|
|
157 |
|
|
|
158 |
|
|
void |
159 |
|
|
quit(code) |
160 |
|
|
int code; |
161 |
|
|
{ |
162 |
|
|
if (recover) /* a cavalier approach */ |
163 |
|
|
longjmp(env, 1); |
164 |
|
|
exit(code); |
165 |
|
|
} |