| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: calc.c,v 1.5 2003/11/14 17:31:24 schorsch Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* calc.c - simple algebraic desk calculator program. |
| 6 |
* |
| 7 |
* 4/1/86 |
| 8 |
*/ |
| 9 |
|
| 10 |
#include <stdlib.h> |
| 11 |
#include <stdio.h> |
| 12 |
#include <string.h> |
| 13 |
#include <setjmp.h> |
| 14 |
#include <ctype.h> |
| 15 |
|
| 16 |
#include "rterror.h" |
| 17 |
#include "calcomp.h" |
| 18 |
|
| 19 |
#define MAXRES 100 |
| 20 |
|
| 21 |
double result[MAXRES]; |
| 22 |
int nres = 0; |
| 23 |
|
| 24 |
jmp_buf env; |
| 25 |
int recover = 0; |
| 26 |
|
| 27 |
|
| 28 |
int |
| 29 |
main(argc, argv) |
| 30 |
int argc; |
| 31 |
char *argv[]; |
| 32 |
{ |
| 33 |
char expr[2048]; |
| 34 |
char *epos; |
| 35 |
FILE *fp; |
| 36 |
int i; |
| 37 |
register char *cp; |
| 38 |
|
| 39 |
esupport |= E_VARIABLE|E_INCHAN|E_FUNCTION; |
| 40 |
esupport &= ~(E_REDEFW|E_RCONST|E_OUTCHAN); |
| 41 |
#ifdef BIGGERLIB |
| 42 |
biggerlib(); |
| 43 |
#endif |
| 44 |
varset("PI", ':', 3.14159265358979323846); |
| 45 |
|
| 46 |
for (i = 1; i < argc; i++) |
| 47 |
fcompile(argv[i]); |
| 48 |
|
| 49 |
setjmp(env); |
| 50 |
recover = 1; |
| 51 |
eclock++; |
| 52 |
|
| 53 |
epos = expr; |
| 54 |
while (fgets(epos, sizeof(expr)-(epos-expr), stdin) != NULL) { |
| 55 |
while (*epos && *epos != '\n') |
| 56 |
epos++; |
| 57 |
if (*epos && epos > expr && epos[-1] == '\\') { |
| 58 |
epos[-1] = ' '; |
| 59 |
continue; /* escaped newline */ |
| 60 |
} |
| 61 |
*epos = '\0'; |
| 62 |
epos = expr; |
| 63 |
switch (expr[0]) { |
| 64 |
case '\0': |
| 65 |
continue; |
| 66 |
case '?': |
| 67 |
for (cp = expr+1; isspace(*cp); cp++) |
| 68 |
; |
| 69 |
if (*cp) |
| 70 |
dprint(cp, stdout); |
| 71 |
else |
| 72 |
dprint(NULL, stdout); |
| 73 |
continue; |
| 74 |
case '>': |
| 75 |
for (cp = expr+1; isspace(*cp); cp++) |
| 76 |
; |
| 77 |
if (!*cp) { |
| 78 |
eputs("file name required\n"); |
| 79 |
continue; |
| 80 |
} |
| 81 |
if ((fp = fopen(cp, "w")) == NULL) { |
| 82 |
eputs(cp); |
| 83 |
eputs(": cannot open\n"); |
| 84 |
continue; |
| 85 |
} |
| 86 |
dprint(NULL, fp); |
| 87 |
fclose(fp); |
| 88 |
continue; |
| 89 |
case '<': |
| 90 |
for (cp = expr+1; isspace(*cp); cp++) |
| 91 |
; |
| 92 |
if (!*cp) { |
| 93 |
eputs("file name required\n"); |
| 94 |
continue; |
| 95 |
} |
| 96 |
fcompile(cp); |
| 97 |
eclock++; |
| 98 |
continue; |
| 99 |
} |
| 100 |
if ((cp = strchr(expr, '=')) != NULL || |
| 101 |
(cp = strchr(expr, ':')) != NULL) { |
| 102 |
if (cp[1]) |
| 103 |
scompile(expr, NULL, 0); |
| 104 |
else if (*cp == '=') { |
| 105 |
*cp = '\0'; |
| 106 |
if (!strcmp(expr, "*")) |
| 107 |
dcleanup(1); |
| 108 |
else |
| 109 |
dclear(expr); |
| 110 |
} else { |
| 111 |
*cp = '\0'; |
| 112 |
if (!strcmp(expr, "*")) |
| 113 |
dcleanup(2); |
| 114 |
else |
| 115 |
dremove(expr); |
| 116 |
} |
| 117 |
eclock++; |
| 118 |
} else { |
| 119 |
printf("$%d=%.9g\n", nres+1, |
| 120 |
result[nres%MAXRES] = eval(expr)); |
| 121 |
nres++; |
| 122 |
} |
| 123 |
} |
| 124 |
|
| 125 |
recover = 0; |
| 126 |
quit(0); |
| 127 |
return 0; /* pro forma exit */ |
| 128 |
} |
| 129 |
|
| 130 |
|
| 131 |
double |
| 132 |
chanvalue(n) /* return channel value */ |
| 133 |
int n; |
| 134 |
{ |
| 135 |
if (n == 0) |
| 136 |
n = nres; |
| 137 |
else if (n > nres || nres-n >= MAXRES) { |
| 138 |
fprintf(stderr, "$%d: illegal result\n", n); |
| 139 |
return(0.0); |
| 140 |
} |
| 141 |
return(result[(n-1)%MAXRES]); |
| 142 |
} |
| 143 |
|
| 144 |
|
| 145 |
void |
| 146 |
eputs(msg) |
| 147 |
char *msg; |
| 148 |
{ |
| 149 |
fputs(msg, stderr); |
| 150 |
} |
| 151 |
|
| 152 |
|
| 153 |
void |
| 154 |
wputs(msg) |
| 155 |
char *msg; |
| 156 |
{ |
| 157 |
eputs(msg); |
| 158 |
} |
| 159 |
|
| 160 |
|
| 161 |
void |
| 162 |
quit(code) |
| 163 |
int code; |
| 164 |
{ |
| 165 |
if (recover) /* a cavalier approach */ |
| 166 |
longjmp(env, 1); |
| 167 |
exit(code); |
| 168 |
} |
