src/cal/calc.c

#ifndef lint
static const char       RCSid[] = "$Id: calc.c,v 1.5 2003/11/14 17:31:24 schorsch Exp $";
#endif
/*
 *  calc.c - simple algebraic desk calculator program.
 *
 *     4/1/86
 */

#include  <stdlib.h>
#include  <stdio.h>
#include  <string.h>
#include  <setjmp.h>
#include  <ctype.h>

#include  "rterror.h"
#include  "calcomp.h"

#define  MAXRES         100

double  result[MAXRES];
int     nres = 0;

jmp_buf  env;
int  recover = 0;


int
main(argc, argv)
int  argc;
char  *argv[];
{
        char  expr[2048];
        char  *epos;
        FILE  *fp;
        int  i;
        register char  *cp;

        esupport |= E_VARIABLE|E_INCHAN|E_FUNCTION;
        esupport &= ~(E_REDEFW|E_RCONST|E_OUTCHAN);
#ifdef  BIGGERLIB
        biggerlib();
#endif
        varset("PI", ':', 3.14159265358979323846);

        for (i = 1; i < argc; i++)
                fcompile(argv[i]);

        setjmp(env);
        recover = 1;
        eclock++;

        epos = expr;
        while (fgets(epos, sizeof(expr)-(epos-expr), stdin) != NULL) {
                while (*epos && *epos != '\n')
                        epos++;
                if (*epos && epos > expr && epos[-1] == '\\') {
                        epos[-1] = ' ';
                        continue;               /* escaped newline */
                }
                *epos = '\0';
                epos = expr;
                switch (expr[0]) {
                case '\0':
                        continue;
                case '?':
                        for (cp = expr+1; isspace(*cp); cp++)
                                ;
                        if (*cp)
                                dprint(cp, stdout);
                        else
                                dprint(NULL, stdout);
                        continue;
                case '>':
                        for (cp = expr+1; isspace(*cp); cp++)
                                ;
                        if (!*cp) {
                                eputs("file name required\n");
                                continue;
                        }
                        if ((fp = fopen(cp, "w")) == NULL) {
                                eputs(cp);
                                eputs(": cannot open\n");
                                continue;
                        }
                        dprint(NULL, fp);
                        fclose(fp);
                        continue;
                case '<':
                        for (cp = expr+1; isspace(*cp); cp++)
                                ;
                        if (!*cp) {
                                eputs("file name required\n");
                                continue;
                        }
                        fcompile(cp);
                        eclock++;
                        continue;
                }
                if ((cp = strchr(expr, '=')) != NULL ||
                                (cp = strchr(expr, ':')) != NULL) {
                        if (cp[1])
                                scompile(expr, NULL, 0);
                        else if (*cp == '=') {
                                *cp = '\0';
                                if (!strcmp(expr, "*"))
                                        dcleanup(1);
                                else
                                        dclear(expr);
                        } else {
                                *cp = '\0';
                                if (!strcmp(expr, "*"))
                                        dcleanup(2);
                                else
                                        dremove(expr);
                        }
                        eclock++;
                } else {
                        printf("$%d=%.9g\n", nres+1,
                                        result[nres%MAXRES] = eval(expr));
                        nres++;
                }
        }

        recover = 0;
        quit(0);
        return 0; /* pro forma exit */
}


double
chanvalue(n)                    /* return channel value */
int  n;
{
        if (n == 0)
                n = nres;
        else if (n > nres || nres-n >= MAXRES) {
                fprintf(stderr, "$%d: illegal result\n", n);
                return(0.0);
        }
        return(result[(n-1)%MAXRES]);
}


void
eputs(msg)
char  *msg;
{
        fputs(msg, stderr);
}


void
wputs(msg)
char  *msg;
{
        eputs(msg);
}


void
quit(code)
int  code;
{
        if (recover)                    /* a cavalier approach */
                longjmp(env, 1);
        exit(code);
}
Revision:	1.6
Committed:	Tue Dec 9 15:55:46 2003 UTC (21 years, 10 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad3R7P2, rad3R7P1, rad4R1, rad4R0, rad3R6, rad3R6P1, rad3R8, rad3R9
Changes since 1.5:	+13 -6 lines
Log Message:	Added ability for calc to read on a continued line
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	1.6	static const char RCSid[] = "$Id: calc.c,v 1.5 2003/11/14 17:31:24 schorsch Exp $";
3	greg	1.1	#endif
4			/*
5			* calc.c - simple algebraic desk calculator program.
6			*
7			* 4/1/86
8			*/
9
10	schorsch	1.2	#include <stdlib.h>
11	greg	1.1	#include <stdio.h>
12	schorsch	1.2	#include <string.h>
13	greg	1.1	#include <setjmp.h>
14			#include <ctype.h>
15
16	schorsch	1.4	#include "rterror.h"
17	greg	1.1	#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	schorsch	1.5	int
29	greg	1.1	main(argc, argv)
30			int argc;
31			char *argv[];
32			{
33	greg	1.6	char expr[2048];
34			char *epos;
35	greg	1.1	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	greg	1.6	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	greg	1.1	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	schorsch	1.3	if ((cp = strchr(expr, '=')) != NULL \|\|
101			(cp = strchr(expr, ':')) != NULL) {
102	greg	1.1	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	schorsch	1.5	return 0; /* pro forma exit */
128	greg	1.1	}
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			}