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#ifndef lint
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static const char RCSid[] = "$Id: calc.c,v 1.7 2013/12/19 16:38:12 greg Exp $";
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#endif
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/*
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* calc.c - simple algebraic desk calculator program.
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*
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* 4/1/86
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*/
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#include <stdlib.h>
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#include <setjmp.h>
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#include <ctype.h>
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#include "rtio.h"
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#include "rterror.h"
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#include "calcomp.h"
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#define MAXRES 100
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double result[MAXRES];
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int nres = 0;
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jmp_buf env;
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int recover = 0;
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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char expr[2048];
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char *epos;
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FILE *fp;
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int i;
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char *cp;
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esupport |= E_VARIABLE|E_INCHAN|E_FUNCTION;
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esupport &= ~(E_REDEFW|E_RCONST|E_OUTCHAN);
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#ifdef BIGGERLIB
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biggerlib();
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#endif
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varset("PI", ':', 3.14159265358979323846);
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for (i = 1; i < argc; i++) {
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cp = getpath(argv[i], getrlibpath(), 0);
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if (cp == NULL) {
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eputs(argv[0]);
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eputs(": cannot find file '");
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eputs(argv[i]);
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eputs("'\n");
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quit(1);
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}
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fcompile(cp);
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}
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setjmp(env);
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recover = 1;
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eclock++;
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epos = expr;
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while (fgets(epos, sizeof(expr)-(epos-expr), stdin) != NULL) {
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while (*epos && *epos != '\n')
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epos++;
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if (*epos && epos > expr && epos[-1] == '\\') {
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epos[-1] = ' ';
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continue; /* escaped newline */
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}
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*epos = '\0';
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epos = expr;
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switch (expr[0]) {
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case '\0':
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continue;
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case '?':
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for (cp = expr+1; isspace(*cp); cp++)
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;
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if (*cp)
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dprint(cp, stdout);
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else
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dprint(NULL, stdout);
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continue;
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case '>':
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for (cp = expr+1; isspace(*cp); cp++)
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;
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if (!*cp) {
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eputs("file name required\n");
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continue;
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}
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if ((fp = fopen(cp, "w")) == NULL) {
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eputs(cp);
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eputs(": cannot open\n");
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continue;
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}
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dprint(NULL, fp);
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fclose(fp);
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continue;
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case '<':
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for (cp = expr+1; isspace(*cp); cp++)
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;
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if (!*cp) {
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eputs("file name required\n");
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continue;
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}
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cp = getpath(cp, getrlibpath(), 0);
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if (cp == NULL) {
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eputs("cannot find file\n");
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continue;
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}
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fcompile(cp);
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eclock++;
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continue;
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}
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if ((cp = strchr(expr, '=')) != NULL ||
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(cp = strchr(expr, ':')) != NULL) {
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if (cp[1])
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scompile(expr, NULL, 0);
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else if (*cp == '=') {
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*cp = '\0';
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if (!strcmp(expr, "*"))
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dcleanup(1);
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else
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dclear(expr);
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} else {
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*cp = '\0';
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if (!strcmp(expr, "*"))
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dcleanup(2);
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else
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dremove(expr);
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}
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eclock++;
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} else {
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printf("$%d=%.9g\n", nres+1,
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result[nres%MAXRES] = eval(expr));
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nres++;
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}
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}
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recover = 0;
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quit(0);
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return 0; /* pro forma exit */
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}
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double
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chanvalue(n) /* return channel value */
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int n;
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{
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if (n == 0)
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n = nres;
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else if (n > nres || nres-n >= MAXRES) {
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fprintf(stderr, "$%d: illegal result\n", n);
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return(0.0);
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}
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return(result[(n-1)%MAXRES]);
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}
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void
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eputs(msg)
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char *msg;
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{
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fputs(msg, stderr);
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}
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void
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wputs(msg)
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char *msg;
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{
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eputs(msg);
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}
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void
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quit(code)
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int code;
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{
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if (recover) /* a cavalier approach */
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longjmp(env, 1);
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exit(code);
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}
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