1 5cedca1b 2004-05-15 devnull #include <stdio.h>
 2 5cedca1b 2004-05-15 devnull #include <stdlib.h>
 3 5cedca1b 2004-05-15 devnull #include "grap.h"
 4 5cedca1b 2004-05-15 devnull #include "y.tab.h"
 5 5cedca1b 2004-05-15 devnull 
 6 5cedca1b 2004-05-15 devnull typedef struct {
 7 5cedca1b 2004-05-15 devnull 	Obj	*var;	/* index variable */
 8 5cedca1b 2004-05-15 devnull 	double	to;	/* limit */
 9 5cedca1b 2004-05-15 devnull 	double	by;
10 5cedca1b 2004-05-15 devnull 	int	op;	/* operator */
11 5cedca1b 2004-05-15 devnull 	char	*str;	/* string to push back */
12 5cedca1b 2004-05-15 devnull } For;
13 5cedca1b 2004-05-15 devnull 
14 5cedca1b 2004-05-15 devnull #define	MAXFOR	10
15 5cedca1b 2004-05-15 devnull 
16 5cedca1b 2004-05-15 devnull For	forstk[MAXFOR];	/* stack of for loops */
17 5cedca1b 2004-05-15 devnull For	*forp = forstk;	/* pointer to current top */
18 5cedca1b 2004-05-15 devnull 
19 5cedca1b 2004-05-15 devnull void forloop(Obj *var, double from, double to, int op, double by, char *str)	/* set up a for loop */
20 5cedca1b 2004-05-15 devnull {
21 5cedca1b 2004-05-15 devnull 	fprintf(tfd, "# for %s from %g to %g by %c %g \n",
22 5cedca1b 2004-05-15 devnull 		var->name, from, to, op, by);
23 5cedca1b 2004-05-15 devnull 	if (++forp >= forstk+MAXFOR)
24 5cedca1b 2004-05-15 devnull 		ERROR "for loop nested too deep" FATAL;
25 5cedca1b 2004-05-15 devnull 	forp->var = var;
26 5cedca1b 2004-05-15 devnull 	forp->to = to;
27 5cedca1b 2004-05-15 devnull 	forp->op = op;
28 5cedca1b 2004-05-15 devnull 	forp->by = by;
29 5cedca1b 2004-05-15 devnull 	forp->str = str;
30 5cedca1b 2004-05-15 devnull 	setvar(var, from);
31 5cedca1b 2004-05-15 devnull 	nextfor();
32 5cedca1b 2004-05-15 devnull 	unput('\n');
33 5cedca1b 2004-05-15 devnull }
34 5cedca1b 2004-05-15 devnull 
35 5cedca1b 2004-05-15 devnull void nextfor(void)	/* do one iteration of a for loop */
36 5cedca1b 2004-05-15 devnull {
37 5cedca1b 2004-05-15 devnull 	/* BUG:  this should depend on op and direction */
38 5cedca1b 2004-05-15 devnull 	if (forp->var->fval > SLOP * forp->to) {	/* loop is done */
39 5cedca1b 2004-05-15 devnull 		free(forp->str);
40 5cedca1b 2004-05-15 devnull 		if (--forp < forstk)
41 5cedca1b 2004-05-15 devnull 			ERROR "forstk popped too far" FATAL;
42 5cedca1b 2004-05-15 devnull 	} else {		/* another iteration */
43 5cedca1b 2004-05-15 devnull 		pushsrc(String, "\nEndfor\n");
44 5cedca1b 2004-05-15 devnull 		pushsrc(String, forp->str);
45 5cedca1b 2004-05-15 devnull 	}
46 5cedca1b 2004-05-15 devnull }
47 5cedca1b 2004-05-15 devnull 
48 5cedca1b 2004-05-15 devnull void endfor(void)	/* end one iteration of for loop */
49 5cedca1b 2004-05-15 devnull {
50 5cedca1b 2004-05-15 devnull 	switch (forp->op) {
51 5cedca1b 2004-05-15 devnull 	case '+':
52 5cedca1b 2004-05-15 devnull 	case ' ':
53 5cedca1b 2004-05-15 devnull 		forp->var->fval += forp->by;
54 5cedca1b 2004-05-15 devnull 		break;
55 5cedca1b 2004-05-15 devnull 	case '-':
56 5cedca1b 2004-05-15 devnull 		forp->var->fval -= forp->by;
57 5cedca1b 2004-05-15 devnull 		break;
58 5cedca1b 2004-05-15 devnull 	case '*':
59 5cedca1b 2004-05-15 devnull 		forp->var->fval *= forp->by;
60 5cedca1b 2004-05-15 devnull 		break;
61 5cedca1b 2004-05-15 devnull 	case '/':
62 5cedca1b 2004-05-15 devnull 		forp->var->fval /= forp->by;
63 5cedca1b 2004-05-15 devnull 		break;
64 5cedca1b 2004-05-15 devnull 	}
65 5cedca1b 2004-05-15 devnull 	nextfor();
66 5cedca1b 2004-05-15 devnull }
67 5cedca1b 2004-05-15 devnull 
68 5cedca1b 2004-05-15 devnull char *ifstat(double expr, char *thenpart, char *elsepart)
69 5cedca1b 2004-05-15 devnull {
70 5cedca1b 2004-05-15 devnull 	dprintf("if %g then <%s> else <%s>\n", expr, thenpart, elsepart? elsepart : "");
71 5cedca1b 2004-05-15 devnull 	if (expr) {
72 5cedca1b 2004-05-15 devnull 		unput('\n');
73 5cedca1b 2004-05-15 devnull 		pushsrc(Free, thenpart);
74 5cedca1b 2004-05-15 devnull 		pushsrc(String, thenpart);
75 5cedca1b 2004-05-15 devnull 		unput('\n');
76 5cedca1b 2004-05-15 devnull   		if (elsepart)
77 5cedca1b 2004-05-15 devnull 			free(elsepart);
78 5cedca1b 2004-05-15 devnull 		return thenpart;	/* to be freed later */
79 5cedca1b 2004-05-15 devnull 	} else {
80 5cedca1b 2004-05-15 devnull 		free(thenpart);
81 5cedca1b 2004-05-15 devnull 		if (elsepart) {
82 5cedca1b 2004-05-15 devnull 			unput('\n');
83 5cedca1b 2004-05-15 devnull 			pushsrc(Free, elsepart);
84 5cedca1b 2004-05-15 devnull 			pushsrc(String, elsepart);
85 5cedca1b 2004-05-15 devnull 			unput('\n');
86 5cedca1b 2004-05-15 devnull 		}
87 5cedca1b 2004-05-15 devnull 		return elsepart;
88 5cedca1b 2004-05-15 devnull 	}
89 5cedca1b 2004-05-15 devnull }