9 char *var; /* index variable */
10 double to; /* limit */
12 int op; /* operator */
13 char *str; /* string to push back */
16 For forstk[10]; /* stack of for loops */
17 For *forp = forstk; /* pointer to current top */
19 void setfval(char *, double);
22 void forloop(char *var, double from, double to, int op,
23 double by, char *str) /* set up a for loop */
25 dprintf("# for %s from %g to %g by %c %g \n",
26 var, from, to, op, by);
27 if (++forp >= forstk+10)
28 ERROR "for loop nested too deep" FATAL;
39 void nextfor(void) /* do one iteration of a for loop */
41 /* BUG: this should depend on op and direction */
42 if (getfval(forp->var) > SLOP * forp->to) { /* loop is done */
45 ERROR "forstk popped too far" FATAL;
46 } else { /* another iteration */
47 pushsrc(String, "\nEndfor\n");
48 pushsrc(String, forp->str);
52 void endfor(void) /* end one iteration of for loop */
54 struct symtab *p = lookup(forp->var);
59 p->s_val.f += forp->by;
62 p->s_val.f -= forp->by;
65 p->s_val.f *= forp->by;
68 p->s_val.f /= forp->by;
74 char *ifstat(double expr, char *thenpart, char *elsepart)
76 dprintf("if %g then <%s> else <%s>\n", expr, thenpart, elsepart? elsepart : "");
79 pushsrc(Free, thenpart);
80 pushsrc(String, thenpart);
84 return thenpart; /* to be freed later */
89 pushsrc(Free, elsepart);
90 pushsrc(String, elsepart);