Cell *execute(Node *u) /* execute a node of the parse tree */ { Cell *(*proc)(Node **, int); Cell *x; Node *a; if (u == NULL) return(True); for (a = u; ; a = a->nnext) { curnode = a; if (isvalue(a)) { x = (Cell *) (a->narg[0]); if (isfld(x) && !donefld) fldbld(); else if (isrec(x) && !donerec) recbld(); return(x); } if (notlegal(a->nobj)) /* probably a Cell* but too risky to print */ FATAL("illegal statement"); proc = proctab[a->nobj-FIRSTTOKEN]; x = (*proc)(a->narg, a->nobj); if (isfld(x) && !donefld) fldbld(); else if (isrec(x) && !donerec) recbld(); if (isexpr(a)) return(x); if (isjump(x)) return(x); if (a->nnext == NULL) return(x); tempfree(x); } }
static char *get_str_val(Cell *vp, char **fmt) /* get string val of a Cell */ { char s[100]; /* BUG: unchecked */ double dtemp; if ((vp->tval & (NUM | STR)) == 0) funnyvar(vp, "read value of"); if (isfld(vp) && donefld == 0) fldbld(); else if (isrec(vp) && donerec == 0) recbld(); if (isstr(vp) == 0) { if (freeable(vp)) xfree(vp->sval); if (modf(vp->fval, &dtemp) == 0) /* it's integral */ sprintf(s, "%.30g", vp->fval); else sprintf(s, *fmt, vp->fval); vp->sval = tostring(s); vp->tval &= ~DONTFREE; vp->tval |= STR; } dprintf( ("getsval %p: %s = \"%s (%p)\", t=%o\n", (void*)vp, NN(vp->nval), vp->sval, vp->sval, vp->tval) ); return(vp->sval); }
char *setsval(Cell *vp, const char *s) /* set string val of a Cell */ { char *t; int fldno; dprintf( ("starting setsval %p: %s = \"%s\", t=%o, r,f=%d,%d\n", (void*)vp, NN(vp->nval), s, vp->tval, donerec, donefld) ); if ((vp->tval & (NUM | STR)) == 0) funnyvar(vp, "assign to"); if (isfld(vp)) { donerec = 0; /* mark $0 invalid */ fldno = atoi(vp->nval); if (fldno > *NF) newfld(fldno); dprintf( ("setting field %d to %s (%p)\n", fldno, s, s) ); } else if (isrec(vp)) { donefld = 0; /* mark $1... invalid */ donerec = 1; } t = tostring(s); /* in case it's self-assign */ if (freeable(vp)) xfree(vp->sval); vp->tval &= ~NUM; vp->tval |= STR; vp->tval &= ~DONTFREE; dprintf( ("setsval %p: %s = \"%s (%p) \", t=%o r,f=%d,%d\n", (void*)vp, NN(vp->nval), t,t, vp->tval, donerec, donefld) ); return(vp->sval = t); }
Awkfloat setfval(Cell *vp, Awkfloat f) /* set float val of a Cell */ { int fldno; if ((vp->tval & (NUM | STR)) == 0) funnyvar(vp, "assign to"); if (isfld(vp)) { donerec = 0; /* mark $0 invalid */ fldno = atoi(vp->nval); if (fldno > *NF) newfld(fldno); dprintf( ("setting field %d to %g\n", fldno, f) ); } else if (isrec(vp)) { donefld = 0; /* mark $1... invalid */ donerec = 1; } if (freeable(vp)) xfree(vp->sval); /* free any previous string */ vp->tval &= ~STR; /* mark string invalid */ vp->tval |= NUM; /* mark number ok */ if (f == -0) /* who would have thought this possible? */ f = 0; dprintf( ("setfval %p: %s = %g, t=%o\n", (void*)vp, NN(vp->nval), f, vp->tval) ); return vp->fval = f; }
Awkfloat setfval(Cell *vp, Awkfloat f) /* set float val of a Cell */ { int fldno; f += 0.0; /* normalise negative zero to positive zero */ if ((vp->tval & (NUM | STR)) == 0) funnyvar(vp, "assign to"); if (isfld(vp)) { donerec = 0; /* mark $0 invalid */ fldno = atoi(vp->nval); if (fldno > *NF) newfld(fldno); dprintf( ("setting field %d to %g\n", fldno, f) ); } else if (&vp->fval == NF) { donerec = 0; /* mark $0 invalid */ setlastfld(f); dprintf( ("setting NF to %g\n", f) ); } else if (isrec(vp)) { donefld = 0; /* mark $1... invalid */ donerec = 1; } if (freeable(vp)) xfree(vp->sval); /* free any previous string */ vp->tval &= ~STR; /* mark string invalid */ vp->tval |= NUM; /* mark number ok */ dprintf( ("setfval %p: %s = %g, t=%o\n", vp, NN(vp->nval), f, vp->tval) ); return vp->fval = f; }
Awkfloat getfval(Cell *vp) /* get float val of a Cell */ { if ((vp->tval & (NUM | STR)) == 0) funnyvar(vp, "read value of"); if (isfld(vp) && donefld == 0) fldbld(); else if (isrec(vp) && donerec == 0) recbld(); if (!isnum(vp)) { /* not a number */ vp->fval = atof(vp->sval); /* best guess */ if (is_number(vp->sval) && !(vp->tval&CON)) vp->tval |= NUM; /* make NUM only sparingly */ } dprintf( ("getfval %p: %s = %g, t=%o\n", vp, NN(vp->nval), vp->fval, vp->tval) ); return(vp->fval); }