| 37 |
|
|
| 38 |
|
#define envalue(ep) ((ep)->type==NUM ? (ep)->v.num : evalue(ep)) |
| 39 |
|
|
| 40 |
< |
static double euminus(EPNODE *), eargument(EPNODE *), enumber(EPNODE *); |
| 40 |
> |
static double euminus(EPNODE *), enumber(EPNODE *); |
| 41 |
|
static double echannel(EPNODE *); |
| 42 |
|
static double eadd(EPNODE *), esubtr(EPNODE *), |
| 43 |
|
emult(EPNODE *), edivi(EPNODE *), |
| 211 |
|
} |
| 212 |
|
|
| 213 |
|
|
| 214 |
< |
void |
| 214 |
> |
static void |
| 215 |
|
epflatten( /* flatten hierarchies for '+', '*' */ |
| 216 |
|
EPNODE *epar |
| 217 |
|
) |
| 218 |
|
{ |
| 219 |
|
EPNODE *ep; |
| 220 |
|
|
| 221 |
< |
if (epar->nkids < 0) /* don't really handle this properly */ |
| 222 |
< |
epar->nkids *= -1; |
| 221 |
> |
if (epar->nkids < 0) /* can't handle array allocations */ |
| 222 |
> |
return; |
| 223 |
|
|
| 224 |
|
for (ep = epar->v.kid; ep != NULL; ep = ep->sibling) |
| 225 |
< |
while (ep->type == epar->type) { |
| 225 |
> |
while (ep->type == epar->type && ep->nkids > 0) { |
| 226 |
|
EPNODE *ep1 = ep->v.kid; |
| 227 |
|
while (ep1->sibling != NULL) |
| 228 |
|
ep1 = ep1->sibling; |
| 229 |
|
ep1->sibling = ep->sibling; |
| 230 |
< |
epar->nkids += nekids(ep) - 1; |
| 230 |
> |
epar->nkids += ep->nkids - 1; |
| 231 |
|
ep1 = ep->v.kid; |
| 232 |
|
*ep = *ep1; |
| 233 |
|
efree(ep1); /* not epfree()! */ |
| 236 |
|
|
| 237 |
|
|
| 238 |
|
void |
| 239 |
< |
epoptimize( /* flatten operations and lists -> arrays */ |
| 239 |
> |
epoptimize( /* flatten operations, lists -> arrays */ |
| 240 |
|
EPNODE *epar |
| 241 |
|
) |
| 242 |
|
{ |
| 243 |
|
EPNODE *ep; |
| 244 |
|
|
| 245 |
< |
if ((epar->type == '+') | (epar->type == '*')) |
| 246 |
< |
epflatten(epar); /* commutative & associative */ |
| 245 |
> |
if ((epar->type == '+') | (epar->type == '*')) |
| 246 |
> |
epflatten(epar); /* flatten associative operations */ |
| 247 |
|
|
| 248 |
< |
if (epar->nkids) /* do children if any */ |
| 248 |
> |
if (epar->nkids) /* do children if any */ |
| 249 |
|
for (ep = epar->v.kid; ep != NULL; ep = ep->sibling) |
| 250 |
|
epoptimize(ep); |
| 251 |
|
|
| 266 |
|
|
| 267 |
|
/* the following used to be a switch */ |
| 268 |
|
static double |
| 269 |
– |
eargument( |
| 270 |
– |
EPNODE *ep |
| 271 |
– |
) |
| 272 |
– |
{ |
| 273 |
– |
return(argument(ep->v.chan)); |
| 274 |
– |
} |
| 275 |
– |
|
| 276 |
– |
static double |
| 269 |
|
enumber( |
| 270 |
|
EPNODE *ep |
| 271 |
|
) |
| 338 |
|
) |
| 339 |
|
{ |
| 340 |
|
EPNODE *ep1 = ep->v.kid; |
| 341 |
< |
EPNODE *ep2 = ep1->sibling; |
| 350 |
< |
double d; |
| 341 |
> |
double den = evalue(ep1->sibling); |
| 342 |
|
|
| 343 |
< |
d = envalue(ep2); |
| 353 |
< |
if (d == 0.0) { |
| 343 |
> |
if (den == 0.0) { |
| 344 |
|
wputs("Division by zero\n"); |
| 345 |
|
errno = ERANGE; |
| 346 |
|
return(0.0); |
| 347 |
|
} |
| 348 |
< |
return(envalue(ep1) / d); |
| 348 |
> |
return(envalue(ep1) / den); |
| 349 |
|
} |
| 350 |
|
|
| 351 |
|
static double |
| 552 |
|
EPNODE *ek |
| 553 |
|
) |
| 554 |
|
{ |
| 555 |
< |
if (ep->nkids < 0) /* we don't really handle this properly */ |
| 556 |
< |
ep->nkids *= -1; |
| 555 |
> |
if (ep->nkids < 0) { |
| 556 |
> |
eputs("Cannot add kid to EPNODE array\n"); |
| 557 |
> |
quit(1); |
| 558 |
> |
} |
| 559 |
|
ep->nkids++; |
| 560 |
|
if (ep->v.kid == NULL) |
| 561 |
|
ep->v.kid = ek; |
