| 27 |
|
#include "calcomp.h" |
| 28 |
|
|
| 29 |
|
#define MAXLINE 256 /* maximum line length */ |
| 30 |
– |
#define MAXWORD 64 /* maximum word length */ |
| 30 |
|
|
| 31 |
|
#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
| 32 |
|
|
| 34 |
– |
#define isid(c) (isalnum(c) || (c) == '_' || (c) == '.') |
| 35 |
– |
|
| 33 |
|
#define isdecimal(c) (isdigit(c) || (c) == '.') |
| 34 |
|
|
| 35 |
|
extern double atof(), pow(); |
| 323 |
|
} |
| 324 |
|
|
| 325 |
|
|
| 326 |
< |
scan() /* scan next character */ |
| 326 |
> |
int |
| 327 |
> |
scan() /* scan next character, return literal next */ |
| 328 |
|
{ |
| 329 |
+ |
register int lnext = 0; |
| 330 |
+ |
|
| 331 |
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do { |
| 332 |
|
if (linbuf[linepos] == '\0') |
| 333 |
|
if (infp == NULL || fgets(linbuf, MAXLINE, infp) == NULL) |
| 339 |
|
} |
| 340 |
|
else |
| 341 |
|
nextc = linbuf[linepos++]; |
| 342 |
+ |
if (!lnext) |
| 343 |
+ |
lnext = nextc; |
| 344 |
|
if (nextc == '{') { |
| 345 |
|
scan(); |
| 346 |
|
while (nextc != '}') |
| 351 |
|
scan(); |
| 352 |
|
} |
| 353 |
|
} while (isspace(nextc)); |
| 354 |
+ |
return(lnext); |
| 355 |
|
} |
| 356 |
|
|
| 357 |
|
|
| 425 |
|
getname() /* scan an identifier */ |
| 426 |
|
{ |
| 427 |
|
static char str[MAXWORD+1]; |
| 428 |
< |
register int i; |
| 428 |
> |
register int i, lnext; |
| 429 |
|
|
| 430 |
< |
for (i = 0; i < MAXWORD && isid(nextc); i++, scan()) |
| 431 |
< |
str[i] = nextc; |
| 430 |
> |
lnext = nextc; |
| 431 |
> |
for (i = 0; i < MAXWORD && isid(lnext); i++, lnext = scan()) |
| 432 |
> |
str[i] = lnext; |
| 433 |
|
str[i] = '\0'; |
| 434 |
|
|
| 435 |
|
return(str); |
| 439 |
|
int |
| 440 |
|
getinum() /* scan a positive integer */ |
| 441 |
|
{ |
| 442 |
< |
register int n; |
| 442 |
> |
register int n, lnext; |
| 443 |
|
|
| 444 |
|
n = 0; |
| 445 |
< |
while (isdigit(nextc)) { |
| 446 |
< |
n = n * 10 + nextc - '0'; |
| 447 |
< |
scan(); |
| 445 |
> |
lnext = nextc; |
| 446 |
> |
while (isdigit(lnext)) { |
| 447 |
> |
n = n * 10 + lnext - '0'; |
| 448 |
> |
lnext = scan(); |
| 449 |
|
} |
| 450 |
|
return(n); |
| 451 |
|
} |
| 454 |
|
double |
| 455 |
|
getnum() /* scan a positive float */ |
| 456 |
|
{ |
| 457 |
< |
register int i; |
| 457 |
> |
register int i, lnext; |
| 458 |
|
char str[MAXWORD+1]; |
| 459 |
|
|
| 460 |
|
i = 0; |
| 461 |
< |
while (isdigit(nextc) && i < MAXWORD) { |
| 462 |
< |
str[i++] = nextc; |
| 463 |
< |
scan(); |
| 461 |
> |
lnext = nextc; |
| 462 |
> |
while (isdigit(lnext) && i < MAXWORD) { |
| 463 |
> |
str[i++] = lnext; |
| 464 |
> |
lnext = scan(); |
| 465 |
|
} |
| 466 |
< |
if (nextc == '.' && i < MAXWORD) { |
| 467 |
< |
str[i++] = nextc; |
| 468 |
< |
scan(); |
| 469 |
< |
while (isdigit(nextc) && i < MAXWORD) { |
| 470 |
< |
str[i++] = nextc; |
| 471 |
< |
scan(); |
| 466 |
> |
if (lnext == '.' && i < MAXWORD) { |
| 467 |
> |
str[i++] = lnext; |
| 468 |
> |
lnext = scan(); |
| 469 |
> |
while (isdigit(lnext) && i < MAXWORD) { |
| 470 |
> |
str[i++] = lnext; |
| 471 |
> |
lnext = scan(); |
| 472 |
|
} |
| 473 |
|
} |
| 474 |
< |
if ((nextc == 'e' || nextc == 'E') && i < MAXWORD) { |
| 475 |
< |
str[i++] = nextc; |
| 476 |
< |
scan(); |
| 477 |
< |
if ((nextc == '-' || nextc == '+') && i < MAXWORD) { |
| 478 |
< |
str[i++] = nextc; |
| 479 |
< |
scan(); |
| 474 |
> |
if ((lnext == 'e' || lnext == 'E') && i < MAXWORD) { |
| 475 |
> |
str[i++] = lnext; |
| 476 |
> |
lnext = scan(); |
| 477 |
> |
if ((lnext == '-' || lnext == '+') && i < MAXWORD) { |
| 478 |
> |
str[i++] = lnext; |
| 479 |
> |
lnext = scan(); |
| 480 |
|
} |
| 481 |
< |
while (isdigit(nextc) && i < MAXWORD) { |
| 482 |
< |
str[i++] = nextc; |
| 483 |
< |
scan(); |
| 481 |
> |
while (isdigit(lnext) && i < MAXWORD) { |
| 482 |
> |
str[i++] = lnext; |
| 483 |
> |
lnext = scan(); |
| 484 |
|
} |
| 485 |
|
} |
| 486 |
|
str[i] = '\0'; |
